Current Transformer

[EEVaditya]

Hello,

I am looking for Transformer with following details marked on it:

50~60Hz
660V
300/5A
I am unable to understand other written things as those are not in English Language(Please see the attached image)

[mij59]

From the first picture:

Current transformation ratio 300A to 5A.
Nominal power 5 VA.
Nominal voltage 660V
Accuracy 0.5%

[Gyro]

The 660V figure will be a 'class' rating rather than an electrical parameter - ie. The center hole is physically large enough to accommodate  a 660V rated cable with a capacity of at least 300A.

Edit: The insulation will be rated to take a 660V rms uninsulated conductor (buss bar) through the center too.

[EEVaditya]

can anyone provide me the technical details or datasheet for the exact part because I saw intensely but I am not getting

[MagicSmoker]

can anyone provide me the technical details or datasheet for the exact part because I saw intensely but I am not getting

You are over-thinking this. 50/60Hz current transformers are pretty common so there are lots to choose from. Here is just one example from a reputable online store:

http://www.galco.com/buy/Simpson/37023?source=googleshopping&gclid=CK227ubb58cCFc6PHwod2cILEg&kpid=37023-SPSN

Otherwise, search for the phrase "current transformer 300/5"; where the "300/5" specifies the transformation ratio.

[Stray Electron]

From the first picture:

Current transformation ratio 300A to 5A.
Nominal power 5 VA.
Nominal voltage 660V
Accuracy 0.5%

"Current transformation ratio 300A to 5A."

    Not unless that transformer is going to step the voltage UP by a factor of 300/5!   

  Every current transformer that I've ever seen measures amperage but gives a voltage output.  In this case 5 volts AC out when the current through it is 300 Amps. The output voltage is  directly proportional to the current in the conductor that passes through the center hole. 2 1/2 VAC output for 150 amps, so on and so forth.

   660V is also not the nominal voltage but the MAXIMUM safe voltage.

[nctnico]

Nope. A current transformer does current in to current out. The output voltage depends on a burden resistor.

[Circlotron]

The output voltage is  directly proportional to the current in the conductor that passes through the center hole.

No. The output voltage of a current transformer can go up and up until either the iron saturates or the winding flashes over. CTs are happiest running into a dead short circuit, or in a practical situation, a very low resistance. The output current is directly related to the input current, and seeing the secondary is a current source it will alter it's output voltage to whatever it needs to be to make that exact secondary current flow.

[mij59]

From the first picture:

Current transformation ratio 300A to 5A.
Nominal power 5 VA.
Nominal voltage 660V
Accuracy 0.5%

"Current transformation ratio 300A to 5A."

    Not unless that transformer is going to step the voltage UP by a factor of 300/5!   

  Every current transformer that I've ever seen measures amperage but gives a voltage output.  In this case 5 volts AC out when the current through it is 300 Amps. The output voltage is  directly proportional to the current in the conductor that passes through the center hole. 2 1/2 VAC output for 150 amps, so on and so forth.

   660V is also not the nominal voltage but the MAXIMUM safe voltage.

As the name suggest a current transformer has a fixed current transformation ratio , in this case 300A input gives 5A output.
The maximum voltage the current transformer can provide is 1V, its limited by the power rating, in this case 5VA.
A current transformer can never be configured as a voltage output, not connecting a load to output of the transformer will generate a very high output voltage causing breakdown of the  wire isolation.

[Circlotron]

The maximum voltage the current transformer can provide is 1V,

While maintaining a given linearity.
As you say, it can go  into an open circuit.