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.

When testing an earthing connection, we use a 60 or 100 candle bulb with a phase connected direct from supply and the other wire to the new earthing provided.If the bulb glows then the earth is ok.Else earth connection is not Ok. So, why dont we can use all the home appliances taking a single wire from the phase and the return connection to Earth instead of return connection to neutral?

2 Answers  

Single line diagrams for star to delta and DOL starters.

0 Answers  

Why ferranti effect occurred in leading p.f load?

1 Answers  

What is earth?

0 Answers   CLG,

Why short ckt does not happen when solenoid coil connected to supply. as its a wire only.

1 Answers   Siemens,

WHAT ARE THE BELT HORMONICS IN AC MACHINE HOW TO REDUCE IT

2 Answers   DRDO,

For 7.5kw star delta starter how to calculate 1. Mccb rating 2. Contactor rating 3. Over load relay rating

1 Answers   L&T, MAHINDRA,

how power trnafor from 1 point to another point in bus bar ya transmission line( voltage trnasfer from 1 point to another poin)

0 Answers   Suzlon,

what is first pole to clear factor

1 Answers  

During the testing of Electrical Equipment the test cables should not touch the equipments. For that testing engineers use to cotton rope to hang the cable from measuring Equipment to testing equipment terminal. Please explain the technical reason for this practice.

1 Answers  

what are the checks of diesel gensets

2 Answers   Hathway,

What is the formulae of Megger value for a A.C.Motor

0 Answers