Transformer IDMT Over Current & Earth Fault Relay Setting
November 13, 2012 11 Comments
Transformer IDMT Over Current & Earth Fault Relay Setting:
Calculate LT & HT Side IDMT Over Current Relay Setting (50/51)
- Calculate LT & HT Side IDMT Over Current Relay Pick up setting.
- Calculate LT & HT Side IDMT Over Current Relay PSM.
- Calculate LT & HT Side IDMT Over Current Relay Time setting.
- Calculate Actual Operating time according to Various IES Curve.
- Calculate LT & HT Side Low current Setting(I>).
- Calculate LT & HT Side High Current Setting(I>>)
- Calculate LT & HT Side Actual Operating Time of Relay(t>)
- Calculate LT & HT Side Actual Operating Time of Relay(t>>)
Calculate LT & HT Side IDMT Earth Fault Relay Setting (50N/51N)
- Calculate LT & HT Side IDMT Earth Fault Relay Pick up setting.
- Calculate LT & HT Side IDMT Earth Fault Relay PSM
- Calculate LT & HT Side IDMT Earth Fault Relay Time setting
- Calculate Actual Operating time according to Various IES Curve.
- Calculate LT & HT Side Low current Setting(Ie>)
- Calculate LT & HT Side High Current Setting(Ie>>)
- Calculate LT & HT Side Actual Operating Time of Relay(te>)
- Calculate LT & HT Side Actual Operating Time of Relay(te>>)
Calculate Differential Protection Relay setting:
- Calculate Percentage Differential Current at Normal tapping
- Calculate Percentage Differential Current at Highest tapping
- Calculate Percentage Differential Current at Lowest tapping
JIGNESH PARMAR
awsom…………..speechless………….you are giving lots off info….thx…….
thanks a lot sir for your valuable info..keep this up..
thank u so much Mr.Parmar
ur info: are very helpful, may u lead a successful life …
Dear Jignesh ,
I have some doubt.
Please advice
1) why do we need to have Dual ratio CTs
(I mean Dual Core Dual ratio) I know one core is for measurement and other is for protection.But why do we need to have Dual ratio.
2)Why dual ratio is generally 50% of main and why not some other percent.
Mr. Parmar, please there’s any other way to get this doc? we can’t download it.
Hi sir i am ramesh here,can explain about providing differential protection and REF Protection to transformer and also usage of ICT’s in differential protection and also usage of stabalizing resistor and linear resistor in REF Protection
Hello dear Parmar sir
plz suggest me for thumb rule of fault current at low, medium, high voltage,
IDMT earht fault relay TMAS 101 a. setting IR 0.125 to 1A with 10 setting. TMS 0.1 to 1.0 with 10 setting MAKE- ALIND
QUANTITY———–01 nos
Hi Parmar,
I would like to know about setting Data of OC&EF relay for 33/11KV 5MVA power transformer on LT side(RELAY,MAKE- Crompton Greaves ,CGI14N/C.Please give in detail.
sir, please suggest how to choose the high set over-current and earth-fault setting of any transformer say. (11/0.433kv Dyn11).
Sir please explain idmt overcurrent and earth fault calculation