阅读说明：本技术 悬式绝缘子的检测装置及检测方法 (Detection device and detection method for suspension insulator ) 是由 赵�衍 于 2020-11-23 设计创作，主要内容包括：本申请提供了一种悬式绝缘子的检测装置及检测方法,能够实现对悬式绝缘子内部裂纹的在线自动检测。该检测装置包括：一悬式绝缘子；一检测部件,安装在所述悬式绝缘子内部,用于利用电磁波检测所述悬式绝缘子内部的裂纹。(The application provides a detection device and a detection method for a suspension insulator, which can realize online automatic detection of internal cracks of the suspension insulator. The detection device includes: a suspension insulator; and the detection component is arranged inside the suspension insulator and is used for detecting cracks inside the suspension insulator by using electromagnetic waves.)

1. A detection device for a suspension insulator is characterized by comprising:

a suspension insulator;

and the detection component is arranged inside the suspension insulator and is used for detecting cracks inside the suspension insulator by using electromagnetic waves.

2. The testing device of claim 1, wherein the insulator in the suspension insulator comprises a head portion and an umbrella body;

the position of the detection component and the emission direction of the electromagnetic wave are arranged so that the electromagnetic wave propagates to the umbrella body in the insulating member after entering the insulating member from the end face of the head.

3. The detecting device according to claim 2, wherein an included angle between the emission direction of the electromagnetic wave and a central axis of the suspension insulator is greater than 0 degree and less than 90 degrees.

4. The testing device of any of claims 1-3, wherein the testing member is located on the central axis of the suspension insulator between the metal cap and the insulator of the suspension insulator or between the metal foot and the insulator of the suspension insulator.

5. The testing device of any of claims 1-4, wherein the position of the testing member and the insulator in the suspension insulator are arranged such that there is no gap between the testing member and the insulator.

6. The testing device of any of claims 1-4, wherein the testing member is attached to a surface of an insulator in the suspension insulator.

7. The detection device according to claim 6, wherein the detection component comprises a dielectric substrate and an antenna positioned on one side of the dielectric substrate, and the other side of the dielectric substrate is attached to the surface of the insulating member in the suspension insulator.

8. The detecting device for detecting the rotation of a motor rotor according to claim 7, wherein the insulating member is made of the same material as that of the dielectric substrate; alternatively, the first and second electrodes may be,

the insulating piece is made of ceramic, and the dielectric substrate is made of silicon and aluminum oxide; alternatively, the first and second electrodes may be,

the insulating piece is made of ceramic, and the dielectric constant of the dielectric substrate is 7-13.

9. The detection device according to any one of claims 1-8, wherein the detection means comprises a plurality of transmitting antennas for transmitting electromagnetic waves in different directions for detecting different portions of the insulator in the suspension insulator.

10. The detection device according to any one of claims 1 to 9, wherein the electromagnetic wave is a radio frequency wave, a microwave, a millimeter wave, or a terahertz wave.

11. The testing device according to any one of claims 1-10, wherein the suspension insulator is made of ceramic, glass or composite material.

12. A detection method of a suspension insulator is characterized by comprising the following steps:

controlling a detection part inside the suspension insulator to emit electromagnetic waves to an insulator of the suspension insulator after the suspension insulator is installed on a power transmission line;

and receiving the reflected wave of the electromagnetic wave to detect whether cracks occur in the insulating part.

13. The method of claim 12, wherein the controlling the detection component inside the suspension insulator to emit electromagnetic waves toward the insulator of the suspension insulator comprises:

and controlling the detection part to emit electromagnetic waves to the insulating part, so that the electromagnetic waves propagate to the umbrella body of the insulating part in the insulating part after entering the insulating part from the end face of the head part of the insulating part.

14. The method of claim 12 or 13, wherein the detection member is attached to a surface of an insulator in the suspension insulator.

15. The detection method according to any one of claims 12 to 14, characterized in that the detection means comprise a plurality of transmission antennas and a plurality of reception antennas,

the method further comprises the following steps:

controlling the plurality of transmitting antennas to sequentially transmit electromagnetic waves in different directions and the plurality of receiving antennas to sequentially receive electromagnetic waves in different directions so as to detect different parts of the insulating member in the suspension insulator; alternatively, the first and second electrodes may be,

controlling the plurality of transmitting antennas to simultaneously transmit electromagnetic waves in different directions and the plurality of receiving antennas to simultaneously receive electromagnetic waves in different directions so as to detect different parts of the insulator in the suspension insulator; alternatively, the first and second electrodes may be,

