Answer Posted / p.k.ghosh / visakhapatnam

I dont know in which angle you are asking this question
because transformer is not exporting & importing power but
for impoting & exporting power in a power plant we are
using same transformer.
Most of the pick load plants ( e.g. DIESEL PLANTs ) became
ideal or off in normal hours ( not in peak time )and this
time they are purchasing electricity from the electricity
board for plant's inside supply purpose. This time the
transformer in side the substation which attached to the
plant receiving power from out side feeder. The diesel
plant has to pay electricity bill for the receiving energy.
At peak hours diesel plant started to run & when the
voltage, phase, frequency etc. of alternator are
synchronized then throw the load to the out put feeders
through the transformers. Now the diesel plant is exporting
the power to the electricity board through transformer.

how we start 40w tube light with 4 diodes,2capacitors,1 choke and without starter.(a product avilable in market which lights burnt tube lights also)

2100

---

What is the formula to calculate the rating of a three phase miniature circuit breaker

2204

---

hi friends how 3 phase converter functioning ?what is working principle of rotory phase converter ?

2159

---

how to calculate voltage drop and followed by cable calculation?is there avail in formula?

2115

---

What is a commutator?

1111

---

I need HT sphere gap calibration table. Can any body help me.

1991

---

how much flux density of CRNO core

3034

---

A 1F capacitor is charged to 100V initially. A 1H inductor is connected accros the capacitor througha a switch. The current in the circiut when the switch is closed is____

2374

---

the problem faced on star or delta winding connection??

1971

---

how to carry out Magnetizing Current Test on Distribution transformer and what purpose we are doing this test. why transformer rating in always in KVA ? what ispositive, negative, zero sequence impedence? How ElCB tripping if Neutral touch with ground Why AC & DC capacitor are use in UPS ? why motor rating in KW? how to syncronize two dg sets

2248

---

What is difference between YNyn0 and YNyn ??

2637

---

Why you want to join non technical field when you are an engineer?

6813

---

where lt & ht capacitor used

2279

---

What are the different towers used in 132kv transmission line? what are the differences between the P,R,S towers used in 132KV and detailed explanation

1959

---

Scott connection is used for A 3-phase to 2-phase conversion B to achieve higher effciency C to save copper D to reduce harmonics

2357

---