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Three Phase Voltage Monitoring Relay - VMR 3P :

Three Phase Voltage Monitoring Relay Protection of 3 Phase devices against Over voltage, Under voltage,Single Phasing, Reverse Phasing & unbalance supply are one of the major issue in electrical systems. For safe running of 3-phase devices, special protections that keep a continuous watch on supply conditions are very essential. The major cause of maxium load burn-out is overloading which occurs due to unbalance supply, Single Phasing & Reverse Phasing conditions.

VMR3P detects such Conditions & protect the load from burn out. 'PROTON's LVM 3P' offer above protections along with 3 digit display showing R-Y,Y-B,BR voltages in scanning mode with precise accuracy. LOW/HIGH voltage tripping to ensure trouble free running of 3-phase Loads.

SALIENT FEATURES :

  • Microcontroller based technology.
  • Voltage protection along with digital voltage readout.
  • Wide range of supply variation.
  • Unit will also work if any one phase is present.
  • Protection against Under voltage.
  • Protection against Over voltage.
  • Single Phasing & Reverse Phasing protection.
  • All the set points setable by keys.
  • Phase unbalance protection.
  • Trip Delay for Under voltage & Unbalance is settable
  • Reverse Phasing Protection can be able to bypass through settings.
  • Indications for Low voltage , High Voltage, SPP & Relay ON .
  • Message Display for SPP, Reverse Phasing & Unbalance Faults.
  • No separate auxiliary supply required.
  • Hold feature:- Press INC key in Running condition to observe particular supply voltage.

TECHNICAL SPECIFICATION :

Supply Voltage 3 Phase 415 VAC, 50 Hz (R,Y,B &N) (No auxilliary supply)
Output Contacts Two changeover ( C-NO),Rating 5A at 230VAC
Voltage trip setting : Lower Limit is 340 for Under voltage (Resolution of 1 Volt)
: Upper Limit is 460 Volts for OV (resolution of 1 V)
( Hysterisis between cut off & cut in is 10V)
Trip Time delay Trip time Less than 100msec.for SPP, Reverse Phasing & Over Voltage Trip Time is settable for Under Voltage & Unbalance..
ON Delay Selectable by keys from 1 to 60 sec.
Reset Mode Auto reset
Indications SPP : RED LED
OVER VOLTAGE : RED LED
UNDER VOLTAGE: RED LED
RELAY ON : GREEN LED
Keys [ SET ] FUNCTION key, To select a set point function.
[ /\ ] INC key, To increment set point.
[ \/ ] DEC key, To Decrement set point.
Operating Temperature range -5 0C to 60 0C.
Relative Humidity 10 to 95%
Mounting Din rail. : Base mounting dimensions 55 (W) x 65 (L) x 125 (D) mm.

WORKING :

In the normal run mode, display shows Voltages Vry,Vyb,Vbr for 10 sec. each If the supply is within the range then On Timer starts decrementing on display & after Set On Time over Relay will be ON.

If Over voltage,Under voltage or spp/reverse phasing/unbalance occurs in the supply then Relay will be OFF & corresponding

fault LED starts blinking.

Hysterisis betwen Cut off & cut in is 10V

- Hold feature:- Press INC key in Running condition to observe particular supply voltage. To go into scroll mode press INC key again.

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