CN109633392A - Transformer insulated test method and device - Google Patents
Transformer insulated test method and device Download PDFInfo
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- CN109633392A CN109633392A CN201811648941.0A CN201811648941A CN109633392A CN 109633392 A CN109633392 A CN 109633392A CN 201811648941 A CN201811648941 A CN 201811648941A CN 109633392 A CN109633392 A CN 109633392A
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Housings And Mounting Of Transformers (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a kind of transformer insulated test method and devices.Wherein, this method comprises: according to the maximum field intensity of the unit under test of the transformer under different test temperatures, temperature correction coefficient；Maximum temperature correction facotor is chosen from multiple temperature correction facotors as correction index；It is modified according to voltage of the correction index to transformer insulated test, and carries out Insulation test.The present invention solves the technical issues of transformer insulated test method in the related technology easily leads to test failure, not can correctly reflect the insulation performance of transformer.
Description
Technical field
The present invention relates to power domains, in particular to a kind of transformer insulated test method and device.
Background technique
In the related technology, transformer needs to carry out when leaving the factory test of correlation, and the insulation system of transformer is by transformer
Insulating materials composition, insulation system are the primary conditions that transformer is worked normally and run, and guarantee the safety and stability of transformer
Operation.Oil-Paper Insulation in Insulation test, at varying environment temperature and loading condiction, in inside transformer major insulation
Temperature change, the dielectric constant of transformer oil and cardboard and dielectric strength can be caused to change, so that transformer exists
Meet Insulation test requirement in the case of room temperature, be unsatisfactory for the requirement of Insulation test in the case of a high temperature, Insulation test is caused to fail,
The insulation performance of transformer is not can correctly reflect.
For above-mentioned problem, currently no effective solution has been proposed.
Summary of the invention
The embodiment of the invention provides a kind of transformer insulated test method and devices, at least to solve in the related technology
The technical issues of transformer insulated test method easily leads to test failure, not can correctly reflect the insulation performance of transformer.
According to an aspect of an embodiment of the present invention, a kind of transformer insulated test method is provided, comprising: according to difference
The maximum field intensity of the unit under test of transformer under test temperature, temperature correction coefficient；From multiple temperature correction systems
Maximum temperature correction facotor is chosen in number as correction index；It is exhausted to the transformer according to the correction index
The voltage of edge test is modified, and carries out Insulation test.
Optionally, according to the maximum field intensity of the unit under test of the transformer under different test temperatures, temperature school
Positive coefficient includes: the temperature occurred according to the unit under test of the transformer in actual motion and the unit under test
Temperature under normal temperature conditions determines the unit under test at normal temperature, the equivalent voltage applied；According to the equivalent electricity
The voltage applied in the case of pressure and room temperature, determines the maximum field intensity of the unit under test of the transformer under different test temperatures；
According to the maximum field intensity temperature correction coefficient, wherein the product of the correction coefficient and the voltage is described
Equivalent voltage.
Optionally, according to the voltage applied in the case of the equivalent voltage and room temperature, the change under different test temperatures is determined
The maximum field intensity of the unit under test of depressor includes: to determine the corresponding temperature of the equivalent voltage according to the equivalent voltage
Under, the first maximum field intensity of the unit under test；According to the voltage applied in the case of room temperature, the unit under test is determined
Second maximum field intensity；Wherein, according to the maximum field intensity temperature correction coefficient include: according to described first most
Big electric field strength and the second maximum field intensity ratio, determine the temperature correction facotor.
Optionally, the temperature that is occurred in actual motion according to the unit under test of the transformer and described tested
The temperature of component under normal temperature conditions, determines the unit under test at normal temperature, comprises determining that before the equivalent voltage applied
The insulation weak-point position of the unit under test, the insulation weak-point position are the electric field collection of the unit under test under corresponding temperature
Middle place；Determine the maximum field intensity of the insulation weak-point position with the first variation relation of temperature；According to first variation
Relationship executes the step of determining the first maximum field intensity and/or the second maximum field intensity.
Optionally, it is executed according to first variation relation and determines the first maximum field intensity and/or the second maximum
The step of electric field strength includes: the insulation weak-point position according to the unit under test, determines comparison position；Determine the relatively position
The maximum field intensity set with temperature the second variation relation；According to first variation relation and second variation relation,
Determine the first maximum field intensity and/or the second maximum field intensity.
Optionally, the insulation weak-point position for determining the unit under test includes: based on effective meta analysis to the transformer
The unit under test emulated, obtain simulation result；According to the simulation result, determine that the insulation of the unit under test is weak
Point position.
Optionally, it is emulated based on the unit under test of effective meta analysis to the transformer, obtains simulation result
It include: the simulation model for establishing the unit under test；Boundary condition is added to the simulation model, wherein the boundary condition
Including at least one following: field distribution, electric field strength, the current potential of different location；Attribute is added to the simulation model,
In, the attribute includes dielectric constant, resistance, voltage, electric current；It is emulated, obtains simulation result.
Optionally, it is emulated, show that simulation result includes: the different location for obtaining the unit under test by emulating
The electric-field intensity distribution situation of the different location of Potential distribution situation and the unit under test；According to the Potential distribution feelings
Condition and the electric-field intensity distribution situation determine field distribution curve of the unit under test on fixed route, wherein institute
Field distribution curve is stated for determining the insulation weak-point position.
According to another aspect of an embodiment of the present invention, a kind of transformer insulated test device is additionally provided, comprising: determine mould
Block, for the maximum field intensity according to the unit under test of the transformer under different test temperatures, temperature correction coefficient；Choosing
Modulus block, for choosing maximum temperature correction facotor from multiple temperature correction facotors as correction index；Test mould
Block for being modified according to voltage of the correction index to the transformer insulated test, and is tested.
