CN116593879A - Method for detecting assembly precision of finished product of on-load tap-changer - Google Patents
Method for detecting assembly precision of finished product of on-load tap-changer Download PDFInfo
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- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
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Abstract
The application discloses a method for detecting the assembly precision of a finished product of an on-load tap-changer, which comprises the steps of constructing a simulation model by using simulation data; performing intensity inspection by utilizing transient dynamics according to the simulation model; according to the simulation model, performing insulation performance verification by using an electrostatic field; according to the simulation model, carrying out performance verification of load current by utilizing harmonic waves; according to the method for detecting the assembly precision of the finished product of the on-load tap-changer, the operation reliability of the existing on-load tap-changer can be further improved, and the related performance of the on-load tap-changer of the converter transformer in the aspects of insulation design, reliability, fire prevention and explosion prevention can be improved.
Description
Technical Field
The application relates to the technical field of precision detection, in particular to a method for detecting the assembly precision of a finished product of an on-load tap-changer.
Background
The on-load tap changer is a core component for completing voltage regulation of the converter transformer, and plays an important role in guaranteeing the stability of a direct current transmission system. Compared with an on-load tap-changer for a power transformer, the on-load tap-changer for the converter transformer has the advantages that the voltage regulating range is larger, the action is more frequent, the on-load tap-changer for the converter transformer is powered on and off by the current with extremely high current change rate under the action of harmonic voltage, and the working condition is more severe. In 2018, multiple on-load tap-changer faults occur in domestic direct current engineering successively, and huge risks are brought to safe operation of a main grid frame of the power grid.
The faults of the on-load tap-changer of the converter transformer frequently generated in recent time indicate that the operation reliability of the on-load tap-changer of the converter transformer supplied by foreign manufacturers still needs to be further improved. Particularly, a great deal of research work still needs to be carried out in the aspects of insulation design, reliability test methods and fireproof and explosion-proof performances in the on-load tap-changer of the converter transformer.
Based on the above consideration, the localization key technical research of the on-load tap-changer of the high-capacity converter transformer is developed, localization of the on-load tap-changer of the converter transformer is promoted, the running reliability of the on-load tap-changer of the converter transformer and the operation and maintenance technical level of the switch are further improved, meanwhile, the application of the localization on-load tap-changer can effectively reduce the construction cost of the extra-high voltage direct current engineering, and the dependence on foreign products is eliminated.
Disclosure of Invention
This section is intended to outline some aspects of embodiments of the application and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section as well as in the description of the application and in the title of the application, which may not be used to limit the scope of the application.
The present application has been made in view of the above-described problems.
Therefore, the technical problems solved by the application are as follows: the running reliability of the existing on-load tap-changer still needs to be further improved, and particularly, a great deal of research work still needs to be carried out in the aspects of insulation design, reliability test method and fireproof and explosion-proof performance of the on-load tap-changer of the converter transformer.
In order to solve the technical problems, the application provides the following technical scheme: the method for detecting the assembly precision of the finished product of the on-load tap-changer comprises the following steps,
constructing a simulation model by using simulation data;
performing intensity inspection by utilizing transient dynamics according to the simulation model;
according to the simulation model, performing insulation performance verification by using an electrostatic field;
and according to the simulation model, carrying out performance verification of load current by utilizing harmonic waves.
As a preferable scheme of the method for detecting the assembly precision of the finished product of the on-load tap-changer, the application comprises the following steps: the simulation model includes a model of the simulation model,
changing the boss angle from 25-50 degrees and a mechanical simulation model with a step length of 1 degree;
splitting the tapping switch into electrostatic field models of all parts;
the power supply voltage waveform is a sine wave, the total harmonic content is not more than 5%, the even harmonic content is not more than 1%, and the total harmonic of the load current is not more than 5% of the rated current.
As a preferable scheme of the method for detecting the assembly precision of the finished product of the on-load tap-changer, the application comprises the following steps: the strength test by utilizing transient dynamics is to carry out transient dynamics simulation analysis of the tap switch based on an explicit nonlinear dynamics analysis method;
the transient dynamics is an analytical method for determining the dynamic response of a structure under time-varying loading, thereby determining the time-varying displacement, strain and stress of the structure under a random combination of static, transient and simple harmonic loading.
