CN100437845C - Offshore platform transformer - Google Patents

Abstract

The invention relates to an offshore platform transformer. In order to solve the problem that the existing transformer cannot adapt to sea conditions, its windings are wound by multi-strand transposed wires; longitudinal air passages are set between the high-voltage coils, and axial air passages are formed between the high-voltage windings and the insulating cylinder with formed stays, and the low-voltage coils Axial air passages are set between the coil and the high-voltage cylinder, and a top-blown cooling fan is set at the bottom of the high-voltage and low-voltage coils; between the iron core column and the internal winding, braces are fixed squarely and insulating rods are used to fill the gap, and between the internal winding and the external winding are braced. The bars are fixed in multiple directions, and the iron yoke clamp is welded by channel steel and square iron; multiple pairs of hanging screws are used for positioning between the upper part of the body and the shell, and multi-point positioning is carried out between the lower part of the body and the shell through foot bolts. The shell side wall is welded with positioning round steel for positioning. It has the advantages of strong corrosion resistance and erosion ability, good vibration resistance and impact performance, excellent insulation and heat dissipation performance, low loss, low noise, and can fully meet the harsh environmental conditions at sea and reliable performance.

Description

Offshore platform transformer

technical field

The invention relates to a power transformer, in particular to an offshore platform transformer.

Background technique

The environment of offshore oil drilling platforms is harsh, and there are many environmental factors that are not conducive to the normal operation of transformers, such as: air relative humidity, condensation, oil mist, salt mist and mold, ship vibration and shock, and the impact of sea storms. The performance of ordinary transformers used in the field is far from meeting the needs of offshore oil drilling platforms.

Contents of the invention

The object of the present invention is to overcome the above-mentioned defects of the prior art, and provide an offshore platform transformer that can adapt to harsh offshore environmental conditions.

In order to achieve the above-mentioned purpose, the cooling form of the offshore platform transformer of the present invention is dry type, the high-voltage coil is cake-type, the low-voltage coil is cylindrical type, and the winding is wound by multi-strand transposed wires; the high-voltage coil is arranged between every two adjacent cakes Longitudinal air passage, the high-voltage winding and the insulating cylinder are separated by forming braces to form an axial air passage, the axial air passage is set between the low-voltage coils and between the coil and the high-voltage cylinder, and the top-blown cooling fan is installed at the bottom of the high-voltage and low-voltage coils; the iron core column The gap between the internal winding and the internal winding is fixed by braces and insulating rods. The internal winding and the external winding are fixed by a plurality of evenly distributed forming stays. The iron yoke clamp is welded by channel steel and square iron; the upper part of the body Multiple pairs of hanging screws are used for positioning between the shell and the shell, multi-point positioning is carried out between the lower part of the body and the shell through foot bolts, and the positioning of the positioning round steel with a gap between the shell side wall welding and the body clamp .

Such design, non-encapsulated coil structure, direct contact between the wire and the cooling medium (air), the heat generated during the operation of the coil and the cooling air form convection, and the heat dissipation effect is good. Compared with multi-strand parallel wires, the winding adopts transposed wires, which not only reduces the size of the transformer, reduces the cost of the transformer, but more importantly, reduces the additional loss of the circulation and eddy current loss caused by the leakage magnetic field of the transformer, and at the same time improves It improves the mechanical strength of the winding and enhances the mechanical stability of the transformer winding when it is short-circuited. The iron yoke clamp is welded by channel steel and square iron to ensure that the clamp can bear the weight of the transformer body, can safely lift the body or iron core, and withstand the axial force generated by the coil when the transformer is short-circuited , and can keep noise down to a minimum level. The space between the iron core column and the internal winding is fixed by braces and insulating rods, and the internal winding and the external winding are fixed by a plurality of evenly distributed shaped stays, which can make the transformer have a high structural strength. The air volume generated by the fan during operation forms strong convection with the heat generated by the transformer coil, which speeds up the heat exchange between the coil and the cooling air. Multiple pairs of hanging screws are used for positioning between the upper part of the body and the shell, multi-point positioning is carried out between the lower part of the body and the shell through foot bolts, and there is a positioning circle with a gap between the shell side wall welding and the body clamp If the steel is used for positioning, it can ensure that there is no displacement, no looseness, and no deformation of the body when it is shaken by a large impact.

As an optimization, the iron core is stacked by step joints and fixed with semi-dry epoxy adhesive tape. With such a design, the iron core is stacked by step joints. This kind of step joint avoids the phenomenon that the local unit loss is several times higher than that of other cross-sections of the iron core, so that the iron core can reduce the core material under the condition of the same magnetic flux density. The weight, thus greatly improving the technical and economic indicators of the transformer.

As an optimization, both the high and low voltage sides go out from the top of the transformer box cover, and the top of the transformer box cover is equipped with a high-voltage cable box encapsulating high-voltage bushings, and the incoming lines are connected with insulated cables. Such a design can prevent the corrosion of the conductive rod of the transformer bushing by the salt mist and moisture.

