High Voltage Generator Phase Rotation and proper connections made at s
High Voltage Generator Phase Rotation and proper connections made at s
(OP)
Hi, I need this fully explained on a technical level, with
information that can be followed, Thanks.
information that can be followed, Thanks.






RE: High Voltage Generator Phase Rotation and proper connections made at s
dpc
RE: High Voltage Generator Phase Rotation and proper connections made at s
information that can be followed, Thanks. High voltage Generator phase rotation conections made to switchgear.
RE: High Voltage Generator Phase Rotation and proper connections made at s
The power system you are connecting to will also have a phase sequence. The generator phase sequence and system phase sequence must match. If they do not, the generator will be damaged or destroyed.
The only way to really know for sure is to do a phasing check with the generator energized and rotating at synchronous speed but **before** you close the generator breaker. There are various method of doing this, depending on your equipment, voltage, etc. With drawout switchgear, the normal method is take the breaker out, crank open the shutters covering bus and line connections and check across all three sets of phases with hot sticks and a voltage indicator. With the synchroscope at 0 degrees, you should have no voltage across each of the three pairs of breaker poles.
If you do have voltage, you will need to swap two of the generator leads and re-check. You must also make sure your synchroscope (a single-phase device) is connected to the proper phases.
Hope that helps.
dpc
RE: High Voltage Generator Phase Rotation and proper connections made at s
If the phase sequence is in order all the three voltmeters indicating needles will move in TANDEM. You must make sure that PT wiring is correct.
thanks !
sokps
RE: High Voltage Generator Phase Rotation and proper connections made at s
RE: High Voltage Generator Phase Rotation and proper connections made at s
This test can be done by energizing the generator VTs from the bus side, with the generator leads disconnected, then opening the breaker and energizing from the generator. Alternatively, energize the bus VTs from the generator with the external supply off, then open the breaker and energize form the external source. Ensure that the phase rotation meter remains connected to the same VT secondary terminals for boith tests, to avoid any head scratching.
This confirms the phase rotation and the wiring of the synch instruments, so there are no unpleasant surprises on actual synchronizing.