69kV / 33kV ONAN Power Transformer with Vacuum Switchgear
10MVA to 30MVA copper-wound power transformer paired with high-voltage vacuum circuit breakers for primary step-down substations.
Explore our certified range of oil-immersed and cast resin dry-type transformers, integrated with high-speed vacuum circuit breakers (VCB) for power utility feeders, solar/wind renewables, and heavy metal foundries.
10MVA to 30MVA copper-wound power transformer paired with high-voltage vacuum circuit breakers for primary step-down substations.
1250kVA - 4500kVA fire-safe epoxy cast resin distribution transformer integrated with indoor vacuum interrupter panels.
Precision 3-phase isolation transformer featuring electro-static shielding and fast-acting vacuum breaker protection for industrial plants.
Ultra-low loss epoxy cast dry-type unit optimized for high-frequency switching operations and minimal partial discharge.
High-reliability 15kV to 0.4kV step-down transformer engineered for data centers demanding zero downtime and rapid vacuum protection.
IEC 60076 compliant 20kV dry-type distribution system engineered with integrated vacuum interrupter contacts for utility networks.
Medical-grade dry type isolation transformer system incorporating ultra-fast vacuum circuit breakers to isolate heavy surge transients.
Compact 3-phase AC isolation unit equipped with high-durability vacuum interrupter contacts for industrial machinery protection.
In modern medium and high-voltage power networks, the Vacuum Circuit Breaker (VCB) represents the pinnacle of switching technology. Unlike oil or SF6 gas breakers, vacuum breakers utilize a high-vacuum chamber (pressures between $10^{-5}$ Pa and $10^{-7}$ Pa) to quench electrical arcs almost instantly during current zero-crossing.
When contact separation occurs under fault conditions, metal vapor plasma is emitted from the copper-chromium (CuCr30/CuCr50) contacts. As the alternating current approaches zero, the metal vapor rapidly condenses on the surrounding ceramic interrupter shield, restoring dielectric strength at rates exceeding 20 kV/µs. This prevents arc reignition even under severe Transient Recovery Voltage (TRV) stress.
At our Rajkot manufacturing facility, we integrate continuous foil-wound distribution transformers directly with vacuum circuit breaker switchgear. This eliminates wire transposition joints, evenly distributes axial short-circuit electromagnetic forces, and delivers over 30,000 mechanical operations without contact degradation.
Our vacuum interrupters feature state-of-the-art Axial Magnetic Field (AMF) electrodes. By creating a magnetic field parallel to the arc axis, the arc remains in a diffuse mode rather than constricting into a high-temperature focal spot. This keeps contact erosion rates under 0.1 mm per 10,000 operations and ensures complete short-circuit interruption up to 40kA.
Operating from our state-of-the-art industrial complex in Rajkot, Gujarat (India) since 2004, Synergy Transformers combines heavy engineering capability with rigorous routine, type, and special testing protocols.
As environmental regulations eliminate SF6 gas from electrical grids globally, procurement teams are shifting rapidly toward eco-friendly vacuum switching and solid-dielectric insulation architectures.
Global decarbonization standards (such as EU F-Gas Regulations and IEEE C37.85) mandate the phase-out of SF6 gas due to its high Global Warming Potential (GWP 23,500). Modern substations deploy dry air or nitrogen-shielded vacuum interrupters, eliminating greenhouse gas liabilities while guaranteeing zero dielectric degradation over a 30-year lifecycle.
Next-generation vacuum circuit breakers integrate real-time optical fiber temperature sensors, contact erosion micro-meters, and wireless vibration diagnostics. Predictive algorithms analyze coil operating currents and vacuum pressure stability, allowing utility operators to shift from scheduled maintenance to continuous condition-based monitoring.
To counter harsh ambient environments—such as coastal salt spray, desert dust, and mining moisture—vacuum interrupters are now encapsulated directly in epoxy resin or silicone rubber. This solid insulation prevents condensation flashovers and eliminates explosion risks in compact secondary substations (CSS).
Review our standard engineering parameters for utility, renewable energy, and heavy industrial applications. Custom configurations are validated via guaranteed technical particulars (GTP).
| Equipment Type | Rated Voltage (kV) | Interrupting Rating (kA) | Insulation Class | Standard Compliance |
|---|---|---|---|---|
| Substation Vacuum Circuit Breaker (VCB) | 11kV / 22kV / 33kV / 69kV | 25kA - 40kA (3 sec) | Solid / Vacuum / Air | IEC 62271-100 / IEEE C37.09 |
| Cast Resin Dry Type Transformer | Up to 33 kV | Custom Impedance | Class F (155°C) / Class H (180°C) | IEC 60076-11 / IS 1180 Level 1 & 2 |
| Solar / Wind Inverter Duty Unit | 11kV to 33kV Step-Up | Harmonic Shielded | ONAN / ONAF / Cast Resin | IS 2026 / IEC 60076 |
| Induction Furnace Duty Unit | 11kV to 33kV HV | Heavy Current LV | ONAN / OFWF Reinforced | Heavy Duty Application Class |
| Compact Secondary Substation (CSS) | 11kV / 22kV / 33kV | 20kA - 31.5kA | IP54 Outdoor Kiosk | IEC 62271-202 |
Vacuum breakers utilize a high-vacuum dielectric medium ($10^{-5}$ Pa) where arc plasma rapidly diffuses during AC zero-crossing. They offer significantly higher electrical endurance (10,000 to 30,000 operations), zero fire hazard compared to oil breakers, minimal contact erosion, and virtually maintenance-free operation across their service life.
High-speed vacuum breaker switching can generate steep-front transient recovery voltage (TRV) spikes. Synergy’s continuous copper and aluminium foil winding eliminates layer-to-layer wire crossovers, distributes transient voltage stress uniformly across the coil, and improves axial short-circuit strength—preventing insulation breakdown under repetitive switching.
Our transformers and vacuum switchgear units comply with IEC 60076, IEC 62271-100, IEC 62271-202, IS 2026, and IS 1180 (Energy Efficiency Level 1 and Level 2). Every unit undergoes 100% routine testing in our Rajkot test bay, including voltage ratio, winding resistance, insulation resistance, partial discharge, and separate-source power-frequency withstand tests.
Yes. We regularly accommodate third-party inspections by agencies such as Bureau Veritas, SGS, TÜV, and Lloyd's Register. Clients are invited to witness routine tests, lightning impulse tests, and temperature rise tests at our factory in Rajkot, Gujarat before export packing.
Standard distribution transformers and standard vacuum breaker panels are manufactured within 3 to 5 weeks following GA drawing approval. Custom power transformers, furnace duty units, and compact secondary substations (CSS) typically require 6 to 10 weeks depending on rating, tap-changer specifications, and accessory scope.
All units destined for international export undergo seaworthy packaging inside heavy-duty timber crates. Transformers are shipped either oil-filled or nitrogen-pressurized with desiccants, while vacuum interrupter chambers are shock-mounted to withstand severe maritime accelerations.
Submit your single-line diagram (SLD), voltage class, vector group, or project RFP to our pre-sales engineering team in Rajkot, India. We deliver complete technical proposals and competitive factory-direct pricing within 24 hours.