CN110893400A - Sorting and receiving device for partial discharge signals of switch cabinet - Google Patents
Sorting and receiving device for partial discharge signals of switch cabinet Download PDFInfo
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- CN110893400A CN110893400A CN201911349906.3A CN201911349906A CN110893400A CN 110893400 A CN110893400 A CN 110893400A CN 201911349906 A CN201911349906 A CN 201911349906A CN 110893400 A CN110893400 A CN 110893400A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/34—Sorting according to other particular properties
- B07C5/344—Sorting according to other particular properties according to electric or electromagnetic properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/36—Sorting apparatus characterised by the means used for distribution
- B07C5/361—Processing or control devices therefor, e.g. escort memory
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Abstract
The application discloses signal's letter sorting receiving arrangement is put in cubical switchboard office includes: the filter circuit is used for receiving the partial discharge signal and filtering; the frequency selection circuit is connected with the filter circuit and comprises M variable inductors; m is a positive integer; the ultrasonic wave generating circuit is connected with the frequency selecting circuit and used for transmitting signals; receiving means for receiving an output signal of the ultrasonic wave generating circuit; and the M inductance value adjusting units are respectively connected with the M variable inductors and used for adjusting the inductance values of the connected variable inductors according to the control signals. By applying the scheme of the application, the frequency selection of the frequency selection circuit can be conveniently adjusted, so that a proper sorting effect is achieved, various complex scenes are met, and more accurate signal analysis and processing can be performed subsequently.
Description
Technical Field
The invention relates to the technical field of signal processing, in particular to a sorting and receiving device for partial discharge signals of a switch cabinet.
Background
In an insulation system of an electrical apparatus, the electric field intensity of each part is often unequal, when the electric field intensity of a local area reaches the breakdown field intensity of the dielectric of the area, a discharge occurs in the area, but the discharge does not penetrate between two conductors applying voltage, namely the whole insulation system does not break down, and the insulation performance is still maintained, and the phenomenon is called partial discharge.
Partial discharge is a ubiquitous problem in insulation, and under certain conditions, the partial discharge can cause the reduction of insulation performance, even cause serious conditions such as fire and the like, and threaten the safe operation of a system.
When detecting the partial discharge signal, the signal within a certain frequency range is filtered by the filter circuit, and then the subsequent signal analysis is performed, however, noise interference may still exist in the signal within the filtered frequency range, which is not favorable for performing accurate signal analysis.
In summary, how to more effectively ensure the accuracy of the signal analysis processing result is a technical problem that needs to be solved urgently by those skilled in the art.
Disclosure of Invention
The invention aims to provide a sorting and receiving device for partial discharge signals of a switch cabinet, so as to effectively guarantee the accuracy of signal analysis and processing results.
In order to solve the technical problems, the invention provides the following technical scheme:
a sorting receiving arrangement of signal is put in cubical switchboard office, includes:
the filter circuit is used for receiving the partial discharge signal and filtering;
the frequency selection circuit is connected with the filter circuit and comprises M variable inductors; m is a positive integer;
the ultrasonic generating circuit is connected with the frequency selecting circuit and used for transmitting signals;
receiving means for receiving an output signal of the ultrasonic wave generating circuit;
and the M inductance value adjusting units are respectively connected with the M variable inductors and used for adjusting the inductance values of the connected variable inductors according to control signals.
Preferably, the receiving apparatus includes:
a magnetostrictive device for receiving an output signal of the ultrasonic wave generation circuit based on magnetostriction;
and the signal analysis device is connected with the magnetostrictive device and is used for determining the frequency of the received signal and carrying out signal analysis.
Preferably, the frequency selection circuit includes:
the first end of the first resistor is connected with the first end of the first resistor and is used as the input end of the frequency selection circuit, and the second end of the first resistor is connected with the second end of the first inductor and is used as the first capacitor of the output end of the frequency selection circuit;
the first resistor;
the first inductor is connected with the second end of the first resistor at a first end, and the first inductor is a variable inductor.