As an optimization, the outgoing copper bars and conductive parts are equipped with a silver-plated protective layer, and the iron metal parts are equipped with a cadmium-plated protective layer. The surface of the box is derusted by shot blasting and then painted with ship paint. Such design can prevent salt spray, damp heat and mold corrosion.

As an optimization, the transposition winding wire is continuous transposition winding of the enamelled flat conductor and then wrapped with insulating paper. This design is more beneficial to reduce the additional loss of circulation and eddy current loss caused by the leakage magnetic field of the transformer, improve the mechanical strength of the winding, and enhance the mechanical stability of the transformer winding when it is short-circuited.

As an optimization, it is a variable frequency speed regulating transformer. This design is more convenient for the speed regulation of high-power motors on the platform.

After adopting the above technical solution, the offshore platform transformer of the present invention has the advantages of strong corrosion resistance and erosion ability, good vibration resistance and impact performance, excellent insulation and heat dissipation performance, low loss, low noise, and can fully meet the harsh offshore environmental conditions and reliable performance. .

Description of drawings

Fig. 1 is the structure schematic diagram of the device body positioning mechanism of offshore platform transformer of the present invention;

Fig. 2 is the B-B direction view of Fig. 1;

Fig. 3 is the bottom view structural diagram of Fig. 1;

Fig. 4 is a structural schematic diagram of the core column, internal winding and external winding of the offshore platform transformer of the present invention;

Fig. 5 is a structural schematic diagram of the high-voltage winding and the high-voltage insulating cylinder part of the offshore platform transformer of the present invention;

Fig. 6 is a structural schematic diagram of the air passage formed between the high and low voltage coils of the offshore platform transformer of the present invention and the insulating cylinder and the core column;

Fig. 7 is a structural schematic diagram of the fan and coil assembly form of the offshore platform transformer of the present invention;

Fig. 8 is a structural schematic diagram of the transposition wire of the offshore platform transformer of the present invention;

Fig. 9 is a structural schematic diagram of the iron yoke clamping part of the offshore platform transformer of the present invention;

Fig. 10 is a laminated view of the transformer on the offshore platform of the present invention with stepped seams.

Detailed ways

Below in conjunction with accompanying drawing and concrete example for further description:

As shown in Figures 1, 2 and 3, 1 is the square iron and insulation, 2 is the steel washer, 3 is the side screw, 4 is the high-voltage side clamp, 5 is the iron core, 6 is the low-voltage side clamp, 7 is the ground plate, 8 is clamp insulation, 9 is a pad, 10 is a pad insulation, 11 is a spacer, and 12 is a pull screw. Two pairs of hanging screws are used for positioning between the upper part of the body and the shell, six-point positioning is carried out between the lower part of the body and the shell through foot bolts, and there is a gap between the welding of the shell side wall and the clamping parts of the body. steel for positioning. That is, the ten-point positioning of the body: the three feet on the lower part of the body form a six-point positioning, which is fixed to the bottom of the shell by bolts and nuts; the hanging screw on the upper part of the body directly protrudes upwards from the shell, and the four hanging screws form a four-point positioning. Thus forming the overall frame of the core winding.

As shown in FIG. 4 , 22 is an iron core column, 13 is an insulating rod, 14 is a forming stay, 15 is an external winding, 16 is an internal winding, and 17 is a support plate. The space between the iron core column and the internal winding is fixed by braces and insulating rods, and the internal winding and the external winding are fixed by a plurality of evenly distributed shaped stays. Specifically: the iron core column is fixed and bound with semi-dry epoxy adhesive tape, and the transformer core with a small capacity can be directly bound on the iron core column; for large-scale transformers, it is placed in the "angle" formed by each level of the iron core before binding. Pad with insulating rods. The iron core column and the inner winding are fixed in four directions by braces, and the inner winding and the outer winding are fixed in eight directions or ten directions by formed braces. It can make the transformer have high structural strength.

As shown in Figure 5, 18 is a high-voltage insulating cylinder, 19 is a longitudinal air channel, 20 is an axial air channel, and 21 is a high-voltage winding. The cake structure of the high voltage winding is provided with a longitudinal air channel of 5-8mm between every two adjacent cakes; the high voltage winding and the insulating cylinder are spaced by formed stays to form an axial air channel, through which the longitudinal and axial air channels of the coil The setting of the channel enables each part of the coil to directly contact the cooling air, the heat dissipation area is large, the effect is good, and the local overheating of the winding can be avoided.

As shown in FIG. 6 , 22 is an iron core column, 23 is a low-voltage insulating cylinder, 18 is a high-voltage insulating cylinder, 20 is an axial airway, 241 is a high-voltage coil, and 242 is a low-voltage coil. The low-voltage winding adopts a layered coil structure, and axial air passages are set between each layer of the coil and between the coil and the high-voltage cylinder, so that the heat generated by the winding during operation can be easily dissipated.

