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Monitoring and arc protecting system for switch cabinet

A protection system and switchgear technology, applied in information technology support systems, emergency protection circuit devices, electrical components, etc., can solve problems such as unfavorable state monitoring and fault analysis, failure to display curves, and easy faults, etc., to improve anti-interference Capability and communication fault tolerance, reliable communication, and the effect of improving product quality

Inactive Publication Date: 2012-09-26
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the duty personnel use a handheld infrared thermometer to measure the temperature of the wires or components in the switch cabinet every day, because it is not only troublesome to open the door of the switch cabinet, but also prone to failure
[0006] The LCD liquid crystal display screen of the current arc protection device can only display Chinese characters, letters and numbers, and cannot display curves, which is not conducive to status monitoring and fault analysis

Method used

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  • Monitoring and arc protecting system for switch cabinet
  • Monitoring and arc protecting system for switch cabinet
  • Monitoring and arc protecting system for switch cabinet

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Embodiment Construction

[0018] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0019] The system proposed by the invention consists of a master and a slave, and can be used in a medium-voltage or low-voltage switchgear as a temperature monitoring, partial discharge monitoring and arc short-circuit protection device. The following takes the application of medium voltage switchgear as an example to describe the specific implementation plan.

[0020] Each master and slave unit has 4 temperature sensors and 4 UV sensors. Two temperature sensors and two ultraviolet sensors are respectively installed in the busbar room and cable room of each switch cabinet. The digital temperature sensor is connected to the peripheral communication port of the digital signal processor (DSP) through the signal line, and the DSP issues a command to make the four temperature sensors perform temperature conversion uniformly, and then the...

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Abstract

The invention relates to a running state monitoring and arc protecting system for a switch cabinet, which belongs to the monitoring and relay protection field of electric equipment. The system consists of a host machine and a slave machine which are both controlled by a DSP (Digital Signal Processor) and adopt field bus communication. A digital temperature sensor is used for monitoring the temperature in the switch cabinet; and an ultraviolet sensor is used for detecting partial discharge in the switch cabinet and ultraviolet rays emitted by short circuit arcs. The system has the characteristics that temperature rise or partial discharge caused by abnormal operation of the switch cabinet can be detected and a warning signal can be given out immediately to prevent the switch cabinet from short troubles. If the switch cabinet is suddenly short-circuited, the system can immediately detect the ultraviolet rays emitted by the arcs, rapidly transmit information through an advanced field bus and quickly and selectively clear faults.

Description

technical field [0001] The invention relates to a switchgear operating state monitoring and arc protection system, which belongs to the field of electrical equipment monitoring and relay protection in power plants and substations. Background technique [0002] Switch cabinets are important electrical equipment in power plants and substations. A short circuit can occur inside the switchgear and an arc will be generated at the point of the short circuit. In order to ensure the selectivity of the action of conventional relay protection, after a short circuit occurs inside the switchgear, in many cases, the fault removal time is often greater than 100ms. Therefore, the energy of the short-circuit arc is very large, and high temperature and pressure are formed in the closed switch cabinet, which will not only damage the components in the switch cabinet, but may also cause the switch cabinet to burn or explode, endangering personal safety and causing long-term power outages and p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/22H02J13/00
CPCY04S40/124Y04S10/20Y02E60/725Y02B90/2638Y02B90/20
Inventor 吴华仁杨建飞李晓慧
Owner NANJING NORMAL UNIVERSITY
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