Chapter 6) 7SR23 DAD Commissioning & Maintenance Guide
©2013 Siemens Protection Devices Limited
Chapter 6 Page 8 of 26
1.3
Tests
1.3.1 Inspection
Ensure that all connections are tight and correct to the relay wiring diagram and the scheme diagram. Record any
deviations. Check that the relay is correctly programmed and that it is fully inserted into the case. Refer to
‘
Section 2: Settings and Instruments’ for information on programming the relay.
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
For all high current tests it must be ensured that the test equipment has the required rating and stability and that
the relay is not stressed beyond its thermal limit.
1.3.3 Primary Injection Tests
Primary injection tests are essential to check the ratio and polarity of the current transformers as well as the
secondary wiring. Primary injection testing of the 87/50 Differential protection is recommended to avoid relay
operation during first energisation of the busbar if circuit connections have been incorrectly installed.
Differential current flowing in the relay circuit can be checked by examination of the relay Current Meters in the
Instruments Menu when the protected plant is carrying load but Earth Fault CT polarity can only be checked
during primary injection.
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 m.c.b.
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.
Summary of Contents for 7SR23 DAD
Page 1: ...Answers for energy 7SR23 DAD High Impedance Protection Relay Reyrolle Protection Devices ...
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Page 4: ...7SR23 DAD Contents 2013 Siemens Protection Devices Limited ...
Page 60: ...Chapter 3 7SR23 DAD Performance Specification 2013 Siemens Protection Devices Limited ...
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