EA043739B1 - DRY MODULAR TRANSFORMER FOR OUTDOOR INSTALLATION (UPGRADED) - Google Patents

Description

Field of technology

The invention relates to the field of electrical engineering in the conversion, transmission, distribution and transportation of electricity and can be used in the manufacture of dry-type transformers for outdoor installation.

Technology level

A modular dry transformer for outdoor installation is known, EAPO patent No. 034945, in which the magnetic core is made of twisted magnetic cores made of amorphous alloys, the disadvantage of which is the high cost of the final product.

The frame is made of stamped sheet steel (magnetic material), on which there is a twisted magnetic circuit made of amorphous alloys with an oblique cut, tightened with a clamp made of strip steel, which closes the magnetic fluxes, increasing losses.

The secondary winding (LV) is made of two sections, main and control, which complicates the manufacturing process and operation.

The oblique cut on the magnetic circuit is difficult to manufacture and adjust during the assembly process.

Dry transformers OL-10 cast with epoxy compound are also known, which have the following disadvantages: non-repairability: in case of any damage, it is necessary to replace the entire transformer; connections of inputs to the switching device require a safe distance from the grounded part of the support structure, which entails the need to install the transformer at a sufficient distance according to the PUE in order to avoid short circuits and protection from birds and living creatures; since the transformer is located at a sufficiently distant distance from the support, this creates windage and torque on the support body; large no-load losses 100 W; poor heat dissipation.

The essence of the invention

Tasks performed by the invention.

Use: in electrical engineering, the claimed transformer eliminates the listed disadvantages present in known transformers, while new technical properties are obtained, which are described below.

Technical result.

1. By manufacturing the secondary winding (LV) as a single unit, the manufacturing and operation process is simplified.

2. The bed, pressure plate and tie rods are made of non-magnetic materials, which eliminates the short circuit of magnetic fluxes, which reduces no-load losses.

3. High level of reliability, reduction in manual labor and the number of components due to the manufacturability of the manufacturing process, which remains the same during repair work. Repairs, due to the modularity of the transformer, are reduced to replacing damaged elements with certified factory-ready products that do not require post-repair testing and highly qualified repair personnel.

4. If necessary, by using electrical steel instead of amorphous alloy tape, it is possible to achieve an increase in power with the same dimensions, or a reduction in the dimensions, weight and cost of the final product with the same power as when using amorphous alloy tape.

5. The magnetic core is made with straight horizontal and shaped cuts, which makes installation manufacturable.

6. The visor is made of a plate of insulating material, which prevents the formation of a short-circuited turn when high-voltage leads pass through the visor.

Drawings shown: FIG. 1; 2; 3 (not to scale).

In fig. 1 - transformer, front view; in fig. Figure 2 shows a modular dry transformer for outdoor installation (modernized), top view, containing a frame 1, a twisted magnetic circuit 2, in the window of which the primary winding (VN) is mounted, 3 the winding of which is made of PETV-24 copper wire and interlayer insulation 5, and the secondary winding (LV) with taps from -5 to +5% 6, made of copper tape 7 and interlayer insulation 5 with insulation made of polymer materials 8 with cable entries made of mounting wire with insulation made of silicone rubber 9, wound on a frame made of polyamide polymer 10, and exit through the fitting 11, which provides sealing, connected to the trunnion 12, and the pressure plate 13. The magnetic core 2 with windings through the pressure plate 13, tightening pins 14 and nuts 15 with washers 16, between which a visor made of a plate of insulating material 17 is attached, and the entire structure is attached to the frame 1, an eyelet 18 is installed on top of the structure, instead of which a ring nut can be made to facilitate transportation of the transformer.

In fig. 3 - antzapf.

On the body 19 of the antzapf switch with holes for fastening 20, studs are mounted for connecting taps of the secondary winding (LV) 21, into which the load phase wire 22 is connected.

Information confirming the possibility of implementing the invention.

Experience based on the manufacture of a transformer according to EAPO patent No. 034945 shows the possibility

Claims (1)

the possibility of implementing the invention. In world practice, magnetic cores made of amorphous alloys are widely used, which provide a large reduction in electricity losses on transformers, but have the disadvantage of being expensive. Magnetic cores made of electrical steel are widely used in transformer construction, but they have a disadvantage compared to amorphous alloys - large no-load losses. Instead of filling the winding with an epoxy compound, which cracks in severe frosts and does not withstand prolonged solar radiation, and also instead of using heat-shrinkable tubes from Raychem, the proposed insulation of coils with windings from polymer insulating materials, including mastic and paste-like materials, thermoplastics, heat-shrinkable tubes or tapes, etc., which do not have these disadvantages and are widely used in world practice and have the advantage of low cost compared to the above-mentioned insulation methods. The proposed modular principle in transformer manufacturing coincides with the global practice of modular product design, which provides great opportunities and benefits in production, operation and repair. Recommendations for the production of an experimental series of transformers. A modular dry transformer for outdoor installation (modernized) contains primary (VN) and secondary windings (LV), which are mounted in the window of two twisted magnetic cores, made of amorphous alloys and/or electrical steel, forming an armor core. To ensure air circulation between the cores, a gap can be created that does not affect the characteristics of the magnetic core. Twisted magnetic cores made of amorphous alloy and/or electrical steel of the required size and magnetic properties are purchased from global manufacturers. To protect against corrosion, the magnetic circuit must be painted with anti-corrosion paint. The winding frames are made of polyamide polymer with vertical stiffeners on the side of the magnetic circuit, forming channels for air circulation, ensuring cooling of the windings. To ensure dynamic stability during a short circuit and reduce the amount of interlayer voltage and interlayer insulation, the windings must be wound from aluminum or copper tape in a winding manner, sealing cable entries made of mounting wire with silicone rubber insulation. The outside of the coil must be insulated with a polymer insulating material, including mastic and paste-like materials, thermoplastics, heat-shrink tube or tape, etc. In the case of insulation with a polymer heat-shrink tube, it is recommended to adhere to the technology of using these materials. The antzapf is assembled on a plate made of insulating material, fixed to the frame with screws, and the secondary winding (LV) inputs are connected to it. The pressure plate is made of non-magnetic materials and, if necessary, coated with paint and varnish. The bed is a non-magnetic material, if necessary it is covered with a paint and varnish coating. The magnetic core with windings is installed on the frame and secured with a pressure plate, tie rods, nuts and washers. The canopy is installed above the pressure plate and secured with nuts and washers on the tie rods. The eyelet can be made of a ring nut and other materials and installed on top of the visor. CLAIM Dry transformer for outdoor installation, characterized in that it contains a frame, a pressure plate with tie rods made of non-magnetic materials for fastening twisted magnetic cores, from a tape of amorphous alloys and/or electrical steel, with an upper horizontal and/or shaped cut, in the window of which are mounted, connected through an annular switch, the secondary (LV) and primary windings (VN), wound on polyamide frames, with soldered, flexible inputs of the required length, which are made of mounting wires with silicone rubber insulation, output through fittings, while the external insulation of the windings is made of polymer insulating materials. -