Switch cabinet discharge state monitoring device

Abstract

The invention relates to the technical field of power systems, in particular to a switch cabinet discharge state monitoring device which comprises an interferometer, a monitoring support, a monitoring sleeve, a DFB laser, a light intensity sensor, a laser receiver and a protective cover, the monitoring support is mounted on the top wall in a switch cabinet, the monitoring sleeve is hinged to the lower portion of the monitoring support, and the DFB laser is mounted on the lower portion of the monitoring support. The DFB laser is installed inside the monitoring sleeve, the light intensity sensor is installed on the monitoring support, the interferometer is located below the DFB laser, the laser receiver is arranged on the periphery of the interferometer in a sleeving mode, and the protective cover is installed below the monitoring support. According to the invention, by detecting the emission wavelength and emission track of the DFB laser and combining with a mode of monitoring the light intensity in the switch cabinet, the purpose of positioning the discharge assembly in the switch cabinet is achieved, and the phenomenon of misjudgment is effectively avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power systems, in particular to a switch cabinet discharge state monitoring device. BACKGROUND

[0002] The switch cabinet is a commonly used device in the power grid, which disconnects the circuit when necessary to ensure the stability and safety of power transmission, and is a key device for normal operation of the power grid.

[0003] The switch cabinet works continuously in the high-voltage power system, and has many internal components. Affected by uncontrollable factors, it may discharge. High temperature, strong light and harmful gas may be generated in the discharge moment, which may directly threaten personal safety. Therefore, it is necessary to monitor the discharge state during the actual use of the switch cabinet.

[0004] A common way to monitor the discharge state of the switch cabinet is to use the sensitivity of the distributed feedback laser (DFB laser) to vibration. Specifically, when the switch cabinet is in a discharge state, vibration will occur inside, which will change the wavelength of the laser emitted by the DFB laser to the interferometer. Through the analysis of the interferometer and related equipment, the severity of the discharge phenomenon can be analyzed through the change of the wavelength.

[0005] Using the above prior art, the discharge phenomenon of the switch cabinet can be monitored in the first time, and different measures can be taken according to the severity to eliminate the threat to personal safety. However, such monitoring technology can only passively ensure that the discharge phenomenon of the switch cabinet can be discovered in time, but it cannot determine the specific discharge component in the switch cabinet, so it is difficult to actively give a specific direction to avoid the discharge of the switch cabinet.

[0006] Therefore, a switch cabinet discharge state monitoring device is proposed. SUMMARY

[0007] The purpose of the present application is to provide a switch cabinet discharge state monitoring device, which solves the problem that the monitoring device cannot accurately locate the discharge component in the switch cabinet. By detecting the emission wavelength and emission trajectory of the DFB laser and combining the internal light intensity monitoring method of the switch cabinet, the purpose of locating the discharge component in the switch cabinet is achieved, and the misjudgment phenomenon is effectively avoided.

[0008] To achieve the above purpose, the present application provides the following technical scheme:

[0009] A switch cabinet discharge state monitoring device, comprising an interferometer, a monitoring support, a monitoring sleeve, a DFB laser, a light intensity sensor, a laser receiver and a protective cover; wherein,

[0010] The monitoring support is installed on the top wall inside the switch cabinet.

[0011] The monitoring sleeve is hinged below the monitoring support and is used to sense the vibration of the switch cabinet in the discharge state;

[0012] The DFB laser is installed inside the monitoring sleeve and is used to change the wavelength by changing the deformation of the DFB laser when the DFB laser receives the vibration of the monitoring sleeve;

[0013] The light intensity sensor is installed on the monitoring support and is used to monitor the strong light of the switch cabinet in the discharge state;

[0014] The interferometer is located below the DFB laser, and the receiving window of the interferometer is opposite to the emitting window of the DFB laser, and is used to receive the wavelength signal emitted by the DFB laser;

[0015] The laser receiver is sleeved on the periphery of the interferometer and is used to receive the emitting light spot of the DFB laser and simulate the motion track of the emitting light spot of the DFB laser;

[0016] The protective cover is installed below the monitoring support and is used to provide a darkroom environment for the interferometer and the laser receiver;

[0017] The discharge state includes that the wavelength signal received by the interferometer changes or the motion track simulated by the laser receiver changes, and the monitoring light intensity of the light intensity sensor reaches the preset value; the double determination of the light intensity sensor and the interferometer or the laser receiver avoids the misjudgment phenomenon of the non-strong light or vibration inside the switch cabinet, and only when the above conditions are met at the same time, it is determined that the switch cabinet is in the discharge state, and then the related operation is performed.

