51Sef Time Delayed Sensitive Earth Fault; Reference; Operate And Reset Level; Operate And Reset Time - Siemens 7SR12 Argus Manual

2.15 51SEF Time Delayed Sensitive Earth Fault

Reference

2.15.1
Parameter
Is Setting
char Characteristic setting
Tm Time multiplier
t Delay setting
d
t Reset setting
res
Applied Current
I
(for operate time)

Operate and Reset Level

2.15.2
Attribute
I Operate level
op
Reset level
Repeatability
Variation

Operate and Reset Time

2.15.3
Attribute
Starter operate time
t Operate time
op
©2017 Siemens Protection Devices Limited
Value
0.005, 0.006,0.010,0.105,... 5.0 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
0.00...20.00 s
DECAYING, 0, 1...60 s
IDMTL 2 to 20 x Is
DTL 5 x Is
Value
105 % Is, ± 4 % or ± 1% In
95 % I
± 1 %
≤ 5 %
-10 °C to +55 °C
f ± 5 %
nom
≤ 5 %
harmonics to f
cutoff
Value
20 ms, ± 20ms
t
op
char = IEC-NI,
IEC-VI,
IEC-EI,
for char =
IEC-LTI
t
op
char = ANSI-MI,
ANSI-VI,
ANSI-EI, (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
7SR11 & 7SR12 Performance Specification
± 4 % or ± 1% In
op
K
= ×
, ± 5 % absolute or ± 30 ms,
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
 
= + ×
, ± 5 % absolute or ± 30 ms,
[ ] B Tm
 
P
−
I
1
 
Is
ANSI-VI : A = 19.61, B = 0.491, P = 2.0
ANSI-EI : A = 28.2, B = 0.1217, P = 2.0
Chapter 3 Page 41 of 56