Voltage transformers – Type VPU
VPU inductive voltage transformers incorporate an innovative open-core design that provides several operational advantages over conventional products. These include immunity to ferroresonance, explosion-proof construction, and robust resistance to transient overvoltages. Available in rated voltages from 72.5 kV to 550 kV, these transformers have been a trusted solution since 1965, with over 20,000 units currently in service globally.
Additional design features:
- Custom-made design – tailored to individual customer requirements
- Up to 6 secondary windings
- Partial discharge-free under AC test voltage
- Unique open-core magnetic design – immune to ferroresonance
- Robust insulation system designed to withstand very fast transient overvoltages
- Explosion-proof design, resistant to internal electrical arcs
- Oil expansion effectively managed by a stainless-steel membrane
- Broad operational temperature range from -60 to +60 °C
- Available in biodegradable insulating fluid-filled configurations
- Proven reliability in seismically active environments
- Optimized design with minimal oil requirements
- High operational safety with minimal maintenance requirements
