Automatic feeder protecting method for overhead line four-section three-contact structure

Abstract

The invention discloses an automatic feeder protecting method for an overhead line four-section three-contact structure. When a trunk line of the overhead line four-section three-contact structure fails, a transformer substation outgoing breaker breaks, insulates failures and recloses after a distribution automation terminal determines a failure section. If the failures are permanent, subsection switches at the two ends of a feeder automation breakage failure section are started, a contact switch is closed, and non-failure section power is restored after tripping occurs again. When a branch line fails, after the distribution automation terminal determines a failure section, the transformer substation outgoing breaker and a failure section branch line breaker break and insulate failures, the transformer substation outing breaker recloses, and trunk line power supply is restored. The automatic feeder protecting method is high in power supply reliability, short in failure recovery time, small in power-off range, low in improvement, operation and maintenance cost, and suitable for areas which are provided with overhead lines and are high in reliability requirement.

Description

technical field [0001] The invention relates to an automatic protection method for an overhead line feeder with a four-section three-connection structure. Background technique [0002] Shanghai is the largest city in my country, one of the four central municipalities, and the center of my country's economy, finance, trade and shipping. In 2012, Shanghai's GCP reached 2.01 trillion yuan, ranking 11th in the world. The per capita GCP and per capita disposable income rank first in all provinces, autonomous regions and municipalities directly under the Central Government. Shanghai is currently in a critical period of "industrial transformation" and is striving to build "four centers" - an international economic center, an international financial center, an international trade center, and an international shipping center. This puts forward higher requirements for the city's power supply capacity. . [0003] Shanghai Pudong New Area covers an area of ​​1210.41 square kilometers...

AI Technical Summary

Problems solved by technology

[0007] 1. The section capacity of the overhead line is too large, and the connection is too small;

[0008] 2. Type III distribution stations built according to old standards do not conform to current technical principles;

[0009] 3. Atypical wiring exists in overhead lines

[0014] 4. The overall number of switching stations is relatively small, and the interval of 10kV is tight;

[0015] 5. There is a large ring network and a small ring network structure, which brings technical difficulties to the deployment of distribution automation;

[0016] 6. The horizontal connection of the network frame is weak, and the load transfer capacity of the network frame is limited

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