A transformer oil pillow oil level monitoring device

Abstract

The present application relates to the technical field of transformer, and particularly discloses a transformer oil pillow oil level monitoring device, which comprises a measuring pipe, an oil level measuring module, a GPS positioning module, a control module and a wireless communication module; the measuring pipe is installed outside the transformer oil pillow and communicates with the oil liquid inside the oil pillow; the oil level measuring module comprises a resistance strip and a guide rod, a floating plate is slidably sleeved on the guide rod, a contact head is arranged on the floating plate, and the contact position of the contact head with the resistance strip changes with the lifting of the floating plate; the control module obtains first oil level data by comparing the current signal of the contact position of the contact head with a preset value; the GPS positioning module is used for acquiring geographical position information of the transformer oil pillow; and the wireless communication module is used for transmitting the first oil level data and the geographical position information to a power remote monitoring platform. The monitoring device can replace manual patrol of the transformer oil pillow oil level, and greatly reduces the workload and labor intensity of power operation and maintenance personnel.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, and more specifically to a transformer oil conservator oil level monitoring device. Background Technology

[0002] The transformer oil conservator is an auxiliary oil storage container for oil-immersed transformers. It is used to contain transformer oil that expands and contracts due to temperature changes, preventing oil from overflowing the transformer body. Currently, oil level monitoring relies heavily on manual inspections. Maintenance personnel need to periodically climb up to the transformer and visually check the oil level by observing the oil level gauge on the conservator. Because the oil level gauge usually uses a float-type structure, the float is held against the bottom of the bladder inside the conservator by a connecting rod half-shaft during operation. When the bladder malfunctions, the oil level indicated by the float level gauge may be inaccurate.

[0003] To address this, existing technologies include using a measuring tube attached to the outside of the oil conservator to indicate the oil level. This method utilizes the principle that the measuring tube is connected to the inside of the oil conservator and the oil level is consistent. However, sometimes the oil level is measured manually by observing the position of the oil level line indicated in the oil level gauge. On the one hand, visual observation has a large error. On the other hand, because the capsule expands and contracts inside the oil conservator, the oil level in the measuring tube fluctuates greatly, resulting in inaccurate measurements.

[0004] Furthermore, some oil level gauges using measuring tubes typically provide a range of values, and the fluctuations in oil level make it impossible to obtain accurate data. Moreover, oil level gauges may malfunction during use, but existing measuring tube methods cannot identify malfunctions, provide feedback on the current oil level, or offer targeted alarms to prevent rapid response from maintenance personnel. Summary of the Invention

[0005] The purpose of this invention is to address the problem that existing transformer oil level measurement methods cannot obtain accurate oil level data, and to provide a transformer oil level monitoring device. This device can reduce the impact of oil level fluctuations on the measurement data, resulting in more accurate oil level data. Furthermore, it can identify faults in the oil level gauge itself and provide timely remote alarm prompts for fault conditions, making it more convenient for maintenance personnel to monitor transformer operation.

[0006] This invention is achieved through the following technical solution:

[0007] This invention provides a transformer oil conservator oil level monitoring device, including a measuring tube, an oil level measuring module, a GPS positioning module, a control module, and a wireless communication module. The measuring tube is installed outside the transformer oil conservator and communicates with the oil inside. The oil level measuring module includes a resistance bar and a guide rod, both vertically positioned inside the measuring tube. The resistance bar is positioned to accommodate the oil level fluctuation range during normal transformer operation, with one end connected to the positive terminal of a power module. A float plate is slidably mounted on the guide rod, and a contact head is provided on the float plate. The contact position between the contact head and the resistance bar changes with the rise and fall of the float plate, and the contact head is connected to the negative terminal of the power module. The control module obtains first oil level data based on the loop current signal at the contact head's location. The GPS positioning module is used to acquire the geographical location information of the transformer oil conservator. The wireless communication module is used to transmit the first oil level data and geographical location information to a power remote monitoring platform.

