Selection Of The Power Cable Protection/Filter Input Protection Scheme - ABB PQFS Installation, Operation And Maintenance Instructions

Table 18: Allowed cable current for different cable sections noting the skin effect
Cross section
Nr of
parallel
cables
[mm²] [AWG]
16 6 1
25 4 1
35 2 1
50 1-1/0 1
70 2/0 1
95 3/0 1
120 4/0 1
150 300MCM 1
185 350MCM 1
240 500MCM 1
300 600MCM 1
16 6 2
25 4 2
35 2 2
50 1-1/0 2
70 2/0 2
95 3/0 2
120 4/0 2
150 300MCM 2
185 350MCM 2
240 500MCM 2
300 600MCM 2
Remark: The highlighted values in
filter ratings. Note that in 4-wire systems, the neutral may have to carry up to 3 times the
line current rating of the filter.
6.7

Selection of the power cable protection/filter input protection scheme

Once the power cables have been selected, a suitable cable and equipment protection
has to be selected. The protection only needs to protect the phases and not the neutral. It
is recommended to use fuses of type gG/gL with the RMS current ratings given in
19.
and typical cable manufacturer data – Network frequency 60Hz
Derating Rated
due to current
paralleling [Arms]
1 100
1 130
1 160
1 190
1 230
1 285
1 325
1 365
1 415
1 495
1 550
0.8 160
0.8 208
0.8 256
0.8 304
0.8 368
0.8 456
0.8 520
0.8 584
0.8 664
0.8 792
0.8 880
Manual Power Quality Filter PQFS ç Electrical design and installation 41
Copper
Allowed
Reduction
current
factor
[Arms]
0.996 99
0.99 128
0.981 157
0.965 183
0.941 216
0.911 260
0.88 286
0.85 310
0.817 339
0.775 383
0.738 406
0.996 159
0.99 205
0.981 250
0.965 293
0.941 346
0.911 415
0.88 457
0.85 496
0.817 542
0.775 613
0.738 649
Table 18 refer to cable sizes that correspond to typical
Aluminum
Rated
Reduction
current
factor
[Arms]
75 1
100 1
120 0.99
145 0.98
180 0.97
220 0.95
250 0.93
285 0.91
325 0.89
385 0.85
425 0.81
120 1
160 1
192 0.99
232 0.98
288 0.97
352 0.95
400 0.93
456 0.91
520 0.89
616 0.85
680 0.81
Table
Allowed
current
[Arms]
75
100
119
143
175
210
233
260
288
326
346
120
160
190
228
280
336
374
416
460
522
553