CN100447575C - Method for identifying abnormal condition in power transformer - Google Patents
Method for identifying abnormal condition in power transformer Download PDFInfo
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- CN100447575C CN100447575C CNB031092098A CN03109209A CN100447575C CN 100447575 C CN100447575 C CN 100447575C CN B031092098 A CNB031092098 A CN B031092098A CN 03109209 A CN03109209 A CN 03109209A CN 100447575 C CN100447575 C CN 100447575C
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Abstract
A preferred method for identifying a type of abnormality in an insulation system of a power transformer comprises measuring dielectric losses in a section of the insulation system, calculating theoretical dielectric losses for the section based on the material properties, geometry, and temperature of the section, and generating a graphical representation of a percent difference between the measured and calculated dielectric losses. The preferred method also comprises comparing a shape of the graphical representation with a shape of one or more graphical representations of a percent difference between measured and theoretical dielectric losses in one or more other sections of insulation each known to have a specific type of abnormality.
Description
The present invention requires the U.S. Provisional Patent Application No.60/369 that proposed on April 3rd, 2002 under 35U.S.C § 119 (e), 671 right of priority, the quoting in full at this as reference of this U.S. Provisional Patent Application.
Invention field
The present invention relates to power transformer, more particularly, relate to the method that is used in power transformer identification abnormal conditions.
Background of invention
Power transformer typically comprises between various conductive paths or insulating material on every side.Insulating material is made by paper or cellulosic material usually.Mineral oil is usually also as the insulator in the power transformer.
Defective in the power transformer insulating material or other abnormal conditions can reduce the performance of power transformer, and under egregious cases, may cause peril.For example, moist and pollution can reduce the insulating property of oil, paper and cellulose insulation body.If insulator is exposed to than under the high voltage of rated voltage, the performance of insulator also reduces.In addition, defective such as breakage, space and other cracks and excessive moisture and carbon mark can reduce the performance of paper and cellulose insulation material.The insulating property of oil can be because aging, overheated or chemical contamination reduction.
Because insulating material is for the importance of the overall performance of power transformer, so often the insulating material of power transformer is carried out deagnostic test.For example, before coming into operation, power transformer to estimate the validity of the insulating material in the power transformer new or that do up recently usually.And, often periodically check the insulating material of power transformer in this area so that guarantee that insulating material is with satisfactory way work.
Most of normally used deagnostic tests that are used for the power transformer insulating material are applicable in for example appearance of defective of insulating material system identification abnormal conditions.For example, the what is called " power factor test " determined of American National Standards Institute (below have a detailed description) is commonly used to deagnostic test (the power factor test is tested identical with so-called " tan-δ " in fact).Although the diagnostic test such as the power factor (PF) test can be indicated the appearance of abnormal conditions, this inspection usually can not be indicated the type that abnormal conditions occur.
The particular type of identification abnormal conditions often need be drained and dismantling power transformer at least in part.For example, the excessive resistance in the power transformer magnetic core grounding circuit is excessive moisture in the power transformer cellulose insulation material by mistaken diagnosis sometimes.In other words, the diagnostic test of current use can be discerned the appearance of the abnormal conditions of these types, but usually can not distinguish these abnormal conditions.Therefore, there is the error message of excessive moisture in power transformer in the insulating material based on power transformer sometimes and suffers time-consuming and expensive drying course.
Therefore, need a kind ofly can in the power transformer insulation system, discern the appearance of abnormal conditions and the diagnostic method of identification abnormal conditions type.
Brief summary of the invention
Be used for comprising: in the area inner measuring dielectric loss of insulation system at the method for optimizing of a kind of abnormal conditions of power transformer insulation system identification; Theoretical dielectric loss based on the temperature computation zone in material behavior, geometric configuration and zone; And the diagrammatic representation that produces the percentage difference between the measurements and calculations dielectric loss.The measurement in described method for optimizing also comprises more figured shape and other the one or more known insulating regions with particular type abnormal conditions and the one or more figured shape of the percentage difference between the theoretical dielectric loss.
