CN108663597A - Shorted-turn fault method for detecting position based on smoothing reactor changes of magnetic field - Google Patents
Shorted-turn fault method for detecting position based on smoothing reactor changes of magnetic field Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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Abstract
The invention discloses a kind of shorted-turn fault method for detecting position based on smoothing reactor changes of magnetic field, on the basis of ensureing per layer line this parameter constant of cycle basis, every layer of reactor winding simplification is equivalent to a hollow cylinder, builds simplified smoothing reactor model；The abort situation detection function between failure relative altitude and changes of magnetic field percentage is built, using fixed variable method, i.e., the magnetic field function of many variables fitting of reactor is reduced to function of a single variable fitting, form abort situation detection function simplifies expression；Its magnetic field intensity is detected in real time and carries out comparison with magnetic field intensity when its normal operation obtains changes of magnetic field amount, the front and back change of magnetic field strength amount that breaks down is substituted into the abort situation detection function after simplifying expression, obtains the relative altitude that shorted-turn fault occurs.
Description
Technical field
The present invention relates to a kind of shorted-turn fault method for detecting position based on smoothing reactor changes of magnetic field.
Background technology
Dry-type air-core reactor (Dry-type Air-core Reactors, DAR) is at home and abroad widely used, however one
Shorted-turn fault occurs for denier, and the high current generated in short-circuited conducting sleeve can damage coil, or even burn reactor and then draw
Play fire.As one of most common failures of DAR, it is necessary to find effective method and detect its turn-to-turn insulation, find to set in time
Standby irregular operating state, prevents the generation of shorted-turn fault.
For reactor interturn short circuit problem, many experts and scholars study and propose a variety of detection methods.But these sides
Method has the shortcomings that certain：
Electrical quantity detection method：The variation of the parameters such as voltage, electric current, accurate and effective can be directly detected, but early warning cannot be reached
Purpose；
Cigarette sense detection method：The flue gas that detection overheat burning generates, principle are simply easily realized, but affected by environment larger, essence
Exactness is poor；
Temperature detection method：Fault zone heat condition is detected, more intuitively, but detection promptness is slightly worse, and sensor selects
It selects and difficult arrangement；
Stress induction detection method：Turn-to-turn stress mutation is detected, but easily by ectocine, and had to transducer sensitivity higher
It is required that；
Search coil detection method：Detection short-circuited conducting sleeve is vortexed the voltage waveform induced in search coil, has real-time prison
Control ability, but it is not sensitive enough to betiding the fault reaction in reactor horizontal axis.To sum up, existing detection method respectively have advantage but
Measurement degree of freedom is weaker, i.e., test position is relatively fixed, is not easy to installing and dismounting and extension, therefore in the base for ensureing accuracy of detection
On plinth, it is very necessary to seek a kind of more free easily detection method.
Invention content
The present invention is to solve the above-mentioned problems, it is proposed that a kind of shorted-turn fault based on smoothing reactor changes of magnetic field
Method for detecting position, the present invention place magnetic field measuring instrument, detect its magnetic field intensity in real time by establishing simplified model, measurement point
And carry out comparison with magnetic field intensity when its normal operation and obtain changes of magnetic field amount, by the front and back change of magnetic field strength that breaks down
Amount substitutes into abort situation detection function and can be obtained the relative altitude that shorted-turn fault occurs, and has calculating process simple, meter
Calculate the high advantage of result accuracy.
To achieve the goals above, the present invention adopts the following technical scheme that：
A kind of shorted-turn fault method for detecting position based on smoothing reactor changes of magnetic field, includes the following steps：
On the basis of ensureing per layer line this parameter constant of cycle basis, by the simplification of every layer of reactor winding be equivalent to one it is hollow
Cylinder, build simplified smoothing reactor model；
The abort situation detection function between failure relative altitude and changes of magnetic field percentage is built, using fixed variable
The magnetic field function of many variables fitting of reactor is reduced to function of a single variable fitting, forms the simplification of abort situation detection function by method
Expression；
Its magnetic field intensity is detected in real time and carries out comparison with magnetic field intensity when its normal operation obtains changes of magnetic field amount, it will
The front and back change of magnetic field strength amount that breaks down substitutes into the abort situation detection function after simplifying expression, obtains that turn-to-turn short circuit occurs
The relative altitude of failure.
