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Function of lightning arrester
Source: | Author:lurensi | Published time: 2021-05-10 | 1529 Views | Share:

The lightning arrester is connected between the cable and the earth, and is usually connected in parallel with the protected equipment. Lightning arrester can effectively protect communication equipment. Once abnormal voltage occurs, the lightning arrester will act and play a protective role. When the communication cable or equipment operates under normal working voltage, the lightning arrester will not work and is regarded as open circuit for the ground. In case of high voltage and endangering the insulation of the protected equipment, the lightning arrester acts immediately to guide the high-voltage impulse current to the earth, so as to limit the voltage amplitude and protect the insulation of communication cables and equipment. When the overvoltage disappears, the lightning arrester quickly returns to the original state to make the communication line work normally.

Therefore, the main function of lightning arrester is to cut the amplitude of intrusion flow wave through parallel discharge gap or nonlinear resistance, and reduce the voltage value of protected equipment, so as to protect communication lines and equipment.

The lightning arrester can be used not only to protect the high voltage generated by lightning, but also to protect the high operating voltage.

The function of lightning arrester is to protect various electrical equipment in power system from lightning

An electrical appliance damaged by voltage, operating overvoltage and power frequency transient overvoltage impact. The types of arresters mainly include protective gap, valve arrester and zinc oxide arrester. The protection gap is mainly used to limit atmospheric overvoltage and is generally used for the protection of distribution system, line and incoming section of substation. Valve arrester and zinc oxide arrester are used for the protection of substation and power plant. In 500kV and below systems, they are mainly used to limit atmospheric overvoltage. In EHV systems, they will also be used to limit internal overvoltage or as backup protection for internal overvoltage.