Monitoring system for oil level of transformer expansion tank

Abstract

The invention provides a transformer oil conservator oil level monitoring system which comprises a pressure detection module, the detection end of the pressure detection module is arranged at the bottom of an oil conservator of a transformer, and the pressure detection module is used for detecting the oil pressure at the bottom of the oil conservator; the signal input end of the monitoring module is connected with the signal output end of the pressure detection module, and the monitoring module is used for obtaining the liquid level of oil in the oil conservator according to the pressure of the oil at the bottom of the oil conservator and based on a corresponding model of the pressure and the oil level; the signal input end of the alarm module is connected with the signal output end of the monitoring module, and the alarm module is used for sending out first alarm information when the liquid level of oil in the oil conservator exceeds the preset oil level range. According to the monitoring system for the oil level of the oil conservator of the transformer, through the arrangement of the pressure detection module, safe and stable operation of the transformer can be guaranteed while the oil level of the oil conservator of the transformer is monitored.

Description

Technical Field

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

[0002] Monitoring the oil level in the transformer conservator plays a very important role in the normal operation of oil-immersed transformers with voltage levels of 110kV and above. At present, most oil-immersed transformers with voltage levels of 110kV and above have rope-type or rod-type oil level sensors installed inside the oil conservator. However, since the rope-type or rod-type oil level sensors of the operating transformers are installed on the top of the transformer more than 3m high and there are exposed live wires on the top, it is impossible to check and handle abnormalities and faults in the sensor body. At the same time, the rope-type or rod-type oil level sensors are extremely easy to damage the line resistance of the transformer and the reactor body with large vibration, which seriously affects the safe and stable operation of the transformer. Summary of the Invention

[0003] The present disclosure aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, the present disclosure aims to provide a transformer conservator oil level monitoring system.

[0005] To achieve the above-mentioned objectives, the present disclosure provides a transformer oil pillow oil level monitoring system, comprising: a pressure detection module, the detection end of the pressure detection module is arranged at the bottom of the oil pillow of the transformer, and the pressure detection module is used to detect the oil pressure at the bottom of the oil pillow; a monitoring module, the signal input end of the monitoring module is connected to the signal output end of the pressure detection module, and the monitoring module is used to obtain the oil level in the oil pillow according to the oil pressure at the bottom of the oil pillow and based on a corresponding model of pressure and oil level; an alarm module, the signal input end of the alarm module is connected to the signal output end of the monitoring module, and the alarm module is used to issue a first alarm message when the oil level in the oil pillow exceeds a preset oil level range.

[0006] Optionally, the corresponding model of the pressure and oil level includes the following formula: Wherein, H is the oil level in the oil pillow, P is the oil pressure at the bottom of the oil pillow, ρ is the density of the oil, and g is the acceleration due to gravity.

[0007] Optionally, the pressure detection module includes: a first pressure sensor, the detection end of the first pressure sensor is arranged at the bottom of the oil pillow, and the first pressure sensor is used to detect the first pressure at the bottom of the oil pillow; a second pressure sensor, the detection end of the second pressure sensor is arranged at the bottom of the oil pillow, and the second pressure sensor is used to detect the second pressure at the bottom of the oil pillow; wherein the signal input end of the monitoring module is respectively connected to the signal output end of the first pressure sensor and the signal output end of the second pressure sensor, and the monitoring module is used to obtain the oil pressure at the bottom of the oil pillow based on the first pressure and the second pressure.

[0008] Optionally, the monitoring module is used to use the average pressure of the first pressure and the second pressure as the oil pressure at the bottom of the oil pillow when the difference between the first pressure and the second pressure does not exceed a first preset value, and to control the alarm module to issue a second alarm message when the difference between the first pressure and the second pressure exceeds a first preset value.

[0009] Optionally, the monitoring module is used to control the alarm module to issue a second alarm message when the difference between the first pressure and the second pressure exceeds a first preset value and does not exceed a second preset value; and, when the difference between the first pressure and the second pressure exceeds a second preset value, use the maximum value of the first pressure and the second pressure as the oil pressure at the bottom of the oil pillow and control the alarm module to issue a third alarm message; wherein, the first preset value is less than the second preset value.

