Transformer on-load tap-changer transient electric field signal monitoring device
By designing a temporary electric field signal monitoring device for transformers with load connection and switch, the problem that the existing technology cannot judge the state of the mechanical structure in real time, and realize the real -time monitoring of the changes of the temporary electric field changes in the opening process. And evaluate the reliability of the transformer operation.
Patent Information
- Application Number
- CN202323480874.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-20
- Publication Date
- 2025-01-24
- Estimated Expiration
- 2033-12-20
AI Technical Summary
The existing transformer on-load tap-off switch status monitoring technology cannot judge the specific status of the mechanical structure breaking process in real time, resulting in the inability to effectively evaluate the changes in the transient electric field during the switching operation.
Design a transient electric field signal monitoring device for a transformer on-load tap changer, including a sensor unit, an optical transmission unit and a collection unit. The sensor unit is installed on the fixed flanges at both ends of the mechanical switch and is used to obtain transient electric field optical signals. The unit converts this into a digital electrical signal to evaluate the switch operating status.
A real -time monitoring of the temporary electric field change of the transformer has a transformer. It effectively evaluates the operating status of the switch and improves the reliability of the transformer operation.
Smart Images
Figure CN222394134U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of transformer on-load tap changers, and in particular to a transient electric field signal monitoring device for transformer on-load tap changers. Background Art
[0002] There are a large number of mechanical switch structures inside the transformer on-load tap changer. The on-load tap changer will perform a large number of switching operations during normal operation. Under long-term operation, there may be fatigue failure of the mechanical switch structure and switch malfunction, which is the main hidden danger threatening the normal operation of the transformer on-load tap changer. At present, the technologies for monitoring the status of on-load tap changers mainly include current monitoring technology, vibration monitoring technology, etc., which can only assist in macroscopic judgment and cannot judge the status of the specific mechanical structure breaking process. In fact, the switching operation process of the on-load tap changer will generate a large number of transient electric field signals. The process of the mechanical switch transitioning from the on state to the off state will cause a sudden change in the potential at both ends of the switch, causing transient electric field changes. Therefore, the existing transformer on-load tap changer status monitoring technology can only assist in macroscopic judgment and cannot judge the status of the specific mechanical structure breaking process. Utility Model Content
[0003] In view of the technical problems existing in the above-mentioned background technology, the utility model provides a transient electric field signal monitoring device for an on-load tap changer of a transformer.
[0004] According to one aspect of the present application, a transient electric field signal monitoring device for an on-load tap changer of a transformer is provided, comprising: a sensor unit, an optical transmission unit and a collection unit, wherein the sensor unit is mounted on fixed flanges at both ends of a mechanical switch in the on-load tap changer of the transformer, and is used to obtain a transient electric field optical signal of the on-load tap changer of the transformer during a disconnection process; the optical transmission unit is used to connect the sensor unit and the collection unit; the collection unit is used to convert the transient electric field optical signal transmitted by the optical transmission unit into a transient electric field digital electrical signal, wherein the transient electric field digital electrical signal is used to evaluate the operating status of the on-load tap changer of the transformer.
[0005] Optionally, the transformer on-load tap changer transient electric field monitoring device further includes: a terminal device for receiving the transient electric field digital electric signal of the acquisition unit, completing data storage and result display, and realizing real-time monitoring of the transformer on-load tap changer status.
[0006] Optionally, the sensor unit is composed of a collimator, a polarizer, a wave plate, an electro-optical crystal, and a reflector, wherein the collimator converts the light output by the optical transmission unit into spatial light and transmits it to the polarizer, the polarizer converts the spatial light beam into linearly polarized light and transmits it to the wave plate, the wave plate converts the linearly polarized light beam into circularly polarized light and transmits it to the electro-optical crystal, the electro-optical crystal converts the refractive index change under the action of the electric field into the polarization state change of the light beam, and converts the circularly polarized light into elliptically polarized light and transmits it to the reflector, and the reflector reflects the light beam back to the collimator along the original path and enters the optical transmission unit.
[0007] Optionally, the acquisition unit includes two analog input channels for receiving the transient electric field optical signal of the sensor unit and converting it into a transient electric field digital electrical signal.
[0008] Optionally, the acquisition unit further includes an external trigger channel for connecting to an external trigger source, and when an external trigger is required, the external trigger source controls the transient electric field signal acquisition start procedure.
[0009] Optionally, the collection unit further includes a communication channel for connecting to a terminal device to realize control of the collection unit and transmission of the collected transient electric field data.
[0010] Optionally, the acquisition unit further includes: a power supply channel for connecting to an external power supply.
[0011] Therefore, the present application provides a transient electric field monitoring device for a transformer on-load tap changer, which can provide real-time feedback on the transient electric field changes during the on-load tap changer switching process of the transformer by arranging a set of electric field sensing units, thus making up for the shortcomings of existing monitoring devices. The device can effectively evaluate the transient electric field during the on-load tap changer switching process of the transformer, provide a reference basis for the detection and maintenance strategy of the transformer on-load tap changer, and improve the operational reliability of the transformer on-load tap changer.
