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Related Concept Videos

Differential Relays01:20

Differential Relays

82
Differential relays are used to protect generators, buses, and transformers by comparing electrical quantities at different points. When a fault occurs, the difference in current between the two points triggers the relay to operate, opening the circuit breaker. Under normal conditions, the current entering (i1) and leaving (i2) a generator are equal. When a fault occurs, however, these currents become unequal, and the difference current flows in the relay operating coil, causing the relay to...
82
Reducing Line Loss01:18

Reducing Line Loss

130
In a three-phase circuit, line loss is an indicator of energy dissipated as heat due to the resistance of transmission lines. To address this, incorporating transformers into the system—a step-up transformer at the source and a step-down transformer at the load—is a strategic solution. Two three-phase transformers are introduced to improve this.
With a step-up transformer at the source, the voltage is increased, thereby reducing the current in the transmission lines since power loss...
130
Zones of Protection01:16

Zones of Protection

100
In power systems, the entire setup is divided into protective zones to isolate faults and protect the rest of the network. These zones include generators, transformers, buses, transmission lines, distribution lines, and motors. Each zone can be visualized as a separate room in a house, with each room protected by its own circuit breaker.
Protective zones are defined by closed dashed lines, containing one or more components. A key characteristic of these zones is the strategic placement of...
100
Energy Losses in Transformers01:21

Energy Losses in Transformers

800
In an ideal transformer, it is assumed that there are no energy losses, and, hence, all the power at the primary winding is transferred to the secondary winding. However, in reality,  the transformers always have some energy losses, and, hence, the output power obtained at the secondary winding is less than the input power at the primary winding due to energy losses.
There are four main reasons for energy losses in transformers.
The first cause can be  the high resistance of the...
800
Line Protection with Impedance Relays01:27

Line Protection with Impedance Relays

56
Coordinating time-delay overcurrent relays in complex radial systems and directional overcurrent relays in multi-source transmission loops can be challenging. Impedance relays address these issues by responding to the voltage-to-current ratio, specifically measuring the apparent impedance of a line. These relays become more sensitive during faults as current increases and voltage decreases, thereby reducing the apparent impedance.
Under normal conditions, low load currents keep the measured...
56
Radial System Protection01:23

Radial System Protection

83
Radial systems employ time-delay overcurrent relays to reduce load interruptions. When a fault occurs, the nearest breaker opens first, while upstream breakers remain closed due to longer delay settings. This approach ensures minimal disruption to the rest of the system.
In a radial system with a fault downstream of the third breaker, ideally, only the third breaker will open, isolating the fault and interrupting the load connected beyond it. The second breaker has a longer delay setting,...
83

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Related Experiment Video

Updated: May 10, 2025

Author Spotlight: Simulation and Analysis of the Temperature Rise of Ring Main Unit Equipment
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Improving the Protection of Step-Down Transformers by Utilizing Percentage Differential Protection and

Chia-Wei Huang1, Chih-Chiang Fang2, Wei-Tai Hsu1

  • 1Department of Electrical Engineering, Zhaoqing University, Zhaoqing 526061, China.

Entropy (Basel, Switzerland)
|April 26, 2025
PubMed
Summary

This study simulated transformer faults using software, developing a novel method to improve protection system accuracy and reduce misoperations. The scale-dependent intrinsic entropy method enhances power system reliability.

Keywords:
complexityfault diagnosispercentage differential protectionpower transformer

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Area of Science:

  • Electrical Engineering
  • Power Systems Engineering
  • Computational Engineering

Background:

  • Transformer operations are prone to internal and external faults, compromising power system stability.
  • Existing protection schemes may suffer from sensitivity issues, leading to misoperations.
  • Accurate fault analysis and reliable protection are crucial for power system integrity.

Purpose of the Study:

  • To develop and evaluate a software-based simulation model for analyzing transformer faults.
  • To investigate the effectiveness of percentage differential protection for transformers and transmission lines.
  • To introduce and validate the scale-dependent intrinsic entropy method for mitigating protection misoperations.

Main Methods:

  • Constructed a power system simulation model using software, featuring a step-down transformer with multiple tap positions.
  • Simulated internal transformer faults and external faults between the transformer and load.
  • Implemented percentage differential protection and the scale-dependent intrinsic entropy method for decision support.

Main Results:

  • The simulation model effectively analyzed internal and external transformer faults.
  • The scale-dependent intrinsic entropy method demonstrated effectiveness in minimizing protection device misoperations.
  • Comprehensive failure analysis confirmed the practicality of the proposed auxiliary method.

Conclusions:

  • The developed simulation model provides a practical platform for transformer fault analysis.
  • The scale-dependent intrinsic entropy method is a valuable tool for enhancing power system protection reliability.
  • This research contributes to improving the operational safety and stability of power systems.