Answer / rajkumar

Well a PT uses windings to drop voltage step down transformer high voltage to lower voltage just a transformer only !!! next CVT uses two capacitors in series to drop voltage or split ac like a filter circuit its a tuned 60 cycle resonant cap & coil circuit on primary side . and like a voltage divider circuit but uses capacitors . combined for protection relaying work fault trip zone portection function circuit its also for phase shift ,there really a coupling capacitor voltage splitter circuit centered tap to a reactor coil on primary side input of trans CCVT which is dropped to around 6kv pri input , the center tap of these series caps feed coil and coil feeds trans pri one cap is connected to ground one cap gos to hv line. But multi caps are used in series for the incoming hv line 165kv transmission line , not just two caps by example to make it simple and theres a iron choke coil called a reactor coil it cancels out the caps at 60 cycles for phase shift on output from primary to secondary of CVT transformer theres also a supression circuit on CVT secondary side thats what electricians call it but its just a old snubber circuit for discharge of a potential high voltage spike or back feed kick protection when a major fault occurs on hv transmision line voltage drops off sharply. But the whole circuit works in a delay of false tripping by capacitance stored energy in the caps to hold voltage on primary this controls the tripping time in seconds before a trip of deff relay coils circuits on secondary side which is 115 volts to supply differ relay coils as stated and to control all this with total CVT package circuit and must be included in explaining the difference of both PT and CVT

Answer / hsenid

well ct is current transformerit is connecter series to the line used to measurs the current and pt is potential transformer it is used to measure the voltage between two point and it is connected parallel to the line

what is units of resistance

3 Answers  

---

what is the highest transmission voltage in india???

49 Answers   Bhel, EIPL, Engineering, Jindal,

---

what is the isolation transformer. what is the isolator?

0 Answers  

---

what is the difference between VARIAC,AUTO TRANSFORMER,DIMMERSTAT.

10 Answers  

---

Dear sir, we are getting voltage fluctuations suddenly for 2 or 3 minutes again it becomes normal. we checked each and every connection some times we are getting 110 volts like that from earth to neutral again it is reducing we are getting supply from 45 kva DG set give earthing properly.

3 Answers   Triveni,

---

what is the formula of knowing the clabe size on any load?

1 Answers   JSW, Scan Steel,

---

What happened when a three phase induction motor work on two phase supply.9

6 Answers  

---

Q.1:What protection will be used on HT and LT side of 33/0.4 KV, MVA transformer. Indicate capacities of protective device to be used. Q.2:Which types of back-up protections are used in the power transformers? What do you understand by the term over travel in the relay? Q.3:How star and delta connected winding transformer are provided from earth fault

0 Answers   MPSEB,

---

plz send me the placement interview question and answers of whizchip(technical and apttitude)..i have an interview in next.

0 Answers  

---

diesel generator not getting start so whats problems will happen to DG and how we can start DG

1 Answers   Lodha,

---

what is meant by PU value ? anyone can you explain briefly to me ?

3 Answers  

---

how can i improve the power factor in domestic (230v)

0 Answers   Epcos,

---