Answer / chicoybolanio

Put the tap position on the nominal taps.
Connect the 4 core cable with MCB on the HV side and the
leads cable at LV side and make sure that
the LV side in open circuit. Then loop together between HV
red phase and LV red phase.
Inject 415V (Switch on the MCB) at HV side and measure the
voltage at LV side for each phase. record results and by
using the test result and following proper scale draw the
vector group of the transformer winding.

Answer / akr

depending upon vector group we shorted winding provde
voltage & check voltage another terminals terminal decided
by vector group

Answer / n.l.narasimham

Short R-r,Y-y,B-b and extend 3 phase supply to HV side.
Measure voltages of different combinations viz.R-y,R-b,
Y-r,Y-b and so on... Then plot the obtained results on a
graph sheet duly taking a convenient scale (eg.100v=5cm)

What are marginally stable systems?

0 Answers  

---

I have connected 04nos. earthings to a transformer through 04nos. earthing pits seperately. 02nos. earthings are connected to T/F body, and 02nos. earthings are connected to T/F neutral.T/F capacity is 2000KVA, 11KV/415V. But after completing of 02 years successful operation ,we are facing following problems- 1. CT/PT occured blast one time 2. HT cable box occured blast two times 3. One body earthing strip and one neutral earthing strip of transformer are overlapping at some places. Whenever these two strips are pressed at overlapped points, they made spark. What is the reason of spark? Please explain the reason & rectification of above problems

5 Answers  

---

why transformer ratings are taken in 11kv 22kv 33kv but not in 10,20,30kv

5 Answers   ushacomm,

---

WHAT DO YOU MEAN THE DIFFERENT TYPE OF CURVES OF RELAY LIKE STANDARD INVERSE, VARY INVERSE, NORMAL INVERSE, LONG INVERSE ETC....

0 Answers  

---

What is electrical earthing?

1 Answers  

---

-How do you select cable size for a given load at a given distance from source of supply. How do you find voltage drop.

0 Answers  

---

What is the power rate of power transformer?

1 Answers  

---

What is the Diesel consumption between 82KVA DG Set and 180KVA DG Set for 1 hour.

1 Answers  

---

wat is meant by PX class in ct?

0 Answers  

---

explain Uninterrupted power supply detailed electronical operation with circuit diagram

1 Answers   Emerson,

---

what type of transformer used in soft ware parks its distribution or power transformer. like 1800 kva

3 Answers  

---

what is humming AC solenoid

2 Answers   Seagate,

---