Thread Content
In switchgear with insufficient insulation distance, insulation-related problems are the most prominent among the defects and failures that occur during operation. The insulation distance between live parts inside the cabinet or between them and the ground is insufficient. It is often less than the insulation clearance requirements specified in the Unified Opinions on the Differences in Technical Standards for Power Grid Equipment. At the same time, the insulating rod in the switchgear, which is used to support the insulating plate, comes close to or into contact with the conductor, with a distance of less than 60 mm; discharge phenomena between the insulating rod and the conductor are severe. Solution: The operating unit must conduct acceptance checks in strict accordance with the standards ； Manufacturers improve production processes ； The operating unit carries out live partial discharge detection. No chamfering or polishing has been carried out on areas where the electric field strength is relatively high, such as the inlet and outlet bushings, mechanical valves, and bends in the busbars; such measures should be taken to prevent electric field distortion. Solution: During operation, enhance live detection efforts through methods such as partial discharge and infrared thermography to identify potential hazards at an early stage. The operating environment is harsh; in some switchgear cabinets, the internal environment is particularly adverse. This may be due to improper installation locations of the switchgear or the lack of effective heating and dehumidification equipment inside the cabinets, resulting in surface discharge, condensation, etc., within them. Solutions: The cabinets should be equipped with reliable dehumidification devices. Operating units must strengthen the comprehensive improvement of the environment surrounding the switchgear. During operation, partial discharge live detection should be carried out. The overheating issues in switchgear are primarily caused by factors such as an unreasonable cabinet structure, poor ventilation design, defects in the main circuit connections, and use of substandard materials for components. Solution: Install online temperature monitoring systems on high-risk heat-generating components such as switchgear contacts, busbars, and cable joints. Currently, Junhe has developed and implemented a new wireless temperature measurement technology, which effectively addresses issues related to the difficulty of temperature measurement in switchgear, limited space constraints, and electromagnetic interference.