Grid Ready Flexible Transformer
What if There Was a Better Technical Solution?
Prolec GE Monterrey developed a new patented technology to offer a transformer with a flexible impedance range and multiple low voltages, the Grid Ready Flexible Transformer.
Factory Test Validation
To validate this new technology, Prolec GE developed a full-scale prototype:
- 60/80/100 MVA, 165-57.5/69/80.5 kV, with on-load tap changer
The unit was fully tested according to ANSI/IEEE standards at all LV ratings: (three sets of dielectric tests), heat run, excitation, losses and noise.
Field Validation
After factory test completion, the prototype was shipped to a US utility substation, where it was installed and energized. Field tests include continuous monitoring of critical performance parameters and on-line impedance variation to validate this feature in a real electrical grid condition.
Monitoring
Online 24 hour surveillance of critical parameters in the transformer:
- 35 sensors installed measuring load, voltage, gases, temperature, etc.
- Remote data collection and analysis; all performance data is analyzed by Prolec GE technical team at the factory
Scope
- Application: Interconnection autotransformers
- Phases: 3 phase units
- Taps: OTLC and DETC
- Capacity: 80 to 750 MVA three phase (top capacity rating)
- Voltage rating HV: Up to 345 kV
- LV multiple ratings: 2 or 3 voltage ratings (up to 230kV)
- Impedance ranges: Between 6 to 12 pp of the Z% (i.e. from 4%-16%, depending on voltage ratio and system requirements)
Benefits
- Lower asset management cost for utilities
- Permanent replacement—avoid additional installation costs compared to temporary alternatives
- Designed to meet customer specifications and particular requirements
- On-line or de-energized Impedance change (based on customer preference)
- Additional benefits of on-line impedance change include improved short circuit withstand and better reactive power management in the substation
- Transformer health management with a complete set of sensors and remote monitoring
