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the additional ground rods This creates a possible transient voltage problem for equipment and a possible overload problem for the conductors
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1046 Ground loops
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Ground loops are one of the most important grounding problems in many commercial and industrial environments that include data processing and communication equipment If two devices are grounded via different paths and a communication cable between the devices provides another ground connection between them, a ground loop results Slightly different potentials in the two power system grounds can cause circulating currents in this ground loop if there is indeed a complete path Even if there is not a complete path, the insulation that is preventing current flow may flash over because the communication circuit insulation levels are generally quite low Likewise, very low magnitudes of circulating current can cause serious noise problems The best solution to this problem in many cases is to use optical couplers in the communication lines, thereby eliminating the ground loop and providing adequate insulation to withstand transient overvoltages When this is not practical, the grounded conductors in the signal cable may have to be supplemented with heavier conductors or better shielding Equipment on both ends of the cable should be protected with arresters in addition to the improved grounding because of the coupling that can still occur into signal circuits
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1047 Insufficient neutral conductor
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Switch-mode power supplies and fluorescent lighting with electronic ballasts are widely used in commercial environments The high thirdharmonic content present in these load currents can have a very important impact on the required neutral conductor rating for the supply circuits Third-harmonic currents in a balanced system appear in the zerosequence circuit This means that third-harmonic currents from three single-phase loads will add in the neutral, rather than cancel as is the case for the 60-Hz current In typical commercial buildings with a diversity of switched-mode power supply loads, the neutral current is typically in the range 140 to 170 percent of the fundamental frequency phase current magnitude The possible solutions to neutral conductor overloading include the following:
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Run a separate neutral conductor for each phase in a three-phase circuit that serves single-phase nonlinear loads
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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When a shared neutral must be used in a three-phase circuit with single-phase nonlinear loads, the neutral conductor capacity should be approximately double the phase conductor capacity Delta-wye transformers (see Sec 1056) designed for nonlinear loads can be used to limit the penetration of high neutral currents These transformers should be placed as close as possible to the nonlinear loads (eg, in the computer room) The neutral conductors on the secondary of each separately derived system must be rated based on the expected neutral current magnitudes Filters to control the third-harmonic current that can be placed at the individual loads are becoming available These will be an alternative in existing installations where changing the wiring may be an expensive proposition Zigzag transformers provide a low impedance for zero-sequence harmonic currents and, like filters, can be placed at various places along the three-phase circuit to shorten the path of third-harmonic currents and better disperse them
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105 Solutions to Wiring and Grounding Problems
1051 Proper grounding practices
Figure 103 illustrates the basic elements of a properly grounded electrical system The important elements of the electrical system grounding are described in Secs 1052 to 1055
SERVICE TRANSFORMER
FEEDER Grounded Grounding Service Electrode Conductor BUILDING SERVICE EQUIPMENT GroundingElectrode Conductor N Bonding Jumper G Building Grounding Electrode
PANEL BRANCH BOARD CIRCUIT
LOAD
Phase Conductor (Hot) Grounded Conductor (Neutral) Insulated Ground Conductor (Green Wire) Conduit/Enclosure
G Receptacle
Figure 103 Basic elements of a properly grounded electrical system
Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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