As a preferable scheme of the method for detecting the assembly precision of the finished product of the on-load tap-changer, the application comprises the following steps: the calculation formula of the transient dynamics is as follows:
wherein ,t+Δt u i expressed as the stress at time t + deltat,expressed as the strain at time t + deltat, t+Δt q represents the virtual work of external force of t+delta t;
for space finite element discretization, use 0 x i ， t x i ， t+Δt x i (i=1, 2, 3) respectively represents the displacement coordinates of each point in the object at time 0, time t and time t+Δt, using t u i ， t+Δt u i (i=1, 2, 3) represents the displacement of each particle at time t and time t+Δt, respectively.
As a preferable scheme of the method for detecting the assembly precision of the finished product of the on-load tap-changer, the application comprises the following steps: the analysis method of the dynamic response is a nonlinear motion process of large displacement and small deformation, and a motion equation solved by adopting corresponding space motion description and defined transient dynamic analysis is as follows:
wherein [ M]Representing a quality matrix [ C]Represents a damping matrix [ K ]]Representing a matrix of stiffness values,representing node acceleration vector, ++>Represents a node velocity vector, { u } represents a node displacement vector, { F (t) } represents a load vector at time t.
As a preferable scheme of the method for detecting the assembly precision of the finished product of the on-load tap-changer, the application comprises the following steps: the insulation performance verification by using the electrostatic field is to calculate the distribution condition of the surface field intensity of each component of the tapping switch by using a Maxwell equation set to verify the insulation performance of the tapping switch;
when the electric field is a low-frequency time-varying periodic field, electromagnetic induction and displacement current are ignored, and the Maxwell equation set is as follows:
when d=epsilon E,when the maxwell equations are simplified as:
wherein epsilon is the dielectric constant in the medium, p is the binding charge density, D is the electric displacement vector, E is the total electric field strength,is the permeability in the medium.
As a preferable scheme of the method for detecting the assembly precision of the finished product of the on-load tap-changer, the application comprises the following steps: the simplification of the maxwell's equations is determined jointly by the initial conditions and the boundary conditions, which are dirichlet boundary conditions and newman boundary conditions.
As a preferable scheme of the method for detecting the assembly precision of the finished product of the on-load tap-changer, the application comprises the following steps: the dirichlet boundary condition is a mandatory boundary condition, indicating that the potential is given on a certain boundary, and that the electric field strength vector is perpendicular to this boundary, specifically expressed as:
f＝φ|L1
where f represents the normal derivative, L1 represents a given potential value, and phi represents the laplace operator.
As a preferable scheme of the method for detecting the assembly precision of the finished product of the on-load tap-changer, the application comprises the following steps: the neoman boundary condition indicates that the normal derivative on a certain boundary is given, and when the given value is 0, the electric field intensity vector is parallel to the boundary, specifically expressed as:
wherein f represents the normal derivative,representing a fixed constant, s representing a constraint.
As a preferable scheme of the method for detecting the assembly precision of the finished product of the on-load tap-changer, the application comprises the following steps: the performance verification of load current by utilizing harmonic waves is carried out by using a simulation model with a power voltage waveform as a sine wave, the total harmonic content not exceeding 5%, the even harmonic content not exceeding 1% and the total harmonic content of load current not exceeding 5% of rated current;
the simulation verification is that in a direct current transmission system, the total harmonic quantity of current flowing through a converter transformer and an on-load tap changer does not exceed a specified value.
The application has the beneficial effects that: the application provides a method for detecting the assembly precision of a finished product of an on-load tap-changer, which can further improve the operation reliability of the existing on-load tap-changer and can improve the related performance in the aspects of insulation design, reliability, fire prevention and explosion prevention of the on-load tap-changer of a converter transformer.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
fig. 1 is a schematic diagram of overall method steps of a method for detecting assembly accuracy of a finished product of an on-load tap-changer according to the present application.
