CN201966038U - Transformer in compound combined electrical apparatus - Google Patents

Abstract

The utility model relates to a transformer in an integrated and miniaturized composite combined electric appliance, which is especially suitable for a substation in the form of load end line-transformer group wiring. It includes bushing, fuel tank, winding, iron core and device body; shock-absorbing foot pads are set at the connection between the iron core and the fuel tank; the tank cover and tank wall of the fuel tank are welded with reinforcing iron; the winding adopts an inner screen continuous coil, and the winding input method is The end enters the wire, and the coil is a combined wire. The utility model can fully withstand the destructiveness caused by the sudden short circuit of the system; the noise of the transformer is reduced, the shock resistance of the transformer is strengthened, and oil leakage of the transformer is effectively prevented.

Description

Transformer in composite combined electric appliance

technical field

The utility model relates to a high-voltage electrical equipment, in particular to a transformer in an integrated and miniaturized composite combined electrical appliance, and is especially suitable for a substation in the form of load terminal line-transformer group wiring.

Background technique

With the development of the power grid, the miniaturization and intelligentization of substation construction is an inevitable trend of development. Especially in urban or urban fringe areas, the land resources for building substations are becoming more and more scarce. The national power system is facing the same problem, that is, the construction of substations. land acquisition difficulties.

However, in the prior art, since there are many types of substation equipment, and there must be sufficient electrical distances and transportation passages between the electrical equipment according to the design regulations, the occupied area is relatively large. In addition, in the construction of conventional indoor substations, all high-voltage equipment is indoors, and 66kV switches, transformers, isolating switches and other equipment need to be arranged on the second floor, so the building area is relatively large, and the load-bearing issue of the house must also be considered. Therefore, many difficulties have been brought to the construction of substations. In order to reduce the floor area, the requirements for transformers are getting higher and higher, and the transformers in the prior art have poor ability to withstand the destructive ability caused by sudden short circuit of the system, and the transformers have large noise, anti-seismic ability and oil leakage prevention effect. Neither is ideal.

Contents of the invention

The utility model aims at the problems existing in the above-mentioned prior art, and after a large amount of exploration and research and test summary, it provides a transformer in a composite combined electrical appliance, which solves the damage caused by the sudden short circuit of the transformer bearing system in the prior art The problem of poor performance, and the utility model improves the anti-seismic ability and oil leakage prevention effect, and reduces the noise.

The technical scheme of the utility model is as follows:

Including bushing, fuel tank, winding, iron core and device body; shock-absorbing foot pads are set at the connection between the iron core and the fuel tank; the tank cover and tank wall of the fuel tank are welded with reinforcing iron; The inner part of the wire, the coil is a combined wire; the body is equipped with a 50-60mm thick full-circle pressure plate structure, and the winding outside the iron window is equipped with a semi-circular secondary pressure plate with the same thickness as the pressure plate.

The windings wound by the combined wires adopt three standard transpositions, and the wires at the transpositions of the "S" bends of the windings are flat-pulled transpositions.

The oil-gas bushing is used to go up the line vertically, and it is connected with the switchgear. The connection part is protected by a bellows and filled with SF6 gas.

Advantage of the utility model and beneficial effect are as follows:

1. The iron core adopts high magnetic permeability and low loss 120 silicon steel sheet and improves the structure, which can reduce the magnetic density of the iron core, reduce the magnetostriction and noise; the lower yoke of the iron core adopts step-by-step reliable support to prevent the transformer from running for a long time or being impacted by a short circuit The fall of the yoke under the iron core.

2. The application of combined wire can greatly reduce the proportion of insulating material in the width dimension of the wire cake, reduce the shrinkage of the winding after drying, and ensure the tightness of the winding. The winding made of combined wires adopts three standard transpositions. This transposition method can reduce the magnetic leakage voltage difference between the transposed wires and the winding unit wires to 1/3 of that of ordinary single transpositions, ensuring that the internal Insulation safety between parallel winding units. The wires at the position of the "S" bend of the winding are changed by flat pulling to avoid the scissors formed by the upper and lower height differences from aggravating the insulation damage to the turns; the "S" bend is padded with a 0.5mm protective paper slot to strengthen the "S" Insulate the turns at the transition of the "bend"; and wrap 2 layers of Dennisone paper with a heat resistance grade of F grade on the "S" bend, because the temperature resistance grade of Dennisone corrugated paper is much higher than that of ordinary A grade insulation materials , thus ensuring that the "S" turn insulation will not break under mechanical impact after thermal aging.

