Answer / sunil guru

corona is the function of partial discharge of air near the surface of the conductor due to high voltage (in kv) and high voltage above rated is possible only due to switching over voltage or lightning over voltage so the corona ring is provided near switch yard lightning arrestor

Answer / hardik bhesaniya

Corona is a effect of Extra High Voltage either due to switching over voltage or sue to lightning over voltage. The role of the corona ring is to distribute the electric field gradient and lower its maximum values below the corona threshold, preventing corona discharge.

Answer / prashant singh

because corona is generated in out side, it meanse through
out the atmospheare, so we use corona ring in out door
switchyard. if we will know abought the corona so we can
give easily of this question.

When a single pase capacitor run motor- run on 230vac and Case(1)run with 8 Mfd 250 vac.capacitor , Case( 2) run with 8 Mfd 400vac capacitor. What is difference between both case regarding power ,efficiency etc?

0 Answers  

---

what is power system.........?

1 Answers  

---

we have a rewind motor of 2Hp,2800Rpm, 220Volt AC. how can we choose the running capacitor for this motor, any formula for that?

0 Answers  

---

WHat is the requirement of installing FAST ACTING EARTH SWITCH in GIS and how is that integrated with protection system. How and when does it operate?

0 Answers  

---

what difference beetwin phase voltage & line voltage and phase current& line current ?

1 Answers  

---

---

what is power and what is watts detailed description and formulas

2 Answers  

---

how many units will 100 kvar capacitor consume for one day?

2 Answers   Philips,

---

power requirement of an l.e.d?

2 Answers  

---

What conditions are required for transformer to operate at low frequencies ?

0 Answers  

---

difference b/w eath and neutral

10 Answers   ABB,

---

if a damaged 500kva transformer with %impedance 2.6 is replaced by two transformers of 250Kva with different % impedance will they be able to catter the load. what will be the ratio of load on the two transformers if the % impedance is in the ratio 1:2

2 Answers   Siemens,

---

is tree is a good conductor and it may be used for conductor?

3 Answers  

---