As shown in FIG. 7 , 25 is a clip, 24 is a coil, and 26 is a fan. Three top-blowing cooling fans are installed at the bottom of the high and low voltage sides of the transformer, and the fan model is selected according to the size of the transformer capacity. The air volume generated by the fan during operation forms strong convection with the heat generated by the transformer coil, which speeds up the heat exchange between the coil and the cooling air.

As shown in Figure 8, 27 is the total wrapping insulation paper, 28 is the enamelled flat wire, and 29 is the intermediate backing paper. The windings are wound with transposed wires. The transposed conductor is made of small spacing from beginning to end, continuous cycle transposition and insulation. Compared with multi-strand parallel wires, it not only reduces the volume of the transformer, reduces the cost of the transformer, but more importantly, reduces the additional loss of the circulation and eddy current loss caused by the leakage magnetic field of the transformer, and at the same time improves the mechanical strength of the winding and strengthens the transformer. The mechanical stability of the winding in the event of a short circuit.

As shown in Figure 9, 25 is a clip, 30 is a square iron, 31 is a square iron insulation, and 32 is a sleeper. The clamping method of the iron yoke adopts the "square iron" structure at the corner of the iron core. The function of the square iron is not only to clamp the iron yoke, but also to position the upper and lower clamps and the iron core, so as to ensure that the clamps can bear the weight of the transformer body, can safely lift the body or iron core, and when the transformer is short-circuited, Withstand the axial force generated by the coil.

As shown in Figure 10, a) longitudinal (A, B) and transverse (C, D) staggered, b) stepped seams of stem (upper) and lower yoke (lower) stepped seams. The core is laminated with stepped seams. Because this step joint avoids the phenomenon that the local unit loss is several times higher than that of other cross-sections of the core, the weight of the core material can be reduced under the same magnetic flux density of the core, thus greatly improving the technical and economic indicators of the transformer.

The clamps and shell parts of the transformer are subjected to shot blasting after the processing of various parts and threaded holes is completed. Shot peening is to use compressed air with a certain pressure to spray steel grit on the surface of the workpiece, and use the impact force of high-speed steel grit to peel off the oxide skin, rust and stains on the surface of the steel plate, exposing the fresh metal surface, so as to ensure the adhesion of the surface paint. Efforts to protect the metal from atmospheric corrosion. If shot blasting is not carried out, the paint cannot directly contact and adhere to the metal surface, but adheres to the oxide layer when the steel plate is rolled. If there is oil stain during the processing, the adhesion will be worse (the paint is applied to the oil film. ), so even if the primer is useless, in a short period of time, the primer will fall off, and of course the topcoat will be useless.

That is, the cooling form is dry type, the high-voltage coil is cake-type, the low-voltage coil is cylindrical, and the winding is wound by multiple transposed wires; the high-voltage coil is provided with a longitudinal air passage between every two adjacent cakes, and the high-voltage winding and the insulating cylinder Formed stays are used to form axial air passages between them. Axial air passages are set between low-voltage coils and between coils and high-voltage cylinders. Top-blown cooling fans are installed at the bottom of high and low-voltage coils; iron core columns and internal windings are fixed with braces in four directions. and insulating rods to fill the gap, the inner winding and the outer winding are fixed in multiple directions with evenly distributed forming stays, the iron yoke clamp is welded by channel steel and square iron; the upper part of the body and the shell are connected by multiple pairs of hangers Screw positioning, multi-point positioning between the lower part of the body and the shell through the foot bolts, and the positioning of the positioning round steel with a gap between the shell side wall welding and the body clamp. The iron core is stacked by stepped joints and fixed with semi-dry epoxy adhesive tape. Both the high and low voltage sides go out from the top of the box cover, and the top of the box cover is equipped with a high-voltage cable box encapsulating high-voltage bushings, and the incoming lines are connected with insulated cables. Outlet copper bars and conductive parts are provided with a silver-plated protective layer, iron metal solid parts are provided with a cadmium-plated protective layer, and the surface of the box is derusted by shot blasting and then painted with ship paint. Transposition winding wire is continuous transposition winding of enamelled flat wire and then wrapped with insulating paper.

Claims (1)

1, a kind of offshore platform transformer is characterized in that methods for cooling is a dry type, and the high pressure winding is the cake formula, and the low pressure winding is a drum type brake, and the high-low pressure winding is by the multiply winding transposition wire; The high pressure winding is provided with vertical air flue between per two adjacent cakes, be partitioned into axial air flue with the moulding stay between high pressure winding and High-Voltage Insulation tube, between the low pressure winding and between low pressure winding and High-Voltage Insulation tube axial air flue is set, high-low pressure winding bottom is provided with the top-blown cooling blower; Plug the gap with insulating rod with fagging is fixing on the four direction all around between core limb and low pressure winding, fixing in many ways with equally distributed a plurality of moulding stays between low pressure winding and high pressure winding, yoke clip piece is welded by channel-section steel and square iron; Carry out multipoint positioning to hanging between screw rod location, device body bottom and the housing by foundation bolt with many between device body and the housing, housing sidewall welding and be installed in the location round steel that leaves the gap between the device body folder of transformer body upper and lower and position.

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