Cable Equipment Live Detection Solution

Product Overview
As power cables become increasingly widespread in transmission and distribution systems, electrical faults caused by insulation damage in the cable itself and its accessories are also on the rise, severely impacting the reliability of power supply. Partial discharge phenomena within power cables are closely linked to the condition of cable insulation—its occurrence often signals potential defects that could jeopardize the safe operation of the cable. By monitoring the partial discharge levels in operating cables, it is possible to determine whether insulation defects exist and assess their severity. Based on these findings, maintenance can be scheduled appropriately, helping to prevent major accidents from occurring.

① Ultrasonic Testing: Non-contact ultrasonic sensors are used to detect surface discharge on cables, while contact-type ultrasonic sensors are suitable for identifying internal discharge at cable terminals and joints.
② Ultra-High Frequency Detection: Follow the test principle of "far first, then near," first checking for signals externally, and then applying the sensor to verify signal presence.
③ High-Frequency Current Detection: High-frequency current sensors are used to detect high-frequency pulse current signals flowing through the grounding down conductor or other ground potential connection lines, enabling the identification of cable defects.
④ Infrared Temperature Measurement: Offers advantages such as fast measurement speed, high accuracy, excellent sensitivity, and intuitive visualization. It can detect issues like moisture ingress or degradation in components such as cable bodies, terminals, intermediate joints, and grounding systems—caused by factors like construction quality or operational environment.
⑤ Sheath Grounding Current Detection: By monitoring the magnitude of the sheath grounding current, potential faults such as cable line failures or metal sheath exposure leading to short circuits in the metallic sheath can be promptly identified.

Detection Cycle

Detection Cases

Cable terminal floating discharge	Interphase air gap discharge in cables	Internal water ingress in the intermediate joint	Cable terminal shed shows abnormal temperature