[0008] As a feasible solution of the present invention, the oil level measurement module further includes a laser ranging sensor disposed on the top of the measuring tube. One end of the probe of the laser ranging sensor faces the upper surface of the float. The control module obtains the second oil level data based on the data from the laser ranging sensor, calculates the difference between the second and first oil level data, and feeds back to the power remote monitoring platform when the difference exceeds the first threshold.

[0009] As a feasible solution of the present invention, it also includes an oil temperature measurement module. The temperature probe of the oil temperature measurement module is set at the bottom of the measuring tube. The control module obtains the corresponding standard oil level of the transformer oil conservator according to the measured oil temperature value, and calculates the difference by comparing it with the measured oil level data. When the difference exceeds the second threshold, it is fed back to the power remote monitoring platform.

[0010] As a feasible solution of the present invention, it also includes an early warning module, which includes a first probe and a second probe disposed on the measuring tube. The first probe is positioned higher than the resistance strip, and the second probe is positioned lower than the resistance strip. When the contact head contacts the first probe or the second probe, the control module sends an alarm message to the power remote monitoring platform.

[0011] As a feasible solution of the present invention, the measuring tube is fixed on the transformer oil conservator, and a connector is provided on the lower side wall of the measuring tube. One end of the connector is connected to the inside of the measuring tube, and the other end is connected to the inside of the transformer oil conservator. The outer wall of the connector is sealed to the hole opened on the transformer oil conservator.

[0012] As a feasible solution of the present invention, a filter cover is provided at one end of the connector that extends into the transformer oil conservator. The filter cover is used to filter the oil that enters the measuring tube through the connector.

[0013] As a feasible solution of the present invention, a positioning platform is provided on the bottom wall inside the measuring tube, and a positioning hole is provided on the positioning platform. The lower end of the guide rod is fitted into the positioning hole and the guide rod is kept arranged in the vertical direction.

[0014] As a feasible solution of the present invention, the guide rod is a metal rod with a square cross-section, the float plate is circular or square, and a through hole adapted to the guide rod is provided at the center of the float plate, and the guide rod slides through the through hole.

[0015] As a feasible solution of the present invention, an installation cylinder is provided at one end of the contact head that extends into the float plate, and a ball bearing is rotatably installed at the end of the installation cylinder facing the guide rod. After the float plate is slidably fitted onto the guide rod, the ball bearing contacts the guide rod.

[0016] As a feasible solution of the present invention, a compression spring is provided inside the mounting cylinder. One end of the compression spring abuts against the inner wall of the mounting cylinder, and the other end abuts against the ball bearing, so as to push the ball bearing to contact the guide rod.

[0017] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0018] 1. In use, the measuring tube is installed outside the transformer oil conservator, and a hole is made in the transformer oil conservator to allow the inside of the measuring tube to communicate with the oil inside the conservator. After installation, the oil level inside the measuring tube is the same as that inside the transformer oil conservator. This device is simple to install and can be added to existing transformer oil conservators with virtually no impact on the existing internal structure. Since it does not have direct contact with the capsule inside the transformer oil conservator, it is not affected by the capsule's breathing and pressure changes, and the long-term monitoring data is reliable. It can replace manual inspection of the transformer oil conservator oil level, greatly reducing the workload and labor intensity of power operation and maintenance personnel.

[0019] 2. The oil level measurement module in this invention includes a resistance bar and a guide rod. The arrangement of the resistance bar meets the oil level fluctuation range of the transformer during normal operation. When the oil level changes, the float slides up and down along the guide rod. The contact position between the contact head on the float and the resistance bar changes with the rise and fall of the float. The control module can obtain the first oil level data by comparing the current signal of the contact head at a certain contact position with a preset value, thereby obtaining the current oil level data. In this method, the float slides up and down along the guide rod, which can eliminate the measurement error caused by the local fluctuation of the oil level when the capsule expands and contracts. At the same time, combined with the monitoring circuit current signal, more accurate oil level measurement data can be obtained.

