Related Manuals for I-Gard DSP-OHMNI
Summary of Contents for I-Gard DSP-OHMNI
- Page 1 Cross Reference RA Part Number PN-252626 DSP - O H M N I VE R S I O N 2 HIgH RESISTANCE gROUNDINg SYSTEM the power to protect Instruction Manual C-429EM, DSP-OHMNI Version 2, June 2010...
- Page 2 I-Gard should be notified promptly if replacements for damaged goods are necessary. If units received are not to be installed immediately they should be stored in their original containers in an area free of dust and moisture.
- Page 3 Grounded systems. HRG prevents this event from happening by limiting the fault current to a sustainable level for an indefinite time. The DSP-OHMNI system will provide the user with an Alarm and indication of the location of the fault using a combination of voltage and current measurements.
- Page 4 OHMN system with ribbon cable jumpers. The DSP-DRM uses external I-Gard zero sequence current sensors and a NGRS Resistor sensor which provide voltage and current at the Neutral Grounding grounding resistor. The DSP-DRM uses the same Alarm system as the rest of the DSP-OHMNI system. See Section 12 for detailed information.
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Page 5: Installation
The OHMNI-PM is connected between ground and the Neutral (star) point of the transformer on Wye systems. On Delta systems an artificial neutral device (I-Gard Type DDAI) is required to provide a Neutral (star point). Both OHMNI-PM and DDAI devices are selected for appropriate current ‘let-through’, i.e.: The current, which will flow to ground, if there is a direct short from line to ground (on any one phase). - Page 6 Adjustable 01 to 99 minutes DSP-DSM Alarm Level Accuracy ±10% of IG Meter accuracy ±10% of IG Note: Accuracy based on single resistance fault, at nominal line voltage, without system capacitance. I-GARD DSP-OHMNI Instruction Manual 429EM Version 2, June 2010...