Voltage-type power distribution network fault processing method

Abstract

The invention provides a voltage-type power distribution network fault processing method. When a line fault occurs and tripping is generated, a master station firstly judges whether the line fault is a fault on a user side or not, if the line fault is the fault on the user side, a user demarcation switch is tripped so as to isolate the user fault, and meanwhile the section is displayed in a green power failure state on the master station; if the line circuit is not the fault on the user side, a voltage-type feeder automation processing mode is started; the master station judges the region between a last-level fault indicator reporting fault signals and a first-level fault indicator not reporting the fault signals as a fault region, and the fault region is displayed on an upper computer of the master station. According to the voltage-type power distribution network fault processing method, real-time display of the fault region is achieved, the simple and clear fault region is provided for distribution network control staff while the faults are automatically processed and non-fault section region power transmission is restored, and power supply restoration of the fault region is accelerated; through the user demarcation switch, the user fault is prevented from spreading to a main circuit, and the fault power failure range is reduced.

Description

technical field [0001] The invention relates to the field of grid faults, in particular to a fault handling method for a voltage-type distribution network. Background technique [0002] The voltage-type distribution automation equipment has been widely used in different types of power supply areas of the distribution network because of its advantages of not relying on communication and automatically handling faults on the spot. Ideally, after a permanent fault causes a power outage on the line, the identification of the faulty section by the distribution network control personnel of the main station mainly depends on the "blocking signal" sent by the voltage-type feeder automation equipment, or the main station through the general call command "blocking signal". Signal", the feeder section between the two devices that send the "blocking signal" is taken as the fault section. However, since the voltage type switch has no battery, the capacitor can only support the time of ab...

AI Technical Summary

Problems solved by technology

However, because the voltage type switch has no battery, the capacitor can only support the time of about 50s, and it is often difficult to completely send the switch opening and closing position and the locking signal, so that the distribution network control personnel cannot judge the fault area

According to statistics, about 60% of line faults are user faults. However, the existing voltage-type lines cannot judge user faults and can only deal with trunk line faults.

[0003] At present, the troubleshooting of fault points mainly relies on the operator of power distribution equipment to manually inspect the entire distribution line, and then carry out emergency repairs after inspection of the fault point, so as to restore power supply to users in the fault area, but generally the length of a 10kV distribution line is More than 2km, the inspection time is longer than half an hour or even longer, resulting in delays in follow-up fault repair work, affecting the restoration of power supply for users in the fault area, and causing direct or indirect economic losses

For more important users, the loss is particularly large

Moreover, voltage-type equipment can only deal with short-circuit faults between phases, but cannot deal with ground faults. When a ground fault occurs, it is impossible to grasp the approximate section of the fault, and can only rely on manual inspection of the entire distribution line

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