CN103346514A - Method for determining minimum insulation distance among flexible busbars of 500kV transformer substation in high altitude region - Google Patents
Method for determining minimum insulation distance among flexible busbars of 500kV transformer substation in high altitude region Download PDFInfo
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- CN103346514A CN103346514A CN2013103029488A CN201310302948A CN103346514A CN 103346514 A CN103346514 A CN 103346514A CN 2013103029488 A CN2013103029488 A CN 2013103029488A CN 201310302948 A CN201310302948 A CN 201310302948A CN 103346514 A CN103346514 A CN 103346514A
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Abstract
The invention relates to a method for determining the minimum insulation distance among flexible busbars of a 500kV transformer substation in a high altitude region. The method comprises the steps of (1) calculating a correction factor m of an altitude correction factor, (2) obtaining an altitude correction factor Kam based on a switching impulse discharge correction formula, and (3) multiplying the altitude correction factor Kam by a required value of the interphase switching overvoltage of the flexible busbars of the 500kV transformer substation to obtain a switching discharge voltage U of the minimum insulation distance d needed among the flexible busbars of the 500kV transformer substation at high altitude when the altitude is 0m, then according to a discharge voltage curve of the air gaps of 0m altitude, and obtaining a gap d0 corresponding to the switching discharge voltage U when the altitude is 0m, namely, the d0 is the minimum insulation distance d needed among the flexible busbars of the 500kV transformer substation at the high altitude. A result obtained through the method for determining the minimum insulation distance among the flexible busbars of the 500kV transformer substation in the high altitude region is superior to a result obtained by an IEC60071 altitude correction method and a GB311.1 altitude correction method.
Description
Technical field
The present invention relates to the definite method of minimum insulation distance between the soft bus of a kind of high altitude localities 500kV transformer station, belong to power transformation engineering external insulation field.
Background technology
China's energy skewness weighing apparatus, abundant water, thermoelectricity resource concentrated in western high altitude localities, along with deepening continuously of national development of the West Regions, the transferring electricity from the west to the east demand is strong day by day, western high altitude localities must be passed through by ultra-high/extra-high voltage, long distance, jumbo transmission of electricity corridor and transformer station, and the high altitude localities rarefaction of air, the air insulation intensity in identical gap has reduction to some extent with the increase of height above sea level.
Transmission line and equipment are when normal running or failed operation, and system running state takes place to change suddenly, and the mutual conversion of system's electromagnetic energy causes concussion property transient process, causes very high switching overvoltage at some electric equipment or partial electric grid.Fast development along with electrical network, the raising of electric pressure, the amplitude of switching overvoltage also increases thereupon, and the external insulation of power transmission and transforming equipment is selected the switching overvoltage decisive role in the supergrid, it is one of principal element that determines the power transmission and transforming equipment insulation level, during the external insulation of power transmission and transforming equipment is selected how the insulation distance between the soft bus of choose reasonable transformer station be to build one of key issue that high altitude localities 500kV substation project faces, have great economy meaning and environmental benefit.
At present, the external insulation flash-over characteristic of high altitude localities electric equipment is carried out correlative study work both at home and abroad, many height above sea level and atmospheric correction method have been proposed, what have passes through the corresponding height above sea level of substitution or typical meteorological condition, can obtain the elevation correction factor, though it is simple and practical, relatively coarse.The on-site meteorological condition of substitution engineering that has, the method is relatively accurate, but meteorological data obtains to have corresponding difficulty.Height above sea level and atmospheric correction mainly contain the computational methods of standard recommendations such as GB311.1-1997, IEC60071-2:1996, GB/T16927.1-1997, DL/T620-1997 at present.GB/T16927.1-1997 does not distinguish the notable difference of the elevation correction index under the different voltages (switching impulse and lightning impulse), seems more coarse, is not suitable for doing the correction of alternate operation; DL/T620-1997 needs the real atmosphere condition of testing ground, simultaneously unified processing has been done on phase ground and alternate switching impulse, is not suitable for doing the correction of alternate operation.The bearing calibration of GB311.1-1997 is only considered height above sea level to the influence of dielectric strength, and with the dielectric strength of 1000m Altitude Regions as the starting point of proofreading and correct, then do not carry out elevation correction for 1000m and following area, show slightly coarse a little.The elevation correction method that IEC60071-2:1996 recommends is relevant with the test electrode type, mainly is suitable for below the height above sea level 2000m.
