7SR11 & 7SR12 Performance Specification
ยฉ2017 Siemens Protection Devices Limited Chapter 3 Page 46 of 56
2.19 59N Neutral Voltage Displacement
2.19.1 Reference (59NDT)
Parameter Value
Vs
Setting 1.0, 1.5 ... 100V
t
d
Delay setting 0.00, 0.01โฆ20.00 s
2.19.2 Operate and Reset Level (59NDT)
V
op
Operate level
100 % Vs, ยฑ 2 % or ยฑ 0.5 V
Reset level
โฅ 95 % V
op
or ยฑ 0.5 V
Repeatability
ยฑ 1 %
Variation
-10 ยฐC to +55 ยฐC
โค 5 %
f
nom
ยฑ 5 %
โค 5 %
2.19.3 Operate and Reset Time (59NDT)
t
basic
Element basic operate time
0V to 1.5 xVs, 76 ms, ยฑ 20ms
0V to 10 xVs, 63 ms, ยฑ 20ms
t
op
Operate time following delay
t
basic
+ t
d
, ยฑ 1 % or ยฑ 20ms
Repeatability
ยฑ 1 % or ยฑ 20ms
Overshoot time < 40 ms
Disengaging time <100 ms
2.19.4 Reference (59NIT)
Parameter Value
M
Time Multiplier setting 1
Vs
Setting 1, 1.5โฆ 100V
3V
o
Applied Current (for Operate-Time)
IDMTL
2 x Vs
t
d
Delay setting 0, 0.01โฆ 20 s
t
res
Reset setting 0, 1โฆ60 s
2.19.5 Operate and Reset Level (59NIT)
Attribute Value
V
op
Operate level
100 % Vs, ยฑ 2 % or ยฑ 0.5 V
Reset level
โฅ 95 % V
op
or ยฑ 0.5 V
Repeatability
ยฑ 1 %
Variation
-10 ยฐC to +55 ยฐC
โค 5 %
f
nom
ยฑ 5 %
โค 5 %
Operate and Reset Time (59NIT)
Attribute Value
t
basic
Starter operate time
65 ms, ยฑ 20ms
3V
o
Applied Current (for Operate-Time)
DTL
10 x Vs