High-Voltage Power Transformers (10 MVA – 63 MVA, up to 220kV) — High-Voltage Power Transformers Manufacturer (10 MVA – 63 MVA, up to 220kV) | XinHuan

Transmission & Substation — 10 MVA to 63 MVA Power Transformers

High-Voltage Power Transformers (10 MVA – 63 MVA, up to 220kV)

XinHuan manufactures high-voltage transmission and primary substation power transformers from 10 MVA to 63 MVA (33kV, 66kV, 110kV, 132kV, and 220kV class). Engineered with vacuum on-load tap changers (OLTC), low-noise step-lap core stacking, high short-circuit electrodynamic withstand, and 100% routine Factory Acceptance Testing (FAT) for national utility grids, generation plants, and heavy industrial substations.

Browse Models Fast Quote
10–63 MVA
capacity range
Up to 220 kV
voltage class
OLTC / OCTC
voltage regulation
IEC 60076
certified

Product Range

High-Voltage Power Transformers (10 MVA – 63 MVA, up to 220kV) — 105 Models Available

Standard and custom capacities available for global utility, industrial, and commercial projects. View complete catalog →

Browse All 105 Models in Catalog

Technical Overview

10 MVA to 63 MVA Primary Substation & Generation Step-Up Transformers

High-voltage power transformers are the critical link between high-voltage bulk transmission networks (220kV, 132kV, 110kV, 66kV) and regional distribution grids (33kV, 11kV). In utility transmission substations, thermal/hydro/solar power plant step-up substations, and heavy industrial plants (steel mills, mining operations, petrochemical complexes), power transformers operate under continuous high load factors and must withstand severe transient overvoltages and external system short circuits.

XinHuan designs and manufactures 10 MVA, 16 MVA, 20 MVA, 25 MVA, 31.5 MVA, 40 MVA, 50 MVA, and 63 MVA power transformers compliant with IEC 60076, IEEE C57, and GB/T 6451 standards. Features include multi-stage step-lap CRGO silicon steel cores to reduce excitation losses, continuous or shielded disc-type electrolytic copper windings with high axial clamping pressure, and vacuum-type On-Load Tap Changers (MR Germany or Huaming) providing ±8×1.25% or ±10×1.5% automatic voltage regulation under load.

Every high-voltage power transformer is subjected to 100% routine FAT in our Hefei high-voltage test bay: winding DC resistance, voltage ratio and vector group verification, short-circuit impedance and load loss (Pk), no-load loss and current (Po / Io), lightning impulse withstand (BIL up to 1050kV), separate-source AC dielectric withstand, and induced overvoltage withstand with partial discharge (PD < 100pC) measurement. Third-party witness testing by SGS, Bureau Veritas, or Intertek is supported.

High-Voltage Power Transformers (10 MVA – 63 MVA, up to 220kV) — Key Specifications

  • Rated Power Capacity

    10 MVA, 16 MVA, 20 MVA, 25 MVA, 31.5 MVA, 40 MVA, 50 MVA, 63 MVA (custom up to 100 MVA)

  • High Voltage (HV) Ratings

    33 kV, 35 kV, 66 kV, 69 kV, 110 kV, 115 kV, 132 kV, 138 kV, 220 kV, 230 kV

  • Low Voltage (LV) Ratings

    6.3 kV, 10.5 kV, 11 kV, 13.8 kV, 22 kV, 33 kV, 34.5 kV, 35 kV

  • Cooling Classes

    ONAN / ONAF (Oil Natural Air Forced), OFAF, or ODAF with dual-speed low-noise cooling fans

  • Voltage Regulation

    Vacuum On-Load Tap Changer (OLTC, MR or Huaming) ±8×1.25% or Off-Circuit (OCTC) ±2×2.5%

  • Vector Groups

    YNd11, YNyn0+d, Dyn11, YNd1, YN0d11 (specified per substation single-line diagram)

  • Partial Discharge Level

    < 100 pC at 1.5 Um/√3 (tested in shielded HV test laboratory)

  • Applicable Standards

    IEC 60076-1 to -5, IEEE C57.12.00, GB/T 1094, GB/T 6451

IEC / IEEE Reference Data

High-Voltage Power Transformers (10 MVA – 63 MVA, up to 220kV) — Standard Capacity & Loss Parameters

