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Single Phasing Preventers (SPP)
Motor Guard Relay
Pumppro
Liquid Level Controller
Single Phase & Three Phase Electronic Starters
Overload relay
Earth Leakage Relay(ELR)
Industrial Energy Saving Tube Fittings & Ballasts
Industrial Lighting Fixtures
Automatic Light Control Switch (Auto photo)
Servo Voltage Stabilizer
Digital Time Switch
 
Temperature Controller /
Temperature Indicator
Analog Timers
Counters
Panel Meters
Whitez Modular Switches
Servo Voltage Regulators (SCVR)
System Monitoring Relays
Digital Timer
Phase Failure Relays / Motor-Pump Protection Relays

Introduction

 

90% of total burn out of the motors are mainly due to overloading caused by unbalanced voltage conditions or phase failure. This fault remains undetected by conventional bimetallic overload relays and need a negative sequence component of voltage or current sensing single phasing preventer. They trip the motor starter if it goes beyond the set level of voltage or current.

GELCO current and voltage sensing SPP offers protection up to motor terminals and does not allow motor to start under unfavorable supply conditions. The negative sequence current sensing is the best principle for single phasing protection.

 

Technical Details

 
Single Phasing:

If any one phase is removed, the unit will trip the motor

Voltage sensing SPP:

It gives protection at sensing points only. It senses negative sequence component of voltage and protects the motor against phase failure, unbalanced supply and reverse phase sequence of voltage.

Current sensing SPP:

It gives protection up to motor terminals. It senses negative sequence component of current and protects motor against phase failure, reverse phase sequence and unbalanced supply of the current (> 50% of rated maximum current)

Reverse phasing:

When phase sequence is reversed, motor rotates in reverse direction. This condition is not desirable to run the motor, so the unit will trip the motor.

Unbalanced supply current and voltage:

Unit gives protection against unbalance voltage or current. If voltage unbalance is higher then 45+/- 5V, unit trips. If current in any tow phase differs by 50% (10 A) of rated maximum current (20 A in case of 8-20 A unit) it trips motor.

Low/High voltage cut-off: It senses supply voltage and protects the motor against too high or too low voltage conditions.
Overload:

It senses average current going to motor and protects motor against overload (over current). Overload setting is to be set at 120% of the full load current.

Dry run:

When motor operates without load (i.e. water pump without water), the condition is considered as dry-run. Prodless dry-run setting is to be set depending upon no-load current of the motor else it may cause the miss-tripping of the motor.

 
 
 

All Models protect motor against single Phasing, High/Low voltage,Reverse Phasing and Unbalanced Supply voltage condition. It can be used for any HP rated motor. Trip time delay is provided to avoid mis tripping of the motor.
 

Available Models

Models\Features

Unbalance Voltage Low Volt High volt Reset Remark
MINNY 45 V +/- 5V - - Auto Volatage Sensing SPP in small size
NSV-W 45 V +/- 5V - - Auto Volatage Sensing SPP in rigid construction
NSV-W1 Adjustable
(30-70V)
Cut off : 320 V +/- 5V
Cut in : 340 V +/- 5V
Cut off : 500V +/- 5V
Cut in : 470 V +/- 5V
Manual Volatage Sensing SPP with adjustable unbalance voltage
NSV-CG 45 V +/- 5V Cut off : 320 V +/- 5V
Cut in : 340 V +/- 5V
Cut off : 500V +/- 5V
Cut in : 470 V +/- 5V
Auto Volatage Sensing SPP with High/Low voltage protection
NSV-CG1 45 V +/- 5V Adjustable
(300V-380V)
Adjustable
(450V-500V)
Auto Volatage Sensing SPP with adjustable High/Low volt
SWG 45 V +/- 5V Cut off : 320 V +/- 5V
Cut in : 340 V +/- 5V
Cut off : 500V +/- 5V
Cut in : 470 V +/- 5V
Auto Volatage Sensing SPP with Wate Level Guard
NSC - Cut off : 320 V +/- 5V
Cut in : 340 V +/- 5V
Cut off : 500V +/- 5V
Cut in : 470 V +/- 5V
Manual Current Sensing SPP 50% of rated maximum current
NVC 45 V +/- 5V Cut off : 320 V +/- 5V
Cut in : 340 V +/- 5V
Cut off : 500V +/- 5V
Cut in : 470 V +/- 5V
Auto Voltage & Current Sensing SPP 50% of rated maximum
 
Note:SWG:SPP with water Water Level Guard(YES and NO indication provided to check the water level on the unit).
 
Technical Specifications
System Voltage: 415 V +/- 20%, 3, 50 Hz
Auxilliary Supply: 415V / 215 V / 110 V +/-20%,50 Hz
Output Contact Rating: 1 C/o potential free,6A resistive at 230v or
1A at 415V at 0.5 P.F.
Trip Time Delay  
For single phasing, reverse phasing
Unbalance & Low/High Voltage:
4-7 secs
Recommand Wiring: 1.0 Sq. mm
Humidity: Up to 95%RH
Enclosure: High impact polystyrene moulded with nylon modulded connection strip
Fail safe: Relay is energised in healthy conditions and trips in faulty conditions
Indication  
NSV W : HEALTHY
NSV CG/NSV-CG1: ON,PHASE FAIL,L.V.,H.V
NSV W1: POWER ON,SPP FAULTY
NSC: SUPPLY,SPP TRIP
NVC: CURRENT SPP HEALTHY, VOLTAGE SPP FAULTY, LOW VOLT, HIGH VOLT
SWG: SPP FAULTY,LOW VOLT,HIGH VOLT,YES,NO,ON
Dimension  
Overall: Minnary-102 X 65mm
Others-140 X 100 X 95mm
Mounting: Minary-82 X 48
  Others-129 X 74
CT Dimensions  
Inbuilt: 16 mm ID
Seperate: 31 mm ID
Weight: Minny-250 gms (approx.)
others-600 gms (approx.)
 
 
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