Further, smoothing reactor is formed in parallel by lattice coil, close-packed arrays between coil and coil, identical journey
The shorted-turn fault of degree betides the variation of the space magnetic field caused by the different coil layers of reactor and is less than setting range.
Further, the simplified model of smoothing reactor is：Every layer of reactor winding is simplified be equivalent to one it is hollow
Cylinder, smoothing reactor are formed by multiple cylinder laid out in parallel, per adjacent several cylinders as one group, every group it
Between be provided with heat dissipation channel, every group of cylinder is set in encapsulating.
Further, the position for reactor being located at according to the center of shorted-turn fault carries out subregion.
Preferably, the position of reactor total height is located at according to the center of shorted-turn fault, is divided into three regions.
Further, to the fitting of shorted-turn fault position function just for failure relative altitude and changes of magnetic field percentage
Relationship is studied than between.
Further, when shorted-turn fault occurs for reactor, the distribution of reactor space magnetic field is by Multiple factors
It influences, is not considering reactor ambient enviroment magnetic field and reactor influence ideally, reactor interturn short circuit event
Relationship between barrier changes of magnetic field and abort situation belongs to nonlinear multivariable relationship.
Further, according to reactor feature, reactor interturn short circuit fault position only passes through relative radius and phase
Height is indicated；The changes of magnetic field percentage score in ATC and the directions LTC is utilized into shorted-turn fault degree, the directions ATC and LTC
The measurement point and relative radius in magnetic field are indicated with relative altitude, form the solving model of Reactor Fault position function.
A kind of shorted-turn fault position detecting system based on smoothing reactor changes of magnetic field, runs on processor or deposits
On reservoir, it is configured as executing to give an order：
On the basis of ensureing per layer line this parameter constant of cycle basis, by the simplification of every layer of reactor winding be equivalent to one it is hollow
Cylinder, build simplified smoothing reactor model；
The abort situation detection function between failure relative altitude and changes of magnetic field percentage is built, using fixed variable
The magnetic field function of many variables fitting of reactor is reduced to function of a single variable fitting, forms the simplification of abort situation detection function by method
Expression；
Its magnetic field intensity is detected in real time and carries out comparison with magnetic field intensity when its normal operation obtains changes of magnetic field amount, it will
The front and back change of magnetic field strength amount that breaks down substitutes into the abort situation detection function after simplifying expression, obtains that turn-to-turn short circuit occurs
The relative altitude of failure.
A kind of shorted-turn fault position detecting system based on smoothing reactor changes of magnetic field, further includes division module,
It is located at the position of reactor total height according to the center of shorted-turn fault, is divided into three regions.
Compared with prior art, beneficial effects of the present invention are：
1, the present invention is by building abort situation function, can detect in real time its magnetic field intensity and with when its normal operation
Magnetic field intensity carries out comparison and obtains changes of magnetic field amount, after the front and back change of magnetic field strength amount that will break down substitutes into simplified expression
Abort situation detection function, obtains the relative altitude that shorted-turn fault occurs, and result of calculation has real-time；
2, the present invention can prove that the accuracy of the abort situation function of structure is high, have application prospect by verification.
Description of the drawings
The accompanying drawings which form a part of this application are used for providing further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation do not constitute the improper restriction to the application for explaining the application.
Fig. 1 (a) is the actual distribution schematic diagram of two dimensional model coil；
Fig. 1 (b) is the schematic diagram after simplifying processing of two dimensional model coil；
Fig. 2 is Reactor Fault position subregion schematic diagram；
Fig. 3 is magnetic field observation point distribution schematic diagram；
Fig. 4 is electric reactor magnetic field distribution measuring direction；
Fig. 5 (a) is the detection function matched curve of abort situation observation point C；
Fig. 5 (b) is the detection function matched curve of abort situation observation point E；
Wherein, radial central axis (Axial Traverse inCenter, ATC), radial side axis (Axial
Traverse inSide, ATS), transverse central axis (Lateral Traverse in Center, LTC), lateral top end shaft
(Lateral Traversein Top, LTT), lateral jackshaft (Lateral Traverse halfway between LTT
and LTC,LTH)。
Specific implementation mode：
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific implementation mode, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative
It is also intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or combination thereof.
