T&R 200A-3PH mk2, Руководство по эксплуатации и техническому обслуживанию

Страница: 38 / 48

38
2.4.3 Test procedure
– overcurrent timing
Ensure that the outputs are switched off and that the device under test is isolated before
making any connections.
Disconnect the relay contacts from the DVS3 mk2 and connect to contact set 1 on the 200A-
3PH mk2 (see figure 2.7).
Disconnect the 200A-3PH mk2 phase A from the DVS3 mk2 (this may be left connected if the
test current will not exceed 5A or if using the T&R Link phase lock connection between a
200A-3PH mk2 and DVS3 mk2.).
Figure 2.7 Connections for current injection into directional overcurrent relay
Set the phase angle so that the relay is not in restraint.
Set the 200A-3PH mk2 timer
mode to “OFF”
Press the 200A-
3PH mk2 “ON” pushbutton and increase the desired test current for each
phase.
Switch the output off using the “OFF” pushbutton.
Select “INTERNAL START” timer mode, and switch the output on. The unit now resets, starts
the
timer and begins injecting current into the relay. When the relay’s contacts change state,
the timer will stop and the output will be switched off automatically.
*Connect relay contacts to either
DVS3 mk2 (to determine
restraint angle) or 200A-3PH (to
time overcurrent response)
Rel
a
y
Con
ta
c
ts
*
Rel
a
y
C
u
rre
n
t
Coi
l A
Rel
a
y
C
u
rre
n
t
Coi
l B
Rel
a
y
C
u
rre
n
t
Coi
l C
Rel
a
y
Con
ta
c
ts
*
Rel
a
y
Vo
lta
g
e
c
o
il