A cable fault location detection method
A detection method and cable fault technology, which is applied in the direction of fault location, fault detection according to conductor type, etc., can solve problems such as the impact of transient traveling wave velocity at the fault point, timing instability, etc., and achieve the goal of overcoming untimeliness and simple and convenient operation , high-precision effect
Active Publication Date: 2020-09-29
HANGZHOU DIANZI UNIV
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Problems solved by technology
Among the existing traveling wave ranging technologies, compared with the single-ended traveling wave ranging technology, the double-ended traveling wave ranging technology has higher reliability, so it is used as the main ranging technology in practical applications. This technique requires precise clock synchronization and power line parameters, where the power line parameters often have a huge impact on the transient traveling wave velocity generated at the fault point
At present, most of the double-terminal traveling wave ranging technologies use satellite technology to realize clock synchronization at both ends of the line. Using the synchronous clock output based on GPS or Beidou system, the clock synchronization accuracy of the devices at both ends can reach 1 μs, and the resulting ranging The error will not exceed 150m, but this technology has the disadvantage of timing instability
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[0024] The present invention will be further described below in conjunction with accompanying drawing.
[0025] like figure 1 and 2 As shown, a detection device used in a method for detecting a cable fault location includes two detection components. The detection component includes a grounding box 1, a data acquisition module 2, a current transformer 3, a capacitor 4, a clock module 6, a main control module 7, a communication module 8 and a background server 9. The data acquisition module 2 includes an A / D converter 10 , an FPGA high-speed acquisition module 11 and a switching value control unit 12 . The main control module 7 adopts a single-chip microcomputer. One end of the three capacitors 4 is respectively connected to the three live wires of the three-phase power line 5 , and the other end is respectively connected to a terminal of the primary winding in the three current transformers 3 . The other terminals of the primary windings in the three current transformers 3 ...
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The invention discloses a cable fault position detecting device and a fault position detecting method thereof. The single-end travelling wave fault location technology has low measurement accuracy inthe existing travelling wave fault location technology, and the double-end travelling wave fault location technology has the disadvantage of timing instability in the existing travelling wave fault location technology. The cable fault position detecting device of the invention comprises n detecting components, and n satisfies a formula n>=2. The n detecting components are spaced apart on three-phase power lines. The detecting components comprise grounding boxes, current transformers and capacitors. One end of each of the three capacitors is connected to one of three live lines of the three-phase power lines, and the other end of each of the three capacitors is connected to one terminal of a primary winding of the corresponding of the three current transformers. The other terminal of the primary winding in each of the three current transformers is connected to a ground line of one of the three-phase power lines. Two steps of clock synchronization detection and power line parameter detection do not exist, the propagation speed of a current traveling wave does not need to be known, operation is simple and convenient, and high precision also be possessed.
Description
technical field [0001] The invention belongs to the technical field of power line fault distance measurement, and in particular relates to a cable fault position detection method. Background technique [0002] In order to quickly locate the fault location in the transmission line of the power system, the traveling wave ranging technology has been widely used in the detection of the fault location of the power line due to its high accuracy and wide application range. Among the existing traveling wave ranging technologies, compared with the single-ended traveling wave ranging technology, the double-ended traveling wave ranging technology has higher reliability, so it is used as the main ranging technology in practical applications, but this This technique requires precise clock synchronization and power line parameters, where power line parameters often have a huge impact on the velocity of transient traveling waves generated at fault points. At present, most of the double-te...
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IPC IPC(8): G01R31/08
CPCG01R31/083G01R31/085
Inventor 许明章佳奇陈国金
Owner HANGZHOU DIANZI UNIV