How you calculating the current for a 2.5 Sqmm cable.
A 30 Hp 3 phase AC motor of power what size of cable is
used for this motor.
- 7 Answers
- 22106 Views
- Siemens, I also Faced
- E-Mail Answers
Answer Posted / shoyabkhan
the answer is wrong we can calculate by usbing this formula
W = 1.732*V * I Cos (phi)
30*746 = 415 * I * 0.8*1.732
I=36.2 AMP
| Is This Answer Correct ? | 24 Yes | 6 No |
Post New Answer View All Answers
what is the need to express current and voltage in rms value? rms value is also called as effective value,what is effective value?
what is v/f control in VFD?
Is there any specialised book to refer about fault level calculation both in MV and LV side??
whether starting current is limited to rated current of motor through soft starting or it exceeds the rated current?
What is the IS standard for MCCB to be use (As per capacity of AMP)& for ACB also.
What are approaches to tackle sedimentation problem of reservoir?
1 Ton is equal to how many watts?
circuit diagram of trip circuit supervision relay
i have been tasked with a design of protection, metering and control(PMC) relay panel extension to accommodate all PMC relays.There is an already existing panel where this one will be built.What are the design aspects for this kind of project? thank you.
please send privious years question papers of jindal steel and power ltd.My e mail id is rajanikant.sngh@gmail.com
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.
Z transform is use when system is not a) converges b) diverges
What is the alternate solution for testing of polarity by using polarity tester while its milli ammeter does not works?
Could you measure voltage in series?
Why is remote backup preferred to local backup?
