PT secondary circuit online N-line multipoint ground fault detection method and device

A secondary circuit, multi-point grounding technology, applied in the direction of measuring device, fault location, measuring electricity, etc., can solve problems such as poor effect and low reliability, and achieve the effect of high efficiency, high reliability, and convenient and fast search method.

Active Publication Date: 2014-08-13
ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD +2
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Problems solved by technology

[0016] The technical problem to be solved by the present invention is to provide an online N-line multi-point ground fault detection method for t

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  • PT secondary circuit online N-line multipoint ground fault detection method and device
  • PT secondary circuit online N-line multipoint ground fault detection method and device
  • PT secondary circuit online N-line multipoint ground fault detection method and device

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Embodiment Construction

[0044] The online N-line multi-point grounding fault detection method of the PT secondary circuit of the present invention comprises:

[0045] Step 1, install the jaws of the first clamp current transformer CT1 and the second clamp current transformer CT2 on the public circuit N600 of the PT secondary circuit, wherein the secondary of the first clamp current transformer CT1 The winding is connected in series with an adjustable resistor Rw;

[0046] Step 2, adjusting the resistance value of the adjustable resistor Rw to change according to the preset time-resistance curve, and synchronously recording the first time-current curve of the secondary winding induced current of the second clamp-on current transformer CT2;

[0047] Step 3: Compare the first time-current curve with the preset time-resistance curve, if they tend to change in the same way, it is determined that there is a N-line multi-point ground fault in the PT secondary circuit; otherwise, it is determined that the PT...

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Abstract

The invention discloses a PT secondary circuit online N-line multipoint ground fault detection method and device. The method comprises the following steps: both of the jaw of a first split core type current transformer (CT1) and the jaw of a second split core type current transformer (CT2) are installed on a common circuit N600(an) of the PT secondary circuit, wherein the secondary winding of the first split core type current transformer is serially connected with an adjustable resistor (Rw); the resistance of the adjustable resistor (Rw) is adjusted so as to be changed according to a preset time-resistance curve, and a first time-current curve of the secondary winding induced current of the second split core type current transformer is recorded synchronously; the first time-current curve is compared with the preset time-resistance curve, if the change modes of the two curves tend to be the same, then an N-line multipoint ground fault is judged to exist in the PT secondary circuit, or else, no N-line multipoint ground fault is judged to exist in the PT secondary circuit. According to the invention, advantages of safety, reliability and high efficiency can be realized.

Description

technical field [0001] The invention relates to an online N-wire multi-point ground fault detection method of a PT secondary circuit and an online N-wire multi-point ground fault detection device for realizing the detection method. Background technique [0002] The multi-point grounding of the N line of the secondary circuit means that the neutral line of the secondary circuit of the voltage current transformer winding with three-phase four-wire connection has two or more grounding points connected to the grounding network of the factory station or N600, and it is grounded from the transformer There is more than one grounding point between the terminal box and the neutral line of the voltage secondary circuit of the electric energy meter. [0003] In the power system, the secondary circuit plays a very important role in ensuring the safe operation of the system. Under the normal operation of the system, in order to ensure the safety of people and equipment, the "Safety Regu...

Claims

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Application Information

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IPC IPC(8): G01R31/08G01R31/02
Inventor 黄东山周卫陈铭张冬容李秋霞杨理才谢春杨
Owner ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD
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