Gradually reduce the 3 Phase current until the element resets.
Setting Measured
60CTS-I Delay
60CTS-I I
2
Setting
60CTS-V CT Supervision – Voltage Reference
The presence of NPS current without NPS voltage is used to indicate a current transformer failure.
Apply normal 3P balanced current with a crossover of any 2 phases at a level above 60CTS-V I
2
setting.
Measure the delay to operation.
Apply 3P balanced voltage with a similar phase crossover to the current. Increase the applied 3P voltage until
the CTS-V element resets.
Reduce the 3P voltage to cause CTS-V operation again. Gradually reduce the 3P current until the element
resets.
Setting Measured
60CTS-V Delay
60CTS-V I
2
60CTS-V 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.
9.10.3
Functional Tests
9.10 Supervision Functions
498 Reyrolle 7SR5, Overcurrent Protection Device, Device Manual
C53000-G7040-C014-1, Edition 11.2019
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