Calculate Size of Neutral Earthing Transformer (NET)(Excel)
June 6, 2014 12 Comments
- Calculate Total Capacitive charging current (It).
- Calculate Neutral Earthing Transformer Secondary Current.
- Calculate Required Grounding Resistor value at primary side (Rp).
- Calculate Required Resistance value at secondary side (Rsec).
- Calculate Neutral Earthing Transformer X/R Ratio
- Calculate Fault current through Neutral (single line to ground fault) (If)
- Calculate Rating of Neutral Earthing Transformer (P).
JIGNESH PARMAR
thank you sir
Thank a lot and more power.God bless you.its very helpful. Please next time buss bar calculation.
Regards, Angelito
very useful. thank you so much
Sir, I m working for a govt utility and we r having a 220/132/33KV Grid S/S which has a main-1 &Main 2 Bus System with One and half breaker system for 220KV lines.Recently we had a system disturbance on 220KV System.Due to bus-fault on Bus-1 all the breakers tripped on Bus Zone 1 Realy operating.But on Bus 2 none of the breakers tripped at the Substation end but the feeders tripped on other end.So all the 220KV feeders tripped and system disturbance occured.But I m confused how on busfault on one bus the feeders on other Bus tripped at other end .Kindly reply soon. Yours Faithfully,
A.K.Seth
Sir, we are planed to installed zigzag trafo for neutral grounding at 7.5 mva Dd0 secondary load side what iss the size of zigzag trafo requied and at how much cueent we have to restricte earth fault level please let me clear.
Regards
Darshan Thakur
Dear Sir,
Could you provide me the basis of selection of NER which limit the ground fault current to certain value which by any means shouldn’t less the charging capacitance current
tell me about drives
Sir,
Can you please send me the details of calculation sheet for 6 MVA 33/11 kv neutral earthing conductor and body earthing conductor.
Hello sir
Thanks for your continuous guidance to all electrical professionals.
My query is how to decide or is there any calculation which decides i should go with zigzag Tansformer or three winding transformer selection and its capacity calculation?
Basis for neutral grounding transformer selection.
Dear Sir
Could you provide me the basis of selection of NGR for dristribution system which limit the ground fault current to certain value which by any means shouldn’t less the charging capacitance current
thank you sir
Dear Mr Jignish,
The purchase option is given single item in your site , kindly give us an option of selecting multiple item in single shot , otherwise it become quit teddies to pick and choose .
REgards