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Related Concept Videos

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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Reclosers and Fuses01:26

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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.
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Differential Relays01:20

Differential Relays

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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...
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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.
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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.
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Determining the subtransient fault current in a power system involves representing transformers by their leakage reactances, transmission lines by their equivalent series reactances, and synchronous machines as constant voltage sources behind their subtransient reactances. In this analysis, certain elements are excluded, such as winding resistances, series resistances, shunt admittances, delta-Y phase shifts, armature resistance, saturation, saliency, non-rotating impedance loads, and small...
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Relay Protection Device Reliability Assessment Through Radiation, Fault Injection and Fault Tree Analysis.

Hualiang Zhou1,2, Hao Yu3, Zhiyang Zou1,2

  • 1State Grid Electric Power Research Institute, NARI Group Corporation, Nanjing 211106, China.

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|January 25, 2025
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Summary
This summary is machine-generated.

This study assesses how alpha-particle-induced single event effects (SEEs) impact relay protection devices. It proposes a cost-effective reliability method for secondary equipment in electric power grids.

Keywords:
fault injectionfault tree analysisrelay protection devicesingle event upsetα-particle

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Area of Science:

  • Electrical Engineering
  • Nuclear Engineering
  • Reliability Engineering

Background:

  • Modern relay protection devices integrate advanced chips, introducing new vulnerabilities.
  • Single Event Effects (SEEs) from alpha-particles pose a risk to the continuous operation of secondary equipment.
  • System-level assessment of alpha-particle SEE impact on relay protection is currently limited.

Purpose of the Study:

  • To evaluate the impact of alpha-particle-induced SEEs on relay protection devices.
  • To develop a cost-effective reliability assessment method for secondary equipment considering SEEs.
  • To provide insights for enhancing the reliability of future electric power grid systems.

Main Methods:

  • Monte Carlo simulation to model SEE impact.
  • Verification through alpha-particle radiation experiments.
  • Fault injection and fault tree analysis for system-level assessment.
  • Analysis of soft error probability under different workload conditions.

Main Results:

  • Quantified the influence of SEEs on relay protection devices, both with and without hardening.
  • Evaluated soft error probabilities for general and specific application workloads.
  • Demonstrated the effectiveness of the proposed reliability assessment method.

Conclusions:

  • SEEs present a significant risk to the reliability of secondary equipment in power grids.
  • The developed Monte Carlo simulation and analysis framework offers a low-cost, effective reliability assessment.
  • Findings contribute to improving the resilience of future electric power systems against radiation-induced effects.