Recording data-based power transmission line fault accurate judgment method

A technology of recording wave data and transmission lines, applied in the field of electric power, can solve problems such as difficulties in manual identification, and achieve the effect of getting rid of dependence, flexibility and reliability

Active Publication Date: 2017-08-04
YUNNAN POWER GRID +1
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  • Abstract
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  • Application Information

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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 on

Method used

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  • Recording data-based power transmission line fault accurate judgment method
  • Recording data-based power transmission line fault accurate judgment method
  • Recording data-based power transmission line fault accurate judgment method

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Embodiment Construction

[0067] The present invention will be further described below in combination with specific embodiments.

[0068] Such as figure 1 , the present invention proposes a method for accurately judging transmission line faults based on recorded wave data, comprising the following steps:

[0069] S1. Busbar automatic matching: When the transmission line fails, the current value of the short-circuit point of the fault phase increases sharply, and the voltage value decreases to varying degrees. The closer the short-circuit point is to the wave recorder, the greater the decrease in voltage value. The attenuation of the voltage value during a fault can automatically match the real busbar connected to the faulty line. The steps are as follows:

[0070] A1. Determine the voltage level of the line according to the initially connected bus, and then screen out all the buses with the same voltage level, and include them in the bus alternative echelon;

[0071] A2. Calculate the voltage attenu...

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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...

Claims

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Application Information

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IPC IPC(8): G01R31/08
Inventor 李本瑜张琳波石恒初廖晓春游昊方毅杨远航陈剑平罗吉张鑫沈雨袁磊李辉明邓碧青
Owner YUNNAN POWER GRID
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