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Now it is only 1a.
Ct and pt circuit diagram. These instruments transformers are of two types i current transformers ct and ii potential transformers pt. In some the bar carrying high current may act as a primary. Such specially constructed transformers with accurate turns ratio are called as instrument transformers.
Basic circuit diagram of instrument. Many people want to know what is a current transformer and potential transformer. Difference between current transformer ct potential transformer pt the electrical instruments are not directly connected to the meters or control apparatus of high voltage for safety purpose.
4s wiring diagram 1 ph 3 wire 1 pt 2 ct glems would like to thank and acknowledge the use of the following meter connection diagrams from dr. Advantages of instrument transformer. Previously the secondary current rating of a current transformer was either 1a or 5a.
Ct s or current transformers and pt s or potential transformers are used in metering to step down current and voltage to safer and more manageable levels. Here i will try to demystify the ct pt confusion. One thing that i want to note also is that ct rated meters are not only used as a secondary electric.
The instrument transformers like voltage transformer and current transformer are used for connecting the electrical instruments to the measuring instruments these transformers reduce the voltage and. The original magnitude can be determined by just multiplying the result with the transformation ratio. Be aware that these are general diagrams using standard test switches which may not match some utility standards in their configuration and are for reference only.
Ct construction and circuit symbol. A current transformer ct basically has a primary coil of one or more turns of heavy cross sectional area. This is connected in series with the line carrying high current.
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