A system and method for inspecting single-phase grounding fault points of distribution lines
A single-phase ground fault and power distribution line technology, applied in the direction of fault location, etc., can solve the problems of no intelligent fault location strategy, time-consuming and labor-intensive shaking of the meter, and poor anti-interference performance, so as to shorten the time of inspection and maintenance, The effect of simple operation and simple structure
Active Publication Date: 2017-10-31
STATE GRID CORP OF CHINA +2
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Problems solved by technology
[0004] The purpose of the present invention is to solve the above problems and provide a system and method for inspection of single-phase ground fault points of distribution lines. The application of open CT with an unclosed magnetic circuit results in poor measurement accuracy, poor anti-interference performance, and no intelligent fault location strategy, so inspection personnel can only judge fault location based on a large number of on-site measurement data combined with experience question
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[0034] In order to further understand the features, technical means, and specific goals and functions of the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.
[0035] see figure 1 , the present invention includes a signal source 6 for outputting the S injection signal, a high-voltage clamp meter 3 hooked on the load wire under test, and three S signal injection hooking rods 2, three S The signal injection is connected so that the gram bar 2 is short-circuited through two three-phase short-circuit wires 1; such as Figure 2-1 and Figure 2-2 As shown, the panel of the signal source 6 is provided with a power switch 11 and a button 12 for controlling the injection of the S signal on and off. One end of the S injection signal line 4 is connected to the signal output end of the signal source 6, and the other end is connected to an S signal injection hook 2; the ground end of the...
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The invention discloses a patrol inspection system and method for single-phase-to-earth fault points of a power distribution line. S signals are injected in a three-phase line through a signal source, the S signals are detected by a high-voltage tong type ammeter, actual S detection signals are obtained by the calculation of the terminal of a PDA (Personal Digital Assistant), and fault points are further correctly positioned; because the distributed capacitance of the three-phase line is basically balanced, the patrol inspection system and method disclosed by the invention greatly avoids the influence of distributed capacitance of the line on the injected S signals, overcomes the defects of tramegger line detection and visual inspection of lines by persons climbing poles step by step, and effectively deals with failures, such as high-resistance grounding of long lines. The patrol inspection system disclosed by the invention is convenient to operate and simple in structure, the requirements for the patrol inspection experiences of patrol inspection staff are low, and the time for patrol inspection and maintenance is shortened.
Description
technical field [0001] The invention belongs to the technical field of power distribution fault inspection equipment, relates to a fault point inspection method, and in particular relates to a single-phase grounding fault point inspection system and method of a power distribution line. Background technique [0002] In my country's 6kV, 10kV and 35kV power supply and distribution networks, the single-phase grounding fault is the most common line fault in the distribution network, especially in the 10kV distribution network. And quite a lot of ground faults (especially invisible ground faults (ie: soft grounding): such as porcelain bottle breakdown, transformer internal grounding, arrester breakdown, transformer grounding, gram insulator breakdown, etc.), the staff often need to It can take hours, even dozens of hours, to find the ground fault point. As the power transmission cannot be restored for a long time, it not only has a great social impact, but also reduces the elect...
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IPC IPC(8): G01R31/08
Inventor 刘宏森张战汉薛军周艺环李迎华陈磊牛全保魏奉林王建辉唐敏涛张利阳
Owner STATE GRID CORP OF CHINA