This document summarizes an invention for improving regulating systems for synchronous generators. It describes a system that incorporates automatic means to prevent reduction of generator excitation below the stability limit. It does this by overriding the automatic voltage regulator to boost excitation if it falls below a value determined by generator load current. The system compares generator output voltage to a reference and injects a quantity into the comparison circuit to boost excitation if needed to maintain synchronization.
This document describes a patent application for improvements to regulating systems for dynamo-electric machines. Specifically, it describes a system that incorporates means to automatically prevent reduction of generator excitation below the stability limit. The system includes an automatic voltage regulator and overriding control means that prevent excitation from falling below a value determined by the magnitude of the generator load current.
This document describes a patent application from 1957 relating to regulating systems for synchronous generators. It aims to provide an improved system that can automatically prevent reduction of generator excitation below the stability limit. The system includes an automatic voltage regulator and overriding control means that prevent excitation from falling below a value determined by the magnitude of the generator load current. The overriding control means respond to electrical quantities relating to excitation and load current, and can boost excitation if needed to maintain stability.
This document describes a patent application for improvements to regulating systems for dynamo-electric machines. Specifically, it describes a system that incorporates means to automatically prevent reduction of generator excitation below the stability limit. The system includes an automatic voltage regulator and overriding control means that prevent excitation from falling below a value determined by the magnitude of the generator load current.
This document provides installation and setup instructions for the ACTURA 48 701z power system. It includes descriptions of the power system components, sub-assemblies, and system controller. Installation instructions are provided for unpacking, mounting, making AC and DC connections, installing batteries, and setting up communication. Technical specifications for the power system and its rectifier modules are also included in an annex.
This document provides installation and commissioning instructions for an Integrated Power Management Unit (IPMU). The IPMU integrates a switch mode power supply and power management unit to provide power from the mains or generator to critical loads like a battery bank and BTS equipment. The summary includes:
1. The IPMU receives power from the mains or generator, regulates the voltage with transformers, and provides power to rectifier modules and battery bank.
2. Commissioning involves checking voltages and connections between the IPMU, generator, battery bank, and critical loads. Alarms are also connected from the IPMU and switch mode power supply to alert operators.
3. Detailed wiring diagrams and instructions are provided
This document provides information on the BA6238A, BA6238AN, BA6239A, and BA6239AN motor driver ICs, which incorporate two reversible motor drivers suitable for driving small DC brush motors. Each IC contains built-in power transistors for motor driving and thermal shutdown circuits to protect from overheating. The document includes specifications, application examples, operating procedures, and electrical characteristic curves for the motor driver ICs.
The document provides information on the SX460 Automatic Voltage Regulator (AVR) including:
1) The AVR is used to regulate generator voltage and includes under-speed and loss of sensing protection. It controls power to the exciter field to maintain output voltage.
2) The AVR samples generator output voltage and uses feedback to control power to the exciter field, compensating for loads and maintaining voltage.
3) It provides under-frequency protection by reducing output voltage proportionally below a preset threshold based on generator speed.
Static Excitation System of Generator in Hydropower Stationijtsrd
Excitation system is one of the most important parts of the synchronous generators. Excitation system of the generator comprises from machines, devices and appliances that are intended to provide direct current to the generator field winding and this current regulation. For a constant frequency supply, the output voltage of the machine depends on the excitation current. In this paper, static excitation system of 10 MW synchronous generator in hydropower station is described and analyzed how the excitation current can be controlled to be stable terminal voltage and reactive power of generator. Thida Win | Hnin Yu Lwin | Zin Wah Aung "Static Excitation System of Generator in Hydropower Station" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-5 , August 2019, URL: https://www.ijtsrd.com/papers/ijtsrd26742.pdf Paper URL: https://www.ijtsrd.com/engineering/electrical-engineering/26742/static-excitation-system-of-generator-in-hydropower-station/thida-win
This document describes a patent application for improvements to regulating systems for dynamo-electric machines. Specifically, it describes a system that incorporates means to automatically prevent reduction of generator excitation below the stability limit. The system includes an automatic voltage regulator and overriding control means that prevent excitation from falling below a value determined by the magnitude of the generator load current.
This document describes a patent application from 1957 relating to regulating systems for synchronous generators. It aims to provide an improved system that can automatically prevent reduction of generator excitation below the stability limit. The system includes an automatic voltage regulator and overriding control means that prevent excitation from falling below a value determined by the magnitude of the generator load current. The overriding control means respond to electrical quantities relating to excitation and load current, and can boost excitation if needed to maintain stability.
This document describes a patent application for improvements to regulating systems for dynamo-electric machines. Specifically, it describes a system that incorporates means to automatically prevent reduction of generator excitation below the stability limit. The system includes an automatic voltage regulator and overriding control means that prevent excitation from falling below a value determined by the magnitude of the generator load current.
This document provides installation and setup instructions for the ACTURA 48 701z power system. It includes descriptions of the power system components, sub-assemblies, and system controller. Installation instructions are provided for unpacking, mounting, making AC and DC connections, installing batteries, and setting up communication. Technical specifications for the power system and its rectifier modules are also included in an annex.
