CN1249554A - Four-phase AC transmission system - Google Patents
Four-phase AC transmission system Download PDFInfo
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- CN1249554A CN1249554A CN 98112653 CN98112653A CN1249554A CN 1249554 A CN1249554 A CN 1249554A CN 98112653 CN98112653 CN 98112653 CN 98112653 A CN98112653 A CN 98112653A CN 1249554 A CN1249554 A CN 1249554A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 42
- 239000004020 conductor Substances 0.000 claims description 11
- 230000009466 transformation Effects 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims 1
- 230000017105 transposition Effects 0.000 description 12
- 238000000844 transformation Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 241000282326 Felis catus Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
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Abstract
A four-phase AC transmission system is composed of three phase-to-four phase step-up transformer, four-phase transmission lines arranged by regular quadrangle in space, and four phase-to-three phase step-down transformer, all of which are serially connected. It is mainly used for high-voltage and high-capacity electric transmission with the advantages of high transmission power density, less occupied ground area, simplified tower and low cost.
Description
The present invention relates to a kind of AC transmission system, adopt four phase transmission line transmission of electric energy of symmetry.
At present, AC transmission system adopts three-phase system usually both at home and abroad.Because generator and motor in the electric power system all adopt three-phase system, three-phase power transformer manufactures and designs simple and convenient, and the three-phase system transmission of electricity has become traditional power transmission mode.But in three phase line, voltage between phase and phase is the voltage between the phase and ground
Doubly, air insulation between the three-phase conducting wire is had relatively high expectations, make the spacing broad that three-phase conducting wire is arranged, the shared land area in waste stringing corridor, it is bigger to take up an area of reimbursement for expenses.Because three-phase conducting wire can not be suspended on the both sides of single-column shaft tower symmetrically, make that the shaft tower design is complicated, and waste shaft tower steel.
Abroad, the research of 6 phases, 9 phases, 12 phases, 24 equal heterogeneous transmission systems was carried out for two more than ten years.Heterogeneous transmission of electricity is a kind of important method that improves transmission power density.The phase number average of existing heterogeneous transmission system is 3 integral multiple, realize three-phase and heterogeneous between the power transformer of conversion easily manufactured.But, for fear of the transposition of heterogeneous transmission line complexity, each phase conductor must be arranged in regular polygon, this makes 6 suspensions that reach above heterogeneous lead mutually difficulty more, and tower structure is complicated more, and the circuit cost rises; Along with the increase of the circuit number of phases, the fault composite type of heterogeneous transmission line increases sharply, and this makes the design of faults analysis calculating, relaying protection and adjusts has increased difficulty; Breaker structure more complicated in the heterogeneous transmission system, alternate overvoltage multiple is higher.Because above-mentioned shortcoming, six reach above heterogeneous power transmission mode is not mutually applied.
At the above-mentioned defective that prior art exists, purpose of the present invention is that a kind of high voltage, jumbo four phase transmission systems of mainly being applicable to are provided.Make transmission capacity increase, tower structure is simplified, and saves the floor space in stringing corridor, reduces the cost of investment of convey unit capacity.
Solution of the present invention is as follows.Its feature part is to have three phase transformations, four phase step-up transformers 1, four phase conductors, 2,3,4,5, the four phase transformation triphase step-down transformers 6 of transmission line.Between the four mutually electric phasors of transmission system, 90 ° of electrical degrees of mutual deviation on electric are four phase phasors of one group of symmetry.
The system of the present invention of tool said structure, three phase transformations, four phase step-up transformers and four phase transformation triphase step-down transformers are novel electric power transformers of a kind of symmetry transformation, the patent of will dividing an application.Four phase circuit symmetries are suspended on the both sides of single-column shaft tower.The parameter meter method of circuit, the sectional area selection principle of lead, tower structure and insulator design, identical with general transmission line.
Four phase transmission lines are accomplished four phase parameter balances by reasonably arranging and transposition.
Below in conjunction with drawings and Examples the present invention is further specified.
Fig. 1 is the principle of compositionality figure of system of the present invention.
Fig. 2 is four phase conductor a of the present invention, b, c, d square Pareto diagram.
Fig. 3 is four phase conductor a of the present invention, b, c, d is horizontal and finish an integer circulation transposition figure.
Fig. 4 is four phase conductor a of the present invention, b, c, d is horizontal and finish an integer circulation transposition figure.
Fig. 5 is four phase conductor a, b, c, the arrangement of d isosceles trapezoid and finishes an integer circulation transposition figure.
Referring to Fig. 1.The three-phase side of three phase transformations, four phase step-up transformer T1 is connected with three-phase electrical power system S1, and four phase sides are connected with four transmission line a, b, c, d head end by four phase circuit breakers.The four phase sides of four phase transformation three-phase step-down transformation T2 are by four phase circuit breakers and four transmission line a, b, the terminal connections of c, d mutually, and three-phase side is connected with three-phase electrical power system S2.T1, a, b, c, d, T2 constitute four phase transmission systems.Four mutually electric phasors of transmission system are four phase phasors of one group of symmetry, by four phase transmission systems mutual electric energy transmitting between the three-phase electrical power system of both sides.
Referring to Fig. 2.Four phase circuit a, b, c, d square are arranged, and not replacing to guarantee four phase parameter balances.If the length of side of square is m, the alternate geometric mean distance that then calculates every phase parameter employing is
, its parameter calculation formula is identical with the triphase parameter computing formula.
