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A resistance-grounded distribution system has a critical element that is often forgotten -the neutral-grounding resistor (NGR). Because NGR's are subject to failures [1] related to thermal overload, lightning, storms, extended service life, manufacturing faults, vibration, corrosion, and improper specification or installation, the proper monitoring of NGR health is important as all other protections to preserve distribution system in safe state.

This paper describes innovative method of ICT network infrastructure monitoring for vital network services required in DSO's Smart Grids environment. Services monitored are of fundamental importance for connectivity and data flows between DSO's Control Centre and remote Substations and their specific Smart Grid applications. The paper deals with the concept and some Use Cases taken from realistic DSO environment pointing to effectiveness of the method used.

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