4 Technical Data
420
7UM62 Manual
C53000-G1176-C149-3
Influencing
Variables for
Pickup
Power Supply Direct Voltage in Range
0.8
≤
V
PS
/ V
PS nominal
≤
1.15
1 %
Temperature in Range
23 °F
≤ ϑ
amb
≤
131 °F
0.3 % / 10 °F
–5 °C
≤ ϑ
amb
≤
55 °C
0.5 % / 10 K
Frequency in Range
0.95
≤
f/f
N
≤
1.05
1 % (see also Figure 4-11)
Figure 4-8
Pickup Characteristic of the Transformer Differential Protection
Figure 4-9 Restraining Influence of 2nd Harmonics in Transformer Differential Protection
1
2
3
4
5
6
7
8
9
10 11 12
13 14 15 16 17 18
1
2
3
4
5
6
7
8
9
10
SLOPE 2
2031
I DIFF>>
2021
I DIFF>
BASE POINT 2
BASE POINT 1
Tripping
a
b
c
d
I
diff
I
N
---------
I
stab
I
N
------------
Fault characteristic
Blocking
Add-On Stabilization
SLOPE 1
0
0.1
0.2
0.3
0.4
0.5
0.2
0.5
0.1
1.0
10.0
5,0
2.0
Can be set to
e.g. 2ndharmonics = 15 %
Can be set to e.g.
I
DIFF
>/IN = 0.2
Can be set to e.g.
I
DIFF
>>/IN = 10
Trip-
ping
Blocking
I
2f
I
fN
I
fN
I
N