[0010] Optionally, the system also includes: a temperature detection module, the detection end of the temperature detection module is arranged in the oil pillow of the transformer, and the temperature detection module is used to detect the oil temperature in the oil pillow; wherein, the signal input end of the monitoring module is connected to the signal output end of the temperature detection module, and the monitoring module is used to compensate for the oil level in the oil pillow obtained based on the difference between the oil temperature in the oil pillow and the base temperature.

[0011] Optionally, the monitoring module is used to record the oil level in the oil pillow along a preset timeline, and obtain the oil level change trend in the oil pillow based on the recorded multiple oil levels and the preset timeline, and predict the oil level change in the oil pillow based on the oil level change trend in the oil pillow.

[0012] Optionally, the system also includes: a tee, a first end of the tee being connected to the bottom of the oil pillow of the transformer, and a second end of the tee being connected to the detection end of the pressure detection module; a chromatographic detection module, a detection end of the chromatographic detection module being connected to the third end of the tee, and a signal output end of the chromatographic detection module being connected to a signal input end of the monitoring module, and the chromatographic detection module being used to detect the oil chromatography in the oil pillow.

[0013] Optionally, the monitoring module includes: a signal amplifying unit, the signal input end of the signal amplifying unit is connected to the signal output end of the pressure detection module, and the signal amplifying unit is used to amplify the pressure signal; a filtering unit, the signal input end of the filtering unit is connected to the signal output end of the signal amplifying unit, and the filtering unit is used to filter the pressure signal; an analog-to-digital conversion unit, the signal input end of the analog-to-digital conversion unit is connected to the signal output end of the filtering unit, and the analog-to-digital conversion unit is used for analog-to-digital conversion of the pressure signal; a control unit, the signal input end of the control unit is connected to the signal output end of the analog-to-digital conversion unit, and the signal output end of the control unit is connected to the signal input end of the alarm module, the control unit is used to obtain the oil level in the oil pillow according to the oil pressure at the bottom of the oil pillow and based on the corresponding model of pressure and oil level, and control the alarm module to issue a first alarm message when the oil level in the oil pillow exceeds a preset oil level range.

[0014] Optionally, the monitoring module further includes: a protocol converter, a signal input end of the protocol converter is connected to a signal output end of the control unit, and the protocol converter is used for uploading data to the control unit.

[0015] The technical solutions provided by the present disclosure may have the following beneficial effects:

[0016] Because the pressure detection module's detection end is located at the bottom of the transformer's oil conservator, it avoids exposed live wires on the top of the transformer. This makes it easier to inspect and handle any abnormalities or failures in the pressure detection module. Furthermore, compared to pull-rod or pull-rod oil level sensors, the pressure detection module at the bottom of the oil conservator is more adaptable to vibration environments. Therefore, the placement of the pressure detection module not only enables oil level monitoring in the transformer conservator, but also ensures safe and stable operation of the transformer.

[0017] Additional aspects and advantages of the present disclosure will be given in part in the description below and in part will be obvious from the description below, or will be learned through practice of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present disclosure will become apparent and readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0019] Figure 1 1 is a schematic structural diagram of a transformer conservator oil level monitoring system according to an embodiment of the present disclosure;

[0020] Figure 2 1 is a circuit diagram of a transformer conservator oil level monitoring system according to an embodiment of the present disclosure;

[0021] As shown in the figure: 1. pressure detection module, 11. first pressure sensor, 12. second pressure sensor;

[0022] 2. Monitoring module, 21. Signal amplification unit, 22. Filtering unit, 23. Analog-to-digital conversion unit, 24. Control unit, 25. Protocol converter;

[0023] 3. Alarm module, 4. Temperature detection module, 5. Chromatographic detection module;

[0024] 100. Transformer. DETAILED DESCRIPTION

[0025] The following describes in detail embodiments of the present disclosure, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present disclosure and are not to be construed as limiting the present disclosure. On the contrary, the embodiments of the present disclosure include all variations, modifications, and equivalents that fall within the spirit and scope of the appended claims.

