Lightning arrester with thermal excitation dropper

Abstract

The invention relates to a lightning conductor which carries the thermal excitation type abscission implement, belongs to the arrester and its abscission implement domain. It is composed of the arrester, the thermal exciter and abscission implement. The inferior extremity of the arrester connects with the superior extremity of the thermal exciter; the inferior extremity of thermal exciter connects with the superior extremity of the abscission implement. The arrester connects with the out-circled electric heating wire of normally open contact and the bimetallic strip in the thermal exciter; the normally open contact connects with the abscission implement, the inferior extremity of the abscission implement and the inferior extremity of the electric heating wire both connect with the earth line. The thermal exciter is composed of outer covering, superior connecting fitting, inferior connecting fitting, earth line connection bullion, strip conductor, the normally open contact, bimetallic strip and out-circled electric heating wire. The normally open contact, bimetallic strip and out-circled electric heating wire all install in the thermal excitation crustaceous atrium. When the electrical network has happened the thunder stroke voltage, the thunder current through the electric heating wire joins to the ground, no longer induces the abscission implement detonation. Once the arrester had short circuit damaged, the short-circuit current caused the heating wire to detonate the abscission implement, prevented the electrical network high pressure earth accident.

Description

(1) Technical field [0001] The invention relates to a lightning arrester and its shedding device, and also to a piezoresistor and a thermal relay, in particular to a lightning arrester with a heat-activated shedding device. (2) Background technology [0002] The commonly used surge arresters for 6-10KV transmission lines are designed based on the principle of varistors. Its upper end is connected to the three-phase high-voltage electricity of the angle connection method, and its lower end is connected to the ground wire. In non-lightning weather, the varistor resistance of the arrester is extremely large, and it is in an open circuit state; in thunderstorm weather, if an instantaneous lightning strike voltage occurs on the power grid, the varistor resistance of the arrester is zero, and the instantaneous lightning current enters the ground at an extremely fast speed , so as to protect the grid equipment from lightning strikes. However, if the arrester is broken, not only w...

AI Technical Summary

Problems solved by technology

However, new problems are caused by this. Whenever a lightning strike voltage occurs, the shedding device will also be detonated, and the shedding device will be frequently replaced.

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