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Detection device and method of current transformer secondary loop short-circuit

A current transformer and secondary circuit technology, which is applied in the field of detection devices for short circuit of the secondary circuit of current transformers, can solve problems such as low accuracy and complicated test methods, and achieve high accuracy

Inactive Publication Date: 2018-12-28
CHINA ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] For this reason, the technical problem to be solved by the present invention is to overcome the problems of complex test methods and low accuracy in the prior art, thereby providing a detection device and a short circuit detection device for the secondary circuit of a current transformer with a simple method and improved measurement accuracy. method

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  • Detection device and method of current transformer secondary loop short-circuit

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Embodiment 1

[0019] Such as figure 1 As shown, this embodiment provides a detection device for a secondary circuit short circuit of a current transformer, including a secondary circuit state identification unit 11, a high frequency signal injection unit 12, a current signal detection unit 13, a first coil 14 and a sampling resistor 15 , wherein the secondary circuit state recognition unit 11 is connected to the high-frequency signal injection unit 12, and the high-frequency signal injection unit 12 is connected to the first coil 14 through the sampling resistor 15, and the sampling resistor 15 The current signal detection unit 13 is connected to the secondary circuit state identification unit 11, the secondary circuit state identification unit 11 calculates the impedance of the secondary circuit, and judges the current transformer two by comparing the impedance with a threshold value Whether the secondary circuit is short circuited.

[0020] The detection device for the secondary circuit ...

Embodiment 2

[0025] This embodiment provides a detection method for the short circuit of the secondary circuit of the current transformer, using the detection device for the short circuit of the secondary circuit of the current transformer described in Embodiment 1 to monitor whether the secondary circuit of the current transformer is short-circuited, including the following steps: S1: Apply the high-frequency voltage signal generated by the secondary circuit state identification unit 11 to the first coil 14; Step S2: Detect the current signal, and transmit the detected value to the secondary circuit state identification unit 11, through The secondary loop state identification unit 11 calculates the impedance of the secondary loop; Step S3: compare the impedance with a threshold to determine whether the secondary loop of the current transformer is short-circuited.

[0026] The detection method for the secondary circuit short circuit of the current transformer described in this embodiment, i...

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Abstract

The invention relates to a detection device and method of current transformer secondary loop short-circuit. The device comprises a secondary loop state identification unit, a high-frequency signal injection unit, a current signal detection unit, a first coil and a sampling resistor; the secondary loop state identification unit is connected with the high-frequency signal injection unit, the high-frequency signal injection unit is connected with the first coil through the sampling resistor, the sampling resistor is connected with the secondary loop state identification unit through the current signal detection unit, and the secondary loop state identification unit computes the impedance of a secondary loop, and the impedance is compared with a threshold so as to judge whether the current transformer secondary transformer is in short-circuit. The detection device disclosed by the invention is not only simple, but also high in measurement precision.

Description

technical field [0001] The invention relates to the technical field of loop impedance detection, in particular to a detection device and method for a secondary circuit short circuit of a current transformer. Background technique [0002] Secondary circuit faults and stealing states of metering current transformers often include secondary open circuit, secondary short circuit, primary bypass, and secondary series connection of semiconductors of current transformers. Among these faults and stealing states, current transformers Secondary short circuits are the most common. The commonly used detection method is to connect two high-frequency iron cores in series in a single turn of the metering secondary circuit, wind several turns on the two high-frequency iron cores, inject a high-frequency signal through one high-frequency iron core, and then inject a high-frequency signal in the other A high-frequency iron core detects the return signal, calculates the high-frequency equival...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02
CPCG01R31/50
Inventor 王斌武殷小东姜春阳刘俊杰雷民周峰易姝慧汪根荣
Owner CHINA ELECTRIC POWER RES INST