CN201859752U

CN201859752U - 220kV-level power transformer

Info

Publication number: CN201859752U
Application number: CN2010205932813U
Authority: CN
Inventors: 刘立忠
Original assignee: 刘立忠
Current assignee: Zhejiang Jiangshan Special Transformer Co., Ltd.
Priority date: 2010-10-23
Filing date: 2010-10-23
Publication date: 2011-06-08
Anticipated expiration: 2020-10-23

Abstract

A 220kV-level power transformer comprises an iron core, a coil wound on the iron core and a transformer lead. The 220kV-level power transformer is characterized in that the tap of the coil and the transformer lead are connected by a cold-pressing joint. The 220kV-level power transformer is simple in structure and firm and convenient for connection, has large conducting contact area and less resistance, can lower the partial discharge capacity, avoid pollution to the body of the transformer and prolong the service life of the transformer.

Description

220kV grade power transformer

Technical field

The utility model relates to a kind of piezoelectric transformer, especially relates to a kind of power transformer with the cold weld lead-in wire.

Background technology

The high-low pressure lead-in wire of existing 220kV grade power transformer adopts phosphor-copper weldering or hydrogen arc welding, when welding, cools off in the transformer coil tap with the moist wrapping of asbestos cord usually.Because winding wire is metal, be the good conductor of heat, so during welding near the turn insulation the winding protruding head by unavoidably destroyed; Produce local overheating when welding, not only make weld lead annealing on every side, weld is fragility, mechanical strength reduces, the time cracking phenomena is arranged, its heat conduction also can damage transformer insulated performance, and weld exists burr, unfilled corner, can cause partial discharge during the transformer operation.Can produce welding slag, metal carbide in the welding process, unavoidably can make the part material enter the device body in its removal process, a part of material becomes the impurity in the oil behind device body immersion oil, served as the medium of oil puncture " foot bridge theory "; Another part is attached to aggravating partial discharge between master, longitudinal insulation.Welding process is used asbestos putty, and this material is not easy whole removals, can become the impurity in the oil behind device body immersion oil equally, serves as the medium in " foot bridge theory ".For reducing phosphor-copper weldering or hydrogen arc welding procedure, often need higher technical ability and the quality mind of transformer assembling worker to the quality problems that transformer produces.

The utility model content

The purpose of this utility model is in order to solve above-mentioned the deficiencies in the prior art, a kind of technical scheme is provided, the pigtail splice structure of this transformer is simpler, it is firm, convenient to connect, conductive contact surfaces is long-pending bigger, and resistance is less, can reduce the partial discharge of transformer amount, can not produce pollution, prolong the useful life of transformer transformer body.

The technical scheme that technical problem adopted that the utility model solves is: 220kV grade power transformer, comprise iron core, coil and transformer lead on the iron core, and it is characterized in that the tap of coil adopts the joint of colding pressing to be connected with transformer lead.

The joint of colding pressing is the cylinder that two ends have the circle of band jack respectively.When adopting cold weld technology, clean the insulating barrier and the oil removal of the tap of coil and transformer lead conductive line surfaces, then with two wire head centrings that need crimping, on same axle, pull the handle of Press Plier at normal temperatures with hand, according to the specification of the joint of colding pressing, press to get final product for several times.Material according to coil and transformer lead is different, selects the corresponding joint of colding pressing for use.Copper one bronze medal, aluminium one aluminum conductor and aluminium one copper conductor can be selected copper one bronze medal, aluminium one aluminum conductor and the aluminium one bronze medal joint of colding pressing respectively for use.

The utility model is because lead-in wire has adopted the joint of colding pressing, the joint is solid and reliable, and electric conductivity and mechanical strength all are better than existing welding method, easy to operate during connection, the efficient height, stopped the generation of problems such as insulation damages that welding may cause and transformer body be unclean again, the joint of colding pressing is smooth, no wedge angle, no burr, partial discharge quantity reduces greatly, favourable prolongation transformer useful life, the employing joint flames of anger of colding pressing can not damage insulation, need not with moist asbestos cord cooling, the insulation property of transformer body have been guaranteed, transformer body needn't advance drying room and carry out drying once more, has shortened the processing cycle, has reduced cost.

The beneficial effects of the utility model are: structure is simpler, and it is firm, convenient to connect, and conductive contact surfaces is long-pending bigger, and resistance is less, can reduce the partial discharge of transformer amount, can not produce the pollution to transformer body, prolongs the useful life of transformer.

Description of drawings

Below in conjunction with drawings and Examples utility model is further specified.

Fig. 1 is the contour structures schematic diagram of the utility model embodiment.

Fig. 2 is the structure of transformer body schematic diagram of the utility model embodiment.

Fig. 3 is the coil tap of the utility model embodiment and the cold weld header structure schematic diagram of transformer lead tap.

Among the figure: 1, fuel tank 2, low-tension bushing 3, bushing 4, transformer oil 5, coil 6, transformer lead 7, the joint 8 of colding pressing, coil tap 9, lead-in wire tap

Embodiment

As shown in Figure 1, present embodiment is a 220kV grade three-phase oil-immersed power transformer, comprises fuel tank 1 casing.The lead-out wires of coil of transformer body is drawn out to the outside by bushing 3, low-tension bushing 2 and shunting switch respectively.The effect of bushing shell for transformer is the inner high and low pressure of transformer to be guided to fuel tank 1 outside, not only conduct lead-in wire insulation against ground, and the effect of undertaking anchor leg.In the oil tank of transformer 1 is transformer body, and transformer body is immersed in the transformer oil 4.

As shown in Figure 2, transformer body comprises iron core, coil 5 and transformer lead 6 on the iron core, and the tap of coil adopts the joint of colding pressing to be connected with transformer lead.

As shown in Figure 3, the joint 7 of colding pressing is cylinders of circle that two ends have the band jack respectively.When adopting cold weld technology, clean the insulating barrier and the oil removal of coil tap 8 and transformer lead tap 9 conductive line surfaces, then with two wire head centrings that need crimping, on same axle, pull the handle of Press Plier at normal temperatures with hand, according to the specification of the joint 7 of colding pressing, press to get final product for several times.

Claims

1.220kV the grade power transformer relates to a kind of power transformer with cold weld lead-in wire, comprises iron core, coil and transformer lead on the iron core, it is characterized in that the tap of coil adopts the joint of colding pressing to be connected with transformer lead.