How to arrange transformers in hydropower plants

In modern power system, hydropower plant is an important energy production unit, and the rationality of its main electrical wiring and equipment layout directly affects the safety, economy and stability of power plant operation. As the key equipment of voltage conversion and energy transmission in hydropower plant, the layout of transformer is very important. Reasonable transformer layout can not only improve the operation efficiency of equipment, but also provide convenience for maintenance and ensure the long-term stable operation of power plant.

First, the basic principles of transformer layout

When arranging transformers, the following basic principles should be followed:

1. Safety distance requirements: the electrical safety clearance must be met, and the safety distance between high-voltage equipment and between equipment and buildings must be ensured to prevent arcing or misoperation accidents.
2. Convenient transportation and installation: Considering the large volume and heavy weight of the transformer, sufficient transportation channels should be reserved to facilitate the hoisting, replacement and maintenance of the equipment.
3. Convenient operation and maintenance: set up reasonable patrol channel and operation space to facilitate daily patrol, maintenance and fault handling.
4. Fire-proof and explosion-proof requirements: The transformer belongs to oil-immersed equipment, and there is a certain fire risk. Fire-proof isolation measures should be considered when layout, and emergency oil pools and fire-fighting facilities should be set up if necessary.
5. Good ventilation and heat dissipation: A lot of heat will be generated during the operation of the transformer, and good ventilation conditions will help the equipment to dissipate heat and prolong its service life.

Second, the common layout

According to the structural form and site conditions of hydropower plants, transformer layout usually has the following ways:

1. Outdoor layout
Outdoor layout is the most common way, which is suitable for areas with sufficient space and good climatic conditions. The transformer is installed on the outdoor platform, which is well ventilated, conducive to heat dissipation and convenient for maintenance and expansion. However, rain, dust and corrosion protection measures should be taken.

2. Indoor layout
In some areas with limited space or bad weather, transformers can be arranged indoors. Indoor layout can reduce the influence of environmental factors on equipment, but it needs good ventilation system and fire prevention facilities, and the cost is relatively high.

3. Underground layout
In some special terrain or urban hydropower stations, in order to save ground space, transformers are often arranged underground. This arrangement requires high waterproof, ventilation, heat removal and emergency evacuation, and the technology is complex, but it can effectively save ground resources.

4. Joint layout with the main workshop
In small hydropower stations, transformers are often arranged on the outside of the factory building or on the roof nearby, which is convenient for connecting generators and transmission lines. This arrangement is compact and saves space, but special attention should be paid to earthquake prevention, noise prevention and heat dissipation.

Third, the specific layout example analysis

Taking a medium-sized hydropower plant as an example, the installed capacity of the plant is large, and the outdoor layout of main transformers is adopted. The main transformer is located at the downstream side of the main building, close to the outlet platform, which is convenient for access to the regional power grid. At the same time, there is a firewall and an accident oil pool around the transformer, and an automatic fire extinguishing device is equipped. There are maintenance channels and cable trenches between the transformer and the factory building, which not only ensures the safety, but also improves the operation and maintenance efficiency.

In addition, the factory has also set up auxiliary transformers, which are arranged near the high and low voltage distribution rooms respectively, so as to supply power to auxiliary equipment. Through reasonable partition layout, the whole power system is stable in operation and convenient in maintenance.

IV. Conclusion

To sum up, the arrangement of transformers in hydropower plants is a systematic project, involving many professional fields such as electrical, civil engineering, fire protection and environmental protection. The design should be combined with the actual situation of the power plant, comprehensively consider the geographical environment, operation requirements, safety specifications and other factors, and adopt a scientific and reasonable layout scheme to ensure the safe and efficient operation of the power plant. With the development of smart grid and green energy, transformer layout will pay more attention to energy conservation, environmental protection and intelligent management in the future, which will provide strong support for the sustainable development of hydropower plants.