[0020] 3. In this invention, the oil level measurement module also obtains the second oil level data through a laser ranging sensor and calculates the difference with the first oil level data. When the difference exceeds the first threshold, it is fed back to the power remote monitoring platform, thereby mutually verifying whether the two oil level measurement methods have malfunctioned, thus improving the accuracy of oil level monitoring.

[0021] 4. In this invention, the control module obtains the corresponding standard oil level of the transformer oil conservator based on the oil temperature value measured by the oil temperature measurement module, and compares the actual measured oil level data with the standard oil level. Once it is found that the measured oil level data deviates significantly from the standard oil level corresponding to the oil temperature, the difference is fed back to the power remote monitoring platform when it exceeds the second threshold, thereby better monitoring the oil level of the transformer oil conservator and reflecting the working status of the transformer.

[0022] 5. In this invention, by setting an early warning module, when the contact head contacts the first probe or the second probe, the control module sends an alarm message to the power remote monitoring platform. In this way, when the transformer oil level is at an extremely low or extremely high level, a remote alarm can be issued in a timely manner. Based on the geographical location information of the transformer oil level provided by the GPS positioning module, it is convenient for maintenance personnel to go to the site in a timely manner to troubleshoot related faults.

[0023] 6. In this invention, by setting an installation cylinder on the contact head, and rotating the installation ball on the installation cylinder, the ball contacts the guide rod, allowing the float to rise and fall smoothly under the action of the guide rod. This prevents tilting and jamming when the oil level fluctuates, which is beneficial to the accuracy of the measurement. At the same time, by using a metal guide rod, the guide rod can be connected to the negative terminal of the power module, and the contact head can contact the guide rod through the installation cylinder and ball inside the float, thereby achieving the connection to the negative terminal of the power module. This simplifies the connection wires inside the measuring tube. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings:

[0025] Figure 1 This is a schematic diagram of the installation of the transformer oil conservator level monitoring device in this invention;

[0026] Figure 2 This is a schematic diagram of the internal structure of the measuring tube in this invention;

[0027] Figure 3 This is a top view of the float and guide rod after installation in this invention;

[0028] Figure 4 This is a cross-sectional view of the floating plate in this invention;

[0029] Figure 5 This is a schematic diagram of the transformer oil level monitoring device of the present invention.

[0030] The attached diagram shows the markings and corresponding component names:

[0031] 1-Transformer oil conservator, 2-Measuring tube, 21-Connector, 22-Sealing ring, 23-Locking nut, 24-Filter cover, 25-Positioning platform, 26-Fixing ear, 3-Resistance strip, 4-Guide rod, 5-Float plate, 6-Contact head, 61-Mounting cylinder, 62-Ball bearing, 63-Compression spring, 7-Laser rangefinder sensor, 8-Temperature probe, 91-First probe, 92-Second probe. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0034] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary and secondary relationship of the indicated technical features.

[0035] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0036] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0037] In the description of the embodiments of this application, the technical terms "height," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0038] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0039] Please refer to Figures 1 to 5 This application provides a transformer oil conservator oil level monitoring device, comprising a measuring tube 2, an oil level measuring module, a GPS positioning module, a control module, and a wireless communication module. The measuring tube 2 is installed outside the transformer oil conservator 1 and communicates with the oil inside the conservator. The oil level measuring module includes a resistance bar 3 and a guide rod 4, both of which are vertically arranged inside the measuring tube 2. The arrangement of the resistance bar 3 satisfies the oil level fluctuation range of the oil conservator during normal operation of the transformer, and one end of the resistance bar 3 is connected to the positive terminal of the power supply module. A float 5 is slidably mounted on the guide rod 4, and a contact head 6 is provided on the float 5. The contact position between the contact head 6 and the resistance bar 3 changes with the rise and fall of the float 5, and the contact head 6 is connected to the negative terminal of the power supply module. The control module obtains the first oil level data based on the loop current signal at the location of the contact head 6. The GPS positioning module is used to obtain the geographical location information of the transformer oil conservator 1. The wireless communication module is used to transmit the first oil level data and geographical location information to a power remote monitoring platform.

