Transcription of Chapter 2 Grounding & Shielding
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Chapter 2 Grounding & Shielding
47 Chapter 2 Grounding & ShieldingSafety, system protection and performance are the three main reasons to earth asystem. Not all electronic equipment needs to be connected to earth to work,satellites are an example. Sometimes wrong Grounding configurations, oriented tosatisfy the special power and performance requirements of electronic loadingequipment, can compromise safety rules generating dangerous situations forpersonnel and equipment. Personnel safety , equipment safety and performancegrounding issues have to be analyzed together. In any case, safety rules must not beviolated. All these concepts as well as the relations between ground issues need tobe clarified before passing on to a higher level in the control of the electromagneticemissions of the system.
The grounding of power systems is, from a safety standpoint, oriented to limit the potential difference between grounded objects, to provide a good operation of over-current protective devices in case of ground fault, to stabilize the phase voltages with reference to ground and to limit transient voltages due to lightning and load switching.
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