Request Custom Datasheet
High-Voltage Power Transformers (10 MVA – 63 MVA, up to 220kV) — Standard Capacity (kVA), No-Load Loss (P0), Load Loss (Pk), Impedance (Uk%), and Weight Specification Table
Rated Capacity Voltage Ratio (HV / LV) No-Load Loss (P0) Load Loss (Pk) Impedance (Uk%) No-Load Current (I0%) Approx. Total Weight
10 MVA 33/11 kV 33 / 11 kV 7.8 kW 52.0 kW 8.0% 0.30% 21,500 kg
16 MVA 33/11 kV 33 / 11 kV 11.2 kW 74.0 kW 8.0% 0.25% 29,800 kg
20 MVA 33/11 kV 33 / 11 kV 13.5 kW 88.0 kW 8.0% 0.25% 34,200 kg
25 MVA 66/11 kV 66 / 11 kV 16.8 kW 105.0 kW 9.0% 0.22% 42,000 kg
31.5 MVA 66/33 kV 66 / 33 kV 19.5 kW 125.0 kW 10.0% 0.20% 49,500 kg
20 MVA 110/11 kV 110 / 11 kV 15.2 kW 95.0 kW 10.5% 0.22% 38,500 kg
25 MVA 110/33 kV 110 / 33 kV 18.4 kW 112.0 kW 10.5% 0.20% 46,000 kg
31.5 MVA 110/33 kV 110 / 33 kV 21.5 kW 132.0 kW 10.5% 0.18% 54,000 kg
40 MVA 110/33 kV 110 / 33 kV 26.0 kW 160.0 kW 11.0% 0.16% 65,000 kg
50 MVA 110/33 kV 110 / 33 kV 31.0 kW 195.0 kW 11.5% 0.15% 78,000 kg
63 MVA 110/33 kV 110 / 33 kV 37.5 kW 235.0 kW 12.0% 0.15% 92,000 kg
50 MVA 220/33 kV 220 / 33 kV 36.0 kW 210.0 kW 14.0% 0.15% 96,000 kg
63 MVA 220/33 kV 220 / 33 kV 43.0 kW 255.0 kW 14.0% 0.14% 115,000 kg

Guaranteed parameters based on standard factory testing. Custom loss levels (Tier-2 Ecodesign, DOE 2016, and high-efficiency low-noise designs) are engineered on request.

High-Voltage Power Transformers (10 MVA – 63 MVA, up to 220kV) — 3D Engineering Anatomy Cutaway

High-precision 3D component breakdown of High-Voltage Power Transformers (10 MVA – 63 MVA, up to 220kV) illustrating CRGO silicon steel core assembly, electrolytic copper windings, insulation, and protection accessories.

High-Voltage Power Transformers (10 MVA – 63 MVA, up to 220kV) internal 3D cutaway showing silicon steel core, copper windings, and tap changer
High-Voltage Power Transformers (10 MVA – 63 MVA, up to 220kV) — Internal Core, Winding & Dielectric Assembly
High-Grade Silicon Core
Electrolytic Copper Coil
Off-Circuit / OLTC Tap Switch
Buchholz & Temp Relays

High-Voltage Power Transformers (10 MVA – 63 MVA, up to 220kV) — Factory Acceptance Testing (FAT)

Watch routine factory testing and quality control inspections inside XinHuan's manufacturing facility.

100% full routine tests (IEC 60076) conducted before export packing.

Engineering Submittal & Layout Workbench

Substation Room Fit & Multi-Equipment CAD Footprints

Select your equipment type and capacity to inspect verified GA engineering CAD line drawings, Single Line Diagrams (SLD), dimensions (L × W × H), roller gauge, and submittal clearances before procurement.

Available Ratings:
IEC 60076-1 Submittal Specs
XinHuan Engineering GA CAD Drawing
XinHuan Engineering Single Line Diagram (SLD)
11kV / 33kV Dual Voltage
IEC 60076 / IEEE Compliant
100% Routine Factory Tested
Export Nitrogen / Seaworthy Pack

1000 kVA Technical Dimensions

IEC 60076-1

International utility & industrial submittal specifications

Overall Length (L) 1,750 mm
Overall Width (W) 1,120 mm
Overall Height (H) 1,780 mm
Roller Wheel Track Gauge (D) 820 mm
Total Equipment Net Weight 3,820 kg
Min Substation Clearance 1,000 mm surrounding
Rated Voltage / System 11 kV / 33 kV Dual Primary
Applicable Standard IEC 60076-1 / IEEE C57
Download Technical Data Sheet (PDF) Request Factory Engineering Submittal Package

Full CAD DXF/DWG vector footprints, 3D STEP models, and custom project submittals provided within 2 hours upon request.

Quality & Compliance

Certified B2B Manufacturing & Laboratory Performance

Every transformer, compact substation, and switchgear unit is engineered under audited ISO quality management systems and type-tested according to IEC 60076 and ANSI C57 international standards.

IAF / CNAS Accredited

ISO 9001:2015 Quality System

Certified Quality Management System covering design, coil winding, vacuum drying, oil filling, and routine testing of 10kV–35kV distribution transformers.

Environmental System

ISO 14001:2015 Environmental

Environmental Management System certifying low-loss eco-designed core assemblies, zero PCB insulation oil, and environmentally safe production controls.

Occupational Health

ISO 45001:2018 Safety System

Occupational Health and Safety Management System ensuring safety containment in high-voltage testing bays and factory assembly protocols.

CNAS Lab Type Tests

IEC 60076 & GB Type Tests

Complete routine and type test records (temperature rise, impulse voltage withstand, short-circuit withstand) conducted at CNAS-accredited national research institutes.

SGS Audited Supplier

SGS Verified Manufacturer Audit

On-site factory audit certificate by SGS / Made-in-China, verifying manufacturing premises, export capacity, assembly lines, and legal qualification.

