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Interpretation of power phenomena in three phase systems with
Interpretation of power phenomena in three phase systems with

A Progressive Way to Integrate Current Measurement into Modern Abstract
A Progressive Way to Integrate Current Measurement into Modern Abstract

1. Introduction - About the journal
1. Introduction - About the journal

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... • 1% voltage unbalance (V2) relates to 6% current unbalance (I2) • For small and medium sized motors, only current transformers (CTs) are available and no voltage transformers (VTs). Measure current unbalance and protect motor. • The heating effect caused by current unbalance will be protected by en ...
IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE) e-ISSN: 2278-1676,p-ISSN: 2320-3331,
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... much as possible. In literature, to avoid PQ problem, there are a variety of Custom Power Devices (CPDs) such as Distribution Static compensator (DSTATCOM), the Dynamic voltage restorer (DVR), uninterruptible power supply (UPS), Solid State Transfer Switch (SSTS), UPQC etc. are discussed [18]. UPQC ...
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... source on branch s to the voltage or current of a resistor on branch r has always the same sign, be it positive or negative, depends on whether or not the solution of the D2-circuit has always the same sign on branch r. Since the D2 -circuit is linear, its solution is obtained by superposition of th ...
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... allowed to affect external circuits which may be sensitive to interference. They also serve to suppress any potential RF feed through between stages via the ZNBG3118. These capacitors are required for all stages used. Values around 10nF are recommended however this is design dependent and any value ...
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Ground (electricity)



In electrical engineering, ground or earth is the reference point in an electrical circuit from which voltages are measured, a common return path for electric current, or a direct physical connection to the Earth.Electrical circuits may be connected to ground (earth) for several reasons. In mains powered equipment, exposed metal parts are connected to ground to prevent user contact with dangerous voltage if electrical insulation fails. Connections to ground limit the build-up of static electricity when handling flammable products or electrostatic-sensitive devices. In some telegraph and power transmission circuits, the earth itself can be used as one conductor of the circuit, saving the cost of installing a separate return conductor (see single-wire earth return).For measurement purposes, the Earth serves as a (reasonably) constant potential reference against which other potentials can be measured. An electrical ground system should have an appropriate current-carrying capability to serve as an adequate zero-voltage reference level. In electronic circuit theory, a ""ground"" is usually idealized as an infinite source or sink for charge, which can absorb an unlimited amount of current without changing its potential. Where a real ground connection has a significant resistance, the approximation of zero potential is no longer valid. Stray voltages or earth potential rise effects will occur, which may create noise in signals or if large enough will produce an electric shock hazard.The use of the term ground (or earth) is so common in electrical and electronics applications that circuits in portable electronic devices such as cell phones and media players as well as circuits in vehicles may be spoken of as having a ""ground"" connection without any actual connection to the Earth, despite ""common"" being a more appropriate term for such a connection. This is usually a large conductor attached to one side of the power supply (such as the ""ground plane"" on a printed circuit board) which serves as the common return path for current from many different components in the circuit.
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