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L P σ & L S σ are primary & secondary leakage inductances, corresponding to primary & secondary leakage reactances X P σ & X S σ. The transformer can be expressed more conveniently as the equivalent circuit in Fig. 3 with secondary constants referred (i.e., with prime superscript notation) to the primary, [25] [26]
Ideal transformer connected with source V P on primary and load impedance Z L on secondary, where 0 < Z L < ∞. Ideal transformer and induction law [ d ] A varying current in the transformer's primary winding creates a varying magnetic flux in the transformer core, which is also encircled by the secondary winding.
The Scott-T transformer connection may also be used in a back-to-back T-to-T arrangement for a three-phase to three-phase connection. This is a cost-saving in the lower-power transformers due to the two-coil T connected to a secondary two-coil T instead of the traditional three-coil primary to three-coil secondary transformer.
is the corresponding open-circuit measurement of primary or secondary inductance; Other transformer parameters like leakage inductance and mutual inductance which cannot be directly measured may be defined in terms of k. Short-circuit inductance is one of the parameters that determines the resonance frequency of the magnetic phase synchronous ...
A current transformer (CT) is a type of transformer that is used to reduce or multiply an alternating current (AC). It produces a current in its secondary which is proportional to the current in its primary. Current transformers, along with voltage or potential transformers, are instrument transformers.
The changing primary current causes a changing magnetic field ("flux") through the transformer's windings; this changing field induces a (relatively) steady secondary voltage V s = N×V b. In some designs (as shown in the diagrams) the secondary voltage V s adds to the source voltage V b ; in this case because the voltage across the primary ...
A leakage transformer, also called a stray-field transformer, has a significantly higher leakage inductance than other transformers, sometimes increased by a magnetic bypass or shunt in its core between primary and secondary, which is sometimes adjustable with a set screw. This provides a transformer with an inherent current limitation due to ...
A delta-wye transformer is a type of three-phase electric power transformer design that employs delta-connected windings on its primary and wye/star connected windings on its secondary. A neutral wire can be provided on wye output side. It can be a single three-phase transformer, or built from three independent single-phase units.
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