Transformer Bushing

The vast majority of wall bushings currently used in power system are traditional oil-filled capacitance bushing with porcelain shell. Due to inherent defects including oil spill pollution, weak mechanical strength, low sealing property and antifouling property, explosive that endangers personal safety and equipment safety, etc, these products can no longer meet the operating requirement of miniaturization, oil-free, no(little) maintenance and high reliability for high voltage electric products raised by power department. The overseas dry wall bushing all apply epoxy resin impregnated paper capacitance core as major insulation, with porcelain shell or hollow composite insulator installed outside to bear mechanical loading and serve as external insulation, and cream of silicone grease kind filled between major insulation and external insulation. This kind of bushing has better property than oil-filled capacitance bushing with porcelain shell, but the customers would flinch at the lengthy delivery period, high price and imperfect after service. The FRP Capacitance Bushing, which is researched and developed by our company, is a new product of pure dry dry type composite shell capacitance bushing learning from design idea of like products overseas and adopting original new materials as well as manufacturing technology. Besides meeting GB4109-1999, IEC60137-1995 and related latest standard, it takes on the following distinct advantages:
1, Oil-free, gas-free, no filling, maintenance free.
2, Large insulation margin for the design and semiconductor capacitance screen, which raise discharge inception voltage to the maximum extent, with no partial discharge in operation.
3, Heat resisting and fire-retardant insulating material, with no decomposition, stable electric property, and no danger of combustion or explosion.
4, Compact structure, small volume, lightweight, convenient transportation, installation at any angle.
5, Reinforced winding of fiberglass and optimized mechanical laydown design, high bend strength, excellent mechanical property, suitable for earthquake-affected areas.
6, Short processing cycle, customized according to customer requirement.
7, Slastic composite shell has good antifouling property, self-cleaning without sweeping and applicable in heavily polluted areas.
8, Long service life, low long-term running cost.

The major insulation of FRP Capacitance Transformer Bushing is capacitance core, which is a pure solid capacitance core solidified under high temperature from insulating layers and capacitive screens that are twisted alternately and arranged one upon another. The insulating layers are made by computer-controlled winding machine according to geodesic line, and capacitive screens are made from semiconductor conformal material. Connecting flange is made if high-intensity aluminum alloy; Add sheds increasing creepage distance is molded by once injection of silicone rubber on the surface of capacitance core and forms an organic whole with it; High-intensity porcelain add sheds can also be installed additionally with vacuum casting of epoxy resin between porcelain housing and capacitance core.

Product Range
Wall bushing 12KV~252KV
Transformer bushing 24KV~550KV
GIS Outlet bushing 72.5KV~252KV
Oil/SF6 bushing 72.5KV~252KV
Oil/oil bushing 72.5KV~252KV
Heavy Current Bushing 5000A~31500A

Condition For Use
1, Suitable for power system between 10~220KV
2, Used both indoors and outdoors
3, Ambient Temperature: -40 C~+40 C
4, Height above Sea Level: ≤ 1000m, (additional design may be made for those above 1000m)
5, Angle of Installation: Installed at any angle
6, Pollution Class: Can be used in heavily polluted areas with pollution class above 3


Main Technical Parameter
1, Nominated voltage for the system (KV): 35, 66, 110, 220, 330, 500
2, Rated voltage (KV): 40.5, 72.5, 126, 252, 363, 550
3, Rated current (A): 250, 315, 400, 500, 630, 800, 1000, 1250, 1600, 2000, 3000