Transformer on-load tap-changer high-frequency current signal monitoring device

Abstract

The utility model discloses a transformer on-load tap-changer high-frequency current signal monitoring device, which comprises a power frequency current sensor, a high-frequency current sensor and a high-speed acquisition unit, and is characterized in that the power frequency current sensor is mounted in a transformer on-load tap-changer operating mechanism box and is connected with the high-speed acquisition unit through a coaxial cable; the acquisition module is used for acquiring a power frequency current signal of the on-load tap-changer of the transformer and judging whether the on-load tap-changer of the transformer has a switching action or not; the high-frequency current sensor is mounted at a clamp grounding wire of the transformer and is used for sensing high-frequency current signals of moving and static contacts in the switching process of the on-load tap-changer; and the high-speed acquisition unit is used for receiving the power frequency current signal and triggering the high-frequency current sensor to begin to acquire a high-frequency current signal of the transformer on-load tap-changer in the whole switching period under the condition of judging that the on-load tap-changer has the switching action, and the high-frequency current signal is used for evaluating the state of the transformer on-load tap-changer.

Description

Technical Field

[0001] The present application relates to the technical field of transformer on-load tap changers, and in particular to a high-frequency current signal monitoring device for transformer on-load tap changers. Background Art

[0002] On-load tap changer (OLTC) is an important part of on-load tap-changing transformer. Under transformer load or excitation conditions, the output voltage can be adjusted online by changing the winding tapping position of OLTC, thereby ensuring the stable operation of the power system. The collision and friction between the moving and static contacts of OLTC will generate mechanical vibration and electromagnetic signals. The time series of these signals contain rich characteristic information. By analyzing the signals, fault monitoring of OLTC can be realized. Existing research basically focuses on vibration signals, and there is little research on electromagnetic signals, resulting in the neglect of important information contained in electromagnetic signals. Therefore, monitoring the electromagnetic signals of the switching process of the on-load tap changer of the transformer and evaluating the OLTC status have become technical problems that need to be solved urgently. Utility Model Content

[0003] In view of the technical problems existing in the above-mentioned prior art, the utility model provides a high-frequency current signal monitoring device for an on-load tap changer of a transformer.

[0004] According to one aspect of the present application, a high-frequency current signal monitoring device for an on-load tap changer of a transformer is provided, comprising: an industrial frequency current sensor, a high-frequency current sensor, and a high-speed acquisition unit, wherein the industrial frequency current sensor is installed in an operating mechanism box of the on-load tap changer of the transformer and is connected to the high-speed acquisition unit via a coaxial cable, and is used to acquire the industrial frequency current signal of the on-load tap changer of the transformer and determine whether the on-load tap changer of the transformer has a switching action; the high-frequency current sensor is installed at the clamp grounding wire of the transformer and is used to sense the high-frequency current signal of the moving and static contacts during the switching process of the on-load tap changer; the high-speed acquisition unit is used to receive the industrial frequency current signal and, when it is determined that the on-load tap changer has a switching action, trigger the high-frequency current sensor to start acquiring the high-frequency current signal of the on-load tap changer of the transformer during the entire switching period, wherein the high-frequency current signal is used for status evaluation of the on-load tap changer of the transformer.

[0005] Optionally, the transformer on-load tap changer high-frequency current signal monitoring device further includes: a detection and amplification unit arranged between the high-frequency current sensor and the high-speed acquisition unit, for amplifying and detecting the high-frequency current signal.

[0006] Optionally, the transformer on-load tap changer high-frequency current signal monitoring device further includes: a power supply module, used to supply power to the detection and amplification unit.

[0007] Optionally, the transformer on-load tap changer high-frequency current signal monitoring device further includes: a storage control unit, which is used to receive the high-frequency current signal from the high-frequency acquisition unit, and store the high-frequency current signal and display the result.

[0008] Optionally, the power module, the high-speed acquisition unit and the storage control unit are placed in a preset constant temperature monitoring system chassis, and the constant temperature monitoring system chassis has the function of shielding external electromagnetic interference.

[0009] Therefore, the high-frequency current signal monitoring device for the transformer on-load tap changer provided in the present application monitors the high-frequency current signals generated by the action of the moving and static contacts during the switching process of the transformer on-load tap changer through a high-frequency current sensor, thereby making up for the deficiency that the existing monitoring technology cannot perceive the high-frequency current signals during the switching process of the transformer on-load tap changer, and improving the equipment status perception.

[0010] 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

[0011] 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:

[0012] Figure 1 is a structural diagram of a high-frequency current signal monitoring device for an on-load tap changer of a transformer provided in an embodiment of the present application;

[0013] Figure 2 It is a schematic diagram of the arrangement of a high-frequency current signal monitoring device for an on-load tap changer of a transformer provided in an embodiment of the present application;

[0014] Figure 3 It is a working flow chart of the high-frequency current signal monitoring device of the transformer on-load tap changer provided in the embodiment of the present application. DETAILED DESCRIPTION

[0015] 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.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] Figure 1 1 is a schematic diagram of the structure of a high-frequency current signal monitoring device for an on-load tap changer of a transformer according to an embodiment of the present application. Figure 1 As shown, the high-frequency current signal monitoring device for the on-load tap changer of the transformer is characterized in that it includes: an industrial frequency current sensor, a high-frequency current sensor, and a high-speed acquisition unit, wherein the industrial frequency current sensor is installed in the operating mechanism box of the on-load tap changer of the transformer, and is connected to the high-speed acquisition unit through a coaxial cable, and is used to collect the industrial frequency current signal of the on-load tap changer of the transformer, and judge whether the on-load tap changer of the transformer has a switching action; the high-frequency current sensor is installed at the clamp grounding wire of the transformer, and is used to sense the high-frequency current signal of the moving and static contacts during the switching process of the on-load tap changer; the high-speed acquisition unit is used to receive the industrial frequency current signal, and when it is determined that the on-load tap changer has a switching action, trigger the high-frequency current sensor to start collecting the high-frequency current signal of the entire switching period of the on-load tap changer of the transformer, wherein the high-frequency current signal is used for status evaluation of the on-load tap changer of the transformer.

