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 an improved design for heavy-current contact systems (HCCS) with composite liquid-metal contacts (CLMC) for electrical apparatus.

It is well known that HCCS with CLMC for electrical apparatus possess a number of advantages which make development of these structures holds great potential and shows up-to-date. Among the advantages: absence of welding, vibration and electrodynamic rejection of contacts, etc. At the same time HCCS with CLMC possess some disadvantages, these being ignored may lead to serious breakdowns of electrical apparatus, especially in critical operational sectors, for instance, as operation of shunting switches at reduction areas of chemical and metallurgical industrial enterprises, where the technological procedure is constant in the course of the year with not halts with maximum rated current value aimed at maximum productivity and gain. Such disadvantages also include relatively low liquid metal solidification temperature measuring to an average of +10° C. Thus, in order for normal and failure free operation of HCCS with CLMC for electrical apparatus to be ensured, improvements are required aimed at, for one thing, start co-functioning with the electrical apparatus at an earlier stage to heat up the liquid metal to operational temperature; secondly, constantly maintain the temperature above solidification temperature level in the course of the operation of the electrical apparatus and possible deenergizing, and, in the third place, depending on the ambient air temperature, adjust and provide possibility of maintaining this temperature within the limits ensuring operational condition of the liquid metal. Besides, electronic gauges to constantly display basic values to the operators are necessary. Among such basic values are the reheat temperature of the CLMC, fixed and movable contacts, cooling liquid at input and output, voltage drop value, and others. All these items shall ensure correct and timely control of operation of the HCCS with CLMC for electrical apparatus simultaneously for compliance with several basic parameters and, thus, make operation failure-free.