General
JS>8.JSY-8 discharging countsr(hereinatter short as*countera)is connected under the arrester in serial.tt is used for recoding 1he operation times of arrester,JS8 type is applied for 6KV-220KV arrester. Bie environment ccndtion shall meet the requirement required by arrester.for exam pie ,the altitude doesn’t exceed 4000m,the environment Is -40X- +40°C. This counter cant be put In the place that Includes gas eroding metal and Insulation parts, 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. h makes use of lhe arrester energy (surge current and power frequency current) ta fetch th© vottage an valve element(non linear resistance), then It charges to the capacitor In single direction through silicon bridge type rectifier, makes the colla of electromagnetic counler discharge with form of DC power to move the counter .thus ,ft can realize ihat ihe operating times can be recorded.
The monitor is made up of silicon bridge type varistor .capacitor, resistors electromagnetic counter and so on, It use of the arrester energy (surge current and power frequency current) ta fetch the voltage on valve etement (non linear resistance).then It charges to the capacitor n single direction through silicon bridge type rectifier, makes the coils of electromagnetic counter discharge with fonn of DC power to move the counter .thus, It can realize that the operating times can be recorded.
The typical technical parameters of common outdoor pannel counter
| Typical model | Product’s dawrption | Voitago grade of system | Nominal Dischanje current (kV) | Motion current Range(kA) | Additional reeldual VoltaQB under Nominal currant (kV) | 2ms Sqare wave discharge Capacity (A) | High Current Withstand (kA) |
| JS-8 | Common counter | 3^6kV | 5 | 50-5000 | 1 | 400 | 65 |
| jco-n | Current type On-line monitor | 3-220KV | 10 | 60-6000 | 1 | 600 | 100 |
