NUMERICAL OVERFLUX RELAY
₹44,980.00
Product Code: JNF020
Time line :Products will be shipped within 3 weeks from the date of order
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Product Description
Features
- Programmable V/F ratio
- History of 5 latest relay closing details
Application
JNF 020 Over flux relay is used in power systems in order to protect transformers and generators against insulation failure and core damage due to over heating under prolonged over fluxing condition. It protects the equipment against abnormal V/F ratios due to system disturbance which can occur during starting, load sheding and shut down conditions.
Principle of Operation
Over fluxing of a transformer occurs when its flux density exceeds rated density, it is caused when its V/F ratio is greater than that which the manufacture deems it safe. This of course is the case when it is connected directly to the generator i.e, without benefit of an intervening circuitbreaker and the generators excitation system is energized while accelerating to operating speed JNF 020 monitors voltage & frequency ratio, when it exceeds the set value it indicates fault and the output relay operates after a set alarm time delay.
Ratings
Settings
Overload Rating
Burden
Rated Voltage :
110VAC
Frequency rating :
0 Hz
Auxiliary supply :
1) 20 to 60V DC
2) 75 to 150V AC / DC
3) 175 to 300V DC / 185 to 250V AC
2) 75 to 150V AC / DC
3) 175 to 300V DC / 185 to 250V AC
Alarm settng Alarm Time delay:
1.1 - 1.30 V/Hz. In steps of 0.01
Alarm Time delay :
0.5 - 50.0 secs. In steps of 0.1
Inverse Time Pickup :
1.2 - 1.50 V/Hz. In steps of 0.01
TMS :
001 - 100 In steps of 1
Rated voltage :
5 - 125 V. In steps of IV
Voltage input :
2 times Rated continuous
AC voltage input AUX Supp :
Less than 0.1VA
Less than 4W (Non Operated)
Less than 10W (Operated)
Less than 4W (Non Operated)
Less than 10W (Operated)
Accuracy
Contact Ratings
Contact Durability
Mechanical Design
Standrard Compliance
Voltage :
±5% of reading
Frequency :
±0.02 Hz of reading
Operating time :
±5% of the value
Trip / Alarm :
10A at 24V DC / 230V AC
Loaded contact :
10,000 operations min.
Unloaded contact :
100,000 operations min.
Weight :
3500gms (approx)
Case Size :
152X296 sq mm, depth 250mm
Installation :
Flush mounting
Panel cutout :
146 x 264 mm
Accuracy Test :
IEC 60255-3
Insulation Test :
IEC 60255-5
TERMINAL DIAGRAM
