Siemens Argus 7SR21 Technical Manual page 580

7SR210 & 7SR220 Commissioning & Maintenance Guide
3.2.1 1 or 2 Phase VT fail
Apply 3P balanced nominal current and voltage. Reduce 1 phase voltage until VTS operates, record voltage
reduction level.
60VTS V Setting
Increase the voltage until VTS resets. Increase current on 1 phase by 110 % of 3x the 60VTS I setting. Reduce
voltage as above and check for no operation. Return voltage to nominal. Increase current on 1 phase by 90 % of
3x the 60VTS I.setting. Reduce voltage as above and check for VTS operation.
60VTS I Setting
3.2.2 3 Phase VT fail
Apply 3P balanced nominal voltage and 3P balanced current at a level between the 60VTS Ipps Load setting and
the 60VTS Ipps Fault setting. Reduce the balanced Voltage on all 3 phases until the VTS operates at the 60VTS
Vpps setting. Return the voltage to nominal and ensure that VTS resets.
Reduce the 3P balanced current to a level below the 60VTS Ipps Load setting. Reduce the 3P balanced voltage
to a level below the operate level above. Gradually increase the 3P balanced current until the VTS operates.
Check that the thermal rating of the relay current inputs is not exceeded during the following test. Increase the 3P
balanced current to a level above the 60VTS Ipps Fault setting. Reduce the 3P balanced voltage to a level below
the operate level above. Gradually reduce the 3P balanced current until the VTS operates.
60VTS Vpps
60VTS Ipps Load
60VTS Ipps Fault
If the VTS can be started from a status input fed from an external source, this functionality should be tested.
Ext_Trig 60VTS Operation
1.1.1.1 Element Blocking
The VT Supervision can be blocked by Binary Input Inhibit. This functionality should be checked.
Element
60VTS
Page 68 of 82
Setting x 3
Setting x 3 110% of Setting x 3
Setting
Not Applicable.
Measured Voltage Reduction
90% of Setting x 3
No VTS. □
Measured
BI Inhibits
© 2013 Siemens Protection Devices Limited
VTS operation.□