1. The document discusses different types of measuring instruments including electrical, electronic, and mechanical instruments.
2. Measuring instruments are further classified based on their operating principles, including their deflecting, controlling, and damping systems.
3. Common examples of electrical measuring instruments are ammeters, voltmeters, and wattmeters which measure current, voltage, and power respectively. These instruments work using principles like magnetic, electromagnetic induction, and thermal effects.
1) DC generators convert mechanical energy to electrical energy through Faraday's law of electromagnetic induction. When a conductor moves through a magnetic field, an EMF is induced in the conductor.
2) The main components of a DC generator are the yoke, field electromagnets, armature, commutator, and brushes. The armature is wound with coils and rotates within the magnetic field produced by the field electromagnets to generate an EMF.
3) As the armature rotates, the commutator and brushes are used to periodically reverse the direction of current in the external circuit, thereby producing direct current. Losses in the generator arise from copper, iron, and mechanical components
The document describes the construction, working, and usage of a permanent magnet moving coil (PMMC) meter. A PMMC meter works based on the D'Arsonval principle where a current carrying coil experiences a force when placed in a magnetic field, causing it to move. When built according to the instructions, the PMMC meter can be used to measure current by connecting it in series in a circuit. The meter has advantages like high accuracy but is only suitable for DC measurements.
An induction energy meter measures electrical energy consumption over time using the principle of electromagnetic induction. It consists of a driving system that induces eddy currents in a rotating aluminum disk via voltage and current coils, a braking system that regulates the disk's speed, and a registering system that counts disk rotations to display energy used in kilowatt-hours. Potential errors from speed, phase, friction, creep, or temperature can be corrected by adjusting magnetic fields or components.
This document discusses AC and DC tachogenerators. It explains that tachogenerators use the principle that relative motion between a magnetic field and a conductor generates a voltage in the conductor. There are two main types - AC and DC tachogenerators. The document describes the construction of each type, how they operate to generate a voltage proportional to rotational speed, and their advantages and disadvantages. It provides details on components like the armature, magnet, coil, rectifier bridge, and moving coil voltmeter used to measure the output voltage and rotational speed.
UNIT–I: MEASURING INSTRUMENTS
Classification – Deflecting, control and damping torques – Ammeters and Voltmeters –PMMC, MI type, dynamometer and electrostatic instruments – Expression for the deflecting torque and control torque – Errors and compensations– Extension of range using shunts and series resistance –CT and PT: Ratio and phase angle errors – Numerical problems.
This document discusses synchros, which are electromechanical devices that produce an output voltage based on the angular position of the rotor rather than the rotor speed. There are four basic types: transmitters, receivers, transformers, and differentials. Transmitters convert mechanical rotation into electrical signals, with the voltage induced in the stator coils depending on the rotor angle. Receivers operate in reverse, using applied voltages to cause the rotor to align with the stator field. Differentials can measure the speed difference between a transmitter and receiver. The document provides examples and diagrams to illustrate the voltage relationships and functions of the different synchro components.
O.C & S.C Test, Sumpner or back to back Test, Condition for maximum efficienc...Abhishek Choksi
Sub: DC Machines and Transformer (2130904)
Active Learning Assignment
Topic: O.C & S.C Test, Sumpner or back to back Test, Condition for maximum efficiency, All day Efficiency
1) DC generators convert mechanical energy to electrical energy through Faraday's law of electromagnetic induction. When a conductor moves through a magnetic field, an EMF is induced in the conductor.
2) The main components of a DC generator are the yoke, field electromagnets, armature, commutator, and brushes. The armature is wound with coils and rotates within the magnetic field produced by the field electromagnets to generate an EMF.
3) As the armature rotates, the commutator and brushes are used to periodically reverse the direction of current in the external circuit, thereby producing direct current. Losses in the generator arise from copper, iron, and mechanical components
The document describes the construction, working, and usage of a permanent magnet moving coil (PMMC) meter. A PMMC meter works based on the D'Arsonval principle where a current carrying coil experiences a force when placed in a magnetic field, causing it to move. When built according to the instructions, the PMMC meter can be used to measure current by connecting it in series in a circuit. The meter has advantages like high accuracy but is only suitable for DC measurements.
An induction energy meter measures electrical energy consumption over time using the principle of electromagnetic induction. It consists of a driving system that induces eddy currents in a rotating aluminum disk via voltage and current coils, a braking system that regulates the disk's speed, and a registering system that counts disk rotations to display energy used in kilowatt-hours. Potential errors from speed, phase, friction, creep, or temperature can be corrected by adjusting magnetic fields or components.
This document discusses AC and DC tachogenerators. It explains that tachogenerators use the principle that relative motion between a magnetic field and a conductor generates a voltage in the conductor. There are two main types - AC and DC tachogenerators. The document describes the construction of each type, how they operate to generate a voltage proportional to rotational speed, and their advantages and disadvantages. It provides details on components like the armature, magnet, coil, rectifier bridge, and moving coil voltmeter used to measure the output voltage and rotational speed.
UNIT–I: MEASURING INSTRUMENTS
Classification – Deflecting, control and damping torques – Ammeters and Voltmeters –PMMC, MI type, dynamometer and electrostatic instruments – Expression for the deflecting torque and control torque – Errors and compensations– Extension of range using shunts and series resistance –CT and PT: Ratio and phase angle errors – Numerical problems.
This document discusses synchros, which are electromechanical devices that produce an output voltage based on the angular position of the rotor rather than the rotor speed. There are four basic types: transmitters, receivers, transformers, and differentials. Transmitters convert mechanical rotation into electrical signals, with the voltage induced in the stator coils depending on the rotor angle. Receivers operate in reverse, using applied voltages to cause the rotor to align with the stator field. Differentials can measure the speed difference between a transmitter and receiver. The document provides examples and diagrams to illustrate the voltage relationships and functions of the different synchro components.
