SF2 CB SPECS
•
Effective KVAR for the installed single tuned filter =2450KVAR
•
System voltage= 13.8 KV
1 Circuit breaker sizing as per IEC 62271-100
1.1Input data for selection of Circuit Breaker as per IEC 62271-100
Input data
SN
1
2
3
4
5
6
7
8
9
10
11
Item
Filter fundamental current (A)
Filter total current (ungrounded) A
System voltage (KV)
SWGR rated short circuit (KA)
Short circuit duty(I ‘‘K)
Inrush current t(KA) For filter
Inrush frequency (KHZ) For filter
Inrush I×F(KAKHZ) For filter
Outrush current (KA) For filter
Outrush frequency (KHZ) For filter
Outrush I×F (KAKHZ) For filter
Value
102.62
1.25 × 102.62= 128.28
13.8
25 KA
23.627 KA
0.588
0.257
0.151
0.606
0.257
0.156
Referance
As per design
As per IEEE Std 1036-2010, 4.2.1
DWG: XB.0536-ABB
DWG: XB.0536-ABB
As per ETAP
As per Calculation
As per Calculation
As per Calculation
As per Calculation
As per Calculation
As per Calculation
1.2Rating Selection for Circuit Breaker of SF2 M-SG201 A & B Capacitor bank
Rating Selection for MV CB as per IEC 62271-100, 2008
Parameter
Value
Reference for values
SN
1
CB type
As per SWGR,
Indoor
S1, C2
2
CB class
3
Rated Voltage, Ur (Kv, rms)
17.5
4
Rated Normal current (A, rms)
1250
5
5.a
Rated Short Circuit Breaking current (Isc)
r.m.s. value of its a.c. component
As per IEC 62271-100, clause:4.107 and
clause:3.4.119
As per IEC 62271-1 2007 Clause 4.1
Check As per IEEE Std C37.06-2009, , tabel 1
As per IEC 62271-1-2007, Clause 4.4.1
Check As per IEEE Std C37.06-2009, tabel 1
31.5
As per IEC 62271-100, clause 4.101.1
As per IEEE Std C37.06-2009, tabel 1
DC time constant of the rated short-circuit breaking
current, in milli seconds
45
As per IEC 62271-100, clause 4.101.2
6
TRV, (Peak value uc in KV
30
7
First pole to Clear factor (Kpp)
1.5
8
Rated short-circuit making current, kA peak
9
10
11
Rated duration of short-circuit in Seconds
Preferred Peak inrush current (KA, peak)
Preferred Inrush frequency (KHZ)
As per IEC 62271-100, Table-1 on Page 52 and
Table-24 on Page 126.
Check IEEE std C37.06-2009, table2
IEC 62271-100Page 172 and Table 24 on Page
126.
Check IEEE std C37.06-2009, table2
As per IEC 62271-100,clause 8.103.4
Check IEEE C37.06-2009, table1
This is only option with 40kA rating CB (of ABB)
As per IEC 62271-100-2008, Table 9, page 61
As per IEC 62271-100-2008, Table 9, page 61
in kA
5.b
31.5 x 2.6 =
81.9
3
20
4.250