T-connecting line fault range finding method

Abstract

The present invention relates to a T-connecting line fault range finding method. The method comprises: determining whether a T-connecting line is a three-terminal operation mode or a two-terminal operation mode or not, and performing fault range finding according to the operation mode of the T-connecting line. When the T-connecting line is the three-terminal operation mode, if faults happen on a certain branch, the voltage and the current correlated to a T node are calculated to employ double-terminal range finding algorithm to obtain the accurate positions of fault points. When the T-connecting line is the two-terminal operation mode, the fault distances between each terminal and the fault points are calculated in the two operation terminals, if the faults happen on the T node or a non-operation branch, the two operation terminals are subjected to single-terminal range finding so as to determine whether the faults happen on the T node or the non-operation branch, and if the faults happen on the non-operation branch, the single-terminal range finding is performed again to obtain the accurate positions of the fault points. Therefore, whatever the T-connecting line is operated in any mode, The T-connecting line fault range finding method can accurately obtain the positions of the fault points to facilitate subsequent fault solution.

Description

technical field [0001] The invention relates to a T-connection line fault ranging method. Background technique [0002] T-connection lines can ease the transmission corridor, save land resources, and have good economic benefits. They are more and more used in high-voltage power grids. T-connection lines usually have two operation modes: three-terminal operation mode and two-terminal operation mode. The three terminals of the T-connection line are M terminal, N terminal and S terminal respectively. figure 1 and figure 2 They are a schematic diagram of a three-terminal operation mode and a schematic diagram of a two-terminal operation mode, wherein the two ends of the operation are the M-terminal and the N-terminal respectively. [0003] Once the T-connection line fails, it will cause a large-scale power outage. It is of great significance to the power system to find the fault point accurately and quickly through fault location and then eliminate the fault. Neither the tr...

AI Technical Summary

Problems solved by technology

Neither the traditional single-ended ranging nor the double-ended ranging can adapt to the T-connection line. Due to the existence of branches, the traditional single-ended ranging has the problem of boosting, which leads to inaccurate ranging and is greatly affected by the transition resistance; the traditional double-ended Although end-to-end distance measurement can not be affected by transition resistance, it is not suitable for T-connection lines

Moreover, the traditional T-connection line fault location method cannot reliably detect the fault distance of the T-connection line

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