WAPDA DDS-84 & IEC 60076 · HEAVY POWER SUBSTATION EPC

4000 kVA Transformer in Pakistan (4 MVA) — Price, Specs & Turnkey Supply

Q: What is the full load current of a 4000 kVA (4 MVA) transformer?

At standard 415V three-phase line-to-line, a 4000 kVA transformer delivers 5,564.8 Amperes of low-voltage (LV) full load current: 4,000,000 / (1.732 × 415) = 5,564.8 A. On the 11 kV primary high-voltage side, the rated full load current is 210.0 Amperes.

Q: What main switchgear breaker is required for a 4000 kVA transformer?

A 6300A 4-Pole Air Circuit Breaker (ACB) with a microprocessor-based trip unit (providing adjustable LSIG protection: Long-time, Short-time, Instantaneous, Ground-fault) or dual 3200A incomers with bus coupler is specified. Distribution is routed through a copper Busbar Trunking (BBT) system rated at 6300 Amperes.

Q: Can a 4000 kVA transformer be built with On-Load Tap Changer (OLTC)?

Yes. TransfoLine standardly equips 4000 kVA power transformers with high-speed On-Load Tap Changers (OLTC) with 17 tap positions (±10% regulation in 1.25% steps) and Remote Tap Changer Control (RTCC) panels with Automatic Voltage Regulators (AVR) for seamless voltage stability under fluctuating grid feeders.

Q: What size PFI capacitor bank is required for a 4000 kVA substation?

A 1,250 kVAR to 1,500 kVAR automatic Power Factor Improvement (PFI) panel divided into 14 to 20 microprocessor-controlled capacitor steps with 7% detuned harmonic reactors is required to maintain plant power factor above 0.95.

The 4000 kVA (4 MVA) substation transformer is a heavy power generation and industrial distribution benchmark in Pakistan. Delivering a massive 5,564.8 Amperes of low-voltage continuous current at 415V three-phase (or customized step-down to 3.3kV / 6.6kV), this transformer powers large steel induction melting furnaces (10-ton to 15-ton crucible), chemical electrolysis plants, continuous glass melting furnaces, and 4 MW commercial solar export stations across all major industrial parks in Pakistan.

Rated LV Current 5,564.8 A (or custom voltage)

Rated HV Current 210.0 A @ 11kV (17.5 A @ 132kV)

Full Load Efficiency 99.0%

Impedance (%Z) 6.5% - 7.0%

Request 4000 kVA (4 MVA Power Substation) Quote & Specs → 📞 Call Substation Engineer: 0300 6919113 View Technical Datasheet ↓

4000 kVA (4 MVA Power Substation) Unit Blueprint TL-4000KVA-IEC60076

✓ Prime Electrolytic Copper: 3,400 kg active copper with reinforced electrodynamic clamping.

✓ High Dielectric Oil: 4,400 Liters of Class-I mineral oil tested above 60 kV BDV.

✓ Grid Protection Integration: Buchholz relay, PRD, and RTD temperature sensors included.

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Commercial Transparency

4000 kVA Transformer Price in Pakistan (4 MVA Power Substation) — Key Cost Factors

Commercial pricing for a 4000 kVA (4 MVA Power Substation) transformer in Pakistan is dictated by raw engineering commodities and technical configurations rather than an arbitrary sticker price. Here is how your commercial proposal is structured:

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Winding Conductor Purity

Prime 99.99% Electrolytic Copper provides maximum conductivity, lower I²R losses, and longer service life (25-30 years). EC Grade Aluminium windings provide a lower initial cost option for budget-sensitive seasonal agricultural projects.

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Dielectric Oil vs. Dry-Type

Standard mineral oil-immersed (ONAN) with 4,400 Liters of Class-I inhibited oil is optimal for outdoor substations. Cast resin dry-type (AN/AF) is required for indoor commercial basements where fire regulations strictly prohibit oil.

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Tap Changer Mechanism

Standard units include a 5-position Off-Circuit Tap Changer (OCTC: ±2.5%, ±5%) for seasonal grid adjustment. On-Load Tap Changers (OLTC) with automatic voltage regulating relays are available for sensitive manufacturing loads.

