JS8、JS8A discharging counter (hereinafter short for counter) is connected under the arrester in serial, it is used for recording the operation times of arrester, JS8 type is applied for 6kV-22kV condition shall meet the requirement requirde by arrester, for example, the altitude should not exceed 4000m, the environment temperature is -40℃~+40℃, This counter can be put in the place that includes gas eroding metal and insulation parts or serious pollution and drastic vibration.

Structure and characteristic

Discharging counter is made up of valve element, silicon bridge type rectifier, capacitor, electromagnetic counter and so on, it makes use of the arrester energy (surge current and frequency current) to fetch the voltage on valve element (non linear resistance), then it charges to the capacitor in single direction through silicon bridge type rectifier, makes the coils of electromagnetic counter discharge with form of DC power to move the counter, thus, it can realize that the operating times can be recorded.