There is always a possibility of highly fluctuating loading patterns in industries and electrical systems which use resistance welding, cranes, wind turbines, press breaks, induction furnace,elevators,electric trains, etc. Since the electro-mechanical switch contactors do not suit for extensive switching cycle due to wear & tear, these dynamic power factor controllers(DPFC) which use electronic switching are the most appropriate options.
Parameters Measured and Displayed in the DPFC are
- Voltage – Power Factor
- Current – Frequency
- Reactive Power – Harmonics
System Design
Baron Dynamic Power Factor Correction System is unique with its custom based design based on the load study conducted on site with high-speed power quality analyzer with recording interval selected as appropriate to the study, depending on the loading pattern.
The System is basically designed as a series RLC circuit to suppress the transient inrush current.
Thyristor Switching provides high-speed switching of capacitor stages. The zero crossing switching capability of thyristor switching module avoids the problem of voltage peaks during energizing of capacitors at high-speed. The Selection of capacitor stages with appropriate stage ratios matching the load profile provides power factor correction with high-resolution.
The protection against spike current, Capacitor over load, and over Temperature is offered by forced Thyristor turn-off. It does not use semiconductor fuses as in the case of SSR, which causes fuse blowing.
Salient Features
Microprocessor based Power Factor Controller with Special Features
- Four Quadrant Measurement
- Accuracy of +0.8% for Reactive Power, + 0.5% for Current 12 steps to operate capacitor circuits.
- Precise and quick relay controls.
- Continuous monitoring of defective capacitor stages.
- Independent setting of capacitor switching time to match discharge time of each capacitor.
- Counting, Storing and Display of number of switching operation.
- Alarm for excess operation than programmed limits.
- Dual control curve characteristics: to avoid over compensation under light loads and to avoid inductive reactive power under regenerative conditions.
- Monitoring of harmonic levels continuously with alarm and safety trip facility.
- Zero voltage & Zero current tripping with alarm signals.
- Manual/Automatic operation with ability to switch each individual capacitor
System Protection by Incoming Moulded Case Circuit Breaker selected with tripping characteristics for the individual capacitor circuit as well as multi bank parallel switching characteristics.
Feeder Protection by MCB having tuned tripping characteristics to ensure avoidance of any inadvertent tripping by the inrush current of the capacitors.
Thyristor Switching Module to compensate loads over short period of time
Insertion speed: 60ms – Protection circuit with signaling LED
Electronic components: SCR – High temperature protection
Main input: 170V to 500 V A.C, L – L, 50 Hz. – Fan dedicated to the radiator cooling
Heavy Duty Capacitors with Unique Features
| Construction | Cylindrical Dry Type with Flame Inhibiting Mineral Filler Metallised Polypropylene Construction |
| Over Current Withstand Capability | Min. 1.5 times IN at rated Voltage permanently |
| Over Current Min. 200 times IN during short peak currents | |
| Wattage Loss | 0.2 Watt/KVAR at Capacitor Coils and 0.5 Watts/KVAR at terminals including Discharge Resistors |
| Temperature Withstand Capability | -25°C to + 55°C |
| Voltage | 440 V |
| Voltage Harmonics Withstand Capability | 5th Harmonics – 5.0% 7th Harmonics – 4.0% 11th Harmonics – 3.0% 13th Harmonics – 2.1% |
| Safety Features | Patented Spring loaded Terminals, Overpressure Disconnector |
Alarms
The Alarm Signal is initiated for abnormalities in the System. By simply pressing of Manual / Reset Push button, the alarm can be Accepted & Re-set.
Alarms indicated:
- Power factor Alarm – “U=0” Alarm
- Harmonic Alarm – “C=0” Alarm
- Over-current Alarm – “I=0” Alarm