II. Product Structure Options for 4 MVA Transformers

To suit varied civil engineering constraints, structural loads, and safety mandates, Hengfengyou Electric provides the 4 MVA capacity in three core heavy-duty configurations:

• 4 MVA Substation-Type Oil-Immersed Power Transformer: Built with heavy-gauge corrugated or radiator cooling banks and reinforced structural tanks. Ideal for outdoor industrial substations, chemical plants, and utility power distribution.

• 4 MVA Epoxy Resin Cast Dry-Type Transformer: Self-extinguishing and environmentally safe with high impulse withstand voltage. Preferred for indoor installations in large commercial towers, underground facilities, and data centers where fire safety is critical.

• 4 MVA Pad-Mounted Transformer Substation: Enclosed in a compact, heavy-duty weatherproof cabinet integrating high-voltage load break switches and protection fuses. Designed for utility parks, commercial plazas, and large residential districts.

III. Core Technical Advantages & Value Proposition

• Low-Loss CRGO Core Engineering: Built using high-magnetic-permeability cold-rolled grain-oriented silicon steel with precision mitred joint stacking, significantly driving down no-load loss and operational acoustic noise.

• High Operational Efficiency & EU Ecodesign Compliance: Operating efficiency exceeds 99%, fully satisfying European Ecodesign Tier 2 standards (2015/2014/548/EC) to ensure reduced lifecycle energy costs (TCO) for large power users.

• Hermetically Sealed Maintenance-Free Tank: The corrugated radiator walls flex to accommodate thermal oil expansion and contraction. This fully sealed tank prevents atmospheric oxidation and moisture ingress, extending insulation lifespan to over 25 years.

• High Short-Circuit Resistance & Overload Capacity: Structural winding bracing provides high mechanical strength against electromagnetic forces during short circuits. Premium copper winding designs safely handle short-term temporary overload spikes up to 150% for up to 2 hours.

IV. Price Factors & Industrial Purchasing Considerations

The direct manufacturer quotation for a 4 MVA 10kV/0.4kV oil-immersed transformer depends on raw material indices and specialized engineering add-ons.

Primary Price Determinants:

• Conductor Material: All-copper windings incur higher initial investment compared to aluminum, but deliver superior mechanical strength under heavy load currents and lower load losses.

• Loss Specifications: Standard energy efficiency configurations versus customized ultra-low loss requirements (such as European Tier 2 standards).

• Protection Accessories & Switchgear Integration: Options including Buchholz gas relays, multi-point dial thermometers, pressure relief devices, and On-Load Tap Changers (OLTC).

• Global Commodity Metal Prices: Daily market fluctuations in electrolytic copper cathode and CRGO silicon steel lamination sheets.

Request an Instant 4 MVA (4000 kVA) Oil-Immersed Transformer Price Quote

V. Frequently Asked Questions (FAQ)

Q1: What is the typical lead time for manufacturing a heavy-duty 4 MVA transformer?
For standard 10kV/0.4kV 4 MVA (4000 kVA) distribution power transformers, our standard production delivery timeframe is 40 to 50 days. Due to the high power rating and structural cooling banks, extra quality inspection and oil-leak testing cycles are conducted. Customized units or models requiring On-Load Tap Changers (OLTC) generally require 60 to 75 days.

Q2: What warranty coverage and extended options are available for this 4 MVA transformer?
We offer a 12-month standard warranty starting from commissioning (or 18 months from bill of lading date). For major industrial projects or utility power contracts, we provide extended warranty options up to 5 years, backed by fast-response engineering consultation and global spare parts supply.

Q3: How does Hengfengyou Electric offer competitive factory pricing for high-capacity 4 MVA transformers?
As a direct manufacturer, we eliminate trading company markups and source raw materials like CRGO steel and copper in high volumes. Our advanced automated winding machines and streamlined tank fabrication allow us to deliver cost-effective solutions without compromising structural integrity or insulation safety.

Q4: How do you calculate the primary and secondary rated currents for a 4 MVA 10kV/0.4kV transformer?
For a 10kV to 0.4kV step-down power transformation:

• High-Voltage Side (10 kV): Rated Current I1 = 4000 kVA / (10 kV × 1.732) = 230.94 A

• Low-Voltage Side (0.4 kV): Rated Current I2 = 4000 kVA / (0.4 kV × 1.732) = 5773.50 A

Q5: What are the primary application scenarios for a 4 MVA power transformer?
With a high low-voltage output current exceeding 5700 Amperes, a 4 MVA transformer is typically deployed in large manufacturing plants, steel mills, mining operations, utility main substations, solar/wind farm step-up stations, and hyperscale data centers. It is usually supplied with a Dyn11 vector group to effectively suppress harmonics and accommodate unbalanced load distributions.