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
74CC/74TC Close/Trip Circuit Supervision
The T/CCS-n Delay can be initiated by applying an inversion to the relevant status input and measured by
monitoring of the alarm output. Operation of the alarm output should be checked.
TCS-n Delay Setting Measured
CCS-n Delay Setting Measured
Check that the switching threshold of the binary inputs is configured to be below half the rated value of the
control voltage if the advanced arrangement is installed where 2 inputs are energized in series in the CB open
condition.
Check that the binary inputs used are correctly isolated from other input circuits, particularly for the advance 2
input schemes.
If resistors are installed in the scheme, check that they are present, the correct value and connected correctly.
Resistors are not necessary for scheme operation but can be specified to provide additional security if compo-
nent failure results in a short circuit.
81HB2 Inrush Current Detection
Logical operation of the harmonic blocking can be tested by current injection at 100 Hz for 50 Hz devices or
120 Hz for 60 Hz devices to cause operation of the blocking signals. No fundamental frequency is required.
To test the pickup setting of the 81HB2 element it is necessary to inject both fundamental frequency and
second harmonic current into the same phase input by parallel sources or more advanced test equipment that
supports that functionality.
Current setting is defined as a percentage of the total current and therefore for a setting of 0.20 ⋅ I the
threshold will be found at 0.25 ⋅ rated current 2nd harmonic if 1.0 ⋅ rated current fundamental is injected i.e.
[fo_function81HB2FunctionalTests, 1, en_US]
Current Expected Measured
I
f
1 ⋅ I
rated
I
2f
9.10.4
9.10.5
Functional Tests
9.10 Supervision Functions
Reyrolle 7SR5, Overcurrent Protection Device, Device Manual 499
C53000-G7040-C014-1, Edition 11.2019
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