Same tower double back transmission line fault distance measuring time domain method using single end current flow

A transmission line, fault location technology, applied in the fault location, emergency protection circuit device, electrical components and other directions, can solve the problem of not considering arc fault, not considering the time-varying characteristics of transition resistance, etc.

Inactive Publication Date: 2008-08-27
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

However, the above ranging methods do not consider the time-varying characteristics of the transition resistance, that is, the arc fault is not considered, but the fault resistance is regarded as a constant resistance

Method used

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  • Same tower double back transmission line fault distance measuring time domain method using single end current flow
  • Same tower double back transmission line fault distance measuring time domain method using single end current flow
  • Same tower double back transmission line fault distance measuring time domain method using single end current flow

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Experimental program
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Effect test

Embodiment

[0072] 1. According to figure 2 The current at the fault point can be found:

[0073] suppose figure 1 If there is a fault in the middle line II, then according to the circuit principle, it can be known that i If = 0, the relationship between the same vector and the reverse quantity at the fault point is obtained by formula (1):

[0074] i Ft =-i Ff (1)

[0075] From this, the fault current i on the line II can be obtained IIF for:

[0076] i IIF = i Ft -i Ff =-2i Ff (2)

[0077] according to figure 2It is known from literature [1] that in high-voltage and ultra-high-voltage transmission systems, the reactance of lines and systems is far greater than the resistance, and reactance plays a decisive role, so there are:

[0078] i 2fs / i 1fs = k (3)

[0079] In the formula, K is a constant, and the simulation shows that this assumption has little influence on the ranging results. according to figure 2 (b) can get:

[0080] i Ffs = i 1fs -i 2fs...

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Abstract

Disclosed is a fault distance time domain detection method based on magnitude of single end current for a double power transmission lines within the same tower, belonging to the technical field of relay protection for electric power system. In the method, the coupled double transmission lines are decoupled into a same directional component and an reverse directional component, and the voltage and the current at the fault point are worked out according to the voltages at the two ends of the reverse directional component, and the fault distance measurement can be realized according to the transfer characteristics of the arc voltage current. Making the best use of the characteristics of a reverse network, the method measures the distance based on that the reverse network are irrelative to the impedance of the system, and only uses time domain single end current to measure the fault distance; the method is simple and overcomes the influence from the impedance of the reverse system in the past. Since the time domain method is dispensed with wave filtration, the required data window in small. A large number of numeral simulation results show that the method is effective and reliable.

Description

technical field [0001] The invention relates to a time-domain method for fault distance measurement of double-circuit transmission lines on the same tower by using single-end current, and belongs to the technical field of electric power system relay protection. Background technique [0002] There is mutual inductance not only between phases but also between lines for double-circuit lines on the same pole, and it is accompanied by the problem of cross-line faults, which increases the complexity of fault location for double-circuit lines. At present, there are still many problems in the distance measurement of double-circuit line faults. (reference 1). After long-term research, a variety of methods have been formed in the fault location of double-circuit lines, which can be divided into two categories according to the use of electrical quantities: single-ended method (references 3-6) and double-ended method (references 7-9) . Document [3] constructs a ranging method by equa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26G01R31/08
Inventor 束洪春刘振松董俊孙士云唐岚刘志坚孙向飞刘可真杨毅常勇单节杉刘永春
Owner KUNMING UNIV OF SCI & TECH
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