Guide to plot the impedance plane (distance protection)

[woodstock12]

Dear all,

I need to commission a few unit of LFZR111 relay. it is very old relay and i find it hard to understand its technical manual. i tried to use various RIO converter such as LFZRtest, Omicron RIO converter, and Omicron xrio, but all the outcome did not match relay characteristic.

do anyone here have some soft of tutorial, or guide on how to plot the LFZR111 impedance plane? or any example? or anyone could guide me?

a) the relays are very sure in working condition.
b) the relays are in latest software Q package.

your help is very appreciated.

thank you.

 

[OliverJanke]

Hi Woodstock,

I don't know the LFZR111, but I can help you with using any converter or using the OMICRON Test Universe. You have to draw the characteristic in the RIO function Distance within the Test Object. I am not sure about your exact problem, is it that you don't know how to draw the characteristic with the OMICRON tools? Or do you want to know how the characteristic is looking like in the relay?

I don't have the manual of the LFZR111 only a brochure, but I think the zones are quite easy to build. Aren't they just circles with a specified center point? Which parameters are used within the relay to define the zones geometry?

Best regards,
Oliver Janke
OMICRON

 

[DTR2011]

I recall testing LFZR112 years ago. I forget what the tracks were. I thought the manual was
Quite good. Are your settings Mho or Quad?

IIRC the manual had a lot of descriptions of using some kind of card extender
That I did not have. I tested as a plain old relay and it was just fine.

 

[woodstock12]

Good day.
i will be testing it with Omicron Advance Distance, and my problem is how the Phase-Neutral characteristic (Quad) is looking like in the relay.

I managed to draw and the relay tripped correctly for Phase-Phase characteristic, however, i have problem on Phase-Neutral distance zone characteristic (Quad).

i find it hard to understand the manual. do you have a guide or tutorial on how to draw distance characteristic?

 

[woodstock12]

to OliverJanke,

i downloaded the Omicron xrio converter, and Omicron rio converter from Omicron website. by using these xrio & rio converter, the Phase-Neutral impedance characteristic generated (by xrio or rio) did not match the relay characteristic.

i suspect it might be my mistake in key-in the setting also, because it is weird that all 3 LFZR111 converter softwares by reputated company (LFZRtest, Omicron xrio, and Omicron rio) didnt work.

Could I send one of the setting file to you, and you help me to generate one?

Thank you very much.

 

[OliverJanke]

Hi Woodstock,

I had a look at the LFZR XRIO converter. It is looking OK and I guess in most cases it should work fine. As I know the XRIO technology very good I would suggest to work with that converter.

When you say Phase-Phase faults are working fine but Phase-Ground are not, I always think about the grounding factor. It is called residual compensation magnitude and angle in this relay. Maybe this point is causing the trouble.

Do you have a relay 'at hand' to try out a residual comp of 1 and 0°?

The XRIO converter also has a switch for 'custom settings'. Is this correctly set?

It would be best if you sent me your advanced distance file or OCC with the bad test results, so I could investigate it. Maybe you can make a 'search test', with 10 or more search lines as this gives the best results.

Unfortunatelly I can not post you my email address here. So you have to upload the file to a puplic place, where I can download it. Or do you have any idea how to exchange adresses privately?

Best regards,
Oliver Janke
OMICRON

 

[woodstock12]

Hi OliverJanke,

ok. i will grab a unit of LFZR111 and test it tomorrow.
thank you for pointing out the residual compensation, i believe it is the trouble too.

regards,
Woodstock