This report is about relays defence end systemic automatics of Lithuania electricity network. There is analysed relays defence end systemic automatics installations work, reason of deteriorations end incorrectly coordination. Comparing difference generations relay defences and systematic automatics equipments changing of prices tendency. Summarized difference generations relay defences and systematic automatics equipments prices-quality-function possibility relation. In this research summarized Lithuanian electrical system RAA service work. One of the research purposes, establish microprocessors RAA equipments planting in electrical system possibility, on its base carrying out RAA equipments reconstruction necessity and ground this necessity on economical calculations. Collected statistical data was summarized and drawed corresponded conclusions. Analysed electrical wind power stations influence to relay defences and to optimal systematic automatics coordination.

Darbe atliktas relinės apsaugos nuo įžemėjimo atrankamo tyrimas, išnagrinėti neutralės įžeminimo režimai ir jų įtaka įžemėjimo atrankumui. Išanalizuotas apsaugų skirstymas pagal kontroliuojamą elementą. Atlikta Akcinės bendrovės „VST“ Šiaulių regione naudojamų relinės apsaugos įrenginių analizė ir funkcijų palyginimas. Ištirtos keturių tipų neteisingos relinės apsaugos nuo įžemėjimo suveiktys. Nustačius, kad įžemėjimo pažaidos metu nulinės sekos srovėje atsiranda aukštesnės eilės harmonikų atliktas bandymas, kurio metu išanalizuotas aukštesnių dažnių įtaka nulinės sekos transformatorių paklaidoms. Nustatyti dėsningumai susiję tarp dažnio ir paklaidos. Tyrimo metu išaiškintos priežastys lemiančios atrankumą įžemėjimo pažaidos metu. / The selectivity research of link protection of grounding has been done and the grounding modes of neutrality and their influence to grounding selectivity have been analyzed. Moreover, the distribution of protection under a controlling element has been studied. The research of the equipment of link protection used in the Stock Company “VST” Šiauliai region has been implemented and compared its functions. There have also been analyzed four types of effect due to wrong link protection of grounding. It was estimated that during the period of disturbance of grounding a higher line of harmonic appears in the current of null string. The experiment was implemented which estimated bias of transformers of null string by the influence of higher rates. Regularity related between rates and bias has been estimated. In addition the research explained the reasons which determines selectivity during the period of the grounding disturbance.