Industry News

110kV Transformer SZ10 Series Three-Winding On-Load Tap Changer Power Transformer

12-18 2025 | By:

Product Overview

The SZ10 Series 110kV Three-winding on-load tap changer (OLTC) power transformer is designed for high-reliability transmission and distribution systems. It is widely used in European power grids, industrial substations, renewable energy integration projects, and utility infrastructure upgrades.

With advanced core design, low-loss winding structure, and a proven OLTC system, the SZ10 series ensures stable voltage regulation, high efficiency, and long service life, fully meeting modern grid operation requirements.

Key Features of SZ10 Series 110kV Transformers

On-Load Voltage Regulation (OLTC)
Allows voltage adjustment under load conditions, ensuring grid stability and continuous operation without power interruption.
Low Loss & High Efficiency Design
Optimized magnetic core and conductor layout significantly reduce no-load loss and load loss, helping utilities comply with European energy efficiency standards.
Robust Electrical & Mechanical Performance
Designed to withstand short-circuit forces, thermal stress, and long-term continuous operation.
High Reliability for Utility Applications
Suitable for 24/7 operation in transmission and substation environments.
Compliance with International Standards
Manufactured according to IEC 60076, with optional customization to meet specific EU or utility technical specifications.

Typical Applications

110kV transmission and distribution substations
Urban and regional power grid networks
Industrial power supply systems
Wind and solar power grid connection substations
Power infrastructure modernization projects

110kV Transformer S10 Series Three-Winding Off-Frequency Voltage Regulating Power Transformer Product Technical Parameters

Model	Voltage combination and tap range(kV)			Vector Group	No-load loss(kW)	Load loss(kW)	No-load current(%)	Impedance voltage（%）		Transport weight(t)	gross weight(t)	External dimensions: Length x Width x Height (mm)
Model	High pressure	Medium pressure	Low pressure	Vector Group	No-load loss(kW)	Load loss(kW)	No-load current(%)	step-up transformer	step-down transformer	Transport weight(t)	gross weight(t)	External dimensions: Length x Width x Height (mm)
SFS10-6300/110	110 115 121± 2×2.5%	35 36.6 38.5± 2×2.5%	6.3 6.6 10.5 11	YN, yn0, d11	8.4	45.1	0.4	High-Medium 17.5% High-Low 10.5% Medium-low 6.5%	High-Medium 10.5% High-Low 17.5% Medium-low 6.5%	20.2	23.3	4950x3320x3610
SFS10-8000/110					10.1	53.6	0.4			23.1	26.2	4970x3360x3640
SFS10-10000/110					11.9	62.9	0.3			25.9	29.6	5020x3410x3690
SFS10-12500/110					14	74	0.3			31.5	35.3	5080x3430x3740
SFS10-16000/110					16.9	90.1	0.3			33.6	37.8	5140x3490x3780
SFS10-20000/110					20.0	106.3	0.25			39.3	44.6	5300x3670x4200
SFS10-25000/110					23.6	125.8	0.25			44.5	51.0	6106x4877x4941
SFS10-31500/110					28	148.8	0.2			50.0	57.0	6430x4420x5060
SFS10-40000/110					33.5	178.5	0.2			55.4	64.2	6600x4570x5160
SFS10-50000/110					39.6	212.5	0.1			65	76	6910x4620x5280
SFS10-63000/110					46.9	255	0.1			79	88.3	7330x4860x5800
SFS10-75000/110					53.5	290.6	0.1			83	92	7800x4990x6100

Design Advantages for European Power Systems

The SZ10 series is engineered to match European grid operation characteristics, focusing on:

High voltage stability under fluctuating loads
Compatibility with renewable energy sources
Reduced operating and maintenance costs
Long inspection and maintenance intervals

The OLTC system ensures precise voltage control, especially important for urban distribution networks and renewable energy substations, where load variations are frequent.