KMB NOVAR 2600, Руководство по эксплуатации, Страница: 40 / 96

NOVAR 2600 Operating Manual
If at least the alarm indication is set, the controller continually checks reactive power changes in the
power system during the control process as the sections are connected and disconnected and
compares them with each section’s power preset in its memory. All of the single -phase reactive power
components are checked individually.
If connecting and disconnecting a section does not repeatedly result in adequate change to reactive
power in the power system (or a change to reactive power measured is very different from the section
power value), the controller tags such a section as faulty and, if the alarm actuation has been set too,
it will disable the section and stop using it in further compensation temporarily. Such section is tagged
with its icon crossed ( ,for example).
If the alarm actuation is not set, the controller will only tag the faulty section, trigger alarm indication,
but will keep using the section in compensation process.
Following parameters can be set :
• Limit – rdg … maximum allowed single-phase power difference component in percent of
the power value (“reading”); default value is 20%.
• Delay … minimum number of consecutive following out-of-tolerance measurement
events of the same tolerance polarity to force the alarm active (number of switchings on/
off)
For example, for the alarm setting above, if the three-phase output power is 10 kvars (i.e.
corresponding single phase power is 3.33 kvars) the single-phase rdg-component is
10000 / 3 x 0.2 = 667 vars
Real deviation tolerance is slightly bigger: approx. 700 vars. That means if the controller detects the
output phase power size approximately lower than 3333-700=2633 vars or higher than
3333+700=4033 vars it classifies the output power out of tolerance.
If preset number of consecutive out-of-tolerance detections of particular section with the same
tolerance polarity occurs, i. e. the output response was continuously lower (or higher) for preset times,
the alarm gets active; the output is tagged and - depending on the alarm setting - it is disabled too.
The section that has been temporarily disabled is periodically, about every four days, checked by
including it in compensation for one switching operation. If the controller detects a relevant response
in the power system (within adequate allowance) to connecting the section, it will include the section
back in the control process again. In this way, for example, a repaired section is automatically
included in compensation (after replacing section fuse, for instance).
If the controller does not put a disabled section back to compensation automatically, such reinclusion
in the control process will take place in the following situations:
• power supply interruption or controller initialization
• editing the section’s type or the section's value
•
new automatic output power recognition (AOR) process
4.3.3.5 T1>< (T2><) - “Temperature Exceeded/Drop” Alarm
These two fully independent alarms use temperature as their control quantity. You can use
• either Ti ... internal temperature . This temperature is measured with the sensor which is
built inside the instrument.
• or Te ... external temperature . This temperature is measured with an external Pt100-type
temperature sensor. Such sensor is available as optional accessory a can be connected to
appropriate instrument models only ( that are equipped with the sensor connector ).
40