CN2186436Y - Balance transformer with triphase change to two-phase - Google Patents

Balance transformer with triphase change to two-phase Download PDF

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CN2186436Y
CN2186436Y CN 94226449 CN94226449U CN2186436Y CN 2186436 Y CN2186436 Y CN 2186436Y CN 94226449 CN94226449 CN 94226449 CN 94226449 U CN94226449 U CN 94226449U CN 2186436 Y CN2186436 Y CN 2186436Y
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phase
transformer
phase side
winding
mutually
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周有庆
张秀芝
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Hunan University
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Hunan University
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Abstract

The utility model relates to a three-two phase balance transformer composed of three phase side windings 1, 2 and 3, a first and second secondary windings 4 and 5 of a two phase side phase post A, a first and second secondary windings 6 and 7 of a phase post C, as well as a secondary winding 8 of a phase post B winded on a three-post iron core with uniform cross section, wherein, the first secondary windings 4 and 6 are connected in series to form a two phase side phase a; the secondary windings 7, 5 and 8 are connected in series or connected into a triangle to form a two phase side phase b. The transformer are mainly served as a traction power supply transformer in electric railway, or a two-three phase transformer, or a regional power supply transformer, etc. with various power supply modes, high power quality of power supply, low manufacturing cost, little additional loss and high utilization rate of iron core.