This document provides installation and commissioning instructions for an Integrated Power Management Unit (IPMU). The IPMU integrates a switch mode power supply and power management unit to provide power from the mains or generator to critical loads like a battery bank and BTS equipment. The summary includes:
1. The IPMU receives power from the mains or generator, regulates the voltage with transformers, and provides power to rectifier modules and battery bank.
2. Commissioning involves checking voltages and connections between the IPMU, generator, battery bank, and critical loads. Alarms are also connected from the IPMU and switch mode power supply to alert operators.
3. Detailed wiring diagrams and instructions are provided
This document provides information on the BA6238A, BA6238AN, BA6239A, and BA6239AN motor driver ICs, which incorporate two reversible motor drivers suitable for driving small DC brush motors. Each IC contains built-in power transistors for motor driving and thermal shutdown circuits to protect from overheating. The document includes specifications, application examples, operating procedures, and electrical characteristic curves for the motor driver ICs.
The document provides information on the SX460 Automatic Voltage Regulator (AVR) including:
1) The AVR is used to regulate generator voltage and includes under-speed and loss of sensing protection. It controls power to the exciter field to maintain output voltage.
2) The AVR samples generator output voltage and uses feedback to control power to the exciter field, compensating for loads and maintaining voltage.
3) It provides under-frequency protection by reducing output voltage proportionally below a preset threshold based on generator speed.
Static Excitation System of Generator in Hydropower Stationijtsrd
Excitation system is one of the most important parts of the synchronous generators. Excitation system of the generator comprises from machines, devices and appliances that are intended to provide direct current to the generator field winding and this current regulation. For a constant frequency supply, the output voltage of the machine depends on the excitation current. In this paper, static excitation system of 10 MW synchronous generator in hydropower station is described and analyzed how the excitation current can be controlled to be stable terminal voltage and reactive power of generator. Thida Win | Hnin Yu Lwin | Zin Wah Aung "Static Excitation System of Generator in Hydropower Station" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-5 , August 2019, URL: https://www.ijtsrd.com/papers/ijtsrd26742.pdf Paper URL: https://www.ijtsrd.com/engineering/electrical-engineering/26742/static-excitation-system-of-generator-in-hydropower-station/thida-win
This document is the specification for a British patent application regarding an electrical follow-up system using a magnetic amplifier. The system uses a sub-carrier frequency to modulate an error signal and applies it to the magnetic amplifier. It then renders ineffective low frequency components modulated by the sub-carrier to eliminate effects of instability. An embodiment described uses the system in a liquid contents gauge with capacitors to measure liquid volume. The error signal is amplified and applied to a motor to adjust the measured volume to match the actual volume.
This document summarizes the construction and operation of a medium power 144MHz VHF amplifier using a single 4CX250R power tube. The amplifier is capable of producing 400 watts of RF output power with 8 watts of input drive. Key components include a tuned input circuit, air variable plate and load tuning capacitors, forced air cooling, and high and low voltage power supplies. The high voltage supply provides up to 4,000 volts DC at 400 mA to power the tube.
Synchronous generators have a rotor with windings that are excited by a rotating exciter. The exciter provides power to the rotor windings which generate a magnetic field. An automatic voltage regulator controls the generator output voltage by adjusting the field current using a thyristor circuit to bypass a portion of the excitation current. It compares the generator voltage to a setpoint and controls the thyristor firing pulses accordingly. In parallel operation, droop compensation equipment ensures uniform reactive power sharing by reducing the generator voltage linearly as reactive current increases.
1. The document provides instructions for hardwiring the input and output of a Smart-UPS UPS, including removing covers, jumpers, and strain relief bars and connecting wires according to wiring specifications.
2. Wires should be connected to the terminal blocks in the specified order of ground first and input and output wiring trays installed.
3. The document describes single and three phase input and output wiring options and provides wiring diagrams.
This document summarizes British patent GB780166 (A) filed in 1957 regarding improvements to electric voltage regulating apparatus. It describes a system using multiple booster transformers connected in series, with each transformer's primary connected to a single voltage regulator through switching means. This allows a single regulator to control voltage over a wide range by sequentially activating the boosters. The switching is designed to occur at near-zero voltage differences to minimize issues.
The document summarizes a vertical deflection booster integrated circuit. It can handle flyback voltages up to 90V and provides up to 2.6A of output current. It has thermal protection and can operate with power supply voltages up to 42V. The document includes application examples, electrical specifications, and packaging details.
The BA6191 is a 2-channel motor driver IC that can be used in applications like CD players. It has four operating modes - forward, reverse, stop, and brake - that are selected by two control logic inputs. It uses a negative power supply and has protections like thermal shutdown and power supply voltage drop muting. The IC outputs a voltage twice the reference voltage in forward and reverse modes and stops output or brakes in the other modes.
This document provides an installation and adjustments manual for a Power Factor Controller (PFC3) that is designed to control the power factor and reactive current of a generator running in parallel with the main electrical grid. It describes the various operating modes and safety features of the PFC3, including power factor control, reactive current control, generator current limiting, low excitation limiting, and voltage matching. The document also covers installation, commissioning, user controls, operation, troubleshooting and specifications.
