Dry type VPI & Cast Resign Transformers
.png)
Dry-Type Distribution Transformer – Technical Specifications
Distribution transformers are vital components in the electrical grid, used to step down high-voltage electricity from transmission lines to lower voltages suitable for commercial, industrial, and residential use. They are designed for high efficiency, safety, and long service life under varying load conditions.
General Specifications
|
Parameter
|
Specification
|
|---|---|
|
Rated Power
|
25 kVA to 3000 kVA
|
|
Primary Voltage (HV)
|
11 kV / 22 kV / 33 kV
|
|
Secondary Voltage (LV)
|
11kV / 6.6kV / 3.6kV / 433 V (3-phase)
|
|
Frequency
|
50 Hz / 60 Hz
|
|
Phase
|
3-Phase (Standard)
|
|
Insulation Class
|
Class F / H
|
|
Cooling Type
|
AN (Air Natural), AF (Air Forced)
|
|
Enclosure Protection
|
IP23 / IP23 / IP34/ IP43 / IP56
|
|
Standards
|
IS 2026 / IS 11171, IEC 60076-11, IEEE C57.12.01
|
.png)
Electrical Characteristics
|
Feature
|
Details
|
|---|---|
|
Efficiency
|
≥ 98.5% (as per BEE/IS energy efficiency levels)
|
|
Impedance
|
Typically, 4% – 8.25%
|
|
Vector Group
|
Dyn11 (standard)
|
|
Tapping Range
|
±10% upto -20% @ 2.5% (Off-circuit Tap Links)
|
|
Losses
|
As per ECBC or Customer Specifications
|
|
Temperature Rise
|
≤ 90°C (winding), ≤ 150°C (hotspot)
|
|
Thermal Class
|
F (155°C) or H (180°C)
|
Protection & Safety Features
|
Feature
|
Function
|
|---|---|
|
Over-temperature Protection
|
Thermistors / PT100 sensors with alarm and trip functions
|
|
Enclosure Options
|
VPI/VPE in IP-rated metal housing
|
|
Self-extinguishing Materials
|
Flame retardant insulation, non-toxic fumes
|
|
Low Noise Levels
|
Complies with IEC/IS sound level requirements
|
|
Seismic & Vibration Resistant
|
Suitable for critical installations (e.g., hospitals, airports)
|
Applications
- Commercial and Residential Buildings
- Hospitals and Data Centers
- High-rise Installations
- Metro & Railway Infrastructure
- Renewable Energy Systems (Indoor Use)
CONNECT WITH VOLTAMP®