110kV Oil-Immersed 3-Phase 3-Winding OLTC Power Transformer

Our 110kV oil-immersed three-phase two-winding on-load tap-changing power transformers are intelligent voltage-regulating solutions for grid nodes requiring stable power quality.

• Equipped with on-load tap-changer offering ±4×1.25%, ±6×1.25%, or ±8×1.25% ranges for real-time voltage adjustment without power interruption.

• HV rated at 110kV; LV options from 6.3kV to 21kV covering diverse distribution and industrial applications.

• Rated from 6.3 MVA to 63 MVA with optimized short-circuit impedance and no-load current as low as 0.34% balancing regulation precision with energy efficiency.

• YNd11 vector group ensures excellent system compatibility and straightforward protection configuration.

• Fast delivery, reliable quality, responsive service, and extensive project experience backed by our company.

Core Positioning:

This product series represents a high-precision, intelligent voltage-regulating three-winding transformer designed for critical 110kV grid hubs with stringent requirements for voltage stability and power supply quality. It deeply integrates multi-voltage level capability with online on-load tap-changing (OLTC) technology, making it the preferred high-end solution for ensuring continuous, high-quality power supply to important loads and enabling dynamic grid voltage optimization management.

Technical Specifications:

Rated capacity (kVA)	Rated voltage and tapping range			Vector group	No Load Current (%)	Short-circuit impedance (%)	No load Losses (kW)	On load Losses (kW)
Rated capacity (kVA)	HV	Tapping range	LV	Vector group	No Load Current (%)	Short-circuit impedance (%)	No load Losses (kW)	On load Losses (kW)
6300	110	±4×1.25 ±6×1.25 ±8×1.25	6.3 6.6 10.5 11	YNyn0d11	0.61	HV~MV: 10.5 HV~LV: 17.5~19 MV~LV: 65	5.3	40
8000					61		6.3	48
10000					0.57		7.5	56
12500					0.57		8.9	67
16000					0.54		10.6	81
20000					0.54		12.5	95
25000					0.5		14.9	113
31500					5		17.7	134
40000					0.46		21.2	161
50000					0.46		25	192
63000					0.42		29.8	230

Core Advantages and Features:

1. Real-time Dynamic Voltage Precision Control:

- Integrated On-Load Tap-Changer (OLTC) provides three fine-tuning ranges: ±4×1.25%, ±6×1.25%, and ±8×1.25%. It enables continuous online adjustment of the high-voltage side voltage without power interruption, ensuring highly stable output voltage on the medium and low-voltage sides despite grid fluctuations or rapid load changes, significantly enhancing power supply reliability and power quality.

2. Compact Integration and Multi-interface Compatibility:

- Utilizes an integrated three-winding (High Voltage, Medium Voltage, Low Voltage) design. A single unit can meet the interconnection and power distribution requirements between high-voltage transmission grids (110kV), medium-voltage distribution networks (e.g., 35kV, implied by impedance), and low-voltage user sides (6.3-11kV), greatly optimizing substation spatial layout and system architecture.

- The standard low-voltage side offers multiple common distribution voltages, including 6.3kV, 6.6kV, 10.5kV, and 11kV, adapting to various industrial and commercial user needs.

3. Optimized Impedance Design and System Compatibility:

- Employs a fixed short-circuit impedance configuration (HV-MV: 10.5%, HV-LV: 17.5~19%, MV-LV: 6.5%), facilitating coordinated system short-circuit current control and protection coordination, thereby enhancing grid operational stability.

- Utilizes the standard YNyn0d11 vector group, a mature and widely compatible technology for easy integration with existing grids.

4. Balanced High Performance and Economy:

- The capacity range spans from 6.3 MVA to 63 MVA, comprehensively meeting the needs of regional hub substations, important user substations, and renewable energy grid-connection points.

- While providing dynamic voltage regulation, advanced electromagnetic design and manufacturing processes keep the no-load current at a relatively low level (minimum 0.42%), achieving an excellent balance between functionality and energy efficiency.

Typical Applications:

- 110kV urban core area substations with critical requirements for voltage qualification rates.

- Dedicated substations for important power users such as large data centers, high-end manufacturing facilities, and research institutions.

- Regional grid interconnection substations or renewable energy collection stations serving voltage support and regulation functions.

- Comprehensive hub substations requiring multi-voltage level integration and automatic voltage regulation capability.

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