Easergy measurement with Phase rotation Enabled

[sesa158822_brid]

Dear community

I need some guidence on resolving an issue :
We are using Easergy P3 with 2LL+VN/LLY  voltage mode in the "ACB" reverse rotation system,
Since Easergy relay is swapping readings of Phase "B" and "C" ( Voltage and Current ) to adopt the mesurement with ACB system,
this is causing issue and wrong measurement with 2LL+VN/LLY mode.
We  ended up to change relay connection to have correct reading on synch voltage.
Now current angle are not read correctly.....
I compared it with MiCOM P145, 
P145 reading is correct under both ABC and ACB system , and sequence components are also read correctly.

Appreciate your comments.

Regards

[Juha]

Hi @sesa158822_brid, the relay is measuring exactly what in injected to the relay. The realy can't possibly know which way the network is rotating but it is all about how the wiring is done. I always say that there is no absolute reference available for angles. 

Now, for ABC rotation, the wiring of the relay for 2LL+U0/LLy measurement mode is such that the relay is 
measuring UAB and UBC. For synchrochekc UAB is measured. 
For ACB rotation relay is wired as follows then: UAC, UCB and UAC for synchrocheck.
Let me add here a simple sketch of the wiring.

BR

-juha-

[sesa158822_brid]

Hi Juha
Thanks for eplay
few points:
when we set the relay with " Enable phase rotation" what relay will do?
it suppose to overcome the phase rotation and compensate it.
but what it is doing , it is simply swapping reding of Phase "B" and "C" 
means if we inject to phase "B" of the relay, it will be seen as pghase "C" current and vise versa.
So based on your comment , first we need to figure out which phase have been swapped and then change the connection accordingly? then ACB and CBA rotation will need different connections.

Thanks for your comment

Rgards
Farhad