Referring to Fig. 3.Four phase circuit a, b, c, d are horizontal, replace equidistantly between in the line and finish an integer circulation transposition for three times, can guarantee four phase parameter balances.If the distance between the two adjacent phase line roads is m, then alternate geometric mean distance is D
Eq=2m.
Referring to Fig. 4.Four phase circuit a, b, c, d are horizontal, replace equidistantly between in the line and finish an integer circulation transposition for three times, can guarantee four phase parameter balances.If the distance between the two adjacent phase line roads is m, then alternate geometric mean distance is D
Eq=2m.Hand over Fig. 3 scheme ratio, the transposition of this programme is comparatively simple.
Referring to Fig. 5.Four phase circuit a, b, c, d isosceles trapezoid arrange, in the line between equidistant, equidirectional rolling transposition finish an integer circulation transposition for three times, can guarantee four phase parameter balances.If the last bottom width of isosceles trapezoid is m
1, following bottom width is m
2, height is h, then alternate geometric mean distance is
This programme and Fig. 2 scheme relatively can be eliminated the influence to following two-phase circuit of the icing of top two-phase circuit and fault.In addition, in this programme, if being rectangles, arrange in four phase circuits, i.e. m
1=m
2, then as long as once just finish an integer circulation transposition at the mid point rolling transposition of circuit, alternate geometric mean distance is
System of the present invention mainly is applicable to high voltage, jumbo power delivery.The four phase transmission systems that each phase circuit square is arranged and each three-phase power transmission systematic comparison of circuit equilateral triangle arrangement mutually: external electromagnetic field distributes more even, can compress the stringing width of corridor, increases by a phase circuit simultaneously, increases transmission line capability; If keep the two alternate geometric mean distance D of four phase transmission lines and three phase line
EqConstant, then the two every phase line parameter circuit value and corona critical voltage are constant, and the transmission capacity of four phase circuits is increased at three-phase
Doubly, the space radius that the stringing corridor of four phase circuits occupies reduces to three-phase on the contrary
Doubly, the floor space of four phase transmission system convey unit capacity is a three-phase
Doubly, promptly saved 35% occupation of land compensation investment.
Four phase circuits of the present invention are even number phases, and symmetry is good, four phase circuits can the symmetry the both sides that are suspended on the single-column shaft tower, tower structure is simple.And three-phase line need adopt asymmetric single-column shaft tower, perhaps adopts the cat head formula shaft tower of symmetry, the tower structure complexity.
Claims (3)
1. four-phase AC transmission system is characterized in that:
Transmission system has four phase uiform section lead a (2), b (3), c (4), d (5), the four phase transformation three-phase power transformation T2 (6) of power transformer changing triphase into four-phase T1 (1), four phase overhead transmission lines, four phase conductors (2), (3), (4), (5) 90 ° of electrical degrees of mutual deviation successively on electric.
2. transmission system according to claim 1 is characterized in that: solid conductor is all adopted in four phase conductors (2), (3), (4), (5).
3. transmission system according to claim 1 is characterized in that: bundle conductor is all adopted in four phase conductors (2), (3), (4), (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98112653 CN1249554A (en) | 1998-09-29 | 1998-09-29 | Four-phase AC transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98112653 CN1249554A (en) | 1998-09-29 | 1998-09-29 | Four-phase AC transmission system |
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| Publication Number | Publication Date |
|---|---|
| CN1249554A true CN1249554A (en) | 2000-04-05 |
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ID=5222481
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98112653 Pending CN1249554A (en) | 1998-09-29 | 1998-09-29 | Four-phase AC transmission system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105448502A (en) * | 2015-12-25 | 2016-03-30 | 华中科技大学 | Insulation ferrite core transformer type high voltage power supply |
| CN114696629A (en) * | 2022-04-20 | 2022-07-01 | 东北电力大学 | Subsea power distribution system based on low-frequency four-phase AC transmission |
| CN114696326A (en) * | 2022-04-20 | 2022-07-01 | 东北电力大学 | Multi-terminal interconnection low-frequency four-phase transmission system of urban power grid |
| CN114744611A (en) * | 2022-03-22 | 2022-07-12 | 东北电力大学 | Deep open sea wind power low-frequency four-phase alternating current power transmission and distribution system |
| CN114844092A (en) * | 2022-03-22 | 2022-08-02 | 东北电力大学 | Back-to-back offshore island grid interconnection low-frequency four-phase transmission system |
-
1998
- 1998-09-29 CN CN 98112653 patent/CN1249554A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105448502A (en) * | 2015-12-25 | 2016-03-30 | 华中科技大学 | Insulation ferrite core transformer type high voltage power supply |
| CN114744611A (en) * | 2022-03-22 | 2022-07-12 | 东北电力大学 | Deep open sea wind power low-frequency four-phase alternating current power transmission and distribution system |
| CN114844092A (en) * | 2022-03-22 | 2022-08-02 | 东北电力大学 | Back-to-back offshore island grid interconnection low-frequency four-phase transmission system |
| CN114696629A (en) * | 2022-04-20 | 2022-07-01 | 东北电力大学 | Subsea power distribution system based on low-frequency four-phase AC transmission |
| CN114696326A (en) * | 2022-04-20 | 2022-07-01 | 东北电力大学 | Multi-terminal interconnection low-frequency four-phase transmission system of urban power grid |
| CN114696629B (en) * | 2022-04-20 | 2024-10-22 | 东北电力大学 | Submarine power distribution system based on low-frequency four-phase AC transmission |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
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