High and low voltage prefabricated substation outdoor complete distribution equipment box type transformer

Description :

  Prefabricated substation is a factory prefabricated indoor and outdoor compact distribution equipment that integrates high-voltage switchgear, distribution transformers, and low-voltage distribution devices according to a certain wiring scheme. It is mainly used for receiving and distributing electricity in urban high-rise buildings, residential communities, factories, mines, etc., to solve the problems of large land occupation and long construction period of traditional civil engineering substations. This device is suitable for use in three-phase AC systems with an AC frequency of 50Hz and a rated voltage of 10kV or below, as a public distribution location for receiving and distributing electrical energy. Prefabricated substations have the characteristics of compact structure, easy installation, reliable operation, and simple maintenance, which can effectively reduce line losses and improve power supply quality. They are important equipment in modern distribution network transformation and construction.

  The shell of prefabricated substations is usually made of steel plates, aluminum alloy plates or non-metallic materials that have undergone anti-corrosion treatment, with good protective performance and a protection level generally reaching IP33 or higher. The internal high-voltage room, transformer room, and low-voltage room are independent of each other and separated by partitions to ensure safe operation. High voltage rooms are usually equipped with load switches, fuses, lightning arresters, and other components. Transformer rooms are equipped with oil immersed or dry-type transformers, while low-voltage rooms are equipped with circuit breakers, isolation switches, measuring instruments, and so on. The equipment complies with national standards such as GB/T 17467 "High Voltage/Low Voltage Prefabricated Substations" and undergoes strict type and factory tests, including insulation tests, temperature rise tests, short-circuit withstand strength tests, etc., to ensure stable operation even in harsh environments.

  When selecting a prefabricated substation, comprehensive consideration should be given to factors such as load nature, capacity requirements, and environmental conditions. Suitable for densely populated urban centers, scenic tourist areas, temporary construction sites, and other places that require aesthetics and land occupation. Not suitable for special environments with severe vibration, strong corrosive gases, or flammable and explosive hazards. Compared with ordinary civil substations, prefabricated substations occupy a smaller area, about 1/10 to 1/5 of the same scale civil substations, and do not require on-site pouring of foundations. They can be installed by leveling the ground, greatly shortening the construction period. If the load fluctuates greatly, it is recommended to choose a transformer with strong overload capacity; If the environment is humid, the moisture-proof and anti-corrosion treatment of the shell should be strengthened.

  The installation of prefabricated substations should choose locations with high terrain, good drainage, and no severe vibration, and the foundation should be level and firm. Daily maintenance requires regular inspection of the casing for rust and damage, as well as the integrity of the door lock to prevent small animals from entering. Regularly inspect the oil level and temperature of the transformer to ensure they are normal, check for any oil leakage, and listen for any abnormal operating sounds. Check whether the contacts of the high and low voltage switches are in good contact, whether there is overheating or discoloration, and whether the instrument readings are accurate. It is recommended to conduct power outage cleaning and maintenance once a year, tighten connecting bolts, and test insulation resistance. Common faults include transformer overheating, switch refusal to operate, etc. The causes should be promptly investigated and dealt with to ensure the long-term safe and stable operation of the equipment and extend the service life of prefabricated substations.

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