The REMMIT (remote magnetic field monitoring instrument transformer) system, a new method for the monitoring and protection of electrical networks, is described. The most significant aspect of this system is that by using remote magnetic field sensors the entire monitoring and protection function is physically and electrically isolated from the network under surveillance and hence cannot contribute to failure modes of that network. The REMMIT system allows both monitoring of a network of currents and realtime detection of fault conditions, where currents fail to flow solely along the defined paths.