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A smart substation relay protection method based on double ad sampling

A technology for intelligent substation and relay protection, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as high hardware cost and malfunction, and achieve high sensitivity, improve reliability, and avoid errors.

Inactive Publication Date: 2018-02-02
XUJI GRP +2
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Problems solved by technology

[0005] The purpose of the present invention is to provide an intelligent substation relay protection method based on double AD sampling to solve the problem of high hardware cost caused by introducing two AD sampling data into two protection CPU modules to complete protection start-up and action logic operation respectively. malfunctioning problem

Method used

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  • A smart substation relay protection method based on double ad sampling
  • A smart substation relay protection method based on double ad sampling
  • A smart substation relay protection method based on double ad sampling

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Embodiment Construction

[0022] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0023] The invention is mainly applied in the high-voltage relay protection device of the intelligent substation, and the protection device simultaneously introduces the sampling data of two CT windings of the current transformers on each side into the protection device. The electronic current transformer is collected by two independent CT windings, and each CT winding adopts a dual A / D system to connect to the same merging unit, and each merging unit outputs two A / D digital sampling values ​​of a CT winding Access to protective devices through the program-level network, such as figure 1 shown. According to the relative deviation and absolute deviation of the two-way dual AD sampling data in the access protection device to judge the consistency of the dual AD sampling data, the specific process of this method is as follows:

[0024] 1. Con...

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Abstract

The invention relates to an intelligent substation relay protection method based on double AD sampling, and belongs to the technical field of electric power system relay protection. The invention introduces the dual AD sampling data output by the voltage or current combining unit into the protection device, wherein one channel of sampling data is used for protection action logic operation, and the other channel of sampling data is used for protection start logic operation, according to the relative deviation of the two channels of dual AD sampling data The consistency of the double AD sampling data is judged by the absolute deviation. If not, the protection outlet related to the analog quantity is blocked, so as to realize the relay protection of the smart substation. The invention not only avoids the error of double AD sampling, but also has high sensitivity, can improve the reliability of protection action, and ensures that the protection tripping signal is not output when the double AD sampling data is inconsistent.

Description

technical field [0001] The invention relates to an intelligent substation relay protection method based on double AD sampling, and belongs to the technical field of electric power system relay protection. Background technique [0002] The smart substation is an important support point of the smart grid, and the relay protection is one of the important secondary equipment of the smart substation. It plays a vital role in ensuring the safe and reliable operation of the power system, but the damage caused by incorrect actions of the protection Also huge. [0003] Q / GDW441-2010 "Technical Specifications for Relay Protection of Smart Substations" requires that the relay protection of 220kV and above voltage levels should adopt the principle of dual configuration. The "General Technical Conditions for Smart Substations" stipulates that the relay protection device should use two different sampling data. When the data of a certain channel is invalid, the protection device should gi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/00
Inventor 吕利娟邓茂军倪传坤马和科姚东晓肖锋赵晓铎胡沙沙席颖颖
Owner XUJI GRP
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