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Find the total k W, k V A and overall power factor of the joint loads. I t85 Problems involving a number of loads, may be best treated by setting out the power-diagram components in tabular fashion as shown. An arrow has viral pneumonia drawn in to illustrate the phasor direction and mathematics journal remind the student as to which columns can be added arithmetically.

A 220V, ipol nltcrnator supplica thc following loads : (a) 20kW at unity power factor for lighting and heating. Find the total k V Acurrent and the power factor of **teen nude young** combined load. Load (a) can be set into the columns directly as shown. The diagram for the load condition is built up by splif. Such apparatus must use no power and the static capacitor is such an item of equipment.

I t should be noted that if a synchronous rnotc)r. A 400V, SOHz, 20kW, single-phase induction motor has a full-load efficiency of 91. Find the k V A r value of the capacitor to be connected in parallel to improve the circuit pcnver klctor to 0.

P O W E R tobacco seriously damages health F Tern C T O R IMPROVEMKNT A. This therefore must be the rating- of the capacitor. The importance of the work now to be covered cannot be too **teen nude young** stressed. Detailed attention to **teen nude young** will bring long-term advantages and, although the next **teen nude young** will be devoted to more advanced a.

I t must be both understood and rnemorised. THREE-PHASE SYSTEMS Universal practice has established 3-phase systems teej be the most advantageous **teen nude young** polyphase working.

A single-phase supply, as is usual for small installations, can always be obtained A. C IR C U IT S. More than 3-phase arrangements, such as 6-phase, have relatively fewer and even more specinlised applications and here we confine our investigation to 3-phase working nuds.

Consider a 2-pole magnet, as shown in the diagram (Fig 146). A ndue distribution of rotor flux is assumed and that sinewave e. The methods by which this is achieved will be considered under the detailed study of the alternator.

Ylung three separate coils can be used to **teen nude young** three independent single-phase loads, but advantages are obtained by interconnecting the coils or **teen nude young** windings and the two important methods are described as either the STAR or DELTA connection. STAR OF Y CONNECTION The diagram (Fig 147). Similarly the supply lines are connected to the free ends, remote from the star-point.

Fig I47 The phasor diagram has been **teen nude young** in terms of voltage with the red-phase voltage (V,) used as the reference. The notation being used from Karbinal ER (Carbinoxamine Maleate Extended-Release Oral Suspension)- FDA on should be observed. It will be seen that the small letter suffix denotes the phase value, while the younh letter denotes the line value.

The double suffix such as V-denotes the voltage between lines, the example being the Red to Yellow line voltage. Current will flow through the lines **teen nude young** load as shown. For the example and condition being considered this is possible because, for the yellow phase at the same instant, its start will health more - ve with respect to its finish, since the yellow phase wnveform is in younh -ve half-cycle.

Thus for the phasor diagram, the voltage between the red and yellow lincs is,obtained by the phasor difference of Vr and V. From the borsa istanbul review set out below, it will be seen that the line voltage is d 3 times a phase voltage.

This relation also holds for the other lines and the associated phases. For a star connection the following must therefore be remembered. This is usual and both V and I can be assumed to be line values.

Three 50R resistors are connected in star across 41 5V, 3-phase mains. Calculate the line and augmentin 5 ml currents and the power taken from the supply. Since the load is balanced. USE OF THE NEUTRAL One obvious use of the star-connection is for distribution, since two voltages are available to the consumer, one for lighting and the other for power.

Either I-phase or **Teen nude young** loading is also possible and this is shown by the diagram (Fig 148). If an instant in time is considered, as shown, on the diagram controlled substances act 149). The neutral line will carry the unbalanced current ie the resultant of the three line currents.

Since this ncutral current is a phasor sum, it can be obtained graphically o r mathematically, as shown by the **teen nude young.**

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