Short-circuit protection device for power frequency current and lightning surge automatic selection channel

Abstract

The invention discloses a short-circuit protection device for a power frequency current and lightning surge automatic selection channel and relates to the technical field of lightning protection. The short-circuit protection device comprises a power supply and a power supply lightning arrester. An inlet wire terminal, a splitting or integrating device, a power frequency channel device, a lightning surge channel device and an outlet wire terminal are arranged in a machine casing. The power supply, the inlet wire terminal, the splitting or integrating device, the power frequency channel device, the outlet wire terminal and the power supply lightning arrester are connected in sequence, and the lightning surge channel device is in parallel connection with the power frequency channel device. Front-end protection of the power supply lightning arrester is achieved, the problem that dripping occurs when a power supply line is subjected to lightning hazards is solved, the lightning arrester structure is simplified, the technical requirements for a varistor are reduced, and the short-circuit protection device is suitable for front-end protection of various power supply lightning arresters and short-circuit protection of a main power supply in a frequent lightning area.

Description

technical field [0001] The invention relates to the technical field of lightning protection, in particular to a short-circuit protection device for automatically selecting channels for power frequency current and lightning surge. Background technique [0002] Surge Protective Device (SPD) is a power supply safety protection product. It is required that this product: when the performance of the non-linear element of the SPD deteriorates and fails, it must be automatically disconnected from the power supply, and a warning indication of deterioration will be issued to facilitate maintenance personnel. Replace it in time. However, due to the long-term large leakage heat accumulation of the nonlinear element will cause the danger of fire; in addition, the nonlinear element is automatically separated from the power supply and the deterioration warning indication is completed by the release mechanism, due to the quality and production technology of the nonlinear element The trippi...

AI Technical Summary

Problems solved by technology

[0003] At present, the short-circuit protection device installed in front of the lightning arrester is a circuit breaker (or fuse), with specifications ranging from tens of amps to hundreds of amps. According to the characteristics of the circuit breaker (or fuse), the circuit breaker or fuse trips The off (or fusing) current will be larger. In the case of a breakdown of the lightning arrester, due to the certain resistance of the non-linear components after being broken down, the short-circuit current of the circuit cannot reach the circuit breaker (or fuse) to trip (or fusing) current value, the circuit breaker does not operate or takes a long time to trip, which is easy to cause fire, which does not meet the requirements of the short-circuit protection device installed in front of the power surge protector; it should be operated under a small power frequency current disconnected, and in the case of lightning surge, the short-circuit protection device is closed, so that the lightning surge can pass through

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