Transformer active protection device

Abstract

The utility model provides an active protection device for a transformer, which comprises an ultrasonic sensor, a high-frequency current transformer and an ultrahigh-frequency sensor which can respectively monitor an ultrasonic signal, a high-frequency signal and an ultrahigh-frequency signal generated by partial discharge of the transformer. The ultrasonic sensor comprises a sensor body, fixing connecting pieces, a magnetic element and a detachable pull ring, the two fixing connecting pieces are oppositely arranged on the two sides of the sensor body, the magnetic element is arranged on the side, used for being attached to the transformer box wall, of each fixing connecting piece and can be attracted to the iron box wall, and the detachable pull ring is arranged on the other side of each fixing connecting piece. During installation, the ultrasonic sensor is fixed in a magnetic element adsorption mode, punching on a transformer box body is not needed, and installation is simpler and more convenient. When the ultrasonic sensor needs to be taken down or the installation position needs to be replaced, the ultrasonic sensor can be taken down smoothly only by applying a pulling force enough to overcome the magnetic attraction force to the dismounting pull ring, and the installation position is convenient to adjust.

Description

Technical Field

[0001] The utility model belongs to the technical field of transformer monitoring, and particularly relates to a transformer active protection device. Background Art

[0002] The monitoring of partial discharge in transformers is an important means to ensure the safe and stable operation of transformers, and is an essential content for improving the reliability and safety of power systems. By monitoring the partial discharge situation of transformers, potential problems in equipment operation can be discovered, thereby predicting the occurrence of serious accidents such as insulation breakdown. In addition, the health status of transformers can be understood, providing a basis for their maintenance and management. The transformer active defense protection device is a set of devices that realize transformer protection through the perception of partial discharge signals for oil-filled equipment such as large power transformers. The main signals perceived are high-frequency partial discharge signals, ultrasonic partial discharge signals, and ultra-high-frequency partial discharge signals.

[0003] In the prior art, ultrasonic sensors are often used to detect ultrasonic signals. When in use, the ultrasonic sensor is mounted on the transformer tank wall, and a coupling agent is applied to the bonding surface between the ultrasonic sensor and the transformer tank wall, and finally fixed by bolt connection. This installation method requires pre-drilling bolt mounting holes on the transformer tank wall, and the installation method is relatively cumbersome and it is not easy to adjust the installation position. Summary of the Utility Model

[0004] The utility model provides a transformer active protection device, aiming to solve the problem that the installation of ultrasonic sensors in the prior art is inconvenient.

[0005] To achieve the above object, the technical solution adopted by the utility model is: to provide a transformer active protection device, including an ultrasonic sensor, a high-frequency current transformer, an ultra-high-frequency sensor, and a data monitoring unit. The ultrasonic sensor, the high-frequency current transformer, and the ultra-high-frequency sensor are respectively arranged on the transformer, and the ultrasonic sensor, the high-frequency current transformer, and the ultra-high-frequency sensor are respectively in communication connection with the data monitoring unit;

[0006] The ultrasonic sensor includes:

[0007] A sensor body, defining one side surface of the sensor body as a detection surface;

[0008] Two fixing connectors, relatively arranged on both sides of the sensor body. The fixing connector has a connecting portion connected to the sensor body and a fixing portion arranged along the extending direction of the detection surface;

[0009] A plurality of magnetic elements, respectively arranged on one side of the fixing portion adjacent to the detection surface; and

[0010] A plurality of disassembly pull rings are respectively arranged on one side of the fixing part away from the detection surface.

[0011] In a possible implementation manner, the fixed connecting piece is an L-shaped plate. One end of the L-shaped plate is connected to the sensor body by screws to form the connecting part, and the other end of the L-shaped plate is provided with the magnetic element and the disassembly pull ring to form the fixing part.

[0012] In a possible implementation manner, the ultrasonic sensor further includes a housing. The housing has a receiving cavity with an opening on one side. The sensor body is arranged in the receiving cavity, and the detection surface corresponds to the opening side of the receiving cavity. The housing is provided with a connecting plate at the outer edge of the opening side of the receiving cavity;

[0013] The fixed connecting piece is a hinge. The hinge includes a rotating shaft and two blade pieces respectively rotatably connected to the rotating shaft. One of the blade pieces is connected to the connecting plate to form the connecting part, and the other blade piece is provided with the magnetic element and the disassembly pull ring to form the fixing part.

