CN117373807B - Integrated current transformer and fault detection method - Google Patents

Integrated current transformer and fault detection method Download PDF

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Publication number
CN117373807B
CN117373807B CN202311125918.4A CN202311125918A CN117373807B CN 117373807 B CN117373807 B CN 117373807B CN 202311125918 A CN202311125918 A CN 202311125918A CN 117373807 B CN117373807 B CN 117373807B
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China
Prior art keywords
sampling
current
signal
fault
voltage
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CN117373807A (en
Inventor
***
陈亚天
高振伟
刘迪
刘柱
李温静
黄吕超
方金国
胡源源
史文辉
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State Grid Information and Telecommunication Co Ltd
Beijing Guodiantong Network Technology Co Ltd
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State Grid Information and Telecommunication Co Ltd
Beijing Guodiantong Network Technology Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20—Instruments transformers
    • H01F38/22—Instruments transformers for single phase ac
    • H01F38/28—Current transformers
    • H01F38/30—Constructions
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
    • G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H01F27/306—Fastening or mounting coils or windings on core, casing or other support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • H01F27/402—Association of measuring or protective means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20—Instruments transformers
    • H01F38/22—Instruments transformers for single phase ac
    • H01F38/28—Current transformers
    • H01F38/30—Constructions
    • H01F2038/305—Constructions with toroidal magnetic core

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

Embodiments of the present disclosure disclose an integrated current transformer and fault detection method. One embodiment of the integrated current transformer comprises: insulating housing, current transformer module, cable conductor and aviation plug, wherein: the insulating shell is arranged outside the current transformer module; the current transformer module is in power supply connection with an external circuit; the current transformer module is connected with the aviation plug through a cable circuit; the aviation plug is in power supply connection with external active equipment, wherein the aviation plug is used for sending voltage sampling signals and electric energy of an external circuit acquired by the current transformer module to the external active equipment. This embodiment improves the applicability of the current transformer.

Description

Integrated current transformer and fault detection method
Technical Field
Embodiments of the present disclosure relate to the field of transformers, and in particular, to an integrated current transformer and fault detection method.
Background
The current transformer can be used for taking the voltage of the primary line and then supplying the voltage to the secondary line, and collecting the voltage signal of the primary line for fault detection. Currently, when designing a current transformer, the following methods are generally adopted: and the separated design is that the electricity taking current transformer and the sampling current transformer are respectively installed, or the sampling coil and the electricity taking coil are wound on the same magnetic ring. Then, the external active equipment can perform fault detection on the voltage signals collected by the current transformer through a fault tree algorithm.
However, the inventors found that when the current transformer is designed in the above manner, there are often the following technical problems:
Firstly, the split design requires different connection circuits for the power-taking current transformer and the sampling current transformer, so that the applicability of the current transformer is reduced;
secondly, when the sampling coil and the electricity taking coil are connected on the same magnetic ring, magnetic fluxes of the sampling coil and the electricity taking coil can be mutually offset, so that the precision of the sampling coil and the electricity taking coil is reduced, and the precision of the current transformer is reduced;
Third, when fault detection is performed by the fault tree algorithm, only preset fault mode information can be identified, and it is difficult to identify a partial circuit fault, so that the accuracy of fault detection is reduced.
The above information disclosed in this background section is only for enhancement of understanding of the background of the inventive concept and, therefore, may contain information that does not form the prior art that is already known to those of ordinary skill in the art in this country.
Disclosure of Invention
The disclosure is in part intended to introduce concepts in a simplified form that are further described below in the detailed description. The disclosure is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter.
Some embodiments of the present disclosure propose an integrated current transformer and fault detection method to address one or more of the technical problems mentioned in the background section above.
In a first aspect, some embodiments of the present disclosure provide an integrated current transformer comprising: insulating housing, current transformer module, cable conductor and aviation plug, wherein: the insulating shell is arranged outside the current transformer module; the current transformer module is in power supply connection with an external circuit, and is used for collecting voltage sampling signals of the external circuit and collecting electric energy from the external circuit; the current transformer module is connected with the aviation plug through the cable circuit, wherein the cable is used for sending a voltage sampling signal and electric energy acquired by the current transformer module to the aviation plug; the aviation plug is in power supply connection with external active equipment, wherein the aviation plug is used for sending voltage sampling signals and electric energy of an external circuit acquired by the current transformer module to the external active equipment so as to supply power for the external active equipment.
Optionally, the current transformer module includes: the current sampling mutual inductor and current get electric mutual inductor, above-mentioned current gets electric mutual inductor includes: the electric magnetic loop is got to electric current and electric wire is got to electric current, and above-mentioned current sampling mutual-inductor includes: current sampling magnetic ring and current sampling coil, wherein: the current transformer module comprises a current sampling transformer and a current taking transformer which are fixedly connected; the current transformer module comprises a current electricity taking transformer and is in power supply connection with the external circuit through the cable and the aviation plug, wherein the current electricity taking transformer is used for collecting electric energy from the external circuit, and the current electricity taking transformer comprises a current electricity taking coil which is used for outputting the collected electric energy to the cable; the current transformer module comprises a current sampling transformer, the current sampling transformer is connected with the external circuit through the cable wire and the aviation plug in a power supply manner, wherein the current sampling transformer is used for collecting voltage sampling signals of the external circuit, and a current sampling coil comprising the current sampling transformer is used for outputting the collected voltage sampling signals to the cable wire.