[0018] Preferably, a buffer section is arranged above the monitoring support, the buffer section is connected to the top wall inside the switch cabinet, and the buffer section is composed of a vibration damping material;

[0019] In the above scheme, by arranging the buffer section, the vibration of the switch cabinet in the discharge state is transmitted from the vibration source to the DFB laser through the switch cabinet entity, and the transmission medium of the vibration is unified as the gas inside the switch cabinet, so that the vibration is propagated along a straight line from the vibration source to the DFB laser, thereby the direction of the vibration source relative to the DFB laser can be inferred from the vibration direction of the DFB laser, and the distance between the vibration source and the DFB laser can be calculated in cooperation with the light intensity sensor, so as to locate the specific discharge component.

[0020] Preferably, a connecting groove is formed below the monitoring support, the connecting groove is a spherical structure, the upper end of the monitoring sleeve is provided with a connecting head, the connecting head is provided as a spherical structure matched with the connecting groove, the upper end surface of the DFB laser is flush with the surface of the connecting head, the DFB laser comprises laser terminals, a plurality of the laser terminals are embedded in the upper end surface of the DFB laser, an equal number of connecting terminals to the laser terminals are embedded in the connecting groove, and the connecting terminals are attached to the laser terminals.

[0021] In the above scheme, the upper end surface of the DFB laser is flush with the surface of the connecting head, that is, the upper end surface of the DFB laser is in an arc-shaped structure, thereby, when the DFB laser is inserted into the monitoring sleeve, the structure can play a guiding role to simplify the installation process; the cooperation of the connecting head and the connecting groove forms a universal connection between the monitoring support and the monitoring sleeve, thereby, when the monitoring sleeve is subjected to vibration sound waves in any direction, the DFB sensor can be driven to vibrate in the same direction; in addition, through the attachment of the connecting terminals and the laser terminals, it is not necessary to arrange wires inside the monitoring sleeve, so that the DFB laser remains vertical under the condition of force balance, thereby ensuring the accuracy of the feedback of the DFB when subjected to sound waves.

[0022] Preferably, a plurality of the laser terminals are arranged in a ring array around the central axis of the DFB laser, and the area of the laser terminal is smaller than that of the connecting terminal.

[0023] In the above scheme, the ring array of the laser terminals further ensures that the DFB laser is in a vertical state under the condition of force balance, so as to ensure the accuracy of the feedback of the DFB when subjected to sound waves; as for the area of the laser terminal being smaller than that of the connecting terminal, the two are always in contact, while reducing the manufacturing cost of the monitoring device: compared with the DFB laser, the monitoring support can be reused, so that the smaller area of the laser terminal makes the manufacturing cost of the DFB laser lower.

[0024] Preferably, the monitoring sleeve is provided in a cylindrical structure, the monitoring sleeve is provided with an installation channel inside, and the DFB laser is installed in the installation channel.

[0025] In the above scheme, the cylindrical structure of the monitoring sleeve ensures that the stress surface remains consistent when it receives vibration sound waves in various directions, thereby ensuring the accuracy of the monitoring results.

[0026] Preferably, a protective mirror is arranged below the installation channel, and the protective mirror is provided as a convex lens structure.

[0027] Preferably, the protective cover wraps the monitoring sleeve, the interferometer and the laser receiver, and the protective cover is composed of a light-absorbing material.

[0028] The base function of the protective cover is to provide the installation position of the interferometer and the laser receiver and prevent dust from entering, thereby avoiding the influence of dust on the detection accuracy, and the additional function is to shield the strong light of the switch cabinet discharge from interfering with the interferometer and the laser receiver, thereby further ensuring the detection accuracy.