controlling the plurality of transmitting antennas to sequentially transmit electromagnetic waves in different directions and the plurality of receiving antennas to simultaneously receive the electromagnetic waves in different directions so as to detect different parts of the insulating member in the suspension insulator; alternatively, the first and second electrodes may be,

controlling the plurality of transmitting antennas to simultaneously transmit electromagnetic waves in different directions and the plurality of receiving antennas to sequentially receive the electromagnetic waves in different directions so as to detect different parts of the insulating member in the suspension insulator; alternatively, the first and second electrodes may be,

the multiple transmitting antennas and the multiple receiving antennas form a phased array or a multiple-input multiple-output (MIMO) sparse array, and the equivalent transmitting direction and the equivalent receiving direction of the phased array or the MIMO sparse array are adjusted through an electric scanning mechanism so as to detect different parts of the insulating piece in the suspension insulator.

Technical Field

The present disclosure relates to the field of product inspection technologies, and more particularly, to a device and a method for inspecting a suspension insulator.

Background

Insulators are capable of achieving electrical insulation and mechanical fixation and are therefore commonly used on transmission lines or on substations. However, the insulator has cracks in its interior after long-term use. When the cracks reach a certain degree, the circuit can collapse, and serious electric power accidents are caused. Therefore, in order to prevent a serious power accident, it is necessary to detect an internal crack of the insulator.

At present, a power grid company mainly adopts a manual inspection mode to detect cracks, appearance inspection is carried out through visual inspection or other means, and no reliable method for checking internal cracks exists. Therefore, the power grid company can replace insulators in large batches in a period of several years, and in order to guarantee safety, the replacement period is far shorter than the service life of a normal insulator, which causes a great amount of waste.

The suspension insulator is mainly used for suspending an overhead transmission line and is high in installation position, so that cracks in the suspension insulator are difficult to detect in a manual inspection mode in high altitude after the suspension insulator is put into use.

Disclosure of Invention

In view of this, embodiments of the present application are directed to providing a device and a method for detecting a suspension insulator, which can implement online automatic detection of a crack inside the suspension insulator.

This application first aspect provides a detection device of suspension insulator, includes: a suspension insulator; and the detection component is arranged inside the suspension insulator and is used for detecting cracks inside the suspension insulator by using electromagnetic waves.

In one embodiment, the insulator in the suspension insulator comprises a head and an umbrella; the position of the detection component and the emission direction of the electromagnetic wave are arranged so that the electromagnetic wave propagates to the umbrella body in the insulating member after entering the insulating member from the end face of the head.

In one embodiment, an included angle between the emission direction of the electromagnetic wave and a central axis of the suspension insulator is greater than 0 degree and less than 90 degrees.

In one embodiment, the detection part is located on the central axis of the suspension insulator and is located between the metal cap and the insulator of the suspension insulator or between the metal pin and the insulator of the suspension insulator.

In one embodiment, the position of the detection means and the insulator in the suspension insulator is arranged such that there is no gap between the detection means and the insulator.

In one embodiment, the detection member is attached to a surface of an insulator in the suspension insulator.

In one embodiment, the detection component comprises a dielectric substrate and an antenna positioned on one side of the dielectric substrate, and the other side of the dielectric substrate is attached to the surface of an insulating part in the suspension insulator.

In one embodiment, the material of the insulating part is the same as that of the dielectric substrate; or the insulating part is made of ceramic, and the dielectric substrate is made of silicon and aluminum oxide; or the insulating piece is made of ceramic, and the dielectric constant of the dielectric substrate is between 7 and 13.

In one embodiment, the detection means comprises a plurality of transmitting antennas for transmitting electromagnetic waves in different directions for detecting different portions of the insulator in the suspension insulator.

In one embodiment, the electromagnetic wave is a radio frequency wave, a microwave, a millimeter wave, or a terahertz wave.

In one embodiment, the suspension insulator is made of ceramic, glass or composite material.

The second aspect of the present application provides a method for detecting a suspension insulator, including: controlling a detection part inside the suspension insulator to emit electromagnetic waves to an insulator of the suspension insulator after the suspension insulator is installed on a power transmission line; and receiving the reflected wave of the electromagnetic wave to detect whether cracks occur in the insulating part.

In one embodiment, the controlling the detection part inside the suspension insulator to emit electromagnetic waves to the insulator of the suspension insulator includes: and controlling the detection part to emit electromagnetic waves to the insulating part, so that the electromagnetic waves propagate to the umbrella body of the insulating part in the insulating part after entering the insulating part from the end face of the head part of the insulating part.

In one embodiment, the detection member is attached to a surface of an insulator in the suspension insulator.