[0014] In a possible implementation manner, the fixed connecting piece includes a plurality of hinges. The blade piece of one of the hinges is connected to the connecting plate, and adjacent two hinges are connected to each other. The magnetic element and the pull ring are arranged on the blade piece of the hinge at the outermost end.

[0015] In a possible implementation manner, the disassembly pull ring is fixed to the fixing part by bolts.

[0016] In a possible implementation manner, an annular accommodation groove is formed on the detection surface, and a coupling agent sealing ring is arranged in the accommodation groove and protrudes from the detection surface.

[0017] In a possible implementation manner, the sensor body is a piezoelectric sensor.

[0018] In a possible implementation manner, the sensor body includes:

[0019] A bottom plate, the lower surface of the bottom plate forms the detection surface;

[0020] A piezoelectric component, including a lower piezoelectric sheet, a lower conductive sheet, an upper piezoelectric sheet, an upper conductive sheet and a piezoelectric element stacked on the bottom plate from bottom to top;

[0021] A housing, covering the bottom plate, the piezoelectric component is accommodated in the housing, and the connecting part is connected to the housing; and

[0022] A pressure spring is provided between the piezoelectric element and the inner wall of the housing, and the pressure spring applies a pre-pressure to the piezoelectric element.

[0023] In a possible implementation, the sensor body includes a plurality of the piezoelectric assemblies and a plurality of the pressure springs, and the pressure springs and the piezoelectric assemblies correspond one by one.

[0024] In a possible implementation, a plurality of sensor interfaces are provided on the housing, and the sensor interfaces correspond to the piezoelectric assemblies.

[0025] The beneficial effects of the transformer active protection device provided by the present utility model are as follows:

[0026] The transformer active protection device provided by the present utility model includes an ultrasonic sensor, a high-frequency current transformer, and a UHF sensor, which can respectively monitor ultrasonic signals, high-frequency signals, and UHF signals generated by partial discharge of the transformer, and can detect in time when the transformer operates abnormally. The ultrasonic sensor includes a sensor body, a fixed connecting piece, a magnetic element, and a disassembly pull ring. The two fixed connecting pieces are oppositely arranged on both sides of the sensor body. A magnetic element is provided on one side of the fixed connecting piece for fitting the transformer tank wall, and the magnetic element can adsorb on the iron tank wall. A disassembly pull ring is provided on the other side of the fixed connecting piece. During installation, the ultrasonic sensor is fixed by the adsorption of the magnetic element, without drilling holes in the transformer box body, and the installation is simpler and more convenient. When it is necessary to remove or change the installation position, only a sufficient pulling force to overcome the magnetic attraction needs to be applied to the disassembly pull ring, and the ultrasonic sensor can be smoothly removed, facilitating the adjustment of the installation position. Description of the Drawings

[0027] Figure 1 It is a schematic structural diagram of the transformer active defense protection device provided by one embodiment of the present utility model;

[0028] Figure 2 It is a schematic structural diagram of the ultrasonic sensor in one embodiment of the present utility model;

[0029] Figure 3 It is a schematic structural diagram of the ultrasonic sensor in another embodiment of the present utility model;

[0030] Figure 4 It is an internal cross-sectional view of the ultrasonic sensor in still another embodiment of the present utility model.

[0031] Description of the Reference Numerals:

[0032] 1. Transformer active protection device; 10. Ultrasonic sensor; 11. Sensor body; 111. Bottom plate; 112. Piezoelectric component; 1121. Lower piezoelectric sheet; 1122. Lower conductive sheet; 1123. Upper piezoelectric sheet; 1124. Upper conductive sheet; 1125. Piezoelectric element; 113. Outer shell; 114. Pressure spring; 115. Couplant sealing ring; 116. Sensor interface; 12. Fixed connecting piece; 121. Connecting part; 122. Fixed part; 13. Magnetic element; 14. Disassembly pull ring; 15. Cover shell; 151. Connecting plate; 16. Hinge; 20. High-frequency current transformer; 30. UHF sensor. Detailed implementation manners

[0033] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0034] It should be noted that when an element is referred to as "fixed to", "fixed", "fixedly provided on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected to", "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. When an element is referred to as "provided on", "provided in" another element, it can be directly on the other element or there may also be an intermediate element. "Plurality" refers to two or more quantities. "At least one" refers to one or more quantities. "Several" refers to one or more quantities.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs.

