The windings of large power transformers use combined conductors or
transposed conductors, which can greatly reduce the load loss,
reduce the temperature rise of winding hot spots, improve the
mechanical strength of the windings, make the structure more
compact, and make the coil processing easier. It has been widely
used in the design and manufacture of large power transformer
windings. The composite wire is composed of several insulated
magnet wire or copper and aluminum wires arranged according to the
specified requirements. The winding wire is wrapped by a specific
insulating material.Transposed conductor refers to the combination
of a number of enameled copper flat wires into two rows with wide
surfaces in contact with each other, and according to the
requirements on the top and bottom of the two rows of enameled
wires along the narrow side of the same direction of transposition,
and electrical insulation tape is used. As a multi-layer continuous
and tightly wrapped composition The windings of large power
transformers use transposed conductors, which can greatly reduce
load loss, reduce the temperature rise of winding hot spots,
improve the mechanical strength of windings, make the structure
more compact, and make coil processing easier. It is widely used in
winding design and manufacture. In the production process of
transposed conductors, there will be a problem of poor external
dimensions of the transposed conductors. It is often found after
the next process that it is irreversible, so that the product
cannot be reordered. Winding process processing, adjusting the
insulation structure affects the efficiency and product quality.
Therefore, it is urgent to solve the existing problems of the large
width and height of the transformer winding transposition wire,
which is to solve the unqualified quality problem that the wire
causes the transformer coil radial and lateral diameter to
increase. Analysis of two factors affecting equipment and
processing methods:1. The transposition head stop number of the
transposition wire production line is not suitable. In the
production, the transposition head stop is used according to the
wire gauge. The transposition distance is large, the tightness of
the transposition wire is reduced, and the size will be larger. It
is one of the main factors that lead to the poor size of the
transposed conductor. 2. Although the size of the insulated
magnet wire is within the qualified range, for products with a
small winding coil diameter and a large number of enameled wires
per transposed conductor, the external dimensions of the transposed
conductor are likely to be poor. It is two of the main factors that
lead to the difference in the external dimensions of the transposed
wire.3. The mold size control is not suitable. Although it is
within the qualified range, the size of the mold size repaired for
a batch of products is the upper deviation, which is one of the
main factors leading to the difference in the external dimensions
of the transposed conductor./* January 22, 2024 19:08:37
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