The high-voltage switchgear can only take on the responsibility if it is strong and complete. During the transportation process, the switchgear is damaged or the attachment is lost due to the lack of packaging and the protection measures are not comprehensive. During the installation and commissioning, the construction personnel do not follow the construction requirements. Conducted, brutal construction, causing damage to the switchgear. If the problem is not discovered in time when the equipment is unpacked or inspected, the special situation such as high load or short circuit fault will occur after the substation is put into operation, which will cause hidden dangers.
Solution: When the switchgear is unpacked, it must be strictly and carefully, and should not be negligent. Any details should be taken seriously. Check the switchgear in detail according to the invoice to ensure that no component equipment is lost. In the actual installation and commissioning process, through the use of appropriate tools for transshipment installation, in the event of problems, look for reasons, ideas, and no barbaric construction.
2. Analysis of the causes of cable dampness and insulation reduction and countermeasures
The connection between the switchgear and the transformer and the system is mainly through the high-voltage cable. The connection part needs to use the cable head. For the cable joint of the high-voltage equipment, the power industry has strict technical requirements. In actual work, if the cable cut is not done well. Sealing measures, if exposed to the air for a long time, will lead to moisture intrusion, resulting in reduced cable insulation; if the cable head construction process is poor, local heating is likely to occur during actual operation, which is a serious hidden danger for the safe operation of the substation. After the high-voltage cable is connected with the switchgear, it leads to the other parts of the substation through the cable channel. If the perforation of the switchgear cabinet is not tightly sealed, the intrusion of moisture or debris in the cable trench may occur, reducing the insulation or causing a short-circuit accident.
Solution: Cable head quality is more important in long-term operation. In the actual construction process, the cable cuts should be strictly sealed. When the cable head is pressed, the speed is fast and the installation and fastening are qualified. The cable perforation should be tightly sealed, and the cable channel should be waterproof and ventilated to ensure the drying and cleaning of the cable trench.
Mid-Range Frequency Loudspeaker
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