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公共线
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  “公共线”译为未确定词的双语例句
     However, a third circuit relay can be used on common lines in order to improve the sensitivity.
     而采用不完全星形接线 ,在某两相发生相间短路时 ,保护装置的灵敏度将减小一半 ,但可采取在其公共线上接入第三个电流断电器的方法提高其灵敏度 .
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     PLC control is to be applied to the modular machine tool of Model JB domestic sewing machine. The machine tool has many input points,but the number of them can be increased by PLC which adopts the way of the transfer of input public ends. The input points for normal controlled of the machine tool lie on one common line, and input points of the jog motions can be transfered to another common line by a transfer switch.
     对JB型家用缝纫机机加工组合机床实施PLC控制 ,因机床的输入点较多 ,对PLC采用了输入公共端切换的方法来扩充输入点数 ,机床正常控制的输入点置于一条公共线上 ,机床点动调整控制的输入点通过组合开关切换到另一条公共线上。
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     ONLINE
     在线
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     A Model for the Urban Transit Network Optimization and Evaluation
     城市公共交通车线网络优化模型
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     TECHNOLOGY ON LINE
     成果在线
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     Public Relations
     公共关系
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     Network Scheme of the Public Transport in Beijing
     北京市公共电、汽车线网系统规划
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  concentration line
Distance from Point Barrow northward to the 4/8th ice concentration line on 15 September.
      
It is seen that the velocity field is symmetric about the maximum concentration line.
      
ResidualCurves calculates the concentration line of a three-component open evaporation.
      
This program calculates the concentration line of a three-component open evaporation.
      
Thermophoretic samplings were performed at several axial locations ranging from 2.5 to 45 mm along the annulus of the maximum soot concentration line.
      


DCS operation will be effected by RFI from radio communication equipment, misgrounding and inappropriate power supply system. The experiment of RFI interference to the DCS system and instruments conducted by Kramayi Refinery showed that the RFI interference could lead to the loss of data which resulted in the interruption of the DCS operation, causing the unexpected plant shutdown. The preventive measure is to strengthen the management and keep the interference source equipment far away from the DCS system....

DCS operation will be effected by RFI from radio communication equipment, misgrounding and inappropriate power supply system. The experiment of RFI interference to the DCS system and instruments conducted by Kramayi Refinery showed that the RFI interference could lead to the loss of data which resulted in the interruption of the DCS operation, causing the unexpected plant shutdown. The preventive measure is to strengthen the management and keep the interference source equipment far away from the DCS system. The grounding interference should be taken into consideration in the design of the protection grounding system. The requirements of explosion proof and antiinterference of the instruments should be met while the potential should be balanced. The DCS safe grounding should be connected to the overall plant grounding system. An independent DCS POwer grounding is practiced only when the overall plant grounding system can not meet the requirements. The DCS power grounding should be: when three- phase and four-wire system is adopted, the neutral wire should be grounded; when single-phase system is adopted and if the DCS system is connected to the overall plant grounding system, the zero wire of the DCS should not be grounded. If the DCS has an independent grounding system , the zero wire should be grounded. That when Master Reference Grounding (MRG) is 4 ~ 5 ohm, the grounding resistance is 5 ohm, or when MRG is 1 ohm, the grounding resistance is 4 ~ 5 ohm is misconception. The good MRG of DCS should be: for non-common line single system, the MRG is 5 ohm; when diode safety barriers are used, the MRG should be higher than that of the protection grounding. Multipoint grounding should be avoided. The UPS shall be provided with automatic back power switching system. The charger and inverter should be configured redundantly to assure the safe operation of DCS system.

使用无线通讯设备,不正确接地及电源系统配置的不完善,均会影响DCS的安全运行。克拉玛依炼油厂进行的对讲机对仪表和DCS的干扰实验表明,干扰严重者会导致DCS数据丢失,退出运行程序,引起设备误停车。其预防措施是加强管理,使干扰设施远离DCS。在设置接地体时应防止由保护接地引起的干扰,既要满足仪表防爆和抑制干扰的要求,又要达到电位平衡的目的,一般应与全厂统一接地网连在一起,仅在统一接地网不能满足要求时才独立接地。DCS的电源接地采用三相四线制时,输出中线应接地;而采用单相电源时,若DCS与电力设备为公用接地,则 DCS电源零线不接地;若 DCS采用独立接地,DCS电源零线应接地。将工作接地电阻一概定为 4Ω ,保护接地电阻5Ω,或工作接地电阻1Ω,保护接地电阻4~5Ω,均是一种误区,应区别对待。对不需要公共线的系统,接地电阻5Ω,采用二极管安全栅时,工作接地电阻应高于保护接地电阻,同时要避免多点接地。 UPS应有主备电源切换,UPS内的充电器和逆变器应冗余配置,性能参数应满足DCS的要求。

Analyzing power measurement device for mistake wiring using hexangular dia-gram,two -terminal net work and superosition theorem method.The witers calculated power number depending on mistake wiring situation and function of power addition.

对实践中电能计量故障接线一例(公共线断路)采用六角图法及二端网络叠加法进行分析,并根据错误接线情况与电量追加公式计算出追加电量数。

The sensitivity is analysed and discussed during two phase short circuit, after Y,d11 transformer,of relays on three phase complete star connection and two phase incomplete star connection.For complete star connection, the sensitivity of protection device is high when any two phase short circuit happens, while for incomplete star connection, the sensityvity is deducted by half. However, a third circuit relay can be used on common lines in order to improve the sensitivity.

就三相三继电器完全星形接线与两相两继电器的不完全星形接线在Y ,d11接线变压器后发生两相短路时的灵敏度进行了分析与探讨 .若采用完全星形接线 ,在任何两相发生相间短路时 ,保护装置的灵敏度均较高 ;而采用不完全星形接线 ,在某两相发生相间短路时 ,保护装置的灵敏度将减小一半 ,但可采取在其公共线上接入第三个电流断电器的方法提高其灵敏度 .

 
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