A kind of method for optimizing comprises: measure the dielectric frequency response in the insulating regions of power transformer; The theoretical dielectric frequency response of zoning; With the dielectric frequency response signature that produces the zone.Described method for optimizing also comprises the known dielectric frequency response signature with insulating regions of particular type abnormal conditions of comparison dielectric frequency response signature and other.
A kind of method for optimizing is used for the type of the abnormal conditions in the transformer insulated zone of labeled power supply, comprising: the lead that utilizes alternating voltage excitation insulating regions to isolate; In preset range, change the frequency of the alternating voltage between a plurality of discrete frequencies; With the dielectric loss of measuring at each place of discrete frequency in the insulating regions.
The theoretical dielectric loss that is used for insulating regions is calculated at each place that described method for optimizing also is included in discrete frequency; The percentage difference of measuring between dielectric loss and the theoretical dielectric loss is calculated at each place in discrete frequency; With at each the place's generation measurement dielectric loss of discrete frequency and the essence curve representation of the percentage difference between the calculating dielectric loss.Described method for optimizing also comprises the shape of comparison essence curve representation and is used for the measurement dielectric loss of known insulating regions with given shape abnormal conditions and calculates the shape that one or more predetermined curves of the percentage difference between the dielectric loss are represented.
Another kind of method for optimizing comprises: in response to the alternating voltage that changes in the frequency preset range, in the area inner measuring dielectric loss of power transformer insulation system; Theoretical dielectric loss based on the temperature computation zone of material behavior, geometric configuration and insulating regions; And the expression that produces the number percent between the measurements and calculations dielectric loss.Described method for optimizing also comprise determine this expression shape whether and the expression of the percentage difference between the measurements and calculations dielectric loss in the insulating regions with particular type abnormal conditions of other identification in advance be different in essence.
Another kind of method for optimizing is used for a kind of abnormal conditions of identification in the power transformer insulation system, comprising: in the area inner measuring dielectric loss of insulation system; The theoretical dielectric loss of zoning; Identified region when the theoretical dielectric loss by measurement dielectric loss in the comparison domain and zone has abnormal conditions.Described method for optimizing also comprises the diagrammatic representation that produces the percentage difference between the measurements and calculations dielectric loss; And the measurement in more described figured shape and known one or more other insulating regions with particular type abnormal conditions and the one or more figured shape of the percentage difference between the theoretical dielectric loss.
Another kind of method for optimizing comprises: the dielectric frequency response of measuring insulating regions in power transformer; The theoretical dielectric frequency response of zoning; With when responding identified region when having abnormal conditions by comparing and measuring dielectric response and theoretical electrolyte.Described method for optimizing comprises that also producing the dielectric frequency response that is used for the zone signs; With relatively dielectric frequency response signature and known other regional dielectric frequency response of insulation system with particular type abnormal conditions are signed.
Description of drawings
To understand above-mentioned summary and following preferred embodiment detailed description better with reference to accompanying drawing.For the present invention is described, present most preferred embodiment has been shown in the accompanying drawing.Yet, the invention is not restricted to disclosed concrete means in the accompanying drawing.In the accompanying drawings:
Fig. 1 is the process flow diagram that is used at the method for optimizing of a kind of abnormal conditions of power transformer insulation system identification;
Fig. 2 is can be in conjunction with the synoptic diagram of the power transformer of method shown in Fig. 1;
Fig. 3 is the simplicity of illustration of power transformer insulation system shown in Figure 2;
Fig. 4 has described a series of dielectric frequency response signatures that are used for from the insulating regions of power transformer, and wherein dielectric frequency response signature is corresponding with the different value of resistance in the magnetic core of transformer grounding circuit;
Fig. 5 has described the correction of the abnormal conditions that influence insulating regions and has signed with the dielectric frequency response that is used for insulating regions afterwards before;
Fig. 6 has described from having than the first dielectric frequency response signature of the insulating regions of first transformer of normal high magnetic core stake resistance with from the second dielectric frequency response signature of the insulating regions of second transformer with normal magnetic core stake resistance;
Fig. 7 has described the dielectric frequency response signature of the insulating regions that is used to have the humidity higher than normal level; With
Fig. 8 has described the dielectric frequency response signature of the insulating regions of showing chemical contamination.