According to another aspect of an embodiment of the present invention, a kind of storage medium is additionally provided, which is characterized in that the storage is situated between
Matter includes the program of storage, wherein equipment where controlling the storage medium in described program operation executes any among the above
Method described in one.
According to another aspect of an embodiment of the present invention, a kind of processor is additionally provided, which is characterized in that the processor is used
In operation program, wherein described program run when execute it is any one of above-mentioned described in method.
In embodiments of the present invention, the maximum field using the unit under test according to the transformer under different test temperatures is strong
Degree, temperature correction coefficient；Maximum temperature correction facotor is chosen from multiple temperature correction facotors as voltage correction system
Number；It is modified according to voltage of the correction index to transformer insulated test, and carries out the mode of Insulation test, by right
Test voltage is modified, and has achieved the purpose that correct test result, to realize the skill for carrying out validity test to transformer
Art effect, and then the transformer insulated test method solved in the related technology easily leads to test failure, not can correctly reflect change
The technical issues of insulation performance of depressor.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes part of this application, this hair
Bright illustrative embodiments and their description are used to explain the present invention, and are not constituted improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is a kind of flow chart of transformer insulated test method according to an embodiment of the present invention；
Fig. 2 is the schematic diagram of the temperature variation characteristic of the transformer oil relative dielectric constant of embodiment according to the present invention；
Fig. 3 is the schematic diagram of the temperature variation characteristic of the oil immersion cardboard relative dielectric constant of embodiment according to the present invention；
Fig. 4 is the schematic diagram of the double-deck oilpaper of embodiment according to the present invention；
Fig. 5 is the schematic diagram of the computation model of the double-deck oilpaper of embodiment according to the present invention；
Fig. 6 is the schematic diagram of electric Field Calculation model in the middle part of the middle pressure winding of the high pressure-of embodiment according to the present invention；
Fig. 7 is the signal of field distribution curve of the high pressure-Central Asia winding of embodiment according to the present invention on the path A-B
Figure；
Fig. 8 is the signal of field distribution curve of the high pressure-Central Asia winding of embodiment according to the present invention on the path C-D
Figure；
Fig. 9 is the signal of the temperature variation characteristic of the transformer oil clearance maximum field intensity of embodiment according to the present invention
Figure；
Figure 10 is the schematic diagram of the temperature correction facotor of embodiment according to the present invention；
Figure 11 is a kind of schematic diagram of transformer insulated test device according to an embodiment of the present invention.
Specific embodiment
In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction in the embodiment of the present invention
Attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only
The embodiment of a part of the invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
The model that the present invention protects all should belong in member's every other embodiment obtained without making creative work
It encloses.
It should be noted that description and claims of this specification and term " first " in above-mentioned attached drawing, "
Two " etc. be to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should be understood that using in this way
Data be interchangeable under appropriate circumstances, so as to the embodiment of the present invention described herein can in addition to illustrating herein or
Sequence other than those of description is implemented.In addition, term " includes " and " having " and their any deformation, it is intended that cover
Cover it is non-exclusive include, for example, the process, method, system, product or equipment for containing a series of steps or units are not necessarily limited to
Step or unit those of is clearly listed, but may include be not clearly listed or for these process, methods, product
Or other step or units that equipment is intrinsic.
According to embodiments of the present invention, a kind of embodiment of the method for transformer insulated test method is provided, needs to illustrate
It is that step shown in the flowchart of the accompanying drawings can execute in a computer system such as a set of computer executable instructions,
Also, although logical order is shown in flow charts, and it in some cases, can be to be different from sequence execution herein
Shown or described step.
Fig. 1 is a kind of flow chart of transformer insulated test method according to an embodiment of the present invention, as shown in Figure 1, the party
Method includes the following steps:
Step S102, according to the maximum field intensity of the unit under test of the transformer under different test temperatures, temperature
Correction coefficient；
Step S104 chooses maximum temperature correction facotor as correction index from multiple temperature correction facotors；
Step S106 is modified according to voltage of the correction index to transformer insulated test, and carries out insulation survey
Examination.
Through the above steps, using the maximum field intensity according to the unit under test of the transformer under different test temperatures,
Temperature correction coefficient；Maximum temperature correction facotor is chosen from multiple temperature correction facotors as correction index；
It is modified according to voltage of the correction index to transformer insulated test, and carries out the mode of Insulation test, by survey
Examination voltage is modified, and has achieved the purpose that correct test result, to realize the technology for carrying out validity test to transformer
Effect, and then the transformer insulated test method solved in the related technology easily leads to test failure, not can correctly reflect transformation
The technical issues of insulation performance of device.
Above-mentioned temperature correction facotor is that it is exhausted to will lead to inside transformer master since transformer is under different temperature conditions
Oil-Paper Insulation in edge, certain change occurs with temperature for the dielectric constant and dielectric strength of transformer oil and cardboard
Change.At low temperatures, maximum field intensity is lower than room temperature in Oil-Paper Insulation transformer oil, is conducive to improve paper oil insulation
The field distribution of system；In the case of a high temperature, maximum field intensity is greater than room temperature, transformer in Oil-Paper Insulation transformer oil
In actual motion, the temperature of internal Oil-Paper Insulation may be up to+80 DEG C, and the design of transformer and factory Insulation Test are equal
It carries out at normal temperature, if considering to apply identical voltage, maximum field intensity is greater than room temperature in transformer oil under high temperature, easily occurs
Transformer insulated nargin is met the requirements at normal temperature, and insulation margin is unsatisfactory for the case where requiring at high temperature, and then becomes
The phenomenon that examination of depressor delivery test cannot reflect the actual motion state of transformer.