In the present invention, term for example "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", " side ",
The orientation or positional relationship of the instructions such as "bottom" is to be based on the orientation or positional relationship shown in the drawings, only to facilitate describing this hair
Bright each component or component structure relationship and the relative of determination, not refer in particular to either component or element in the present invention, cannot understand
For limitation of the present invention.
In the present invention, term such as " affixed ", " connected ", " connection " shall be understood in a broad sense, and indicate may be a fixed connection,
Can also be to be integrally connected or be detachably connected；It can be directly connected, it can also be indirectly connected through an intermediary.For
The related scientific research of this field or technical staff can determine the concrete meaning of above-mentioned term in the present invention as the case may be,
It is not considered as limiting the invention.
The present invention detects its magnetic field intensity in real time by placing magnetic field measuring instrument in the specific measurement point of smoothing reactor
And carry out comparison with magnetic field intensity when its normal operation and obtain changes of magnetic field amount, by the front and back change of magnetic field strength that breaks down
Amount substitutes into abort situation detection function and can be obtained the relative altitude that shorted-turn fault occurs.
First, shorten the modeling time to simplify to model, ensureing per layer line circle basic parameter (i.e. diameter and coil height)
On the basis of, every layer of reactor winding, which can simplify, is equivalent to a hollow cylinder, the actual coil established herein point
Shown in cloth such as Fig. 1 (a).Its simplify it is equivalent after reactor cross section spread pattern such as Fig. 1 (b) shown in.
It is defined as when the center of shorted-turn fault is located at 2/3 or more reactor total height " top failure ", in failure
The heart is defined as " middle part failure " less than total height 2/3 and when being higher than 1/3, and defect center is defined as " lower part failure " when being less than 1/3,
Abort situation distribution schematic diagram is as shown in Figure 2.
Reactor is formed in parallel by lattice coil, close-packed arrays between coil and coil, the turn-to-turn short circuit of same degree
Failure betides the variation of the space magnetic field caused by the different coil layers of reactor and is not obvious.To shorted-turn fault position
The fitting of (being indicated with r* and h*) function is ground just for relationship between failure relative altitude h* and changes of magnetic field percent delta B
Study carefully, that is, it is respectively h* and Δ B to be fitted independent variable with dependent variable, and magnetic field observation point is C the and E points of Fig. 3, and Reactor Fault coil is solid
It is set to the coil layer of m=11, fault degree s is set as 16.875%.C points are apart from reactor center axial centre axis (Axial
Traverse in Center, ATC) at direction 1m points, E points are radially central shaft (Lateral Traverse in
Center, LTC) at direction 3m points.The directions ATC and LTC are as shown in Figure 4.
When shorted-turn fault occurs for reactor, the distribution of reactor space magnetic field is influenced by Multiple factors.Not
Consider that reactor ambient enviroment magnetic field and reactor influence ideally, reactor interturn short circuit fault changes of magnetic field
Relationship between abort situation apparently pertains to nonlinear multivariable.
According to reactor feature, reactor interturn short circuit fault position only passes through relative radius r*With relative altitude h*
It can indicate；ATC and the changes of magnetic field percentage in the directions LTC use Δ B respectivelyAWith Δ BLIt indicates；Shorted-turn fault degree, ATC
S, d is still respectively adopted with the measurement point in the directions LTC magnetic fieldAAnd dLIt indicates.Therefore, the solving model of Reactor Fault position function
It is represented by：
Wherein, f (h*, r*, s, dA) and g (h*, r*, s, dL) belongs to nonlinear function.
The Δ B in formula (1)A, Δ BL, h*And r*Calculation formula be：
Wherein, BAsAnd BA0Respectively reactor normal operation and shorted-turn fault ATC direction dAMagnetic field at distance is strong
Degree, BLsAnd BL0Corresponding LTC direction dLMagnetic field intensity at distance, r and h are respectively the radius and height of shorted-turn fault position
Degree, R and H are respectively reactor radius and height.
In actual function fitting application, since Multiple non-linear is more complicated and accuracy is relatively low.Therefore,
Function of many variables fitting is reduced to function of a single variable fitting by the fitting for the magnetic field function of reactor using fixed variable method.
Therefore, the reduced form of the abort situation detection function between Δ B and h* is：
Failure function expression formula between failure relative altitude and changes of magnetic field percentage is：
Magnetic field detector is placed in C points and E points, detects 2 changes of magnetic field in real time, and carries it into abort situation inspection
It surveys in function (4) and can be obtained abort situation.