Summary of the invention
The objective of the invention is to overcome above-mentioned the deficiencies in the prior art and the definite method of minimum insulation distance between the soft bus of a kind of high altitude localities 500kV transformer station is provided, this method is transmitted to transformer station's soft bus switching overvoltage required value with the high altitude localities circuit and is adapted to height above sea level 0m, the relation curve of recycling height above sea level 0m required air gap, area and discharge voltage, determine the air gap distance between the soft bus of transformer station, be the soft bus of high altitude localities 500kV transformer station and move required minimum insulation distance.
Realize that the technical scheme that the object of the invention adopts is: the minimum insulation distance is determined method between the soft bus of a kind of high altitude localities 500kV transformer station, comprising:
(1) carry out linear fit according to the Different Altitude point 500kV transformer station alternate switching overvoltage value of soft bus, obtain the modifying factor m of elevation correction factor:
In the m=-0.0003U+1.2384 formula, U is switching overvoltage, unit: MV;
(2) adopt switching impulse discharge correction formula, obtain height above sea level correction factor K
Am:
(3) with described height above sea level correction factor K
AmMultiply by the alternate switching overvoltage required value of the soft bus of 500kV transformer station, obtain required minimum insulation between the soft bus of high height above sea level place 500kV transformer station apart from the switching overvoltage U of d when the height above sea level 0m, then according to height above sea level 0m air gap discharge voltage profile, the gap d of the switching overvoltage U correspondence when obtaining described height above sea level 0m
0, this gap d
0Be between the soft bus of high height above sea level place 500kV transformer station required minimum insulation apart from d.
In technique scheme, the alternate switching overvoltage required value of the soft bus of described 500kV transformer station is between 1.500MV～2.600MV.
The inventive method is by setting up the relation at high altitude localities and height above sea level 0m place, minimum insulation distance between the soft bus of required definite high altitude localities 500kV transformer station is converted to the operated discharge voltage at height above sea level 0m place, then according to height above sea level 0m air gap discharge voltage profile, obtain the gap d of the operated discharge voltage correspondence at height above sea level 0m place, this gap d is exactly minimum insulation distance between the soft bus of required definite Altitude Regions 500kV transformer station.
Description of drawings
Fig. 1 determines the flow chart of method for minimum insulation distance between the soft bus of high altitude localities 500kV transformer station of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with the drawings and specific embodiments.
The minimum insulation distance determines that method is by setting up Mathematical Modeling between the soft bus of high altitude localities 500kV transformer station of the present invention, mathematical model parameter is proposed, again according to demonstration test, the comparative analysis result of the test, determine the parameter in the Mathematical Modeling, and then propose the inventive method.The present invention is based on the external insulation electrical test of Different Altitude Regions, by to 500kV transformer station typical electrode---soft bus is in the result of the test of different tests point, comparative analysis difference, proposition is fit to the high height above sea level correction formula of the alternate operating impulse voltage of the soft bus of 500kV transformer station.As shown in Figure 1, the inventive method concrete steps are:
Step S100, obtain height above sea level correction factor K according to following formula (1)
Am:
In the formula, m is the modifying factor of height above sea level correction factor; H is height above sea level, 23m≤H≤3742m.
Step S200, by different altitude height testing site test, determine the value of the modifying factor m of following formula (1) intermediate altitude correction factor, specifically determine by following formula (2):
m=-0.0003U+1.2384 （2）
In the formula, U is switching overvoltage, unit: MV.