Optionally, the current transformer further includes: get electric positive pole output pin and get electric negative pole output pin, above-mentioned cable conductor includes: get electric positive pole signal line and get electric negative pole signal line, wherein: the current electricity taking transformer comprises an electricity taking positive electrode output pin which is in power supply connection with an electricity taking positive electrode signal wire comprising the cable; the current gets electric transformer includes get electric negative pole output pin and get electric negative pole signal line power supply connection that above-mentioned cable conductor included, wherein, get electric positive pole signal line and get electric negative pole signal line that above-mentioned cable conductor included, be used for getting electric energy from above-mentioned current gets electric transformer including, get electric positive pole output pin and get electric negative pole output pin.
Optionally, the current sampling transformer further includes: sampling positive pole output pin and sampling negative pole output pin, above-mentioned cable conductor still includes: a sampling positive electrode signal line and a sampling negative electrode signal line, wherein: the current sampling transformer comprises a sampling positive electrode output pin which is in power supply connection with a sampling positive electrode signal wire comprising the cable; the sampling negative electrode output pin of the current sampling transformer is in power supply connection with the sampling negative electrode signal line of the cable, wherein the sampling positive electrode signal line and the sampling negative electrode signal line of the cable are used for acquiring voltage sampling signals from the sampling positive electrode output pin and the sampling negative electrode output pin of the current sampling transformer.
Optionally, the aviation plug includes: get electric positive pole pin and get electric negative pole pin, wherein: the power-taking anode signal wire included in the cable is in power supply connection with the power-taking anode pin included in the aviation plug; the power-taking negative electrode signal wire included by the cable is in power supply connection with the power-taking negative electrode pin included by the aviation plug, wherein the power-taking positive electrode pin and the power-taking negative electrode pin included by the aviation plug are used for acquiring the electric energy from the power-taking positive electrode signal wire and the power-taking negative electrode signal wire included by the cable.
Optionally, the aviation plug further includes: sampling positive pole pin and sampling negative pole pin, wherein: the sampling positive electrode signal wire included in the cable line is in power supply connection with the sampling positive electrode pin included in the aviation plug; the sampling negative electrode signal line that above-mentioned cable conductor included is connected with the sampling negative electrode pin power supply that above-mentioned aviation plug included, and wherein, the positive electrode pin of sampling that above-mentioned aviation plug included and sampling negative electrode pin are used for obtaining above-mentioned voltage sampling signal from the positive electrode signal line of sampling and the sampling negative electrode signal line that above-mentioned cable conductor included.
Optionally, the aviation plug further includes: from the detection signal pin, above-mentioned cable conductor still includes: the self-detection signal line, the above-mentioned external active device includes: a detection circuit, wherein: the self-detection signal wire included by the cable line is in communication connection with the detection circuit included by the external active device through the self-detection signal pin included by the aviation plug, wherein the self-detection signal wire included by the cable line is used for collecting detection signals from the mutual inductor module.
In a second aspect, some embodiments of the present disclosure provide a fault detection method, the fault detection method comprising: acquiring electric energy and voltage sampling signals in response to receiving the detection signals; in response to receiving the electric energy, filtering the voltage sampling signal to obtain a voltage filtering signal; performing feature extraction processing on the voltage filtering signals to obtain voltage fault feature signals; detecting the voltage fault characteristic signal based on a preset sample fault characteristic signal to obtain a detection result; and executing alarm operation in response to determining that the detection result meets the preset abnormal condition.
The above embodiments of the present disclosure have the following advantageous effects: an integrated current transformer by some embodiments of the present disclosure includes: insulating housing, current transformer module, cable conductor and aviation plug, wherein: the insulating shell is arranged outside the current transformer module; the current transformer module is in power supply connection with an external circuit, and is used for collecting voltage sampling signals of the external circuit and collecting electric energy from the external circuit; the current transformer module is connected with the aviation plug through the cable circuit, wherein the cable is used for sending a voltage sampling signal and electric energy acquired by the current transformer module to the aviation plug; the aviation plug is in power supply connection with external active equipment, wherein the aviation plug is used for sending voltage sampling signals and electric energy of an external circuit acquired by the current transformer module to the external active equipment. Therefore, the integrated current transformer can be used for arranging the current sampling transformer and the current taking transformer in the same module, so that electric energy and voltage sampling signals can be sent to external equipment only through the same cable, and the applicability of the current transformer can be improved.
