19
4
Rated and setting currents
In
= rated current of current transformer
I>
= setting value of overload current (51)
I>>
= setting value of short-circuit current (50)
Io>
= setting value of earth fault current (first threshold) (51N)
Io>> = setting value of earth fault current (second threshold) (50N)
(1) If an external toroidal current transformer is used, recalculate the setting values according to its primary
rated current.
Current
Protection functions
transformer (CT)
In
I>
I>>
Io>
Io>>
[A]
0.2 ... 1 x In [A]
2.5 ... 20 x I> [A]
0.1 ... 1 x In [A]
(1)
2.5 ... 20 x Io> [A]
(1)
40
8 ... 40
20 ... 800
4 ... 40
10 ... 800
80
16 ... 80
40 ... 1600
8 ... 80
20 ... 1600
100
20 ... 100
50 ... 2000
10 ... 100
25 ... 2000
150
30 ... 150
75 ... 3000
15 ... 150
37.5 ... 3000
200
40 ... 200
100 ... 4000
20 ... 200
50 ... 4000
250
50 ... 250
125 ... 5000
25 ... 250
62.5 ... 5000
600
120 ... 600
300 ... 12000
60 ... 600
150 ... 12000
1250
250 ... 1250
625 ... 25000
125 ... 1250
32.5 ... 25000
Содержание PR512
Страница 1: ...Medium Voltage Products PR512 Microprocessor based self supplied protection relays ...
Страница 2: ......
Страница 4: ...2 ...
Страница 22: ...20 ...
Страница 33: ...31 7 Dimensions and fixing 32 OVERALL DIMENSIONS ...
Страница 42: ...40 ...
Страница 43: ......