Step S300, with resulting height above sea level correction factor K
AmMultiply by the alternate switching overvoltage required value of the soft bus of 500kV transformer station, obtain required minimum insulation between the soft bus of high height above sea level place 500kV transformer station apart from the switching overvoltage U of d when the height above sea level 0m, then according to height above sea level 0m air gap discharge voltage profile, the gap d of the switching overvoltage U correspondence when obtaining described height above sea level 0m
0, this gap d
0Be between the soft bus of high height above sea level place 500kV transformer station required minimum insulation apart from d.
Wherein, the alternate switching overvoltage required value of the soft bus of 500kV transformer station is between 1.5MV～2.6MV.
Because the rising along with height above sea level, atmospheric density reduces gradually, the dielectric strength of the air in alternate gap can reduce to some extent, so the design specification of low altitude area can not directly simply be adopted in the air gap between the soft bus of high altitude localities transformer station, need suitably increase by the height above sea level correction.The inventive method has just provided the computing formula of the alternate switching impulse height above sea level of the soft bus of 500kV transformer station modifying factor.Illustrate below by specific embodiment.
Be example with the height above sea level 3000m area required minimal design gap d of 500kV transformer station's switching overvoltage, if alternate switching overvoltage required value is 2354kV, utilize formula (2) to revise, the modifying factor m=-0.0003U+1.2384 of height above sea level correction factor between 1.5MV～2.6MV time the according to the discharge voltage value, 2354kV is brought into the modifying factor m=0.629 that calculates the height above sea level correction factor in the following formula, with height above sea level 3000m substitution correction formula (1), obtain height above sea level correction factor K
Am=1.591, and then to draw the height above sea level 3000m area required minimal design gap d of 500kV transformer station's switching overvoltage operated discharge voltage U when height above sea level 0m be that 3745kV(operated discharge voltage U equals the overvoltage value required value and multiply by correction factor K
Am), then according to height above sea level 0m air gap discharge voltage profile, obtain the value of the gap d of 3745kV operated discharge voltage correspondence.This gap d is exactly the minimal design insulation distance that the alternate switching overvoltage of soft bus requires when height above sea level 3000m.
The discharge in insulation attribute testing is carried out in (height above sea level 23m), Xining (height above sea level 2254m) and three testing sites of Golog (height above sea level 3742m) in Wuhan beyond the present embodiment, and is specific as follows:
Determine the parameter value of the modifying factor m of height above sea level correction factor with the testing site of Wuhan, Xining, three different altitude heights of Golog.In Wuhan, Xining, Golog three ground adopts identical set: 500kV transformer station simulates soft bus and adopts the steel pipe of identical caliber to make, and caliber is 60mm, and heading spacing is 400mm.In the test, in order to prevent the wire termination paradoxical discharge, arc is processed in soft bus end, and installs the even shading ring that diameter is 500mm additional.Distance between the two soft buses is respectively 5m, 6m, 7m, 8m, and soft bus is 12m to ground level.The surge voltage of phase insulation test not only depends on the generating positive and negative voltage sum, and depends on the ratio that generating positive and negative voltage is shared.With voltage distribution coefficient α=U
-/ (U
++ U
-) represent the allocation proportion of generating positive and negative voltage component, 500kV system overvoltage simulation result shows that when alternate maximum switching overvoltage occurred, the voltage distribution factor alpha was approximately equal to 0.4, so main α=0.4 research experiment that adopts of test.
The impulse voltage generator that the testing site, Wuhan adopt to use two voltages to be respectively 5400kV and 3600kV is united and is carried out alternate test.Testing site, two places, Qinghai all makes the portable impulse voltage generator of 3600kV, 4200kV.Three ground test voltages all adopt the standard operation ripple of 250/2500 μ s, and the relevant device accuracy of measurement system all satisfies test requirements document, the overall uncertainty of measuring voltage peak value＜3%.The surge voltage control system adopts the surge voltage automatic control system of optical fiber isolation and Computer Control Technology, can realize all digitlizations such as charging, triggering, data acquisition, have stable performance, the reliability height, antijamming capability is strong, the characteristics of data good reproducibility.Adopt identical test product, be mainly soft bus.Adopt the actual substation operation operating mode of simulation to arrange during test.
