Difference between CT and PT, Current Transformer and Potential Transformer
In this article we will know about what is difference between CT and PT . we will also know short description of CT and PT. So these are some difference between PT and CT.
Difference between CT and PT
CT (Current Transformer)
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1. The primary winding current in CT is independent of the secondary winding circuit condition.
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The primary winding current is PT depends on secondary circuit burden.
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2. In case of CT , it is connected in series with one line and a small voltage exist across its terminals, however CT carries the full line current.
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In |PTs full line voltage is impressed upon its terminals.
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3. The primary winding current and excitation of a CT vary over wide limits in normal operation.
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In case of PT , it is under normal operation the line voltage is nearly constant and therefore the flux density and exciting current of a PT varies only over a restricted range .
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4. The CT may be through as a series transformer under virtual short circuit conditions.
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The PT may be considering as parallel transformer with its secondary winding operating under open circuit conditions.
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6. The secondary of a C.T cannot be open during maintenance.
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The secondary of a P.T can be open circuited maintenance or during testing.
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7. In case of CT primary current is independent of the secondary circuit condition.
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In case of PT , its primary current is depend on secondary circuit condition.
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8. It can be consider as a series transformer
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It can be consider as a parallel transformer.
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9. By the help of CT , a 5A ammeter can be measured higher current. As like 400A.
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With the help of PT , A 230 Voltmeter can be measured thousand volt. As like 11KV.
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10. CT is used for current measurement
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PT is used for Voltage measurement
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Hence these are some difference between CT and PT if you will find any incorrect in above article you must comment in comment box.