Dry-Type Cast Resin Transformers — Fireproof Power for Plazas & Hospitals
Engineered with Class F (155°C) & Class H (180°C) epoxy encapsulation, TransfoLine dry-type transformers deliver 100% oil-free, non-explosive power for commercial basements, shopping malls, and mission-critical facilities across Pakistan.
Zero oil hazard. Zero fire propagation.
TransfoLine dry-type cast resin transformers conform to strict building safety regulations and IEC 60076-11 standards.
Standard ratings & technical matrix.
Standard Cast Resin Transformer Capacities (50 kVA to 5,000 kVA)
TransfoLine engineers and supplies dry-type cast resin units for standard 11kV/415V and custom 33kV distribution networks:
| Rating (kVA) | Voltage Ratio | Cooling Type | Insulation Class | Typical Application |
|---|---|---|---|---|
| 100 kVA – 250 kVA | 11kV / 415V | AN (Natural Air) | Class F (155°C) | Bank branches, retail clinics, boutique hotels |
| 400 kVA – 800 kVA | 11kV / 415V | AN / AF (Forced) | Class F / H | Commercial plazas, educational towers, corporate HQ |
| 1,000 kVA – 2,000 kVA | 11kV / 415V | AN / AF (+40%) | Class H (180°C) | Shopping malls, central hospitals, data centers |
| 2,500 kVA – 5,000 kVA | 11kV / 33kV / 415V | AF Enclosed | Class H (180°C) | Airport terminals, mega mixed-use developments |
From load calculation to commissioned substation.
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01
Day 0
MEP Review & Basement Layout
Our electrical engineers inspect architectural drawings, ambient ventilation, and load schedules to calculate exact kVA and IP rating requirements.
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02
Day 1–2
Custom Engineering & Submittals
Detailed technical submittal sheets, PT100 sensor schematics, dimensional clearance layouts, and factory-direct wholesale pricing.
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03
Delivery
Basement Rigging & Enclosure Setup
Precision indoor positioning, IP21/IP23 enclosure assembly, HT/LT cable terminations, and earthing busbar bonding.
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04
Energized
Dielectric & NDT Pre-Commissioning
Full insulation resistance (Megger), winding resistance, and high-potential proof testing prior to DISCO energization with 1-year full warranty.
Dry-type transformer engineering FAQ.
Answers to common questions regarding Cast Resin CRT transformers, fire regulations, and maintenance in Pakistan.
SAFETY Why are dry-type transformers mandatory for basement substations?
Unlike oil-immersed units, cast resin dry-type transformers contain no combustible mineral oil. Under extreme thermal overload or external flame, the solid epoxy resin does not produce explosive gases, complying with municipal fire safety codes.
COOLING How does Forced Air (AF) cooling increase transformer capacity?
Cross-flow cooling fans mounted at the base of the coils force air through internal ventilation ducts, allowing the transformer to carry up to 40% additional load continuously during peak building hours without overheating.
MAINTENANCE What routine maintenance is required for cast resin units?
Maintenance is minimal: periodic visual inspections, vacuuming surface dust from cooling ducts during planned shutdowns, and verifying PT100 temperature controller calibration.
WARRANTY What warranty does TransfoLine provide on dry-type transformers?
Every TransfoLine dry-type transformer includes a comprehensive 12-month replacement warranty backed by our 24/7 engineering emergency response team.
Cast Resin Engineering Knowledge Hub
Explore in-depth technical guides written by our senior high-voltage design engineers.
Need a Fire-Safe Dry-Type Transformer?
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