refer to the circuit in (figure 1). assume that there are no external connections to the terminals a, b, c. assume further that the three windings are from a three-phase generator whose voltages are va

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09-12-2022
Engineering

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refer to the circuit in (figure 1). assume that there are no external connections to the terminals a, b, c. assume further that the three windings are from a three-phase generator whose voltages are va

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tutorconsortium110 tutorconsortium110 · Answer 1 · 2022-12-16T07:37:50+01:00

In order to produce an alternating current in its secondary winding that is proportional to the current being measured in its primary, the Current Transformer (C.T.), a sort of "instrument transformer," must first produce an alternating current in its primary winding.

What is Current Transformer?

With the help of a conventional ammeter, current transformers make it simple to securely measure the real electrical current flowing through an AC transmission line. High voltage currents are reduced to significantly lower values. An ordinary voltage transformer operates on a principal that is slightly different from that of a fundamental current transformer.
Given this configuration, the current transformer is frequently referred to as a "series transformer" because the primary winding, which never has more than a handful of turns, is connected in series with the current-carrying cable supplying a load.
As long as the voltage induced in the secondary is not high enough to saturate the core or cause failure due to severe voltage breakdown, the secondary winding will feed current into either a short circuit, such as an ammeter, or a resistive load.
The main current of a current transformer, in contrast to a voltage transformer, is not governed by the secondary load current but rather by an external load. When the primary current rating is higher, the secondary current is typically rated at 5 Amperes instead of the customary 1 Ampere.

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