A SCB backup protector and its control method

Abstract

The invention discloses an SCB (special circuit breaker) backup protector and a control method thereof; the SCB backup protector comprises a flat-panel discharge gap component that comprises an upper electrode, a lower electrode and a middle insulating layer positioned between the upper electrode and the lower electrode, one end of the upper electrode is connected with an output terminal, one end of the lower electrode is connected with a moving contact, the upper electrode is electrically connected with one end of a coil of a current tripping device; the SCB backup protector also comprises a triode and a comparator assembly, electrode c and electrode e of the triode are electrically connected with the coil and the moving contact respectively, an input end of the comparator assembly is connected with the moving contact, a generator comprises a first output end and a second output end, the first output end is electrically connected with electrode b of the triode, the second output end is electrically connected with the flat-panel discharge gap component, the comparator assembly compares current parameters, selects the first output end to discharge and turn on the triode if the current parameters belong to power frequency current, and selects the second output end to discharge and trigger the discharging of the flat-panel discharge gap component if the current parameters belong to lighting current; the SCB backup protector has the advantages that double-loop structure is used to make triggering, responsiveness is good, and a surge protector is greatly protected.

Description

technical field [0001] The invention relates to an SCB backup protector. Background technique [0002] In actual use, the surge protector (SPD) may be short-circuited, causing the surge protector (SPD) to fail and burn short-circuit. Therefore, people in related fields use overcurrent protection devices such as circuit breakers or fuses together with surge protectors to protect the surge protectors. However, the operating current of the circuit breaker or fuse does not match that of the surge protector (SPD), so it often occurs that the surge protector (SPD) has failed and burnt short circuit before the circuit breaker or fuse has acted. to the effect of a protective surge protector (SPD). [0003] Therefore, there is an SCB backup protector on the market, which is used to protect the surge protector (SPD). For the structure of the SCB backup protector, please refer to Chinese Patent Publication No. 102568966, which discloses a circuit breaker for surge protector backup p...

AI Technical Summary

Problems solved by technology

[0005] This kind of SCB backup protector can only play the role of protecting the surge protector in theory; in the actual process, the current is more complicated, because this structure is a purely mechanical structure (that is, the structure of the main discharge gap and the trigger gap and the principle of operation), and cannot identify whether the passing current is a lightning current or a power frequency current (short circuit current), so there will be a situation of insensitive response, so it is impossible to ensure that the surge protector can be protected

Images