You are almost correct. The taps on the high voltage side did not provide the proper turns ratio to convert 240v to something under 480v. The lowest was 511.
What I did was pull out one winding and tap into it with a split bolt.
I now get 476 volts, it seems to work nicely. I may be losing a little bit of kVA, but I do not care.
i
You are in violation of the MFG's published data for this xfmr, and the NEC. Sure it will work until the insulation system breaks down. Below would be the proper application and solve prior post issues.
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e-Catalog*> Transformers > Dry Type Vented >General Purpose;Phase:3;PriVoltage:240;SecVoltage:480Y/277;KVA:45;Coil Material:AL;TempRise:150
Transformers,Dry Type Vented
Product #: 9T83B3053
Short Description: AL 3P 45KVA 240-480Y/277
SPECIFICATIONS
Category General Purpose
Phase 3
PriVoltage 240
SecVoltage 480Y/277
KVA 45 KVA
Coil Material AL
TempRise 150 ?C
ElecShield N
SubType VENTED
Frequency 60 Hz
UL Yes
Impedance 5.8 %
FrameSize EE73
cUL No
CE No
Width 23.8 in
Depth 18.4 in
Height 32.2 in
TempClass 220 ?C
AmbTemp 40 ?C
InsulSys IS-19C
Taps (+2,-4 2.4%)
GSA Compliance No
GO Schedule 67A
List Price $8179
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9T83B3053
Additional Resources for General Purpose
Application and Technical
Brochures
Catalogs and Buyers Guides
Data Sheets
Drawings-Outline and Dimensional
Installation and Instruction
Material Safety Data Sheets
2004 CSI Master Format
1995 CSI Master Format
GE Type QL transformers meet NEMA TP-1 efficiency standards. They are available with aluminum or copper windings and utilize a UL recognized 220?C insulation system.
-Quiet Performance
-Core and coil assemblies are mounted on rubber isolation pads to reduce noise
-Bolted coil terminations
-Single-piece front/back is easily removable for service
-NEMA 2 drip-proof enclosure is standard; weathershield kits are available for conversion to NEMA 3R outdoor configuration
-Qualified to the seismic requirements of IEEE-693-1997 and IBC-2003
-Copper or aluminum windings
-Copper ground strap
-Robust packaging with top and side protection protects against shipping damage
-Accessible mounting flanges with front/back slotted mounting holes make installation easier
-100% factory tested for shorts and coil integrity, current and loss, voltage, impedance and noise.
-Clear, comprehensive documentation and labeling