Oil Immersed Distribution Transformer
Oil Immersed Distribution Transformer
Oil Immersed Distribution Transformer

Oil Immersed Distribution Transformer

STANDARD FITTINGS

  • H. V. Bushing

  • L. V. Bushing

  • Off-Circuit Tap Changer

  • Conservator oil filling hole with cap & drain plug

  • Undercarriage with four bi-directional rollers

  • Earthing terminals

  • Drain cum bottom filter valve with sampling plug.

  • Top filter valve with sampling plug

  • Plain Oil Level gauge

  • Rating diagram plate

  • Air release device

  • Thermometer Pocket

  • Lifting lugs

  • Pressed Steel Radiators (Fins or corrugated type)

  • Double Diaphragm Explosion Vent

  • Silica gel breather

  • Additional Neutral bushing

  • First filling of oil

TECHNICAL SPECIFICATIONS

Parameter Specification
Duty, Type Outdoor / Indoor, Pole or Ground Mounted
Voltage Class 3.3, 6.6, 11, 22, 33 kV or any specific
No of Phases 1 or 3 Phase
Frequency 50/60 Hz
Vector Group Dyn1 or Dyn5 or Dyn11 or any specific
Insulating Fluid PCB FREE Mineral Oil, both inhibited & uninhibited, as per IS/IEC, ASTM D3487 and customer requirement
Class of Insulation Class A
Tap Changer Off Circuit or On Load
Tapping Range ±2.5% X 2 for OCTC or + 1.25% X 4 & - 1.25% X 8 for OLTC or as per customer requirement
Winding Material Aluminium or Copper with multi-paper covering
Applicable Standards IS 2026, IEC 60076, ANSI, IEEE
Painting Enamel, Epoxy, Polyurethane or customer-specific

OPTIONAL FITTINGS

  • Detachable Radiators with isolating valves.

  • Jacking Pads

  • Dial-type Oil Temperature Indicator with A/T contacts

  • Dial-type winding temperature indicator with A/T contacts

  • Magnetic Oil Gauge with A/T contacts

  • Buchholz relay with A/T contacts

  • Marshalling box with control wiring

  • Equaliser pipe between conservator & explosion vent

  • On-load tap changer

  • RTCC Panel with automatic voltage Regulator (AVR)

  • Pressure Release valve

  • DGPT Relay

ASSURED FEATURES

  • Highest dielectric insulation property to withstand Lightening Impulse.

  • Mechanical design to withstand short-circuit forces arising during faults.

  • Optimum oven heating under vacuum as to achieve desired compression height and maximum insulation resistance (IR) to windings.

  • Adequate ducts between layers, coils, and discs for maximum oil flow and reduced hot spot temperature.

  • Step-lap designed CRGO laminations for lower losses and excitation current.

  • Pre-compressed insulation material for minimal moisture absorption.

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