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

Overcurrent relay energy management
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2.14 51N Time Delayed Derived Earth Fault

Reference

2.14.1
Parameter
Is
Setting
char
Characteristic setting
Tm
Time Multiplier setting
t
Delay setting
d
t
Reset setting
res
Applied Current
I
(for operate time)

Operate and Reset Level

2.14.2
Attribute
I
Operate level
op
Reset level
Repeatability
Variation

Operate and Reset Time

2.14.3
Attribute
Starter operate time (≥ 2xIs)
t
Operate time
op
Reset time
©2017 Siemens Protection Devices Limited
IDMTL
DTL
-10 °C to +55 °C
f
± 5 %
nom
char = IEC-NI,
IEC-VI,
IEC-EI,
IEC-LTI
char = ANSI-MI,
ANSI-VI,
ANSI-EI
char = DTL
ANSI DECAYING
7SR11 & 7SR12 Performance Specification
Value
0.05, 0.6... 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
2 to 20 x Is
5 x Is
Value
105 % Is, ± 4 % or ± 1% In
≥ 95 % I
op
± 1 %
≤ 5 %
≤ 5 %
Value
30 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 39 of 56

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