[0029] Preferably, the light intensity sensor is arranged outside the protective cover, and the light intensity sensor is installed on the side of the monitoring support close to the equipment in the switch cabinet, so that the light intensity sensor faces the equipment in the switch cabinet, and when the switch cabinet discharges, the strong light generated directly irradiates the light intensity sensor, thereby ensuring the monitoring accuracy.

[0030] Compared with the prior art, the present application has the following advantages:

[0031] 1. The switch cabinet discharge state monitoring device provided by the present application solves the technical problem that the prior art can only monitor the occurrence of discharge but cannot determine the position of the specific discharge component. By combining the vibration detection of the DFB laser wavelength and the emission trajectory with the light intensity monitoring inside the switch cabinet, a "light-sound" cooperative monitoring system is constructed, which not only confirms the occurrence of discharge, but also accurately locates the discharge component inside the switch cabinet, realizes the leap from passive monitoring to active positioning, and effectively avoids misjudgment caused by external vibration or internal non-discharge strong light.

[0032] 2. The present application realizes accurate positioning of the discharge component, and the relevance is reflected in the following aspects: first, the light intensity sensor is used to capture the strong light generated at the moment of discharge, which is used as the "zero time" reference (t1) of the occurrence of discharge and as a reliable trigger signal for starting positioning calculation; second, the laser receiver accurately determines the propagation direction of the discharge sound source by simulating the trajectory change of the DFB laser caused by the vibration sound wave; finally, by calculating the time difference between the light signal (t1) and the time (t2, t3) when the sound wave signal is captured by the interferometer or the laser receiver, and combining the sound speed, the distance between the monitoring device and the discharge component can be accurately calculated. By combining the information of "direction" and "distance" in two dimensions, the specific spatial position of the discharge component in the switch cabinet can be locked, which provides an accurate basis for predictive maintenance.

[0033] 3, The final confirmation of the discharge state needs the two conditions of "light intensity excess" and "vibration occurrence" (wavelength or trajectory change) to be met at the same time, and this double verification mechanism effectively filters out the simple mechanical vibration interference of the switch cabinet caused by external force impact, or the non-discharge light interference caused by external light source; in addition, the spherical hinged structure of the monitoring sleeve and the monitoring support ensures that the DFB laser can sensitively respond to vibration from any direction, and the protective cover made of light-absorbing material creates an ideal darkroom environment for the interferometer and the laser receiver, shielding the interference of the discharge strong light on vibration measurement, and ensuring the accuracy and reliability of the positioning data. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 It is the overall installation schematic diagram of the present application;

[0035] Figure 2 It is the overall internal structure schematic diagram of the present application;

[0036] Figure 3 It is the overall internal structure schematic diagram of the present application; Figure 2 It is the enlarged schematic diagram of part A of the present application;

[0037] Figure 4 It is the enlarged schematic diagram of part C of the present application; Figure 2 It is the enlarged schematic diagram of part C of the present application;

[0038] Figure 5 It is the monitoring sleeve and DFB laser structure schematic diagram of the present application;

[0039] Figure 6 It is the monitoring support structure schematic diagram of the present application;

[0040] Figure 7 It is the monitoring structure schematic diagram of the present application;

[0041] Figure 8 It is the working process schematic diagram of the present application.

[0042] In the figure: 1, monitoring support; 11, buffer section; 12, connecting groove; 121, connecting terminal; 2, monitoring sleeve; 21, connecting head; 22, installation channel; 23, protective mirror; 3, DFB laser; 31, laser terminal; 4, light intensity sensor; 5, laser receiver; 6, interferometer; 7, protective cover. DETAILED DESCRIPTION

[0043] 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. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0044] Referring to Figures 1 to 8 The application provides a switch cabinet discharge state monitoring device, and the technical scheme is as follows:

[0045] A switch cabinet discharge state monitoring device, comprising an interferometer 6, a monitoring support 1, a monitoring sleeve 2, a DFB laser 3, a light intensity sensor 4, a laser receiver 5 and a protective cover 7, wherein,

[0046] The monitoring support 1 is installed on the top wall inside the switch cabinet.

