8-2 B90 LOW IMPEDANCE BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
OVERVIEW CHAPTER 8: APPLICATION OF SETTINGS
8
Figure 8-1: Sample bus configuration
The table shows the assumed short circuit contributions of the connected circuits and their DC time constants.
Table 8-1: Basic fault data of the connected circuit
The basic CT data is presented in the following table. The magnetizing characteristics of the three different types of CTs
used in this example are shown in the following figure.
Table 8-2: Basic CT data
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
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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