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Distribution network line homonymous phase two-point successive ground fault line selection method

A technology of ground fault and line selection method, which is applied to the fault location, detects faults according to conductor types, and measures electricity. The effect of safe operation and improvement of work efficiency

Active Publication Date: 2017-08-22
ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD +1
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Problems solved by technology

If such a fault occurs, it can only be checked manually, which takes a long time and is inefficient, affecting the electricity consumption of residents and factories, and it is easy to cause equipment insulation breakdown damage and electric shock casualties during the fault period

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  • Distribution network line homonymous phase two-point successive ground fault line selection method
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  • Distribution network line homonymous phase two-point successive ground fault line selection method

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Embodiment Construction

[0038] In order to better understand the present invention, the present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

[0039] Such as figure 1 and figure 2 As shown in the present invention, a method for line selection of a distribution network line with the same name as the two-point successive grounding fault line comprises the following steps:

[0040] (1) Real-time data collection: collect the zero-sequence voltage of the busbar and the zero-sequence current of each line; the real-time sampling rate is not lower than 25.6kHz, so as to ensure the undistorted capture of the zero-sequence current transient signal at the moment of grounding;

[0041] (2) Fault start discrimination: real-time detection of zero-sequence voltage mutation or zero-sequence voltage. The criterion for fault startup is: detecting whether the zero-sequence voltage mutation has reached the threshold of the zero-sequence voltage mutation or...

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Abstract

The invention relates to the technical field of power system distribution network single-phase ground fault detection, in particular to a distribution network line homonymous phase two-point successive ground fault line selection method. The distribution network line homonymous phase two-point successive ground fault line selection method comprises the specific steps of (1) real-time data acquisition, (2) fault starting discrimination, (3) characteristic component extraction, (4) characteristic component analytical processing, (5) single-point grounding discrimination, and (6) two-point grounding discrimination. After fault starting, zero-sequence current characteristic components of each line are extracted and analyzed, the characteristic component amplitude values are sorted by magnitude, and phase relations between the characteristic components of the lines at characteristic frequency are compared to find a grounding line. The distribution network line homonymous phase two-point successive ground fault line selection method effectively solves the distribution network line homonymous phase two-point ground fault line selection difficulty, is conductive to improving operation efficiency, reduces the power failure range, ensures the safe operation of the distribution network system and reduces personal injury and death.

Description

technical field [0001] The invention relates to the technical field of single-phase grounding fault detection in a distribution network of a power system, in particular to a line selection method for two-point successive grounding faults of the same-named phase of a distribution network line. Background technique [0002] A considerable part of my country's low-voltage distribution network adopts the neutral point ungrounded method. After a single-phase ground fault occurs in this type of network, since no short-circuit current is generated and the line voltage is symmetrical, it can still supply power to the load normally, and there is no need to immediately Cut off the power supply line with single-phase grounding, and allow it to continue running for 1 to 2 hours according to the requirements of the regulations. However, after a single-phase grounding occurs, the ground-to-ground voltage of the non-faulty phase rises to the line voltage, which brings hidden dangers and thr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/085G01R31/088
Inventor 高立克何满欧阳健娜秦丽文俞小勇况成忠左小阳周杨珺齐鹏辉李克文梁朔欧世锋李珊陈绍南祝文姬
Owner ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD
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