1. What is charging protection?
When the circuit breaker where the device is located is used to charge components such as the busbar and is connected to a faulty component, there is charging protection as a protection in this situation. The charging protection consists of two sections of two-time phase overcurrent and one section of zero-sequence overcurrent composed of phases. The current is taken from the TA of this circuit breaker.

2. What is dead zone protection?

A brief explanation of the dead zone: The following fault at K1 is within the I bus protection zone, but after the I bus protection action trips all I bus circuit breakers including 1DL, the fault point is still in the system. This type of fault is a dead zone fault. .

Action of dead zone protection: three-phase trip signal (for example: three tripping of transformer, three tripping of line, or three split-phase tripping of A, B and C at the same time) + three-phase trip (TWJ signal) + dead zone current action , the dead zone protection is started after the dead zone delay.