Above-mentioned unit under test can be the insulation system of transformer, and above-mentioned insulation system includes transformer oil and oilpaper.
In the present embodiment, using voltage is changed, the correction to temperature is realized.For example, may by transformer actual motion
The actual temperature of appearance is acquired, which is scaled the transformer and is applied room temperature (for example, 20 DEG C) is lower
Equivalent voltage U1, in addition, the transformer temperature collection be room temperature in the case where, the voltage U2 which is applied, definition
Temperature correction facotor is K, and has U1=K U2.Above-mentioned temperature correction facotor is smaller, smaller to the amendment degree of voltage, in order to full
The amendment of all temperature of foot uses in the present embodiment in above-mentioned multiple temperature correction facotors maximum position for voltage correction system
Number, come correct different test temperatures under transformer voltage, to realize correction to temperature in test.
By applying the voltage after correction to transformer, the situation of the inaccuracy generated due to temperature is eliminated, is effectively improved
The validity and accuracy of test.
Optionally, according to the maximum field intensity of the unit under test of the transformer under different test temperatures, temperature school
Positive coefficient include: the temperature occurred in actual motion according to the unit under test of transformer and unit under test under normal temperature conditions
Temperature, determine unit under test at normal temperature, the equivalent voltage applied；According to what is applied in the case of equivalent voltage and room temperature
Voltage determines the maximum field intensity of the unit under test of the transformer under different test temperatures；It is determined according to maximum field intensity
Temperature correction facotor, wherein correction coefficient and the product of voltage are equivalent voltage.
In temperature correction coefficient, since voltage is amendment object, by other parameter come temperature school
Positive coefficient determines correction index according to temperature correction facotor, to be modified to voltage.In the present embodiment, using most
Big electric field strength determines above-mentioned temperature correction facotor, and insulation system maximum field intensity is E1, paper oil insulation system when arbitrary temp
System maximum field intensity is E2, then has: K=E2/E1.It that is to say, the above-mentioned unit under test according to transformer is in actual motion
The temperature of the temperature and unit under test of appearance under normal temperature conditions, determines unit under test at normal temperature, the equivalent electricity applied
Pressure；According to the voltage applied in the case of equivalent voltage and room temperature, the unit under test of the transformer under different test temperatures is determined
Maximum field intensity；According to maximum field intensity temperature correction coefficient, wherein correction coefficient and the product of voltage are equivalent
Voltage.
The voltage applied in the case of according to equivalent voltage and room temperature determines the quilt of the transformer under different test temperatures
It when surveying the maximum field intensity of component, can be determined at the corresponding temperature of equivalent voltage according to equivalent voltage, the of unit under test
One maximum field intensity；According to the voltage applied in the case of room temperature, the second maximum field intensity of unit under test is determined；Wherein,
According to maximum field intensity temperature correction coefficient include: according to the first maximum field intensity and the second maximum field intensity it
Than temperature correction coefficient.
Optionally, the temperature and unit under test occurred according to the unit under test of transformer in actual motion is in room temperature feelings
Temperature under condition determines unit under test at normal temperature, comprises determining that the insulation of unit under test is weak before the equivalent voltage applied
Point position, insulation weak-point position are under corresponding temperature, at the electric field concentration of unit under test；Determine the maximum electricity of insulation weak-point position
Field intensity with temperature the first variation relation；It is executed according to the first variation relation and determines the first maximum field intensity and/or second
The step of maximum field intensity.
Above-mentioned insulation weak-point position can be the position at electric field concentration, can also be the maximum position of electric field strength.It should
The temperature change of position is the most obvious, therefore uses the position, is analyzed and is handled, meets the position in temperature correction facotor
Situation of change when, necessarily satisfying for the situation of change of other positions.In the present embodiment, it is analyzed using insulation weak-point position
And processing.It can be by determining the maximum field intensity of insulation weak-point position with the first variation relation of temperature；In subsequent determination
When the case where the first maximum field intensity and/or the second maximum field intensity, the first maximum electricity is determined according to the first variation relation
Field intensity and/or the second maximum field intensity.
Optionally, it is executed according to the first variation relation and determines the first maximum field intensity and/or the second maximum field intensity
The step of include: insulation weak-point position according to unit under test, determine comparison position；Determine the maximum field intensity of comparison position
With the second variation relation of temperature；According to the first variation relation and the second variation relation, determine the first maximum field intensity and/or
Second maximum field intensity.
For above-mentioned insulation weak-point position, the present embodiment additionally provides the position compared with weakness position of becoming attached to generates comparison
It sets, by comparing the analysis and processing of position, keeps correction result more acurrate reliable and stablize.And by comparing the maximum electricity of position
Field intensity with temperature the second variation relation, in subsequent determination the first maximum field intensity and/or the second maximum field intensity
When situation, determine that the first maximum field intensity and/or the second maximum field are strong in conjunction with the first variation relation and the second variation relation
Degree.
Optionally, the insulation weak-point position for determining unit under test includes: the tested portion based on effective meta analysis to transformer
Part is emulated, and obtains simulation result；According to simulation result, the insulation weak-point position of unit under test is determined.
The intrinsic normal place of the insulation system that above-mentioned insulation weak-point position can be transformer, can also by calculate or
Person emulates determining above-mentioned insulation weak-point position.In the present embodiment, above-mentioned insulation weak-point position is determined by the way of emulation, letter
Folk prescription just, can be determined quickly.