O.C & S.C Test, Sumpner or back to back Test, Condition for maximum efficienc...Abhishek Choksi
Sub: DC Machines and Transformer (2130904)
Active Learning Assignment
Topic: O.C & S.C Test, Sumpner or back to back Test, Condition for maximum efficiency, All day Efficiency
This document provides an overview of electrical measurement and measuring instruments. It discusses the essential requirements of indicating instruments, which are deflecting torque, controlling torque, and damping torque. Controlling torque methods include spring control and gravity control. Damping torque is achieved through air friction or eddy current damping. Moving iron, permanent magnet moving coil, and electrodynamic instruments are described in terms of their construction and working principles. DC ammeters and voltmeters are also briefly discussed.
An alternator is an electrical generator that converts mechanical energy to electrical energy. It uses a rotating magnetic field with a stationary armature. The working principle relies on Faraday's law of electromagnetic induction. As the armature rotates within the magnetic field, an alternating current is produced. The main components are the stator with stationary armature windings and the rotor with a rotating magnetic field supplied by a DC current. Armature reaction causes the magnetic field to be distorted by the armature current. Alternators have various applications including in automobiles, power plants, and for providing regenerative braking in induction motors. Induction generators can also be used to convert the rotational energy of windmills into electrical energy.
This document discusses various methods for controlling the speed of DC motors, including shunt motors and series motors. It provides the governing equations for DC motor speed in terms of flux and back EMF. For shunt motors, it describes flux control, armature control, and voltage control methods. Flux control varies field current, armature control adds resistance in the armature circuit, and voltage control varies the applied voltage. For series motors, it discusses flux control using field and armature divertors, tapped fields, parallel fields, and adding variable resistance in the armature circuit. The document also briefly describes Ward-Leonard speed control systems.
The document discusses tachogenerators, which are devices that measure the speed of a rotating shaft by converting angular velocity into a voltage. There are two main types: DC tachogenerators, which generate a DC voltage corresponding to speed, and AC tachogenerators, which generate an AC voltage that must be rectified. Both work by inducing an electromotive force in a conductor based on its motion through a magnetic field, per Faraday's law of induction. Tachogenerators are used to measure speeds of electric motors, engines, and powered equipment.
The document discusses the Sumpner's test, which is used to test large power transformers without actual loading. It has the following key points:
1. The Sumpner's test connects two identical transformers back to back, with their primaries in parallel and secondaries in series opposition, allowing them to be tested at full load conditions while only supplying power for losses.
2. This configuration causes the induced voltages in the secondaries to oppose each other, resulting in no net current flow between them. An auxiliary transformer is used to induce current and measure copper losses.
3. The test accurately determines total losses as they would occur in actual use, allowing efficiency and regulation to be found without full loading.
This article discusses different power electronics devices that are in use like power diodes, power thyristors, power transistors, IGBT, GTO, IGCT and others. This article will give a basic view of these devices and their operations.
1. A DC motor runs on direct current electricity. It has a field winding that produces a magnetic field when energized, and an armature winding that rotates when placed in this magnetic field.
2. The key parts of a DC motor include the yoke, poles, field winding, armature core, armature winding, commutator, and brushes. The field winding produces flux, and the rotation of the armature winding within this flux induces voltage that is used to power the load.
3. DC motors can be shunt wound, series wound, or compound wound depending on how the field and armature windings are connected. Shunt and series motors have different torque-speed characteristics due
DC to DC converters, also known as choppers, are used to obtain a variable DC output voltage from a constant DC source. They offer benefits like greater efficiency, faster response, smaller size, and smooth control. Choppers control the output voltage through either pulse width modulation, keeping the frequency constant and varying the ON time, or variable frequency control. The document then describes various chopper circuits like buck, boost, and buck-boost converters. It also explains different types of choppers - Types A to E - which operate in the first, second, third or fourth quadrants depending on whether the average output voltage and current are positive or negative.
- A DC motor converts electrical energy into mechanical energy through electromagnetic principles. It has a rotor that rotates when current passes through the motor's armature winding within a magnetic field.
- The key components of a DC motor are the armature winding, field winding, commutator, and brushes. The field winding generates a magnetic field and the armature winding cuts this field to produce torque when powered.
- DC motors can be shunt wound, series wound, or compound wound depending on how the field winding is connected in relation to the armature winding. This determines the speed and torque characteristics of the motor.
In this presentation, i have explain the role of instruments, its working principle with suitable examples.
its application and how a student can learn more about instruments.
Representation of short & medium transmission linesvishalgohel12195
This document discusses the classification and modeling of overhead transmission lines. It notes that short transmission lines only consider resistance and inductance due to their lower voltages and distances. Medium and long transmission lines must account for capacitance effects. The document presents models for short lines using lumped resistance and inductance and models for medium lines using end condenser, nominal T, and nominal π methods which lump the distributed capacitance for simplified analysis. It also discusses voltage regulation and transmission efficiency calculations.
This document provides an overview of power electronics topics including semiconductor devices, controlled rectifiers, DC choppers, inverters, and AC choppers. It discusses various semiconductor devices used in power electronics like power diodes, transistors, BJTs, MOSFETs, IGBTs, SITs, thyristors, SCRs, TRIACs, and GTOs. It covers the structures, characteristics, and applications of these devices. It also compares different semiconductor devices and discusses switching and safe operating areas.
1. Indicating instruments measure electrical quantities by deflecting a pointer on a calibrated scale. They use a deflection system to produce a force proportional to the measured value, a control system to limit deflection, and a damping system to prevent oscillations.
2. Permanent magnet moving coil (PMMC) instruments have a coil mounted between magnet poles that deflects proportional to current. They are used as ammeters, voltmeters, and galvanometers. As an ammeter, the coil is connected across a low resistance shunt; as a voltmeter, it is connected in series with a high resistance.
