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This work is classified under the line of Electromagnetic Compatibility Research and analyzes the electrical model for theft mechanism widely implemented for semi-direct measurement; in order to understand the physical phenomena found and, in turn it generating some recommendations regarding situations that may lead to or allow implementing such mechanisms used in semi-direct measurement cells in the industrial sector in Bogota city. This paper is divided into four excerpts, namely in the first section it refers to the process that was undertaken for the obtaining of the electricity theft mechanism most commonly used in Bogota city, its ranking and description. In the second section it presents the development of the equivalent circuit, as well as theoretical and experimental tests conducted as part of the operational check. The third section is the documentation of the anomalies found in the cells of semi-direct measurement as they are identified as the main cause of theft mechanism implementation, and finally, in the fourth section, it presents the recommendations solution suggested for the anomalies found in those cells. To set the electric model, the semi-direct measurement line diagram was taken as a base, and mophasic equivalent circuit is done taking into account that the meter and current transformer (CT) are the main elements that operate this device. Right after, the analysis is performed by means of simulation of the circuit, considering this alteration through MATLAB Simulink tool, which identifies the cancellation of the current signal that goes to the meter because of the reverse current coming from the black box, and therefore consumption low register is verified, as evidenced by the curves of power and energy in the load. Later, experimental tests are performed, for which a prototype is built and measurement is performed with two different teams. As a result, it is identified that the black box mechanism is implemented through a split core transformer, installed in the phase that performs the cancellation of the current through an inductive coupling.

Análisis del modelo eléctrico del mecanismo de hurto de energía eléctrica más utilizado en el sector industrial de Bogotá