An Accurate Judgment Method of Transmission Line Fault Based on Recorded Wave Data

Abstract

The invention discloses a recording data-based power transmission line fault accurate judgment method. The method comprises the following steps of: S1, bus-bar automatic matching; S2, zero-sequence analog signal reverse connection intelligent identification and correction; S3, whole analog signal-based circuit breaker tripping judgment; S4, boundary prediction method-based fault reference point screening; and S5, bus-bar voltage disturbance feature identification-based anti-error locking. The method of the invention can adapt to the random change of the operation mode of a power grid and is compatible with channel reverse connection phenomena which easily occur in field electrical construction. With the method adopted, the problem of inadequate judgment basis caused by the absence and incompleteness of core state quantity signal configuration parameters can be solved; the problem of high unreliability of a method using a single fault reference point in the prior art can be solved; threats imposed by the interference of a variety of kinds of simulation signals in a substation test can be eliminated; the accuracy of fault line judgment can be greatly improved; and the requirements of the management and operational characteristics of a power system can be well satisfied.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a method for accurately judging transmission line faults based on recorded wave data. Background technique [0002] As a "black box" for substation operation records, each oscilloscope can monitor multiple transmission lines (also known as lines) at the same time. Taking a 220kV substation as an example, it is stipulated that the number of transmission lines monitored by each oscilloscope is 6 to 8, and as many as 30 digital recorders used in smart substations. About 95% of power grid faults occur on the transmission line, forming a short-circuit effect. Due to the sensitivity of the oscilloscope recording, whether it is a normal disturbance of the power grid or a transmission line fault, the relevant data will be recorded and analyzed by the oscilloscope. When the transmission line is faulty, the electrical quantities of several adjacent lines will also show similar cha...

AI Technical Summary

Problems solved by technology

With the rapid development of experimental equipment manufacturing capabilities and algorithm theory level, the substation site has been able to simulate various signals that are extremely close to the real power grid fault scene on the secondary circuit, not only reflected in the fidelity of the analog signal, but also the status signal. There is almost no difference in the action logic and timing changes. Even if manual identification is difficult, once a misjudgment is caused, the consequences will be very serious.

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