CN101958187A - All-insulated on-load voltage-regulating transformer angularly connected on 220-kilovolt high voltage side - Google Patents
All-insulated on-load voltage-regulating transformer angularly connected on 220-kilovolt high voltage side Download PDFInfo
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- CN101958187A CN101958187A CN 201010269162 CN201010269162A CN101958187A CN 101958187 A CN101958187 A CN 101958187A CN 201010269162 CN201010269162 CN 201010269162 CN 201010269162 A CN201010269162 A CN 201010269162A CN 101958187 A CN101958187 A CN 101958187A
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Abstract
The invention discloses an all-insulated on-load voltage-regulating transformer angularly connected on 220-kilovolt high-voltage side. The main body comprises a high-voltage coil, voltage-regulating coils, a low-voltage coil and the like, the voltage-regulating coils in related two phases connected end to end are connected through contacts of a tap selector of an on-load voltage-regulating switch, so that the on-load voltage-regulating switch realizes the voltage-regulating function by using a two-phase switch and a single-phase switch, and the conventional structure with three single-phase switches is replaced. Meanwhile, a right amount of lightning arrester elements are connected between the head end and the tail end of each phase of the voltage-regulating coil so as to limit the potential oscillation of the voltage-regulating coil under the impact of a thunder, the insulation level of the tap selector of the on-load voltage-regulating switch is obviously reduced, and the switch is protected reliably. The invention realizes the purposes of obviously reducing the cost of the on-load voltage-regulating switch with low cost and reliably protecting the on-load voltage-regulating switch at a low cost.
Description
Technical field
The invention belongs to field transformer, relate to a kind of all insulation transformer, specifically a kind of all insulation on-load tap-changing transformer that 22 ten thousand volts high-pressure side corner connections of built-in lightning arrester are set.
Background technology
In the electric power system at home, the on high-tension side connection of 22 ten thousand volts is star connection, and this is most economical for the high pressure winding; Both can there be neutral point to utilize, allow direct ground connection or pass through impedance earth, the insulation level that can reduce neutral point again (is a graded insulation, it is the insulation level that the insulation level of the winding line end of star connection is higher than neutral point, with 22 ten thousand volts is example, the insulation level of line end is LI950AC395, and the insulation level of neutral point is LI400AC200); Can establish tap at every phase neutral point place, on-load voltage regulating switch can adopt the neutral point pressure regulation; Therefore, in the standard GB/T6451 of oil-immersed power transformer performance parameter, stipulate, 22 ten thousand volts power transformers of which kind of pattern no matter, star connection all need be adopted in its high-pressure side, to guarantee the reasonability of transformer type selecting.For two circles of 22 ten thousand volts of non-self coupling or three circle on-load tap-changing transformers, owing to adopt the neutral point voltage regulating mode, voltage difference between each phase tap is very little, on-load voltage regulating switch can be selected three-phase integrated structure for use, its insulation against ground level is according to the insulation level of high-pressure side neutral point, because of it is the graded insulation system, so the highest common insulation level that only is equivalent to 11 ten thousand volts.
But in the electric power system abroad, especially in some country of Middle East, for historical reasons and actual requirement of engineering, the on high-tension side connection of 22 ten thousand volts is set to delta connection sometimes, promptly the end of a phase connects the head end of another phase, and this makes transformer become the identical all insulation transformer of first and last end insulation level inevitably; If on-load tap-changing transformer, then the insulation level of on-load voltage regulating switch also improves thereupon, and manufacturing cost sharply rises.
Under conventional connection principle, test voltage difference between the tap of out-phase is equivalent to 22 complete ten thousand volts insulation test voltages at least, if consider the shock oscillation voltage under the lightning impulse voltage effect, even will be greater than 22 ten thousand volts head ends insulation test voltage over the ground, the very little situation of voltage difference under neutral point voltage regulating mode when this is different from star connection fully between each phase tap, make the switch that adopts three-phase integrated type no longer may, and must use three single-phase loaded switchs, only the on-load voltage regulating switch cost just will increase to when three-phase integrated about 2.4 times (the three-phase integrated composite type on-load voltage regulating switch price general chargeds of the German import of the mainstream configuration of domestic 220,000 grades of transformers all in RMB more than 500,000 yuan).If considering needs the fuel tank volume of therefore expansion and the consumption of transformer oil, it is more then to increase cost.
