Asd Electrical Engineer

THE HONG KONG POLYTECHNIC UNIVERSITY DEPARTMENT OF ELECTRICAL ENGINEERING EE2011/2711 Applied electromagnetics Expt. No. 3 Field Plotting Using Conducting Paper Objectives: 1. 2. 3. toilet facility: To obtain the work pattern for a three-phase busbar accord at selected time instants during the cycle. To familiarize with field plotting using conducting traverse and smooth-spoken paint. To obtain electrical parameters from field plots. Field-plotting kit (including sheets of carbon-loaded conducting paper, atomic number 47 paint, connecting wires and sweeping pen) or PASCO Equipotential and Field Mapper; Variable dc power supply; Potential-divider (formed by connecting resistors on a breadboard); digital multimeter. Theory: Equipotentials and Curvilinear Squ ars It is evident that along an equipotential lift in that respect can be no electric field (since E = - dV/dx). It follows that a unify line moldiness sweep an equipotential surface at right angles. Consider a teeny divisor of an electric field as shown in Fig. 1, where a1 and a2 are dickens equipotential surfaces, X1, X2, X3 and X4 are four electric flux lines. x1 x2 dy d? a2 a1 V V + dV Figure 1 X dx x4 x3 dz d? 1 The get flux passing finished a1 is: d? ? D ? dA where D is the electric flux density of area a1.

(1) According to Gausss Law, the surface integral of the electric flux density must equal the meat charge enclosed: Q ? ? ? ? D ? dA (2) mental capacity C ? dQ D ? dzdy D ? dz ? dy dy dy ? ? ? ? 0? r dz ? ? ?dz ? dV dV E ? dx dx dx (3) where ?0 = 8.85 ? 10-12 F/m is the permittivity of free space and ?r is the re! lative permittivity of the dielectric. If we can return equipotentials and flux lines such that they form curving squares (squares with curved sides (see Fig. 2), thusly dy and dx are equal and the capacitance of each curved square (or cell) will be ?dz. In the system shown in Fig. 2, the dielectric may be considered to be made up of a large number of such cells in nonparallel publication and...If you want to get a full essay, tramp it on our website: OrderCustomPaper.com

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