[0036] Please refer to Figures 1 to 4 together, and the transformer active protection device 1 provided by the embodiment of the present utility model will be described below.

[0037] Please refer to Figure 1 and Figure 2, an embodiment of the present utility model provides a transformer active protection device 1, which includes an ultrasonic sensor 10, a high-frequency current transformer 20, a very-high-frequency sensor 30, and a data monitoring unit. The ultrasonic sensor 10, the high-frequency current transformer 20, and the very-high-frequency sensor 30 are respectively arranged on the transformer, and the ultrasonic sensor 10, the high-frequency current transformer 20, and the very-high-frequency sensor 30 are respectively communicatively connected to the data monitoring unit; the ultrasonic sensor 10 includes a sensor body 11, two fixing connectors 12, a magnetic element 13, and a disassembly pull ring 14. One side surface of the sensor body 11 is defined as the detection surface; the two fixing connectors 12 are oppositely arranged on both sides of the sensor body 11, and the fixing connector 12 has a connecting portion 121 connected to the sensor body 11 and a fixing portion 122 arranged along the extending direction of the detection surface; a plurality of magnetic elements 13 are respectively arranged on one side of the fixing portion 122 adjacent to the detection surface; a plurality of disassembly pull rings 14 are respectively arranged on one side of the fixing portion 122 away from the detection surface.

[0038] Compared with the prior art, the beneficial effects of the transformer active protection device 1 provided by the embodiment of the present utility model are as follows:

[0039] The transformer active protection device 1 includes an ultrasonic sensor 10, a high-frequency current transformer 20, and a very-high-frequency sensor 30, which can respectively monitor ultrasonic signals, high-frequency signals, and very-high-frequency signals generated by partial discharge of the transformer, and can promptly detect when the transformer operates abnormally. The ultrasonic sensor 10 includes a sensor body 11, fixing connectors 12, a magnetic element 13, and a disassembly pull ring 14. The two fixing connectors 12 are oppositely arranged on both sides of the sensor body 11. A magnetic element 13 is arranged on one side of the fixing connector 12 for fitting the transformer tank wall, and the magnetic element 13 can adsorb on the iron tank wall. A disassembly pull ring 14 is arranged on the other side of the fixing connector 12. During installation, the ultrasonic sensor 10 is fixed by the adsorption of the magnetic element 13, without punching holes in the transformer box body, and the installation is simpler and more convenient. When it is necessary to remove or change the installation position, only a sufficient pulling force to overcome the magnetic attraction needs to be applied to the disassembly pull ring 14, and the ultrasonic sensor 10 can be smoothly removed, facilitating the adjustment of the installation position.

[0040] In the embodiment of the present utility model, the sensor body 11, the high-frequency current transformer 20, and the very-high-frequency sensor 30 can directly select products with appropriate specifications and models in the prior art, and one or more can be arranged on the transformer according to needs.

[0041] In a specific embodiment, the sensor part includes a total of 8 ultrasonic sensors, 3 high-frequency current transformers, and 1 ultra-high-frequency sensor, which are installed and fixed according to the equipment requirements. The processor is electrically connected to the above sensors respectively for data analysis and processing. The processor can adopt a dual-system setting. Each set of hardware system includes an independent signal conditioning channel, AD sampling, CPU, as well as auxiliary circuits such as a power supply module and a self-calibration module. Two independent systems can be set according to needs. The two independent systems work independently of each other without interference. When one system fails, the other system can operate normally. The data monitoring unit is used for the background monitoring of the active protection device, saving the real-time data of the active protection device and the fault alarm information.

