Hi Gerry,
the only problem I can think of is, that you might get saturation on your CTs in Situataion 1. The longer the secondary cable, the higher the burden, the more saturation. But this also depends on the relay type, the CTs and the diameter of the cables.
You should find guidelines how...
Hi,
As mgtrp already said, the problem you might run into is the saturation. The CT will not transmit the full secondary current during external fault conditions. This will look like a differential current to the relay. Depending on the characteristic it will now trip, or not.
The relay...
Hi,
at first I would check the phase currents which are connected to the relay. These should be symetrical (nearly the same magnitude and 120 degrees phase shift) under normal operation. The relay can show the measured values. If they are not symetrical maybe one CT is wrong (wrong ratio)? Or...
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...
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...
We (OMICRON) also offer application notes on how to test the power swing blocking or tripping function with a number of our test modules. You can find them in our customer area on our webpage for download (free of charge). The attached one describes how to test with the OMICRON NetSim module...
Hi Jabrone,
I found this formula:
t(s) = 105.2ms * Td / (M^0.8 - 1) + 26.2ms * Td
with M = multiples of PU.
With your values (Td = 3.5 and M = 5) I get 232ms, so it seems to fit to the values from your manual.
OMICRON customers are supported in testing this relay by using the PTL (free...
