Richard Modlinger

Richard Modlinger (1966)

Richard Franz Joseph Modlinger (born June 18, 1911 in Munich ; † March 2, 2000 in Grünwald near Munich) was a German engineer and scientist.

Life

Richard Modlinger was born as the son of the master and technician Josef Modlinger and his wife Maria (née Wolz). Josef Modlinger was the technical manager for the construction of the Middle Isar canal at the Unterföhring building yard near Munich. After graduating from high school in Munich, Richard Modlinger studied electrical engineering at the Technical University of Munich (today: Technical University of Munich ). His academic teachers included a. Professors Walther von Dyck, Walther Kaufmann, Paul von Lossow, Johann Ossanna , Christian Prinz, Dieter Thoma, Jonathan Zenneck . He completed his studies in 1935 as the best THM graduate of this year with the grade "passed with distinction". As a result of the war years, Richard Modlinger received his doctorate at the THM (reporters: Professors Walter Seiz and Hans Prinz , the latter son of the aforementioned professor Christian Prinz) as Dr.-Ing. with the dissertation "The automatic voltage regulation of synchronous generators with the help of grid- controlled rectifiers " only on June 30, 1949. The principle described there is still in use today.

His professional life began from 1936 to 1938 as a research assistant at the AEG Research Institute in Berlin. Subsequently, from 1938 to 1968 he worked as a specialist for electrical machines and controls in energy supply (Reichselektrowerke, Bayernwerk , experimental nuclear power plant Kahl / Main and Stadtwerke München ). Including in the first years as an expert for the hydrogenation plant Dessau-Roßlau - later also as the technical manager of a measuring instrument factory. He also carried out studies on British and French energy supplies. From 1952 to 1980 Richard Modlinger was a publicly appointed and sworn expert for electrical engineering, energy supply and the energy industry by the government of Upper Bavaria. From 1973 to 1980 he was an Expert on Energy Surveys at ECAFE ( Economic Commission for Asia and the Far East , United Nations ). In this context, he worked as a consultant in Thailand, Indonesia, Sumatra, Papua New Guinea and Afghanistan. He created u. a. the national energy planning for Afghanistan within the framework of a UN program - among other things, he was responsible for checking the feasibility study for Afghanistan “city network expansion Kabul IV”. He was later commissioned to review a paper on the planning of the electricity supply of Colombia in the program of technical cooperation between the federal government and Colombia.

In 1944 Richard Modlinger married the draftsman, painter and author Magda Roos . He got to know them while working as an energy engineer for the aircraft engine test benches of the BMW plants in Munich (Milbertshofen and Allach). In 1945 the son Andreas was born, who continues the family tradition as an electrical engineer and expert. Richard Modlinger had three more children with his second wife, whom he married after the divorce in 1958.

activity

In 1936 Richard Modlinger was involved in the construction of the first rectifier excitation system for a 15 kVA test generator at the AEG Berlin research institute. In 1939, with his help, the first use of a turbo generator disconnected from the turbine for phase shifter operation followed. In the following year he worked on theory and machine problems of the first high-voltage direct current transmission (HVDC) Berlin-Dessau (Elbe power station). In 1944 he was entrusted with the planning of an aircraft engine brake stand using a three-phase commutator generator to generate the braking energy for the power supply of a BMW aircraft engine plant .

In 1952 Richard Modlinger headed the first use of hydrogen-cooled turbo-generators for a German steam power plant and had extensive influence on the construction of the hydrogen plant and the shaft seals. The construction of a rectifier excitation system for large turbo generators (60 MVA), which he designed, followed in 1953. Against the background of the development towards ever higher performance according to the principle "the better the heat dissipation, the more efficient", he carried out scientific investigations in the following year in connection with measurements of the temporal changes of the rod temperatures in the squirrel cage of large asynchronous motors during a heavy start .

Richard Modlinger dealt with investigations into the use of large three-phase commutator motors for the speed-controlled drive of fans and operation up to top synchronism (plus 15%). In 1956 he introduced the use of a frequency-controlled network to feed asynchronous motors to drive coal distributors . In the following year he undertook extensive investigations into the stability and operation of underexcited turbo generators in the network. In 1958, he broke new scientific ground with investigations into the connection of unexcited turbo generators (60 MVA) in synchronism and sub-synchronism with the German energy supply network .

Patents and developments

His patents include thermal overload protection for electrical machines, devices and systems or parts of these systems, the shaft seal for the gas-tight closure of rotating machines, and the arrangement to improve the partial load efficiency of electrical machines with increased hydrogen cooling. In addition, a safety device for oil seals with an axial sealing ring, an arrangement for exciting large synchronous generators with the help of a shaft generator, an arrangement to increase the stability of a synchronous machine and a start-up monitoring for commutator motors. Furthermore, the device for measuring the rotor angle of synchronous generators, the independent reactive power control of electrical machines in the network and the controller with electronic or mechanical scanning.

