By V Cook
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Extra info for Analysis of Distance Protection
They are widely used in high frequency transformers, in isolation transformers for driving and triggering switching components, in filter inductors for rectifiers, power factor correction and EMI control, and in resonance inductors for soft switching, as well as current transformers. Soft magnetic materials are classified as: Ferrites Laminated iron alloys Powder iron Amorphous alloys Nanocrystalline materials. The main features of each material may be summarized as follows: Ferrites In power electronic devices, ferrites are the most commonly applied magnetic materials.
This form of the magnetic circuit equation is analogous to the Ohm’s law for electrical circuits. The mmf F is related to the reluctance R by: F ¼ fR c ð2:7Þ and the reluctance is defined as: Rc ¼ lc m r m 0 Ac ð2:8Þ Reluctance is a measure of the effect of the magnetic circuit in impeding the flow of the magnetic field; its units are At/Wb. The inverse of reluctance is permeance. There is an analogy here between reluctance in a magnetic circuit and resistance in an electrical circuit. 8. However, it is important to note that while resistance represents power dissipation in an electric circuit, reluctance is closer to electrical impedance, in the sense that it does not involve power loss.
In practice, there is negligible error in taking A and R as the mean radii of the respective coils. 49. 14 GMD between coils of equal area. 2235 (h þ w). 14, the GMD between the coils may be obtained using the formula for the GMD of a coil from itself. We want to calculate the GMD between areas 1 and 3, each having an area A ¼ w Â h. 3, has an area B ¼ w Â c. Rs is the GMD of the total area (1 þ 2 þ 3) from itself. 15 Lyle’s method of equivalent filaments. GMD of the combined area 1 and 2 from itself.