220kV Power Transformer
Extra-high-voltage power transformer for main transmission networks and large generation step-up. Built to IEC 60076 / IEEE C57 standards, with OLTC and full type test support.
Technical Parameters
Standard parameter ranges for this model. Special requirements can be assessed by our engineering team — contact us for custom specifications.
| Parameter | Standard Range |
|---|---|
| Rated capacity | 31.5–400 MVA (typical: 120/150/180/240/300/370 MVA) |
| Primary voltage | 220 kV (max 252 kV) |
| Secondary voltage | 35 / 66 / 110 kV / custom |
| Frequency | 50 Hz or 60 Hz |
| Phase | 3-phase (single-phase bank on request) |
| Vector group | YNd11, YNa0, YNd1 (custom available) |
| Impedance | 12% – 16% (per spec & system fault level) |
| Cooling method | ONAN / ONAF / ODAF / OFAF |
| Tap changer | On-load (OLTC) ±8×1.25% — neutral or line-end |
| Insulation level | LI950AC395 (220kV) / per voltage class |
| Temperature rise | 65K (oil); 65K (winding, F class) |
| No-load loss | Per IEC 60076 / customer spec |
| Load loss | Per IEC 60076 / customer spec |
| Noise level | Per IEC 60076-10 (typically ≤75 dB) |
| Protection level | IP00 (indoor substation); IP54 outdoor enclosure available |
| Applicable standards | IEC 60076, IEEE C57.12.00, GB/T 6451 |
| Ambient temperature | -25°C to +40°C (higher temp with derating) |
| Altitude | ≤1000m (derating above, per project) |
| Accessories | OLTC, Buchholz, pressure relay, online DGA, oil/winding temp, surge arrester, control & protection cubicle |
Product Advantages
Verifiable benefits — not empty claims. Here’s exactly what you get when you choose JINXING.
Full Type Test Support
Impulse, PD, temp-rise, sound level — witnessed per capability. Type test reports on file.
3–5 Day Custom Proposal
Large units quoted per project. Engineering assessment within 3–5 working days.
Heavy-Duty Design
Winding & clamping designed for high system fault level. Short-circuit strength per IEC 60076-5.
Complete English Docs
Specification, GA drawing, test report, nameplate, operation manual — all in English.
Third-Party Witness
FAT with SGS/CiT/Intertek welcome. Online DGA and temp monitoring included.
OEM Support
OEM branding available. Built to customer drawings and specifications.
OLTC + Monitoring
On-load tap changer with online DGA, oil/winding temperature, and OLTC monitoring.
Heavy Export Packing
Sea-worthy, shock-fixed for large-unit ocean shipping.
Applications
Where this transformer is used — connecting the product to real-world industry applications.
Transmission Network
Main transmission substations — 220kV step-down to 110/66/35kV.
Generation Step-up
Large generator step-up (GSU) — 220kV connection to grid.
Heavy Industry
Steel, cement, chemical plants — main power supply at 220kV.
Regional Hub Substation
Regional grid interconnection and hub substations.
Grid Interconnection
Interconnection between regional grids at 220kV level.
Oil & Gas
Large processing facilities requiring 220kV main supply.
Quality Proof — 9-Step Manufacturing Process
Every transformer passes through 9 quality-controlled stages, from raw material to shipping. Full traceability with documentation at every step.
Material Inspection
Raw material verification — core steel, copper, oil, accessories checked against certificates before production.
Core Cutting
CNC step-lap core cutting for low-loss grain-oriented silicon steel. Core loss measured before assembly.
Winding
Controlled winding tension, turn-count verification, and insulation paper application for each coil.
Assembly
Core-coil assembly with dimensional checks for fit, clearance, and clamping force.
Vacuum Drying
High-vacuum drying ovens remove moisture from insulation before oil impregnation.
Oil Filling
Filtered insulating oil with breakdown voltage >70kV/2.5mm and moisture <10ppm.
Final Testing
Full routine test per IEC 60076-1 — insulation, resistance, ratio, losses, withstand.
Packing
Sea-worthy export packing with shock-fixed crating for ocean shipping.
Shipping
On-time delivery with documentation — test reports, drawings, manuals in English.
Need a Custom Transformer Solution?
Our engineering team can assess non-standard voltage, capacity, impedance, or environmental conditions — and deliver a full proposal within 48 hours.