[0026] like Figure 1 and Figure 2 As shown, the embodiment of the present disclosure proposes a monitoring system for the oil level of the oil pillow of the transformer 100, including: a pressure detection module 1, a monitoring module 2 and an alarm module 3. The detection end of the pressure detection module 1 is set at the bottom of the oil pillow of the transformer 100, and the pressure detection module 1 is used to detect the oil pressure at the bottom of the oil pillow, the signal input end of the monitoring module 2 is connected to the signal output end of the pressure detection module 1, and the monitoring module 2 is used to obtain the oil level in the oil pillow according to the oil pressure at the bottom of the oil pillow and based on the corresponding model of pressure and oil level, the signal input end of the alarm module 3 is connected to the signal output end of the monitoring module 2, and the alarm module 3 is used to issue a first alarm message when the oil level in the oil pillow exceeds a preset oil level range.

[0027] It can be understood that since the detection end of the pressure detection module 1 is arranged at the bottom of the oil pillow of the transformer 100, and the signal input end of the monitoring module 2 is connected to the signal output end of the pressure detection module 1, the monitoring module 2 can use the pressure detection module 1 to obtain the oil pressure at the bottom of the oil pillow, and obtain the oil level in the oil pillow according to the oil pressure at the bottom of the oil pillow and based on the corresponding model of pressure and oil level, thereby realizing the monitoring of the oil level of the oil pillow of the transformer 100, and then cooperating with the alarm module 3 to ensure the safe use of fluid in the transformer 100.

[0028] At the same time, because the detection end of the pressure detection module 1 is set at the bottom of the oil conservator of the transformer 100, it avoids the exposed live wires on the top of the transformer 100, making it easier to check and handle abnormalities and failures in the pressure detection module 1. At the same time, compared with rope-type or rod-type oil level sensors, the pressure detection module 1 at the bottom of the oil conservator has stronger adaptability to vibration environments. Therefore, through the arrangement of the pressure detection module 1, the oil level of the transformer 100 can be monitored while ensuring the safe and stable operation of the transformer 100.

[0029] It should be noted that the pressure detection module 1 is used to detect the oil pressure at the bottom of the oil pillow. The specific type of the pressure detection module 1 can be set according to actual needs and is not limited to this.

[0030] The monitoring module 2 is used to obtain the oil level in the oil pillow according to the oil pressure at the bottom of the oil pillow, as well as to monitor and warn the oil level in the oil pillow. The specific type of the monitoring module 2 can be set according to actual needs and is not limited to this.

[0031] The alarm module 3 sends out the first alarm information. The specific type of the alarm module 3 can be set according to actual needs and is not limited to this. For example, the alarm module 3 can be an audible and / or visual alarm.

[0032] In some embodiments, the corresponding model of pressure and oil level includes the following formula:

[0033] ;

[0034] Where H is the oil level in the pillow, P is the oil pressure at the bottom of the pillow, ρ is the density of the oil, and g is the acceleration due to gravity.

[0035] It can be understood that the monitoring module 2 is based on the oil pressure at the bottom of the oil pillow detected by the pressure detection module 1, as well as the density and gravity acceleration of the oil, and uses the above formula to accurately obtain the oil level in the oil pillow, thereby realizing the oil level monitoring of the transformer 100 oil pillow.

[0036] It should be noted that according to Pascal's law of liquid pressure, the pressure applied to any part of a closed liquid must be transmitted in all directions by the liquid according to its original magnitude.

[0037] There is pressure in all directions inside the liquid, and the pressure increases with the depth of the liquid. For the same liquid at the same depth, the pressure in all directions is equal. For different liquids at the same depth, the pressure generated is related to the density of the liquid. The greater the density, the greater the pressure of the liquid.

