DCRK DIGITAL POWER FACTOR
CONTROLLERS
M23 GB 21 07 03
96X96mm
•
DCRK5 5 steps
•
DCRK7 7 steps
144X144mm
•
DCRK8 8 steps
•
DCRK12 12 steps
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DCRK DIGITAL POWER FACTOR
CONTROLLERS
OPERATING FEATURES
MEASUREMENTS
•
Present cos j
•
Present L-L voltage + maximum 
•
Present current + maximum 
• D kvar e
 kvar
•
Weekly average P.F.  and present P.F.
•
Capacitor overload % + maximum 
•
Present panel temperature + maximum  .

Measurement logged in non-volatile memory and keypad clearable.
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DCRK DIGITAL POWER FACTOR
CONTROLLERS
OPERATING FEATURES
BUILT-IN PROTECTIONS
•
Capacitor current overload
•
Capacitor over-voltage
•
Panel over-temperature
•
No-voltage release.
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DCRK DIGITAL POWER FACTOR
CONTROLLERS
OPERATING FEATURES
SETUP
•
Base setup with most common settings
(6 parameters)
•
Advanced setup with special settings
(16 parameters)
•
Fast PC setup
•
Fully automatic setup
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DCRK DIGITAL POWER FACTOR
CONTROLLERS
OPERATING FEATURES
ALARMS
•
A01 Under-compensation
•
A02 Over-compensation
•
A03 Low current
•
A04 High current
•
A05 Low voltage
•
A06 High voltage
•
A07 Capacitor overload
•
A08 High temperature
•
A09 No voltage release.
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DCRK DIGITAL POWER FACTOR
CONTROLLERS
ADVANTAGES
•
Extensive number of measurements
(V-A- kvar- ecc.)
•
Capacitor overload protection
•
Measurement of weekly average power factor
•
Built-in temperature sensor
•
TTL/RS-232 serial communication interface
•
Manual or Automatic set-up
•
Programmable alarms
•
Automatic identification of CT current flow
•
Easy CT setting for the final user
•
Measurement of power factor as well as cos j
•
Keypad lock function.
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DCRK DIGITAL POWER FACTOR
CONTROLLERS
CERTIFICATIONS cULus (UL for USA and Canada)
COMPLIANCE
IEC61010-1; IEC/EN 61000-6-2;
CISPR 11/EN 55011
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M23 GB 21 07 03
DCRK DIGITAL POWER FACTOR
CONTROLLERS
COMPARISON
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M23 GB 21 07 03
DCRK DIGITAL POWER FACTOR
CONTROLLERS
COMPARISON
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DCRK DIGITAL POWER FACTOR
CONTROLLERS
COMPARISON
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DCRK DIGITAL POWER FACTOR
CONTROLLERS
TECHNICAL SPECIFICATIONS
M23 GB 21 07 03
TRMS = TRUE ROOT MEAN SQUARE
DCRK measurements are calculated in TRMS, to give exact values also in presence of harmonic distortion.
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DCRK DIGITAL POWER FACTOR
CONTROLLERS
TECHNICAL SPECIFICATIONS
M23 GB 21 07 03
COS j
= DISPLACEMENT POWER FACTOR
It is in the cosine of the displacement angle between voltage and current.
DCRK regulators can read correctly the D.P.F. regardless of the presence of harmonics on current and voltage waveforms.
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DCRK DIGITAL POWER FACTOR
CONTROLLERS
TECHNICAL SPECIFICATIONS
POWER FACTOR
The Power Factor (P.F.) or Total Power Factor (TPF) is the ratio between active power (W) and apparent power (VA).
In a system without harmonics, the power factor is the same value as COS j
.
In other conditions, the power factor is less than the
COS j
.
Power factor correction systems can adjust the COS j to the required value and can thereby obtain the best possible power factor.
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DCRK DIGITAL POWER FACTOR
CONTROLLERS
TECHNICAL SPECIFICATIONS
MEASUREMENT OF WEEKLY
AVERAGE POWER FACTOR
This reading considers the last 7 days of the DCRK operation.