Optionally, it is emulated based on unit under test of effective meta analysis to transformer, show that simulation result includes: to establish
The simulation model of unit under test；Boundary condition is added to simulation model, wherein boundary condition includes at least one following: electric field
Distribution, electric field strength, the current potential of different location；Attribute is added to simulation model, wherein attribute includes dielectric constant, resistance, electricity
Pressure, electric current；It is emulated, obtains simulation result.
In the present embodiment, field distribution can be the major insulation electricity under the test of 1min industrial frequency withstand voltage as defined in mock standard
Field distribution, it is 395kV that current potential, which can be high-voltage winding inlet wire First Line cake current potential, and voltage's distribiuting can be the ladder of the voltage between line cake
Degree is linear distribution；Current potential can also be that middle pressure winding current potential is 0；Since model is the interception middle pressure winding middle section of high pressure-,
And the electric field distribution characteristic of major insulation between the middle pressure winding of high pressure-is mainly studied, boundary face is the second class of electric field to model up and down
Homogeneous boundary condition.
Above-mentioned boundary condition refer to the variable solved on the boundary of domain or its it is reciprocal at any time with place
Changing rule.Include mainly First Boundary Condition, provides unknown function in borderline numerical value；Second kind boundary condition is given
Directional derivative of the unknown function in boundary exterior normal out；Third boundary condition provides unknown function in borderline functional value
With the linear combination of the directional derivative of exterior normal.For comsol software, only First Boundary Condition and the second class perimeter strip
Part.
Optionally, it is emulated, show that simulation result includes: the current potential by emulating the different location for obtaining unit under test
The electric-field intensity distribution situation of the different location of distribution situation and unit under test；According to Potential distribution situation and electric field strength
Distribution situation determines field distribution curve of the unit under test on fixed route, wherein field distribution curve is for determining insulation
Weakness position.
It should be noted that the present embodiment additionally provides a kind of optional embodiment, the embodiment is carried out below
To detailed description.
Power transformer be in power transmission and distribution energy conversion and transmission core, be in power transmission and transforming equipment it is mostly important, crucial,
Expensive equipment, reliability of operation are directly related to the economical operation and safety and stability of power grid.Power transformer is carried out
Real-time Condition assessment of insulation, fault diagnosis, failure predication are that running state of transformer evaluation studies are carried out outside Now Domestic
Hot spot, wherein being especially evaluated as main direction of studying in an insulated state.
Regulation according to GB/T 1094.3 about electric power transformer insulated test, 220kV oil-immersed power transformer need to be into
Row is outer to apply power frequency withstanding voltage test, but test generally carries out under the conditions of delivery test, and test ambient temperature is (20 DEG C of room temperature
~30 DEG C), and transformer is in non-operating state, inside transformer uniformity of temperature profile, identical or close as environment temperature at this time
Seemingly.
At varying environment temperature and loading condiction, the temperature change of the Oil-Paper Insulation in inside transformer major insulation
Range is -20 DEG C~+80 DEG C, and certain variation occurs with temperature for the dielectric constant and dielectric strength of transformer oil and cardboard.
When low temperature (temperature is lower than 20 DEG C), maximum field intensity is lower than room temperature in Oil-Paper Insulation transformer oil, is conducive to improve oil
The field distribution of paper insulation system；Under high temperature (temperature is higher than 20 DEG C), maximum field intensity in Oil-Paper Insulation transformer oil
Greater than room temperature, transformer is in actual motion, and up to+80 DEG C of the temperature of internal Oil-Paper Insulation, and the design of transformer
It is carried out at normal temperature with factory Insulation Test, if considering to apply identical voltage, maximum field is strong in transformer oil under high temperature
Degree is greater than room temperature, and easily transformer insulated nargin is met the requirements at normal temperature for appearance, and insulation margin is unsatisfactory for requiring at high temperature
The case where, and then there is the phenomenon that Transformer Plant Test examination cannot reflect the actual motion state of transformer, therefore, it need to examine
The insulation margin design and factory insulation for considering major insulation when transformer inside in actual moving process is in the condition of high temperature try
The equivalence tested, and then the Insulation Test that designs the insulation margin of transformer and dispatch from the factory is corrected accordingly.
The difference of present embodiment main contrast's actual motion temperature and factory environment temperature, determines under practical operation situation
With the variation of the transformer insulated characteristic in the case of factory, and revise one's view to the proposition of existing test parameters or method.Specifically
, present embodiment has studied temperature and becomes to 220kV by establishing the simulation model of the virtual electrode structure of transformer major insulation
The influence of depressor Oil-Paper Insulation electric field distribution characteristic.220kV transformer major insulation is obtained under industrial frequency withstand voltage test voltage
Electric field concentration at at the first oil clearance of middle pressure winding outer surface and high-voltage winding inner surface the first oil clearance line cake fillet.It depicts
The first oil clearance of middle pressure winding outer surface and high-voltage winding inner surface the first oil clearance maximum field intensity-temperature variation characteristic curve,
Basic data can be provided for the Insulation Test modification method of 220kV power transformer.
The detailed process of present embodiment is as follows:
1, influence of the temperature to Oil-Paper Insulation electric parameter；
Influence of the temperature to Oil-Paper Insulation relative dielectric constant is measured, measurement is obtained to be handled to obtain through standard procedure
220kV transformer fresh oil and oil immersion cardboard -20 DEG C~+80 DEG C temperature ranges of temperature relative dielectric constant and volume resistance
Rate.
