110kV Oil-Immersed 3-Phase 2-Winding OLTC Power Transformer

110kV Oil-Immersed 3-Phase 2-Winding OLTC Transformer.

Intelligent voltage-regulating solution for critical 110kV grid nodes.

Rated 6.3 to 63 MVA, HV 110kV, LV 6.3-21kV.

Features ±8×1.25% on-load tap-changer, YNd11 vector group, and optimized losses (no-load 0.34%) for continuous and stable power quality.

Product Overview

This series is an intelligent voltage-regulating two-winding main power transformer designed for 110kV grid users requiring strict voltage stability and power quality.

By integrating proven transformer technology with online on-load tap-changing (OLTC) functionality, it provides an ideal solution for dynamic voltage optimization, ensuring a continuous and high-quality power supply to critical loads.

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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 21	YNd11	0.51	10.5	4.4	32
8000					0.51		5.3	38
10000					0.47		6.2	45
12500					0.47		7.4	53
16000					0.44		8.9	66
20000					0.44		10.6	79
25000					0.41		12.5	94
31500					0.41		14.9	111
40000					0.37	10.5~18	17.8	140
50000					0.37		21	175
63000					0.34		25	209

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Core Advantages

Dynamic Voltage Regulation (OLTC): Standard equipped with ±4×1.25%, ±6×1.25%, or ±8×1.25% tap ranges. Enables real-time voltage adjustment without power interruption. Prevents production downtime caused by grid fluctuations.
Flexible System Integration: HV rated at 110kV. LV side provides multiple distribution and industrial voltages (6.3kV, 6.6kV, 10.5kV, 21kV), perfectly matching various end-user connection scenarios.
Optimized Reliability & Efficiency: Standard YNd11 vector group simplifies relay protection. Short-circuit impedance is optimized for system stability, while no-load current is kept low (min 0.34%) to balance regulation precision with energy savings.
Wide Capacity Coverage: Ranging from 6.3 MVA to 63 MVA. Suitable for small-to-medium regional substations, industrial step-down substations, renewable energy grid connections, and user substations with strict power quality requirements.

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Typical Applications

110kV substations in urban areas and industrial parks with strict requirements for voltage qualification rates.
Dedicated substations for critical power users such as data centers, high-end manufacturing, and public infrastructure.
Step-up substations for renewable energy projects (wind/PV), especially suitable for grid connection points with significant voltage fluctuations.
Regional grid interconnection substations serving voltage support and regulation functions.

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