[0038] In other words, the pressure applied to a closed liquid can be transmitted in all directions by the liquid without changing its magnitude. Further analysis shows that the pressure of the liquid is related to the depth and density of the liquid, and has nothing to do with the mass of the liquid.

[0039] Based on the correspondence between liquid pressure and height, according to the formula: P = ρ × g × H, where P represents pressure, ρ represents liquid density, g represents gravitational acceleration, and h represents liquid height, it can be determined that by measuring the pressure from the top of the liquid level inside the transformer 100 to the provided sensor, combined with the density of the transformer 100 oil, the distance from the top of the transformer 100 to the sensor can be accurately calculated, and thus the liquid level of the transformer 100 can be calculated. In other words, the oil level of the transformer 100 oil conservator can be accurately calculated by detecting the magnitude of the pressure received by the pressure detection module 1.

[0040] like Figure 2 As shown, in some embodiments, the pressure detection module 1 includes: a first pressure sensor 11 and a second pressure sensor 12. The detection end of the first pressure sensor 11 is disposed at the bottom of the oil pillow, and the first pressure sensor 11 is used to detect a first pressure at the bottom of the oil pillow. The detection end of the second pressure sensor 12 is disposed at the bottom of the oil pillow, and the second pressure sensor 12 is used to detect a second pressure at the bottom of the oil pillow. The signal input end of the monitoring module 2 is connected to the signal output end of the first pressure sensor 11 and the signal output end of the second pressure sensor 12, respectively, and the monitoring module 2 is used to obtain the oil pressure at the bottom of the oil pillow based on the first pressure and the second pressure.

[0041] It can be understood that since the detection end of the first pressure sensor 11 is set at the bottom of the oil pillow, and the detection end of the second pressure sensor 12 is set at the bottom of the oil pillow, the signal input end of the monitoring module 2 is respectively connected to the signal output end of the first pressure sensor 11 and the signal output end of the second pressure sensor 12, so that the monitoring module 2 can use the first pressure sensor 11 to obtain the first pressure at the bottom of the oil pillow, and use the second pressure sensor 12 to obtain the second pressure at the bottom of the oil pillow, and then obtain the oil pressure at the bottom of the oil pillow based on the first pressure and the second pressure, thereby realizing the oil level monitoring of the transformer 100 oil pillow, and effectively improving the accuracy of the oil level monitoring of the oil pillow by using the redundant design of the first pressure sensor 11 and the second pressure sensor 12.

[0042] It should be noted that the first pressure sensor 11 and the second pressure sensor 12 are respectively used to detect the pressure at the bottom of the oil pillow, so that they are redundant with each other and correct each other at the same time. The specific types of the first pressure sensor 11 and the second pressure sensor 12 can be set according to actual needs and there is no restriction on this.

[0043] In some embodiments, the monitoring module 2 is used to use the average pressure of the first pressure and the second pressure as the oil pressure at the bottom of the oil pillow when the difference between the first pressure and the second pressure does not exceed the first preset value, and to control the alarm module 3 to issue a second alarm message when the difference between the first pressure and the second pressure exceeds the first preset value.

[0044] It can be understood that when the difference between the first pressure and the second pressure does not exceed the first preset value, it means that the first pressure detected by the first pressure sensor 11 and the second pressure detected by the second pressure sensor 12 are close, and both are in a normal detection state. Therefore, the monitoring module 2 uses the average pressure of the first pressure and the second pressure as the oil pressure at the bottom of the oil pillow, thereby ensuring a higher oil level monitoring accuracy of the transformer 100 oil pillow; when the difference between the first pressure and the second pressure exceeds the first preset value, it means that the gap between the first pressure detected by the first pressure sensor 11 and the second pressure detected by the second pressure sensor 12 is large, and there is an abnormality in the first pressure sensor 11 and / or the second pressure sensor 12. Therefore, the monitoring module 2 controls the alarm module 3 to issue a second alarm message, thereby prompting the operating personnel to handle it in time.

[0045] It should be noted that the second alarm information is different from the first alarm information, for example, the light flashing frequency, color, brightness, sound, etc. are different, and there is no limitation on this.

