EURO-ECO 2007 Hanover 4 - 5 December 2007	Environmental and Engineering Aspects for sustainable living
	European Academy of Natural Sciences, Hanover European Scientific Society, Hanover Russian Academy of Natural Sciences, Moscow

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Shalaginov A.A.

The aim of the present study is the development of new designs for heavy-current contact systems (HCCS) with composite liquid-metal contacts (CLMC) for electrical apparatus.

It is well known, that CLMC possess a whole suite of advantages:

• Operational lifetime 3000 – 5000 switch on/off operations (ON – OFF) and more;

• 100% savings on silver;

• Savings on liquid metal;

• Minimum transient resistance;

• Minimum electrical power loss;

• Minimum press force;

• Absence of electrodynamic reject forces;

• Absence of such phenomena, as welding, vibration and sealing of contacts;

• Increased pitch to horizon poorly influences the CLMC resistance;

• Possibility to easily associate with the existing electrical apparatus;

• Easy operation and repair maintenance;

Because of the above, the task of developing new design of HCCS with CLMC for modern electrical apparatus appears to be of high priority. Shalaginov’s designs of HCCS Nos. 4 – 7 are presented in the present study. These HCCS designs were developed to ensure further increase in rated current value, decrease of transient resistance, growing reliability, simplified design and longer operational lifetime. In this regard, the electrical contact between the side surfaces of the inner cavities of the fixed bridge and the contact element in these systems is performed in different ways: For HCCS No. 2 this is realized by means of roller contacts and for HCCS No. 5 – via liquid metal, for HCCS No. 6 – by means of flexible metallic bonding, for HCCS No. 7 – by means of flexible metallic bonding and a pressure arrangement, located at a similar side.

Based on the results of the research accomplished these designs of HCCS with CLMC may be recommended for application in electrical apparatus, specified for chemical industry, metallurgy and other segments of industry.