Which Type Of Box Transformer Has The Best Flame Retardant Effect?

Which type of box transformer has the best flame retardant effect?

I believe those who have known about box type substations know that the internal components of box type substations are integrated electrical equipment composed of high and low voltage switchgear, substation equipment, and other transmission and distribution equipment. Although the arrangement is in the form of a 'product' or 'item' structure, and each equipment has its own compartment, the internal equipment is interconnected, making it easy for the fire to spread throughout the entire box. However, there are partition layers between each compartment that protect equipment and stabilize the structure, and the materials of these partition layers are basically the same as those of the shell.

Fengyuan Electric Equipment, a manufacturer of box transformer shells, conducted flame retardant tests on box transformer shells based on this characteristic, and conducted simulation experiments on accidental fires in various compartments under various scenarios.

1. During the overload operation of the transformer, a large amount of heat is emitted due to useless power dissipation, leading to the dissolution of tin points on the connecting terminals of the transmission line and the transformer, causing displacement and the generation of electric arcs, leading to a fire. Assuming an oil immersed transformer is used, the indoor temperature instantly increases to thousands of degrees Celsius. The PVC plastic load plate box transformer casing first experiences ignition, followed by the metal composite plate and carved plate. The metal plate is not ignited, but due to high temperature heat transfer, there is a heating phenomenon in the two compartments, which makes it easy to be ignited. Finally, the cement box transformer is not greatly affected.

2. The fire caused by the interior of the switchgear, where the temperature generated by indoor combustion is relatively low and the combustion time is relatively short, only affects the core inside the composite board with added insulation layer. Various box equipment can still achieve a relatively flame retardant effect, and the difference is not very obvious.

After conducting experiments on various types of boxes, we have come to the following conclusion: under the condition of high-temperature combustion of internal equipment, composite board box transformer shells with poor thermal conductivity are prone to chain reactions, and cement box transformer shells are superior

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