Modern structure of energy consumption is de-termined by expanding the nonlinear load, the na-ture of which is determined by the algorithm of functioning of secondary power supply. For this reason power supplying organizations faced a seri-ous problem of "contamination" distribution net-works higher relative to industrial frequency har-monics. To reduce higher harmonics in the case of continued non-linear load resistance is possible to use filter-based devices passive filters. Numerical modeling of a network with the proposed scheme of the filter-device is made and the calculation of reli- ability, proving that the use of four-pointed filter provides mean time to failure close to the time of the service core network equipment is executed. The proposed filter topology consists of three branches with three identical resistors and a neutral branch. This scheme allows reducing the total number of reactive elements forming the filter, and to increase economic efficiency, such as lighting networks, compared to traditional schemes. By means of such scheme the power filter with two resonant frequencies is formed. One resonant fre-quency is for harmonic currents forming the sym-metric components of direct and reverse sequenc-es, and the second resonant frequency is for the currents, forming a system of zero sequence. For the implementation of the scheme only passive el-ements are used. Static and dynamic characteris-tics of a power line with the offered scheme of the filter-device by the results of numerical modeling are given. Comparative calculation of reliability, confirming that the use of 4-prong filter keeps the level of the time between failures of basic elements of a network is made. The assessment of the level of reliability is made on the accounting of the relia-bility of each circuit element involved in the algo-rithm for the conversion of electrical quantities. This technique allows taking into account the failure rate during the service time of the device. In accordance with the methodology of the calculation is produced by the "λ- parameters", based on the failure rate of components and correction factors that take into account the real conditions and modes of opera-tion.
reliability, filter-device, the nonlinear load, harmonic components
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