[0047] The monitoring sleeve 2 is hingedly connected below the monitoring support 1 and is used for sensing the vibration of the switch cabinet in the discharge state.

[0048] The DFB laser 3 is installed inside the monitoring sleeve 2 and is used for receiving the vibration of the monitoring sleeve 2 to deform itself and change the emission wavelength through the deformation; the DFB laser 3 is rigidly pasted on the inner wall of the installation channel 22 by high-hardness epoxy resin glue, when the monitoring sleeve 2 is bent and deformed due to the sound wave vibration, the deformation is directly converted into tensile or compressive stress on the shell and the internal chip of the DFB laser 3 through the rigid connection, so that the resonant wavelength of the DFB laser 3 changes in proportion to the vibration intensity.

[0049] The light intensity sensor 4 is installed on the monitoring support 1, the light intensity sensor 4 is arranged outside the protective cover 7, and the light intensity sensor 4 is installed on the side of the monitoring support 1 close to the equipment inside the switch cabinet, and is used for monitoring the strong light in the discharge state of the switch cabinet.

[0050] The interferometer 6 is located below the DFB laser 3, and the receiving window of the interferometer 6 is opposite to the emission window of the DFB laser 3, and is used for receiving the wavelength signal emitted by the DFB laser 3.

[0051] The laser receiver 5 is sleeved on the periphery of the interferometer 6 and is used for receiving the emission point of the DFB laser 3 and simulating the motion track of the emission point of the DFB laser 3 to determine the direction of the vibration source relative to the DFB laser 3, and the determination steps are as follows:

[0052] 1) The laser receiver 5 records the base point coordinates (x0, y0) of the light point in the static state;

[0053] 2) When the track starts to change at t2, the coordinates (x1, y1), (x2, y2)... (xn, yn) of the next N sampling points (for example, N=10) are recorded;

[0054] 3) The initial displacement vector V from (x0, y0) to the first displacement point (x1, y1) is calculated.

[0055] 4) The direction of the vector V is the vibration direction of the DFB laser 3, and the direction of the discharge sound source is opposite to the direction of the vector, and the accurate direction angle can be calculated by the arctangent function atan2(y1-y0, x1-x0).

[0056] A protective cover 7 is installed below the monitoring support 1, the protective cover 7 wraps the monitoring sleeve 2, the interferometer 6 and the laser receiver 5, and the protective cover 7 is composed of a light-absorbing material, such as black silicone rubber filled with mixed carbon, for providing a darkroom environment for the interferometer 6 and the laser receiver 5;

[0057] The discharge state includes that the wavelength signal received by the interferometer 6 changes (specifically, the drift amount of the wavelength emitted by the DFB laser 3 detected by the interferometer 6 within 10 milliseconds exceeds a certain length, or the change rate dλ / dt exceeds a certain preset threshold), or the movement trajectory simulated by the laser receiver 5 changes (specifically, the displacement speed of the light spot detected by the laser receiver 5 exceeds 5 mm / s, or the displacement amount within a single vibration period exceeds 0.5 mm); and the monitored light intensity of the light intensity sensor 4 reaches a preset value (the preset value of the light intensity sensor 4 is set according to the typical working environment of the switch cabinet, and the preferred range is 5000 lux to 15000 lux, which is higher than the normal environmental light and conventional lighting interference, but can effectively capture the transient arc light generated by the initial insulation breakdown); the double determination of the light intensity sensor 4 and the interferometer 6 or the laser receiver 5 avoids the misjudgment phenomenon of non-switch cabinet internal strong light or vibration, and only when the above conditions are met at the same time, the switch cabinet is determined to be in a discharge state, and then related operations are performed.

