7SR21 & 7SR22 Performance Specification
Unrestricted © 2013 Siemens Protection Devices Limited Page 11 of 68
1.2.1.3 Operational Features
Attribute Value
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 Withstand Period, will
During conditions of auxiliary input voltage variations which are not described
in section 1.4.3.1, 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 Current
Nominal Measuring Range
In 1 A, 5 A Phase and earth 80 x In
fn 50 Hz, 60 Hz 47 Hz to 62 Hz
Sample Rate 32 cycles / sec @ 50 Hz
Note. 1 A and 5 A nominal inputs are user selectable on each model.
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