| Electrical quantity sensing technology is a critical technology for measuring,monitoring,and managing electrical energy use.It enables us to establish better situation awareness and energy management of industrial,business and residential energy systems in order to improve efficiency and reduce emission.However,the existing sensors have many shortcomings and cannot meet the development needs of the digitalization of the power grid.Most of the existing current sensing technology is designed for single conductors,which is unable to work on multiple-conductor systems.Whether it is a double-circuit power supply line for a single phase system or a three-phase cable widely used in the three-phase system,when the load is working normally,the conductors in it cannot be measured one by one without damaging the conductor package,which may cause safety hazard.In addition,the phase angle of the current and voltage in the system is constantly changing.Without a voltage reference,the phase angle information obtained by the current sensor cannot be used for calculations such as harmonic vector calculations.Therefore,non-intrusive current and voltage integrated sensing device is the research direction of electrical quantity sensing technology.Based on the actual requirements of electrical quantity measurement in different application scenarios,this paper proposes two designs for non-intrusive electromagnetic integrated sensors for singlephase systems and non-intrusive full-current sensor arrays for three-phase systems,and develops prototypes to complete verification.The designed non-intrusive measurement device can be easily installed in a variety of multi-conductor systems,and its measurement accuracy can meet the requirements of most applications. |
