TB MRF3 04.01 E
23
6
Relay testing and commissioning
The following test instructions should help to verify the
protection relay performance before or during commis-
sioning 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 frequency and voltage of the relay corre-
sponds to the plant data on site.
•
the voltage transformer circuits are connected to the
relay correctly.
•
all signal circuits and output relay circuits are con-
nected 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 "ISEG" appears on the display
and the self supervision alarm relay (watchdog) is en-
ergized (Contact terminals D7 and E7 closed).
6.2
Testing the output relays
NOTE!
Prior to commencing this test, interrupt the tripping cir-
cuit to the circuit breaker if tripping is not desired.
By pressing the push button <TRIP> once, the display
shows the first part of the software version of the relay
(e.g. „D01-“). By pressing the push button <TRIP>
twice, the display shows the second part of the soft-
ware version of the relay (e.g. „7.00“. The software
version should be quoted in all correspondence. Press-
ing 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 message by pressing the push button <TRIP>
again. All output relays should then be activated and
the self supervision alarm relay (watchdog) be deener-
gized one after another with a time interval of 1 sec-
ond. Thereafter, reset all output relays back to their
normal positions by pressing the push button
<SELECT/RESET>.
6.3
Checking the set values
By repeatedly pressing the push button <SELECT>, all
relay set values may be checked. Set value modifica-
tion can be done with the push button <+><-> and
<ENTER>.
Summary of Contents for MRF3
Page 1: ...MRF3 Frequency Relay...