Automatic voltage regulations And V curves of alternatorsMUDASSARHABIB5
This document discusses automatic voltage regulation and V-curves in alternators. It begins by defining voltage regulation as the change in terminal voltage from no-load to full-load conditions. It then describes different types of voltage regulators, including manual and automatic voltage regulators. For automatic voltage regulators, it discusses the components, circuit concept, and functions of electronic voltage regulators. Finally, it explains V-curves, which plot the variation of armature current with changes in field current, and describes the three stages of under excitation, normal excitation, and over excitation.
The MC/MF Series mounting cards are designed to host up to three AMC 10A8 servo amplifier modules. The cards provide power and signal connections to the amplifiers and include potentiometers for configuring inputs, outputs, gains and limits. Models beginning with MC host amplifiers only, while MF models also include onboard filters on the motor lines. The document provides details on configuration, tuning and specifications for the mounting cards.
The MC/MF Series mounting cards are designed to host up to three AMC 10A8 servo amplifier modules. The cards provide power and signal connections to the amplifiers and include potentiometers for configuring inputs, outputs, gains and limits. Models beginning with MC host amplifiers only, while MF models also include onboard filters on the motor lines. The document provides details on configuration, tuning and specifications for the mounting card series.
The MC/MF Series mounting cards are designed to host up to three AMC 10A8 servo amplifier modules. The cards provide power and signal connections to the amplifiers and include potentiometers for configuring inputs, outputs, gains and limits. Models beginning with MC host amplifiers only, while MF models also include onboard filters on the motor lines. The document provides details on configuration, tuning and specifications for the mounting card series.
CÔNG TY CỔ PHẦN THIẾT BỊ ĐIỆN HOÀNG PHƯƠNG
Địa chỉ: Số 10, ngõ 44, phố Võ Thị Sáu, P.Thanh Nhàn, Q.Hai Bà Trưng, TP. Hà Nội
MST: 0106798886
Điện thoại: 024.3215.1322
Website : Hoangphuongjsc.com
Phone/Zalo : 0944 240 317 / Kinhdoanh1.hpe@gmail.com
Phone/Zalo : 0975 123 698 / Kinhdoanh2.hpe@gmail.com
Phone/Zalo : 0961 008 858 / Kinhdoanh3.hpe@gmail.com
1. The document discusses the Southern Grid which transmits power across five states in Southern India.
2. It has an installed capacity of 50,164 MW from various sources including thermal, hydro, gas etc. distributed across states.
3. The grid ensures stability through interconnected regional grids using HVDC links and maintains frequency, voltage levels through mechanisms like AGC, reactive power support etc.
The GPU 1500/40 is a hand-portable ground power unit that provides 28V DC power. It has a 40 amp continuous output and can recharge its internal batteries in 20 minutes to provide power for small to medium turboprop aircraft and helicopters. The unit is 300mm tall, 400mm long, 135mm wide and weighs 26kg. It has a digital display, independent 20 amp power modules for redundancy, a 10 amp accessory socket, and can be coupled to another unit for additional power capacity. The GPU 1500/40 has been widely used since 2001 by military and civilian operators worldwide to start aircraft engines.
The BA6219B and BA6219BFP-Y are reversible motor driver ICs suitable for brush motors. They have two logic inputs that allow four output modes: forward, reverse, idling, and braking. The motor speed can be set arbitrarily by controlling the voltage applied to the motor. Key features include a large output current, thermal shutdown protection, and pins to set the output voltage. Application examples are provided.
The document describes the S30A series of three-phase brushless servo amplifiers manufactured by Electromate. The amplifiers are small surface-mount devices that provide sinusoidal drive and current control to three-phase brushless motors. They require two sinusoidal command signals with 120 degree phase shift for external commutation and control motor torque based on signal amplitude. The amplifiers protect the motor from over-voltage, under-voltage, over-current, over-heating and short-circuits.
The document describes the S30A series of three-phase brushless servo amplifiers manufactured by Electromate. The amplifiers are small surface-mount devices that provide sinusoidal drive and current control to three-phase brushless motors. They require two sinusoidal command signals with 120 degree phase shift for external commutation and control motor torque based on signal amplitude. The amplifiers protect the motor from over-voltage, under-voltage, over-current, over-heating and short-circuits.
The document describes Thor Power Corporation's Trezium power system. The system consists of a patented microelectronic power converter and permanent magnet power unit called Grismir. The power converter uses vector control for high efficiency and torque control. Grismir is a brushless, slotless, sensorless AC motor that can operate as a motor, generator, or alternator with over 90% efficiency. The Trezium system provides benefits like universality, high efficiency, compact size, and wide input voltage range.
This document describes a patent application for an airplane stabilizer. It proposes lowering a weighted device below the airplane to displace the center of gravity downward, increasing stability. This creates a restoring moment when the plane rolls or tips that rights the plane. The stabilizer can be raised for normal flight and lowered during takeoffs, landings, or bad weather to improve safety by reducing the risk of stalling or capsizing due to loss of stability.
