In running some applications like Cane Fibrizor, Cane Cutter, Cane Chopper, Crushers , Mixers etc. experiences frequent kick loads / variable load due to uneven raw material feeding. This leads to overloading of the motor due to insufficient motor torque & causes nuisance tripping due to over current, which affects the process & results production loss.

 

To avoid this, 15% fixed conventional buffer resistance is kept in the Motor Rotor circuit to deliver the high torque & to limit current kicks. This is useful when the motor is loading more than 100% for short time. When there is rated load or load less than the actual rating of motor then there is no need of 15% conventional Buffer Resistance in the Motor Rotor circuit. This resistance will create continuous power loss in the form of heat loss.

 

Slip Regulator / Dynamic Buffer(DB) offers variable Resistance in the Rotor circuit due to slip dependent Resistance technology. When there is kick load / over load, then Slip Regulator offers Resistance instantaneously depending on slip at that load to its maximum value (upto 12 - 15%) & when the load is less than 100% of rated capacity or equal to rated capacity, then Slip Regulator offers 3 to 4% Resistance.

 

This reduced value of Resistance during under load will help to save the power as compared to conventional Buffer Resistance. In Rotor Resistance Starter / Controller the part of resistance is kept in the Motor Rotor circuit continuously as a Slip Regulator / dynamic buffer to provide the required running torque to the applications which are experiencing the variable loads (like Crusher, Fibrizor in sugar Industries.) Depending on overloading pattern the speed tends to reduce which increases the slip frequency results to increase in resistance. As load goes down the slip frequency reduces results to reduce the resistance.

 

Salient Features:

• Slip dependent Resistance provides automatic resistance variation during acceleration & running.
• Low Starting current.
• High starting torque.
• Built in Slip regulator contactor.
• No moving parts & stepless cutting of Resistance.
• No maintenance

 

Applications:

Sugar industry - Fibrisors, Cutters, Levellers & applications which requires high starting & running torque.

Generally AC system have three basic loads, i.e. resistive, inductive and capacitive. In case of purely resistive load, the current and voltage are in phase. Whereas, in case of inductive load, current lags behind the voltage. In industries, most of the equipment and appliances are inductive in nature. In case of capacitive load current leads the voltage.

 

Mostly capacitors are installed for power factor correction of system . Inductive or capacitive loads are termed as the reactive loads. In this loads active power can only be consumed in resistive portion of load, where the current and voltage are in phase. Reactive component of the load consumes reactive power which is necessary for energizing the magnetic circuit of the equipment and is not useful for work.

 

Inductive loads are with two current components, one is active current & another is reactive current. Vector sum of these two power components (active and reactive) is termed as Apparent Power (measured in kVA). The ratio of active power (kW) to apparent power (kVA) is known as power factor.

 

In case of resistive load kVAr (reactive component) is absent, so angle φ will be zero degree, hence power factor will be unity. For a inductive load the power factor will be lagging and for capacitive load the power factor will be leading.

 

Thus it is clear that, if the power factor is different than unity (low power factor), more will be the kVA demand for same kW load. Most of the HT tariffs include kVA Demand charges along with Energy Charges, more the kVA demand for the same kW load more will be the electricity bill to consumer.

 

Disadvantages of Poor Power Factor:

Load draws high current for same value of useful power

1. Which results in increase in size of the switchgear, cable, transformer etc. All this adds to the cost.

2. High current causes increased power loss (I2R loss) in the circuits. The conductor temperature increases and hence the life of                      insulation gets reduced.

3. It increases voltage drop which affects different loads as below:

• Reduces the illumination of lighting lamps.
• Heating devices operates at reduced temperature, results in increased consumption & process time.
• It leads to nuisance tripping of Induction motor on overload.

 

Advantages of Improved Power Factor:

• Reduces losses in the system, cables, lines, and feeder circuits and hence lower sizes could be selected.
• Improves system voltage & helps to all types of load to operate at rated capacity with designed output.
• System capacity Increases (kVA) for the same kW, permits additional loading.

 

Range: APFC panels with & without series reactor for any capacity LT & HT system.

We are offering ht capacitor. Available up to 10mvar capacity with de tuned harmonic filters. Indoor and out door mounted.

