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6F9EOlll
2.3 Protect ion Curves
The protection characteristic curves are shown in Figure 1.
0.
1
0.1 1
10
100 1000
+
Multiples
of Current
(Times)
No.
Beating
time
constant
Coin)
f
lillowable Rated
temperature temperature
rise rise
rc)
CT)
unba 1
awe
--
0 5
10 15 20 25 30 35
+Unbalance
factor
6)
Short-circuit.
Overcurrent.
and Undercurrent
1000
0.01
0.1 1
10
100 1000
+
Multiples of Current
(Times)
8
1.
5
.:
1
1
1
Ground
current
i
‘%,*
0 5
10
15 20 25 30 35 40 45
4round
current
(!A)
(ratio with respect to
ZCT
rating)
Figure 1 Protection Characteristic Curves
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17
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