By IEEE
ISBN-10: 1559377305
ISBN-13: 9781559377300
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Extra info for IEEE Guide for Instrumentation and Control Equipment Grounding in Generating Stations
Sample text
Note that Þgures 12, 13, 14, 15, 16, and 17 depict an additional local safety ground for each cabinet in addition to the equipment grounding conductor provided with the incoming power cables. When provided, this additional connection will enhance personnel safety by providing an additional low impedance path to ground. Additionally, the bus bars illustrated by Þgures 12, 13 and 17 are shown schematically for clarity. They are typically located within a master control cabinet, rather than provided as separate, external buses.
Combined with other practices of minimizing noise generation in a generating station, this system has been proven to provide protection to minimize coupling to acceptable levels. More sensitive signal and processing systems can be treated separately with the shield grounded at the source end. 38 GROUNDING IN GENERATING STATIONS IEEE Std 1050-1996 In addition to countering the above three disadvantages of conventional practice, the CDF provides an ideal system to permit trunk cabling systems. These may have substantial cost and schedule advantages.
In this type of cable, the outer conductor (shield) acts as a return path and also provides a bleed-off for stray voltages. At lower frequencies, the return current travels primarily through the ground plane rather than through the shield. Therefore, at low frequencies, the shield offers practically no magnetic shielding. 5Ð10 kHz. As the frequency increases above the cutoff frequency, the shield offers increasing attenuation. The improvement in shielding effectiveness is due to the reduction in loop area caused by current returning on the shield, rather than via the ground plane, and not by any magnetic shielding properties of the shield itself.
IEEE Guide for Instrumentation and Control Equipment Grounding in Generating Stations by IEEE
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