KMB NOVAR 2600, Operating Manual

Page: 47 / 96

NOVAR 2600 Operating Manual
The CT connection test is simple tool for right current transformers' connection analysis. It uses the
first four compensation outputs for detection of individual phase current angles. The only condition
must be fulfilled for the CT test usage : either
three-phase or single-phase compensation capacitors
are connected to the first four control outputs . If, for example, two-phase capacitors or any chokes
connected to the outputs, the CT test gets fail results !
If inappropriate compensation elements connected to the first four outputs,you can set such
outputs temporary to
the fixed-off control state; then the instrument will use tor the CT test
the next four outputs that are set as the control outputs.
The CT test can be launched manually only. Navigate to the last option of the Control group of the
PFC setting and select the CT Test . After the command being confirmed, the information screen
appears :
Fig. 4.16 : CT Test Info Message
During following 10 seconds, you can either cancel the start command with the  button or to skip the
message timeout with the  button to start the CT test immediately. Or you can simply let the timeout
to expire and then the CT test starts.
The CT test window shows information about individual phase current inputs' connection. At the
beginning of the test, following message is shown :
L1 L2 L3
CT : - - - - - - - - -
The dashes mean that the test result is not yet ready now.
First of all, the first four of control outputs are disconnected, step by step. Then the instrument waits
until discharge time of the outputs just disconnected expires - such undischarged outputs can be
identified with decreasing shadow filling. During this,
Output 1.1 (for example ) message flashes in the
headline, that means that the instrument waits till output No. 1.1 is ready to use.
Fig. 4.17 : CT Test Window
When the outputs used for the testing are discharged, the instrument starts to switch the outputs step
by step. After each of the step is switched off, the result of reactive and active powers and evaluated
current signal angle of individual phases appears at the bottom of the CT test window. If the
measurement is not successful, dashes appear instead the test results ( this is not unusual that such
results appear, especially if high power load in the network or if the powers of outputs that are used of
testing are low, compared to the network load ).
47
CT Connection Test
(1-p or 3-p capacitors supposed
at the first 4 control outputs)
will be started in
10 secs