The role of lightning arrester

The lightning arrester is connected between the cable and the ground, usually in parallel with the protected equipment. The lightning arrester can effectively protect the communication equipment. Once an abnormal voltage occurs, the arrester will act and play a protective role. When the communication cable or equipment is running under the normal working voltage, the arrester will not have any effect, and it is regarded as open circuit to the ground. Once high voltage occurs and the insulation of the protected equipment is endangered, the arrester will act immediately to direct the high-voltage impulse current to the ground, thereby limiting the voltage amplitude and protecting the insulation of communication cables and equipment. When the overvoltage disappears, the arrester quickly returns to its original state, allowing the communication line to work normally.

Therefore, the main function of the arrester is to clip the intruding flowing wave through the parallel discharge gap or nonlinear resistance, reduce the overvoltage value of the protected equipment, and protect the communication line and equipment.

Lightning arresters can be used not only to protect against high voltages generated by lightning, but also to protect against operating high voltages.

The function of the lightning arrester is to protect various electrical equipment in the power system from being damaged by lightning surge arrester type voltage, operating overvoltage, and power frequency transient overvoltage. The main types of arresters include protective gaps, valve arresters and zinc oxide arresters. The protective gap is mainly used to limit the atmospheric overvoltage, and is generally used for the protection of the power distribution system, the line and the incoming line of the substation. Valve-type arresters and zinc oxide arresters are used for the protection of substations and power plants. In 500KV and below systems, they are mainly used to limit atmospheric overvoltages. In ultra-high voltage systems, they will also be used to limit internal overvoltages or as internal overvoltages. Backup protection.

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