CN109188222B - Method and device for detecting insulation fault of air-core reactor - Google Patents
Method and device for detecting insulation fault of air-core reactor Download PDFInfo
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- CN109188222B CN109188222B CN201811140387.5A CN201811140387A CN109188222B CN 109188222 B CN109188222 B CN 109188222B CN 201811140387 A CN201811140387 A CN 201811140387A CN 109188222 B CN109188222 B CN 109188222B
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- 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
Abstract
The invention provides a method and a device for detecting an insulation fault of an air reactor, which relate to the technical field of electricity safety and comprise the following steps: inputting high-frequency current with preset frequency into the air reactor; acquiring target information of the air reactor according to a first preset period, wherein the target information comprises at least one of the following: the method comprises the following steps of (1) wire diameter temperature information of the air reactor, conductivity information of the air reactor and signal intensity value of a vibration energy signal of the air reactor; calculating a target parameter based on the target information, wherein the target parameter is the ratio of the signal intensity value of the vibration energy signal of the air reactor to the linear diameter temperature of the air reactor; whether the air reactor has the insulation fault or not is determined based on the target information and the target parameters, and the technical problem that the detection result accuracy is low in the existing air reactor insulation fault detection method is solved.
Description
Technical Field
The invention relates to the technical field of electricity utilization safety, in particular to a method and a device for detecting an insulation fault of an air reactor.
Background
The air core reactor is one of the common components of the power grid, plays a great role in the daily operation process of the power grid, and the insulation performance of the air core reactor is an attribute which needs to be carefully considered in the power utilization safety problem.
Since the air core reactor is a component of a multilayer structure, how to detect the insulation performance of the air core reactor becomes a very difficult problem.
The existing air-core reactor insulation fault detection usually adopts a voltage method and a large current method, wherein when the voltage method is adopted to detect the insulation fault of the air-core reactor, the detection accuracy is low; when the insulation fault of the air reactor is detected by adopting a large current method, the phenomenon that a wire core of the air reactor is burnt out may occur.
No effective solution has been proposed to the above problems.
Disclosure of Invention
In view of this, the present invention aims to provide a method and a device for detecting an insulation fault of an air-core reactor, so as to alleviate the technical problem of low accuracy of a detection result of the existing method for detecting an insulation fault of an air-core reactor.
In a first aspect, an embodiment of the present invention provides a method for detecting an insulation fault of an air-core reactor, where the method includes: inputting high-frequency current with preset frequency into the air reactor; acquiring target information of the air reactor according to a first preset period, wherein the target information comprises: the wire diameter temperature information of the air reactor, the conductivity information of the air reactor and the signal intensity value of the vibration energy signal of the air reactor; calculating a target parameter based on the target information, wherein the target parameter is the ratio of the signal intensity value of the vibration energy signal of the air reactor to the linear diameter temperature of the air reactor; and determining whether the air-core reactor has an insulation fault or not based on the target information and the target parameter.
Further, determining whether an insulation fault of the air core reactor occurs based on the target information and the target parameter includes: determining whether an insulation fault of the air core reactor occurs based on the target information; and judging whether the air-core reactor has an insulation fault or not based on the target parameter.
Further, determining whether an insulation fault of the air reactor occurs based on the target information includes calculating a first ratio between a target temperature and an electrical conductivity corresponding to the target temperature when the wire diameter temperature of the air reactor is the target temperature based on the wire diameter temperature information of the air reactor and the electrical conductivity information of the air reactor; and if the first ratio is larger than or smaller than a first preset range, determining that the air-core reactor has an insulation fault.
Further, determining whether an insulation fault of the air-core reactor occurs based on the target information further includes: calculating a time period between the moment when the air reactor inputs the high-frequency current with the preset frequency and the moment when the wire diameter temperature is the target temperature; and if the time period is greater than or less than a second preset range, determining that the air reactor has an insulation fault.
Further, determining whether an insulation fault of the air-core reactor occurs based on the target parameter further includes: calculating a second ratio of the signal intensity value of the vibration energy signal to the linear diameter temperature of the air-core reactor in a target time period; and if the second ratio is larger than or smaller than a third preset range, determining that the air reactor has an insulation fault.
