51Sef Time Delayed Sensitive Earth Fault; Reference; Operate And Reset Level; Operate And Reset Time - Siemens 7SR10 Argus Series Manual

2.15 51SEF Time Delayed Sensitive Earth Fault

2.15.1 Reference

Parameter
Is Setting
char Characteristic setting
Tm Time multiplier
t Delay setting
d
t Reset setting
res
Applied Current
I
(for operate time)

2.15.2 Operate and Reset Level

Attribute
I Operate level
op
Reset level
Repeatability
Variation

2.15.3 Operate and Reset Time

Attribute
Starter operate time
t Operate time
op
© 2018 Siemens Protection Devices Limited
Value
0.005, 0.006,...0.1, 0.105, 0.110...0.5xI
IEC-NI, -VI, -EI, -LTI;
ANSI-MI, -VI, -EI; DTL
0.01, 0.015,... 1.6, 1.7,...5, 6,...100
0.00...20.00 s
DECAYING, 0, 1...60 s
IDMTL 2 to 20xI
DTL 5xI
Value
105 % I
95 % I
± 1 %
-10 °C to +60 °C ≤ 5 %
f ± 5 %
nom
≤ 5 %
harmonics to f
cutoff
Value
20 ms, ± 20 ms
t
op
char = IEC-NI,
± 5 % absolute or ± 40 ms for TMS setting (0.01 to 0.245)
IEC-VI,
± 5 % absolute or ± 30 ms for TMS setting (0.25 to 100)
IEC-EI,
IEC-LTI
for char =
t
op
char = ANSI-MI,
ANSI-VI,
± 5 % absolute or ± 40 ms for TMS setting (0.01 to 0.245)
ANSI-EI,
± 5 % absolute or ± 30 ms for TMS setting (0.25 to 100)
for char = ANSI-MI : A = 0.0515, B = 0.114, P = 0.02
s
s
, ± 4 % or ± 1 % I
s n
± 4 % or ± 1 % I
op n
K
= × Tm
,
[ ]
α
I
− 1
Is
IEC-NI : K = 0.14, α = 0.02
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
 
= + B × Tm
,
[ ]
 
P
I
− 1
 
Is
ANSI-VI : A = 19.61, B = 0.491, P = 2.0
ANSI-EI : A = 28.2,
7SR10 Performance Specification
n
B = 0.1217, P = 2.0
Chapter 3 Page 38 of 52