Monitoring of Electricity Consumption by Measurements in Selected Network Nodes

Abstract

The tasks of identifying points of unauthorized power takeoff in a distributive network by measurements in some selected nodes have a lot of applications. The practical interest in solving them increases with a reduction in the number of network nodes necessary for monitoring. At a relatively constant voltage in the distributive network nodes, the determination of consumer capacities is confined to determining the parameters of the equivalent circuits of the latter. The determination of parameters by measurement results is a classic inverse problem from the circuit theory. This article proposes the solution of this problem for a 0.4-kV triphase distributive network with 9–12 loads to be controlled at measurements only in two nodes of the network. To solve this problem, it is proposed to set variable conductivity in one of the measurement nodes. The general approach to solving the problems of the considered type is provided. The derived solutions can be used to control the state of insulators in high-voltage lines and temperatures or humidity in hard-to-reach zones. The solutions derived for the 9- to 12-load network are relatively simple and allow promptly obtaining information on the network loads from the measured data. In addition, a solution for determining the EMF of several parallel-connected thermocouples and used as temperature sensors is provided.