Mutual inductor oil level monitoring equipment and system

Abstract

The invention discloses a transformer oil level monitoring device and system, and belongs to the technical field of power equipment monitoring. The mutual inductor oil level monitoring equipment comprises a first detection capacitor which comprises a first positive patch electrode, and the arrangement position of the first positive patch electrode on the outer wall of a mutual inductor is higher than the oil level upper limit threshold value of insulating oil in the mutual inductor; the second detection capacitor comprises a second positive patch electrode, and the arrangement position of the second positive patch electrode on the outer wall of the mutual inductor is higher than the oil level lower limit threshold value of the insulating oil in the mutual inductor and lower than the arrangement position of the first positive patch electrode on the outer wall of the mutual inductor; the controller is respectively connected with the first positive patch electrode and the second positive patch electrode; the controller is used for determining whether the oil level of the insulating oil in the mutual inductor is located between the oil level lower limit threshold value and the oil level upper limit threshold value or not according to the capacitance value of the first detection capacitor and the capacitance value of the second detection capacitor. According to the embodiment of the invention, the oil level of the insulating oil in the mutual inductor can be monitored in real time, and oil level abnormity can be found in time.

Description

Technical Field

[0001] The present invention relates to the technical field of power equipment monitoring, and in particular to a transformer oil level monitoring device and system. Background Art

[0002] At present, the observation window of the metal expander on the top of the oil-immersed transformer can reflect the oil level of the insulating oil. A high oil level means that there is a heating fault inside the transformer, and a low oil level means that there is oil seepage or leakage in the transformer, which can easily cause insulation reduction. Therefore, the oil level monitoring of the transformer is very important. However, the high-definition cameras installed in the substation equipment area are not complete, and it is difficult to cover the oil level detection of each transformer. In addition, it is difficult to achieve continuous observation and tracking of oil level changes through manual inspection by operation and inspection personnel. The above problems may cause the transformer fault to be not discovered in time, seriously affecting the safe operation of substation equipment. Summary of the invention

[0003] The present invention provides a transformer oil level monitoring device and system to monitor the oil level of insulating oil in the transformer in real time, which is conducive to timely detection of oil level abnormalities, thereby performing relevant fault processing to improve the operating safety of the substation.

[0004] In a first aspect, an embodiment of the present invention provides a transformer oil level monitoring device, comprising:

[0005] A first detection capacitor, the first detection capacitor comprising a first positive patch electrode, wherein the first positive patch electrode is disposed on the outer wall of the transformer at a position higher than an upper threshold value of an oil level of insulating oil in the transformer;

[0006] A second detection capacitor, the second detection capacitor comprising a second positive patch electrode, the second positive patch electrode being disposed on the outer wall of the transformer at a position higher than a lower limit threshold of an oil level of insulating oil in the transformer and lower than a position of the first positive patch electrode on the outer wall of the transformer;

[0007] A controller is connected to the first positive patch electrode and the second positive patch electrode respectively; the controller is used to determine whether the oil level of the insulating oil in the mutual inductor is between the oil level lower limit threshold and the oil level upper limit threshold according to the capacitance of the first detection capacitor and the capacitance of the second detection capacitor.

[0008] Optionally, the first detection capacitor further includes: a first negative patch electrode, wherein a setting position of the first negative patch electrode on the outer wall of the transformer is lower than the oil level upper limit threshold and higher than a setting position of the second positive patch electrode on the outer wall of the transformer;

[0009] The second detection capacitor further includes: a second negative patch electrode, wherein the second negative patch electrode is disposed on the outer wall of the transformer at a position lower than the oil level lower limit threshold;

[0010] The controller is also connected to the first negative patch electrode and the second negative patch electrode.

[0011] Optionally, the mutual inductor includes an observation window; the first positive patch electrode, the first negative patch electrode, the second positive patch electrode and the second negative patch electrode are all arranged on the outer wall of the observation window.

[0012] Optionally, the transformer oil level monitoring device further includes: a solar power supply module, connected to the controller and used to supply power to the controller.

[0013] Optionally, the solar power supply module includes: a solar panel, a solar controller and an energy storage unit; the solar panel is connected to the solar controller, and the solar controller is respectively connected to the energy storage unit and the controller.

