4.7.2 General queries
Article 4.7.2.6S : How many parameters data comes online of iELR in Elnet?
Only the leakage current will be shown in register address 151. Another address 149 is a dummy. 1. Current R Phase 40151 = Leakage current of iELR 2.Current Average 40149 = Dummy
Article 4.7.2.AA : How leakage current values affecting human beings.
The below table indicates the current values affecting human beings Current mA Symptom 1 or less Causes no sensation - not felt 1 to 8 Sensation of shock, not painful, individual can let go at will, as muscular control is not lost 8 to 15 Painful ...
Article 4.7.2P : Principle of operation of CBCT in iELR.
Principle of Operation CBCTs work on Kirchoff's principle that the sum of currents at any point in a circuit is zero. Hence in case a leakage current exists in a circuit, it causes the sum of currents upstream of the leakage point to be non-zero. ...
Article 4.7.2O : Importance of iELR(Earth Leakage Relay) in Power system.
Earth Leakage Relays Earth leakage relays play two very important roles in electrical systems ‒ protection of human beings from electrocution and safety from fire. Leakage current through very small in magnitude can wreak havoc in the installations. ...
Article 4.7.2A Breaker of connected iELR is not Tripping during manual Test.
If Trip indication and command is displayed on the meter after manually tripped. Then Check the changeover of NO & NC of iELR with COM. If that also works then there is a problem in connected Breaker not in iELR. And, If NO & NC changeover not done ...
Article 4.7.2G : Mention the applications of iELR?
Protects control panels and switch boards from flame leakage. Protects motors/ transformers/ feeders/ generators from earth leakage. Hazardous and sensitive like oil refineries / electrical distribution can be protected.
Article 4.7.2H : What are the standard CBCT available in iELR ?
40mm, 65mm, 100mm, 150mm, 200mm, 250mm & 300mm (Round type).
Article 4.7.2I : What are the major unique features of iELR?
Continuous Earth Leakage value display, No dip switch selection, Intelligent tripping based on T proportional to 1/A, No limitations on set current & optional Rs485 output.
Article 4.7.2E : How will you test the ELR manually ?
While pressing UP (Right key) continuously for 5 seconds relay will get enabled.
Article 4.7.2D : How many relay contacts available in ELR?
2 relay contacts. One NO & one NC.
Article 4.7.2M : What is the trip time interval programmable in iELR?
300mS to 30 Seconds Interval.
Article 4.7.2L : What is the current input range for ELR?
30mA-12A.
Article 4.7.2K : What is mean by Intelligent ELR ?
We call it as Intelligent because, Trip time is inversely proportional to leakage current. The leakage current is 10 times higher than the set current, it trips 10 times faster.
Article 4.7.2F : In iELR, which CT is used and also mention the input current ratios.
CBCT is used in iELR. Input current range is 60mA - 12A.
Article 4.7.2J : What are the technical specification of iELR for Input, trip time Input Current and CBCT inner diameter available relay contacts?
Input current range from 60mA to 12A and trip time programmable from 300mS to 30Seconds. Inner diameters: 40mm,65mm,100mm,150mm ,200mm,250mm and 300mm.
Article 4.7.2N : What is the tripping time programmable in iELR?
0.3 to 30 sec.
Article 4.7.2B : How to calculate Accuracy of iELR Meter ?
Accuracy is claimed only for FULL SCALE reading in the IELR Meter- Meaning, Accuracy limits are to be only calculated for 12 Amps - in 300mA to 12A Meter 30 Amps- in 30mA to 30A Meter.(Latest Model) The accuracy class is 2% for all ranges of CBCT & ...
Article 4.7.2A : How to connect iELR ?