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New vs. Certified Overhauled

TransfoLine manufactures brand-new units (with 18-month guarantee) and supplies thoroughly overhauled certified reconditioned units (with 12-month replacement warranty) providing 40% to 50% capital expenditure savings.

4000 kVA (4 MVA Power Substation) Commercial Summary

A 4000 kVA (4 MVA) power transformer represents a major capital expenditure investment for industrial enterprises in Pakistan. Commercial pricing is governed by over 3,400 kg of 99.99% pure electrolytic copper, 4,400 liters of Class-I mineral oil, laser-scribed CRGO core laminations, On-Load Tap Changer (OLTC) integration, and third-party high-voltage laboratory testing under WAPDA DDS-84 and IEC 60076. TransfoLine supplies brand-new units (18-month warranty) and certified reconditioned 4 MVA units (12-month warranty) delivering 40% to 50% capital savings.

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Engineering Datasheet

4000 kVA (4 MVA Power Substation) Technical Specifications (WAPDA DDS-84 & IEC 60076)

Complete electrical, mechanical, and protection coordination data for electrical consulting engineers and DISCO inspection officers:

Technical Parameter	Design Value / Rating	Standard & Engineering Notes
Nominal Power Rating	4000 kVA (4 MVA Power Substation) (3,200 kW (at 0.8 PF))	Continuous maximum rating at 50°C ambient temperature
Primary High Voltage (HV)	11,000 Volts (11 kV) / 33 kV / 132 kV	3-Phase, 3-Wire delta configuration (or customized)
Secondary Low Voltage (LV)	415 Volts (Line-Line) / 240 Volts (Line-Neutral)	3-Phase, 4-Wire star configuration with neutral bushing
Rated Secondary Current (LV)	5,564.8 A (or custom voltage)	Continuous full load current at 415V secondary
Rated Primary Current (HV)	210.0 A @ 11kV (17.5 A @ 132kV)	Continuous full load current on 11 kV grid side
System Frequency	50 Hz ±5%	WAPDA / NTDC National Grid synchronized
Vector Group	Dyn11 / YNd11	Delta HV / Star LV with 30° phase lag neutral
Cooling Designation	ONAN / ONAF / OFWF	Thermosiphon circulation through radiator banks (forced cooling available)
Percentage Impedance (%Z)	6.5% - 7.0%	Guaranteed within ±10% IEC tolerance at 75°C reference
No-Load Losses (Iron Losses)	4,900 Watts	Measured at rated voltage and frequency (CRGO core)
Full-Load Losses (Copper Losses)	33,000 Watts	Measured at rated current at 75°C reference temperature
Transformer Mineral Oil Volume	4,400 Liters	Uninhibited Class-I mineral oil (BDV > 60 kV fresh)
Total Weight (with Oil & Fittings)	12,500 kg (12.5 Tons)	Active copper winding weight: 3,400 kg
Overall Physical Dimensions	3,550 mm (L) × 2,450 mm (W) × 3,300 mm (H)	Overall clearance footprint including radiators and conservator
Recommended HT Protection Switchgear	11kV / 132kV Vacuum or SF6 Circuit Breaker Panel with Differential Relays	11kV Vacuum Circuit Breaker with IDMT and Differential Relays
Recommended LT Main Circuit Breaker	6300A Air Circuit Breaker (ACB) or Dual 3200A Busway Incomers	Microprocessor-based electronic LSIG trip unit coordination
Recommended Low Voltage Cabling / Busway	Copper Busbar Trunking System (BBT) Rated 6300A	Copper Busbar Trunking (BBT) system sized for heavy current
Civil Foundation Mounting	Dedicated Outdoor Substation Compound on Heavy Reinforced Plinth & Oil Sump	A 4000 kVA (4 MVA) substation is classified under DISCO B-3 / B-4 industrial tariff. DISCO regulations (LESCO, FESCO, GEPCO, IESCO, MEPCO, KE) mandate a formal 11kV incoming Vacuum Circuit Breaker (VCB) panel with microprocessor overcurrent, earth-fault, and differential relays, dual copper grounding grids (<0.5 Ohm), safety interlocks, and a 6300A Air Circuit Breaker (ACB).