[0014] Optionally, the transformer oil level monitoring device further includes: a wireless communication module, connected to the controller and in communication with a host computer.

[0015] Optionally, the transformer oil level monitoring device further includes: a positioning module connected to the controller.

[0016] Optionally, the transformer oil level monitoring device further includes: an alarm module connected to the controller, wherein the controller is used to control the alarm module to alarm when it is determined that the oil level of the insulating oil in the transformer is lower than the oil level lower limit threshold or higher than the oil level upper limit threshold.

[0017] In a second aspect, an embodiment of the present invention further provides a transformer oil level monitoring system, comprising: a transformer oil level monitoring device provided by any embodiment of the present invention.

[0018] Optionally, the transformer oil level monitoring system includes a plurality of transformer oil level monitoring devices, each transformer oil level monitoring device is arranged in one-to-one correspondence with each transformer in the substation; each transformer oil level monitoring device includes a wireless communication module;

[0019] The transformer oil level monitoring system also includes: a signal relay machine and a host computer; the wireless communication modules in each transformer oil level monitoring device are communicatively connected to the signal relay machine, and the signal relay machine is communicatively connected to the host computer.

[0020] In the transformer oil level monitoring device provided by the embodiment of the present invention, a first detection capacitor and a second detection capacitor are arranged on the outer wall of the transformer, and the setting height of the first positive patch electrode is set to be higher than the upper limit threshold of the oil level, and the setting height of the second positive patch electrode is between the lower limit threshold of the oil level and the setting height of the first positive patch electrode, so as to ensure that the oil level detection range covered by the two detection capacitors exceeds and completely covers the safety range between the lower limit threshold of the oil level and the upper limit threshold of the oil level, so as to ensure that all kinds of oil level abnormalities can be reliably detected. The controller can continuously detect the capacitance of the two detection capacitors at a certain frequency to realize continuous tracking and monitoring of oil level changes, so as to timely discover oil level abnormalities, and the operation and maintenance personnel can timely perform relevant fault processing according to the monitoring results, so as to improve the operation safety of the substation. In addition, the transformer oil level monitoring device provided by the embodiment of the present invention does not need to install a light / displacement sensor inside the transformer to detect the oil level, does not need to modify the structure of the transformer, does not destroy the original structural strength of the transformer, is easy to install, easy to use, has a wide range of applicability, and can avoid problems such as oil leakage caused by equipment installation. In addition, the embodiment of the present invention uses the capacitance monitoring of the detection capacitor to obtain the oil level status, without the need for visual processing. This can simplify the analysis process and avoid detection result errors caused by complex calculation processes. Secondly, it can expand the scope of application of the device, and the oil level can be effectively monitored regardless of whether the transformer is equipped with an observation window.

[0021] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 It is a structural schematic diagram of a transformer oil level monitoring device provided by an embodiment of the present invention;

[0024] Figure 2 is a structural schematic diagram of another transformer oil level monitoring device provided by an embodiment of the present invention;

[0025] Figure 3 is a schematic diagram of the arrangement position of a patch electrode provided by an embodiment of the present invention;

[0026] Figure 4 It is a structural schematic diagram of a transformer oil level monitoring system provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0028] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0029] The embodiment of the present invention provides a transformer oil level monitoring device, which uses a detection capacitor arranged on the outer wall of the transformer to detect the oil level of insulating oil in the transformer, so as to detect oil level abnormality in time. Figure 1 Schematic diagram of a transformer oil level monitoring device provided by an embodiment of the present invention. Figure 1 The transformer oil level monitoring device includes: a first detection capacitor, a second detection capacitor and a controller 30.

[0030] The first detection capacitor includes a first positive patch electrode 11, and the setting position of the first positive patch electrode 11 on the outer wall of the transformer 100 is higher than the upper limit threshold value LH of the oil level of the insulating oil in the transformer 100. The second detection capacitor includes a second positive patch electrode 21, and the setting position of the second positive patch electrode 21 on the outer wall of the transformer 100 is higher than the lower limit threshold value LL of the oil level of the insulating oil in the transformer 100, and lower than the setting position of the first positive patch electrode 11 on the outer wall of the transformer 100. The controller 30 is connected to the first positive patch electrode 11 and the second positive patch electrode 21 respectively; the controller 30 is used to determine whether the oil level of the insulating oil in the transformer 100 is between the lower limit threshold value LL and the upper limit threshold value LH of the oil level according to the capacitance of the first detection capacitor and the capacitance of the second detection capacitor.

