Calculation of IDMT Over current & Earth Fault Relay Setting:
October 13, 2012 28 Comments
IDMT Over current & Earth Fault Relay Setting:
- Calculate IDMT Over Current Relay Setting (50/51)
- Calculate IDMT Over Current Relay Pick up setting.
- Calculate IDMT Over Current Relay PSM.
- Calculate IDMT Over Current Relay Time setting.
- Calculate Actual Operating time according to Various IES Curve.
- Calculate Low current Setting(I>).
- Calculate High Current Setting(I>>)
- Calculate Actual Operating Time of Relay(t>)
- Calculate Actual Operating Time of Relay(t>>)
- Calculate IDMT Earth Fault Relay Setting (50N/51N)
- Calculate IDMT Earth Fault Relay Pick up setting.
- Calculate IDMT Earth Fault Relay PSM
- Calculate IDMT Earth Fault Relay Time setting
- Calculate Actual Operating time according to Various IES Curve.
- Calculate Low current Setting(Ie>)
- Calculate High Current Setting(Ie>>)
- Calculate Actual Operating Time of Relay(te>)
- Calculate Actual Operating Time of Relay(te>>)
JIGNESH PARMAR
Could u please explain selection of MCB, ELCB and cable selection for Electrical DBs?
light, power, AC unit, single phase,three phase etc..
Refer Page of “Electrical Tools” of this Blog……….
What is the settings of protection relay Micom p121 connected to 208 feeder incomer circuit breaker CT 1600/5 Transformer 2300/208v z= 6.03% 500kva. 2300v feeder supplied via oil fuse switch with 160 amps fuses. Please find me O/C & EF 208 v incomer relay settings?
how to set for high set e/f relay for 400/1amp ct for 33kv feeder
very good, supper
In case of 22kv ht line, if loose or improper connection at any phase , it always show fault at LT side for Earth fault and LT breaker keeps on tripping . Observed this condition mostly when rainy seasons starts.
Hi Jignesh,
You have a real good workmanship ..Aprreciate the efforts and accuracy.
Do you have a excel sheet to do touch volatage calculation for a site.
Also how to calculate the impedances on phase sub circuits , sub circuits earth , submains and phase..please assist me
hi jignesh thanks for ur wonderful work i av one request can u tel me that how to calculate impulse calculation for power transformers ,because this known only few people am also design power transformer design engineer am waiting for ur reply
thank you very much for these useful programs
hello sir
Your are awesome
Ur dedication in Electrical field is impressive
Thank you very much for the information on Electrical safety clearance
Dear sir,
Thanks for sharing the calculations. Can you please give me the setting calculations for 64R relay.
Dear sir
we have motor of 200 kw , FLC 24 A Ht motor ABB make with we have used SPAM 140c MPR relay kindly tells us how relay setting is done.for example what value of current is set of I> I>> etc.
Regards
Gaurav shah
i just want to tell u you…sir..
you make all sense of electrical parameter to us….working and guide like god of electrical engineering….thank you so much for your support.
Que.1 why TR NCT ratio higher than primary side CT? might be for fast response at small fault current? nt clear.
Que.1 In 220/66/11 switchyard 220kv level we use Y-Y1 type vector group trafo and 66kv side as general we know Dy11 used.
pls answer sir…
thank u so much
Thanks alot
Gud afternoon Sir.
For elect. Designing which course will be better- to develop and calculate
Short and clear calculations
sir please tell me about micom p111
50/51/50N/50N/ micom-111L
over current setting and earth fault protection setting
DEAR SIR,ction realy
I need electrical transmission protection realy (ret650,ref 615),feeder protection relay calculation OR can you suggest me any easy reference book, we are easily understand all this things
Dear sir,
Thankyou for sharing the IDMT oc & ef relay calculations.
Dear sir,
I am servicing in defense sector. I recently assigned for electrical department.
Can u pls say about working of over current & EF relays with current direction( normal & fault).
If u refer any book or article also finr foe me.
Can you please explain how to do earth fault protection settings in low voltage switchgear?
We have Step-up Transformer 3.6MVA, 0.433/6.6KV, LV Delta and HV Star, Primary 4800Amp., Secondary 314Amp. What will be the CT Ratio and Burden? We should use NCT or REF CT for Earth fault Protection of Transformer.
Sir,iam working in power generating plant having capacity of 21MW.We are facing a problem in 11KV over head distribution(ACSR bare conductor through RCC poles around 2KM from our 11KV panel)line.If any earth fault occured in the 11KV overhead line the generator incomer tripped due to earth fault.Thanks for suggestion
Hi Sir where I can I download the software?
sir where i can download these file?