Power Factor Correction Guides

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32 technical guides for choosing Power Factor Correction products: selection criteria, standards, common mistakes and frequently asked questions.

What Is a Single-Phase Reactive Power Control Relay? Types and Selection Criteria — A single-phase reactive power control relay measures one phase through a single current transformer and switches power factor correction capacitor steps in and out.
What Is an Active Harmonic Filter? Types and Selection Criteria — An active harmonic filter (AHF) measures the harmonic currents drawn by the load with current transformers and generates their opposite to stop them reaching the grid.
What Is a Capacitor Discharge Unit? Types and Selection Criteria — A capacitor discharge unit is a discharge coil or resistor that quickly drains the voltage left in a power factor correction capacitor after it is switched off.
What Is a Power Quality Analyzer? Class A, Class S and Selection Criteria — A power quality analyzer measures grid events such as voltage sags, interruptions, harmonics, flicker and imbalance by standard methods and records them with timestamps.
What Is a Standard Type Static Capacitive Module? Models and Selection — A standard type static capacitive module is a capacitive static contactor that connects a capacitor step in a correction panel by thyristor, without an inrush surge.
What Is a Three-Phase Box-Type Power Capacitor? Selection Criteria — A three-phase box-type power capacitor is a kVAr-rated capacitor with its elements in a rectangular housing, used in correction panel steps and for fixed correction at motors.
What Is an Energy Analyzer I/O Module? Types and Selection Criteria — An energy analyzer I/O module is an expansion unit fitted to a compatible analyzer to give it digital inputs, digital outputs, relays or analogue outputs.
What Is an SVC Inductive Load Driver? Rating Match and Selection Criteria — An SVC inductive load driver is an electronic module that drives the single-phase shunt reactor on each phase steplessly from 0 to 100% with thyristors on an SVC relay's command.
What Is a Single-Phase Shunt Reactor? Uses and Selection — A single-phase shunt reactor is a 230 V power factor correction coil connected between phase and neutral that balances excess capacitive power in that phase.
What Is a Single-Phase Power Capacitor? Types and Selection Criteria — A single-phase power capacitor is a two-terminal power factor correction capacitor, rated in kVAr, connected between phase and neutral or between two phases.
What Is a Single-Phase Harmonic Filter? Types and Selection Criteria — A single-phase harmonic filter is a reactor connected in series with a single-phase power capacitor that protects that step against harmonic currents and resonance.
What Is a Power Factor Correction Contactor? Operation and Selection Criteria — A power factor correction contactor is a contactor that limits the inrush current of a capacitor step with early-closing contacts and pre-insertion resistors.
What Is a Run Capacitor? Types and Selection Criteria — A run capacitor is a metallised polypropylene film capacitor wired in series with the auxiliary winding of a single-phase induction motor and kept in circuit while the motor runs.
What Is a Three-Phase Harmonic Filter? Connection and Selection — A three-phase harmonic filter is a reactor in series with a correction capacitor that pulls the step's resonance below the dominant harmonics and protects the capacitor.
What Is a Panel-Mount Power Network Analyzer? Types and Selection Criteria — A panel-mount power network analyzer is a door-mounted device that measures voltage, current, power, energy and harmonics, shows them on screen and sends them over communication.
What Is a DIN Rail Power Network Analyzer? Types and Selection Criteria — A DIN rail power network analyzer is a measuring device that measures voltage, current, power and energy and mounts on a 35 mm DIN rail like other modular devices.
What Is a Start Capacitor? Types and Selection Criteria — A start capacitor is a short-duty electrolytic capacitor that gives a single-phase induction motor extra starting torque and is switched out once the motor speeds up.
What Is a Reactive Power Control Relay? Single-Phase vs Three-Phase — A reactive power control relay monitors a plant's reactive power using current transformer readings and switches capacitor or reactor steps in and out of a compensation panel.
What Is SVC Compensation? System Parts and Selection Criteria — An SVC drives single-phase shunt reactors steplessly with thyristors to balance capacitive reactive power on each phase; it consists of a relay, driver and reactors.
What Is a Contactor Switching Module (Static Contactor)? Selection Criteria — A contactor switching module (static contactor) is a semiconductor switch that connects and disconnects capacitor steps in a PFC panel with thyristors instead of mechanical contacts.
What Is a Thyristor Capacitive Module? Operation and Selection — A thyristor capacitive module is a static switching module that connects capacitor steps in a power factor correction panel with thyristors when the voltage across the switch is near zero.
What Is a Harmonic Filter Reactor? Ratios and Selection Criteria — A harmonic filter reactor is a coil connected in series with a power factor correction capacitor that pulls the step's resonant frequency below the dominant harmonics on site.
What Is a Three-Phase Reactive Power Control Relay? Steps and Outputs — A three-phase reactive power control relay measures each phase through its own current transformer and switches capacitor and shunt reactor steps phase by phase.
What Is a Three-Phase Shunt Reactor? Uses and Selection — A three-phase shunt reactor is a power factor correction coil connected in parallel with the 400 V network that draws inductive reactive power to balance capacitive excess.