Ac Analogue Energising Quantities; Binary Inputs - Siemens 7SR12 Argus Manual

1.4

AC Analogue Energising Quantities

Voltage and current measurement for each input channel is displayed in the Instrumentation Mode sub-menus,
each input should be checked for correct connection and measurement accuracy by single phase secondary
injection at nominal levels. Ensure that the correct instrument displays the applied signal within limits of the
Performance Specification.
Applied Current........................
I
A
Secondary
Primary
Apply 3 phase balanced Current and Voltage at nominal levels and ensure that the measured Zero Phase
Sequence and Negative Phase Sequence quantities are approximately zero.
Voltage
Current
If Phase Rotation ACB is selected in the CT/VT Config menu, this corresponds to negative phase sequence and
the NPS and PPS will be exchanged.
1.5

Binary Inputs

The operation of the binary input(s) can be monitored on the 'Binary Input Meters' display shown in 'Instruments
Mode'. Apply the required supply voltage onto each binary input in turn and check for correct operation.
Depending on the application, each binary input may be programmed to perform a specific function; each binary
should be checked to prove that its mapping and functionality is as set as part of the Scheme Operation tests.
Where the pick-up timers associated with a binary input are set for DC operation these delays should be checked
either as part of the scheme logic or individually. To check a binary pick-up time delay, temporarily map the binary
input to an output relay that has a normally open contact. This can be achieved in the Output Matrix sub-menu by
utilising the BI n Operated settings. Use an external timer to measure the interval between binary input
energisation and closure of the output contacts. Similarly, to measure the drop-off delay, map the binary input to
an output relay that has a normally closed contact, time the interval between binary input de-energisation and
closure of the output contacts.
For AC operation of binary inputs, these timers are used to ensure correct operation from AC voltage and if a
delayed pickup is required this must be provided by additional quicklogic configuration. An example is shown in
Chapter 7 – Applications Guide.
Note. The time measured will include an additional delay, typically less than 20ms, due to the response time of
the binary input hardware, software processing time and the operate time of the output relay.
BI Tested DO
Delay
1
2
3
4
5
6
©2017 Siemens Protection Devices Limited
I I I
B C G/SEF
ZPS
Measured PU Measured
Delay
7SR11 & 7SR12 Commissioning and Maintenance Guide
Applied Voltage.............
Tol V /V V /V
A AB B BC
Notes (method of initiation)
V /V Tolerance
C CB
NPS
Chapter 6 Page 9 of 72