Static LV Power Factor Corrector

PMI Electronic pf Corrector Systems (LV applications) provide thyristor based fast correction with 20 msec response time. The uniqueness of PMI Electronic pf Corrector Systems is that there is real ZERO CURRENT switching which is made through 6 thyristor – Diode modules positioned at 6 arms with binary logic, which means 64-step capacitive correction, unlike popular switching techniques which uses slow and deficient mechanical contactors. At each arm, also harmonic filters, connected serial to capacitors are used, which not only limit the current going to capacitors but also suppress the system harmonics at 189 Hz perfectly, the result being that the capacitor life is extended up to its full life time almost without replacement. Because we use semiconductor-switching as opposed to contactor-switching, there is increased reliability. Response speed is 20 msec which is well suited for fast changing, tough loads.

  • Electronic PF Corrector based on Thyristor – Diode switching topology for real zero current switching that ensures no voltage fluctuation, no current peaks, no dangerous transients and line pollution during capacitor switching
  • Increased capacitor life with zero current switching, no switching stress on components
  • Response time is 20 msec. for fast changing loads.
  • Each phase controlled independently enabling the device to handle unbalanced loads at optimum level.
  • 32 step or 64 step capacitive and 2 step inductive sensitivity correction
  • Semiconductor switching increases reliability.
  • Periodic test of capacitors and semiconductors gives prior failure detection.
  • Modular construction and easy service.
  • Remote communication supervision and monitoring.
  • Parallel operation with old compensation system to improve total performance.
  • Easy construction with standard current transformer.
  • Energy saving with unbalanced loads.
  • Solves current harmonics with harmonic filters.
  • EKM Series solution for unbalanced loads
  • Series inductors for damping PFC capacitors

EKM

INPUT & CONTROL
ModelEKM
1 Phase Power Options22,5 / 45 / 90 / 135 / 180 / 270 / 360 Kvar/440VAC
Working TechniqueThyristor/Diode Zero Current Switching
Correction TecniqueEach Phase Independent Measurement (1Phase) / Each Phase Measurement (3Phase)
ControllingdsPIC Microcontroller
Efficiency>90%
Isolation Voltage2.500 VAC (Between Input-Output, Input-Case, Output-Case)
Correction Tolerance±%2 VAR
Capacitive Step Number32 / 64 (for 22,5 KVAr 32 Steps, for more than 22,5KVAr 64 Steps)
INPUT
Nominal Input Voltage380/400 VAC (3 Phase)
Input Voltage Tolerance±20%
Nominal Input Frequency50 – 60 Hz (Optional)
Input Frequency Tolerance±5%
Power Factor>0.8
Input ProtectionThermal-Magnetic Overcurrent, Overvoltage ve EMI-RFI Filter
Momentary Voltage and Impact ProtectionIEEE 587 (4500 A, 110 Joules)
DIGITAL FRONT PANEL
Indicator ve Buttons2 x 16 LCD Panel, Menu Choosing and Parameter Adjust Buttons
Warning MessagesInput Voltages Normal/Overvoltage/Undervoltage,Input Fuse Open/Close,Overtemperature,Temperature Normal,Insufficient Correction,Over THD,Correction Normal,Communication Failure/Normal,Device Failure/Normal,Self Test Start/End
Monitorring ParametersCos Fi L1/L2/L3, PF L1/L2/L3/Total, Input Voltages L1/L2/L3, Apperant Power (VA) L1/L2/L3/Total, Active Power(W) L1/L2/L3/Total, Reaktive Power (VAR) L1/L2/L3/Total
Adjustable ParametersCapacitive / Inductive Side Working,Date/Time ,Alarm Volume Level,Communication Address,LV/HV Operate
Voiced AlarmDuring Indication Messages in 2 seconds 2 short “Bip”
CommunicationMonitorring and Adjusting Parameters over Computer via RS-232 ve RS-485, 256 Event Logs, GSM communication (Option), TCP/IP
ENVIRONMENT
CoolingAC Fan (Standard) / Natural Cooling (Option)
Elektrically Noise ReducingFCC Part 15 Class B
Cabin Protection LevelIP20 / RAL7035 as standard, (Higher IP rating and different colors are available, please consult)
Nominal Temperature -10 / +40 °C (Higher operating temperatures are available, please consult )
Relative Humidity90%
Working HeightMaximum 1.000 Mt (Higher altitudes requires de-rating, please consult )
Noise LevelMax. 60dB in 1 Meter Dıstance
Electrical Standarts EN 50091-1 (Safety) / EN 50091-2 (EMC)

