1, tap: suitable for power system operation needs of the general high voltage side of the transformer has a tap, can not fully guarantee tap synchronous switching, so there can not load tap running in parallel.
2, explosion-proof electric
wire rope winch voltage transformer: primary winding turns N1 much less secondary winding turns N2, equivalent to a step-down transformer. PT at work at the primary and secondary windings are connected in parallel, respectively, in the primary circuit and the secondary voltage control loop coil. Therefore,hoist equipment if the secondary winding is short-circuited, will result in very large secondary current.
3, Used / drawer: Handcart and drawers are high voltage switchgear and low voltage switchgear part, were installed high voltage circuit breakers and low voltage circuit breakers and relays and other components. They fixed switch function is basically the same,hoist and trolley the main difference is to facilitate maintenance and repair of electric hoist.