Fig. 2 is the schematic diagram of the temperature variation characteristic of the transformer oil relative dielectric constant of embodiment according to the present invention,
Fig. 3 is the schematic diagram of the temperature variation characteristic of the oil immersion cardboard relative dielectric constant of embodiment according to the present invention, such as Fig. 2 and figure
Shown in 3, test result shows: for transformer oil, line is almost presented with the raising of temperature in the relative dielectric constant of transformer oil
Property downward trend；For oil immersion cardboard, the relative dielectric constant of oil immersion cardboard is almost presented linear rise with the raising of temperature and becomes
Gesture.Due to the relative dielectric constant of transformer oil and oil immersion cardboard with temperature approximation it is in a linear relationship, can be quasi- by curve
Conjunction obtains the relative dielectric constant data of transformer oil and oil immersion cardboard under more wide temperature range.
Influence of the temperature to 220kV transformer field distribution, paper oil insulation are the primary insulation structure of inside transformer,
In transformer major insulation, the insulation between winding generally uses oil-paper barrier composite insulation structure.Fig. 4 is to implement according to the present invention
The schematic diagram of the double-deck oilpaper of mode, Fig. 5 are the schematic diagrames of the computation model of the double-deck oilpaper of embodiment according to the present invention, such as
Shown in Fig. 4 and Fig. 5, oil-paper combined insulation system of transformer is transformer oil and two kinds of impregnated paper dielectric parallel combinations.
Applied voltage is U, and interelectrode distance d, oily dielectric constant is ε1, conductivity γ1, with a thickness of d1；The dielectric constant of paper is
ε2, conductivity γ2, with a thickness of d2。
For 220kV power transformer, major insulation is primarily subjected to lightning impulse overvoltage, switching impulse overvoltage, just
Often power-frequency voltage when work, is alternating voltage.Under alternating voltage effect, the oily electric field strength with paper and its dielectric are normal
Number is inversely proportional.At different temperatures, transformer oil is different with the dielectric constant of impregnated paper, the field strength point inside Oil-Paper Insulation
Cloth will change, this will have an impact the Insulation Coordination of Oil-Paper Insulation.
2, numerical Analysis；
Classical check of transformer major insulation (i.e. oil-paper combination insulation) is tested according to its 1min industrial frequency withstand voltage to determine
, 1min industrial frequency experiment voltage, it is a kind of equal threshold voltages of switching overvoltage or wave chopping impact test voltage, since power frequency is resistance to
Pressure test is relatively simple, conveniently, and in the factory routine test of transformer, the equivalence usually using industrial frequency withstand voltage test is alternative,
Impulse voltage test is replaced using industrial frequency withstand voltage test, i.e., is converted switching overvoltage or wave chopping impact test voltage for power frequency examination
Electrical verification pressure carries out pressure test.
Simulation Calculation is established in simulation software, the numerical computation method analog transformer based on finite element analysis
The electrode structure and different dielectrics of internal various complexity, relative to other two kinds of calculation methods have computational accuracy height with
The advantages that applied widely, is widely used in the engineering practice of electric Field Calculation.
The three-phase three winding oil immersed type of model SFSZ-180000/220 is established following with numerical analysis software comsol
Major insulation electric Field Calculation model in the middle part of the middle pressure winding of power transformer high pressure-, chooses the transformer phase winding, establishes comprising height
Press the two-dimentional axis pair of oil-paper combination insulation structure between oil duct, the middle pressure winding of high pressure-between winding wire cake, middle pressure winding wire cake, line cake
Claim model.Fig. 6 is the schematic diagram of electric Field Calculation model in the middle part of the middle pressure winding of the high pressure-of embodiment according to the present invention, emulates mould
Type is as shown in Figure 6.A, B point are located at middle pressure, at high-voltage winding line cake fillet in figure, and line segment AB is radial at line cake fillet
Line segment；C is located in the middle part of middle pressure winding wire cake outer surface, and D point is located at high-voltage winding line cake inner surface near middle, line segment CD
For the radial line segment in the middle part of line cake.
Wherein, the partial parameters of model and boundary condition are provided that 1min industrial frequency withstand voltage as defined in mock standard is tested
Under major insulation field distribution, high-voltage winding inlet wire First Line cake current potential is 395kV, and the voltage gradient between line cake is linear point
Cloth；Middle pressure winding current potential is 0；Due to model be interception the middle pressure winding middle section of high pressure-, and mainly research high pressure-it is middle press around
The electric field distribution characteristic of major insulation between group, boundary face is electric field the second type boundary condition to model up and down.
According to simulation software it can be concluded that field distribution simulation result, under room temperature (20 DEG C), oil immersion cardboard and change
The relative dielectric constant of depressor oil is respectively εz=5.2, εy=2.11, major insulation Potential distribution, equipotential between the middle pressure winding of high pressure-
The calculated result of line distribution and electric-field intensity distribution can be embodied by color cloud picture, pattern of equipotentials or statistical graph.
It chooses two and therefrom presses winding outer surface to the path of high-voltage winding inner surface, is i.e. line segment AB and line segment CD, Fig. 7 in Fig. 6 are
The schematic diagram of field distribution curve of the high pressure of the embodiment-Central Asia winding on the path A-B according to the present invention, Fig. 8 is basis
The schematic diagram of field distribution curve of the high pressure of the embodiment of the present invention-Central Asia winding on the path C-D, such as Fig. 7 and Fig. 8 institute
Show, for according to the calculating knot of major insulation Potential distribution, equipotential lines distribution and electric-field intensity distribution between the middle pressure winding of above-mentioned high pressure-
Fruit, the radial field distribution situation on path AB and path CD determined.
