GW7A-252˘ń series perfect improved disconnect switch is three-phase AC 50Hz outdoor HV electrical equipment of three-column horizontal rotation type. It is used for no load changing-over of HV line, as electric isolation between examined HV bus line,breaker and other electric equipments and charged high-voltage line.
There are different specifications available for the product as below:
Divided as per wether or not with grounding switch: ungrounded,left grounded,right grounded,double grounded,equiped with JW7-252˘ńtwo-step action type perfect improved earth switch.
GW7A-252˘ńseries perfect improved disconnect switch includes three single-pole,and each pole is three-column structure consists of base,surpport insulator,conductive parts,operation mechanism etc. Each pole consists of three insulation support with two fixed surpport at the ends and movable middle surpport. Movable switch blade is placed on the top of middle insulation surpport,and fixed contact is seprately installed on the top of other two surpport insulator on the sides. The operation mechanism drive the middle surpport insulator to realize opening and closing operation. Provided mechnical interlock device between disconnector and earth switch.
Disconnector is made into sing-pole type and can realize three-stage operation through link rod between poles. Main switch blade is equiped with CJ6G type perfect improved electric mechanism.Earth switch with CGS perfect improved manual mechanism. The manual mechanism also can be equiped with new type DSW4 electromagnetic lock according to users’ requirment.
A.Adopts U type contact finger and new contact finger base structure to avoide defects that original structure make against stable flow, and make contact spring to be insulated to avoid that spring lose effectiveness because of long time overheat.
B.Adopts buffer structure for fixed contact of main switch blade to reduce impact produced by closing of fixed contact and movable contact and get reliable action
C.Adopts fully sealed structure for bearing seat, and fully covering enough molybdenum disulfide lithium grease on bearing surface to make sure long-term reliable rotation.
D.Main earth switch is provided lift regulating device convenient for on-site installation and commissioning.
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