REX 010 and REX 011 Gen Stator Prot
REX 010 and REX 011 Gen Stator Prot
(OP)
Hi, anybody got experience working with the REX 010 and REX 011 module which used for Gen Stator E/F protection(59GN-95%, 64GN-100%, and 64GN)? This equipment is belongs to ABB. Why they need to inject pulse voltage at the generator neutral point?
Thanks in advance.
Thanks in advance.






RE: REX 010 and REX 011 Gen Stator Prot
It's 100% injection principle.
In case of stator earth fault near to the neutral point standard 95% do not sensetive.
more from than, you can see earth fault on the standstill generator.
Work fine.
Best regards.
slava
RE: REX 010 and REX 011 Gen Stator Prot
RE: REX 010 and REX 011 Gen Stator Prot
You have a good explanation at the manual of REG216.
Please see attached great document of Mr. Mozina,
Are you need provide design, commissioning of REG with REX?
Best Regards.
Slava
RE: REX 010 and REX 011 Gen Stator Prot
RE: REX 010 and REX 011 Gen Stator Prot
RE: REX 010 and REX 011 Gen Stator Prot
Please take in account: if you havent expirience with REG216 and REX DON'T TRY COMMISSIONED IT BY YOURSELF.
You must take some course in ABB and first commissioning provide with some expir. guy.
I don't know where you are.
You have good centers in Euoropa: ABB Swiss ( Baden), ABB Holland and ABB German. As far, as I know ABB South Africa have good guys too.
About Areva, I don't know, it;s old Alstom relays.
Beckwith and Simens(maybe) have such sytems.
Why made this cubicles and design? What is size of generator?
Regards.
slava
RE: REX 010 and REX 011 Gen Stator Prot
regards,
bdf
RE: REX 010 and REX 011 Gen Stator Prot
500MVA is generator...
REX's need for the rotor and stator E/F?
You have local support, is good and important.
Are you familar with CAP2-316 , HMI of REG216?
Very important point: SAFETY, REX's inject low voltages signal on the neutral point after neutral trafo, that means
on the stator of generator you will have high voltage ( 50V x grounding trafo ratio). Please take in account and turn off power supply of REX at teh panel REG.
Regards.
Slava
RE: REX 010 and REX 011 Gen Stator Prot
RE: REX 010 and REX 011 Gen Stator Prot
strange for me, 500MVA with resistance grounding, I think it's Erop. mnf.
No problem with Rotor E/F, is less work for your.
Please send to Forum part of this connection ( Stator E/F) with REX. usually it's one page. REX have two option, primary and secondary injection. I would like see , what you have and recommend a few important points.
regards.
Slava
RE: REX 010 and REX 011 Gen Stator Prot
Thanks.
RE: REX 010 and REX 011 Gen Stator Prot
It's primary connection , that means, it's REX011 instead REX011-1(2)as on the drw, that used for the secondary injection type.
Resistors seems OK, typical value is 150 and 1000 Ohm, I hope designer calculated this size.
Somehow calibrate:
1. are you provide both tests on the standstill generator: one for MTR value and second for the REs value,.
2.Are you provide test of curve.
3.Are you meas direction of Us and Ui, it must be same direction.
terminals 10,11 on the REX011 aren't used , are for the rotor E/F injection.
If possible , could you please attac valible report, if you haven't standard form, I will attached here.
Good Luck.
Slava
RE: REX 010 and REX 011 Gen Stator Prot
Thanks in advance.
RE: REX 010 and REX 011 Gen Stator Prot
Congratulation!!!!!Your first 100% stator E/F.
I very happy for you.
If you tested those 3 points ( MTR, Res and curve) test of direction no needed.
Are curve OK? it's something like to saturation curve ( I mean form of curve), usuallu after 17-19kOhm it's like to saturation.
Alarm about 10kOhm, trip about 1kOhm.
Best Regards
Good Luck
Slava
RE: REX 010 and REX 011 Gen Stator Prot
Thanks for the kind advice. If you need to do the direction of the Ui and Us how would you do?
RE: REX 010 and REX 011 Gen Stator Prot
Curve isn't seems, sorry.
What was calculated MTR and what is tested value?
What was Res and tested value?
I strongly recommend back to test.
For direction test you need scope with two channels.
Possible used on-line analog meas of REG216, but it's difficult explain via forum or e-mails.
Wave of Ui asnd Us must be i same direction, if not, you cross wiring on the terminals in the cubicle.
Best Regards.
Slava
RE: REX 010 and REX 011 Gen Stator Prot
Sorry for not reply for quite some time and as you asked;
caluculated MTR (measuring transformer ratio) value: N12/N11 = (21000/sqrt3) / 100 = 121.24
measured MTR value by REG is 127.3
Calculated Res Value is 900 ohm.
Measured Res value by REG is 760 Ohm.
Accordng to my trainer this is good enough and we just use this value for the documentation.
Together have attached pic of the curve of the resistance. X' axis is the actual value of the resistance placed in Neutral Point and the Y' axis is the measured resistance by the REG 216. Your comments is hightly preciated. Now the unit is running and we even test the 100% earth fault (during generator no load test) protection. The test was ok.
RE: REX 010 and REX 011 Gen Stator Prot
Thanks a lot for the feedback.
Yep, is good result.
I'm really happy for you.
Good Luck and All best.
Slava