name plates
- Thread starter Mzwakhe
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Here's some good transformer info . http://www.powertransformer.us/
rcarroll
Senior Member
- Location
- Fort Collins, Colorado
I'm not quite sure what you're asking, but, 430.7 for motors & 450.11 for transformers has code requirements for nameplates. '05 NEC. I hope this helps.
zog
Senior Member
- Location
- Charlotte, NC
OK, look at the pic attached, here is what that all means.
Top The manufacturer (optional) and the name of the equipment, in simplified terms
KVA Kilovolt-ampere ratings are based on the type of cooling class and the desired temperature rise.
Class OA: Oil-Immersed, self-cooled
Cont. Rise 55/65 oC are two ratings at which the transformer can operate continuously. The higher the temperature allowed, the higher the rating. It should be noted that a high ambient temperature rise on hot days could shorten transformer life.
HV 24,900. The primary line-to-line nominal voltage
LV 480Y / 277. The secondary Wye connection voltage, line-to-line / line-to-neutral (single phase).
% IZ 5.7% impedance voltage at 75 oC
MFG DATE Manufacturing date
BIL Basic Impulse Level of windings.
HV/LV AL/AL. The conductors are aluminum.
CONDUCT
NOTES The note section in this transformer declares that PCB contamination is less than one (1) parts per million (PPM).
APPR. Weights are critically important when installing, moving, or
WEIGHTS un-tanking the transformer.
TAP This box shows the no-load tap changer positions A - E for the line (high voltage) input to the transformer. 24,940 is in the center (C).
MAX AMPS Based on 840KVA. Varies inversely with the voltage setting of the tap.
DIAGRAMS The diagrams show (1) connection scheme, (2) angular displacement, and (3) physical bushing arrangement as viewed from the top.
Hope this helps
Top The manufacturer (optional) and the name of the equipment, in simplified terms
KVA Kilovolt-ampere ratings are based on the type of cooling class and the desired temperature rise.
Class OA: Oil-Immersed, self-cooled
Cont. Rise 55/65 oC are two ratings at which the transformer can operate continuously. The higher the temperature allowed, the higher the rating. It should be noted that a high ambient temperature rise on hot days could shorten transformer life.
HV 24,900. The primary line-to-line nominal voltage
LV 480Y / 277. The secondary Wye connection voltage, line-to-line / line-to-neutral (single phase).
% IZ 5.7% impedance voltage at 75 oC
MFG DATE Manufacturing date
BIL Basic Impulse Level of windings.
HV/LV AL/AL. The conductors are aluminum.
CONDUCT
NOTES The note section in this transformer declares that PCB contamination is less than one (1) parts per million (PPM).
APPR. Weights are critically important when installing, moving, or
WEIGHTS un-tanking the transformer.
TAP This box shows the no-load tap changer positions A - E for the line (high voltage) input to the transformer. 24,940 is in the center (C).
MAX AMPS Based on 840KVA. Varies inversely with the voltage setting of the tap.
DIAGRAMS The diagrams show (1) connection scheme, (2) angular displacement, and (3) physical bushing arrangement as viewed from the top.
Hope this helps
mivey
Senior Member
You may also find these notes about power transformer notation useful:
Symbol -- Example -- Explanation
E -- 12470 -- Δ connection on E volt system
E/E1Y -- 7200/12470Y -- Δ connection on E volt system or Y connection on E1 volt system
E/E1GrdY -- 7200/12470GrdY -- Reduced insulation for Y connection on E1 volt system with transformer neutral effectively grounded or for Δ connection on E volt system.
E1GrdY/E -- 12470GrdY/7200 -- Reduced insulation at the neutral end. The neutral may be connected directly to the tank for connecting single phase or in Y on an E1 volt system with the neutral end of the winding effectively grounded.
E/2E -- 120/240 -- Winding for multiple, series, or 3-wire service
2E/E -- 240/120 -- Winding for 2E volts, 2-wire full kVA, or for 2E/E volts 3-wire service with 1/2 kVA available from mid-point to each outside terminal
"Ex2E -- 1st ex:240x480 2nd ex:2400/4160Yx4800/8320Y -- Winding for multiple or series operation only (not for 3-wire service)"
Symbol -- Example -- Explanation
E -- 12470 -- Δ connection on E volt system
E/E1Y -- 7200/12470Y -- Δ connection on E volt system or Y connection on E1 volt system
E/E1GrdY -- 7200/12470GrdY -- Reduced insulation for Y connection on E1 volt system with transformer neutral effectively grounded or for Δ connection on E volt system.
E1GrdY/E -- 12470GrdY/7200 -- Reduced insulation at the neutral end. The neutral may be connected directly to the tank for connecting single phase or in Y on an E1 volt system with the neutral end of the winding effectively grounded.
E/2E -- 120/240 -- Winding for multiple, series, or 3-wire service
2E/E -- 240/120 -- Winding for 2E volts, 2-wire full kVA, or for 2E/E volts 3-wire service with 1/2 kVA available from mid-point to each outside terminal
"Ex2E -- 1st ex:240x480 2nd ex:2400/4160Yx4800/8320Y -- Winding for multiple or series operation only (not for 3-wire service)"
megloff11x
Senior Member
NEC 430 says what the nameplate should have. I think someone should make a copy and send it to EVERYONE who makes motors as I have yet to see a motor with all the information required actually provided on the nameplate.
We got in some foreign made widget with foreign motors, and rather than try and puzzle through their specs and figure out what would happen if we ran it through a transformer to get the right Voltage and possibly a VFD to get the right frequency, we just chucked it and made them buy a domestic motor of the same approximate HP as this was cheaper than trying to make the one that came with it run like it was supposed to.
Matt
We got in some foreign made widget with foreign motors, and rather than try and puzzle through their specs and figure out what would happen if we ran it through a transformer to get the right Voltage and possibly a VFD to get the right frequency, we just chucked it and made them buy a domestic motor of the same approximate HP as this was cheaper than trying to make the one that came with it run like it was supposed to.
Matt
shwazqrt
Member
Motor Nameplate Data
Motor Nameplate Data
Ammm,
Mzwakhe I found what you are looking for (PDF File) :grin: :
http://www.pdhonline.org/courses/e156/e156content.pdf
Motor Nameplate Data
Ammm,
Mzwakhe I found what you are looking for (PDF File) :grin: :
http://www.pdhonline.org/courses/e156/e156content.pdf
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