Description:

Powerohm High Resistance Grounding Systems are an economical means of improving a three-phase ungrounded power system by providing the following advantages:

System Protection: Offers protection by providing a ground-to-neutral connection for a three-phase power system, while still allowing to operate as an "ungrounded system." When the neutral of a system is not grounded, the system is vulnerable to potentially damaging ground faults.

Transient Overvoltage Reduction: A high resistance grounding system reduces the magnitude of high transient overvoltages appearing during normal switching of a circuit having a ground fault. High transient overvoltages may cause failure of equipment or insulation at locations on the system other than at the point of the fault.

Ground Fault Detection Warning: Instantly provides a warning when the first ground fault occurs through an alarm signal. An optional audible horn or red warning beacon is available.

Ground Fault Location Simplified: A pulsing contactor allows the ground fault location to be quickly located by use of a portable clamp-on current detector. The ease and swiftness of ground fault location eliminates the need to trace faults by opening and closing secondary feeders, branch circuits and individual loads one at a time.

Uninterrupted Service: A single line-to-ground fault left in operation may result in a second ground fault. If a second fault occurs on another phase before the first is removed, considerable damage may be caused by the relatively high line-to-line fault current. The potential for quickly locating and removing faults before damage occurs to critical processes minimizes outages, and costly manufacturing shutdowns.

Improved Personnel Safety: Reducing transient overvoltages, equipment arcing, fault levels, insulation failures and fault tracing through circuit isolation schemes decreases hazards to personnel.