3. Moving iron instruments can measure AC using an iron core acted on by a coil
This document discusses different types of megger devices, their uses, and operating principles. It describes a megger as a measuring device used for ground earth testing and insulation testing to determine leakage current and insulation levels. There are two main types: electronic meggers that are battery-operated and have digital displays, and manual meggers that are hand-operated with analog displays. The document also mentions it will cover the construction and working principles of meggers, which use hand cranking or batteries to produce test voltages that are applied to electrical systems to measure insulation.
The document discusses various types of electrical measuring instruments. It describes indicating instruments which have a moving pointer system to directly indicate the measured quantity. The essential components of indicating instruments are the deflecting, controlling, and damping systems. Permanent magnet moving coil instruments are discussed as the most accurate for DC measurements. Moving iron instruments that can be used for both AC and DC are also summarized, including attraction and repulsion types. Sources of error in various instruments are outlined.
1. The document describes magnetic circuits and electromagnetic induction. It defines key terms related to magnetism such as magnetic flux, magnetic field, hysteresis, reluctance, and permeability.
2. The document explains different types of magnetic circuits including simple, composite, and parallel circuits. It also discusses magnetic leakage.
3. Electromagnetic induction is described according to Faraday's law and Lenz's law. Dynamically and statically induced emfs are defined and examples of each are provided.
1) There are several types of losses that reduce the efficiency of DC machines, including electrical or copper losses, core losses, brush losses, mechanical losses, and stray load losses.
2) Electrical losses include losses from the armature winding resistance, shunt field winding resistance, series field winding resistance, and interpole winding resistance.
3) Core losses are hysteresis and eddy current losses and account for around 20% of full load losses.
4) Brush losses are due to the voltage drop and current at the brush contact with the commutator.
A transformer consists of two coils with a mutual magnetic field that allows it to convert alternating current of one voltage to another without changing frequency. It works on the principle of electromagnetic induction between the primary and secondary windings. There are several types of losses that occur in transformers like copper, eddy current, and hysteresis losses. The ratio of voltages out to voltages in depends on the turns ratio of the number of windings in the primary coil to the secondary coil. Transformers can either step up or step down voltages and are used widely in power transmission and applications requiring different voltages.
This document discusses different types of electrical and electronic instruments used for measurement and instrumentation. It describes mechanical, electrical, and electronic instruments. Mechanical instruments measure physical quantities under static conditions, while electronic instruments have a quicker response time than mechanical and electrical instruments. Electrical instruments measure electrical quantities like current, voltage, and power. Instruments can also be categorized as absolute, secondary, digital, analog, indicating, integrating, and recording based on their measurement methodology and output display.
This document provides an overview of electrical measurement and measuring instruments. It discusses the essential requirements of indicating instruments, which are deflecting torque, controlling torque, and damping torque. Controlling torque methods include spring control and gravity control. Damping torque is achieved through air friction or eddy current damping. Moving iron, permanent magnet moving coil, and electrodynamic instruments are described in terms of their construction and working principles. DC ammeters and voltmeters are also briefly discussed.
An alternator is an electrical generator that converts mechanical energy to electrical energy. It uses a rotating magnetic field with a stationary armature. The working principle relies on Faraday's law of electromagnetic induction. As the armature rotates within the magnetic field, an alternating current is produced. The main components are the stator with stationary armature windings and the rotor with a rotating magnetic field supplied by a DC current. Armature reaction causes the magnetic field to be distorted by the armature current. Alternators have various applications including in automobiles, power plants, and for providing regenerative braking in induction motors. Induction generators can also be used to convert the rotational energy of windmills into electrical energy.
This document discusses various methods for controlling the speed of DC motors, including shunt motors and series motors. It provides the governing equations for DC motor speed in terms of flux and back EMF. For shunt motors, it describes flux control, armature control, and voltage control methods. Flux control varies field current, armature control adds resistance in the armature circuit, and voltage control varies the applied voltage. For series motors, it discusses flux control using field and armature divertors, tapped fields, parallel fields, and adding variable resistance in the armature circuit. The document also briefly describes Ward-Leonard speed control systems.
The document discusses tachogenerators, which are devices that measure the speed of a rotating shaft by converting angular velocity into a voltage. There are two main types: DC tachogenerators, which generate a DC voltage corresponding to speed, and AC tachogenerators, which generate an AC voltage that must be rectified. Both work by inducing an electromotive force in a conductor based on its motion through a magnetic field, per Faraday's law of induction. Tachogenerators are used to measure speeds of electric motors, engines, and powered equipment.
The document discusses the Sumpner's test, which is used to test large power transformers without actual loading. It has the following key points:
1. The Sumpner's test connects two identical transformers back to back, with their primaries in parallel and secondaries in series opposition, allowing them to be tested at full load conditions while only supplying power for losses.
2. This configuration causes the induced voltages in the secondaries to oppose each other, resulting in no net current flow between them. An auxiliary transformer is used to induce current and measure copper losses.
3. The test accurately determines total losses as they would occur in actual use, allowing efficiency and regulation to be found without full loading.
This article discusses different power electronics devices that are in use like power diodes, power thyristors, power transistors, IGBT, GTO, IGCT and others. This article will give a basic view of these devices and their operations.
1. A DC motor runs on direct current electricity. It has a field winding that produces a magnetic field when energized, and an armature winding that rotates when placed in this magnetic field.
2. The key parts of a DC motor include the yoke, poles, field winding, armature core, armature winding, commutator, and brushes. The field winding produces flux, and the rotation of the armature winding within this flux induces voltage that is used to power the load.
3. DC motors can be shunt wound, series wound, or compound wound depending on how the field and armature windings are connected. Shunt and series motors have different torque-speed characteristics due
DC to DC converters, also known as choppers, are used to obtain a variable DC output voltage from a constant DC source. They offer benefits like greater efficiency, faster response, smaller size, and smooth control. Choppers control the output voltage through either pulse width modulation, keeping the frequency constant and varying the ON time, or variable frequency control. The document then describes various chopper circuits like buck, boost, and buck-boost converters. It also explains different types of choppers - Types A to E - which operate in the first, second, third or fourth quadrants depending on whether the average output voltage and current are positive or negative.