Preferably, the filter circuit includes:
the low-pass filter circuit is used for receiving the partial discharge signal;
and the high-pass filter circuit is respectively connected with the low-pass filter circuit and the frequency selection circuit.
Preferably, the method further comprises the following steps:
and the analog signal isolation circuit is arranged between the frequency selection circuit and the ultrasonic wave generation circuit.
Preferably, the inductance value adjusting unit includes: the controller, the driving motor, the gear and the rack;
the variable inductor connected to the inductance value adjusting unit includes: the iron core is fixedly connected with the rack; a fixed position inductor coil;
the controller is used for adjusting the rotation direction of the driving motor according to a control signal; the gear is fixedly sleeved on an output shaft of the driving motor, and the rack is in meshing transmission with the gear.
Preferably, the magnetostrictive device comprises: the magnetic control device comprises a magnetostrictive wire, a hollow solenoid and a magnet fixed with the hollow solenoid in position;
the magnetostrictive wire is used for receiving an output signal of the ultrasonic wave generating circuit and is arranged in the hollow solenoid.
Preferably, the signal analysis device is based on
The frequency of the received signal is determined, wherein,
e is the induced electromotive force of the coil winding of the hollow solenoid, f is the frequency of the signal received by the receiving means, D1Is the effective diameter of the coil winding of the air core solenoid, D2The diameter of the magnetostrictive wire, N the number of turns of the coil winding of the hollow solenoid, I the current through the coil winding of the hollow solenoid, and L the length of the hollow solenoid.
In the solution of the present application, a frequency selection circuit connected to the filter circuit is provided to sort the partial discharge signals, considering that there may still be noise interference in the signals within the filtered frequency range. For the frequency range after filtering, in practical application, the frequency of the partial discharge signal in different scenes and at different times may be changed, and therefore, in order to realize proper partial discharge signal sorting, the frequency selection circuit in the application includes M variable inductors. M inductance value regulating unit is connected with M variable inductance respectively, can adjust the inductance value of the variable inductance that is connected according to control signal, promptly through M inductance value regulating unit, the scheme of this application can conveniently adjust the frequency selection of frequency selection circuit to reach suitable letter sorting effect, satisfy various complicated scenes, just also be favorable to the follow-up more accurate signal analysis processing that carries on.
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, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a sorting and receiving device for partial discharge signals of a switch cabinet according to the present invention;
FIG. 2 is a schematic circuit diagram of a filter circuit and a frequency selection circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a magnetostrictive device in accordance with an embodiment of the invention;
fig. 4 is a schematic structural diagram of an inductance value adjusting unit according to an embodiment of the invention;
FIG. 5 is a schematic circuit diagram of an analog signal isolation circuit according to an embodiment of the present invention;
fig. 6 is a circuit diagram of a controller in an inductance value adjusting unit according to an embodiment of the invention.
Detailed Description
The key point of the invention is to provide a sorting and receiving device for partial discharge signals of a switch cabinet, which can conveniently adjust the frequency selection of a frequency selection circuit, thereby achieving the proper sorting effect, meeting various complex scenes and being beneficial to more accurate signal analysis and processing in the follow-up process.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the 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.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a sorting and receiving apparatus for partial discharge signals of a switch cabinet in the present invention, the sorting and receiving apparatus includes:
and the filter circuit 10 is used for receiving the partial discharge signal and filtering the partial discharge signal.
The specific circuit configuration of the filter circuit 10 can be set and adjusted according to actual needs, for example, in a specific embodiment of fig. 2, the filter circuit 10 is a second-order active filter circuit, and the scheme is simple and convenient. Specifically, the filter circuit 10 may include: the low-pass filter circuit is used for receiving the partial discharge signal; and a high-pass filter circuit connected to the low-pass filter circuit and the frequency selecting circuit 20, respectively. Of course, in other scenarios, the filter circuit 10 may be adaptively adjusted according to actual needs, without affecting the implementation of the present invention.
The frequency selection circuit 20 is connected with the filter circuit 10, and the frequency selection circuit 20 comprises M variable inductors; m is a positive integer.
