Answer / haider imam

vvvf is genaraly use in ac drive because only change
frequancy in ac drive in dc drive there is no any
ferequancy so how regulate this.

Answer / j.kesavan

A THYRISITOR DRIVE ,ITS VARING THE VOLTAGE AND FREEQUANCY
IN AC, DC DRIVES.

Answer / ismail

VVVF MEANS VARIBLE VOLTAGE AND VERIBLE FRIQUENCY IT TAKE DC
VOLTAGE TO RUN DAT VOLTAGE IS MAY BE 24V DC CORRENT ONLY
DEPENDING UPON THE APPLICATION IT IS BASED

difference b/w current and voltage relay?

1 Answers  

---

While performing load test on DC SERIES MOTOR, does the voltage decrease slightly. Why?

2 Answers  

---

Does the total power means fundamental plus Harmonics?

2 Answers  

---

WHAT IS THE MINIMUM IR VALUE FOR CABLE CHARGING

4 Answers   Google,

---

What are the types of TESTS in CIRCUIT BREAKERS based on Testing and commissioning?

2 Answers  

---

---

How many methods to take IR value of Current Transformer?

1 Answers  

---

Cables Construction hi friends, 0.6/1/1.2 kV LV , DC and Control cables are concentric copper conductor what does its means and what is the use of concentric copper conductor,and are this with copper tape shield or copper screening, ? thanks

0 Answers  

---

What is principle of Floroscent tube 36watt.

0 Answers   Diamiller, NDPL, Trident Hilton,

---

Why does the power consumed is always constant even if a fan speed is altered?

5 Answers  

---

can anyone please help me to find the rupturing or breaking capacity in KA of circuit breaker (MCCB,VCB,ACB etc) of HT and LT side of a distribution transformer...please help with detailed step by step answer...thank you

0 Answers  

---

Stepwise process of Northern grid failure in 2012!? (dont copy paste from wikipedia)

1 Answers   Rashtriya Ispat Nigam Limited RINL,

---

why generation is done in delta nad transmission in star? brief

3 Answers  

---