Drawings
The above and other features, advantages, and aspects of embodiments of the present disclosure will become more apparent by reference to the following detailed description when taken in conjunction with the accompanying drawings. The same or similar reference numbers will be used throughout the drawings to refer to the same or like elements. It should be understood that the figures are schematic and that elements and components are not necessarily drawn to scale.
Fig. 1 is a schematic structural view of some embodiments of an integrated current transformer according to the present disclosure;
fig. 2 is a schematic structural view of a current transformer module of the integrated current transformer according to the present disclosure;
fig. 3 is a schematic diagram of a current transformer module of an integrated current transformer according to the present disclosure;
fig. 4 is a schematic structural view of other embodiments of an integrated current transformer according to the present disclosure;
fig. 5 is a flow chart of some embodiments of a fault detection method according to the present disclosure.
Detailed Description
Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. It should be understood that the drawings and embodiments of the present disclosure are for illustration purposes only and are not intended to limit the scope of the present disclosure.
It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings. Embodiments of the present disclosure and features of embodiments may be combined with each other without conflict.
It should be noted that the terms "first," "second," and the like in this disclosure are merely used to distinguish between different devices, modules, or units and are not used to define an order or interdependence of functions performed by the devices, modules, or units.
It should be noted that references to "one", "a plurality" and "a plurality" in this disclosure are intended to be illustrative rather than limiting, and those of ordinary skill in the art will appreciate that "one or more" is intended to be understood as "one or more" unless the context clearly indicates otherwise.
The names of messages or information interacted between the various devices in the embodiments of the present disclosure are for illustrative purposes only and are not intended to limit the scope of such messages or information.
The present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Referring first to fig. 1, fig. 1 illustrates a schematic diagram of some embodiments of an integrated current transformer according to the present disclosure. As shown in fig. 1, the integrated current transformer includes: insulating housing 1, current transformer module 2, cable conductor 3 and aviation plug 4, wherein: the insulating housing 1 is mounted outside the current transformer module 2. The housing 1 may be used to isolate the current transformer module 2 from external wiring. The aerial plug 4 may be a knob type aerial plug.
In some embodiments, the current transformer module 2 is in electrical connection with an external line 5. The current transformer module 2 is used for collecting voltage sampling signals of the external circuit 5 and collecting electric energy from the external circuit 5. The external line 5 may be a high-voltage line. The voltage sample signal may be indicative of the voltage state of the external line 5.
As an example, the above voltage state may be, but is not limited to, at least one of: normal operation, short circuit or open circuit.
The above-described current transformer module 2 will be described next with reference to fig. 2 and 1. Fig. 2 is a schematic structural view of a current transformer module of the integrated current transformer according to the present disclosure. As shown in fig. 2, the current transformer module 2 includes: a current sampling transformer 22 and a current sampling transformer 21, the current sampling transformer 21 comprising: the current sampling transformer 22 includes: a current sampling magnetic loop 221 and a current sampling coil 222, wherein: the current transformer module 2 includes a current sampling transformer 22 and a current sampling transformer 21 which are fixedly connected. The current transformer module 2 includes a current transformer 21 electrically connected to the external line 5, wherein the current transformer 21 is configured to collect electrical energy from the external line 5, and the current transformer 21 includes a current transformer 212 configured to output the collected electrical energy to the cable 3. The current transformer module 2 includes a current sampling transformer 22 electrically connected to the external line 5, wherein the current sampling transformer 22 is configured to collect a voltage sampling signal of the external line 5, and the current sampling transformer 22 includes a current sampling coil 222 configured to output the collected voltage sampling signal to the cable line 3.
As an example, the above-described current transformer module 2 may refer to fig. 3, fig. 3 being a schematic diagram of a current transformer module of an integrated current transformer according to the present disclosure. As shown in fig. 3, the current sampling magnetic ring 221 may be the sampling magnetic ring shown in fig. 3. The current sampling magnetic loop 222 may be the sampling coil shown in fig. 3. The current-collecting electromagnetic ring 211 may be a current-collecting magnetic ring as shown in fig. 3. The current extraction coil 212 may be the extraction coil shown in fig. 3. The current sampling transformer 21 and the current sampling transformer 22 may be fixedly connected by resin potting. The external line 5 may pass through the current sampling transformer 21 and the current sampling transformer 22 to be electrically connected to the current sampling transformer 21 and the current sampling transformer 22.
The related design of the current transformer module is taken as an invention point of the embodiment of the disclosure, and solves the second technical problem of "the accuracy of the current transformer is reduced" in the background art. Factors that cause the accuracy of the current transformer to decrease are often as follows: when the sampling coil and the power taking coil are connected on the same magnetic ring, magnetic fluxes of the sampling coil and the power taking coil can cancel each other, and accuracy of the sampling coil and the power taking coil is reduced. If the above factors are solved, the accuracy of the current transformer can be improved. To achieve this effect, the present disclosure may design two magnetic rings and coils to achieve a sampling function and an electricity taking function, respectively, and then may connect the sampling coil and the electricity taking coil together by means of resin potting. Therefore, independent magnetic rings can be adopted, so that the influence of the power taking coil and the sampling coil on the magnetic flux of each other can be reduced, and the accuracy of the current transformer can be improved.
