Definition
A NIS (Network Information System) models the grid's electrical interconnection: which transformer feeds which cable, where the switches sit, and how power actually flows through the network in a given operating state. It differs from GISGeographic Information System - system for collecting, storing and analyzing location-based data - used in network mapping and planning., which models the geographic location of the same components - a NIS answers "what is connected to what", a GIS answers "where in the terrain is it". In practice the two overlap heavily, and many grid companies use platforms covering both (e.g. Smallworld), but it is the electrical topology in the NIS that DMSDistribution Management System - system for real-time monitoring and control of the distribution network./ADMSAdvanced Distribution Management System - next-generation DMS with real-time management of distributed energy resources. reads from for fault management and load-flow calculations. NIS is not the same as NIS2EU directive on network and information security - imposes strict security requirements on critical infrastructure. (the EU cybersecurity directive) - same abbreviation, two entirely unrelated meanings.