Manual MRR1 GB
Woodward
DOK-TD-MRR1 Rev.A
17
6. Relay testing and commissioning
The following test instructions should help to verify the protection relay performance before or dur-
ing commissioning of the protection system. To avoid a relay damage and to ensure a correct relay
operation, be sure that:
the auxiliary power supply rating corresponds to the auxiliary voltage on site.
the rated values of the relay correspond to the plant data on site
all signal circuits and output relay circuits are connected correctly.
6.1 Power-On
NOTE!
Prior to switch on the auxiliary power supply, be sure that the auxiliary supply voltage corresponds
to the rated data on the type plate.
Switch on the auxiliary power supply to the relay and check that the message "WW" appears on
the display and the self supervision alarm relay (watchdog) is energized (Contact terminals D7 and
E7 closed).
6.2 Testing the output relays
NOTE!
Prior to commencing this test, interrupt the tripping circuit to the circuit breaker if tripping is not de-
sired.
By pressing the push button <TRIP> once, the display shows the first part of the software version
of the relay (e.g. "D08-"). By pressing the push button <TRIP> twice, the display shows the second
part of the software version of the relay (e.g. "4.01"). The software version should be quoted in all
correspondence. Pressing the <TRIP> button once more, the display shows "PSW?". Please enter
the correct password to proceed with the test. The message "TRI?" will follow. Confirm this mes-
sage by pressing the push button <TRIP> again. All output relays should then be activated and the
self supervision alarm relay (watchdog) be deenergized one after another with a time interval of 1
second. Thereafter, reset all output relays back to their normal positions by pressing the push but-
ton <SELECT/RESET>.
6.3 Checking the set values
By repeatedly pressing the push button <SELECT/RESET>, all relay set values may be checked.
Set value modification can be done with the push button <+>< > and <ENTER> (refer to chapter 5).
6.4 Secondary injection test
6.4.1 Test
equipment
Voltmeter and ammeter with class 1 or better
Auxiliary power supply with the voltage corresponding to the rated data on the type plate
Single-phase voltage supply unit
Timer to measure the operating time (Accuracy class 10 ms)
Switching
device
Test leads and tools
Adjustable resistance (0 - 2201 M
/0.6 W)
