The Medium-Voltage Switchgear,type 8BK88 is the latest Switchgear with the middle installation developed by SIEMENS in the middle 90s,Inside circuit Breakers SIEMENS 3AH series, with large current,high rupture, long mechnical life span etc.Its structure is compact with perfect performance,accord with GB3906-91 standard,can connect from front and lean against the wall for installation etc.
The Medium-Voltage Switchgear,type 8BK88 is used widely in power stations,transformer stations and switching substations,cement industry automotive industry lron and steelworks chemical industry and electron mechanical & oil industry areas,as well as indoor distribution of hotel,offi ce building higher-level residence situation. The Vacuum Circuit-Breakers installed in the Medium- Voltage Switchgear,type 8BK88 is suitable for:
● Rated voltages from 6KV to 12KV
● Rated short-circuit breaking currents up to 63KA
● Feeder and busbar rated currents up to 1250A,1600A,2500A,3150A,4000A
Features:
The excellent design of 8BK88 type 6-12KV metal-clad move-open switchgear fully displays such features as safety, flexibility, compactness, small size, the displacement of small movable carriage , and displays the new trend of the designs.
Operating while the door is closed and reliable interlock device ensure safety of the operator
Programmed operating methods
The operation of switch-on and switch-off
All the interlock device is mechanical. The interlock controlled by the key may prevent false operation
The 8BK88 switchgear can ensure enough electric strength , all bus sheets do not need to use other insulating materials
With a life of being used for more than 30,000 times , a life of 50-100 short circuit on and off. The vacuum breaker is free of maintenance The operating mechanism needs little maintenance
Flexibility of disposition
The 8BK88 switchgear can be combined and disposed conveniently and flexibly, which can meet many kinds of requirements Vacuum small breaker carriage
Vacuum small contactor carriage Separation carriage Voltage transformer carriage Carriage for the use of substaion transformer Lightning arrester carriage
Grounding carriage The switchgear allows wire-in and wire-out from the top or wire-in and wire-out from the bottom
Cabinet body
The cabinet body is formed by a whole plate , fixed by high strength rivets, it is hard to be out of shape, its grounding continuousness is good, and its arc-resistance performance is excellent;
The whole framework and the separation plates are made of zinc plates coated with aluminum, which ensures reliable grounding and long-term anti-corrosion ;the door, surface and the sealing plates are powder coated with light gray which is a standard color;
The carriages are supported by rails, they can be easily pulled out or pushed in through rolling bears
Vacuum breaker
The 8BK88 switchgear adopts 3AH serial vacuum breaker (ceramic arc-extinguishing chamber),which can meet any requirement of 10KV distribution room.Its rated current is up to 4000A.Short circuit switch-on and switch-off is up to 63KA,the full capacity of the switch-on and switch-off is up to 50~100 times,the mechanism life is up to 30,000 times (max is up to 60,000 times in special frequent occations);the 3AH breaker practical and economical, specially designed for the Chinese electric network, adopted the design of enlarging the creep distance and enhancing insulating,it is maintenance-free, the reignition will not occur when switching off / switching on the capacitor bank ,its power frequency withstand voltage is 42KV,the peak of surge withstand voltage is 75KV,thermal stability max current is up to 50KA/3s,the air net distance of bare parts with electricity is more than 125mm; its operating over- voltage is small. Therefore it is reliable and safe.
