Chapter 4 Flashcards
Nameplates
What does a nameplate do?
Describes its technical aspects.
What is the nameplate associated with?
The internals of the transformer
What does a nameplate provide?
Technical information used to safely store, transport, install, maintain, and inventory the unit. It provides information that the utility can track for the life of the transformer.
When do you use a nameplate?
- Prior to installation
- Ensure the desired primary/secondary voltage is chosen
- Ensure that the impedances are within +/-10% if banking or paralleling
- Determine the weight of the transformer for rigging purposes
Where can the nameplate be found on overhead transformers?
On or near the mounting bracket
Where can the nameplate be found on underground transformers?
Inside the door or on the face
What are the subtle differences between transformer nameplates?
The primary and secondary coil voltage ratings are printed in reverse order, and the schematic diagrams are different.
What items printed on nameplates are most useful to lineworkers?
- Voltage Ratings
- Kilovolt-Amperes (kVA)
- Serial Number
- Polarity
- Impedance
- Schematic
What does the Schematic display?
The primary and secondary coils and their relationship.
Why should you always check the nameplate?
To determine the proper voltage before installation
What should you always do before connecting the customer’s load?
Verify the secondary voltage with an approved voltmeter.
What is the Voltage Rating on the nameplate?
The primary coil rating is always the smaller of the two voltages listed.
