TRANSFORMER STATION HAVING LIGHTENING ARRESTER

摘要

PURPOSE: To equalize the voltage on each zinc oxide element by using the zinc element which can be used at an electric field higher than the conventional electric field by a specified number of times, and providing a lightening arresters having the discharge voltage, higher than that of a standard lightening arrester by specified %, in the vicinity of the opening end of a gas insulated switchgear. CONSTITUTION: For lightening arresters B1 and B2, zinc oxide elements, made of new composition that can be used in the electric field higher than the electric field used in standard lightening arresters A1 and A2 by about 1.5 times, are used. Therefore, the length of the lightening arrester B1 and B2 can be made shorter than the length of the lightening arresters A1 and A2 by 1/1.5 or less. Furthermore, the discharge voltage is made 10-30% higher. Therefore, the energy, absorbed by the lightening arresters B1 and B2 for the short-time overvoltage is less than that of the lightening arresters A1 and A2, and the size can be made compact. As a result, the voltages on the respective zinc oxide elements can be more equalized since the length of the lightening arrester B1 is shorter than the conventional value, and the transformer station, wherein insulation coordination is balanced as a whole and the reliability is high, is obtained.