Power voltage transformers with gas-insulated (sf6) insulation 35...550 kV

Power voltage transformers of the SSVT series, also sometimes called substation auxiliary transformers or substation service transformers, are designed and intended to convert high voltage directly from high-voltage network lines from 35 to 550 kV into low voltage.

Their main application is to provide electricity (own needs) to different types of substations (pulse, renewable and conventional). They also provide rural electrification, power to telecommunication towers in remote areas and temporary power supply when needed.

By design, power voltage transformers are of a support type with a bottom arrangement of windings in a grounded metal casing. The high voltage terminal is installed on the top of the insulating column of the transformer, and SF6 gas (sf6) is used as the internal insulating medium. For safety, voltage transformers are equipped with valves to relieve excess pressure that may occur in emergency situations. To indicate the SF6 gas pressure in transformers, two-channel pressure gauges are provided.


  • Rated high voltage from 35 to 550 kV
  • Voltage of secondary terminals up to 690 V*
  • Output power from 100 to 160 kVA
  • External insulation polymer
  • Ambient conditions: temperature -50° to +55°
  • Partial discharge level: ≤10 pC
  • Complies with IEC and IEEE standards or equivalent standards


  • Stable operation throughout the entire service life
  • No oil
  • Fireproof lightweight construction
  • Explosion-proof design

The description indicates the characteristics of transformers that are mass-produced. By agreement with the customer, it is possible to manufacture non-standard transformers.

500kV 400kV 330kV 275kV 230kV 220kV 161kV 150kV 138kV 132kV 115kV 110kV 88kV 69kV 66kV 63kV 46kV High-Voltage power voltage transformers, Service voltage transformer SF6, Power voltage transformers, Auxiliary transformer