CN106771755A - A kind of transformer oil Aging of Oil-paper Insulation in Oil state analyzing method based on return voltage - Google Patents
A kind of transformer oil Aging of Oil-paper Insulation in Oil state analyzing method based on return voltage Download PDFInfo
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- CN106771755A CN106771755A CN201611230924.6A CN201611230924A CN106771755A CN 106771755 A CN106771755 A CN 106771755A CN 201611230924 A CN201611230924 A CN 201611230924A CN 106771755 A CN106771755 A CN 106771755A
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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
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Abstract
The invention discloses a kind of transformer oil Aging of Oil-paper Insulation in Oil state analyzing method based on return voltage, including step：The return voltage characteristic quantity of 1 pair of system is measured；2 set up homogeneous dielectric circuit equivalent model；3 pairs of equivalent circuits of return voltage emulate and obtain return voltage curve；4 pairs of return voltage curves are fitted the initial slope for obtaining return voltage；5 observe the change of return voltage initial slope by changing the paper insulated test parameters of transformer oil and equivalent circuit parameter；6 according to above step, judges transformer oil Aging of Oil-paper Insulation in Oil situation.The present invention is based on homogeneous dielectric circuit model using the initial slope of another key character amount return voltage, goes to diagnose transformer aging performance.Under equal conditions, the initial slope of return voltage is smaller, and the insulation status of transformer are better, for the assessment of transformer insulated situation provides new thinking and method.
Description
Technical field
The invention belongs to Electric Power Equipment Insulation state estimation technical field, a kind of change based on return voltage method of specific design
Depressor paper oil insulation aging performance is based on the new analysis method of return voltage initial slope.
Background technology
With the continuous upgrading of power system, net capacity constantly increases, for the reliability for improving power system
It is more and more important with stability.Power transformer is essential electrical equipment in power system, is responsible in operation of power networks
Conversion and transmission energy, the security and reliability to electric power system play an important role.To transformer oil Aging of Oil-paper Insulation in Oil situation
Research, can effectively safeguard the normal operation of power equipment, it is to avoid because insulation ag(e)ing makes transformer terminate their make in advance
With the life-span, at the same reduce the power equipment caused by the catastrophic failure of large-scale paper oil insulation transformer to stop transport and caused by be difficult to
The normal life of state's economic loss and influence some areas people of estimation.Overhauled and updated in time, pacify power system
Row for the national games.
Because the paper oil insulation of transformer receives temperature, geometry, degree of aging and moisture and other chemical reactions
Influence can change the conductance and polarization process of electrolyte, cause the insulating properties of transformer to change.Therefore dielectric is used
Response technology detects the paper oil insulation state of power transformer.Dielectric response method is broadly divided into time domain method and frequency domain method at this stage
Both of which is that, without destructive detection method, time domain method has return voltage method (RVM) and polarization depolarization current method (PDC), operation
It is simple to carry a large amount of abundant informations simultaneously, humidity and temperature are not required to reduce the sampling of transformer suspended core in air during operation to becoming
Transformer coil, the influence of insulating oil, and strong antijamming capability, reduce the destruction of insulating materials.Frequency domain method has dielectric spectroscopy
Method (FDS) can preferably filter noise decrease infection in high frequency, have outstanding advantage in terms of dielectric loss is studied.
Existing research now is mostly to go diagnosis transformer oilpaper exhausted using return voltage polarized spectrum and main time constant
Edge situation is easily aging by transformer and make moist and influenceed, it is therefore desirable to use the initial oblique of another key character amount return voltage
Rate is based on the relation of homogeneous dielectric circuit model and transformer oil Aging of Oil-paper Insulation in Oil situation.
The content of the invention
It is an object of the invention to provide a kind of transformer oil Aging of Oil-paper Insulation in Oil status analysis based on return voltage method
New method, because the aging and meeting of making moist of transformer produces influence, therefore proposition use back polarized spectrum and main time constant
Another feature amount return voltage initial slope of complex voltage diagnoses transformer oil Aging of Oil-paper Insulation in Oil situation, Researching The Equivalent circuit ginseng
Number and influence of the test parameters to the initial slope of return voltage.It is easy to operate, will not destroy transformer insulated.
