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Current sensor

Current sensors are used in the electric power industry to measure current flowing in electrical systems. Electrical current sensing is used in many applications. In particular, current sensors may be used in electrical switchgear such as circuit breakers, and switches to determine when a fault has occurred in the electrical system. Current sensors for detecting DC currents have been widely used in a variety of fields, such as, home electric appliances (air conditioners, automatic washing machines, sewing machines, etc.), industrial equipment and transportation equipment. There are two common methods used to sense the current. The first method detects and measures the magnetic field produced by the current flowing in a conductor (inductive systems). A second method of current sensing uses a `shunt` resistance in the current path to generate a voltage across the shunt resistance in proportion to the current flowing. A variety of sensors are used to measure the amount of current flowing through a conductor. Eddy current sensors are known and widely used in a variety of applications to measure characteristics of moving, electrically conductive objects. A common use of eddy current sensors is in fans and turbines, where the sensors are used to measure parameters related to blade status. A hall effect current sensor measures current flowing through a conductor and provides an output signal proportional to the level of current. Hall effect current sensors offer several advantages over traditional current transformers such as a more compact size, higher current levels for a given size, and a larger frequency bandwidth. AC current sensors typical comprise inductive elements into which current is induced by the changing magnetic field surrounding an AC current conductor.

Current sensor product listings

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