Cooperations

Richard Modlinger worked with the electrical companies AEG , Siemens , BBC and Schorch as part of his professional activity . Partners included Eugen Wiedemann and Hans Happoldt (both BBC). The latter's work, "Electrical Power Plants and Networks", contains a reference to Richard Modlinger. He was also particularly involved in the VDEW (Association of German Electricity Works, Frankfurt / Main - today BDEW ) in the working groups: “Additional delivery agreements for electric motors”, “Power plant auxiliary machines”, “Technical delivery conditions for steam turbo sets (revision of the so-called white delivery conditions ) "," Generators "and" Steam Turbines ". He was also a member of VDE , VDI , cigré and the Deutsches Museum in Munich. The latter keeps a photo documentation of the power plants managed by Richard Modlinger.

Publications

• Generation of electrical energy from aircraft engine test benches. In: ETZ. 1944, p. 73.
• Generation of electrical energy from aircraft engine test benches. In: Luftwissen. 1944, p. 49.
• Repairing moisture damage in electrical machines. In: Electrical engineering. Vol. 2, No. 2, 1948.
• Commutation in three-phase collector machines. In: Electrical engineering. Vol. 2, No. 6, 1948.
• The most important electric motor drives in a steam power plant. In: ETZ. 70th year, issue 1, 1949.
• Temperature measurements in electrical machines. In: Electrical engineering. Vol. 3, No. 3/4, 1949.
• The development of electrical engineering in England. In: Electrical engineering. Vol. 3, No. 8, 1949.
• Ignition systems of gasoline engines. In: Motor and Gas Turbine. 1949, p. 51.
• Temperature measurements on electrical machines. In: The electrical engineer. 2nd year, issue 4, 1950.
• The use of silicone resins for insulation in electrical machines. In: ETZ. 71st year, issue 19, 1950.
• Dependency of the reactive power presentation on the design of the power generator units with changing mains voltage. In: ETZ. 71st year, 1950, p. 479.
• American mercury steam power plants. In: The electrical engineer. 4th year, issue 2, 1950.
• The use of turbo generators as reactive power machines. In: ETZ. 74th year, 1953, p. 43.
• The automatic voltage regulation of synchronous generators by means of grid-controlled rectifiers. In: ETZ. 75th year, 1954, p. 273.
• Basics for the hydrogen cooling of turbo generators. In: ETZ-A. Vol. 75, Issue 14, 1954, pp. 476-478.
• Systems with hydrogen-cooled turbo generators. In: ETZ-A. Vol. 75, Issue 16, 1954, pp. 520-526.
• Economic considerations about the importance of underperformance in the delivery of large systems, especially for energy supply. In: Electricity Industry. Vol. 54, Issue 9, pp. 283-287.
• Drying electrical machines. In: Electricity Industry. 55th year, issue 21, pp. 758-761.
• Via the drive of fans for large boiler systems. In: Electricity Industry. 55th year, issue 24, pp. 896-900.
• The regulation of coal allocation with the help of its own regulated network. In: fuel-heat-power. Vol. 9, Issue 9, 1957, pp. 405-408.
• Measuring devices for assessing the stability of synchronous machines in the underexcited state (pole wheel angle measuring devices). In: Journées Internationales d'Etude des Centrales Thermiques et Hydrauliques Modernes. Liege 1958.
• By switching unexcited synchronous generators. In: ETZ-A. Vol. 80, Issue 1, 1959, pp. 12-14.
• The automatic reactive power control in the network. In: Electricity Industry. Vol. 59, Issue 5, 1960, pp. 124-127.
• Project study for the expansion of the Leitzach power plant. In: The water industry. 59th year, issue 6, 1969.
• Sumatran river offers base for tri-nation grid. In: Energy International.

swell

• Richard Modlinger: The automatic voltage regulation of synchronous generators with the help of grid-controlled rectifiers . TH Munich 1948, DNB 480242984 .
• Patent US2195116 : Electric valve system. Published March 26, 1940 . ‌
• Patent US2279053 : Electric measuring instrument. Published April 7, 1942 . ‌
• Buchhold, Happoldt: Electrical power plants and networks . 4th edition, Springer, Berlin / Göttingen / Heidelberg 1963, LCCN  63-019385 .
• Richard Modlinger Collection on Power Plant Construction and Energy Supply, approx. 1953–1975 . In: ARCHIVE-info . 6th year, issue No. 2, 2005 ( PDF ).

Web links

• Various other patents registered with the German Patent Office at: https://depatisnet.dpma.de/DepatisNet