dilbert247365 said:What are the pros/cons of high resistance grounding versus solid grounding and low resistance grounding? What is the preference for different applications? What complications does high resistance grounding introduce in drive system applications?
Thank you.
High resistance grounding (HRG) is a method of grounding electrical systems in which a resistor is placed between the neutral point of the system and ground. This creates a deliberate and controlled amount of resistance in the ground circuit, typically between 100-500 ohms.
HRG systems are used to limit the fault current that flows in the event of a ground fault. This allows for early detection and isolation of the fault, reducing the potential for equipment damage and downtime. It also reduces the risk of electric shock to personnel.
The main advantage of HRG is that it allows for continued operation of the system during a ground fault. This is especially important in critical facilities such as hospitals and data centers. Additionally, the lower fault current reduces the risk of arc flash incidents and minimizes damage to equipment.
One potential disadvantage of HRG is that it can be more complex and expensive to install compared to traditional low resistance grounding systems. Additionally, a ground fault must be detected and addressed quickly to prevent potential damage to the system.
Regular maintenance is important for ensuring the effectiveness of an HRG system. This includes periodic testing of the ground resistance, as well as inspections for any damage or corrosion of the grounding components. It is also important to follow any manufacturer recommendations for maintenance and replacement of components.