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Three single-phase transformers can be connected in an autotransformer arrangement to obtain a neutral from a three-phase, three-wire supply (phase shifting) Figure 3-16a is the schematic diagram for this arrangement, and Fig 3-16b is the wiring diagram
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Figure 3-16 Auto zigzag grounding transformer: (a) for deriving a neutral; (b) wiring diagram
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Section 4 of NEC 2002, Article 450, covers autotransformers, and Section 5 covers grounding autotransformers, specifically zigzag or T-connected transformers connected to three-phase, three-wire ungrounded systems These connections are made for creating three-phase, four-wire distribution systems or providing a neutral reference for grounding purposes
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The buck-boost transformer is a simple and economical means for raising a voltage that is too low or decreasing a voltage that is too high This transformer can raise or lower voltage being supplied to the load more than 5 percent, to improve the efficiency of the device or system Buck-boost transformers are small single-phase transformers designed to reduce (buck) or raise (boost) line voltage from 5 to 20 percent A common application is boosting 208 V to 230 or 240 V AC For example, there might be a requirement to power the motor in an air conditioner with a 230- or 240-V AC motor from the 208-V AC supply line This can be done with a buckboost transformer Buck-boost transformers are standard distribution transformers with ratings ranging from 50 VA to 10 kVA Commercial units are made with primary voltages of 120, 240, or 480 V AC They can also power low-voltage circuits for control or lighting applications requiring 12, 16, 24, 32, or 48 V AC Schematics of buck-boost transformers that can transform 120 and 240 V AC to 12 and 24 V AC are shown in Fig 3-17 When the primary and secondary lead wires of buck-boost transformers are connected together electrically in a recommended bucking or boosting connection, they
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Figure 3-17 Wiring diagrams for low-voltage, single-phase, buck-boost transformers
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become autotransformers Some typical connection diagrams for these transformers in autotransformer arrangements for single-phase systems are shown in Fig 3-18 Buck-boost transformers have four windings for versatility Their two primary and two secondary windings can be connected eight different ways to provide many different voltage and kVA outputs Because their output voltage is a function of input voltage, they cannot be used as voltage stabilizers Output voltage will vary by the same percentage as the input voltage These transformers can also function in three-phase systems Two or three units can be used to buck or boost three-phase voltage The number of units needed in a three-phase installation depends on the number of wires in the supply line
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Instrument transformers are used in power stations and substations to reduce high voltages and currents to safe and usable values for making electrical measurements with voltmeters, ammeters, and wattmeters, or to operate control apparatus These transformers perform two functions: they act as ratio devices, making it possible to use standard low-voltage and
Figure 3-18 Connection diagrams for buck-boost transformers in autotransformer arrangements for single-phase systems
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low-current instruments and controls; and they act as isolators to protect the instruments, controls, and personnel from high voltages The two kinds of instrument transformers are voltage transformers (also called potential transformers) and current transformers These transformers operate on the same principles as power transformers
Voltage transformers Voltage or potential transformers (VTs) are single-phase transformers that supply voltage to measurement instruments such as voltmeters, frequency meters, power factor meters, and watthour meters, as well as controls The voltage applied to sensitive meters and controls is a fixed fraction of the higher line voltage being measured, low enough to be used by the instruments and controls without damaging or destroying them The primary winding of a VT is always connected across the main power lines, as shown in Fig 3-19 These transformers are made to regulate the secondary voltage so that it will remain constant or nearly constant under all conditions When the primary winding is connected across the line, the current flowing in the winding sets up a field in the core This field linking the secondary winding induces a voltage that is proportional to the ratio of primary to secondary turns Most voltage transformers are designed for 120-V AC operation at the secondary terminals when the high voltage is applied at the primary winding Because the load supplied by the VT is small, VA ratings are small, of the order of 50 to 200 VA Voltage transformers are typically rated for 120 to 460 V AC, 50 VA If VTs are to make measurements on three-phase systems, sets of two or three transformers are installed There are, however, higher-rated, oil-filled VTs, rated up to 500 kV for use outdoors , in substation switching yards Current transformers Current transformers (CTs) step down line current to val-
ues that can be used to operate standard low-current measuring instruments and control devices without damaging them These instruments and control devices are completely
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