[0020] Optionally, the transformer on-load tap changer high-frequency current signal monitoring device further includes: a detection and amplification unit arranged between the high-frequency current sensor and the high-speed acquisition unit, for amplifying and detecting the high-frequency current signal.

[0021] Optionally, the transformer on-load tap changer high-frequency current signal monitoring device further includes: a power supply module, used to supply power to the detection and amplification unit.

[0022] Optionally, the transformer on-load tap changer high-frequency current signal monitoring device further includes: a storage control unit, which is used to receive the high-frequency current signal from the high-frequency acquisition unit, and store the high-frequency current signal and display the result.

[0023] Optionally, the power module, the high-speed acquisition unit and the storage control unit are placed in a preset constant temperature monitoring system chassis, and the constant temperature monitoring system chassis has the function of shielding external electromagnetic interference.

[0024] Specifically, refer to Figure 1 As shown, the transformer on-load tap changer high-frequency current signal monitoring device is composed of a power frequency current sensor, a high-frequency current sensor, a detection and amplification unit, a high-speed acquisition unit, a storage control unit, a power module, etc. The power frequency current sensor is used to detect whether the transformer on-load tap changer is in operation; the high-frequency current sensor is used to sense the electromagnetic signals of the moving and static contacts during the switching process of the transformer on-load tap changer; the detection and amplification unit is used to amplify and detect the high-frequency current signal; the high-speed acquisition unit is used to collect the processed high-frequency current signal; and the storage control unit is used for data storage, analysis and result display.

[0025] refer to Figure 2 As shown, the power frequency current sensor is installed in the transformer on-load tap-changer operating mechanism box, and the high-frequency current sensor is installed at the grounding wire of the transformer clamp. The power frequency current sensor is connected to the trigger input channel of the high-speed acquisition unit via a coaxial cable. The high-frequency current sensor is connected to the acquisition channel of the high-speed acquisition unit via an amplification detection unit. The power module, high-speed acquisition unit and storage control unit are placed in the constant temperature monitoring system chassis to provide a constant temperature working environment and shield external electromagnetic interference. The 220V mains power is used to power the power module, high-speed acquisition unit and storage control unit.

[0026] exist Figure 3In the article, the working process of the high-frequency current signal monitoring device for the transformer on-load tap changer of the utility model is introduced: the power frequency current sensor collects the power frequency current signal of the transformer on-load tap changer to determine whether the transformer on-load tap changer is actuated. If the transformer on-load tap changer is actuated, the system starts to collect the high-frequency current signal of the entire switching period. If the transformer on-load tap changer is not actuated, the system is in a state of waiting to be triggered. After collecting the high-frequency current signal, the system connects the data to the storage control unit to complete the data storage and display.

[0027] Therefore, the high-frequency current signal monitoring device for the transformer on-load tap changer provided in the present application monitors the high-frequency current signals generated by the action of the moving and static contacts during the switching process of the transformer on-load tap changer through a high-frequency current sensor, thereby making up for the deficiency that the existing monitoring technology cannot perceive the high-frequency current signals during the switching process of the transformer on-load tap changer, and improving the equipment status perception.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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 high-frequency current signal monitoring device, characterized in that: include: A power frequency current sensor, a high frequency current sensor, and a high speed acquisition unit, wherein the power frequency current sensor is installed in the transformer on-load tap changer operating mechanism box and connected to the high speed acquisition unit via a coaxial cable, and is used to collect the power frequency current signal of the transformer on-load tap changer and determine whether the transformer on-load tap changer has a switching action; the high frequency current sensor is installed at the clamp grounding wire of the transformer, and is used to sense the high frequency current signal of the moving and static contacts during the switching process of the on-load tap changer; The high-speed acquisition unit is used to receive the power frequency current signal, and when it is determined that the on-load tap changer has a switching action, trigger the high-frequency current sensor to start acquiring the high-frequency current signal of the entire switching period of the transformer on-load tap changer, wherein the high-frequency current signal is used for status evaluation of the transformer on-load tap changer.

2. The transformer on-load tap changer high-frequency current signal monitoring device according to claim 1, characterized in that: Also includes: The detection and amplification unit arranged between the high-frequency current sensor and the high-speed acquisition unit is used to amplify and detect the high-frequency current signal.

3. The transformer on-load tap changer high-frequency current signal monitoring device according to claim 2, characterized in that: Also includes: A power supply module is used to supply power to the detection and amplification unit.

4. The transformer on-load tap changer high-frequency current signal monitoring device according to claim 3, characterized in that: Also includes: A storage control unit is used to receive the high-frequency current signal from the high-speed acquisition unit, and store and display the high-frequency current signal.

5. The transformer on-load tap changer high-frequency current signal monitoring device according to claim 4, characterized in that: The power module, the high-speed acquisition unit and the storage control unit are placed in a preset constant temperature monitoring system chassis, and the constant temperature monitoring system chassis has the function of shielding external electromagnetic interference.

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