Local smart feeder automation no-delay stage difference coordination method and application

Abstract

The invention relates to a local smart feeder automation no-delay stage difference coordination method and application. The advantage of local insulation of relay protection and the advantage of self-recovery of feeder automation are combined, when a circuit breaks down, preferentially, local insulation is conducted through the relay protection function of a feeder terminal, and thus the outage range is reduced to the maximum degree. If transformer substation protection time has a low time-delay margin or does not have a time-delay margin, it is difficult for a transformer substation and the feeder terminal to form delay stage difference coordination to ensure protection selectivity. At this time, through a local smart failure processing mode of the feeder terminal, local failure processing can be completed, no in-station power supply is influenced, and in-station protection simply serves as backup protection of feeder protection. If instant quick break protection is applied to the transformer substation, the portion where a first-stage section switch is located needs to be protected, and the coordination is formed through a protection range.

Description

technical field [0001] The invention relates to the field of wiring fault inspection and maintenance, in particular to an on-site intelligent feeder automatic non-delay step-difference matching method and mode application. Background technique [0002] Feeder automation is the use of automation devices or systems to monitor the operating status of the distribution network, detect faults in the distribution network in time, and perform fault location, isolation, and restoration of power supply to non-faulty areas. In recent years, for different types of power supply areas, the construction of intelligent distribution network adopts the principle of differentiation, and the fault handling of feeder automation can adopt centralized and local models. Local feeder automation does not rely on communication, and completes fault handling through equipment self-protection or timing cooperation. The traditional recloser-type feeder automation is divided into voltage time type, voltag...

AI Technical Summary

Problems solved by technology

[0006] (1) Any point of failure in the distribution line will cause the outlet switch of the substation to trip, which will cause a power outage on the whole line, expand the power outage area, and reduce the reliability of power supply;

[0007] (2) When the distribution line is permanently faulty, the outlet switch of the substation must be reclosed twice before the power supply can be restored, that is, the non-faulty area will experience two short-term power outages;

[0008] (3) If a fault occurs near the outgoing line end, the short-circuit current is large, and the secondary coincidence will have a large impact on the primary equipment of the substation, reducing the service life

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