Arc protection system and method having selective trip-out function

Abstract

The invention discloses an arc protection system and method having selective trip-out function. A cable chamber and a switch chamber of a feed line switchgear are separately configured with an arc probe, which is connected to an arc replay. When the arc replay monitors that the cable chamber and the switch chamber have arc faults and current determining criteria are met, the system directly trips out a circuit switch, and at the same time the arc replay transmits a fault system to an arc master control unit. If after a feed line switch trips out, the arc master control unit still monitors the presence of a fault current, after 70-150 ms (settable), trips out a main transformer low tension switch or a section switch based on the logic set by the arc master control unit. A bus chamber configures the arc probe to be directly connected to the arc master control unit, and if the arc probe of the bus chamber monitors an arc action, and the arc master control unit determines that the current criteria are met, then the arc master control unit trips out the main transformer low tension switch or the section switch based on the logic set by the arc master control unit. Selective trip-out is realized when different positions of the feed line switchgear have faults.

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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