stratford
Electrical
- Oct 3, 2005
- 40
Dear all, on site we have a 170MVA generator with 15kV voltage output, Y connection, earthed through transformer and resistor.
On this generator we notice from the first day of operation a consistent difference on the terminal voltage, meaning that on normal operation we measure phase A 14.99kV, phase B 15.15kV, phase C 15.18KV.
This is noticed during full speed no load (when the generator circuit breaker is open) and when the generator is synchronized to the grid via the step-up transformer.
Can you give me some points of searching or testing?
Voltage is measured on the terminal box of the generator (before the star connection) and on the brekaer side.
On this generator we notice from the first day of operation a consistent difference on the terminal voltage, meaning that on normal operation we measure phase A 14.99kV, phase B 15.15kV, phase C 15.18KV.
This is noticed during full speed no load (when the generator circuit breaker is open) and when the generator is synchronized to the grid via the step-up transformer.
Can you give me some points of searching or testing?
Voltage is measured on the terminal box of the generator (before the star connection) and on the brekaer side.