The specific circuit configuration of the frequency selecting circuit 20 may also be set and adjusted according to actual needs, but the frequency selecting circuit 20 at least includes 1 variable inductor, so that the scheme of the present application may adjust the frequency to be sorted by the frequency selecting circuit 20, thereby satisfying various complex scenarios. That is, the frequency to be sorted out by the frequency selecting circuit 20 conforms to the actual frequency of the current partial discharge signal, thereby ensuring the accuracy of subsequent signal analysis.
For example, in one embodiment of the present invention, referring to fig. 2, the frequency selection circuit 20 may include:
a first capacitor C1 having a first terminal connected to the first terminal of the first resistor R1 and serving as an input terminal of the frequency selection circuit 20, and a second terminal connected to the second terminal of the first inductor L1 and serving as an output terminal of the frequency selection circuit 20;
a first resistor R1;
the first inductor L1 has a first end connected to the second end of the first resistor R1, and the first inductor L1 is a variable inductor.
In this embodiment, the frequency selecting circuit 20 is an oscillator circuit including a first resistor R1, a first inductor L1, and a first capacitor C1. The circuit has simple structure and low cost. Since the first inductor L1 in the frequency selection circuit 20 is a variable inductor, the frequency selection of the signal can be performed by adjusting the inductance value of the first inductor L1.
And an ultrasonic wave generating circuit 30 connected to the frequency selecting circuit 20 for transmitting signals.
And a receiving device 40 for receiving an output signal of the ultrasonic wave generating circuit 30.
The ultrasonic wave generating circuit 30 can convert the received electric signal into an ultrasonic wave and transmit the ultrasonic wave, and the receiving device 40 can receive the ultrasonic wave signal output from the ultrasonic wave generating circuit 30.
The specific circuit configuration of the ultrasonic wave generating circuit 30 is adjusted according to actual needs, and compared with signal transmission based on an electric signal form, signal transmission is realized through ultrasonic signals, so that interference in the signal transmission process is reduced, and the accuracy of subsequent signal analysis results is further improved.
The receiving device 40 can receive the output signal of the ultrasonic wave generating circuit 30, and can normally display the signal waveform so that the staff can analyze the partial discharge signal. Of course, the relevant signal analyzing device may be connected to the receiving device 40, and the signal may be automatically analyzed. Furthermore, the correlation device for performing signal analysis may also be integrated into the receiving device 40, that is, the receiving device 40 itself may perform signal analysis, without affecting the implementation of the present invention.
The specific form of the receiving device 40 can be set and adjusted according to actual needs, and in a specific embodiment of the present invention, the signal receiving is realized based on the magnetostrictive principle, and the signal frequency sorted by the frequency selecting circuit 20 in the current state can be determined more accurately, so that the accurate analysis of the partial discharge signal is facilitated.
Specifically, in this embodiment, the receiving device 40 may include:
a magnetostrictive device for receiving an output signal of the ultrasonic wave generation circuit 30 based on magnetostriction;
and the signal analysis device is connected with the magnetostrictive device and is used for determining the frequency of the received signal and carrying out signal analysis.
In this embodiment, the receiving device 40 includes a magnetostrictive device and a signal analyzing device connected to the magnetostrictive device. The specific structure of the magnetostrictive device can be set as needed, the signal analyzer can analyze the signal, and the display device can generally display the relevant signal and the analysis result.
In one embodiment of the present invention, referring to fig. 3, a magnetostrictive device may comprise: a magnetostrictive wire 401, a hollow solenoid 402, and a magnet 403 fixed in position with the hollow solenoid. The magnetostrictive wire 401 is typically wrapped with an insulating layer.
The magnetostrictive wire 401 is used to receive an output signal of the ultrasonic wave generation circuit 30, and the magnetostrictive wire 401 is disposed inside the hollow solenoid 402.
