Reactive Power Control Relays

A reactive power control relay is a power factor correction relay that measures the facility's power factor and automatically switches capacitor steps and, depending on the model, shunt reactor steps on and off; it is chosen by number of steps, measurement connection (single-phase or three-phase), the step types it can connect and communication capability. In a power factor correction panel, it commands contactors or thyristor modules based on the measurement it takes from the current transformer, and it is used to keep the facility's inductive and capacitive reactive energy ratios within the limits set by regulation. The category includes single-phase and three-phase measuring Entes and Tense relays and ABB RVC and RVT2 models; 12, 18 and 24 step options, options with RS-485 communication and SVC-compatible options (with TCR output) are available. In facilities where the phases are evenly loaded, a relay measuring with a single current transformer may be sufficient; in unbalanced facilities where single-phase loads predominate, a relay that measures the three phases separately is preferred. The relay only provides control; the reactive power is supplied by the capacitor and reactor steps, and the current information comes from the current transformer.

Products

How to choose Reactive Power Control Relays

A reactive power control relay is a power factor correction relay that measures the facility's power factor and automatically switches capacitor steps and, depending on the model, shunt reactor steps on and off; it is chosen by number of steps, measurement connection (single-phase or three-phase), the step types it can connect and communication capability. In a power factor correction panel, it commands contactors or thyristor modules based on the measurement it takes from the current transformer, and it is used to keep the facility's inductive and capacitive reactive energy ratios within the limits set by regulation.

  • Take reactive power demand and harmonic distortion levels from site measurements or project calculations.
  • Compare kVAr step sizes, rated voltage and step count against the compensation panel layout.
  • Select capacitor duty contactors, harmonic filter reactors and discharge resistors together with the capacitor bank.

Frequently asked questions

What is Reactive Power Control Relays and where is it used?

A reactive power control relay is a power factor correction relay that measures the facility's power factor and automatically switches capacitor steps and, depending on the model, shunt reactor steps on and off; it is chosen by number of steps, measurement connection (single-phase or three-phase), the step types it can connect and communication capability. In a power factor correction panel, it commands contactors or thyristor modules based on the measurement it takes from the current transformer, and it is used to keep the facility's inductive and capacitive reactive energy ratios within the limits set by regulation.

What should I compare when choosing Reactive Power Control Relays?

Compare the intended use, technical values, dimensions, connection type and compatibility shown on each product page.

Which product groups are available under Reactive Power Control Relays?

The current subcategories include Single-Phase Reactive Power Control Relays, Three-Phase Reactive Power Control Relays. Open a subcategory to compare its products and technical details.

Reactive Power Control Relays Selection Guide: Technical Criteria and Engineering Practice