Due to the fact that cable branch boxes are mostly distributed in urban green belts, the planned roads and industrial parks of the new city have been operating in humid, dirty, and high-temperature environments for a long time. Due to the installation process, the cable terminals in the branch box cable warehouse may experience short circuit faults due to wet grounding. Below is the significance of using electrical polymer moisture-proof sealing agents.
     The significance and background of the use of electrical polymer moisture-proof sealing agents
     1、 Faults that occur after the cable branch box is damp
     1. Short circuit explosion
After the cable branch box is damp, there may be a short circuit inside, severe flashover discharge of the metal frame, burning of the terminal stress cone, and melting of the cable core. In addition, if the grommet ruptures and the air chamber leaks, it is also possible to discard the branch box.
     2. Three phase short circuit
Moisture enters the interior of the branch box, silicone grease solidifies, water vapor enters the rope core, insulation strength is damaged, and surface discharge occurs. Short term intermittent grounding faults occur in the branch box, and long term rapid tripping occurs in the branch box, developing from intermittent grounding to three-phase short circuit.
     2、 Key factors for moisture-proof cable branch boxes
When moisture enters the cable branch box, a fault occurs at the cone tail. The device is located at the end of the cable semiconductor layer, and the electric field is concentrated. Moisture entering the branch box is prone to leakage and develops into a grounding short circuit.
     3、 Damp proof and sealing measures for cable branch boxes
Electrical polymer moisture-proof sealing agent is a new type of environmentally friendly moisture-proof sealing agent with moisture-proof and flame-retardant functions, specifically used for electrical equipment such as outdoor junction boxes, mechanism operation boxes, and cable branch boxes in substations. The electrical polymer moisture-proof sealing agent applies polymer mixing technology and adopts a highly active chemical formula. It has the characteristics of low viscosity, good fluidity, easy penetration, no deformation, no deterioration, and no cracking, forming sufficient sealing in the gaps at the bottom of electrical equipment; Enduring natural temperature freeze-thaw cycles and various harsh environments, effectively preventing small animals from entering the cold storage from underground, is an excellent solution for the safe operation and moisture-proof sealing of electrical equipment in the power grid.