Single Stage, Neutral Displacement
₹8,758.75
Product Code: JRV 062
Time line :Products will be shipped within 3 weeks from the date of order
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Product Description
Features
- Software based design
- Instantaneous/ Definite time selection
- Insensitive to voltages at third harmonic frequencies
- Wide setting range
- Wide auxiliary range
APPLICATION
Neutral Displacement Relay is used for protection of motors, generators and capacitor banks.
PRINCIPLE OF OPERATION
NDR is a voltage operated relay and get's sensing voltage from open delta secondary of potential transformer.
Whenever there is a ground fault in one phase, the voltage in other two phases will rise and generate a sensing voltage which is continuously monitored in the relay. When this voltage exceeds the set value the internal relay operates. The Relay contacts can be used for Alarm & Trip purpose.
The Relay contacts are self reset type and indications are latched. The RESET button provided on the front of relay to clear these latched indications. The TEST button is provided to test the relay contacts for the trip and alarm circuits.
Ratings
Settings
Over Load Ratings
Burden
Accuracy
Voltage rating :
63.5V/ 110V AC
Aux. Supply :
1)20V to 60V DC
2)75V to 150V AC/DC
3)175V to 300V DC / 185V to 250V AC
2)75V to 150V AC/DC
3)175V to 300V DC / 185V to 250V AC
Voltage setting :
2.5% to 80% in steps of 2.5%
Definite time :
0 to 25sec in steps of 0.1sec
Voltage input :
2 times rated continuous
Voltage input :
Less than 2VA at rated
Auxiliary supply :
Less than 2W( Non operated)
Less than 5W(Operated)
Less than 5W(Operated)
Operating time :
+/- 5%
Operating time :
+/- 5% or +/- 30msec
Instantaneous time :
Less than 40ms
Drop-off to pick up ratio :
80% to 95%
Contact Ratings
Contact Durability
Insulation
STANDARD COMPLIANCE
Ratings :
10A at 24V DC / 230V AC
Unloaded contact :
1,00,000 operations
Loaded conatct :
10,000 operations
- 2KV RMS, 50 Hz for 1 minute / 2.5 KV for 1s .
Between all terminals and cases . - 1 KV RMS, 50 Hz for 1 minute across open contacts
Weight:
Approx. 1500 gms
Case Size :
144sqmm with a depth of 117mm
Installation :
Flush mounting
Panel cutout :
138 X 138 mm
Accuracy test :
IEC 60255-151
Insulation test :
IEC 60255-27
TERMINAL DIAGRAM
