Phase selection method for faults of double-circuit lines on same tower

A technology of line fault and double circuit on the same tower, applied in the fault location, instrument, measuring device, etc., can solve the problems of incomplete cross-line identification criteria, endangering the safe and stable operation of the power grid, and wrong selection of equals

Active Publication Date: 2015-01-07
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID +1
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Problems solved by technology

The cross-line fault of the same-tower line brings new challenges to the protection phase selection. The existing phase-selection scheme of the same-tower line has the problems of incomplete identification criteria for cross-line, complex logical judgment, and wrong selection. In severe cases, it will lead to protection rejection movement, malfunction, endangering the safe and stable operation of the power grid

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  • Phase selection method for faults of double-circuit lines on same tower
  • Phase selection method for faults of double-circuit lines on same tower
  • Phase selection method for faults of double-circuit lines on same tower

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Embodiment Construction

[0058] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0059] The fault phase selection method of double-circuit lines on the same tower in the present invention is as follows: figure 1 shown, including the following steps:

[0060] S1. Determine whether there is a ground fault

[0061] Calculate the magnitude of the zero-sequence voltage and judge whether it is a ground fault: if the action criterion is met, it will be judged as a ground fault and go to step S2; if the zero-sequence voltage does not meet the action criterion, it will be judged as a non-ground fault and go to step S4 ;

[0062] The zero-sequence voltage action criterion is:

[0063] u 0 > U 0.set (1);

[0064] Among them, U 0 Respectively, the current zero-sequence voltage amplitude; U 0.set is the zero sequence voltage threshold.

[0065] S2. Discrimination of ground fault type

[0066] After it is judged as a ground fault, calcul...

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Abstract

The invention discloses a phase selection method for faults of double-circuit lines on the same tower. The method includes the steps that the fault types and the fault phases are judged according to sequence voltage and voltage between phases, and different criteria are adopted for judging the physical fault phase of the local lines according to the fault type; the interphase impedance criterion and the ground impedance criterion are adopted for the two-phase grounding faults; the interphase impedance criterion and the impedance direction criterion are adopted for the two-phase non-grounding faults; the three-phase impedance direction is adopted for the three-phase faults. The phase selection method is simple and reliable in principle, the phase can be selected correctly under the single-return-wire faults and the overline faults, and the practical and feasible phase selection method is provided for protecting the lines on the same tower.

Description

technical field [0001] The invention relates to a phase selection method for faults of double-circuit lines on the same tower, and can also be used for other types of lines on the same tower. Background technique [0002] With the development of my country's power grid construction, the same-tower transmission technology has been widely used due to its advantages of small footprint, narrow transmission corridor, low investment cost, and large transmission capacity. Compared with traditional transmission lines, the same-tower line has the characteristics of large number of conductors, short distance between loops, and various operation modes, which makes its fault types and fault transient characteristics far more complex than single-circuit lines. Taking double-circuit lines on the same tower as an example, there are 98 types of cross-line faults, accounting for about 82% of all fault types. According to domestic and foreign operating experience, the probability of cross-lin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R31/02
Inventor 安然然盛超张哲尹项根何茂慧王奕胡玉岚唐萃隆茂张健李田刚张远罗勇翁洪杰张俊峰赵艳军朱良合王玲孙闻马明陈锐
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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