EKT

INPUT & CONTROL
ModelEKT
1 Phase Power Options75 / 150 / 230 / 310 / 460 / 620 kVA/440VAC
Working TechniqueThyristor/Diode Zero Current Switching
Correction TecniqueEach Phase Independent Measurement (1Phase) / Each Phase Measurement (3Phase)
ControllingdsPIC Microcontroller
Efficiency>%90
Isolation Voltage2.500 VAC (Between Input-Output, Input-Case, Output-Case)
Correction Tolerance±%2 VAR
Capacitive Step Number32 / 64 (for 75 KVAr 32 Steps, for more than 75 KVAr 64 Steps)
INPUT
Nominal Input Voltage380/400 VAC (3 Phase)
Input Voltage Tolerance±20%
Nominal Input Frequency50 – 60 Hz (Optional)
Input Frequency Tolerance±5%
Power Factor>0.8
Input ProtectionThermal-Magnetic Overcurrent, Overvoltage ve EMI-RFI Filter
Momentary Voltage and Impact ProtectionIEEE 587 (4500 A, 110 Joules)
DIGITAL FRONT PANEL
Indicator ve Buttons2 x 16 LCD Panel, Menu Choosing and Parameter Adjust Buttons
Warning MessagesInput Voltages Normal/Overvoltage/Undervoltage,Input Fuse Open/Close,Overtemperature,Temperature Normal,Insufficient Correction,Over THD,Correction Normal,Communication Failure/Normal,Device Failure/Normal,Self Test Start/End
Monitorring ParametersCos Fi L1/L2/L3, PF L1/L2/L3/Total, Input Voltages L1/L2/L3, Apperant Power (VA) L1/L2/L3/Total, Active Power(W) L1/L2/L3/Total, Reaktive Power (VAR) L1/L2/L3/Total
Adjustable ParametersCapacitive / Inductive Side Working,Date/Time ,Alarm Volume Level,Communication Address,LV/HV Operate
Voiced AlarmDuring Indication Messages in 2 seconds 2 short “Bip”
CommunicationMonitorring and Adjusting Parameters over Computer via RS-232 ve RS-485, 256 Event Logs, GSM communication (Option), TCP/IP
ENVIRONMENT
CoolingAC Fan (Standard) / Natural Cooling (Option)
Elektrically Noise ReducingFCC Part 15 Class B
Cabin Protection LevelIP20 / RAL7035 as standard, (Higher IP rating and different colors are available, please consult)
Nominal Temperature -10 / +40 °C (Higher operating temperatures are available, please consult )
Relative Humidity90%
Working HeightMaximum 1.000 Mt (Higher altitudes requires de-rating, please consult )
Noise LevelMax. 60dB in 1 Meter Dıstance
Electrical Standarts EN 50091-1 (Safety) / EN 50091-2 (EMC)

Comparison between PMI PFC & Conventional Systems

Switching Currents in Conventional (Contactor Based) Systems

In conventional pf correction systems, capacitors are switched by contactors which causes arcs, electrical noise and transient voltages on the network.

Zero Current Switching in PMI Electronic PF Corrector Systems

Thyristor – Diode switching topology for real zero current switching that ensures no voltage fluctuation, no current peaks, no dangerous transients and line pollution during capacitor switching. Increased capacitor life and no switching stress on components

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