Answer / rahul faye

A variable-frequency drive (VVVFD) is a system for controlling the rotational speed of an alternating current (AC) electric motor by controlling the frequency of the electrical power supplied to the motor. A variable frequency drive is a specific type of adjustable-speed drive. Variable-frequency drives are also known as adjustable-frequency drives (AFD), variable-speed drives (VSD), AC drives or inverter drives

Answer / saravananp

In Electrical:- VFD(Variable Frequency Drive). This is used to monitoring and controlling the speed of the driven based on the variation of frequency.

In Mechanical:- This is used to control the flow of air within the duct in terms of CFM(Cubic foot Metre).

ho w to make Incident and accident reporting

1 Answers  

---

Why is it prefer to initiate circuit breaker failure by "86" lockout relay not by "94" tripping relay ?!

0 Answers   OEG,

---

IN OLTC we observed "OUT OF STEP" Alarm, we have two different transformer, when both are in parallel this type of alarm observed. what's the meaning of this alarm and why it occurs???

3 Answers  

---

describe the Operation of induction generators from bus bars

0 Answers   AMIE,

---

What is difference between Harmonic and Non harmonic Capacitor Bank?

0 Answers   TATA,

---

---

Is there chopping current in resistive circuit

0 Answers  

---

why need to be maintain power factor for industrial customer?

2 Answers  

---

What are the different protection systems takes place on control panel board?

7 Answers   BSNL,

---

Is there any Flood lighting system which produces more light (More power consumption 1000W,400W etc.,), white light and restart immediately after power restoration ?

1 Answers  

---

how winding temperature detects in power transformer...?

5 Answers   Roverco,

---

what is the solution for meger test failed the MV cable?

1 Answers  

---

what is earth resistance? how to measured? and give values at power station and mcc area?

0 Answers   Essar,

---