Electric Open Circuit

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Electric Open Circuit

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Voltmeters and Ammeters The short circuit and open circuit are special cases of ideal sources. A short circuit is an ideal voltage source having v(t) 1⁄4 0. The current in a short circuit is determined by the rest of the circuit. An open circuit is an ideal current source having i(t) 1⁄4 0. The voltage across an open circuit is determined bytherestofthe circuit. Figure 2.53 shows thesymbols used to represent theshortcircuitand theopen circuit. Notice that the power absorbed by each of these (5.53) 5.4.5 Measurement of Transformer Losses In order to determine the values of the components of the equivalent circuit of the transformer, it is necessary to carry out two tests. 5.45.1 The OpenCircuit Test The fullrated voltage is applied

to.the primary with the secondary on open circuit. The real and reactive power supplied to the transformer are measured. From Figure 5.10 it is clear that when the secondary is on opencircuit I, is zero and therefore no current flows in the series Replacing the respective combinations redraw the circuit as shown in the Fig. 1.32 (b). Now 3.2 and 4.277 are in parallel. 3.2x4.277 Replacing them by 1.8304 £1 3.2+4.277 RAB = 1+ 18304 = 2.8304 £2 1.11 Short and Open Circuits In the network simplification, short circuit or open circuit existing in the nework plays an important role. 1.11.1 Short Circuit Thick conducting wire When any two points in a network are joined directly to each other with a thick metalic conducting wire,

the PROBLEM.960 Use Thevenin's theorem to calculate the phasor V . in the circuit in Fig. 1. a v.io/o'v/O Fig. 1 Fig. 2 Solution; The plan is to remove the 5fl resistance between a and b and proceed to solve for the opencircuit voltage between these two points. This is the voltage source in our equivalent circuit. Next, connect points a and b together (a short circuit) and calculate the current in the short circuit. Dividing the opencircuit voltage by the shortcircuit current will give us the Main Menu It holds a list of eight subsections that link to the sections of the experiment. The main menu is a while loop that has an output to the screen with a text dialog and a termination button. Parts 1 to 8: Measuring Stator

Resistance.OpenCircuit Test ShortCircuit Test Synchronous Impedance Synchronization Zero Power Factor Test Slip Test Power and Phasor Analysis The theory and the procedure link and the major experimental and analysis modules are included. the voltage The ideal model will undoubtedly fail for a practical voltage source that is shorted or for a practical current source that is opencircuited. The shortcircuit current in a DC voltage source is limited by its internal resistance while that of a timevarying voltage source is limited by internal resistance and internal inductance. Similarly, the opencircuit voltage that appears across a practical current source is limited by its internal resistance in the case of a DC source. It is limited

by.internal If Ra is neglected, it then follows that Ef = V, +jlaXs (8.22) It is immediately seen from Eq. (8.22) that for a given field current under shortcircuit condition (Ia = Isc, rt=o), Ef X,= T (823) he But Ef = V0c (opencircuit voltage, i.e. Ia0 with the same field current). Then with the linearity assumption Voc X = <sc (8.24) If = const where Voc = open circuit voltage and ISc ~ shortcircuit current on a per phase basis with the same field current. Since the magnetization characteristic of the machine is —O Active Passive Z — Z. NetWork Network in —O Figure 5.9: Step II: Find input impedance of the passive network. Step III: Once the opencircuit voltage and the input impedance are known, finding the current

through.the branch with equation (5.14) is simple. The justification behind using this equation is Thevenin's theorem itself. EXAMPLE 5.1 As an example of using Thevenin's theorem in the analysis of electric circuits, we consider a “bridge” circuit, pictured on the left in Figure Howard (Closed Circuit_)B MASS.Bolton Boston Electric Co.. 29 Harrison Av. (Closed Circuit; Open Circuit) . . . . . . . . . .B Clark & Mills, 543 Boyles~ ton (Circuit; Storage). . .D Dow Portable Electric Co., 218 Tremont (Dry; Medical) . . . . . . . . . . . . . . . . . . .D Electric Gas Lighting Co.. 195 Devonshire (Electric: Closed Circuit; Dry) . . . .B Electric Storage Supply C0., 185 Franklin (Closed Circuits) . . . . . . . . . . Swett

&.Lewis Co., 18 Boyleston (Ga1vanic; Medicallè MASS.Brookline HoltzerCabot Like the faults in any electrical device, they are due to short circuits, open circuits or grounds in some part of the electrical system. If one of the electrical circuits rings on to the frame of the lamp when tested with a magneto, that does not necessarily indicate a fault, for some lamp frames are intentionally grounded. Supposing the inoperative lamp to be one of the closed circuit type, shut off the current and see if the ends of the carbon are together and will lift apart freely. It sometimes 

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