The current transformer module 2 is electrically connected to the aviation plug 4 via the cable 3. The cable 3 is configured to send the voltage sampling signal and the electric energy collected by the current transformer module 2 to the aviation plug 4.
The aviation plug 4 is in power supply connection with an external active device 6, wherein the aviation plug 4 is used for sending a voltage sampling signal and electric energy of an external line 5 collected by the current transformer module 2 to the external active device 6 so as to supply power for the external active device 6.
The integrated current transformer will be further described with reference to fig. 4 and 1. Fig. 4 is a schematic structural view of other embodiments of an integrated current transformer according to the present disclosure. As shown in fig. 4, the current transformer 21 further includes: get electric positive pole output pin 2121 and get electric negative pole output pin 2122, above-mentioned cable line 3 includes: a power-taking positive electrode signal line 31 and a power-taking negative electrode signal line 32. Wherein: the current transformer 21 includes a positive output pin 2121 for power supply and is connected to a positive signal line 31 for power supply, which is included in the cable 3. The current-collecting transformer 21 includes a collecting negative output pin 2122 electrically connected to the collecting negative signal line 32 included in the cable 3. Wherein, the cable 3 includes a positive signal line 31 and a negative signal line 32 for obtaining electric energy from a positive output pin 2121 and a negative output pin 2122 of the current transformer 21.
Optionally, the current sampling transformer 22 further includes: the sampling positive output pin 2221 and the sampling negative output pin 2222, and the above cable 3 further includes: a sampling positive signal line 33 and a sampling negative signal line 34. Wherein: the current sampling transformer 22 includes a sampling positive electrode output pin 2221 electrically connected to a sampling positive electrode signal line 33 included in the cable 3. The current sampling transformer 22 includes a sampling negative output pin 2222 electrically connected to a sampling negative signal line 34 included in the cable 3. The cable 3 includes a positive sampling signal line 33 and a negative sampling signal line 34, and is configured to obtain voltage sampling signals from a positive sampling output pin 2221 and a negative sampling output pin 2222 included in the current sampling transformer 22.
Optionally, the aviation plug 4 includes: a power-taking positive electrode pin 41 and a power-taking negative electrode pin 42. Wherein: the power-taking positive electrode signal wire 31 included in the cable 3 is in power supply connection with the power-taking positive electrode pin 41 included in the aviation plug 4. The power-taking negative electrode signal line 32 included in the cable 3 is in power supply connection with the power-taking negative electrode pin 42 included in the aviation plug 4. The aviation plug 4 includes a power-taking positive electrode pin 41 and a power-taking negative electrode pin 42, and is configured to obtain the electric energy from a power-taking positive electrode signal line 31 and a power-taking negative electrode signal line 32 included in the cable 3.
Optionally, the aviation plug 4 further includes: a sampling positive pin 43 and a sampling negative pin 44. Wherein: the sampling positive electrode signal line 33 included in the cable 3 is electrically connected to the sampling positive electrode pin 43 included in the aviation plug 4. The sampling negative electrode signal line 34 included in the cable 3 is electrically connected to the sampling negative electrode pin 44 included in the aviation plug 4. The aviation plug 4 includes a sampling positive electrode pin 43 and a sampling negative electrode pin 44, and is configured to obtain the voltage sampling signal from the sampling positive electrode signal line 33 and the sampling negative electrode signal line 34 included in the cable 3.
Optionally, the aviation plug 4 further includes: the self-detection signal pin 45, the cable 3 further includes: the self-detection signal line 35, the external active device 6 includes: a detection circuit 61. Wherein: the self-detection signal line 35 included in the cable 3 is communicatively connected to the detection circuit 61 included in the external active device 6 via the self-detection signal pin 45 included in the aviation plug 4. Wherein, the cable 3 includes a self-detection signal line 35 for collecting detection signals from the transformer module 2. Wherein the detection signal may be indicative of successful connection of the external device 6 with the integrated current transformer.
As an example, the external active device 6 may be a device for performing circuit fault detection on a primary line on which current sampling is performed by the integrated current transformer, and then alarming.
In practice, the external active device 6 described above may be configured to perform the following steps:
In a first step, power and voltage sampling signals are obtained in response to receiving the detection signal. Wherein the electrical energy and voltage sampling signals are obtained from the current transformer module through the aviation plug and the electrical cable in response to receiving detection signals from the aviation plug and the electrical cable. Wherein the electrical energy may power the external active device. The voltage sampling signal may be indicative of the voltage state of the external line.
As an example, the above voltage state may be, but is not limited to, at least one of: normal operation, short circuit or open circuit.
And secondly, responding to the received electric energy, and filtering the voltage sampling signal to obtain a voltage filtering signal. The voltage sampling signal can be subjected to filtering processing through a preset filtering algorithm, so that a voltage filtering signal is obtained.
As an example, the above-mentioned preset filtering algorithm may be a wavelet transform algorithm.
