Following are he minimum information and Data which to be shown on a transformer nameplate.The standards require the following information and data for transformers rated above 500 kVA
(Suppose 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
Name Plate Rating Of a Transformer
The Data on the Nameplate of transformers contains of kilo-Watts rating, Voltage Rating,Frequency, Number of Phases, Temperature, Type of Cooling, % Impedance and Reactance, Name of Manufacture,Year of Manufacture etc.
A Typica Nameplate of a Transformer as follow.
=================================================================
S.No. Description of Data to be given Ra-marks for example
=================================================================
[1] [2] [3]=================================================================
1. Manufacturer’s Name: ABB/206788
2. Manufacture’s Serial Number 224106
3. Kind of Transformer Power Transformer
4. 236839Relevent Standard Year I.S/P.S/B.S/ IEC /DIS/JIS NEMA
5. Year of Manufacture 2013
6. Number of Phase 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 Raed Current) __________________
13. % Reactance Voltage in % : __________________
14. Types of Cooling ONAM
15 .Total Weight __________Kg
..Mass or insulating Oil __________Kg
..Transportation Weight __________Kg
..Untanking Weight __________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 …………………….
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Hi,<br />Very good blog post I love your site keep up the great posts.
Thanx for appreciation
In some transformers the ratings are having two MVAs …for example- 10/12.5 MVA …can anyone explain me
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!
I agree! thanks for this information.
Thanx for appreciation
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 />
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?
Where is that data???
thanks, can we find efficiency and iron losses in name plate?
Generally, it is not given by nameplate… Read about Transformer Efficiency here<br /><a href="https://www.electricaltechnology.org/2013/12/transformer-efficiency-all-day-efficiency-and-condition-for-maximum-efficiency.html" rel="nofollow"> Transformer Efficiency, All day Efficiency & Condition for Maximum Efficiency<br /></a> <br />
where is insulation level ?
<a href="http://www.runthalaindustries.com/" 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 />
how we get Transformers tolerance
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
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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