In addition, the insulation level parameter of on-load voltage regulating switch is except switch insulation level over the ground, the parameter of another no less important is the insulation level of tap selector, it depends on that voltage regulation coil surge voltage whole and each tap inter-stage is poor, if voltage regulation coil oscillating voltage under the lightning impulse effect is very big, then must the sufficiently high tap selector of the configuration class of insulation.Especially require will be listed in special specification when too high when the insulation level of tap selector, price is very expensive.
But in the on-load tap-changing transformer of this high-pressure side corner connection, overvoltage problem under the lightning impulse is quite serious, because the end of a phase is promptly connecting the head end of another phase, no matter which phase head end carries out lightning impulse test, all be equivalent to the voltage regulation coil and the tap changer of another phase are directly applied surge voltage, especially be in specified tap position when the on-load voltage regulation switch---just go into wave point and under the whole vacant state of voltage regulation coil at the tap of voltage regulation coil first and last end, voltage regulation coil is in free-running operation fully, promptly be equivalent to the surge voltage of a 950kV is applied directly to an end of voltage regulation coil, and other each tap is all unsettled when letting alone free oscillation, the impact potential difference that integral oscillation between the first and last end of voltage regulation coil impacts potential difference and shunting tap inter-stage will reach sizable numerical value, according to carry out the result that wave process calculates and the semi-finished product distribution potential is measured at different loop construction types, integral oscillation impacts current potential peak value maximum can reach more than 60% of crest value, promptly may be greater than 950 * 60%=570kV, and maximum in the world on-load tap-changer of transformer manufacturer---German MR company combined on-load voltage regulating switch provided the specification of the tap selector of high insulation level be " DE " type, it is 550kV that integral oscillation between the first and last end of corresponding voltage regulation coil impacts the current potential higher limit, as seen, needed special loaded switch this moment.But select the loaded switch of the tap selector that disposes sufficiently high insulation level simply for use or order special switch, it is not the basic road of dealing with problems, improve reliability, because in case the shock oscillation outside the estimate analysis takes place and has surpassed the voltage endurance capability of switch itself, on-load voltage regulating switch will wreck, and reprocess or replacement cost can not be ignored.
For the on-load voltage regulating switch in the EHV transformer, under the prerequisite that electric current and pressure regulation progression are determined, the insulation level of the number of phases of switch, insulation against ground level and tap selector has determined the switch price.Therefore, when the various superhigh pressure on-load voltage regulating switch transformer of design, in order to reduce cost and to improve reliability, one: should select two-phase one or three-phase integrated on-load voltage regulating switch for use as far as possible; Its two: should select the lower on-load voltage regulating switch of insulation level for use as far as possible; Its three: should avoid various superpotential impacts and cause damage by the improvement of the insulation technology protection switch of trying one's best.
22 ten thousand volts all insulation on-load tap-changing transformers at the corner connection of this high-pressure side, there is the people to propose tap is arranged on the method that Y-connected low-pressure side is carried out the neutral point pressure regulation before domestic, to avoid of the direct impact of high-pressure side lightning impulse voltage, so that optional with the very low switch of electric pressure to on-load voltage regulating switch; But this method can only rest in theory, because in practical engineering application, the rated capacity of this transformer is very big, can reach more than the 180MVA, in the Middle East even reach 300MVA, if be set to low voltage regulation, no doubt greatly reduce insulation level, but that its electrorheological gets is quite big, can reaches the 2000-3000 peace doubly even bigger, and 1200A is the upper current limit of three-phase integrated type switch usually, so must use three single-phase switchs.If consider structural shape feasibility and the manufacturability of tap lead and the leakage field effect that causes of the voltage regulation coil of so big electric current again, this method that tap is arranged on low-pressure side is worthless in high-power transformer.
Therefore, be necessary to study a kind of new structure of all insulation on-load tap-changing transformer of 22 ten thousand volts high-pressure side corner connections, can select for use heterogeneous one switch reducing the on-load voltage regulating switch cost, and can reduce the switch insulation level with the reliably protecting switch.
Summary of the invention
The object of the present invention is to provide and a kind ofly can select for use heterogeneous one switch reducing the on-load voltage regulating switch cost, and can reduce all insulation on-load tap-changing transformer of switch insulation level with 22 ten thousand volts high-pressure side corner connections of reliably protecting switch.
