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Coordination method and system for local protection and regional protection of distribution network

A technology for area protection and distribution network, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve problems such as protection misoperation and refusal to operate, to prevent protection misoperation, prevent sneaky jumps or network attacks, and achieve high reliability Effect

Active Publication Date: 2019-01-01
XUJI GRP +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a coordination method and system for in-situ protection of distribution network and regional protection, to solve the problem of maloperation or refusal of protection due to improper coordination in the process of remote-in-situ protection

Method used

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  • Coordination method and system for local protection and regional protection of distribution network

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] When the local protection device includes a set of local protection and the area protection device includes a set of area protection, the setting conditions of the local tripping device include:

[0042] When the protection judgment signal flag value of local protection is c, it will trip directly;

[0043]When the protection judgment signal flag value of the local protection is b, and the protection judgment signal flag value of the current protection section III of the local protection is 1, wait for the set time, if the protection judgment of the area protection is received within the set time If the signal flag value is c, then trip;

[0044] When the protection judgment signal flag value of the local protection is b, and the protection judgment signal flag value of the current protection stage III of the local protection is 0, wait for the set time, if the protection judgment of the area protection is received within the set time If the signal flag value is c, the...

Embodiment 2

[0047] When the local protection device includes two sets of local protection and the area protection device includes one set of area protection, the setting conditions of the local tripping device include:

[0048] When the protection judgment signal flag values ​​of the two sets of local protection are both c, it will trip directly;

[0049] When the protection judgment signal flag value of the two sets of local protection is both b, and the protection judgment signal flag value of the current protection section III of the local protection is 1, wait for the set time, if the area protection is received within the set time If the value of the protection judgment signal flag is c, it will trip;

[0050] When the protection judgment signal flag values ​​of the two sets of local protection are both b, and the protection judgment signal flag value of the current protection section III of the local protection is 0, wait for the set time, if the area protection is received within t...

Embodiment 3

[0054] When the local protection device includes one set of local protection and the area protection device includes two sets of area protection, the setting conditions of the local tripping device include:

[0055] When the protection judgment signal flag value of the local protection is c, it waits for the set time, and if the protection judgment signal flag value of any set of area protection is received within the set time, it trips;

[0056] When the protection judgment signal flag value of the local protection is c, wait for the set time, if the protection judgment signal flag value of the area protection is not received within the set time, then trip;

[0057] When the protection judgment signal flag value of the local protection is c, then wait for the set time, if the protection judgment signal flag value of a set of area protection is received within the set time, then continue to wait for the set time, if within the set time If the protection judgment signal flag va...

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Abstract

The invention relates to the field of distribution network protection, and in particular to a cooperation method and system of in-situ protection and regional protection of a distribution network. According to the invention, a current protection III section of in-situ protection is arranged and a flag value of a signal is determined according to the protection thereof, so as to determine the qualification of cooperation of in-situ protection and regional protection, in this way, the in-situ protection can be prevented against the trip without fault or network attacks effectively, and meanwhile a comprehensive tripping cooperation scheme among the in-situ protection, the current protection III section of the in-situ protection and the regional protection is designed. The regional protection in the invention has high reliability by itself, can effectively prevent protection misoperation brought by the abnormality of remote transmission of sampling information, and can also accelerate the in-situ protection and identify a high-resistance ground fault that cannot be identified by the in-situ protection.

Description

technical field [0001] The invention relates to the field of distribution network protection, in particular to a method for coordinating distribution network local protection and regional protection and a system thereof. Background technique [0002] In the actual power grid, there may be certain deviations in the process of information transmission, data sorting, and decision-making module analysis, which may cause the local protection layer or the regional protection layer to issue wrong instructions, which will lead to protection refusal or protection malfunction. Situation happens. Protection refusal refers to the situation that when a fault occurs in the zone, the protection device does not detect the fault or the protection device has detected the fault and sends a trip command, but the circuit breaker does not act. A protective action occurs when a fault occurs. Both of these situations will lead to a reduction in the reliability of the relay protection system. The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
CPCH02H7/26
Inventor 郑灏王庆平薄志谦王林马凯琪金能
Owner XUJI GRP
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