Specifically, when the ultrasonic signal output by the ultrasonic generation circuit 30 acts on the magnetostrictive wire 401, the magnetostrictive wire 401 is caused to stretch, so that the internal magnetic field of the magnetostrictive wire 401 changes, the magnet generates a constant axial magnetic field, the internal magnetic field caused by the magnetostrictive wire 401 changes to generate electromagnetic induction, and the coil winding can obtain induced electromotive force, so that the frequency of the ultrasonic signal output by the ultrasonic generation circuit 30 can be determined.
In particular, the signal analysis means may be based on
The frequency of the received signal is determined, wherein,
e is the induced electromotive force of the coil winding of the air-core solenoid 402, and can be obtained by voltage detection. f is the frequency of the signal received by the receiving means 40, D1Is the effective diameter of the coil winding of the air core solenoid 402, D2The diameter of the magnetostrictive wire 401, N the number of turns of the coil winding of the hollow solenoid 402, and I the current passing through the coil winding of the hollow solenoid 402 can be obtained by current detection. L is the length of the hollow solenoid 402. D1，D2N and L are known quantities that can be predetermined.
The signal evaluation device can also display the determined received signal frequency f, so that the operator can visually see the signal frequency currently sorted out by the frequency selection circuit 20.
And M inductance value adjusting units 50 respectively connected to the M variable inductors, for adjusting inductance values of the connected variable inductors according to the control signal.
The present disclosure controls the inductance value of the variable inductor based on the inductance value adjusting unit 50, and only one inductance value adjusting unit 50 is shown in fig. 1, and in other embodiments, the number of inductance value adjusting units 50 may be adjusted according to the specific circuit configuration of the frequency selecting circuit 20 and the actual need.
In an embodiment of the present invention, referring to fig. 4, the inductance adjusting unit 50 may include: a controller, a driving motor 502, a gear 503 and a rack 504;
the variable inductor connected to the inductance value adjusting unit 50 includes: an iron core L01 fixedly connected to the rack 504; a fixed position inductor L02;
the controller is used for adjusting the rotation direction of the driving motor 502 according to the control signal; a gear 503 is fixedly sleeved on an output shaft of the driving motor 502, and the rack 504 is in meshing transmission with the gear 503.
It should be noted that the controller included in the inductance value adjusting unit 50 is not shown in fig. 4, and the controller may adjust the rotation direction of the driving motor 502 according to the control signal, i.e., control the forward and reverse rotation of the driving motor 502. The rotational direction of the gear 503 can be controlled by controlling the rotational direction of the drive motor 502. The rack 504 is in meshed transmission with the gear 503, and the iron core L01 in the variable inductor is fixedly connected with the rack 504, so that the rotation direction of the gear 503 can control the degree of the iron core L01 entering the inductor L02, and the adjustment of the inductance value of the variable inductor is realized. For example, when the driving motor 502 rotates forward, the gear 503 rotates counterclockwise in fig. 4, the rack 504 and the plunger L01 move upward, that is, the length of the plunger L01 in the inductor L02 decreases, so that the inductance of the variable inductor decreases. Conversely, for example, when the drive motor 502 is rotated in the reverse direction, the length of the iron core L01 in the inductor coil is increased, and the inductance value of the variable inductor is increased. Further, the controller may control the rotational speed of the drive motor 502 in addition to the rotational direction thereof.
It should be further noted that inductor L02 is wound around the outer periphery of core L011, but inductor L02 does not directly contact core L01, and inductor L02 is usually wound around a fixed hollow cylindrical housing, which is usually made of insulating material, to avoid electric conduction between core L01 and inductor L02, and a gap is reserved between the housing and core L01, so as to facilitate the up-and-down movement of core L01.
The inductance value adjusting unit 50 of this embodiment has a simple structure, is easy to implement, and is also easy to maintain. In addition, the length of the iron core L01 entering the inductor L02 can be linearly adjusted by this embodiment, so that the selection of the required inductance value can be conveniently realized, which is also beneficial to more accurately and finely control the frequency of the signal sorted by the frequency selecting circuit 20.
In an embodiment of the present invention, the method may further include:
and an analog signal isolation circuit provided between the frequency selection circuit 20 and the ultrasonic wave generation circuit 30.