Fig. 2 is a schematic diagram of stress of each component of the tap changer under different boss angles according to the method for detecting the assembly accuracy of the finished product of the on-load tap changer.
Fig. 3 is a schematic diagram of a change of recovery voltage under the action of harmonic wave according to the method for detecting the assembly accuracy of the finished product of the on-load tap-changer.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present application can be understood in detail, a more particular description of the application, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, but the present application may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present application is not limited to the specific embodiments disclosed below.
Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the application. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
While the embodiments of the present application have been illustrated and described in detail in the drawings, the cross-sectional view of the device structure is not to scale in the general sense for ease of illustration, and the drawings are merely exemplary and should not be construed as limiting the scope of the application. In addition, the three-dimensional dimensions of length, width and depth should be included in actual fabrication.
Also in the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "upper, lower, inner and outer", etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first, second, or third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The terms "mounted, connected, and coupled" should be construed broadly in this disclosure unless otherwise specifically indicated and defined, such as: can be fixed connection, detachable connection or integral connection; it may also be a mechanical connection, an electrical connection, or a direct connection, or may be indirectly connected through an intermediate medium, or may be a communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
Example 1
Referring to fig. 1, there is provided a method for detecting assembly accuracy of a finished on-load tap-changer, comprising the steps of,
s1: and constructing a simulation model by using the simulation data.
In particular, the constructed simulation model includes,
changing the boss angle from 25-50 degrees and a mechanical simulation model with a step length of 1 degree;
splitting the tapping switch into electrostatic field models of all parts;
the power supply voltage waveform is a sine wave, the total harmonic content is not more than 5%, the even harmonic content is not more than 1%, and the total harmonic of the load current is not more than 5% of the rated current.
S2: and according to the simulation model, performing intensity test by utilizing transient dynamics.
Specifically, the strength test by utilizing transient dynamics is based on the transient dynamics simulation analysis of the tap changer by an explicit nonlinear dynamics analysis method.
Further, the transient dynamics is an analytical method for determining the dynamic response of the structure under time-varying loading, thereby determining the time-varying displacement, strain and stress of the structure under random combinations of static, transient and simple harmonic loading.
Further, the transient dynamics is calculated as follows:
wherein ,t+Δt u i expressed as the stress at time t + deltat,expressed as the strain at time t + deltat, t+Δt q is the virtual work of the external force of t+deltat.
For space finite element discretization, use 0 x i ， t x i ， t+Δt x i (i=1, 2, 3) respectively represents the displacement coordinates of each point in the object at time 0, time t and time t+Δt, using t u i ， t+Δt u i (i=1, 2, 3) represents the displacement of each particle at time t and time t+Δt, respectively.
Further specifically, the analysis method of the dynamic response is a nonlinear motion process of large displacement and small deformation, and a motion equation solved by transient dynamic analysis adopting corresponding space motion description and definition is as follows:
wherein [ M]Representing a quality matrix [ C]Represents a damping matrix [ K ]]Representing a matrix of stiffness values,representing node acceleration vector, ++>Represents a node velocity vector, { u } represents a node displacement vector, { F (t) } represents a load vector at time t.
S3: and according to the simulation model, performing insulation performance verification by using an electrostatic field.
Specifically, the insulation performance verification by using the electrostatic field is to calculate the distribution condition of the surface field intensity of each component of the tapping switch by using a Maxwell equation set to verify the insulation performance of the tapping switch.
Further, when the electric field is a low-frequency time-varying periodic field, electromagnetic induction and displacement current are ignored, and the maxwell equation set is as follows:
when d=epsilon E,when the maxwell equations are simplified as:
wherein epsilon is the dielectric constant in the medium, p is the binding charge density, D is the electric displacement vector, E is the total electric field strength,is the permeability in the medium.
More specifically, the simplification of the maxwell's equations is determined by both the initial conditions and the boundary conditions, which are dirichlet boundary conditions and newman boundary conditions.
