Two-stage protection configuration and fixed value setting method for single-power-supply 10 KV line

Abstract

The invention provides a two-stage protection configuration and fixed value setting method for a single-power-supply 10 KV line. The main trunk of the 10 KV line is provided with a section switch. The distribution network protection is divided into two stages. The first-stage protection is the protection for the outgoing line switch of a transformer substation. The second-stage protection is the protection for the section switch. The outgoing line switch and the section switch are respectively subjected to the protection and the setting calculation. According to the technical scheme of the invention, the protection and the setting calculation are configured according to the above method, so that the reliable resection of a fault is realized. Meanwhile, when a fault occurs at the rear-end circuit of the section switch, the tripping operation of the outgoing line switch of the circuit is avoided. Therefore, the front-end circuit of the section switch is not influenced at all. If a special small branch line fails, only the small branch line is cut off. In this way, the normal power supply for the other parts of the circuit is not influenced at all. The two-stage setting method is clear in level, and convenient and simple in setting. The power supply reliability of the 10 kV line can be greatly improved.

Description

technical field [0001] The invention relates to a two-stage protection configuration and fixed value setting method for a single-power 10-kilovolt line, which belongs to the technical field of power grid lines. Background technique [0002] A single power supply line refers to a 10 kV line with only one side connected to the substation and the other side extending from the substation through the outlet switch. In order to reduce the scope of power outages in the event of a fault, the operation and maintenance department will generally set up a section switch on the main line of the single-power 10 kV line. There is no uniform method for setting and calculation of the fixed value, so that the section switch and the outlet switch often cannot be effectively coordinated. When a fault occurs on the 10kV distribution network line, the section switch and the substation outlet switch trip at the same time, and the section switch cannot realize fault isolation. , Reduce the scope o...

AI Technical Summary

Problems solved by technology

In order to reduce the scope of power outages in the event of a fault, the operation and maintenance department will generally set up a section switch on the main line of the single-power 10 kV line. There is no uniform method for setting and calculation of the fixed value, so that the section switch

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