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Sf6 Insulated Combined Instrument Transformers Air Insulated Switchgears

Sf6 Insulated Combined Instrument Transformers Air Insulated Switchgears
Sf6 Insulated Combined Instrument Transformers Air Insulated Switchgears
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Product Code : Combined_SF6
Product Description

SF6 insulated combined instrumenttransformers are used to convert high transmission line voltages and currents(voltage up to 800kV and current up to 6000 A) to standardized low and easilymeasurable values, which will be used for metering, protection and control ofthe high voltage system. As such, the need for accurate and reliable voltageand current transformation is essential.

The reliability and security of Trench gas-insulatedinstrument transformers is based on over 50 years of innovation withgas-insulated units operating under a wide range of environmental conditions.Combined instrument transformers also ensure suitable electrical insulationbetween high voltage and low voltage measuring equipment.

Our gas-insulated combined transformers are compliant to thelatest international safety standard requirements in terms of explosion-proof,insulating material multiple chopped ageing, seismic qualification and extremetemperature conditions.

Modern production and testing facilities guarentee not onlyshort delivery times but also a reliable operation for many years.

General Features:


  • Complete portfolio available from 72 to 800 kV
  • Meet all lEC and ANSI metering and protection classes, including special core classes TPS, TPX, TPY and TPZ ones
  • Rated primary Voltage up to 800 kV
  • Rated primary current up to 6000A
  • CT ratings:
  • Rated secondary current of 1A, 2A or 5A
  • Rated short time thermal currrent up to 80kA Rated short circuit withstand up to 200 kAp
  • VT ratings:
  • Maximun simultaneous burden [IEC cl. 0,2] 150 VA
  • Maximun simultaneous burden [ANSI] 0,3Z/0,15Y
  • Thermal limiting output up to 3000 VA
  • Suitable also for Line Discharge use
  • Wide-range ferroresonance-free design without the use of an external damping device
  • Fully type tested according to international standards
  • Special tests are also available to meet specific customer requirements

Product Design:



  • SF6 is the main insulation medium
  • Explosion-proof design
  • External insulation with composite insulator; porcelain insulator available on request
  • External parts made of aluminum or stainless materials
  • Bar-type primary conductor allows higher short circuit current and avoids arge voltage drop across the primary winding
  • Available to withstand:
  • Internal arc effects [according to IEC 61869 protection stage 1 -]
  • Heavy seismic solicitations, according to IEC 62271, IEEE 693 and specific customers requests



Office No.-9, Plot 53/54, Sector-34, Space Heights, Near Tawa Hotel, Kamothe, Navi Mumbai - 410209, Maharashtra, India
Mr Piyush Lalchand Rathi (Partner)
Mobile :+919819614841, +919769207841
Mr. Dnyanesh Gawande (Partner)
Mobile :+919833686249