Transformer

Transformer Nameplate Data – Explain the Rating and Features

General Requirements of a Transformer Nameplate to Show the Characteristics

Following are the minimum information and data printed on a transformer nameplate from the designer and manufactures. The standards require the following information and data for transformers rated above 500 kVA (and 1000kVA = 1MVA.

  • Name of manufacturer
  • Serial number
  • year of manufacture
  • Number of phases
  • kVA or MVA rating
  • Frequency
  • Voltage ratings.
  • Tap voltages.
  • Connection diagram.
  • Cooling class
  • Rated temperature in °C
  • Polarity (for Single Phase Transformers)
  • Phasor or vector diagram (For Polyphase or Three Phase Transformers)
  • % impedance.
  • Approximate mass or weight of the transformer
  • Type of insulating liquid.
  • Conductor material of each winding.
  • Oil volume (of each transformer Container/Compartment)
  • Instruction for Installation and Operation

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Nameplate Rating Of a Transformer

The data on the Nameplate of a transformer contains of kVA rating, Voltage Rating, Frequency, Number of Phases, Temperature, Type of Cooling, % Impedance and Reactance,  Name of Manufacture, Year of Manufacture etc.

A Typical Nameplate of a Transformer as follows.

S.No. Description of Data to be given Ra-marks for example
1  Manufacturer’s Name: ABB/206788
2  Manufacture’s Serial Number 224106
3  Kind of Transformer Power Transformer
4  Relevant Standard Year I.S/P.S/B.S/ IEC /DIS/JIS NEMA
5  Year of Manufacture 20….
6  Number of Phase                                                     3 3
7  Rated Power 1000kVA  = 1MVA
8 Rated Frequency: 50Hz
9 Rated Voltages: HV  33 kV,  LV 11 kV,
10 Rated Currents HV______,LV_______.
11 Vector Group Symbol __________________
12 % Impedance Voltage

.. ( At Rated Current)

 

__________________

13 % Reactance Voltage  in  % : __________________
14 Types of Cooling ONAN
15 Total Weight

.. Mass or insulating Oil

.. Transportation Weight

.. Untanking Weight

__________Kg

__________Kg

__________Kg

__________Kg

16 Insulating liquid ( if Not Oil) Types: __________
17 Quantity of Oil ( Liters): __________
18 Details about Tap-Changer __________
19 Rated  insulation Level:

.. Power-Frequency withstand Voltage

__________

kV(rms)

20 Other …………………….

Also shown in below image.

General Transformer Nameplate Data Rating

Below is a 100kVA (Three-Phase) Transformer nameplate.

Click image to enlarge.

How to Size a Transformer - Calculate the Rating of Transformer

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19 Comments

  1. This comment has been removed by a blog administrator.

  2. Vibration Switch says:

    Hi,<br />Very good blog post I love your site keep up the great posts.

    1. Electrical Technology says:

      Thanx for appreciation

      1. In some transformers the ratings are having two MVAs …for example- 10/12.5 MVA …can anyone explain me

        1. If the transformer has two type of cooling method, for example ONAN/ONAF , those ratings are at each conditions!! that is first in first cooling method and second in second cooling method!

  3. I agree! thanks for this information.

    1. Electrical Technology says:

      Thanx for appreciation

  4. Anonymous says:

    Hi, On some plates we can see Y/delta ikons with triangle. Would you explain me, pls, what is that dash-line inside of triangle sign for?<br />Thanks<br />

  5. Tipu Sultan says:

    DDS-84-2007 ?<br />What is that notation?<br />Is that a standard in which transformer built or some type of manufacturing number or date in which the transformer is built?

    1. Electrical Technology says:

      Where is that data???

  6. andi abdul rahman says:

    thanks, can we find efficiency and iron losses in name plate?

  7. Anonymous says:

    where is insulation level ?

  8. Runthala Jaipur says:

    <a href="http://www.runthalaindustries.com/&quot; rel="nofollow">Electrical transformer manufacturers</a> provides different content notation on name plate. This blog provides standard name plate notification of the transformer thanks for sharing imaging information about name plate. <br /> <br />

  9. nagabhushana says:

    how we get Transformers tolerance

  10. Zeeshan Sohail says:

    40 MVA transformer also called 20 26 ( May be Size or some else, i don’t know ) Can anyone told me that what is 20 26? i mentioned a cell no in the comment for text messaging or What’s app .. +92-306-6287879

  11. MR. VINIT MHATRE says:

    DEAR SIR / MADAM,
    WE DO LASER ENGRAVING ON FIBRE, BACKLITE SS.PLATE ALUMIINUM, WOOD N ALSO NAME PLATE WHICH R PUT ON TRANSFORMER, PANEL ALL TYPES OF ANDOISE PLATES R DONE IN CHEAPEST RATES .
    WAITING FOR YOUR RELAY CALL US OR PLEASE SENT US THE MAIL WE WILL VISIT YOUR OFFICE.N DELIVERY IS ALSO GIVEN BY US BY COURIER, OR BY HAND NO EXTRA CHARGES WILL BE TAKEN.
    9892060085/7738535085(MR. MHATRE)
    FROM SUNITA ENGRAVING.
    THANE

  12. Dear sir/madam,
    I have a 34.5kV ,100KVA distribution transformer with 5 taps .The nameplate has the following as the primary voltage : 34.5+/-2×2.5% kV.what does this mean
    Kweku

  13. PRABHAKAR says:

    Metering to be done at 33KV HT line side and for 5MVA transformer maximum current is 90A therefore provided CT ampere ratio is very high please clarify…?

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