And thirdly, performing feature extraction processing on the voltage filtering signals to obtain voltage fault feature signals. The voltage filtering signal can be subjected to feature extraction processing through a preset feature extraction algorithm, so that a voltage fault feature signal is obtained.
As an example, the above-mentioned preset feature extraction algorithm may be Karenbauer (clenbuter) transform algorithm.
Fourth, based on the preset sample fault characteristic signals, detecting the voltage fault characteristic signals to obtain detection results. The voltage fault characteristic signal can be detected through a preset detection algorithm, and a detection result is obtained. The predetermined sample fault signature may characterize the voltage signal of the faulty external line.
As an example, the above-mentioned preset detection algorithm may include, but is not limited to, at least one of: CNN (Convolutional Neural Networks, convolutional neural network) model algorithms and fuzzy matching algorithms.
And fifthly, executing alarm operation in response to determining that the detection result meets the preset abnormal condition. The preset abnormal condition may be that the detection result is information indicating that a fault occurs. The alarm operation may be to display warning text or to give out warning sound.
The fault detection method is taken as an invention point of the embodiment of the disclosure, and solves the technical problem three of 'the reduction of the accuracy of fault detection' in the background art. Factors that cause the accuracy of fault detection to decrease tend to be as follows: when fault detection is performed by the fault tree algorithm, only preset fault mode information can be identified, and partial circuit faults are difficult to identify. If the above factors are solved, the accuracy of fault detection can be improved. To achieve this, the present disclosure includes an external active device that may first obtain power and voltage sampling signals in response to receiving a detection signal. Thus, the external active device can start to operate and initiate a failure detection mode. And secondly, responding to the received electric energy, and performing filtering processing on the voltage sampling signal to obtain a voltage filtering signal. Thus, noise signals in the voltage sampling signals can be removed, so that the accuracy of fault detection is improved. And then, carrying out feature extraction processing on the voltage filtering signals to obtain voltage fault feature signals. Thus, a characteristic signal which can characterize the characteristic state of the external line voltage can be obtained for fault detection. And then, detecting the voltage fault characteristic signal based on a preset sample fault characteristic signal to obtain a detection result. Thus, it is possible to determine whether the current line is faulty by comparing the sampled voltage signal of the faulty circuit with the current voltage signal. And finally, executing alarm operation in response to determining that the detection result meets the preset abnormal condition. Thereby, a line that has failed can be alerted. Therefore, the external active equipment can perform feature extraction on various fault signals to obtain fault feature information, and then determine whether the current line has faults or not by comparing the current collected voltage signals with the fault signals, so that partial circuit faults can be identified, and further, the accuracy of fault detection can be improved.
The above embodiments of the present disclosure have the following advantageous effects: an integrated current transformer by some embodiments of the present disclosure includes: insulating housing, current transformer module, cable conductor and aviation plug, wherein: the insulating shell is arranged outside the current transformer module; the current transformer module is in power supply connection with an external circuit, and is used for collecting voltage sampling signals of the external circuit and collecting electric energy from the external circuit; the current transformer module is connected with the aviation plug through the cable circuit, wherein the cable is used for sending a voltage sampling signal and electric energy acquired by the current transformer module to the aviation plug; the aviation plug is in power supply connection with external active equipment, wherein the aviation plug is used for sending voltage sampling signals and electric energy of an external circuit acquired by the current transformer module to the external active equipment. Therefore, the integrated current transformer can be used for arranging the current sampling transformer and the current taking transformer in the same module, so that electric energy and voltage sampling signals can be sent to external equipment only through the same cable, and the applicability of the current transformer can be improved.
Referring next to fig. 5, the present disclosure also provides a fault detection method for the integrated current transformer of the above embodiments, as shown in fig. 5, which illustrates a flowchart 500 of some embodiments of the fault detection method of the present disclosure. The fault detection method may include the steps of:
in step 501, power and voltage sampling signals are obtained in response to receiving the detection signal.
In some embodiments, the external active device may obtain power and voltage sampling signals from the current transformer module through the aerial plug and the electrical cord in response to receiving detection signals from the aerial plug and the electrical cord. Wherein the electrical energy may power the external active device. The voltage sampling signal may be indicative of the voltage state of the external line.
As an example, the above voltage state may be, but is not limited to, at least one of: normal operation, short circuit or open circuit.
Step 502, in response to receiving the electrical energy, performing filtering processing on the voltage sampling signal to obtain a voltage filtering signal.
In some embodiments, the external active device may perform a filtering process on the voltage sampling signal in response to receiving the power to obtain a voltage filtered signal. The voltage sampling signal can be subjected to filtering processing through a preset filtering algorithm, so that a voltage filtering signal is obtained.
As an example, the above-mentioned preset filtering algorithm may be a wavelet transform algorithm.
Step 503, performing feature extraction processing on the voltage filtering signal to obtain a voltage fault feature signal.
