Phase Rotation

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Anonymous Poster #1	Phase Rotation 10/07/2019 2:37 PM
	is this the same phase rotation A,B,C connection and C,A,B and could they be in synch to close these two systems
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Rixter Guru Join Date: Apr 2010 Location: About 4000 miles from the center of the earth (+/-100 mi) Posts: 9910 Good Answers: 1141	#1 Re: Phase Rotation 10/07/2019 4:46 PM
	That's the same phase rotation. On one machine, the rotor would be physically 120 degrees behind the other.
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Andy Germany Guru Join Date: Sep 2006 Location: Near Frankfurt am Main, Germany. 50.390866N, 8.884827E Posts: 17996 Good Answers: 200	#2 Re: Phase Rotation 10/08/2019 2:05 AM
	Same phase rotation "direction", but "120° out of phase", as has already been mentioned, assuming they are being shown at the same time. That is not in phase, therefore NOT the time to connect them together (Parallel). Paralleling when not in phase, or close to, results in huge currents flowing, and possible serious mechanical damage to either or both alternators. I cannot answer better than that, as you neglected to mention exactly why or what information you are seeking. I do recommend a full and proper professional training on the technical side of paralleling of 3 Phase AC Alternators, as it would be easy to cause serious and expensive damage if done wrongly. __________________ "What others say about you reveals more about them, than it does you." Anon.
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pcchatur Power-User Join Date: Mar 2010 Location: BHOPAL, INDIA Posts: 201 Good Answers: 20	#3 Re: Phase Rotation 11/12/2019 11:17 AM
	Yes they are the same. For better understanding repeat the sequence. For example in first case it would be ABCABCABC.....And in second case it would be CABCABCAB..... you would find CAB in first case and ABC in second case. In a generator if there are 3 terminals first on the left second at the center and third at the right and if voltage becomes maximum in left terminal and then in central terminal and then in right terminal (and then again it repeats) then your phase sequence would be left center right. Now you call these terminals A or B or C, it doesn't matter as long as sequence is maintained I.e. voltage is maximum in left terminal and then in in central terminal and then in left terminal. Some countries call then RYB or RST whatever. Generator sequence is decided by what the design says I.e. left center right. This is fixed. Now it is for any body to mark the terminals and then the phase sequence will be what name you give them
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Andy Germany (1); pcchatur (1); Rixter (1)

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