7SR18 Performance Specification
Unrestricted ©2018 Siemens Protection Devices Limited Page 7 of
1.2.1.2 Operational Features
Attribute Value
Comments
0 % Dip Withstand Period 50 ms
Dip Immunity Acquisition Period 5 minutes
Typical time after switch on to
attain claimed immunity to dips
NOTE: Dips in supply that fall below the minimum voltage for a period greater than the
0 % Dip With stand Period will invoke a relay reset.
During conditions of auxiliary input voltage variations which are not described
in section 1.6.3.1, the relay
may enter a safety protection mode where a power supply shutdown occurs. This condition is designed to
protect the power supply from damage as well as prevent internal relay faults from developing into dangerous
situations. Once the relay has entered this safety mode, it may be necessary to reduce the auxiliary input
voltage to zero volts for up to 30 seconds before re-application of the auxiliary supply will cause the relay to
power up and operate normally.
(1) Using fuses as on/off switches or allowing batteries to run at very low cell voltages for extended periods and
then attempting to re-charge them, are examples of such auxiliary supply conditions.
1.2.2 AC Analogue Current
Nominal Measuring Range
In 1 A & 5 A Phase and Earth 80 x In
fn 50 Hz or 60 Hz 47.5 Hz to 52.5 Hz and 57 Hz to 63 Hz
Note. 1 A and 5 A nominal inputs are user selectable on each model.
1.2.2.1 Burden
1.2.2.2 Thermal Withstand
Overload Period
Overload Current
Phase and Earth
1 A 5 A
Continuous (1 hour) 4.0 xIn
3 minutes 5.0 xIn
2 minutes 6.0 xIn
3 seconds 57.7 A 202 A
2 seconds 70.7 A 247 A
1 second 100 A 350 A
1 cycle 700 A 2500 A
1.2.3 AC Analogue Voltage
Attribute Nominal Operating Range
Vn 40 to 160 Vrms 0 to 200 Vrms
fn 50, 60Hz 47.5 to 52.5Hz and 57 to 63Hz
Attribute
Value – Phase and Earth
1 A 5 A
AC Burden ≤ 0.1 VA ≤ 0.3 VA
Input Impedance (typical) 0.05 Ω 0.01 Ω
To Next Page
Loading...
