Siemens 7SR45 Argus User Manual page 35

Table 3-8
Curve type
IEC-NI 0.14
IEC-VI 13.5
IEC-EI 80
IEC-LTI 120
IEEE/ANSI - MI ----
IEEE/ANSI - VI ----
IEEE/ANSI - EI ----
Where,
I - Fault current Magnitude
I - Pickup setting
s
Tm - Time multiplier
Table 3-9
Parameters Description
Gn 51G-n
51G-1 Block
Element
Gn 51G-n
Pick-up current
Setting
Gn 51G-n Char Characteristics
Time Multiplier
Gn 51G-n Time
Mult
(other than DTL)
Delay
Gn 51G-n Delay (Applicable only for
DTL)
Gn 51G-n Min Minimum Operate
Operate Time
Gn 51G-n
Follower DTL
Follower DTL
Gn 51G-n Reset Reset
©2018 Siemens Protection Devices Limited
Constants for operating and reset curve characteristics
Operating time
K α P
0.02 ----
1.0 ----
2.0 ----
1.0 ----
---- 0.02
---- 2.0
---- 2.0
Time Delayed Measured Earth Fault Protection (51G-n)
Default Value
Disabled
0.5xI
n
IEC NI
1
5 s
0 s
0 s
0 s
Chapter 1 - 7SR45 Description of Operation
A B
---- ----
---- ----
---- ----
---- ----
0.0515 0.114
19.61 0.491
28.2 0.1217
Min Max
- -
0.06xIn 0.80xI
n
- -
0.01 10
0 s 15 s
0 s 20 s
0 s 20 s
60, IEC/
0 s ANSI
DECAY
Reset time
R n
9.7 2
43.2 2
58.2 2
80 2
4.85 2
21.6 2
29.1 2
Step Change
-
0.01
-
0.01
0.01
0.01
0.01
0.01
Chapter 1 Page 32 of 48