Core Positioning:
This product series represents a standard, cost-effective, and highly efficient two-winding main power transformer designed for 110kV high-voltage transmission/distribution networks and large-scale power users. It employs mature and reliable off-circuit tap-changing technology, featuring a simple structure and easy maintenance, making it a primary solution for efficient power conversion and reliable supply between high-voltage grids and medium/low-voltage 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 |
||||||
|
6300 |
110 |
±2×2.5% |
6.3 |
YNd11 |
0.5 |
10.5 |
4.1 |
32 |
|
8000 |
0.5 |
4.9 |
38 |
|||||
|
10000 |
0.46 |
5.8 |
45 |
|||||
|
12500 |
0.46 |
6.8 |
53 |
|||||
|
16000 |
0.43 |
8.3 |
65.7 |
|||||
|
20000 |
0.43 |
9.7 |
79 |
|||||
|
25000 |
0.4 |
11.4 |
94 |
|||||
|
31500 |
0.38 |
13.5 |
111 |
|||||
|
40000 |
0.36 |
16.2 |
133 |
|||||
|
50000 |
0.34 |
19.4 |
158 |
|||||
|
63000 |
0.3 |
22.9 |
187 |
|||||
|
75000 |
13.8 |
0.26 |
12-14 |
26 |
212 |
|||
|
90000 |
0.24 |
29.9 |
245 |
|||||
|
120000 |
0.22 |
37.3 |
303 |
|||||
|
150000 |
0.19 |
44.1 |
359 |
|||||
|
180000 |
0.16 |
49.5 |
411 |
|||||
Core Advantages and Features:
1. Excellent Economy and Reliability:
- Utilizes an off-circuit tap-changing (NLTC) design with a simple structure and fewer mechanical components, resulting in high operational reliability, low maintenance costs, and significant advantages in Total Cost of Ownership (TCO) over its lifecycle.
- The high-voltage side supports three standard system voltages: 110kV, 115kV, and 121kV, and is equipped with a ±2×2.5% tap-changer to meet general voltage fluctuation adjustment requirements.
2. Wide Capacity and Voltage Coverage for High Adaptability:
- Offers a complete capacity series from 6.3 MVA to 180 MVA, meeting the capacity demands of various regional substations, renewable energy power plants, and large industrial users.
- Flexible low-voltage side configuration:
- Medium-to-small capacity models (≤63 MVA) primarily cover common distribution voltages such as 6.3kV, 6.6kV, and 10.5kV.
- Medium-to-large capacity models (≥75 MVA) provide higher industrial voltage levels including 13.8kV, 15.75kV, 18kV, and 21kV.
3. Optimized Electrical Performance and High Efficiency:
- Employs the standard YNd11 vector group, ensuring excellent system compatibility and facilitating relay protection configuration.
- Short-circuit impedance is optimized according to capacity (10.5% or 12~14%), effectively balancing short-circuit current limitation and voltage stability.
- No-load current is as low as 0.16%. Both no-load and load losses are systematically optimized, achieving leading energy efficiency levels and outstanding long-term operational economy.
Typical Applications:
- Main transformers for 110kV regional substations and end-user substations.
- Main transformers for step-up substations in renewable energy projects such as wind farms and photovoltaic power plants.
- Primary or backup substations for large industrial enterprises and industrial parks.
- Core nodes in urban power grids responsible for power distribution and conversion.
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