THREE PHASE VOLTAGE MONITORING RELAY RNPP-311M

RNPP-311M voltage monitoring relay is designed for protection of three phase loads against major types of mains faults, such as:

• RMS voltage reaching beyond admissible thresholds – over and under voltage
• Phase loss or Single phasing
• Phase sequence order violation or reverse phase sequence
• Phase coincidence or shorting of two or more phases
• Phase Imbalance or asymmetry

The device performs monitoring of the main circuit parameters and de-energizes (trip) load when the parameters fall beyond specified boundaries.

The front panel LEDs display the following:

• Presence of true RMS voltage in the mains
• Load status (On/Off)
• Type of fault

Adjustment potentiometers allow for setting:

• Tripping threshold for the minimum/the maximum voltage, (% of the rated voltage)
• Time delay for load re-energizing (reset) after the circuit parameters recovery
• Tripping time delay for load de-energizing (trip) in case of all circuit voltage faults