CN2295268Y

CN2295268Y - High-impedance power transformer

Info

Publication number: CN2295268Y
Application number: CN 97217819
Authority: CN
Inventors: 唐宗贵; 郑体珍
Original assignee: HARBIN TRANSFORMER FACTORY
Current assignee: HARBIN TRANSFORMER FACTORY
Priority date: 1997-05-06
Filing date: 1997-05-06
Publication date: 1998-10-21
Anticipated expiration: 2007-05-06

Abstract

The utility model relates to a high resistance electric power resisting voltage changing device and is composed of a shell body 1 and a device body. The side of the inner diameter of a low voltage coil 5 is provided with a hard paper barrel 10 rolled into by a very hard paper plate, and a magnetic shield plate 22 is arranged in an upper limber plate 13. A steel pressing plate 18 corresponding to an empty path between a high voltage coil 4 and the low voltage coil 5 is provided with a discontinuity groove 24, and the inner wall of the shell body is provided with an electric shield plate 2 made of an aluminum plate. A pulling plate 7 is provided with a long hole 25, and an inner oil guiding separating plate 8 and an outer oil guiding separating plate 9 are arranged between the line cake of the high voltage and low voltage coils. The high resistance electric power resisting voltage changing device has the strong short circuit resisting capability and can ensure that the voltage changing device runs safely in the existing and developing electric nets. The fault can not be caused because of the short circuit.

Description

High-impedance electric power transformer

High-impedance electric power transformer belongs to power transmission and transforming equipment.

In recent years, along with developing rapidly of China's electric utility, net capacity constantly increases, the short-circuit impedance of system is than reducing by a relatively large margin several years ago arranged, a same transformer moves in big electrical network, the short-circuit force that produces during its short circuit will increase, and the anti-short circuit capability of transformer is weakened, and the transformer of normal impedance can not satisfy the requirement of safe and reliable operation in electrical network.In recent years, transformer often took place because of bearing the accident that sudden short circuit power is damaged down.

The purpose of this utility model is a kind of high-impedance electric power transformer of development, and this power transformer self has the ability of very strong Short Circuit withstand power, can safe operation in the electrical network of existing and development to guarantee transformer.

The utility model at first is the ability that will solve transformer Short Circuit withstand power, solves structure loss that the high leakage field produce owing to high impedance causes and the local overheating problem that is caused by the structure loss then.Therefore, the utility model has been taked following several measures.One, for improving the ability of Short Circuit withstand power, at the low-voltage coil internal side diameter cardboard cylinder made from the ultrahard cardboard is set and supports.Two, on the upper limbs plate of iron core lower clamping piece, install magnetic shield panel additional, to reduce the dispersion loss of leakage field at this place.Three, for reduce the dispersion loss that end winding produces in keeper plate of steel, at the disconnected groove of position, the empty road standard width of a room in an old-style house between corresponding high-voltage coil and low-voltage coil on the keeper plate of steel.Four, for reducing the structure loss that produces on the housing wall and prevent that housing from producing local overheating, the electric screen of making by aluminium sheet in the inner walls setting.Five, because the iron core arm-tie is in high leakage field place, and radiating condition is poor.For reducing dispersion loss and the local overheating that arm-tie produces, open slotted hole at the height position of the corresponding coil of arm-tie, thereby circulation (eddy current that the electromagnetic induction goes out) cross section that arm-tie is produced in high leakage field district reduces, dispersion loss is reduced, thus the local overheating of avoiding.Six, for improving the radiating condition of coil inside, prevent local overheating, in high-voltage coil and low-voltage coil, installing additional in the Oil Guide dividing plate with outside the Oil Guide dividing plate.

Impedance voltage value of the present utility model is higher than the regulation of national GB 6451.1-5-86 standard, and no-load loss or total losses index reach GB 6451.1-5-86 standard, satisfies the performance requirement of energy saving transformer.High-impedance electric power transformer has improved the ability of its Short Circuit withstand power in electrical network, helps transformer safe and reliable operation in electrical network.In the electrical network as adopt high-impedance electric power transformer, can reduce in the electrical network protective device to transformer.As to adopt an impedance be the high-impedance transformer of 21.5% SFZ 7-31500/63, can save 300,000 yuan/platform of reactor product cost, saves 80,000 yuan/year of reactor operating costs, saved the maintenance cost of reactor and the institute of reactor simultaneously and taken up space.Especially reduced because transformer because of the anti-short circuit capability difference causes fault, makes electrical appliance damage the big loss of tool that causes.

Fig. 1 is the utility model outline drawing, Fig. 2 is the N-N cutaway view of Fig. 1, and Fig. 3 is the M-M cutaway view of Fig. 1, and Fig. 4 is a structural representation of opening slotted hole on the arm-tie, Fig. 5 is the structural representation of standard width of a room in an old-style house fault trough on the pressing plate, and Fig. 6 is the structural representation that adds magnetic shield panel in the upper limbs plate of lower clamping piece.