Present embodiment is revised the alternate switching impulse of soft bus of high altitude localities 500kV transformer station by the inventive method, will adopt correction result U of the present invention and the correction result that adopts GB311.1 and IEC60071 correction formula to compare simultaneously.
Correction result of the present invention refers to adopt correction formula that the switching impulse sparkover voltage value of different altitude height is adapted to the magnitude of voltage that obtains behind the height above sea level 0m, uses U here
0Expression.
In the alternate switching impulse test height above sea level of the soft bus correction of Wuhan, Xining and three testing sites of Golog, from height above sea level corrected Calculation result, the height above sea level correction factor that three ground result of the tests calculate by the present invention is adapted to the correction result U of height above sea level 0m
0w, U
0xAnd U
0g, its absolute deviation mean value of proofreading and correct the result is 3.86%, maximum deviation is less than 5.7%; The absolute value average deviation that adopts IEC60071 to proofread and correct the result is 7.3%, and maximum deviation is less than 10.5%; The absolute value average deviation that adopts GB311.1 to proofread and correct the result is 20.4%, so maximum deviation obviously is better than the altitude correcting method of IEC60071 and GB311.1 in the correction of operation Impulse Test Result under test height above sea level condition less than 24.8% the present invention.
Claims (2)
1. the minimum insulation distance is determined method between the soft bus of high altitude localities 500kV transformer station, it is characterized in that, comprising:
(1) carry out linear fit according to the Different Altitude point 500kV transformer station alternate switching overvoltage value of soft bus, obtain the modifying factor m of height above sea level correction factor:
m=-0.0003U+1.2384
In the formula, U is switching overvoltage, the MV of unit;
(2) adopt switching impulse discharge correction formula, obtain height above sea level correction factor K
Am:
In the formula, H is height above sea level, 23m≤H≤3742m;
(3) with described height above sea level correction factor K
AmMultiply by the alternate switching overvoltage required value of the soft bus of 500kV transformer station, obtain required minimum insulation between the soft bus of high height above sea level place 500kV transformer station apart from the operated discharge voltage U of d when the height above sea level 0m, then according to height above sea level 0m air gap discharge voltage profile, the gap d of the operated discharge voltage U correspondence when obtaining described height above sea level 0m
0, this gap d
0Be between the soft bus of high height above sea level place 500kV transformer station required minimum insulation apart from d.
2. determine method according to minimum insulation distance between the soft bus of claim 1 described high altitude localities 500kV transformer station, it is characterized in that: the alternate switching overvoltage U required value of the soft bus of described 500kV transformer station is between 1.5MV～2.6MV.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104021269A (en) * | 2014-04-11 | 2014-09-03 | 中国电力工程顾问集团西南电力设计院 | Obtaining method for ground lightning and operation impulse altitude correction values of 500kV electric equipment at altitude of 2km-4km |
| CN113949189A (en) * | 2020-07-15 | 2022-01-18 | 中车永济电机有限公司 | Electric machine |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0960456B1 (en) * | 1997-02-12 | 2005-12-21 | Abb Ab | Substation |
-
2013
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0960456B1 (en) * | 1997-02-12 | 2005-12-21 | Abb Ab | Substation |
Non-Patent Citations (2)
| Title |
|---|
| 孟刚等: "高海拔地区500KV变电站设备相间操作冲击放点特性", 《高电压技术》 * |
| 项立人: "高海拔地区500千伏变电站最小电气距离的选择", 《电网技术》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104021269A (en) * | 2014-04-11 | 2014-09-03 | 中国电力工程顾问集团西南电力设计院 | Obtaining method for ground lightning and operation impulse altitude correction values of 500kV electric equipment at altitude of 2km-4km |
| CN104021269B (en) * | 2014-04-11 | 2017-07-07 | 中国电力工程顾问集团西南电力设计院有限公司 | The acquisition methods of 2km 4km height above sea level 500kV electrical equipments relatively thunder and lightning and switching impulse height above sea level correction value |
| CN113949189A (en) * | 2020-07-15 | 2022-01-18 | 中车永济电机有限公司 | Electric machine |
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Application publication date: 20131009 |