The description of preferred embodiment
In Fig. 1, partly described and be used for discerning for example method for optimizing 10 of defective of abnormal conditions at the power transformer insulation system.Method 10 will be described together with the conventional power transformer 50 described among Fig. 2.The detail that relates to power transformer 50 only illustrates as the purpose of demonstration, and in fact method 10 can be used for the power transformer of any kind.
Power transformer 50 comprises the magnetic core 52 (magnetic core 52 comprises other stem stems, does not illustrate among Fig. 1) with stem stem 52a.Transformer 50 also comprises around the low-voltage coil 56 of stem stem 52a with around the high-tension coil 54 of low-voltage coil 56.Magnetic core 52, high-tension coil 54 and low-voltage coil 56 are contained in the shell 60.It should be noted that and roughly described transformer 50 among Fig. 1.Each element of transformer 50 does not illustrate in Fig. 1, and for clear, shows the space between some elements among Fig. 1 enlargedly.
Low-voltage coil 56 is connected to the load (not shown) electrically by the low-tension bushing 64 that is installed on the shell 60.Each low-tension bushing 64 all comprise pass shell 60 can conduction current lead.Each low-tension bushing 64 also comprises the porcelain ring that can isolate the slit between shell 60 and lead and can 60 and the lead fully.
Shell 60 is that the common ground connection that is used for transformer 50 connects.Magnetic core 52 is connected to shell 60 in single position.More particularly, magnetic core 52 is connected to shell 60 by the cable 82 of contact shell 60 outside surfaces.Cable 82 stretches out shell 80 by the magnetic core grounding sleeve 83 that is connected on shell 60 outside surfaces.Magnetic core grounding sleeve 83 comprises the magnet ring that can isolate the slit between shell 60 and cable 82 and can 60 and the cable 82 fully.Perhaps, cable 82 can directly be fixed on the inside surface of shell 60.
High-tension coil 54 is by the alternating voltage excitation from AC power.Alternating voltage produces magnetic flux in magnetic core 52.The number of turn of magnetic flux and high-tension coil 54 is proportional.Low-voltage coil 56 is passed in magnetic flux cutting, and produces low-voltage coil 56 in and the proportional voltage of the number of turn of low-voltage coil 56.
Transformer 50 comprises insulating material, so that mutual each hardware of isolating transformer 50 inside electrically.For example, transformer 50 comprises potential barrier 74a and the pad 72a between high and low pressure coil 54,56.Potential barrier 74a and pad 72a are formed by the solid insulating material such as cellulose pressing plate or paper, are used for isolated high-voltage coil 54 and low-voltage coil 56.
Transformer 50 also comprises potential barrier 74b and the pad 72b between low-voltage coil 56 and magnetic core stem stem 52a.Potential barrier 74b and pad 72b are used for isolating low-voltage coil 56 and magnetic core 52.Transformer 50 also comprises pad 72c, is used for isolating magnetic core 52 and shell 60.Transformer 50 also comprises potential barrier 74c, is used for isolating high and low pressure coil 54,56 and shell 60.
Insulative barriers and pad are also between other earth elements of transformer 10.
Be full of the iknsulating liquid such as mineral oil 76 in the shell 60 of transformer 50.Mineral oil 76 plays insulation and the heat eliminating medium in shell 60.Thereby for example, high and low pressure coil 54,56 and potential barrier 74a and pad 72a can isolate by mineral oil 76.
Each of high and low pressure coil 54,56 has their the built-in electrical insulation system that is formed by solid material such as cellulose pressing plate or paper and the iknsulating liquid such as mineral oil.
