a surge protector

Abstract

The invention relates to a surge protector, which mainly includes a breaking switch, a current sensor, a detection drive unit, a power supply, a tripping mechanism, an electromagnet, a bimetal sheet, a lightning protection element and upper and lower terminals. The upper terminal is connected in series with the breaking switch, the lightning protection element, and the lower terminal; the current sensor can detect the current situation in the line, and output the signal to the detection drive unit, and the detection drive unit drives by judging the characteristics of the detected current Electromagnet, the electromagnet can drive the tripping mechanism to move, thereby breaking the entire SPD path; the detection drive unit is connected to the power supply; the temperature of the lightning protection component is transmitted to the bimetal sheet through the heat conduction patch, and the bimetal sheet can be deformed when the temperature is too high. The tripping mechanism moves to break the circuit. This invention has a comprehensive lightning protection function, can realize quick breaking of power frequency short-circuit current, tripping when the leakage current is too large, smooth discharge of lightning current, convenient installation, safety and effectiveness.

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, and the overcurrent protection device does not operate; the thermal protection device is also limited by the speed of heat conduction. No action, resulting in the continuous passage of power frequency current, the lightning protection component heats up and the 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 area in the protection of SPD. In this area, the overcurrent protection device and thermal protection device do not operate, and the SPD fault path cannot be broken, which seriously threatens the protected equipment.

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