In relation to defence of distributive sectionalized lines with network backuping
DOI:
https://doi.org/10.31548/energiya2019.06.055Abstract
Abstract. In the article the considered problems of the use of relay defence are for distributive networks with the network backuping. Spared attention to the features of work of defence at the different modes of work of such networks, namely: normal and after to the emergency. Defence of lines with the network backuping must satisfy the general requirements of providing of necessary sensitiveness, selectivity of action at the different kinds of damages. Difficulties in providing of necessary sensitiveness at the use of maximal current defence and current pinch-offs in such networks are caused by the small level of currents of short circuit from reserve sources. The features of implementation of relay defence are resulted in the sectionalized networks at the feed of them from reserve sources.
Dependences of distributing of currents of short circuit for the highways of the sectionalized line in office hours with the power-off point of AIR and in a diet from reserve substation at the middle parameters of lengths and resistances of areas show that a current pinch-off, set on a main area, is debugged from the maximal current of short circuit after a sectionalizing point, provides defence of an approximately 67 % highway of the first area of line. A pinch-off, set on sectionalize why point, is debugged from the maximal current of short circuit on a contiguous area, provides defence only 20 % highways of line are at a feed from a basic source.
At a feed from a reserve source there are currents of short circuit on a protected area oh considerably less setpoints of current pinch-off, set on a sectionalizing point, that is why in this case a current pinch-off set on sectionalize why switches appears uneffective. Maximal current pinch-offs on the sectionalized lines with the network backuping as defence of the second degrees it is expedient to use on main areas to the line.
Key words: distributive networks, sectionalizings, relay defence, short circuit, backuping, selectivity
References
Holota, A. D. (2006). Avtomatyka v elektroenerhetychnykh systemakh [Automation in power systems]. Kyiv: Vyshcha shkola, 367.
Andriyevskiy, E. N. (1983). Sektsionirovaniye i rezervirovaniye sel’skikh elektricheskikh setey [Sectioning and reservation of rural electric networks]. Moskow:Energoatomizdat, 286.
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