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High Voltage Instrument Transformers

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High Voltage Instrument Transformers

Instrument Transformers are an essential link for the safe and efficient operation of transmission networks. They provide accurate and reliable current and voltage measurements for secondary equipment such as meters, protections relays, bay computers and other devices.

GE has manufactured tens of thousands high voltage instrument transformers. Our customers recognize our top-of-the-line products for their long term robustness, safety and reliability.

GE offers a comprehensive range of instrument transformers up to 1,200 kV including Current Transformers, Magnetic Voltage Transformers, Combined Metering Units, Capacitor Voltage Transformer, GIS Voltage Transformers and Power Voltage Transformers.

Current Transformers
OSKF Oil-Insulated Current Transformers up to 800 kV GE’s OSKF have been designed for a 30 year lifetime and, thanks to the profound technical concepts, many well out-live this service life. The oil is hermetically sealed from the air by a stainless steel diaphragm assembly and all external parts are of corrosion-resistant material.
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SKF Gas-Insulated Current Transformers up to 550 kV The SKF is a top core current transformer with composite insulator. Cores, secondary winding and primary winding with solid primary conductor are assembled in the head housing. The SKF is compliant with IEC and IEEE or equivalent standards.
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Voltage Transformers
OTEF Oil-Insulated Voltage Transformers up to 550 kV GE manufactures a complete range of high voltage oil-filled voltage transformers (VTs). The OTEF is a tank-type potential transformer with post insulator. Thousands voltage transformers are in service worldwide, in all types of climates and under the most severe conditions.
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STEF Gas-Insulated Voltage Transformers up to 550 kV The STEF is a gas-insulated type voltage transformer with composite Insulators for 72.5 kV up to 550 kV. The STEF is compliant with IEC and IEEE or equivalent standards.
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Combined Metering Unit
KOTEF Oil-Insulated Combined CT/VT up to 420 kV KOTEF utilizes the same components as the individual CTs and VTs. Both transformers are combined in a single metering unit and are available in porcelain or composite. The KOTEF combines the advantages and design features of the OSKF and OTEF lines.
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KSKEF Gas-Insulated Combined CT/VT up to 550 kV The KSKEF provides both current and voltage measurement from a single device and uses same components as the individual CTs and VTs. The KSKEF is compliant with IEC and IEEE or equivalent standards. KSKEF is an excellent solution for adding metering capability to either a new substation installation or a site being upgraded where space is a premium.
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Capacitor Voltage Transformers
OTCF Coupling Capacitor Voltage Transformers up to 765 kV In high and extra high voltage transmission systems, capacitor voltage transformers (CVTs) are used to provide potential outputs to metering instruments and protective relays. In addition, when equipped with carrier accessories, CVTs can be used for power line carrier (PLC) coupling.
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CCV Capacitor Voltage Transformers and CC Coupling Capacitors up to 1,200 kV In high and extra high voltage transmission systems, capacitor voltage transformers (CVTs) are used to provide potential outputs to metering instruments and protective relays. In addition, when equipped with carrier accessories, CVTs can be used for power line carrier (PLC) coupling.
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Power Voltage Transformers
OTET Power Voltage Transformers up to 362 kV Power voltage transformers ensure high reliability and power availability for any critical load need up to as high as 100 kVA per phase. PVTs are used in high voltage transmission systems to provide low voltage energy directly from the lines. They are also called Station Service Voltage Transformers (SSVT).
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Instrument Transformers for GIS applications
Three-phase Voltage Transformer for GIS applications up to 550 kV GE offers compact VTs for GIS with a thermal capacity up to 4,000 VA. The GIS VTs are designed to avoid ferroresonance and mitigate high-frequency overvoltage conditions.
XD/GE Instrument Transformers
High voltage instrument transformers up to 1,100 kV. The XD/GE portfolio includes
  • High Voltage Current Transformers
  • High Voltage Capacity Voltage Transformers
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