Bus protection surge disturbance identification method and device and differential protection method and device

A technology of busbar protection and identification method, which is applied to emergency protection circuit devices, emergency protection data processing devices, and automatic disconnection emergency protection devices, etc. , the effect of simple algorithm

Active Publication Date: 2018-09-04
河南许继继保电气自动化有限公司 +3
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Problems solved by technology

[0007] The present invention provides a surge disturbance identification method and device for busbar protection and a differential protection method and device, which are used to solve the problem of large amount of computation in identifying surge disturbances in the prior art

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  • Bus protection surge disturbance identification method and device and differential protection method and device
  • Bus protection surge disturbance identification method and device and differential protection method and device
  • Bus protection surge disturbance identification method and device and differential protection method and device

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Embodiment Construction

[0040] The invention provides a surge disturbance identification method and device for busbar protection and a differential protection method and device, which are used to solve the problem of large amount of computation in identifying surge disturbances in the prior art.

[0041] To achieve the above object, the technical solution provided by the invention is:

[0042] A method for identifying surge disturbances on an in-situ busbar, comprising the following steps:

[0043] When there is a disturbance in the power system, the small difference differential current of each section of the busbar and each phase in the in-situ busbar protection system is sampled. The sampling period is less than the period of the small difference differential current. The number of samples per sampling period is the first setting value;

[0044] If the number of sampling points that satisfy the open criterion is not greater than the second set value among the sampling points of the small differen...

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Abstract

The invention provides a bus protection surge disturbance identification method and device and a differential protection method and device. The surge disturbance identification method comprises the following steps: when disturbance occurs in an electric power system, sampling each phase of small-difference differential current of each section of bus in an in-situ bus protection system, sampling period being smaller than the period of the small-difference differential current, and the number of sampling points in each sampling period being a first set value; and if the number of sampling points, meeting open criterion, in the sampling points of some phase of small-difference differential current is not larger than a second set value, judging that the disturbance occurring in the system is surge disturbance, wherein the condition that the sampling points meet the open criterion means that the small-difference differential current corresponding to the sampling points is larger than a third set value. According to the technical scheme, the method can judge whether the disturbance occurring in the in-situ system is the surge disturbance only by sampling the small-difference differentialcurrent within one period, is short in data extraction time and small in operation amount, and can solve the problem of large operation amount when carrying out surge disturbance identification.

Description

technical field [0001] The invention belongs to the technical field of on-site relay protection for electric power systems, and in particular relates to a bus protection surge disturbance identification method and device, and a differential protection method and device. Background technique [0002] Surge disturbance, also known as sudden wave disturbance, or shock lightning wave disturbance, is a severe shock pulse that occurs in only one millionth of a second. GB / T 17626.5-2008 "Electromagnetic Compatibility Test and Measurement Technology Surge (Shock) Immunity Test" stipulates related indicators such as wave front time and half-peak time for relay protection devices against surge disturbances, such as Figure 1a As shown; after the surge disturbance is filtered by the sampling link of the protection device, the identified disturbance waveform is only 1 to 2 sampling points, and the test waveform is as follows Figure 1b shown. Surge disturbances in power systems mainly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H02H7/22H02H1/00H02H3/32
CPCH02H1/0092H02H3/32H02H7/22H02H7/26
Inventor 王智勇邓茂军倪传坤樊占峰李宝伟程天保李旭黄继东马和科李文正赵应兵
Owner 河南许继继保电气自动化有限公司
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