Answer Posted / krr
neutral is used for safety......when there is a earth fault
occurs by connecting the device in neutral we can sense the
fault. Also to avoid multiple ground faults.To avoid arcing
ground in which if there is a fault between phase to earth
arc is produced due to which current flowing to ground is
very low, overcurrent can not operate on this small current
hence connecting the device in the neutral we can avoind
the high arcing grounds.For core balancing also neutral is
used.
| Is This Answer Correct ? | 8 Yes | 6 No |
Post New Answer View All Answers
What is the size of a 60 watt and 80 watt tubelight?
1. What is differential relay? How it operates? 2.How to calculate the Short Circuit Impedance in Transformer? 3.What is the alternate solution for testing of polarity by using polarity tester while its milli ammeter does not works? 4. While testing the 33KV Busbar by using Hipot kit, what should be the test voltage we have to apply? 5. What is the procedure/activities to be taken to inject the current more than 2000A by using 2000A Loading Transformer? 6. Explain how you can give the overload setting to any Motor Protection Relay for a HT motors with formula and example? 7. Why restricted earth fault protection is needed? Why can’t differential Protection is sufficient? 8. What should be the minimum and maximum ohmic value for earthing? 9. Why DC Currents are not used in transformer? 10. What is the Frequency while we step up the voltage from 220V to 11KV? Is it possible? Explain it?
a)In a 3-phase 4-wire circuit, a circuit breaker is selected to protect the circuit whose highest fault level is 6.6 MVA. Determine the required minimum breaking capacity in kA. (Note: Covert 3-phase power in terms of kA to find answer.) b)Using the below, determine the required minimum making capacity in kA as a “peak value”. Rate breaking capacity (Icn) ka: Icn<= 1.5 Factor = 1.41 1.5
what is the effect of earth on capacitance in 3-phase and 1- phase transmission line?
static chagre
Please brief working principle & construction of permanent magnet AC Servo motor
Explain the different methods used in the choice of rotor slots for reduction of harmonic torques in an induction motor.
The power supplied to a 33microF capacitor from a 120V, 60Hz source will be
which fault is severe and why?between lll fault and lllg fault which fault is severe and y?
Battery is a voltage source? give one example of current source and why?
IN 1000kva transformer where the oil and winding temperature sensors is connected
Can u explain : what is supply for train (whether a,c or d.c ).I know that supply is 25000v a.c .But there is rumour that supply is D.C. And also explain how lights and fans inside the trains are working ,and what type of motors are used in trains whether D.C motors or induction motors .If d.c motor, how it gets supply.If traction motors are used then what are traction motors and its functions and how it differs from other motors and also explain about locomotive . y d.c series motor in train.train wheels r driven by D.C shunt motor ,at what voltage,and at what speed. please reply..............
Any Electrical Engineering jobs?Please refer for interviews. Thank you
what is submersible pump?what is different between motor and sub motor?
WHAT IS SHORT CIRCUIT STRENGTH OF 100 AMPS MCCB?