基于信号触发的电气线路漏电故障检测系统

Electric Line Fault Leakage Detection System Based on Signal Trigger

摘要:

低压电气线路漏电故障发掘电路是当电气网络中发生漏电故障时,通过对漏电触发信号进行检测,从而对故障位置进行定位,并切断电气线路电源的装置,确保了供电网络的安全性以及可靠性；在对目前低压电气线路漏电保护系统研究的基础上,提出了以STC15F2K60S2单片机为控制核心, 选定的测试模拟触发信号漏电流,不小于电气线路和设备的正常泄漏电流的最大值的2倍；漏电故障测试信号的灵敏度,优先考虑30 mA,当额定漏电动作电流等于或小于30 mA时要求保护动作时间小于0.1 s,当额定漏电动作电流大于30 mA时要求小于0.2 s；该装置是传统漏电保护装置的补充, 根据间接漏电检测与直接漏电检测结果与实际的漏电位置距离对比,误差在10%以内,满足实际需要,改善了低压电气线路漏电保护系统的保护性能。

Abstract:

Low voltage electrical circuit leakage fault excavation is when happen leakage faults in the electrical network, the trigger signal through to carry on the inspection, thereby fixing the fault location, and to cut off the power supply device, electric circuitry to ensure the safety and reliability of power supply network. In the research on the low voltage electrical leakage protection system on the basis of the proposed STC15F2K60S2 single chip microcomputer as control core, the selected test analog trigger signal leakage current, no less than the normal leakage current of electrical wiring and equipment a maximum of 2 times. Leakage fault test signal, the sensitivity of the preferred 30 ma, when the leakage current action rating equal to or less than 30 ma demanding action time is less than 0.1 s, when the leakage current action is more than 30 ma rating requirements is less than 0.2 s. The device is a supplement to the traditional electric leakage protection devices, according to the indirect leakage detection and leakage test results directly compared with the actual leakage location distance, the error is within 10%, meet the actual needs, to improve the protection performance of low voltage electrical leakage protection system.