- A DC motor converts electrical energy into mechanical energy through electromagnetic principles. It has a rotor that rotates when current passes through the motor's armature winding within a magnetic field.
- The key components of a DC motor are the armature winding, field winding, commutator, and brushes. The field winding generates a magnetic field and the armature winding cuts this field to produce torque when powered.
- DC motors can be shunt wound, series wound, or compound wound depending on how the field winding is connected in relation to the armature winding. This determines the speed and torque characteristics of the motor.
In this presentation, i have explain the role of instruments, its working principle with suitable examples.
its application and how a student can learn more about instruments.
Representation of short & medium transmission linesvishalgohel12195
This document discusses the classification and modeling of overhead transmission lines. It notes that short transmission lines only consider resistance and inductance due to their lower voltages and distances. Medium and long transmission lines must account for capacitance effects. The document presents models for short lines using lumped resistance and inductance and models for medium lines using end condenser, nominal T, and nominal π methods which lump the distributed capacitance for simplified analysis. It also discusses voltage regulation and transmission efficiency calculations.
This document provides an overview of power electronics topics including semiconductor devices, controlled rectifiers, DC choppers, inverters, and AC choppers. It discusses various semiconductor devices used in power electronics like power diodes, transistors, BJTs, MOSFETs, IGBTs, SITs, thyristors, SCRs, TRIACs, and GTOs. It covers the structures, characteristics, and applications of these devices. It also compares different semiconductor devices and discusses switching and safe operating areas.
1. Indicating instruments measure electrical quantities by deflecting a pointer on a calibrated scale. They use a deflection system to produce a force proportional to the measured value, a control system to limit deflection, and a damping system to prevent oscillations.
2. Permanent magnet moving coil (PMMC) instruments have a coil mounted between magnet poles that deflects proportional to current. They are used as ammeters, voltmeters, and galvanometers. As an ammeter, the coil is connected across a low resistance shunt; as a voltmeter, it is connected in series with a high resistance.
3. Moving iron instruments can measure AC using an iron core acted on by a coil
This document discusses different types of megger devices, their uses, and operating principles. It describes a megger as a measuring device used for ground earth testing and insulation testing to determine leakage current and insulation levels. There are two main types: electronic meggers that are battery-operated and have digital displays, and manual meggers that are hand-operated with analog displays. The document also mentions it will cover the construction and working principles of meggers, which use hand cranking or batteries to produce test voltages that are applied to electrical systems to measure insulation.
The document discusses various types of electrical measuring instruments. It describes indicating instruments which have a moving pointer system to directly indicate the measured quantity. The essential components of indicating instruments are the deflecting, controlling, and damping systems. Permanent magnet moving coil instruments are discussed as the most accurate for DC measurements. Moving iron instruments that can be used for both AC and DC are also summarized, including attraction and repulsion types. Sources of error in various instruments are outlined.
1. The document describes magnetic circuits and electromagnetic induction. It defines key terms related to magnetism such as magnetic flux, magnetic field, hysteresis, reluctance, and permeability.
2. The document explains different types of magnetic circuits including simple, composite, and parallel circuits. It also discusses magnetic leakage.
3. Electromagnetic induction is described according to Faraday's law and Lenz's law. Dynamically and statically induced emfs are defined and examples of each are provided.
1) There are several types of losses that reduce the efficiency of DC machines, including electrical or copper losses, core losses, brush losses, mechanical losses, and stray load losses.
2) Electrical losses include losses from the armature winding resistance, shunt field winding resistance, series field winding resistance, and interpole winding resistance.
3) Core losses are hysteresis and eddy current losses and account for around 20% of full load losses.
4) Brush losses are due to the voltage drop and current at the brush contact with the commutator.
A transformer consists of two coils with a mutual magnetic field that allows it to convert alternating current of one voltage to another without changing frequency. It works on the principle of electromagnetic induction between the primary and secondary windings. There are several types of losses that occur in transformers like copper, eddy current, and hysteresis losses. The ratio of voltages out to voltages in depends on the turns ratio of the number of windings in the primary coil to the secondary coil. Transformers can either step up or step down voltages and are used widely in power transmission and applications requiring different voltages.
This document discusses different types of electrical and electronic instruments used for measurement and instrumentation. It describes mechanical, electrical, and electronic instruments. Mechanical instruments measure physical quantities under static conditions, while electronic instruments have a quicker response time than mechanical and electrical instruments. Electrical instruments measure electrical quantities like current, voltage, and power. Instruments can also be categorized as absolute, secondary, digital, analog, indicating, integrating, and recording based on their measurement methodology and output display.
The document discusses various topics related to electrical and electronics measurements. It begins by defining measurement as comparing an unknown value to a known standard using a measuring instrument. It then discusses characteristics of instruments such as calibration, accuracy, precision, repeatability, reproducibility, drift, span, sensitivity, resolution, and dead zone. It also covers types of errors including static, mistakes, systematic, instrumental, environmental, and random errors. Sources of error and types of instruments including absolute, secondary, indicating, recording, and integrating are also summarized.
This document discusses electrical and electronics measurements. It describes the process of measurement by comparing unknown values to known standards. It then discusses key characteristics of instruments used for measurement, including calibration, accuracy, precision, repeatability, reproducibility, drift, span, sensitivity, resolution, and dead zone. The document also covers types of errors in measurement, including static, mistakes, systematic, and random errors. It lists sources of error and types of instruments, including absolute, secondary, indicating, recording, and integrating instruments. Finally, it provides details on permanent magnet moving coil (PMMC) and moving iron (MI) types of indicating instruments.
Introduction to electrical and electronic measurement system where basics on measurement, units, static and dynamic characteristics of instruments, order of instruments, are discussed in brief. Errors in instrumentation system is discussed. Calibration and traceability of instruments are illustrated.
