Overheat, overcurrent and overvoltage lightning protector

Abstract

The invention discloses an overheat, overcurrent and overvoltage lightning protector, which comprises a flame-retardant plastic shell and lightning protection units encapsulated in the flame-retardant plastic shell; each lightning protection unit further comprises a first temperature fuse FU, a metal oxide varistor MOV connected with the first temperature fuse FU and a second temperature fuse FU' arranged beside the metal oxide varistor MOV and used for carrying out thermal monitoring. The invention further discloses a manufacturing method of the lightning protector and a lightning protection circuit. The lightning protector provided by the invention is simple in structure and the preparation method is simple and easy; when the lightning protector is applied to the lightning protection circuit, not only is the problem that a lightning-protection air switch and a lightning arrester are difficult to match solved, but also the collision between the lightning arrester and the standard specification in the actual application is avoided. Due to adoption of a lightning protection monitoring and alarming unit connected with the second temperature fuse, when the lightning protector is abnormal, an alarm can be given actively, so that intelligent lightning protection, monitoring alarm and active maintenance are achieved.

Description

technical field [0001] The invention relates to a lightning protection device, in particular to a lightning protection device for overheating, overcurrent and overvoltage. [0002] The invention also relates to a preparation method of the overheating, overcurrent and overvoltage lightning protector. [0003] The invention also relates to a lightning protection circuit with overheating, overcurrent and overvoltage lightning protection devices. Background technique [0004] The existing lightning protection method of the power supply system is to do the first, second and third levels of lightning protection, and the installation distance of each level is required to be greater than 10 meters, but it is difficult to realize the first, second, Three levels of matching. Furthermore, the installation standard requires that a lightning protection air switch be installed at the front stage of each level of lightning protection device, and the current value shall not be greater tha...

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Problems solved by technology

[0007] 2. The conflict between the actual application and the standard specification: the standard specification requires that the lightning protection air switch cannot be larger than the main circuit air switch: according to the standard, the current value of the circuit breaker at the front stage of the SPD shall not be greater than the current value of the main circuit breaker of the power supply, if it is greater than the main circuit breaker When the SPD fault short-circuits, the surge protector circuit breaker will not act, causing the circuit breaker of the main circuit of the power supply to break and the load to be powered off; if it is less than the current value of the main circuit circuit breaker (according to the current communication power supply of mobile base The circuit breaker configuration is 60A-100A), according to the Class B SPD is 100KA configuration, even if the SPD front stage uses a 100A circuit breaker, when the 100KA SPD front stage is connected in series with a 100A air switch, it will exceed 60KA / 30KV (8 / 20uS) test lightning The current will cause the air switch of the lightning protection device to trip, and the lightning protection box (device) will lose its protection function. If a continuous lightning strike occurs, the equipment will be directly damaged. function of

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