Abstract
The paper analyzes the technical principles of construction and the typical structure of overhead electric grids 6-20 kV. Reliability calculations were performed for 18 segments of 6-10 kV electrical grids of one of the largest electric grid companies in the European part of the country. Shown, when assessing the reliability of overhead electric grids, it is permissible to take into account only reliability parameters of electric transmission lines. It is permissible to neglect failures of other grid elements in a first approximation (power transformers, circuit breaker e.t.c.)
Highlights
The paper analyzes the technical principles of construction and the typical structure of overhead electric grids 6-20 kV
A noticeable decrease in the failure intensity of covered overhead lines is partially offset by an increase in the mean restoration time for them, which is approximately two times higher than for uninsulated OHL
Failure intensity obtained for uninsulated and covered OHL and these values differed by more an order of magnitude from previously known values, published 30–40 years ago: 10–20–25 1/(year per 100 km) and even more [3, 4]
Summary
In publications [1, 2], the authors analyzed failure outage statistics in 6–10 kV overhead electric grids of one of the largest electric grid companies in the European part of the country to clarify the reliability characteristics of grid elements. Document [7] describes the installation requirements of sectionalizers and automatic switching device using vacuum circuit breakers in the overhead feeder line. For consumers of the 2nd category in [6], the standard failure intensity (power outages up to four hours) was approximately 2.3 1/year and for consumers of the 3rd category with a duration of power outages up to 24 hours - 3.0 1/year Based on these characteristics, the basic technical principles of 6-20 kV overhead grids and the. The grid is partitioned by automatic switching device at the point of current separation with the ability to automatic transfer switch This is done not to improve reliability, but to reduce power and electricity losses. In accordance with [8], the system average interruption frequency index (SAIFI) for consumers is defined as SAIFI= (∑I Ni)/Nt, where ∑Ni – total number of customer experienced interruption, Nt – total number
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