Description

Balance transformer with triphase change to two-phase
The utility model relates to a kind of power transformer, particularly a kind of three-phase electrical power system with symmetry be transformed to voltage each other 90 ° of electrical degrees two-phase or carry out the three-phase to two phase balance transformer of inverse transformation.
At present both at home and abroad electrified railway traction power supply system adopts quarter-phase system usually, the uplink that joins, the downlink that joins.Owing to adopt common Y/ △ type power transformer power supply, with producing very big negative-sequence current, bring very big influence to three-phase electrical power system, therefore many national electric railways have adopted the balancing transformer power supply.The wherein external balancing transformer of producing has Scott (scott) type, Li Bolunke (Le Blanc) type and Wood bridge (Wood-dbrige) type, and China produces balanced impedance matching transformer.The characteristics of balancing transformer are that low-pressure side two phase voltages are 90 ° of electrical degrees, and when the two-phase load current equated, the high-pressure side three-phase current is balance both, again symmetry; When the two-phase load current did not wait, the high-pressure side three-phase current is balance still, but asymmetric, but its symmetry is better than Y/ △ power transformer greatly.Scott balancing transformer high-pressure side neutral point can not ground connection, and the high pressure winding will raise cost by all insulation (line voltage) design; Because the transformer high and low pressure side does not have the triangle loop, therefore all contain third-harmonic component in magnetic flux, induced potential and the electric current, may cause transformer core and shell local pyrexia, influence the waveform of voltage, bring interference for communication along the line, in addition, the winding complicated layout, inconvenience is provided with the tap pressure regulation, and utilance unshakable in one's determination is not high yet; Its both available BT supply power mode, also available AT supply power mode adopts in the more abundant Japan of power system capacity, South Korea and American-European a few countries at present, and China Zhengzhou to Wuchang electric railway also is to adopt the Scott balancing transformer.Li Bolunke balancing transformer high-pressure side is a delta connection, has eliminated the influence of triple-frequency harmonics, but because triangle loop three-phase current is uneven system, therefore all there is bigger circulation in any ruuning situation, has increased supplementary load loss; In addition, the high-pressure side does not have neutral ground, and the high pressure winding must increase cost by all insulation design, adopts in China Taiwan Province and a few countries at present.Wood bridge balancing transformer high-pressure side neutral point is ground connection directly, and the high pressure winding can have the triangle loop in low-pressure side by graded insulation (phase voltage) design, but the low pressure winding has the contact of electricity mutually, the two-phase lead-out wire does not have common point, can only be used for the AT supply power mode, adopts in Japan at present.The balanced impedance matching transformer that China produces, the high-pressure side neutral point is ground connection directly, and low-pressure side has the triangle loop, quarter-phase circuit has common point can connect rail, but low pressure two phase windings have the contact of electricity, B phase winding complexity, the impedance matching difficulty can only be used for direct-furnish and BT supply power mode.
Above-mentioned defective at the prior art existence, the purpose of this utility model, be that traction power supply for electric railway provides a kind of any supply power mode and three-phase to two phase balance transformer that can improve the power supply quality of power supply in existing three kinds of supply power modes that uses, make its low cost of manufacture simultaneously, supplementary load loss are little, utilance height unshakable in one's determination.
Solution of the present utility model is as follows.It still has the three-phase side winding 1,2,3 that umber of turn is respectively WA, WB, WC, transformer core adopts uiform section three pillar type iron core, and its feature part is, the two-phase side has A that umber of turn is respectively Wa1 and Wa2 post first auxiliary winding 4 and A post second auxiliary winding 5 mutually mutually, the C that umber of turn is respectively Wc1 and Wc2 is post first auxiliary winding 6 and C post second auxiliary winding 7 mutually mutually, and umber of turn is the B phase post auxiliary winding 8 of Wb; Winding 1,4,5 is on a side column of uiform section three pillar type iron core, and winding 3,6,7 symmetries are wound on another side column of uiform section three pillar type iron core, and winding 2,8 is wound on the intermediolateral column of uiform section three pillar type iron core; Winding 4 be in series with 6 and a that constitutes two-phase side winding mutually, winding 7,5,8 is connected successively or end to endly is linked to be triangle and constitutes the b phase of two-phase side winding.
The utility model with said structure, its winding are arranged with line and are directly selected principle and impedance computation method all identical with general power transformer.Its A, B, C three-phase electromagnetic capacity equate each self-balancing of number of ampere turns.If be designed to the relative two-phase side of three-phase side is the high pressure winding, then winding 1,2,3 is arranged in outermost layer, winding 4 and 5 is arranged in A post innermost layer and intermediate layer mutually, winding 6 and 7 is arranged in C post innermost layer and intermediate layer mutually, and winding 8 can be divided into two windings and be arranged in B phase post innermost layer and intermediate layer; Is the low pressure winding as if being designed to three-phase side with respect to the two-phase side, then the winding reversing of position of each phase post outermost layer and innermost layer.Each winding is by economic current density and moving, thermally-stabilised requirement selection wire footpath, the equivalent impedance of each winding calculates by general many windings transformer impedance computational methods, in the time of should guaranteeing the mutual short circuit of four exits of two-phase side, the three-phase shortcircuit impedance of seeing into from three-phase side equates.
On the winding 5,7 of the utility model two-phase side b phase and their tie point, can draw three symmetrical institute's electricity consumption power supplys, but also access area supply transformer, also can be by three-phase filtered electrical power factor compensation capacitance perhaps.
