KMB systems-power quality meters and power factor controllers for industrial application

NOVAR 206/214

6/14 outputs, measuring voltage separate

NOVAR 214

Production stopped.
See NOVAR 1206/1214 for replacement.

Power factor controllers NOVAR 206 and NOVAR 214 are fully automatic instruments enabling optimal control over compensation of reactive power. These devices are designated for middle- to very-demanding applications with non-standard voltage being measured.

Characteristics

For demanding applications
6 or 14 relay outputs + alarm relay
Supply voltage 230 V AC (or 115 V AC), 50/60 Hz
Separate measuring voltage 100 ~ 690 V AC, 50/60 Hz
Measuring current sensitivity 0,01 A
2nd tariff input
High resistance against electromagnetic interference
Front panel 144 x 144 mm with high efficient LED-display
Optional communication interface

General Description

The Novar 206, 214 reactive power governor is a fully automatic instrument that allows optimum control of reactive power compensation.

It contains precise voltage and current measurement circuits, and precise evaluation of both root-mean-square (RMS) current and the power factor is achieved through digital processing of the values measured.

The voltage measuring circuit is isolated and can measure voltages from 100 to 690 V AC. 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. The measuring inputs can be connected to the governor in any combination, that is any phase or line voltage and any phase current.

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 / undercompensation). 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 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 measurement 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 internal memory for subsequent analysis.

Fully automatic installation is an 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, overcurrent, measuring voltage drop-out, harmonic distortion preset threshold exceeded, overcompensation or undercompensation, section limit connection rate exceeded, section drop-out or reverse supply condition.

The governors are supplied in two basic versions with different numbers of outputs: Novar 206 with six output relays and Novar 214 with fourteen output relays. Both models have an input for the second metering rate.

The governors 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 governor parameters can be set using a remote computer.

Besides the power factor capacitors, it is possible to connect up to ten compensatory chokes (mains de-compensation). Any output can be set as fixed.

Characteristics and Features

Measurement principles

high current and power factor measurement accuracy is achieved by utilizing digital signal processing using a microprocessor and FFT algorithm
precise measurement and control functions even under conditions of voltage or current waveform distortion by higher harmonic components
evaluation of current total harmonic distortion (THD) level by up to the nineteenth harmonic component and display of the instantaneous THD value including the levels of the 3^rd, 5^th, 7^th, 11^th, 13^th, and 17^th harmonic components.

Control principles

governor speed of response independently programmable for conditions of undercompensation and overcompensation, respectively
the preset speed of response increases in proportion to instantaneous control deviation, that is by square of the ratio of the control deviation to the smallest capacitor section value (C/k); growing control deviation may reduce this value to minimum control time of 5 seconds.
if the control deviation is smaller than the smallest capacitor section current (C/k), the preset control response time gets longer twofold; if the control deviation keeps decreasing under a half of the smallest capacitor section current (C/k), no control takes place

Dual metering rate operation

the principal control parameters can be changed in control process by an external signal (relay contact)
power factor desired values and control time adjustable for high and low metering rates

Automatic connection detection

only necessary to set the measuring voltage connection phase (U=FA) or line (U=SD)
automatic connection detection on governor installation as shown in the following table

Tab. 1 : Measuring (and supply) voltage connection in respect to current signal connected
phase measuring voltage (U=FA)	line measuring voltage (U=SD)
No.	Mode of connection	No.	Mode of connection
1	L1-0	7	L1-L2
2	L2-0	8	L2-L3
3	L3-0	9	L3-L1
4	0-L1	10	L2-L1
5	0-L2	11	L3-L2
6	0-L3	12	L1-L3

Automatic control section recognition

with appropriate setting, when switching it on, the governor automatically recognizes the sections´ currents
It is possible to connect any combination of the control sections
section value manual entry using the C/k value and the switching program as described in the table below or direct entering of the value of each section

Tab. 2: Switching program
No.	combination	displayed	No.	combination	displayed
1	1:1:1:1:1	1111	7	1:2:2:2:2	1222
2	1:1:2:2:2	1122	8	1:2:3:3:3	1233
3	1:1:2:2:4	11224	9	1:2:3:4:4	1234
4	1:1:2:3:3	1123	10	1:2:3:6:6	1236
5	1:1:2:4:4	1124	11	1:2:4:4:4	1244
6	1:1:2:4:8	11248	12	1:2:4:8:8	1248

Specifying section value

continuous specification of section value recognized in the control process

Disabling faulty sections

continuous checking of control sections in the control process and in case of repeated failure detection, temporary disablement of the faulty section and possibly concurrent alarm actuation
periodic recheck of the temporarily disabled sections in five days and on positive test results (for example when replacing a burnt fuse link) enabling them again

Fixed sections

any control section can be set as fixed, that is as constantly connected or constantly disconnected

