To repair the difference between the grounding switch and the fast grounding switch - News - Global IC Trade Starts Here.

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The maintenance grounding switch is installed next to the isolating switch on both sides of the circuit breaker, and its main purpose is to ground both sides of the circuit breaker during maintenance. This ensures safe working conditions for technicians by eliminating residual voltage and preventing accidental energization.

The fast grounding switch is typically located on the line side of the outgoing disconnecting switch in an outgoing circuit. It serves two primary functions: first, it can open and close parallel overhead lines that may generate capacitive current due to electrostatic induction or electromagnetic coupling; second, if there is a flashover or internal arcing inside the outer casing, the fast grounding switch quickly grounds the main circuit, allowing the circuit breaker to interrupt the fault current effectively.

The coordination between the circuit breaker and the fast grounding switch can be analyzed from two perspectives: tripping and reclosing.

1. In terms of tripping, the process is relatively straightforward. When a single-phase fault occurs on the line, the switches on both sides of the faulty phase are disconnected. However, due to electromagnetic coupling between the healthy phase and the faulty phase, a potential supply current may appear, which can hinder arc extinction and increase the sub-transient current. To address this, once the switches are opened, an automatic device immediately closes the fast grounding switch on both sides, helping to rapidly extinguish the arc.

2. The most effective use of the fast grounding switch is in conjunction with the circuit breaker during the reclosing process. Here’s how it works:
(1) A single-phase grounding short-circuit occurs, resulting in an arc.
(2) The circuit breakers at both ends of the faulty phase trip, causing the initial arc to be extinguished, but a secondary arc (sub-transient arc) may still exist.
(3) The fast grounding switch on the faulty phase is activated, grounding the circuit and extinguishing the secondary arc.
(4) Once the arc is fully extinguished, the fast grounding switch is opened.
(5) Finally, the circuit breaker performs a reclosing operation, restoring power to the line.