245kV 275kV 400kV 330kV Three-Phase Three-Winding On-Load Tap-Changing Autotransformer

Description：

As a pioneer in China's power transformer industry, we have specialized in the R&D and manufacturing of power transformer equipment for decades, and established industry standards with core technologies.

This is a core medium and high-voltage power equipment, featuring a three-winding structure to flexibly match 400kV/330kV and lower voltage levels for efficient power transmission. Its on-load tap-changing function enables voltage adjustment without grid disconnection, ensuring uninterrupted power supply. Adopting high-quality materials and advanced cooling technology, it boasts low loss, strong short-circuit resistance, and meets IEC standards. Equipped with basic monitoring components, it supports convenient operation and maintenance, making it ideal for regional grid interconnection and key power supply projects.

This power transformer is fully compliant with international standards including IEC 60076-1, IEEE C57.12.00, ANSI C57.12.90, AS/NZS 60076.5 and EN 61558-1. It meets quality requirements and is widely adaptable to the operational needs of power grids in multiple overseas regions.

Product Characteristics:

• Reasonable structure based on modern calculation technology, analysis of the electrical, magnetic, force and thermal characteristics of the transformer.

• Advanced performance based on IEC standards, specially designed as customer requirements, obviously lower PD than the value in IEC60076-3.

• High reliability based on the analysis of electrical, magnetic, force and thermal characteristics, reasonable transformer insulation structure, proper ampere turn distribution and the cooling system resulting in high ability of withstanding over-voltage and short-circuit current, no possibility of local overheat.

• Optimal accessories：Superior user experience based on good visual, leak-free, un-tanking, maintenance-free.

Technical Parameters

The voltage classes of some of these Power Transformer include 6kV, 6.3kV, 6.6kV, 6.9kV, 7.2kV, 10kV, 10.5kV, 11kV, 11.5kV, 12kV, 13.2kV, 13.8kV, 14.5kV, 14.4kV, 15kV, 15.5kV, 15.6kV, 17.5kV, 20kV, 21.9kV, 22kV, 24kV, 30kV, 33kV, 33.5kV, 34.5kV, 35kV, 36kV, 38kV, 38.5kV, 40.5kV, 44kV, 45kV, 46kV, 66kV  69kV.72.5kV 88kV 110kV 115kV 123kV 125kV 126kV 132kV 138kV 145kV 150kV 154kV 161kV 170kV  220kV 225kV 230kV 245kV 275kV 330kV 345kV 363kV 380kV 400kV 500kV Power transformers of voltage ，and aboveand customization is available.

330kV 90000kVA~720000kVA Three-phase Double-winding Power Transformer with Off-circuit Tap-changer

Note: Transformers with various special parameters and performance can be manufactured according to customer requirements.

330kV 90000kVA~240000kVA Three-phase Three-winding Power Transformer with Off-circuit Tap-changer

Note:

• The data in the above sheet are applicable to step-up transformer.

• The capacity allocation of the step-up type can also be (100/50/100)%.

• Step-down type transformer can be provided as required, its short circuit impedance: HV-LV 24%~26%, HV-MV14%~15%, MV-LV 8%~9%, and its capacity can be (100/100/50)% or (100/50/100)%.

• .Short circuit impedance in the sheet is based on 100% rated capacity.

• 5Transformers with various special parameters and performance can be manufactured according to customer requirements.

330kV 90000kVA~360000kVA Three-phase Three-winding Autotransformer with Off-circuit Tap-changer (Regulating in Series Winding)

Note:

• The data in the above sheet are applicable to step-down type transformer.

• The step-up type transformer can be provided as required, and its short circuit impedance: HV-LV 10%~11%, HV-MV 24%~26%, MV-LV 12%~14%.

• Short circuit impedance in the sheet is based on 100% rated capacity.

• Transformers with various special parameters and performance can be manufactured according to customer requirements.

330kV 90000kVA~360000kVA Three-phase Three-winding Autotransformer with On-load Tap-changer (Regulating at the End of Series Winding)

Note:

• The data in the above sheet are applicable to step-down type transformer. Step-up type transformer can be provided as required.

• Short circuit impedance in the sheet is the value based on 100% rated capacity.

• Transformers with various special parameters and performance can be manufactured according to customer requirements.

Normal Service Conditions

• Altitude:≤1000m;

• Ambient temperature:Maximum temperature: +40℃;Maximum monthly average temperature: +30℃;Maximum yearly average temperature: +20℃;Minimum temperature: -25℃.

• Power supply: approximate sinusoidal wave, three-phase symmetrical approximately

• Installation site: indoor or outdoor, without the obvious contamination.Note: The transformer used in special conditions should be specified when ordered.