Transformer Nameplate Information

[pwrshl]

Just wondering, what kind of information will you find on a transformer nameplate? I assume ratings, voltages, cooling configurations, but what else? Thanks!

 

[dpc]

Impedance, taps, bushing CTs.

There are ANSI and (I'd assume) IEC standards for transformer nameplates.



David Castor

http://www.cvoes.com

 

[ScottyUK]

Mass or core & windings, mass of oil, overall mass.

See IEC 60076


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If we learn from our mistakes I'm getting a great education!

 

[waross]

Vector diagram.
Basic Impulse Level.
Manufacturer.

Bill
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"Why not the best?"
Jimmy Carter

 

[redfurry]

Try a Google Image Search for "Transformer Nameplate".

It will bring up dozens of examples of real Nameplates so you can see typical details for yourself.

 

[brianle]

See attached nameplate.

 

[farmape]

NEC Article 450 says:
Name of manufacturer; Rated kVA; Frequency; Primary and secondary voltages; Impedance of transformers 25kVA and larger; Required clearances for transformers with ventilation openings; Amount and kind of insulating liquid where used; Temperature class for the insulation system of dry-type transformers.

 

[mastergate]

IEC 60076-1 indicates:
7.1 Information to be given in all cases:
a) Kind of transformer (for example transformer, auto-transformer, booster transformer, etc.).
b) Number of this standard.
c) Manufacturer's name.
d) Manufacturer's serial number.
e) Year of manufacture.
f) Number of phases.
g) Rated power (in kVA or MVA). (For multi-winding transformers, the rated power of each winding should be given. The loading combinations should also be indicated unless the rated power of one of the windings is the sum of the rated powers of the other windings.)
h) Rated frequency (in Hz).
i) Rated voltages (in V or kV) and tapping range.
j) Rated currents (in A or kA).
k) Connection symbol.
l) Short-circuit impedance, measured value in percentage.
m) Type of cooling. (If the transformer has several assigned cooling methods, the respective power values may be expressed as percentages of rated power, for example ONAN/ONAF 70/100 %.)
n) Total mass.
o) Mass of insulating oil.
7.2 Additional information to be given when applicable ... depend on transformer type and accessories

 

[Millbo]

pwrshl
C57.12.00-2000, 5.12.2 Nameplate information. States "...Unless otherwise specified, the minimum information shown on the nameplate shall be..."

Serial number
Month/year of manufacture
Class (ONAN, ONAF, etc.)
Number of phases
Frequency
kVA (or MVA) rating
Voltage ratings
Tap voltages
Temperature rise, ?C
Polarity (single-phase transformers)
Phasor diagram (polyphase transformers)
Percent impedance
Basic lightning impulse insulation levels (BIL)
Approximate masses in kg (pounds)
Connection diagram
Name of manufacturer
Installation and operating instructions reference
The word transformer or autotransformer
Step-up operation suitability
Tank, pressure, and liquid data
Type of insulating liquid (generic name preferred)
Conductor material (of each winding)