High-voltage isolation switch operation display circuit

  
As we all know, high-voltage isolation switch is not allowed to meet with a load that would otherwise produce arc, causing a short between the high voltage bus road accident, e

ndanger the equipment and personal safety. Therefore, high voltage switchgear are taking mechanical or electrical interlock device type, and only when high pressure circuit breaker, disconnecting switch to pull off; the circuit breaker in the closing position, must not be co-isolation switch. Operating sequence order can not be reversed. In order to avoid misuse of the accident, but also made high-voltage isolation switch operation display, the principle of the circuit shown in Figure 13-114. Figure, QF of high voltage circuit breaker normally open auxiliary contacts; RL is photosensitive resistance, installed in the isolation switch operating handle; H display lamp, an outer cover that read illegal operation, non-suit words, installed in the cabinet door .




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