Discharge counter
Product Uses
The JS-8 discharge counter (hereinafter referred to as the discharge counter) is a device connected in series below the surge arrester to record the number of arrester operations. It is suitable for various surge arresters rated at 220 kV and below. The environmental conditions at the installation site shall be the same as those of the connected surge arrester; however, it is not suitable for locations subject to severe vibration.
The JS-8 discharge counter exhibits essentially the same electrical performance as the older JSY-10/600 model, with improvements made to the original design: the fragile glass housing has been replaced with a high-strength, transparent polycarbonate enclosure. The redesigned housing is aesthetically pleasing and offers excellent corrosion resistance, eliminating the need for paint during operation.
Structure and Performance
The discharge counter is primarily composed of a sampling valve disc, a silicon-bridge rectifier, a capacitor, an electromagnetic counter, and other components. It operates by utilizing the discharge current passing through the surge arrester to generate a voltage across the valve disc (a nonlinear resistor). This voltage is then rectified by the silicon-bridge rectifier to charge the capacitor, and the resulting DC current discharges into the coil of the electromagnetic counter, causing the counter to be energized and register one count. In this way, the number of arrester operations is recorded. The electrical principle is illustrated in the figure.
In the figure: BL—lightning arrester; C—capacitor; L—electromagnetic counter; Z—silicon bridge rectifier; R—sampling valve disc.
Implementation Standard
GB/T10492
External Dimensions and Mounting Dimensions (mm) of JS-8 Type Discharge Counter
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No. 95, West Section of Shiji Road, Pulandian District, Dalian City, Liaoning Province
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