usmcmac
New member
- Location
- Metro Indianapolis, IN area
I'm looking for a good source that explains transformer and motor nameplate information- I want to use it as a training tool...
XFMR & Motor Nameplate info explanation
- Thread starter usmcmac
- Start date
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zog
Senior Member
- Location
- Charlotte, NC
A nameplate is supplied with each transformer according to ANSI Standard C57.12.00, Section 9.4. The nameplate provides basic information for the correct connection and loading of the transformer. The following is a brief description of the information found on transformer nameplates:
Understanding and correctly interpreting the transformer nameplate information is essential to the successful operation, maintenance, and testing of the transformer.
The nameplate is typically made of anodized aluminum or stainless steel, etched or embossed in a way that allows the data on the plate to withstand physical or environmental abuse. The attachment is representative of nameplates found on transformers and gives all the important information.
Reading the Nameplate
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.
Understanding and correctly interpreting the transformer nameplate information is essential to the successful operation, maintenance, and testing of the transformer.
The nameplate is typically made of anodized aluminum or stainless steel, etched or embossed in a way that allows the data on the plate to withstand physical or environmental abuse. The attachment is representative of nameplates found on transformers and gives all the important information.
Reading the Nameplate
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.
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