The Non-excitation voltage regulation power distribution transformer is a line of high-performance, three-phase, oil-immersed distribution transformers designed for reliable power supply in grid and industrial applications. Featuring a robust off-circuit tap changer (OCTC) for manual or electric voltage adjustment within a preset range, these transformers are engineered for stability and long-term operation. Manufactured in full compliance with Chinese National Standards GB1094 and GB/T6451, the series offers tiered energy efficiency options (including advanced amorphous alloy cores) to meet diverse economic and environmental requirements.
Product Features
• Standard-Compliant & Reliable
Designed and manufactured in strict accordance with GB1094 (Power Transformers) and GB/T6451, ensuring product safety, performance, and interoperability.
• Stable Voltage Adjustment
Equipped with a reliable Off-Circuit Tap Changer (OCTC) offering an adjustment range of ±2x2.5% for both 10kV and 35kV models, allowing for fine-tuning of output voltage during de-energized states to maintain power quality.
• Robust Mechanical & Sealed Construction
The core and winding assembly is secured with a unique three-point (top, middle, bottom) positioning system with anti-loosening and anti-vibration measures, enhancing transport and operational stability. The tank utilizes high-quality steel and advanced acrylate rubber gaskets to ensure a long-term, leak-proof seal.
• High Efficiency Options
Available in multiple energy efficiency tiers (Level 1, 2, 3) with core materials including high-grade grain-oriented silicon steel and ultra-low-loss amorphous alloy, allowing customers to optimize initial investment against long-term energy savings.
• Flexible Configuration
Supports various vector groups (e.g., Dyn11, Yyn0) and is available in a fully sealed ("S") design (as per model code) to minimize maintenance.
Specifications & Parameters
| Category | Specification / Description |
| Type | Three-Phase, Oil-Immersed, Double-Winding, Sealed Tank (S-series) |
| Rated Voltage | 10 kV or 35 kV (Primary Side) |
| Voltage Regulation | Off-Circuit Tap Changer (OCTC): ±2×2.5% |
| Rated Capacity | Range From 30 kVA to 2500 kVA (Standard range, extendable) |
| Vector Groups | Dyn11, Yyn0, etc. |
| Efficiency Standards | Complies with Chinese Energy Efficiency Class 1, 2, and 3 levels. |
| Core Material Options | Grain-Oriented Silicon Steel (Standard) or Amorphous Alloy (High-Efficiency) |
| Cooling Method | ONAN (Oil Natural Air Natural) |
Key Performance Data (10kV Series Example)
The table below illustrates the tiered loss values for the 10kV series with different core materials. Please contact us for the complete and detailed datasheet.
| Capacity (kVA) | Efficiency Level 1 | Efficiency Level 2 | Efficiency Level 3 | |||
| Silicon Steel No-Load (W) | Amorphous No-Load (W) | Silicon Steel No-Load (W) | Amorphous No-Load (W) | Silicon Steel No-Load (W) | Amorphous No-Load (W) | |
| 100 | 120 | 60 | 135 | 75 | 150 | 75 |
| 315 | 270 | 135 | 305 | 170 | 340 | 170 |
| 1000 | 665 | 360 | 745 | 450 | 830 | 450 |
| Note: Load loss values vary by vector group and material. Refer to the full parameter table for details. | ||||||
Packaging, Warranty & Certifications Packaging：
The transformer is shipped fully assembled. The main tank is filled with nitrogen for protection and securely mounted on a heavy-duty skid base suitable for all transport modes. Detachable radiators and accessories are packed in robust, weather-protected wooden crates.
Warranty：
We provide a standard 12-month warranty from the date of successful commissioning or 18 months from the date of shipment, whichever occurs first. The warranty covers defects in materials and workmanship under normal operation.
Certifications & Testing：
Our manufacturing quality management system is certified. Products are designed, tested, and produced in strict accordance with GB1094 and GB/T6451 standards. Each unit undergoes comprehensive routine tests, including turns ratio, winding resistance, impedance voltage, no-load & load loss measurement, and dielectric withstand tests.
