The following technical
Specification is provided by the Manufacturer of transformer.
- Name of Manufacturer
- Service
- HV winding ( kVA )
- IV ( Intermediate voltage ) winding ( kVA )
- LV winding ( kVA )
- HV winding ( kV )
- IV ( Intermediate voltage ) winding ( kV )
- LV winding ( kV )
- Rated frequency
- Number of phases
- HV winding
- IV winding
- LV winding
- High voltage – Intermediate voltage
- High voltage – Low voltage
- Range
- Number of steps
- High voltage / Intermediate voltage / Low voltage variations
- Maximum ambient temperature ( oC )
- Maximum daily average ambient air temperature ( oC )
- Maximum yearly weighted average ambient temperature ( oC )
- Minimum ambient air temperature ( oC )
- Maximum cooling water temperature ( oC )
- Type of cooling
- Top oil ( oC )
- Windings ( oC )
- Component loss
- No load loss at rated voltage on principal tapping and at rated frequency ( kW )
- Load loss at rated current at principal tapping at 75 oC ( kW )
- Impedance voltage at rated current for the principal tapping
- HV – IV ( Percent )
- HV – LV ( Percent )
- IV – LV ( Percent )
- HV – IV ( Percent )
- HV – LV ( Percent )
- IV – LV ( Percent )
- No load current at rated voltage and rated frequency ( Percent )
- Input to cooling plant ( kW )
- Insulation level
( a ) Separate source
power frequency voltage withstand
- HV winding ( kV RMS )
- IV winding ( kV RMS )
- LV winding ( kV RMS )
( b ) Induced over
voltage withstand
- HV winding ( kV RMS )
- IV winding ( kV RMS )
- LV winding ( kV RMS )
( c ) Full wave
lighting impulse withstand voltage
- HV winding ( kV Peak )
- IV winding ( kV Peak )
- LV winding ( kV Peak )
( d ) Switching impulse
withstand voltage
- HV winding ( kV Peak )
- IV winding ( kV Peak )
- LV winding ( kV Peak )
Stabilizing / Tertiary winding
- Rated voltage ( kV )
- Normal rating ( kVA )
- Normal rating ( Expressed as percent of main winding rating in case of stabilizing winding )
- Delta closed inside / outside ( In case of stabilizing winding )
- At full load ( Percent )
- At 3/4th full load ( Percent )
- At 1/2th full load ( Percent )
- At unity power factor ( Percent )
- At 0.8 power factor lagging ( Percent )
State : Radiator on main bank / Separate cooler bank
State : OFAN /
ODAN, ONAF, ONAN rating ( kVA ) whichever is / are applicable in case of mixed
cooling
- OFAN / ODAN
- ONAF
- ONAN
- Number of coolers / cooler banks per transformer
- Rating of each cooler / cooler bank
- OFF circuit voltage variation in case of
- Off circuit tap switch
- Off circuit links
- Make
- Rating
- Rated voltage
- Rated current
- Step voltage
- Number of steps
- Control
- Auxiliary supply details
- Voltage control
- Parallel operation
- Protective devices
- Approximate overall weight ( kg )
- Approximate overall dimensions ( mm )
- Approximate overall quantity of oil ( Litre )
- High voltage
- Intermediate voltage
- Low voltage
- Neutral
- Core and windings ( kg )
- Tank , fittings and accessories ( kg )
- Oil ( kg )
- Total mass ( kg )
- Approximate quantity of oil required for first filling ( Litres )
- Length ( mm )
- Breath ( mm )
- Height ( mm )
Despatch details
- Approximate mass of heaviest package ( kg )
- Approximate dimensions of largest package
- Length ( mm )
- Breath ( mm )
- Height ( mm )
- Untanking height ( mm )
- Reference standards
The following fittings should be provided.
- Inspection cover ( Above 1600 kVA )
- Rating plate
- Terminal marking plate
- Two earthing terminals
- Lifting lugs
- Drain valve with plug / cover plate ( 25 kVA and above )
- Dehydrating breather ( 25 kVA and above for rated voltage 11 kV and below, and all ratings above 11 kV )
- Oil level indicator with minimum
- Marking
- Thermometer pocket
- Oil filling hole with cover
- Conservator ( 50 kVA and above for rated voltage 11 kV and below, and all ratings above 11 kV )
- Air release valve ( All transformers which is fitted with conservators )
- Jacking lugs ( Above 1600 kVA )
- Filter valve ( Above 1600 kVA )
The following types of additional fittings are provided if ordered.
- Filter valves ( 1600 kVA and below )
- Rollers ( If stated in the enquiry / order )
- Thermometer ( If stated in the enquiry / order )
- Additional thermometer pockets ( If stated in the enquiry / order )
- Winding temperature indicator ( If stated in the enquiry / order )
- Explosion vent ( Details to be stated )
- Gas and oil actuated relay ( type to be stated )
- Skids
- Inspection cover ( 1600 kVA and below )
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