CN101425366A

CN101425366A - Dry power transformer

Info

Publication number: CN101425366A
Application number: CNA2008100219352A
Authority: CN
Inventors: 高雄鹰; 朱滨
Original assignee: YANGZHOU HUADING ELECTRIC CO Ltd
Current assignee: YANGZHOU HUADING ELECTRIC CO Ltd
Priority date: 2008-08-08
Filing date: 2008-08-08
Publication date: 2009-05-06

Abstract

The invention relates to a dry-type electric power transformer and belongs to the technical field of transformers. The invention improves the structure of the prior dry-type electric power transformer and is characterized in that each phase winding of a high voltage winding consists of two independent windings of an upper winding and a lower winding, and the upper winding is separated from the lower winding by an insulating pad into two independent upper and lower windings of 10KV. By changing the structure of the high-voltage winding, the invention does not affect the mechanical and electrical performances of products, and plays a connecting role during the transformation of the transition from a 10KV power grid to a 20KV power grid; primary side voltage of the 10KV power grid and the 20KV power grid can be freely switched, without any effect on the secondary side; compared with a 10KV transformer, the invention increases the power supply capacity, ensures the voltage quality, reduces the electric energy loss of the power grid and saves the construction cost of the power grid, and the invention has all the functions of a 20KV transformer simultaneously and is well in line with the distribution of the town power grid.

Description

Dry-type power transformer

Technical field

The present invention relates to a kind of dry-type power transformer, especially the 20KV dry-type power transformer belongs to the transformer technology field.

Background technology

The high pressure winding of existing 10KV, 20KV dry-type power transformer is the globality structure.Transmission of 10KV electrical network and limited coverage area, 20KV is a newly-increased voltage in the electrical network, one-time construction electric substation expense is huge, and is very uneconomical.

Summary of the invention

The objective of the invention is the dry-type power transformer above shortcomings that adopted in existing 10KV electrical network, the 20KV electrical network, provide primary side voltage freely to switch, secondary side is not affected, compare with existing 10KV power transformer increased power supply capacity, guaranteed quality of voltage, reduced the electric energy loss of electrical network, the construction cost of saving electrical network, also possess simultaneously a kind of dry-type power transformer of all functions of 20KV transformer, help meeting the distribution of urban power grid.

The objective of the invention is to be achieved through the following technical solutions, a kind of dry-type power transformer, comprise iron core, iron core is outward low pressure winding, high pressure winding successively, the every phase winding that it is characterized in that described high pressure winding by up and down two independently winding forms, separate with cross-over block between the winding up and down, every phase is winding terminal relative up and down, the tap lead of winding connects two, three layers of lug plate separately respectively up and down, and the ground floor lug plate is used for the in parallel or series connection of two groups of windings up and down.

The width of cloth of each winding is identical to, axial dimension.

The tap lead of winding is four lines up and down, and correspondence connects two, three layers of lug plate separately and forms three gears respectively.

In parallel or the series connection of described two groups of windings up and down, when the transformer high-voltage winding is delta connection, in the wiring of ground floor lug plate, phase lead riser A, the A ' correspondence of winding up and down meets ground floor lug plate A, A ', and phase lead-in wire tail X1, the X1 ' correspondence of winding up and down meets ground floor lug plate X1, X1 ', when being connected to A, A ' time, winding A, X1, A ', X1 ' parallel running are when being connected to A ', X1, winding A, X1, A ', X1 ' series operation.

The present invention is the improvement to existing dry-type power transformer structure, utilizing 20KV just in time is the twice of 10KV voltage, the relation of utilizing the voltage ratio and the number of turn to be directly proportional, be divided into up and down two independently 10KV windings, the centre is an iron core, iron core is outward the low pressure winding successively, the high pressure winding, adopt non-circular structure, by changing the high pressure winding construction, at the machinery that does not influence product, on the basis of electric property, by in the fuel tank internal wiring, this structure can not influence the mechanical strength and the electric property of product, and, play a part to form a connecting link at the 10KV electrical network in 20KV electrical network transition transformation process, 10KV and 20KV primary side voltage can freely switch, secondary side is not affected, comparing with 10KV has increased power supply capacity, guarantee quality of voltage, reduce the electric energy loss of electrical network, save the construction cost of electrical network, also possessed all functions of 20KV transformer simultaneously, meet the distribution of urban power grid more.

Description of drawings

Fig. 1 is the present invention's one phase cross section structure schematic diagram;

Fig. 2 is a high pressure winding construction schematic diagram of the present invention;

Fig. 3 during for three-phase operation of the present invention in the delta connection high pressure winding of a phase state and with the annexation figure of lug plate;

Among the figure, 1 iron core, 2 low pressure windings, 3 high pressure windings, 4 cross-over blocks, A, A ' are the lead riser of up and down winding and the corresponding joints of lug plate, X1, X1 ' be about the corresponding joints of winding leads tail and lug plate, X2, X3, X4, X5 are the tap lead of winding up and down, X2, X3, X4, X5, X2 ', X3 ', X4 ', X5 ' lug plate.

Embodiment

Further specify the present invention in conjunction with the accompanying drawings and embodiments, as shown in Figure 1 and Figure 2, the present invention is by iron core 1, low pressure winding 2, high pressure winding 3, cross-over block 4 and lug plate constitute, the high pressure winding 3 of every phase by up and down two independently winding form, separate with cross-over block 4 between the winding up and down, the end of every phase two windings relatively.

As shown in Figure 3, in parallel or the series connection of two groups of windings up and down is when the transformer high-voltage winding is delta connection, in the wiring of ground floor lug plate, one phase lead riser A, the A ' correspondence of winding up and down meets ground floor lug plate A, A ', one phase lead-in wire tail X1, the X1 ' correspondence of winding up and down meets ground floor lug plate X1, X1 ', when being connected to A, A ' time, winding A, X1, A ', X1 ' parallel running, when being connected to A ', X1, winding A, X1, A ', X1 ' series operation.

The tap lead of last winding is four lines, and promptly corresponding respectively lug plate X2, X3, X4, the X5 that connects the second layer of X2, X3, X4, X5 forms three gears; Corresponding respectively lug plate X2 ', X3 ', X4 ', X5 ' formation three gears that connect the 3rd layer of tap lead X2, the X3 of following winding, X4, X5.

Claims

1, a kind of dry-type power transformer, comprise iron core, iron core is outward low pressure winding, high pressure winding successively, the every phase winding that it is characterized in that described high pressure winding by up and down two independently winding form, separate with cross-over block between the winding up and down, every phase is winding relatively terminal up and down, and the tap lead of winding connects two, three layers of lug plate separately respectively up and down, and the ground floor lug plate is used for the in parallel or series connection of two groups of windings up and down.

2, dry-type power transformer according to claim 1, the width of cloth that it is characterized in that each winding is identical to, axial dimension.

3, dry-type power transformer according to claim 1 is characterized in that the tap lead of winding is four lines up and down, and correspondence connects two, three layers of lug plate separately and forms three gears respectively.

4, dry-type power transformer according to claim 1, it is characterized in that the in parallel or series connection of described two groups of windings up and down, when the transformer high-voltage winding is delta connection, in the wiring of ground floor lug plate, one phase lead riser A, the A ' correspondence of winding up and down meets ground floor lug plate A, A ', one phase lead-in wire tail X1, the X1 ' correspondence of winding up and down meets ground floor lug plate X1, X1 ', when being connected to A, A ' time, winding A, X1, A ', X1 ' parallel running, when being connected to A ', X1, winding A, X1, A ', X1 ' series operation.