Ac Analogue Current; Ac Analogue Voltage - Siemens 7SR18 Solkor Manual

1.2.1.2 Operational Features
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 A & 5 A Phase and Earth
fn 50 Hz or 60 Hz
Note. 1 A and 5 A nominal inputs are user selectable on each model.
1.2.2.1 Burden
Attribute
AC Burden
Input Impedance (typical)
1.2.2.2 Thermal Withstand
Overload Period
Continuous (1 hour)
3 minutes
2 minutes
3 seconds
2 seconds
1 second
1 cycle
1.2.3

AC Analogue Voltage

Attribute Nominal
Vn 40 to 160 Vrms
fn 50, 60Hz
Unrestricted ©2018 Siemens Protection Devices Limited
Value
50 ms
5 minutes
0 % Dip With stand Period will invoke a relay reset.
Measuring Range
80 x In
47.5 Hz to 52.5 Hz and 57 Hz to 63 Hz
Value – Phase and Earth
1 A
≤ 0.1 VA
0.05 Ω
1 A
57.7 A
70.7 A
100 A
700 A
Operating Range
0 to 200 Vrms
47.5 to 52.5Hz and 57 to 63Hz
7SR18 Performance Specification
Comments
Typical time after switch on to
attain claimed immunity to dips
(1)
in section 1.6.3.1, the relay
5 A
≤ 0.3 VA
0.01 Ω
Overload Current
Phase and Earth
5 A
4.0 xIn
5.0 xIn
6.0 xIn
202 A
247 A
350 A
2500 A
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