CN211348505U - Partial discharge detection device utilizing electromagnetic reflection cavity - Google Patents
Partial discharge detection device utilizing electromagnetic reflection cavity Download PDFInfo
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- CN211348505U CN211348505U CN201921824691.1U CN201921824691U CN211348505U CN 211348505 U CN211348505 U CN 211348505U CN 201921824691 U CN201921824691 U CN 201921824691U CN 211348505 U CN211348505 U CN 211348505U
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Abstract
The utility model relates to an utilize electromagnetic reflection cavity office to put detection device, put detection antenna (2), signal reflection cavity (1) and signal detection unit (3) including the office, place in detection antenna (2) signal reflection cavity (1) in the office, detection antenna (2) are put with built-in office in signal detection unit (3) and are connected. The utility model adopts the integrated design of the signal detection unit and the signal reflection cavity, thus reducing the interference of the signal transmission line; the partial discharge detection antenna is arranged in the signal reflection cavity, the signal reflection cavity generates multiple reflections on electromagnetic waves with specific frequency, the resonance is generated by excitation of the built-in partial discharge detection antenna, partial discharge detection signals are expanded, and interference of other frequency band signals generated by non-partial discharge is effectively eliminated; the signal detection unit adopts a detection processing module, outputs a low-frequency intensity curve aiming at the partial discharge signal to form an integrated antenna detection system, and facilitates secondary transmission detection processing of the partial discharge intensity signal.
Description
Technical Field
The utility model relates to a high-voltage electricity, wireless signal transmission and sensor detect technical field, concretely relates to utilize electromagnetic reflection cavity office to put detection device.
Background
The transformer plays a role in the transportation and distribution of the whole power system in transforming voltage, facilitating the transmission of power and ensuring the stable operation of the transformer, and the monitoring of the internal insulation aging condition of the transformer to influence the operation state of the transformer is of great importance, and the monitoring of the insulation state of the power transformer is an important characteristic quantity. In the actual operation monitoring, the partial discharge can be used as the basis for judging the insulation aging.
The utility model discloses a utility model patent for CN207636705U provides an on-line monitoring device for annex partial discharge in middle of high tension cable, including high frequency monitoring system, ultrasonic monitoring system, temperature monitoring system, letter accuse transmission system and CPU, high frequency monitoring system, ultrasonic monitoring system or temperature monitoring system are connected with letter accuse transmission system through connecting circuit respectively, utilize high frequency CT, ultrasonic wave and temperature to carry out real-time on-line measuring to power cable, reach and assess the insulating situation of cable.
In the prior art, the online detection method for partial discharge of the transformer mainly comprises a pulse current method, a chemical method, an ultrasonic method, an ultrahigh frequency method and the like, wherein ultrasonic waves and ultrahigh frequencies are two online detection methods which are most widely applied. The ultrahigh frequency detection method realizes detection by collecting ultrahigh frequency electromagnetic waves. When partial discharge occurs, ultrahigh frequency electromagnetic waves are radiated to the surroundings. The frequency range of the ultrahigh frequency electromagnetic signal is 300 MHz-3 GHz and is in a very high frequency range, so that the electric interference in the actual operation of the electric power equipment cannot influence the monitoring of the ultrahigh frequency electromagnetic signal, the interference is reduced, the sensitivity of the signal is improved, the signal to noise ratio is also greatly improved, and the detection accuracy and reliability are also improved. In recent years, a great deal of research is carried out on ultrahigh frequency detection methods at home and abroad because compared with the traditional detection method, the method has incomparable advantages. In view of this, a set of partial discharge online detection system based on the ultrahigh frequency sensor can be developed by using a main method for acquiring the ultrahigh frequency signal.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides an utilize electromagnetic reflection cavity office to put detection device adopts signal detection unit and signal reflection cavity integrated design, and the office is put detection antenna and is built-in the signal reflection cavity, and the signal reflection cavity produces the multiple reflection to the specific frequency electromagnetic wave, puts detection antenna excitation to built-in office and produces resonance, enlarges the office and puts detection signal, effectively gets rid of the interference that other frequency band signals that non-office put the production.
In order to achieve the above purpose, the present invention adopts the following technical solution.
The utility model provides an utilize electromagnetic reflection cavity office to put detection device, put detection antenna including the office, still include signal reflection cavity and signal detection unit, the office is put and is placed in the detection antenna in the signal reflection cavity, signal detection unit is put with built-in office and is detected the antenna and be connected.
Preferably, the signal reflection cavity is made of a metal conductive material.