Industrial Applications

Where is a 4000 kVA (4 MVA Power Substation) Transformer Deployed in Pakistan?

Real-world application engineering scenarios across Pakistani manufacturing complexes, commercial hubs, and industrial zones:

Engineered with reinforced winding clamping to withstand violent electromagnetic stresses, harmonic resonance, and thermal cycling from high-frequency thyristor inverter melting crucibles in Sheikhupura, Lahore, and Hattar.

Available as OFWF water-oil forced cooling or heavy ONAN/ONAF
Buchholz relay, pressure relief device (PRD), and RTD temperature sensors
Heavy-duty radiators ensuring top oil temperature rise <50°C

Supplies stable, continuous power for massive DC rectifiers, membrane cell electrolyzers, hydrogen/chlorine compressors, and heavy refrigeration chillers in Port Qasim and Kala Shah Kaku.

Multi-coat anti-corrosive chemical epoxy paint finish
Dial thermometer with trip contacts for automated emergency shutdown
Class-I inhibited mineral oil tested above 60 kV BDV

Serves as the central step-up substation transformer stepping up 415V/690V solar inverter output to 11kV for DISCO bidirectional net metering (NEPRA B-3/B-4 regulations).

Electrostatic shielding between HV and LV windings
Low impedance voltage regulation under shifting irradiance
Full compliance with NEPRA grid synchronization standards

Quality Assurance

Testing Protocols & DISCO Grid Energization Approval

Every TransfoLine 4000 kVA (4 MVA Power Substation) transformer undergoes stringent factory routine testing before dispatch to ensure 100% first-time approval during DISCO departmental inspection:

Mandatory Routine Tests Lab Certified

Insulation Resistance (Megger Test) Tested at 2500V DC (HV-LV, HV-Earth, LV-Earth) ensuring insulation values exceed 2,000 Mega-Ohms.

Winding DC Resistance Measurement Measured across all primary tap positions and secondary phases using Kelvin bridge for balance verification.

Voltage Ratio & Vector Group Verification Confirming exact transformation ratio and Dyn11/YNd11 phase shift.

Oil Dielectric Breakdown Voltage (BDV) Verified with 2.5mm sphere gap electrode test exceeding 60 kV fresh.

Separate Source AC Withstand Test HV winding tested at 28 kV AC (or 230kV AC for 132kV units) for 60 seconds.

DISCO Inspection & NOC Process Turnkey Assistance

B-3 / B-4 Load Sanctioning File Preparation Preparation of single line diagrams (SLD), protection coordination studies, and tariff change applications.

Substation Civil Pad Inspection Verification of concrete foundation dimensions, gravel oil-sump, and earth pit clearance distances.

Dual Earth Pit Verification (<0.5 Ohm) Separate copper grounding grid for transformer tank body, neutral star point, and lightning arrestors.

Departmental Testing & Meter Sealing Witnessing of testing by DISCO M&T (Metering & Testing) engineers and installation of bidirectional TOD meters.

Direct Quotation

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Specify your factory or substation parameters. Our high-voltage estimation team will calculate your feeder requirements and deliver an itemized quotation within 2 business hours.

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Technical Clarifications

4000 kVA (4 MVA Power Substation) Transformer Technical & Procurement FAQ

Direct engineering answers to frequently asked questions about purchasing, installing, and maintaining a 4000 kVA (4 MVA Power Substation) transformer in Pakistan:

What is the full load current of a 4000 kVA (4 MVA) transformer?

At standard 415V three-phase line-to-line, a 4000 kVA transformer delivers 5,564.8 Amperes of low-voltage (LV) full load current: 4,000,000 / (1.732 × 415) = 5,564.8 A. On the 11 kV primary high-voltage side, the rated full load current is 210.0 Amperes.

What main switchgear breaker is required for a 4000 kVA transformer?