Calculation of the change in the technical condition index of a facility when using a device distorting power quality indicators at mass construction sites in Moscow

The mechanisms of influence of devices distorting power quality indicators on the key electrical processes in the power supply system of the building are considered. Existing methods for compensating harmonic current and voltage fluctuations are mainly related to circuitry-based, engineering and organizational solutions. Modern engineering solutions imply supplementing electrical installations of the building with complex devices that incorporate semiconductor transducers. In addition to performing their primary function, these devices act as sources of additional emission of current and voltage distortions. The use of these technologies contributes to an increase in the efficiency index and leads to a decrease in the reliability index of the electrical installation. To determine the resulting technical condition index, an existing approach was used based on three groups of indicators: efficiency, operational reliability, and environmental friendliness of the installation under study.

On the example of the experiments performed, an assessment was made of the change in the technical condition index when a device distorting the power quality indicators is turned on. Data arrays have been collected on changes in the quality of electrical energy measured using analyzers. The change in the value of the operational reliability index is calculated. When a noise generator is connected to the cable before the load, the calculated probability of system failsafe operation increases by 2.86%. At the same time, for the circuit under consideration, the total harmonic distortion coefficient increases by at least 13%. The results show that the process of upgrading the power supply system of buildings, combined with the use of complex semiconductor technology, may adversely affect the technical condition index (TCI) of the system. The method for determining the TCI value based on the arithmetic mean approach to averaging the indices of efficiency, operational reliability, and environmental friendliness is shown to be of unsatisfactory accuracy. Ranges of adjustment factors are proposed.

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