Introduction to Instrumentation p point presentation.pptxDerejeGizaw2
This document provides an overview of an introduction to instrumentation course, including its objectives, contents, and key concepts. The course aims to discuss measurement systems, sensors, signal conditioning circuits, conversion elements, and output devices. It covers general principles like accuracy, precision, sensitivity, and dynamic characteristics. Measurement systems have sensing elements, conditioning circuits, processing elements, and presentation outputs. Sensors convert non-electrical quantities into electrical signals based on physical principles like resistance, induction, thermoelectric effects, and more.
1. The document discusses measurement systems and instrumentation. It covers topics like order of instruments, instrument classification, units of measurement, standards of measurement, dimensions of measurement, and errors in measurement.
2. Instruments can be classified as mechanical, electrical, or electronic. They can also be categorized as absolute, secondary, digital, or analogue instruments.
3. The seven base SI units are meter, kilogram, second, Kelvin, mole, candela, and ampere. Derived units are formed by combining base units.
4. Standards provide defined relationships to measurement units and are used to calibrate other instruments. Primary standards define measurement units while secondary and working standards are calibrated against primary standards.
the above PPT will give a brief idea of the measuring device used in the field of Mechanical Engineering with images related to the topics in the field of measurement.
This document provides an introduction to instruments used for measurement. It discusses that an instrument is a device that determines the magnitude of a quantity being measured, such as voltage, current, power or energy. It then classifies instruments as either analog or digital. Analog instruments have outputs that are continuous functions of time with a constant relation to the input. The document describes various types of analog instruments and principles of their operation, which include magnetic, thermal, electrostatic, induction and Hall effects. It also discusses torques involved in instrument operation, including deflecting, controlling and damping torques, and methods used for damping such as air friction, fluid friction and eddy currents.
ELECTRICAL AND ELECTRONICS MEASUREMENT Dinesh Sharma
This document discusses measurement techniques and instruments. It covers the basic components, classifications, functions, and errors of measurement instruments. The key points are:
- Measurement instruments have components for deflection, control, and damping of the pointer. Deflection indicates the measured quantity, control opposes deflection, and damping reduces oscillations.
- Instruments can be classified as analog or digital, absolute or secondary. Accuracy depends on design, materials, and errors like systematic, random, and environmental errors.
- Measurements involve comparing an unknown quantity to a standard and expressing the result numerically. Direct comparison is used when possible, otherwise indirect methods are used. Proper standards and methods are required for meaningful results.
Electrical measuring instruments can be classified in several ways, including by the quantity being measured, operating principle, or type of output. Common classifications include absolute versus secondary instruments, indicating versus recording or integrating instruments, and moving iron, moving coil, hot wire, or induction types.
Potentiometers are used to measure voltage by balancing an unknown voltage against a known voltage gradient along a uniform resistance wire. Instrument transformers like current and potential transformers are used to measure high voltages and currents safely by transforming values down to levels that can be read by standard meters. They allow insulation of the measurement circuit from the high voltages and currents in the main circuit.
Electrical measuring instruments can be classified in several ways, including by the type of quantity measured, principle of operation, or function. Indicating instruments directly show the measured value, recording instruments continuously record variations over time, and integrating instruments measure total quantity or energy supplied over a period. Common indicating instruments include moving-iron, moving-coil, hot-wire, and induction types. They operate based on deflecting, controlling, and damping torques to provide a steady measurement reading. Instrument transformers like potentiometers are used to compare voltages and find internal resistances, while induction-type wattmeters measure power by inducing eddy currents in a disc from separate magnetic fluxes proportional to voltage and current.
Electrical measuring instruments can be classified in several ways, including by the type of quantity measured, principle of operation, or function. Indicating instruments directly show the measured value, recording instruments continuously record variations over time, and integrating instruments measure total quantity or energy supplied over a period. Common indicating instruments include moving-iron, moving-coil, hot-wire, and induction types. They operate based on deflecting, controlling, and damping torques to provide a steady measurement reading. Instrument transformers like potentiometers are used to compare voltages and find internal resistances, while induction-type wattmeters measure power by inducing eddy currents in a disc from separate magnetic fluxes proportional to voltage and current.
The document defines basic instrumentation and describes the key functional elements of instruments, including primary sensors, variable conversion elements, and signal processing elements. It discusses different types of instruments such as active vs passive, null-type vs deflection-type, analogue vs digital, indicating vs signal output instruments, and smart vs non-smart instruments. The document also covers static instrument characteristics like accuracy, precision, repeatability, and reproducibility. Choosing the appropriate instrument depends on factors like required measurement accuracy and environmental conditions.
These slides describes the deifintion of measurement, Classification of instruments and methods of measurement.
Read the full blog post here: https://bit.ly/32prjeT
This document discusses sensors and transducers. It begins by defining sensors as devices that convert physical phenomena into electrical signals, and transducers as the interface between the physical world and electrical devices. It then describes several key performance characteristics of sensors, including transfer function, sensitivity, dynamic range, accuracy, precision, nonlinearity, resolution, stability, and hysteresis. Different types of sensors are classified based on their signal characteristics, power supply needs, and subject of measurement. Examples of common sensors like position, velocity, light, flow, and proximity sensors are provided.
This document provides an overview of analog ammeters and voltmeters. It discusses:
1. The classification of instruments as either absolute or secondary, and examples of each type.
2. The operating torques required for instrument operation including deflecting, controlling, and damping torques. It describes common mechanisms for each type of torque.
3. Specific instrument types are discussed in detail, including permanent magnet moving coil (PMMC) instruments, moving iron instruments, and extensions to their measurement ranges using shunts and multipliers.
The document serves as an introduction to basic analog measurement instrument principles and components.
This document provides an overview of analog ammeters and voltmeters. It discusses their classification, operating torques including deflecting, controlling, and damping torques. Common instrument types are described like moving iron, permanent magnet moving coil, and electrostatic instruments. Construction, torque equations, range extension, temperature effects, errors and compensations are covered. Instrument transformers like current and potential transformers are introduced along with their construction, theory, and errors.