Further, the dirichlet boundary condition is a mandatory boundary condition, indicating that the potential is given at a certain boundary, and that the electric field strength vector is perpendicular to the boundary, specifically expressed as:
f＝φ|L1
where f represents the normal derivative, L1 represents a given potential value, and phi represents the laplace operator.
In particular, the neoman boundary condition indicates that the normal derivative on a certain boundary is given, and when a given value is 0, the electric field intensity vector is parallel to the boundary, specifically expressed as:
wherein f represents the normal derivative,representing a fixed constant, s representing a constraint.
S4: and according to the simulation model, carrying out performance verification of load current by utilizing harmonic waves.
Specifically, the performance verification of load current by using harmonic wave is carried out by using a simulation model with a power voltage waveform as a sine wave, the total harmonic content not exceeding 5%, the even harmonic content not exceeding 1% and the total harmonic content of load current not exceeding 5% of rated current.
Further, the simulation verification is that in a direct current transmission system, the total harmonic quantity of current flowing through a converter transformer and an on-load tap changer does not exceed a specified value.
Example 2
Referring to fig. 2 to 3, a practical application case of a method for detecting assembly accuracy of a finished product of an on-load tap-changer is provided for a second embodiment of the present application.
By constructing a mechanical simulation model which changes the boss angle from 25 degrees to 50 degrees and has a step length of 1 degree, and carrying out strength test by utilizing transient dynamics, the method is concretely as shown in the following table:
from the above table it is readily apparent that the maximum stress values of the key parts of the tap changer at different boss angles when moving to 0.009499s are shown in the above table, wherein at part of the boss angles the maximum stress of the part 9 exceeds the yield strength of the material, but does not exceed the tensile limit of the material, and the remaining parts do not exceed the yield strength or tensile limit of the material.
By adopting the technical scheme of the application, the tensile limit and the stress condition of each part can be quickly found, so that the strength test of each part can be quickly and timely carried out.
Through electrostatic field models of steel, red copper, brass, copper tungsten, aluminum alloy and nylon respectively serving as the materials of all the parts, and the insulating performance is verified by utilizing electrostatic fields.
The electrostatic field model material parameters are shown in the following table:
| sequence number | Material name | Relative dielectric constant | Conductivity (S/m) |
| 1 | 45# steel | 1 | 2000000 |
| 2 | Red copper | 1 | 58000000 |
| 3 | Brass | 1 | 15000000 |
| 4 | Copper tungsten | 1 | 18200000 |
| 5 | Aluminum alloy | 1 | 38000000 |
| 6 | SMC | 4.5 | 0 |
| 7 | Nylon | 3 | 0 |
| 8 | Epoxy resin | 5 | 0 |
| 9 | Transformer oil | 2.2 | 0 |
Under the action of electrostatic field, the field intensity distribution of each component is as follows:
the two results are combined, and it is easy to find that under the action of main insulation 150kV power frequency voltage, the maximum value of the surface field intensity of each part is smaller than 7kV/mm, and the maximum value can be multiplied by root number 2 for the sake of simplicity by considering that 150kV is only an effective value, and is smaller than 10kV/mm, and is also smaller than a tolerance value.
The power supply voltage waveform is a sine wave, the total harmonic content is not more than 5%, the even harmonic content is not more than 1%, the total harmonic of the load current is not more than 5% of the rated current, and the performance of the load current is verified by utilizing the harmonic, and the specific table is as follows:
| harmonic order | Arc current I | Recovery voltage UR | Ampere meter rate di/dt |
| 5 times | 65A | 104V | 0.144A/us |
| 11 times | 65A | 104V | 0.317A/us |
| 23 times | 65A | 104V | 0.663A/us |
It is easy to find from the above table results that, because the harmonic amplitude is smaller, the recovery voltage effect of the harmonic current of the direct current system on the on-load tap changer of the converter transformer is negligible under normal conditions, but if the harmonic frequency is very high, di/dt caused by the harmonic frequency is very large, so that the rising speed of the recovery voltage is obviously improved.
Furthermore, in order to provide a concise description of the exemplary embodiments, all features of an actual implementation may not be described (i.e., those not associated with the best mode presently contemplated for carrying out the application, or those not associated with practicing the application).