Technical scheme is as follows：
A kind of transformer oil Aging of Oil-paper Insulation in Oil state analyzing method for being based on return voltage method, comprises the following steps：
S1：Return voltage characteristic quantity to system is measured；
S2：Set up homogeneous dielectric equivalent-circuit model；
S3：Equivalent circuit to return voltage is emulated, and draws return voltage curve；
S4：Return voltage curve is fitted, return voltage initial slope is drawn；
S5：Change test parameters and equivalent circuit parameter, observe the change of return voltage initial slope；
S6：According to above step, transformer oil Aging of Oil-paper Insulation in Oil situation is judged.
The method that the step S2 sets up homogeneous dielectric equivalent circuit：According to linear homogeneous theory, dielectric
Polarization process can be represented with a relation of time τ by single debye equivalent circuit.
The homogeneous model that the step S3 is based on return voltage calculates return voltage value, can obtain the side of return voltage curve
Method：The computing formula that circuit equation formulation equation group according to relaxation branch road can obtain return voltage is as follows：
Computing circuit equation group is set up according to KCL and KVL laws
There is the formula of (1)~(2) two to eliminate I (s), then can obtain：
A=R in formulagCgRpCp, b=RgCg+RpCp+RgCp, can be obtained by (3)
Wherein p1,p2It is the limit of transfer function,
(4) can be obtained after known circuit parameter is updated into (3) abbreviation, can be obtained after (4) are carried out with Laplace Transform calculating
Wherein
The step S4 goes out return voltage initial slope based on the return voltage derivation of equation, and for a polarization branch road, it is public
Formula is：
WhereinIt is return voltage initial slope, CgIt is geometric capacitance, RpIt is polarization resistance, tcIt is charging interval, td
It is discharge time, τ=RpCpIt is the relaxation time.
The step S4 is to be based on step S3, the return voltage that can be smoothed to return voltage curve matching with MATLAB
Initial slope.
The step S5 is that the initial slope formula of the return voltage based on step S4 understands test parameters and equivalent circuit
Parameter has an impact to return voltage initial slope, changes test parameters charging voltage U0With the discharge and recharge time than k and equivalent circuit
Parametric geometry resistance Rg, geometric capacitance Cg, polarization resistance RpWith polarization capacity Cp, observe the change of return voltage initial slope.
The step S6 according to the change of return voltage initial slope understand insulation status change, return voltage it is initial
Slope changes with the change of test parameters.
Beneficial effects of the present invention：
Propose that development test parameter and equivalent circuit parameter are to returning on the basis of homogeneous dielectric equivalent model first
The influence of complex voltage initial slope, and the paper oil insulation of the Changing Pattern diagnosis transformer for passing through return voltage initial slope is aging
Situation.The initial slope of return voltage is the important parameter of insulation ag(e)ing, and diagnostic method of the invention is relatively easy to, simply.This
Invention can be applied in the diagnosis of various transformer oil Aging of Oil-paper Insulation in Oil extensively.
Brief description of the drawings
Fig. 1 is the new method of the transformer oil Aging of Oil-paper Insulation in Oil status analysis based on return voltage method proposed by the present invention
Flow chart.
Fig. 2 is homogeneous dielectric circuit model proposed by the present invention.
Fig. 3 is the return voltage initial slope curve that the present invention is obtained by return voltage curve matching.
Fig. 4 changes charging voltage U for the present invention0The return voltage initial slope curve for obtaining afterwards.
Fig. 5 is that the present invention changes the discharge and recharge time than the return voltage initial slope curve that is obtained after k.
Fig. 6 is the constant change (R of retention time constant of the inventionp,Cp) after the return voltage initial slope curve that obtains.
Fig. 7 (a) individually changes geometry resistance R for the present inventiongWhen the return voltage initial slope curve that obtains.
Fig. 7 (b) individually changes geometric capacitance C for the present inventiongWhen the return voltage initial slope curve that obtains.
Fig. 8 (a) individually changes polarization resistance R for the present inventionpWhen the return voltage initial slope curve that obtains.
Fig. 8 (b) individually changes polarization capacity C for the present inventionpWhen the return voltage initial slope curve that obtains.
Fig. 9 is the return voltage initial slope curve of the transformer before and after maintenance proposed by the present invention.
Specific embodiment
Below in conjunction with accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described.
Implementation example of the invention is described below in detail, the example of the embodiment is shown in the drawings, wherein ad initio extremely
Same or similar label represents same or similar element or the element with same or like function eventually.Below with reference to
The implementation example of Description of Drawings is exemplary, is only used for explaining the present invention, and is not considered as limiting the invention.
