Siemens 7SG164 Ohmega 400 Series Manual page 109

Energise status input CB Manual Close, then repeat the test. Ensure that the fault is initiated within 400 ms of
energisation of the status input
Status Input
Low
High
Ensure that with the status input low the relay trips as normal (after the relevant time delay) and with the status
input high, the relay trips instantaneously with a SOTF indication.
4.3 Voltage Transformer Supervision VTS Tests.
VTS ENABLED
4.3.1 Residual Voltage and Current detector.
Apply nominal voltage level on three phases and ramp down one of them until a VTS indication appears. Next,
gradually increase the current on the same phase until the VTS indication drops off. Record these values in the
"Measured pick-up level" column in the table below.
VTS Ires Level
VTS Vres Level
Calc. volts pick-up = [Vn] – [VTS Vres Level]=
Calc. Curr. Pick-up = [In]- [VTS Ires Level] =
Phase Action
A Voltage to operate/reset
Current to operate/reset
B Voltage to operate/reset
Current to operate/reset
C Voltage to operate/reset
Current to operate/reset
Ensure that the VTS picks up at the correct level.
©2010 Siemens Protection Devices Limited
Fault Measured
Type Time (ms)
A-E
A-E
DISABLED
=
=
7SG16 Ohmega 402 60 Commissioning
Operating Relay Indication
A-E
A-E
A
V
Calculated
Pick-up level
V
A
V
A
V
A
TRIP
SOTF
Checked
OK
Measured
Pick-up level
V
A
V
A
V
A
Checked
OK
Chapter 9 Page 11 of 19
V
A