The merits of High Resistance Grounding (HRG), design considerations, and potential safety issues, prior to its application have been well documented in past Electrical Safety Workshops. At the 2008 IEEE Electrical Safety Workshop, a challenge was put forth to discuss current and developing technologies that can resolve some of the potential safety issues. A field survey was conducted and research was performed to identify these issues. This paper discusses each potential safety issue and cross-references it with a current or developing technology to assist the user during the design, operation, and maintenance stages. These advancements in technologies have the ability to resolve the potential safety issues, establishing a safer, smarter HRG system.
The application of high-resistance neutral grounding (HRNG) to medium-voltage systems is one of the least understood and often misapplied methods of system neutral grounding. An HRNG grounded system is the only intentionally grounded neutral grounding method suitable for industrial systems that allows normal operation (no voltage dips, no power surges, no shutdowns, minimal damage) for an indefinite time period after the inception of the most common of all faults, the single-line-to-ground fault. The complexity of applying an HRNG system is due to lesser understood factors such as the relationship between system charging current, neutral grounding resistor let-thru current and point-of-fault ground-fault current; point-of-fault arcing voltage magnitudes; escalating arcing fault phenomena and point-of-fault energy levels, all of which are not easily determined nor easily estimated. This paper addresses the application of HRNG neutral grounding systems on mediumvoltage industrial AC power systems. The seemingly perfect HRNG grounding system, with ground-fault current magnitudes often limited to 10 A or less, has a limited window of application on medium-voltage systems, such that when misapplied may actually place the electrical system backbone components at risk, as well as, trip the system off line due to escalating arcing faults
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.