Technical scheme is described in detail below in conjunction with the accompanying drawings：
As shown in figure 1, the present invention proposes a kind of transformer oil Aging of Oil-paper Insulation in Oil status analysis side based on return voltage method
Method, comprises the following steps：
S1：Return voltage characteristic quantity to system is measured；
Using measuring instrument RVM5461 to a SFSZ210-18000/220 under different charging intervals and discharge time,
The equipment can automatic measurement return voltage value, reach the characteristic quantity such as time to peak, and can obtain return voltage polarized spectrum.
S2：Set up homogeneous dielectric equivalent model；
According to linear homogeneous theory, the polarization process of dielectric is equivalent by single debye with a relation of time τ
Circuit is represented.Will not be homogeneous during due to dielectric polarization, single capacitor model can not really reflect polarization of dielectric,
Therefore with electric capacity and resistant series come the polarization of equivalent material.Its model is as shown in Figure 2.
S3：Equivalent circuit to return voltage is emulated, and draws return voltage curve.
Homogeneous model based on return voltage calculates return voltage value, obtains return voltage curve.According to relaxation branch road
Circuit equation formulation equation group can obtain return voltage computing formula it is as follows：
Computing circuit equation group can be set up according to KCL and KVL laws
Wherein, U (s) is return voltage value,It is the voltage at polarization capacity two ends, RpIt is polarization resistance, CpIt is polarization
Electric capacity, RgIt is geometry resistance, CgIt is geometric capacitance.
There is the formula of (1)~(2) two to eliminate I (s), then can obtain：
A=R in formulagCgRpCp, b=RgCg+RpCp+RgCp。
(4) can be obtained after known circuit parameter is updated into (3) abbreviation,
Wherein p1,p2It is the limit of transfer function,
(4) are carried out to obtain return voltage expression formula after Laplace Transform calculating and is：
Wherein
S4：Return voltage curve is fitted, return voltage initial slope curve is drawn；
Return voltage initial slope is gone out based on the return voltage derivation of equation, is for polarization branch road its formula：
WhereinIt is return voltage initial slope, CgIt is geometric capacitance, RpIt is polarization resistance, tcIt is charging interval, td
It is discharge time, τ=RpCpIt is the relaxation time.
Carrying out emulation fitting to above-mentioned formula with MATLAB can obtain return voltage initial slope, as shown in Figure 3.
S5：Change test parameters and equivalent circuit parameter, observe the change of return voltage initial slope.
When keeping equivalent circuit parameter constant, change test parameters U0Observation is to return voltage during for 1KV, 2KV, 3KV
The influence of initial slope, obtains result as shown in Figure 4；The change discharge and recharge time is initially oblique to return voltage when being 2,4,8 than k
The influence of rate, as shown in Figure 5.When keeping test parameters constant, retention time constant first is constant, changes (Rp,Cp) observe back
The change of complex voltage initial slope, as shown in Figure 6；Then the geometry branch road and polarization branch road for individually changing equivalent circuit are observed again
Influence to return voltage initial slope, as shown in Fig. 7~8.
MATLAB simulation analysis are carried out to transformer SFSZ210-18000/220 using the method, at the beginning of return voltage being obtained
The change of beginning slope, the homogeneous dielectric equivalent circuit of transformer is as follows：
The equivalent circuit parameter value of table 1
| Parameter | Rg/GΩ | Cg/nF | Rp/GΩ | Cp/nF |
| Numerical value | 9.55471 | 49.8962 | 0.11458 | 190.6023 |
S6：According to above step, transformer oil Aging of Oil-paper Insulation in Oil shape is judged by the change of the initial slope of return voltage
Condition；
By changing the paper insulated test parameters charging voltage U of transformer oil0With the discharge and recharge time than k, and homogeneous insulation
The parameter value of dielectric circuit model, research draws the relation of these parameters and return voltage initial slope.Simulation result shows to fill
Piezoelectric voltage and geometry branch parameters only influence the size of the initial slope of return voltage.The initial slope of return voltage is with polarization
The reduction of resistance and the increase of polarization capacity and increase.When the discharge and recharge time is than k=2, the determination of main time constant is more beneficial for.
By contrasting the return voltage initial slope before and after maintenance, it is found that return voltage initial slope can be used for judging transformer oilpaper
State of insulation, dU/dt is smaller, and Transformer Insulation Aging state is better, the return voltage initial slope before and after contrast maintenance, such as schemes
Shown in 9.
