GE B30 Instruction Manual page 374

10.1 OVERVIEW
The following table shows the assumed short circuit contributions of the connected circuits and their DC time constants.
Table 10–1: BASIC FAULT DATA OF THE CONNECTED CIRCUIT
CIRCUIT
C-1
C-2
C-3
C-4
C-5
The basic CT data is presented in the table below. The magnetizing characteristics of the three different types of CTs used
in this example are shown in the following figure.
Table 10–2: BASIC CT DATA
CT
CT-1
CT-2
CT-3
CT-4
CT-5, CT-6
CT-7, CT-8
10
10-2
I (KA) T (MS)
FAULT DC
0.00 N/A
0.00 N/A
6.00 5
5.00 30
3.00 40
RATIO V (V)
SAT
600:5 144
600:5 144
1200:5 288
1000:5 240
1000:5 240
1200:5 288
Figure 10–2: APPROXIMATE CT MAGNETIZING CHARACTERISTICS
B30 Bus Differential System
10 APPLICATION OF SETTINGS
R (Ω) LEADS (M)
CTSEC
0.34 210
0.34 205
0.64 200
0.54 200
0.54 180
0.64 200
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