[0058] As an embodiment of the present application, referring to Figure 1 and Figure 2 , the monitoring support 1 is provided in a circular table structure, a buffer section 11 is arranged above the monitoring support 1, the buffer section 11 is connected to the top wall inside the switch cabinet, and the buffer section 11 is composed of a buffer material; preferably, the buffer section 11 is made of PEEK material, which has excellent high temperature resistance, impact resistance and radiation resistance, and can better meet the use environment of the device;

[0059] The principle and process of positioning the discharge component are as follows: in the switch cabinet, the time of light short distance propagation is negligible, that is, the light intensity sensor 4 monitors the set light intensity and the switch cabinet discharge state is synchronized, at this time, only the time difference between the time when the interferometer 6 receives the wavelength change (or the time when the laser receiver 5 simulates the trajectory change) and the time when the light intensity sensor 4 sends out the signal is calculated, and the time difference is multiplied by the speed of sound propagation in air to obtain the distance of sound wave propagation, that is, the distance between the vibration source and the DFB laser 3. Specifically, when the light intensity sensor 4 captures excessive light, it is defined as t1 time; when the interferometer 6 monitors the change of laser wavelength, it is defined as t2 time; when the laser receiver 5 simulates the change of trajectory, it is defined as t3 time; in the calculation, the minimum value of t2 and t3 is taken, the difference between the minimum value and t1 is calculated, and then the difference is multiplied by the sound speed v (the sound speed v is set to the theoretical value of 346 meters per second under the standard working temperature of the switch cabinet, which is prewritten into the memory of the control unit), to obtain the distance between the vibration source and the DFB laser 3; combining the distance with the vibration direction analyzed from the simulated trajectory of the laser receiver 5, the specific discharge component can be located.

[0060] As an embodiment of the present application, with reference to Figure 2 、 Figure 3 and Figure 6 , the lower part of the monitoring support 1 is provided with a connecting groove 12, the connecting groove 12 is a spherical structure, the monitoring sleeve 2 is provided in a cylindrical structure, the monitoring sleeve 2 is provided with an installation channel 22 inside, the DFB laser 3 is installed in the installation channel 22, the upper end of the monitoring sleeve 2 is provided with a connecting head 21, the connecting head 21 is provided in a spherical structure matched with the connecting groove 12, the upper end surface of the DFB laser 3 is flush with the surface of the connecting head 21, the DFB laser 3 includes laser terminals 31, a plurality of laser terminals 31 are embedded in the upper end surface of the DFB laser 3, an equal number of connecting terminals 121 as the laser terminals 31 are embedded in the connecting groove 12, and the connecting terminals 121 are attached to the laser terminals 31;

[0061] In this method, four connection terminals 121 and four laser terminals 31 are provided. To facilitate the installation of the connector 21 in the connection slot 12, the monitoring support 1 adopts a split-half structure. It should be noted that in order to ensure the installation accuracy of the connection terminal 121, the dividing line should pass through the adjacent gap between the mounting holes of the connection terminal 121. In addition, in this invention, the DFB laser 3, interferometer 6, laser receiver 5 and light intensity sensor 4 all need to be powered by an external power source. Specifically, the laser terminal 31 of the DFB laser 3 is attached to the connection terminal 121, and a wire is connected above the connection terminal 121. The wire passes through the reserved hole above the switch cabinet, thereby completing the power supply for the DFB laser 3. The wires of the interferometer 6 and the laser receiver 5 pass through the inside of the protective cover 7 and the inside of the monitoring support 1, and also pass out through the reserved hole of the switch cabinet. The wire of the light intensity sensor 4 passes through the monitoring support 1 and exits through the reserved hole of the switch cabinet. Correspondingly, the signal input / output line settings are consistent.

[0062] Furthermore, the monitoring support 1 integrates a microprocessor unit, which includes: a high-speed digital input port for receiving trigger signals from the light intensity sensor 4, an analog-to-digital converter (ADC) for receiving data from the interferometer 6 and the laser receiver 5, and a serial communication interface. The microprocessor unit has a built-in high-precision clock for timestamping all received signals and built-in firmware for execution. Figure 8 The logical judgment and distance calculation formula shown are output through the onboard RS485 interface.

[0063] As one embodiment of the present invention, refer to Figure 3 and Figure 5 Multiple laser terminals 31 are arranged in a ring array around the central axis of the DFB laser 3 on the DFB laser 3, and the area of ​​the laser terminals 31 is smaller than the area of ​​the connecting terminals 121.

