電氣設計方案論述翻譯-中英對照
6.1設計范圍
（1）廠區(qū)供配電系統(tǒng)設計
（2）廠區(qū)動力配電系統(tǒng)設計
（3）廠區(qū)構(gòu)筑物照明系統(tǒng)設計
（4）廠區(qū)構(gòu)筑物防雷與接地系統(tǒng)設計
（5）廠區(qū)電纜敷設設計
6.2廠區(qū)供配電系統(tǒng)設計
（1）供電現(xiàn)狀
主要處理污水的工廠由位于工廠南端的主提升泵旁邊的變電站的800A 入表供電。同變電站相連的原配電室供電范圍包括了用于工廠不同區(qū)域的配電盤（提升泵、循環(huán)泵、出口泵和腐殖質(zhì)泵配電盤），同時還供電至配電盤2 和污泥泵站配電盤。目前原配電室已經(jīng)沒有剩余空間。
位于揚程站配電室的配電盤2主要為行政大樓（即控制室）、污水入口設施配電盤1和車間供電，供電電纜通過混凝土制電纜溝從原配電室到配電盤2，再由配電盤2沿另外一條混凝土制電纜溝至車間和配電盤1。
（2）改造范圍
本設計對污水入口設施和污泥泵站進行擴建，原配電室主配電盤、配電盤2、配電盤1、污泥泵站配電盤都不能滿足擴建后新增負荷的供電需求，因此要對上述配電盤進行更換。主配電盤更換后安裝在變電站附近的新配電室內(nèi)；配電盤2更換后安裝在現(xiàn)有配電盤防風雨陳列柜的西面，配電盤1更換后安裝到距離新的入口設施更近的位置，配電盤均采用戶外型
，防護等級應達到IP65；污泥泵站配電盤更換后安裝在污泥泵站一個目前尚未啟用的控制室內(nèi)。
位于變電站旁的新配電室由變電站引來380V低壓電源，該配電室供電范圍包括提升泵站、循環(huán)泵站、污泥泵站、出口泵站、PLC控制柜以及配電盤2、當?shù)胤⻊张潆姳P。配電盤2由新配電室引來低壓電源，為行政大樓配電盤、污水入口設施配電盤1、車間配電盤供電。新配電室主配電盤至各分配電盤、配電盤2至各分配電盤、配電盤1至各新增用電設備、污泥泵站配電盤至各新增用電設備的電力電纜均在設計范圍內(nèi)。
（3）負荷計算
電氣負荷計算采用“需要系數(shù)法”，計算結(jié)果如下：
總有功計算功率 534.00kW；
總無功計算功率 213.92kvar；
總視在功率 575.26kVA；
總需要系數(shù) 0.75。
（4）計量方式
采用0.4kV側(cè)計量，在新配電室低壓配電柜內(nèi)裝設有功電度表和無功電度表。
（5）無功功率補償
本工程采用低壓并聯(lián)電容器自動補償，新配電室低壓開關柜低壓母線補償240kvar，補償后功率因數(shù)達到0.93以上。
（6）設備選型
低壓開關柜選用GCS型低壓抽出式開關柜或GGD型低壓固定式開關柜。
6.3廠區(qū)動力配電系統(tǒng)設計
（1）配電方式及配線
工藝設備均由新配電室低壓配電柜直接配電至控制柜控制。
設備配線采用交聯(lián)及控制電纜沿電纜溝或穿保護鋼管敷設。爆炸性氣體環(huán)境的電氣設備應選用隔爆型設備，電氣管線的敷設應滿足規(guī)范要求。入口設施配電盤1至初沉池刮泥機和污泥泵的供電線路供至用電設備附近的接線箱，接線箱至用電設備的供電線路由設備自帶；污泥泵站配電盤至消化池攪拌器、消化污泥泵的供電線路供至用電設備附近的接線箱，接線箱至用電設備的供電線路由設備自帶。
（2）電動機控制方式
全廠參與工藝過程控制的工藝設備拖動電機采用機旁就地手動控制、MCC遙控方式、遠程PLC自動控制三種控制方式。在機旁設置帶轉(zhuǎn)換開關、啟停按鈕和指示燈的按鈕箱。在電動機控制中心MCC上設置啟停按鈕及相應指示燈、電流表。在MCC上設置PLC（可編程控制器）及相應的遠程控制接口。
功率為22 kW及以上電動機采用軟啟動方式，其它小型電動機采用全壓直接啟動方式。
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