The difference between line arresters and station arresters
Lightning flow after continuous flow only milliamperes power flow through the arrester, the continued flow in the first zero frequency arc extinguishing flow through the arrester, the circuit breaker does not trip, the system returned to normal. Lightning arrester volt second characteristic is lower than that of the insulator volt second characteristic. The volt second characteristic of a lightning arrester is about 15% lower than the volt second characteristic of the insulator when it is hit, and can be more than 20% lower than that of the counterattack.
The bus is the main lightning arrester protection voltage electrical equipment in substation are not violated, the volt second characteristic is lower than that of the substation equipment volt second characteristic curve. The transformers and other electrical equipment high voltage level is relatively weak, so the bus arrester turn-on voltage is lower than the line arrester.
Parallel connection of line lightning arrester and line insulator. When lightning arrester, lightning arrester residual pressure below 50% discharge voltage of the insulator string, even if the lightning current increases, the residual voltage of arrester only slightly increased, is not caused by flashover of insulator.
