Dry-type transformer is a kind of power equipment, and under normal circumstances, dry-type transformer also requires a certain amount of overload, that is, the workload beyond its working ability. So what about the overload of dry-type transformers and how to influence them?
Dry-type transformers
The overload of the dry-type transformer can be related to the ambient temperature, the load condition before the overload (starting load), the insulation and heat dissipation status of the transformer and the heating time constant, etc., if necessary, the overload curve of the dry-type transformer can be obtained from the manufacturer.
At present, the annual output of resin insulated dry-type transformers in China has reached 10,000MVA, becoming one of the countries with the largest production and sales of dry-type transformers in the world. With the popularization and application of the SC (B) 9 series with low noise (the noise of distribution transformers below 2500kVA has been controlled within 50dB) and energy saving (no-load loss reduced by 25%), the performance indicators and manufacturing technology of dry-type transformers in China have reached the world's advanced level.
With the popularization and application of dry-type transformers, its production technology has also made great progress, and it can be predicted that the future dry-type transformers will make further development in the following aspects.
(1) Energy saving and low noise: With the introduction of new low-consumption silicon steel sheets, foil winding structures, stepped core joints, environmental protection requirements, in-depth noise discussions, and the introduction of new materials, new processes and new technologies such as computer optimization planning, the future dry-type transformers will be more energy-saving 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, the research and certification of weather resistance (C0, C1, C2), environmental resistance (E0, E1, E2) and fire resistance (F0, F1, F2) characteristics of dry-type transformers are carried out.
(4) Large capacity: from 50-2500kVA distribution transformer-based dry-type transformer, to 10000-20000kVA/35kV power transformer, with the increasing urban electricity load, urban grid regional substations are more and more deeply into the urban center of the city, residential areas, large factories and mines and other load centers, 35kV large-capacity community center power supply power transformer will be widely used.
(5) Multi-functional combination: from a single transformer to a multi-functional combined transformer with air cooling, protective shell, temperature computer interface, zero sequence transformer, power metering, closed bus and side outlet.
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