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Secondary multipoint grounding fault judgment equipment and analysis algorithm for mutual inductor

A multi-point grounding and fault judgment technology, applied in the direction of fault location, etc., can solve the problems of complex operation, complicated criterion, measurement error of metering circuit, etc., and achieve the goal of reducing noise, high criterion margin, and improving signal-to-noise ratio Effect

Pending Publication Date: 2022-02-01
国网湖北省电力有限公司恩施供电公司
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Problems solved by technology

[0009] 1) The function is incomplete and may affect the normal operation of the secondary system. It can only determine whether a fault occurs, but cannot determine the fault point. In addition, injecting 50Hz may affect the normal operation of the secondary system and bring measurement of the metering circuit. error;
[0010] 2) The operation is complicated, and it is difficult to implement on site. This invention needs to connect each phase of each PT to the inventive device. Because there are many PTs in the substation and they are distributed in different locations in the substation, the operation is extremely complicated. In addition, the device cannot be implemented in the running state, and requires a power outage operation of the substation;
[0011] 3) Certain invention criteria are too complicated and unreliable, and are not conducive to the realization of circuits and programs

Method used

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  • Secondary multipoint grounding fault judgment equipment and analysis algorithm for mutual inductor
  • Secondary multipoint grounding fault judgment equipment and analysis algorithm for mutual inductor
  • Secondary multipoint grounding fault judgment equipment and analysis algorithm for mutual inductor

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Embodiment Construction

[0055] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0056] see figure 1 and figure 2 , a secondary multi-point ground fault judgment equipment for transformers, including

[0057]The signal generator collects the current injected into the N600 line through the first Hall current sensor;

[0058] The second output of the first Hall current sensor enters the microcontroller chip after passing through the low-pass filter;

[0059] The microcontroller chip collects a low frequency and small current signal once.

[0060] After the signal generator receives the start sampling command sent by the signal collector, it starts a timer and starts sampling;

[0061] Afte...

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Abstract

The invention provides secondary multipoint grounding fault judgment equipment for a mutual inductor. The equipment comprises a signal generator which collects the current injected into an N600 line through a first Hall current sensor; secondary output of the first Hall current sensor passes through a low-pass filter and then enters a microcontroller chip; the microcontroller chip is used for collecting a primary low-frequency small-current signal; and the injected low-frequency small signal does not cause frequency deviation due to the distributed capacitance of the secondary N600 line of the mutual inductor, and the signal is not distorted.

Description

technical field [0001] The invention relates to the field of substation secondary circuit measurement, in particular to a secondary multi-point ground fault judging device and analysis algorithm for transformers. Background technique [0002] The State Grid Corporation clearly stipulates in the "Twenty-five Key Requirements for Preventing Power Production Accidents" and GB / T14285 "Technical Regulations for Relay Protection and Safety Automatic Devices" that only one point of the PT secondary circuit is allowed to be grounded, and the grounding point should be It is set in the control room; the independent PT, which has no electrical connection with other transformers, can also achieve 1-point grounding in the switch factory. [0003] When the N600 line is grounded at the switchyard and the control room at the same time, if a short-circuit fault or lightning strike occurs in the system, a large fault current may be generated in the substation ground network. There will be a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/08
Inventor 覃宗树黄延成刘波黄卫东张华张亮章勇覃睿郭樱吕祥昕田波李晓东崔远国段昌明张悦
Owner 国网湖北省电力有限公司恩施供电公司
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