WAPDA DDS-84 & IEC 60076 · 11kV/415V 50Hz · Dyn11

400 kVA Transformer in Pakistan — Price, Specs & Turnkey Supply

Q: What is the full load current of a 400 kVA transformer?

At standard 415V three-phase line-to-line voltage, a 400 kVA transformer delivers 556.5 Amperes of full load current: 400,000 / (1.732 × 415) = 556.5 A. On the 11,000V (11 kV) primary side, the rated current is 21.0 Amperes.

Q: What main circuit breaker should be used with a 400 kVA transformer?

A 630A or 800A circuit breaker is required. In standard industrial setups, a 630A MCCB is sufficient, while in continuous heavy duty plants, an 800A Air Circuit Breaker (ACB) with microprocessor-based protection (LSIG: Long, Short, Instantaneous, Ground) is recommended.

Q: Can a 400 kVA transformer be installed on poles?

No. At nearly 2 metric tons (1,980 kg) in weight and requiring significant oil containment in case of rupture, WAPDA and DISCO safety standards strictly mandate outdoor ground plinth installation for 400 kVA units.

Q: What size PFI capacitor bank is required for a 400 kVA transformer?

A 125 kVAR to 150 kVAR automatic Power Factor Improvement (PFI) plant equipped with heavy-duty 440V/480V metalized polypropylene capacitors and micro-gap contactors is required to maintain plant power factor above 0.95.

The 400 kVA distribution transformer is an industrial-grade powerhouse engineered for heavy manufacturing factories, pharmaceutical packaging complexes, large cold storage warehouses (5,000+ tons), commercial hospital annexes, and dedicated feeder installations in Pakistan. Delivering 556.5 Amperes of low-voltage full-load continuous current at 415V three-phase, this unit handles heavy inductive loads, variable frequency drives (VFDs), and continuous 24/7 industrial shifts with maximum efficiency.

Rated LV Current 556.5 A

Rated HV Current 21.0 A

Full Load Efficiency 98.6%

Impedance (%Z) 4.5%

Request 400 kVA Quote & Specs → 📞 Call Substation Engineer: 0300 6919113 View Technical Datasheet ↓

400 kVA Unit Blueprint TL-400KVA-DDS84

✓ Pure Copper Windings: 99.99% conductivity, tested to withstand 50°C summer heat.

✓ Low Loss Standards: 780 Watts iron loss, 4,600 Watts copper loss at 75°C.

✓ DISCO Approval Guarantee: LESCO, FESCO, GEPCO, IESCO, MEPCO, KE inspection compliant.

Immediate Feeder Dispatch Ready 18-Month Warranty

Commercial Transparency

400 kVA Transformer Price in Pakistan — Key Cost Factors

Commercial pricing for a 400 kVA 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:

⚡

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.

🛢️

Dielectric Oil vs. Dry-Type

Standard mineral oil-immersed (ONAN) with 620 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.

🔄

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.

🏷️

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.

400 kVA Commercial Summary

The commercial cost of a 400 kVA transformer in Pakistan depends on whether the windings are configured with 99.99% prime electrolytic copper or commercial EC aluminium, whether the core uses laser-scribed low-loss M4 silicon steel, and the inclusion of protection accessories (Buchholz relay, magnetic oil gauge, temperature indicators with electrical trip contacts). Certified reconditioned units provide plant owners with 40% to 50% capital savings while passing all DISCO high-voltage laboratory tests.