In running some applications like Cane Fibrizor, Cane Cutter, Cane Chopper, Crushers , Mixers etc. experiences frequent kick loads / variable load due to uneven raw material feeding. This leads to overloading of the motor due to insufficient motor torque & causes nuisance tripping due to over current, which affects the process & results production loss.

 

To avoid this, 15% fixed conventional buffer resistance is kept in the Motor Rotor circuit to deliver the high torque & to limit current kicks. This is useful when the motor is loading more than 100% for short time. When there is rated load or load less than the actual rating of motor then there is no need of 15% conventional Buffer Resistance in the Motor Rotor circuit. This resistance will create continuous power loss in the form of heat loss.

 

Slip Regulator / Dynamic Buffer(DB) offers variable Resistance in the Rotor circuit due to slip dependent Resistance technology. When there is kick load / over load, then Slip Regulator offers Resistance instantaneously depending on slip at that load to its maximum value (upto 12 - 15%) & when the load is less than 100% of rated capacity or equal to rated capacity, then Slip Regulator offers 3 to 4% Resistance.

 

This reduced value of Resistance during under load will help to save the power as compared to conventional Buffer Resistance. In Rotor Resistance Starter / Controller the part of resistance is kept in the Motor Rotor circuit continuously as a Slip Regulator / dynamic buffer to provide the required running torque to the applications which are experiencing the variable loads (like Crusher, Fibrizor in sugar Industries.) Depending on overloading pattern the speed tends to reduce which increases the slip frequency results to increase in resistance. As load goes down the slip frequency reduces results to reduce the resistance.

 

Salient Features:

• Slip dependent Resistance provides automatic resistance variation during acceleration & running.
• Low Starting current.
• High starting torque.
• Built in Slip regulator contactor.
• No moving parts & stepless cutting of Resistance.
• No maintenance

 

Applications:

Sugar industry - Fibrisors, Cutters, Levellers & applications which requires high starting & running torque.

Generally AC system have three basic loads, i.e. resistive, inductive and capacitive. In case of purely resistive load, the current and voltage are in phase. Whereas, in case of inductive load, current lags behind the voltage. In industries, most of the equipment and appliances are inductive in nature. In case of capacitive load current leads the voltage.

 

Mostly capacitors are installed for power factor correction of system . Inductive or capacitive loads are termed as the reactive loads. In this loads active power can only be consumed in resistive portion of load, where the current and voltage are in phase. Reactive component of the load consumes reactive power which is necessary for energizing the magnetic circuit of the equipment and is not useful for work.

 

Inductive loads are with two current components, one is active current & another is reactive current. Vector sum of these two power components (active and reactive) is termed as Apparent Power (measured in kVA). The ratio of active power (kW) to apparent power (kVA) is known as power factor.

 

In case of resistive load kVAr (reactive component) is absent, so angle φ will be zero degree, hence power factor will be unity. For a inductive load the power factor will be lagging and for capacitive load the power factor will be leading.

 

Thus it is clear that, if the power factor is different than unity (low power factor), more will be the kVA demand for same kW load. Most of the HT tariffs include kVA Demand charges along with Energy Charges, more the kVA demand for the same kW load more will be the electricity bill to consumer.

 

Disadvantages of Poor Power Factor:

Load draws high current for same value of useful power

1. Which results in increase in size of the switchgear, cable, transformer etc. All this adds to the cost.

2. High current causes increased power loss (I2R loss) in the circuits. The conductor temperature increases and hence the life of                      insulation gets reduced.

3. It increases voltage drop which affects different loads as below:

• Reduces the illumination of lighting lamps.
• Heating devices operates at reduced temperature, results in increased consumption & process time.
• It leads to nuisance tripping of Induction motor on overload.

 

Advantages of Improved Power Factor:

• Reduces losses in the system, cables, lines, and feeder circuits and hence lower sizes could be selected.
• Improves system voltage & helps to all types of load to operate at rated capacity with designed output.
• System capacity Increases (kVA) for the same kW, permits additional loading.

 

Range: APFC panels with & without series reactor for any capacity LT & HT system.

We are offering ht capacitor. Available up to 10mvar capacity with de tuned harmonic filters. Indoor and out door mounted.