恩泽托400kv变电站

The220kV will be double busbars with transfer busbar and the 60kV, double busbars.
220kV采用双母线带旁路接线，60kV采用双母线接线。
See theattachedSINGLE LINE DIAGRAMfor details.
架空避雷网由避雷线和避雷针双重方案来实现。所有架构立柱上方设立避雷柱，用于架设避雷线。另外避雷柱上安装避雷针，用于防直击雷。
The underground grounding screen consists of crisscrossed tin-coated copper strandswith the mesh length of 15m and buried depth of 0.8m. The vertical grounding will be considered for reducing the earthing resistance.地下接地网由纵横交错的镀锡铜绞线组成，网格尺寸15米，埋深0.8米。并考虑垂直接地极用于降低接地电阻。
All the grounding mesh will be laid down under the foundation of the substation building and will be led into the room from all the directions. All the electrical equipment and embedded pipes and members will be grounded in line with the grounding requirement.整个接地网敷设在变电楼基础下，再由四周引入室内。户内所有电气设备及其埋管、埋件均按接地要求进行接地。
3.2.7Illumination照明
The lighting for the outdoor switchgear will be provided on the building or equipment foundation of the substation. The lamps will be used for the gate and surroundings of the control building. The lighting circuit and cable will be connected with the lights by the switchboard and the lighting circuit will be led out from the AC switchgear of the control building.
The400kV autotransformer will be arranged in the south of the400kV switchgear area;
400kV自耦变压器布置在400kV配电装置区南侧；
The220kV outdoor switchgear will be arranged in the east of the substation with the lines outgoing to the south;220kV户外配电装置布置在变电站东侧，向南方向出线。
Anew 400kVsubstation will be constructed.The system wiring diagram ofN’zeto400kVSubstation is shown as below:本工程新建400kV变电站，N’zeto400kV变电站系统接线图如下：
Figure 3.1System wiring diagram of N’zeto400kV SubstationN’zeto400kV变电站系统接线图
根据业主文件《ET-N- ET- N -003 - Ed.1变电站、开关站和隔离站架空电缆和地下电缆的接地电网》的要求，本工程防雷接地包括架空防雷网和地下接地网两部分。
The overhead lightning net can be realized by lightning conductor and lightning arrester.The lightning rods will be provided above all the frames for erecting the lightning conductors. Besides, the lightning arresters will be provided on the lightning rods to prevent direct lightning stroke.
60kV户外配电装置布置在北侧，向北方向出线；
See the attached- GENERAL ELECTRICAL LAYOUTfor details.
具体布置请详见附图-GENERAL ELECTRICAL LAYOUT。
3.2.6Grounding for lightning防雷接地
According to theET-N- ET- N -003 - Ed.1Grounding Screen for Overhead Cable and Underground Cable for Substation, Switching Substation and Isolating Substation by the employer, the lightning grounding for this project will include overhead lightning net and underground grounding screen.
3.2.3 Main electrical wiring电气主接线
One and a half circuit breaker wiring will be employed for 400kV bays. Twooutgoing lines fromSoyo substationand to Kapary substation and one incoming line to transformer banks (4 units) will be constructed with two complete strings and one incomplete string. 400kV线路采用1个半断路器接线。2回出线从Soyo变电站至Kapary变电站，1回进线至变压器组（4组），2个完整串，1个不完整串。
3. N’zeto400/220/60kVSubstationN’zeto400/220/60kV变电站
3.1 General项目概况
TheN’zeto400kVSubstation is located innearby N’zeto cityof Angola. The city has the average annual air temperature of 22℃.N’zeto400kV变电站坐落在安哥拉的N’zeto附近，年平均温度22℃。
1台220/60/15kV三相电力变压器，每台容量为63MVA；并为第三台变压器准备一个基础。
There will befourcircuits of 400kVoutgoinglines, of whichtwocircuitswill outgo to theKapary400kVsubstation andtwocircuitsto theSoyo 400kV substation.
4台400/220/15kV单相自耦变压器，容量30MVA；
Oneunitof 220/60/15kVthree-phase power transformers withthecapacity of63MVA, and the foundation place for the third transformer will be prepared；
The220kV switchgear will be designed to be outdoor opened type. The short-circuit current will be calculated on40kA；220kV配电装置按户外敞开式设计，短路电流按40kA计算
The60kV switchgear will be designed to be outdoor opened type. The short-circuit current will be calculated on31.5kA.60kV配电装置按户外敞开式设计，短路电流按31.5kA计算。
220kV变压器：三相油浸有载调压变压器，变比为：220 8x1.25%/60kV，容量为63MVA；
The400kV switchgear will be designed to be outdoor opened type. The short-circuitcurrent will be calculated on40kA；400kV配电装置按户外敞开式设计，短路电流按40kA计算；
400kV变压器：单相油浸有载调压自耦变压器，变比为：400/220 8x1. 25%/15kV，容量为30MVA；
220kV transformer：three-phase oil-immersed on-load tap change transformer with the transformation ratio of220 8x1.25%/60kV and capacity of 63MVA；
3.2 Electricalpart电气部分
3.2.1 Design standard设计标准
3.2.1.1 IEC
3.2.1.2 IEEE
3.2.2 Construction capacity工程规模
Capacity:规模