Core Positioning:
This product series is an intelligent dynamic voltage-regulating two-winding power transformer designed for 66kV medium-high voltage grid applications with high requirements for voltage stability. It combines the classic two-winding structure with online on-load tap-changing (OLTC) functionality to provide stable and reliable high-quality power to the user side, particularly suitable for voltage-sensitive loads and grid environments with significant fluctuations.
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 |
63 |
±4×1.25 |
6.3 |
YNd11 |
0.48 |
9 |
4.4 |
30.8 |
|
8000 |
0.48 |
5.3 |
36.5 |
|||||
|
10000 |
0.45 |
6.2 |
43 |
|||||
|
12500 |
0.45 |
7.4 |
51.1 |
|||||
|
16000 |
0.42 |
8.9 |
62.8 |
|||||
|
20000 |
0.42 |
10.6 |
76.1 |
|||||
|
25000 |
0.38 |
12.5 |
90 |
|||||
|
31500 |
0.35 |
14.8 |
108 |
|||||
|
40000 |
0.35 |
17.7 |
126.9 |
|||||
|
50000 |
0.32 |
10~12 |
20.9 |
150.3 |
||||
|
63000 |
0.29 |
24.7 |
178.2 |
|||||
Core Advantages and Features:
1. Dynamic Online Voltage Precise Regulation:
- Standard equipped with an On-Load Tap-Changer (OLTC), offering three fine-tuning ranges: ±4×1.25%, ±6×1.25%, and ±8×1.25%. It enables real-time, continuous adjustment of the high-voltage side voltage without power interruption, effectively responding to grid voltage fluctuations and load changes to ensure the output voltage remains stable within the set range.
2. Wide Voltage Compatibility and Flexible Configuration:
- The high-voltage side supports three standard system voltages: 63kV, 66kV, and 69kV, adapting to different regional grid standards.
- The low-voltage side provides common distribution voltages such as 6.3kV, 6.6kV, and 10.5kV, meeting the connection requirements of various industrial and commercial users.
3. Optimized Electrical Performance and Reliability:
- Employs the standard YNd11 vector group, ensuring excellent system compatibility.
- Short-circuit impedance is optimized according to capacity (primarily 9%, with large-capacity models reaching 10~12%), facilitating system short-circuit current control and operational stability.
- While providing dynamic voltage regulation, the design maintains excellent no-load current control (minimum 0.29%), with both no-load and load losses optimized to balance functionality and energy efficiency.
4. Practical and Economical Capacity Coverage:
- The capacity range spans from 6.3 MVA to 63 MVA, suitable for small-to-medium renewable energy power plants, industrial park substations, urban distribution hubs, and dedicated substations with high voltage quality requirements.
Typical Applications:
- 66kV grid-connection step-up substations for renewable energy projects such as wind farms and photovoltaic power plants, particularly suitable for grid-connection points with significant voltage fluctuations.
- 66kV dedicated substations for industrial parks and large commercial complexes with high power supply quality requirements.
- Hub substations in regional distribution networks serving voltage support and regulation functions.
- Power supply substations for voltage-sensitive industrial loads, such as precision manufacturing and data centers.
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