[0046] In some embodiments, the monitoring module 2 is configured to control the alarm module 3 to issue a second alarm message when the difference between the first pressure and the second pressure exceeds a first preset value but does not exceed a second preset value, and to use the maximum of the first and second pressures as the oil pressure at the bottom of the conservator and control the alarm module 3 to issue a third alarm message when the difference between the first and second pressures exceeds a second preset value. The first preset value is less than the second preset value.

[0047] It can be understood that when the difference between the first pressure and the second pressure exceeds the first preset value and does not exceed the second preset value, it means that the difference between the first pressure detected by the first pressure sensor 11 and the second pressure detected by the second pressure sensor 12 is large, and there is an abnormality in the first pressure sensor 11 and / or the second pressure sensor 12. Therefore, the monitoring module 2 controls the alarm module 3 to issue a second alarm message, thereby promptly prompting the operator to handle it; when the difference between the first pressure and the second pressure exceeds the second preset value, it means that the difference between the first pressure detected by the first pressure sensor 11 and the second pressure detected by the second pressure sensor 12 is extremely large, and there is an abnormality in the first pressure sensor 11 or the second pressure sensor 12. Therefore, the monitoring module 2 uses the maximum value of the first pressure and the second pressure as the oil pressure at the bottom of the oil pillow, thereby ensuring that the system continuously monitors the oil level of the oil pillow, and controls the alarm module 3 to issue a third alarm message, thereby promptly prompting the operator to handle the abnormal pressure sensor.

[0048] It should be noted that the third alarm information is different from the second alarm information and the first alarm information, for example, the light flashing frequency, color, brightness, sound, etc. are different, and there is no limitation on this.

[0049] like Figure 2 As shown, in some embodiments, the system further includes a temperature detection module 4, wherein a detection terminal of the temperature detection module 4 is disposed within the oil conservator of the transformer 100, and the temperature detection module 4 is configured to detect the oil temperature within the conservator. The signal input terminal of the monitoring module 2 is connected to the signal output terminal of the temperature detection module 4, and the monitoring module 2 is configured to compensate for the oil level within the conservator based on the difference between the oil temperature within the conservator and a base temperature.

[0050] It can be understood that since the detection end of the temperature detection module 4 is arranged in the oil pillow of the transformer 100, and the signal input end of the monitoring module 2 is connected to the signal output end of the temperature detection module 4, the monitoring module 2 can use the temperature detection module 4 to obtain the oil temperature in the oil pillow, and the oil level in the oil pillow obtained by compensating the difference between the oil temperature in the oil pillow and the base temperature, thereby eliminating the influence of temperature on the oil level in the oil pillow, and ensuring that the system has a high monitoring accuracy for the oil level in the oil pillow.

[0051] It should be noted that the temperature detection module 4 is used to detect the oil temperature in the oil pillow. The specific type of the temperature detection module 4 can be set according to actual needs and is not limited to this. For example, the temperature detection module 4 can be a temperature sensor.

[0052] In some embodiments, the monitoring module 2 is used to record the oil level in the oil pillow along a preset timeline, and obtain the oil level change trend in the oil pillow based on the recorded multiple oil levels and the preset timeline, and predict the oil level change in the oil pillow based on the oil level change trend in the oil pillow.

[0053] It can be understood that the monitoring module 2 records the oil level in the oil pillow along the preset timeline, and obtains the oil level change trend in the oil pillow based on the recorded multiple oil levels and the preset timeline, and predicts the oil level change in the oil pillow based on the oil level change trend in the oil pillow, thereby facilitating the monitoring and analysis of the oil status in the oil pillow, thereby ensuring the safe and stable operation of the transformer 100.

[0054] It should be noted that an oil level change curve graph can be formed based on the recorded multiple oil levels and the preset timeline, and the oil level change trend in the oil pillow can be obtained based on the oil level change curve graph. The oil level in the oil pillow at a certain point in the future can be predicted based on the oil level change trend in the oil pillow, so as to better plan the maintenance cycle of the transformer 100 and ensure the safe and stable operation of the transformer 100.