In Fig. 3, show the insulation system (the inside and outside structure that comprises insulation system) of power transformer 50 in the simplified schematic mode.
The detail that relates to method 10 is as follows.Method 10 is included in the appearance of identification abnormal conditions in the insulation system of power transformer 50 and the general location of abnormal conditions.These are to check (step 12 among Fig. 1,13 and 14) that each area of isolation is realized by the zone of dispersion of the insulation system in the insulating power supply transformer 50 with under one group of controlled condition.More particularly, each node in the insulation system can ground connection or load onto protective device so as in insulation system, to isolate node-to-node or node to the zone on ground, thereby can measure each the dielectric loss of these zones.For example, can give magnetic core 52 in the power transformer 50 or bushing 62 or low-tension bushing 64 dress protective devices so that each zone of isolated insulation system.As an object lesson, by give low-voltage coil 56 dress protective devices can isolated high-voltage coil 54 and ground between insulating regions.
Use and well known to a person skilled in the art usually in the design of power transformer insulation system that routine techniques can realize the inspection of each area of isolation of insulation system.For example, the definite power factor test of above-mentioned American National Standards Institute can be with conducting a survey.Power factor test can the alternating voltage of 10000v be implemented on area of isolation by for example being provided with on the node at the every end in zone place or terminal.In other words, voltage is put on for example high-tension coil 54 two ends of the lead of isolating by the insulation system area of isolation.Impressed voltage typically has the supply frequency frequency of 60hertz for example that is approximately equal to power transformer 50.Can measure the resulting capacitive current that flows through insulation system then, and the phase angle between impressed voltage and the electric current.
Can obtain the power factor of insulation system area of isolation by phase cosine of an angle between calculating voltage and the electric current, this power factor shows the dielectric loss (or " tan-δ ") there.With power factor and predetermined value comparison so that determine in this zone, whether there are abnormal conditions.For example, power factor illustrates greatly then that than 0.005 or 0.5% abnormal conditions are arranged.
Perhaps, by frequency domain dielectric spectroscopy, just, implement to be used for the inspection of abnormal conditions by being the dielectric loss that preset range is measured the insulation system area of isolation when being each value between about 0.01hertz and the 1000hertz at frequency configuration with impressed voltage.The resulting diagrammatic representation (typically being curve) of " dielectric loss is to the frequency of specific region " is in " dielectric response " hereinafter referred to as the zone.
Use well known to a person skilled in the art the routine techniques of power transformer insulation system design, and based on impressed voltage, measurement electric current, and the measurement phase angle between impressed voltage and the measurement electric current can quantize dielectric loss.The suitable device that is used to produce input voltage and measure resulting electric current and phase angle can be that no.IDA200 obtains from General Electric Co. Limited's model.The dielectric that obtains from measuring voltage, electric current and the phase angle that is used for the specific region responds " the measuring the dielectric response " that is called this zone below.
With the calculating dielectric response ratio of measuring dielectric response and insulation system respective regions so that determine whether there are abnormal conditions in this zone.Calculating the dielectric response is not exist the theory of the dielectric in the zone of abnormal conditions response to represent.Calculate material behavior and the geometric configuration (be included in the material behavior that zone in play any oil of insulating material effect) of dielectric response based on insulating material in the zone.Calculate the dielectric response also based on the temperature of insulating material when obtaining to measure dielectric and respond.
At the theoretical dielectric loss of each frequency computation part, on described each frequency, use the routine techniques that well known to a person skilled in the art the design of power transformer insulation system usually, measure dielectric loss based on above-mentioned factor.Calculate the curve of these values of dielectric response expression, as the function of frequency.
There are abnormal conditions in the big explanation of deviation ratio predetermined quantity of measuring the dielectric response and calculating between the dielectric response in the insulation system respective regions, thereby and provides the indication of display abnormality situation apparent position.
