The document discusses transformer ratings, efficiency, and power factor. It explains that transformers are rated in kVA rather than kW because manufacturers do not know the load power factor in advance. Maximum efficiency occurs when iron losses equal copper losses. Transformer efficiency is calculated based on output power in watts rather than volt-amperes. Low power factor reduces efficiency by decreasing the output power relative to losses. Correcting power factor can help increase efficiency when a transformer is overloaded.
A synchronous motor is electrically identical with an alternator or AC generator.
A given alternator ( or synchronous machine) can be used as a motor, when driven electrically.
Some characteristic features of a synchronous motor are as follows:
1. It runs either at synchronous speed or not at all i.e. while running it maintains a constant speed. The only way to change its speed is to vary the supply frequency (because NS=120f/P).
2. It is not inherently self-starting. It has to be run up to synchronous (or near synchronous) speed by some means, before it can be synchronized to the supply.
3. It is capable of being operated under a wide range of power factors, both lagging and leading. Hence, it can be used for power correction purposes, in addition to supplying torque to drive loads.
To turn on a Thyristor, there are various triggering methods in which a trigger pulse is applied at its Gate terminal. Similarly, there are various techniques to turn off a Thyristor, these techniques are called Thyristor Commutation Techniques.
Transformer types core, shell, toroidal. steps to design a EI core type transformer by calculating tongue width, stack height etc and two examples are given
Distribution System Voltage Drop and Power Loss CalculationAmeen San
Distribution System Voltage Drop and Power Loss
Calculation
Comparison of Overhead Versus Underground System
Power Loss Calculation,Voltage Drop Calculation
Improvement of Load Power Factor by Using CapacitorIOSRJEEE
Series and parallel capacitors in the power system effect reactive power to improve power factor and voltage because of increasing the system capacity and reducing losses. Reactive power of series capacitor is the same to the current. There are certain unpleasant aspects in the capacitor series. Generally, the cost to install a series capacitor is higher than parallel capacitor. It is caused by complex protection equipment for series capacitor and designing series capacitors for greater power than parallel capacitor to solve the future cost. Installation of capacitors is important to reduce of a system reactive power. Transmission line would be most economical if it is used to send active power where the need of reactive power can be obtained by distribution system in substation level. This will allow user in optimum transmission line, improve operational performance and reduce energy losses. It requires a system and planning carefully to fulfill the need of system reactive power in the same way with active power planning and it is programmed an additional generator capacity.
A synchronous motor is electrically identical with an alternator or AC generator.
A given alternator ( or synchronous machine) can be used as a motor, when driven electrically.
Some characteristic features of a synchronous motor are as follows:
1. It runs either at synchronous speed or not at all i.e. while running it maintains a constant speed. The only way to change its speed is to vary the supply frequency (because NS=120f/P).
2. It is not inherently self-starting. It has to be run up to synchronous (or near synchronous) speed by some means, before it can be synchronized to the supply.
3. It is capable of being operated under a wide range of power factors, both lagging and leading. Hence, it can be used for power correction purposes, in addition to supplying torque to drive loads.
To turn on a Thyristor, there are various triggering methods in which a trigger pulse is applied at its Gate terminal. Similarly, there are various techniques to turn off a Thyristor, these techniques are called Thyristor Commutation Techniques.
Transformer types core, shell, toroidal. steps to design a EI core type transformer by calculating tongue width, stack height etc and two examples are given
Distribution System Voltage Drop and Power Loss CalculationAmeen San
Distribution System Voltage Drop and Power Loss
Calculation
Comparison of Overhead Versus Underground System
Power Loss Calculation,Voltage Drop Calculation
Improvement of Load Power Factor by Using CapacitorIOSRJEEE
Series and parallel capacitors in the power system effect reactive power to improve power factor and voltage because of increasing the system capacity and reducing losses. Reactive power of series capacitor is the same to the current. There are certain unpleasant aspects in the capacitor series. Generally, the cost to install a series capacitor is higher than parallel capacitor. It is caused by complex protection equipment for series capacitor and designing series capacitors for greater power than parallel capacitor to solve the future cost. Installation of capacitors is important to reduce of a system reactive power. Transmission line would be most economical if it is used to send active power where the need of reactive power can be obtained by distribution system in substation level. This will allow user in optimum transmission line, improve operational performance and reduce energy losses. It requires a system and planning carefully to fulfill the need of system reactive power in the same way with active power planning and it is programmed an additional generator capacity.