[0031] Among them, each patch electrode can be attached to the outer wall of the transformer 100 by attaching; each patch electrode can be made of any conductive material, such as metal. For example, the earth can be used as the negative electrode, and each positive patch electrode can form a capacitor with the ground. For any detection capacitor: when the oil level of the insulating oil in the transformer 100 is higher than the setting position of its positive patch electrode, the medium between the two plates of the detection capacitor includes the outer wall of the transformer 100 and the insulating oil; when the oil level of the insulating oil in the transformer 100 is lower than the setting position of its positive patch electrode, the medium between the two plates of the detection capacitor includes the outer wall of the transformer 100, air and insulating oil, and when the oil level is different, the ratio of air and insulating oil in the medium is also different; the change of the medium between the two plates of the detection capacitor will cause the capacitance of the detection capacitor to change. Based on the above principle, the embodiment of the present invention can determine the oil level according to the capacitance of the detection capacitor.

[0032] Among them, the oil level upper threshold LH is higher than the oil level lower threshold LL. The oil level upper threshold LH is the upper limit of the safety range of the insulating oil level in the transformer, and the oil level lower threshold LL is the lower limit of the safety range of the insulating oil level in the transformer; if the oil level is detected to be higher than the oil level upper threshold LH, it indicates that there is a heating fault inside the transformer 100; if the oil level is detected to be lower than the oil level lower threshold LL, it indicates that there are problems such as oil seepage or oil leakage in the transformer 100, which may easily cause insulation reduction; if the oil level is detected to be between the oil level lower threshold LL and the oil level upper threshold LH, it indicates that the oil level is within the safety range and the transformer 100 is operating normally. In this embodiment, the first positive patch electrode 11 is arranged on the outer wall of the transformer 100 at a position higher than the upper oil level threshold LH, so that it is possible to determine whether the oil level reaches / exceeds the upper oil level threshold LH according to the capacitance of the first detection capacitor; the second positive patch electrode 21 is arranged on the outer wall of the transformer 100 at a position higher than the lower oil level threshold LL of the insulating oil in the transformer 100, so that it is possible to determine whether the oil level drops below the lower oil level threshold LL according to the capacitance of the second detection capacitor; in this way, it can be ensured that the oil level detection range covered by the two detection capacitors is larger than the safe range of the insulating oil level in the transformer, so as to meet the detection requirements of various oil level abnormalities such as excessively high and low oil levels. Furthermore, since there is usually a certain distance between the upper oil level threshold LH and the lower oil level threshold LL, by setting the second positive patch electrode 21 on the outer wall of the transformer 100 to be lower than the first positive patch electrode 11 on the outer wall of the transformer 100, it is equivalent to setting the second positive patch electrode 21 closer to the lower oil level threshold LL, so that the second positive patch electrode 21 can be more sensitive to the oil level change at a height near the lower oil level threshold LL, so that the judgment of whether the oil level is lower than the lower oil level threshold LL is more accurate. Exemplarily, the distance between the setting of the first positive patch electrode 11 on the outer wall of the transformer 100 and the upper oil level threshold LH, and the distance between the setting position of the second positive patch electrode 21 on the outer wall of the transformer 100 and the lower oil level threshold LL can be set to be less than the preset distance, so as to ensure that the monitoring device is more sensitive to the oil level change at a height near the upper oil level threshold LH and the lower oil level threshold LL, thereby improving the accuracy of oil level judgment.

