The voltage, phase imbalance, and phase sequence relay RNPP-313 is designed for:

• Monitoring the permissible voltage level.
• Controlling the correct phase sequence and detecting phase sticking.
• Monitoring phase completeness and voltage symmetry (phase imbalance).
• Disconnecting the load in case of poor network voltage quality.
• Assessing voltage quality after load disconnection and automatically reactivating the load once voltage parameters are restored.
• Displaying fault conditions in case of an emergency and indicating the presence of voltage on each phase.
• Detecting neutral wire breakage.
• The device allows for adjustable response delay time for phase imbalance protection. Once the network voltage parameters are restored, the relay automatically reconnects the load after the auto-reclosing delay (APR).

RNPP-313 Operating Modes:

• Minimum Voltage Monitoring: If the voltage drops below 195V, the protected equipment will be disconnected from the network.
• Maximum Voltage Monitoring: If the voltage exceeds 260V, the protected equipment will be disconnected from the network.
• Phase Presence Control: If one of the phases is lost, the protected equipment will be disconnected from the network.
• Incorrect Phase Sequence and Phase Sticking Control: If the phases are connected incorrectly or if one phase sticks, the protected equipment will be disconnected from the network.
• Phase Imbalance Control: If the voltage difference between phases exceeds 40V, the protected equipment will be disconnected from the network.
• Neutral Wire Break Control: In the event of a neutral wire break, the protected equipment will be disconnected, and the LINE and OFF indicators will turn off.
• Permanent Phase Presence Monitoring: This feature remains active in all operating modes.
• In all modes, the device responds to phase loss or voltage drop below 100V on one or more phases within a fixed response time of 0.25 seconds.

Advantages:

• Connection via a contactor.
• Changeover contact.
• Extremely compact size.
• Easy setup.

Applications:

• Monitoring phase and line voltages in a three-phase network.
• Protecting three-phase or, in some cases, single-phase equipment from electrical faults in a three-phase network, including voltage anomalies, incorrect phase sequencing, phase sticking, phase loss, and voltage asymmetry.
• Ideal for protecting refrigeration and ventilation systems.
• Suitable for compact control panels where space savings are critical.

Key Features:

• Monitoring the permissible RMS voltage level.
• Controlling phase sequence correctness and detecting phase sticking.
• Monitoring phase completeness and voltage symmetry.
• Disconnecting the load by breaking the power circuit of the contactor coil when protection conditions are met.
• Assessing network voltage quality after load disconnection and automatically restoring the load once voltage parameters normalize.