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A method to prevent incorrect operation of differential protection device

A differential protection device and correct action technology, applied in the electrical field, can solve problems such as the influence of normal operation of smart substations, refusal to operate, and no solutions and methods, so as to prevent incorrect actions of differential protection and improve safety. Effect

Active Publication Date: 2015-10-28
NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially when the SV receiving soft pressure plate participates in the current differential protection, the mistaken withdrawal of the SV receiving soft pressure plate will cause incorrect actions of the differential protection device, such as malfunction and refusal, which will inevitably cause great damage to the normal operation of the smart substation. big impact
According to the retrieval of technicians, there is no way and method to solve this problem in the world

Method used

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  • A method to prevent incorrect operation of differential protection device
  • A method to prevent incorrect operation of differential protection device
  • A method to prevent incorrect operation of differential protection device

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Embodiment Construction

[0044] The present invention will be specifically introduced below in conjunction with the accompanying drawings and specific embodiments.

[0045] The invention relates to a method for preventing incorrect action of a differential protection device caused by an SV receiving soft pressure plate exiting incorrectly in an intelligent substation. The present invention proceeds from the following levels: firstly, the differential protection device 1 needs to check whether the withdrawal operation of the SV receiving soft pressure plate is reasonable, and the actual operation is performed by merging the current transmitted by the unit to the differential protection device 1; Secondly, in the case of no load or very light load, the above method of verifying the current will fail. At this time, it is necessary to judge the withdrawal of the SV receiving soft pressure plate through the method of verifying the current when the load increases to be recognizable. Whether the operation is...

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Abstract

The invention discloses a method for preventing incorrect operation of a differential protection device. Firstly, the differential protection device verifies whether the withdrawal operation of an SV (Sampled Value) receiving soft pressing plate is rational or not; the verification is performed through the current transmitted to the differential protection device during actual operation; secondly, under the condition of no load or extremely light load, the current verification mode becomes invalid, and at the moment, whether the withdrawal operation of the SV receiving soft pressing plate is rational or not is judged by using the current verification mode again when the load is required to be increased to be recognizable; and finally, when the SV receiving soft pressing plate is in the withdrawal state, the power system fails, and at the moment, the condition whether the state of the SV receiving soft pressing plate is rational or not is required to be verified through failure recognition. According to the method for preventing the incorrect operation of the differential protection device, the situation of incorrect operation of differential protection caused by wrong withdrawal of the SV receiving soft pressing plate can be effectively prevented, and the safety of the operation of the intelligent power grid is improved.

Description

technical field [0001] The invention relates to a method for preventing incorrect action of a differential protection device, in particular to a method for preventing incorrect action of a differential protection device in an intelligent substation caused by the wrong exit of a SV receiving soft pressure plate, and belongs to the field of electrical technology. Background technique [0002] With the advancement of science and technology, the input and output of protection devices in smart substations have changed. The current of protection devices in conventional substations is directly sampled, while the current sampling in smart substations is completed by the merging unit and transmitted to differential protection devices through optical fiber communication interfaces. . Such as figure 1 Shown is a schematic diagram of a smart substation. A compartment includes an intelligent terminal, a switchgear, a transformer, and a merging unit. The switchgear is connected to the i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/22
Inventor 汪思满唐治国康丰周小波肖明
Owner NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD
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