3. The interior of the transformer body is fixed in multiple directions, and a pressure plate and an auxiliary pressure plate are set, which solves the hidden danger of insufficient strength of the pressure plate at the end, and effectively prevents relative displacement during transportation vibration and short circuit during operation, and improves the shock resistance; at the same time, Improve the mechanical connection between the body and the fuel tank to reduce the transmission of core noise from the inside to the outside.

4. The transformer adopts oil-gas bushing to go up vertically, and is connected to the switchgear. The connection part is protected by bellows and filled with SF6 gas.

5. By thickening the thickness of the tank wall and other structures, the resonance of the tank wall is reduced.

6. The interface flanges on the box cover and the box wall adopt blind holes, and the flanges are rigidly connected to prevent oil leakage from flange screw holes and sealing surfaces.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Among the figure, 1, oil conservator, 2, rising seat, 3, radiator, 4, oil tank, 5, base, 6, bushing, 7, fan.

Detailed ways

Referring to the accompanying drawings, in conjunction with specific embodiments, the structure of the utility model is specifically described as follows.

Example

Including casing, oil tank, winding, iron core and body; full vacuum oil injection; iron core with high magnetic permeability and low

The loss is 120 silicon steel sheets; the lower yoke of the iron core is supported step by step; the coil paper tube is made of 5mm thick Weidmante cardboard, and the high-voltage winding adopts the continuous coil of the inner screen; the pad is processed after three times of tight pressing; the winding The wire entry method is end entry. The coil copper wire adopts a semi-hard copper wire with a yield strength greater than 160, and a combined wire is selected. The winding made of the combined wire adopts three standard transpositions, and the wire at the "S" bend transposition of the winding is Pull and transpose, add a 0.5mm protective paper slot to the "S" bend, and add a 0.5mm protective paper slot to strengthen the insulation of the "S" bend transition; and add a package on the "S" bend with a heat-resistant grade of F Dennis pine paper half-stack 2-ply. The interior of the body is fixed at 13 points in multiple directions; the top and bottom of the body adopt a 50-60mm thick full-circle pressure plate structure, and there is a semi-circular secondary pressure plate with the same thickness as the pressure plate in the winding part outside the iron window, and all pads and end rings are not spliced; The gap between the coils and between the coil and the iron core is close to zero; the steel plate of the fuel tank is thickened, the tank cover and the tank wall are welded with reinforced iron, and the interface flanges on the tank cover and the tank wall are all blind holes; all internal steel parts require full welding, External reinforced iron adopts CO2 gas shielded welding. The clamp is made of non-magnetic steel plate 20Mn23Al, and the mounting flange of the high-current low-voltage bushing is made of non-magnetic steel plate 20Mn23Al. The terminal connecting the high-voltage lead wire and the bushing is silver-plated, and the tap lead is cold-rolled and welded; the connection between the low-voltage copper bar and the bushing is connected by soft copper strips; the clamping of the high-current lead is made of electrical laminated wood, and tight The firmware uses high-strength phenolic bolts and nuts.

Claims (3)

1. A transformer in a composite combined electrical appliance, comprising a bushing, an oil tank, a winding, an iron core and a device body; it is characterized in that a shock-absorbing foot pad is arranged at the joint between the iron core and the oil tank; the tank cover and the tank wall of the oil tank are welded with reinforced iron ;The winding adopts the continuous coil of the inner screen, the winding way is the end of the wire, and the coil is a combined wire; the body is equipped with a 50-60mm thick full-circle pressure plate structure, and the outer winding of the iron window is equipped with a semi-circular secondary pressure plate with the same thickness as the pressure plate. 2. The transformer in the composite combined electrical appliance according to claim 1, characterized in that the windings wound by the combined wires adopt three standard transpositions, and the wires at the transpositions of the "S" bends of the windings are flat-pulled transpositions. 3. The transformer in the composite combined electrical appliance according to claim 1, characterized in that oil-gas bushings are used to lead vertically upwards to connect with the switchgear, the connection parts are protected by bellows, and the interior is filled with SF6 gas.

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