CN201181632Y

CN201181632Y - Multi-column parallel connection high-voltage winding outgoing line structure

Info

Publication number: CN201181632Y
Application number: CNU2008200288907U
Authority: CN
Inventors: 谢庆峰; 韩晓东; 孟丽坤
Original assignee: China XD Electric Co Ltd
Current assignee: China XD Electric Co Ltd
Priority date: 2008-04-21
Filing date: 2008-04-21
Publication date: 2009-01-14
Anticipated expiration: 2018-04-21

Abstract

The utility model provides an offtrack structure of a high-voltage winding connected by a plurality of columns in parallel for solving the problem that the electrical insulation intensity and the safe reliability of the existing ultra-high voltage and extra-high voltage transformers can not meet the requirements on the conveying size. The utility model includes n high-voltage windings arranged in a line in the oil cylinder of the transformer; the n is equal to or more than 2; the two high-voltage windings at the outmost side are respectively a first high-voltage winding at the outmost side and a second high-voltage winding outmost side; the utility model is characterized in that each high-voltage winding is not independently led out; the outgoing lines of each high-voltage winding are connected in parallel through a balance tube and can be led to the exit side A[1] of the first high-voltage winding at the outmost side or to the exit side An of the second high-voltage winding at the outmost side; the exit side A[1] or An is connected to a high-voltage bushing and led out through a direct offtrack device in the oil cylinder, or can be led to the exit side A[1], A[2]..., A[n] of any high-voltage winding and is connected to the high-voltage bushing and led out through an indirect offtrack device outside the oil cylinder.

Description

Multicolumn parallel high voltage winding outlet structure

Technical field

The utility model relates to a kind of transformer outlet structure, particularly a kind of outlet structure of super, extra-high voltage transformer high pressure winding.

Background technology

Super high-pressure single phase transformer capacity is big, generally adopts single-phase three pillar type structure, and winding is sleeved on the body center pillar.For the huge transformer of big capacity, the core-diameter of this kind structure is big, the height height of last lower yoke, under identical shipping height condition, need to reduce the winding height and could satisfy transportation clearance, and the winding height is little, electric field strength along axis of winding is big, vertical dielectric strength is reduced, and the lightning impulse resistant ability is relatively poor, and security performance reduces, the winding radial dimension is big simultaneously, the highly low leakage flux density that can increase winding, the loss of winding conducting wire and hardware is big, is unfavorable for preventing local overheating.And the increase of winding temperature rise of hot spot also can influence the safe and reliable operation of transformer.When transformer capacity was big, this structure width was big, transported easily restricted.

Summary of the invention

The utility model is existing super in order to improve, the electric insulation intensity of ultra high voltage high-power transformer, property safe and reliable to operation, and can satisfy the problem that the transportation gauge requires, and the outlet structure of a kind of surpassing newly, extra-high voltage transformer high pressure winding is provided.

For reaching above purpose, the utility model takes following technical scheme to be achieved:

A kind of multicolumn parallel high voltage winding outlet structure, comprise n the high pressure winding in one line that is arranged in the oil tank of transformer, described n 〉=2, its outermost two high pressure windings are respectively the first outside high pressure winding, the second outside high pressure winding, it is characterized in that, each high pressure winding is not drawn separately, by the balance pipe parallel connection, can select to cause each exit A of first to the second outside high pressure winding between the lead-out wire of each high pressure winding ₁, A ₂..., A _nArbitrary end; Exit A ₁Or An is connected to bushing by the outer indirect outgoing line device of the direct outgoing line device in the fuel tank or fuel tank and draws; Exit A ₂, A ₃..., A _N-1One of be connected to bushing by the outer indirect outgoing line device of fuel tank and draw.

The utlity model has following advantage:

1. satisfy the high requirement of insulation level.The multicolumn core-diameter reduces, and umber of turn increases, and impacts and main insulation, and the upper and lower side dielectric strength increases.Can satisfy 330kV, 500kV, 750kV, 1000kV so that the insulating requirements of 1700kV and above electric pressure product.

2. the product no-load performance is good.The structure that a plurality of principal post windings are in parallel can be ellipse or approximate ellipsoidal in the shaped design that satisfies under transportation condition and the high pressure winding height condition the iron yoke, and the magnetic flux density in the main transformer is constant, thereby can improve the no-load performance of product.

