PRS-7910
46 PRS-7910
measurements are within the stated tolerances.
If the application-specific settings have been applied to the relay prior to commissioning, it is
advisable to make a copy of the settings so as to allow them restoration later. This could be done
by extracting the settings from the relay itself via printer or manually creating a setting record.
This relay is fully numerical and the hardware is continuously monitored. Commissioning tests can
be kept to a minimum and need only include hardware tests and conjunctive tests. The function
tests are carried out according to user's correlative regulations.
The following tests are necessary to ensure the normal operation of the equipment before it is first
put into service.
Hardware tests
These tests are performed for the following hardware to ensure that there is no hardware defect.
Defects of hardware circuits other than the following can be detected by self-monitoring when the
power supply is energized.
• User interfaces test
• Binary input circuits and output circuits test
• AC input circuits test
• Function tests
These tests are performed for the following functions that are fully software-based. Tests of the
protection schemes and fault locator require a dynamic test set.
• Measuring elements test
• Timers test
• Metering and recording test
• Conjunctive tests
The tests are performed after the relay is connected with the primary equipment and other external
equipment.
• On load test.
• Phase sequence check and polarity check.
10.4.1 With the Relay De-energized
10.4.1.1 Visual Inspection
After unpacking the product, check for any damage to the relay case. If there is any damage, the
internal module might also have been affected, contact the vendor. The following listed items are
necessary.
• Protection panel
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