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Operational Features
1.2.1.2
Attribute
0% Dip Withstand Period
Dip Immunity Acquisition Period
NOTE: Dips in supply that fall below the minimum voltage for a period greater than the
During conditions of auxiliary input voltage variations which are not described
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
In
1, 5 A Phase and SEF
fn
50, 60Hz
Note. 1A and 5A nominal inputs are user selectable on each model.
Burden
1.2.2.1
Attribute
AC Burden
Input Impedance (typical)
Thermal Withstand EATS48-5
1.2.2.2
Overload Period
Continuous
1 second
©2014 Siemens Protection Devices Limited
Value
50ms
5minutes
0% Dip With stand Period will invoke a relay reset.
Measuring Range
80 x In
47.5 to 52.5Hz and 57 to 63Hz
Value - Phase and SEF
Chapter 3) 7SR17 Rho Performance Specification
Comments
Typical time after switch on to
attain claimed immunity to dips
(1)
in section 1.4.3.1, the relay
1A
0.1 VA
0.05
Overload Current
Phase and SEF
1A
4.0 xIn
100A
5A
0.3 VA
0.01
5A
350A
Chapter 3 Page 9 of 46
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