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Detection device and method for one-point grounding of voltage transformation secondary circuit N600

A secondary loop, grounding detection technology, applied in the direction of measuring devices, measuring electricity, measuring electrical variables, etc., can solve the problems of multi-point grounding of N600 network

Inactive Publication Date: 2012-05-02
STATE GRID JIANGSU ELECTRIC POWER CO LTD NANTONG POWER SUPPLY BRANCH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are multiple protective gaps installed on the N600 network. Once the gap breaks down or the insulation of the N600 network cable is damaged and grounded, it will cause multiple points of the N600 network to be grounded, causing serious consequences.

Method used

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  • Detection device and method for one-point grounding of voltage transformation secondary circuit N600
  • Detection device and method for one-point grounding of voltage transformation secondary circuit N600
  • Detection device and method for one-point grounding of voltage transformation secondary circuit N600

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Embodiment Construction

[0016] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0017] Such as figure 1 As shown, a voltage-changing secondary circuit N600 one-point grounding detection device of the present invention includes a signal generator 2 and a detector 3, the signal generator 2 and the detector 3 are placed in the detection device housing 4, and the signal generation Detector 2 is a constant current source, signal generator 3 includes two output 10mA and 100mA constant current sources, detector 3 is a high-precision detector, with high-precision clamp ammeter and recorder functions, resolution 0.1mA, accuracy is ±1%.

[0018] Such as figure 2 As shown in the present invention, a detection method for one point grounding of the voltage-changing secondary circuit N600, the signal generator 2 injects a standard current of 10mA into point A of the voltage-changing secondary voltage circuit N600 network 1,...

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Abstract

The invention relates to a detection device for one-point grounding of a voltage transformation secondary circuit N600. The detection device comprises a signal generator and a detector which are respectively arranged in a detection device casing. The invention also relates to a detection method for the one-point grounding of the voltage transformation secondary circuit N600. According to the detection method, a standard current signal is injected in a voltage transformation secondary circuit N600 network during operation; when one-point grounding of the voltage transformation secondary circuit N600 network only occurs, the magnitude of the standard current signal is consistent with the known grounding point current detected by a detector; when multi-point grounding of the voltage transformation secondary circuit N600 network occurs, the standard current is shunted; and at the same time, the magnitude of the standard current signal is inconsistent with the known grounding point current detected by the detector, and thereby two or more grounding points are judged. The detection device and method disclosed by the invention have the advantages that the one-point grounding condition of the voltage transformation secondary circuit N600 network during operation can be quickly, conveniently and safely checked and the grounding position of the voltage transformation secondary circuit N600 network is searched.

Description

technical field [0001] The invention relates to a detection device for one-point grounding of a voltage-changing secondary circuit N600. [0002] The invention also relates to a detection method for one-point grounding of the voltage change secondary circuit N600. Background technique [0003] The relay protection AC voltage circuit in the substation is one of the information sources of the protection device and the prerequisite for the correct action of the protection. According to relevant regulations, the N600 network of the transformer secondary voltage circuit must be grounded at one point and only at one point. If the N600 network is not grounded or grounded at multiple points, it may cause the protection device to malfunction or refuse to operate. [0004] ??For substations in operation, there is no way to detect whether the N600 network is truly grounded at one point, and it can only be guaranteed by the wiring when it is put into production. There are multiple pr...

Claims

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Application Information

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IPC IPC(8): G01R31/02
Inventor 赵继东朱迎阳
Owner STATE GRID JIANGSU ELECTRIC POWER CO LTD NANTONG POWER SUPPLY BRANCH
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