The present invention realizes that the technical scheme of foregoing invention purpose is: a kind of all insulation on-load tap-changing transformer of 22 ten thousand volts high-pressure side corner connections, has main body, main body comprises first high-tension coil, second high-tension coil, the 3rd high-tension coil, first voltage regulation coil, second voltage regulation coil, the 3rd voltage regulation coil and three low-voltage coils, described first high-tension coil links to each other with the first voltage regulation coil first and last, second high-tension coil links to each other with the second voltage regulation coil first and last, the 3rd high-tension coil links to each other with the 3rd voltage regulation coil first and last, described first voltage regulation coil is connected with single-phase on-load voltage regulating switch, its innovative point is: be connected with two-phase one on-load voltage regulating switch between described second voltage regulation coil and the 3rd voltage regulation coil, the end of the head end of described first high-tension coil and second high-tension coil joins end to end by lead-in wire; The head end of the head end of described second voltage regulation coil and the 3rd voltage regulation coil links to each other by the contact of the tap selector of two-phase one on-load voltage regulating switch; The end of the head end of described the 3rd voltage regulation coil and first voltage regulation coil joins end to end by the contact of the tap selector of single-phase on-load voltage regulating switch, and the first and last end of described first voltage regulation coil, second voltage regulation coil and the 3rd voltage regulation coil all is parallel with some pieces of unit of an arrester.
Described unit of an arrester is a 330V/mm high gradient resistor disc, and its diameter is about 64mm, thickness is about 22.5mm, and each resistor disc surge voltage protection level is 7.35kV.
The present invention change any one in mutually high-tension coil and the relative position of voltage regulation coil, make the voltage regulation coil in the end to end relevant two-phase continuous by the contact of the tap selector of on-load voltage regulating switch, the test voltage that has reduced greatly between this two-phase voltage regulation coil (being tap changer) is poor, make this two-phase be adopted the on-load voltage regulating switch of two-phase one, thereby the combination that whole transformer can adopt a two-phase one switch to add a single-phase switch realizes voltage regulation function, has replaced the structure that conventional needs use three single-phase switchs.Simultaneously; unit of an arrester in voltage regulation coil first and last end right quantity in parallel; can limit the electrical oscillation of voltage regulation coil under lightning impulse effectively, thereby reduce the insulation level of the tap selector of on-load voltage regulating switch, reach the purpose that reduces material cost and reliably protecting tap changer.
Description of drawings
Fig. 1 is an elementary diagram of the present invention.
Among Fig. 1 be with change B in mutually high-tension coil and the relative position of voltage regulation coil be example, do not limit certain phase during practical application, any one all can mutually.
Among Fig. 1, " A, B, C " is three-phase high-voltage side outlet terminal code name; " a, b, c, o " is three-phase low-pressure side and low pressure neutral point outlet terminal code name; " * " is end label symbol of the same name; " K " is on-load voltage regulating switch polarity selector contact code name; "+,-" be on-load voltage regulating switch polarity selector location designation; " X9, X8 ..., X1 ", " Y9, Y8 ..., Y1 ", " Z9, Z8 ..., Z1 " the voltage regulation coil tap that is followed successively by A, B, C three-phase lifts one's head code name.
Embodiment
Below in conjunction with accompanying drawing the present invention is made and to further describe.
A kind of all insulation on-load tap-changing transformer of 22 ten thousand volts high-pressure side corner connections, has main body, main body comprises first high-tension coil 1, second high-tension coil 1 ', the 3rd high-tension coil 1 "; first voltage regulation coil 2; second voltage regulation coil 2 '; the 3rd voltage regulation coil 2 " and three low-voltage coils 3, described first high-tension coil 1 links to each other with first voltage regulation coil, 2 first and last, second high-tension coil 1 ' links to each other with second voltage regulation coil, 2 ' first and last, the 3rd high-tension coil 1 " with the 3rd voltage regulation coil 2 " first and last links to each other, described first voltage regulation coil 2 is connected with single-phase on-load voltage regulating switch 4, described second voltage regulation coil 2 ' and the 3rd voltage regulation coil 2 " between be connected with two-phase one on-load voltage regulating switch 4 ', the end of the head end of described first high-tension coil 1 and second high-tension coil 1 ' joins end to end by lead-in wire; The head end of described second voltage regulation coil 2 ' and the 3rd voltage regulation coil 2 " the contact of head end by the tap selector of two-phase one on-load voltage regulating switch 4 ' link to each other; Described the 3rd voltage regulation coil 2 " head end and the end of first voltage regulation coil 2 contact by the tap selector of single-phase on-load voltage regulating switch 4 join end to end, so finish on high-tension side delta connection.
