IEC 60909-3:2009/COR1:2013

IEC 60909-3 CEI 60909-3
(Edition 3 – 2009) (Édition 3 – 2009)

Short-circuit currents in three-phase a.c. Courants de court-circuit dans
systems – les réseaux triphasés à courant alternatif –

Part 3: Currents during two separate Partie 3: Courants durant deux courts-circuits
simultaneous monophasés simultanés
line-to-earth short circuits and partial short- séparés à la terre et courants de court-circuit
circuit partiels
currents flowing through earth s'écoulant à travers la terre

CO RRI G E NDUM 1
Corrections in the French version are given after the English.
Table 2. – Resistivity of the soil and equivalent earth penetration depth
Replace for rocks 5150 by 5100 and for farmland 1320 by 931 as follows:
Equivalent earth penetration depth δ
Soil resistivity ρ
Soil types m
Ωm
for 50 Hz for 60 Hz
Granite
>10 000 >9 300 >8 500
Rocks 3 000 . 10 000 5 100 . 9 330 4 670 . 8 520
Stony soil 1 000 . 3 000 2 950 . 5110 2 690 . 4 670
Pebbles, dry sand 200 . 1 200 1 320 . 3 230 1 200 . 2 950
Calcareous soil, wet sand
70 . 200 780 . 1 320 710 . 1 200
Farmland
50 . 100 660 . 931 600 . 850
Clay, loam
10 . 50 295 . 660 270 . 600
Marshy soil
<20 <420 <380
8.3.2.1 Case 1: R → ∞
EF
Replace Equations 51b and 52b as follows:
 = 0 I ≈3I +(2+r )I (51b)
A
S1Amax (0)A 3 (0)B
 =  I ≈3I +(2+r )I (52b)
A
S1Bmax (0)B 3 (0)A
Replace Equations 54b and 55b as follows:
 = 0 I =−r 3I (54b)
A
EδAmax 3 (0)B
 = 0 I =−r 3I (55b)
B
EδBmax 3 (0)A
September 2013 Septembre 2013
D.2.2 Cable impedances per unit length
Replace the last equation as follows:
 
µ µ δ
 
0 0
3ω + j3ω
...