≥180 Units/Yr Export

International Delivery Certificate

Verified annual supply performance and delivery certificate for overseas power grid EPC and industrial infrastructure projects (Mozambique, Nigeria, Kenya, SEA).

Technical Q&A

Frequently Asked Questions — High-Voltage Power Transformers (10 MVA – 63 MVA, up to 220kV)

Distribution transformers typically range from 50 kVA to 2500 kVA and operate at medium voltage (11kV to 33kV) to directly feed end consumers at 400V. Power transformers range from 10 MVA to 63 MVA and above, operating in transmission and primary bulk substations at 66kV, 110kV, 132kV, or 220kV. They operate near 100% full rating and feature On-Load Tap Changers (OLTC) and advanced forced cooling (ONAF/OFAF).

An OLTC allows voltage ratio adjustments without interrupting load power flow. Driven by an automatic voltage regulating relay (AVR), it switches tap positions through vacuum diverter switches across ±8×1.25% or ±10×1.5% range to maintain constant busbar voltage despite fluctuating grid loads.

Standard substation accessory packages include double-float Buchholz relays for gas and oil surge detection, pressure relief devices (PRD) with visual trip flags, magnetic oil level gauges with low/high alarm contacts, multi-channel winding temperature indicators (WTI) and oil temperature indicators (OTI) with PT100/4-20mA outputs, dehydrating breathers, and optional online dissolved gas analysis (DGA) monitoring.

Per IEC 60076-3, all XinHuan high-voltage power transformers undergo induced overvoltage testing with partial discharge (PD) monitoring in our shielded high-voltage test laboratory. We guarantee partial discharge levels below 100 pC at 1.5 Um/√3, ensuring decades of dielectric insulation integrity without premature degradation.

Large power transformers are drained of oil and shipped with dry nitrogen (N2) gas cushion or dry air at positive pressure (0.02–0.03 MPa) with impact recorders fitted to monitor transit shocks. Bushings, radiators, conservator tank, and piping are dismounted and crated separately in seaworthy wooden cases. Heavy units ship via breakbulk or heavy-lift vessels directly to destination ports.

Every unit receives 100% routine FAT with certified test reports: winding resistance, turns ratio, vector group, load loss and impedance, no-load loss and excitation current, lightning impulse withstand, separate-source AC withstand, and induced overvoltage with PD test. KEMA / CEPRI short-circuit withstand type test certificates are available.

Export Markets

Where High-Voltage Power Transformers (10 MVA – 63 MVA, up to 220kV) Are Supplied

🌍

Africa Transmission & Mining

33kV, 66kV, and 132kV power transformers for utility transmission grids, mining substations, and industrial complexes.

Market guide
🌎

Latin America & Solar Step-Up

High-altitude and utility-scale solar PV step-up power transformers for Peru, Chile, and regional grids.

Market guide

Engineering Reference Silo

Transformer Category Pillars & International Standards

China Transformer Manufacturer Export Hub
11kV Distribution Transformers IEC 60076

50–3150 kVA · IEC 60076 S11/S13/S20 hermetically sealed oil-immersed units with P0/Pk loss tables.
33kV Power & Feeder Transformers 170kV BIL

100 kVA–31.5 MVA · 170 kVp BIL lightning impulse & ONAN/ONAF cooling for utility grids.
60Hz ANSI/IEEE C57 Transformers ANSI C57.12

75–3000 kVA · 13.2kV / 13.8kV / 34.5kV DOE 2016 compliant for North & Latin America.
Pad-Mounted Transformers (ANSI) Dead-Front

75–3000 kVA · IEEE C57.12.34 tamper-resistant dead-front loop & radial feed cabinets.
2500 kVA Substation Transformers 2.5 MVA

2.5 MVA heavy industrial oil & cast resin units with Uk=6% short-circuit impedance.
11kV Cast Resin Dry-Type (SCB14) E2/C2/F1

100–3150 kVA · IEC 60076-11 Class F/H epoxy cast resin, E2/C2/F1 fire-safe, <5 pC PD.
Turnkey Compact Substations IEC 62271

100–3150 kVA · IEC 62271-202 prefabricated YBM European kiosk with MV RMU & LV panels.
Medical IT Isolation Transformers <150μA IT

3.15–100 kVA · IEC 60601-1 & IEC 61558-2-15 <150μA leakage for hospital operating rooms.
Harmonic K-Factor Transformers K-13 / K-20

50–2500 kVA · UL 1562 K-4 / K-13 / K-20 with 200% double neutral for data centers & VFDs.
Engineering Link Magnets & CAD Resources:
DWG / CAD Outline Drawings 1MVA & 2MVA Dry-Type Spec Sheet 10kV SCB13 Low-Loss Guide Solar & Wind Step-Up Units Short-Circuit & CFM Calculator P0/Pk Loss & TCO Calculator

High-Voltage Power Transformers (10 MVA – 63 MVA, up to 220kV) — Direct Factory Quotation

Request Engineering Submittals & Price

Include capacity (kVA), rated MVA, HV/LV voltage ratio (e.g. 110kV/33kV), vector group, OLTC requirement, cooling class (ONAN/ONAF), destination port, and required quantity. Our engineers respond with certified data sheets within 24 hours.

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