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Bushings
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
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The technology
R.I.P Resin Impregnated Paper |
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O.I.P Oil Impregnated Paper |
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Hybrid |
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SF6 insulated |
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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 |
PNO |
PSO |
PAO |
Oil to SF6 for the connection to the SF6 metal enclosed bus ducts
72,5-1050 kV |
POBO |
Oil to oil for the connection to the HV cables
72,5-1050 kV |
PCTO |
RIP technology
Resin Impregnated Paper transformer bushings
24-550 kV |
72,5-245 kV |
24-52 kV |
72,5-420 kV |
PNR |
PCTR |
PTFR/PTHR |
POBR |
Power Generator Bushings
RIP technology
Generator High Current RIP bushing up to 30 kV-45000 A
PGFR
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
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DC converters bushings
Hybrid technology for DC converter bushings (OIP + SF6 up to 1,100 kV; RIP + SF6 above 420 kV)
PHI
GIS bushings
Up to 550 kV
PABS
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.