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

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

Q: What is the full load current of a 500 kVA transformer in Pakistan?

At standard 415 Volts three-phase, a 500 kVA transformer produces 695.6 Amperes of low-voltage (LV) full load current: 500,000 / (1.732 × 415) = 695.6 A. On the 11 kV primary high-voltage side, the rated current is 26.2 Amperes.

Q: What size main switchgear / breaker is needed for a 500 kVA transformer?

An 800A or 1000A Air Circuit Breaker (ACB) with a microprocessor-based trip unit (providing adjustable long-time, short-time, instantaneous, and ground-fault protection) is the engineering standard for 500 kVA substations.

Q: What are the foundation and space requirements for a 500 kVA transformer?

A 500 kVA transformer weighs approximately 2,420 kg (2.42 tons). It requires a reinforced concrete plinth (minimum 2500 psi concrete) measuring at least 2,200 mm × 1,800 mm × 300 mm deep, surrounded by an oil-soaking gravel containment pit and 2-meter safety chain-link fencing.

Q: What size PFI capacitor bank is required for a 500 kVA transformer?

A 160 kVAR to 200 kVAR automatic Power Factor Improvement (PFI) panel divided into 8 to 12 capacitor steps with detuned harmonic filter reactors is required to keep plant power factor above 0.95 and avoid DISCO low power factor penalties.

The 500 kVA distribution and substation transformer is the quintessential heavy industrial workhorse across Pakistan. Delivering a massive 695.6 Amperes of continuous low-voltage secondary current at 415V three-phase, this unit powers commercial roller flour mills (100 tons/day), beverage bottling and carbonation lines, steel fabrication complexes, medium textile spinning plants, and chemical mixing factories across all industrial estates in Pakistan.

Rated LV Current 695.6 A

Rated HV Current 26.2 A

Full Load Efficiency 98.7%

Impedance (%Z) 4.5% - 5.0%

Request 500 kVA Quote & Specs → 📞 Call Substation Engineer: 0300 6919113 View Technical Datasheet ↓

500 kVA Unit Blueprint TL-500KVA-DDS84

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

✓ Low Loss Standards: 920 Watts iron loss, 5,500 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

500 kVA Transformer Price in Pakistan — Key Cost Factors

Commercial pricing for a 500 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:

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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 780 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.

500 kVA Commercial Summary

A 500 kVA transformer in Pakistan represents a substantial industrial capital investment. Pricing is directly dictated by copper winding weight (over 600 kg of pure electrolytic copper in prime units), high-grade CRGO lamination steel, 780 liters of Class-I mineral oil, and complete factory routine testing under WAPDA DDS-84. Certified reconditioned 500 kVA units from TransfoLine provide industrial clients with substantial savings (40% to 50% lower capital cost) with immediate dispatch and 12-month full replacement warranty.

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Engineering Datasheet

500 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	500 kVA (400 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)	695.6 A	Continuous full load current at 415V secondary
Rated Primary Current (HV)	26.2 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% - 5.0%	Guaranteed within ±10% IEC tolerance at 75°C reference
No-Load Losses (Iron Losses)	920 Watts	Measured at rated voltage and frequency (CRGO core)
Full-Load Losses (Copper Losses)	5,500 Watts	Measured at rated current at 75°C reference temperature
Transformer Mineral Oil Volume	780 Liters	Uninhibited Class-I mineral oil (BDV > 50 kV fresh)
Total Weight (with Oil & Fittings)	2,420 kg	Active copper winding weight: 610 kg
Overall Physical Dimensions	1,700 mm (L) × 1,180 mm (W) × 1,860 mm (H)	Overall clearance footprint including radiators and conservator
Recommended HT Drop-Out Fuse Link	40A Drop-Out Cutout or 11kV Vacuum Circuit Breaker (VCB)	11kV overhead cutout fuse link coordination
Recommended LT Main Circuit Breaker	800A / 1000A Air Circuit Breaker (ACB) with Microprocessor Trip	Thermal-magnetic or electronic trip unit coordination
Recommended Low Voltage Cabling	2 Runs of 3.5 Core 240mm² or Single Core 500mm² Cu / XLPE	Sized for <2.5% voltage drop at full load run
Civil Foundation Mounting	Dedicated Outdoor Substation Compound on Reinforced Plinth	A 500 kVA substation requires a dedicated outdoor or indoor substation room compliant with DISCO B-3 or B-2 tariffs. WAPDA inspection requires a formal 11kV structure with 40A drop-out cutouts, 9kV lightning arrestors, and an 800A or 1000A Air Circuit Breaker (ACB) equipped with overcurrent and earth-fault protection relays.

Industrial Applications

Where is a 500 kVA Transformer Deployed in Pakistan?

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

Supplies high-torque continuous power for multiple 40HP-60HP roller mills, pneumatic suction blowers, grain cleaning screeners, and packaging lines in Rawalpindi, Lahore, Multan, and Faisalabad.

Extreme thermal stamina under 24/7 continuous duty
Heavy-duty radiators ensuring oil temperature rise <50°C
Dual body and neutral earth pits <0.8 Ohm

High reliability power for automated rotary bottle washing, carbonators, ammonia chillers, blow-moulding machines, and automated shrink-wrapping tunnels.

Harmonic mitigation against variable frequency motor drives
Dial thermometer with trip contacts for automated shutdown
18-month comprehensive warranty on new units

Handles fluctuating pulse loads from multiple submerged arc welding machines, overhead gantry cranes, heavy CNC plasma cutting tables, and hydraulic plate bending rolls.

High mechanical bracing against short-circuit forces
Off-circuit tap adjustment (±2.5%, ±5%)
Same-day emergency loaner standby unit availability

Quality Assurance

Testing Protocols & DISCO Grid Energization Approval

Every TransfoLine 500 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

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Technical Clarifications

500 kVA Transformer Technical & Procurement FAQ

Direct engineering answers to frequently asked questions about purchasing, installing, and maintaining a 500 kVA transformer in Pakistan:

What is the full load current of a 500 kVA transformer in Pakistan?

At standard 415 Volts three-phase, a 500 kVA transformer produces 695.6 Amperes of low-voltage (LV) full load current: 500,000 / (1.732 × 415) = 695.6 A. On the 11 kV primary high-voltage side, the rated current is 26.2 Amperes.

What size main switchgear / breaker is needed for a 500 kVA transformer?