Detection device for multi-point earthing fault of small bus N600

A multi-point grounding and fault detection technology, applied in the direction of measuring devices, measuring electricity, measuring electrical variables, etc., to eliminate grounding faults, prevent interference signals, and make accurate judgments

Active Publication Date: 2015-02-18
HUAIAN OF JIANGSU ELECTRIC POWER COMPANY POWER SUPPLY +2
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  • Abstract
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  • Claims
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Problems solved by technology

[0005] The purpose of the present invention is to provide an N600 multi-point ground fault detection device, which can make an accurate judgment on the single-point grou...

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  • Detection device for multi-point earthing fault of small bus N600
  • Detection device for multi-point earthing fault of small bus N600
  • Detection device for multi-point earthing fault of small bus N600

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Embodiment Construction

[0014] Such as figure 1 As shown, the N600 multi-point ground fault detection device is composed of a constant current signal generator A, a signal sampler B, and a signal analyzer C connected in an electrical circuit; the constant current signal generator A generates 5mA, 20mA, 100mA, 200mA The signal is injected into the N600 small bus; the signal collector B receives the 5mA, 20mA, 100mA, 200mA square wave signals generated by the constant current signal generator A, and the signal collector B samples the different signals generated by the constant current signal generator A. The square wave current signal of the current is sent to the signal analyzer C for judgment, to analyze whether a multi-point grounding fault occurs; the constant current power signal generated by the constant current signal generator A is fed to the N600 small bus, and the signal sampler B samples the constant current signal Generator A is injected into the N600 small bus, and signal analyzer C analyz...

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Abstract

The invention discloses a detection device for multi-point earthing fault of a small bus N600. The detection device is composed of a constant-current signal generator (A), a signal sampler (B) and a signal analyzer (C) which are connected in the electric loop manner. The constant-current signal generator (A) generates square signals of 5mA, 20mA, 100mA and 200mA and injects the same into the small bus N600; the signal sampler (B) receives and samples the square signals of 5mA, 20mA, 100mA and 200mA which are generated from the constant-current generator (A) and send the same to the signal analyzer (C) to judge whether or not the multi-point earthing fault occurs. The detection device has the advantages that synchronizing signal current measurement is adopted, earthing correctness of the earthing loop N600 is determined through judgment of two currents, thus earthing correctness and validity of the loop N600 of the transformer substation is effectively detected during operation, various interference signals are prevented, judgment is accurate, false alarm is avoided, and earthing fault is eliminated.

Description

technical field [0001] The invention relates to the field of power system detection equipment, in particular to a N600 multi-point ground fault detection device for a PT secondary public circuit used for substation relay protection. Background technique [0002] The wiring of the relay protection device is complicated. The secondary circuit of the PT is from the outdoor PT site to the control room, and the terminal box to the protection screen. There are many lines and long wires. The zero line in the control room is called the N600 small bus. The electric power industry and the State Grid "Power System Relay Protection Anti-accident Measures" clearly stipulate that the secondary circuits of several groups of voltage transformers connected through the control room zero-phase small bus N600, Only one point in the control room should be grounded. If there is a multi-point ground fault, in severe cases, the relay protection device and the safety automatic device will not operat...

Claims

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Application Information

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IPC IPC(8): G01R31/02
Inventor 陈健王德全吴绍武谢剑锋陈书欣朱瑾张明陈凯王东阳
Owner HUAIAN OF JIANGSU ELECTRIC POWER COMPANY POWER SUPPLY
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