Solar Inverter Duty Transformers. Engineered for Harmonic Environments.
Multi-winding inverter duty transformers up to 18 MVA, 33 kV — purpose-built for solar power plants, battery storage systems, and VFD applications where standard transformers degrade prematurely.
Built for the Electrical Reality of Solar Generation.
Solar inverters and variable frequency drives do not produce clean sinusoidal current. They produce harmonic-rich waveforms that cause additional heating, insulation stress, and reduced lifespan in standard transformers designed for utility frequency power.
KLR Solar Inverter Duty Transformers are designed from the ground up for this electrical environment. The insulation system, winding geometry, and thermal design all account for the K-factor loading that inverter output places on the transformer — ensuring reliable, long-life performance in solar plants, BESS installations, and large VFD applications.
Technical Specifications
- Capacity range: Up to 20 MVA
- Voltage class: Up to 33 kV
- Transformer: Type Multi-Winding Inverter Duty Transformer
- Insulation System: Class A & Class B Oil-Impregnated Paper
- Cooling: ONAN / ONAF / OFAF
- Tank Design: Conventional Radiator Type Tank
- Standards: IS, IEC, ANSI, IEEE
- Winding Material: Electrolytic Grade Copper or Aluminium
- Winding Type: Foil / Disc / Helical / Layer
- Vector Group: Dyn11 / YNd1 / Multi-Winding Vector Groups as per Inverter Configuration
- Harmonic Capability: Designed for K-Factor Loading and Harmonic-Rich Environments
- Insulation Levels: Up to 170 kVp (As per Voltage Class and Applicable Standards)
- Tap Changer: Off-Circuit Tap Changer On-Load Tap Changer (In-Tank or External)
- Frequency: 50 Hz / 60 Hz
- Testing: Complete Routine Tests as per IS, IEC, ANSI, IEEE. Type Tests on request.
Key Features
- K-factor rated insulation system handles harmonic current without degradation. Purpose designed for inverter and VFD output
- Delta/star, delta/delta, zigzag options to match inverter topology, multi-winding configurations
- 12-pulse and 18-pulse configurations available to reduce grid harmonic injection phase-shifting capability
- Accounts for additional eddy current and stray losses from non-sinusoidal loading enhanced thermal design
- Optimised for integration alongside inverter skids in utility-scale solar plants, compact footprint
- Routine tests with documentation; type tests available on request full factory testing
Applications
- Utility-scale solar PV power plants (grid interconnection)
- Battery Energy Storage Systems (BESS) — AC coupling transformers
- Solar + storage hybrid plants
- Variable Frequency Drive (VFD) systems in large industrial plants
- Large motor drives — pumping stations, compressors, fans
- Chemical and process industries with variable load profiles
- EPC contractors for renewable energy infrastructure
Specify Your Solar Inverter Duty Transformer.
Share your inverter topology, MVA rating, and grid connection requirements — our engineering team will recommend the right winding configuration and K-factor rating.