Monitoring system for harmonic wave transaction of power distribution cable and early warning method
A technology of power distribution cables and monitoring systems, applied in the field of monitoring systems for harmonic changes in power distribution cables, can solve the loss of power failure during repair time, the lack of real-time online monitoring means and methods for power distribution cables, the operation management of power cables, and the detection and maintenance work. To reduce the power outage loss
Pending Publication Date: 2022-01-04
STATE GRID XINJIANG ELECTRIC POWER COMPANY HAMI POWER SUPPLY +1
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Problems solved by technology
Since power cables have thick insulating layers and are mostly buried underground, once a fault occurs, it is very difficult to find it, and often requires a lot of manpower and material resources. If the repair time is too long, it will cause additional power outage losses, which will bring damage to the power cables. Increase in the workload of power cable operation management, inspection and maintenance
[0004] The current monitoring system is mainly aimed at 110kV and above single-core transmission cables, while medium and low voltage distribution cables currently lack effective real-time on-line monitoring means and methods
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[0038] Such as image 3 As shown, a monitoring system for distribution cable harmonic fluctuations includes a high-precision current transformer, a distributed monitoring device for distribution cables, and a background analysis server; the distributed monitoring device for distribution cables includes an analog sensor conditioning module , a high-frequency sampling module, a communication module, a core processing unit, a power supply module and a shell; the output end of the high-precision current transformer is connected to the input end of the analog sensor conditioning module; the output of the analog sensor conditioning module terminal is connected with the input end of the high-frequency sampling module; the output end of the high-frequency sampling module is connected with the input end of the core processing unit; the core processing unit communicates with the communication module and the background analysis server; the core processing unit is integrated A microproces...
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The invention relates to a monitoring system for harmonic wave transaction of a power distribution cable. The monitoring system comprises a high-precision current transformer, a power distribution cable distributed monitoring device and a background analysis server, wherein the power distribution cable distributed monitoring device comprises an analog quantity sensing and conditioning module; the high-precision current transformer is connected to the analog quantity sensing and conditioning module; the analog quantity sensing and conditioning module is connected with a high-frequency sampling module; the high-frequency sampling module is connected with a core processing unit; and the core processing unit communicates with the background analysis server through a communication module. The invention further discloses an early warning method of the monitoring system for harmonic wave transaction of the power distribution cable. Harmonic signals formed by the cable line insulation defect discharge phenomenon are collected, the electrical quantity harmonic characteristics of the distribution cable are captured and analyzed, and the state of the cable is evaluated and early warned by comparing typical data recorded before or historically of the line. Therefore, a latent fault can be found early, and power failure loss caused by the fault is reduced.
Description
technical field [0001] The invention relates to the technical field of distribution cable operation status monitoring, in particular to a monitoring system and an early warning method for distribution cable harmonic fluctuations. Background technique [0002] With the acceleration of my country's urbanization process, the coverage and asset scale of power cables are increasing at an unprecedented rate. In order to meet the power supply demand, the proportion of power cables in the urban power grid is increasing. Although the operating reliability of power cables is higher than that of overhead lines, due to the influence of various factors, power cables will also fail during operation. For example, in power plants and substations, cable trays, cable tunnels, cable interlayers, cable trenches, cable shafts, switchgears, transformers, resistors and other power equipment are aging in high-voltage heating and causing fires. After years of fire investigation and research, it is ...
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CPCG01R23/16
Inventor 张琪宋立伟李龙蒋琪杨旭童丽萍刘骥朱俊羿王泽琦宋佩全王洋李朋曹效科
Owner STATE GRID XINJIANG ELECTRIC POWER COMPANY HAMI POWER SUPPLY