Comparison Between SGB And SCB Indoor Dry Type Transformer

1. High loss:

The loss value specified in the national standard of SGB indoor dry type transformer is too high. Because the SGB type transformer is a non-encapsulated type dry-type distribution transformer, the national standard implemented by it is higher than the national standard loss value implemented by the epoxy resin cast-encapsulated type dry-type distribution transformer (SCB type).

2. Poor partial discharge and lightning impact resistance:

SGB indoor dry type transformer cake structure coil still has many gaps between the coil turns after vacuum impregnation. In some harsh working environments such as basements, it is easy to accumulate dust and absorb moisture, which determines its partial discharge and lightning impact resistance. Poor; while the epoxy casting dry-type transformer coil has no air gap between the coil turns after vacuum casting, and the conductor forms a closed whole after vacuum casting with epoxy resin, which does not absorb moisture. The surface of the casting coil is very smooth and it is difficult to stick Even if there is dust adsorption, because the wire is encapsulated in the resin, it will not affect the performance of the transformer. The partial discharge capacity of each transformer is less than 5PC, and it can be used in high temperature and humidity environments. Its ability to resist lightning shock It also exceeds the requirements of national standards.

3. Poor mechanical strength and dielectric strength:

The SGB indoor dry type transformer is non-encapsulated, and the high and low voltage coils are cake-shaped structures. Each coil is made of dozens of wire cakes fixed on a comb-shaped stay, and then vacuum-impregnated. The coils and comb-like stays are arranged alternately, and each line cake is an independent individual. For indoor dry type transformers, the magnet wires and insulating materials are formed by resin vacuum casting, and the entire coil is a rigid whole. Its mechanical strength is obviously better than that of SGB type transformer.

There is only a thin layer of insulation on the surface of the SGB indoor dry type transformer coil. When encountering sharp external forces, such as scratches, bumps, and collisions during transportation or installation, it is easy to damage the insulation, leave hidden dangers or cause short circuits, and the insulation is too thin to withstand Electric shock will affect the electrical performance and service life of the transformer.

4. Large noise, no-load loss and no-load current:

The indoor dry type transformer iron core is one of the core parts of the transformer. The quality of the iron core manufacturing process directly affects the loss and noise of the transformer. The iron core produced by our factory has the advantages of low no-load loss, low no-load current and low noise.