Device for online detection of the operating status of wind turbine transformer capacitors

Abstract

A device for online detection of the operating state of wind turbine transformer capacitors, characterized by: a passive wireless temperature measuring device comprising a passive wireless temperature sensor (2) used to detect the temperature of the capacitor (1), the passive wireless temperature sensor (2) being set via a fixing on the circumferential side of the capacitor (1), the passive wireless temperature sensor (2) receiving a stimulation signal and converting the stimulation signal into a linear resonance signal associated with the temperature change; a temperature signal acquisition device used to send a stimulation signal to a passive wireless temperature measuring device and receiving the temperature response signals output by a passive wireless temperature measuring device, the temperature information is acquired and output based on a change in the frequency of the temperature response signal; a temperature monitoring device used to receive temperature signals, output temperature information, and perform monitoring processing.

Description

TECHNICAL AREA

[0001] The invention relates in particular to a device for online testing of the operating state of wind turbine transformer capacitors. BACKGROUND

[0002] In wind turbines, capacitors are key components for current conversion and safe operation. They are typically located in critical parts such as current transformers, paddle systems, and auxiliary power supplies, performing various functions including filtering, energy storage, and protection. Wind turbines, in particular, contain many large capacitors that vary considerably in function, size, and specifications. For example, a DC link capacitor, installed inside the inverter cabinet, acts as a filter and stabilizes the DC voltage; its typical dimensions are 340 mm × 165 mm × 250–715 mm. A power factor correction capacitor, 67.6 mm (diameter) × 265 mm (height), is also installed in the inverter cabinet.Regularly checking the capacitor for unusual signs such as drum packs, oil leakage or oil infiltration, and monitoring the operating temperature, not only can you fail to detect the problem in time, but in severe cases you can also affect the normal operation of the entire wind turbine, therefore the capacitors in the current transformer must be checked in a timely and effective manner. SUMMARY OF THE INVENTION

[0003] The purpose of the present invention is to solve a device for online detection of the operating state of wind turbine transformer capacitors, where capacitors cannot be tested in a timely and effective manner using existing technology.

[0004] The invention employs the following technical scheme: a device for online detection of the operating state of the wind turbine transformer-capacitor assembly, including a passive wireless temperature sensor, comprising a passive wireless temperature sensor for detecting the temperature of the capacitor, which is set via a fixing on the capacitor side, and the passive wireless temperature sensor by receiving a stimulation signal and converting the stimulation signal into a resonant signal linearly related to a temperature change; a temperature signal detection device, which is used to send a stimulation signal to a passive wireless temperature sensor and receives the temperature response signals output by a passive wireless temperature sensor, the temperature information is detected and output based on a change in the frequency of the temperature response signal;Temperature monitoring device used to receive temperature signals, output temperature information, and perform monitoring processing.

[0005] As a further description of the aforementioned technical solution: The fixing means comprise the mounting frame, the support arch plate, the rotation of the support arch plate is set on the mounting frame, the support arch plates are set in pairs, the two support arch plates of each pair rotate simultaneously around the end of the support arch plate, the support arch plate is open and has a mounting opening, the passive wireless temperature sensor is installed in the mounting opening, the aforementioned support frame includes a connecting rod, the connecting rod is set with a support plate at both ends, the rotation between the two support plates is set on a rotation axis, the two rotation axes are set via the symmetry of the connecting rod, the end of the support arch plate is fixed on the rotation axis, when the same pair of two support arch plates holds a capacitor, each pair of support arch plates forms a circle.

[0006] As a further description of the above-mentioned technical solution: The support arch plate has at least two pairs of supports installed, the distance between the two adjacent pairs of support arch plates can be adjusted, an adjusting rod is arranged along the axis of the aforementioned axis of rotation between the two aforementioned support arch plates, a control seat is installed on the support arch plate, and the adjusting block is installed in the control seat.

