Detect Ground Fault
Detect Ground Fault
(OP)
How can we detect the ground fault location in HRG or floating ground sytem.
XFMR is Delta -Wye
XO is not grounded or HRG is installed.
Thanks
XFMR is Delta -Wye
XO is not grounded or HRG is installed.
Thanks






RE: Detect Ground Fault
RE: Detect Ground Fault
Locating the fault is not nearly as easy. Some HRG systems allow the ground resistance to be alternated between two values, producing two current levels, such as 10A and 5A. With proper instrumentation it is possible to trace this pulsing current to the ground fault. Other than that turning circuits off one at a time is a good means of isolating the fault.
Unless an element specifically states otherwise, you will find that numeric relays operate on fundamental current or voltage, ignoring harmonics. Some times harmonics are used for blocking, and third harmonic voltage is used in generator protection, but for the most part it will be only the fundamental that is considered by the relay.