Answer / narendra katakkar

100X.8=80KW
80KWX5=400A
400/3=133A per Phase
So for 133Amps 150mm2 cable is required

How are load losses and no-load losses measured at site in a DG set?

0 Answers  

---

What is the cause for a blown fuse in one phase of primery side(HV) of a three phase transformer( 4169v-460v) in the time of closing its supply breaker. There is no load on the secondery side of the transformer in this moment.

3 Answers   Novachem,

---

what is demagnetising effect & crossmagnetising effect and how it is related to electrical system?is there any more effects are available or only these two??

1 Answers   Telco,

---

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 are the main applications of transistor in non-linear region?

0 Answers  

---

---

There is two transformers of 2MVA & 3MVA, which transformer is located at the sending end & which is at receiving end. why?

3 Answers  

---

Hi friends, i m electrical engineer i want a cdr for migration purpose so anybody have information about this then send me on jayesh_ee88@yahoo.com.please try to me

0 Answers  

---

there is a power transformer 66/11kV in delta-delta connection has 5 feeder coming out from the secondary side. One of the feeder in it normally loaded (loaded than other feeder)and this feeder usually trips with double OCR causing the bank transformer to trip. Now if the load of this feeder is put on other transformer then that no problems occurs on that transformer or the load. However normally all the test(IR, PI, short ckt, open ckt,grounding test and other ) has been conducted for this but evertything transformer..... I am not geting what is the actual problem...

2 Answers  

---

how is the incoming cable size calculated for a given current rating of a panel??

0 Answers  

---

what are the main parts of UPS what is the function of that?

23 Answers   Apollo, HCL, Liebert, Royal Furnishers, Tech Mahindra,

---

What is mean by retrofitting of machine tool please brief.

1 Answers  

---

what is the working principle of contactor and conditions of normal open and normal close on it?

3 Answers   EEE,

---