In some embodiments, the external active device may perform feature extraction processing on the voltage filtered signal to obtain a voltage fault feature signal. The voltage filtering signal can be subjected to feature extraction processing through a preset feature extraction algorithm, so that a voltage fault feature signal is obtained.
As an example, the above-mentioned preset feature extraction algorithm may be Karenbauer (clenbuter) transform algorithm.
Step 504, detecting the voltage fault characteristic signal based on a preset sample fault characteristic signal to obtain a detection result.
In some embodiments, the external active device may perform detection processing on the voltage fault signature based on a preset sample fault signature to obtain a detection result.
In some optional implementations of some embodiments, the detecting, by the external active device, the voltage fault signature based on a preset sample fault signature to obtain a detection result may include the following steps:
The first step, respectively carrying out normalization processing on a preset sample fault characteristic signal and the voltage fault characteristic signal to obtain a sample fault normalization signal and a voltage fault normalization signal. The method comprises the steps of respectively carrying out normalization processing on a preset sample fault characteristic signal and the voltage fault characteristic signal through a preset normalization function to obtain a sample fault normalization signal and a voltage fault normalization signal.
As an example, the above-mentioned preset normalization function may be a sigmoid (normalization) function.
And secondly, respectively carrying out convolution processing on the sample fault normalization signal and the voltage fault normalization signal to obtain a sample fault convolution signal and a voltage fault convolution signal. The sample fault normalization signal and the voltage fault normalization signal can be subjected to convolution processing respectively through a preset convolution algorithm, so that a sample fault convolution signal and a voltage fault convolution signal are obtained.
As an example, the above-mentioned preset convolution algorithm may be a CNN (Convolutional Neural Networks, convolutional neural network) model algorithm.
And thirdly, determining a fault similarity coefficient value of the sample fault convolution signal and the voltage fault convolution signal. The fault similarity coefficient values of the sample fault convolution signal and the voltage fault convolution signal can be determined through a preset distance similarity algorithm.
As an example, the above-mentioned preset distance similarity algorithm may be, but is not limited to, at least one of the following: euclidean distance algorithm, mahalanobis distance algorithm, or Manhattan distance algorithm.
And step four, in response to determining that the fault similarity coefficient value is greater than or equal to a preset threshold value, determining the first preset detection information as a detection result.
As an example, the above-mentioned preset threshold value may be 0.8. The first preset detection information may be information indicating "failure".
Optionally, the external active device may further determine second preset detection information as a detection result in response to determining that the fault similarity coefficient value is smaller than the preset threshold.
As an example, the second preset detection information may be information characterizing "no failure".
In some optional implementations of some embodiments, the predetermined sample fault signature may be generated by:
first, a sample voltage fault signal set is obtained. The sample voltage fault signal set can be obtained from the terminal equipment in a wired or wireless connection mode. Each of the sample voltage fault signals in the set of sample voltage fault signals may be a voltage signal of a circuit line at the time of a fault.
And secondly, carrying out feature extraction processing on each sample voltage fault signal in the sample voltage fault signal set to generate an initial voltage fault feature signal, and obtaining an initial voltage fault feature signal set. And performing feature extraction processing on each sample voltage fault signal in the sample voltage fault signal set through the preset feature extraction algorithm to generate an initial voltage fault feature signal, so as to obtain an initial voltage fault feature signal set.
And thirdly, clustering the initial voltage fault characteristic signal set to obtain an initial fault characteristic signal cluster and an initial fault characteristic cluster central value set. The initial fault characteristic signal clusters in the initial fault characteristic signal cluster set are in one-to-one correspondence with initial fault characteristic cluster central values in the initial fault characteristic cluster central value set. And clustering the initial voltage fault characteristic signal set through a preset clustering algorithm to obtain an initial fault characteristic signal cluster and an initial fault characteristic cluster central value set.
As an example, the above-mentioned preset clustering algorithm may be a fuzzy clustering algorithm.
And step four, determining the initial fault feature cluster central value smaller than a preset central threshold value in the initial fault feature cluster central value set as a target fault feature cluster central value, and obtaining a target fault feature cluster central value set. Wherein, the preset central threshold value can be determined by the following steps: firstly, the central values of the initial fault feature clusters in the initial fault feature cluster central value set can be sequenced from small to large to obtain an initial fault feature cluster central value sequence. Then, the product of the number of the initial fault feature cluster center values in the initial fault feature cluster center value sequence and the preset ratio value can be determined to be an initial selection number. Then, the initial selection number may be rounded to obtain a target selection number. Here, the initial selection number may be rounded by a preset rounding function, so as to obtain the target selection number. And finally, determining the initial fault feature cluster central values of the first target selected number in the initial fault feature cluster central value sequence as the preset central threshold value.
As an example, the above-mentioned preset ratio value may be 0.8. The preset rounding function may be, but is not limited to, at least one of the following: ceil function, floor function, or round function.
And fifthly, deleting the initial fault characteristic signal cluster set, the initial fault characteristic signal cluster corresponding to each target fault characteristic cluster central value in the target fault characteristic cluster central value set from the initial fault characteristic signal cluster set to obtain a target initial fault characteristic signal cluster set.
