Apparatus and Methods Thereof for Error Correction in Split Core Current Transformers

摘要

Apparatus and methods are provided for electrical parameter measurements at points of interest, such as circuit breakers, machines, and the like. The devices which comprise of components that may require corrections, such as the errors induced by, but not limited to, the use of a split core mounted around a current carrier, and hence calibration coefficients are provided based on test, measurements and/or calculations respective of the devices. These coefficients may be stored in a database for retrieval when calibration of measurements received from a measuring device. In one embodiment at least one of the calibration coefficients is stored on the measuring device.

主权项

1. An apparatus comprising:
at least one analog section comprising a current transformer having a transformer core configured to mount around an alternating current (AC) power line making the AC power line a primary winding of the current transformer, the analog section for harvesting energy from a secondary winding on the transformer core, and storing it for use by components of the apparatus and periodically switching to allow sampling of a current flowing through the current transformer by a sense resistor; a microcontroller coupled to the at least one analog section to receive harvested energy, to determine at least one of: at least a value respective of the at least an analog signal responsive to the alternating current in the AC power line by the sense resistor, a time stamp; a memory coupled to the microcontroller the memory containing therein at least a calibration coefficient for correction of the at least a current measurement of the apparatus; and a transmitter enabled to periodically transmit, under the control of the microcontroller, information responsive to the power consumption of a load connected to the AC power line that includes at least one of: the at least the value, the time stamp, or the at least a calibration coefficient; such that a receiver of the at least a value may use the at least a value for determination of at least an electrical parameter.