Embodiment: present embodiment is made up of housing 1, device body.Housing 1 is welded by steel plate, it is coated on the outside of device body, with device body and air insulated, it plays the effect of dress transformer oil again, for reducing the structure loss and preventing the housing local overheating, the electric screen of being made by aluminium sheet 2 is set on inner walls, electric screen 2 is identical by four block sizes, contour with A, B phase coil, and be arranged in the housing of A, B phase coil both sides and another piece is enclosed in the housing rear wall The shape plate is formed,

The shape plate is with the three ends sealing of C phase coil.The device body by upper limbs plate 13, soft paper web 14,

end circle

15,17, keeper plate of steel 18, the upper clamping piece 19 of iron core 3, high-tension coil 4, low-voltage coil 5, voltage regulation coil 6, arm-tie 7, interior Oil Guide dividing plate 8, outer Oil Guide dividing plate 9, cardboard cylinder 10, pad pin 11, lower clamping piece 12, lower clamping piece, put the beams in place 20, protect frame 21, magnetic shield panel 22 is formed.Iron core 3 is formed by the silicon steel sheet stack, forms rigid frame by lower clamping piece 12, upper clamping piece 19, upper beam 20, pad pin 11, arm-tie 7, and iron core 3 is clamped and form a rigidity integral body.Between high-tension coil 4, low-voltage coil 5, voltage regulation coil 6, isolate with soft paper web 14.Oil Guide dividing plate 8, outer Oil Guide dividing plate 9 in the compartment of terrain is provided with respectively between the cake of line separately of low-voltage coil 5 and high-tension coil 4.Being provided with the cardboard cylinder 10 that is rolled by the ultrahard cardboard at the internal side diameter of low-voltage coil 5 supports.High-tension coil 4, low-voltage coil 5, voltage regulation coil 6 filled by

end circle

15,17 to the insulation distance of iron core yoke, by keeper plate of steel 18 coil compressed again.Install magnetic shield panel 22 additional in the upper limbs plate 13 of lower clamping piece 12, magnetic shield panel 22 is fixed on protecting in the frame 21 of upper limbs plate 13 by insulated bolt 23.At the deep-slotted chip breaker 24 that has interruption on the keeper plate of steel 18 corresponding to the position, empty road between the high-voltage coil and low-voltage coil 4,5.Corresponding high-voltage coil and low-

voltage coil

4,5 on the arm-tie 7 go to the bottom and on the top between the position have slotted hole 25, slotted hole 25 is positioned at the centre of arm-tie 7.

Claims

1, high-impedance electric power transformer, it is made up of housing (1), device body, the device body is made up of iron core (3), high-tension coil (4), low-voltage coil (5), voltage regulation coil (6), arm-tie (7), pad pin (11), lower clamping piece (12), the upper limbs plate (13) of lower clamping piece, soft paper web (14), end circle (15), (17), keeper plate of steel (18), upper clamping piece (19), put the beams in place (20), it is characterized in that internal side diameter at low-voltage coil (5) is provided with the cardboard cylinder (10) that is rolled by the ultrahard cardboard and supports.

2, high-impedance electric power transformer according to claim 1 is characterized in that installing magnetic shield panel (22) additional in the upper limbs plate (13) of lower clamping piece (12), and magnetic shield panel (22) is fixed on protecting in the frame (21) of upper limbs plate (13) by insulated bolt (23).

3, high-impedance electric power transformer according to claim 1 is characterized in that going up the arc groove (24) that has interruption corresponding to the position, empty road between high-tension coil (4), the low-voltage coil (5) at keeper plate of steel (18).

4, high-impedance electric power transformer according to claim 1, it is characterized in that on the inwall of housing (1), being provided with the electric screen of making by aluminium sheet (2), electric screen (2) is identical by four block sizes, contour with A, B phase coil, and be arranged in the housing (1) of two of A, B phase coil and another piece is enclosed in housing (1) rear wall

The shape plate is formed,

The shape plate is with the three ends sealing of C phase coil.

5, high-impedance electric power transformer according to claim 1 is characterized in that arm-tie (7) goes up that the position has slotted hole (25) between going to the bottom of corresponding high-voltage coil and low-voltage coil (4), (5) and the last top, and slotted hole (25) is positioned at the centre of arm-tie (7).

6, high-impedance electric power transformer according to claim 1 is characterized in that Oil Guide dividing plate (8) in the compartment of terrain is provided with respectively between the cake of line separately of high-tension coil (4) and low-voltage coil (5), outer Oil Guide dividing plate (9).