IEEE Std 1100-1992, IEEE Recommended Practice for Powering by IEEE

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Additional resources for IEEE Std 1100-1992, IEEE Recommended Practice for Powering and Grounding Sensitive Electronic Equipment

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The boundary between the two phenomena is not clear, and documents prepared by groups of different 48 Authorized licensed use limited to: IEEE Xplore. Downloaded on March 12, 2009 at 07:50 from IEEE Xplore. Restrictions apply. IEEE Stdlloo-1992 GENERAL NEEDS GUIDELINES backgrounds and interest can vary on the definition of this boundary. Noise effects are often lumped under the label of electromagnetic interference (EMU and addressed by frequency-domain-oriented specialists. Surge effects are generally addressed by time-domain-oriented specialists more concerned with damaging effects than upset effects.

Downloaded on March 12, 2009 at 07:50 from IEEE Xplore. Restrictions apply. IEEE std 1100-1992 CHAPTER 3 PARALLEL LOADS LIGHTNING t" RADIATED EM1 DATA LINKS ' --__-- - - FAULTS GROUND POTENTIAL RISE (a) Examples of InterfemnceThat Do Not Involve Utility Supply POWER SUPPLY ' LOAD SOFWARE INTERNAL EM1 NONLINEAR LOAD 4 OPERATOR ERROR - I I GROUND POTENTIAL RISE (b) Example of Source Interference Fig 3-1 Sources of Disturbances Load switching is a major cause of disturbances. Whenever a circuit containing capacitance and inductance is being switched on or off, a transient disturbance occurs because the currents and voltages do not reach their final value instantaneously.

This type of disturbance may be described a s harmonic distortion because it is easy to analyze as the superposition of harmonics t o the nominal frequency of the power system. Dissymmetry, also called unbalance, occurs when unequal single-phase loads are connected t o a three-phase system and cause a loss of symmetry. This type of disturbance primarily concerns rotating machines a n d threephase rectifiers and, as such, is not receiving broad attention. I t is important, however, for machine designers and users.

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