Key points for the construction of box-type transformers: foundation, location, and safety precautions

What should be paid attention to during the construction of box-type transformers?

The key component of Photovoltaic power generation and energy storage systems is the box-type transformer, and its installation quality has a critical and direct impact on the safe and stable operation of the entire system. As an engineer with many years of experience in power distribution construction for new energy projects, I have a profound understanding of the complexity and importance of this work.

What should be paid attention to during the construction of box-type transformers?

The foundation construction of the box-type transformer occupies a fundamental position in the entire project. Its foundation must be level and firm, and the depth and strength of the concrete pouring must meet the design requirements. In addition, dedicated drainage facilities should be installed around the foundation to prevent water accumulation and subsequent corrosion of the equipment.

The selection of the installation location for a box-type transformer is also extremely important. It should be located away from flammable and explosive materials, and sufficient space must be reserved around it for operation and maintenance.

In photovoltaic projects, installation is usually carried out in locations that are relatively high in elevation and have good ventilation.

What are the steps involved in installing a box-type transformer?

In the installation process of a prefabricated transformer, wiring work plays a crucial role. For the cable connections between the high-voltage and low-voltage sides, the construction operations must be carried out strictly according to the drawings. In other words, the terminals must be tightened to ensure a secure connection, and conductive grease must be evenly applied to the contact surfaces to improve conductivity. Furthermore, before construction, insulation testing of the cables must be performed. Through meticulous inspection, it must be ensured that the cables are free from damage or moisture, thus laying a solid foundation for the safe and stable operation of the prefabricated transformer.

In the entire wiring process, every step is crucial. It begins with construction according to the drawings, followed by tightening the terminals and applying conductive paste, and then conducting a final cable insulation test. Each step is closely interconnected; neglecting any one will result in failure. Only by strictly adhering to standards in each step can the quality of the box-type transformer wiring be guaranteed, ensuring its normal and efficient operation and providing a reliable guarantee for power supply.

The construction of the grounding system is of paramount importance and must not be overlooked or neglected. The grounding resistance has strict requirements and must be strictly controlled within 4 ohms. The grounding wire needs to be carefully and properly connected to the neutral point of the transformer, and also to the transformer casing.

Within a photovoltaic project, the quality of the grounding system is directly related to the safety of equipment and personnel. Its quality plays a crucial role in the stable operation of the entire photovoltaic project, affecting whether the equipment can operate normally and whether personnel can be kept within a safe range.

What should be paid attention to during the commissioning of box-type transformers?

Prefabricated box-type transformers play a crucial role in power systems, and their commissioning is directly related to the stability and security of the entire power supply. Therefore, what should be paid attention to when commissioning a prefabricated box-type transformer? This is a key concern for many power industry workers. During the commissioning process, every detail can affect the transformer's performance, so it is essential to pay close attention. From the initial inspection of the equipment to the precise measurement of various parameters and the comprehensive testing of its functions, all operations must be strictly carried out according to standardized procedures to ensure the normal and efficient operation of the prefabricated box-type transformer, providing a reliable guarantee for power transmission.

First, a thorough and meticulous visual inspection of the box-type transformer is necessary. This includes checking for significant damage or deformation of the enclosure, ensuring connections are secure and reliable, and verifying proper sealing. These seemingly basic checks are crucial, as even minor flaws can cause problems during subsequent operation. Simultaneously, each internal electrical component must be checked to ensure it is undamaged, secure, and that wiring connections are accurate. Only after the visual inspection is satisfactory can the next step of commissioning proceed. Next, precise measurements of various electrical parameters, including voltage, current, and resistance, must be performed. Professional measuring instruments and procedures must be followed to obtain accurate data. Analysis of these parameters determines whether the transformer is operating normally. Additionally, the transformer's insulation performance must be tested to ensure it is in good condition and prevent potential safety hazards such as leakage. After completing parameter measurements and insulation testing, a comprehensive functional test of the box-type transformer is then conducted. For example, it's necessary to test whether its transformer function is normal, and whether it can accurately convert the input voltage to the output voltage according to the specified ratio; it's also necessary to test whether its protection function is sensitive and effective, and whether it can quickly cut off the circuit to protect equipment and personnel safety in the event of overload, short circuit or other abnormal conditions. Only after undergoing such rigorous commissioning procedures, and when all indicators meet the requirements, can the box-type transformer be officially put into use and contribute to the stable operation of the power system.

Before commissioning, a comprehensive and meticulous inspection is required, covering various aspects such as the tightness of bolts, insulation resistance testing, and turns ratio testing. During the no-load trial run, close attention must be paid to the sounds emitted by the transformer and any temperature changes. Load operation can only proceed after confirming that no abnormalities are found.

Changsong Electric Co., Ltd. is a professional manufacturer of low-voltage electrical complete sets of equipment and electrical components, possessing multiple functions including R&D, production, and sales. The company focuses on providing safe, reliable, and efficient grid-connected power distribution solutions for new energy projects such as photovoltaic power generation and energy storage systems. Its products are widely used in various scenarios, including residential photovoltaic systems, industrial and commercial distributed photovoltaic systems, large-scale ground-mounted power stations, and energy storage systems, playing a vital role in these applications.