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Directional Relays01:25

Directional Relays

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Directional relays, essential for managing unidirectional fault currents, enhance the safety and efficiency of power systems. On power lines equipped with directional relays, faults downstream (to the right) of the current transformer typically cause the fault current to lag the bus voltage by approximately 90 degrees, known as the forward direction. In contrast, upstream (left-side) faults may result in the fault current leading the bus voltage by nearly 90 degrees, termed the reverse...
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Line Protection with Impedance Relays01:27

Line Protection with Impedance Relays

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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...
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Overcurrent Relays01:26

Overcurrent Relays

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Overcurrent relays, crucial for circuit protection, are connected to the secondary current of a current transformer. There are two primary types of overcurrent relays: instantaneous and time-delay.
Instantaneous overcurrent relays activate immediately when the input current exceeds a predetermined value, known as the pickup current, instantly energizing the circuit breaker trip coil. This rapid response is vital for addressing severe faults quickly.
Time-delay overcurrent relays, on the other...
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Reclosers and Fuses01:26

Reclosers and Fuses

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Automatic circuit reclosers enhance the protection of distribution circuits by interrupting and auto-reclosing an AC circuit according to a preset sequence. They effectively manage temporary faults on overhead distribution lines, often caused by tree limbs or wildlife, by briefly disrupting service to improve overall reliability. However, contact with reclosers or energized broken conductors on the ground can pose serious hazards.
A comprehensive protection scheme for radial distribution...
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Radial System Protection01:23

Radial System Protection

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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,...
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Differential Relays01:20

Differential Relays

114
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...
114
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  1. Home
  3. Optimal Coordination Of Directional Overcurrent Relays In Power Energy Systems With Emphasis On The Discreteness Of Variables: Comprehensive Comparisons.
  1. Home
  3. Optimal Coordination Of Directional Overcurrent Relays In Power Energy Systems With Emphasis On The Discreteness Of Variables: Comprehensive Comparisons.

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Optimal coordination of directional overcurrent relays in power energy systems with emphasis on the discreteness of

Aram Bayazidi1, Ali Abdali2,3, Juan C Vasquez4

  • 1Faculty of Electrical and Computer Engineering, University of Tabriz, Tabriz, Iran.

Heliyon
|October 14, 2024

View abstract on PubMed

Summary
This summary is machine-generated.

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This study introduces a High Exploration Particle Swarm Optimization (HEPSO) algorithm to optimize overcurrent relay coordination in looped power networks, ensuring no miscoordination. The HEPSO algorithm demonstrates superior performance compared to other methods on standard test systems.

Area of Science:

  • Electrical Engineering
  • Power Systems Protection
  • Optimization Algorithms

Background:

  • Overcurrent relay coordination in looped networks is a complex, constrained problem.
  • Existing optimization algorithms may not achieve optimal solutions without miscoordination.
  • Accurate relay coordination is crucial for power system reliability.

Purpose of the Study:

  • To develop and validate an optimized approach for overcurrent relay coordination in looped networks.
  • To introduce a novel discretization method to prevent relay miscoordination.
  • To evaluate the effectiveness of the High Exploration Particle Swarm Optimization (HEPSO) algorithm.

Main Methods:

  • The High Exploration Particle Swarm Optimization (HEPSO) algorithm, incorporating genetic and bee colony mechanisms, was employed.
  • A new variable discretization approach was proposed to ensure coordination.
  • The Turbulent Flow of Water-based Optimization (TFWO) algorithm was used for validation.
  • Consideration of sub-transmission transformer outages for pickup current determination.
  • Testing on IEEE 14 and 30-bus systems.

    • Main Results:

    • The HEPSO algorithm achieved more optimal solutions compared to other metaheuristic, mathematical, and hybrid methods.
    • The proposed discretization method effectively prevented miscoordination.
    • The algorithm demonstrated robustness and efficiency on large-scale test systems.
    • Transformer outage considerations improved the practicality of pickup current settings.

    Conclusions:

    • The HEPSO algorithm is a powerful and robust tool for solving the constrained overcurrent relay coordination problem.
    • The novel discretization technique successfully prevents miscoordination in digital relays.
    • The proposed methods enhance the reliability and efficiency of power system protection schemes.