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What is Dot convention in coupled circuits?
Dot convention is a technique, which gives the details about voltage polarity at the dotted terminal. If the current enters at the dotted terminal of one coil (or inductor), then it induces a voltage at another coil (or inductor), which is having positive polarity at the dotted terminal.
What is the importance of dot convention?
The convention is that current entering a transformer at the end of a winding marked with a dot, will tend to produce current exiting other windings at their dotted ends. Maintaining proper polarity is important in power system protection, measurement and control systems.
What is circuit coupling?
Coupling is also the transfer of electrical energy from one circuit segment to another. For example, energy is transferred from a power source to an electrical load by means of conductive coupling, which may be either resistive or hard-wire.
Why do you use the dot convention in KVL?
Dot convention is a technique, which gives the details about voltage polarity at the dotted terminal. This information is useful, while writing KVL equations. If the current enters at the dotted terminal of one coil (or inductor), then it induces a voltage at another coil (or inductor), which is having positive polarity at the dotted terminal.
How is the current induced in a coupled circuit?
If the current leaves from the dotted terminal of one coil (or inductor), then it induces a voltage at another coil (or inductor), which is having negative polarity at the dotted terminal. We can classify coupling into the following two categories.
What happens when a dot is placed on a coil?
Once the dot is placed on one coil, dots on the terminals of other remaining coils cannot be placed arbitrarily now. Dots on other coils are now automatically decided according to the sense of the winding.
When does magnetic coupling occur in a circuit?
Magnetic coupling occurs, when there is no physical connection between two coils (or inductors). This coupling can be of either aiding type or opposing type. It is based on whether the current enters at the dotted terminal or leaves from the dotted terminal. Consider the following electrical equivalent circuit of transformer.