Single Stage, Neutral Unbalance Current Relay
₹10,367.50
Product Code: JRC 122
Time line :Products will be shipped within 3 weeks from the date of order
Stock In Stock
Viewed 5050 times
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 the fundamental frequency. The output of filter is fed to a 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
Aux. Supply :
20 – 60V DC
75 - 150V AC /DC
175 – 300V DC or 185 – 250V AC
75 - 150V AC /DC
175 – 300V DC or 185 – 250V AC
Setting range :
2.5% to 80% of rated current
in steps of 2.5%.
Instantaneous :
Less than 40 milliseconds.
Definite time :
0 to 25 seconds 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 settings
AC current input :
2 times Rated continuous
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
Aux. Supply :
Less than 6W
Operating value :
±5%
Drop-off I 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 contact :
10,000 operations min.
Unloaded contact :
100,000 operations min.
- 2KV RMS, 50 Hz for 1 minute / 2.5 KV for 1 sec
Between all terminals and earth. - 1 KV RMS, 50 Hz for 1 minute across open contact
Weight :
750 gms. (approx)
Case Size :
144sq mm, depth 117mm
Installation :
Flush mounting
Panel cutout :
138mm x 138mm
Accuracy Test :
IEC 60255-3
Insulation Test :
IEC 60255-5
TERMINAL DIAGRAM
