It is important to look for the reasons for the dampness of the terminal box and take measures to prevent the occurrence of the accident. Substation terminal box appears to be a simple ancillary equipment, its management and maintenance is often easy to be ignored, but the current situation is part of the substation a considerable part of the terminal box terminal block rust is very serious, seriously affecting the safe operation of equipment. Therefore, to strengthen the terminal box selection, construction process management and operation and maintenance is very necessary. To prevent the terminal box damp the specific measures are the following: substation switch terminal box design, selection, should be fully considered outdoor terminal box moisture, rain and high temperature, low temperature capacity, reasonable consideration of maintenance, operation Convenience. Using the switch terminal box and the cable groove is completely separate from the installation design. In the switch box on both sides of the box with a dedicated ventilation holes, can form a convective wind, play a cooling effect, to ensure that the internal components of the box dry, but pay attention to take rain, anti-small animals and other measures.
Substation terminal box is the outdoor electrical equipment and indoor monitoring and control, protection, communications and other equipment connected to the middle part of the general installed in the side of the device. In the humid air, especially in the rainy season, outdoor switch terminal box moisture condensation of water, easily lead to DC secondary circuit to the insulation resistance decreased, severe insulation resistance dropped to zero, resulting in DC positive or negative power supply Grounded. If the DC two-point grounding, causing DC fuse blows, to protect the refusal or malfunction, or even damage the equipment, a serious threat to the safe operation of the grid. Terminal block box damp the terminal block screws and connectors rust, so that the secondary terminal contact is bad, also will make the current loop terminal heat or even open, resulting in protection refused to move or malfunction, causing accidents. Transformer voltage and switch, the temperature signal terminal contact failure will cause measurement and control, protection device abnormal operation, mistakenly signal, resulting in erroneous analysis of the operator to make mistakes.
In the switch terminal box to install anti-condensation dehumidification heating controller, built-in manual and automatic anti-condensation dehumidification heating device, in the wet environment or frost, condensation season use, to prevent frost, condensation caused by insulation drop and short circuit malfunction. In the switch terminal box placed in the amount of dehumidification items, such as silica gel, and regular inspection, timely replacement. For the equipment transformation or new installation of the terminal box, it is recommended to use chrome anti-rust terminals, the terminal block with horizontal arrangement. The development of switch terminal moisture maintenance management system, the responsibility to the people, regularly check the terminal box of the drive tide, heating device is normal, once the problem should be timely maintenance.