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Topic: setting OCR

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Lans Koperal
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setting OCR
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120% masa untuk trip adalah 5minit

150% masa untuk trip serta merta

betul x abg2 senior



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yup.. betul tu... kat sini semua junior..

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itu yang dalam buku......tapi masa calibration ....injection mesti:

100% pick up / to carry

130% trip 5 min

200% trip 1 sec

300% high set.

atu la setting masa buat calibration EF / OC relay....



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wah.. ada lagi... info yang bagus.. tq..
erm.. utk calibration protection relay je kan?

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klu untuk EFR lak mcm mana % dy????

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Untuk EFR,,hanya 10% je dr saiz Current Transformer

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wa.. contohnya camne tu Mr. karanman?

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kalu ELR atau EFR 10 % dari CT ratio

contoh kiraan calibration: 

CT 1000/5A

EFR 10% 

 

jadi arus bocor yang di benarkan:

 

TO CARRY:

1000A x 10% = 100A arus primary (to carry)

5A x 10% = 0.5A arus secondary (to carry)

 

Arus trip dalam 5 min 130%:

100A x 1.3 = 130A primary

0.5A x 1.3 = 0.65A secondary

 

Arus trip 1 sec 200% :

100A x 2.0 =200A primary

0.5A x 2.0 = 1.0A secondary 

 

high set 300% :

100A x 3.0 = 300A primary

0.5A x 3.0 = 1.5A secondary

 

Arus secondary ( to carry) la yang di setting pada relay.

Ade relay yang di seting pakai percent.

untuk overcurent kiraan yang sama mcm di atas.....

Tapi untuk overcurrent banyak aspek kene ambik kira.

Maximun demand,saiz kabel,sais breaker,saiz ct,jenis load...SSB dll....



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tq for info.,..

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kurang jelas sikit pasal ni......
ada sapa2 yg boleh bntu lg... apapun thnk zaidi

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kurg jelas macm mana tu? nak setting untuk apa sebenarnya?

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kurang jelas tang mane tu......



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kalau EF @ EL 10%....
pas tu knp kena kira 130% 200% lak???

EF akan trip bila arus primry yg lebih???

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Earth Fault Relay biasanya akan diset 10% drpad CT ratio cam kawan2 kita lain bgtau.

cth nye kalau CT 200/5A

selalu setting pada EFR adalah 10% x 5A = 0.5 A (kat secondary) => 20A primary

time multiplier setting ,TMS biasanya 0.1s

then depends on jenis relay @ characteristic , IDMT (Normal inverse NI, LTI dll ) atau DT

kalau relay dr jenis @di'set' dengan Normal Inverse

bila terjadi earth fault dengan fault current lebih dr ni nilai arus yg diset,  sebagai contoh  Ifault =  40A(Isec=1A) ( 200% dr nilai yg diset), relay sepatutnya akan trip dlm masa 1 second.

huhu

 



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Wah..
Pening kepala tengok pengiraan OCR..
Nak kena belajar dengan abang2 senior dekat sini dulu..
Tolong ajarkan saya..

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Lans Koperal
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sbnrnye an,sy x phm lngsung setting yg deceritakan di ats...yg sy buat setting x smpai pown 5 mnt.stau sy yg 5mnt tu Oil Dash Port..bkn EFR&OCR...mggu dpn ad wat callibrate jenis normal inverse IDMT EFR&OCR..nt sy cte mngikut ape yg sy buat n phm...

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amy
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kire kn bende protection nie kite yg setting..ade dua jenis...1st instantaneous and 2nd IDMT/time delay.....time delay nie kite boleh setting..
nk 5 second ke, 5 minit ke, 5 jam pon boleh...kenape dia adekn time delay..ini kerana kdg2 fault level nie kdg je jadi, contoh nye mcm
kite start motor elektrik...kn amp nye tinggi...tp bile dh lame sket amp jatuh kn..xkn start je nk trip...jenuh la chargeman nk reset..
yg % tue mksud nye mkin tinggi % makin perlu cepat untuk beban itu dipisahkan dr supply..

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Lans Koperal
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jd pe perkara yg cbe anda kongsikan?

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Salam bro...

Adakah 4 setting yg bro sebutkn ni dibuat pada OCR/EFR/ELR? Atau hanya satu je setting dibuat cthnya 5 min..

 



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