Servotech Power Systems Private Limited

The power factor correction of electrical loads is a common problem to almost all the industrial sector. Most of the loads draw a certain quantity of active power together with reactive power from the mains. The Active power (kW) actually performs the work whereas the reactive power (KVAr) could be interpreted as an undesirable burden on the supply.

The increased flow of reactive power has following disadvantages, Overloading of power Source i.e. Transformer or Alternator. Higher voltage drops throughout the system.


STANDARD FEATURES OF THE Foremost PFC:

• Automation self-adjustment to any capacitor step value.
• Allows manual switching of each capacitor steps.
• Digital indication of power factor preset parameters and specified installation data.
• No- volt release feature to immediately disconnect all capacitor in the even of power failure for more than 35msecs.
• Digital setting of individual parameters including target power factor Switching time, step imit etc.
• Elimination of defective capacitors and their indication.
• Digital reading facility of switching cycles per capacitor steps.
• Digital encoded reading of capacitor sizes.
• Visual display of harmonic overload alarm.
• Visual display of target cos F alarm.
• Stage indication of steps switched in, as well as total banks in operation.
• Easy plug-in back panel terminal connection.
• Protection against capacitor over-current, due to over-voltage, short-circuit, system resonance and presence of higher value of harmonics in the system.
• Digital display of voltages, Currents, kW, kV Ar, KWh, and Frequency.

METHODS OF POWER FACTOR IMPROVEMENT:-
The power factor can be improved by switching ON/OFF the capacitor banks in 3 different manners, viz.

1. Manual Switching - In this method, constant monitoring of the load pattern is required, so as to enable the operator to switch ON/OFF the capacitor banks.
   
   
2. Contactor Logic - In this method, the capacitor banks are switched ON/OFF through elector mechanical contractors. This method is most unsuitable where variable load conditions exists and has several limitations as can be seen from the comparison given below.
   
   
3. Thyristor Switched Capacitor Banks, based on ZERO VOLTAGE Logic - This method is perfectly suitable even in load conditions and has absolutely on limitations whatsoever. Being totally solid state, there is no wear & tear of the system. Detailed write – up and its comparison with contractor – logic is mentioned for your study.

TECHNICAL SPECIFICATIONS

1	Voltage	380-415 Volts, 50Hz
2	Current	5A or 1A Selectable through DIP switch
3	Target P. F. range	0.90Lag…Unity…0.90lead (also indicated on Digital Display)
4	Switching time	Programmable
5	Temperature Range	0 to 50 ° C.

The solar inverter is a critical component of an entire solar energy system. It performs the conversion of the variable DC output of the PV cells into a clean sinusoidal 50- or 60 Hz current suitable for supplying the commercial electrical grid or local electrical network.

DSP Controller - The digital signal controller effectively executes the very precise algorithms required to charge the battery of the system and provide power to the electrical grid without power losses. This is called executing the system at its maximum power point. The drive of the main bridge of the DC/AC is performed by highly flexible PWM peripherals of the controller.


Charge Controllers:

A Solar Charge Controller could be considered the backbone of solar electric systems. A charge controller limits the rate at which electric current is added to or drawn from electric batteries. It prevents overcharging and may prevent against overvoltage, which can reduce battery performance or lifespan, and may pose a safety risk. It may also prevent completely draining ("deep discharging") a battery, or perform controlled discharges, depending on the battery technology, to protect battery life.

 

Simple charge controllers stop charging a battery when they exceed a set high voltage level, and re-enable charging when battery voltage drops back below that level. Pulse width modulation (PWM) and maximum power point tracker (MPPT) technologies are more electronically sophisticated, adjusting charging rates depending on the battery's level, to allow charging closer to its maximum capacity. Charge controllers may also monitor battery temperature to prevent overheating.