how to use barcode in rdlc report Delta-Y Connection This is generally considered to be the most satisfactory in Software

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76 Delta-Y Connection This is generally considered to be the most satisfactory
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three-phase connection Advantages The neutral can be brought out either for grounding or for loading The neutral is stable, being locked by the delta The connection is practically free from third-harmonic voltages, as third-harmonic magnetizing current circulates
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through the delta winding Differences of magnetizing current, voltage ratio, and impedance in the different units are adjusted by a small magnetizing current circulating in the delta A short circuit in one leg of the Y does not affect the voltages of the secondary lines A single-phase short circuit on the secondary lines causes a smaller short-circuit stress on a delta-Y-setup bank than on a delta-delta bank Figure 1654a can be multipled with Fig 1654b by properly selecting the leads Disadvantages The delta-Y bank cannot operate temporarily with two units when one is disabled A short circuit on or in one unit is extended to all three units If the delta is on the primary side and is accidentally opened, the unexcited leg on the Y side may resonate with the line capacitance and cause damage
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77 Open-Delta or V-V Connection (see Fig 1655) This connection requires only two units and is useful in an emergency; it is used in small control systems Since the internal power factor is 0866 (assuming a unity power-factor load), it can deliver only 0866 of its rated kilovoltampere capacity or 58 percent of the capacity of three units Load voltages become unbalanced under load, even with balanced three-phase load, the amount of unbalancing depending on the impedance of the units and the power factor of the load 78 Three-Phase, Two-Phase Connections The Scott connection shown in Fig
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1656 has the following advantages: It requires only two single-phase units or one two-phase unit It can be used with either three-wire or four-wire two-phase service Both two- and three-phase voltages can be obtained on the primary, with only four wires if the 866 percent tap of one winding is connected to the center of the other Disadvantages If the two transformers are duplicates, there must be a 50 percent tap and an 866 percent tap on each unit The three-phase side carries 15 percent more current than that corresponding to the two-phase side It therefore requires 15 percent more copper, or the two-phase side must be operated at 866 percent of its
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FIGURE 1654 Delta-Y connection
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FIGURE 1655 V-V connection
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FIGURE 1656 Three-phase two-phase transformer connection
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capacity The decreased use of two-phase systems limits the application of the Scott connection It is seldom, if ever, used for transformation of voltage without change in number of phases
79 Autotransformers An autotransformer differs from a regular transformer in
that it has only one winding instead of a primary and secondary winding The change in voltage is obtained by connecting the winding across the impressed voltage and tapping off another circuit with more or fewer turns The connection for single-phase is shown in Fig 1657 Autotransformers may be wound single-phase but usually are three-phase or two-phase Advantages For a given output, autotransformers are cheaper than transformers This economy is greater the nearer the ratio comes to unity Autotransformers also have better ef ciency and regulation than transformers This advantage also increases as the ratio approaches unity Disadvantages There are some serious disadvantages in the use of autotransformers The high- and low-voltage windings being continuous, the low-voltage circuit and connected apparatus are subjected to high voltage to ground and may be subjected to abnormal voltages due to disturbances and grounds on the high-voltage circuit This is particularly true when there is a large difference between voltages Short-circuit currents are larger with autotransformers, and this is worse as the voltage ratio approaches unity or the high and low voltages approach each other Except for starting compensators, autotransformers are seldom used where the ratio exceeds 2:1 Autotransformers are recommended for isolated systems and for grounded systems, provided the neutral of the autotransformer is also grounded But they are used most extensively for supplying a low voltage for starting synchronous or induction motors The Y connection shown in Fig 1658 is the most economical and therefore the most used autotransformer connection The ratio of rating to output is (E1 E2) / E1, where E1 is the low voltage The neutral may be grounded if the generator neutral is also grounded The disadvantages are the same as given for Y-Y transformers (see Sec 73) The V or open-delta connection (Fig 1659a) is free from third-voltage harmonics, and the ratio of rating to output is 15 percent more than for the Y connection The delta connection (Fig 1659b) has characteristics similar to those for transE 2) / 173 formers connected delta-delta (Sec 72) The rating to output is (E 2 1 2 E1 E2 The extended-delta connection (Fig 1659c) gives a ratio of rating to output of 1 025(E2 / E1)2 08666E2 / E1 or 173Ex / E1, where Ex is the voltage of the extended portion When the Y connection is undesirable, owing to the third har-
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