3. many structures that the principal post winding is in parallel, every column capacity is little, and device body leakage field reduces, and winding eddy current loss reduces, and hardware stray loss reduces, and has avoided the generation of local overheating phenomenon, increases the operational reliability of product.

4. many structures that the principal post winding is in parallel, core-diameter is little, and iron yoke height is little, and transformer can satisfy the requirement of the outer limit of transportation.

Description of drawings

The utility model is described in further detail below in conjunction with drawings and Examples.

Fig. 1 is the utility model high pressure winding outlet structure schematic diagram.Among the figure: 1, the first outside high pressure winding; 2,3 ..., the high pressure winding between n-1 two outside windings; N, the second outside high pressure winding; 101, oil tank of transformer; 102, direct outgoing line device; 103, balance pipe; 104, indirect outgoing line device.

Fig. 2 is the schematic diagram that is electrically connected for Fig. 1 outlet structure.Among the figure: A ₁, A ₂..., A _n, each exit of first to the second outside high pressure winding; X, neutral point.

Fig. 3 is the outlet structure schematic diagram of the utility model embodiment 1.

Fig. 4 is the schematic diagram that is electrically connected of Fig. 3 outlet structure.

Fig. 5 is the outlet structure schematic diagram of the utility model embodiment 2.

Fig. 6 is the schematic diagram that is electrically connected of Fig. 5 outlet structure.

Embodiment

Embodiment 1:

Referring to Fig. 3, Fig. 4, a kind of three post parallel high voltage winding outlet structures, comprise 3 high pressure windings in one

line

1,2,3 that are arranged in the oil tank of transformer 101, its outermost two high pressure windings are respectively the first outside high pressure winding 1, the second outside high pressure winding 3, between two

high pressure windings

1,2,2, do not draw separately between 3, pass through balance pipe 103 parallel connections between the outlet of each high pressure winding, and cause the exit A of the first outside high pressure winding 1 ₁Or cause the exit A of the second outside high pressure winding 3 ₃, exit A ₁Or A ₃Connect direct outgoing line device 102 in the fuel tank 101.

According to transformer external insulation distance and external module deployment scenarios, the outlet between each high pressure winding also can be from the exit A of high pressure winding 1,2,3 after by balance pipe 103 parallel connections ₁, A ₂, A ₃In arbitrary terminal draw, and be connected to fuel tank outer room leading-out wire device 104.

Embodiment 2

Referring to Fig. 5, Fig. 6, a kind of four post parallel high voltage winding outlet structures, comprise 4 high pressure windings in one

line

1,2,3,4 that are arranged in the oil tank of transformer 101, its outermost two high pressure windings are respectively the first outside high pressure winding 1, the second outside high pressure winding 4, between two

high pressure windings

1,2, between 2,3, not independent lead-out wire between 3,4, pass through balance pipe 103 parallel connections between the outlet of each high pressure winding, and cause the exit A of the first outside high pressure winding 1 ₁Or cause the exit A of the second outside high pressure winding 4 ₄, exit A ₁Or A ₄Connect direct outgoing line device 102 in the fuel tank 101.

According to transformer external insulation distance and external module deployment scenarios, the lead-out wire between each high pressure winding also can be selected from the exit A of high pressure winding 1,2,3,4 after by balance pipe 103 parallel connections ₁, A ₂, A ₃, A ₄In arbitrary terminal draw, and be connected to fuel tank outer room leading-out wire device 104.

Claims

1. multicolumn parallel high voltage winding outlet structure, comprise n the high pressure winding in one line that is arranged in the oil tank of transformer, described n 〉=2, its outermost two high pressure windings are respectively the first outside high pressure winding, the second outside high pressure winding, it is characterized in that, each high pressure winding is not drawn separately, by the balance pipe parallel connection, can select to cause each exit A of first to the second outside high pressure winding between the lead-out wire of each high pressure winding ₁, A ₂..., A _nArbitrary end; The exit A of the first outside high pressure winding ₁Or the exit An of the second outside high pressure winding is connected to bushing by the outer indirect outgoing line device of the direct outgoing line device in the fuel tank or fuel tank and draws; The exit A of each the high pressure winding between first and second outside high pressure winding ₂, A ₃..., A _N-1One of be connected to bushing by the outer indirect outgoing line device of fuel tank and draw.

2. multicolumn parallel high voltage winding outlet structure according to claim 1 is characterized in that described n is 2,3 or 4.