[0012] Based on the detailed description of the specific embodiments of the present application in combination with the accompanying drawings below, those skilled in the art will become more aware of the above and other purposes, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Hereinafter, some specific embodiments of the present application will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:
[0014] Figure 1 It is a structural schematic diagram of a transformer on-load tap changer transient electric field signal monitoring device provided according to an embodiment of the present application;
[0015] Figure 2is a schematic diagram of the structure of a sensor unit provided according to an embodiment of the present application;
[0016] Figure 3a and Figure 3b is a schematic diagram of the structure of a collection unit provided according to an embodiment of the present application;
[0017] Figure 4 It is a schematic diagram of the working process of the device for monitoring transient electric field signals of an on-load tap changer of a transformer provided in an embodiment of the present application. DETAILED DESCRIPTION
[0018] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0019] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.
[0020] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so as to describe the embodiments of the present invention described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.
[0021] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.
[0022] Figure 1 1 is a schematic diagram of the structure of a transformer on-load tap changer transient electric field signal monitoring device provided according to an embodiment of the present application. Figure 1 As shown, the transient electric field signal monitoring device of the transformer on-load tap changer includes: a sensor unit, an optical transmission unit and a collection unit, wherein the sensor unit is installed on the fixed flanges at both ends of the mechanical switch in the transformer on-load tap changer, and is used to obtain the transient electric field optical signal of the transformer on-load tap changer during the breaking process; the optical transmission unit is used to connect the sensor unit and the collection unit; the collection unit is used to convert the transient electric field optical signal transmitted by the optical transmission unit into a transient electric field digital electrical signal, wherein the transient electric field digital electrical signal is used to evaluate the operating state of the transformer on-load tap changer.
[0023] Optionally, the transformer on-load tap changer transient electric field monitoring device further includes: a terminal device for receiving the transient electric field digital electric signal of the acquisition unit, completing data storage and result display, and realizing real-time monitoring of the transformer on-load tap changer status.
[0024] Optionally, the sensor unit is composed of a collimator, a polarizer, a wave plate, an electro-optical crystal, and a reflector, wherein the collimator converts the light output by the optical transmission unit into spatial light and transmits it to the polarizer, the polarizer converts the spatial light beam into linearly polarized light and transmits it to the wave plate, the wave plate converts the linearly polarized light beam into circularly polarized light and transmits it to the electro-optical crystal, the electro-optical crystal converts the refractive index change under the action of the electric field into the polarization state change of the light beam, and converts the circularly polarized light into elliptically polarized light and transmits it to the reflector, and the reflector reflects the light beam back to the collimator along the original path and enters the optical transmission unit.
[0025] Optionally, the acquisition unit includes two analog input channels for receiving the transient electric field optical signal of the sensor unit and converting it into a transient electric field digital electrical signal.
[0026] Optionally, the acquisition unit further includes an external trigger channel for connecting to an external trigger source, and when an external trigger is required, the external trigger source controls the transient electric field signal acquisition start procedure.
[0027] Optionally, the collection unit further includes a communication channel for connecting to a terminal device to realize control of the collection unit and transmission of the collected transient electric field data.
[0028] Optionally, the acquisition unit further includes: a power supply channel for connecting to an external power supply.
[0029] Specifically, refer to Figure 1As shown, the transformer on-load tap-changer transient electric field monitoring device is composed of four parts: sensor unit 1, optical transmission unit 2, acquisition unit 3, and terminal device 4. The sensor unit is an electro-optical crystal and other supporting optical devices, which are used to measure the electric field signal and are responsible for converting the electric field signal into an optical fiber signal; the transmission unit is a polarization-maintaining optical fiber, which is used to transmit the optical fiber signal; the acquisition unit is responsible for completing the data acquisition; the terminal device is responsible for completing the parameter configuration (such as the device sampling rate, acquisition time, pre-trigger length, etc.), data storage and result display of the transformer on-load tap-changer transient electric field monitoring device.
[0030] refer to Figure 2 As shown, the sensor unit 1 is composed of a collimator 5, a polarizer 6, a wave plate 7, an electro-optical crystal 8, and a reflector 9. The collimator 5 converts the light output from the optical transmission unit 2 into spatial light and transmits it to the polarizer 6, the polarizer 6 converts the light beam into linearly polarized light and transmits it to the wave plate 7, the wave plate 7 converts the light beam into circularly polarized light and transmits it to the electro-optical crystal 8, the electro-optical crystal 8 converts the refractive index change under the action of the electric field into the polarization state change of the light beam, and converts the circularly polarized light into elliptically polarized light and transmits it to the reflector 9, and the reflector 9 reflects the light beam back to the collimator along the original path and enters the optical transmission unit 2.
