Core Positioning:
This product series represents an economical, reliable, and flexibly adaptable standard two-winding distribution transformer designed for 35kV medium-voltage distribution networks and industrial users. Widely used in industrial and mining enterprises, renewable energy power plants, urban distribution networks, and infrastructure power supply applications, it serves as a core component for efficient power conversion between medium-voltage grids and end-user loads.
Technical Specifications:
|
Rated capacity |
Rated voltage and tapping range |
Vector group |
No Load Current |
Short-circuit impedance |
No load Losses |
On load Losses |
||
|
HV |
Tapping range |
LV |
||||||
|
3150 |
35 |
±2×2.5 |
3.15 |
Yd11 |
0.36 |
7 |
1.7 |
20.7 |
|
4000 |
0.36 |
2 |
24.6 |
|||||
|
5000 |
0.36 |
2.4 |
28.2 |
|||||
|
6300 |
0.36 |
8 |
2.9 |
31.5 |
||||
|
8000 |
±2×2.5 |
3.15 |
YNd11 |
0.28 |
4 |
34.6 |
||
|
10000 |
0.28 |
4.8 |
40.8 |
|||||
|
12500 |
0.24 |
5.5 |
48.4 |
|||||
|
16000 |
0.24 |
6.7 |
59.2 |
|||||
|
20000 |
0.24 |
7.9 |
71.6 |
|||||
|
25000 |
0.2 |
10 |
9.4 |
84.6 |
||||
|
31500 |
0.2 |
11.1 |
100.8 |
|||||
Core Advantages and Features:
1. Flexible Voltage Configuration and Tapping Range:
- The high-voltage side covers the standard voltage range from 35kV to 38.5kV and offers two off-circuit tap-changing options, ±2×2.5% or ±5%, based on capacity, to meet different grid voltage adjustment requirements.
- The low-voltage side provides various common industrial and distribution voltages, including 3.15kV, 3.3kV, 6.3kV, and 10.5kV, meeting the connection needs of diverse user equipment.
2. Optimized Electrical Performance and Economy:
- Employs two standard vector groups, Yd11 or YNd11, depending on capacity, ensuring excellent system compatibility and facilitating engineering design and protection configuration.
- Short-circuit impedance is tiered (7%, 8%, 10%), achieving a good balance between limiting short-circuit current and ensuring voltage quality.
- The no-load current is as low as 0.2%, with excellent control over both no-load and load losses, resulting in high operational energy efficiency and significant lifecycle cost advantages.
3. Wide Capacity Coverage and High Reliability:
- The capacity range spans from 3.15 MVA to 31.5 MVA, meeting the requirements of most medium-voltage distribution and industrial users.
- The off-circuit tap-changing design features a simple, reliable structure and easy maintenance, making it particularly suitable for stable operating conditions where frequent voltage adjustment is not required.
Typical Applications:
- Main step-down substations (35kV) for industrial and mining enterprises and large commercial complexes.
- Collection and step-up substations (35kV) for renewable energy projects such as wind farms and photovoltaic power plants.
- 35kV distribution substations supplying power to regional loads within urban power grids.
- Dedicated power supply systems for large-scale infrastructure such as railways, ports, and airports.
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