The analog signal isolation circuit is favorable for improving the signal quality, and the specific circuit composition of the analog signal isolation circuit can be selected as required, for example, in the embodiment of fig. 5, the analog signal isolation circuit firstly converts continuous signals into discrete signals, namely, PWM waves, utilizes the optocoupler to realize signal isolation, and then converts the PWM waves into discrete signals. The optical coupler is utilized to realize signal isolation in the implementation mode, so that the influence of a high-voltage system on a low-voltage system is favorably avoided, and the signal quality is favorably improved. Of course, in other embodiments, the specific circuit configuration of the analog signal isolation circuit may be selected and adjusted as needed. In addition, in the embodiment of fig. 5, a controller included in the inductance value adjusting unit 50 for adjusting the rotation direction of the driving motor 502 according to the control signal is further provided between the analog signal isolation circuit and the ultrasonic wave generating circuit 30, and the analog signal isolation circuit is connected to the controller in the inductance value adjusting unit 50 as indicated by a network reference numeral X2. The analog signal isolation circuit is connected to the output of the frequency selection circuit 20 as indicated by the network reference X1.
When the inductance adjusting unit 50 adjusts the rotation direction of the driving motor according to the control signal to adjust the inductance of the variable inductor, the control signal may be manually input or may be automatically generated.
Specifically, for example, the signal analysis device may display the received signal waveform, the determined received signal frequency f, and the related analysis result, and the staff may determine whether to adjust the inductance value of the one or more variable inductors according to the displayed information. For example, if the worker finds that the amplitude of the currently sorted signal is low, which indicates that the inductance value in the frequency selecting circuit 20 is not suitable for selection, the frequency of the sorted signal is not the main frequency in the current partial discharge signal, and the inductance value of a certain variable inductor needs to be increased, for example, a related control command may be input to the signal analyzing device, the signal analyzing device may be in communication connection with the inductance value adjusting unit 50, for example, the inductance value adjusting unit 50 has the structure shown in the embodiment of fig. 4, and the signal analyzing device is in communication connection with the controller in the inductance value adjusting unit 50, and the controller adjusts the inductance value of the corresponding variable inductor according to the information carried in the control signal. For another example, the inductance value adjusting unit 50 may have an input component, such as a knob, and the like, so that the operator may adjust the input component as needed, and the controller in the inductance value adjusting unit 50 determines the corresponding control signal according to the operation of the user on the knob, and further triggers the process of adjusting the inductance value of the variable inductor.
Of course, the control signal may also be generated automatically, for example, in the embodiment of fig. 6, the controller in the inductance value adjusting unit 50 is disposed between the analog signal isolation circuit and the ultrasonic wave generating circuit 30, and the controller may detect the amplitude of the received signal output by the analog signal isolation circuit, and at the same time, continuously generate the control signal according to a preset strategy, that is, continuously change the inductance value of the variable inductor, and stop the adjustment of the inductance value of the variable inductor, that is, control the driving motor to stop rotating until the amplitude of the received signal is higher than the threshold value, at which time, the frequency of the signal sorted out by the frequency selecting circuit 20 is a suitable frequency, which is favorable for performing more accurate signal analysis subsequently.
In the solution of the present application, a frequency selection circuit 20 connected to the filter circuit 10 is provided to sort the partial discharge signals, taking into account that noise interference may still exist in the signals in the filtered frequency range. For the frequency range after filtering, in practical application, the frequency of the partial discharge signal in different scenes and at different times may be changed, and therefore, in order to realize proper partial discharge signal sorting, the frequency selecting circuit 20 in this application includes M variable inductors. M inductance value regulating unit 50 is connected with M variable inductance respectively, can adjust the inductance value of the variable inductance that is connected according to control signal, promptly through M inductance value regulating unit 50, the scheme of this application can conveniently be adjusted the frequency selection of frequency selection circuit 20 to reach suitable letter sorting effect, satisfy various complicated scenes, just also be favorable to follow-up more accurate signal analysis that carries on.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, article, or apparatus that comprises the element.
