Perhitungan Grounding Instalasi
2
Perhitungan Grounding Instalasi R t = 50 V Trip Current = 50 V KMCBxI n = 50 2,5 x 46 =0,43 Ω R g = 0,5 xV sistem Trip Current = 0,5 x 220 2,5 x 46 =0,96 Ω I g = V sistem R tana h +R g = 220 0,43+0,96 =158,27 A a= √ I g 2 x t k = √ 158,27 2 x 30 5,3 =11,91 mm 2 r= √ a π = √ 11,91 3,14 =1,94 mm=1,94 x 10 −3 m R= ρ 2 xπxl ( ln 4 xl r −1 ) = 100 2 x 3,14 x 10 ( ln 4 x 10 1,94 x 10 −3 −1 ) ¿ 1,59 x 8,93=14,19 Ω 1 R p =k ( 1 R + 1 R ) ; maka, --» R p = 1 k ( R 2 ) = 1 5,3 ( 14,19 2 ) = 1,34 Ω elektroda
-
Upload
abdulloh-khoirony -
Category
Documents
-
view
17 -
download
0
Transcript of Perhitungan Grounding Instalasi
Perhitungan Grounding Instalasi
Rt=50V
TripCurrent= 50VK MCBx I n
= 502,5 x 46
=0,43Ω
Rg=0,5 xV sistem
TripCurrent=0,5 x2202,5 x46
=0,96Ω
I g=V sistemRtana h+Rg
= 2200,43+0,96
=158,27 A
a=√ I g2 x tk=√158,272 x 305,3=11,91mm2r=√ aπ=√ 11,913,14
=1,94mm=1,94 x10−3m
R=ρ
2 x π x l (ln 4 x lr −1)= 1002 x3,14 x 10 (ln 4 x10
1,94 x10−3−1)¿1,59 x8,93=14,19Ω
1R p
=k ( 1R + 1R ) ; maka, --» Rp=
1k ( R2 )= 1
5,3 ( 14,192 )=1,34Ω
Keterangan :
Rt = R tanah ( Ω ) K MCB = konstanta MCB --» 2,5
elektroda
I n = arus nominal MCB ( A ) Rg = R gangguan ( Ω ) I g = arus gangguan ( A ) a = luas penampang elektroda ( mm² ) t = waktu gangguan ( detik ) --» 30 detik k = konstanta --» 5,3 r = jari-jari elektroda ( m ) R = resistansi satu elektroda ( Ω ) ρ = resistansi jenis tanah ( Ωm ) l = panjang elektroda ( m ) Rp = resistansi elektroda setelah diparalel ( Ω )
