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

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

Q: What is the full load current of an 800 kVA transformer at 415V?

At standard 415V three-phase, an 800 kVA transformer produces 1,113.0 Amperes of low-voltage (LV) full load current: 800,000 / (1.732 × 415) = 1,113.0 A. On the 11 kV primary high-voltage side, the rated full load current is 42.0 Amperes.

Q: What main circuit breaker is required for an 800 kVA transformer?

A 1250A or 1600A Air Circuit Breaker (ACB) with a microprocessor-based trip unit (providing adjustable long-time, short-time, instantaneous, and earth-fault protection) is the engineering standard for 800 kVA substations.

Q: What are the civil pad dimensions for an 800 kVA transformer?

An 800 kVA transformer weighs approximately 3,350 kg (3.35 tons). It requires a reinforced concrete foundation plinth (minimum 2500 psi concrete) measuring at least 2,500 mm × 2,000 mm × 350 mm deep, surrounded by an oil-soak gravel pit and 2-meter safety chain-link fencing.

Q: What size PFI capacitor bank is required for an 800 kVA transformer?

A 250 kVAR to 300 kVAR automatic Power Factor Improvement (PFI) panel equipped with heavy-duty 440V/480V metalized polypropylene capacitors and 7% detuned harmonic reactors is required to maintain plant power factor above 0.95.

The 800 kVA distribution and substation transformer is an industrial power workhorse designed for high-capacity manufacturing plants, continuous plastic compounding facilities, large commercial hypermarkets, and heavy food processing factories in Pakistan. Delivering 1,113.0 Amperes of low-voltage full-load continuous current at 415V three-phase, this transformer powers heavy motive loads and multiple motor control centers (MCCs) with uncompromised voltage stability and thermal stamina.

Rated LV Current 1,113.0 A

Rated HV Current 42.0 A

Full Load Efficiency 98.7%

Impedance (%Z) 5.0%

Request 800 kVA Quote & Specs → 📞 Call Substation Engineer: 0300 6919113 View Technical Datasheet ↓

800 kVA Unit Blueprint TL-800KVA-DDS84

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

✓ Low Loss Standards: 1,300 Watts iron loss, 7,800 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

800 kVA Transformer Price in Pakistan — Key Cost Factors

Commercial pricing for a 800 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 1,150 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.

800 kVA Commercial Summary

An 800 kVA transformer price in Pakistan is governed by active copper winding weight (880 kg of pure 99.99% electrolytic copper), laser-scribed low-loss CRGO silicon steel laminations, and 1,150 liters of Class-I mineral oil. Certified reconditioned units provide plant managers with 40% to 50% capital expenditure savings and same-day emergency dispatch from our regional yards with a 12-month full replacement warranty.

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Engineering Datasheet

800 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	800 kVA (640 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)	1,113.0 A	Continuous full load current at 415V secondary
Rated Primary Current (HV)	42.0 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)	5.0%	Guaranteed within ±10% IEC tolerance at 75°C reference
No-Load Losses (Iron Losses)	1,300 Watts	Measured at rated voltage and frequency (CRGO core)
Full-Load Losses (Copper Losses)	7,800 Watts	Measured at rated current at 75°C reference temperature
Transformer Mineral Oil Volume	1,150 Liters	Uninhibited Class-I mineral oil (BDV > 50 kV fresh)
Total Weight (with Oil & Fittings)	3,350 kg	Active copper winding weight: 880 kg
Overall Physical Dimensions	1,980 mm (L) × 1,350 mm (W) × 2,120 mm (H)	Overall clearance footprint including radiators and conservator
Recommended HT Drop-Out Fuse Link	65A Drop-Out Cutout or 11kV Vacuum Circuit Breaker (VCB)	11kV overhead cutout fuse link coordination
Recommended LT Main Circuit Breaker	1250A / 1600A Air Circuit Breaker (ACB) with LSIG Microprocessor	Thermal-magnetic or electronic trip unit coordination
Recommended Low Voltage Cabling	3 Runs of 3.5 Core 240mm² or 2 Runs of 3.5 Core 400mm² Cu / XLPE	Sized for <2.5% voltage drop at full load run
Civil Foundation Mounting	Dedicated Outdoor Substation Compound on Reinforced Concrete Plinth	A 800 kVA substation requires a dedicated outdoor or indoor substation room compliant with DISCO B-3 or B-2 tariffs. WAPDA inspection mandates 65A drop-out cutouts, 9kV lightning arrestors, dual copper earth pits (<0.8 Ohm), and an 1250A or 1600A Air Circuit Breaker (ACB) with LSIG protection.

Industrial Applications

Where is a 800 kVA Transformer Deployed in Pakistan?

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

Continuous power for multiple high-torque twin-screw compounding extruders, underwater pelletizers, industrial water chillers, and material pneumatic conveying systems in Sundar and Hattar industrial estates.

Harmonic mitigation against high-capacity DC and AC thyristor drives
Dial thermometer with trip contacts for automated motor interlock
18-month comprehensive factory warranty on new copper units

Powers large multi-deck commercial display chillers, blast freezers, centralized rooftop package HVAC units, and warehouse automated lighting in Lahore, Karachi, and Rawalpindi.

High dielectric oil breakdown voltage (>55 kV)
Automatic PFI capacitor bank (300 kVAR)
Separate body and neutral earthing pits (<0.8 Ohm)

Powers heavy corrugator heating rolls, flexographic printing machines, high-volume rotary die cutters, and boiler feed water systems in Gujranwala, Sheikhupura, and Kotri.

Superior dynamic short-circuit mechanical strength
Off-circuit tap changer (OCTC: ±2.5%, ±5%) for grid stabilization
Turnkey substation civil foundation installation included

Quality Assurance

Testing Protocols & DISCO Grid Energization Approval

Every TransfoLine 800 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 (<0.8 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

800 kVA Transformer Technical & Procurement FAQ

Direct engineering answers to frequently asked questions about purchasing, installing, and maintaining a 800 kVA transformer in Pakistan:

What is the full load current of an 800 kVA transformer at 415V?

At standard 415V three-phase, an 800 kVA transformer produces 1,113.0 Amperes of low-voltage (LV) full load current: 800,000 / (1.732 × 415) = 1,113.0 A. On the 11 kV primary high-voltage side, the rated full load current is 42.0 Amperes.

What main circuit breaker is required for an 800 kVA transformer?