PRS-7910
48 PRS-7910
To unplug all the terminals sockets of this relay, and do the insulation resistance test for each
circuit above with an electronic or brushless insulation tester.
On completion of the insulation resistance tests, ensure all external wiring is correctly reconnected
to the protection.
10.4.1.3 External Wiring
Check that the external wiring is correct to the relevant relay diagram and scheme diagram.
Ensure as far as practical that phasing/phase rotation appears to be as expected.
Check the wiring against the schematic diagram for the installation to ensure compliance with the
customer's normal practice.
10.4.1.4 Auxiliary Power Supply
The relay only can be operated under the auxiliary power supply depending on the relay’s nominal
power supply rating.
The incoming voltage must be within the operating range specified above, before energizing the
relay, measure the auxiliary supply to ensure it within the operating range.
Other requirements to the auxiliary power supply are specified above. See this section for further
details about the parameters of the power supply.
NOTICE!
Energize this relay only when the power supply is within the specified operating ranges.
10.4.2 With the Relay Energized
The following groups of checks verify that the relay hardware and software is functioning correctly
and should be carried out with the auxiliary supply applied to the relay.
The current and voltage transformer connections must remain isolated from the relay for these
checks. The trip circuit should also remain isolated to prevent accidental operation of the
associated circuit breaker.
10.4.2.1 Front Panel LCD Display temperatures.
For this purpose, this relay has an automatic “LCD contrast” adjusting feature, which is capable to
adjust LCD contrast automatically according to the ambient brightness.
Connect the relay to DC power supply correctly and turn the relay on. Check program version and
forming time displayed in command menu to ensure that are corresponding to what ordered.
10.4.2.2 Date and Time
If the time and date is not being maintained by substation automation system, the date and time
should be set manually.
Set the date and time to the correct local time and date using menu item “Clock”.
In the event of the auxiliary supply failing, with a super capacitor (ultra capacitor) fitted on CPU
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