The protection characteristics of the competitive lightning arrester are the basis for the insulation coordination of the protected equipment. Improving the protection characteristics of the competitive lightning arrester can improve the safety and reliability of the protected equipment, and can also reduce the insulation level of the equipment, thereby reducing the cost. The higher the voltage level of the equipment, the more significant the economic benefits brought about by reducing the insulation level.
The competitive lightning arrester is installed on the protected equipment, and the overvoltage is transmitted from the line to the competitive lightning arrester. When the value reaches the operating voltage of the arrester, the arrester operates to limit the overvoltage to a certain level (called the protection level). After the overvoltage, the arrester immediately returns to the cut-off state, and the power system returns to normal state.
The normal operating conditions of the competitive lightning arrester are:
①Suitable for indoor and outdoor operation;
②Ambient temperature is +40℃～-40℃;
③ can withstand the radiation of sunlight;
④ Altitude does not exceed its design height;
⑤ The frequency of the power supply shall not be less than 48Hz and not exceed 62Hz;
⑥The power frequency voltage applied to the competitive lightning arrester for a long time does not exceed the allowable value of the continuous operating voltage of the competitive lightning arrester;
⑦ Areas with an earthquake intensity of 7 degrees or below;
