1.what is the contact resistace of CB ?
2.radioactivity should be mesured with---------?
- 3 Answers
- 5783 Views
- Power Grid, I also Faced
- E-Mail Answers
Answer Posted / gunasekaran
at the time of contact resistance B/W fixed and moving
contact it is accept up to 100micro ohm for new breaker for
fairly old one is 200 microohm
| Is This Answer Correct ? | 1 Yes | 3 No |
Post New Answer View All Answers
I want to do a mini project. Now I'm studying in 6th semis tor EEE Engineering.
Fantio of tranformer
1.what is meaning of curve into a mcb. 2.what is basic reason changing of curve
Can anybody just suggest about the scope of Electrical design with ETAP software?Just guide me?
why we use ac supply as 415 volts instead of 415 v why we cant apply 230 v for dc
what is size of 3phase 4wire cable to be used for 11 ton ductable A.C and how to calculate cable size for different load
what is KA rating and how can we choose switchgears on applications
Why it is possible to use PWM with a STATCOM and not with a conventional TCR based SVC
How convergengr of nr method is not dependent on selection of slack bus and how gauss siedel method depends?
what are the difference between PLC and embedded
The height to which the liquid in a tank to be maintained for a certain constant velocity?
What is the name of the winding from which the supply is taken for load connections?
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.
difference between ac series and parallel circuit
in star-delta tranformer,if the input of star connection is 400/7v 3 kva then what is the output of delta connection?
