4.18 Overexcitation (Volt/Hertz) Protection (ANSI 24)
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7UM62 Manual
C53000-G1176-C149-3
Figure 4-13
Tripping Time Characteristic of Thermal Replica and of Stepped Stage of the
Overexcitation Protection (Pre–settings)
1.1
1.2
1.3
1.4
1
2
3
5
10
20
30
50
100
200
300
500
1000
2000
3000
10000
t [s]
U f
⁄
U
N
f
N
⁄
-----------------
T U/f>>
(Pickup/warning stage)
U/f>
U/f>>