Cable fault detection system and fault positioning method thereof
A technology for cable fault and detection system, applied in fault location, fault detection according to conductor type, measurement device, etc., can solve problems such as high cost and complex structure, and achieve the effect of reducing system cost and simplifying system structure
Pending Publication Date: 2022-01-04
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology
However, the current online solution needs to install sensors and clock synchronization units at both ends of the monitored cable, which has a complex structure and high cost
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[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0028] The purpose of the present invention is to provide a cable fault detection system and its fault location method, which can realize online fault location without a clock synchronization unit and only install a monitoring device at one end of the cable. It has the characteristics of timely response, simple structure and low cost.
[0029] In order to make the above objects, features and advantages of the present invention more comprehensible, the present i...
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The invention discloses a cable fault detection system and a fault positioning method thereof. The system comprises a transformer T1, a transformer T2, a detected cable connecting the transformer T1 and the transformer T2 and a monitoring device installed at one end of the detected cable, the detected cable is provided with a connector b, the side, close to the detected cable, of the transformer T1 is connected with a first cable, and the first cable is provided with a connector a, the side, close to the detected cable, of the transformer T2 is connected with a second cable, the second cable is provided with a connector c, the monitoring device comprises a signal injection unit, a signal detection unit and a control unit, the signal injection unit and the signal detection unit are electrically connected with the control unit, and a voltage traveling wave detection module and a current traveling wave detection module are arranged in the signal detection unit. According to the cable fault detection system and the fault positioning method thereof, a clock synchronization unit is not needed, online fault positioning can be achieved only by installing the monitoring device at one end of the cable, and the cable fault detection system and the fault positioning method have the advantages of being timely in response, simple in structure and low in cost.
Description
technical field [0001] The invention relates to the technical field of cable detection, in particular to a cable fault detection system and a fault location method thereof. Background technique [0002] Distribution cables refer to cables with a voltage level of 10kV / 35kV, which have a large number and heavy maintenance workload. The rapid and accurate location of cable faults is one of the key technologies to improve the efficiency of cable operation and maintenance. The current cable fault location technologies mainly include impedance method and traveling wave method, among which the traveling wave method is widely used because of its high positioning accuracy. There are two main types of fault location using the traveling wave method: one is the offline method, which needs to disconnect the cable from the power grid after a fault, and conduct measurements without electricity, such as the low-voltage pulse method; the other is the online method, which will The monitoring...
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IPC IPC(8): G01R31/08G01R19/00
CPCG01R31/086G01R19/00Y04S10/52
Inventor 李岩
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)