Relay protection method and device

A technology of relay protection and relay, which is applied in the direction of emergency protection circuit devices, protection reacting to overcurrent, electrical components, etc., can solve problems affecting the reliability of relay protection, and achieve the goal of solving poor reliability and improving reliability Effect

Pending Publication Date: 2021-11-26
GUANGDONG POWER GRID CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the existing relay protection method usually calculates the setting value of the relay protection off-line. According to the calculated setting value, the relay protection device is used to protect the power system. During the operation of the power system, The setting value is rarely changed; and, when the setting value does not meet the actual relay protection requirements, it is usually necessary to manually modify the setting value many times, which affects the reliability of the relay protection

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0039] figure 1 It is a flow chart of a relay protection method provided by Embodiment 1 of the present invention. This embodiment is applicable to power system relay protection and other aspects. The method can be executed by a relay protection device, which can be implemented by software and / or or hardware, the device can be integrated with electronic equipment with relay protection functions such as computers, the method specifically includes the following steps:

[0040] Step 110, obtaining the maximum load current of the line, the voltage and current before the failure of the preset protection section in the line, and the fault voltage and fault current after the failure of the preset protection section.

[0041] Among them, the maximum load current of the line can be stored in the relay protection device in advance, the voltage and current before and after the failure of the preset protection section in the line can be collected by the voltage sensor and current sensor r...

Embodiment 2

[0048] figure 2It is a flowchart of a relay protection method provided by Embodiment 2 of the present invention. This embodiment is applicable to power system relay protection and other aspects. The method can be executed by a relay protection device, which can be implemented by software and / or or hardware, the device can be integrated with electronic equipment with relay protection functions such as computers, the method specifically includes the following steps:

[0049] Step 210, obtaining the maximum load current of the line, the voltage and current before the failure of the preset protection section in the line.

[0050] Among them, the maximum load current of the line can be stored in the relay protection device in advance, the voltage and current of the preset protection section in the line can be collected by the voltage sensor and the current sensor respectively, and the relay protection device can be electrically connected with the voltage sensor and the current sen...

Embodiment 3

[0086] Figure 4 It is a structural block diagram of a relay protection device provided in Embodiment 3 of the present invention, which includes a voltage and current acquisition module 310, an operating current determination module 320, and a state control module 330; wherein, the voltage and current acquisition module 310 is used to acquire the The maximum load current, the voltage and current before the failure of the preset protection section in the line, and the fault voltage and fault current after the failure of the preset protection section; the operating current determination module 320 is used to determine the voltage according to the preset protection section before failure and current, fault voltage and fault current, determine the tripping action current, and determine the overcurrent protection current according to the maximum load current; the state control module 330 is used to control the state of the relay in the line according to the fault current, tripping a...

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Abstract

The embodiment of the invention discloses a relay protection method and device. The relay protection method comprises the steps that the maximum load current of a line, the voltage and current of a preset protection road section in the line before a fault occurs, and the fault voltage and fault current of the preset protection road section after the fault occurs are acquired; according to the voltage and current of the preset protection road section before the fault, the fault voltage and the fault current, a tripping action current is determined, and an overcurrent protection current is determined according to the maximum load current; and the state of the relay in the circuit is controlled according to the fault current, the tripping action current and the overcurrent protection current. According to the relay protection method and device provided by the embodiment of the invention, the reliability of relay protection can be improved.

Description

technical field [0001] The embodiments of the present invention relate to relay protection technology, in particular to a relay protection method and device. Background technique [0002] In the power system, due to the complex operation mode of the power grid and the state of frequent changes, in order to ensure the safe and reliable operation of the power system, maintenance in daily use must be strengthened. The application of relay protection devices can avoid the risks caused by power system failures and maintain the safety of power equipment. As the power system has higher and higher requirements for fault troubleshooting and isolation, the performance requirements for relay protection devices are also higher and higher. [0003] At present, the existing relay protection method usually calculates the setting value of the relay protection off-line. According to the calculated setting value, the relay protection device is used to protect the power system. During the ope...

Claims

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Application Information

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IPC IPC(8): H02H7/26H02H3/08
CPCH02H7/26H02H3/08
Inventor 李俊鹏叶俊鸿伦卫军刘波江
Owner GUANGDONG POWER GRID CO LTD
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