EURO-ECO 2008 Hanover 18 - 20 November 2008	Environmental and Engineering Aspects for sustainable living
	European Academy of Natural Sciences, Hanover European Scientific Society, Hanover University of Bremen, Bremen

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The purpose of the present work lies in working out new designs of high-current contact systems (HCCS) with composite liquid-metal contacts (CLMC) for electric devices.

It is known, that CLMCs possess a great number of advantages:

• operational life – 3000-5000 and even more switch on/switch off operations (on-off );
• 100 % silver save;
• liquid metal save;
• minimum transitive electric resistance,
• minimum losses of electric power,
• minimum pressure force,
• absence of electrodynamic kickback forces,
• absence of such phenomena, as welding overå, vibration and contacts sticking;
• increase in inclination angle relative to horizon does not influences the CLMC resistance greatly;
• easy to use in conjunction with existing electric devices;
• easy to operate and maintain;

Therefore, the problem of working out new designs of HCCS with CLMC for modern electric devices is of especially great importance. In the given work the designs of Shalaginov’s HCCSs No. 9 and 10 are presented. These designs of HCCSs have been made to increase rated current value, to reduce surface resistance, to improve reliability, to simplify the design and to increase operational life. Thus, the use of contacting element of composite structure (made of conductor and non-conductor) in HCCS No. 9 has allowed for reducing drive mechanism weight i.e. making it lighter and more durable, accordingly, as well as increasing reliability of switch operation. In HCCS No 10 changes made in the design of contacting element due to the increase of its diameter at a distance equal to a half of the distance between the bottom and top sealing bushes, made it possible to reduce distance between lateral surface of the contacting element and internal cavity of the top fixed contact as well as to fill space between them with liquid metal. As a result, electrical connection has been considerably improved, surface electric resistance has been decreased and electric power losses have been decreased as well. The use of contacting element of composite structure in HCCS No 10 has provided the same advantages, as in the case with HCCS No. 9.

Based on the results of conducted researches, the present HCCSs with CLMCs can be recommended for use in electric devices applied in chemical, metallurgical and a number of other industries.