[0040] The measuring tube 2 in this application has the same height as the transformer oil conservator 1 and can be directly installed on the outside of the existing transformer oil conservator 1. When installing, the measuring tube 2 is arranged vertically to ensure that the resistance bar 3 and the guide rod 4 are also arranged vertically inside the measuring tube 2. A hole is made in the transformer oil conservator 1 to connect the inside of the measuring tube 2 with the oil inside the oil conservator. According to the principle of communicating vessels, after installation, the oil level in the measuring tube 2 is the same as the oil level in the transformer oil conservator 1. Therefore, by monitoring the oil level in the measuring tube 2, the oil level in the oil conservator can be monitored when the transformer is working normally.

[0041] The monitoring device in this application is simple to install and can be directly added to the existing transformer oil tank 1 with virtually no impact on its internal structure. It measures the oil level using an oil level measurement module and obtains the geographical location of the transformer oil tank 1 using a GPS positioning module. Simultaneously, a wireless communication module transmits the oil level data and geographical location information to a power remote monitoring platform. This device can replace manual inspection of the transformer oil tank 1's oil level, significantly reducing the workload and labor intensity of power maintenance personnel. Furthermore, since the oil level measurement module does not directly contact the bladder inside the transformer oil tank 1, it is unaffected by the bladder's breathing and pressure changes, ensuring reliable long-term monitoring data.

[0042] The control module in this application has a microprocessor and a memory, where the microprocessor is used to process data and the memory is used to pre-store data. The oil level measurement module includes a resistance bar 3 and a guide rod 4. The arrangement of the resistance bar 3 meets the oil level fluctuation range of the transformer during normal operation. One end of the resistance bar 3 is connected to the positive terminal of the power supply module, while the contact head 6 is connected to the negative terminal of the power supply module. When the oil level changes, the float 5 slides up and down along the guide rod 4. The contact position between the contact head 6 on the float 5 and the resistance bar 3 changes with the rise and fall of the float 5, causing a change in the current in the circuit. The control module converts the circuit current signal into the height of the oil level in the transformer oil conservator 1. Because the float always slides up and down along the guide rod in this measurement method, the float will not tilt due to local fluctuations in the oil level, which can eliminate the measurement error caused by local fluctuations in the oil level when the bladder expands and contracts. At the same time, combined with monitoring the circuit current signal, more accurate oil level measurement data can be obtained.

[0043] Specifically, the control module has multiple preset loop current values. When the contact head 6 contacts the resistor strip 3, the detected loop current signal is compared with the preset value to determine the specific contact position between the contact head 6 and the resistor strip 3, thus obtaining the oil level height, i.e., the first oil level data. This method can obtain accurate oil level data by comparing the loop current signal at a certain moment with the preset current data.

[0044] Because a GPS positioning module and a wireless communication module are installed, the GPS positioning module is used to obtain the geographical location information of transformer oil conservator 1, and the wireless communication module is used to transmit the first oil level data and geographical location information to the power remote monitoring platform. Once an abnormality is found in the oil level data on the power remote monitoring platform, the operation and maintenance personnel can go to the site in time to troubleshoot the relevant faults based on the geographical location information of transformer oil conservator 1 given by the GPS positioning module.

[0045] According to some embodiments of this application, the oil level measurement module further includes a laser ranging sensor 7 disposed on the top of the measuring tube 2. One end of the probe of the laser ranging sensor 7 faces the upper surface of the float 5. The control module obtains the second oil level data based on the data from the laser ranging sensor 7, calculates the difference between the second and first oil level data, and feeds back the difference to the power remote monitoring platform when the difference exceeds the first threshold.

