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The low voltage side of the instrument transformer, with dot and X1 marking. The X1 and H1 terminals are adjacent. In electrical engineering, dot marking convention, or alphanumeric marking convention, or both, can be used to denote the same relative instantaneous polarity of two mutually inductive components such as between transformer ...
This picture also shows the dot convention. Mutual inductance occurs when the change in current in one inductor induces a voltage in another nearby inductor. It is important as the mechanism by which transformers work, but it can also cause unwanted coupling between conductors in a circuit.
Dot convention works in terms of voltages, independent of which direction the current (and so power) are going on any winding. I suppose it could be done in terms of ampere-turns, also following the dot convention, and for current transformers you would likely do that. That is, the sum of the ampere-turns, following dot convention, is (about) zero.
ECA technology provides the ability to electronically drive an array of coils ( multiple coils) arranged in specific pattern called a topology that generates a sensitivity profile suited to the target defects. Data acquisition is achieved by multiplexing the coils in a special pattern to avoid mutual inductance between the
Pages for logged out editors learn more. Contributions; Talk; Dot convention
k is the coupling coefficient, Le1 and Le2 is the leakage inductance, M1 (M2) is the mutual inductance. An inductively coupled transponder consists of a solid state transceiver chip connected to a large coil that functions as an antenna. When brought within the oscillating magnetic field of a reader unit, the transceiver is powered up by energy ...
The dot product B·dA corresponds to an infinitesimal amount of magnetic flux. In more visual terms, the magnetic flux through the wire loop is proportional to the number of magnetic field lines that pass through the loop.
The Wheatstone bridge has also been generalised to measure impedance in AC circuits, and to measure resistance, inductance, capacitance, and dissipation factor separately. Variants are known as the Wien bridge , Maxwell bridge , and Heaviside bridge (used to measure the effect of mutual inductance). [ 3 ]