Dry-type transformer service tools

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The safety performance of the operation of Dry-type single phase transformer is worthy of everyone's attention, and the operation of Dry-type single phase transformer is also worthy of everyone's general attention. For the dry-type transformer operation and work to do the dry-type transformer maintenance, frequent dry-type transformer maintenance can make the dry-type transformer find a lot of problems, timely to solve, can be said to be dry-type transformer to do a whole body "physical examination". The maintenance of Dry-type single phase transformer requires the use of a series of tools, so what are the tools used for dry-type transformer maintenance? Or with the dry-type transformer manufacturer's 10,000 control to understand:

Cylindrical winding

It is a cylindrical spiral with wire turns wound close to each other with flat wires, as shown in the figure on the left. Cylindrical windings can be wound into a single layer; It can also be wound into a double layer. It is usually always possible to avoid using a single-layer cylinder and instead wind it into a double-layer cylinder. Because when winding into a single layer, the wire is affected by elastic deformation, and the coil is easy to loosen, so that the end wire turns are not close enough to each other; And after winding into a double layer, the tendency to loosen is much smaller. When the current is large, each wire turn is also used to wind several wires in parallel along the axial direction, but the number of parallel wires is usually not more than 4~5. The contact area between the cylindrical winding and the cooling medium, so the cooling conditions are better, but its mechanical strength is weak, and it is generally suitable for low-voltage windings of Dry-type single phase transformer with small capacity.

(a) Shape (b) Longitudinal profile wire arrangement.

The low-voltage winding turns of the dry-type transformer with a slightly larger capacity are very small (less than 20~30 turns), but the current is large, so the cross-section of the wire turns is required, so many wires (6 or more) are used to be connected in parallel to wind. In the cylindrical winding, it is not possible to use many wires in parallel to wind, because these wires have to be arranged one by one in the same layer, as a result, the pitch of the wire turn is too large, such a coil is very unstable, and the height is not well utilized, so it is not appropriate to use cylindrical winding when there are many parallel wires, so there is a spiral winding, as shown in the figure. It is stacked one by one in the radial direction. Instead of being close to each other like cylindrical windings, the spirals are left with an empty channel in the middle.

When there are more spiral windings connected in parallel, the wires can be divided into two groups, so that it becomes a double-layer spiral. When the temperature rise and insulation conditions permit, the spiral winding can adopt the structure of normal width oil passage and small oil passage staggered winding, the width of the small oil channel is about half of the normal oil channel width (about 1.5~2mm), so it is called half helix, and the winding is called single half helix; When the winding is a double helix, it is called a double half helix. This kind of semi-spiral winding has a relatively high space utilization rate and is widely used in large and medium-sized Dry-type single phase transformer.

The problem that needs to be paid attention to in dry-type transformer maintenance is introduced to you above, and certain tools are required for dry-type transformer maintenance, so that the dry-type transformer maintenance can be carried out smoothly. If you have any other questions about dry-type transformer maintenance, please contact our manufacturer and our technicians for understanding