Described first voltage regulation coil 2, second voltage regulation coil 2 ' and the 3rd voltage regulation coil 2 " the first and last end all be parallel with some pieces of unit of an arrester 5.
Described unit of an arrester 5 is to choose the 330V/mm high gradient resistor disc that Japan makes, and its diameter is about 64mm, thickness is about 22.5mm, and every piece surge voltage protection level is 7.35kV.
As shown in Figure 1, change the second interior mutually high-tension coil 1 ' of B and the relative position of second voltage regulation coil 2 ', with B mutually second voltage regulation coil 2 ' place position near B phase outlet sleeve pipe, make end to end A, first voltage regulation coil 2 in the B two-phase links to each other with the moving contact of second voltage regulation coil 2 ' by the tap selector of two-phase one on-load voltage regulating switch 4 ', the test voltage that has reduced greatly between this two-phase voltage regulation coil (being tap changer) is poor, make this two-phase be adopted the on-load voltage regulating switch of two-phase one, remaining one still uses single-phase switch mutually, thereby the combination that whole transformer can adopt a two-phase one switch to add a single-phase switch realizes voltage regulation function, replace the structure that conventional needs use three single-phase switchs, obviously reduced on-load voltage regulating switch cost (can save about 30% usually).
Simultaneously, at first voltage regulation coil 2, second voltage regulation coil 2 ' and the 3rd voltage regulation coil 2 " unit of an arrester 5 of first and last end right quantity in parallel, can limit the electrical oscillation of voltage regulation coil under lightning impulse effectively.The nonlinear resistance plectane that this unit of an arrester 5 is a kind of porcelain systems, the conventional specification of monolithic is: diameter is about 64mm, thickness is about about 22.5mm, and every piece surge voltage protection level is about 7.35kV; The maximum voltage that suffers when maximum voltage that suffers when the maximum voltage that suffers when the maximum voltage that suffers when the conventional operation according to voltage regulation coil, partial discharge test, induced over voltage withstand test and short circuit is determined the quantity of zinc oxide arrester element, when transformer is subjected to lightning impulse, if the vibration potential of voltage regulation coil surpasses the maximum voltage that zinc oxide arrester element group can bear, nonlinear resistance has been dissolved the vibration overvoltage of voltage regulation coil with conducting.With tapping voltage is that the on-load tap-changing transformer of the high-pressure side corner connection of typical 220 ± 8 * 1.25%kV is an example, 21 pieces of the unit of an arrester of the conventional specification of need configuration, any two surge voltages between lifting one's head of voltage regulation coil will be limited in below the 154.35kV (=21 * 7.35) this moment, promptly reduce to do not install before the built-in lightning arrester below 1/3rd.As seen the shock oscillation of voltage regulation coil has been subjected to obvious suppression.
Adopt this impact to suppress after the structure; with the on-load voltage regulating switch that uses the tap selector have the very high class of insulation simply of routine (for all insulation on-load tap-changing transformer of 22 ten thousand volts high-pressure side corner connections; at least need select " DE " type tap selector of German MR company for use) compare with the way of strengthening coil master longitudinal insulation; the reliability of electric property improves greatly; can select on-load voltage regulating switch (need select " B " or " C " type tap selector for use for general according to the maximum voltage that the unit of an arrester group can bear simultaneously than low insulation grade tap selector; at least two specifications have been reduced); significantly reduced the on-load voltage regulating switch material cost, and the most direct and protected expensive switch effectively.In addition, because at first voltage regulation coil 2, second voltage regulation coil 2 ' and the 3rd voltage regulation coil 2 " the parallel connection of first and last end built-in lightning arrester 5; first voltage regulation coil 2, second voltage regulation coil 2 ' and the 3rd voltage regulation coil 2 " the impact electrical oscillation be limited in the small range, therefore, first voltage regulation coil 2, second voltage regulation coil 2 ' and the 3rd voltage regulation coil 2 " can adopt relative simple individual layer drum type brake or many helical windings structure; and oil duct can be selected littler size between its turn insulation thickness and cake, has saved material.
