13 Basic knowledge and comprehension questions 1 1 1 1 3 4 Overview and Introduction Name up-to-date values for following reference numbers -ISKE quals how many kWhz (140 kW) anal maximum load of the publicery power system in Germany (GW - animal primary energy demand of Germany in SE 10,5 Mrd. SKEY -annual primary energy demand worldwide in SKL (0,5 Mrd. SKE) How is the ratio of primary to secondary to effective enery in Germany Explain the difference between resources, reserves and range of raw materials How high is the ratio of electrical energy to the complete energy consumption of all industrialised countries? (13%) What advantage have three-phase alternating power systems compared to two phase systems? (Nate least 2 advantages.) Why are high voltages used for electrical power transmission? Name typical values of nominal voltages of the different voltage levels in German power system What are the advantages of national and international interconnected operation? (Name at least ad vantages.) - 6 7 X 2 13 Generation of electrical energy 9 Outline the schematic structure of a conventional steam power plant 10 What is called a power unit in context of thermal power plants? Dumpferzeuger mit zugchorigem Mascal- nensatz und Transformator bzw. Maschinentransformator 11 What is the machine mit of a power plant? [Kraftwerksturbine und Generator, die ber eine gemeinsame Welle verbunden sind 12 How much coal with a mean heating value of 25 MJ/kg is needed for the getication of IkWh electrical en crgy in a power plant with an efficiency factor of 38% [379 | Explain the difficrence between a nuclear power plant and a boiling or accordingly a pressurized-water re- actor 14 What is a CCGT-plant? How high is the efficiency of such planits? 15 What is combined heat and power, CHP? What overall efficiency can be reached with such plants? 16 Name three turbines for hydroelectric power plants and the according range of application (head). Which turbine can also be used for pumping? 17 Can a wind farm with 300 MW replace a conventional power plant with the same capacity? Give reasons for your answer. 18 Name three runges that characterize the capacity and utilisation of different power plants. Assign one type of power plant to every range. 19 Sketch the characteristic load curve of daily electric power demand in Germany and devise from it the ac cording daily duration curve. 20 What is the connection between the nominal operation period 7. the utilization dumtion 7. the employment time to the nominal power P, and the maximun and mean load, Pra respectively. Perut? 3 Rotating current system 21 How is the RMS of a periodically changing parameter (t) with the oscillation time T delined? What is the connection between the RMS and the peak value of a sinusoidal parameter? 22 How is the phase difference between current and voltage detined? 23 What is the function ofa and how is it defined within the three-phase alternating power system? 24 What is the ratio of the magnitudes of the phase current in a load phase current in delta connection 1A to the Current line conductor current II.? 25 Compare Y. and delta connection of a symmetric olmic load in a three phase alternating power system: -How is the ratio of the different power inputs assuming an identical load resistance? How high does ratio of the different load resistances have to be, so that the input power will be the same! 26 How are active, reactive and apparent power defined for a two-phase power system? What are the according units of measurement? 27 With which equations can one calculate active, reactive and apparent power for asymmetrical three-phase alternating power system? 756 13 Basic knowledge and comprehension questions 1 1 1 1 3 4 Overview and Introduction Name up-to-date values for following reference numbers -ISKE quals how many kWhz (140 kW) anal maximum load of the publicery power system in Germany (GW - animal primary energy demand of Germany in SE 10,5 Mrd. SKEY -annual primary energy demand worldwide in SKL (0,5 Mrd. SKE) How is the ratio of primary to secondary to effective enery in Germany Explain the difference between resources, reserves and range of raw materials How high is the ratio of electrical energy to the complete energy consumption of all industrialised countries? (13%) What advantage have three-phase alternating power systems compared to two phase systems? (Nate least 2 advantages.) Why are high voltages used for electrical power transmission? Name typical values of nominal voltages of the different voltage levels in German power system What are the advantages of national and international interconnected operation? (Name at least ad vantages.) - 6 7 X 2 13 Generation of electrical energy 9 Outline the schematic structure of a conventional steam power plant 10 What is called a power unit in context of thermal power plants? Dumpferzeuger mit zugchorigem Mascal- nensatz und Transformator bzw. Maschinentransformator 11 What is the machine mit of a power plant? [Kraftwerksturbine und Generator, die ber eine gemeinsame Welle verbunden sind 12 How much coal with a mean heating value of 25 MJ/kg is needed for the getication of IkWh electrical en crgy in a power plant with an efficiency factor of 38% [379 | Explain the difficrence between a nuclear power plant and a boiling or accordingly a pressurized-water re- actor 14 What is a CCGT-plant? How high is the efficiency of such planits? 15 What is combined heat and power, CHP? What overall efficiency can be reached with such plants? 16 Name three turbines for hydroelectric power plants and the according range of application (head). Which turbine can also be used for pumping? 17 Can a wind farm with 300 MW replace a conventional power plant with the same capacity? Give reasons for your answer. 18 Name three runges that characterize the capacity and utilisation of different power plants. Assign one type of power plant to every range. 19 Sketch the characteristic load curve of daily electric power demand in Germany and devise from it the ac cording daily duration curve. 20 What is the connection between the nominal operation period 7. the utilization dumtion 7. the employment time to the nominal power P, and the maximun and mean load, Pra respectively. Perut? 3 Rotating current system 21 How is the RMS of a periodically changing parameter (t) with the oscillation time T delined? What is the connection between the RMS and the peak value of a sinusoidal parameter? 22 How is the phase difference between current and voltage detined? 23 What is the function ofa and how is it defined within the three-phase alternating power system? 24 What is the ratio of the magnitudes of the phase current in a load phase current in delta connection 1A to the Current line conductor current II.? 25 Compare Y. and delta connection of a symmetric olmic load in a three phase alternating power system: -How is the ratio of the different power inputs assuming an identical load resistance? How high does ratio of the different load resistances have to be, so that the input power will be the same! 26 How are active, reactive and apparent power defined for a two-phase power system? What are the according units of measurement? 27 With which equations can one calculate active, reactive and apparent power for asymmetrical three-phase alternating power system? 756