ABB REL301 Instruction Manual page 110

To prepare the relay for testing, it is necessary to make certain test connections. Test
connections can be made to the rear terminals of the relay, or through test plugs and
built-in FT switches. The easiest connection, for the voltage and current inputs, is
through the FT test plugs and test switches.
NOTE:
5. 1. NON-PILOT ACCEPTANCE TESTS FOR REL 301/302
5.1.1 Front Panel Man-Machine-Interface (MMI) Test
REL 301/302 front panels consists of 9 Light Emitting Diodes (LEDs), RESET push-
button and the Man-Machine-Interface (MMI) which includes a 2 line (16 character per
line) Liquid Crystal Display (LCD) with 4 push-buttons. All settings, two most recent
targets, display quantities and relay test functions can be accessed with the MMI. For
acceptance testing, the MMI will be referenced for all access to and data acquisition
from the relay. See Figure 1-5 for a detailed layout of the front panel with MMI.
If the system under test is not equipped with the MMI or it is desired to utilize one of
the communication ports, all access to and data acquisition from the relay can be ac-
complished. Data communications via the communication ports will not be covered in
this procedure.
If the relay under test is equipped with reclosing the front panel has additional LED's
(up to 6 with sync check) and the MMI has a switch to toggle between the reclosing
settings and protection settings. Separation of reclosing settings from protection set-
tings alleviates the need to scroll through the reclosing settings when protection set-
tings are in progress.
STEP 1
To begin the test procedure apply rated dc voltage to terminals FT-11(+) and FT-20(-).
The dc voltage rating of the relay is stated on the front nameplate. Upon application of
the appropriate dc voltage, the relay will complete a self-test/startup/initialization
routine. If the startup routine is successfully completed, the "Protection-in-Service
"LED will light. The LCD display enters the METER mode and displays the A phase
current magnitude. (At this time the A phase current will read 0.0 amp and no angle
will be displayed.) If the "Protection-in-Service" LED does not light, check the dc supply
voltage and connections.
Using the RAISE or LOWER push-button to scroll (forward or backward, respectively)
all metering mode quantities can be reviewed. See Table 4-2 for complete details of the
METER display mode quantities.
MMI is accessed by pressing the SELECT push-button, to scroll sequentially through
the five display modes, METER(ing), L-FLT (Last FauLT), P-FLT (Previous FauLT),
TEST, and SET(ing). Current display mode is shown in the upper right corner of the
LCD display. (See Section 4.4.7 for more details.)
Press the SELECT push-button and scroll to the TEST display. The display should
read "STATUS" "0" indicating the self-checking/startup/initialization routine was
(10/94)
When using the conventional FT switch test plugs, it is recommended
to remove the front nameplate to allow the plug to be fully inserted in
the switch jaws.
I.L. 40-386.3
5-3