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NOVAR 2600 Operating Manual

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output No. 1.6 was recognized as non-standard capacitor, out-of-tolerance or possibly
damaged (its phase components doesn't match any standard capacitor type); it can be
caused by wrong particular measurement too and the type can be reclassified later in the
process

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output No. 2.8 is alarm output; output No. 2.9 is fan output; both of them are switched off now

Note : The recognized output powers are not displayed as actual power values but

the

nominal power

values, that is the values that correspond to the preset nominal voltage

NOM

of the network.. It is supposed that the metering current transformer ratio and the metering
voltage transformer ratio, if any, are set correctly.

If the controller does not succeed in determining a output’s value, it does not show it – dashes are
displayed instead. This condition occurs if reactive power value in the power system fluctuates
considerably due to changes in load.
After carrying out three rounds, partial evaluation is carried out. If measurements in the rounds carried
out provides sufficiently stable results, the AOR process is completed. Otherwise the controller carries
out up to three more rounds.
A requirement for successful AOR process is sufficiently stable condition of the power system – while
connecting or disconnecting a section, the reactive load power must not change by a value which is
comparable with, or even greater than, the reactive power value of the section under test. Otherwise
the measurement result is unsuccessful. As a rule of thumb, the section values are recognized the
more precisely, the lower the load is in the power system.
Ongoing AOR process can be interrupted at any point either manually by pushing the

button

or by any of alarm actuations. In such case, the recognized data are neglected and output setting is
not updated.
On completion of the total process, the controller saves recognized output types and sizes into its
memory. Then it returns into the state from which it was initiated. If it is the control state and at least
one section with non-zero total reactive power has been detected, the controller starts power factor
control.
Otherwise, if the previous AOR process unsuccessful (no valid outputs found or cancelled
prematurely), the process is automatically relaunched each approximately 15 minutes again in the
control mode.

It is strongly recommended to check recognized section values after the AOR process has
passed. If any doubt about the recognized values you can start the AOR process again or, if
necessary, to edit the section values manually. It is often necessary at the lowest power
sections especially when the AOR process run while high load at the network – such sections
can be recognized as zero outputs and needs to be set manually.

Sometimes it is necessary to start the AOR process at disconnected load (or at zero load )–
for example ,when testing a compensation switchboard before its expedition to a customer. If
the default controller undercurrent (

) alarm actuation is set the controller gets into the

standby state in such case and the AOR process cannot be started. Therefore, it is
necessary to switch this alarm actuation temporarily off ( and to return it back after the AOR-
process passes).

4.4.4 CT Connection Test

For proper instrument operation, right current inputs' connection is crucial requirement. The inputs'
phase order must correspond to connected voltage signals and, furthermore, their polarity must
respect orientation of used current transformers (k/l terminals).