double winding transformer
1.Type 12 ultra-low loss: More energy-saving than Type 11, higher efficiency, low long-term operating cost.
2.On-load voltage regulation: Voltage regulation without power outage, stable voltage, suitable for scenarios with large load fluctuations.
3.Forced oil circulation air cooling: Strong heat dissipation, high overload capacity, ideal for large-capacity main transformers.
4.Double-winding structure: For 35kV/110kV main transformers, reliable operation and easy maintenance.
5.Excellent short-circuit withstand capability: Low partial discharge, good insulation, long service life.
6.Suitable for substations, industrial and mining step-down stations, new energy power stations and large industrial parks.
SFPZ12 Series Transformer Product Details
1. Product Introduction
The SFPZ12 series is a three-phase, double-winding, oil-immersed power transformer with forced oil circulation and on-load voltage regulation. It complies with national standards such as GB/T 1094. The design number 12 represents a new generation of energy-saving products.
Its core function is to realize efficient power transmission and flexible voltage regulation at high voltage levels. It is suitable for 110kV, 220kV and other main power transmission and distribution scenarios, featuring large capacity, high stability and low loss. It serves as key equipment for regional power grids, large industrial hubs and new energy grid connection.
2. Technical Parameters（customizable）
| Item | Core Parameters (Typical Range) | Description |
Rated Capacity | 31500～300000kVA (31.5～300MVA) | Determines power transmission capacity, customizable |
Rated Voltage | HV: 110kV/220kV; LV: 10.5kV/35kV/6.3kV | Supports ±2×2.5% tap adjustment |
Rated Frequency | 50Hz | Complies with domestic power grid standards |
Connection Group | YNd11 | Suppresses 3rd harmonics, suitable for three-phase four-wire system |
Short-circuit Impedance | 8%～14% | Strong short-circuit withstand capability to ensure system safety |
No-load Loss | Low-loss design (≤15% below national standard limit) | High-quality silicon steel core, energy saving |
Load Loss | Low-loss copper winding design | Reduces long-term operating energy consumption |
Cooling Mode | OFAF/ONAF (Forced Oil Air Forced / Oil Natural Air Forced) | High-efficiency heat dissipation for large-capacity transformers |
Noise Level | ≤70dB (110kV class) | Low noise, environmentally friendly for urban areas |
Fully Sealed Structure | Capsule sealing / metal corrugated expansion type | Isolates air and moisture, extends oil service life |
3. Main Features
High Efficiency & Energy Saving
Adopts cold-rolled oriented low-loss silicon steel sheet (thickness ≤0.3mm) with full-step lap joint structure. Both no-load loss and load loss are better than national standards, greatly reducing electricity cost in long-term operation.
Strong Short-circuit Withstand Capability
Windings adopt tight binding and directed cooling structure. Clamps and iron core are integrally reinforced to effectively resist short-circuit electromagnetic force and improve operation reliability.
Flexible Voltage Regulation
Equipped with on-load tap changer, allowing stepless voltage regulation under load. It adapts to load fluctuations and ensures stable output voltage (regulation range ±5%).
Fully Sealed & Maintenance-free
Adopts fully sealed oil tank to isolate transformer oil from air, delay oil aging, reduce maintenance workload and extend service life.
High Insulation & Safety
High-voltage windings adopt continuous interleaved or internal shield structure with reinforced sections to improve impulse voltage distribution. The core is processed by vacuum drying, with low partial discharge and excellent insulation performance.
Strong Adaptability
Multiple voltage combinations and three-winding versions are available for customization, compatible with various power grid structures and industrial scenarios.
4. Application Scenarios
Regional Transmission Grids: Used as core equipment in 110kV/220kV key substations for regional power transmission and voltage conversion.
Large Industrial Hubs: Applied in steel, petrochemical, data centers and other heavy-load industrial bases.
Urban Grid Upgrading: Suitable for urban central substations and new district distribution projects with low noise.
New Energy Grid Connection: Used in wind and photovoltaic power station booster stations for efficient grid integration.
Industrial & Mining Enterprises: Provides dedicated power supply for mines, chemical industry and remote factories to ensure continuous production and safety.
