Working conditions
Our high-voltage (HV) transformers are engineered for reliable operation under extreme conditions, including high altitudes, severe climates, seismic zones, and environments exposed to strong winds.
High-voltage SSTV transformer in paper-oil and SF6 insulation from 72.5 kV to 550 kV
Application
An auxiliary transformer in paper-oil or gas insulation (with SF6 gas) is a very versatile device combining the strengths of both power and distribution transformers. It is designed to provide auxiliary substation power supply, power for telecommunications and monitoring facilities, or as a temporary power supply. Additionally, these transformers can be used to energize remote areas by drawing power directly from high-voltage lines. They are available in voltage ranging from 72.5 kV up to 550 kV.
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Advantages
- Wide selection of versions and configurations tailored to specific customer requirements
- Flexible power source enabling independence from external suppliers
- Cost-efficient and highly reliable substation power supply
- Dual functionality – operates as a transformer or auxiliary power source
- Maintenance-free over the entire service life
- Environmentally safe design using premium PCB-free insulating oils
- Fully sealed and waterproof construction
- Designed to meet the full scope of standard-required type tests
Electrical data
Maximum operating voltage
72.5–550 kV
Withstand mains frequency voltage
140–680 kV
Lightning impulse withstand voltage (BIL)
325–1,550 kVp
Switching impulse withstand voltage
Up to 1,175 kVp
Load
10–100 kVA
Standard creepage distance
1,825–17,050 mm
Mechanical data
Weight
285–3,500 kg
Base dimensions (min.)
400x430 mm
Base dimensions (max.)
1,453x1,220 mm
Height (min.)
1,645–5,800 mm
Downloads
Catalog of HV transformers
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"SSVT HV auxiliary power voltage transformers in paper-oil and SF6 insulation from 72.5 kV to 550 kV"
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Table of contents:
Table of contents:
High-voltage SSTV transformer – Design
Our station service voltage transformers (SSTV) are manufactured in both paper-oil and gas-insulated versions. While the overall design concept is similar, the insulation medium differs depending on the model. A hermetically sealed metal tank contains the magnetic core surrounded by primary and secondary windings.
Paper-oil insulated transformers use layers of paper impregnated with environmentally safe, PCB-free oil. Metal bellows are incorporated to allow monitoring and adjustment of the oil level. In the gas-insulated version, electrical insulation is provided by sulfur hexafluoride (SF6). A side-mounted inlet valve enables monitoring of pressure and possible gas leakage.
These transformers are able to provide low-voltage power supply to remote areas by directly transforming the electricity from high-voltage lines.