Further, the method further comprises: according toIncreasing the frequency of the high-frequency current input into the air-core reactor by a preset value in a second preset period to obtain a frequency data set A ═ A1，A2...An) Wherein A isiThe frequency of the high-frequency current input into the air-core reactor in the ith preset period is shown, and n is the number of the preset periods; acquiring the wire diameter temperature of the air reactor in each preset period to obtain a temperature information group B ═ B (B)1，B2...Bn) Wherein B isiThe wire diameter temperature of the air-core reactor at the end of the ith second preset period; and constructing a target characteristic curve based on the frequency data group and the temperature information group, and if the target characteristic curve is a nonlinear characteristic curve, the air reactor breaks down.
In a second aspect, an embodiment of the present invention provides a detection apparatus for an insulation fault of an air-core reactor, where the apparatus includes: the device comprises an input unit, a collecting unit, a calculating unit and a determining unit, wherein the input unit is used for inputting high-frequency current with preset frequency into the air reactor; the acquisition unit is used for acquiring target information of the air-core reactor according to a first preset period, wherein the target information comprises at least one of the following information: the wire diameter temperature information of the air reactor, the conductivity information of the air reactor and the signal intensity value of the vibration energy signal of the air reactor; the calculation unit is used for calculating a target parameter based on the target information, wherein the target parameter is the ratio of the signal intensity value of the vibration energy signal of the air reactor to the linear diameter temperature of the air reactor; the determination unit is used for determining whether the air-core reactor has an insulation fault or not based on the target information and the target parameter.
Further, the determining unit includes: a first sub-determination unit and a second sub-determination unit, wherein the first sub-determination unit is used for determining whether the air-core reactor has an insulation fault or not based on the target information; the second sub-determination unit is used for judging whether the air-core reactor has an insulation fault or not based on the target parameter.
Further, the first sub-determination unit is further configured to: calculating a first ratio between the target temperature and the conductivity corresponding to the target temperature when the linear diameter temperature of the air reactor is the target temperature based on the linear diameter temperature information of the air reactor and the conductivity information of the air reactor; and if the first ratio is larger than or smaller than a first preset range, determining that the air-core reactor has an insulation fault.
Further, the second sub-determination unit is further configured to: calculating a time period between the moment when the air reactor inputs the high-frequency current with the preset frequency and the moment when the wire diameter temperature is the target temperature; and if the time period is greater than or less than a second preset range, determining that the air reactor has an insulation fault.
In the embodiment of the invention, the high-frequency current with the preset frequency is input into the air reactor, the information such as the conductivity change information, the linear-diameter temperature change information and the signal intensity value of the vibration energy signal of the air reactor is acquired according to the first preset period, and then the information is comprehensively analyzed and judged to determine whether the air reactor has a fault, so that the purpose of improving the accuracy of the insulation fault detection result of the air reactor is achieved, and the technical problem that the detection result accuracy is low because the existing insulation fault detection method of the air reactor judges whether the air reactor has a fault through the experience of a detector is solved, thereby realizing the technical effect of improving the accuracy of the insulation fault detection result of the air reactor.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a method for detecting an insulation fault of an air-core reactor according to an embodiment of the present invention;
FIG. 2 is another method for detecting an insulation fault of an air-core reactor according to an embodiment of the present invention;
FIG. 3 is another method for detecting an insulation fault of an air-core reactor according to an embodiment of the present invention;
FIG. 4 is another method for detecting an insulation fault of an air-core reactor according to an embodiment of the present invention;
fig. 5 is a detection device for an insulation fault of an air-core reactor according to an embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
according to an embodiment of the present invention, there is provided an embodiment of a method for detecting an insulation fault of an air core reactor, it should be noted that the steps shown in the flowchart of the drawings may be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in an order different from that here.
Fig. 1 is a method for detecting an insulation fault of an air-core reactor according to an embodiment of the present invention, as shown in fig. 1, the method includes the steps of:
step S102, inputting high-frequency current with preset frequency into the air reactor;
step S104, acquiring target information of the air-core reactor according to a first preset period, wherein the target information comprises at least one of the following: the wire diameter temperature information of the air reactor, the conductivity information of the air reactor and the signal intensity value of the vibration energy signal of the air reactor;
step S106, calculating a target parameter based on the target information, wherein the target parameter is the ratio of the signal intensity value of the vibration energy signal of the air reactor to the linear diameter temperature of the air reactor;
and step S108, determining whether the air-core reactor has insulation fault or not based on the target information and the target parameters.
