Improvement of ways of implementation of protecting lines of communication with substations of distributed generation sources
DOI:
https://doi.org/10.31548/energiya2019.05.107Abstract
Abstract. The article deals with the problems of using relay protection of power lines. Attention is paid to the peculiarities of the operation of protection under different modes of operation of these lines, namely: normal, post-accident and scheduled repair. The protection of two-sided power lines that connect individual local power plants to powerful electrical systems, including dispersed generation sources, local systems, and dispersed generation sources, must meet the general requirements of providing the required sensitivity, selectivity for various types of damage. Difficulties in providing the required sensitivity when using maximum current protections on such lines are associated with low levels of short-circuit currents from dispersed generation sources and local electrical systems. The features of the relay protection performance in redundant power supply of consumers using dispersed generation sources are given. The maximum operating current of the line consumed from the electrical system is 2 - 3 times the rated current, which is determined by the power of the generators of the dispersed sources of generation. In this case, the short-circuit currents from the low-power generators of the dispersed sources of generation are proportional to the maximum operating currents of the line. On double-sided power lines that connect local systems and dispersed power sources to a high-power electrical system, maximum current directional protection provides selectivity and are the main types of protection for such lines.
Key words: power supply, relay protection, reclosers, sectionalizers, distributed sources of generation, short circuit, sectioning, selectivity
References
Shabad, M. A. (2003) Raschety releynoy zashchity i avtomatiki raspredelitel’nykh setey: Monografiya [Calculations of relay protection and automation of distribution networks: Monograph]. SPb.: PEIPK, 350.
Reznichenko, T. F., Omel’chuk, A. O., Kozyrskiy, V. V. (1994). O raschete zony zashchity tokovoy otsechki [On the calculation of the current cutoff protection zone]. Energetika i elektrifikatsiya, 4, 43-44.
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