In any of the above technical solutions, preferably, the signal reflection cavity is processed by a copper member.
In any of the above technical solutions, preferably, the signal reflection cavity is made of a stainless steel member.
In any of the above technical solutions, preferably, the signal reflection cavity has a design structure with an opening at one end, the electromagnetic wave enters the signal reflection cavity to form multiple reflections, and the diameter of the reflection cavity is an integral multiple of the selected detection wavelength 1/4.
In any of the above technical solutions, preferably, the electromagnetic wave signals reflected multiple times in the signal reflection cavity all pass through the built-in partial discharge detection antenna, and multiple excitation resonance is formed for the built-in partial discharge detection antenna.
In any of the above technical solutions, preferably, the signal reflection cavity is a circular opening cavity.
In any of the above technical solutions, preferably, the signal reflection cavity is an L-shaped open cavity.
In the electric power transportation, adopt the technical scheme of the utility model, high-tension electricity punctures transformer internal insulation and produces and discharge, and to the air radiation electromagnetic wave, the electromagnetic wave gets into in the signal reflection cavity from the trompil of signal reflection cavity.
In any of the above technical solutions, it is preferable that the partial discharge detection antenna adopts a narrow-band signal to design a working frequency point, and the narrow-band signal design working frequency point is an ultra-high frequency to an extremely-high frequency of 300M to 300G.
In any of the above technical solutions, preferably, the partial discharge detection antenna adopts a narrow-band signal to design an ultra-high frequency with a working frequency point of 300M-3G, so as to reach a resonant frequency with an electromagnetic wave signal reflected in the signal reflection cavity.
In any of the above technical solutions, preferably, the signal detection unit is placed at the partial discharge reflection cavity, and is connected to a built-in partial discharge detection antenna, so as to shorten the high-frequency signal connection line.
The utility model discloses in, signal detection unit and built-in office are put detection antenna and are connected. Preferably, the signal detection unit is placed at the partial discharge reflection cavity, so that the high-frequency signal connecting line can be shortened.
In any of the above technical solutions, preferably, the signal detection unit includes a detection processing module that processes the high frequency signal into a low frequency intensity signal.
In any of the above technical solutions, preferably, the detection processing module includes, but is not limited to, an envelope detection circuit, a synchronous detection circuit, and the like.
In any of the above technical solutions, preferably, the signal detection unit is connected to a built-in partial discharge detection antenna, and the signal detection unit outputs a low-frequency intensity curve for a partial discharge signal to form an integrated antenna detection system, so as to facilitate secondary transmission detection processing of the partial discharge intensity signal.
The utility model also provides an utilize electromagnetic reflection cavity partial discharge detection method. The partial discharge detection method using the electromagnetic reflection cavity partial discharge detection device comprises the following steps:
the signal detection unit and the signal reflection cavity are integrally designed, so that the interference of a signal transmission line is reduced;
the partial discharge detection antenna is arranged in the signal reflection cavity, the signal reflection cavity generates multiple reflections on electromagnetic waves with specific frequency and excites the built-in partial discharge detection antenna to generate resonance, so that partial discharge detection signals are enlarged, and meanwhile, other frequency band signals which are not generated by partial discharge cannot be reflected to form resonance on the partial discharge detection antenna, so that interference is effectively eliminated;
the signal detection unit adopts a detection processing module, outputs a low-frequency intensity curve aiming at the partial discharge signal to form an integrated antenna detection system, and facilitates secondary transmission detection processing of the partial discharge intensity signal.
Compared with the prior art, the above technical scheme of the utility model following beneficial effect has:
the partial discharge detection antenna is arranged in the signal reflection cavity, the signal reflection cavity reflects electromagnetic waves with specific frequency for multiple times, and resonance is generated by excitation of the built-in partial discharge detection antenna, so that partial discharge detection signals are enlarged by multiple times, and the detection accuracy of the narrow-band antenna on the partial discharge signals is effectively improved.
Meanwhile, signals of other frequency bands generated by non-partial discharge cannot form resonance to the partial discharge detection antenna in a reflective mode, and therefore the effect of effectively eliminating interference is achieved.
Due to the adoption of the integrated design of the signal detection unit and the signal reflection cavity, the interference of a signal transmission line is reduced. The signal detection unit adopts a detection processing module, outputs a low-frequency intensity curve aiming at the partial discharge signal to form an integrated antenna detection system, and facilitates secondary transmission detection processing of the partial discharge intensity signal.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be 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 these drawings without inventive exercise.