It should be noted that to be used for determining the appearance of abnormal conditions and the only purpose description of conduct demonstration of above-mentioned inspection of apparent position, the diagnostic test of other types also can be used for the place of these specific inspections.
After the appearance and apparent position of identification abnormal conditions, just, the type of (step 16) identification abnormal conditions after the zone of discerning insulation system with abnormal conditions.More particularly, produce the diagrammatic representation (typically being curve) (step 18) that shows the response of measurement dielectric and calculate deviation between the dielectric response.This diagrammatic representation is called respective regions " dielectric frequency response signature " or " DFR signature " below.
The calculating dielectric loss that deducts at the corresponding frequencies place by the measurement dielectric loss that is used in each sampling frequency place produces the DFR signature.Calculating dielectric loss with each frequency removes in the calculating at this frequency place and the difference between the measurement dielectric loss, multiply by 100 then.The total curve plotting of these values becomes the function representation DFR signature of frequency.In other words, the DFR signature is the standardization signature function, and this function is easy to change in the normal electrical dielectric loss frequency spectrum of insulation system.
Subsequently, DFR signature and other DFR signature are compared so that the type (step 20) of the abnormal conditions of determining to occur in test zone.The applicant has been found that the particular type of abnormal conditions is usually for having the DFR signature of unique or distinguished feature.Gather corresponding to " library " of each DFR signature of particular type abnormal conditions or DFR signature that database can obtain from the power transformer with known abnormal conditions or from laboratory examination.
The identification that comparison can be simplified the type of the abnormal conditions that occur in the zone from the DFR signature and the DFR signature in the database in the zone of the power transformer 50 with abnormal conditions.In other words, make the profile and the identification (step 22,24) that can simplify these abnormal conditions corresponding to the profile phase coupling of the reference DFR signature of known abnormal conditions of the DFR signature of test zone.On the contrary, if the profile of the DFR of test zone signature can not obtain with coupling with reference to the profile of DFR signature, the type (step 25) that then can not discern abnormal conditions (it should be noted that the DFR signature changes with the geometry of respective regions.Thereby, must be with reference to DFR signature corresponding to the geometric configuration of the specific region of estimated insulation system).
Above-mentioned steps can be repeated until the abnormal conditions (step 26) that check out the Zone Full of insulation system in the power transformer.
Usually, be used for power transformer for example other type diagnostic test of power transformer 50 can discern the appearance of abnormal conditions, but can not distinguish the particular type of abnormal conditions.Method 10 can be discerned the particular type of abnormal conditions, and especially can be under the situation of dismantling power transformer 50 not and do not drain under the insulation oil condition of power transformer 50 and carry out.Method 10 is especially favourable when power transformer 10 uses.More particularly, the identification of the particular type by simplifying abnormal conditions, method 10 can prevent the unnecessary dismounting and the dismounting of transformer 10 when abnormal conditions are the type of proofreading and correct on can be in position.Therefore, usually can avoid by using method 10 and remove power transformer or dismantling power transformer from operating position so that the effort that the diagnosing abnormal situation links together, cost and stop time.In addition, method 10 can utilize equipment easy acquisition, existing to carry out, and time, effort and technical ability that implementation method 10 needs are relatively low.
And method 10 can be discerned the routine diagnosis test abnormal conditions of meeting mistaken diagnosis usually.For example, transformer for example in the transformer 50 a kind of common accident of High Power Factor be excessive resistance in the magnetic core grounding circuit.This specific abnormal condition can by between magnetic core and the magnetic core earthing strip than the high resistance of normal resistance or by in the magnetic core between each layer the resistance higher than normal resistance cause.The test of routine diagnosis test case such as power factor can not be distinguished the humidity in the cellulose insulation material of excessive resistance in the magnetic core grounding circuit and power transformer usually.Therefore, the power transformer of showing High Power Factor owing to the excessive resistance in the magnetic core grounding circuit exists on the moist error message basis in the cellulose insulation material of transformer sometimes and stands unnecessary drying course.