In one embodiment, the detection component comprises a plurality of transmit antennas and a plurality of receive antennas, the method further comprising:

controlling the plurality of transmitting antennas to sequentially transmit electromagnetic waves in different directions and the plurality of receiving antennas to sequentially receive electromagnetic waves in different directions so as to detect different parts of the insulating member in the suspension insulator; alternatively, the first and second electrodes may be,

controlling the plurality of transmitting antennas to simultaneously transmit electromagnetic waves in different directions and the plurality of receiving antennas to simultaneously receive electromagnetic waves in different directions so as to detect different parts of the insulator in the suspension insulator; alternatively, the first and second electrodes may be,

controlling the plurality of transmitting antennas to sequentially transmit electromagnetic waves in different directions and the plurality of receiving antennas to simultaneously receive the electromagnetic waves in different directions so as to detect different parts of the insulating member in the suspension insulator; alternatively, the first and second electrodes may be,

controlling the plurality of transmitting antennas to simultaneously transmit electromagnetic waves in different directions and the plurality of receiving antennas to sequentially receive the electromagnetic waves in different directions so as to detect different parts of the insulating member in the suspension insulator; alternatively, the first and second electrodes may be,

the multiple transmitting antennas and the multiple receiving antennas form a phased array or a MIMO sparse array, and the equivalent transmitting direction and the equivalent receiving direction of the phased array or the MIMO sparse array are adjusted through an electric scanning mechanism so as to detect different parts of the insulator in the suspension insulator.

Based on the technical scheme, the detection component is integrated inside the suspension insulator, so that the detection component can accompany the whole life cycle of the suspension insulator, and the detection component can automatically detect the crack condition inside the insulator, thereby realizing the online automatic detection of the crack inside the suspension insulator in the high altitude.

Drawings

Fig. 1 is a schematic structural diagram of a suspension insulator according to an embodiment of the present application.

Fig. 2 is a schematic view illustrating an insulator in a suspension insulator according to an embodiment of the present disclosure.

Fig. 3 is a schematic diagram illustrating a principle of detecting cracks inside an insulator according to an embodiment of the present application.

Fig. 4 is a schematic structural diagram of a planar antenna provided in an embodiment of the present application.

Fig. 5-9 are schematic diagrams illustrating the arrangement position of the detection component in the suspension insulator provided by the embodiment of the application.

Fig. 10 is a schematic diagram illustrating a crack detection principle of a suspension insulator according to an embodiment of the present application.

Fig. 11 is a schematic diagram illustrating a transmission angle of a plurality of transmission antennas according to an embodiment of the present application.

Fig. 12 is a flowchart illustrating a method for detecting a suspension insulator according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments.

For convenience of description, the structure of the suspension insulator will be described with reference to fig. 1 and 2.

Fig. 1 is a schematic structural view of a suspension insulator, and fig. 2 is a schematic structural view of an insulator in the suspension insulator. The suspension insulator 200 may include an insulator 210, a metal cap 220, and a metal leg 230. The insulator 210 may include a head 211 and an umbrella 212, the head 211 may be referred to as an inverted U-shaped structure and the umbrella 212 may be referred to as a skirt. The outer end face of the head 211 can be connected with the metal cap 220, and a cement 240 such as cement or asphalt can be filled between the head 211 and the metal cap 220 for reinforcement; the inner end surface of the head 211 may be connected to the metal leg 230, and a cement 240 such as cement or asphalt may be filled between the head 211 and the metal leg 230 for reinforcement.

In addition, the end of the metal cap 220 may be further provided with a split lock 260, and the split lock 260 may be used to connect metal pins of other insulators to string multiple insulators together.

The suspension insulator is subjected to stress for a long time, cracks are generated in the suspension insulator, and the cracks are continuously enlarged with the passage of time. When the cracks reach a certain degree, the circuit collapses, resulting in a serious power accident.

Because the suspension insulator is mainly used for suspending an overhead transmission line and the installation position is higher, the suspension insulator is difficult to detect cracks of the insulator in high altitude in a manual inspection mode after being put into use.

In addition, with the continuous expansion of the power grid scale, the number of high-voltage transmission lines is more and more, and the number of used suspension insulators is more and more, which brings more and more challenges to the manual inspection of the insulator cracks.

Based on this, the embodiment of the application provides a detection device of suspension insulator, can realize the online detection to the inside crackle of suspension insulator.

The detection device may include a suspension insulator and a detection member. The detection member is installed inside the suspension insulator and is used for detecting cracks inside the suspension insulator by using electromagnetic waves.

