对称分量法在掘锚机组保护系统中的应用

Application of symmetrical component method in protection system of bolter-miner

针对掘锚机组异步电动机故障诊断可靠性和准确性不高的问题,提出将对称分量法应用到掘锚机组保护系统中,实现不对称性过流故障诊断。将三相电压分解为正序分量、负序分量和零序分量,通过有源移相电路和相序判别电路判别主回路的相序,通过负序分量采集电路得到负序电压值,根据负序电流值判断故障及其类型。工业性试验结果表明,对称分量法的应用提高了掘锚机组保护系统的灵敏度、可靠性、准确性和智能化水平,降低了系统维护成本,同时提高了掘锚机组异步电动机的使用寿命和掘进工作面的掘进速度。

In view of problems of low reliability and accuracy of fault diagnosis of asynchronous motor in bolter-miner,symmetrical component method was purposed to apply in protection system of bolterminer to realize asymmetry over-current fault diagnosis.Three-phase voltage is decomposed into positive sequence component,negative sequence component and zero sequence component,then active phase shifting circuit and phase sequence judgment circuit are used to judge phase sequence of main circuit,and the negative sequence voltage is obtained by negative sequence component acquisition circuit and is used to judge fault and its type.Industrial test results show that application of the symmetrical component method improves sensitivity,reliability,accuracy and intelligence level of the protection system of bolter-miner,reduces system maintenance cost,and improves service life of asynchronous motor and excavation speed on working face.