Fig. 1 is a schematic structural view of a circular perforated signal reflection cavity according to a preferred embodiment of the present invention, which utilizes an electromagnetic reflection cavity partial discharge detection apparatus;
fig. 2 is a schematic structural view of an L-shaped opening signal reflection cavity according to a preferred embodiment of the present invention, wherein the detection device is partially placed in the electromagnetic reflection cavity;
FIG. 3 is a schematic diagram of a partial discharge detection antenna responding to a partial discharge signal without using a signal reflection cavity;
fig. 4 is a schematic diagram of the signal output enhancement waveform after the signal reflection cavity is adopted according to the present invention.
Reference numerals: 1. the device comprises a signal reflection cavity, 2, a partial discharge detection antenna, 3, a signal detection unit, 4 and a signal entrance port.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The ultra-high frequency band (300M-3G) is generally adopted in the electromagnetic wave detection technology of partial discharge, the antenna design aiming at the frequency band is often a big difficulty, in order to measure the discharge capacity of the partial discharge, a broadband antenna is generally designed and is particularly sensitive to electromagnetic interference, so that the interference or partial discharge data cannot be distinguished in practical application due to the fact that partial discharge detection equipment is successfully amplified in a laboratory (without interference) in recent years, a partial discharge impact signal is only a single pulse, signal receiving and triggering failure can be caused due to the narrow frequency band design, the measurement is not accurate, and the main breakthrough direction of the existing partial discharge detection antenna design is solved. In order to overcome the problem that transformer partial discharge's on-line measuring method exists in prior art, the embodiment of the utility model provides an utilize electromagnetic reflection cavity office to put detection device, the innovation has been proposed and has been adopted narrow frequency band technique, cooperation reflection cavity realizes the antenna resonance technique, this technical scheme includes that the office puts detection antenna, the signal reflection cavity, signal detection unit, adopt signal detection unit and signal reflection cavity integrated design, the office puts detection antenna embeds in the signal reflection cavity, the signal reflection cavity produces the multiple reflection to specific frequency electromagnetic wave, to the excitation of the built-in office detection antenna production resonance, enlarge the office and put detection signal, effectively get rid of the interference of other frequency band signals that non-office put the production.
Example 1
As shown in fig. 1, the partial discharge detection apparatus using an electromagnetic reflection cavity according to this embodiment includes a partial discharge detection antenna 2, a signal reflection cavity 1, and a signal detection unit 3, where the partial discharge detection antenna 2 is disposed in the signal reflection cavity 1, and the signal detection unit 3 is connected to the disposed partial discharge detection antenna 2.
In the present embodiment, the signal reflection cavity 1 is made of a conductive metal material, and may be made of copper or stainless steel.
In the electric power transportation, the high voltage electricity breaks down the internal insulating layer of the transformer to generate discharge, the discharge radiates electromagnetic waves to air, and the electromagnetic waves enter the signal reflection cavity 1 from the open hole of the signal reflection cavity 1.
As shown in fig. 1, in the partial discharge detection device using the electromagnetic reflection cavity according to the embodiment, the signal reflection cavity 1 adopts a structure with an opening at one end, and the signal reflection cavity 1 with a circular opening forms multiple reflections after electromagnetic waves enter the signal reflection cavity 1, and the diameter of the reflection cavity is an integral multiple of the selected detection wavelength 1/4.
In the present embodiment, by using the electromagnetic reflection cavity partial discharge detection apparatus, the electromagnetic wave signals reflected multiple times in the signal reflection cavity 1 all pass through the built-in partial discharge detection antenna 2, and multiple excitation resonances are formed for the built-in partial discharge detection antenna 2.
In the device for detecting partial discharge by using the electromagnetic reflection cavity, the partial discharge detection antenna 2 adopts a narrow-band signal to design a working frequency point, and the narrow-band signal design working frequency point is ultrahigh frequency to extremely high frequency of 300M-300G.
In the partial discharge detection device using the electromagnetic reflection cavity of the embodiment, the partial discharge detection antenna 2 adopts a narrow-band signal to design an ultrahigh frequency with a working frequency point of 300M-3G, so as to reach a resonant frequency of an electromagnetic wave signal reflected in the signal reflection cavity 1.
