Fault positioning method of complicated distribution line

Abstract

The present invention discloses a fault positioning method of a complicated distribution line. The method comprises a step 1 of carrying out the mathematical modeling on the distribution line, and establishing the T nodes, wherein the T nodes comprise the actual T nodes established by the connection points of the actual branch lines and the virtual T nodes established by the parameter segments of different lines; a step 2 utilizing a database to store the mode information of the plant-stations of a power grid, the system equivalent impedance and the parameter information of the distribution network lines; a step 3 determining the possible positions of the fault points in a main line according to a fault current, a system parameter and the electrical circle of each T node; deciding the branch line in which the fault concretely and possibly occurs according to the branch line impedance. The fault positioning method of the present invention realizes the distribution line fault accurate positioning just by the system equivalent impedance and a line virtual T node model, enables the distribution line patrol efficiency to be improved greatly, the distribution network scheduling instructions to be enriched and the fault patrol time to be shortened, and has the important significance for improving the distribution network power supply reliability and reducing the distribution network potential safety hazards.

Description

technical field [0001] The invention relates to the technical field of fault location of power distribution lines, in particular to a fault location method for complex power distribution lines, which is a fast fault location method for complex lines with mixed type lines and multi-branch lines. Background technique [0002] The safe operation of the distribution network is closely related to the interests of users. A robust and intelligent distribution network is the development trend of the power grid today. How to ensure the safe and reliable operation of the distribution network and reduce the power outage time of the distribution network has become an important issue for the current power grid. Power outage due to distribution network failure is the main cause of power loss in distribution network. The length of inspection time after a fault becomes a key factor affecting power recovery. This system aims to quickly and accurately locate faults to ensure reliable power sup...

AI Technical Summary

Problems solved by technology

In the conventional line inspection method, the dispatcher directly issues dispatching instructions according to the faulty line, and the line management unit conducts a purposeless full-line inspection of the entire line, wasting a lot of manpower and material resources

Especially when a short circuit occurs near the end of a long-distance line, it will take a lot of time to start patrolling from the head end of the line, delaying the time to solve the fault, and then delaying the power recovery time, increasing the loss of power, and reducing the satisfaction of power users

At present, most of the distribution network devices cannot provide fault location information. Even if they can provide it, it is only a rough calculation for the main line, and the accuracy is not enough to support the auxiliary decision-making of dispatching, and a large number of fault location hardware are installed in complex distribution network lines. The device consumes a lot of capital, and the application of this method has strong practical significance

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