To sum up, the new method of transformer oil Aging of Oil-paper Insulation in Oil status analysis of the present invention based on return voltage method is to be based on back
On the basis of the polarized spectrum of complex voltage, return voltage initial slope is obtained by being fitted return voltage curve, change equivalent circuit
Change of the parameter to return voltage initial slope.Transformer oil paper insulation may determine that by the change of return voltage initial slope
It is aging, solve by the polarized spectrum of transformer easily by aging and make moist and influenceed.The present invention is lossless non-destructive inspection
Survey, the assessment of insulation status can be carried out to the paper oil insulation structure of the oil-filled transformer of permanent operation, judge transformer oil
Paper insulated aging performance.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " illustrative examples " or
The description of " example " etc. means that the specific features, structure, material or the feature that are described with reference to the embodiment or example are contained in this
In at least one embodiment or example of invention.In this manual, the schematic representation to above-mentioned term is not necessarily referring to
Identical embodiment or example.And, the specific features of description, structure, material or feature can be at any one or many
Combined in an appropriate manner in individual embodiment or example.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that not taking off
Various changes, modification, replacement and modification, this hair can be carried out to these embodiments in the case of the principle of the invention and objective
Bright scope is limited by claim and its equivalent.
Claims (7)
1. a kind of transformer oil Aging of Oil-paper Insulation in Oil state analyzing method based on return voltage, it is characterised in that including following step
Suddenly：
S1：Return voltage characteristic quantity to system is measured；
S2：Set up homogeneous dielectric equivalent-circuit model；
S3：Equivalent circuit to return voltage is emulated, and draws return voltage curve；
S4：Return voltage curve is fitted, return voltage initial slope is drawn；
S5：Change test parameters and equivalent circuit parameter, observe the change of return voltage initial slope；
S6：According to above step, transformer oil Aging of Oil-paper Insulation in Oil situation is judged.
2. a kind of transformer oil Aging of Oil-paper Insulation in Oil state analyzing method based on return voltage according to claim 1, its
It is characterised by, the implementation method of the step S1：Using measuring instrument to transformer under different charging intervals and discharge time,
Measurement return voltage value, arrival time to peak, and obtain return voltage polarized spectrum.
3. a kind of transformer oil Aging of Oil-paper Insulation in Oil state analyzing method based on return voltage according to claim 1, its
It is characterised by, the implementation method of the step S2：According to linear homogeneous theory, the polarization process of dielectric and a time τ
Relation represented by single debye equivalent circuit, and using electric capacity and resistant series come the polarization of equivalent material.
4. a kind of transformer oil Aging of Oil-paper Insulation in Oil state analyzing method based on return voltage according to claim 1, its
It is characterised by, the implementation method of the step S3：Homogeneous model based on return voltage calculates return voltage value, is replied
Voltage curve；The computing formula that circuit equation formulation equation group according to relaxation branch road can obtain return voltage is as follows：
Computing circuit equation group can be set up according to KCL and KVL laws
I (s) is eliminated by two formulas above, the expression formula of the ratio between return voltage and polarization capacity voltage is obtained：
A=R in formulagCgRpCp, b=RgCg+RpCp+RgCp；
Known circuit parameter is updated to the expression formula of the ratio between return voltage and polarization capacity voltage, is simplified after abbreviation
The expression formula of the ratio between return voltage and polarization capacity voltage：
Wherein p1,p2It is the limit of transfer function,
Can be replied after carrying out Laplace Transform calculating to the expression formula of the ratio between the return voltage after simplification and polarization capacity voltage
Voltage expression：
Wherein
5. a kind of transformer oil Aging of Oil-paper Insulation in Oil state analyzing method based on return voltage according to claim 4, its
It is characterised by, the implementation method of the step S4：Return voltage initial slope is gone out based on the return voltage derivation of equation, for one
Polarization branch road its formula is：
WhereinIt is return voltage initial slope, CgIt is geometric capacitance, RpIt is polarization resistance, tcIt is charging interval, tdTo put
Electric time, τ=RpCpIt is the relaxation time；
Carrying out emulation fitting to initial slope formula with MATLAB can obtain return voltage initial slope.
6. a kind of transformer oil Aging of Oil-paper Insulation in Oil state analyzing method based on return voltage according to claim 1, its
It is characterised by, the implementation method of the step S5：When keeping equivalent circuit parameter constant, change test parameters U0For 1KV,
Influence of the observation to return voltage initial slope when 2KV, 3KV；Change the discharge and recharge time than k be 2,4,8 when at the beginning of return voltage
The influence of beginning slope；When keeping test parameters constant, retention time constant first is constant, changes (Rp,Cp) observation return voltage
The change of initial slope；Then the geometry branch road and polarization branch road for observing individually change equivalent circuit again are initially oblique to return voltage
The influence of rate.
