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变电站中低压开关柜过热故障在线监测系统
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摘要
开关柜是保证电力系统安全运行的重要设备之一,但是经常因为开关柜局部过热,而引起事故,造成损失。在以往的开关柜过热故障检测中,采用人工巡检,不仅费时、费力,而且不易及时发现事故。开关柜过热故障在线监测系统不仅克服了开关柜内高温、高压、强磁场环境下温度不易监测的难题,而且通过监控软件实时显示开关柜内测点的当前温度值,并做出报警处理,节省了大量人力、物力,提高了事故预判的准确性、实时性。
     本文从硬件和软件两个方面介绍了监测系统的设计过程。硬件方面设计了两种不同的温度传感系统:中压开关柜过热故障监测采用光纤式温度传感器,同时采用光纤传输数据;低压开关柜采用单总线数字式温度传感器,数据采用无线传输。监测系统软件主要实现了实时显示测点温度,并对温度数据做出分析、报警、保存等功能。及时提醒工作人员对报警情况做出处理,避免事故的发生。
     通过现场实验,开关柜过热故障在线监测系统运行良好,达到了预期的设计目标,为开关柜的安全应用提供了保证。
As the most important equipment, Metal-clad switchgear guarantee the safe operation of electric power system. Sometimes, the temperature of part of Metal-clad switchgear maybe over the limit of safe operation, and then arouse accident, bring losing. In past, workers check up the Metal-clad switchgear on schedule, which takes time and hard sledding, can not work efficiency and betimes. On-line real-time monitoring for temperature overcome the difficulties of high temperature, high voltage and high magnetic field, to be a new method of checking up the Metal-clad switchgear. It can show the temperature of the spot of being monitored, judge the temperature and give an alarm. The system saves lots of resource and improves the veracity.
     The paper presents the detail about the procedure of the design for the system from both hardware and software aspects. There are two defferent design of hardware: optical fiber temperature sensor is used for middle-voltage Metal-clad switchgear, which data is transferred by optical fiber; another one is 1-Wire Digital Thermometer, it is used for lower-voltage Metal-clad switchgear, and the data is transferred by unwired. The software of On-line real-time monitoring for temperature can show the temperature real-time, analyse the data, gave an alarm, save the data, and so on. The system can awoke the workers about the alarm in time, avoiding the accident.
     The result of the axperiment indicates the new system works well, it has accomplished the design aims of anticipating, providing a good guarantee of the safe operation of Metal-clad switchgear
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