Here are the steps to solve this homework problem:
1) Draw the load curves and load duration curves for regions A and B separately and then combine them for the total system:
[FIGURE OF 6 LOAD CURVES]
2) To find the average load and load factor of the total system:
- Total energy = Area under the total load curve = ? kWh
- Time period = 24 hours
- Average load = Total energy / Time period = ? kW
- Max demand of total system = 7500 kW
- Load factor = Average load / Max demand = ?
3) Plant capacity is given as 10 MW. Reserve capacity = Plant capacity - Max demand = 10 MW - 7.5
Hydroelectric power plants generate electricity by harnessing the kinetic energy of flowing water. Dams are constructed to store water in reservoirs, increasing its potential energy. The water is then released through turbines, converting the kinetic energy to mechanical energy that spins generators to produce electricity. Hydroelectric power plants are classified based on factors like water flow availability, water head, and the type of load supplied. They have advantages like being renewable, low-cost to operate, and providing flood control and irrigation benefits. However, their construction is expensive and can negatively impact local communities and ecosystems.
Thermal power plants generate electricity by converting the heat energy from burning coal into mechanical energy using steam to power turbines that spin generators. They have several key components including coal and ash handling, steam generation in boilers, steam turbines connected to alternators to produce electricity, and cooling systems like condensers and cooling towers. Thermal power plants provide a reliable source of bulk electricity but have disadvantages like air pollution and higher operating costs compared to other generation methods.
The document discusses bus network topology, which is a local area network topology where each node connects to a single main cable or bus. All nodes on the bus can communicate with each other via the singular network segment. A key characteristic of the bus topology is that every station receives all network traffic and has equal transmission priority when sending data over the bus.
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A workshop hosted by the South African Journal of Science aimed at postgraduate students and early career researchers with little or no experience in writing and publishing journal articles.
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This Dissertation explores the particular circumstances of Mirzapur, a region located in the
core of India. Mirzapur, with its varied terrains and abundant biodiversity, offers an optimal
environment for investigating the changes in vegetation cover dynamics. Our study utilizes
advanced technologies such as GIS (Geographic Information Systems) and Remote sensing to
analyze the transformations that have taken place over the course of a decade.
The complex relationship between human activities and the environment has been the focus
of extensive research and worry. As the global community grapples with swift urbanization,
population expansion, and economic progress, the effects on natural ecosystems are becoming
more evident. A crucial element of this impact is the alteration of vegetation cover, which plays a
significant role in maintaining the ecological equilibrium of our planet.Land serves as the foundation for all human activities and provides the necessary materials for
these activities. As the most crucial natural resource, its utilization by humans results in different
'Land uses,' which are determined by both human activities and the physical characteristics of the
land.
The utilization of land is impacted by human needs and environmental factors. In countries
like India, rapid population growth and the emphasis on extensive resource exploitation can lead
to significant land degradation, adversely affecting the region's land cover.
Therefore, human intervention has significantly influenced land use patterns over many
centuries, evolving its structure over time and space. In the present era, these changes have
accelerated due to factors such as agriculture and urbanization. Information regarding land use and
cover is essential for various planning and management tasks related to the Earth's surface,
providing crucial environmental data for scientific, resource management, policy purposes, and
diverse human activities.
Accurate understanding of land use and cover is imperative for the development planning
of any area. Consequently, a wide range of professionals, including earth system scientists, land
and water managers, and urban planners, are interested in obtaining data on land use and cover
changes, conversion trends, and other related patterns. The spatial dimensions of land use and
cover support policymakers and scientists in making well-informed decisions, as alterations in
these patterns indicate shifts in economic and social conditions. Monitoring such changes with the
help of Advanced technologies like Remote Sensing and Geographic Information Systems is
crucial for coordinated efforts across different administrative levels. Advanced technologies like
Remote Sensing and Geographic Information Systems
9
Changes in vegetation cover refer to variations in the distribution, composition, and overall
structure of plant communities across different temporal and spatial scales. These changes can
occur natural.
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বাংলাদেশের অর্থনৈতিক সমীক্ষা ২০২৪ [Bangladesh Economic Review 2024 Bangla.pdf] কম্পিউটার , ট্যাব ও স্মার্ট ফোন ভার্সন সহ সম্পূর্ণ বাংলা ই-বুক বা pdf বই " সুচিপত্র ...বুকমার্ক মেনু 🔖 ও হাইপার লিংক মেনু 📝👆 যুক্ত ..
আমাদের সবার জন্য খুব খুব গুরুত্বপূর্ণ একটি বই ..বিসিএস, ব্যাংক, ইউনিভার্সিটি ভর্তি ও যে কোন প্রতিযোগিতা মূলক পরীক্ষার জন্য এর খুব ইম্পরট্যান্ট একটি বিষয় ...তাছাড়া বাংলাদেশের সাম্প্রতিক যে কোন ডাটা বা তথ্য এই বইতে পাবেন ...
তাই একজন নাগরিক হিসাবে এই তথ্য গুলো আপনার জানা প্রয়োজন ...।
বিসিএস ও ব্যাংক এর লিখিত পরীক্ষা ...+এছাড়া মাধ্যমিক ও উচ্চমাধ্যমিকের স্টুডেন্টদের জন্য অনেক কাজে আসবে ...
This slide is special for master students (MIBS & MIFB) in UUM. Also useful for readers who are interested in the topic of contemporary Islamic banking.
How to Fix the Import Error in the Odoo 17Celine George
An import error occurs when a program fails to import a module or library, disrupting its execution. In languages like Python, this issue arises when the specified module cannot be found or accessed, hindering the program's functionality. Resolving import errors is crucial for maintaining smooth software operation and uninterrupted development processes.
2. Classification of Measuring Instruments
• The instrument used for measuring the physical and electrical quantities is
known as the measuring instrument. The term measurement means the
comparison between the two quantities of the same unit. The magnitude of
one of the quantity is unknown, and it is compared with the predefined value.
The result of the comparison obtained regarding numerical value.