It is calculated in the same way used by energy suppliers, storing active and reactive energy meters in DCRK internal memory.
This value is therefore a true efficiency index of the entire reactive power correction system.
M23 GB 21 07 03
P.F. =
Varh ² + Wh²
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DCRK DIGITAL POWER FACTOR
CONTROLLERS
TECHNICAL SPECIFICATIONS
AUTOMATIC IDENTIFICATION OF CT
CURRENT FLOW
At power up, the DCRK controller automatically recognizes the current flow direction through the
Current Transformer (CT).
This avoids inverting the CT connections during installation.
In cogeneration plants, where it is necessary to operate in 4-quadrant, the CT connection sense must be set manually.
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DCRK DIGITAL POWER FACTOR
CONTROLLERS
TECHNICAL SPECIFICATIONS
EXTREME REDUCTION OF STEP
SWITICHING
A control algorithm provides for the maximum reduction of the number of operations.
The adjustment is conducted in a precise manner and not by consecutive attempts.
The reduction of the number of operations substantially lowers the capacitor and contactor wear.
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DCRK DIGITAL POWER FACTOR
CONTROLLERS
TECHNICAL SPECIFICATIONS
HOMOGENEOUS USE OF EQUAL
RATED STEPS
Each step is provided with one operation counter and one hour meter, in order to provide an equal usage of capacitors with the same rating. The uniform operation of the steps prolongs the life and efficiency of both the capacitors and contactors.
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DCRK DIGITAL POWER FACTOR
CONTROLLERS
TECHNICAL SPECIFICATIONS
AUTOTRIMMING
Consents to the ongoing control of the steps power installed.
In case of step wear, all the relative power parameters are automatically recalculated. This allows the DCRK unit to work rapidly and efficiently, that is with fewer and quicker operations.
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DCRK DIGITAL POWER FACTOR
CONTROLLERS
TECHNICAL SPECIFICATIONS
OVERLOAD PROTECTION OF
CAPACITORS
5% 5th HARM
U THD = 5%
CAP OVRL = 102.5%
The capacitor overload can be caused by overvoltage or, more often, by non-linear loads that cause harmonic distortion on the voltage line.
The voltage waveform is analysed by special algorithm that calculates the exact percentage of the current flowing in the capacitors.
Once the set current overload threshold limit is exceeded, the capacitors are disconnected within a time inversely proportional to the exceeding limit.
THD (Total Harmonic Distortion) does not change with harmonic frequency, and therefore it is not an indicator of capacitor overload.
5% 7th HARM
U THD = 5%
CAP OVRL = 105.5%
5% 11th HARM
U THD = 5%
CAP OVRL = 114.5%
5% 13th HARM
U THD = 5%
CAP OVRL = 120%
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DCRK DIGITAL POWER FACTOR
CONTROLLERS
TECHNICAL SPECIFICATIONS
M23 GB 21 07 03
NO VOLTAGE RELEASE
This function can prevent damage to the capacitors by disconnecting them from the mains when short power lossess are detected.
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DCRK DIGITAL POWER FACTOR
CONTROLLERS
TECHNICAL SPECIFICATIONS
PROTECTION AGAINST
OVER-TEMPERATURE
The DCRK controllers include an internal temperature sensor, which monitors the temperature variation of the electric panel.
This temperature value is displayed and the maximum value is logged.
By setting related parameters, a threshold can be set to switch on a relay to operate a ventilation system.
It is also possible to set an higher threshold to generate an overtemperature alarm.
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DCRK DIGITAL POWER FACTOR
CONTROLLERS
TECHNICAL SPECIFICATIONS
M G
FOUR-QUADRANT OPERATION
When a plant is equipped with a co-generation system, it means there are conditions where energy is imported (consumed) and others where it is exported (generated).