The material of the suspension insulator is not specifically limited in the embodiments of the present application, for example, the material of the suspension insulator may be ceramic, glass, or a composite material.

The embodiment of the application integrates the detection part inside the suspension insulator, so that the detection part can be along with the whole life cycle of the suspension insulator, the aging process of the suspension insulator can be monitored for a long time, the detection part can automatically detect the crack condition inside the insulator, the online automatic detection of the cracks inside the suspension insulator in the high altitude is realized, and a large amount of manual inspection and manual operation which consumes time and money are avoided.

The scheme of this application embodiment can detect the inside crackle of insulator, can have pertinence like this and change the insulator to can avoid changing the waste that the insulator led to the fact in batches.

The detection component of the embodiments of the present application may be an electromagnetic wave reflection measurement system, similar to the detection principle of radar, reflectometer, and the like.

Taking radar as an example, it may include a transmitter, a receiver, a signal generator, a transmitting antenna, a receiving antenna, an echo signal processing unit, and the like. Taking a continuous wave modulated continuous wave (FMCW) radar as an example, a frequency-sweep signal emitted by the radar enters a radar transmitter after being reflected by a target object, and due to time delay, the reflected signal and the originally emitted frequency-sweep signal generate a frequency difference, and the frequency difference frequency reflects the distance between the target and the radar, and the frequency difference is higher when the distance is farther. The frequency of the difference frequency can be obtained by Fast Fourier Transform (FFT) at the back end of the radar receiver.

The above principle can be applied to the crack detection process of the insulator, and specifically, the detection component can emit electromagnetic waves to the insulator and receive reflected waves reflected from the interior of the insulator, and the reflected waves can be used for determining whether a crack exists in the interior of the insulator.

The embodiments of the present application are mainly concerned with the case of cracks inside the insulator in a suspension insulator, and therefore, the following description focuses on the detection of cracks inside the insulator.

Fig. 3 shows a schematic diagram of the basic principle of crack detection. Wherein, the left side of fig. 3 shows the detection schematic diagram of the insulator without cracks inside, and the right side of fig. 3 shows the detection schematic diagram of the insulator with cracks inside.

When there is no crack inside the insulator 320, after the detection part 310 emits the electromagnetic wave 312 to the insulator 320, part of the electromagnetic wave 312 may be reflected on both surfaces of the insulator 320 to form a reflected wave 314 and a reflected wave 316, respectively, and the reflected wave 314 and the reflected wave 316 may be received by the detection part 310.

Since the electromagnetic wave is reflected at the interface where the dielectric constant abruptly changes, when the detecting part 310 emits the electromagnetic wave 312 toward the insulating member 320 when there is a crack inside the insulating member 320, the electromagnetic wave 312 is reflected at the position of the crack 330 to form a reflected wave 318 in addition to the reflected wave 314 and the reflected wave 316 formed by the reflection on both surfaces of the insulating member 320, so that the reflected wave 314, the reflected wave 316, and the reflected wave 318 can be received by the detecting part 310.

Based on the principle, the detection device of the embodiment of the application can judge whether the interior of the insulator has cracks or not according to whether the reflected wave changes or not.

As can be seen from fig. 3, the electromagnetic wave is reflected on the surface of the insulating member, and in order to obtain better detection effect, the embodiment of the present application expects that more electromagnetic wave can be coupled with the insulating member and enter the inside of the insulating member, rather than being reflected before entering the insulating member. Therefore, in order to enhance the coupling between the electromagnetic wave and the insulating member and reduce the reflection of the electromagnetic wave before the electromagnetic wave enters the insulating member, the embodiments of the present application may set the positions of the detection part and the insulating member so that there is no gap between the detection part and the insulating member.

Still taking fig. 3 as an example, when there is no gap between the detecting component 310 and the insulating member 320, the reflection of the electromagnetic wave 312 on the first surface of the insulating member 320 can be reduced, that is, the reflected wave 314 is reduced, thereby reducing the reflection loss caused by the surface of the insulating member 320. Thus, most of the electromagnetic waves can enter the insulating member 320, thereby improving the detection performance of the detection member 310.

The embodiment of the present application does not specifically limit the position arrangement manner of the detection member and the insulating member. The absence of a gap between the detection component and the insulator may mean that the detection component is directly attached to the insulator, or that a dielectric layer is filled between the detection component and the insulator, so that no gap exists between the detection component and the insulator.

As an implementation manner, other media may be filled between the detection component and the insulating member, so that no gap exists between the detection component and the insulating member. Since electromagnetic waves are easily reflected at the interface where the dielectric constant abruptly changes, in this case, in order to enhance the coupling between the electromagnetic waves and the insulator, the dielectric constant of the filled medium is the same as or close to that of the insulator.