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 adopts the elementary diagram of the present utility model that is connected in series mutually for three-phase side adopts Y-connection two-phase side b;
Fig. 2 adopts the elementary diagram of the present utility model that is connected in series mutually for three-phase side adopts triangle to connect two-phase side b;
The elementary diagram of the present utility model that Fig. 3 adopts Y-connection two-phase side b to adopt triangle to connect mutually for three-phase side;
Fig. 4 connects the elementary diagram of the present utility model that two-phase side b adopts triangle to connect mutually for three-phase side adopts triangle.
Referring to Fig. 1, the selection principle of each umber of turn of transformer of this mode of connection is: WA:Wa1=Wc:Wc1=K1, WA:Wa2=Wc:Wc2=
Figure 942264495_IMG5
K1, WB:Wb=
Figure 942264495_IMG2
K1, K1 is the three-phase side phase voltage that provides of known conditions and the two-phase side a ratio of phase voltage mutually in the formula.Its mode of connection has guaranteed A=j
Figure 942264495_IMG8
B.With transformer two-phase side electric current B=Ib is a reference vector,
Figure 942264495_IMG10
The positive direction of a is leading
Figure 942264495_IMG11
B90 ° of electrical degree, then transformer three-phase side and two-phase side current matrix equation are:
Following formula meets the current matrix equation basic principle of three-phase to two phase balance transformer, when 1a=1b, A,
Figure 942264495_IMG14
B,
Figure 942264495_IMG15
CBoth balance was symmetrical again; During 1a ≠ 1b, keep balance.
Referring to Fig. 2, the selection principle of each umber of turn of transformer of this mode of connection is: WA:Wa1=Wc:Wc1=K2, WA:Wa2=Wc:Wc2=
Figure 942264495_IMG5
K2, WB:Wb=
Figure 942264495_IMG2
K2, K in the formula 2The three-phase side line voltage that provides for known conditions and two-phase side a be the ratio of phase voltage mutually.Its mode of connection has also guaranteed
Figure 942264495_IMG17
A=j B.If two-phase side load character is identical, then
Figure 942264495_IMG19
A is leading
Figure 942264495_IMG20
B90 ° of electrical degree, with B is a reference vector, phase current in the three-phase side triangle
Figure 942264495_IMG22
AB,
Figure 942264495_IMG23
BC,
Figure 942264495_IMG24
CAWith
Figure 942264495_IMG25
A,
Figure 942264495_IMG26
The current matrix equation of b is:
Following formula meets the current matrix equation basic principle of three-phase to two phase balance transformer, when 1a=1b,
Figure 942264495_IMG28
AB,
Figure 942264495_IMG29
BC,
Figure 942264495_IMG30
CABe symmetrical balance system; During 1a ≠ 1b,
Figure 942264495_IMG31
AB, BC, CABe equilibrium system, acyclic miscarriage is given birth in the triangle loop.
The three-phase side line current
Figure 942264495_IMG34
A,
Figure 942264495_IMG35
B,
Figure 942264495_IMG36
CWith
Figure 942264495_IMG37
A, The current matrix equation of b is:
Figure 942264495_IMG39
Following formula also meets the basic principle of balancing transformer current matrix equation.
Referring to Fig. 3, the selection principle of each umber of turn of transformer of this mode of connection is: WA:Wa1=Wc:Wc1=K1, WA:Wa2=WB:Wb=Wc:Wc2=
Figure 942264495_IMG4
K1, K1 is the three-phase side phase voltage that provides of known conditions and the two-phase side a ratio of phase voltage mutually in the formula.Its mode of connection has guaranteed a=
Figure 942264495_IMG43
B.With transformer two-phase side electric current
Figure 942264495_IMG44
B=1b is a reference vector,
Figure 942264495_IMG45
The positive direction of a is leading
Figure 942264495_IMG46
B90 ° of electrical degree, then transformer three-phase side and two-phase side current matrix equation are:
Following formula meets the basic principle of balancing transformer current matrix equation.
Referring to Fig. 4, the selection principle of each umber of turn of transformer of this mode of connection is: WA:Wa1=Wc:Wc1=K2, WA:Wa2=WB:Wb=Wc:Wc2=
Figure 942264495_IMG4
K2, K2 is the three-phase side line voltage that provides of known conditions and the two-phase side a ratio of phase voltage mutually in the formula.Its mode of connection has guaranteed
Figure 942264495_IMG49
=
Figure 942264495_IMG50
With transformer two-phase side electric current B=1b is a reference vector,
Figure 942264495_IMG52
The positive direction of a is leading
Figure 942264495_IMG53
B90 ° of electrical degree, then the current matrix equation of phase current is in the transformer three-phase side triangle:
Figure 942264495_IMG54
Three-phase side line current matrix equation is:
Figure 942264495_IMG55
More than two formulas all meet the basic principle of balancing transformer current matrix equation.
From Fig. 1 to Fig. 4 as can be seen, on the winding 5,7 of the utility model two-phase side b phase and their tie point, can draw the three phase mains end, be used to connect house transformer, but also access area supply transformer also can connect perhaps power factor compensation capacitance of three-phase filtered electrical.
The utility model is mainly used in electric railway and makees the traction power supply transformer, perhaps carries out the replacing of two phase transformation three-phases and does used change or regional power supply transformer, also can be used for the factory or the mine user of two single-phase loads.Be characterized in that two-phase side a phase and b phase winding are simple, independent mutually, there is not the contact of electricity, be used for direct-furnish or BT supply power mode, there is common point can connect rail; The utility model also can be used for the AT supply power mode.Transformer high-voltage side three phase windings have star connection, and neutral point is ground connection directly, and winding insulation can design by phase voltage, has reduced cost; The three-phase high-voltage winding has delta connection, and three-phase current is an equilibrium system in triangle, and the no circulation of normal operation can suppress the triple-frequency harmonics in magnetic flux and the electromotive force again, has improved the power supply quality of power supply, has prevented transformer case local overheating and supplementary load loss again.In addition, the two-phase side also has the three phase mains exit, and having overcome Scott balancing transformer high-pressure side had not both had neutral ground, did not have the triangle loop again, and the shortcoming that utilance unshakable in one's determination is not high, its combination property are better than domestic and international all kinds of three-phase to two phase balance transformer at present.

