具备故障定位功能防反充电PT并列装置的研制

Development of a PT parallel device with fault location function used to prevent reverse charge

为杜绝电压互感器(PT)并列反充电导致并列装置损坏、空开跳闸等故障发生,研制出一种基于ARM的具备故障定位功能防反充电PT并列装置。详细介绍了该装置工作原理及总体构成、软硬件设计。该装置通过采集、计算同相电压差值作为并列必要条件,具有传统PT并列装置没有的防异常并列、防反充电功能。且并列电路中设计有由新型电子元件自恢复保险丝(PPTC)构成的过流阻断电路,可瞬时隔离故障并能自动恢复。通过电压比较、判别,能自动定位、识别高压保险熔断、二次空开跳闸、母线接地等故障,并实时显示各相电压值及故障信息,大大缩短检修人员故障查找处理时间,提高了供电可靠性。

To prevent parallel device damage and breaker tripping fault occur caused by PT parallel reverse charge, a PT parallel device based on ARM is developed, which has fault location function and can prevent reverse charge. This paper introduces the device＇s working principle and the overall structure, hardware and software design in detail. The device takes data acquisition and calculating of in-phase voltage difference as parallel necessary condition, and has the advantage of preventing abnormal parallel and reverse charging function compared to traditional PT parallel device. In parallel circuit, it designs an overcurrent blocking circuit based on new electric component PPTC, with transient fault isolation and automatic recovery function. By the voltage comparison and discrimination, it can identify the high voltage fuse breaking, breaking tripping, and bus ground fault automatically, which has the function of fault location. It also can real-time display each phase voltage and fault information, which greatly shortens the maintenance personnel troubleshooting time and enhances the safety and stability operation of the power supply.