Overview:

The JS8 and JS8A discharge counters (hereinafter referred to as counters) are installed in series below the surge arrester and are devices used to record the number of actions of the surge arrester. The JS8 type is applicable to voltage levels from 6KV to 220KV. The JS8A type is applicable to valve surge arresters with a voltage level of 330KV and above. The environmental conditions at the installation location are the same as those of the connected surge arrester. The altitude does not exceed 4000 meters, and the ambient temperature ranges from -40℃ to +40℃. It is not suitable for places with severe corrosion of metals and insulating parts, with severe pollution, and with strong vibrations.

Structure and Performance

The discharge counter is mainly composed of components such as varistors, silicon bridge rectifiers, capacitors, and electromagnetic counters. It uses the energy passing through the surge arrester (impulse current and power frequency current) to take voltage on the varistor (non-linear resistor), charge the capacitor unidirectionally through the silicon bridge rectifier, and discharge the electromagnetic counter coil with direct current, causing the counter to move once, thus recording one action to achieve the recording of the number of actions.