In the partial discharge detection device using the electromagnetic reflection cavity according to the embodiment, the signal detection unit 3 is placed at the partial discharge reflection cavity and connected to the built-in partial discharge detection antenna 2, so as to shorten the high-frequency signal connection line. The signal detection unit 3 includes a detection processing module that processes the high frequency signal into a low frequency intensity signal. The detection processing module includes, but is not limited to, an envelope detection circuit, a synchronous detection circuit, etc. The signal detection unit 3 is connected with the built-in partial discharge detection antenna 2, and the signal detection unit 3 outputs a low-frequency intensity curve aiming at the partial discharge signal to form an integrated antenna detection system, so that secondary transmission detection processing of the partial discharge intensity signal is facilitated.
The partial discharge detection method using the above partial discharge detection device with an electromagnetic reflection cavity in this embodiment includes: the partial discharge detection antenna 2 is arranged in the signal reflection cavity 1, the signal reflection cavity 1 reflects electromagnetic waves with specific frequency for multiple times, and the resonance is generated by exciting the built-in partial discharge detection antenna 2, so that partial discharge detection signals can be enlarged by multiple times, and the detection accuracy of the narrow-band antenna on the partial discharge signals is effectively improved; meanwhile, other frequency band signals generated by non-partial discharge cannot form resonance to the partial discharge detection antenna 2 in a reflective manner, so that an effective interference elimination effect is achieved; the signal detection unit 3 and the signal reflection cavity 1 are integrally designed, so that the interference of a signal transmission line is reduced; the signal detection unit 3 adopts a detection processing module, outputs a low-frequency intensity curve aiming at the partial discharge signal to form an integrated antenna detection system, and facilitates secondary transmission detection processing of the partial discharge intensity signal.
Example 2
In the partial discharge detection device using the electromagnetic reflection cavity provided in this embodiment, as shown in fig. 2, the signal reflection cavity 1 is an L-shaped open-hole cavity.
In the present embodiment, the partial discharge detection device utilizing the electromagnetic reflection cavity is characterized in that the partial discharge detection antenna 2 is arranged in the signal reflection cavity 1, the signal detection unit 3 is arranged at the partial discharge reflection cavity, and the signal detection unit 3 is connected with the partial discharge detection antenna 2 arranged in the signal reflection cavity 1. The signal reflection cavity 1 is made of a metal conductive material, and is preferably made of a copper piece or a stainless steel piece. The signal reflection cavity 1 is an L-shaped opening cavity, electromagnetic waves enter the signal reflection cavity 1 with the L-shaped opening through the signal entrance port 4 to form multiple reflection, and the diameter of the reflection cavity is an integral multiple of the selected detection wavelength 1/4. Electromagnetic wave signals reflected for many times in the signal reflection cavity 1 all pass through the built-in partial discharge detection antenna 2, and multiple excitation resonance is formed on the built-in partial discharge detection antenna 2. The partial discharge detection antenna 2 adopts a narrow-band signal to design a working frequency point, the narrow-band signal design working frequency point is 300M-300G of ultrahigh frequency-extremely high frequency, and the resonant frequency of the narrow-band signal design working frequency point and the resonant frequency of an electromagnetic wave signal reflected in the signal reflection cavity 1 are achieved.
In the partial discharge detection device using the electromagnetic reflection cavity of the embodiment, the signal detection unit 3 is placed at the partial discharge reflection cavity, so that the high-frequency signal connection line is shortened. The signal detection unit 3 includes a detection processing module that processes the high frequency signal into a low frequency intensity signal. The detection processing module includes, but is not limited to, an envelope detection circuit, a synchronous detection circuit, etc. The signal detection unit 3 is connected with the built-in partial discharge detection antenna 2, and the signal detection unit 3 outputs a low-frequency intensity curve aiming at the partial discharge signal to form an integrated antenna detection system, so that secondary transmission detection processing of the partial discharge intensity signal is facilitated.
The principle and implementation process of the partial discharge detection method using the electromagnetic reflection cavity partial discharge detection device in this embodiment are the same as those in embodiment 1. The signal detection unit 3 and the signal reflection cavity 1 are integrally designed, so that the interference of a signal transmission line is reduced; the partial discharge detection antenna 2 is arranged in the signal reflection cavity 1, the signal reflection cavity 1 reflects electromagnetic waves with specific frequency for multiple times, and the resonance is generated by exciting the built-in partial discharge detection antenna 2, so that partial discharge detection signals are enlarged, and meanwhile, other frequency band signals which are not generated by partial discharge cannot reflect to form the resonance of the partial discharge detection antenna 2, so that interference is effectively eliminated; the signal detection unit 3 adopts a detection processing module, outputs a low-frequency intensity curve aiming at the partial discharge signal to form an integrated antenna detection system, and facilitates secondary transmission detection processing of the partial discharge intensity signal.