This document is the specification for a British patent application regarding an electrical follow-up system using a magnetic amplifier. The system uses a sub-carrier frequency to modulate an error signal and applies it to the magnetic amplifier. It then renders ineffective low frequency components modulated by the sub-carrier to eliminate effects of instability. An embodiment described uses the system in a liquid contents gauge with capacitors to measure liquid volume. The error signal is amplified and applied to a motor to adjust the measured volume to match the actual volume.
This document summarizes the construction and operation of a medium power 144MHz VHF amplifier using a single 4CX250R power tube. The amplifier is capable of producing 400 watts of RF output power with 8 watts of input drive. Key components include a tuned input circuit, air variable plate and load tuning capacitors, forced air cooling, and high and low voltage power supplies. The high voltage supply provides up to 4,000 volts DC at 400 mA to power the tube.
Synchronous generators have a rotor with windings that are excited by a rotating exciter. The exciter provides power to the rotor windings which generate a magnetic field. An automatic voltage regulator controls the generator output voltage by adjusting the field current using a thyristor circuit to bypass a portion of the excitation current. It compares the generator voltage to a setpoint and controls the thyristor firing pulses accordingly. In parallel operation, droop compensation equipment ensures uniform reactive power sharing by reducing the generator voltage linearly as reactive current increases.
1. The document provides instructions for hardwiring the input and output of a Smart-UPS UPS, including removing covers, jumpers, and strain relief bars and connecting wires according to wiring specifications.
2. Wires should be connected to the terminal blocks in the specified order of ground first and input and output wiring trays installed.
3. The document describes single and three phase input and output wiring options and provides wiring diagrams.
This document summarizes British patent GB780166 (A) filed in 1957 regarding improvements to electric voltage regulating apparatus. It describes a system using multiple booster transformers connected in series, with each transformer's primary connected to a single voltage regulator through switching means. This allows a single regulator to control voltage over a wide range by sequentially activating the boosters. The switching is designed to occur at near-zero voltage differences to minimize issues.
The document summarizes a vertical deflection booster integrated circuit. It can handle flyback voltages up to 90V and provides up to 2.6A of output current. It has thermal protection and can operate with power supply voltages up to 42V. The document includes application examples, electrical specifications, and packaging details.
The BA6191 is a 2-channel motor driver IC that can be used in applications like CD players. It has four operating modes - forward, reverse, stop, and brake - that are selected by two control logic inputs. It uses a negative power supply and has protections like thermal shutdown and power supply voltage drop muting. The IC outputs a voltage twice the reference voltage in forward and reverse modes and stops output or brakes in the other modes.
This document provides an installation and adjustments manual for a Power Factor Controller (PFC3) that is designed to control the power factor and reactive current of a generator running in parallel with the main electrical grid. It describes the various operating modes and safety features of the PFC3, including power factor control, reactive current control, generator current limiting, low excitation limiting, and voltage matching. The document also covers installation, commissioning, user controls, operation, troubleshooting and specifications.
Automatic voltage regulations And V curves of alternatorsMUDASSARHABIB5
This document discusses automatic voltage regulation and V-curves in alternators. It begins by defining voltage regulation as the change in terminal voltage from no-load to full-load conditions. It then describes different types of voltage regulators, including manual and automatic voltage regulators. For automatic voltage regulators, it discusses the components, circuit concept, and functions of electronic voltage regulators. Finally, it explains V-curves, which plot the variation of armature current with changes in field current, and describes the three stages of under excitation, normal excitation, and over excitation.
The MC/MF Series mounting cards are designed to host up to three AMC 10A8 servo amplifier modules. The cards provide power and signal connections to the amplifiers and include potentiometers for configuring inputs, outputs, gains and limits. Models beginning with MC host amplifiers only, while MF models also include onboard filters on the motor lines. The document provides details on configuration, tuning and specifications for the mounting cards.
The MC/MF Series mounting cards are designed to host up to three AMC 10A8 servo amplifier modules. The cards provide power and signal connections to the amplifiers and include potentiometers for configuring inputs, outputs, gains and limits. Models beginning with MC host amplifiers only, while MF models also include onboard filters on the motor lines. The document provides details on configuration, tuning and specifications for the mounting card series.
The MC/MF Series mounting cards are designed to host up to three AMC 10A8 servo amplifier modules. The cards provide power and signal connections to the amplifiers and include potentiometers for configuring inputs, outputs, gains and limits. Models beginning with MC host amplifiers only, while MF models also include onboard filters on the motor lines. The document provides details on configuration, tuning and specifications for the mounting card series.
