Important high-voltage loading and unloading equipment in ports such as ore and coal loaders, ship loaders, ship unloaders, bucket wheel machines and other power supply cable reeling drums contain conductive slip rings. If the high-voltage conductive slip ring is broken down due to insulation problems, it will lead to the failure of the whole machine power supply, unable to produce normally, or even damage the whole machine.
1. Port terminal long-term high temperature and high humidity environment, cable reeling drum conductive slip ring often fails due to the following two reasons.
(1) Humid air.
High-voltage equipment has high requirements for insulation performance, large terminals of high-voltage cable slip ring is usually installed outdoors, the shell is usually not insulated metal, when the shell temperature is lower than the dew point temperature in the environment, under the action of high humidity, the lower temperature surface will produce liquid water, combined with the dust on the surface of the object to form a conductive channel to destroy the electrical insulation, the previous non-conductive area into a conductive area. Although the cable inlet, outlet and box cover are sealed, it is impossible for the reducer to be completely sealed at the connection of the box.
(2) The temperature difference between day and night is large.
The port has a large temperature difference between day and night, the surface of the slip ring is warmed by light during the day and the temperature drops sharply at night. Hot moisture condenses into water droplets under the action of the cold surface, and the condensate may drip down to the internal lines or components by gravity. When the condensate accumulates for a long time, it will lead to internal water conductivity and current string circuit causing breakdown.
2,.for the above problems, we have made a relative study for this and come up with a solution.
(1) Install heat insulation protection device above the cable reeling drum.
In the airtight, waterproof and dustproof cable reeling drum has met the requirements. The purpose of adding heat insulation protection device is to avoid direct sunlight to make the box warm up too much in the daytime, and can effectively prevent the formation of condensation at night.
(2) The interior of the high-voltage slip ring box is equipped with a heating dehumidifier.
Heating dehumidifier plays an active role in preventing moisture, preventing condensation and ensuring reliable operation of high-voltage equipment.
cable reeling drum conductive slip ring has the advantages of good electrical conductivity, corrosion resistance and high mechanical strength. In synchronous motors and special high-voltage power supply equipment, steel collector rings are used to improve wear resistance and stability.
The above is the analysis of the causes of cable reeling drum conductive slip ring failure and solutions. If you need more detailed information, welcome to contact us!