Specifications

7SR242 Duobias Performance Specification
©2010 Siemens Protection Devices Limited Chapter 3 - Page 14 of 45
Section 2: Protection Functions
2.1 24 Over Fluxing
2.1.1 Reference (24DT)
Parameter Value
V/f
s
Setting 0.10, 0.11… 2.0 x Nominal Voltage / Nominal Frequency
Hyst
Hysteresis setting 0, 0.1… 80.0%
t
d
Delay setting
0.00, 0.01…20.00, 20.50… 100, 101… 1000, 1010… 10000,
10100… 14400 s
2.1.2 Operate and Reset Level (24DT)
Attribute Value
V/f
op
Operate level
100% x V/f
s
, r 2 % or r 0.02
Reset level  95% of V/f
op
Repeatability
r 1 %
Variation -10 °C to +55 °C
d 5 %
2.1.3 Operate and Reset Time (24DT)
Attribute Value
0.9 to 1.1 x V/f
s
: 400 ms r 200ms
t
basic
Element basic operate time
0.9 to 2.0 x V/f
s
: 320 ms r 200ms
t
op
Operate time following delay
t
basic
+ t
d
, r 1 % or r 200ms
Repeatability
r 1 %
Disengaging time < 250ms
2.1.4 Reference (24IT)
Parameter Value
t
reset
Reset setting 0, 1… 1000 s
2.1.5 Operate and Reset Level (24IT)
Attribute Value
V/f
op
Operate level
100% x V/f
s
, r 2 % or r 0.02
Reset level  95% of V/f
op
Repeatability
r 1 %
Variation -10 °C to +55 °C
d 5 %