Reasons for failure of switch cabinet

1. The air insulation gap is small: because some high-voltage switchgear manufacturers do not strictly implement the relevant technical standards of the switchgear, the air between the phase and the phase and the phase and the ground of the charged body in some 10kV high-voltage switchgear cabinets in operation The insulation gap is mostly between 100 and 125mm. As a pure air-insulated electrical equipment, the "Technical Regulations for the Design of High-Voltage Power Distribution Equipment" clearly stipulates that the Zui small gap for pure air insulation in a 10kV system is 125mm. From the results of the AC withstand voltage test and the accident analysis, it can be seen that the minimum air insulation gap between the phases and the phases and the ground of the charged body in the 10kV high voltage switchgear cabinet is less than 125mm, which is prone to accidents.

2. Poor insulation performance of matching accessories: In order to reduce costs, some manufacturers use matching accessories with lower insulation levels, which causes the pollution flashover voltage of the entire switchgear to decrease, which does not meet the rated standard requirements.

3. When using composite insulation, air gaps should not be ignored: some 10kV high voltage switch cabinets are equipped with partitions made of insulating materials. From the actual situation, when using this composite insulation, air gaps and air gaps cannot be ignored. The minimum is not less than 30mm, otherwise it is easy to cause insulation accidents.

4. Poor operating environment and low maintenance quality: Generally speaking, the operating environment of 10kV high-voltage switchgear is poor, and it is often attacked by dust, smoke, steam, etc., causing the surface of the insulation layer to be corroded, generating conductive objects and forming insulation defects . There are also individual switchgear users who do not pay attention to the overhaul and maintenance of the equipment, and fail to discover and eliminate various insulation defects in time, causing insulation accidents.

The switchgear should also be regularly maintained during use to ensure safe and effective work.