Backup protection unit for surge protector

Abstract

Disclosed is a backup protection unit of a surge protector, which is connected to the surge protector. The backup protection unit includes: a faulty driver, a tripping mechanism, a contact switch, an operating handle and an indicator, and a faulty driver is connected in parallel with a surge bypass. Alternatively, the backup protection unit includes a fault protector and an indicator, the fault protector is connected in series with a surge blocker, and surge bypassers are connected in parallel at both ends of the series circuit formed by the series fault protector and surge blocker. The surge bypass device provided by the present invention realizes the effective separation of surge and fault current, diverts the surge energy that the fault driver should bear, and thus improves the surge impact capability.

Description

technical field [0001] The invention relates to the field of overcurrent and overvoltage protection, and more specifically relates to a backup protection unit used for backup protection of surge protectors. Background technique [0002] During the operation of the surge protector, due to excessive surge energy or system voltage fluctuations, it will cause functional damage or system failure, such as the decline of protection performance, short circuit of the system, etc., and the existing products do not have short circuit Fault current breaking capacity may eventually cause accidents such as interruption of power supply or fire. For this reason, application standards such as IEC and GB stipulate overcurrent protection measures when the surge protector fails in a short circuit, such as installing overcurrent protection devices such as fuses or circuit breakers. However, the existing fuse or circuit breaker product technology is based on power frequency characteristics, and ...

AI Technical Summary

Problems solved by technology

However, the existing fuse or circuit breaker product technology is based on power frequency characteristics, and there is no technical performance index related to surge, which often causes problems in the performance of the two, such as whether the overcurrent protection device can withstand The surge shock that matches the surge protector; whether the overall residual voltage of the two exceeds the withstand voltage of the protected equipment; whether the overcurrent protection device can cooperate with the previous stage

[0003] Although the selection of a circuit breaker with a high rated current can meet a certain range of requirements, it will increase the user's cost of use, and more importantly, it is difficult to achieve selective cooperation with the previous stage overcurrent protection device (for the surge of the small load system in the strong lightning area) protection is particularly prominent)

These problems seriously restrict the engineering application of the backup overcurrent protection device of the surge protector

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