Novel surge protection device

Abstract

The invention relates to a novel surge protection device which mainly comprises breaking contacts (a fixed contact and a moving contact), a tripping mechanism, a stepping electromagnet, a switch-on wrench, a locking plate, a current sensor, a power frequency current suppressor, a delay stepping electromagnet, an arc chute, an arc extinction magnetic blow-out plate, an upper terminal, a lower terminal and a lightning protection element. The upper terminal is connected with the breaking contacts, the power frequency current suppressor, the lightning protection element and the lower terminal in series. The delay stepping electromagnet moves fast when power frequency currents pass through current signals output by the current sensor, the locking plate is pushed, the tripping mechanism is driven to turn off a whole surge protection device access. The delay stepping electromagnet does not move when lightning currents pass, and the lightning currents can be discharged smoothly. The novel surge protection device effectively solves the protection dead zone problem of an existing surge protection device backup protection device, lowers residual voltages, and is safe and reliable.

Description

technical field [0001] The invention belongs to the technical field of surge protection for electronic and electric equipment. Background technique [0002] Lightning is a special weather phenomenon caused by the discharge of charged clouds in the air. Lightning is an important cause of damage to electronic equipment, which threatens the safe and stable operation of electronic information systems in various fields such as construction, railways, civil aviation, communications, industrial control, and military. Installing a surge protective device (SPD) on metal lines such as power lines, signal lines, and control lines connected to electronic equipment is one of the important measures for lightning protection. Surge protectors have been widely used in various fields and play an important role in lightning protection. The quality of its state directly affects its lightning protection effect, thus bringing hidden dangers to the safety of the protected equipment. [0003] Th...

AI Technical Summary

Problems solved by technology

However, when the power system fails, SPD overcurrent short circuit, power frequency current passes, its current value may not reach the starting value of the overcurrent protection device, the overcurrent protection device does not operate, resulting in continuous power frequency current passing, the lightning protection component Fever SPD catches fire

If the start-up value of the over-current protection device is selected to be small, although it can be started, it is difficult to resist the impact of lightning current, and the SPD cannot discharge the lightning current normally.

Therefore, the existing overcurrent protection device has a serious blind zone in the protection of SPD. In this area, the overcurrent protection device does not operate and cannot break the SPD fault path.

In addition, the existing overcurrent protection device is installed separately from the SPD, which requires a large installation space, and the wiring is complicated, which increases the residual voltage and threatens the protected equipment

Images