It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure.
It should be noted that the above embodiments are only for illustrating the technical solution of the present application and not for limiting the same, and although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present application may be modified or substituted without departing from the spirit and scope of the technical solution of the present application, which is intended to be covered in the scope of the claims of the present application.
Claims (10)
1. The method for detecting the assembly precision of the finished product of the on-load tap-changer is characterized by comprising the following steps of: comprises the steps of,
constructing a simulation model by using simulation data;
performing intensity inspection by utilizing transient dynamics according to the simulation model;
according to the simulation model, performing insulation performance verification by using an electrostatic field;
and according to the simulation model, carrying out performance verification of load current by utilizing harmonic waves.
2. The method for detecting the assembly precision of the finished product of the on-load tap-changer according to claim 1, wherein the method comprises the following steps of: the simulation model includes a model of the simulation model,
changing the boss angle from 25-50 degrees and a mechanical simulation model with a step length of 1 degree;
splitting the tapping switch into electrostatic field models of all parts;
the power supply voltage waveform is a sine wave, the total harmonic content is not more than 5%, the even harmonic content is not more than 1%, and the total harmonic of the load current is not more than 5% of the rated current.
3. The method for detecting the assembly precision of the finished product of the on-load tap-changer according to claim 1, wherein the method comprises the following steps of: the strength test by utilizing transient dynamics is to carry out transient dynamics simulation analysis of the tap switch based on an explicit nonlinear dynamics analysis method;
the transient dynamics is an analytical method for determining the dynamic response of a structure under time-varying loading, thereby determining the time-varying displacement, strain and stress of the structure under a random combination of static, transient and simple harmonic loading.
4. The method for detecting the assembly precision of the finished product of the on-load tap-changer according to claim 3, wherein the method comprises the following steps of: the calculation formula of the transient dynamics is as follows:
wherein ,t+Δt u i expressed as the stress at time t + deltat,expressed as the strain at time t + deltat, t+Δt q represents the virtual work of external force of t+delta t;
for space finite element discretization, use 0 x i ， t x i ， t+Δt x i (i=1, 2, 3) respectively represents the displacement coordinates of each point in the object at time 0, time t and time t+Δt, using t u i ， t+Δt u i (i=1, 2, 3) represents the displacement of each particle at time t and time t+Δt, respectively.
5. The method for detecting the assembly precision of the finished product of the on-load tap-changer according to claim 4, wherein the method comprises the following steps of: the analysis method of the dynamic response is a nonlinear motion process of large displacement and small deformation, and a motion equation solved by adopting corresponding space motion description and defined transient dynamic analysis is as follows:
wherein [ M]Representing a quality matrix [ C]Represents a damping matrix [ K ]]Representing a matrix of stiffness values,representing node acceleration vector, ++>Representing node velocity vectors{ u } represents a node displacement vector, { F (t) } represents a load vector at time t.
6. The method for detecting the assembly precision of the finished product of the on-load tap-changer according to claim 1, wherein the method comprises the following steps of: the insulation performance verification by using the electrostatic field is to calculate the distribution condition of the surface field intensity of each component of the tapping switch by using a Maxwell equation set to verify the insulation performance of the tapping switch;
when the electric field is a low-frequency time-varying periodic field, electromagnetic induction and displacement current are ignored, and the Maxwell equation set is as follows:
when d=epsilon E,when the maxwell equations are simplified as:
wherein epsilon is the dielectric constant in the medium, p is the binding charge density, D is the electric displacement vector, E is the total electric field strength,is the permeability in the medium.
7. The method for detecting the assembly accuracy of the finished product of the on-load tap-changer according to claim 6, wherein the method comprises the following steps of: the simplification of the maxwell's equations is determined jointly by the initial conditions and the boundary conditions, which are dirichlet boundary conditions and newman boundary conditions.