In the embodiment of the invention, the high-frequency current with the preset frequency is input into the air reactor, the information such as the conductivity change information, the linear-diameter temperature change information and the signal intensity value of the vibration energy signal of the air reactor is acquired according to the first preset period, and then the information is comprehensively analyzed and judged to determine whether the air reactor has a fault, so that the purpose of improving the accuracy of the insulation fault detection result of the air reactor is achieved, and the technical problem that the detection result accuracy is low because the existing insulation fault detection method of the air reactor judges whether the air reactor has a fault through the experience of a detector is solved, thereby realizing the technical effect of improving the accuracy of the insulation fault detection result of the air reactor.
It should be noted that, because a voltage method is generally adopted in the existing air reactor insulation fault detection method, if a current method is adopted to perform insulation fault detection on an air reactor, a large current needs to be input into the air reactor, and a wire core of the air reactor is easily burnt.
Therefore, the method for inputting the high-frequency current into the air reactor is adopted, the high-frequency current can realize accurate current control through the variable frequency power supply, and the high-frequency signal is mainly transmitted along the surface of the insulating layer of the air reactor, so that the surface of the insulating layer is heated, and the insulation fault of the air reactor can be detected more safely and accurately.
In addition, the frequency range of the high-frequency current signal is 1kHz-100 kHz; the first preset period may be set by a detection person according to an actual situation, and is not specifically limited in the embodiment of the present invention.
In the embodiment of the present invention, as shown in fig. 2, step S108 further includes the following steps:
step S1081, determining whether an insulation fault occurs in the air-core reactor based on the target information;
and step S1082, determining whether the air-core reactor has an insulation fault or not based on the target parameter.
In the embodiment of the invention, whether the air reactor has the insulation fault or not can be determined respectively through the target information and the target parameters, and the target parameters have certain physical significance, so that whether the air reactor has the insulation fault or not is determined through the target parameters, the accuracy is higher, and the practical value is higher.
In the embodiment of the present invention, as shown in fig. 3, step S1081 includes the following steps:
step S11, calculating a first ratio between the target temperature and the electric conductivity corresponding to the target temperature when the wire diameter temperature of the air reactor is the target temperature based on the wire diameter temperature information of the air reactor and the electric conductivity information of the air reactor;
and step S12, if the first ratio is larger than or smaller than a first preset range, determining that the air-core reactor has an insulation fault.
In the embodiment of the present invention, the conductivity is a parameter directly related to the metal material, and in the pure metal material, the conductivity can be considered as the inverse of the resistivity. In practice, however, the electrical conductivity is a very temperature-dependent quantity, and the higher the temperature of the metal material, the lower the electrical conductivity of the metal material. And the relationship between the conductivity and the temperature shows an irregular nonlinear characteristic according to the difference of the doped materials of the metal materials.
Therefore, when the air reactor is subjected to turn-to-turn short circuit, part of the insulating material is changed, and the change trend of the electric conductivity is greatly different from the normal value in a high-temperature environment, so that when the line diameter temperature of the air reactor is the target temperature, if the ratio of the target temperature to the electric conductivity corresponding to the target temperature is larger than or smaller than a second preset range, the air reactor can be judged to have an insulation fault.
It should be noted that, because the first preset ranges corresponding to different types of air reactors are also different, the specific numerical value of the first preset range is not specifically limited, and the target temperature may be set by a detection person according to an actual situation, which is not specifically limited in the embodiment of the present invention.
In the embodiment of the present invention, as shown in fig. 3, step S1081 further includes the following steps:
step S21, calculating a time period between the time when the air reactor inputs the high-frequency current with the preset frequency and the time when the wire diameter temperature is the target temperature;
and step S22, if the time period is larger than or smaller than a second preset range, determining that the air reactor has an insulation fault.
In the embodiment of the invention, the time period between the moment when the air reactor inputs the high-frequency current with the preset frequency and the moment when the wire diameter temperature is the target temperature is calculated.
And if the time period is greater than or less than the second preset range, determining that the air reactor has an insulation fault.
When the time period is larger than a second preset range, the longer the temperature rise time is, the longer the temperature rise target temperature is reached, or the temperature rise nonlinear region is too long, namely the longer time is spent in the inflection point transition region, and the turn-to-turn insulation strand breakage of the air-core reactor is considered.
