基于双位置继电器构成的断路器非全相保护方法

为解决分相断路器行程走到一半、辅助触点相应处于中间状态、断路器非全相保护拒动问题，提出一种利用双位置继电器构成的断路器非全相保护方法。将断路器辅助触点引入双位置继电器对应的分合闸回路中，通过断路器辅助触点驱动双位置继电器，利用双位置继电器辅助触点构成非全相保护回路。该方法对断路器分合状态具有自保持功能，克服了断路器行程走到一半时辅助触点无法闭合的中间状态，保证断路器在非分非合状态时，断路器非全相保护可靠动作。

Method of three-phase inconsistent protection for breaker based on two-position relay

In order to solve the problem of the phase inconsistent protection of refusing action whensplit-phase breaker travelling in the middle and the auxiliary contact remaining correspondently in the middle state make phase inconsistent protection of refusing action, this paper proposes a new method for breaker inconsistent protection based on two-position relay. Auxiliary contact of breaker is switched in open and close loop for two-position relay, breaker auxiliary contacts are used to drive the two-position relay, and contacts of two-position relay are used to make a three phase inconsistent protection. This method can hold the state of breaker on and off state by itself, which overcomes the auxiliary contacts cannot close when the breaker travels in the middle state, and ensures action reliability of the phase inconsistent protection when breaker is in no-on and no-off state.