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How Ct and Pt Are Connected?

Sarah Jenkins • • 6 min read
How Ct and Pt Are Connected?
CT is used for current measurement and PT is used for voltage measurement. While a PT has large number of turns on primary and fewer turns in secondary winding. e to get reduced voltage in secondary and V is proportional to Number of turns). And here primary winding is connected across the supply.

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In this way, why is CT connected in series?

The current transformer is designed to connect in series with the line to transform the line current to the standard 1/5 amperes suitable for the meter or relay,Current Transformers are used to measure large current which is flowing through a conductor.

Additionally, why CT and PT are used in substation? In substations the value of currents and voltages is very high, practically it is not possible to measure such high values directly. So CT and PT is used to step down the value of current and voltage respectively. This proportionate low value of current and voltage can be measure with the help of ammeter and voltmeter.

Consequently, why CT secondary is star connected?

In potential transformer the primary and secondary windings are star connected, because in star configuration, the line voltage is root 3 times of phase voltage, hence the voltage distribution to each winding is reduced or divided by 1.732 times.

Why are transformers rated in KVA?

The transformer does not alter the power factor of its output power. Transformers are rated in kVA because the losses occurring in the transformers are independent of power factor. KVA is the unit of apparent power.

Related Question Answers

How is CT ratio calculated?

The CT ratio is measured by shorting the secondary (the 5 A winding) and then injecting a know current into the primary side. Then measure both primary and secondary currents and use them to calculate the ratio.

Why CT is shorted?

secondary winding is shorted so that complete current can flow through it and purpose of current transformer to measure the current in system can be fulfilled. It is very important that the secondary of Current Transformer should not be kept open.
Sarah Jenkins
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Sarah Jenkins

Sarah Jenkins is a veteran tech journalist with over 12 years of experience covering artificial intelligence, mobile innovations, and digital ethics. Her insights have appeared in leading technology publications worldwide.