[0046] Specifically, the laser rangefinder 7, installed at the top of the measuring tube 2, emits laser pulses towards the float 5. The laser pulses are reflected by the upper surface of the float 5 and received by the sensor. The distance from the sensor to the upper surface of the float 5 can be calculated, and the oil level height, i.e., the second oil level data, can be calculated based on the distance from the sensor to the bottom of the transformer oil tank 1 and the thickness of the float 5. Since the float always slides up and down along the guide rod, the float will not tilt due to local fluctuations in the oil level, thus obtaining more accurate oil level measurement data.

[0047] Meanwhile, in this application, the difference between the obtained second oil level data and the first oil level data is calculated. When the difference is small, it indicates that the two oil level measurement methods are operating normally. When the difference exceeds the first threshold, it is fed back to the power remote monitoring platform, indicating that there is an abnormality in the oil level measurement at this time. This mutually verifies whether the two oil level measurement methods have malfunctioned, improves the accuracy of oil level monitoring, and allows for timely investigation of the cause.

[0048] According to some embodiments of this application, an oil temperature measurement module is also included. The temperature probe 8 of the oil temperature measurement module is located near the bottom of the measuring tube 2. The control module obtains the corresponding standard oil level of the transformer oil conservator 1 based on the measured oil temperature value, and calculates the difference by comparing it with the measured oil level data. When the difference exceeds a second threshold, it is fed back to the power remote monitoring platform.

[0049] When a transformer is operating normally, the oil level and oil temperature relationship should conform to the oil level-oil temperature curve provided by the transformer and oil tank manufacturers, meaning there is a standard oil level corresponding to a certain oil temperature. The control module obtains the corresponding standard oil level of transformer oil tank 1 based on the oil temperature measured by the oil temperature measurement module. If a significant deviation is found between the measured oil level data and the corresponding standard oil level at that oil temperature, and the difference exceeds a second threshold, feedback is sent to the power remote monitoring platform, thereby monitoring whether the transformer is operating normally.

[0050] It should be noted that this application employs two oil level measurement methods to obtain first and second oil level data. When the difference between the two is small, the average value can be calculated and used as the oil level data for comparison with the corresponding standard oil level at the corresponding oil temperature. When the difference exceeds a first threshold, it indicates an abnormality in the oil level measurement. At this point, the comparison with the standard oil level is suspended, and feedback is sent to the power remote monitoring platform.

[0051] According to some embodiments of this application, an early warning module is also included. The early warning module includes a first probe 91 and a second probe 92 disposed on the measuring tube 2. The first probe 91 is positioned higher than the resistance strip 3, and the second probe 92 is positioned lower than the resistance strip 3. When the contact head 6 contacts the first probe 91 or the second probe 92, the control module sends an alarm message to the power remote monitoring platform.

[0052] The first probe 91 and the second probe 92 mentioned above are respectively set on the measuring tube 2 near the top and bottom. The first probe 91 and the second probe 92 are connected to the control module. When the float 5 rises and falls, causing the contact head 6 to contact the first probe 91 or the second probe 92, the control module sends an alarm message to the power remote monitoring platform. In this way, when the oil level of the transformer oil tank 1 is at an extremely low or extremely high level, a remote alarm can be issued in a timely manner. Based on the geographical location information of the transformer oil tank 1 given by the GPS positioning module, it is convenient for maintenance personnel to go to the site in a timely manner to troubleshoot related faults.

[0053] According to some embodiments of this application, the GPS positioning module is connected to the power equipment management system to synchronize transformer equipment information based on the geographical location information of transformer oil tank 1 given by the GPS positioning module, thereby directly feeding back the transformer equipment information and geographical location information to the power remote monitoring platform.

[0054] According to some embodiments of this application, the measuring tube 2 is fixed on the transformer oil conservator 1, and a connector 21 is provided on the lower side wall of the measuring tube 2. One end of the connector 21 is connected to the inside of the measuring tube 2, and the other end is connected to the inside of the transformer oil conservator 1. The outer wall of the connector 21 is sealed to the hole opened on the transformer oil conservator 1.

