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

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 ...

AI Technical Summary

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

Images