[0042] The ultrasonic sensor 10 is used to monitor ultrasonic signals, including a sensor body 11, a fixing connector 12, a magnetic element 13, and a disassembly pull ring 14. One side of the sensor body 11 is a detection surface. During installation, the detection surface is attached to the inner wall of the transformer tank, and a coupling agent is applied to the attachment surface.

[0043] The fixing connector 12 can be a metal or non-metal component. The fixing connector 12 can be connected to the sensor body 11 / magnetic element 13 and the disassembly pull ring 14 by means such as gluing and screw fixing. The magnetic element 13 is a strong magnet that can firmly adsorb on the inner wall of the transformer tank and will not fall off.

[0044] In some possible embodiments, the fixing part 122 is provided with a receiving groove on the side adjacent to the detection surface. The receiving groove penetrates along one side, and the magnetic element 13 is limited in the receiving groove. During assembly, the magnetic element 13 is pushed into the receiving groove along the penetrating direction of the receiving groove. The receiving groove has a stop portion on the side adjacent to the detection surface for stopping and limiting the magnetic element 13.

[0045] The transformer core grounding bar passes through the high-frequency current transformer 20 to detect the core grounding current signal. The data monitoring unit is communicatively connected to the ultrasonic sensor 10, the high-frequency current transformer 20, and the ultra-high-frequency sensor 30. Specifically, information transmission can be realized by means such as wired transmission, wireless network, and Bluetooth. The data monitoring unit can collect and store data, and form a transformer alarm and trip strategy by collecting, analyzing, and diagnosing partial discharge (i.e., PD) signals. The alarm and trip strategy can output an alarm signal or drive a trip coil to trip the transformer, thereby realizing the forward movement of the transformer protection node, avoiding explosion and fire accidents, and reducing losses.

[0046] Please refer to Figure 2, in some possible embodiments, the fixing connector 12 is an L-shaped plate. One end of the L-shaped plate is connected to the sensor body 11 by screws to form a connecting portion 121, and the other end of the L-shaped plate is provided with a magnetic element 13 and a disassembly pull ring 14 to form a fixing portion 122.

[0047] In this embodiment, the fixing connector 12 is an L-shaped plate, which can be processed by stamping, bending, metal cutting and other methods. One end of the L-shaped plate is connected to the sensor body 11 by screws, and threaded holes should be drilled in advance on the outer shell 113 of the sensor body 11. The other end of the L-shaped plate is installed with a magnetic element 13 and a disassembly pull ring 14, which can be fixed by screws or other means.

[0048] Please refer to Figure 3 , in some possible embodiments, the ultrasonic sensor 10 further includes a cover 15. The cover 15 has a receiving cavity with an opening on one side. The sensor body 11 is disposed in the receiving cavity, and the detection surface corresponds to the opening side of the receiving cavity. The cover 15 is provided with a connecting plate 151 on the outer edge of the opening side of the receiving cavity; the fixing connector 12 is a hinge 16, and the hinge 16 includes a rotating shaft and two leaf pieces respectively rotatably connected to the rotating shaft. One of the leaf pieces is connected to the connecting plate 151 to form a connecting portion 121, and the other leaf piece is provided with a magnetic element 13 and a disassembly pull ring 14 to form a fixing portion 122.

[0049] In this embodiment, a cover 15 is disposed outside the sensor body 11, and the sensor body 11 can be fixed in the cover 15 by gluing or other means. The fixing connector 12 is a hinge 16, and the two leaf pieces of the hinge 16 can rotate relative to each other, so that the setting surfaces of the two fixing connectors 12 can be not in the same plane (such as can be set on a right-angle surface), with stronger adaptability.

[0050] Please refer to Figure 3 , in some possible embodiments, the fixing connector 12 includes a plurality of hinges 16. One leaf piece of one hinge 16 is connected to the connecting plate 151, and adjacent two hinges 16 are connected to each other. The magnetic element 13 and the pull ring are disposed on the leaf piece of the hinge 16 at the outermost end. The plurality of hinges 16 can extend the fixing distance, and the leaf pieces of adjacent two hinges 16 can be connected and fixed by connecting pieces such as screws and rivets.

