For the first time, the Kunming Power Supply Bureau applied cable detection technology on 35 kV medium-voltage cable lines

On the morning of March 2, Kunming Power Supply Bureau applied cable detection technology on 35 kV medium voltage cable lines for the first time to carry out the partial discharge test
of oscillating waves on cable lines.
Through this technology, the staff can grasp the operation status of the cable in advance, eliminate hidden dangers in time, avoid temporary failures, and fundamentally improve the reliability of
power supply.

It is understood that on the medium voltage cable line with a voltage level of 35 kV and below, the oscillation wave partial discharge test is a relatively mature cable partial discharge offline detection technology, through the analysis and calculation of the pulse signal in the cable discharge current flowing through the system detection loop after charging, the detection and position determination of the internal partial discharge value of the cable is realized
.

At present, Kunming Power Supply Bureau has 37 35 kV cable lines, with a total length of 41.
647 kilometers, and it is necessary
to use advanced detection methods to diagnose the operating status of cable lines.
Through the application and promotion of this technology, we can scientifically grasp the operation status of the cable route, discover potential safety hazards in advance, avoid the failure of the cable body, reduce the accident rate, and bring economic benefits
.

The Kunming Power Supply Bureau attaches great importance to the monitoring
of cable health.
In order to grasp the health status of cable routes, in January 2014, Kunming Power Supply Bureau carried out the first 10 kV cable oscillation wave partial discharge test test, and normalized the application of this technology
.
In 2016, Kunming Power Supply Bureau continued to introduce new equipment and technology to achieve pulse consultation
on the health status of 35 kV cables.

It is reported that the Kunming Power Supply Bureau chose to apply cable detection technology on a 35 kV cable on the main network transmission line, and will gradually promote the application in the future to detect
the condition of new cables and faulty repair and replacement equipment.
In addition, before the peak summer of the power grid, the Test Research Institute of Kunming Power Supply Bureau is stepping up preventive tests and new technology pilots to ensure the safe and reliable operation
of the power grid during the peak summer period.