1. Rust of the mechanism
The transmission mechanism of the switch cabinet in the long-term wet operation environment often encounters deformation, bending, connecting rod breaking, crank arm breaking, transmission pin breaking, etc., resulting in difficult operation and heavy operation. Some connecting rods have small rigidity, serious corrosion, and severe mechanical vibration during operation. It is easy to cause the switch cabinet to be divided and rejected. The operating mechanism is stuck, the fuse connecting rod is broken and the interphase short circuit trips, or the single-phase grounding seriously affects the reliable operation of the switch cabinet.
2. Creepage
After using for a certain period of time, the surface of the insulating part is often attached with dirt, which reduces the insulation strength of the insulating part, and causes the insulating material to be charged in the humid air.
1. Rust of the mechanism
The transmission mechanism of the switch cabinet in the long-term wet operation environment often encounters deformation, bending, connecting rod breaking, crank arm breaking, transmission pin breaking, etc., resulting in difficult operation and heavy operation. Some connecting rods have small rigidity, serious corrosion, and severe mechanical vibration during operation. It is easy to cause the switch cabinet to be divided and rejected. The operating mechanism is stuck, the fuse connecting rod is broken and the interphase short circuit trips, or the single-phase grounding seriously affects the reliable operation of the switch cabinet.
2. Creepage
After a certain period of time, the surface of the insulating part is often attached with dirt, which reduces the insulation strength of the insulating part, causing the insulating material to be charged in the humid air, resulting in insulation damage, phase short circuit and other faults.
3. Partial discharge
In a solid dielectric with a gas or liquid, when the local field strength of the gas or liquid of the breakdown field strength reaches its breakdown field strength, this part of the gas or liquid starts to discharge. Partial discharge is generally caused by the special concentration of local electric field inside the insulator or on the insulating surface.
The humid air in the cabinet will cause condensation on the surface of the internal parts of the high-voltage switchgear, resulting in a significant reduction in the initial discharge voltage and flashover voltage of the parts, and a significant increase in discharge. Each partial discharge will have some effect on the insulation medium, slight partial discharge has little effect on the insulation of power equipment, and the insulation strength decreases slowly: while strong partial discharge will make the insulation strength drop quickly. This is an important factor in the insulation damage of high voltage power equipment.
These problems of partial discharge, creepage and corrosion of high voltage switch cabinet caused by humidity can be solved by installing dehumidifier of switch cabinet.