The principle and the implementation of the present invention are explained in the present application by using specific examples, and the above description of the embodiments is only used to help understanding the technical solution and the core idea of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (8)
1. A sorting receiving arrangement of signal is put in cubical switchboard office, its characterized in that includes:
the filter circuit is used for receiving the partial discharge signal and filtering;
the frequency selection circuit is connected with the filter circuit and comprises M variable inductors; m is a positive integer;
the ultrasonic generating circuit is connected with the frequency selecting circuit and used for transmitting signals;
receiving means for receiving an output signal of the ultrasonic wave generating circuit;
and the M inductance value adjusting units are respectively connected with the M variable inductors and used for adjusting the inductance values of the connected variable inductors according to control signals.
2. The device for sorting and receiving partial discharge signals of a switch cabinet according to claim 1, wherein the receiving device comprises:
a magnetostrictive device for receiving an output signal of the ultrasonic wave generation circuit based on magnetostriction;
and the signal analysis device is connected with the magnetostrictive device and is used for determining the frequency of the received signal and carrying out signal analysis.
3. The device for sorting and receiving the partial discharge signals of the switch cabinet according to claim 1, wherein the frequency selection circuit comprises:
the first end of the first resistor is connected with the first end of the first resistor and is used as the input end of the frequency selection circuit, and the second end of the first resistor is connected with the second end of the first inductor and is used as the first capacitor of the output end of the frequency selection circuit;
the first resistor;
the first inductor is connected with the second end of the first resistor at a first end, and the first inductor is a variable inductor.
4. The device for sorting and receiving partial discharge signals of a switch cabinet according to claim 1, wherein the filter circuit comprises:
the low-pass filter circuit is used for receiving the partial discharge signal;
and the high-pass filter circuit is respectively connected with the low-pass filter circuit and the frequency selection circuit.
5. The device for sorting and receiving partial discharge signals of a switch cabinet according to claim 1, further comprising:
and the analog signal isolation circuit is arranged between the frequency selection circuit and the ultrasonic wave generation circuit.
6. The device for sorting and receiving the partial discharge signals of the switch cabinet according to any one of claims 1 to 5, wherein the inductance value adjusting unit comprises: the controller, the driving motor, the gear and the rack;
the variable inductor connected to the inductance value adjusting unit includes: the iron core is fixedly connected with the rack; a fixed position inductor coil;
the controller is used for adjusting the rotation direction of the driving motor according to a control signal; the gear is fixedly sleeved on an output shaft of the driving motor, and the rack is in meshing transmission with the gear.
7. A device for sorting and receiving partial discharge signals of a switch cabinet according to claim 2, wherein the magnetostrictive device comprises: the magnetic control device comprises a magnetostrictive wire, a hollow solenoid and a magnet fixed with the hollow solenoid in position;
the magnetostrictive wire is used for receiving an output signal of the ultrasonic wave generating circuit and is arranged in the hollow solenoid.
8. A sorting and receiving device for partial discharge signals of a switch cabinet according to claim 7, characterized in that the signal analyzing device is based on
The frequency of the received signal is determined, wherein,
e is the induced electromotive force of the coil winding of the hollow solenoid, f is the frequency of the signal received by the receiving means, D1Is the effective diameter of the coil winding of the air core solenoid, D2The diameter of the magnetostrictive wire, N the number of turns of the coil winding of the hollow solenoid, I the current through the coil winding of the hollow solenoid, and L the length of the hollow solenoid.
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| CN201911349906.3A CN110893400A (en) | 2019-12-24 | 2019-12-24 | Sorting and receiving device for partial discharge signals of switch cabinet |
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| CN201911349906.3A CN110893400A (en) | 2019-12-24 | 2019-12-24 | Sorting and receiving device for partial discharge signals of switch cabinet |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111812463A (en) * | 2020-06-10 | 2020-10-23 | 深圳供电局有限公司 | High-frequency partial discharge detection system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111812463A (en) * | 2020-06-10 | 2020-10-23 | 深圳供电局有限公司 | High-frequency partial discharge detection system and method |
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