100
SIVACON S8 Planning Principles –
Technical annex
Rated power
S
rT
Rated voltage
400 V AC / 50 Hz
525 V AC / 50 Hz
690 V AC / 50 Hz
Rated value of the short-
circuit voltage
u
kr
Rated value of the short-
circuit voltage
u
kr
Rated value of the short-
circuit voltage
u
kr
4 %
6 %
4 %
6 %
4 %
6 %
Rated
current
I
r
Initial short-circuit
alternating current
I
k
“
1)
Rated
current
I
r
Initial short-circuit
alternating current
I
k
“
1)
Rated
current
I
r
Initial short-circuit
alternating current
I
k
“
1)
50 kVA
72 A
1,933 A
1,306 A
55 A
1,473 A
995 A
42 A
1,116 A
754 A
100 kVA
144 A
3,871 A
2,612 A
110 A
2,950 A
1,990 A
84 A
2,235 A
1,508 A
160 kVA
230 A
6,209 A
4,192 A
176 A
4,731 A
3,194 A
133 A
3,585 A
2,420 A
200 kVA
288 A
7,749 A
5,239 A
220 A
5,904 A
3,992 A
167 A
4,474 A
3,025 A
250 kVA
360 A
9,716 A
6,552 A
275 A
7,402 A
4,992 A
209 A
5,609 A
3,783 A
315 kVA
455 A
12,247 A
8,259 A
346 A
9,331 A
6,292 A
262 A
7,071 A
4,768 A
400 kVA
578 A
15,506 A
10,492 A
440 A
11,814 A
7,994 A
335 A
8,953 A
6,058 A
500 kVA
722 A
19,438 A
13,078 A
550 A
14,810 A
9,964 A
418 A
11,223 A
7,581 A
630 kVA
910 A
24,503 A
16,193 A
693 A
18,669 A
12,338 A
525 A
14,147 A
9,349 A
800 kVA
1,154 A
-
20,992 A
880 A
-
15,994 A
670 A
-
12,120 A
1,000 kVA
1,444 A
-
26,224 A
1,100 A
-
19,980 A
836 A
-
15,140 A
1,250 kVA
1,805 A
-
32,791 A
1,375 A
-
24,984 A
1,046 A
-
18,932 A
1,600 kVA
2,310 A
-
41,857 A
1,760 A
-
31,891 A
1,330 A
-
24,265 A
2,000 kVA
2,887 A
-
52,511 A
2,200 A
-
40,008 A
1,674 A
-
30,317 A
2,500 kVA
3,608 A
-
65,547 A
2,749 A
-
49,941 A
2,090 A
-
37,844 A
3,150 kVA
4,550 A
-
82,656 A
3,470 A
-
62,976 A
2,640 A
-
47,722 A
1)
I
k
“ uninfluenced initial symmetrical transformer short-circuit current in consideration of the voltage and correction factor of the transformer impedance in
accordance with IEC 60909-0, without considering the system source impedance
Tab. 10/6:
Rated currents and initial symmetrical short-circuit currents of three-phase distribution transformers
Exemplified by
• Rated transformer power
S
rT
= 500 kVA
• Voltage factor k
k = 1.45 A/kVA for a rated voltage of 400 V
k = 1.1 A/kVA for a rated voltage of 525 V
k = 0.84 A/kVA for a rated voltage of 690 V
• Rated short-circuit voltage
u
kr
=4 %
there are the following approximations for
U
r
= 400 V:
I
r
= (1.45 x 500) A = 725 A
I
k
“ = (725 x 100 / 4) A = 18.125 kA
10.6 Three-phase distribution
transformers
Important parameters for the connection of the SIVACON
S8 low-voltage switchboard to three-phase distribution
transformers are listed in Tab. 10/6.
Approximation formulas for current estimation, if there are
no specified table values:
For the rated transformer current by approximation:
I
r
= k x
S
rT
For the initial symmetrical transformer short-circuit current
by approximation:
I
k
“ =
I
r
/
u
kr
Содержание Sivacon S8
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