Non-contact multi-point grounding detection method and system for secondary circuit of current transformer

A technology of current transformer and multi-point grounding, which can be used in instruments, measuring electricity, measuring devices, etc., and can solve problems such as being unsuitable for large-scale promotion.

Active Publication Date: 2014-02-26
STATE GRID CORP OF CHINA +2
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Problems solved by technology

This method is simple and effective, and can quickly and accurately detect multi-point grounding phenomena, but it needs to be connected in series with a low-volt

Method used

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  • Non-contact multi-point grounding detection method and system for secondary circuit of current transformer
  • Non-contact multi-point grounding detection method and system for secondary circuit of current transformer
  • Non-contact multi-point grounding detection method and system for secondary circuit of current transformer

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Embodiment Construction

[0036] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0037] see Figure 2-Figure 6 , the non-contact current secondary circuit multi-point grounding detection method of the present embodiment, and construct a non-contact current circuit multi-point grounding detection system; it is Faraday's law of electromagnetic induction, in the neutral line of the current transformer secondary circuit Apply a changing magnetic field perpendicular to the neutral line to generate a changing magnetic flux in the neutral line to realize non-contact signal injection; then judge whether there is current on the neutral line, if current is generated, it is multi-point grounding; otherwise, it is one-point grounding . The specific implementation of this embodiment is as follows:

[0038] 1. Non-contact signal injection...

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Abstract

The invention relates to a non-contact multi-point grounding detection method and system for a secondary circuit of a current transformer. A changing magnetic field is exerted on a neutral line in a secondary circuit; on the basis of Faraday's law of electromagnetic induction, whether a current is generated in the neutral line is determined; and only when two-point grounding occurs at the secondary circuit is the current generated in the neutral line. And if only one-point grounding occurs at the loop, no current is generated. The system comprises: a signal injection system, which is used for exerting a changing magnetic field perpendicular to the neutral line in the neutral line; a signal acquisition device, which is used for collecting the current of the neutral line; and a data processing and grounding criterion system, which is used for determining whether multi-point grounding occurs. According to the invention, the method and the system can be applied to a transformation substation for determination of current transformer secondary circuit multi-point grounding examination; and on the premise that normal running of the protection device is ensured to be not influenced, whether multi-point grounding occurs at the secondary circuit of the current transformer can be effectively detected.

Description

technical field [0001] The invention relates to a non-contact method and system for detecting the multi-point grounding of a secondary circuit of a current transformer of a substation, belonging to the technical field of electric power automation. Background technique [0002] In the power system, the secondary circuit plays a very important role in ensuring the safe and stable operation of the system. In the normal operation mode of the system, in order to ensure the safety of people and equipment, "Eighteen Major Power Grid Anti-Accident Measures of the State Grid Corporation", " The Electric Work Site Safety Regulations stipulates that an electrical connection of the secondary circuit of the current transformer must have a reliable grounding point. At the same time, in order to ensure the correct operation of relay protection and safety automatic devices, only one grounding point is required in the current loop. However, since the current secondary circuit of the substat...

Claims

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Application Information

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IPC IPC(8): G01R31/02
Inventor 袁宇波张佳敏卜强生许建刚黄浩声李鹏
Owner STATE GRID CORP OF CHINA
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