CÔNG TY CỔ PHẦN THIẾT BỊ ĐIỆN HOÀNG PHƯƠNG
Địa chỉ: Số 10, ngõ 44, phố Võ Thị Sáu, P.Thanh Nhàn, Q.Hai Bà Trưng, TP. Hà Nội
MST: 0106798886
Điện thoại: 024.3215.1322
Website : Hoangphuongjsc.com
Phone/Zalo : 0944 240 317 / Kinhdoanh1.hpe@gmail.com
Phone/Zalo : 0975 123 698 / Kinhdoanh2.hpe@gmail.com
Phone/Zalo : 0961 008 858 / Kinhdoanh3.hpe@gmail.com
1. The document discusses the Southern Grid which transmits power across five states in Southern India.
2. It has an installed capacity of 50,164 MW from various sources including thermal, hydro, gas etc. distributed across states.
3. The grid ensures stability through interconnected regional grids using HVDC links and maintains frequency, voltage levels through mechanisms like AGC, reactive power support etc.
The GPU 1500/40 is a hand-portable ground power unit that provides 28V DC power. It has a 40 amp continuous output and can recharge its internal batteries in 20 minutes to provide power for small to medium turboprop aircraft and helicopters. The unit is 300mm tall, 400mm long, 135mm wide and weighs 26kg. It has a digital display, independent 20 amp power modules for redundancy, a 10 amp accessory socket, and can be coupled to another unit for additional power capacity. The GPU 1500/40 has been widely used since 2001 by military and civilian operators worldwide to start aircraft engines.
The BA6219B and BA6219BFP-Y are reversible motor driver ICs suitable for brush motors. They have two logic inputs that allow four output modes: forward, reverse, idling, and braking. The motor speed can be set arbitrarily by controlling the voltage applied to the motor. Key features include a large output current, thermal shutdown protection, and pins to set the output voltage. Application examples are provided.
The document describes the S30A series of three-phase brushless servo amplifiers manufactured by Electromate. The amplifiers are small surface-mount devices that provide sinusoidal drive and current control to three-phase brushless motors. They require two sinusoidal command signals with 120 degree phase shift for external commutation and control motor torque based on signal amplitude. The amplifiers protect the motor from over-voltage, under-voltage, over-current, over-heating and short-circuits.
The document describes the S30A series of three-phase brushless servo amplifiers manufactured by Electromate. The amplifiers are small surface-mount devices that provide sinusoidal drive and current control to three-phase brushless motors. They require two sinusoidal command signals with 120 degree phase shift for external commutation and control motor torque based on signal amplitude. The amplifiers protect the motor from over-voltage, under-voltage, over-current, over-heating and short-circuits.
The document describes Thor Power Corporation's Trezium power system. The system consists of a patented microelectronic power converter and permanent magnet power unit called Grismir. The power converter uses vector control for high efficiency and torque control. Grismir is a brushless, slotless, sensorless AC motor that can operate as a motor, generator, or alternator with over 90% efficiency. The Trezium system provides benefits like universality, high efficiency, compact size, and wide input voltage range.
This document describes a patent application for an airplane stabilizer. It proposes lowering a weighted device below the airplane to displace the center of gravity downward, increasing stability. This creates a restoring moment when the plane rolls or tips that rights the plane. The stabilizer can be raised for normal flight and lowered during takeoffs, landings, or bad weather to improve safety by reducing the risk of stalling or capsizing due to loss of stability.
Este documento presenta las unidades didácticas de un módulo de sensibilización ambiental. Cubre conceptos generales como medio ambiente, ecologismo y desarrollo sostenible, así como conceptos de ecología, recursos naturales, orígenes de problemas ambientales y soluciones posibles. También incluye una unidad sobre educación ambiental y la responsabilidad humana, así como códigos de buenas prácticas.
This document describes a machine for electric machining of conductive materials. It uses a servo-mechanism to control the distance between an electrode tool and the workpiece. The improved servo-mechanism uses an electromagnetic device tapped into the average voltage between the electrode and workpiece. This controls a hydraulic distributor and hydraulic system to shift the electrode position in response to changes in the voltage gap. It allows for very precise and rapid control of the electrode distance during machining.
The document provides information about Allyis, a technology consulting firm with expertise in SharePoint, including their capabilities, engagement models, and case studies. It summarizes three case studies: implementing external user account management for client collaboration, using Remote Blob Storage for large file storage, and accessing external data using Business Connectivity Services. The document is intended to demonstrate Allyis's services and solutions for SharePoint projects.
This document describes a patent filing for an improved clamping device. The clamping device comprises two bifurcated members that can be secured together in different relative positions using a connecting screw. One member has a strip or rail that extends beyond its face to prevent any relative rotation between the members when secured. The arrangement allows the two members to be applied to each other or to a flat surface in multiple positions while ensuring the screw holes align for tightening. This provides a clamp that can firmly support a shelf or panel in various selected positions relative to a support.
This document describes improvements to a fluid mixing device that maintains the temperature of a fluid mixture. The device comprises an adjustable valve with a hollow liner and rotatable sleeve that have radial ports to supply and mix two fluid streams. The sleeve is rotated by a thermally sensitive unit to control the proportions of the streams and maintain the mixture at a predetermined temperature. The valve can be dismantled without damaging the unit and ensures correct reassembly. The device provides close temperature control even at low flow rates in an economical and compact design.
