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System and method for monitoring leakage current and dielectric loss in cable in real time

A leakage current, real-time monitoring technology, applied in the direction of measuring resistance/reactance/impedance, measuring electrical variables, measuring devices, etc., can solve problems such as difficult normal operation, damaged insulation performance, high cost, etc., to ensure safe and reliable operation and avoid measurement effect of error

Pending Publication Date: 2021-08-24
陈勇
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] During the use of the cable, due to the influence of multiple factors such as the thermal effect generated by the electric field, mechanical stress, chemical corrosion and environmental conditions, the insulation quality of the cable gradually declines. In severe cases, the insulation performance is damaged, leakage, discharge, etc. occur, and the insulation performance is reduced Damaged cables are dangerous to use and difficult to function properly
[0004] At present, in order to improve the safety and reliability of cable operation, the insulation preventive test is usually carried out on the cable regularly, that is, the high voltage test is carried out on the cable under the condition of power failure. This test has the following limitations: a. However, a power outage will not only affect the power users, but also damage the power system, which is a phenomenon that the power system tries to avoid; b. The preventive test requires high-voltage tests on all cables, and high-voltage tests on cables will Accelerate the aging of cable insulation and shorten the service life of cables; c. Maintenance requires a large number of professionals to complete, and the cost is high
[0006] The dielectric loss can not only reflect the overall aging of the cable insulation, but also serve as an important parameter for monitoring the cable insulation state. At present, the offline method is mainly used to measure the cable dielectric loss: including using the charging current generated after the DC voltage is applied to the solid insulating medium to derive the dielectric loss. , Use the improved Xilin bridge method to measure the dielectric loss angle or use the known capacitance with negligible loss angle as the reference capacitance, but the offline measurement accuracy is high, but the power failure, disassembly and installation will increase the operation and maintenance cost

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  • System and method for monitoring leakage current and dielectric loss in cable in real time
  • System and method for monitoring leakage current and dielectric loss in cable in real time
  • System and method for monitoring leakage current and dielectric loss in cable in real time

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Embodiment Construction

[0059] Embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0060] When carrying out voltage transmission, usually by three-phase cables (A, B, C), each cable includes a core body 1, and the outside of the core body 1 is covered with a cable sheath 2, and the cable sheath 2 has electrical conductivity.

[0061] Due to different application occasions, the cable length and grounding method are different: a. For short cable lines with low utilization hours, large margins, small loads, and a length of less than 100 meters, one end of the cable sheath 2 is connected to the ground protector through a grounding switch The other end is directly grounded; b. When the cable length is 100-500m and the induced voltage value is within the safety limit (≤50V), one end of the cable sheath 2 is grounded directly through the grounding protector, and the other end is grounded directly. One end is directly grounded; c. Wh...

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Abstract

The invention discloses a system and a method for monitoring leakage current and dielectric loss in a cable in real time, and relates to the technical field of cable monitoring, the cable is provided with a cable sheath and joints, the number of the joints is greater than or equal to 0 and is an integer, and when the joints are zero, one end of the cable sheath is grounded through a grounding switch, and the other end of the cable sheath is grounded through a current sensor; when the connector on the cable sheath is 1, the two ends of the cable sheath are grounded, and the connector is grounded after passing through a current sensor; and when the joint on the cable sheath is greater than 1, one end of the cable sheath is grounded through the grounding switch, the other end of the cable sheath is grounded through the current sensor, and all joints are grounded through the current sensor. The leakage current in the cable can be monitored in real time, the dielectric loss is calculated, the cost is low, and power failure can be avoided.

Description

technical field [0001] The invention relates to the technical field of cable monitoring, in particular to a system and method for real-time monitoring of leakage current and dielectric loss in cables. Background technique [0002] XLPE (Cross-linked Polyethylene, cross-linked polyethylene) cables are widely used in transmission lines and distribution networks of power systems due to their advantages of high dielectric strength, small dielectric loss coefficient, easy laying, and simple operation and maintenance. The mainstream of cable development. [0003] During the use of the cable, due to the influence of multiple factors such as the thermal effect generated by the electric field, mechanical stress, chemical corrosion and environmental conditions, the insulation quality of the cable gradually declines. In severe cases, the insulation performance is damaged, leakage, discharge, etc. occur, and the insulation performance is reduced Damaged cables are dangerous to use and ...

Claims

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Application Information

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IPC IPC(8): G01R31/52G01R27/26
CPCG01R31/52G01R27/2694
Inventor 陈勇黄文雄郝乾王永君黄兴明熊志云袁攀张磊吴俊程子阳
Owner 陈勇
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