Oil Cooled Distribution Transformer with OLTC – Power Star image image

Oil Cooled Distribution Transformer with OLTC(Distribution Transformer with On Load Tap Changer)

RANGE : Upto 10 MVA in 11, 22, 33 & 66 KV Class.


Power Star covers a wide range of Oil Filled Distribution Transformers with On Load Tap Changer (up to 10000 KVA in 11 KV & 33 KV Class) conforming to the international standards of quality and safety. These transformers are designed and developed using latest technologies and can be provided with a variety of terminations so as to suit the requirements for new installation or replacement.

Optimum efficiency is ensured by delicate proportioning of core and winding looses using CRGO M3 to M5 MOH Lamination, Electrolytic Grade 99.9% pure copper, with Transposition in L.V. coil for current sharing in parallel Conductors, Electric grade press paper, boards and mineral oil. Thus better regulation is achieved resulting in longer life. Careful designing also reduces noise level to the minimum.

Standard Specifications

Capacity Up to 10 MVA
No. of Phases 3 Phase
Frequency 50 Hz.
Voltage Range 11 KV / 22 KV / 33 KV / 66KV
Tapping +5% to -15% Taps on H.T. Side in steps of 1.25% each.
Insulation Class ‘A’
Vector Group Dyn 11
Duty Cycle Continuous
Winding Copper Wound
Terminals As per required

Standard Fittings

Rating & Diagram plate Earthing terminals
Lifting lugs Thermometer pocket
Oil Conservator with drain plug Air release hole with plug
Oil Level indicator Explosion vent with diaphragm
Top-filter Valve Inspection cover.
Silica gel breather Drain –cum-bottom-filter valve
Cooling radiators Uni / Bi- directional rollers

Optional Features

Buchholz relay with alarm and trip contact Magnetic oil level gauge with alarm contact
Pressure Release Valve Marshalling box to house O.T.I. and W.T.I
Cable Box on H.T. Side Cable Box on L.T. Side.
Oil Temp. Indicator with alarm & trip contact RTCC (Remote Tap Changer Control) Cubicle
Winding Temp. indicator with alarm & trip contact Electronic Automatic Voltage Controller

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