Secondary Injection Tests; Primary Injection Tests; Putting Into Service; Ac Analogue Energising Quantities - Siemens 7SR157 Argus Manual

1.3.2

Secondary Injection Tests

Select the required relay configuration and settings for the application.
Isolate the auxiliary D.C. supplies for alarm and tripping from the relay and remove the trip and intertrip links.
Carry out injection tests for each relay function, as described in this document
1.3.3

Primary Injection Tests

Primary injection tests are essential to check the ratio and polarity of the transformers as well as the secondary
wiring.
1.3.4

Putting into Service

After tests have been performed satisfactorily the relay should be put back into service as follows:-
Remove all test connections.
Replace all secondary circuit fuses and links, or close miniature circuit breaker (MCB).
Ensure the Protection Healthy LED is on, steady, and that all LED indications are correct. If necessary press
CANCEL until the Relay Identifier screen is displayed, then press TEST/RESET to reset the indication LEDs.
The relay meters should be checked in Instruments Mode with the relay on load.
The relay settings should be downloaded to a computer and a printout of the settings produced. The installed
settings should then be compared against the required settings supplied before testing began. Automated setting
comparison can be carried out by Reydisp using the Compare Settings Groups function in the Edit menu. Any
modified settings will be clearly highlighted.
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.
V Line Secondary
Primary
V Bus Secondary
Primary
Note: Instrument tolerance is: ± 1 % Vn (0.1 x Vn ≤ V ≤ 1.2 x Vn).
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 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 it's 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.
The timers are also used to ensure correct operation of Binary Inputs from AC voltage energisation. If a delayed
pickup is required, this must be provided by additional Quick Logic configuration. An example is shown in Chapter
7 – Applications Guide.
Chapter 6 - Page 5 of 14
Chapter 6 - 7SR157 Commissioning and Maintenance Guide
Applied Sec Tolerance
Volts (Vrms)
Line VT Ratio:
Bus VT Ratio:
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