Presenting our 35kV 3150kVA Three Phase Low Loss Distribution Transformer—a cutting-edge solution engineered with advanced oil-immersed technology to achieve exceptionally low no-load and on-load losses. Designed in strict adherence to standards such as ANSI C57.12.00, IEC 60076, GB 1097, and GB/T6451, this transformer features a premium C.R.G.O. core and oxygen-free copper windings for precise voltage control and enhanced durability. Tailored for high-voltage industrial applications and urban substations, our transformer delivers a sleek, reliable, and safe power distribution solution that meets the demanding energy needs of modern infrastructure.
Core (Magnetic Circuit System)
| Material |
Made of high-permeability cold-rolled silicon steel sheets (e.g., 30ZH120 or higher grade), precisely stacked with staggered joints to reduce magnetic resistance and eddy current losses. |
| Features |
Low no-load losses (S13 model reduces losses by approximately 30% compared to older models) and a noise-free laminated design. |
Winding (Electrical Circuit System)
| High-Voltage Winding |
The 35kV side typically adopts a multi-layer cylindrical or continuous structure, using copper (or aluminum) conductors wrapped with insulating paper to enhance short-circuit withstand capability. |
| Low-Voltage Winding |
The 0.4kV side often employs a foil winding structure to minimize eddy current losses and improve efficiency. |
| Insulation |
Nomex paper or DMD insulation material combined with a vacuum pressure impregnation (VPI) process to enhance the thermal rating (H-class or F-class). |
Insulation & Cooling System
| Insulating Oil |
Uses naphthenic mineral oil or environmentally friendly synthetic ester oil, providing high dielectric strength and oxidation resistance. |
| Cooling Structure |
Equipped with fin-type radiators or a corrugated oil tank, utilizing natural convection cooling (ONAN), eliminating the need for additional fans and reducing maintenance requirements. |
Tank & Sealing System
| Tank |
Fully sealed corrugated steel tank that accommodates thermal expansion and contraction of the oil, ensuring a maintenance-free design. |
| Protection Rating |
IP55 or higher, offering dustproof and waterproof capabilities, suitable for harsh outdoor environments. |
Protection Devices
| Gas Relay (Buchholz Relay) |
Monitors internal faults by detecting gas accumulation, triggering alarms or tripping mechanisms. |
| Pressure Relief Valve |
Automatically releases excessive pressure to prevent oil tank rupture. |
| Sudden Pressure Relay |
Quickly responds to internal arc faults by disconnecting the power supply. |
Tap Changer
| Off-Load Tap Changer (OLTC or NLTC) |
Provides ±5% or ±2×2.5% voltage adjustment, typically located on the high-voltage side, manually operated to accommodate grid fluctuations. |
Bushings & Terminals
| High-Voltage Bushings |
Porcelain or composite insulated bushings (e.g., silicone rubber) rated for 35kV, with creepage distance meeting IEC standards. |
| Low-Voltage Bushings |
Resin-cast bushings with an anti-pollution flashover design. |
Product Specifications
| Rated Capacity |
3150kVA（3.15MVA） |
| Rated Voltage |
High Voltage Side 35kV ±5%
Low Voltage Side 0.4kV |
| No-Load Loss (P₀) |
≤2.1kW |
| Load Loss (Pₖ) |
≤23kW (at 120℃) |
| Short-Circuit Impedance (Uk%) |
6% or 4.5% (optional) |
| Efficiency |
≥99% (at full load) |
| Insulation Level |
High Voltage Side LI200kV / AC85kV
Low Voltage Side LI75kV / AC35kV |
| Cooling Method |
ONAN (Oil Natural Air Natural) |
| Vector Group |
Dyn11 |
| Noise Level |
≤55dB(A) (no-load, measured at 1m distance) |
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