Answer Posted / ppc

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Dear Sir/Madam, I have one questions we have three steam turbines and one Gas turbine and our industry linked with the public network, we have protection system one of the protection is reverse power we can export just four MW only i would like to ask about how to calculate the reverse power. Thank you in advance best regards

2082

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determine two methods to find loose connection in operational electrical system?

1675

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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.

2026

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hey guys i scored 910 on GRE and 67 on TOEFL respectively.I have an aggregate of about 74%in my B tech.For which colleges should i apply for an MS program in electrical engineering.I am looking for colleges in NJ,SC,NC,GEORGIA, NY. Please reply with a good response.....

1957

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what is the string efficiency

5231

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Why power factor should not be in leading (capacitive) mode of any load.

6988

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what is a power factor?

1805

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what is the operating time for LBB and how does the LBB relay realise whether cb is opened or not?

1975

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what is the minimum (Common factor) insulatin resistance of the following a, 4mm sq wire b, cable from 50 mm sq to 800mm sq

2095

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How to select the earthing transformer,for DELTA TO DELTA TRANSFORMER OR ALTERNATOR SIDE.Pls post your answers and calculation.

2366

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why current is constant on d.c?

2084

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What is the difference between grid and off- grid system??

1945

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what about SAP/MRP regarding manufacturing of electric motors and all drives?

2014

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how to interlock 3 nos MCCBs using under voltage coil. please provide me circuit diagram?

2602

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I want to design a heating coil of 80/20 nicrome for 3.5KW please give me the calculations choosing for physical dimensions assume coil voltage will be 110V AC assume necessary conditions

1603

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