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Related Concept Videos

Pilot and Numeric Relaying01:21

Pilot and Numeric Relaying

171
Pilot relaying is a type of differential protection used in power systems. It compares electrical quantities at the terminals of equipment via a communication channel instead of direct relay interconnection. This method is essential for transmission lines where the terminals are far apart, typically up to 80 km for lines with 69 to 115 kV ratings. Four types of communication channels are used for pilot relaying:
171
Overcurrent Relays01:26

Overcurrent Relays

181
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...
181
Line Protection with Impedance Relays01:27

Line Protection with Impedance Relays

157
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...
157
Reclosers and Fuses01:26

Reclosers and Fuses

193
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...
193
Distribution Reliability and Automation01:25

Distribution Reliability and Automation

183
Distribution reliability in electrical power systems is critical for ensuring an uninterrupted power supply to consumers at minimal cost. According to IEEE Standard Terms, reliability is the probability that a device will function without failure over a specified time period or amount of usage. For electric power distribution, this translates to maintaining continuous power supply and addressing customer concerns over power outages. Several indices, as defined by IEEE Standard 1366-2012, are...
183
Directional Relays01:25

Directional Relays

255
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...
255

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A security technology of power relay using edge computing.

Zhongqing Sang1, Kai Yang1, Rencheng Zhang1

  • 1Key Laboratory of Process Monitoring and System Optimization for Mechanical and Electrical Equipment (Huaqiao University), Fujian Province University, Xiamen City, China.

Plos One
|September 2, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces an edge computing strategy combined with an optimized simulated annealing algorithm (OSAA) for intelligent substation safety relay protection. The innovative model significantly reduces computing time for relay fault traveling waves, enhancing substation safety.

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Area of Science:

  • Electrical Engineering
  • Computer Science
  • Power Systems

Background:

  • Intelligent substations require advanced safety relay protection techniques.
  • Edge computing offers potential for real-time data processing in power systems.

Purpose of the Study:

  • To identify suitable safety relay protection techniques for intelligent substations.
  • To evaluate the applicability of edge computing in relay protection.

Main Methods:

  • An edge computing strategy combining edge computing and optimized simulated annealing algorithm (OSAA) was developed.
  • An edge computing model based on relay fault traveling waves was proposed.

Main Results:

  • The OSAA converged within approximately 1,100 iterations, demonstrating efficient computation.
  • The proposed model achieved a global optimal time delay of 0.5295 with a computing time of 456.27s, outperforming linear search.
  • Simulated fault waveforms matched actual situations, validating the model's accuracy.

Conclusions:

  • The developed edge computing model significantly reduces computing time for intelligent substation relay protection.
  • This approach enhances the safety and efficiency of power relay operations.
  • The model serves as a valuable reference for optimizing intelligent substation relay protection systems.