[0055] like Figure 2 As shown, in some embodiments, the system further includes: a tee (not shown in the figure) and a chromatographic detection module 5, the first end of the tee is connected to the bottom of the oil pillow of the transformer 100, and the second end of the tee is connected to the detection end of the pressure detection module 1, the detection end of the chromatographic detection module 5 is connected to the third end of the tee, and the signal output end of the chromatographic detection module 5 is connected to the signal input end of the monitoring module 2, and the chromatographic detection module 5 is used to detect the oil chromatogram in the oil pillow.

[0056] It can be understood that since the first end of the tee is connected to the bottom of the oil pillow of the transformer 100, and the second end of the tee is connected to the detection end of the pressure detection module 1, the detection end of the pressure detection module 1 can be connected to the bottom of the oil pillow of the transformer 100 by using the tee, thereby ensuring stable detection of the oil pressure at the bottom of the oil pillow. At the same time, since the detection end of the chromatographic detection module 5 is connected to the third end of the tee, and the signal output end of the chromatographic detection module 5 is connected to the signal input end of the monitoring module 2, the detection end of the chromatographic detection module 5 can be connected to the bottom of the oil pillow of the transformer 100 by using the tee, thereby ensuring stable detection of the oil chromatography at the bottom of the oil pillow.

[0057] Therefore, through the setting of the three-way pipe, the channel reuse of the pressure detection module 1 and the chromatography detection module 5 at the bottom of the oil pillow is achieved, thereby improving the utilization rate of the bottom structure of the oil pillow and reducing costs while achieving multifunctional detection.

[0058] It should be noted that, usually, the chromatographic detection module 5 is arranged at the bottom of the oil pillow of the transformer 100. In this embodiment, the original channel at the bottom of the oil pillow can be modified using a three-way pipe to reuse the oil circuit of the chromatographic detection module 5, thereby realizing the low-cost arrangement of the pressure detection module 1.

[0059] The chromatographic detection module 5 is used to detect the oil chromatogram in the oil conservator. The specific type of the chromatographic detection module 5 can be set according to actual needs and is not limited to this.

[0060] Based on the first pressure sensor 11 and the second pressure sensor 12 , the second end of the three-way pipe can be set to two, corresponding to the two pressure sensors respectively, that is, a four-way pipe structure.

[0061] like Figure 2 As shown, in some embodiments, the monitoring module 2 includes: a signal amplifying unit 21, a filtering unit 22, an analog-to-digital conversion unit 23 and a control unit 24, the signal input end of the signal amplifying unit 21 is connected to the signal output end of the pressure detection module 1, and the signal amplifying unit 21 is used to amplify the pressure signal, the signal input end of the filtering unit 22 is connected to the signal output end of the signal amplifying unit 21, and the filtering unit 22 is used to filter the pressure signal, the signal input end of the analog-to-digital conversion unit 23 is connected to the signal output end of the filtering unit 22, and the analog-to-digital conversion unit 23 is used for analog-to-digital conversion of the pressure signal, the signal input end of the control unit 24 is connected to the signal output end of the analog-to-digital conversion unit 23, and the signal output end of the control unit 24 is connected to the signal input end of the alarm module 3, the control unit 24 is used to obtain the oil level in the oil pillow according to the oil pressure at the bottom of the oil pillow and based on the corresponding model of pressure and oil level, and control the alarm module 3 to issue a first alarm message when the oil level in the oil pillow exceeds a preset oil level range.

[0062] It can be understood that the pressure signal detected by the pressure detection module 1 enters the control unit 24 after signal amplification by the signal amplification unit 21, filtering by the filtering unit 22, and analog-to-digital conversion by the analog-to-digital conversion unit 23, so that the control unit 24 can obtain the oil level in the oil pillow according to the oil pressure at the bottom of the oil pillow, thereby realizing accurate monitoring of the oil level.