Micro-controller based Automatic Power Factor Correction System ReportTheory to Practical
This project report represents one of the most effective automatic power factor improvements by using static capacitors which will be controlled by a Microcontroller with very low cost although many existing systems are present which are expensive and difficult to manufacture. In this study, many small rating capacitors are connected in parallel and a reference power factor is set as standard value into the microcontroller IC. Suitable number of static capacitors is automatically connected according to the instruction of the microcontroller to improve the power factor close to unity. Some tricks such as using resistors instead of potential transformer and using one of the most low cost microcontroller IC (ATmega8) which also reduce programming complexity that make it one of the most economical system than any other controlling system.
AC Distribution in Bangladesh (in a nutshell)Ridwanul Hoque
Power System is an integrated network that interconnects the installations for generation, transmission and distribution of electricity. In Bangladesh electricity is generated at 50 Hertz frequency and at a nominal voltage of 11 KV (Kilo Volts) or 15 KV to be stepped up through transformers to 132 kV or 230 kV for feeding to the grid i.e. a high voltage transmission network that transmits the power to grid substation transformers to be stepped down at 33 kV. 11 kV and 0.4 kV for delivery to the consumers of various categories.
In electronics, impedance matching is the practice of designing the input impedance of an electrical load or the output impedance of its corresponding signal source to maximize the power transfer or minimize signal reflection from the load.
Loadability of line is defined as the extent of load which can flow through the line without exceeding the limitations. Line Loadability is expressed in percentage of Surge Impedance Loading of line. The limiting factor for line loading are: thermal limit, voltage drop limit and steady state stability.
Equipment and Stability Constraints : System OperationRidwanul Hoque
There are two types of constraints which limit the capability of a power system: If the overloading exceeds limits, the equipment is tripped out by protection systems. b) Stability Constraints: A power system may not be able to cater to power flows beyond a certain point due to stability constraints.
A power system control is required to maintain a continuous balance between power generation and load demand. Load Frequency Controller and Automatic Voltage Regulator play an important role in maintaining constant frequency and voltage in order to ensure the reliability of electric power.
HVDC stands for high voltage direct current, a well-proven technology used to transmit electricity over long distances by overhead transmission lines or submarine cables. It is also used to interconnect separate power systems, where traditional alternating current (AC) connections cannot be used.
Hydro Power Plants capture the energy of falling water to generate electricity. A turbine converts the kinetic energy of falling water into mechanical energy. Then a generator converts the mechanical energy from the turbine into electrical energy.
There are three main types of conventional hydropower technologies: impoundment (dam), diversion, and pumped storage. Impoundment is the most common type of hydroelectric power plant. An impoundment facility, typically a large hydro-power system, uses a dam to store river water in a reservoir.
The Rankine cycle or Rankine Vapor Cycle is the process widely used by power plants such as coal-fired power plants or nuclear reactors. In this mechanism, a fuel is used to produce heat within a boiler, converting water into steam which then expands through a turbine producing useful work.
The steam-electric power station is a power station in which the electric generator is steam driven.
The steam-electric power station is a power station in which the electric generator is steam driven.
The Rankine cycle or Rankine Vapor Cycle is the process widely used by power plants such as coal-fired power plants or nuclear reactors. In this mechanism, a fuel is used to produce heat within a boiler, converting water into steam which then expands through a turbine producing useful work.
The aim of our presentation is to describe the AC Distribution system in Bangladesh.
Following are the focused points in terms of Bangladesh perspective:
1. Distribution Procedure
2. Primary and Secondary Distribution System
3. Distribution Substation
4. Distribution Companies
5. Distribution in both City and Rural Area
6. Distribution Loss
7. Protective Devices
8. User Variety
8. Billing Procedure
Power system stability is the ability of an electric power system, for a given initial operating condition, to regain a state of operating equilibrium after being subjected to a physical disturbance, with most system variables bounded so that practically the entire system remains intact.
Economic operation of power system. (i) One dealing with minimum cost of power production called Economic dispatch. (ii) Other dealing with minimum loss of the generated power delivery to the loads. For any specified load condition, economic dispatch (i) determines the power output of each plant.
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
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Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
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Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
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Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
2. Why Transformers are Rated in kVA, Not in kW?
Rating of a transformer or any electrical machine reflects its load carrying
capability without overheating. Core Losses of the transformer depends on
Voltage (V) and Copper losses ( I²R) depends on Current (A) which passes
through the transformer. That's why the rating of Transformer in kVA, not in
kW.
When a manufacturer makes a transformer, they have no idea of the type of
load that will be used & consequently they can only rate the device according
to its maximum current output that the conductors can safely carry (at unity
Power Factor) & the insulation rating of the conductors (voltage &
temperature). So the transformer is designed for rated voltage and rated
current. We can't predict the power factor while designing the machine,
because power factor depends upon the load which varies time to time.
That’s why the Transformer Rating is expressed in kVA, not in kW.
