A dry-type transformer is a type of electrical equipment. Generally, dry-type transformers also require a certain overload capacity, which is the amount of work exceeding their operating capacity. Many factors influence the overload capacity of a dry-type transformer. Today, we'll discuss the overload capacity of a dry-type transformer and how to determine these influencing factors:
dry-type transformer
The overload capacity of a dry-type transformer is related to the ambient temperature, the load conditions before overload (initial load), the insulation and heat dissipation of the transformer, and the heating time constant. If necessary, the overload curve of the dry-type transformer can be obtained from the manufacturer.
Currently, my country's annual production of resin-insulated dry-type transformers has reached 10,000 MVA, making it one of the world's largest producers and sellers of dry-type transformers. With the widespread application of the low-noise (noise level of distribution transformers below 2500kVA has been controlled below 50dB) and energy-saving (no-load loss reduced by up to 25%) SC(B)9 series, the performance indicators and manufacturing technology of my country's dry-type transformers have reached the world's advanced level.
With the widespread application of dry-type transformers, their manufacturing technology has also made great strides. It can be predicted that dry-type transformers will be further developed in the following aspects in the future.
(1) Energy saving and low noise: With the introduction of new low-consumption silicon steel sheets, foil winding structure, stepped iron core joints, environmental protection requirements, noise research, and computer optimization design, the future dry-type transformers will be more energy-efficient and quieter.
(2) High reliability: Improving product quality and reliability will be people’s unremitting pursuit.
(3) Environmental protection characteristics certification: Based on the European standard HD464, conduct research and certification on the weather resistance (C0, C1, C2), environmental resistance (E0, E1, E2) and fire resistance (F0, F1, F2) characteristics of dry-type transformers.
(4) Large capacity: From dry-type transformers, mainly 50-2500kVA distribution transformers, to 10000-20000kVA/35kV power transformers. As urban electricity load continues to increase, urban power grid substations are increasingly penetrating into urban centers, residential areas, large factories and mines, and other load centers. 35kV large-capacity community center power supply transformers will be widely used.
(5) Multifunctional combination: From single transformers to multifunctional combined transformers with air cooling, protective enclosure, temperature computer interface, zero-sequence current transformer, power metering, enclosed busbar and side outgoing line.