• The measuring instrument categorized into three types;
1. Electrical Instrument
2. Electronic Instrument
3. Mechanical Instrument
• The mechanical instrument uses for measuring the physical quantities. This
instrument is suitable for measuring the static and stable condition because
the instrument is unable to give the response to the dynamic condition.
• The electronic instrument has quick response time. The instrument provides
the quick response as compared to the electrical and mechanical instrument.
3. • The electrical instrument is used for measuring electrical quantities likes
current, voltage, power, etc. The ammeter, voltmeter, wattmeter are the
examples of the electrical measuring instrument
• The ammeter measures the current in amps; voltmeter measures voltage
and Wattmeter are used for measuring the power.
• The classification of the electric instruments depends on the methods of
representing the output reading
4.
5. • Absolute Instrument
The absolute instrument gives the value of measures quantities
regarding the physical constant.
The physical constant means the angle of deflection, degree and
meter constant. The mathematical calculation requires for
knowing the value of a physical constant.
6. • Secondary Instrument
In the secondary instrument, the deflection shows the
magnitude of the measurable quantities. The calibration of the
instruments with the standard instrument is essential for the
measurement. The output of this type of device is directly
obtained, and no mathematical calculation requires for knowing
their value.
Digital Instrument
The digital instrument gives the output in the numeric form. The
instrument is more accurate as compared to the analogue
instrument because no human error occurs in the reading.
7. • Analog instrument
The instrument whose output varies continuously is known as the
analogue instrument. The analogue instrument has the pointer which
shows the magnitude of the measurable quantities. The analogue
device classifies into two types.
Null Type Instrument
In this instrument, the zero or null deflection indicates the magnitude
of the measured quantity. The instrument has high accuracy and
sensitivity. In null deflection instrument, the one known and one
unknown quantity use. When the value of the known and the
unknown measuring quantities are equal, the pointer shows the zero
or null deflection. The null deflection instrument is used in the
potentiometer and in galvanometer for obtaining the null point.
8. • Deflection Type Instrument
The instrument in which the value of measuring quantity is
determined through the deflection of the pointer is known as
the deflection type instrument. The measuring quantity deflects
the pointer of the moving system of the instrument which is
fixed on the calibrated scale. Thus, the magnitude of the
measured quantity is known.
The deflection type instrument is further sub-classified into
three types.
1. Indicating Instrument
2. Integrating Instrument
3. Recording Instrument
9. Indicating Instrument –
The instrument which indicates the magnitude of the measured
quantity is known as the indicating instrument. The indicating
instrument has the dial which moves on the graduated dial. The
voltmeter, ammeter, power factor meter are the examples of the
indicating instrument.
Integrating Instrument –
The instrument which measures the total energy supplied at a
particular interval of time is known as the integrating instrument. The
total energy measured by the instrument is the product of the time
and the measures electrical quantities. The energy meter, watt-hour
meter and the energy meter are the examples of integrating
instrument
10. Recording Instrument –
The instrument records the circuit condition at a particular
interval of time is known as the recording instrument. The
moving system of the recording instrument carries a pen which
lightly touches on the paper sheet. The movement of the coil is
traced on the paper sheet. The curve drawn on the paper shows
the variation in the measurement of the electrical quantities.
11. Principles of operation of Electrical
Instruments
• Electrical measuring instruments work on the
principle of operation of a different effect such
as Magnetic effect, Electro-dynamic effect,
Electromagnetic Induction, thermal Effect,
Chemical Effect, Electrostatics Effect etc.
• The principle of operation of the different
electrical instrument is given in the table below-
13. Characteristic Of Electrical Measuring
Instruments
Accuracy:
It is desirable quality in measurement. It is defined as the degree
of the closeness with which instrument reading approaches the
true value of the quantity being measured. Accuracy can be
expressed in three ways
Point accuracy
Accuracy as the percentage of scale of range
Accuracy as percentage of true value.
14. Sensitivity:
It is also desirable quality in the measurement. It is
defined as the ratio of the magnitude response of
the output signal to the magnitude response of the
input signal.
Precision:
It is a measure of the reproducibility of the
measurements i.e., given a fixed value of quantity,
precision is a measure of the degree of agreement
within a group of measurements. The term precise
means clearly or sharply defined
15. Stability:
The ability of a measuring system to maintain standard of
performance over prolonged periods of time. Zero stability
defines the ability of an instrument restore to zero reading after
the input quantity has been brought to zero, while other
conditions remain the same.
16. 1. Essential Requirement of Indicating Instruments
1. Deflecting torque
2. Controlling torque
i.Spring Control method
ii Gravity control method
3. Damping torque or restoring torque
i. Air friction damping
ii. Eddy current damping
2. Moving Iron Instruments
Attraction type M. I. Instruments
Repulsion type M. I. Instruments
3. Permanent Magnet Moving Coil Instruments
18. Deflecting system:
• The deflection produced by the operating torque is proportional to the
magnitude of the electrical quantity such as current, voltage, etc. being
measured.
• The deflecting torque causes the moving mechanism to move from its
initial zero position.
Controlling system:
• Torque produced by the controlling system is in opposition to the
deflecting torque.
• Pointer comes to rest when deflecting and controlling torques are equal.
Damping system:
• To minimize the oscillations in the deflecting system.
• Air friction damping, Eddy current damping
Essential features of measuring Instruments
19. Deflecting Torque
• Deflecting torque causes
the moving system and
pointer of the instrument
to move from its zero
position.
• Production of deflecting
torque depends upon the
type of indicating
instrument and its principle
of operation
20. Controlling Torque
Controlling torque limits the movement of
pointer and ensures that the magnitude of
deflection is unique and is always same for the
given value of electrical quantity to be measured.
22. Spring Control
method
1. Two phosphor bronze hair
springs of spiral shapes are
attached to the spindle of the
moving system of the
instrument.
2. They are wound in opposite
direction
3. Pointer is attached to the
spindle of the moving system
23. Working of Spring
Control Method
1. When the moving system deflected,
one spring gets wounded and the
other one gets unwounded. This
results in controlling torque whose
magnitude is directly proportional to
angle of deflection.
