Answer / yasser

Corona Inception

Corona inception voltage is the lowest voltage at which
continuous corona of specified
pulse amplitude occurs as the applied voltage is gradually
increased. Corona inception
voltage decreases as the frequency of the applied voltage
increases.
Corona can occur in applications as low as 300V.

Corona Extinction

Corona extinction voltage is the highest voltage at which
continuous corona of specified
pulse amplitude no longer occurs as the applied voltage is
gradually decreased from above
the corona inception value. Thus, once corona starts, the
voltage must be decreased to get
it to stop.

CFVV - constant flux voltage variation

The short notation of tapping range and tapping steps
indicates the variation range of the
ratio of the transformer. But the assigned values of tapping
quantities are not fully defined by
this alone. Additional information is necessary. This can be
given either in tabular form with
tapping power, tapping voltage and tapping current for each
tapping, or as text, indicating
'category of voltage variation' and possible limitations of
the range within which the tappings
are 'full-power tappings'.
Thus CFVV is defined as the tapping voltage in any untapped
winding is constant from tapping to tapping. The tapping
voltages in the tapped winding are proportional to the
tapping factors.

HOW MUCH CURRENT DOES SYNCHRONOUS MOTOR TAKES AT SYNCHRONOUS SPEED IN NO LOAD CONDITION ?

0 Answers  

---

WHY SECONDARY OF CT SHOULD NEVER BE KEPT OPEN CIRCUITED?

7 Answers  

---

AIR GAP IS TERMED AS USEFUL. WHY?

5 Answers  

---

how to calculate a cable size while load is given in amp or kw and length is also define.?

1 Answers  

---

Why 30°phase shift occur in star-delta transformer between primary and secondary?

1 Answers  

---

What happens to a motor if it is connected in Delta connection

0 Answers  

---

WHTA IS LIMT OF LEAKGE CURRENT OF 11 KV 1 CORE 1000SQ.MM. XLPE CABLE.LOAD ON CABLE IS AROUND 600AMP .LENGTH 500 MTRS.

0 Answers   L&T,

---

types of central Air conditioner plant?

0 Answers  

---

why is a earth pit 10 ft usually? And, what should be the distance betweeen two earth pit?

4 Answers  

---

explain different types of d.c motors?

0 Answers  

---

Write down the brushes of a de machine.

0 Answers  

---

Explain the purpose of inductor in an electric circuit?

0 Answers  

---