Check and maintenance precautions for the isolating switch
When the isolating switch is damaged, it needs to be repaired, or when it is repaired during regular maintenance, the dust on the bottom plate should be removed to ensure good insulation. Check the contact condition of the contact knife. If the contact knife is seriously worn or the arc contact is burned by the arc transition, it should be replaced in time. It is found that the rotating knife of the contact knife is too loose. If it is bolted, the bolt should be tightened.
When installing the isolating switch, it should be noted that when the busbar is connected to the isolating switch terminal, there is no great torsional stress and the contact is reliable. When installing the lever operating mechanism, the length of the connecting rod should be adjusted to ensure that the operation is in place and flexible. The arc extinguishing chamber must be secured after installation.
(1) Fuse-type isolating switches, for example, the trough-shaped rails of the HR17B series must always be kept clean to prevent inflexible operation after fouling.
(2) Always check the contacts of the isolating switch to remove dust and oil. The friction of the operating mechanism should be regularly lubricated to make it flexible and prolong the service life.
(3) When replacing the fuse link, the operator should wear work gloves to avoid hot hands due to the high temperature of the fuse tube.
(4) When replacing the fuse-link, care should be taken to replace the fuses of the same type and specifications.
(5) Try to avoid unnecessary disassembly and assembly of the arc extinguishing chamber. After removing it, be sure to install it carefully to avoid accidents.
(6) When reinstalling, the oxide film must be removed at the connection between the bus bar and the socket, and then immediately coated with a small amount of industrial petrolatum or conductive paste to prevent oxidation.
(7) When repairing the load switch, pay attention to keep the handle and the door interlocked, and do not remove it easily. Operation check items for low voltage disconnectors:
(8) Check if the load current exceeds the rating of the isolating switch.
(9) Check the connection between the contact and the isolating switch for overheating.
(10) Check the insulation connecting rod and the base for damage and discharge.
(11) Check the contact for burns and whether the arc extinguishing cover is clean and complete.
(12) Check if the contact of the contact is tight, whether the three phases are in contact at the same time, and whether the lead wire nut is tight.
(13) The operating mechanism should be in good condition, the action should be flexible, the position of branching and closing should be in place, and the top wire, pin and tie rod should be normal.
(14) For the HR3 type fuse type knife switch, pay special attention to adjusting the center position between the upper and lower contacts and the upper and lower contacts in the same phase to make the contact tight.
(15) Check if the controlled load is within the rated capacity, and whether the melt is matched with the load.Shenzhen Xcool Vapor Technology Co.,Ltd , https://www.szxcoolvapor.com