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HV Transmission Solutions

Home > HV/MV Equipment > Bushings, Insulators, Surge Arresters > Bushings

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GE provides cost effective solutions to facilitate the electric stress control of your equipment. Our bushings for electrical transmission offer AC and DC solutions with high-value customer benefits: longer lifetime and higher reliability, increased safety, no maintenance and installation flexibility.

Since 1923, GE’s bushings have been synonymous with excellence, quality and competence in the high voltage field. GE has its manufacturing plant and center of competence and development in Sesto San Giovanni (Milan), Italy..

Motivated to provide you with innovative and superior quality products, our vision remains focused on meeting customer requirements while anticipating and exceeding the needs of a continuously changing market.

GE’s solution advantages: RIP, OIP and Hybrid Bushings for AC & DC Applications

  • RIP - Resin Impregnated Paper up to 550 kV for power transformers
  • RIP - Resin Impregnated Paper up to 36 kV and 45kA for generator
  • OIP - Oil Impregnated Paper for voltages up to 1200 kV for power transformers
  • SF6 insulated up to 800 kV for GIS
  • HVDC – High Voltage Direct Current:
    • SF6 insulated through-wall bushings and up to 800kV
    • Hybrid SF6  - OIP insulated transformer bushings up to 800kV
      • Grading capacitor is encased by special fiberglass cones that ensure a triple barrier system between the transformer oil and the valve room. Hence Oil from the transformer cannot flow into the valve hall.
      • Direct gas leakages to the transformer are not possible thanks to pressure sensors installed on the OIP section prevents direct gas leakages to the transformer.
      • Oil in the grading capacitor ensures excellent thermal performances, specifically for higher current ratings (≥4500A) and harmonics due to the convertor operation. Risk of pollution of grading capacitor is eliminated due to non-exposure of paper roll during the installation of Bushing on Transformer
    • RIP insulated transformer bushings up to 550kV

Arc Test

The technology

  • GE’s hybrid HVDC converter bushing is based on two technologies: oil impregnated paper (OIP) for the grading capacitor that interfaces with the transformer and SF6 gas with a special composite insulator for the air side.
  • This hybrid technology complies with the strong request of the DC market to have dry type bushings and avoid the risk of oil spill inside the valve room. It is secured, reliable and safe and efficient.

Resin Impregnated Paper
  • Up to 550 kV
  • Power transformers (oil-to-air, oil-to-oil, oil-to-SF6)
  • Through-wall applications
  • AC Generators
Oil Impregnated Paper
  • Up to 1200 kV
  • Power transformers (oil-to-air, oil-to-oil, oil-to-SF6)
  • Through-wall applications
  • DC converter bushing up to 800KVDC
  • Based on two technologies: OIP+SF6 or RIP+SF6
SF6 insulated
  • Up to 800 kV
  • GIS, GIL and dead tank (air-to-SF6)
  • through-wall applications
  • Design parts patented

Power Transformers Bushings

OIP technology
Oil to air transformer bushings, for the connection to the HV transmission or distribution system

36-1200 kV

52-170 kV

25-765 kV




Oil to SF6 for the connection to the SF6 metal enclosed bus ducts

72,5-1050 kV


Oil to oil for the connection to the HV cables

72,5-1050 kV



RIP technology
Resin Impregnated Paper transformer bushings

24-550 kV

72,5-245 kV

24-52 kV

72,5-420 kV

Oil to air application

Oil to oil application

Oil to air transformer bushings

Oil to SF6 application


Power Generator Bushings 

RIP technology
Generator High Current RIP bushing up to 30 kV-45000 A

Wall Bushings

Gas insulated technology air to air

up to 800 kV AC & DC applications 
PWS (AC solution) and PWHS (DC solution)

OIP Technology
Up to 420 kV - PWO


DC converters bushings

Hybrid technology for DC converter bushings (OIP + SF6 up to 1,100 kV; RIP + SF6 above 420 kV)


GIS bushings
Up to 550 kV


Grid’s Resin Impregnated Paper (RIP) bushing passes an impressive internal arc test

In October 2013, an internal arc test was performed on a 420 kV RIP transformer bushing, type PNR 420 kV 1250A, in ZKU independent high voltage and high power test laboratory in Prague, Czech Republic.

The main aims of this test were to demonstrate the RIP bushing’s explosion proof capabilities, and to check its safety in the case of very dangerous events following an internal severe electrical fault.

To demonstrate this, a 420 kV normal production bushing was subject to an internal arc test with a short circuit current of 63 kA applied for 0.5 s. Safety is demonstrated if no parts are projected outside a circular safety area of 3 m radius around the bushing, and if no explosive events occur in the air side, i.e. the top part, of the bushing.

This video shows the effect of the simulated fault. The value of the measured injected energy during this test is impressive. The energy amounted to 13 MJ, which is equivalent to a 1000kg mass launched at a speed of 580 km/h or 360 mph!

This test, typical for other components such as instrument transformers, is a first for transformer bushings. In 2011 Alstom Grid was the first in the world to perform such an internal arc test on a 420 kV bushing based on the traditional oil-impregnated-paper technology and now it has repeated this success on the new 420 kV bushing, based on RIP technology.

Grid R&D teams have successfully tested our 820 KV/4500 A Bushings for HVDC converters, placing us as one of only three players to manufacture this technology. The bushings were designed in Milano, Italy and have now been fully type-tested and successfully completed their temperature rise tests over the rated current limit to confirm their suitability to meet all requirements.