Claims (5)

1, a kind of three-phase to two phase balance transformer has umber of turn and is respectively W A, W B, W CThree-phase side winding (1), (2), (3), transformer core adopts uiform section three pillar type iron core, it is characterized in that, the two-phase side has A that umber of turn is respectively Wa1 and Wa2 post first auxiliary winding (4) and A post second auxiliary winding (5) mutually mutually, the C that umber of turn is respectively Wc1 and Wc2 is post first auxiliary winding (6) and C post second auxiliary winding (7) mutually mutually, and umber of turn is the B phase post auxiliary winding (8) of Wb; Winding (1), (4), (5) are on a side column of uiform section three pillar type iron core, and winding (3), (6), (7) symmetry are wound on another side column of uiform section three pillar type iron core, and winding (2), (8) are wound on the intermediolateral column of uiform section three pillar type iron core; Winding (4) be in series with (6) and a that constitutes two-phase side winding mutually, connect successively or end to endly are linked to be triangle and constitute the b phase of two-phase side winding in winding (7), (5), (8).
2, transformer as claimed in claim 1 is characterized in that, three-phase side adopts Y-connection and two-phase side b adopts mutually and is connected in series, and each umber of turn selection principle is: WA:Wa1=Wc:Wc1=K1, WA:Wa2=Wc:Wc2=
Figure 942264495_IMG5
K 1, WB:Wb=
Figure 942264495_IMG3
, K1 is the three-phase side phase voltage that provides of known conditions and the two-phase side a ratio of phase voltage mutually in the formula.
3, transformer as claimed in claim 1 is characterized in that, three-phase side adopts triangle to connect and two-phase side b adopts mutually and is connected in series, and each umber of turn selection principle is: WA:Wa1=Wc:Wc1=K2, WA:Wa2=Wc:Wc2=
Figure 942264495_IMG5
K2, WB:Wb=
Figure 942264495_IMG2
K2, K2 is the three-phase side line voltage that provides of known conditions and the two-phase side a ratio of phase voltage mutually in the formula.
4, transformer as claimed in claim 1 is characterized in that, three-phase side adopts Y-connection and two-phase side b adopts triangle to connect mutually, and each umber of turn selection principle is: WA:Wa1=Wc:Wc1=K1, WA:Wa2=WB:Wb=Wc:Wc2=
Figure 942264495_IMG4
K1, K1 is the three-phase side line voltage that provides of known conditions and the two-phase side a ratio of phase voltage mutually in the formula.
5, transformer as claimed in claim 1 is characterized in that, three-phase side adopts triangle to connect and two-phase side b adopts triangle to connect mutually, and each umber of turn selection principle is: WA:Wa1=Wc:Wc1=K2, WA:Wa2=WB:Wb=Wc:Wc2=
Figure 942264495_IMG4
K2, K2 is the three-phase side line voltage that provides of known conditions and the two-phase side a ratio of phase voltage mutually in the formula.
CN 94226449 1994-03-25 1994-03-25 Balance transformer with triphase change to two-phase Expired - Fee Related CN2186436Y (en)

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CN 94226449 CN2186436Y (en) 1994-03-25 1994-03-25 Balance transformer with triphase change to two-phase

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Application Number Priority Date Filing Date Title
CN 94226449 CN2186436Y (en) 1994-03-25 1994-03-25 Balance transformer with triphase change to two-phase

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CN2186436Y true CN2186436Y (en) 1994-12-28

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105609276A (en) * 2016-02-26 2016-05-25 中国人民解放军海军工程大学 Marine three-phase-into-two-phase balancing transformer
CN113852070A (en) * 2021-09-09 2021-12-28 中铁二院工程集团有限责任公司 Traction and electric power hybrid power supply system for alternating current electrified rail transit engineering

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105609276A (en) * 2016-02-26 2016-05-25 中国人民解放军海军工程大学 Marine three-phase-into-two-phase balancing transformer
CN113852070A (en) * 2021-09-09 2021-12-28 中铁二院工程集团有限责任公司 Traction and electric power hybrid power supply system for alternating current electrified rail transit engineering
CN113852070B (en) * 2021-09-09 2023-09-22 中铁二院工程集团有限责任公司 Traction and power hybrid power supply system for alternating current electric rail transit engineering

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