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Voltage Configuration of UPS Devices
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Voltage configuration of UPS devices involves precise identification of the electrical system is critical in the proper selection and application of a UPS device. Phase refers to difference between two or more alternating current waveforms. There are 360 degrees in a complete cycle (as a generator completes one rotation). 3-phase systems produce three sets of sine waves that are 120 degrees apart or "out of phase" from each other (3 x 120 = 360). That is phase a-b, b-c, and a-c are 120 degrees apart from each other. However, when you use only two of the legs of a 3-phase system, it is single phase since there is no other phase that it is "out of phase" with. The term two-phase is a misnomer, although many electricians use it. There is only ONE sine wave hence it is single-phase. Products & Services
Busways and busbars (conductor bars) provide current to distant or moving points along the path of an electrification system.
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Phase converters transform single-phase power into three-phase power for the operation of industrial motors, pumps, and other equipment.
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Uninterruptible power supplies (UPS) are backup batteries that provide emergency power to electrical systems in case power becomes unavailable. They are connected between a power source (such as an electrical outlet) and the equipment to protect (such as a motor or computer).
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Learn more about Uninterruptible Power Supplies (UPS)
RF phase shifters are twin-ported devices that alter the phase of an output signal in response to an external signal.
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Learn more about RF Phase Shifters
Panelboards and switchgear are electrical distribution devices that convert incoming electrical power into several smaller circuits and provide overload protection in the form of fuses or circuit breakers.
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Learn more about Panelboards and Switchgear
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Topics of Interest
This chapter is an introduction to three-phase power systems. The advantages of three-phase system operation are listed and computations of three phase systems are illustrated by several examples.
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In a dc machine, the mechanical commutator ensures that current flows
in the machine windings in a manner that will produce useful torque,
even when the rotor changes position and speed. From a...
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Discussions of and problems related to single-phase KVA and power factors, three-phase power factor and line current, phase sequence, unbalanced load, power factor correction, transmission line,...
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Acknowledgment
This text originates from Chap. 10 of a book titled Uninterruptible Power Supplies published in 1992 by Peter Peregrinus Ltd. on behalf of the Institution of Electrical Engineers of...
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H.1 Expressions
It is well known that a delta to delta-wye three-winding transformer feeding a 12-pulse converter will eliminate harmonics of order 6 n 1 in the primary current, but just how this is...
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