Fast Vacuum Contactors

The bypass switch remains closed for extended periods, short-circuiting the resistor within the mitigation device. This allows the transformer to operate stably under its original grounding configuration.

AC and DC instrument transformers collect electrical data in real-time and upload it to the intelligent control unit, keeping the system in a standby monitoring state.

When the monitored DC component in the grid reaches a preset threshold, the intelligent control unit issues a command. The high-speed bypass switch opens, automatically putting the mitigation device into operation to effectively suppress the DC component.

* If an asymmetric short-circuit fault occurs while the device is in operation.

* The fault current flowing through the neutral point of the main transformer causes a sharp rise in voltage across the resistor.

* When the voltage reaches the breakdown level of the protective gap, the gap ionizes and breaks down, clamping the voltage across the resistor within a safe range.

* As the short-circuit current drops to its first zero-crossing point, the high-speed bypass switch executes a phase-controlled closing. This shunts the short-circuit current through the switch body, protecting the resistor and the equipment.

* Grid-connected distributed renewable energy and grid interconnection.

* Power supply security for urban power grids.

* Power supply for offshore platforms.

* Power supply for independent remote island.