Two Stage, Neutral Unbalance Current Relay
₹12,155.00
Product Code: JRC 124
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
- Insensitive to harmonics
- Wide setting ranges
- Trip test facility
Application
Neutral unbalance current protection of double star capacitor banks with floating neutral.
Principle of Operation
The sensing current is converted to voltage by an internal resistor and this voltage is fed to a
harmonic network which is tuned to fundamental frequency. The output of filter is fed to voltage
comparator. When the sensing current signal at the fundamental frequency exceeds the set
value, the comparator gates a train of pulses to the processor. The program residing in the CPU
performs the function of control and also gives output signals for relay and LED driver circuits.
The operation of the relay is indicated by the glowing of a 'Red' LED,which has to be reset manually
by means of a 'RESET' push button provided on the front of the relay. A 'Trip Test' push button
is also provided in the relay to enable testing of the trip and alarm circuits. When this push
button is pressed, the output element of the relay is energized and its contacts close to energize
the trip and alarm circuits.
Ratings
Settings
Over Load Ratings
Burden
Accuracy
Current rating (In) :
1A/5A
Auxiliary supply :
1) 20 to 60V DC
2) 75V to 150V AC/DC
3) 175 to 300V DC & 185 to 250V AC
2) 75V to 150V AC/DC
3) 175 to 300V DC & 185 to 250V AC
Setting range (for Stage 1 and 2) :
2.5% to 80% of rated current in steps of 2.5%.
Instantaneous :
Less than 40 milliseconds.
Definite time (for Stage 1 and 2) :
0 to 25 sec adjustable in steps of 0.1 second.
Rejection ratio of 3rd harmonic to :
25 : 1.The relay will not operate at third harmonic
fundamental frequency :
currents up to 25 times the settng.
AC current input :
2 times of rated continuously
20 times Rated for 3 secs.
20 times Rated for 3 secs.
AC current input :
0.65VA at Rated 5A
0.2VA at Rated 1A
0.2VA at Rated 1A
Auxiliary supply :
Less than 6W
Operating value :
± 5%
Drop-off / pick-up :
Between 80% to 95%
Operating time :
±5% or ±30ms whichever is higher
Contact Ratings
Contact Durability
Insulation
Standard Compliance
Relay rating :
10A at 24V DC/230V AC
Contacts configuration :
2 C/O contacts
Loaded contacts:
10,000 Operations
Unloaded contact :
1,00,000 Operations
- 2KV RMS, 50 Hz for 1 minute/ 2.5KV FOR 1 sec.
Between all terminals and cases - 1KV RMS, 50 Hz for 1 minute across open terminals
Weight :
750 gms. (approx)
Case Size :
144 sq mm, depth of 117 mm
Installation :
Flush mounting
Panel cutout :
138 X 138 sq mm
Accuracy test :
IEC 60255-3
Insulation test :
IEC 60255-5