[0007] As a further description of the aforementioned technical solution: The fastening device also includes the mounting plate, which is positioned at one end of the mounting frame. Three sliding cutouts are formed in the mounting plate. Three sliding guide rods are arranged on the end face of the support plate, which is furthest from the connecting rod. The three sliding guide rods and the three sliding cutouts are aligned in a one-to-one correspondence with each other, and the sliding guide rods are inserted through the sliding cutouts. The mounting plate is positioned far from the end face of the support plate with a clamping plate, and the clamping plate is connected to the sliding guide rod.

[0008] As a further description of the aforementioned technical solution: A control device is installed between the mounting frame and the mounting plate. The control device comprises a control wheel that is coaxially adjusted on the axis of rotation, a control wheel positioned between the two control wheels, a double-sided toothed structure, the control wheel connected to the two control wheels, the upper end of the control wheel is fixed with a control arm, the control arm is positioned in the sliding opening, the mounting plate is positioned with a support tube towards one end of the capacitor, the lower end of the control wheel is positioned with a sliding positioning rod, the sliding positioning rod is supported on the support tube, and the sliding positioning rod is equipped with a spring located between the control rod and the support tube.

[0009] As a further description of the above-mentioned technical solution: It also includes a final display that receives and displays processed temperature data from a temperature monitoring device.

[0010] In summary, the advantageous effect of the invention due to the application of the above-mentioned technique is: (1) This application enables long-term, reliable and maintenance-free monitoring of the capacitor temperature and can perform temperature testing under high temperature conditions; capable of achieving stable and reliable data transmission over short distances, with low power consumption, low data rates, low cost and low complexity, it has high resistance to interference, can meet the temperature measurement requirements of the capacitor in the internal environment of the wind turbine, reduce maintenance costs and improve labor productivity. (2) The passive wireless temperature sensor can detect the full-size circumferential side of the capacitor in real time to ensure that the capacitor failure point can be detected in a timely manner, and the adjustable-space support arc plate can adjust the position according to the size of the capacitor to ensure a uniform arrangement of the capacitor detection points. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 shows the principles of the invention; Fig. Figure 2 shows the stereostructure of a solid according to the invention; Fig. Figure 3 shows the stereological structure of the control device according to the invention, wherein the control arm and the mounting plate are in the exploded state and the support arch plate is omitted; Fig. Figure 4 shows the stereological structure of the control device according to the invention, wherein the support arch plate is omitted; Fig. 5 shows a different angular structure of the control device according to the invention, wherein the support arch plate is excluded; Fig. Figure 6 shows the inventive fixing of a passive wireless temperature sensor on the capacitor-side structure.

[0011] Description: 1, Capacitor; 2, Passive wireless temperature sensor; 3, Support bracket; 4, Adjustment rod; 5, Adjustment block; 6, Mounting opening; 7, Connecting rod; 8, Support plate; 9, Rotary axis; 10, Mounting plate; 11, Sliding cutout; 12, Push rods; 13, Clamping plate; 14, Control wheels; 15, Control wheel; 16, Control arm; 17, Support tube; 18, Sliding positioning rod; 19, Spring. DETAILED DESCRIPTION OF THE INVENTION

[0012] The following section clearly and completely describes the technical embodiments of this embodiment in conjunction with the accompanying figures of the present invention, whereby it is evident that the described embodiments represent only a part and not the entire embodiment of the present invention. Based on the embodiments of the present invention, all other embodiments that a person skilled in the art in this field obtains without any creative work fall within the scope of protection of the present invention.

[0013] See Fig. 1-6 the invention offers a technical embodiment for a device for online detection of the operating state of wind turbine transformer capacitors: A device for online detection of the operating state of a wind turbine current transformer capacitor, comprising: a passive wireless temperature measuring device, wherein the passive wireless temperature measuring device comprises a passive wireless temperature sensor 2 used to detect the temperature of the capacitor 1, wherein the passive wireless temperature sensor 2 is set via a fixing on the circumferential side of the capacitor 1.

