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