电力专业专业外语精选PPT.ppt

电力专业专业外语课件第1页，此课件共23页哦Chap.1 Electric Power Systemsload light,motor,heaterstation v.值守、值班Words and Expressions(B)power station,power plant 电站、电厂 base load power station 基本负荷电站（厂）peak load power station 尖峰负荷电站（厂）thermal power station 热力发电站（厂）conventional thermal power station 火力发电站（厂）第2页，此课件共23页哦Chap.1 Electric Power Systemscombined heat and power 热电联产heating power station 供热电站（厂）combined cycle power station 联合循环电站nuclear(thermal)power station 核电站（厂）Notes1.It may be water in a pond at an elevation above the generating station.第3页，此课件共23页哦Chap.1 Electric Power Systems2.The prime mover may be a steam-driven turbine,a hydraulic turbine or water wheel,or an internal combustion engine.Each one of these prime movers has the ability to convert energy in the form of heat,falling water,or fuel into rotation of a shaft,which in turn will drive the generator.第4页，此课件共23页哦Chap.1 Electric Power Systems3.The control system functions to keep the speed of the machines substantially constant and the voltage within prescribed limits,even through the load may change.第5页，此课件共23页哦Chap.1 Electric Power Systems4.To meet these load conditions,it is necessary for fuel input to change,for the prime mover input to vary,and for the torque on the shaft from the prime mover to the generator to change in order that the generator may be kept at constant speed.第6页，此课件共23页哦Chap.1 Electric Power Systems5.In a modern station,the control system is a servomechanism that senses a generator output conditions and automatically makes the necessary changes in energy input and field current to hold the electrical output within certain specifications.第7页，此课件共23页哦Chap.1 Electric Power SystemsPart 2 More Complicated System Words and Expressions(A)high voltage linetransmission line overhead lineunderground cable transformercircuit breakeroutage第8页，此课件共23页哦Chap.1 Electric Power Systemsschedule n.计划 v.排定、安排ahead of schedule 提前behind schedule 落后on schedule 准时scheduled maintenance 计划检修switch out(off)第9页，此课件共23页哦Chap.1 Electric Power SystemsWords and Expressions(B)busbar 母线（排）main busbar 工作母线reserve busbar 备用母线transfer busbar 旁路母线 rigid busbar 硬母线flexible busbar 软母线double busbar 双母线triple busbar 三母线feeder circuit-breaker 馈线断路器bus coupler circuit-breaker 母联断路器 第10页，此课件共23页哦Chap.1 Electric Power SystemsNotes1.For the same power,the higher-voltage line carries less current,has lower losses for the same wire size,and provides more stable voltage.2.Additional system load may require more power than the generator can supply.第11页，此课件共23页哦Chap.1 Electric Power Systems3.The above system may be vastly improved by the introduction of circuit breakers,which may be opened and closed as needed.4.If possible,outages of equipment are scheduled at times when load requirement are below normal.第12页，此课件共23页哦Chap.1 Electric Power SystemsPart 3 Typical System LayoutWords and Expressions(A)the radial systemthe loop system the network systeminterruption of powerto be removed from servicedistribution circuit interconnection第13页，此课件共23页哦Chap.1 Electric Power SystemsWords and Expressions(B)Electrical power system 电力系统Electrical power network 电力网Alternating current system;a.c.system 交流系统direct current system;d.c.system 直流系统 Power frequency 工频Generation of electricity 发电Transformation of electricity 变电Transmission of electricity 输电Distribution of electricity 配电Interconnection of power systems 电力系统的互联Interconnected systems 互联系统第14页，此课件共23页哦Chap.1 Electric Power Systemssystem pattern 系统连接方式system configuration 系统结构meshed system 网格系统single supply 单电源供电 duplicate supply 双电源供电stand-by supply 备用电源第15页，此课件共23页哦Chap.1 Electric Power SystemsNotes1.The generators,lines,and other equipment which form an electric system are arranged depending on the manner in which load grows in the area and may be rearranged from time to time.2.In each of these systems,a single generator serves four loads.第16页，此课件共23页哦Chap.1 Electric Power Systems3.In some instances during normal operation,the loop may be open at some point,such as A.In case a line section is to be taken out,the loop is first closed at A and then the line section removed.In this manner no service interruptions occur.第17页，此课件共23页哦Chap.1 Electric Power SystemsPart 4 Auxiliary EquipmentWords and Expressions(A)disconnect switchin series with parallel connectionto clear the fault/the removal of faulttripinstrument/potential/current transformer primary/secondary第18页，此课件共23页哦Chap.1 Electric Power Systemscapacitorshort circuit raterelaycycleratio be in phase with第19页，此课件共23页哦Chap.1 Electric Power SystemsWords and Expressions(B)active energy 有功电能reactive energy 无功电能voltage level 电压等级nominal voltage of a system 系统标称电压 operating voltage in a system 系统运行电压第20页，此课件共23页哦Chap.1 Electric Power SystemsNotes1.Circuit breakers are necessary to deenergize equipment either for normal operation or on the occurrence of short circuits.Circuit breakers must be designed to carry normal-load currents continuously,to withstand the extremaly high currents that occur during faults,and to separate contacts and clear a circuit in the presence of fault.Circuit breakers are rated in terms of these duties.第21页，此课件共23页哦Chap.1 Electric Power Systems2.These changes are most noticeable in the immediate vicinity of fault.On-line analog computers,make a determination of which breaker should be opened to clear the fault,and energize the trip circuits of those appropriate breakers.With modern equipment,the relay and breaker opening cause removal of fault within three or four cycles after its initiation.第22页，此课件共23页哦Chap.1 Electric Power Systems3.The primary of a potential transformer is connected directly to the high-voltage equipment.The secondary provides for the instruments and relays a voltage which is a constant fraction of voltage on the operating equipment and is in phase with it.Similarly,a current transformer is connected with its primary in the high-voltage circuit.The secondary winding provides a current which is a known fraction of the power-equipment current and is in phase with it.第23页，此课件共23页哦