And sixthly, accumulating the target initial fault characteristic signals in the target initial fault characteristic signal cluster set to obtain the sample fault characteristic signals. The method comprises the steps of carrying out accumulation processing on each target initial fault characteristic signal in the target initial fault characteristic signal cluster set through a preset accumulation algorithm to obtain the sample fault characteristic signal.
As an example, the above-described preset accumulation algorithm may be a cut (accumulation) function algorithm.
Thus, the fault signature may be extracted from each sample fault signal by collecting each sample fault signal. Then, the characteristic information of the fault characteristic signal and the current voltage signal can be further extracted through convolution operation, so that the accuracy of fault detection is improved. Finally, the fault characteristic signal after convolution and the current voltage signal can be matched to obtain a detection result. Therefore, the accuracy of fault characteristic information can be improved, and further, the accuracy of fault detection can be improved.
In step 505, in response to determining that the detection result satisfies a preset abnormal condition, an alarm operation is performed.
In some embodiments, the executing body may execute the alarm operation in response to determining that the detection result satisfies a preset abnormal condition. The preset abnormal condition may be that the detection result is information indicating that a fault occurs. The alarm operation may be to display warning text or to give out warning sound.
The fault detection method is taken as an invention point of the embodiment of the disclosure, and solves the technical problem three of 'the reduction of the accuracy of fault detection' in the background art. Factors that cause the accuracy of fault detection to decrease tend to be as follows: when fault detection is performed by the fault tree algorithm, only preset fault mode information can be identified, and partial circuit faults are difficult to identify. If the above factors are solved, the accuracy of fault detection can be improved. To achieve this, the present disclosure includes an external active device that may first obtain power and voltage sampling signals in response to receiving a detection signal. Thus, the external active device can start to operate and initiate a failure detection mode. And secondly, responding to the received electric energy, and performing filtering processing on the voltage sampling signal to obtain a voltage filtering signal. Thus, noise signals in the voltage sampling signals can be removed, so that the accuracy of fault detection is improved. And then, carrying out feature extraction processing on the voltage filtering signals to obtain voltage fault feature signals. Thus, a characteristic signal which can characterize the characteristic state of the external line voltage can be obtained for fault detection. And then, detecting the voltage fault characteristic signal based on a preset sample fault characteristic signal to obtain a detection result. Thus, it is possible to determine whether the current line is faulty by comparing the sampled voltage signal of the faulty circuit with the current voltage signal. And finally, executing alarm operation in response to determining that the detection result meets the preset abnormal condition. Thereby, a line that has failed can be alerted. Therefore, the external active equipment can perform feature extraction on various fault signals to obtain fault feature information, and then determine whether the current line has faults or not by comparing the current collected voltage signals with the fault signals, so that partial circuit faults can be identified, and further, the accuracy of fault detection can be improved.
The foregoing description is only of the preferred embodiments of the present disclosure and description of the principles of the technology being employed. It will be appreciated by those skilled in the art that the scope of the invention in the embodiments of the present disclosure is not limited to the specific combination of the above technical features, but encompasses other technical features formed by any combination of the above technical features or their equivalents without departing from the spirit of the invention. Such as the above-described features, are mutually substituted with (but not limited to) the features having similar functions disclosed in the embodiments of the present disclosure.

Claims (7)

1. An integrated current transformer comprising: insulating housing, current transformer module, cable conductor and aviation plug, wherein:
the insulating shell is arranged outside the current transformer module;
The current transformer module is in power supply connection with an external circuit, and is used for collecting voltage sampling signals of the external circuit and collecting electric energy from the external circuit;
The current transformer module is connected with the aviation plug through the cable circuit, wherein the cable is used for sending a voltage sampling signal and electric energy acquired by the current transformer module to the aviation plug;
The aviation plug is in power supply connection with external active equipment, and is used for sending voltage sampling signals and electric energy of an external circuit acquired by the current transformer module to the external active equipment;
The current transformer module is characterized by comprising: the current sampling transformer and current get electric transformer, the current gets electric transformer includes: the electric magnetic loop is got to electric current and electric wire is got to electric current, the current sampling mutual-inductor includes: current sampling magnetic ring and current sampling coil, wherein:
the current transformer module comprises a current sampling transformer and a current taking transformer which are fixedly connected;
the current transformer module comprises a current power taking transformer which is in power supply connection with the external circuit, wherein the current power taking transformer is used for collecting electric energy from the external circuit, and the current power taking transformer comprises a current power taking coil which is used for outputting the collected electric energy to the cable;
The current transformer module comprises a current sampling transformer which is in power supply connection with the external line, wherein the current sampling transformer is used for collecting voltage sampling signals of the external line, and the current sampling transformer comprises a current sampling coil which is used for outputting the collected voltage sampling signals to the cable line;
The current transformer further comprises: get electric anodal output pin and get electric negative pole output pin, the cable conductor includes: get electric positive pole signal line and get electric negative pole signal line, wherein:
The current electricity taking transformer comprises an electricity taking positive electrode output pin which is in power supply connection with an electricity taking positive electrode signal wire comprising the cable;
The current electricity taking transformer comprises an electricity taking negative electrode output pin which is in power supply connection with an electricity taking negative electrode signal wire which is arranged on the cable, wherein the electricity taking positive electrode signal wire and the electricity taking negative electrode signal wire which are arranged on the cable are used for acquiring electric energy from the electricity taking positive electrode output pin and the electricity taking negative electrode output pin which are arranged on the current electricity taking transformer;
the current sampling transformer further comprises: sampling positive pole output pin and sampling negative pole output pin, the cable conductor still includes: a sampling positive electrode signal line and a sampling negative electrode signal line, wherein:
the current sampling transformer comprises a sampling positive electrode output pin which is in power supply connection with a sampling positive electrode signal wire comprising the cable;
The current sampling transformer comprises a sampling negative electrode output pin and a sampling negative electrode signal wire, wherein the sampling negative electrode output pin is in power supply connection with the sampling negative electrode signal wire, the sampling positive electrode signal wire and the sampling negative electrode signal wire are used for acquiring voltage sampling signals from the sampling positive electrode output pin and the sampling negative electrode output pin.
