HENGFENGYOU ELECTRIC --SMART ELECTRIC GLOBAL SERVICE PROVIDER
Manufacturer
HENGFENGYOU ELECTRIC
Standard on which performance data is based
IEC 60076,GB 1094-1996,GB/ T6451-2008,GB/T 7597-2007
Type
OIL IMMERSED
Method of Cooling
ONAN
Rated Power
5000 KVA
Voltage Ratio
10kv/0.4kv
Frequency
50/60HZ
Tap Changer
5
HV·Tapping
±2.5%;±5%
Vector Group
Dyn11 or Yyn0
Core Material
CRGO Steel
Winding Material
Alumnium or Copper
No Load Losses (GB/T S13 series)
480w
Load Losses (GB/T S13 series)
5150w
Dimensions of Transformer
To accommodate high-current connection requirements, custom enclosure footprints, and diverse environmental conditions, Hengfengyou Electric provides the 5 MVA (5000 kVA) rating in primary specialized configurations:
5 MVA Substation Oil-Immersed Power Transformer: Designed with heavy-duty radiator banks and natural/forced cooling options (ONAN/ONAF). Built specifically for central industrial substations, regional power utility grids, and heavy manufacturing yards.
5 MVA Cast Resin Dry-Type Power Transformer: Flame-retardant, self-extinguishing, and zero-maintenance. Specially suited for indoor commercial towers, underground mining operations, data center rooms, and critical public infrastructure requiring maximum fire safety.
5 MVA Pad-Mounted Substation Transformer: Integrated inside a heavy-gauge, weatherproof, tamper-resistant steel enclosure with integrated high-voltage load switches, protective fuses, and low-voltage busbar connections.
High Electro-Mechanical Short-Circuit Resistance: Constructed with high-density pressboard insulation, radial/axial coil clamping systems, and rigid inner frame bracing to withstand severe short-circuit electromagnetic forces associated with 5 MVA grid capacities.
Low-Loss High-Permeability Core: Built with high-grade, laser-scribed cold-rolled grain-oriented silicon steel lamination sheets featuring step-lap 45-degree mitred joints, minimizing core no-load power dissipation and vibration noise.
Heavy-Current Thermal Management: With a secondary low-voltage current exceeding 7,200 Amperes, internal coil oil ducts and external detachable radiator banks are optimized for efficient heat dissipation, allowing full-load operation even in high ambient temperatures.
Hermetically Sealed or Conservator Construction: Offered in fully sealed corrugated tank designs or traditional oil conservator designs equipped with silica gel breathers and Buchholz protection relays, securing a 25+ year service life.
The direct factory price quote for a 5 MVA (5000 kVA) 10kV/0.4kV oil-immersed power transformer depends on raw material commodity markets, cooling requirements, and custom accessory specifications.
Primary Price Drivers:
Winding Material & Conductor Cross-Section: Pure copper windings require a higher initial material outlay than aluminum options, but provide lower load losses, superior electrical conductivity, and higher mechanical strength under heavy short-circuit stresses.
Cooling System Specification: Standard ONAN (Oil Natural Air Natural) radiator arrays versus ONAF (Oil Natural Air Forced) cooling packages equipped with automated temperature-controlled cooling fans.
Protection & Diagnostic Accessories: Inclusion of multi-contact oil temperature indicators (OTI), winding temperature indicators (WTI), double-float Buchholz relays, pressure relief valves with alarm contacts, and On-Load Tap Changers (OLTC).
Global Commodity Metal Prices: Fluctuations in international prices for electrolytic copper cathode, transformer insulating oil, and CRGO silicon steel.
Request an Instant 5 MVA Power Transformer Price Quote
Q1: What is the standard factory lead time for a 5 MVA power transformer? For standard 10kV/0.4kV 5 MVA (5000 kVA) oil-immersed power transformers, our factory manufacturing schedule is typically 35 to 45 days, including engineering drawing sign-offs, coil winding, core stacking, vacuum oil impregnation, and complete routine factory testing (FAT). Customized designs (e.g., OLTC or special protection gear) require 50 to 60 days.
Q2: What warranty coverage and service plans are provided for a 5 MVA unit? We offer a 12-month standard warranty from the commissioning date (or 18 months from shipment). Extended warranty programs up to 5 years are available for major industrial projects and state utility contracts, backed by direct factory engineering technical support and spare parts availability.
Q3: How does Hengfengyou Electric manage low-voltage heavy current handling for 5 MVA (5000 kVA) 0.4kV outputs? At a rated secondary voltage of 0.4kV, a 5 MVA transformer generates approximately 7,217 Amperes of continuous current. We design custom low-voltage copper busbar extensions, multi-hole heavy-duty spade terminals, and reinforced bushing seals to prevent localized overheating and mechanical tension on the transformer cover.
Q4: How do you calculate the primary and secondary rated currents for a 5 MVA 10kV/0.4kV transformer? For a standard 10kV to 0.4kV step-down voltage transformation:
High-Voltage Side (10 kV): Rated Current I1 = 5000 kVA / (10 kV × 1.732) = 288.68 A
Low-Voltage Side (0.4 kV): Rated Current I2 = 5000 kVA / (0.4 kV × 1.732) = 7,216.88 A
Q5: What are the primary application scenarios for a 5 MVA oil-immersed power transformer? A 5 MVA transformer serves as a primary power distribution hub for large industrial manufacturing complexes, heavy mining sites, regional utility substations, major commercial centers, and utility-scale solar or wind power generation plants. It is standardly configured with a Dyn11 vector group to manage 100% unbalanced neutral loads and attenuate third-harmonic currents effectively.
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