As another implementation, the detection component may be attached to a surface of the insulating member, such that the detection component and the insulating member are connected seamlessly. For example, the antenna in the detection component can be seamlessly attached to the insulator; for another example, for an antenna having a dielectric substrate, the dielectric substrate can be attached to the insulating member without a seam.

Specifically, the detection component may include a dielectric substrate and an antenna located on one side of the dielectric substrate, and the other side of the dielectric substrate is attached to the surface of the insulating member, so that seamless adhesion between the detection component and the insulating member may be achieved. In order to enhance the coupling between the electromagnetic wave and the insulator, the dielectric constant of the dielectric substrate is selected to be the same as or similar to the dielectric constant of the insulator.

For example, for an insulator made of ceramic, which has a dielectric constant of about 9, the dielectric substrate may be made of the same material as the insulator and may also be made of ceramic; alternatively, the dielectric substrate can be made of a material having a dielectric constant similar to that of ceramic, such as silicon, aluminum oxide, or a material having a dielectric constant between 7 and 13.

Preferably, the material of the dielectric substrate and the material of the insulating member may be set to be the same, so that the coupling between the electromagnetic wave and the insulating member can be maximally enhanced.

Of course, for other materials of the insulating member, such as glass, composite material, etc., the corresponding substrate material may be selected in the above manner.

The antenna in the embodiment of the present application may be a planar antenna, and may also be an antenna with other non-planar structures, such as a waveguide antenna, a horn antenna, and the like.

Taking the material of the insulator as the same as that of the dielectric substrate as an example, if the material of the insulator is ceramic, the material of the dielectric substrate is also ceramic. As shown in fig. 4, the detecting component 230 in the embodiment of the present application may include a planar antenna 231, the planar antenna 231 may be disposed on the top metal surface of the printed circuit board with the ceramic substrate 232, and the other layers (including the bottom surface) of the printed circuit board corresponding to the location area of the planar antenna 231 may not have any ground metal layer, so as to ensure that the electromagnetic wave signal emitted by the planar antenna 231 is not reflected by the metal layer. If the other surface of the ceramic substrate 232 is brought into close contact with the surface of the insulator 210, the dielectric constants of the ceramic substrates 232 and the ceramic material of the insulator 210 are close to each other, so that no significant electromagnetic wave reflection occurs between the ceramic substrates 232 and the surface of the insulator 210, and electromagnetic wave radiation can be efficiently performed into the insulator 210. For the same reason, the reflected wave is also efficiently transmitted back to the planar antenna 232, and is received by the detection section.

In addition, a wave-absorbing material 234 is disposed on the other side of the planar antenna 231, and the wave-absorbing material 234 is used for absorbing the electromagnetic wave leaking to the position to avoid the electromagnetic wave from affecting the detection result. A metal shell 233 is also provided outside the planar antenna 231 and the wave-absorbing material 234.

The arrangement position of the detection component is not particularly limited in the embodiment of the present application.

For example, in order to detect cracks in the entire suspension insulator using a small number of detection members, the detection members may be provided on the central axis of the suspension insulator.

Specifically, the detection part may be disposed on a central axis of the suspension insulator, and between the metal cap of the suspension insulator and the insulator, or between the metal leg of the suspension insulator and the insulator. By arranging the detection means on the central axis of the suspension insulator, the detection means can detect cracks in more areas of the insulator than in other locations.

Fig. 5 and 6 are schematic views showing the detection member 270 disposed between the metal cap 220 and the insulating member 210. Fig. 5 shows a case where the detection member 270 is disposed on the inner surface of the metal cap 220, and fig. 6 shows a case where the detection member 270 is disposed on the upper end surface of the head portion of the insulating member 210.

Fig. 7 and 8 are schematic views showing the detection member 270 disposed between the metal leg 230 and the insulating member 220. Fig. 7 shows a case where the detection member 270 is provided on the lower end surface of the head portion of the insulating member 210, and fig. 8 shows a case where the detection member 270 is provided on the upper end surface of the metal leg 230.

Fig. 5 to 8 show a case where the detecting member 270 is located on the central axis of the suspension insulator 200, and in some cases, the detecting member 270 is provided at a position deviated from the central axis of the suspension insulator 200, which can achieve a better detection effect.

Of course, the position of the detection member is not limited to this, and the detection member may be provided at another position. For example, it may be disposed at any position near the head of the insulator. As shown in fig. 9, the sensing part 270 may be provided at a side position of the head of the insulating member 210.

