28
TB MRI3-ITE(R) 12.00 E
6
Relay testing and commis-
sioning
The test instructions following below 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 current of the relay corresponds to the
plant data on site.
•
The current transformers 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 with 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 and LEDs
NOTE!
Prior to commencing this test, interrupt the trip circuit to
the circuit breaker if tripping is not desired.
By pressing the pushbutton <TRIP> once, the display
shows the first part of the software version of the relay
(e.g. „D21-“). By pressing the pushbutton <TRIP>
twice, the display shows the second part of the soft-
ware version of the relay (e.g. „1.00“). 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 pushbutton <TRIP> again.
All output relays and LEDs should then be activated
and the self supervision alarm relay (watchdog) be
deactivated one after another with a time interval of
3 seconds. Thereafter, reset all output relays back to
their normal positions by pressing the pushbutton
<SELECT/RESET> (about 3 s).
6.3
Checking the set values
By repeatedly pressing the pushbutton <SELECT>, all
relay set values may be checked. Set value modifica-
tion can be done with the pushbutton <+><-> and
<ENTER>. For detailed information about that, please
refer to chapter 5.
For a correct relay operation, be sure that the fre-
quency set value (f=50/60) has been selected ac-
cording to your system frequency (50 or 60 Hz).
6.4
Secondary injection test
6.4.1
Test equipment
•
Ammeter with class 1 or better,
•
auxiliary power supply with the voltage correspond-
ing to the rated data on the type plate,
•
single-phase current supply unit (adjustable from
0 to
≥
4 x I
N
),
•
timer to measure the operating time
(Accuracy class
≤
±
10 ms),
•
switching device and
•
test leads and tools
