Answer / natha

pf leading or lagging both are undesired.practice generally is to maintain near unity pf which means full utilization of power generated.
If a purely resistive load is connected to a power supply, current and voltage will change polarity in step, the power factor will be unity (1), and the electrical energy flows in a single direction across the network in each cycle. Inductive loads such as transformers and motors (any type of wound coil) consume reactive power with current waveform lagging the voltage. Capacitive loads such as capacitor banks or buried cable generate reactive power with current phase leading the voltage. Both types of loads will absorb energy during part of the AC cycle, which is stored in the device's magnetic or electric field, only to return this energy back to the source during the rest of the cycle.

Answer / devendra verma

No disadvantage

when voltage increases then current also increases then what is the need of over voltage relay and over current relay? can we measure over voltage and over current by measuring current only?

1 Answers  

---

What is the major differences between RCCB & ELCB? If we use ELCB of less sensitivity why does it trip often and can we control it from tripping?

1 Answers  

---

what is diff between Fourier series and Fourier transform?

2 Answers  

---

how capacitor control the power factor/

2 Answers   ABB, Apollo,

---

what is transformer?

2 Answers  

---

What are operating procudures & Safety precautions to be observed while operating OLTC in manual mode ?

0 Answers   NTPC,

---

How can a transformer test by megger?

1 Answers   Bosch,

---

why motor range is available 22kv,30kv,37kv,45kv and so on? why motor range is not available 21kv,24,25,26,27kv and so on?

0 Answers   Government, PSU,

---

When PRV operated at power transformer ,can anybody tell me particular pressure for 50mva transformer plzzz.

1 Answers   BWSSB,

---

what is the form factor of DC voltage

5 Answers  

---

Explain the advantages of the wheatstone bridge method of measuring resistance?

7 Answers  

---

why name plate detail HP/KW rating of a motor is different from measured value HP/KW using formula?

1 Answers   MAHINDRA,

---