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Sensor for direct current fault line selection and alternating current interlarding line selection

A technology of AC intrusion and DC grounding, applied in the field of sensors, which can solve the problems of uncertain positioning accuracy, indirect fault branch, positioning AC intrusion into DC, etc.

Inactive Publication Date: 2014-02-05
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The system and method determine the branch with the largest DC leakage current as the grounding branch through the metallic grounding caused by the alternating current intruding into the DC system, which solves the system positioning of the grounding line selection using the DC leakage current method to a certain extent. The problem of AC jumping into DC, but the fault branch obtained by this method is indirect, so there may be some uncertain factors in the positioning accuracy

Method used

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  • Sensor for direct current fault line selection and alternating current interlarding line selection
  • Sensor for direct current fault line selection and alternating current interlarding line selection
  • Sensor for direct current fault line selection and alternating current interlarding line selection

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Embodiment Construction

[0028] The present invention will be described in detail below in conjunction with the accompanying drawings. An object of the present invention is to provide a DC grounding line selection sensor and an AC intrusion line selection sensor, such as figure 1 Shown is the block diagram of the structure of the line selection sensor. The sensor for DC grounding line selection and AC channeling line selection is composed of a DC adjustment unit, an AC adjustment unit, a power supply unit, a micro-processing unit, a DC signal output unit, an AC signal output unit, a communication circuit, a display circuit, and an external interface circuit. Its working principle: The DC transformer and AC transformer set in the main circuit respectively sense the ground fault current and the AC intrusion current to judge whether there is a fault.

[0029] The working process of ground fault detection: the positive and negative bus bars pass through the center of the DC transformer to form the primar...

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Abstract

The invention relates to a sensor for direct current fault line selection and alternating current interlarding line selection. The sensor comprises at least one magnetic core or iron core for sensing a direct current or an alternating current, and a sensing signal of the magnetic core or iron core passes through a current signal conditioning unit and a micro-processing unit to be transmitted to an external interface circuit. The sensor can detect a fault branch circuit in time, provide basis for troubleshooting for overhaul personnel, enable a user to conveniently process failures as soon as possible and provide a powerful guarantee for safe, reliable and stable operation of a direct current power system.

Description

technical field [0001] The invention relates to a sensor, in particular to a sensor used for DC grounding line selection and AC channeling line selection, and is applied to the field of DC IT system insulation monitoring. Background technique [0002] The insulation monitoring of the DC power system in the power system can generally be divided into three parts, namely ground detection, ground line selection and ground detection. Grounding detection is to detect the insulation drop fault in time by calculating the resistance of the positive and negative busbars of the DC system to the ground, and send an alarm signal to notify the operating personnel and maintenance personnel to deal with it; Blindly switch off the power to reduce the scope of the fault; ground detection is based on the selected fault branch to find the specific location of the insulation drop, so as to eliminate the ground fault. [0003] At present, for DC insulation monitoring devices used in power plants...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R31/02G01R27/18
Inventor 王洪尹中恒周毅林雄武袁永明南寅王雪楠刘付亮赵立成王和任启郭静峰康占民李冬
Owner STATE GRID CORP OF CHINA
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