[0031] refer to Figure 3a and Figure 3b As shown, the acquisition unit 3 includes two analog input channels 10, one external trigger channel 11, one communication channel 12 (which may be, but is not limited to, a USB communication channel) and one power supply channel 13 (which may be, but is not limited to, a DC power supply channel). The analog input channel 10 receives the signal of the sensor unit 1 and converts it into a digital signal; the external trigger channel 11 is connected to an external trigger source, and the acquisition start program is controlled by the external trigger source when an external trigger is required; the communication channel 12 is connected to the terminal device to realize the control of the acquisition unit 3 and the transmission of the collected data; the power supply channel 13 is externally connected to a power supply.
[0032] refer to Figure 4 As shown, the working process of the transient electric field monitoring device of the on-load tap changer of the transformer of the utility model of the present application is as follows: First, the sensor unit 1 is installed near the fixed contact of the switching switch inside the on-load tap changer of the transformer. After the sensor unit 1 is ready, the transient electric field monitoring device of the on-load tap changer of the present application enters the power-on self-test, system initialization and startup acquisition unit 3 in sequence, and then detects the steady-state working point of the sensor unit 1. If the steady-state working point of the sensor unit 1 is 0, it returns to the power-on self-test stage to reinitialize. If the steady-state working point of the sensor unit 1 is a non-zero value, the sensor unit 1 is normal, and enters the electric field data collection and data processing stage, and transmits the collected data to the terminal device to complete the data storage and display. After the completion of this test, if it is necessary to continue running, it returns to the electric field data collection stage, otherwise it exits.
[0033] Therefore, the present application provides a transient electric field monitoring device for a transformer on-load tap changer, which can provide real-time feedback on the transient electric field changes during the on-load tap changer switching process of the transformer by arranging a set of electric field sensing units, thus making up for the shortcomings of existing monitoring devices. The device can effectively evaluate the transient electric field during the on-load tap changer switching process of the transformer, provide a reference basis for the detection and maintenance strategy of the transformer on-load tap changer, and improve the operational reliability of the transformer on-load tap changer.
[0034] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values of the parts and steps described in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in one drawing, it does not need to be further discussed in subsequent drawings.
[0035] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.
[0036] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.
[0037] The above is only a preferred specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.
Claims
1. A transformer on-load tap changer transient electric field signal monitoring device, characterized in that: include: A sensor unit, an optical transmission unit and a collection unit, wherein the sensor unit is mounted on the fixing flanges at both ends of the mechanical switch in the transformer on-load tap changer, and is used to obtain the transient electric field optical signal of the transformer on-load tap changer during the breaking process; the optical transmission unit is used to connect the sensor unit and the collection unit; the collection unit is used to convert the transient electric field optical signal transmitted by the optical transmission unit into a transient electric field digital electrical signal, wherein the transient electric field digital electrical signal is used to evaluate the operating status of the transformer on-load tap changer.
2. The transformer on-load tap changer transient electric field signal monitoring device according to claim 1, characterized in that: Also includes: The terminal device is used to receive the transient electric field digital electrical signal from the acquisition unit, complete data storage and result display, and realize real-time monitoring of the transformer on-load tap changer status.
3. The transformer on-load tap changer transient electric field signal monitoring device according to claim 1, characterized in that: The sensor unit is composed of a collimator, a polarizer, a wave plate, an electro-optical crystal, and a reflector, wherein the collimator converts the light output by the optical transmission unit into spatial light and transmits it to the polarizer, the polarizer converts the spatial light beam into linearly polarized light and transmits it to the wave plate, the wave plate converts the linearly polarized light beam into circularly polarized light and transmits it to the electro-optical crystal, the electro-optical crystal converts the refractive index change under the action of the electric field into the polarization state change of the light beam, and converts the circularly polarized light into elliptically polarized light and transmits it to the reflector, and the reflector reflects the light beam back to the collimator along the original path and enters the optical transmission unit.
4. The transformer on-load tap changer transient electric field signal monitoring device according to claim 1, characterized in that: The acquisition unit includes two analog input channels for receiving the transient electric field optical signal of the sensor unit and converting it into a transient electric field digital electrical signal.
5. The transformer on-load tap changer transient electric field signal monitoring device according to claim 1, characterized in that: The acquisition unit also includes an external trigger channel for connecting to an external trigger source. When an external trigger is required, the external trigger source controls the transient electric field signal acquisition start procedure.
6. The transformer on-load tap changer transient electric field signal monitoring device according to claim 2, characterized in that: The acquisition unit also includes a communication channel for connecting to the terminal device to achieve control of the acquisition unit and transmission of the acquired transient electric field data.
7. The transformer on-load tap changer transient electric field signal monitoring device according to claim 1, characterized in that: The acquisition unit also includes: a power supply channel for connecting to an external power supply.