Three Phase Voltage Monitoring Relays

Product Details:

RNPP-302 numeric voltage monitoring relay is designed for protection of three phase loads against major type of mains faults, 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
• Contactor output side monitoring - full phase switching, contactor health

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

The three digit, seven segment LED display on the relay front panel allows to:

• Continuously indicate the true RMS circuit voltage - phase voltage or line voltage
• Indicate type of occurring fault
• View (visualize) settings of modes and programming parameters

The menu allows the user to make the following settings:

• Mode of voltage indication for each phase
• Mode of the relay reaction to the digital input for remote de-energizing (tripping)
• Type of relay - phase voltage or line voltage
• Method for setting the voltage deviation
• Turn on/off the phase imbalance monitoring
• Turn on/off the phase sequence order monitoring
• Contactor output terminals voltage monitoring
• Type of measured voltage - 220/380 V, 230/400 V, 240/415 V
• The maximum allowable voltage tripping threshold
• The minimum allowable voltage tripping threshold
• Allowable phase imbalance threshold - %
• Automatic reset delay time
• Min voltage de-energize (tripping) delay time
• Max voltage de-energize (tripping) delay time
• Phase imbalance tripping delay time
• Phase loss tripping delay time
• Delay time for tripping upon a digital input (external emergency button input)
• Monitoring of full phase switching of contactor (output side monitoring)

The device is equipped with an additional alarm/annunciation relay with normally open contacts lead out.

Documentation for this device

Additional Information:

• Item Code: RNPP-302
• Port of Dispatch: New Delhi

Product Details:

The RNPP-301 voltage monitoring relay is designed for protection of three-phase loads against major type of mains faults, as:

• RMS voltage reaching beyond admissible thresholds
• Phase sequence order violation and phase coincidence
• Violation of the mains voltage phase completeness and symmetry

The device performs monitoring the main circuit parameters and de-energizes load when the parameters fall beyond specified boundaries. The relay also tracks the status of magnetic starter power contacts at no-load and under load while monitoring their operability (burning or sticking).

The front panel LEDs display the following:

• Presence of voltage in the mains
• Load status (ON/OFF)
• Type of fault

Six variable pot knobs on the front panel allow for setting:

• The maximum allowable voltage tripping threshold
• The minimum allowable voltage tripping threshold
• Allowable phase imbalance threshold
• Tripping time delay for load de-energizing in case of emergency voltage reduction
• Tripping time delay for load de-energizing in case of other circuit faults
• Time delay for load re-energizing after the circuit parameters recovery

The device can function a phase- or line- voltage monitor (user-selected). Three modifications of this device are currently produced.

Documentation for this device

Additional Information:

• Item Code: RNPP-301
• Port of Dispatch: New Delhi

Product Details:

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

With DIP switches on the device’s front panel the user can select the type of circuit monitored 400 / 415V, and turn on/off monitoring of the following circuit parameters:

• Phase sequence
• Phase imbalance or asymmetry
• Under voltage
• Over voltage

Corresponding combinations of the RNPP-311M switches allow for functioning in various modes:

• Mode of circuit voltage comprehensive monitoring
• Minimum/the maximum voltage monitoring mode
• Minimum voltage monitoring mode
• Maximum voltage monitoring mode
• Phase presence monitoring mode
• Phase sequence violation and phase coincidence monitoring mode
• Phase imbalance monitoring mode; and other modes

The phase availability monitoring function is maintained in any position of the switches, including OFF position. The feature of 24V DC online power supply is available (optional).

Documentation for this device

Additional Information:

• Item Code: RNPP-311M
• Port of Dispatch: New Delhi

Product Details:

RNPP-312 has been designed:

• for monitoring the permissible voltage level;

• for monitoring the correct alternation and absence of sticking of phases;

• for monitoring the full-phase and symmetry of the mains voltage (phase imbalance);

• to disconnect the load in case of improper mains voltage;

• for monitoring the quality of the mains voltage after switching off the load and automatically turning it on after restoring the voltage parameters;

• to indicate the failure in the event of emergency situation and the presence of voltage in each phase.

The device provides the possibility of adjusting the parameters (voltage threshold, time of automatic reclosing and time delay of protection operation), selection of the voltage of the monitored mains (400 V or 415 V) and a set of protective functions. After restoring the voltage parameters of the mains, the device enables again the load after the reclosing time.

RNPP-312 can be operated in the following modes:

• “Minimum and maximum voltage control";

• “Minimum voltage control";

• “Maximum voltage control";

• "Phases presence control" (Single Phasing);

• "Control of incorrect phase sequence; 

• "Presence of phase sticking" (short circuit);

• "Phase imbalance/assymetry control".

Protections can be turned ON/OFF through built-in DIP switch.

The failure is displayed in order of priority:

1 – Phase failure or voltage drop below 100 V (highest priority);

2 – Phase sequence;

3 – Minimum and maximum voltage;

4 – Phase imbalance.

Additional Information:

• Item Code: RNPP-312
• Port of Dispatch: New Delhi

Product Details:

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

• RMS voltage reaching beyond admissible thresholds
• Phase sequence order violation and phase coincidence
• Violation of the mains voltage phase completeness and symmetry

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

The front panel LEDs display the following:

• Presence of voltage in each phase
• Emergency de-energizing the load

The trip setting for the maximum/minimum voltage threshold is combined and is set by adjustable potentiometer as percentage of the rated voltage. RNPP-311 automatically energizes load upon expiration of the AR (automatic restart time) since the moment of the mains parameters recovery. The devices are manufactured with standard AR delay set to 5 sec, but optionally, they can be manufactured with the AR delay presets of 0, 10, 60, 100, 150, 200 and 250 sec.

Documentation for this device

Additional Information:

• Item Code: RNPP-311-1
• Port of Dispatch: New Delhi