Three Phase Voltage Monitoring Relay Vmr 3P
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 Specifications
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. |
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[ \/ ] 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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