[0014] The fixing device comprises the mounting frame, the support arch plate 3, the support arch plate 3 is rotatably mounted on the mounting frame, the support arch plate 3 is set in pairs, the two support arch plates 3 of each pair of the support arch plate 3 rotate simultaneously around one end of the support arch plate 3, the support arch plate 3 is set in at least two pairs, in this embodiment two pairs are set, the distance between the adjacent two pairs of the support arch plates 3 can be adjusted, in particular between the two support arch plates 3 along the direction of the axis of rotation 9 an adjusting rod 4 is set, an adjusting block 5 is set in the support arch plate 3, the adjusting rod 4 is set inside the adjusting block 5.

[0015] The support arch plate 3 is open with a mounting opening 6, the passive wireless temperature sensor 2 is installed in the mounting opening 6, the support beam includes a connecting rod 7, the connecting rod 7 is set at both ends with a support plate 8, the pivot axis 9 is set between the two support plates 8, the two pivot axes 9 are arranged symmetrically with respect to the connecting rod 7, the end of the support arch plate 3 is fixed on the pivot axis 9, when the same pair of two support arch plates 3 holds the capacitor 1, each pair of support arch plates 3 forms a ring.

[0016] The described fixing tool further comprises a mounting plate 10, which is arranged at one end of the mounting frame. Three sliding openings 11 are provided on the mounting plate 10. The surface opposite the support plate 8 to the connecting rod 7 is equipped with three sliding guide rods 12, the three sliding guide rods 12 and the three sliding openings 11 corresponding to each other. The sliding guide rods 12 are arranged continuously within the sliding openings 11. A clamping plate 13 is attached to the surface opposite the mounting plate 10 to the support plate 8. The described clamping plate 13 is connected to the sliding guide rod 12.

[0017] A control device is arranged between the mounting frame and the mounting plate 10, comprising a control wheel 14 set coaxially on the axis of rotation 9, a control wheel 15 set between the two control wheels 14, which is designed as a double-sided tooth structure, the control wheel 15 engages with the two control wheels 14, the control wheel 15 is fixed at its upper end with a control arm 16, the control arm 16 slides in the sliding cutout 11, the mounting plate 10 is provided with a support tube 17 at one end of the capacitor 1, the lower end of the control wheel 15 is provided with a sliding positioning rod 18, the sliding positioning rod 18 slides on the support tube 17, a spring 19 is mounted on the described sliding positioning rod 18, .

[0018] During the installation of the test device, the passive wireless temperature sensor 2 is first installed in the mounting opening 6 of the support arch plate 3. Then, the fixing mechanism is held on the capacitor 1 by moving the control arm 16 the adjusting rod 15 towards the support tube 17. The adjusting rod 15 rotates the control wheel 14 so that the axis of rotation 9 rotates the support arch plate 3, opening the same pair of support arch plates 3. Then, the two support arch plates 3 are placed on the capacitor 1 and the control arm 16 is released. Under the gravitational force of the spring 19 and the support arch plate 3, the two support arch plates 3 hold the capacitor 1 in place so that the passive wireless temperature sensor 2 touches the side of the capacitor 1.

[0019] The passive wireless temperature sensor 2 receives a stimulation signal and converts the stimulation signal into a resonant signal linearly related to a temperature change; a temperature signal acquisition device, which is used to send a stimulation signal to a passive wireless temperature measuring device and receives the temperature response signals output by a passive wireless temperature measuring device, acquires and outputs temperature information based on a change in the frequency of the temperature response signal; a temperature monitoring device, which is used to receive temperature signals, outputs temperature information, and performs monitoring processing. Also included is an end-display device, in this embodiment a tablet (not shown in the figure), for receiving and displaying processed temperature data output by a temperature monitoring device.So that employees can identify and resolve problems in a timely manner.