Get Customized Feeder Quote →

Engineering Datasheet

400 kVA 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	400 kVA (320 kW (at 0.8 PF))	Continuous maximum rating at 50°C ambient temperature
Primary High Voltage (HV)	11,000 Volts (11 kV)	3-Phase, 3-Wire delta configuration
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)	556.5 A	Continuous full load current at 415V secondary
Rated Primary Current (HV)	21.0 A	Continuous full load current on 11 kV grid side
System Frequency	50 Hz ±5%	WAPDA / NTDC National Grid synchronized
Vector Group	Dyn11	Delta HV / Star LV with 30° phase lag neutral
Cooling Designation	ONAN (Oil Natural Air Natural)	Thermosiphon circulation through radiator panels
Percentage Impedance (%Z)	4.5%	Guaranteed within ±10% IEC tolerance at 75°C reference
No-Load Losses (Iron Losses)	780 Watts	Measured at rated voltage and frequency (CRGO core)
Full-Load Losses (Copper Losses)	4,600 Watts	Measured at rated current at 75°C reference temperature
Transformer Mineral Oil Volume	620 Liters	Uninhibited Class-I mineral oil (BDV > 50 kV fresh)
Total Weight (with Oil & Fittings)	1,980 kg	Active copper winding weight: 480 kg
Overall Physical Dimensions	1,560 mm (L) × 1,080 mm (W) × 1,720 mm (H)	Overall clearance footprint including radiators and conservator
Recommended HT Drop-Out Fuse Link	30A / 40A Drop-Out Cutout Fuse Link	11kV overhead cutout fuse link coordination
Recommended LT Main Circuit Breaker	630A / 800A Molded Case (MCCB) or Air Circuit Breaker (ACB)	Thermal-magnetic or electronic trip unit coordination
Recommended Low Voltage Cabling	2 Runs of 3.5 Core 185mm² or Single Core 400mm² Cu / XLPE	Sized for <2.5% voltage drop at full load run
Civil Foundation Mounting	Reinforced Concrete Foundation Plinth with Oil Sump	Due to the 1,980 kg overall weight and 556A current, DISCOs (LESCO, FESCO, GEPCO, IESCO, MEPCO, KE) require a ground-mounted reinforced concrete plinth with an oil containment gravel pit, safety fencing, and a 630A/800A LT main distribution panel with under-voltage, over-current, and earth-fault protection.

Industrial Applications

Where is a 400 kVA Transformer Deployed in Pakistan?

Real-world application engineering scenarios across Pakistani commercial facilities, textile mills, and agro-industrial clusters:

Supplies massive starting current capacity for 50HP-75HP industrial ammonia and freon refrigeration compressors, evaporative condensers, and air handling units in Okara, Sahiwal, and Sargodha cold chains.

Superior thermal overload withstand capability
Dial type oil thermometer with alarm and trip contacts
Class-I mineral oil tested above 55 kV dielectric breakdown

Stable, low-noise power for sterile packaging, HVAC AHUs, blister machines, reverse osmosis water plants, and cleanroom air handling systems in Islamabad, Hattar, and Lahore industrial zones.

Low core vibration and acoustic noise (<55 dB)
Off-circuit tap regulation ±2.5%, ±5% for voltage stabilization
Complete routine test certificates for regulatory compliance

Heavy-duty continuous industrial cycle for high-tonnage twin-screw extruders, blown film lines, pipe manufacturing extruders, and cooling tower circulating pumps.

High harmonic tolerance against thyristor DC drives and VFDs
18-month warranty on brand-new prime copper units
Turnkey substation civil plinth installation included

Quality Assurance

Testing Protocols & DISCO Grid Energization Approval

Every TransfoLine 400 kVA 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 11,000V to 415V transformation ratio and Dyn11 30-degree phase shift.

Oil Dielectric Breakdown Voltage (BDV) Verified with 2.5mm sphere gap electrode test exceeding 50 kV (brand new units exceed 60 kV).

Separate Source AC Withstand Test HV winding tested at 28 kV AC for 60 seconds; LV winding tested at 3 kV AC for 60 seconds.

DISCO Inspection & NOC Process Turnkey Assistance

Load Sanctioning File Preparation Preparation of single line diagrams (SLD), connected load lists, 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 (<1.0 Ohm) Separate chemical/copper plate grounding pits for transformer tank body and neutral star point.

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

Direct Quotation

Request Official Quotation for 400 kVA Transformer

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

Required Capacity

Preferred Condition / Technology *

Your Name / Representative *

Company / Factory Name *

Phone / WhatsApp *

Project City & DISCO Grid *

Specific Requirements (Turnkey Installation, LT Panels, Cabling)

🔒 Guaranteed Factory Direct Supply · Certified Lab Routine Tests · No Spam

Technical Clarifications

400 kVA Transformer Technical & Procurement FAQ

Direct engineering answers to frequently asked questions about purchasing, installing, and maintaining a 400 kVA transformer in Pakistan:

What is the full load current of a 400 kVA transformer?

At standard 415V three-phase line-to-line voltage, a 400 kVA transformer delivers 556.5 Amperes of full load current: 400,000 / (1.732 × 415) = 556.5 A. On the 11,000V (11 kV) primary side, the rated current is 21.0 Amperes.

What main circuit breaker should be used with a 400 kVA transformer?