Answer / a.ramachandran

current transformer : transformation of high current into
required current rating of measuring instruments and
protection relays.

Potential transformer: step down the high voltage into low
voltage for the purpose of measuring instruments and
protection relays.

Answer / pragati kumar

Current Transformer(ct) is used to measure current in high
voltage ac circuit because it is not possible to measure
high voltage ac current with ammeter alone.Potential
Transformer(pt) is used to measure high ac voltage.

Answer / wasif arshad

Basically both CT and PT steps down the voltage but the difference is that in CT primary is not winded on the core and both the terminals of secondary are connected to ampere meter of appropriate transformation ratio while in pt both primary and secondary are wounded on the core like a simple step down transformer and both terminals of primary are connected to the high voltage and secondary to the voltmeter to give deflection according to scale of voltmeter having the same transformation ratio shown on PT.

Answer / mrudang

ct and pt both we are using for protection

Answer / sanjay kumar

current transformer(ct)works to reduce the current for
measuring equipment or protection relay bcoz ct works as a
step up transformer.
potential transformer(pt)works to the voltage for measuring
equipment or protection relay bcoz pt works as astep down
transformer.

we have two generators different capacity on 15 MW and other 6MW at 11 KV , 15 MW gen. bus short level current 40KA,and 6MW short level current 25KA,, length of cable 100MTR between 6 MW from 15MW gen. for bus coupling . kindly tell any one can we use both NGR OR one NGR from any GEN. BOTH NGR has diff. rating. Tariq pakistan

0 Answers   RYK Mills,

---

This is reqd for a 1MW Solar power plant..We have 2DC outputs from the solar panels Connected to 2INVERTOR panels.. Output from invertor is 3ph,280v,500kva,50hz.These are connected to individual ACB.This has to be stepped up to 11KV ,1250KVA SYSTEM.Now can I use (1) one more ACBTO GIVE A COMBINED OUTPUT OF 1000KVA,280V & STEP UP THE OUTPUT BY USING a single two winding 3 ph transformer 11kv/1250kva. or (2)use the two outputs and connect to one three winding transformer of above rating..Pls suggestwith details.

0 Answers  

---

what is unbalanced rotating magnetic field?

1 Answers  

---

How the capacitance og capacitor volatage transformer is decided?

0 Answers  

---

Explain What will happen when direction of field current is changed (i.e, field excitation is reversed) in the following machines? 1) Alternator 2) Synchronous Motor 3) D.C Generator ( Shunt or Seies ) 4) D.C Motor ( Shunt or Seies )

3 Answers   NTPC, Transco,

---

---

coil is consist of

1 Answers   Enercon,

---

How can we estimate Gen rotor current?

3 Answers  

---

Can I use 1 phase power supply to run 3 phase motor? If yes, how?

6 Answers  

---

and gate circuit diagram,amplifier circuit diagram

0 Answers   NHPC,

---

WHAT IS LINIER MOTOR?

4 Answers   BSNL, wbsedcl,

---

how a synchronous motor is used as a resistor,capacitor and an inductor?

3 Answers   Technocon Services,

---

if 20 hp motor starts directly delta connection.motor what will be the effect.

3 Answers   HP,

---