NOVAR 1106/1114
General description
The Novar 1106, 1114 reactive power controller is a fully automatic instrument that allows optimum control of reactive power compensation.
It contains precise voltage and current measurement circuits, and high precision evaluation of both root–mean–square (RMS) current and the power factor is achieved through digital processing of the values measured.
The 230 V AC supply terminals also work as the measurement voltage input. The current measurement input is a general–purpose one for the nominal secondary winding current value of a current measuring transformer (CMT) 1A or 5A. Current of any of the phases can be measured.
The instrument calculates the fundamental harmonic component of the active and reactive currents using the FFT algorithm. Thus precise measurement and control are provided even if the current waveform is distorted by higher harmonic components.
Controlling takes place in all four quadrants and its speed depends on both control deviation value and its polarization (overcompensation /
under compensation). Connecting and disconnecting power factor capacitors is carried out to achieve the optimum compensation condition with a single control step and minimum number of switching on or off the sections. At the same time, the instrument chooses the sections with regard to their even load and preferably connects those that have been disconnected for the longest time and the remanent charge of which is thus minimum.
While controlling, the instrument continually checks the compensation sections. If a section’s drop–out or value alteration is detected, the section is temporarily disabled at relevant setting. The section temporarily disabled is periodically tested, while control is in progress, and possibly enabled again.
In measurement of current, harmonic component levels are evaluated of up to the nineteenth order. The total harmonic distortion, THD, which can be viewed on a display, is calculated from these measurements’ results. It is possible to preset the THD threshold level at which the governor disconnects all compensation sections thus preventing their damage. Besides that, the most adverse THD values, values of harmonic components selected and the minimum power factor values are recorded into the instrument’s memory for subsequent analysis.
Fully automatic installation is advantage of the instrument. The governor automatically detects both the mode of the current measured connection and the value of each compensation section connected. Entering these parameters manually is also possible.
The “Alarm" relay output can be set to indicate non–standard conditions, such as undercurrent,
over current, harmonic distortion preset threshold exceeded, overcompensation or
under compensation, section limit connection rate exceeded, section drop–out or reverse supply condition.
The controllers are supplied in two basic versions with different numbers of outputs: Novar 106 with six output relays and Novar 114 with fourteen output relays.
The controllers can be ordered in a version with galvanically isolated RS 223 or RS 485 standard communication interface. All values measured can be monitored and the controller’s parameters set using a remote computer.
Besides the power factor capacitors, it is possible to connect up to three compensatory chokes (mains decompensation). Any output can be set as fixed.
Technical data
Adjustable parameters
power factor desired
connection time (ma. value, depends on control deviation)
reconnection lockout time
smallest capacitor current
choke control limit power factor
setting compensation section values
setting connection mode
Inputs-Outputs
measuring voltage (galvanically isolated)
voltage input impedance
measuring current (galvanically isolated)
current input serial impedance
current measurement accuracy (RMS value and 1st harmonic)
harmonic component and THD measurement accuracy
number of output relays
output relay load rating
power supply
installation overvoltage class
Telecommunication
interface
transmission rate
maximum number of instrument on one communication line
maximum node-to-node distance
Operating conditions
working environment
operating temperature
relative humidity
EMC
noise suppression level
immunity
Mechanical
enclosure
- front panel
- back panel
dimensions
- front panel
- built-in depth
mass |
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0,80 ind. through 0,90 cap.
5 to 1 200 seconds
5 to 1 200 seconds
(0,01 ÷ 2 A) x MTP ratio
0,80 ind. through 0,90 cap.
automatic or manual
automatic or manual
shared with supply voltage
> 200 kOhm
0,01 to 7,5A
< 10 mOhm
+/-1% +/-0,01A
+/-10%
6 or 14
250 V AC / 4 A
230 or 115 V AC +10/-20%, 50/60 Hz, max. 10 VA
II in compliance with EN 61010-1
RS 232 / RS 485, isolated
9600 Baud
1/32
30 m / 1200 m
in compl. with IEC 654-1, class C1
40° ÷ +60°C
5 to 100 %
in compliance with EN 50081-2,
EN 55011 , class A,
EN 55022 , class A
in compliance with EN 61000-6-2
IP40 (or IP54)
IP20
230 x 105 x 320 mm
144 x 144 mm
80 mm
max. 1,0 kg |
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