FREQUENCY CHANGING EFFECT ON CURRENT TRANSFORMER CLASS 0.5S Hendy Heryanto Surya(a*), Budi Sudiarto (b)
(a) Department of Electrical Engineering, University of Indonesia. hendyheryanto[at]yahoo.com
(b) Department of Electrical Engineering, University of Indonesia.
Abstract
This paper is aiming the frequency changing effect to an instrument current transformer, which is used in a measurement of an energy billing. As a technology is developing, the usage of non-linear load is increase. This will cause a problem in a power quality of an electrical system. This disturbance of power quality effected the working frequency on electrical system. As current transformer is one of the equipment in the system, when the primary of a current transformer is disturbed, it could also affected the secondary side. The result shows that the frequency changing has an effect to error ratio and phase displacement on a current transformer class 0.5s which will decrease while the frequency is increase but still within the standard limit. Frequency changing also has an effect on Security Factor on an instrument, which will increase when the frequency is increase. So, it is important to keep frequency within the fundamental frequency.
Keywords: Current Transformer, Accuracy Class, Frequency
