MSCDN – MP2A Performance Specification
Operating Time
Characteristic Ranges
IEC
IDMTL
CURVES
Operate times are calculated from:
[ ]
⎥
⎥
⎦
⎤
⎢
⎢
⎣
⎡
−
×
=
1
α
Is
I
K
Tm
t
I = fault current
Is = current setting
Tm = time multiplier
NI: K = 0.14,
α
= 0.02
VI: K = 13.5,
α
= 1.0
EI: K = 80.0,
α
= 2.0
LTI: K = 120.0,
α
= 1.0
Time Multiplier
0.025 to 1.600
Δ
0.025 sec
Reset
0.0 to 60.0
Δ
1.0 sec
ANSI
IDMTL
CURVES
Operate times are calculated from:
[ ]
⎥
⎥
⎦
⎤
⎢
⎢
⎣
⎡
+
−
×
=
B
A
M
t
P
Is
I
1
I = fault current
Is = current setting
M = time multiplier
MI: A = 0.0515, B = 0.114, P = 0.02
VI: A = 19.61, B = 0.491, P = 2.0
EI: A = 28.2, B = 0.1217, P = 2.0
ANSI
RESET
CURVES
Operate times are calculated from:
[ ]
⎥
⎥
⎦
⎤
⎢
⎢
⎣
⎡
−
×
=
1
2
Is
I
R
M
t
I = fault current
Is = current setting
M = time multiplier
MI: R = 4.85
VI: R = 21.6
EI: R = 29.1
4.12 27 Undervoltage
Single phase definite time undervoltage element. An under voltage guard element may be used to block this
elements operation.
Accuracy
Pickup
100% of setting ± 0.1% or ± 0.1 V
Reset
≤
100.5% of V
s
(Adjustable)
Repeatability ±
0.1%
Operate Time
± 1% or ± 20ms
Frequency Range
1
st
, 2
nd
…15
th
Harmonic
Operating Time
Operate Time
< 3 cycles
4.13 59DT Definite Time Overvoltage
Three phase definite time overvoltage element
Accuracy
Pickup
100% of setting ± 0.1% or ± 0.1 V
Reset
≥
99.5% of V
s
Repeatability ±
0.1%
Frequency Range
1
st
, 2
nd
…15
th
Harmonic
Operating Time
Operate Time
< 4 cycles
©2011 Siemens Protection Devices Limited
Chapter 2 Page 12 of 13
