Current Measurement Using Noninvasive sensors in Mobile MV Substations: Modeling and Simulation

Continuous monitoring and measurement of current is an essential part of mobile power generation and distribution systems for protection and control. A noninvasive current sensing device can be easily installed near the main bus and three phase conductors before and after the power transformer. Traditional window-type current transformers need electrical isolation and grounding of the system for installation, maintenance and repair. A noninvasive design of the current transformers reduces all risks and electrical hazards in electrical isolation procedure and decrease the frequency and time of outage. This type of design gives more benefits in case of mobile substations of medium and high voltage where space constraint controls the equipment footprint. For application of such noninvasive devices, it is important to study and analyze the dynamics of magnetic fields surrounding the phase conductors where these current sensors are to be installed. This paper discusses the modeling and simulation analysis towards finding the best location for installation of noninvasive current sensors near a three-phase three-conductors medium voltage power system.