Biến tần trung thế ứng dụng trong công nghiệp cho các ngành như: Xi măng, nước, khai thác mỏ, sắt thép, nhà máy điện hóa chất, … Thiết bị giảm đáng kể dòng hài trên nguồn điện, độ tin cậy cao và dễ dàng bảo trì.
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This document provides a description of patent GB780010 (A) for improvements to electrical follow-up systems. The system uses a magnetic amplifier to amplify an error signal modulated at a sub-carrier frequency, which helps eliminate effects of datum instability in the amplifier. It then applies the amplified signal to a motor to reduce the error signal to zero and correctly indicate the measured value, such as liquid level.
This document provides a description of patent GB780010 (A) for improvements to electrical follow-up systems. The system uses a magnetic amplifier to amplify an error signal modulated at a sub-carrier frequency to reduce effects of datum instability. It applies the amplified error signal to a motor that operates to reduce the error signal to zero and correctly indicate liquid quantity in a gauge. Key aspects include modulating the error signal at a sub-carrier frequency, using negative feedback to keep the amplifier linear, and applying the amplified signal to a motor in a way that only sub-carrier modulation produces motion.
This document provides a description of patent GB780010 (A) from 1957 regarding improvements to electrical follow-up systems. The system uses a magnetic amplifier to amplify an error signal modulated at a sub-carrier frequency to reduce effects of datum instability. It applies the system to a liquid contents gauge using capacitors, with the output from the magnetic amplifier applied to a motor to adjust the measured liquid level to match the actual level.
This document summarizes research on controlling a doubly-fed induction generator (DFIG) for variable-speed wind power generation. A DFIG allows power production at a constant voltage and frequency while the rotor speed varies, making it suitable for wind power applications. The control scheme uses stator flux orientation for the rotor side converter and grid voltage vector control for the grid side converter. Simulation and laboratory tests were performed to validate the control approach under different wind conditions.
This document describes an experiment on operating a synchronous generator alone. It discusses the components and operating principles of synchronous generators, including how voltage is induced in the stator windings and how field excitation is supplied. It also covers armature reaction effects under different load power factors and the use of an automatic voltage regulator to maintain constant output voltage as the load changes. Graphs are presented showing the relationships between voltage, current, power and other variables. Generator ratings considering limits of field current and heating are also discussed.
USE OF ARNO CONVERTER AND MOTOR-GENERATOR SET TO CONVERT A SINGLE-PHASE AC SU...IAEME Publication
This method is used to control the speed of a three-phase induction motor by using a three-phase to three-phase cycloconverter from a single-phase supply and to compare the use of ARNO converter and motor-generator set to convert a single-phase supply to a three-phase supply. ARNO converter is a rotating device which convert single-phase AC to three-phase AC. The three-phase supply needed for the three-phase induction motors which used in blowers, exhausters an oil pumps. A motor-generator set is a device for converting electrical power to another form. They are used to convert frequency, voltage or phase of power. Thus, both ARNO converter and motor-generator set have been used here one at a time to convert a single-phase AC supply to three-phase AC. Both have their own advantages and disadvantages
Welcome to International Journal of Engineering Research and Development (IJERD)IJERD Editor
This document is a research paper that analyzes simulation of protection for huge hydro generators from short circuit faults. It presents the mathematical model of the excitation system and automatic voltage regulator (AVR) using PID control. The paper establishes a simulation model of a single machine infinite bus system in Matlab/Simulink. Simulation results are presented for different types of short circuit faults, including LL, LLLG, and LG faults. The results analyze the impact of faults on the generator terminal voltage, excitation voltage, electromagnetic torque, and speed. The paper concludes the excitation regulator can restore stability rapidly after faults are removed.
The document discusses upgrading an Elektra-Faurandau motor control system by implementing variable frequency drive (VFD) technology. It describes the working principles of the existing Elektra-Faurandau motor and identifies issues with it like commutator sparking and overheating. It proposes replacing the motor with an induction motor for improved efficiency and reliability. Implementing VFD controllers would allow variable speed control of the induction motors while reducing starting current and mitigating issues on the electrical supply network. The document provides details on selecting VFD parameters for different applications like pumps and extruders to optimize performance and protection.
This document describes an improved speed controlling system for polyphase commutator motors. It aims to provide a motor that has both series and shunt characteristics, allowing it to operate at a wide speed range. This is achieved by connecting the primary winding of an intermediate transformer in series or parallel with the motor windings. In series connection, the motor operates as a typical series motor. In parallel connection, voltage is supplied to the rotor to make it run as a shunt motor. This allows the motor to hoist light loads at high or low speeds, as well as lower loads at an adequate speed through regenerative braking. Diagrams and characteristics curves are provided to illustrate how switching connections achieves variable speed control.
Synchronous generators are the majority source of commercial electrical energy. They are commonly used to convert the mechanical power output of steam turbines, gas turbines, reciprocating engines and hydro turbines into electrical power for the grid.