[0064] Preferably, the laser terminal 31 and the connection terminal 121 are made of phosphor bronze or beryllium bronze, and all terminals are made of the same material. This ensures that the DFB laser 3 is in a vertical position when under force balance, and also ensures the stability of the electrical connection. In addition to having excellent electrical connection performance, these two materials also have excellent wear resistance and corrosion resistance, thus ensuring the long-term effectiveness of the monitoring device.

[0065] As one embodiment of the present invention, refer to Figure 4 A protective mirror 23 is provided below the installation channel 22, and the protective mirror 23 is configured as a convex lens structure;

[0066] The basic function of the protective mirror 23 is to protect the DFB laser 3 inside the installation channel 22, and its additional effect is to amplify the laser spot emitted by the DFB laser 3 by using its convex lens structure, and then the laser emitted by the DFB laser 3 can be shot into the interferometer 6 to judge the strength of the vibration through wavelength analysis, so as to judge the severity of the switch cabinet discharge; and can also be projected to the receiver to simulate the vibration trajectory of the DFB laser 3, and then the vibration direction of the DFB laser 3 is judged, so as to determine the vibration source when the switch cabinet discharges.

[0067] Working principle: In order to accurately locate the specific position of the discharge component while monitoring the switch cabinet discharge phenomenon, and effectively avoid misjudgment, the application constructs a working system combining "light-sound" cooperative monitoring and double determination logic (refer to Figure 7 );

[0068] Specifically, referring to Figure 8 , when a component in the switch cabinet discharges, it will instantaneously generate two physical signals of strong light and vibration sound waves. The light intensity sensor 4 at the top of the device first captures the strong light signal with extremely fast propagation speed, which is used as the "zero time" reference (t1) of the discharge occurrence and triggers the determination program; at the same time, the vibration sound wave with slower propagation speed is inducted by the monitoring sleeve 2, causing the internal DFB laser 3 to displace and deform, and this vibration information is analyzed through two parallel routes: the laser receiver 5 judges the direction of the sound source by simulating the motion trajectory of the laser spot; the interferometer 6 evaluates the strength of the vibration by analyzing the change of the wavelength emitted by the DFB laser 3; finally, the external control center combines the direction and intensity information, and calculates the distance through the time difference between the arrival of the light signal and the sound signal, so as to lock the spatial coordinates of the discharge component and achieve accurate positioning.

[0069] In order to accurately judge the spatial coordinates (i.e. direction and distance) of the discharge component, the specific way is: in the direction judgment, the laser receiver 5 is sleeved outside the interferometer 6, which is used to receive and track the laser spot projected by the DFB laser 3; when the vibration sound wave generated by the discharge causes the monitoring sleeve 2 to swing, the DFB laser 3 also swings synchronously, and the motion trajectory of the light spot emitted by the DFB laser 3 on the laser receiver 5 directly simulates the direction of the vibration, and the direction of the sound source can be deduced by analyzing the trajectory; in the distance calculation, the light intensity sensor 4 records the time when the light intensity exceeds as t1, and the interferometer 6 or the laser receiver 5 records the time when the signal starts to change as the arrival time of the sound wave (t2, t3); since the speed of light is much greater than the speed of sound, the light propagation time can be ignored, so the distance between the discharge point and the monitoring device can be calculated by the formula "distance = [min(t2, t3) - t1] x v (sound speed)".

[0070] In order to ensure the sensitivity and accuracy of vibration monitoring and effectively avoid environmental interference, the specific way is: in the structure design, the connecting head 21 on the upper end of the monitoring sleeve 2 and the connecting groove 12 below the monitoring support 1 form a spherical hinge (universal joint structure), which makes the monitoring sleeve 2 be able to respond to vibration sound waves from any direction without difference, ensuring the monitoring without dead angle; At the same time, the buffer section 11 arranged above the monitoring support 1 can effectively absorb and isolate the structural vibration from the switch cabinet body itself, ensuring that the device is only sensitive to the air sound wave generated by the discharge; In the judgment logic, the system sets double trigger conditions, that is, only when the light intensity sensor 4 sends an excess signal and the interferometer 6 or the laser receiver 5 detects vibration, it is judged as effective discharge; This double verification of "light" and "sound" can effectively exclude false alarms caused by single events such as impact on the switch cabinet (only vibration) or strong light irradiation during maintenance (only light intensity), greatly improving the reliability of the monitoring; In addition, the protective cover 7 made of light-absorbing material provides a stable darkroom environment for the interferometer 6 and the laser receiver 5, avoiding the interference of discharge light on optical measurement, further ensuring the accuracy of the data.

