Nonsynchronous fault range-finding method for double-circuit line, comprising series compensation, on same tower

A technology of series compensation and fault location, which is applied in the electrical field, can solve problems such as double-circuit lines that are rarely studied, and achieve the effect of simple ranging principle

Active Publication Date: 2016-11-16
SHANDONG UNIV
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Problems solved by technology

[0004] Many scholars at home and abroad have studied the fault location of series c

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  • Nonsynchronous fault range-finding method for double-circuit line, comprising series compensation, on same tower
  • Nonsynchronous fault range-finding method for double-circuit line, comprising series compensation, on same tower
  • Nonsynchronous fault range-finding method for double-circuit line, comprising series compensation, on same tower

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Embodiment Construction

[0043] The present invention is described in detail below in conjunction with accompanying drawing:

[0044] The distribution parameter model and phase sequence transformation of the double circuit line with series compensation used in the application are explained as follows:

[0045] There are phase-to-phase coupling and line-to-line coupling on the double circuit line on the same pole. When series compensation equipment is installed on the double circuit line, the line can still be decoupled using the six-sequence component method. Considering that the series compensation line is generally long, this paper adopts the distributed parameter line model. figure 1 Among them, SC is the series compensation device, and the metal oxide variable resistor MOV is the main protection; M and N are the busbars on both sides of the system, Z M ,Z N are the system impedances on both sides, respectively; and Respectively, the voltage measured by the protection on both sides of M and N...

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Abstract

The invention discloses a nonsynchronous fault range-finding method for a double-circuit line, comprising series compensation, on the same tower, and the method comprises the steps: employing a six-sequence component method for decoupling for each sub-algorithm, and eliminating a series compensation voltage at a side nearby a fault and series compensation currents at two sides in a transmission equation according to the characteristics that the voltages, deduced from two sides, of a fault point are equal and the currents at two sides of a series compensation device meet the Kirchhoff's Current Law; constructing a fault positioning function through employing the pure resistance of a transition resistor at the fault point when the double-circuit line on the same tower comprises the series compensation; inputting double-end data into an M-side sub-algorithm and an N-side sub-algorithm at the same time for calculation, and directly achieving the precise positioning of a fault without the discrimination of a fault section. The method is applicable to all types of faults, does not need to carry out synchronous sampling, is independent of a series compensation device model, is not affected by MOV nonlinearity, does not need to know the position of the fault point relative to the series compensation in advance, is simple in range-finding principle, just needs to carry out the one-dimensional search of the fault distance, and does not have a problem of false root discrimination.

Description

technical field [0001] The invention relates to the field of electrical technology, in particular to a non-synchronous fault distance measuring method for parallel double-circuit lines on the same pole including series compensation. Background technique [0002] EHV and UHV lines equipped with series capacitor compensation devices (series compensation) have long transmission distances and are often connected to large power plants and load centers. Failure to repair faults in time may cause serious losses; series compensation capacitors generally use non-linear The metal oxide varistor (MOV) with volt-ampere characteristics is used for overvoltage protection. Due to the existence of nonlinear MOV, the conventional fault location method is no longer suitable for the double-circuit series compensation system. Therefore, there is an urgent need to study the adaptability of relay protection and fault location for double-circuit lines with series compensation on the same pole. ...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/085G01R31/086G01R31/088
Inventor 梁军张莹贠志皓
Owner SHANDONG UNIV
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