Time Delayed Measured Earth Fault; Reference; Operate And Reset Level; Operate And Reset Time - Siemens 7SR12 Argus Manual

2.13 51G Time Delayed Measured Earth Fault

Reference

2.13.1
Parameter
Is Setting
Char Characteristic setting
Tm
Time Multiplier setting
t Delay setting (DTL)
d
t
Reset setting
res
Applied current (for
I
operate time)

Operate and Reset Level

2.13.2
Attribute
I Operate level
op
Reset level
Repeatability
-10 °C to +55 °C
Variation
f
nom

Operate and Reset Time

2.13.3
Attribute
Starter operate time (≥ 2xIs)
t Operate time
op
Reset time
©2017 Siemens Protection Devices Limited
Value
0.05, 0.06... 2.5 xIn
IEC-NI, -VI, -EI, -LTI;
ANSI-MI, -VI, -EI; DTL
IEC: 0.025, 0.030... 1.6
ANSI: 0.025, 0.030... 1.6 1.7... 5, 6... 15
0, 0.01... 20 s
ANSI DECAYING, 0, 1... 60 s
IDMTL 2 to 20 xIs
5 xIs
DTL
Value
105 % Is, ± 4 % or ± 1% In
≥ 95 % I
± 1 %
≤ 5 %
≤ 5 %
± 5 %
char = IEC-NI,
IEC-VI,
IEC-EI,
IEC-LTI
char = ANSI-MI,
ANSI-VI,
ANSI-EI
char = DTL
ANSI DECAYING
7SR11 & 7SR12 Performance Specification
op
Value
20 ms, ± 20ms
K
= ×
, ± 5 % absolute or ± 30 ms,
t Tm
[ ]
α
op
−
I
1
Is
IEC-NI : K = 0.14, α = 0.02
for char =
IEC-VI : K = 13.5, α = 1.0
IEC-EI : K = 80.0, α = 2.0
IEC-LTI : K = 120.0, α = 1.0
 
A
 
= + ×
t [ ] B Tm
 
op
P
−
I
1
 
Is
(ANSI-EI +5% -10 % absolute for I/Is>10 with TMS >2)
for char = ANSI-MI : A = 0.0515, B = 0.114, P = 0.02
ANSI-VI : A = 19.61, B = 0.491, P = 2.0
ANSI-EI : A = 28.2,
, ± 1 % or ± 20ms
t
d
R
= ×
, ± 5 % absolute or ± 30 ms,
t Tm
[ ]
−
res
2
I
1
Is
for char = ANSI-MI : R = 4.85
ANSI-VI : R = 21.6
ANSI-EI : R = 29.1
, ± 5 % absolute or ± 30 ms,
B = 0.1217, P = 2.0
Chapter 3 Page 37 of 56