Claims (2)
1. all insulation on-load tap-changing transformer of a ten thousand volts high-pressure side corner connection, has main body, main body comprises first high-tension coil (1), second high-tension coil (1 '), the 3rd high-tension coil (1 "); first voltage regulation coil (2); second voltage regulation coil (2 '); the 3rd voltage regulation coil (2 ") and three low-voltage coils (3), described first high-tension coil (1) links to each other with first voltage regulation coil (2) first and last, second high-tension coil (1 ') links to each other with second voltage regulation coil (the 2 ') first and last, the 3rd high-tension coil (1 ") and the 3rd voltage regulation coil (2 ") first and last links to each other, described first voltage regulation coil (2) is connected with single-phase on-load voltage regulating switch (4), it is characterized in that: described second voltage regulation coil (2 ') and the 3rd voltage regulation coil are connected with two-phase one on-load voltage regulating switch (4 ') between (2 "), and the head end of described first high-tension coil (1) and the end of second high-tension coil (1 ') join end to end by lead-in wire; The head end of the head end of described second voltage regulation coil (2 ') and the 3rd voltage regulation coil (2 ") links to each other by the contact of the tap selector of two-phase one on-load voltage regulating switch (4 '); The head end of described the 3rd voltage regulation coil (2 ") and the end of first voltage regulation coil (2) join end to end by the contact of the tap selector of single-phase on-load voltage regulating switch (4), and the first and last end of described first voltage regulation coil (2), second voltage regulation coil (2 ') and the 3rd voltage regulation coil (2 ") all is parallel with some pieces of unit of an arrester (5).
2. all insulation on-load tap-changing transformer of 22 ten thousand volts high-pressure side corner connections according to claim 1; it is characterized in that: described unit of an arrester (5) is a 330V/mm high gradient resistor disc; its diameter is about 64mm, thickness is about 22.5mm, and the surge voltage protection level of each resistor disc is 7.35kV.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102691627A CN101958187B (en) | 2010-08-27 | 2010-08-27 | All-insulated on-load voltage-regulating transformer angularly connected on 220-kilovolt high voltage side |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102691627A CN101958187B (en) | 2010-08-27 | 2010-08-27 | All-insulated on-load voltage-regulating transformer angularly connected on 220-kilovolt high voltage side |
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| Publication Number | Publication Date |
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| CN101958187A true CN101958187A (en) | 2011-01-26 |
| CN101958187B CN101958187B (en) | 2011-12-28 |
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| CN2010102691627A Expired - Fee Related CN101958187B (en) | 2010-08-27 | 2010-08-27 | All-insulated on-load voltage-regulating transformer angularly connected on 220-kilovolt high voltage side |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103871721A (en) * | 2012-12-12 | 2014-06-18 | 国家电网公司 | On-load voltage regulating transformer allowing effective prevention of lightning impulses |
| CN116053013A (en) * | 2022-11-18 | 2023-05-02 | 上海交通大学 | General design method of large-scale transformer on-load tap-changer |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54162123A (en) * | 1978-06-14 | 1979-12-22 | Toshiba Corp | Tap changer in case of load |
| CN101354954A (en) * | 2008-05-28 | 2009-01-28 | 保定天威集团有限公司 | Load-ratio voltage transformer with angle-connecting high-voltage coil using reactance type on-load tap-changer |
-
2010
- 2010-08-27 CN CN2010102691627A patent/CN101958187B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54162123A (en) * | 1978-06-14 | 1979-12-22 | Toshiba Corp | Tap changer in case of load |
| CN101354954A (en) * | 2008-05-28 | 2009-01-28 | 保定天威集团有限公司 | Load-ratio voltage transformer with angle-connecting high-voltage coil using reactance type on-load tap-changer |
Non-Patent Citations (1)
| Title |
|---|
| 《高电压技术》 20041030 葛为民 220kV自耦有载调压变压器的波过程分析 , 第10期 2 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103871721A (en) * | 2012-12-12 | 2014-06-18 | 国家电网公司 | On-load voltage regulating transformer allowing effective prevention of lightning impulses |
| CN116053013A (en) * | 2022-11-18 | 2023-05-02 | 上海交通大学 | General design method of large-scale transformer on-load tap-changer |
| CN116053013B (en) * | 2022-11-18 | 2024-03-08 | 上海交通大学 | General design method of large-scale transformer on-load tap-changer |
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| CN101958187B (en) | 2011-12-28 |
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