Novel surge protection device

Abstract

The invention relates to a novel surge protection device which mainly comprises a breaking switch, a current sensor, a detecting and driving unit, a power source, a tripping mechanism, an electromagnet, a bimetallic strip, a lightning protection element, an upper terminal and a lower terminal. The upper terminal is connected with the breaking switch, the lightning protection element and the lower terminal in series. The current sensor can detect current conditions in a circuit and output signals to the detecting and driving unit, the detecting and driving unit drives the electromagnet by judging the characteristic of detected currents, the electromagnet can drive the tripping mechanism to move, and therefore a whole SPD access is switched off. The detecting and driving unit is connected with the power source. The temperature of the lightning protection element is transmitted to the bimetallic strip through a heat conduction paster, and when the temperature is too high, the bimetallic strip can be deformed to drive the tripping mechanism to move, and the circuit is switched off. The novel surge protection device has the comprehensive lightning preventing function, power frequency short-circuit currents can be switched off fast, tripping can be carried out when leakage currents are too high, lightning currents are discharged smoothly, and the novel surge protection device is convenient to mount, safe and effective.

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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