2. Td is proportional to
directly
current I and Tc is
proportional to deflection
at final steady state Td
directly
angle,
= Tc,
deflection is directly proportional
to current, hence scale is linear
24. Gravity Control Method
1. In gravity control method, a small
weight is attached to the spindle of
the moving system. Due to the
gravitational pull, a control torque
(acting in opposite direction to the
deflecting torque) is produced
whenever the pointer tends to move
away from its initial position.
2. In this case, Td is directly
proportional to current I and Tc is
directly proportional to sine of the
deflection angle, since Td = Tc, sine
of the deflection is directly
proportional to current, hence scale is
non linear i.e. cramped scale.
25. Damping torque
• Damping torque minimizes the oscillations of the pointer about the final
steady state deflection and makes it steady.. In the absence of this torque,
pointer continues oscillating to its final position after reaching to its final
position.
• Depending on the magnitude of damping, it can be classified as under
damped, over damped and critical damp
27. Air Friction damping
• A light aluminum frame is attached to
the moving system. This piston moves
in an air chamber (cylinder) closed at
one end. At the time of oscillation of
the moving system or pointer about its
final steady state, if the piston is
moving into the chamber, the trapped
air gets compressed and the pressure
opposes the motion of the piston (and
pointer). Similarly, if the piston
moving out of the chamber,
therefore the moving system or
is
the
pressure in the closed chamber falls
and becomes less than air pressure on
the outer part of the piston. Motion is
thus again opposed. Oscillations are
damped.
29. Eddy current damping
• Construction & Working
1. An aluminum frame or damping disc is mounted on the spindle and free to
rotate in the magnetic field provided by damping magnets. Since damping
disc is rotating with spindle, emf is induced in the disc according to
faradays law of electromagnetic induction. Since disc is a closed circuit,
eddy current in the form of concentric circles will be induced in the
damping disc. Interaction between this eddy current and magnetic field
develops a force on the damping disc which opposes the movement of
sheet. And thus provides damping of the oscillations of the pointer.
31. Construction
1.Instrument consists of a stationary coil in which the current to be
measured is passed.
2.A piece of un-magnetized soft iron which is of oval shape is mounted
rigidly on the spindle. This soft iron piece is free to move about the spindle
and along with the spindle.
Working
1. The current to be measured is flowing in the coil, produces a magnetic
field. Iron piece gets attracted towards centre of the magnetic field
and pointer deflects on the scale.
2. Control torque is provided either by control springs or by gravity control
method
3. Damping is provided by air friction damping
4. The scale is non-linear. Mirror is provided to avoid parallax error.
32. Attraction type M. I.
Instruments
• Construction
1. This instrument consists of stationary coil in which current I that is to
be measured is passed
2. A piece of un-magnetised soft iron which is oval in shape is mounted
rigidly on the spindle. This soft iron piece is free to move about the
spindle and along with the spindle. It is placed closer to thestationary
coil as shown in fig.
3. A pointer is fixed on the spindle.
33. Repulsion type M. I.
Instruments
Construction
• This instrument consists of two iron vanes, one is attached to the stationary
coil and other one is attached to the movable spindle.
• Both vanes are surrounded by the stationary coil, current to be measured is
passing thorough this coil.
34. Repulsion type M. I.
Instruments
Working
Current to be measured is passing thorough stationary coil produces magnetic field.
Both the vanes magnetizes with similar polarities.
As a result a force of repulsion is set up between two vanes.
This force produces a deflecting torque on the movable vanes, gives deflection on
the scale.
General Torque equation of M. I. Instruments
Td
1
I 2 dL
2 d
35.
36. Permanent Magnet Moving Coil
Instruments
Construction
• It consists of permanent magnet which is stationary.
• Moving system consists of a spindle attached to a rectangular aluminum frame. A
coil made up of thin copper wire is wound over the frame. The current to be
measured is passed through this coil.
• A soft iron core is placed in the in the space within the aluminumframe.
• Two spiral springs are mounted on the spindle to produce control torque. Control
spring also serves an additional purpose & acts as controllead.
• Pointer is mounted on spindle. Mirror is provided below the scale to avoid
parallax error. The spindle is supported by jeweled bearings.
37. Permanent Magnet Moving
Coil Instruments
Working
1.The current to be measured is passed through moving coil via control springs.
2. A current carrying moving coil is now in a magnetic field. According to Flemings
left hand rule, torque is produced on the coil and coil moves, pointer deflects.
3. Damping torque is provided by eddy current damping method.
Mechanical force experienced by the coil
F = NBIL newton
Deflecting Torque Td α I
Controlling torque Tc α θ
At equilibrium Td = Tc
Therefore, θ α I
Torque equation -Deflection is proportional to current
Hence, Scale is Uniform (Linear)
38. Permanent Magnet Moving Coil Instruments
Errors in PMMC Instruments
• Weakening of permanent magnet due to ageing and temperature
effects
• Weakening of springs due to ageing and temperature effects
• Change of resistance of moving coil with temperature.
Merits
• Uniform scale for the instrument
• Power consumption is very low
• A single instrument can be used for different current and voltage
ranges
• The toque-weight ratio is high gives higher accuracy.
Demerits
• This instrument can be used only on DC supply
• The cost of the instrument is more than M.I. Instruments
39. Extension of meter range: DC Ammeters
Shunt Resistor
m
sh
R
I I
Im Rm
Shunt is a very low resistance connected across the basic meter.
Rm= internal resistance of the basic meter.
Rsh = Resistance of the shunt
Im= full scale deflection of basic meter.
I = Current to be measured.
40. Extension of meter range:
Voltmeter multipliers
• Multiplier is a very high resistance
in series with the basic meter
• Basic dc voltmeter circuit
• Voltmeter sensitivity :
m
m
m
s
I
I
R R
V
V I m Rm
V
I fsd
S
1