Due to the special shape of the suspension insulator, in order to better detect cracks inside the suspension insulator, the emission direction of the electromagnetic waves can be set, so that the electromagnetic waves can propagate inside the insulator after entering the insulator.

Preferably, the position of the detection part and the emission direction of the electromagnetic wave can be set so that the electromagnetic wave propagates to the umbrella body in the insulating part after entering the insulating part from the end face of the head part of the insulating part.

Generally, cracks are generated at the corners of the head portion of the insulator first, and electromagnetic waves propagate from the head portion of the insulator to the periphery along the head portion after entering the insulator, so that the electromagnetic waves preferentially propagate to the corners, and thus the cracks at the corners can be preferentially detected.

As an implementation manner, an included angle between the emission direction of the electromagnetic wave and the central axis of the suspension insulator is greater than 0 degree and less than 90 degrees.

Taking fig. 10 as an example, fig. 10 shows a case where the detection member is provided on the lower end face of the head portion of the insulator, and the detection member does not emit the electromagnetic wave directly against the head portion of the insulator but emits the electromagnetic wave 271 obliquely upward. This is done to allow the electromagnetic wave 271 to propagate distally within the interior of the insulator 210 by multiple reflections. The dielectric constant of the insulator 210 (e.g., ceramic) is typically relatively high compared to the cement or asphalt cement or other binder 240 surrounding the insulator 210, and the electromagnetic waves 271 propagate along the interior of the high dielectric constant material. For example, electromagnetic waves can propagate inside a high dielectric constant material by means of total reflection. If the boundary between the high-k material and the low-k material is encountered, the electromagnetic wave is reflected. This principle is similar to an optical fiber, and the inner fiber will continue to propagate along the fiber when the fiber is bent. Therefore, at the corner of the insulator 210, the electromagnetic wave 271 still propagates distally along the insulator 210. Based on the above principle, the reflection of electromagnetic waves can be used to detect cracks at any position inside the insulator.

When a crack 280 is formed in the insulator, the electromagnetic wave 271 is reflected when encountering the crack 280 to form a reflected wave 272, and the reflected wave 272 can be transmitted back to the detecting member 270. The detecting part 270 may determine whether there is a crack inside the insulator according to whether the reflected wave is changed.

The specific angle of the included angle between the emission direction of the electromagnetic wave and the central axis of the suspension insulator is not limited in the embodiment of the present application, and may be, for example, 45 degrees.

It is understood that the emitting direction of the 45-degree angle is only an example, and the specific angle can be selected according to the actual situation of the insulating member, as long as the electromagnetic wave can be ensured to propagate inside the insulating member, and the less the loss of the electromagnetic wave in the propagation process, the better.

The head of the insulating member 210 is circular in a top view, and the detecting member 270 may be disposed at a center of the circle as shown in fig. 11. The detection component 270 may include one antenna or may include a plurality of antennas.

Optionally, the antenna may be an omni-directional antenna or a directional antenna. For an omnidirectional antenna, if the transmitting power of the omnidirectional antenna is sufficient, a crack inside the whole suspension insulator can be detected by using one antenna.

If the antenna has a limited angle of transmission or reception, the entire dielectric member can be covered by providing a plurality of antennas. The plurality of antennas may emit or receive electromagnetic waves in different directions to detect different portions of the dielectric member.

The present application does not specifically limit the type of the plurality of antennas. For example, the plurality of antennas may respectively emit or receive electromagnetic waves in different directions to detect different portions of the insulator. For another example, the plurality of antennas may form a phased array or a Multiple Input Multiple Output (MIMO) array, and the equivalent transmission or reception directions of the plurality of antennas may be adjusted by an electrical scanning method to detect different portions of the insulator.

For the case that the detecting component includes a plurality of transmitting antennas, the present application does not specifically limit the transmitting modes of the plurality of transmitting antennas. The plurality of transmitting antennas may sequentially transmit the electromagnetic waves toward different directions, or the plurality of transmitting antennas may simultaneously transmit the electromagnetic waves toward different directions. Similarly, in the case where the detection means includes a plurality of receiving antennas, the plurality of receiving antennas may sequentially receive the electromagnetic waves in different directions, or may simultaneously receive the electromagnetic waves in different directions.

As an example, the plurality of transmitting antennas may sequentially transmit electromagnetic waves in different directions, and the plurality of receiving antennas may sequentially receive electromagnetic waves in different directions, so as to detect different portions of the insulator in the suspension insulator.