[0020] The above-mentioned are only the better specific embodiments of the invention, but the scope of protection of the invention is not limited to them, and technicians familiar with the invention should be replaced or changed within the scope of the technology disclosed in the invention in accordance with the technical program of the invention and its invention concepts, all falling within the scope of protection of the invention.

Claims

[1] A device for online detection of the operating state of wind turbine transformer capacitors, characterized by : a passive wireless temperature measuring device comprising a passive wireless temperature sensor (2) used to detect the temperature of the capacitor (1), the passive wireless temperature sensor (2) being set via a fixing on the circumferential side of the capacitor (1), the passive wireless temperature sensor (2) receiving a stimulation signal and converting the stimulation signal into a linear resonance signal associated with the temperature change; a temperature signal acquisition device used to send a stimulation signal to a passive wireless temperature measuring device and receiving the temperature response signals output by a passive wireless temperature measuring device, the temperature information is acquired and output based on a change in the frequency of the temperature response signal; a temperature monitoring device used to receive temperature signals, output temperature information, and perform monitoring processing. [2] The device for online detection of the operating state of wind turbine transformer capacitors according to claim 1, characterized by, that the mounting organization consists of a mounting frame, support plates (3), the support plates (3) rotate on the mounting frame, the support plates (3) are set in pairs, the two support plates (3) of each pair of support plates (3) rotate simultaneously around one end of the support plates (3), the support plates (3) are open with mounting sockets (6), the passive wireless temperature sensor (2) is installed in the mounting socket (6), the support frame includes a connecting rod (7), the connecting rods (7) are set at both ends with a support plate (8), the axis of rotation (9) is between the two support plates (8), the symmetry of the two axes of rotation (9) with respect to the connecting rods (7) is fixed, the end of the support plates (3) is fixed on the axis of rotation (9), when the same pair of two support plates (3) hold the capacitor (1),Each pair of the supporting arch plates (3) forms a circle. [3] The device for online detection of the operating state of wind turbine transformer capacitors according to claim 2, characterized by , that the support arch plate (3) is set to at least two pairs, the distance between the adjacent two pairs of support arch plates (3) is adjustable, an adjusting rod (4) is set between the two support arch plates (3) along the axial direction of the axis of rotation (9), the adjusting block (5) is set on the support arch plate (3) and the adjusting rod (4) is set in the adjusting block (5). [4] The device for online detection of the operating state of wind turbine transformer capacitors according to claim 2, characterized by, that the fixing device further comprises a mounting plate (10), wherein the mounting plate (10) is arranged at one end of the mounting arm, three sliding cutouts (11) are provided on the mounting plate (10), three push guide rods (12) are attached to the end face of the support plate (8) arranged on the opposite side of the connecting rod (7), wherein the three push guide rods (12) and the three sliding cutouts (11) correspond to each other, the push guide rods (12) are inserted into the sliding cutout (11), and a clamping plate (13) is arranged on the end face of the mounting plate (10) arranged on the opposite side of the support plate (8), wherein the clamping plate (13) is connected to the push guide rods (12). [5] The device for online detection of the operating state of wind turbine transformer capacitors according to claim 4, characterized bya control device between the mounting frame and the mounting plate (10), comprising an adjusting wheel (14) set coaxially on the pivot axis (9), a control wheel (15) set between the two adjusting wheels (14), the control wheel (15) is a double-sided toothed structure, the control wheel (15) is connected to both adjusting wheels (14), the control wheel (15) is fixed at its upper end with a control arm (16), the control arm (16) is set in the sliding cutout (11), the mounting plate (10) is provided at one end of the capacitor (1) with a support tube (17), the lower end of the control wheel (15) is provided with a sliding positioning rod (18) and the sliding positioning rod (18) is displaced on the support tube (17), the upper set of the sliding positioning rod (18) is provided with a spring (19) located between the adjusting rod (15) and the support tube (17). [6] The device for online detection of the operating state of wind turbine transformer capacitors according to claim 1, characterized by that it also includes an end-display device that receives and displays processed temperature data from the temperature monitoring device.

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