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A Hierarchical Protection Method

A main protection and protection system technology, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as expansion of accidents, misoperation, and mismatch of backup protection action characteristics, and achieve the effect of improving work efficiency and avoiding the setting process.

Active Publication Date: 2020-09-25
GUANGDONG POWER GRID CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, with the expansion of the scale and the complexity of the structure of the modern power grid, the traditional relay protection that relies on local information has encountered many problems. In the prior art, the setting and coordination of the backup protection is difficult, and its setting and coordination are based on a fixed operation mode , when the grid structure and operation mode change frequently and greatly for some reason, it is easy to cause a mismatch in the action characteristics of the backup protection, which may cause misoperation or expand the accident

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0028] A hierarchical protection method, the flow chart of which is as follows figure 1 Shown: Include the following steps:

[0029] S1. Establish a hierarchical protection system;

[0030] S2. Determine whether the power system fails, if so, proceed to step S3, otherwise end the operation;

[0031] S3. The protection system responds to the fault, and if the action condition is satisfied, a trip signal is sent to the circuit breakers at both ends of the faulty component in the substation, otherwise, step S3 is repeated;

[0032] S4. After the protection system waits for the corresponding protection time, it detects whether the fault exists. If it is, after a delay, the protection system responds to the fault, generates a corresponding trip algorithm according to the fault location and topology, and then sends a trip signal to the substation;

[0033] S5. Based on step S4, continue to detect whether the fault exists, if so, then, after the time delay is passed again, a trippi...

Embodiment 2

[0046] If a fault occurs inside the substation, such as figure 2 Shown: After an internal fault occurs in substation A, the fast main protection at the faulty component, or the fast main protection in the station area and wide area acts, and sends a trip signal to the circuit breakers at both ends of the faulty component; if the main protection refuses to operate or the circuit breaker fails , A substation wide-area decision-making center formulates the corresponding circuit breaker tripping strategy according to the fault component location and topology information. If the fault is still not removed, the long-delay on-site backup protection action will send a trip signal to the circuit breakers at both ends of the faulty component. Specifically, if the internal transformer of substation A fails, the differential protection of the transformer as the main protection should first act and send a trip signal to the circuit breakers at both ends of the transformer. If the fault s...

Embodiment 3

[0048] If the adjacent substation loses voltage, such as image 3 Shown: The whole substation of A substation loses voltage, and the line connecting A-D breaks down. At this time, substation A cannot send information to the surrounding adjacent substations, and its fast main protection, station area and wide area protection based on multi-source information cannot operate, and the circuit breaker on the connected line cannot be tripped. The four substations in city B, city C, city D and city E cannot receive the information from substation A. After waiting for the substation area and wide area backup protection action time, the fault still exists, so the four substations have wide area delay The backup protection operates, and the four substations send a trip signal to the circuit breaker of the line connected to the A substation.

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Abstract

The invention relates to a hierarchical protection method, which comprises the following steps: firstly, establishing a hierarchical protection system, further judging whether a power system breaks down, then responding the fault by the protection system, detecting whether the fault exists after the protection system waits for corresponding protection time, if so, after time delay, responding thefault by the protection system, generating a corresponding tripping algorithm according to the fault position and a topological structure, and then sending a tripping signal to a transformer substation; further continuously detecting whether the fault exists or not, if so, sending the tripping signal to a circuit breaker on a line connected with an information-losing transformer substation when the adjacent transformer substation loses voltage after time delay again; and finally, after the protection action time of S1-S5, if the fault still exists, sending the tripping signals to the circuit breakers at two ends of the fault element after the action condition time delay is met, the fault is simply and orderly responded and removed by the hierarchical protection system, the complex settingprocess of the traditional backup protection is avoided, the action is effectively and reliably sent, and the working efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of circuit control, in particular to a hierarchical protection method. Background technique [0002] At present, with the expansion of the scale and complexity of the structure of the modern power grid, the traditional relay protection relying on local information has encountered many problems. In the existing technology, the setting and coordination of the backup protection is difficult, and its setting and coordination are based on a fixed operation mode , when the grid structure and operation mode change frequently and greatly for some reason, it is easy to cause a mismatch in the action characteristics of the backup protection, which may cause misoperation or expand the accident. Contents of the invention [0003] The present invention provides a layered protection method to solve one or more of the above-mentioned deficiencies. [0004] In order to solve the problems of the technologies described abo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/00
Inventor 王增超黄明辉段新辉刘玮曾耿晖李一泉王育学刘琨朱晓华梁博
Owner GUANGDONG POWER GRID CO LTD
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