[0033] The controller 30 can determine the capacitance of the first detection capacitor according to the signal transmitted on the first positive patch electrode 11, and determine the capacitance of the second detection capacitor according to the signal transmitted on the second positive patch electrode 21. For example, the controller 30 can use a timer to measure the charging time of the capacitor to obtain the capacitance of the capacitor, or use a resonance method to measure the capacitance of the capacitor, or use any existing method to measure the capacitance of the two detection capacitors. The specific measurement method is not limited here. In addition, the controller 30 can store the corresponding relationship between the two detection capacitors and the oil level respectively; according to the capacitance and corresponding relationship of the two detection capacitors, the oil level in the mutual inductor 100 can be determined. Exemplarily, the controller 30 can store the corresponding relationship between the capacitance of the two detection capacitors and the oil level respectively, so that after obtaining the capacitance of the two detection capacitors, the current oil level is determined according to the capacitance, and then the current oil level is compared with the upper limit threshold LH of the oil level and the lower limit threshold LL of the oil level to determine whether the current oil level is within a safe range. Alternatively, the controller 30 may store the first capacitance of the first detection capacitor when the oil level reaches the upper oil level threshold LH, and store the second capacitance of the second detection capacitor when the oil level reaches the lower oil level threshold LL; after obtaining the capacitance of the two detection capacitors, the current capacitance of the first detection capacitor may be compared with the first capacitance to determine whether the current oil level exceeds the upper oil level threshold LH, and the current capacitance of the second detection capacitor may be compared with the second capacitance to determine whether the current oil level is lower than the lower oil level threshold LL. The specific processing process of the controller 30 determining the oil level according to the capacitance is not limited here, and can be set according to needs in actual applications.

[0034] Exemplarily, the controller 30 may include a single chip microcomputer. Exemplarily, a conversion chip may be provided in the controller 30 for converting the input capacitance to ground into a voltage signal output; the capacitance to ground may be understood as the capacitance to ground of any positive patch electrode, that is, the capacitance of any detection capacitor; the conversion chip may specifically be a capacitance / voltage linear conversion integrated circuit chip CAV444.

[0035] In the transformer oil level monitoring device provided by the embodiment of the present invention, a first detection capacitor and a second detection capacitor are arranged on the outer wall of the transformer 100, and the setting height of the first positive patch electrode 11 is set higher than the upper limit threshold value LH of the oil level, and the setting height of the second positive patch electrode 21 is set between the lower limit threshold value LL of the oil level and the setting height of the first positive patch electrode 11, which can ensure that the oil level detection range covered by the two detection capacitors exceeds and completely covers the safety range between the lower limit threshold value LL of the oil level and the upper limit threshold value LH of the oil level, so as to ensure that all kinds of oil level anomalies can be reliably detected. The controller 30 can continuously detect the capacitance of the two detection capacitors at a certain frequency to realize continuous tracking and monitoring of oil level changes, so as to timely discover oil level anomalies, and the operation and maintenance personnel can timely perform relevant fault processing according to the monitoring results, thereby improving the operation safety of the substation. Furthermore, the transformer oil level monitoring device provided in the embodiment of the present invention does not need to install a light / displacement sensor inside the transformer to detect the oil level, does not need to modify the structure of the transformer 100, does not destroy the original structural strength of the transformer 100, is easy to install, easy to use, has a wide range of applicability, and can avoid problems such as oil leakage caused by equipment installation. In addition, the embodiment of the present invention uses the capacitance monitoring of the detection capacitor to obtain the oil level, and does not need to use visual processing. On the one hand, it can simplify the analysis process and avoid the error of the detection result caused by the complex calculation process. On the other hand, it can expand the scope of application of the device, and the oil level can be effectively monitored regardless of whether the transformer 100 is equipped with an observation window.

[0036] Figure 2 Schematic diagram of another transformer oil level monitoring device provided by an embodiment of the present invention. Figure 2 On the basis of the above embodiments, optionally, the first detection capacitor 10 further includes: a first negative patch electrode 12, and the setting position of the first negative patch electrode 12 on the outer wall of the mutual inductor 100 is lower than the upper limit threshold value LH of the oil level, and higher than the setting position of the second positive patch electrode 21 on the outer wall of the mutual inductor 100. This arrangement of the present embodiment can effectively shorten the distance between the two electrodes of the first detection capacitor 10, so that the first detection capacitor 10 is dedicated to detecting the oil level near the upper limit threshold value LH of the oil level, which is conducive to improving the detection accuracy of whether the oil level exceeds the upper limit threshold value LH of the oil level. Exemplarily, the distance between the first positive patch electrode 11 and the upper limit threshold value LH of the oil level, and the distance between the first negative patch electrode 12 and the upper limit threshold value LH of the oil level, are both less than the preset distance.