On the contrary, method 10 can clearly be discerned resistance higher than normal resistance in the magnetic core grounding circuit of the transformer such as transformer 10.For example, Fig. 4 has described the DFR signature of determining with experimental technique of the magnetic core grounding circuit of a series of twin coil power transformer that are used to be similar to power transformer 50.Be connected to the earthing strip of power transformer by the resistor with different resistance, the resistance of magnetic core grounding circuit changes in numerical range.Measurement is used for the DFR signature of the respective regions of insulation system when the resistance of magnetic core grounding circuit is set to each numerical value shown in Fig. 4.
The resistance with low frequency input voltage place is identical in fact for the DFR signature that Fig. 4 shows at the different value place of magnetic core stake resistance.Yet the profile of DFR signature changes at high-frequency input voltage place in fact.More particularly, the DFR signature corresponding to each different value of resistance has unique profile at high-frequency input voltage place.Singularity corresponding to the DFR signature of each value of resistance can be used for discerning resistance higher than normal resistance in the magnetic core of transformer grounding circuit, is the resistance mistaken diagnosis higher than normal resistance the abnormal conditions relevant with insulating material unlikely.
And power factor test is carried out at a frequency place of input voltage, so himself abnormal conditions of the demonstration at the frequency place of power factor test beyond can not the diagnostic test frequency.On the contrary, DFR signature is to obtain on the scope of input voltage frequency, so the DFR signature can be discerned himself the abnormal conditions of demonstration at the frequency place beyond the single test frequency of power factor (PF) test.
Fig. 5 has described the actual DFR signature of diagnosing and proofreading and correct before the abnormal conditions and obtain afterwards in the main-transformer that is similar to power transformer 50.Detect the appearance of abnormal conditions at first based on High Power Factor reading (than 0.5% height).Subsequently, the inspection of main-transformer trace back to use in the load tap changer be connected to the auxiliary transformer of main-transformer electrically the time, DFR signs and corresponding to the comparison between the reference DFR signature of high magnetic core stake resistance, abnormal conditions are identified as resistance higher than normal resistance in the main-transformer magnetic core grounding circuit based on measuring.
Fig. 5 has described and has regulated auxiliary transformer so that before reducing high magnetic core stake resistance in the main-transformer and the DFR signature of the insulation system involved area of measuring afterwards.Fig. 5 show DFR signature before these abnormal conditions are proofreaied and correct, have with repair after the relevant unique profile of DFR signature (repair profile that DFR afterwards signs typically that without any the insulating regions of the geometry in particular of abnormal conditions).
Fig. 6 has described the first dielectric frequency response signature from the insulating regions of first transformer with magnetic core stake resistance higher than normal resistance.Fig. 6 has also described the second dielectric frequency response signature from the insulating regions of second transformer with normal magnetic core stake resistance.As shown in Figure 6, clearly, unique profile of the dielectric frequency response signature by involved area can be discerned the condition of this particular type.
Fig. 7 has described DFR signature that obtains from the insulating regions with relative higher level humidity and the 2nd DFR signature that obtains from the insulating regions with relatively low rank humidity.Fig. 8 has described the DFR signature that obtains from the insulating regions of showing chemical contamination.Unique profile of these DFR signature each all the particular type with the Abnormal Insulation situation is consistent in fact, therefore can be used for discerning this abnormal conditions in other zones of insulation system.
Stated many feature and advantage of the present invention although should understand at foregoing description, these disclosed contents only are illustrative, can make change to the present invention in the wide in range implication that appended claims limited in principle of the invention scope.
Claims (20)
1. a method is used for a kind of abnormal conditions of insulation system identification at power transformer, comprising:
In the area inner measuring dielectric loss of insulation system, wherein before described area inner measuring dielectric loss, isolate described zone electrically;
Theoretical dielectric loss based on the described zone of temperature computation in material behavior, geometric configuration and zone;
Produce the diagrammatic representation of the percentage difference between the measurements and calculations dielectric loss; With
Relatively the diagrammatic representation that is produced is with the predetermined reference diagrammatic representation of percentage difference between measurement and the theoretical dielectric loss, and each described predetermined reference diagrammatic representation is corresponding to specific abnormal conditions type.