MUTUAL EFFECT BETWEEN LFC AND AVR LOOPS IN POWER PLANTelelijjournal
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780009
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Description: GB780009 (A) ? 1957-07-31
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Improvements relating to regulating systems for dynamo-electric machines
Description of GB780009 (A)
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The EPO does not accept any responsibility for the accuracy of data
and information originating from other authorities than the EPO; in
particular, the EPO does not guarantee that they are complete,
up-to-date or fit for specific purposes.
PATENT SPECIFICATION
Inventor: NiORIMIAN HOARRY 1SHAW Date of filing Complete
Specification: June 10, 1955.
Application Date: June 16, 1954.
No. 17726/54.
1 --Complete Specification Published: July 31, 1957.
Index at acceptance:-Class 38(4), R(4: 21A1A).
3. International Classification:-G05f.
- COM1PLETE SPECOIFlICATION Improvements relating to Regulating
Systems for DynamoElectric Machines We, THE ENGLISH ELECTRIC COMPANY
LIMITED, of Queens House, 2!8 Kingsway, London, W.C.2, a British
Company, do hereby declare the invention, for which we pray that a
patent may be granted to us,.and the method by which it is to be
performed, to be particularly described in and by 'the following
statement:This invention, relates to regulating systems for
synchronous generators of the kind including an automatic voltage
regulator arranged to control the excitation of the generator
automatically so, as to maintain the output voltage of the generator
substantially constant.
It is well known that in such systems the synchronising torque of the
generator may, under certain conditions, fall below that necessary to
maintain the generator in synchronism with the system to which it is
connected., This loss of synchronising torque may be due, for example,
to the action of the automatic voltage regulator which, in attempting
to maintain the generator output voltage constant with sudden loss of
load, reduces the generator excitation belbw the stability limit.
One object of the present invention is to provide an improved
regulating system which incorporates means for automatically
preventing reduction of the generator excitation below the stability
limit.
According to the invention, in a regulating system for a synchronous
generator of the kind including an automatic voltage regulator
arranged to control the generator excitation automatically in, a sense
to maintain a generator output voltage substantially constant,
overriding automatic control means are 'arranged' to prevent reduction
of generator excitation below.a value determined solely by the
magnitude of the generator load current, which value increases with
the magnitude of the generator load current and' vice versa.
According to a preferred feature of the invention the overriding
control means are arranged to respond to electrical quantities varying
with generator excitation and the [Price 3s. 6fCiet' 4sCo magnitude of
the generator load current respectively, and to boost the generator
excitation automatically if the excitation should fall below a value
determined by the actual magnitude of the generator load current or if
the magnitude of the generator load current should exceed a value
determined by the actual value of generator excitation.
According to 'a further preferred feature of the invention the
overriding control means are arranged to boost the excitation of the
generator by applying an overriding control quantity to the automatic
voltage regulator in, a sense to cause the regulator to increase the
generator excitation.
{According to yet another preferred feature of the invention the
automatic voltage regulator comprises a magnetic amplifier having an
output winding connected in circuit with excitation varying means for
the generator and a control winding connected in a comparison circuit
consisting of a substantially constant electrical reference source and
an electric control source varying with generator output voltage, so
as to be energised in 'a corrective sense in accordance with variation
of generator output voltage from a predetermined value, said
overriding control means being arranged to boost the generator
excitation by injecting an electrical quantity into said comparision
circuit.
Other preferred features of the invention will appear from. the
follovwing description with reference to the drawing accompanying the
Provisional Specification which shows the simplified circuit diagram
of a regulating system for a turbo generator embodying the invention
in preferred form., Referring now to the drawing the generator G
supplies the three phase system busbars S through a step-up
transformer T1, the field winding Gf of the generator being supplied,
from an exciter E having a self-excited field winding Esf and a
control field winding arranged in two mutually opposing sections Ecf.1
4. and cf'2.. The self-excited field winding Esf is connected in circuit
with a motor 780,009 operated rheostat MR which is remotely controlled
through means, not shown, to provide alternative hand control of the
generator output voltage, whilst the two sections Ecfl, Ecf2 of the
control field winding 'are supplied from a magnetic amplifier MA1
having a control winding MA.lc.
The control winding of the magnetic amplifier MA1i is connected across
the output terminals OT of a comparison circuit which is arranged to
compare a voltage dependent on the average of the generator line
voltages with a voltage drop due to a constant reference current
flowing through resistors. The circuit comprises, in series
relationship, a constant current reference source IR, the star
connected secondary winding of a transformer T2, dry plate rectifiers
DR1, loading resistors R1 and R2, and a variable resistor VR1. The
delta-connected primary winding of the transformer T2 is supplied from
the generator G through a transformer T3 having a star-connected
primary winding and a delta-connected secondary winding. The rectified
output voltage of the transformer T2 is thus dependent on the average
of the generator line voltages.
In operation, the variable resistor VR1 is set so that, at the desired
generator output voltage, the total voltage drop across the resistors
R1, R2 and VR1 is substantially equal in magnitude and opposite in
polarity to the voltage output derived from the rectifiers DR1. Under
these conditions no potential difference will appear across the output
terminals OT of the comparison circuit, and, the control winding MAlc
of the magnetic amplifier MA1i will not be energized.
