W artykule przedstawiono analizę przydatności metody symulowanego obciążenia transformatorów do badania nagrzewania stacji transformatorowych górniczych. Porównano zjawiska związane z wydzielaniem ciepła w stacjach transformatorowych, badanych w warunkach zasilania i obciążenia zbliżonych do warunków pracy znamionowej oraz w stacjach badanych metodą symulowanego obciążenia. Wskazano na potrzebę opracowania zastępczej metody badawczej nagrzewania stacji transformatorowych o dużych mocach znamionowych, gdy badanie metodą bezpośredniego obciążenia jest technicznie niemożliwe lub nieuzasadnione z przyczyn ekonomicznych.
EN
The paper concerns the methodology of testing transformer stations dedicated to be used in underground mines. The method of simulated loading currently used for testing temperature rise of transformer stations has been shown as inaccurate on the basis of experience and analysis of relevant standards, because it does not give the reliable value of temperature rise of components and air inside the station under test. This method may be used for testing temperature rise of transformer coils in a single transformer but not for transformer stations which are compound devices, assembled from many components. The result obtained by means of using the method of simulated loading is useless, because it does not concern all components of the station with the exception of the transformer coils. A transformer station tested this way may be dangerous because the method does not reveal important occurrences, influencing its failure-free and harmless work, for example the temperature of air around electrical protections. The paper also depicts the possibility of dangerous occurrences’ appearance such as an initiation of arc fault caused by overheating electric insulation. It has been underlined that the test measuring temperature rises must be conducted in conditions nearest to the rated working station. There has been stated that the use of the method is allowed on condition its successful validation. It has been pointed out that reliable substitutable method of testing high voltage transformer stations’ temperature rise must be obtained and used in cases where the method of direct loading is difficult to conduct or economically unjustified.
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W artykule przedstawiono budowę, zasadę działania oraz opisy obwodów zasilania, sterowania, zabezpieczeń oraz automatyki przekształtnikowego prostownika górniczego typu: NTP 54A 250/6/0,25DC. Prostownik NTP 54A 250/6/0,25DC posiada nowoczesną budowę kompaktową oraz zakresy parametrów eksploatacyjnych znacznie rozszerzone w stosunku do tradycyjnych rozwiązań zasilaczy trakcyjnych: APSP, APST. Nowoczesne układy sterowania, monitoring oraz wizualizacja parametrów eksploatacyjnych, sygnalizacja stanów awaryjnych – zwiększają pewność i niezawodność pracy prostownika oraz bezpieczeństwo eksploatacji transportu szynowego z trakcją przewodową. W artykule przedstawiono przykładowe algorytmy sterowania prostownika oraz wyniki badań laboratoryjnych i eksploatacyjnych prostownika. Prostownik przekształtnikowy był testowany w kopalniach węgla kamiennego oraz pracuje bezawaryjnie od roku w jednej z KWK.
EN
In the paper presented construction, rule of activity and description of circuits: power supply circuits, control circuits and protection and automation circuits of the mine rectifier type NTP 54A 250/6/0,25DC. The rectifier NTP 54A 250/6/0,25DC possesses modern compact construction and ranges of exploitive parameters considerably extended with relation to of traditional solutions of traction suppliers: APSP, APST. Modern control systems, monitoring and visualization of exploitive parameters , detection of damage states, enlarged the certainty and the reliability of rectifier work, and exploitation safety of rail transport with the line traction. In the article introduced an example-algorithms of rectifier control, and results of laboratory and exploitive experiments of the rectifier. The rectifier converter was tested in underground mines, and. has worked failure-freely through the period of one year in different operating conditions.
In the paper described construction, work system and selected circuits: supply system, control and diagnostic system of the mine converter type NTP 54A 250/6/0,25DC. Control and diagnostic system cooperate with microprocessor controller. Converter NTP 54A 250/6/0,25DC have a modern compact construction. Converter construction contain a system of chambers separated apart with thermal isolation about the degree protection IP 54, the closed cooling system with the air inside chambers of the rectifier without external filters. In chambers "6kV" of the rectifier one used barriers of gas-the blast making possible relaxation of gases from the arched short-circuit inside chambers of the rectifier. The application of the rectifier NTP 54A 250/6/0,25DC in the supply system of the line-traction should cause the considerable improvement of the work safety, diminish the number of damages of line-motors by the improvement of the efficiency of getting down to work of protections of the rectifier. In the article one introduced example-algorithms of the control of the rectifier, and findings of laboratory and exploitive of the rectifier. Proposing solution of the system of the power supply of the line-traction makes possible the running inspection of exploitive parameters, and visualization and the diagnostics of states of the computer run supplied of the line-electric traction. The rectifier was tested in several mines of the pit-coal, and worked failure-freely through the period of 2 months in different operating conditions.
In the paper presented descriptions of control protections and diagnostics circuits of the mining converter rectifier type: NTP 54A 250/6/0,25DC. One described of control procedures of thyristor rectifier in normal operating conditions and in damage states, during galvanic short-circuits and "short rail" of the trolley wire with the rail. In paper introduced results of laboratory and industrial investigations of the mine rectifier for typical bootable tests exploitive normal and for states of the damage (the short-circuit, short rail) work conditions. Exploitaition investigations were realized on two mines: The Katowice Coal-Holding Company: Mine Murcki-Staszic, and the Coal-Company S.A.: Mine Ziemowit. Results of exploitive confirmed the rightness of worked out procedures control system and diagnostics procedures of mine rectifier.
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