Solidly grounded systems
- Thread starter bigfish92
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Re: Solidly grounded systems
A solid grounded system has the grounded conductor connected to a GE with a conductor sized per 250.66.
An impedance grounded system has the grounded conductor connected to the GE through a calculated resistor or inductor to limit the amount of fault current during a L-G fault.
A solid grounded system has the grounded conductor connected to a GE with a conductor sized per 250.66.
An impedance grounded system has the grounded conductor connected to the GE through a calculated resistor or inductor to limit the amount of fault current during a L-G fault.
Ed MacLaren
Senior Member
Re: Solidly grounded systems
This sketch might help with the basic layout of a typical resistance/impedance grounded installation.
Line-to-neutral loads cannot be served by the resistance grounded system. If line to neutral loads, such as lighting, are to be served, a separately derived source transformer can be installed to establish a system that has a solidly grounded (neutral) conductor.
Ed
[ October 02, 2003, 12:46 PM: Message edited by: Ed MacLaren ]
This sketch might help with the basic layout of a typical resistance/impedance grounded installation.
Line-to-neutral loads cannot be served by the resistance grounded system. If line to neutral loads, such as lighting, are to be served, a separately derived source transformer can be installed to establish a system that has a solidly grounded (neutral) conductor.
Ed
[ October 02, 2003, 12:46 PM: Message edited by: Ed MacLaren ]
Re: Solidly grounded systems
Good drawing ED. Low voltage systems are are frequently operated solidly grounded. Reason being are the line-to-neutral loads common in these systems. For low-voltage systems without L-N loads, solid or high resistance grounding are the practical choices. Low resistance grounding is usually not considered since it would require the use of sensitive protective relaying (expensive) throughout the system.
High resistance grounding can be used for alarm only applications where service continuity is of prime concern, and if the fault circuit can be located and isolated with little delay
Good drawing ED. Low voltage systems are are frequently operated solidly grounded. Reason being are the line-to-neutral loads common in these systems. For low-voltage systems without L-N loads, solid or high resistance grounding are the practical choices. Low resistance grounding is usually not considered since it would require the use of sensitive protective relaying (expensive) throughout the system.
High resistance grounding can be used for alarm only applications where service continuity is of prime concern, and if the fault circuit can be located and isolated with little delay
Ed MacLaren
Senior Member
Re: Solidly grounded systems
Sorry guys, I missed the fact that bigfish92 was referring to low-impedance grounding.
Ed
[ October 02, 2003, 01:33 PM: Message edited by: Ed MacLaren ]
Sorry guys, I missed the fact that bigfish92 was referring to low-impedance grounding.
Ed
[ October 02, 2003, 01:33 PM: Message edited by: Ed MacLaren ]
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