TB MRI(K)3-C 03.02 E
53
6.4.5 Test circuit for MRI(K)3 relay with earth-current directional recognition
(ER/XR models)
Figure 6.2: Test circuit
For testing relays
MRI(K)3-ICER/XR
with earth fault di-
rectional feature, current and voltage input signals with
adjustable phase shifting are required. Figure 6.2
shows an example of a single phase test circuit with ad-
justable voltage and current energizing the
MRI(K)3
re-
lay under test.
For testing a relay with earth fault directional feature,
one of the input energizing quantity (voltage) shall be
applied to the relay with a constant value within its ef-
fective range. The other input energizing quantity (cur-
rent) and phase angle shall be appropriately varied.
With the aid of phase angle indicated on the display
the correct function of the relay
MRI(K)3-ICER/XR
can
be checked (ER-relay type).
Parameters I
E>
and I
E>>
should be set to EXIT.
The following measured values are shown:
Measured value
LED
Earth current
E, I
E>
Active share
E, I
P
reactive share
E, I
Q
Earth voltage
E, U
E>
Angel
E, I
E>
, U
E>
