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Mixed type method of multi-terminal circuit fault location

A line fault and hybrid technology, applied in the direction of fault location, etc., can solve the problems of reducing the performance of fault location technology and limiting accuracy, and achieve the effects of high accuracy, high cost efficiency, and high precision

Active Publication Date: 2013-07-10
DEZHOU POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER +1
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AI Technical Summary

Problems solved by technology

Unnecessary simplification of the line model inevitably limits the accuracy that this fault location technique can achieve, and ignoring important information can further degrade the performance of the fault location technique

Method used

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  • Mixed type method of multi-terminal circuit fault location
  • Mixed type method of multi-terminal circuit fault location
  • Mixed type method of multi-terminal circuit fault location

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Embodiment Construction

[0028] The adopted technical solution will be further elaborated below according to the accompanying drawings.

[0029] Such as figure 1 As shown, the length of the line is represented by l, the length of the fault point from the sending end s is d, and the length from the receiving end r is l-d.

[0030] According to the symmetrical component voltage, current and characteristic impedance of the sending end, the symmetrical component voltage of the fault point can be calculated as follows:

[0031] V fs,1 =V s,1 cosh(dγ 1 )-I s,1 Z c1 sinh(dγ 1 )

[0032] V fs,2 =V s,2 cosh(dγ 2 )-I s,2 Z c2 sinh(dγ 2 )

[0033] V fs,0 =V s,0 cosh(dγ 0 )-I s,0 Z c0 sinh(dγ 0 )

[0034] Among them, sinh() and cosh() are hyperbolic sine and hyperbolic cosine functions;

[0035] V s,1 , V s,2 and V s,0 Indicates the positive sequence, negative sequence and zero sequence voltage measured at the sending end;

[0036] I s,1 , I s,2 and I s,0 Indicates the positive sequen...

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Abstract

Disclosed is a mixed type method of multi-terminal circuit fault location. The method comprises the following steps: step 1, symmetrical component voltage of a fault point is calculated according to symmetrical component voltage and current of a sending terminal; step 2, the symmetrical component voltage of the fault point is calculated according to symmetrical component voltage and current of a receiving terminal; step 3, delta is supposed to be a phase angle of the sending terminal lagging behind the receiving terminal, d is supposed to be the fault distance, and the phase angle displacement delta and the fault distance d are obtained through an iteration mode by using weighted least squares (WLS); step 4, sequence voltage and phasor voltage of a fault position can be measured and calculated from voltage and current at two terminals according to obtained fault points and phase angle difference; step 5, a threshold value Ith is set through the sum of the fault current and a pre-confirmed constant C, and the type of a fault is confirmed; and step 6, fault resistance is obtained by calculating the current and the voltage of the fault position.

Description

technical field [0001] The invention relates to a method for locating line faults, in particular to a hybrid method for locating multi-terminal line faults. Background technique [0002] Power companies must provide reliable power services to a wide range of customers and reduce operating costs, however, this goal is threatened by the continuous occurrence of abnormal conditions such as grid failures, severe grid failures as the grid ages and the demand for electricity continues to grow. In order to prevent damage to power system equipment and reduce power outage time, transmission line faults must be quickly separated and removed. In the rapid restoration of power supply and the prevention of large-scale blackouts, fast and accurate fault location is very necessary. [0003] Fault location has been studied for several years, and different fault location techniques have been proposed. Generally speaking, fault location methods are divided into the following two categories: t...

Claims

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Application Information

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IPC IPC(8): G01R31/08
Inventor 苏建军夏滨袁桂华张瑞芳荆盼盼王连成
Owner DEZHOU POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER
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