2. The integrated current transformer of claim 1, wherein the aerial plug comprises: get electric positive pole pin and get electric negative pole pin, wherein:
The power-taking positive electrode signal wire included in the cable is in power supply connection with the power-taking positive electrode pin included in the aviation plug;
The power-taking negative electrode signal line included by the cable is in power supply connection with the power-taking negative electrode pin included by the aviation plug, wherein the power-taking positive electrode pin and the power-taking negative electrode pin included by the aviation plug are used for acquiring the electric energy from the power-taking positive electrode signal line and the power-taking negative electrode signal line included by the cable.
3. The integrated current transformer of claim 2, wherein the aerial plug further comprises: sampling positive pole pin and sampling negative pole pin, wherein:
The sampling positive electrode signal wire included in the cable line is in power supply connection with the sampling positive electrode pin included in the aviation plug;
The sampling negative electrode signal line that the cable conductor included with the sampling negative electrode pin power supply that aviation plug included is connected, wherein, the sampling positive electrode pin that aviation plug included and sampling negative electrode pin are used for follow on sampling positive electrode signal line and the sampling negative electrode signal line that the cable conductor included acquire the voltage sampling signal.
4. The integrated current transformer of claim 3, wherein the aerial plug further comprises: from detecting signal pin, the cable conductor still includes: a self-detection signal line, the external active device comprising: a detection circuit, wherein:
The self-detection signal wire included by the cable wire is in communication connection with the detection circuit included by the external active device through the self-detection signal pin included by the aviation plug, wherein the self-detection signal wire included by the cable wire is used for collecting detection signals from the transformer module, and sending the detection signals to the detection circuit included by the external active device through the aviation plug.
5. A fault detection method applied to the integrated current transformer as claimed in any one of claims 1 to 4, comprising:
acquiring electric energy and voltage sampling signals in response to receiving the detection signals;
in response to receiving the electric energy, filtering the voltage sampling signal to obtain a voltage filtering signal;
Performing feature extraction processing on the voltage filtering signals to obtain voltage fault feature signals;
detecting the voltage fault characteristic signal based on a preset sample fault characteristic signal to obtain a detection result;
And executing alarm operation in response to determining that the detection result meets a preset abnormal condition.
6. The method of claim 5, wherein the detecting the voltage fault signature based on the preset sample fault signature to obtain a detection result includes:
respectively carrying out normalization processing on the preset sample fault characteristic signals and the voltage fault characteristic signals to obtain sample fault normalization signals and voltage fault normalization signals;
Respectively carrying out convolution processing on the sample fault normalization signal and the voltage fault normalization signal to obtain a sample fault convolution signal and a voltage fault convolution signal;
Determining a fault similarity coefficient value for the sample fault convolution signal and the voltage fault convolution signal;
and in response to determining that the fault similarity coefficient value is greater than or equal to a preset threshold, determining first preset detection information as a detection result.
7. The method of claim 6, wherein the method further comprises:
And in response to determining that the fault similarity coefficient value is smaller than the preset threshold, determining second preset detection information as a detection result.
CN202311125918.4A 2023-09-01 2023-09-01 Integrated current transformer and fault detection method Active CN117373807B (en)

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CN111025107A (en) * 2019-12-31 2020-04-17 威胜集团有限公司 Fault arc detection circuit and device and working condition detection method
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CN203479952U (en) * 2013-10-12 2014-03-12 长沙威胜信息技术有限公司 Cable type fault detector
CN104659581A (en) * 2013-11-18 2015-05-27 西安丁子电子信息科技有限公司 Power supply board plug with electric meter
CN203773007U (en) * 2014-04-16 2014-08-13 广西云涌科技有限公司 Overhead fault indicator for double current transformers
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