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Intermatic AG Surge Protector. Product description Leviton's Surge Protection Devices can be used individually or as part of a coordinated application strategy, to protect sensitive electronic equipment, in industrial, commercial and residential locations, from the stress and degradation inflicted by voltage transients. From the Manufacturer Leviton's Surge Protection Devices can be used individually or as part of a coordinated application strategy, to protect sensitive electronic equipment, in industrial, commercial and residential locations, from the stress and degradation inflicted by voltage transients.
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It also makes it possible to produce a rotating magnetic field in an electric motor and generate other phase arrangements using transformers for instance, a two phase system using a Scott-T transformer. The symmetric three-phase systems described here are simply referred to as three-phase systems because, although it is possible to design and implement asymmetric three-phase power systems i.
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In a three-phase system feeding a balanced and linear load, the sum of the instantaneous currents of the three conductors is zero. In other words, the current in each conductor is equal in magnitude to the sum of the currents in the other two, but with the opposite sign. The return path for the current in any phase conductor is the other two phase conductors. As compared to a single-phase AC power supply that uses two conductors phase and neutral , a three-phase supply with no neutral and the same phase-to-ground voltage and current capacity per phase can transmit three times as much power using just 1.
Thus, the ratio of capacity to conductor material is doubled. Constant power transfer and cancelling phase currents would in theory be possible with any number greater than one of phases, maintaining the capacity-to-conductor material ratio that is twice that of single-phase power.
However, two-phase power results in a less smooth pulsating torque in a generator or motor making smooth power transfer a challenge , and more than three phases complicates infrastructure unnecessarily. Three-phase systems may also have a fourth wire, particularly in low-voltage distribution. This is the neutral wire. The neutral allows three separate single-phase supplies to be provided at a constant voltage and is commonly used for supplying groups of domestic properties which are each single-phase loads.
The connections are arranged so that, as far as possible in each group, equal power is drawn from each phase. Further up the distribution system , the currents are usually well balanced. Transformers may be wired in a way that they have a four-wire secondary but a three-wire primary while allowing unbalanced loads and the associated secondary-side neutral currents.
Three-phase supplies have properties that make them very desirable in electric power distribution systems:. Most household loads are single-phase.
Three-phase electric power
In North American residences, three-phase power might feed a multiple-unit apartment block, but the household loads are connected only as single phase. In lower-density areas, only a single phase might be used for distribution. Some high-power domestic appliances such as electric stoves and clothes dryers are powered by a split phase system at volts or from two phases of a three phase system at volts.
Wiring for the three phases is typically identified by color codes which vary by country. Connection of the phases in the right order is required to ensure the intended direction of rotation of three-phase motors. For example, pumps and fans may not work in reverse.
Maintaining the identity of phases is required if there is any possibility two sources can be connected at the same time; a direct interconnection between two different phases is a short-circuit. At the power station , an electrical generator converts mechanical power into a set of three AC electric currents , one from each coil or winding of the generator.
The generator frequency is typically 50 or 60 Hz , depending on the country. At the power station, transformers change the voltage from generators to a level suitable for transmission in order to minimize losses. After further voltage conversions in the transmission network, the voltage is finally transformed to the standard utilization before power is supplied to customers. Most automotive alternators generate three-phase AC and rectify it to DC with a diode bridge.
A "delta" connected transformer winding is connected between phases of a three-phase system.
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A "wye" transformer connects each winding from a phase wire to a common neutral point. In an "open delta" or "V" system, only two transformers are used. A closed delta made of three single-phase transformers can operate as an open delta if one of the transformers has failed or needs to be removed. Where a delta-fed system must be grounded for detection of stray current to ground or protection from surge voltages, a grounding transformer usually a zigzag transformer may be connected to allow ground fault currents to return from any phase to ground.
Another variation is a "corner grounded" delta system, which is a closed delta that is grounded at one of the junctions of transformers. There are two basic three-phase configurations: As shown in the diagram, a delta configuration requires only three wires for transmission but a wye star configuration may have a fourth wire. The fourth wire, if present, is provided as a neutral and is normally grounded.
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The "3-wire" and "4-wire" designations do not count the ground wire present above many transmission lines, which is solely for fault protection and does not carry current under normal use. A four-wire system with symmetrical voltages between phase and neutral is obtained when the neutral is connected to the "common star point" of all supply windings.
In such a system, all three phases will have the same magnitude of voltage relative to the neutral. Other non-symmetrical systems have been used. The four-wire wye system is used when a mixture of single-phase and three-phase loads are to be served, such as mixed lighting and motor loads.
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An example of application is local distribution in Europe and elsewhere , where each customer may be only fed from one phase and the neutral which is common to the three phases. When a group of customers sharing the neutral draw unequal phase currents, the common neutral wire carries the currents resulting from these imbalances. Electrical engineers try to design the three-phase power system for any one location so that the power drawn from each of three phases is the same, as far as possible at that site.
Hence, every effort is made by supply authorities to distribute the power drawn on each of the three phases over a large number of premises so that, on average, as nearly as possible a balanced load is seen at the point of supply.
In North America, a high-leg delta supply is sometimes used where one winding of a delta-connected transformer feeding the load is center-tapped and that center tap is grounded and connected as a neutral as shown in the second diagram. Divide the number 24 by 6. The answer is 4. Since 6 divided evenly, circuit 24 will be the same color as circuit 6. Using the panel or layout above find what color circuit 6 is. What color is circuit 11? Divide the number 11 by 6. The answer is 1 with a remainder of 5.