OUR METER READER TAKE READING OF INDUSTRIAL CONSUMER.THEY ALWAYS ASK HOW TO INCREASE POWER FACTOR FROM 60% TO 99 % TO AVOID PENALTY OF POWER FACTOR.

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A 2083kva AVR was tested, phase to ground shows continuity, what is the implications

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what is meant by moulded case circuit breaker ?

0 Answers   ABB,

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Usually in the L & T make MCC feeders' power circuit,we have BMR after the MAIN CONTACTOR.,can we interchange their position, keeping the control logic same???

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Can we use a absolute encoder to show rpm of a motor ? what about the condition when power is off ? what is difference if a incremental one is used ?abanirout@gmail.com

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what are frequency changers ? Tell me about commertially availble frequency changers ?

1 Answers   GE,

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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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why dc series motors never start without some load, and what will happen if starting with out load..

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which types of relay used in acb and vcb?

0 Answers   IBM,

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why ground clearance of EHV line is more than HV line??

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what is the right cable size for 100 hp mpter.

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how can service sitting be setted for MCCB?Example for sittings IR (CURRENT RATING),IS(CURRENT STARTING)IO (current operating)?

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