If now the generator output voltage should rise, then since the
current in the comparison circuit, and thus the voltage drop across
the three resistors therein, is maintained constant, a potential
difference will be developed across the output terminals OT which will
result in the energization of the control winding MAlc of the magnetic
amplifier MA&.
The magnetic amplifier is arranged so that when its control winding is
energized in this way the amplifier develops an output which is
applied to the section Ecfl of the control winding on the exciter so
as to buck the selfexcited winding Esf. The excitation of the
generator G, and thus its output voltage, will accordingly be reduced
until a balanced condition is restored at which just sufficient
potential difference is maintained across the output terminals OT of
the comparison, circuit to provide sufficient energization of the
section Ecfl of the control winding on the exciter E.
On the other hand, if the generator line volts should fall, a
potential difference of opposite polarity will be developed across the
output terminals OT of the comparison circuit with a consequent
energization in the opposite sense of the control winding MAlc of the
magnetic amplifier MAl. Under these conditions the magnetic amplifier
energizes the section Ecf2 of the control winding on the exciter E in
a sense to boost the self-excited winding Esf and thereby increase the
generator output volts until a balanced condition 70 is once more
restored.
In order to prevent loss of synchronism a voltage is applied
automatically across the resistor R2 in a sense to cause the generator
voltage to rise suddenly if the stability limit 75 is approached. This
voltage is derived from a magnetic amplifier MIA2 and is applied to
the resistor R2 through a rectifier DR2.
The magnetic amplifier has three control windings MA2a, MA2b and MA2c
respectively. Winding MA2a is energized from the comparison circuit in
accordance with the rectified output from the transformer T2, i.e. in
accordance with the average of the generator line voltages, a variable
resistor VR2 being 85 included in circuit with this winding. Winding
MA2b is energized through a rectifier bridge RB from a current
transformer IT in one line of the generator load circuit, i.e.
in accordance with generator load current. 90 Smoothing circuits may
be provided for smoothing the D.C. output of the rectifier.
5. Winding MA2c is connected in series with a variable resistor VR3
across a resistor R3 in the excitation circuit of the generator G so
as 95 to be energized in accordance with generator excitation.
Windings MA2a and MA2c, as shown by the small arrows, act in the same
direction whilst winding MA2b opposes these two windings. 100 The
variable resistors VR2 and VR3 are preset so that, provided the
generator load current does not exceed a limit value which varies with
the generator excitation, increasing with increase thereof, the
winding MA2b 105 will be overcome by the combined effect of the
windings MA2a and MA2c and the magnetic amplifier MA2 will be biased
back to minimum output. Under these conditions the rectifier DR2 will
prevent the flow of reverse 110 current which would otherwise occur as
a result of the normal voltage drop across the resistor R2 due to the
constant circulating current being greater than the output current
from the magnetic amplifier MA2. The magnetic amplifier therefore has
no effect on the operation of the comparison circuit.
If, however, the generator load current should exceed such a value
that the winding MA2b overcomes the combined effect of the 120
windings MA2a and MA2c, the magnetic amplifier will develop a
comparatively large voltage, causing a current to flow in the forward
direction through the rectifier DR2 which will increase the voltage
across the resistor R2. A potential difference will therefore be
developed across the output terminals OT of the comparison circuit
which will cause the magnetic amplifier MA1 to energize the boost
winding Ecf2 of the exciter E. The excitation 130 q780,009 sense to
cause the regulator to increase the generator excitation.
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6. Winding MA2c is connected in series with a variable resistor VR3
across a resistor R3 in the excitation circuit of the generator G so
as 95 to be energized in accordance with generator excitation.
Windings MA2a and MA2c, as shown by the small arrows, act in the same
direction whilst winding MA2b opposes these two windings. 100 The
variable resistors VR2 and VR3 are preset so that, provided the
generator load current does not exceed a limit value which varies with
the generator excitation, increasing with increase thereof, the
winding MA2b 105 will be overcome by the combined effect of the
windings MA2a and MA2c and the magnetic amplifier MA2 will be biased
back to minimum output. Under these conditions the rectifier DR2 will
prevent the flow of reverse 110 current which would otherwise occur as
a result of the normal voltage drop across the resistor R2 due to the
constant circulating current being greater than the output current
from the magnetic amplifier MA2. The magnetic amplifier therefore has
no effect on the operation of the comparison circuit.
If, however, the generator load current should exceed such a value
that the winding MA2b overcomes the combined effect of the 120
windings MA2a and MA2c, the magnetic amplifier will develop a
comparatively large voltage, causing a current to flow in the forward
direction through the rectifier DR2 which will increase the voltage
across the resistor R2. A potential difference will therefore be
developed across the output terminals OT of the comparison circuit
which will cause the magnetic amplifier MA1 to energize the boost
winding Ecf2 of the exciter E. The excitation 130 q780,009 sense to
cause the regulator to increase the generator excitation.
* Sitemap
* Accessibility
* Legal notice
* Terms of use
* Last updated: 08.04.2015
* Worldwide Database
* 5.8.23.4; 93p