With reference to fig. 1 to fig. 2, and embodiments 1 and 2, this embodiment innovatively proposes that a narrow frequency band technology is adopted, an antenna resonance technology is implemented by matching a reflection cavity, a signal detection unit and a signal reflection cavity are integrally designed to reduce interference of a signal transmission line, an partial discharge detection antenna is embedded in the signal reflection cavity, the signal reflection cavity reflects electromagnetic waves of a specific frequency for multiple times, the embedded partial discharge detection antenna is excited to generate resonance, a partial discharge detection signal is expanded, and interference of signals of other frequency bands generated by non-partial discharge is effectively eliminated. Fig. 3 is a graph showing the response waveform of a partial discharge detection antenna to a partial discharge surge signal without using a reflective cavity. Fig. 4, which is a clear comparison with the above, shows the response waveform of the partial discharge detection antenna to the partial discharge impact signal after the reflective cavity is adopted, and the dotted line is the signal output of the envelope detection circuit.
The above description is only intended to describe the preferred embodiments of the present invention, and not to limit the scope of the present invention; the above description is only a specific embodiment of the present invention, and is not intended to limit the scope of the present invention; without departing from the spirit of the present invention, any modification, equivalent replacement, or improvement made by the technical solution of the present invention by those of ordinary skill in the art should fall within the protection scope defined by the claims of the present invention.
Claims (14)
1. The utility model provides an utilize electromagnetic reflection cavity office to put detection device, includes the office and puts detection antenna, its characterized in that still includes signal reflection cavity and signal detection unit, the office is put and is placed in the detection antenna and place in the signal reflection cavity, signal detection unit is put detection antenna with built-in office and is connected.
2. The partial discharge detection device utilizing an electromagnetic reflective cavity according to claim 1, wherein said signal reflective cavity is made of a metal conductive material.
3. The partial discharge detection device utilizing an electromagnetic reflective cavity according to claim 2, wherein said signal reflective cavity is machined from a copper piece.
4. The partial discharge detection device utilizing an electromagnetic reflective cavity according to claim 2, wherein said signal reflective cavity is machined from stainless steel.
5. The partial discharge detection device utilizing the electromagnetic reflection cavity according to claim 2, wherein the signal reflection cavity has an open end, electromagnetic waves enter the signal reflection cavity to form multiple reflections, and the diameter of the reflection cavity is an integral multiple of the selected detection wavelength 1/4.
6. The device as claimed in claim 5, wherein the electromagnetic wave signals reflected multiple times in the signal reflection cavity pass through the built-in partial discharge detection antenna, and multiple excitation resonances are formed on the built-in partial discharge detection antenna.
7. The partial discharge detection device utilizing an electromagnetic reflective cavity according to claim 6, wherein said signal reflective cavity is a circular open-hole cavity.
8. The partial discharge detection device utilizing an electromagnetic reflective cavity according to claim 6, wherein said signal reflective cavity is an L-shaped open cavity.
9. The partial discharge detection device using the electromagnetic reflection cavity according to claim 1, wherein the partial discharge detection antenna uses a narrow-band signal design operating frequency point, and the narrow-band signal design operating frequency point is an ultra-high frequency to an ultra-high frequency of 300M to 300G.
10. The partial discharge detection device using the electromagnetic reflection cavity according to claim 9, wherein the partial discharge detection antenna uses a narrow-band signal to design an ultra high frequency with an operating frequency point of 300M to 3G to reach a resonant frequency with an electromagnetic wave signal reflected in the signal reflection cavity.
11. The partial discharge detection device using an electromagnetic reflective cavity according to claim 1, wherein the signal detection unit is disposed at the partial discharge reflective cavity.
12. The apparatus according to claim 11, wherein the signal detection unit comprises a detection processing module for processing the high frequency signal into a low frequency intensity signal.
13. The apparatus according to claim 12, wherein the detection processing module comprises an envelope detection circuit or a synchronous detection circuit.
14. The partial discharge detection device using an electromagnetic reflection cavity according to claim 13, wherein the signal detection unit is connected to a built-in partial discharge detection antenna, and the signal detection unit outputs a low-frequency intensity curve for the partial discharge signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921824691.1U CN211348505U (en) | 2019-10-28 | 2019-10-28 | Partial discharge detection device utilizing electromagnetic reflection cavity |
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| CN201921824691.1U CN211348505U (en) | 2019-10-28 | 2019-10-28 | Partial discharge detection device utilizing electromagnetic reflection cavity |
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| CN211348505U true CN211348505U (en) | 2020-08-25 |
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