3. Regulation of a Transformer
The measure of how well a power transformer maintains constant
secondary voltage over a range of load currents is called the transformer’s
voltage regulation. It can be calculated from the following formula:
4. As the transformer is loaded, the secondary terminal voltage falls (for a
lagging p.f.). Hence, to keep the output voltage constant, the primary
voltage must be increased. Suppose primary voltage has to be raised from
its rated value 𝑉1 to 𝑉1 ’, then
5. Problem: A 250/500-V transformer gave the following test results :
OC test : 250 V, 1 A, 80 W on low-voltage side.
SC test : with low-voltage winding short-circuited :20 V; 12 A, 100 W .
Determine the equivalent circuit parameters and insert them on the equivalent circuit
diagram and calculate the full load efficiency when the output is 10 A at 500 volt and
0.8 power factor lagging.
Solution. Open-circuit Test :
6. As 𝑅0 and 𝑋0 refer to primary, hence we will transfer these values to
primary with the help of transformation ratio
7.
8. Efficiency of a Transformer
Efficiency =
Output
Input
A better method is to determine the losses and then to calculate the
efficiency from ;
or
It may be noted here that efficiency is based on power output in watts and
not in volt-amperes, al- though losses are proportional to VA. Hence, at any
volt-ampere load, the efficiency depends on power factor, being maximum at
a power factor of unity.
9. Condition for Maximum Efficiency
Considering primary side,
or, η
….. (1)
Differentiating both sides of equation (1) with respect to 𝐼1, we get
10. Condition for Maximum Efficiency
….. (2)
For η to be maximum, Hence, the equation (2) becomes
or Iron loss = Cu loss
11. All- day Efficiency
The ordinary or commercial efficiency of a transformer is given by the ratio
But there are certain types of transformers whose performance cannot be
judged by this efficiency; distribution transformers have their primaries
energized all the twenty-four hours, although their secondaries supply little or
no-load much of the time during the day except during the house lighting
period. The performance of such is compared on the basis of energy consumed
during a certain time period, usually a day of 24 hours
12. Problem: A 10 kVA, 500/250 V, single-phase transformer gave the following test results:
S.C. Test (H.V. side) : 60 V, 20 A, 150 W
The maximum efficiency occurs at unity power factor and at 1.20 times full-load current.
Determine full-load efficiency at 0.80 p.f. Also calculate the maximum efficiency.
Solution. Full-load current on H.V. side = 10,000/500 = 20 Amp
S.C. test has been conducted from H.V. side only. Hence, at unity p.f. , full-load
copper-loss is = 150 watts
(a) Maximum efficiency occurs at 1.2 times of full-load current,
So, at unity p.f. corresponding copper loss is = (1.2)2
x 150 = 216 watts
At maximum efficiency, copper-loss = core-loss = 216 watts
Corresponding Power-output = 1.2 x 10,000 x 1.0 = 12 kW
Hence, maximum efficiency at unity P.f. = (12)/(12 + 0.216 + 0.2160) = 0.9653 = 96.53 %
13. Problem: A 10 kVA, 500/250 V, single-phase transformer gave the following test results:
S.C. Test (H.V. side) : 60 V, 20 A, 150 W
The maximum efficiency occurs at unity power factor and at 1.20 times full-load current.
Determine full-load efficiency at 0.80 p.f. Also calculate the maximum efficiency.
Solution
(b) Full-load efficiency at 0.80 P.f.
Output Power at full-load, 0.80 P.f. = 10,000 x 0.8 = 8000 W, constant core-loss = 216 W
Corresponding copper-loss = 150 W
Total losses = 366 W
Hence, efficiency = (8000/8366) x 100 % = 95.63 %.
15. Say our substation is loaded to the maximum transformer capacity and we know it is
delivering power at a poor power factor. Our options are:
1. unload the transformer by disconnecting loads from it,
2. buy a larger transformer,
3. provide additional cooling to it (this raises the transformer capacity) or
4. correct the power factor.
Power Factor (P.F.) is the ratio of Working Power to Apparent Power.
P.F. =
𝐾𝑊
𝐾𝑉𝐴
16. Lagging and Leading Power Factors:
In addition, there is also a difference between a lagging and leading power factor. A lagging
power factor signifies that the load is inductive, as the load will “consume” reactive power,
and therefore the reactive component Q is positive as reactive power travels through the
circuit and is “consumed” by the inductive load. A leading power factor signifies that the
load is capacitive, as the load “supplies” reactive power, and therefore the reactive
component Q is negative as reactive power is being supplied to the circuit.
If θ is the phase angle between the current and voltage, then the power factor is
equal to the cosine of the angle, :