Surge protector with short circuit current protection

Abstract

A surge protector (100) with short-circuit protection function includes a surge protection module (102) and a short-circuit current protection module (101). The surge protection module discharges and suppresses surge current and voltage. The surge protection module is a plug-in module. The short-circuit current protection module is integrated in the base. The short-circuit current protection module provides short-circuit protection and plug-in installation for the surge protection module. This surge protector overcomes the problem of inrush current caused by using an external overcurrent protection device for backup protection. At the same time, it has strong current limiting capability, good short-circuit breaking capability, small minimum instantaneous tripping current value, and can be used under temporary overvoltage (TOV). It can tolerate failure modes and can also play a protective role under low current.

Description

technical field [0001] The invention relates to the field of overvoltage protection of low-voltage power distribution systems, and more specifically relates to a voltage-limiting surge protector with short-circuit protection function. Background technique [0002] Due to factors such as impact, power frequency voltage fluctuations, and environmental temperature changes, the components (varistors) of the voltage-limiting SPD will inevitably deteriorate or fail due to short-circuit, resulting in thermal, short-circuit, or electric shock failures. The object or system itself poses a threat. Therefore, the voltage-limiting SPD must be protected against deterioration and short-circuit, that is, it must be equipped with a disconnector to prevent thermal collapse (thermal protection) and short-circuit failure (short-circuit protection). When the pressure-limiting SPD is degraded or short-circuited, the disconnector can disconnect the SPD from the system to prevent the system from ...

AI Technical Summary

Problems solved by technology

[0005] However, the patent application still has great defects, such as: 1. Small current capacity; 2. Low short-circuit breaking capacity; 3. There is no short-circuit current short-circuit multiple overload protection, and the protection interval is small; 4. Short-circuit protection device protection reliability Not high; 5. The problem of temporary overvoltage protection caused by system failures caused by large-capacity surge shocks is not considered; 6. The overall volume of the product is large

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