For example, when the time period is 6 minutes and the second preset range is 4-5 minutes, and the time period is greater than the preset range, it may be considered that the air-core reactor has a fault of inter-turn insulation strand breakage.
When the time period is smaller than a second preset range, the air core reactor normally has a turn-to-turn short circuit fault.
For example, when the time period is 3 minutes, and the second preset range is 4-5 minutes, and the time period is greater than the preset range, it may be considered that the air-core reactor has a turn-to-turn short circuit fault.
In addition, it should be noted that, since the second preset ranges corresponding to different types of air-core reactors are also different, specific values of the second preset ranges are not specifically limited.
In the embodiment of the present invention, as shown in fig. 3, step S1081 further includes the following steps:
step S31, calculating the ratio of the signal intensity value of the vibration energy signal to the wire diameter temperature of the air-core reactor in a target time period;
and step S32, if the second ratio is larger than or smaller than a third preset range, determining that the air reactor has an insulation fault.
In the embodiment of the invention, the ratio of the signal intensity value of the vibration energy signal of the air-core reactor to the linear diameter temperature of the air-core reactor in the target time period is calculated.
And if the second ratio is larger than or smaller than a third preset range, the air-core reactor can be determined to have an insulation fault.
The target time period is 5 to 15 minutes after the wire diameter temperature of the air-core reactor reaches the preset temperature.
In addition, it should be noted that, since the third preset ranges corresponding to different types of air-core reactors are also different, specific numerical values of the third preset ranges are not specifically limited.
The vibration energy signal of the air reactor is another important index for reflecting the turn-to-turn insulation fault of the air reactor. However, after the breakdown of the common turn-to-turn insulation, the vibration signal is not easy to be measured directly because: (a) the air reactor is of a multilayer structure, the more the turn-to-turn insulation breakdown position is at the outer layer, the easier the detection is, and on the contrary, the more the inner layer is, the more difficult the identification is. (b) The vibration signal generated by turn-to-turn insulation breakdown is very weak, and if a traditional power frequency signal test is adopted, a very huge power frequency current device is needed to obtain a corresponding vibration energy signal.
According to the embodiment of the invention, the high-frequency current signal is adopted, so that the energy of the vibration signal is increased, the technical difficulty of detection and identification is reduced, and meanwhile, according to experience, in order to enhance the accuracy of the obtained vibration energy information number, the vibration energy signal of the air reactor needs to be collected within 5-15 minutes after the wire diameter temperature of the air reactor reaches the target temperature.
In the embodiment of the present invention, as shown in fig. 4, the method further includes the following steps:
step S202, increasing the frequency of the high-frequency current input into the air-core reactor by a preset value according to a second preset period to obtain a frequency data set A ═ (A ═ A)1，A2...An) Wherein A isiThe frequency of the high-frequency current input into the air-core reactor in the ith preset period is shown, and n is the number of the preset periods;
step S204, acquiring the wire diameter temperature of the air reactor in each preset period to obtain a temperature information group B ═ B (B)1，B2...Bn) Wherein B isiThe wire diameter temperature of the air-core reactor at the end of the ith second preset period;
and S206, constructing a target characteristic curve based on the frequency data group and the temperature information group, and determining that the air reactor has a fault if the target characteristic curve is a nonlinear characteristic curve.
In the embodiment of the invention, firstly, according to a second preset period, the frequency of the high-frequency current input into the air-core reactor is increased by a preset value to obtain a frequency data set.
It should be noted that the second preset period may be set by an operator according to an actual situation, and is not specifically limited in the embodiment of the present invention, and generally the second preset period is 1 minute.
And then, acquiring the wire diameter temperature of the air-core reactor when each second preset period is bundled to obtain a temperature information group.
And finally, constructing a target characteristic curve according to the frequency information group and the temperature information group, and if the target characteristic curve is a nonlinear curve, the air-core reactor has an insulation fault.
Example two:
the invention also provides a detection device for the insulation fault of the air reactor, which is used for executing the detection method for the insulation fault of the air reactor provided by the embodiment of the invention.
