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西电集团

China Yangtze Three Gorges Project

China Yangtze three gorges project is the largest water control project in China and also the largest in the world.
The dam is located in Sandouping, Yichang City.
Three gorges substation has 32 sets of 700,000kW hydro-generator and 2 sets of 50,000 kW hydro-generators, total 22,500,000 kW installed capacity, annual generation capacity over 100,000,000,000 kWh and it is the hydro-power station with largest installed capacity in the world. It transmits the power to Central China electric power and Chuandong electric power by 500kV AC mode and to east China electric power ±500 DC mode.
The hydro-power station adopts dam-rear type arrangement scheme, total two groups of workshop, left bank and right bank. It has 26 hydro-generators where 14 on the left bank and 12 on the right bank. The hydraulic turbine is of mixed flow type and the rated capacity of single machine in generator sets is 700,000 kW. The right bank underground power station has 6 generator and total 4,200,000 kW capacity.
China XD Group provided the key equipments for the following projects in three gorges project:
1. Three gorges hydro-power project
1) Three gorges left bank project: 500kV combined electrical appliance, 500kV reactor, neutral reactor and its corollary equipment, 500kV voltage transformer and its accessory equipments etc key equipments.
2) Three gorges right bank project: 500kV combined electrical appliance, 500kV voltage transformer and its accessory equipments, neutral reactor and its corollary equipment, single pole earthing switch and arrester etc key equipments.
3) Three gorges underground power station project: 500kV combined electrical appliance, 500kV reactor, neutral reactor and its corollary equipment, 500kV voltage transformer and its accessory equipments etc key equipments.


Three gorges left bank project GIS products brought into use in 2002


Three gorges right bank project GIS products brought into use in 2006


Three gorges underground project GIS products now being produced


2. Transmission project of Three gorges project
1) Three gorges-Changzhou DC transmission project 
The project west started from Longquan converter station, at 63km to east of Three gorges power station, through Hubei, Anhui and Jiangsu three provinces, across Hanjiang and Yangtze, east to Zhengping converter station, Changzhou, Jiangsu, total 860km, 3,000,000kW rated transmission capacity, 3000A rated DC current, ±500kV rated DC voltage, it is the DC transmission project with the largest transmission capacity and the longest transmission distance in the world.
XD Group provided the project with 2 converter transformer, 1 smoothing reactor, 116 thyristor components of 4 lock-shield valve.


Converter transformer in Three gorges-Changzhou DC transmission project


Smoothing reactor in Three gorges-Changzhou DC transmission project


XD Power Rectifier Company is was assembling the thyristor valves in Three gorges-Changzhou DC transmission project


Scene of converter transformer in Three gorges-Changzhou DC transmission project through Yellow River to Site

2) Three gorges-Guangdong ±500kV DC transmission project
Three gorges-Guangdong DC transmission project was the second channel of three gorges power station to transmit the power by DC mode and also the key project of transmitting 10,000,000 kW to Guangdong in the end of “Tenth-five”. The Three gorges-Guangdong line is about 976km and made of Jingzhou converter station, Huizhou converter station and Three gorges-Guangdong DC line.
XD Group wholly produced all the thyristor components for this project and also provided the project with 500kV station transformer, 500kV parallel reactor, 500kV capacitive voltage transformer, 500kV ZnO arrester, 500kV AC disconnector and 500kV post insulator etc key AC equipments.


Assembled thyristor components in Three gorges-Guangdong project


Lifting the converter transformer for Three gorges-Guangdong project


Converter transformer for Three gorges-Guangdong project in test


Road transportation Scene of converter transformer in Three gorges-Guangdong project 


3) Three gorges-Shanghai DC transmission project
Three gorges-Shanghai DC transmission project west started Yido converter station, Yichang City, Hubei, east to Huaxin converter station, Qingpu district, Shanghai, total about 1040km, across Hanjiang and Yangtze, through Hubei, Anhui, Jiangsu, Zhejiang and Shanghai four provinces and one municipality, 33 areas and counties and it was the main transmission channel of three gorges right bank power station.
Xi’an XD Transformer Company of XD Group provided the project with 14 sets of converter transformer and 3 sets of smoothing reactor and Xi’an XD Power Rectifier Company of XD Group provided the thyristor valve;
Xi'an High Voltage Apparatus Research Institute (XHVARI) and Beijing Wanglian HVDC engineering Company of XD Group together undertook the system study and design of whole set of converter station equipments for this project;
Xi’an XD Power Capacitor Company of XD Group provided 9 whole sets of capacitor device;
Xi’an Porcelain Institute provided the project with ZnO arrester for AC filter;

XD Group also provided the project with 500kV main transformer, 550kV GIS and accessory equipments etc key large equipments, 500kV high voltage parallel capacitor bank and capacity device, 500kV disconnector/earthing switch and 500kV post insulator etc high voltage AC equipments.


Thyristor valve for three gorges-Shanghai HVDC transmission project was taken insulation test in XHVARI of our company


Electric controlled thyristor valve (ETT valve) in three gorges-Shanghai HVDC transmission project


Converter transformer in three gorges-Shanghai HVDC transmission


Smoothing reactor in three gorges-Shanghai HVDC transmission project


Smoothing reactor in three gorges-Shanghai HVDC transmission project


ELK3 550kV GIS in three gorges-Shanghai HVDC transmission projectXD Group provided the enclosed bus and parallel capacitors for Huaxin Station

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