why we use star connection on the primary side of a transformer?

5 Answers   DRDO, TCE,

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Why in USA supply voltage parameters(230V,60Hz)are different,is there any advantage please brief.

1 Answers   APC, DRJ ARDE,

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What is mean by discrimination of circuit breaker ?

1 Answers  

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what is the function of series reactor

3 Answers   Adhunik, INOX, RMSI,

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we have 3 single phase transformers. how will we generate 6 supply from 3 phase supply input

0 Answers   NHPC,

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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.

0 Answers  

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What type of fittings and electrical accessories can be install in radiation area ?

0 Answers  

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What is C.T, why it is used and what care should be taken for that while connecting?

20 Answers   Bhushan Power Steel,

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Why current shoots up in the secondary on the knee point voltage during saturation test of CT? How core saturation effects the secondary current (while the primary side is open)? What the logic behind this?

0 Answers  

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How to use computer cpu ups use for home inverter circuit board

0 Answers  

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I want to wire sizing calculator which website is available it

1 Answers  

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what is the formula to find Amp. for an 3 phase moter both if H.P. or if kW is known?

5 Answers   Uttam,

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