Reliability and the ability to properly operate in all conditions have become the main requirements for power factor regulators but they must also be able to detect any critical condition in order to protect power factor equipment.
The voltage and current measuring inputs have digital band-pass filters, which warrant consistent operation, even with systems characterised by high harmonic distortion. 
A special algorithm is able to calculate capacitor overload current and provide the required protection by disconnecting it. 
Another algorithm is able to calculate the exact amount of reactive power required to correct power factor and thereby connect or disconnect the single capacitor. 

The result is a substantial reduction of the number of operations and a homogenous wear of steps having equal rating.It is possible to monitor the panel temperature by means of the built-in sensor or by external probe and control a cooling fan or disconnect the capacitors in over-temperature conditions. 
By using one of the latest generation of 16-bit microprocessors in the DCRJ12F controller, the following functions have been implemented:
- Protection against harmonic overload of the capacitors on all three phases
- Logging of events related to capacitor harmonic overloads
- Analysing the line voltage and current harmonics
- Analysing the waveform harmonics of line voltages and currents previously logged during harmonic overload events.
A set-up and supervision software is available.
 

General characteristics

• 11 static output plus 1 alarm relay output
• Digital microprocessor regulator for automatic power factor correction systems for the connection and disconnection of capacitor banks
• For  system of medium-voltage (separate voltage input) and co-generation systems (4 quadrant operation)
• Accurate and reliable power factor control of a system even in presence of high current and voltage harmonic content
• Warrants optimal capacitor use for increased life using rational control of the capacitor operation and connection time
• RMS voltage and current measurements
• Measurement of average weekly power factor (last 7 days), capacitor overload, electric panel temperature, 
• Event viewing of harmonic overload limit exceeded only
• Harmonic content analysis of logged events complete with relative waveforms
• Adjustable tripping sensitivity, integral switching time
• Micro-breaking protection, no-voltage release
• Protection against capacitor overload and panel overheating
• Measurement of temperature
• Connection to external NTC01 sensor
• RS232/RS485 serial ports
• Remote supervision software for personal computer interface and supervision for fast set-up, function and alarm customising and automatic electric panel testing
• Installation ease with the use of one external current transformer only
• Configuration of mixed static and electromechanical steps.