[0055] Specifically, the connector 21 is positioned horizontally near the bottom of the transformer oil conservator 1, so that the connection between the measuring tube 2 and the transformer oil conservator 1 is located below the capsule and at a certain distance from the capsule, and is not affected by the capsule's breathing pressure change. The oil level in the measuring tube 2 is always consistent with the oil level in the oil conservator.

[0056] During installation, insert the connector 21 into the oil conservator opening and set the sealing ring 22 to ensure that no leakage occurs from the opening. It can be fixed by setting the locking nut 23 on the inside of the oil conservator. At the same time, it is fixedly connected to the outside of the oil conservator by the fixing lug 26 on the outside of the measuring tube 2, so that the position of the measuring tube 2 remains stable after installation.

[0057] According to some embodiments of this application, a filter cover 24 is provided at one end of the connector 21 that extends into the transformer oil conservator 1. The filter cover 24 is used to filter the oil entering the measuring tube 2 through the connector 21. Since impurities may be generated inside the oil conservator during transformer operation, such as particles generated by bladder wear, by providing a filter cover 24 at the oil inlet of the connector 21, it is possible to prevent impurities from entering the measuring tube 2 and affecting the measuring elements, or causing the float 5 to slide uncomfortably along the guide rod 4. These issues would be detrimental to oil level monitoring.

[0058] According to some embodiments of this application, a positioning platform 25 is provided on the bottom wall inside the measuring tube 2, and a positioning hole is provided on the positioning platform 25. The lower end of the guide rod 4 is fitted into the positioning hole, and the guide rod 4 is kept arranged in the vertical direction.

[0059] According to some embodiments of this application, the guide rod 4 is a metal rod with a square cross-section, the float plate 5 is circular or square, and a through hole adapted to the guide rod 4 is provided at the center of the float plate 5, and the guide rod 4 is slidably inserted into the through hole.

[0060] In this application, by setting the metal rod to a square cross section, since the float 5 floats on the liquid surface, the float 5 will not rotate around the guide rod 4 when it slides up and down along the guide rod 4; at the same time, by using a metal guide rod 4, the guide rod 4 can be connected to the negative terminal of the power module, and the contact head 6 can contact the guide rod 4 through the inside of the float 5, thereby realizing the connection with the negative terminal of the power module, which simplifies the connection wires inside the measuring tube 2.

[0061] According to some embodiments of this application, an installation cylinder 61 is provided at one end of the contact head 6 that extends into the float 5. A ball bearing 62 is rotatably mounted on the end of the installation cylinder 61 facing the guide rod 4. After the float 5 is slidably fitted onto the guide rod 4, the ball bearing 62 contacts the guide rod 4. In this application, two contact heads 6 are symmetrically arranged on the float 5. One contact head 6 is used to contact the resistor strip 3, and the other contact head 6 is used to contact the first probe 91 or the second probe 92. Therefore, two installation cylinders 61 are also symmetrically arranged inside the float 5 of this application, which are respectively connected to the two contact heads 6.

[0062] By setting an installation cylinder 61 inside the float 5 and connecting it to the contact head 6, and rotatably installing a ball bearing 62 (steel ball) on the installation cylinder 61, after the float 5 is slidably fitted onto the guide rod 4, the ball bearing 62 contacts the guide rod 4, thereby making the float 5 slide up and down along the guide rod 4 more smoothly. At the same time, the guide rod 4, the ball bearing 62, the installation cylinder 61, and the contact head 6 can form an electrical connection, thereby simplifying the circuit connection and avoiding setting wires on the float 5, which would affect the lifting and lowering movement of the float 5.

[0063] According to some embodiments of this application, a compression spring 63 is provided inside the mounting cylinder 61. One end of the compression spring 63 abuts against the inner wall of the mounting cylinder 61, and the other end abuts against the ball bearing 62 to push the ball bearing 62 into contact with the guide rod 4. By providing a compression spring 63 inside the mounting cylinder 61, a certain pushing force can be generated on the ball bearing 62, thereby keeping the ball bearing 62 in contact with the guide rod 4.

