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

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

Q: What is the difference between 300 kVA and 315 kVA transformers?

Both ratings are closely related and often used interchangeably by engineers. 315 kVA is the standard Renard R10 international IEC 60076 preferred rating step, delivering 438 Amperes of full load current. 300 kVA is the traditional WAPDA specification step delivering 417.4 Amperes. TransfoLine supplies both ratings compliant with all DISCO networks.

Q: What is the full load current of a 300 kVA transformer at 415V?

At standard 415V three-phase line-to-line, a 300 kVA transformer produces 417.4 Amperes: 300,000 / (1.732 × 415) = 417.4 A. For a 315 kVA unit, the rated current is 438.2 Amperes. The primary 11 kV line current is 15.7 A (16.5 A for 315 kVA).

Q: What size main LT circuit breaker is required for 300 kVA?

A 500A or 630A Molded Case Circuit Breaker (MCCB) with adjustable electronic or thermal-magnetic trip units is standard. This allows safe continuous operation at 417A while accommodating seasonal ambient temperature de-rating.

Q: How large should the PFI capacitor bank be for a 300 kVA transformer?

A 100 kVAR to 125 kVAR automatic Power Factor Improvement (PFI) plant divided into 6 to 8 microprocessor-switched stages is recommended to maintain power factor above 0.95.

The 300 kVA (and standard 315 kVA rating) distribution transformer is the benchmark industrial power platform for textile power loom weaving sheds, corrugated carton packaging factories, medium rice husking mills, and multi-pump agricultural tube well clusters in Pakistan. Delivering 417.4 Amperes (438 Amperes for 315 kVA) of continuous low-voltage secondary current at 415V three-phase, this transformer handles heavy continuous inductive loads with exceptional thermal resilience.

Rated LV Current 417.4 A (438 A for 315 kVA)

Rated HV Current 15.7 A (16.5 A for 315 kVA)

Full Load Efficiency 98.5%

Impedance (%Z) 4.0% - 4.5%

Request 300 kVA (also 315 kVA standard) Quote & Specs → 📞 Call Substation Engineer: 0300 6919113 View Technical Datasheet ↓

300 kVA (also 315 kVA standard) Unit Blueprint TL-300KVA-DDS84

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

✓ Low Loss Standards: 620 Watts iron loss, 3,700 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

300 kVA (also 315 kVA standard) Transformer Price in Pakistan — Key Cost Factors

Commercial pricing for a 300 kVA (also 315 kVA standard) 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 480 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.

300 kVA (also 315 kVA standard) Commercial Summary

Pricing for a 300 kVA or 315 kVA transformer in Pakistan reflects raw material commodity indices (London Metal Exchange copper rates), dielectric mineral oil grade, and manufacturing tolerances under WAPDA DDS-84. Factory new units feature prime electrolytically refined copper and laser-scribed CRGO steel. For expanding factories seeking rapid project payback, certified reconditioned units deliver 40% to 50% cost savings with zero compromise on DISCO compliance.

Get Customized Feeder Quote →

Engineering Datasheet

300 kVA (also 315 kVA standard) 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	300 kVA (also 315 kVA standard) (240 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)	417.4 A (438 A for 315 kVA)	Continuous full load current at 415V secondary
Rated Primary Current (HV)	15.7 A (16.5 A for 315 kVA)	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)	4.0% - 4.5%	Guaranteed within ±10% IEC tolerance at 75°C reference
No-Load Losses (Iron Losses)	620 Watts	Measured at rated voltage and frequency (CRGO core)
Full-Load Losses (Copper Losses)	3,700 Watts	Measured at rated current at 75°C reference temperature
Transformer Mineral Oil Volume	480 Liters	Uninhibited Class-I mineral oil (BDV > 50 kV fresh)
Total Weight (with Oil & Fittings)	1,550 kg	Active copper winding weight: 390 kg
Overall Physical Dimensions	1,420 mm (L) × 960 mm (W) × 1,580 mm (H)	Overall clearance footprint including radiators and conservator
Recommended HT Drop-Out Fuse Link	25A Drop-Out Cutout Fuse Link	11kV overhead cutout fuse link coordination
Recommended LT Main Circuit Breaker	500A / 630A Molded Case Circuit Breaker (MCCB)	Thermal-magnetic or electronic trip unit coordination
Recommended Low Voltage Cabling	Single Core 300mm² or 2 × (3.5 Core 150mm²) Cu / XLPE	Sized for <2.5% voltage drop at full load run
Civil Foundation Mounting	Outdoor Concrete Civil Plinth with Oil Retention Pit	A 300 kVA substation requires ground-level civil foundation construction with oil-soak gravel pits. Electrical inspectors from LESCO, FESCO, GEPCO, IESCO, or MEPCO mandate a dedicated 630A LT switchgear panel with overcurrent and earth-fault protection relays.

Industrial Applications

Where is a 300 kVA (also 315 kVA standard) Transformer Deployed in Pakistan?

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

Powers 16 to 24 high-speed shuttleless or air-jet weaving looms, warp sizing machines, humidification plant blowers, and compressor units across Faisalabad, Gujranwala, and Multan textile hubs.

Resistant to ambient airborne cotton dust and humidity
Heavy-duty radiators for maximum heat dissipation
Integrated oil level gauge and dial thermometer

Continuous power for 3-ply and 5-ply corrugated board production lines, rotary die cutters, flexo printing units, and heavy industrial boiler pumps in Sundar and Kot Lakhpat industrial estates.

Low harmonic vulnerability
Rapid off-circuit tap selector for feeder stabilization
Automatic trip signaling contacts

High starting torque support for large commercial grain elevators, de-huskers, color sorters, and high-volume pneumatic aspiration fans in Kamoke, Muridke, and Hafizabad rice belts.

Withstands high motor starting inrush currents
Tested dielectric oil breakdown (>55 kV)
18-month warranty on prime copper windings

Quality Assurance

Testing Protocols & DISCO Grid Energization Approval

Every TransfoLine 300 kVA (also 315 kVA standard) 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 300 kVA (also 315 kVA standard) 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

300 kVA (also 315 kVA standard) Transformer Technical & Procurement FAQ

Direct engineering answers to frequently asked questions about purchasing, installing, and maintaining a 300 kVA (also 315 kVA standard) transformer in Pakistan:

What is the difference between 300 kVA and 315 kVA transformers?

Both ratings are closely related and often used interchangeably by engineers. 315 kVA is the standard Renard R10 international IEC 60076 preferred rating step, delivering 438 Amperes of full load current. 300 kVA is the traditional WAPDA specification step delivering 417.4 Amperes. TransfoLine supplies both ratings compliant with all DISCO networks.

What is the full load current of a 300 kVA transformer at 415V?