ЭЛЕКТРОННАЯ СИСТЕМА КОНТРОЛЯ РАСПРЕДЕЛИТЕЛЬНЫХ СЕТЕЙ НАПРЯЖЕНИЕМ 0,4 КВ

In the overall structure of electricity consumers township electric networks occupy an important place. The predominance in these networks of single-phase consumers with the probabilistic nature of the values of their load does not allow to maintain at the dispatch level the most cost-symmetric with respect to the phases of operation power lines, which necessitates the use of simulation for their modes of mathematical models, including all phases of the constituent elements of these networks. Considered power lines are also characterized by the relative instability of structures in service networks, due to the transfer of individual customers from one phase to another, by transfer from consumers to the single phase power supply, installation of additional lighting and others. In such power lines siphoning off electricity often takes place, mainly it is lashed out at the bare wire, installation of magnets or unrolling device for induction meters and others. To improve the quality control of operating modes of lowvoltage distribution networks we designed a block diagram of locating unauthorized selection of electric energy based on the principle of a longitudinal differential current comparison, which does not require registration of angular shifts of current vectors. To control the network parameters and locate the sites of theft of electricity we created by a current sensor, in which the sensor scheme provides wireless transmission of data to the control station or repeater with the drive. Converting an analog signal to a digital form allows the sensor to match the computer hardware and ensure sufficient noise immunity for transmission over the air. A program based on a PC, which allows to perform calculations of modes of low-voltage networks with a voltage of 0.4 kV with the most determining factors of calculation: load unbalance phase power line, mutual inductions between the wires of its double-circuit parts, deterministic and probabilistic values of variables and loads of consumers, etc. The calculations of the modes of the distribution network voltage of 0.4 kV made it possible to establish the metrological characteristics of the current sensor and to determine the maximum permissible value of sensor error (3 %). Results of the modelling of the distribution network related to the breaking of the phase conductors, allowed developing a detection algorithm for breaks of the wire transmission line.