[0037] The second detection capacitor 20 also includes: a second negative patch electrode 22, and the second negative patch electrode 22 is set on the outer wall of the transformer 100 at a position lower than the oil level lower limit threshold LL. This embodiment is set in this way, which can effectively shorten the distance between the two electrodes of the second detection capacitor 20, so that the second detection capacitor 20 is dedicated to detecting the oil level near the oil level lower limit threshold LL, which is conducive to improving the detection accuracy of whether the oil level is lower than the oil level lower limit threshold LL. Exemplarily, the distance between the second positive patch electrode 21 and the oil level lower limit threshold LL, and the distance between the second negative patch electrode 22 and the oil level lower limit threshold LL, are both less than the preset distance.

[0038] And, the controller 30 is also connected to the first negative patch electrode 12 and the second negative patch electrode 22. The controller 30 can determine the capacitance of the first detection capacitor 10 according to the signal transmitted by the first positive patch electrode 11 and the signal transmitted by the first negative patch electrode 12, and determine the capacitance of the second detection capacitor 20 according to the signal transmitted by the second positive patch electrode 21 and the signal transmitted by the second negative patch electrode 22.

[0039] Figure 3 Schematic diagram of the arrangement position of a patch electrode provided by an embodiment of the present invention. Figure 3 The mutual inductor 100 may specifically include: a metal expander 101, a main body 102 and an oil tank 103. Figure 3 The right side is an enlarged schematic diagram of the metal expander 101. Among them, a primary winding can be arranged in the main body 102, and a secondary winding can be arranged in the oil tank 103. The transformer can be an oil-immersed positive vertical current transformer. The transformer includes an observation window 1011, and the observation window 1011 can be specifically arranged on the metal expander 101. The observation window can be made of transparent insulating materials such as glass. The observation window 1011 is marked with an upper oil level threshold LH and a lower oil level threshold LL, and there can also be an oil level scale on the observation window 1011 (not shown here). The first positive patch electrode 11, the first negative patch electrode 12, the second positive patch electrode 21 and the second negative patch electrode 22 can all be arranged on the outer wall of the observation window 1011.

[0040] In this embodiment, since the volume of each patch electrode itself is small and none of them is arranged in parallel with the upper limit threshold value LH of the oil level and the lower limit threshold value LL of the oil level, the observation window 1011 will not be blocked, and the operation and maintenance personnel will not be affected from observing the oil level through the observation window 1011. In addition, since the observation window 1011 is made of an insulating material with a large dielectric constant, compared with directly attaching the patch electrode to the outer shell of the metal expander 101 with a small dielectric constant, the effect of the oil level change on the capacitance value can be more obvious, making the oil level change easier to detect.

[0041] Continue to see Figure 2On the basis of the above embodiments, the transformer oil level monitoring device may optionally further include: a solar power supply module 40 connected to the controller 30 for supplying power to the controller 30. Also, when there are other electrical devices in the device, they may also be supplied by the solar power supply module 40. In this way, the entire device can be self-sufficient in electrical energy, and is suitable for long-term outdoor operations.

[0042] Specifically, the solar power supply module 40 includes: a solar panel 41, a solar controller 42 and an energy storage unit 43. The solar panel 41 is connected to the solar controller 42, and the solar controller 42 is respectively connected to the energy storage unit 43 and the controller 30. Exemplarily, the solar panel 41 can be installed on a pole set in the substation through a mounting bracket. When the solar panel 41 is exposed to light, the charge distribution state inside the panel changes, thereby generating a certain electromotive force and current, which are then transmitted to the solar controller 42 through a cable. The solar controller 42 is a core component in the solar power supply module 40, which centrally manages and monitors components such as the solar panel 41, the energy storage unit 43 and the load in real time. The energy storage unit 43 may include a battery pack, which is used to store the excess electrical energy generated by the solar panel 41 when it is exposed to light, and to supply power at any time when the DC load needs it. The solar controller 42 can control the charging process of the energy storage unit 43 according to the light intensity to avoid overcharging; and when the energy storage unit 43 is discharging, the solar controller 42 can ensure that the energy storage unit 43 will not be over-discharged, thereby increasing the service life of the energy storage unit 43.

