电气设计方案论述翻译-中英对照
6.1设计范围
（1）厂区供配电系统设计
（2）厂区动力配电系统设计
（3）厂区构筑物照明系统设计
（4）厂区构筑物防雷与接地系统设计
（5）厂区电缆敷设设计
6.2厂区供配电系统设计
（1）供电现状
主要处理污水的工厂由位于工厂南端的主提升泵旁边的变电站的800A 入表供电。同变电站相连的原配电室供电范围包括了用于工厂不同区域的配电盘（提升泵、循环泵、出口泵和腐殖质泵配电盘），同时还供电至配电盘2 和污泥泵站配电盘。目前原配电室已经没有剩余空间。
位于扬程站配电室的配电盘2主要为行政大楼（即控制室）、污水入口设施配电盘1和车间供电，供电电缆通过混凝土制电缆沟从原配电室到配电盘2，再由配电盘2沿另外一条混凝土制电缆沟至车间和配电盘1。
（2）改造范围
本设计对污水入口设施和污泥泵站进行扩建，原配电室主配电盘、配电盘2、配电盘1、污泥泵站配电盘都不能满足扩建后新增负荷的供电需求，因此要对上述配电盘进行更换。主配电盘更换后安装在变电站附近的新配电室内；配电盘2更换后安装在现有配电盘防风雨陈列柜的西面，配电盘1更换后安装到距离新的入口设施更近的位置，配电盘均采用户外型
，防护等级应达到IP65；污泥泵站配电盘更换后安装在污泥泵站一个目前尚未启用的控制室内。
位于变电站旁的新配电室由变电站引来380V低压电源，该配电室供电范围包括提升泵站、循环泵站、污泥泵站、出口泵站、PLC控制柜以及配电盘2、当地服务配电盘。配电盘2由新配电室引来低压电源，为行政大楼配电盘、污水入口设施配电盘1、车间配电盘供电。新配电室主配电盘至各分配电盘、配电盘2至各分配电盘、配电盘1至各新增用电设备、污泥泵站配电盘至各新增用电设备的电力电缆均在设计范围内。
（3）负荷计算
电气负荷计算采用“需要系数法”，计算结果如下：
总有功计算功率 534.00kW；
总无功计算功率 213.92kvar；
总视在功率 575.26kVA；
总需要系数 0.75。
（4）计量方式
采用0.4kV侧计量，在新配电室低压配电柜内装设有功电度表和无功电度表。
（5）无功功率补偿
本工程采用低压并联电容器自动补偿，新配电室低压开关柜低压母线补偿240kvar，补偿后功率因数达到0.93以上。
（6）设备选型
低压开关柜选用GCS型低压抽出式开关柜或GGD型低压固定式开关柜。
6.3厂区动力配电系统设计
（1）配电方式及配线
工艺设备均由新配电室低压配电柜直接配电至控制柜控制。
设备配线采用交联及控制电缆沿电缆沟或穿保护钢管敷设。爆炸性气体环境的电气设备应选用隔爆型设备，电气管线的敷设应满足规范要求。入口设施配电盘1至初沉池刮泥机和污泥泵的供电线路供至用电设备附近的接线箱，接线箱至用电设备的供电线路由设备自带；污泥泵站配电盘至消化池搅拌器、消化污泥泵的供电线路供至用电设备附近的接线箱，接线箱至用电设备的供电线路由设备自带。
（2）电动机控制方式
全厂参与工艺过程控制的工艺设备拖动电机采用机旁就地手动控制、MCC遥控方式、远程PLC自动控制三种控制方式。在机旁设置带转换开关、启停按钮和指示灯的按钮箱。在电动机控制中心MCC上设置启停按钮及相应指示灯、电流表。在MCC上设置PLC（可编程控制器）及相应的远程控制接口。
功率为22 kW及以上电动机采用软启动方式，其它小型电动机采用全压直接启动方式。
6 Program description of electricity design
6. 1 Scope of design
(1) On-site design of power supply and electrical distribution system of factory district the design
(2) On-site design of power distribution system
(3) On-site design of construction lighting system
(4) On-site design of construction lightning protection and ground system
(5) On-site design of cabling;
6. 2 On-site design of power supply and electrical distribution system
(1) Present situation of power supply
The main sewage treatment plant is located in the south area of the main lifting pump which is nearby the transformer substation and provides with 800A power supply. The power supply scope of original power distribution room connected with transformer substation includes the distributors used in the different region of the plant (lift pump, circulating pump, export pump and humus pump distributor). Meanwhile, it also supplies the power to the distributor 2 and the distributor of sludge pumping station. At present, the original power distribution room did not have any surplus space.
