Gradually reduce the 3 Phase current until the element resets.
Setting
Measured
60CTS-I Delay
60CTS-I I
2
60CTS-I V
2
Element Blocking
The
CT Supervision
function can be blocked by Binary Input Inhibit. This functionality should be checked.
Element
BI Inhibits
60CTS
60VTS VT Supervision
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
Setting ⋅ 3
Measured Voltage Reduction
Increase the voltage until VTS resets. Increase current on 1 phase by 110 % of 3 times 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 3 times the
60VTS I
setting. Reduce voltage as above and check for VTS operation.
60VTS I Setting
Setting ⋅ 3
110 % of Setting ⋅ 3
90 % of Setting ⋅ 3
3 Phase VT Fail
Apply 3P balanced nominal voltage and 3P balanced current at a level between the 60VTS I
1
Load setting and
the 60VTS I
1
Fault setting. Reduce the balanced voltage on all 3 phases until the VTS operates at the 60VTS V
1
setting. Return the voltage to nominal and ensure that VTS resets.
Reduce the 3P balanced current to a level below the 60VTS I
1
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 I
1
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.
Setting
Measured
60VTS V
1
60VTS I
1
Load
60VTS I
1
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
Not Applicable
Element Blocking
The
VT Supervision
can be blocked by Binary Input Inhibit. This functionality should be checked.
Element
BI Inhibits
60VTS
9.11.3
Functional Tests
9.11 Supervision Functions
452
Reyrolle 7SR5, Transformer Protection Device, Device Manual
C53000-G7040-C015-1, Edition 11.2019