[0051] In some possible embodiments, the disassembly pull ring 14 is fixed to the fixing portion 122 by bolts, with firm connection and strong tensile capacity. There are no restrictions on the shape and quantity of the disassembly pull ring 14. The disassembly pull ring can be in shapes such as circular, square, triangular, trapezoidal, etc., and one or more can be set according to needs.

[0052] In some possible embodiments, an annular accommodation groove is formed on the detection surface, and a couplant sealing ring 115 is arranged in the accommodation groove. The couplant sealing ring 115 protrudes from the detection surface. During installation, the couplant is applied within the couplant sealing ring 115. The design of the couplant sealing ring 115 can ensure that the couplant will not be soiled or weathered. The couplant sealing ring 115 can be in the shape of a square or a circular ring, etc. The detection end of the sensor body 11 corresponds to the restricted range of the couplant sealing ring 115.

[0053] In some possible embodiments, the sensor body 11 is a piezoelectric sensor.

[0054] Please refer to Figure 4 , in some possible embodiments, the sensor body 11 includes a bottom plate 111, a piezoelectric assembly 112, a housing 113, and a pressure spring 114. The lower surface of the bottom plate 111 forms the detection surface; the piezoelectric assembly 112 includes a lower piezoelectric sheet 1121, a lower conductive sheet 1122, an upper piezoelectric sheet 1123, an upper conductive sheet 1124, and a piezoelectric element 1125 stacked on the bottom plate 111 from bottom to top; the housing 113 covers the bottom plate 111, the piezoelectric assembly 112 is accommodated within the housing 113, and the connecting portion 121 is connected to the housing 113; the pressure spring 114 is arranged between the piezoelectric element 1125 and the inner wall of the housing 113, and the pressure spring 114 applies a pre-pressure to the piezoelectric element 1125.

[0055] In this embodiment, the piezoelectric element 1125 is in a block shape and can detect ultrasonic signals. In addition, the system composed of the lower piezoelectric sheet 1121, the lower conductive sheet 1122, the upper piezoelectric sheet 1123, the upper conductive sheet 1124, the piezoelectric element 1125, and the pressure spring 114 can also detect low-frequency signals. The piezoelectric element 1125 acts as a mass block within this system. With such an arrangement, the sensor body 11 can simultaneously detect low-frequency and high-frequency signals generated at the same position, with smaller errors and a wider detection range.

[0056] The arrangement and working principle of the lower piezoelectric sheet 1121, the lower conductive sheet 1122, the upper piezoelectric sheet 1123, the upper conductive sheet 1124, the piezoelectric element 1125, and the pressure spring 114 are prior art in the field of low-frequency signal detection and will not be elaborated here. In this embodiment, the lower piezoelectric sheet 1121, the lower conductive sheet 1122, the upper piezoelectric sheet 1123, and the upper conductive sheet 1124 are sequentially arranged on the upper surface of the bottom plate 111 from bottom to top. The piezoelectric element 1125 and the pressure spring 114 are arranged on the upper conductive sheet 1124. The lower surface of the lower piezoelectric sheet 1121 is grounded, and the lower conductive sheet 1122 is electrically connected to the signal processor; the upper piezoelectric sheet 1123 and the lower piezoelectric sheet 1121 can be grounded separately or grounded in parallel.

[0057] In some possible embodiments, the sensor body 11 includes a plurality of piezoelectric components 112 and a plurality of pressure springs 114. The pressure springs 114 and the piezoelectric components 112 are in one-to-one correspondence. The plurality of piezoelectric components 112 form a self-contained system, operate independently of each other, and do not affect each other.

[0058] Please refer to Figure 2 , in some possible embodiments, a plurality of sensor interfaces 116 are provided on the housing 113. The sensor interfaces 116 correspond to the piezoelectric components 112. The plurality of piezoelectric components 112 realize data transmission and communication connection with external devices through their respective sensor interfaces 116.

[0059] It can be understood that the various parts in the above embodiments can be freely combined or deleted to form different combined embodiments. The specific contents of each combined embodiment will not be elaborated here. After this explanation, it can be considered that the specification of the present utility model has recorded each combined embodiment and can support different combined embodiments.

