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Current transformer secondary side open circuit anticipation device

A technology of current transformer and secondary side, which is applied in the field of pre-judgment device for secondary side open circuit of current transformer, which can solve the problems of reducing the degree of accident occurrence, unavoidable accident, and reducing the scope of accident occurrence, so as to avoid accidents and improve Reliability, the effect of ensuring stable operation

Active Publication Date: 2015-09-09
STATE GRID CORP OF CHINA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the method to deal with the open circuit of the secondary side of the current transformer is to install an overvoltage protection device, but this method can only reduce the scope and degree of accident occurrence, and cannot avoid the occurrence of accidents

Method used

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  • Current transformer secondary side open circuit anticipation device
  • Current transformer secondary side open circuit anticipation device
  • Current transformer secondary side open circuit anticipation device

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Embodiment Construction

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0041] see figure 1 , the embodiment of the present invention discloses a structural schematic diagram of a pre-judgment device for the secondary side open circuit of a current transformer. The pre-judgment device is applied to the current circuit of the secondary side of the current transformer, and the secondary side circuit of the current transformer includes: Terminal box 01 and secondary equipment 02 to be overhauled, the input terminal of circuit breaker term...

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Abstract

The invention provides a current transformer secondary side open circuit anticipation device comprising a shunting resistor module, a resistance regulating module, a button switch and a current measuring module. The detection line of the anticipation device is connected with the input end of secondary equipment to be maintained so that a loop is formed through combination of a current transformer secondary side, and access resistance of the shunting resistor module is zero at the time and thus the secondary equipment to be maintained is enabled to be short-circuit. After the secondary equipment to be maintained is maintained and accesses to the system, access resistance of the shunting resistor module is regulated via the resistance regulation module so that current flowing out of the current transformer secondary side enters the anticipation device, and current capable of being detected by the anticipation device is enabled to be high enough. The current measuring module is arranged on the detection line in a sleeving way and the value of current flowing through each phase of the current transformer secondary side can be acquired so that anticipation of open circuit of the current transformer secondary side can be realized by judging consistency of change of the current values of each phase and existence of the current value of the zero phase after the button switch is closed.

Description

technical field [0001] The invention relates to the technical field of maintenance equipment, and more specifically, to a device for predicting the secondary side open circuit of a current transformer. Background technique [0002] The current transformer (CT) is an important part of the current measurement and relay protection system of the power system. The stability of its operation affects the accuracy of the measurement and the reliability of the protection device. [0003] The current flowing in the primary winding of a current transformer is called the primary current, and the current flowing in the secondary winding is called the secondary current. If the secondary circuit of the current transformer is disconnected, that is, the secondary side is open, the primary current will all become the excitation current, resulting in excessive saturation and magnetization of the iron core, and high voltage will be generated at the secondary winding terminals. Since the peak v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02
Inventor 林高翔王子辉龚列谦陈建胜刘主光李勇诸葛立忠张磊叶正策叶立兆郑杨钱碧甫徐惜琼徐亚乐杨剑友潘中达刘希嘉朱金垦林帆陈刚胡亦涵林琳李矗
Owner STATE GRID CORP OF CHINA
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