A Fault Monitoring Method for High-Voltage Power Cable Joints Based on Deformation Measurement
A cable joint and high-voltage power technology, which is applied in the field of high-voltage power cable joint fault monitoring based on deformation measurement, can solve problems such as cable joint eccentricity, local field strength, insulation breakdown, and influence on daily life, and achieve the effect of eliminating hidden troubles
Active Publication Date: 2019-07-12
STATE GRID CHONGQING ELECTRIC POWER CO ELECTRIC POWER RES INST +2
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Problems solved by technology
Once a cable accident occurs, not only will a large number of power cables be damaged, but it will also cause power outages in some factories and enterprises and a large number of residents cannot get normal power supply, which seriously affects people's daily life and brings huge losses to the country and the people.
When a power cable fails, a large part of the reason is that the cable joint is eccentric due to poor construction technology or because there is an air gap in the laying of the material at the cable joint, which causes the local field strength at the cable joint to be too large, and partial discharge occurs. , long-term operation will cause damage to the insulation of the cable joints, causing insulation breakdown and affecting the normal power supply
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[0027] The present invention will be further described below in conjunction with drawings and embodiments.
[0028] As shown in the figure, a deformation measurement-based high-voltage power cable joint fault monitoring method provided by this embodiment includes the following steps:
[0029] An annular array strain gauge composed of resistance strain gauges is arranged on the surface of the cable joint;
[0030] Use the ring array strain gauge to collect real-time signal of the cable joint;
[0031] Input the real-time signal into the data preprocessing unit for data preprocessing;
[0032] The microcontroller collects the preprocessing signal and calculates the running state of the cable joint; outputs the running state signal of the cable joint.
[0033] The data preprocessing includes the following steps:
[0034] The current signal on the resistance strain gauge is obtained; the current signal is converted into a voltage signal through a transimpedance amplifier, and t...
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The invention discloses a high-voltage power cable joint internal overheating fault monitoring method based on deformation measurement. The method is based on the fact that under the condition that a power cable joint is eccentric or the insulating material in a local position ages, the field intensity in the local position of the cable joint is large, and the cable joint is prone to partial discharge. The energy in the local position is converted from electric energy to internal energy, and cross-linked polyethylene on the surface of the cable joint deforms because of heat. According to the method, a resistance strain gauge array arranged around the surface of a cable joint measures the change in deformation of the surface of the cable joint, the resistance change of the resistance strain gauges is converted into a voltage change signal, the signal enters a microcontroller after being amplified and filtered, the microcontroller analyzes the strain distribution on the surface of the cable joint according to the detected signal, a display displays the strain in all directions of the cable joint in real time, and the running status of the cable joint under the condition that the cable joint is eccentric or the insulating material in a local position ages is acquired.
Description
technical field [0001] The invention relates to the field of thermal fault monitoring of high-voltage power cable joints, in particular to a deformation measurement-based high-voltage power cable joint fault monitoring method. Background technique [0002] At present, it has become an inevitable trend in the development of urban power grids to replace the original overhead line power supply with cable power network power supply. With the widespread use of power cables, incidents of power cable failures are frequently reported. Once a cable accident occurs, not only will a large number of power cables be damaged, but it will also cause power outages in some factories and enterprises and a large number of residents cannot get normal power supply, which seriously affects people's daily life and brings huge losses to the country and the people. . When a power cable fails, a large part of the reason is that the cable joint is eccentric due to poor construction technology or bec...
Claims
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IPC IPC(8): G01R31/02G01L1/22
CPCG01L1/22G01R31/58
Inventor陈伟何国军杨帆吴高林胡晓锐杨旗李勇籍勇亮
OwnerSTATE GRID CHONGQING ELECTRIC POWER CO ELECTRIC POWER RES INST