[0060] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A transformer active protection device (1), characterized in that: The invention comprises an ultrasonic sensor (10), a high-frequency current transformer (20), an ultra-high frequency sensor (30), and a data monitoring unit, wherein the ultrasonic sensor (10), the high-frequency current transformer (20), and the ultra-high frequency sensor (30) are respectively arranged on a transformer, and the ultrasonic sensor (10), the high-frequency current transformer (20), and the ultra-high frequency sensor (30) are respectively communicatively connected to the data monitoring unit; The ultrasonic sensor (10) comprises: A sensor body (11), wherein one side surface of the sensor body (11) is defined as a detection surface; Two fixed connecting members (12) are arranged on two sides of the sensor body (11) opposite to each other, and the fixed connecting member (12) comprises a connecting portion (121) connected to the sensor body (11) and a fixing portion (122) arranged along the extension direction of the detection surface; A plurality of magnetic elements (13) are respectively arranged on one side of the fixing portion (122) adjacent to the detection surface; and A plurality of disassembly pull rings (14) are respectively arranged on a side of the fixing portion (122) away from the detection surface.

2. The transformer active protection device (1) according to claim 1, characterized in that: The fixed connection member (12) is an L-shaped plate, one end of which is connected to the sensor body (11) by means of screws to form the connecting portion (121), and the other end of the L-shaped plate is provided with the magnetic element (13) and the disassembly pull ring (14) to form the fixed portion (122).

3. The transformer active protection device (1) according to claim 1, characterized in that: The ultrasonic sensor (10) further comprises a housing (15), wherein the housing (15) has a housing cavity, one side of the housing cavity is open, the sensor body (11) is arranged in the housing cavity, and the detection surface corresponds to the open side of the housing cavity, and the housing (15) is provided with a connecting plate (151) at the outer edge of the open side of the housing cavity; The fixed connection member (12) is a hinge (16), and the hinge (16) includes a rotating shaft and two leaves respectively connected to the rotating shaft, one of which is connected to the connecting plate (151) to form the connecting portion (121), and the other of which is provided with the magnetic element (13) and the disassembly pull ring (14) to form the fixed portion (122).

4. The transformer active protection device (1) according to claim 3, characterized in that: The fixed connection member (12) comprises a plurality of hinges (16), wherein the leaf piece of one of the hinges (16) is connected to the connecting plate (151), two adjacent hinges (16) are connected to each other, and the magnetic element (13) and the pull ring are arranged on the leaf piece of the hinge (16) at the end.

5. The transformer active protection device (1) according to claim 1, characterized in that: The disassembly pull ring (14) is fixed to the fixing portion (122) by means of bolts.

6. The transformer active protection device (1) according to claim 1, characterized in that: The detection surface is provided with an annular accommodating groove, a coupling agent sealing ring (115) is provided in the accommodating groove, and the coupling agent sealing ring (115) protrudes from the detection surface.

7. The transformer active protection device (1) according to claim 1, characterized in that: The sensor body (11) is a piezoelectric sensor.

8. The transformer active protection device (1) according to claim 7, characterized in that: The sensor body (11) comprises: A bottom plate (111), the lower surface of the bottom plate (111) forming the detection surface; A piezoelectric assembly (112), comprising a lower piezoelectric sheet (1121), a lower conductive sheet (1122), an upper piezoelectric sheet (1123), an upper conductive sheet (1124), and a piezoelectric element (1125) stacked on the bottom plate (111) from bottom to top; A housing (113) is disposed on the bottom plate (111), the piezoelectric component (112) is accommodated in the housing (113), and the connecting portion (121) is connected to the housing (113); and The pressure spring (114) is arranged between the piezoelectric element (1125) and the inner wall of the housing (113), and the pressure spring (114) applies a pre-pressure to the piezoelectric element (1125).

9. The transformer active protection device (1) according to claim 8, characterized in that: The sensor body (11) comprises a plurality of the piezoelectric components (112) and a plurality of the pressure springs (114), and the pressure springs (114) correspond one to one to the piezoelectric components (112).

10. The transformer active protection device (1) according to claim 9, characterized in that: The housing (113) is provided with a plurality of sensor interfaces (116), and the sensor interfaces (116) correspond to the piezoelectric components (112).

Images