Voltage Levels
Voltage Levels
(OP)
We have a project were the engineer has requested to modify our 21kV transformer taps in order to achieve a secondary voltage level of 510V. I know motors have rating of +/-10% so it should be Ok. However I would like to understand other impacts






RE: Voltage Levels
Basically, everything will be seeing a high voltage, including all of the 120 V, 208 V, and 277 V loads, unless the taps of all of these transformers are adjusted.
Motors and transformers are probably the main concern, since they operated pretty close to magnetic saturation due to economics.
Motor operating parameters such as efficiency and power factor are based at operating at nominal voltage, so these will definitely change if you operate them at +9%.
RE: Voltage Levels
RE: Voltage Levels
RE: Voltage Levels
Keith Cress
kcress - http://www.flaminsystems.com
RE: Voltage Levels
Transformer get hot when operated at higher than rated voltages. I can still remember the smell of frying winding insulation in that case.