HJ-MPT Series HV Power Transformer
Up to 35kV / Up to 31.5MVA / Heavy-Duty Substation Core
The HJ-MPT Series HV Power Transformer is the heavy-duty powerhouse designed for primary substations and major industrial grid interconnects. Engineered to handle massive energy transfers up to 31,500kVA (31.5MVA), this robust oil-immersed transformer delivers exceptional short-circuit withstand capabilities, superior thermal management (ONAN/ONAF), and customizable On-Load Tap Changer (OLTC) options for precise voltage regulation under extreme load conditions.
Ideal for Primary Power Transmission:
- ✓ Utility Step-Down Primary Substations (e.g., 35kV to 10kV)
- ✓ Heavy Metallurgy, Steel Mills & Mining Complexes
- ✓ Large-Scale Renewable Energy (Wind/Solar) Grid Tie-ins
- ✓ Major Industrial Parks & Data Center Power Hubs
1. Exceptional Short-Circuit Withstand Capacity
In large-scale grids, fault currents can be devastating. The HJ-MPT utilizes high-purity oxygen-free copper and an advanced interleaved winding structure with rigid axial and radial compression. This mechanical reinforcement ensures the transformer can effortlessly survive the severe electromechanical forces generated during massive system short circuits.
2. Low-Loss Core & High-Efficiency Operation
Built to minimize long-term OPEX. The magnetic core is precisely stacked using high-permeability, cold-rolled grain-oriented silicon steel sheets with step-lap joints. This advanced magnetic circuit design drastically reduces no-load losses and minimizes acoustic noise, ensuring highly efficient base-load operation.
3. Advanced Thermal Management (ONAN / ONAF)
Engineered for sustained heavy overloading. While base models operate silently with Oil Natural Air Natural (ONAN) cooling, our high-capacity models (10MVA to 31.5MVA) are equipped with high-efficiency radiator banks and automated fan arrays (ONAF). This forced-air cooling engages dynamically during peak demand, safely extending the transformer's thermal limits.
4. Precision Voltage Regulation (OLTC & OCTC)
Maintain grid stability regardless of load fluctuations. The HJ-MPT can be customized with premium On-Load Tap Changers (OLTC) for automated, uninterrupted voltage regulation, or highly reliable Off-Circuit Tap Changers (OCTC) for cost-effective static voltage management.
Global Factory Acceptance & Specialized Logistics
Manufacturing a Power Transformer is a precise science. Every HJ-MPT undergoes rigorous FAT procedures per IEC 60076 standards, including lightning impulse tests, temperature rise simulations, and partial discharge measurements. Due to its massive scale, we provide specialized logistical planning, including impact-monitored shipping and expert on-site supervision for final assembly and oil filling.
Performance Matrix & Technical Specifications
(Note: The matrix below references typical parameters compliant with GB/T 6451 and IEC 60076 for 35kV class. Voltages, impedances, and vector groups are engineered to your local utility's exact single-line diagram.)
| Parameter / Model | HJ-MPT-2500 | HJ-MPT-6300 | HJ-MPT-10000 | HJ-MPT-20000 | HJ-MPT-31500 |
|---|---|---|---|---|---|
| Rated Power (kVA) | 2500 | 6300 | 10000 | 20000 | 31500 |
| Cooling Mode | ONAN | ONAN | ONAF | ONAF | ONAF |
| Impedance (%) | 6.50% | 7.00% | 8.00% | 8.00% | 8.00% |
| No-Load Loss (kW) | 2.9 | 6.2 | 9.6 | 17.7 | 26.3 |
| Load Loss (kW) | 23.5 | 46.2 | 64.0 | 116.0 | 165.0 |
General System Ratings
- Typical Primary Voltage: Up to 35kV (e.g., 33kV, 34.5kV).
- Typical Secondary Voltage: e.g., 10kV, 11kV, 13.8kV.
- Vector Group: Ynd11 / Dyn11 / YNyn0 (Custom engineered).
- Compliance Standards: IEC 60076 / IEEE C57.12.00.
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