HOW to speed control of induction mototr using scalar control

3 Answers  

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how to calculate energy of 3-phase motor?

0 Answers   Suzlon,

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What is the comparison of PILC and XLPE cable

0 Answers  

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What is diode fuse ? How it is working?

1 Answers   Hyundai, LG,

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what is the difference between LPF and UPF wattmeter and where it is used.

7 Answers  

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which one is rotating transformer-single phase induction motor or 3 phase squirrel cage motor?

1 Answers  

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what is the difference between neutral and earth????

4 Answers  

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how i can calculate the size for fire cable

0 Answers   Adani Power,

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what is the function of choke in tube

1 Answers  

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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 0for 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.

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what r the types of detectors? state the location these detectors?

3 Answers  

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why use -48 volt DC power in telecom?

3 Answers  

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