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Detecting device and its method for DC system earthing fault

A DC system, grounding fault technology, applied in the direction of measuring device, fault location, measuring electricity, etc., can solve the problems of increasing difficulty in grounding detection, complex structure of DC power grid, and inability to effectively detect grounding points, etc., to improve reliability. Effect

Inactive Publication Date: 2006-01-04
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ring network power supply makes the structure of the DC power grid complex, and the difficulty of ground detection becomes greater
On the other hand, due to the distributed capacitance of the line itself and the presence of a large number of anti-interference filter capacitors introduced in the power system automation equipment, the traditional detection device cannot effectively detect the grounding point.

Method used

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  • Detecting device and its method for DC system earthing fault
  • Detecting device and its method for DC system earthing fault
  • Detecting device and its method for DC system earthing fault

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Embodiment Construction

[0036] The present invention will be described in detail below in conjunction with the embodiments and the accompanying drawings.

[0037] Embodiments of the DC system ground fault detection device of the present invention:

[0038] Such as figure 1 As shown, the DC system ground fault detection device of the present invention includes a microprocessor and multiple current transformers, and the multiple current transformers are set on different branches of the DC system. figure 1 A plurality of current transformers are represented by CT1, CT2...CTn respectively. The microprocessor is an Advanced Reduced Instruction Microprocessor, referred to as an ARM microcontroller. The microprocessor is connected with a low-frequency signal source, a detection bridge, a display alarm and a sampling and holding circuit. The output ends of the multiple current transformers are respectively connected to the input ends of the multi-way switch, and the output ends of the multi-way switch are...

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Abstract

The present invention discloses detecting device and method for the earthing fault in DC system. The device includes microprocessor and several current transformers. The microprocessor is connected to low frequency signal source, detecting bridge, display alarm and S / H circuit. The input of the sync link is connected to the positive and negative buses of the DC system, and the output is connected via isolating link to the input of the multiway switch. The method includes monitoring the insulating status of the DC system with the double asymmetrical bridge; judging the earthing polarity, and sending signal to the microprocessor for starting the low frequency signal source and applying stable low frequency sinusoidal or cosine to the DC system in case of finding out earthing fault; and performing looped network branch treatment when the current in the current transformers is greater than 1 A, or else performing common branch treatment; and other steps.

Description

technical field [0001] The invention relates to the technical field of electric power system grounding fault detection, in particular to a DC system fault detection device and a detection method thereof in the electric power system. Background technique [0002] The DC system of power plants and substations is a very important working power source in the power system. It provides power for secondary equipment such as electrical, thermal, automatic devices, relay protection, emergency lighting, and communications. The normal work of these secondary equipment is very important to ensure the safe operation of power plants and substations. Therefore, it is required that its working power supply - DC system and its network have a high degree of reliability. When a point ground fault occurs in the DC system (directly grounded or the insulation resistance to the ground is reduced), since there is no short-circuit current flowing, the fuse will not be blown, and generally there wil...

Claims

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Application Information

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IPC IPC(8): G01R31/02G01R31/08
Inventor 李冬辉
Owner TIANJIN UNIV
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