8. The method for detecting the assembly accuracy of the finished product of the on-load tap-changer according to claim 7, wherein the method comprises the following steps of: the dirichlet boundary condition is a mandatory boundary condition, indicating that the potential is given on a certain boundary, and that the electric field strength vector is perpendicular to this boundary, specifically expressed as:
f＝φL1
where f represents the normal derivative, L1 represents a given potential value, and phi represents the laplace operator.
9. The method for detecting the assembly accuracy of the finished product of the on-load tap-changer according to claim 7, wherein the method comprises the following steps of: the neoman boundary condition indicates that the normal derivative on a certain boundary is given, and when the given value is 0, the electric field intensity vector is parallel to the boundary, specifically expressed as:
wherein f represents the normal derivative,representing a fixed constant, s representing a constraint.
10. The method for detecting the assembly precision of the finished product of the on-load tap-changer according to any one of claims 1 to 9, which is characterized in that: the performance verification of load current by utilizing harmonic waves is carried out by using a simulation model with a power voltage waveform as a sine wave, the total harmonic content not exceeding 5%, the even harmonic content not exceeding 1% and the total harmonic content of load current not exceeding 5% of rated current;
the simulation verification is that in a direct current transmission system, the total harmonic quantity of current flowing through a converter transformer and an on-load tap changer does not exceed a specified value.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110763992A (en) * | 2019-11-28 | 2020-02-07 | 国网河北省电力有限公司电力科学研究院 | AC/DC comprehensive test method for on-load tap-changer of large transformer |
| CN113312822A (en) * | 2021-06-08 | 2021-08-27 | 福建工程学院 | Method for predicting multi-axial fatigue life of bearing of tire unloader |
| CN114878977A (en) * | 2022-03-31 | 2022-08-09 | 上海交通大学 | Insulation checking method for on-load tap-changer |
| CN114895176A (en) * | 2022-03-31 | 2022-08-12 | 上海交通大学 | Harmonic switching method for converter transformer vacuum on-load tap-changer |
| CN115718852A (en) * | 2022-10-21 | 2023-02-28 | 国网经济技术研究院有限公司 | Method for analyzing on-off current change rate of vacuum on-load tap-changer of converter transformer |
| CN115730440A (en) * | 2022-11-21 | 2023-03-03 | 上海交通大学 | DC power transmission harmonic current overcurrent judgment method |
| CN115856607A (en) * | 2022-11-30 | 2023-03-28 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Detection device for mixed current switching of vacuum arc extinguish chamber of on-load tap-changer |
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110763992A (en) * | 2019-11-28 | 2020-02-07 | 国网河北省电力有限公司电力科学研究院 | AC/DC comprehensive test method for on-load tap-changer of large transformer |
| CN113312822A (en) * | 2021-06-08 | 2021-08-27 | 福建工程学院 | Method for predicting multi-axial fatigue life of bearing of tire unloader |
| CN114878977A (en) * | 2022-03-31 | 2022-08-09 | 上海交通大学 | Insulation checking method for on-load tap-changer |
| CN114895176A (en) * | 2022-03-31 | 2022-08-12 | 上海交通大学 | Harmonic switching method for converter transformer vacuum on-load tap-changer |
| CN115718852A (en) * | 2022-10-21 | 2023-02-28 | 国网经济技术研究院有限公司 | Method for analyzing on-off current change rate of vacuum on-load tap-changer of converter transformer |
| CN115730440A (en) * | 2022-11-21 | 2023-03-03 | 上海交通大学 | DC power transmission harmonic current overcurrent judgment method |
| CN115856607A (en) * | 2022-11-30 | 2023-03-28 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Detection device for mixed current switching of vacuum arc extinguish chamber of on-load tap-changer |
Non-Patent Citations (3)
| Title |
|---|
| JUN DENG, 2022 IEEE 5TH INTERNATIONAL ELECTRICAL AND ENERGY CONFERENCE (CIEEC), 29 May 2022 (2022-05-29), pages 2 - 4 * |
| 吕金洲: "基于惯性补偿的脉冲风洞测力天平瞬态研究", 振动与冲击, pages 217 - 221 * |
| 高锡明: "换流变压器有载分接开关电场分布特性研究", 变压器, pages 42 - 45 * |
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