Review of AC (Small) Current Measurement Techniques

摘要

This study presents, a review of some techniques for Alternating Current (AC) measurement. It is an overview to acquaint the researcher a spot check of which best method to be chosen for small current measurement. In this review, introduction of current measurement chronology, principles, methods, advantages, disadvantages and some applications are discussed. The techniques considered includes Rogowski coil, Hall effect, Shunt resistor current, optical current, Optical current transformer, current transformer and mechanical current measurement method. Rogowski coil, inductive current measurement method, current could be measured without disturbing or interrupting the electric power system. Hall effect current measurement could be entirely integrated on a single silicon chip, resulting into low-cost, high-volume application in current measurement. Shunt resistor current measurement with ground referenced output voltage, easy single supply design, straight forward, easy and rarely requires more than an operational amplify to implement, inexpensive and precise in current measurement. These will result to low cost, better insulation, safety of personnel and equipment and quality of electric power system production and usage. So, depending on the desired electrical parameters needed, advantages and disadvantages from each or combination of these methods could be use to achieve efficient and effective current measurement, resulting to better control and regulation of electric power system.