Siemens 7SR105 Rho - Page 90

7SR105 Rho Performance Specification
© 2018 Siemens Protection Devices Chapter 3 Page 14 of 17
Table 1-21 46 Phase Unbalance Protection
Number of Elements 1 (Magnitude difference or NPS)
Setting Range Is 0.1 to 0.4 x Itheta
Operate Level 100 % I
s
± 5 % or ± 1 %xI
n
IT Min. Operate Time 0 s to 20 s
DT Delay Setting td 0 s to 20 s
DT Basic Operate Time for NPS -
2 x I
s
5 x I
s
65 ms ± 10 ms
60 ms ± 10 ms
DT Basic Operate Time for magnitude -
2 x I
s
5 x I
s
60 ms ± 10 ms
50 ms ± 10 ms
DT Operate time following delay. td ± 1 % or ± 30 ms
Tm Time Multiplier 0.025 to 2.0
Disengaging time < 80 ms
Inhibited by Binary or Virtual Input
Table 1-22 48/66 Start Protection
Max. No. of Starts OFF, 1 to 20
Max. Starts Period 1 to 60 min
Start Inhibit Delay 1 to 60 min
Time Between Starts OFF, 1 to 60 min
Table 1-23 49 Thermal Protection
Setting Range Itheta 0.1 to 3.0xI
n
NPS Weighting Factor (K)
0.1 to 10.0 ∆ 0.1
TauH Heating Constant
0.5 to 1000 min, ∆ 0.5 min
TauS Starting Constant
0.005 to 1.0 x TauH , ∆ 0.005
TauC Cooling Constant
1 to 100 x TauH , ∆ 1
Hot/cold ratio
OFF, 1 to 100 %, ∆ 1 %
Operate Level 100 % I
s
, ± 5 % or ±1 %xI
n
Operate time














−






−−
×=
22
22
1
θ
τ
I
I
I
C
H
I
Int
EQ
pEQ
± 5 % or ± 100 ms
(Itheta = 0.3 to 3xI
n
)
(1.2 to 20 x Itheta)
User defined
Capacity Alarm Level Disabled, 50,51…100 %
Load Alarm Level
OFF, 0.5 to 1.0 x Itheta , ∆ 0.05
Thermal restart inhibit
20 to 100 %, ∆ 1 %
Inhibited by Binary or Virtual Input