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three windings on one core Another advantage of the three-phase transformer is that it is slightly more efficient than a single-phase transformer, and in the larger ratings it is less expensive A disadvantage of the three-phase transformer is that if one of its phases fails, the whole transformer is disabled and must be removed from service By contrast, if one of three single-phase transformers in a bank fails, that one unit can be replaced, leaving the other two in service Three-phase transformers can also be connected according to the four connection schemes previously discussed for single-phase transformers and illustrated in Fig 3-9 These connections are made inside the tank To make delta delta connections, only three high-voltage and three low-voltage conductors need to be brought outside the tank For wye-connected windings, however, four connections are brought outside the tank
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A three-phase overhead distribution transformer is shown in Fig 3-13 Where polemounted overhead distribution is used to supply three-phase power, three-phase transformers occupy less space than a bank of transformers, and they weigh less Moreover, the cost of installation and maintenance is lower for a three-phase overhead transformer than for a bank of three single-phase units Three-phase overhead transformers are made with ratings from 30 to 300 kVA Primary voltages range from 416 to 345 kV, and secondary voltages range from 120 to 480 V The basic impulse level (BIL) ratings are 45 to 150 kV They are available with wye, delta, or T T connections These transformers have four output connections, X0, X1, X2, and X3, and their cases are filled with electrical-grade mineral oil A three-phase, pad-mounted compartmental-type distribution transformer is shown in Fig 3-14 These transformers are manufactured in ratings from 45 to 7500 kVA with high-voltage ratings from 24 to 46 kV The standard connections are delta wye, grounded wye wye, delta delta, wye wye, and wye delta The transformers are housed in steel cabinets with front-opening, three-point latching steel doors As in the overhead transformers, the cases of pad-mounted transformers are filled with electrical-grade mineral oil
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For the successful operation of two single-phase transformers connected in parallel, the instantaneous polarities of the transformers must be known Two transformers with their primaries connected to the same power supply are shown in Fig 3-15 The primary windings of both transformers no 1 and no 2 are wound counterclockwise around the core However, the secondary winding of transformer no 1 is wound counterclockwise, while the secondary winding of transformer no 2 is wound clockwise At the instant line A is positive, the direction of current flow will be from line A to line B through both primary windings
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HANDWHEEL
BIRDGUARD
ARRESTER
LIFTING LUGS
LOW-VOLTAGE BUSHING
GROUNDING STRAP
COVER AND RING
RECESSED BOTTOM
Figure 3-13
Systems
Three-phase overhead distribution transformer
Courtesy Cooper Power
When primary current flows from H1 to H2, voltages are induced in the secondary windings, which oppose the applied primary voltages Because the secondaries are wound in opposite directions, terminal X2 of transformer no 1 is negative at any instant, while terminal X1 of transformer no 2 is positive If the secondary windings are to be connected in parallel, both positive terminals must be connected to one line, such as C, and both negative terminals must be connected to the other line, such as D The instantaneous voltages induced in the two secondary windings will then be in phase Caution: If terminals of unlike polarity are connected to the same line, the two secondaries will be short-circuited, resulting in excessive current flow
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DIAL-TYPE THERMOMETER
PRESSURE RELIEF 10" UPPER FILL PLUG DEVICE LIQUID-LEVEL GAUGE
NAMEPLATE LASERSCRIBED ANODIZED ALUMINUM
BAY-O-NET FUSE
PRESSURE/ VACUUM GAUGE LOW-VOLTAGE BUSHING
TAP CHANGER
HIGH-SECURITY CABINET GROUND PAD AND STRAP FOR XO
HIGH-VOLTAGE BUSHING WELL (200 A)
Figure 3-14
Power Systems
Three-phase pad-mounted compartmental-type transformer
Courtesy Cooper
Figure 3-15 Two transformers connected for parallel operation
Two three-phase transformers can also be connected in parallel if they are wound the same way, are connected with the same polarity, and have the same phase relationships Furthermore, if the two transformers have the same voltage ratings, the same turns ratios, the same impedances, and the same ratios of reactance to resistance, load current will be divided in proportion to the transformers kVA ratings, and there will be no phase differences between their currents However, if there are differences in any of these characteristics, load current can be divided unequally and phase differences can occur between the currents in the transformers
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