Arc protection system and method having selective trip-out function

Abstract

The invention discloses an arc light protection system and method with a selective tripping function. Arc light probes are respectively arranged in the cable room and the switch room of the feeder switch cabinet and connected to the arc light relay. If there is a fault and the current criterion is met, the line switch will be tripped directly. At the same time as the switch trips, the arc relay will send the fault system to the arc main control unit. If the main control unit detects that the fault current still exists after the feeder switch trips, after 70 After ‑150ms (can be set), according to the logic set by the main control unit, jump the low-voltage side switch or section switch of the main transformer; the busbar room is equipped with an arc probe that is directly connected to the main control unit. When the unit judges that the current criterion is satisfied, the main control unit jumps the low-voltage side switch or section switch of the main transformer according to the set logic. Realize selective tripping when faults occur in different positions of the feeder switch cabinet.

Description

technical field [0001] The invention relates to the technical field of arc protection of relay protection systems, in particular to an arc protection system and method with a selective tripping function. Background technique [0002] With the continuous expansion of the grid capacity, the scale of the medium and low voltage power distribution system has also become larger, and the short-circuit capacity of the busbar has become higher and higher, while the medium and low voltage systems often use closed central cabinets to be led out by cables, and the operation is frequent and the operating current Large, high fault overvoltage, equipment manufacturing quality and safety distance are worse than high-voltage equipment, and insulation accidents are prone to occur. In recent years, there have been accidents where switchgear or busbars were burnt due to arcing due to insulation damage, operational errors, equipment aging, etc., causing major economic losses and personal injurie...

AI Technical Summary

Problems solved by technology

[0002] With the continuous expansion of the grid capacity, the scale of the medium and low voltage power distribution system has also become larger, and the short-circuit capacity of the busbar has become higher and higher, while the medium and low voltage systems often use closed central cabinets to be led out by cables, and the operation is frequent and the operating current Large, high fault overvoltage, equipment manufacturing quality and safety distance are worse than high-voltage equipment, and insulation accidents are prone to occur

In recent years, there have been accidents where switchgear or busbars were burned due to arcing due to insulation damage, operational errors, equipment aging, etc., resulting in major economic losses and personal injuries.

[0003] In the current arc protection scheme, most rely on the backup protection of the upper level protection device, and it is impossible to remove the fault before the arc burning hazard expands

The traditional arc protection is designed for the busbar. When arc light information is detected, the power supply of the entire system needs to be disconnected, which may cause the scope of power outage to expand. Therefore, how to consider selective tripping when arc faults occur in different locations is an urgent problem to be solved now.

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