In these circumstances, the displacement angle between voltage and current can vary between 0 ° and
360 ° (four quadrants) so the DCRK must be programmed accordingly.
It is possible to set two independent cos
φ setpoints, one for imported and the other for exported energy.
When working with cogeneration plants, automatic CT connection feature cannot be used.
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DCRK DIGITAL POWER FACTOR
CONTROLLERS
TECHNICAL SPECIFICATIONS
EASY CURRENT TRANSFORMER
SETTING
The manufacturer of power factor correction panels can set all of the setup parameters of the DCRK except the CT primary, since it depends on the final customer plant.
In this case, during the system installation and once the controller is powered up, the display will show a flashing CT indicating that the CT has not been programmed.
Just selecting the correct value from the list and storing it with one key will enable the DCRK operation.
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DCRK DIGITAL POWER FACTOR
CONTROLLERS
TECHNICAL SPECIFICATIONS
AUTOMATIC SETUP
Allows the installation of the DCRK controllers without programming any parameter.
Just pushing two keys, the user is able to put the
DCRK into operation.
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5sec
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DCRK DIGITAL POWER FACTOR
CONTROLLERS
TECHNICAL SPECIFICATIONS
KEYPAD LOCK
The activation of this function is made by a combination of keys.
Once programmed, the following operations will be locked:
•
Access to parameter setup
•
Changing of COS j setpoint
•
Changing the operating mode (AUT/MAN)
•
MAX values clearing
However, all the measurements will be still accessible.
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1 ° MODE
2 ° 3 x
3 ° 2 x
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DCRK DIGITAL POWER FACTOR
CONTROLLERS
TECHNICAL SPECIFICATIONS
TTL / RS-232 INTERFACE
By using the DCRK SW software and the TTL/RS-232 interface, a quick set-up of the controller can be achieved via PC, avoiding in this way, possible parameter setting errors.
The DCRK programmed parameters can also be stored on the PC and quickly downloaded into an unlimited number of units, which require the same programming.
The customising of alarm properties can be made as well as the automatic panel testing with the control of the power installed and the test report printing too.
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DCRK DIGITAL POWER FACTOR
CONTROLLERS
DCRK SW SOFTWARE
TTL / RS-232
COMMUNICATION PORT
•
Full system monitoring:
- Graphic and numeric measurements display
- DCRK status
- Virtual front panel
•
For each step:
- Function
- Status
- Reactive power
- Operation counter
- Hour meter.
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DCRK DIGITAL POWER FACTOR
CONTROLLERS
DCRK SW SOFTWARE
MONITORING THE CAPACITORS EFFICIENCY
•
Measurement of the actual kVar of each capacitor step.
•
Counter for the number of switching operations of each capacitor step.
•
Time counter for the total connection time of each capacitor step.
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DCRK DIGITAL POWER FACTOR
CONTROLLERS
DCRK SW SOFTWARE
TTL / RS-232 COMMUNICATION
PORT
•
Access to all setup parameters in four languages
•
Save / Load / Print parameters
•
Highlighted user changes
•
Back-to-default button.
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DCRK DIGITAL POWER FACTOR
CONTROLLERS
DCRK SW SOFTWARE
TTL / RS-232
COMMUNICATION PORT
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Alarm properties customization
- Alarm enable
- Alarm relay activation
- Step disconnection
- Alarm trip delay.
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DCRK DIGITAL POWER FACTOR
CONTROLLERS
DCRK SW SOFTWARE
TTL / RS-232
COMMUNICATION PORT
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Automatic testing of electric panel.
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DCRK DIGITAL POWER FACTOR
CONTROLLERS
Kvar (400V)
60
50
40
30
20
8
10
12,5
15
20
30
38
45
60
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DCRK DIGITAL POWER FACTOR
CONTROLLERS
KITS TO ASSEMBLE BF..K CONTACTORS
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DCRK DIGITAL POWER FACTOR
CONTROLLERS
Switch disconnectors
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Digital multimeters
Push buttons and selectors
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