As yet another example, the plurality of transmitting antennas may sequentially transmit electromagnetic waves in different directions, and the plurality of receiving antennas may simultaneously receive electromagnetic waves in different directions to detect different portions of the insulator in the suspension insulator.

As yet another example, multiple transmitting antennas may transmit electromagnetic waves simultaneously in different directions, and multiple receiving antennas may sequentially receive electromagnetic waves in different directions in order to detect different portions of the insulator in the suspension insulator.

As yet another example, multiple transmitting antennas may transmit electromagnetic waves in different directions simultaneously, and multiple receiving antennas may receive electromagnetic waves in different directions simultaneously, so as to detect different portions of the insulator in the suspension insulator.

As yet another example, the plurality of transmit antennas and the plurality of receive antennas may form a phased array or a MIMO sparse array whose equivalent transmit direction and equivalent receive direction may be adjusted by an electrical scanning mechanism to detect different portions of the insulator in the suspension insulator.

For example, if the half-power beamwidth of the antenna is 90 degrees, 4 antennas may be used to cover the entire dielectric. Fig. 11 shows a case where the detection section 270 includes 4 antennas 275, and the 4 antennas 275 can emit electromagnetic waves toward different directions, respectively, to detect different portions of the insulating member.

Fig. 11 shows the case where an operating antenna emits electromagnetic waves, wherein the operating antenna is the antenna without shading in fig. 11. The 4 antennas 275 may emit electromagnetic waves simultaneously or sequentially, which is not specifically limited in this embodiment of the present application.

Each pair of transmitting antenna and receiving antenna in the embodiment of the application can be two independent antennas to form an antenna pair; or each pair of receive and transmit antennas may be combined into one antenna, i.e., the one antenna may both transmit and receive signals.

Taking fig. 11 as an example, if the transmitting antenna and the receiving antenna are combined into one antenna, the 4 antennas 275 can also be used to receive electromagnetic waves; the 4 antennas 275 can receive electromagnetic waves simultaneously or sequentially in different directions. Or, if the transmitting antenna and the receiving antenna are independent antennas, the detecting component may further include 4 receiving antennas, where one transmitting antenna and its corresponding receiving antenna form an antenna pair; the 4 receiving antennas can receive electromagnetic waves simultaneously or sequentially in different directions.

It is to be understood that the multiple transmitting antennas in the embodiments of the present application may be understood as multiple transmitting channels, and the multiple receiving antennas may be understood as multiple receiving channels. The multiple transmitting channels can be mutually independent, or can also form a phased array or a MIMO sparse array; the multiple receive channels may be independent of each other or may form a phased array or a MIMO sparse array.

In addition, the detection section may further include a transmission circuit corresponding to the transmission antenna, and a reception circuit corresponding to the reception antenna.

In addition to the above-described manner, in order to preferentially detect cracks at the corners of the insulator, the emission direction of the electromagnetic wave may also be set such that the electromagnetic wave is emitted toward the corners of the insulator to detect cracks at the corners.

The electromagnetic waves described above may include radio frequency waves, microwaves, millimeter waves, terahertz waves, and the like. Electromagnetic breaks may include different types of waves, according to different frequency division criteria.

Radio frequency waves, millimeter waves, and terahertz waves are all sometimes referred to as microwaves. The radio frequency band is 500MHz (5x 10)⁸Hz) to 30GHz (3x 10)¹⁰Hz), but sometimes waves having a frequency close to 30GHz, such as waves having a frequency of 28GHz, are also considered millimeter waves (5G millimeter waves now well known to the public include 28 GHz). The millimeter wave frequency band is from 30GHz to 300GHz (3x 10)¹¹Hz), also known as from 30GHz to 100GHz (1x 10)¹¹Hz). The terahertz frequency band is from 100GHz (1x 10)¹¹Hz) or 300GHz (3x 10)¹¹Hz) to 10THz (1x 10)¹³Hz).

Alternatively, the electromagnetic wave in the embodiment of the present application may be a millimeter wave, a radio frequency wave, or a terahertz wave. However, compared with millimeter waves and radio frequency waves, the higher the frequency of the terahertz waves, the shorter the wavelength, the wider the bandwidth that can be realized, and the more narrow the crack can be detected, so the detection accuracy of the terahertz waves on the crack is higher.

The terahertz wave has a higher frequency than the ultrasonic wave and the X-ray, and therefore, can provide more excellent distance and angle measurement accuracy. In addition, the terahertz detection module also has lower power consumption, and is favorable for saving cost.

