High-voltage transformer bushing 550kv/1250a

Key Attributes.

We are an ISO9001:2008 certified Chinese transformer bushing supplier, with voltage class between 1kv-550kv. The electrical and mechanical performances meet the requirements of GB/T4109-2008 and IEC 60137 Ed.6.0. Our OIP bushings are full sealed consisted of condenser core, upper and lower porcelain, connceting flange, oil reservoir, connecting plate and sealing parts. The general connection is by the strength of pressed spring and the connection of flange with upper porcelain is bonded to enhance cantilever load. The bushing main insulation, the condenser core of layers column type capacitors are wrapped with HV cable paper impregnated in insulating oil and aluminum foil. Testing tap on the flange is used to measure dielectric loss and partial discharge (363kv and above level with the oil plug). The insulation oil inside the bushing is adjusted by the reservoir on the top and the oil level can be observed from the indicator on it (252kv and above level with Magnetic indicator). The currents are carried by the cable through central tube of the drawlead type bushings and are carried by the tube of the drawrod rype bushings (current above 2500A), all the bushings are install with the bottom shield on the end. Main characteristics compared with OIP bushings: 1. For the small diameter and light weight of the bushings, it is possible to reduce the structre dimensions and weight of the transformers. 2. Oil collection box is integrative structure with less sealing parts and ensure the reliable seal. 3. The improvement for the testing tap ensure reasonable structure and reliable performance. Operation Conditions Ambient temperature is in the range of minus 45 degrees to minus 40 degrees centigrate. Maxium mounting angle off of the vertical is 30 degrees. Altitude should not be more than 1500m. Please negotiate with the manufacture if 1500m above height is needed.