[0064] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A transformer oil pillow oil level monitoring device, characterized by, The oil level measuring device comprises a measuring tube, an oil level measuring module, a GPS positioning module, a control module and a wireless communication module; the measuring tube is installed outside the oil pillow of the transformer and is in communication with the oil inside the oil pillow; the oil level measuring module comprises a resistance strip and a guide rod, both of which are vertically arranged in the measuring tube; the resistance strip is arranged at a position that meets the fluctuation range of the oil pillow oil level when the transformer is normally operating, and one end of the resistance strip is connected with the positive pole of the power module; a floating plate is slidably sleeved on the guide rod; a contact head is arranged on the floating plate; the contact position of the contact head with the resistance strip changes with the rising and falling of the floating plate; the contact head is connected with the negative pole of the power module; the control module obtains first oil level data according to the loop current signal of the position where the contact head is located; the GPS positioning module is used to obtain the geographical position information of the transformer oil pillow; the wireless communication module is used to transmit the first oil level data and the geographical position information to the power remote monitoring platform. The oil level measuring module further comprises a laser distance measuring sensor arranged at the top of the measuring tube; one end of the probe of the laser distance measuring sensor faces the upper surface of the floating plate; the control module obtains second oil level data according to the data of the laser distance measuring sensor, and calculates the difference value with the first oil level data; when the difference value exceeds the first threshold value, the feedback is transmitted to the power remote monitoring platform.

2. The transformer oil pillow level monitoring device of claim 1, wherein, The oil level measuring device further comprises an oil temperature measuring module; the temperature probe of the oil temperature measuring module is arranged at the bottom of the measuring tube; the control module obtains the corresponding standard oil level of the transformer oil pillow according to the measured oil temperature value, and compares the measured oil level data to calculate the difference value; when the difference value exceeds the second threshold value, the feedback is transmitted to the power remote monitoring platform.

3. The transformer oil pillow level monitoring device of claim 1, wherein, The oil level measuring device further comprises a warning module; the warning module comprises a first probe and a second probe arranged on the measuring tube; the position of the first probe is higher than that of the resistance strip; the position of the second probe is lower than that of the resistance strip; when the contact head is in contact with the first probe or the second probe, the control module sends an alarm information to the power remote monitoring platform.

4. The transformer oil pillow level monitoring device of claim 1, wherein, The measuring tube is fixed on the transformer oil pillow, and the side wall of the lower part of the measuring tube is provided with a connecting head; one end of the connecting head is in communication with the inside of the measuring tube, and the other end is in communication with the inside of the transformer oil pillow; the outer wall of the connecting head is sealed with the hole arranged on the transformer oil pillow.

5. The transformer oil pillow level monitoring device of claim 4, wherein, A filter cover is arranged on the end of the connecting head that extends into the inside of the transformer oil pillow; the filter cover is used to filter the oil entering the inside of the measuring tube through the connecting head.

6. The transformer oil pillow level monitoring device of claim 1, wherein, A positioning table is arranged on the inner bottom wall of the measuring tube; the positioning table is provided with a positioning hole; the lower end of the guide rod is fitted into the positioning hole, and the guide rod is kept arranged in the vertical direction.

7. The transformer oil pillow level monitoring device of claim 1, wherein, The guide rod is a metal rod with a square cross section; the floating plate is circular or square; a through hole that is matched with the guide rod is arranged at the center position of the floating plate; the guide rod is slidably arranged in the through hole.

8. The transformer oil pillow level monitoring device of claim 1, wherein, A mounting cylinder is arranged on the end of the contact head that extends into the floating plate; a ball is rotatably mounted on the end of the mounting cylinder that faces the guide rod; after the floating plate is slidably sleeved on the guide rod, the ball is in contact with the guide rod.

9. The transformer oil pillow level monitoring device of claim 8, wherein, A compression spring is installed inside the mounting cylinder. One end of the compression spring abuts against the inner wall of the mounting cylinder, and the other end abuts against the ball bearing, so as to push the ball bearing to contact the guide rod.

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