The temperature characterisitic of paper oil insulation maximum field intensity under 1min industrial frequency experiment voltage is simulated by simulation calculation and is marked
220kV transformer major insulation field distribution under the test of 1min industrial frequency withstand voltage as defined in standard, high-voltage winding inlet wire First Line cake electricity
Position is 395kV, and the voltage gradient between line cake is linear distribution, and middle pressure, low pressure winding current potential are zero.It obtains under different temperatures,
220kV transformer Oil-Paper Insulation maximum field strength temperature variation characteristic.Simulation calculation is directed to model SFSZ-
180000/220 three-phase three winding oil-immersed power transformer.
In the middle part of three-phase three winding oil-immersed power transformer high pressure-middle pressure winding of model SFSZ-180000/220
Field distribution of the major insulation under 1min industrial frequency experiment voltage has carried out simulation calculation, and at electric field concentration and insulation weak-point is in middle pressure
At the first oil clearance of winding outer surface and high-voltage winding inner surface the first oil clearance line cake fillet.The first oil clearance of middle pressure winding outer surface is most
Big electric field strength and high-voltage winding inner surface the first oil clearance maximum field strength temperature variation characteristic calculated result are as shown in table 1.
1 SFSZ-180000/220 transformer maximum field strength Calculation Result of table
Fig. 9 is the signal of the temperature variation characteristic of the transformer oil clearance maximum field intensity of embodiment according to the present invention
Figure, as shown in figure 9, obtaining the statistical graph of calculated result for the result table according to shown in table 1.
The result shows that: as the temperature rises, middle pressure winding outer surface the first oil clearance maximum field intensity and high-voltage winding
Inner surface the first oil clearance maximum field intensity almost linearly rises, and the two is closer to.The high pressure-when temperature is lower than+30 DEG C
Maximum field intensity between middle pressure winding in oil-paper combination insulation system appears in the first oil clearance of middle pressure winding outer surface, in temperature
Maximum field intensity when degree is higher than+30 DEG C between the middle pressure winding of high pressure-in oil-paper combination insulation system appears in high-voltage winding
In the first oil clearance of surface.
Under high temperature, maximum field intensity is greater than room temperature in 220kV transformer major insulation transformer oil, and transformer need to be considered in reality
The insulation margin design and factory industrial frequency withstand voltage of major insulation when inside is in the condition of high temperature in the operational process of border are tested equivalent
Property, respectively and respectively due to the electric field strength allowable of middle pressure the first oil clearance of winding outer surface and the first oil clearance of high-voltage winding inner surface
Gallery space size and corresponding winding turn insulation thickness it is related, the insulation margin of the two need to be analyzed.
3, the transformer insulated test modification method of 220kV；
Although 1min power frequency is a kind of equal threshold voltages by switching overvoltage or wave chopping impact test voltage, generally can only
For the major insulation intensity of cock transformer, strictly speaking, check of the transformer major insulation under impact test voltage, electric field
Distribution should be carried out according to the method for Calculation of Transient Electric Field, this is because under the action of impulse overvoltage wave, transformer winding
Inside will generate complicated electromagnetic transient, i.e., so-called wave process.During wave, between the turn-to-turn of winding, Duan Jian, cake with
And winding will generate between component vibrate overvoltage over the ground, causes the Potential distribution at each position of winding uneven, generates biggish
Electric potential gradient, the longitudinal electric field between winding wire cake is larger at this time, will produce bigger effect to the field distribution of major insulation.
It determines the modification method of 1min industrial frequency withstand voltage test, considers the variation of test area surroundings temperature and load, the ground
Area's 220kV power transformer is in actual moving process, the range of temperature of the Oil-Paper Insulation in internal major insulation
It is -20 DEG C~+80 DEG C, certain variation occurs for the dielectric constant with temperature of transformer oil and cardboard, causes its maximum field strong
Degree changes.With in Fig. 8 under 1min industrial frequency experiment voltage middle pressure winding outer surface the first oil clearance maximum field intensity and height
It is constant in applied voltage for pressing the first oil clearance of winding inner surface maximum field strength temperature variation characteristic simulation result
In the case of, on the basis of room temperature (20 DEG C), temperature reduces then maximum field intensity and reduces, and temperature increases then maximum field intensity and increases
Greatly, i.e., under alternating voltage effect, the insulation margin and electrical strength of oil-paper combination insulation system decline with the raising of temperature.
Under high temperature (temperature is higher than 20 DEG C), maximum field intensity is greater than room temperature, transformation in Oil-Paper Insulation transformer oil
Device is in actual motion, and up to+80 DEG C of the temperature of internal Oil-Paper Insulation, and the design of transformer and factory Insulation Test
It carries out at normal temperature, if considering to apply identical voltage, maximum field intensity is greater than room temperature in transformer oil under high temperature, easily goes out
Now transformer insulated nargin is met the requirements at normal temperature, and insulation margin is unsatisfactory for the case where requiring at high temperature, and then occurs
The phenomenon that Transformer Plant Test examination cannot reflect the actual motion state of transformer, therefore, transformer need to be considered in reality
The equivalence of insulation margin design and the Insulation Test of dispatching from the factory of major insulation when inside is in the condition of high temperature in operational process, in turn
The insulation margin design and factory Insulation Test of transformer are corrected accordingly.