Work as r*When=92.7%, s=16.875%, with the magnetic field at variation two observation points of C, E of abort situation h*
It is as shown in table 1 to change percentage.
1 observation point changes of magnetic field percentage of table
Respectively at two observation point of C, E changes of magnetic field Δ B and abort situation h* carry out curve fitting, fitted figure difference
As shown in Fig. 5 (a) and Fig. 5 (b).As seen from Figure 5, the relationship between Reactor Fault relative altitude and changes of magnetic field amount is using more
Item formula function is fitted excellent.
For the Function Fitting of the points of measurement evidence, fitting coefficient of determination R-square is smaller closer to 1, root mean square RMSE,
Function Fitting effect is better.Fitting effect of each curvilinear function to DAR failure relative altitudes in comparative analysis table 2, it is seen that：Four
Secondary curve is minimum closest to 1, root mean square to the failure relative altitude of observation point C, E fitting coefficient of determination.
2 abort situation model fitting effect analytical table of table
Further to verify the accuracy of the abort situation detection function fitted, is simulated using simulation model and turn-to-turn occurs
State when short-circuit, model choose the reactor parameter in table 3.Since detection function is to be directed to shorted-turn fault coil layer m
The changes of magnetic field amount to break down in the reactor of=11 and fault degree s=16.875% is fitted, and verify data is then selected
With failure coil layer m=11, fault degree s=16.875%, location of short circuit height h is set as 400mm, is obtained according to formula (2)
H*=21.98%.
3 observation point changes of magnetic field of table
Changes of magnetic field through simulation calculation reactor at C, E observation point is respectively 166.2949% and 2109.223%,
Data are brought into and solve h* in formula (2).Work as ΔWhen, acquire h*1=22.0105, h*2=-22.3129, h*3
=45.3332, h*4=-44.8673, wherein h*1It is closest with setting value, compare calculated value h*1With the mistake between setting value h*
Difference；Work as ΔWhen, acquire h*1=21.2521, h*2=-21.0029, h*3=40.5133, h*4=-
40.6106 wherein h*1It is closest with setting value, compare calculated value h*1With the error between setting value h*, comparison result such as table 3
It is shown.
In table 3, the calculation formula of absolute error and relative error is：
3 failure relative altitude solving result of table
From the result of calculation in table 3：Abort situation function result of calculation and actual set failure relative altitude are absolute
Error is less than 0.5, and relative error is also in allowable error range (0~10%).Result of calculation is verified and illustrates reactor event
Hinder relative altitude detection function accuracy, for practical smoothing reactor shorted-turn fault detect provide it is another detect according to
According to.
The foregoing is merely the preferred embodiments of the application, are not intended to limit this application, for the skill of this field
For art personnel, the application can have various modifications and variations.Within the spirit and principles of this application, any made by repair
Change, equivalent replacement, improvement etc., should be included within the protection domain of the application.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (10)
1. a kind of shorted-turn fault method for detecting position based on smoothing reactor changes of magnetic field, it is characterized in that：Including following
Step：
On the basis of ensureing per layer line this parameter constant of cycle basis, every layer of reactor winding simplification is equivalent to a hollow circle
Cylinder builds simplified smoothing reactor model；
The abort situation detection function between failure relative altitude and changes of magnetic field percentage is built, using fixed variable method, i.e.,
The magnetic field function of many variables fitting of reactor is reduced to function of a single variable fitting, form abort situation detection function simplifies expression；
Its magnetic field intensity is detected in real time and carries out comparison with magnetic field intensity when its normal operation and obtains changes of magnetic field amount, will be occurred
Change of magnetic field strength amount before and after failure substitutes into the abort situation detection function after simplifying expression, obtains that shorted-turn fault occurs
Relative altitude.
2. a kind of shorted-turn fault method for detecting position based on smoothing reactor changes of magnetic field as described in claim 1,
It is characterized in that：Smoothing reactor is formed in parallel by lattice coil, close-packed arrays between coil and coil, the turn-to-turn of same degree
Short trouble betides the variation of the space magnetic field caused by the different coil layers of reactor and is less than setting range.