7. a kind of transformer oil Aging of Oil-paper Insulation in Oil state analyzing method based on return voltage according to claim 1, its
It is characterised by, the implementation method of the step S6：Hour is got in dU/dt, judges that the state of Transformer Insulation Aging is better.
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| CN108387824A (en) * | 2018-02-05 | 2018-08-10 | 三峡大学 | A kind of paper oil insulation state evaluating method improving recovery voltage measurement mode |
| CN110175760A (en) * | 2019-05-14 | 2019-08-27 | 福州大学 | A kind of paper oil insulation method for diagnosing status of return voltage and depolarization current composite character amount |
| CN110333411A (en) * | 2019-07-18 | 2019-10-15 | 中国计量科学研究院 | A kind of high-voltage capacitance voltage coefficient measuring device and method based on electrode displacement amount |
| CN110531230A (en) * | 2019-09-11 | 2019-12-03 | 厦门理工学院 | A kind of transformer oil paper insulation system aging method for diagnosing status |
| CN110542816A (en) * | 2019-09-11 | 2019-12-06 | 厦门理工学院 | method for drawing return voltage polarization spectrum, terminal device and storage medium |
| CN110542815A (en) * | 2019-09-11 | 2019-12-06 | 厦门理工学院 | method for drawing reply voltage initial slope spectral line, terminal device and storage medium |
| CN110542840A (en) * | 2019-09-11 | 2019-12-06 | 厦门理工学院 | Return voltage curve drawing method, terminal device and storage medium |
| CN110542841A (en) * | 2019-09-11 | 2019-12-06 | 厦门理工学院 | Aging state diagnosis method for transformer oil paper insulation system |
| CN113899997A (en) * | 2021-11-10 | 2022-01-07 | 哈尔滨理工大学 | Transformer insulation state diagnosis method based on improved support vector machine |
| CN115015684A (en) * | 2022-08-10 | 2022-09-06 | 山东和兑智能科技有限公司 | High-voltage bushing digital evaluation method and system based on time-frequency domain feature fusion |
| CN115561592A (en) * | 2022-09-29 | 2023-01-03 | 海南电网有限责任公司电力科学研究院 | Oil paper insulation aging degree accurate evaluation method based on time domain dielectric spectrum |
| CN117554762A (en) * | 2023-11-17 | 2024-02-13 | 国网宁夏电力有限公司电力科学研究院 | Transformer insulation part aging model building method, medium and system |
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| CN108387824A (en) * | 2018-02-05 | 2018-08-10 | 三峡大学 | A kind of paper oil insulation state evaluating method improving recovery voltage measurement mode |
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| CN110333411A (en) * | 2019-07-18 | 2019-10-15 | 中国计量科学研究院 | A kind of high-voltage capacitance voltage coefficient measuring device and method based on electrode displacement amount |
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| CN110542815A (en) * | 2019-09-11 | 2019-12-06 | 厦门理工学院 | method for drawing reply voltage initial slope spectral line, terminal device and storage medium |
| CN110542841A (en) * | 2019-09-11 | 2019-12-06 | 厦门理工学院 | Aging state diagnosis method for transformer oil paper insulation system |
| CN110542816A (en) * | 2019-09-11 | 2019-12-06 | 厦门理工学院 | method for drawing return voltage polarization spectrum, terminal device and storage medium |
| CN110531230A (en) * | 2019-09-11 | 2019-12-03 | 厦门理工学院 | A kind of transformer oil paper insulation system aging method for diagnosing status |
| CN113899997A (en) * | 2021-11-10 | 2022-01-07 | 哈尔滨理工大学 | Transformer insulation state diagnosis method based on improved support vector machine |
| CN115015684A (en) * | 2022-08-10 | 2022-09-06 | 山东和兑智能科技有限公司 | High-voltage bushing digital evaluation method and system based on time-frequency domain feature fusion |
| CN115561592A (en) * | 2022-09-29 | 2023-01-03 | 海南电网有限责任公司电力科学研究院 | Oil paper insulation aging degree accurate evaluation method based on time domain dielectric spectrum |
| CN117554762A (en) * | 2023-11-17 | 2024-02-13 | 国网宁夏电力有限公司电力科学研究院 | Transformer insulation part aging model building method, medium and system |
| CN117554762B (en) * | 2023-11-17 | 2024-04-26 | 国网宁夏电力有限公司电力科学研究院 | Transformer insulation part aging model building method, medium and system |
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