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Bridge type direct-current fault monitoring alarm

A DC fault and alarm technology, applied in the fault location, instrument, measuring electricity and other directions, can solve the problems of cumbersome and normal line power failure, and achieve the effect of reducing difficulty, improving sensitivity and accuracy, and accurately processing

Active Publication Date: 2014-03-26
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, when there was no automatic fault monitoring device, if a fault occurred, it was necessary to manually pull the switch and use the method of power outage one by one to find the faulty line, which was cumbersome and caused normal lines to be affected by power outages.

Method used

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  • Bridge type direct-current fault monitoring alarm

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Embodiment Construction

[0022] Principle of signal acquisition: unlike alternating current, direct current has a weak electromagnetic field and difficult sampling. For this reason, this device uses advanced Hall technology to solve such problems. The Hall sensor model used is CS1000EK2.

[0023] Hall sensor structure and sampling method such as figure 1 Shown: The Hall sensor is a semiconductor device, which is in a fixed state when no current passes through it; when the DC system is grounded, an unbalanced current is generated, and the charge will be activated in the Hall sensor to send out a correspondingly changing electrical signal. We then transmit these signals to the host computer for comparison and judgment to confirm the fault, and then give an audible and visual alarm.

[0024] exist figure 1 Among them, the measured U+ and U- DC lines 1 pass through the core hole 3 of the Hall sensor device 2 at the same time, and the other end of the line is connected to the useful electrical device L (...

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Abstract

The invention discloses a bridge type direct-current fault monitoring alarm, and belongs to fault monitoring devices of direct-current power sources for power plants and substations. According to the bridge type direct-current fault monitoring alarm, a balance bridge arm is formed by two identical resistors and a loaded line, a Hall sensor is used for obtaining signals from a monitored direct-current line in a sampling mode, the signals pass through two comparison control units in a parallel mode, and then are output to two sound-light alarm units respectively, each comparison control unit mainly comprises an integrated operational amplifier module and a potentiometer, each sound-light alarm unit comprises triodes and an alarm bell, and the triodes are used for carrying out power amplification. The bridge type direct-current fault monitoring alarm can be locally installed to be used, positive and negative grounding faults are indicated through sound-light alarms, and the bridge type direct-current fault monitoring alarm has the advantages that the manufacturing cost is low, the bridge type direct-current fault monitoring alarm can be locally installed to be used and can locally give out the alarms, and the faults can be found out in time.

Description

technical field [0001] The invention relates to a fault monitoring and alarming device for a DC power supply, in particular to a positive and negative grounding fault monitoring and alarming device for a DC power supply used in a power plant or a substation. Background technique [0002] Different levels of DC power supplies such as 48V, 110V, and 220V are widely used in power plants and substations for communication, relay protection, central signaling, and switch tripping and closing. The DC power supply is branched through the small bus bar, with many directions and complex lines, so faults such as damp, grounding, impact, and short circuit occur from time to time. In the past, when there was no automatic fault monitoring device, if a fault occurred, it was necessary to manually pull the switch and use the method of power outage one by one to find the faulty line, which was cumbersome and caused normal lines to be affected by power outages. Contents of the invention ...

Claims

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Application Information

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IPC IPC(8): G01R31/08G01R31/02
Inventor 林崇华黄楚翔舒云伟
Owner STATE GRID CORP OF CHINA
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