The detection component in the embodiment of the application can be a detection module, and the detection module can comprise a detection chip, an antenna and a peripheral auxiliary component. The detection chip includes an electromagnetic wave sensor. The detection chip can be based on a silicon process, such as a Complementary Metal Oxide Semiconductor (CMOS) process, and main functional modules, such as a transmitter, a receiver, a signal generator, an echo signal processing unit, a power management unit, and the like, can be integrated on one chip, so that peripheral devices can be reduced, and the cost of the whole detection component can be reduced.

The detection device in the embodiment of the application can further determine the position of the crack in the insulating part in a manner similar to the principle of radar target distance measurement.

Common range radars may include pulsed radars and continuous wave radars.

The pulse radar emits a pulse wave, when the pulse wave is reflected by a target, the radar detects a returned pulse wave, and the distance between the target and the radar can be judged by comparing the time difference of the two pulse waves, because the propagation speed of the electromagnetic wave in the air or some medium is known.

Continuous wave fm radars emit a modulated wave of continuously varying frequency, such as a modulated wave of linearly varying frequency over time. When the transmitted wave is reflected back by the target, the radar detects a returned frequency modulation wave, and the distance between the target and the radar can be judged by comparing the transmitted wave with the returned wave to obtain a frequency difference.

According to the embodiment of the application, after the position of the crack in the insulator can be determined by utilizing the principle, an insulator manufacturer can determine the position of the crack which is easy to appear in the insulator by counting the crack position, and the manufacturing process of the insulator is improved based on the position.

If the embodiment is combined with the low-power-consumption wireless communication module, the detection result is transmitted back to the power grid control center, so that the insulator reliability monitoring system for unmanned inspection can be realized, and the power accident caused by insulator aging is reduced to the maximum extent.

The device embodiment of the present application is described in detail above, and the method embodiment of the present application is described below with reference to fig. 12, which can detect cracks inside an insulator on line, and avoid the problem of time and cost consumption caused by manual inspection. This method embodiment corresponds to the device embodiment described above, and the features not described can be referred to the description of the device embodiment above.

Fig. 12 shows a flow chart of a method for detecting a suspension insulator, where the method 800 includes steps S810-S820.

And S810, after the suspension insulator is installed on the power transmission line, controlling a detection part inside the suspension insulator to emit electromagnetic waves to an insulator of the suspension insulator.

And S820, receiving the reflected wave of the electromagnetic wave to detect whether cracks appear in the insulating piece.

Optionally, the controlling the detection component inside the suspension insulator to emit the electromagnetic wave to the insulator of the suspension insulator includes: and controlling the detection part to emit electromagnetic waves to the insulating part, so that the electromagnetic waves propagate to the umbrella body of the insulating part in the insulating part after entering the insulating part from the end face of the head part of the insulating part.

Optionally, the controlling the detecting part to emit the electromagnetic wave to the insulating member includes: and controlling the detection part to emit electromagnetic waves to the insulating part in a direction with an included angle between the detection part and the central axis of the suspension insulator being more than 0 degree and less than 90 degrees.

Optionally, the detection component is attached to a surface of an insulator in the suspension insulator.

Optionally, the detection component comprises a plurality of transmit and a plurality of receive antennas, the method further comprising:

controlling the plurality of transmitting antennas to sequentially transmit electromagnetic waves in different directions and the plurality of receiving antennas to sequentially receive electromagnetic waves in different directions so as to detect different parts of the insulating member in the suspension insulator; alternatively, the first and second electrodes may be,

controlling the plurality of transmitting antennas to simultaneously transmit electromagnetic waves in different directions and the plurality of receiving antennas to simultaneously receive electromagnetic waves in different directions so as to detect different parts of the insulator in the suspension insulator; alternatively, the first and second electrodes may be,

controlling the plurality of transmitting antennas to sequentially transmit electromagnetic waves in different directions and the plurality of receiving antennas to simultaneously receive the electromagnetic waves in different directions so as to detect different parts of the insulating member in the suspension insulator; alternatively, the first and second electrodes may be,

controlling the plurality of transmitting antennas to simultaneously transmit electromagnetic waves in different directions and the plurality of receiving antennas to sequentially receive the electromagnetic waves in different directions so as to detect different parts of the insulating member in the suspension insulator; alternatively, the first and second electrodes may be,

the multiple transmitting antennas and the multiple receiving antennas form a phased array or a multiple-input multiple-output (MIMO) sparse array, and the equivalent transmitting direction and the equivalent receiving direction of the phased array or the MIMO sparse array are adjusted through an electric scanning mechanism so as to detect different parts of the insulating piece in the suspension insulator.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modifications, equivalents and the like that are within the spirit and principle of the present application should be included in the scope of the present application.