Summation Transformer

[Cerkit]

Hi,

I am looking at using a 1:1:3 summation transformer for a phase comparison system.

For a blue-ground internal fault is it correct that if I find what the fault values are entering from each side of the circuit I can then take 33.3% of each value to see if it is above the threshold of the relay? Ib> 33.3%K

 

[cuky2000]

Hi Cerkits
Perhaps is my ignorance in this subject but I have to confess that do not understand the terminologies used and the questions posted.

 

[7anoter4]

See[for instance]:

https://circuitglobe.com/summation-current-transformer.html

 

[Palletjack]

Couple of questions...
most microprocessor relays now don’t need summation transformers. What type of relays are you using?
I may not understand your question exactly...
You want to say a line has a maximum fault level of 1000 amps. Three lines, 3000 amps. The relay need to be set to 1/3 of the summation value. Correct?