Two Stage, Neutral Displacement Relay
₹13,048.75
Product Code: JRV 064
Time line :Products will be shipped within 3 weeks from the date of order
Stock In Stock
Viewed 5479 times
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 :
20 to 60V DC
75 to 150V DC
175 to 300V DC / 185-250V AC
75 to 150V DC
175 to 300V DC / 185-250V AC
Voltage setting
Setting range (for Stage 1 and 2 :
Setting range (for Stage 1 and 2 :
2.5% to 80% in steps of 2.5%
Definite time
Setting range (for Stage 1 and 2:
Setting range (for Stage 1 and 2:
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 value :
+/- 5%
Operating time :
+/- 5% or +/- 30msec
Instantaneous time :
Less than 40millisec
Drop-off to pick up ratio :
80% to 95%
Contact Ratings
Contact Durability
Insulation
STANDARD COMPLIANCEM
Ratings :
10A at 24V DC / 230V AC
Unloaded contact :
1,00,000 operations
Loaded conatct :
10,000 operations
- 2 KV RMS,50 Hz for 1 minute/2.5KV for 1s.
Between all terminals and case - 1 KV RMS, 50 Hz for 1 minute across open contacts as per IEC 60255
Weight :
Approx. 1500 gms
Size :
144 sq mm with depth of 232 mm
Installation :
Flush mounting
Panel cutout :
138mm x 138mm
Accuracy test :
IEC 60255-151
Insulation test :
IEC 60255-27
TERMINAL DIAGRAM