In view of test temperature when changing factory is more difficult, to the voltage applied in the ac voltage withstanding test of transformer
Carry out temperature correction.Temperature correction calculation method is as follows:
The temperature being likely to occur inside considering 220kV oil-immersed power transformer in actual motion is Tx, it is converted to often
The equivalent AC test withstanding voltage that should apply when warm (20 DEG C) is Ux, U0When for inside transformer temperature being room temperature (20 DEG C)
The ac test withstanding voltage that should apply, definition K is temperature correction facotor, and is had: Ux=KU0；
In U0Under effect, Oil-Paper Insulation maximum field intensity is E when room temperature (20 DEG C)0, paper oil insulation when arbitrary temp
System maximum field intensity is Ex, then have: K=Ex/E0；
When taking transformer actual motion, in Oil-Paper Insulation range of temperature, the maximum K value being calculated is as most
Whole 1min industrial frequency experiment correction index.
The correction coefficient for calculating 1min industrial frequency withstand voltage test voltage, for the three-phase three of model SFSZ-180000/220
Winding oil immersion power transformer, with the first oil clearance of middle pressure winding outer surface in table 1 under the effect of 1min industrial frequency experiment voltage
Maximum field intensity and high-voltage winding inner surface the first oil clearance maximum field strength temperature variation characteristic simulation result be according to
According to obtaining according to middle pressure winding outer surface the first oil clearance maximum field intensity and high-voltage winding inner surface the first oil clearance maximum field
The temperature correction facotor K calculated result that intensity carries out industrial frequency withstand voltage test is as shown in table 2.
2 SFSZ-180000/220 transformer temperature correction coefficient of table
Figure 10 is the schematic diagram of the temperature correction facotor of embodiment according to the present invention, as shown in Figure 10, for according to 2 institute of table
The result table shown obtains the statistical graph of calculated result.
The result shows that: respectively according to middle pressure winding outer surface the first oil clearance maximum field intensity and high-voltage winding inner surface
The temperature correction facotor that temperature variation characteristic of the one oil clearance maximum field intensity under same applied voltage is calculated is with temperature
The raising of degree and it is almost linear increase, but the temperature correction facotor of the two is in different temperature points difference, real transformer 1min
The temperature correction facotor K of industrial frequency withstand voltage test may be selected the larger value in the two and carry out voltage check.
Transformer is considered under actual motion condition, and internal temperature may be up to 80 DEG C, then factory pressure resistance at normal temperature
In test, the test voltage of 1min power frequency electric pressure test need to improve 3.6%, consider to calculate error, it is proposed that by 1min power frequency electric
The test voltage of pressure test improves 4%, could accurately examine major insulation intensity of the transformer under different running temperatures.
Present embodiment technical solution bring beneficial effect, present embodiment are directed to 220kV oil-immersed power transformer
1min industrial frequency withstand voltage test carry out test method temperature adjustmemt.It is proposed the suggestion of transformer O&M, and it is further proposed that factory
Or when handover 220kV transformer correlation dielectric test modification method, ensure the operation stability of power transformer and defeated
The stable operation of electric line escorts for building cleaning, efficient, safe and stable energy internet.Present embodiment principle
Operation is simple.
The key problem in technology point of present embodiment and to be intended to protect be a little the transformer insulated test amendment side based on industrial frequency experiment
The mentality of designing of method.The algorithm of transformer insulated test modification method based on industrial frequency experiment.
Figure 11 is a kind of schematic diagram of transformer insulated test device according to an embodiment of the present invention, as shown in figure 11, root
According to the another aspect of the embodiment of the present invention, a kind of transformer insulated test device is additionally provided, comprising: determining module 1102, choosing
Modulus block 1104 and test module 1106, are below described in detail the device.
Determining module 1102, for the maximum field intensity according to the unit under test of the transformer under different test temperatures,
Temperature correction coefficient；Module 1104 is chosen, is connected with above-mentioned determining module 1102, for from multiple temperature correction facotors
Maximum temperature correction facotor is chosen as correction index；Test module 1106 is connected with above-mentioned selection module 1104, uses
It is modified, and is tested according to voltage of the correction index to transformer insulated test.
By above-mentioned apparatus, determining module 1102 using according to the unit under test of the transformer under different test temperatures most
Big electric field strength, temperature correction coefficient；It chooses module 1104 and chooses maximum temperature school from multiple temperature correction facotors
Positive coefficient is as correction index；Test module 1106 is carried out according to voltage of the correction index to transformer insulated test
Amendment, and carries out the mode of Insulation test, by being modified test voltage, has achieved the purpose that correct test result, from
And the technical effect that validity test is carried out to transformer is realized, and then solve transformer insulated test side in the related technology
The technical issues of method easily leads to test failure, not can correctly reflect the insulation performance of transformer.
According to another aspect of an embodiment of the present invention, a kind of storage medium is additionally provided, which is characterized in that storage medium packet
Include the program of storage, wherein equipment where control storage medium executes any one of above-mentioned method in program operation.
According to another aspect of an embodiment of the present invention, a kind of processor is additionally provided, which is characterized in that processor is for transporting
Line program, wherein program executes any one of above-mentioned method when running.
The serial number of the above embodiments of the invention is only for description, does not represent the advantages or disadvantages of the embodiments.
In the above embodiment of the invention, it all emphasizes particularly on different fields to the description of each embodiment, does not have in some embodiment
The part of detailed description, reference can be made to the related descriptions of other embodiments.