[0043] Continue to see Figure 2 On the basis of the above-mentioned embodiments, the transformer oil level monitoring device may also include: a wireless communication module 50, connected to the controller 30, and communicated with the host computer (not shown in the figure). For example, a management platform may be configured in the host computer, and the controller 30 may upload the monitoring data to the host computer in the control room by wireless communication through the wireless communication module 50, thereby realizing remote monitoring of the transformer oil level. Also, when a plurality of transformers 100 are equipped in a substation, the transformer oil level monitoring devices equipped with each transformer 100 upload the monitoring data to the host computer, which is conducive to unified monitoring and deployment of the operation of each transformer 100 through the management platform. For example, the wireless communication module 50 may include an NRF24L01 wireless communication chip. The wireless communication module 50 may be powered by a solar power supply module 40.

[0044] Continue to see Figure 2On the basis of the above-mentioned embodiments, optionally, the transformer oil level monitoring device further includes: a positioning module 60, connected to the controller 30. The positioning module 60 is installed near the transformer 100 and is used to detect the position of the transformer 100. The monitoring data uploaded by the controller 30 may include the position information of the sensor 100, so that the operation and maintenance personnel can locate the faulty transformer in time and perform maintenance after the fault is found. Exemplarily, the positioning module 60 can be installed together with each patch electrode, and the positioning module 60 can specifically be a GPS module. The positioning module 60 can be powered by the solar power supply module 40.

[0045] Continue to see Figure 2 On the basis of the above embodiments, optionally, the transformer oil level monitoring device further includes: an alarm module 70 connected to the controller 30. The controller 30 is used to control the alarm module 70 to alarm when it is determined that the oil level of the insulating oil in the transformer is lower than the oil level lower limit threshold LL or higher than the oil level upper limit threshold LH, so as to prompt the operation and maintenance personnel to perform maintenance as soon as possible. Exemplarily, the alarm module 70 may include at least one of a light-emitting diode, a buzzer and a vibrator to give an alarm by at least one of light, sound and vibration. The alarm module 70 may be installed near the transformer 100, and the alarm module 70 may be powered by the solar power supply module 40.

[0046] In summary, the embodiment of the present invention provides a transformer oil level monitoring device capable of realizing remote monitoring, and the device is composed of a first detection capacitor 10, a second detection capacitor 20, a controller 30, a solar power supply module 40, a wireless communication module 50, a positioning module 60 and an alarm module 70. The device is mainly used in the operation and maintenance of oil-immersed transformers in substations. The device is installed at the oil level observation window of the oil-immersed transformer. It uses solar power to monitor the transformer oil level status online in real time and transmits abnormal oil level values ​​back to the management platform / monitoring center of the host computer. The device can be used to timely detect the oil level of the oil-immersed transformer that is too high due to heat or the oil level that is too low due to oil seepage and oil leakage during operation and maintenance, so as to avoid heating or insulation accidents caused by too high or too low oil level, and improve the operation and maintenance level of substation equipment. In this device, the patch electrode of the detection capacitor is placed on the outside of the oil level observation window of the metal expander. The principle that the increase or decrease of the oil level will change the capacitance of the capacitor is used. The detection capacitor capacitance read by the controller 30 reflects the transformer oil level. It has many advantages such as low cost, no external wiring, no damage to the transformer structure, no impact on the existing operating mode, small size, no obstruction of the observation window, accurate oil level response and reliable wireless transmission.

[0047] An embodiment of the present invention further provides a transformer oil level monitoring system, including the transformer oil level monitoring device provided by any embodiment of the present invention, and having corresponding beneficial effects.

[0048] Figure 4 Schematic diagram of a transformer oil level monitoring system provided by an embodiment of the present invention. Figure 4 For example, a plurality of transformers 100 may be provided in a transformer substation, and a plurality of transformer oil level monitoring devices 200 may be included in a transformer oil level monitoring system. Each transformer oil level monitoring device 200 is provided in one-to-one correspondence with each transformer 100 in the transformer substation, and each transformer oil level monitoring device 200 includes a wireless communication module 50. Networking between each transformer oil level monitoring device 200 can be achieved through each wireless communication module 50. Specifically, the transformer oil level monitoring system also includes: a signal relay machine 300 and a host computer 400; the wireless communication module 50 in each transformer oil level monitoring device 200 is connected to the signal relay machine 300 for communication, and the signal relay machine 300 is connected to the host computer 400 for communication.