As shown in fig. 5, the detection device for the insulation fault of the air-core reactor comprises: an input unit 10, an acquisition unit 20, a calculation unit 30 and a determination unit 40, wherein,
the input unit 10 is used for inputting a high-frequency current with a preset frequency into the air-core reactor;
the acquisition unit 20 is configured to acquire target information of the air-core reactor according to a first preset period, where the target information includes at least one of: the wire diameter temperature information of the air reactor, the conductivity information of the air reactor and the signal intensity value of the vibration energy signal of the air reactor;
the calculating unit 30 is configured to calculate a target parameter based on the target information, where the target parameter is a ratio of a signal intensity value of the vibration energy signal of the air reactor to a linear diameter temperature of the air reactor;
the determination unit 40 is configured to determine whether an insulation fault occurs in the air-core reactor based on the target information and the target parameter.
In the embodiment of the invention, the input unit inputs the high-frequency current with the preset frequency into the air reactor, the acquisition unit acquires the information such as the conductivity change information, the linear-diameter temperature change information and the signal intensity value of the vibration energy signal of the air reactor according to the first preset period, and the calculation unit and the determination unit perform comprehensive analysis and judgment on the information to determine whether the air reactor has a fault, so that the aim of improving the accuracy of the insulation fault detection result of the air reactor is achieved, and the technical problem that the existing insulation fault detection method of the air reactor judges whether the air reactor has a fault through the experience of a detector, so that the accuracy of the detection result is low is solved, and the technical effect of improving the accuracy of the insulation fault detection result of the air reactor is realized.
Optionally, the determining unit includes: a first sub-determination unit and a second sub-determination unit, wherein the first sub-determination unit is used for determining whether the air-core reactor has an insulation fault or not based on the target information; the second sub-determination unit is used for judging whether the air-core reactor has an insulation fault or not based on the target parameter.
Optionally, the first sub-determination unit calculates a first ratio between a target temperature and an electrical conductivity corresponding to the target temperature when the wire diameter temperature of the air core reactor is the target temperature, based on the wire diameter temperature information of the air core reactor and the electrical conductivity information of the air core reactor; and if the first ratio is larger than or smaller than a first preset range, determining that the air-core reactor has an insulation fault.
Optionally, the second determining subunit is further configured to: calculating a time period between the moment when the air reactor inputs the high-frequency current with the preset frequency and the moment when the wire diameter temperature is the target temperature; and if the time period is greater than or less than a second preset range, determining that the air reactor has an insulation fault.
Optionally, the second sub-determination unit is further configured to calculate a second ratio of the signal intensity value of the vibration energy signal to the line diameter temperature of the air-core reactor in a target time period; and if the second ratio is larger than or smaller than a third preset range, determining that the air reactor has an insulation fault.
Optionally, the apparatus further comprises: a third sub-determination unit, configured to increase the frequency of the high-frequency current input to the air-core reactor by a preset value according to a second preset period to obtain a frequency data set a ═ a (a ═ a)1，A2...An) Wherein A isiThe frequency of the high-frequency current input into the air-core reactor in the ith preset period is shown, and n is the number of the preset periods; acquiring the wire diameter temperature of the air reactor in each preset period to obtain a temperature information group B ═ B (B)1，B2...Bn) Wherein B isiThe wire diameter temperature of the air-core reactor at the end of the ith second preset period; and constructing a target characteristic curve based on the frequency data group and the temperature information group, and determining that the air reactor has a fault if the target characteristic curve is a nonlinear characteristic curve.
In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions when actually implemented, and for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of devices or units through some communication interfaces, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a non-volatile computer-readable storage medium executable by a processor. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can still modify or easily conceive of the technical solutions described in the foregoing embodiments or equivalent technical features thereof within the technical scope of the present disclosure; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A method for detecting an insulation fault of an air-core reactor is characterized by comprising the following steps:
inputting high-frequency current with preset frequency into the air reactor;
acquiring target information of the air-core reactor according to a first preset period, wherein the target information comprises at least one of the following: the wire diameter temperature information of the air reactor, the conductivity information of the air reactor and the signal intensity value of the vibration energy signal of the air reactor;
calculating a target parameter based on the target information, wherein the target parameter is the ratio of the signal intensity value of the vibration energy signal of the air reactor to the linear diameter temperature of the air reactor;
determining whether the air-core reactor has an insulation fault or not based on the target information and the target parameter;
wherein the method further comprises:
increasing the frequency of the high-frequency current input into the air-core reactor by a preset value according to a second preset period to obtain a frequency data set A ═ A1，A2...An) Wherein A isiThe frequency of the high-frequency current input into the air-core reactor in the ith preset period is shown, and n is the number of the preset periods;
acquiring the wire diameter temperature of the air reactor in each preset period to obtain a temperature information group B ═ B (B)1，B2...Bn) Wherein B isiThe wire diameter temperature of the air-core reactor at the end of the ith second preset period;
and constructing a target characteristic curve based on the frequency data group and the temperature information group, and determining that the air reactor has a fault if the target characteristic curve is a nonlinear characteristic curve.