In several embodiments provided herein, it should be understood that disclosed technology contents can pass through others
Mode is realized.Wherein, the apparatus embodiments described above are merely exemplary, such as the division of the unit, Ke Yiwei
A kind of logical function partition, there may be another division manner in actual implementation, for example, multiple units or components can combine or
Person is desirably integrated into another system, or some features can be ignored or not executed.Another point, shown or discussed is mutual
Between coupling, direct-coupling or communication connection can be through some interfaces, the INDIRECT COUPLING or communication link of unit or module
It connects, can be electrical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
On unit.It can some or all of the units may be selected to achieve the purpose of the solution of this embodiment according to the actual needs.
It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.Above-mentioned integrated list
Member both can take the form of hardware realization, can also realize in the form of software functional units.
If the integrated unit is realized in the form of SFU software functional unit and sells or use as independent product
When, it can store in a computer readable storage medium.Based on this understanding, technical solution of the present invention is substantially
The all or part of the part that contributes to existing technology or the technical solution can be in the form of software products in other words
It embodies, which is stored in a storage medium, including some instructions are used so that a computer
Equipment (can for personal computer, server or network equipment etc.) execute each embodiment the method for the present invention whole or
Part steps.And storage medium above-mentioned includes: that USB flash disk, read-only memory (ROM, Read-Only Memory), arbitrary access are deposited
Reservoir (RAM, Random Access Memory), mobile hard disk, magnetic or disk etc. be various to can store program code
Medium.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (11)
1. a kind of transformer insulated test method characterized by comprising
According to the maximum field intensity of the unit under test of the transformer under different test temperatures, temperature correction coefficient；
Maximum temperature correction facotor is chosen from multiple temperature correction facotors as correction index；
It is modified according to voltage of the correction index to the transformer insulated test, and carries out Insulation test.
2. the method according to claim 1, wherein according to the unit under test of the transformer under different test temperatures
Maximum field intensity, temperature correction coefficient includes:
The temperature occurred according to the unit under test of the transformer in actual motion and the unit under test are in room temperature feelings
Temperature under condition determines the unit under test at normal temperature, the equivalent voltage applied；
According to the voltage applied in the case of the equivalent voltage and room temperature, the tested of the transformer under different test temperatures is determined
The maximum field intensity of component；
According to the maximum field intensity temperature correction coefficient, wherein the correction coefficient and the product of the voltage are
The equivalent voltage.
3. according to the method described in claim 2, it is characterized in that, according to applying in the case of the equivalent voltage and room temperature
Voltage determines that the maximum field intensity of the unit under test of the transformer under different test temperatures includes:
It according to the equivalent voltage, determines at the corresponding temperature of the equivalent voltage, the first maximum field of the unit under test
Intensity；
According to the voltage applied in the case of room temperature, the second maximum field intensity of the unit under test is determined；
Wherein, include: according to the maximum field intensity temperature correction coefficient
According to the first maximum field intensity and the second maximum field intensity ratio, the temperature correction facotor is determined.
4. according to the method described in claim 3, it is characterized in that, according to the unit under test of the transformer in practical fortune
The temperature of the temperature and the unit under test occurred when row under normal temperature conditions, determines the unit under test at normal temperature, is applied
Include: before the equivalent voltage added
Determine that the insulation weak-point position of the unit under test, the insulation weak-point position are the unit under test under corresponding temperature
Electric field concentration at；
Determine the maximum field intensity of the insulation weak-point position with the first variation relation of temperature；
The step for determining the first maximum field intensity and/or the second maximum field intensity is executed according to first variation relation
Suddenly.
5. according to the method described in claim 4, determining described first it is characterized in that, executing according to first variation relation
The step of maximum field intensity and/or the second maximum field intensity includes:
According to the insulation weak-point position of the unit under test, comparison position is determined；
Determine the maximum field intensity of the comparison position with the second variation relation of temperature；
According to first variation relation and second variation relation, the first maximum field intensity and/or second are determined
Maximum field intensity.
6. according to the method described in claim 4, it is characterized in that, determining that the insulation weak-point position of the unit under test includes:
It is emulated based on the unit under test of effective meta analysis to the transformer, obtains simulation result；
According to the simulation result, the insulation weak-point position of the unit under test is determined.
7. according to the method described in claim 6, it is characterized in that, based on effective meta analysis to the described tested of the transformer
Component is emulated, and show that simulation result includes:
Establish the simulation model of the unit under test；
Boundary condition is added to the simulation model, wherein the boundary condition includes at least one following: field distribution, electricity
Field intensity, the current potential of different location；
Attribute is added to the simulation model, wherein the attribute includes dielectric constant, resistance, voltage, electric current；
It is emulated, obtains simulation result.
8. showing that simulation result includes: the method according to the description of claim 7 is characterized in that being emulated
Potential distribution situation and the different positions of the unit under test of the different location of the unit under test are obtained by emulating
The electric-field intensity distribution situation set；
According to the Potential distribution situation and the electric-field intensity distribution situation, determine the unit under test on fixed route
Field distribution curve, wherein the field distribution curve is for determining the insulation weak-point position.
9. a kind of transformer insulated test device characterized by comprising
Determining module, for the maximum field intensity according to the unit under test of the transformer under different test temperatures, temperature
Correction coefficient；
Module is chosen, for choosing maximum temperature correction facotor from multiple temperature correction facotors as correction index；
Test module is gone forward side by side for being modified according to voltage of the correction index to the transformer insulated test
Row test.
10. a kind of storage medium, which is characterized in that the storage medium includes the program of storage, wherein run in described program
When control the storage medium where equipment perform claim require any one of 1 to 8 described in method.
11. a kind of processor, which is characterized in that the processor is for running program, wherein right of execution when described program is run
Benefit require any one of 1 to 8 described in method.
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