Transformers (Power Distribution Transformers)
MOBY Power Distribution Transformers are engineered for optimal electrical efficiency, low no-load losses, and superior thermal withstand capacity. Available in capacities from 100 kVA up to 2000 kVA, in both oil-immersed ONAN and Cast Resin Dry-Type designs, our transformers utilize prime-grade Cold Rolled Grain Oriented (CRGO) silicon steel cores and electrolytic copper/aluminium windings to ensure 30+ years of dependable power delivery.
Comprehensive Technical Specifications
Detailed parameter ratings, insulation limits, standards compliance, and fabrication tolerances engineered for Transformers (Power Distribution Transformers).
| Technical Parameter | Engineering Specification | Compliance Standard / Condition |
|---|---|---|
| 🔷 Electrical & Rating Parameters | ||
| Rated Power Capacity | 100, 160, 250, 315, 400, 500, 630, 750, 1000, 1250, 1600, 2000 kVA | Standard Ratings |
| Primary High Voltage (HV) | 6.6 kV / 11 kV / 22 kV / 33 kV | IS 2026 / IEC 60076 |
| Secondary Low Voltage (LV) | 415 V / 433 V AC (Phase-to-Phase), 250 V (Phase-to-Neutral) | Standard 3-Phase 4-Wire |
| Rated Frequency | 50 Hz ± 3% | National Grid Standard |
| Number of Phases / Vector Group | 3-Phase, Dyn11 (Delta High Voltage / Star Low Voltage with Neutral) | Standard Vector Group |
| Percentage Impedance (%Z) | 4.5% to 5.0% for <= 630 kVA / 5.0% to 6.25% for > 630 kVA | IS 1180 |
| Energy Loss Compliance | BEE Star Labeling / IS 1180 (Part-1) Energy Consumption Levels 1, 2, or 3 | Maximum Efficiency |
| 🔷 Core, Winding & Insulation System | ||
| Core Material | High-permeability low-loss Cold Rolled Grain Oriented (CRGO) M4 / MOH silicon steel | Mitred Joint Core |
| Winding Conductor | Electrolytic Grade ETP Copper (99.9% conductivity) or EC Grade Aluminium with Nomex / Kraft paper insulation | IS 613 / IS 5082 |
| Insulating Fluid (Oil Type) | Inhibited / Uninhibited Transformer Mineral Oil conforming to IS 335 / IEC 60296 | Dielectric BDV > 60kV |
| Dry Type Insulation (Dry Type) | Class F (155°C) or Class H (180°C) Vacuum Pressure Impregnated (VPI) / Cast Resin | Non-Flammable |
| Tap Changer Mechanism | Off-Circuit Tap Switch (OCTC) ± 5% in 2.5% steps or On-Load Tap Changer (OLTC) with RTCC panel | Voltage Regulation |
| 🔷 Standard Fittings & Protective Accessories | ||
| Gas / Oil Surge Protection | Double-float Buchholz Relay with Alarm & Trip contacts (for ratings >= 1000 kVA) | IS 3637 |
| Pressure Relief Device | Spring-loaded Pressure Relief Valve (PRD) with visual indicator & trip switch | Prevents Tank Rupture |
| Temperature Monitoring | Dial-type Oil Temperature Indicator (OTI) & Winding Temperature Indicator (WTI) with microswitches | With Max Pointer |
| Oil Level Indication | Magnetic Oil Level Gauge (MOG) with low oil level electrical alarm contact | Direct Sight Glass |
| Breather Unit | Silica Gel Dehydrating Breather with oil seal to eliminate ambient moisture intake | Maintains Oil BDV |
| Terminations | Cable End Box (HV/LV) or Outdoor Glazed Porcelain Bushings | Flexible Connection |
Key Engineering & Operational Features
Why electrical consultants, industrial plants, and utility engineers specify MOBY Transformers (Power Distribution Transformers).
Ultra-Low Losses (IS 1180 Compliant)
Step-lap mitered core construction with prime CRGO silicon steel minimizes no-load core hysteresis and eddy-current losses, delivering peak energy efficiency.
Superior Short-Circuit Withstand
Rigidly clamped disc and helical winding construction engineered and verified to withstand mechanical forces of symmetrical and asymmetrical external short-circuits.
Automated On-Load Tap Changing (OLTC)
Optional motorized OLTC with Remote Tap Changer Control (RTCC) and Automatic Voltage Regulating (AVR) maintains constant 415V secondary voltage despite grid fluctuations.
Zero Fire Risk (Dry Cast Resin Option)
Cast resin transformers encapsulated in epoxy under high vacuum are completely flame-retardant, self-extinguishing, and non-polluting—ideal for indoor hospital and high-rise basements.
Corrosion-Proof Hermetic Tank
Transformer tanks are fabricated from heavy-gauge mild steel, shot-blasted to SA 2.5, and coated with epoxy-polyurethane paint to survive harsh coastal and tropical weathering.
Comprehensive Safety Instrumentation
Equipped with Buchholz relays, magnetic oil gauges, pressure relief valves, and dual-contact temperature controllers wired to trip upstream VCBs immediately upon fault.
Certified Quality & Factory Testing Standards
Every Transformers (Power Distribution Transformers) is manufactured under strict ISO 9001:2008 quality control protocols and subjected to comprehensive routine testing at our Kolkata facility before dispatch.
Target Industrial Sectors & Deployment Scenarios
Engineered and tested for severe continuous operational duty across diverse sectors:
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Frequently Asked Questions
Authoritative engineering answers regarding voltage ratings, CPRI testing, custom SLD fabrication, and warranty for Transformers (Power Distribution Transformers).
What are the technical voltage and breaking ratings for MOBY Transformers (Power Distribution Transformers)? +
Primary Parameter Ratings: MOBY Transformers (Power Distribution Transformers) is engineered for rated voltage 100 kVA to 2000 kVA and rated normal current 11 kV / 22 kV / 33 kV. It is built to withstand prospective short-circuit breaking currents up to 40 kA for 3 seconds, fully adhering to national and international power engineering guidelines.
Is MOBY Transformers (Power Distribution Transformers) CPRI tested and certified? +
Certification & Type Testing: Yes, MOBY Transformers (Power Distribution Transformers) is IS 2026 / IS 1180 (Part-1) & IEC 60076. All switchgears undergo comprehensive type-testing at the Central Power Research Institute (CPRI) and are routine tested (high-voltage dielectric withstand, contact resistance, and operational timing) at our ISO 9001:2008 certified Kolkata manufacturing facility prior to customer dispatch.
Can this equipment be customized according to our single-line diagram (SLD)? +
Custom Engineering Capabilities: Yes, Moby Electrotech specializes in custom-engineered electrical switchgear systems. Our Kolkata engineering team customizes incoming/outgoing feeder arrangements, CT/PT ratios, numerical protection relays, busbar ratings, enclosure dimensions, and ingress protection (IP42 to IP55) to match your exact site layout and SLD.
What is the standard warranty and quotation timeline for Transformers (Power Distribution Transformers)? +
Commercial Terms & Warranty: All MOBY equipment carries an engineering equipment warranty of 12 months from commissioning or 18 months from delivery. Technical commercial quotations are typically provided within 24 to 48 hours following single-line diagram (SLD) review.
Request Technical Quote for Transformers (Power Distribution Transformers)
Our senior electrical engineering team will review your single-line diagram (SLD), system voltage, and breaking requirements to provide a competitive quotation within 24 hours.