3. a kind of shorted-turn fault method for detecting position based on smoothing reactor changes of magnetic field as described in claim 1,
It is characterized in that：The simplified model of smoothing reactor is：Every layer of reactor winding simplification is equivalent to a hollow cylinder, is put down
Wave reactor is formed by multiple cylinder laid out in parallel, per adjacent several cylinders as being provided between one group, every group
Heat dissipation channel, every group of cylinder are set in encapsulating.
4. a kind of shorted-turn fault method for detecting position based on smoothing reactor changes of magnetic field as described in claim 1,
It is characterized in that：The position for being located at reactor according to the center of shorted-turn fault carries out subregion.
5. a kind of shorted-turn fault method for detecting position based on smoothing reactor changes of magnetic field as claimed in claim 4,
It is characterized in that：It is located at the position of reactor total height according to the center of shorted-turn fault, is divided into three regions.
6. a kind of shorted-turn fault method for detecting position based on smoothing reactor changes of magnetic field as described in claim 1,
It is characterized in that：The fitting of shorted-turn fault position function is closed just between failure relative altitude and changes of magnetic field percentage
System is studied.
7. a kind of shorted-turn fault method for detecting position based on smoothing reactor changes of magnetic field as described in claim 1,
It is characterized in that：When shorted-turn fault occurs for reactor, the distribution of reactor space magnetic field is influenced by Multiple factors, not
Consider that reactor ambient enviroment magnetic field and reactor influence ideally, reactor interturn short circuit fault changes of magnetic field
Relationship between abort situation belongs to nonlinear multivariable relationship.
8. a kind of shorted-turn fault method for detecting position based on smoothing reactor changes of magnetic field as described in claim 1,
It is characterized in that：According to reactor feature, reactor interturn short circuit fault position only passes through relative radius and relative altitude table
Show；The changes of magnetic field percentage score in ATC and the directions LTC is utilized to the survey of shorted-turn fault degree, the directions ATC and LTC magnetic field
Amount point and relative radius are indicated with relative altitude, form the solving model of Reactor Fault position function.
9. a kind of shorted-turn fault position detecting system based on smoothing reactor changes of magnetic field, it is characterized in that：Run on place
It manages on device or memory, is configured as executing to give an order：
On the basis of ensureing per layer line this parameter constant of cycle basis, every layer of reactor winding simplification is equivalent to a hollow circle
Cylinder builds simplified smoothing reactor model；
The abort situation detection function between failure relative altitude and changes of magnetic field percentage is built, using fixed variable method, i.e.,
The magnetic field function of many variables fitting of reactor is reduced to function of a single variable fitting, form abort situation detection function simplifies expression；
Its magnetic field intensity is detected in real time and carries out comparison with magnetic field intensity when its normal operation and obtains changes of magnetic field amount, will be occurred
Change of magnetic field strength amount before and after failure substitutes into the abort situation detection function after simplifying expression, obtains that shorted-turn fault occurs
Relative altitude.
10. a kind of shorted-turn fault position detecting system based on smoothing reactor changes of magnetic field as claimed in claim 9,
It is characterized in that：Further include division module, the position of reactor total height is located at according to the center of shorted-turn fault, is divided into three
A region.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109444581A (en) * | 2018-11-06 | 2019-03-08 | 华北电力大学 | A kind of test method and test device of dry-type air-core reactor |
| CN109901005A (en) * | 2019-02-25 | 2019-06-18 | 国网山东省电力公司济南供电公司 | Shorted-turn fault detection method, system and the application of axial magnetic field difference |
| CN110531215A (en) * | 2019-08-29 | 2019-12-03 | 哈尔滨理工大学 | Iron-core reactor turn insulation Fault Locating Method and on-line monitoring system |
-
2018
- 2018-06-11 CN CN201810593774.8A patent/CN108663597A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109444581A (en) * | 2018-11-06 | 2019-03-08 | 华北电力大学 | A kind of test method and test device of dry-type air-core reactor |
| CN109901005A (en) * | 2019-02-25 | 2019-06-18 | 国网山东省电力公司济南供电公司 | Shorted-turn fault detection method, system and the application of axial magnetic field difference |
| CN110531215A (en) * | 2019-08-29 | 2019-12-03 | 哈尔滨理工大学 | Iron-core reactor turn insulation Fault Locating Method and on-line monitoring system |
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