Answer Posted / senthilkumar
earthing and grounding almost same. total equipments are earthed and connected to the earthgrid. grounding can done on the transformer neutral. that neutral should be grounded.
| Is This Answer Correct ? | 0 Yes | 1 No |
Post New Answer View All Answers
What is magneto on a gas generator. how it functions. its out put is d.c or a.c. how it can be checked for correct functioning
Between educational qualification and practical work experience, give us a brief explanation on your practical experience in your past Endeavour that you performed well to the satisfaction of your past or present employer?
What is the diff. between single compression and double compression gland
Dear all: Recently we got a question about Interface between PMS and SAP-PM.once we got a update message from PMS.we should set the deletional flag for functional location in SAP system.Is there any FM or BAPI to use?There are only functional location create and change provided by SAP. Best regards!
how to calculate the earth fault current
what is the difference between elcb and rccb ?
What is CCM in Electrical ? where can we use this material?
What safety precaution are to be taken for avoiding electric hazards ?
which types of relay used in acb and vcb?
What are the internal and external faults?
what are the range of memory address in plc for L&T lx7 4A
in single phase converter, the no.of scr's conducting during overlap a)1 b)2 c)3 d)4
For high frequency application we use which transformer?
how to test reverse power trip?
1. A 380 / 220 V r.m.s. 3-phase 4-wire circuit carries loads of 8 + j8.1 ohm; 4 + j4.1 ohm; and 2 +j2.1 ohmin the three phases respectively. The length of the circuit is 100 m, and the resistivity of the phase conductors is 0.0005 Ω/m. The neutral conductor is of the same size as the phase conductors. a) Select a reference angle 0for the first phase. Then write down the three phase voltages in both polar format and complex number format. b) Make appropriate assumptions, and take temperature effects on resistance is insignificant. Calculate the currents in the three phases. (Note: Determine conductor resistance, and apply Kirchhoff’s Voltage Law) Based on the result, suggest a main switch rating for the circuit. c) Show your preferred direction of neutral current in a diagram, and then determine its value. (Note: Apply superposition principle, and Kirchhoff’s Current Law) Use its magnitude to show that in this circuit, the unbalanced load may increase the voltage drop in some of the phases. (Note: Also observe the common volt drip in neutral) State your assumptions, if there are any. d) Suddenly the neutral wire of the circuit is broken. Estimate the new currents in the first phase, i.e. Phase L1. State your assumptions, if there are any.
