A novel surge protector

Abstract

The invention discloses a novel surge protector, which includes a first varistor element, a second varistor element, a gas discharge tube, a heat-generating element and a heat-conducting terminal withlow heat resistance; The first varistor element and the heating element are connected in parallel to form a parallel branch, the second varistor element and the gas discharge tube are connected in series to form a series branch, and the parallel branch is connected in series with the series branch to form a combined circuit. The performance of the first varistor element to withstand surge shock is higher than that of the second varistor element to withstand surge shock. One of the lead-out terminals of the single-port combination circuit is a low thermal resistance heat conduction terminal, which is thermally coupled with the heating element, or the low thermal resistance heat conduction terminal is thermally coupled with the second varistor element, or the low thermal resistance heat conduction terminal is thermally coupled with the gas discharge tube.

Description

technical field [0001] The invention relates to the technical field of power supplies, in particular to a novel surge protector. Background technique [0002] Surge protector (SPD for short), as a standard low-voltage electrical appliance, is widely used in low-voltage transmission and distribution lines. Quality and ensuring the safety of electrical appliances have obvious effects. [0003] The core component of the SPD is a surge suppression component, the most commonly used is a varistor ceramic chip. Due to the long transmission distance of power transmission and distribution lines and their exposure to the open air, they are more likely to suffer from high-energy surge pulses than indoor electrical equipment. During the design life of the SPD, the varistor ceramic chips are more likely to be damaged beyond the rated specifications The multiple impacts of the high-energy surge caused the deterioration and failure of the varistor. Since the varistor is a short-circuit ...

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Problems solved by technology

Therefore, the two actual conditions that can make the gas discharge arrester 3 return to the disconnected state do not exist or exist with a very small probability, so that if this scheme is put into practical application, it will cause frequent malfunctions of the thermal fuse element 5 and lose use value

[0008] Secondly, since the gas discharge arrester 3 and the varistor 4 have completely different working principles, their absorbing capacities for surges of different shapes are also very different. Satisfied that the surge impact resistance of the varistor 4 is greater than that of the gas discharge arrester 3, it may be incorrect under a surge pulse with a width of 2 milliseconds

Since the waveforms of surges in practical applications have various shapes, it is very difficult to achieve correct matching

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