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Date：06-15-2022
The load switch on the column has the capacity of carrying and breaking the rated current, but cannot break the short-circuit current. It is mainly used for line segmentation and fault isolation.
(1) Gas-producing load switch. The gas-generating load switch is to use the slit composed of solid gas-generating material to generate a large amount of gas under the action of the arc to form a gas blowing arc. Because of its simple structure and low cost, it was once widely used.
(2) Vacuum, SF6 load switch. Similar in appearance and parameters to vacuum and SF6 circuit breakers, the difference is that the load switch is not equipped with protection CT and cannot break short-circuit current, but can withstand short-circuit current and close short-circuit current, with long life, maintenance-free characteristics, mechanical life, rated current open The number of interruptions is more than 10,000 times, which is suitable for frequent operations.
(3) Tips for use:
①From the point of view of use, the failure rate of the gas-producing load switch is relatively high, the arc extinguishing cover has fallen off, and the one-pole switch has been burned many times. Carbonized breakdown of epoxy resin insulators.
②The gas-producing load switch will sometimes produce arc light leakage when the power is closed, which will affect personal safety. According to the manufacturer’s introduction, the arc extinguishing process of the switch design mainly considers the live sub-load. When the main and auxiliary contacts are not synchronized when the switch is closed, it is easy to Arc flash leakage occurs.
③The arc extinguishing cover of the gas-producing load switch needs to be maintained irregularly. It needs to be checked and maintained for about 20 times of breaking the full load. It is not as good as the vacuum type and SF6 switch, which can be broken more than 10,000 times, and the long-term operation and maintenance workload is large.
④The operating mechanism of the gas-producing load switch can be divided into a hook type and a pull-down operation lever type. The pull-down operation lever type should be locked when installing the operating handle, and the lock body needs to be replaced and maintained from time to time, which is inconvenient to operate. The operating rod should be installed more than 2.5M above the ground, otherwise it will be easily damaged by external force.
⑤The current price of vacuum load combination switch is comparable to that of gas-producing switch, and its reliability and safety are unmatched by gas-producing load switch, so it should be preferably used when selecting.
