Answer / sainul abid

KVAR = MAX DEMAND * (TAN A - TAN B)

Answer / venkatesh

dear mr sainul abid
plz elaborate what is tan A and tanB also discuss the
formule

Answer / gunasekaran

suppose we are using 220KW motor and 0.7 pf we can calculate
the capacitor bank capacity through following formula
p=220KW
s=220/0.7 =314KVA
q=sqrroot(ssqr-psqr)
q=224 KVAR for unity p.f

Answer / teja

CAPACITANCA IN KVAR = MAX.DEMAND * ( TAN A TAN B)

HOW TO SIZE THE TRANSFORMER OR WHAT ARE THE STEPS INVOLVED IN FINDING THE SIZE OF THE TRANSFORMER FOR GIVEN LOAD SAY 2000KW ?

1 Answers  

---

how can we test the vector group of transformer

1 Answers  

---

what is the effect of vector group while phase sequence of a generator changes,whether the vector group changes or not

0 Answers  

---

What is fault level? How can be calculate the fault level?

1 Answers  

---

i have dry type transformers can you help me that how many tests i can do to know the performence of transformer and also please tell me about the BDV test and Insulation resistance test in oil cooled transformers

4 Answers   Hyundai,

---

what is Distance protection & how did it work

2 Answers  

---

how circuit breaker work.. what is the operations taking place inside a circuit breaker when an overcurrent occurs... is it similar to fuse?

0 Answers   LTT,

---

what are the pecularity of shaver sockets ?

0 Answers  

---

what are trouble functions of transformer?ex. prv trip,oltc,oti,wti.explain detail.

1 Answers  

---

If one lamp connects between two phases it will glow or not?

0 Answers  

---

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  

---

what is the difference betn earthed and unearthed cables which is commanly used why?

2 Answers   Bhel, Power Grid,

---