[0071] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A switchgear discharge status monitoring device, comprising an interferometer (6), characterized in that: It also includes a monitoring support (1), a monitoring sleeve (2), a DFB laser (3), a light intensity sensor (4), a laser receiver (5), and a protective cover (7); among which, The monitoring support (1) is installed on the top wall inside the switch cabinet; The monitoring sleeve (2) is hinged below the monitoring support (1) and is used to sense the vibration of the switch cabinet discharge state. The DFB laser (3) is installed inside the monitoring sleeve (2) to receive the vibration of the monitoring sleeve (2) and deform itself, and change the emission wavelength through its own deformation; The light intensity sensor (4) is installed on the monitoring support (1) and is used to monitor the strong light of the switch cabinet discharge state; The interferometer (6) is located below the DFB laser (3), and the receiving window of the interferometer (6) faces the transmitting window of the DFB laser (3) to receive the wavelength signal emitted by the DFB laser (3). The laser receiver (5) is fitted around the interferometer (6) to receive the emitted light spot of the DFB laser (3) and simulate the motion trajectory of the emitted light spot of the DFB laser (3). The protective cover (7) is installed below the monitoring support (1) to provide a darkroom environment for the interferometer (6) and the laser receiver (5); The discharge states include: the wavelength signal received by the interferometer (6) changes, or the motion trajectory simulated by the laser receiver (5) changes; and the monitoring light intensity of the light intensity sensor (4) reaches a preset value.

2. The switchgear discharge status monitoring device according to claim 1, characterized in that: A buffer section (11) is provided above the monitoring support (1). The buffer section (11) is connected to the top wall inside the switch cabinet and is made of vibration damping material.

3. The switchgear discharge status monitoring device according to claim 2, characterized in that: A connecting groove (12) is provided below the monitoring support (1). The connecting groove (12) is a spherical structure. A connector (21) is provided at the upper end of the monitoring sleeve (2). The connector (21) is a spherical structure that cooperates with the connecting groove (12). The upper surface of the DFB laser (3) is flush with the surface of the connector (21). The DFB laser (3) includes laser terminals (31). Multiple laser terminals (31) are embedded in the upper surface of the DFB laser (3). The connecting groove (12) contains an equal number of connecting terminals (121) as the laser terminals (31). The connecting terminals (121) are in contact with the laser terminals (31).

4. The switchgear discharge status monitoring device according to claim 3, characterized in that: Multiple laser terminals (31) are arranged in a ring around the central axis of the DFB laser (3) on the DFB laser (3), and the area of ​​the laser terminals (31) is smaller than the area of ​​the connecting terminals (121).

5. The switchgear discharge status monitoring device according to claim 1, characterized in that: The monitoring sleeve (2) is configured as a cylindrical structure, and an installation channel (22) is provided inside the monitoring sleeve (2). The DFB laser (3) is installed inside the installation channel (22).

6. The switchgear discharge status monitoring device according to claim 5, characterized in that: A protective mirror (23) is provided below the installation channel (22), and the protective mirror (23) is configured as a convex lens structure.

7. The switchgear discharge status monitoring device according to claim 1, characterized in that: The protective cover (7) encloses the monitoring sleeve (2), the interferometer (6) and the laser receiver (5), and the protective cover (7) is made of light-absorbing material.

8. The switchgear discharge status monitoring device according to claim 7, characterized in that: The light intensity sensor (4) is located outside the protective cover (7), and the light intensity sensor (4) is installed on the side of the monitoring support (1) near the equipment inside the switch cabinet.

Images