[0049] Among them, each wireless communication module 50 can collect the monitoring data provided by the controller 30 in each transformer oil level monitoring device 200 to the signal relay 300 through wireless communication; the signal relay 300 can send the collected data to the receiver (i.e., the host computer 400) of the remote operation and inspection unit through wired or wireless communication. The host computer 400 can be configured with a management platform / monitoring center to process and analyze the monitoring data. In addition, the signal relay 300 can also provide auxiliary contacts for subsequent expansion of the station's measurement and control devices.

[0050] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0051] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A transformer oil level monitoring device, characterized in that: include: A first detection capacitor, the first detection capacitor comprising a first positive patch electrode, wherein the first positive patch electrode is disposed on the outer wall of the transformer at a position higher than an upper threshold value of an oil level of insulating oil in the transformer; a second detection capacitor, the second detection capacitor comprising a second positive patch electrode, the second positive patch electrode being disposed at a position on the outer wall of the transformer higher than a lower limit threshold of an oil level of insulating oil in the transformer and lower than a position on the outer wall of the transformer of the first positive patch electrode; A controller is connected to the first positive patch electrode and the second positive patch electrode respectively; the controller is used to determine whether the oil level of the insulating oil in the mutual inductor is between the oil level lower limit threshold and the oil level upper limit threshold according to the capacitance of the first detection capacitor and the capacitance of the second detection capacitor.

2. The transformer oil level monitoring device according to claim 1, characterized in that: The first detection capacitor further includes: a first negative patch electrode, wherein the setting position of the first negative patch electrode on the outer wall of the transformer is lower than the upper oil level threshold and higher than the setting position of the second positive patch electrode on the outer wall of the transformer; The second detection capacitor further includes: a second negative patch electrode, wherein the second negative patch electrode is disposed at a position on the outer wall of the transformer lower than the oil level lower limit threshold; The controller is also connected to the first negative patch electrode and the second negative patch electrode.

3. The transformer oil level monitoring device according to claim 2, characterized in that: The mutual inductor comprises an observation window; the first positive patch electrode, the first negative patch electrode, the second positive patch electrode and the second negative patch electrode are all arranged on the outer wall of the observation window.

4. The transformer oil level monitoring device according to any one of claims 1 to 3, characterized in that: Also includes: A solar power supply module is connected to the controller and is used to supply power to the controller.

5. The transformer oil level monitoring device according to claim 4, characterized in that: The solar power supply module includes: a solar panel, a solar controller and an energy storage unit; the solar panel is connected to the solar controller, and the solar controller is respectively connected to the energy storage unit and the controller.

6. The transformer oil level monitoring device according to any one of claims 1 to 3, characterized in that: Also includes: The wireless communication module is connected to the controller and communicates with the host computer.

7. The transformer oil level monitoring device according to any one of claims 1 to 3, characterized in that: Also includes: A positioning module is connected to the controller.

8. The transformer oil level monitoring device according to any one of claims 1 to 3, characterized in that: Also includes: An alarm module is connected to the controller, and the controller is used to control the alarm module to alarm when it is determined that the oil level of the insulating oil in the transformer is lower than the oil level lower limit threshold or higher than the oil level upper limit threshold.

9. A transformer oil level monitoring system, characterized in that: include: The transformer oil level monitoring device according to any one of claims 1 to 8.

10. The transformer oil level monitoring system according to claim 9, characterized in that: The transformer oil level monitoring system includes a plurality of transformer oil level monitoring devices, each transformer oil level monitoring device is arranged in one-to-one correspondence with each transformer in the substation; each transformer oil level monitoring device includes a wireless communication module; The transformer oil level monitoring system also includes: a signal relay machine and a host computer; the wireless communication modules in each transformer oil level monitoring device are communicatively connected to the signal relay machine, and the signal relay machine is communicatively connected to the host computer.

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