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

A technology of feeder automation and differential coordination, which is applied in the direction of automatic disconnection emergency protection devices, electrical components, circuit devices, etc., can solve problems such as large short-circuit current, reduce power supply reliability, and reduce service life, and achieve the effect of avoiding impact

Inactive Publication Date: 2018-10-16
西安兴汇电力科技有限公司
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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

Method used

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Embodiment Construction

[0044] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0045] The on-site intelligent feeder automation without delay level difference coordination method requires that the intelligent terminals of the distribution line all use circuit breakers, with three-stage overcurrent protection functions, closing when there is pressure delay, reclosing at fault locking, short-time opening and locking, Delayed automatic unlocking function, and also has ground fault judgment and protection functions.

[0046] Since the non-delay step-difference coordination method is suitable for substations with small delay margin or no delay margin, it is suitable for the coordina...

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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...

Claims

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Application Information

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IPC IPC(8): H02H7/26H02H3/06
CPCH02H7/26H02H3/06
Inventor 郭琳云梅成磊刘荣声郑宇翔孙锐魏恒星高考
Owner 西安兴汇电力科技有限公司
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