Alarm with free program

independently adjustable alarm´s signaling and action functions in accordance with the tables below
a LED is provided for signaling on the front panel and a contactless "Alarm" switch

Tab. 3 : Alarm - signaling
No.	condition	description	min. time
1	undercurrent	current measuring transformer secondary winding current below 0.01 A	5 seconds
2	overcurrent	current measuring transformer secondary winding current over preset nominal value (5A/1A)	5 seconds
3	compensation error	power factor beyond range 0.9 L ÷ 1.00	15 minutes
4	voltage lost	voltage measurement not detected	5 second
5	harmonic distortion	THD preset threshold level exceeded functional with loads 10% plus	5 minutes
6	number of connections exceeded	the number of connections of a section exceeded preset limit	immediately
8	reverse supply	power flow from appliance to source detected	5 minutes
9	section failure	constant section value deviation detected in control process (most often section dropout)	5 connections + 5 disconnections

Note: The conditions printed in bold are preset as standard.

Tab. 4 : Alarm - action
No.	condition	description	min. action time	action
1	undercurrent	current measuring transformer secondary winding current below 0.01 A	10 seconds	disconnection of all outputs except the fixed ones
4	voltage lost	voltage measurement not detected	5 seconds	disconnection of all outputs except the fixed one
5	harmonic distortion	THD preset threshold level exceeded functional with loads 10% plus	5 minutes	disconnection of all outputs
8	reverse supply	power flow from appliance to source detected	5 minutes	disconnection of all outputs except the fixed ones
9	section failure	constant section value deviation detected in control process (section dropout)	5 connections + 5 disconnections	section disabled

Note: The conditions printed in bold are preset as standard.

Communication scheme example

Communication Options

All types of power factor controller include an option al, galvanically isolated communication line - either RS232 or RS485. It enables remote monitoring of all the measured values, state and also perform configuration of the device. For communication with the device there are two similar protocols available - MODBUS and KMB. Both protocols are documented and publicly available.

Software for data acquisition and processing is also available. The basic version of the RETIS software is free of charge and can be downloaded from our web site.

interface	RS232/RS485, galvanically isolated
speed	4800 to 19200 Bd
maximum devices on a comm line	1 / 32
max distance of two nodes	30 m / 1200 m
Communication protocol	KMB, Modbus RTU

Accessories for for Reactive Power Compensation

With our power factor controllers we also supply all other necessary components - compensation capacitors, chokes, contactors, current transformers and other. For mor information and quotes please contact us.

LV and HV capacitors form ZEZ Silko

Affordable compensation and de-compensation chokes by ELEKTRA

PEWATRON's current transformers with both compact and split cores (X/5 and X/1)

Benedict&Jager contactors

IP 65 COVER

transparent plastic cover to improve front panel protection (IP-65)
availavle for booth 96x96 and 144x144 mm

Tecnical Parameters

*Adjustable parameters*
power factor desired	0.80 ind. through 0.90 cap.
connection time (ma. value, depends on control deviation)	5 to 1 200 seconds
reconnection lockout time	5 to 1 200 seconds
smallest capacitor current (C/k value converted to CMT primary side)	(0.01 ÷ 2 A) x CMT ratio
choke control limit power factor	0.80 ind. through 0.90 cap.
setting compensation section values	automatic or manual
setting connection mode	automatic or manual
*InputsOutputs*
measuring voltage (galvanically isolated)	100÷ 690 V AC+10/-20%, 50/60 Hz
voltage input impedance	> 200 kΩ
measuring current (galvanically isolated)	0,01 to 7,5A
current input serial impedance	< 10 mΩ
current measurement accuracy (RMS value and 1^st harmonic)	± 1% ± 0,01A
harmonic component and THD measurement accuracy	± 10%
number of output relays	6 or 14
output relay load rating	250 V AC / 4 A
"alarm" relay load rating	250 V AC / 4 A
power supply	230 V AC +10/-20%, max. 10 VA
installation overvoltage class	II in compliance with EN 61010-1
*Telecommunication*
interface	RS232/RS485, galvanically isolated
transmission rate	9 600 Baud
maximum number of instrument on one communication line	1/32
maximum nodetonode distance	30 m / 1,200 m
*Operating conditions*
working environment	class C1 in compliance with IEC 6541
operating temperature	-40° ÷ +60° C
relative humidity	5 ÷ 100 %
*EMC*

noise suppression level	in compliance with EN 50081-2 EN 55011 , class A EN 55022 , class A
immunity	EN 61000-6-2

*Mechanical*
enclosure: - front panel - back panel	IP40 (or IP54) IP 20
dimensions: - front panel - built-in depth	230 x 105 x 320 mm 144 x 144 mm 80 mm
Mass	max. 1,0 kg

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