2. The method according to claim 1, wherein determining whether an insulation fault of the air core reactor occurs based on the target information and the target parameter comprises:
determining whether an insulation fault of the air core reactor occurs based on the target information;
and determining whether the air-core reactor has an insulation fault or not based on the target parameter.
3. The method according to claim 2, wherein determining whether an insulation fault of the air core reactor occurs based on the target information includes:
calculating a first ratio between the target temperature and the conductivity corresponding to the target temperature when the linear diameter temperature of the air reactor is the target temperature based on the linear diameter temperature information of the air reactor and the conductivity information of the air reactor;
and if the first ratio is larger than or smaller than a first preset range, determining that the air-core reactor has an insulation fault.
4. The method according to claim 2, wherein determining whether an insulation fault of the air core reactor occurs based on the target information further comprises:
calculating a time period between the moment when the air reactor inputs the high-frequency current with the preset frequency and the moment when the wire diameter temperature is the target temperature;
and if the time period is greater than or less than a second preset range, determining that the air reactor has an insulation fault.
5. The method according to claim 3, wherein determining whether an insulation fault of the air core reactor occurs based on the target parameter further comprises:
calculating a second ratio of the signal intensity value of the vibration energy signal to the linear diameter temperature of the air-core reactor in a target time period;
and if the second ratio is larger than or smaller than a third preset range, determining that the air reactor has an insulation fault.
6. An air-core reactor insulation fault detection device, characterized in that the device comprises: an input unit, an acquisition unit, a calculation unit and a determination unit, wherein,
the input unit is used for inputting high-frequency current with preset frequency into the air reactor;
the acquisition unit is used for acquiring target information of the air-core reactor according to a first preset period, wherein the target information comprises at least one of the following information: the wire diameter temperature information of the air reactor, the conductivity information of the air reactor and the signal intensity value of the vibration energy signal of the air reactor;
the calculation unit is used for calculating a target parameter based on the target information, wherein the target parameter is the ratio of the signal intensity value of the vibration energy signal of the air reactor to the linear diameter temperature of the air reactor;
the determination unit is used for determining whether the air-core reactor has an insulation fault or not based on the target information and the target parameter;
wherein the apparatus further comprises: a third sub-determination unit configured to:
increasing the frequency of the high-frequency current input into the air-core reactor by a preset value according to a second preset period to obtain a frequency data set A ═ A1，A2...An) Wherein A isiThe frequency of the high-frequency current input into the air-core reactor in the ith preset period is shown, and n is the number of the preset periods;
acquiring the wire diameter temperature of the air reactor in each preset period to obtain a temperature information group B ═ B (B)1，B2...Bn) Wherein B isiThe wire diameter temperature of the air-core reactor at the end of the ith second preset period;
and constructing a target characteristic curve based on the frequency data group and the temperature information group, and determining that the air reactor has a fault if the target characteristic curve is a nonlinear characteristic curve.
7. The apparatus of claim 6, wherein the determining unit comprises: a first sub-determination unit and a second sub-determination unit, wherein,
the first sub-determination unit is used for determining whether the air-core reactor has an insulation fault or not based on the target information;
the second sub-determination unit is used for judging whether the air-core reactor has an insulation fault or not based on the target parameter.
8. The apparatus of claim 7, wherein the first sub-determination unit is further configured to:
calculating a first ratio between the target temperature and the conductivity corresponding to the target temperature when the linear diameter temperature of the air reactor is the target temperature based on the linear diameter temperature information of the air reactor and the conductivity information of the air reactor;
and if the first ratio is larger than or smaller than a first preset range, determining that the air-core reactor has an insulation fault.
9. The apparatus of claim 7, wherein the second sub-determination unit is further configured to:
calculating a time period between the moment when the air reactor inputs the high-frequency current with the preset frequency and the moment when the wire diameter temperature is the target temperature;
and if the time period is greater than or less than a second preset range, determining that the air reactor has an insulation fault.
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