IMPROVING THE ACCURACY ELECTRICITY METERING IN THREE-PHASE HIGH-VOLTAGE ELECTRICAL NETWORKS

Abstract

Reliable information on the consumed electric power is determined by measuring the volume of resources with regard to their functional reliability. But as the probability of failure of measuring systems for a certain period of time is almost impossible to determine, as they are hidden and can not be identified at the time of their occurrence, the losses of consumers and producers may be significant. Therefore, the problem of ensuring energy market participants with reliable information concerning the results of measurement and evaluation of electric energy losses due to functional failures measurement system is quite relevant at the stage of mass adoption of the system of advanced electronic electricity meters with the function of fixing the functional failure. To compensate for the measurement error arising due to functional failure of the measuring system and determine the actual amount of the measured electric energy is proposed to use correcting coefficient (correcting coefficient) for the different measuring systems and fault type. To determine the correcting coefficient methods used graphic vector construction and expansion of asymmetrical three-phase systems, imitation, and structural modeling method using automated digital processing. The block-simulation model of the measurement system to determine the correcting coefficient to compensate for electrical energy measurement error in 3-wire and 4-wire electrical networks in the presence of current direct and reverse order.
In the case of functional failure of the measuring complex, corrective coefficients can be used to compensate for the effect of the i-th element of the stability characteristics of the system as a whole. In turn, since the functional reliability of measurement means defined, including their stability, the use of corrective coefficients improves the functional reliability as a whole. In this case, the use of corrective coefficients is also one of the possible means to improve the stability and functional reliability of the measurement system. To find the correcting coefficients was carried Classification of types of measuring systems, types of possible functional failure of their elements and the nature of the download. In particular, the share of the system used to measure electric power 3-phase counters in 3-wire electrical networks temple voltage and 4-wire low-voltage networks, the number of different elements. In work processes of measuring active and reactive energy electronic 2- element and 3-element electricity counters of different types of 3- wire and 4-wire electrical networks in the event of symmetrical and asymmetrical load.