The distributor 2 located in the power distribution room of lifting station mainly includes administrative building (namely, control room), distributor 1 of sewage inlet facilities and workshop power supply. The cable of power supply is arranged through the concrete cable trench from the original power distribution room to distributor 2, and then paved along the other concrete cable trench to workshop and distributor 1 from distributor 2.
(2) Scope of reconstruction
This design is plan to implement the extension project to the sewage inlet facilities and the sludge pumping station. The main distributor of the original distribution room, distributor 2, distributor 1 and the distributor of sludge pumping station shall not meet the requirements of the increased loading of power supply after extension. Therefore, it is required to replace the distributor mentioned above. After the replacement of main distributor it shall be installed nearby the transformer substation in the new power distribution room; after the replacement of distributor 2 it shall be installed in the west side of weather-proof display stand of current distributor; after the replacement of distributor 1 it shall be installed in the position closer to new inlet facilities. The distributors apply the outdoor type. The protection level shall be IP65; after the replacement of the distributor of sludge pumping station is shall be installed in the control room not yet begins to use at present inside the sludge pumping station.
The new power distribution room located nearby the transformer substation is supplied by 380V low pressure power source from the transformer substation. The power supply scope of this distribution room includes lift pumping station, circulation pumping station, sludge pumping station, export pumping station, PLC control cabinet, distributor 2 and local service distributor. The distributor 2 is supplied by the low pressure power source from new distribution room, which is supplied for administrative building distributor, distributor 1 of sewage inlet facilities and power supply of the distributor in workshop. The additional power cable from main distributor of new power distribution room to each sub-distributors, distributor 2 to each sub-distributors, distributor 1 to each newly increased electricity utilization facilities, distributor of sludge pumping station to each newly increased electricity utilization facilities are included in the design scope.
(3) Loading calculation
The calculation of electricity loading applies “Demanding coefficient method”, the calculating result is as follows:
Total active power: 534. 00kW;
Total reactive power: 213. 92kvar;
Total apparent power: 575. 26kVA;
Total demand coefficient: 0. 75.
(4) Calculating method
Applies the 0.4kV side measurement; the active electric meter and reactive electric meter shall be arranged in the low pressure power distribution cabinet of newly increased power distributor room.
(5) Reactive power compensation
This project applies the automatic compensation of low pressure parallel capacitor; the low pressure bus compensation of low pressure switch cabinet of new distribution room is about 240kvar; the power coefficient after compensation shall be 0. 93 above;
(6) Equipments option
The low pressure switch cabinet selects the GCS low pressure extracting type switch cabinet or GGD low pressure stationary type switch cabinet.
6. 3 Design of on-site electricity power distribution system
(1) Power distribution method and wiring
The processing units shall directly access to the controlling cabinet for controlling from the low pressure power distribution cabinet of new distribution room.
The equipment wiring applies the cross linking method and arranges the cable along the cable trench or protecting steel pipe for laying. The electrical equipments in explosive gas atmosphere shall select flame-proof type equipments. The electricity pipeline laying shall meet with the requirements of relevant regulation.
The supply line from distributor 1 of inlet facilities to sludge removal unit of primary sediment tank and the sludge pump shall be connected to the wiring box nearby electricity utilization units; the supply line from the wiring box to the electricity utilization units shall be fixed on the equipments; the supply line from distributor of sludge pumping station to the mixer of digesting tank and digesting sludge pump shall be connected to the wiring box nearby electricity utilization units; the supply line from the wiring box to the electricity utilization units shall be fixed on the equipments;
(2) Motor controlling method
The total on-site dragging motor of processing units participated in the process controlling procedure applies three control modes of local manual control, MCC remote control and long-distance PLC automatic control. The change-over switch, open stop button and the button box of indicating lamp shall be arranged near the unit. It is required to arrange the opens stops the button and the corresponding indicating lamp on the motor control center MCC and ampere meter. PLC and the corresponding long-distance control interface shall be arranged on MCC (programmable controller).
The motor with power above 22 kW may select the soft start method, and the other micro motors may select the total pressure direct start method.
2013.7.1