GRUP ARGE SMART GES1, Instruction Manual

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Smart SVC Relay Instruction Manual
25
Figure 3.33
With the message in Figure 3.34, the device starts current transformer test by activating the
first three stages.
Figure 3.34
If the connections are correct, the information about completion of the first test is given to the
user after the message in
Figure 3.35.
Figure 3.35
NOTE : “+”and “-” values on the right side of L1, L2, L3 states current transformer connection
directions. In the example, “-”displaying next to “L2” indicated the current transformer
direction that is attached to the relevant phase is reversed. SMART SVC RELAY realizes this
situation and fix the reverse connection automatically.
NOTE : If the current drawn by activated stages is insufficient, Smart relay increases the
number of activated stages and continues the test.
NOTE : In order for SMART SVC RELAY to complete current transformer test in a short time,
it is advised to place three-phase capacitors to the first stages from large to small. Connecting
two-phase, single-phase capacitors and constant shunt reactors to the next stages enables
transformer test to be completed in a short time. It is not compulsory to carry out this advice.
Even though stage connections are not done like above, Smart relay will complete the test and
start to operate correctly. In addition to this, it is recommended that the current transformer
used in the system have a class of 0.5 for measurement accuracy.
After the first completed transformer test, the following message ( Figure 3.36 ) will display on
the screen and the current transformer test repeats for control.
Figure 3.36
After the repeated current transformer test, the message in Figure 3.37 informs the user about
current transformer directions and the process completed by receiving the message in Figure
3.38 .
Transformer Control
1
Load must be constant
L1 - L2 - L3 -
L1 + L2 - L3 +
Transformer Control 2
Load must be constant
L1 + L2 - L3 +
L1 + L2 - L3 +
Transformer Control
Process completed