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Micrologic P fonctionnement
Micrologic P fonctionnement

...  ZSI enables the control units to communicate with each other. The system is able to locate the short circuit or ground fault and clear it.  Functionning :  ZSI allows the circuit breaker to ignore its preset delay when necessary. The fault is cleared by the nearest upstream circuit breaker with ...
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... .Considering from the terminals of the voltage transformer, one can reduce the lines to a single-phase source in series with a capacitance by applying the Thevenin theorem. He same procedure is repeated for each phase of the disconnected line.It is established that Ferro-resonance occurs only except ...
Low Voltage Wiring
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... might not have ever received any hands-on business training other than estimating, scheduling, and other one-dimensional office tasks. Because of this tendency, when mechanics start companies, they might have spent very little time dealing with the overview elements of business, such as long-range p ...
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... can be found in ANSI/IEEE C37.46. In the majority of cases, it is not necessary to use the next higher fuse rating since a lower rating will likely be selected to provide necessary short circuit protection for the particular transformer involved. Circuit breakers used for above 600 V applications ge ...
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... small and, worse still, it collapses almost completely when a load is connected across the secondary terminals. In most industrial transformers, the primary and secondary windings are wound on top of each other to improve the coupling between them. ...
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... Transformers for use at power or audio frequencies typically have cores made of high permeability silicon steel. The steel has a permeability many times that of free space, and the core thus serves to greatly reduce the magnetizing current, and confine the flux to a path which closely couples the wi ...
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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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