2. the method for claim 1, wherein in the zone, measure dielectric loss and be included in execution dielectric frequency response test on the zone.
3. method as claimed in claim 2, wherein, be included in and carry out a plurality of power factors tests on the zone carrying out dielectric frequency response test on the zone, use the input voltage frequency that is different from the input voltage frequency that is used for other power factor test to implement each power factor test.
4. the diagrammatic representation that the method for claim 1, wherein produces the percentage difference between measurement and the theoretical dielectric loss comprises the dielectric response frequency signature that produces the zone.
5. method as claimed in claim 4, wherein, the dielectric response frequency signature that produces the zone comprises and calculates each a theoretical dielectric loss and a corresponding difference of measuring between the dielectric loss, and by calculating merchant between a described difference and the corresponding theoretical dielectric loss with described difference divided by a corresponding theoretical dielectric loss.
6. method as claimed in claim 5, wherein, the dielectric response frequency signature that produces the zone also comprises with 100 takes advantage of described merchant.
7. the method for claim 1, wherein also comprise the measurement of from database, reading in one or more known other insulating regions with particular type abnormal conditions and one or more diagrammatic representations of the percentage difference between the theoretical dielectric loss.
8. the method for claim 1, the shape of one of the measurement that the figured shape that also comprises the percentage difference between the coupling measurements and calculations dielectric loss and one or more known other insulating regions with particular type abnormal conditions are interior and one or more diagrammatic representations of the percentage difference between the theoretical dielectric loss.
9. the method for claim 1 also comprises by the theoretical dielectric loss of the measurement dielectric loss in the comparison domain with the zone, identified region when having abnormal conditions.
10. the method for claim 1, wherein, the diagrammatic representation that is relatively produced with measure and theoretical dielectric loss between the predetermined reference diagrammatic representation of percentage difference comprise determine figured shape whether and the measurement in one or more known other insulating regions with particular type abnormal conditions and the one or more figured shape of the percentage difference between the theoretical dielectric loss be different in essence.
11. the method for claim 1, wherein be included in theory of computation dielectric loss under the situation of any abnormal conditions influence in the consideration of regional not based on the theoretical dielectric loss in the temperature computation zone in material behavior, geometric configuration and zone.
12. a method is used for the type of the abnormal conditions in the transformer insulated zone of labeled power supply, comprising:
The lead that utilizes alternating voltage excitation insulating regions to isolate;
In preset range, change the frequency of the alternating voltage between a plurality of discrete frequencies;
Dielectric loss in each place's measurement insulating regions of discrete frequency wherein, was isolated described zone electrically before described area inner measuring dielectric loss;
The theoretical dielectric loss of calculating insulating regions at each place of discrete frequency;
The percentage difference of measuring between dielectric loss and the theoretical dielectric loss is calculated at each place in discrete frequency;
Each place in discrete frequency produces the essence curve representation of measuring dielectric loss and calculating the percentage difference between the dielectric loss; With
The essence curve representation that is relatively produced is represented with the measurement dielectric loss that is used for known insulating regions with particular type abnormal conditions and one or more predetermined curves of the percentage difference between the calculating dielectric loss.
13. method as claimed in claim 12 also is included in excitation wire and before other wire for power ground in this lead and the power transformer is isolated.
14. method as claimed in claim 12 also comprises by comparing and measuring at least one and the corresponding theoretical dielectric loss in the dielectric loss, identification insulating regions when having abnormal conditions.
15. method as claimed in claim 12, wherein, the frequency that changes the alternating voltage between a plurality of discrete frequencies in preset range is included in the frequency that changes alternating voltage between 0.01hertz and the 1000hertz.
