How to protect indoor transformer

With the continuous development of modern power system, transformers, as important equipment for power transmission and distribution, are widely used in various buildings and industrial facilities. Indoor transformers, in particular, play a vital role in urban power grids, commercial buildings, hospitals, data centers and other places. However, due to the heat, electromagnetic field and potential failure risk during its operation, the safety protection of indoor transformers is particularly important. This paper will discuss the protection measures of indoor transformer from the aspects of fire prevention, ventilation, insulation, electromagnetic interference and daily maintenance.
　　First of all, fire protection is one of the core contents of indoor transformer protection. Transformer usually contains insulating oil or combustible materials such as epoxy resin, which can easily lead to fire in case of short circuit, overload and other faults. Therefore, the transformer room should be equipped with automatic fire extinguishing system, such as gas fire extinguishing system or water spray fire extinguishing device, and equipped with smoke alarm and temperature sensor to realize early fire warning and automatic fire fighting. In addition, the transformer room should be made of fireproof materials, and the walls, doors and windows should have certain fire resistance limits to prevent the fire from spreading.
　　econdly, a good ventilation and cooling system is very important to ensure the normal operation of the transformer. The transformer will continue to generate heat during operation. If the heat dissipation is not good, it will lead to the temperature rise of the equipment, affect its service life and even cause failure. Therefore, the transformer room must be equipped with a forced ventilation system to ensure air circulation, and a temperature monitoring device should be set to monitor the operating environment temperature in real time. At the same time, enough space should be left around the transformer to avoid stacking flammable items or obstructing air circulation.

Third, electrical insulation protection is also a link that cannot be ignored. In order to prevent short-circuit accidents caused by insulation aging or moisture, high-quality insulation materials should be selected and insulation tests should be carried out regularly. The transformer room should be kept dry, and dehumidification equipment can be installed when necessary to prevent the insulation performance from decreasing due to moisture intrusion. In addition, the grounding system must be improved to ensure that the shell is reliably grounded to prevent potential safety hazards caused by leakage and electrostatic accumulation.

Fourth, anti-electromagnetic interference measures should also be included in the protection system. The electromagnetic field generated by transformer operation may cause interference to surrounding electronic equipment, especially in places where precision instruments are concentrated, such as hospitals and data centers. Therefore, the installation position of transformer should be planned reasonably to avoid being close to sensitive equipment, and electromagnetic shielding measures should be taken, such as installing metal shielding net or using transformer with low electromagnetic radiation design.
　　Finally, regular inspection and maintenance is the basis to ensure the long-term stable operation of transformers. A perfect operation file and maintenance system should be established, and the transformer should be inspected regularly to check the oil level, terminal fastening, operation sound and temperature change. Problems found should be dealt with in time to prevent minor faults from turning into major accidents.

To sum up, the safety protection of indoor transformer is a systematic project, which needs comprehensive consideration from fire prevention, ventilation, insulation, electromagnetic interference control and daily maintenance. Only through scientific and reasonable protective measures can we ensure the safe and stable operation of transformers, thus ensuring the reliability and safety of the whole power system.