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

110kV Oil-Immersed 3-Phase 3-Winding NLTC Transformer.

Multifunctional hub transformer for 110kV grids.

Rated 6.3 to 63 MVA, HV 110-121kV, LV 36-38.5kV.

Features ±2×2.5% taps, dual-mode impedance configuration (Boost/Decompression), and YNyn0d11 vector group to simplify substation layout and lower investment costs.

Product Overview

This series represents a multifunctional, compact three-winding hub transformer designed for 110kV medium-high voltage grids.

By integrating high-voltage transmission, medium-voltage distribution, and low-voltage reactive power compensation within a single unit, it provides an economical solution for simplifying substation layouts and enabling flexible conversion across multiple voltage levels.

Three-winding internal structure enabling multi-voltage integrationjpg

Three-winding internal structure enabling multi-voltage integration.

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 (%)	Principal Tap	Maximum Tap	No load Losses (kW)	On load Losses (kW)
6300	110 115 121	±2×2.5	36 37 38.5	YNyn0d11	0.53	HV~MV: 17.5~18.5 HV~LV: 10.5 MV~LV: 6.5	HV~MV: 10.5 HV~LV: 17.5~19 MV~LV: 6.5	4.9	40
8000					0.5			5.8	48
10000					0.47			6.9	56
12500					0.45			8.1	67
16000					0.42			9.8	81
20000					0.42			11.6	95
25000					0.38			13.5	113
31500					0.38			16.2	134
40000					0.35			19.1	161
50000					0.35			22.9	192
63000					0.32			27.1	230

Core Advantages

Compact Hub Design: Three-winding structure (HV, MV, Tertiary) connects 110kV grids, 35kV networks, and 10kV compensation devices in one unit. Significantly reduces substation footprint and civil investment costs.
Unique Dual-Mode Impedance: Choose between "Boost Mode" (high HV-MV impedance) for generator-side grid connection, or "Decompression Mode" (high HV-LV impedance) for load-side step-down supply. Optimizes short-circuit levels without redesigning your system.
Flexible Voltage Adaptation: HV side covers 110kV, 115kV, and 121kV. The low-voltage (tertiary) winding is standardized at 36kV, 37kV, or 38.5kV, allowing direct use for reactive power compensation or auxiliary power.
Proven Efficiency & Reliability: Capacity from 6.3 to 63 MVA with YNyn0d11 vector group for easy protection configuration. Optimized low-loss design (no-load current down to 0.32%) ensures excellent long-term operational economy.

ngineered for critical 110kV hub substations and complex grid nodesjpg

Engineered for critical 110kV hub substations and complex grid nodes.

Typical Applications

110kV/35kV/(10kV) regional substations or main step-down substations for industrial enterprises.
Grid-connection transformers for step-up substations in wind and photovoltaic power plants.
Substations requiring connection to compensation devices such as Static Var Generators (SVGs) or synchronous condensers.
Multifunctional hub nodes in urban power grids responsible for voltage transformation and power distribution.

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