16. method as claimed in claim 12 also comprises and reads the measurement dielectric loss that is used for known insulating regions with particular type abnormal conditions and the one or more predetermined curves that calculate the percentage difference between the dielectric loss represented from database.
17. method as claimed in claim 12 comprises that also coupling one of represents in the measurement dielectric loss at each place of discrete frequency and the essence curve representation that calculates the percentage difference between the dielectric loss and the measurement dielectric loss that is used for known insulating regions with particular type abnormal conditions and one or more predetermined curves of the percentage difference between the calculating dielectric loss.
18. method as claimed in claim 13 wherein, is included under the situation of considering any abnormal conditions in the insulating regions each place's theory of computation dielectric loss in discrete frequency in each place's theory of computation dielectric loss of discrete frequency.
19. a method is used for a kind of abnormal conditions of identification in the power transformer insulation system, comprising:
In the area inner measuring dielectric loss of insulation system, wherein, before described area inner measuring dielectric loss, isolate described zone electrically;
The theoretical dielectric loss of zoning;
When having abnormal conditions, the theoretical dielectric loss by measurement dielectric loss in the comparison domain and zone discerns described zone;
Produce the diagrammatic representation of the percentage difference between the measurements and calculations dielectric loss; With
Relatively the diagrammatic representation that is produced is with the predetermined reference diagrammatic representation of percentage difference between measurement and the theoretical dielectric loss, and each described predetermined reference diagrammatic representation is corresponding to specific abnormal conditions type.
20. a method comprises:
In power transformer, measure the dielectric frequency response of insulating regions, wherein, before described area inner measuring, isolate described zone electrically;
The theoretical dielectric frequency response of zoning;
When discerning described zone when dielectric response and the response of theoretical electrolyte have abnormal conditions by comparing and measuring;
Produce the dielectric frequency response signature in zone; With
Relatively dielectric frequency response signature is signed with known dielectric frequency response with other insulating regions of particular type abnormal conditions.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US36967102P | 2002-04-03 | 2002-04-03 | |
| US60/369,671 | 2002-04-03 | ||
| US10/310,103 | 2002-12-04 |
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| CN102007419B (en) * | 2008-04-14 | 2014-02-19 | Abb研究有限公司 | Determining degraded insulating ability in insulation provided between two objects of an inductively operating element |
| CN109100622A (en) * | 2018-07-11 | 2018-12-28 | 云南电网有限责任公司电力科学研究院 | Installation simulator for the experiment of converter transformer paper oil insulation high pressure characteristics |
| CN110568301A (en) * | 2019-09-16 | 2019-12-13 | 国网河北省电力有限公司电力科学研究院 | Detection mode prejudging method based on effective detection rate of transformer state quantity |
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| CN102998338B (en) * | 2012-11-20 | 2015-04-22 | 中国电力科学研究院 | Dielectric response characteristic-based insulation dampness diagnosis method for transformer oil paper |
| CN104678267A (en) * | 2015-02-11 | 2015-06-03 | 华南理工大学 | Method for indirectly measuring dielectric loss of insulation layer of cable |
| KR102558782B1 (en) * | 2016-05-04 | 2023-07-21 | 엘에스일렉트릭(주) | Apparatus for predicting power loss of transformer |
| RU2643940C1 (en) * | 2016-12-30 | 2018-02-06 | Общество с ограниченной ответственностью Научно-производственное объединение "Логотех" | Method of vibratory unavailable diagnosis of transformer |
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| CN109100622A (en) * | 2018-07-11 | 2018-12-28 | 云南电网有限责任公司电力科学研究院 | Installation simulator for the experiment of converter transformer paper oil insulation high pressure characteristics |
| CN110568301A (en) * | 2019-09-16 | 2019-12-13 | 国网河北省电力有限公司电力科学研究院 | Detection mode prejudging method based on effective detection rate of transformer state quantity |
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| CN1451970A (en) | 2003-10-29 |
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