As a portable power supply device, a diesel generator can provide a limited range of power supply and can be easily replaced in places where it is used. Thunderstorms can be placed indoors, but sometimes diesel generator sets are used outdoors and encounter severe weather conditions. When it comes to the lightning protection of the equipment, what specific steps are needed to protect the lightning protection of the generator?
First of all, it is necessary to determine the lightning protection mode of the generator mainly based on the size of the generator capacity, the strength of the local lightning activity, and the requirements on the reliability of the power supply.
Theory and practice have proved that generators that are connected to overhead transmission lines through transformers, as long as the transformers are reliably protected, generally do not need lightning protection measures for the generators. In the multi-relief areas, there is no special special for overhead wiring. Important generators should be equipped with a set of magnetic lightning arresters on the outgoing line of the generator to prevent the lightning wave on the high voltage side of the transformer from jeopardizing the insulation of the generator through the transformer.
The generator directly connected to the overhead distribution line must be protected against lightning. According to the provisions of the national standard design code, different lightning protection measures shall be taken for generator insulation in different situations. The surge arrester used for protecting high-voltage rotating electrical machines generally uses a magnetic discharge arrester, and the arrester should be installed close to the generator. Under normal circumstances, the arrester can be installed at the outlet of the motor; if no more than two generators are connected to each group of buses, or the capacity of a single machine does not exceed 500kw, and the distance from the arrester does not exceed 50m, the arrester can also be installed. On each group of busbars, when the neutral point of the direct-distribution motor can be led out and not grounded directly, a magnetic blower or common valve arrester should be installed at the neutral point. Outdoor use of generator equipment must pay attention to lightning protection to ensure personal safety.
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