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Chapter 6) 7SR158 Commissioning & Maintenance Guide
1.4
AC Analogue Energising Quantities
Voltage 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 Voltage.............
Measured
V
/V
A
AB
Secondary
Primary
Apply 3 phase balanced Voltage at nominal levels and ensure that the measured Zero Phase Sequence and
Negative Phase Sequence quantities are approximately zero.
Measured
ZPS
Voltage
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
Chapter 6 - Page 8 of 24
V
/V
V
B
BC
C
NPS
Measured
PU
Measured
Delay
/V
Tolerance
CB
Notes (method of initiation)
©2013 Siemens Protection Devices Limited
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