三相电能表逆相序检测报警电路

本文提出了一种新型三相电能表逆相序检测报警电路,简单介绍了其工作原理及组成结构,并辅以矢量图着重从理论上对该电路加以证明,当电能表相序接错时报警,以便及时更正接线错误,保证电能表的正确计量.该报警电路结构简单,所用元器件少：由电容、电阻、发光二极管组成,已被试用于某厂三相电度表中,运行结果表明该电路简洁易行,可靠性高,具有较高的实用价值,可广泛应用于逆相序检测系统中.

Reverse phase sequence detecting circuit for three-phase power meter

This paper introduced structure and operating principle of a new kind of alarm circuit which can detect reverse phase sequence connection in three-phase power meter. It mainly expounded the circuit with vector diagrams in theory. When power meter is in reverse-phase-sequence condition, this circuit will alarm to tell operator to correct error connection in time. This guarantees the exact metering of power meter. The circuit, composed of few components such as capacitor, resistance and LED, is very simple. After long period application, the results show that it has distinct practical value and high reliability and can be widely used in reversephase-sequence detection.