[0063] It should be noted that the signal amplification unit 21 is used to amplify the pressure signal, the filtering unit 22 is used to filter the pressure signal, and the analog-to-digital conversion unit 23 is used to convert the pressure signal into analog-to-digital form. The specific types of the signal amplification unit 21, filtering unit 22, and analog-to-digital conversion unit 23 can be set according to actual needs and are not limited thereto. The signal amplification unit 21, filtering unit 22, and analog-to-digital conversion unit 23 can be integrated chips or functional circuits.

[0064] like Figure 2 As shown, in some embodiments, the monitoring module 2 further includes: a protocol converter 25 , a signal input end of the protocol converter 25 is connected to a signal output end of the control unit 24 , and the protocol converter 25 is used to control data upload of the control unit 24 .

[0065] It is understandable that since the signal input end of the protocol converter 25 is connected to the signal output end of the control unit 24, the control unit 24 can use the protocol converter 25 to upload data, thereby facilitating centralized monitoring of the oil level of the transformer 100 conservator.

[0066] It should be noted that the protocol converter 25 is used to control data upload of the control unit 24. The specific type of the protocol converter 25 can be set according to actual needs and is not limited to this. For example, the protocol converter 25 can use IEC61850 or RS-485 protocol communication.

[0067] In the description of the present disclosure, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance. In addition, in the description of the present disclosure, unless otherwise specified, the meaning of "plurality" is two or more.

[0068] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present disclosure includes additional implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present disclosure belong.

[0069] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0070] Although the embodiments of the present disclosure have been shown and described above, it is understood that the above embodiments are illustrative and are not to be construed as limitations on the present disclosure. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present disclosure.

Claims

1. A transformer conservator oil level monitoring system, characterized in that: include: A pressure detection module, wherein the detection end of the pressure detection module is arranged at the bottom of the oil pillow of the transformer, and the pressure detection module is used to detect the oil pressure at the bottom of the oil pillow; a monitoring module, wherein a signal input terminal of the monitoring module is connected to a signal output terminal of the pressure detection module, and the monitoring module is used to obtain the oil level in the oil conservator according to the oil pressure at the bottom of the conservator and based on a corresponding model of pressure and oil level; An alarm module, wherein the signal input end of the alarm module is connected to the signal output end of the monitoring module, and the alarm module is used to issue a first alarm message when the oil level in the oil pillow exceeds a preset oil level range.

2. The transformer conservator oil level monitoring system according to claim 1, characterized in that: The corresponding model of pressure and oil level includes the following formula: Wherein, H is the oil level in the oil pillow, P is the oil pressure at the bottom of the oil pillow, ρ is the density of the oil, and g is the acceleration due to gravity.

3. The transformer conservator oil level monitoring system according to claim 1, characterized in that: The pressure detection module includes: a first pressure sensor, wherein a detection end of the first pressure sensor is disposed at the bottom of the oil pillow, and the first pressure sensor is used to detect a first pressure at the bottom of the oil pillow; a second pressure sensor, wherein a detection end of the second pressure sensor is disposed at the bottom of the oil pillow, and the second pressure sensor is used to detect a second pressure at the bottom of the oil pillow; Among them, the signal input end of the monitoring module is connected to the signal output end of the first pressure sensor and the signal output end of the second pressure sensor respectively, and the monitoring module is used to obtain the oil pressure at the bottom of the oil pillow according to the first pressure and the second pressure.

4. The transformer conservator oil level monitoring system according to claim 3, characterized in that: The monitoring module is used to use the average pressure of the first pressure and the second pressure as the oil pressure at the bottom of the oil pillow when the difference between the first pressure and the second pressure does not exceed a first preset value, and to control the alarm module to issue a second alarm message when the difference between the first pressure and the second pressure exceeds a first preset value.

5. The transformer conservator oil level monitoring system according to claim 4, characterized in that: The monitoring module is configured to control the alarm module to issue a second alarm message when the difference between the first pressure and the second pressure exceeds a first preset value but does not exceed a second preset value, and to use the maximum value of the first pressure and the second pressure as the oil pressure at the bottom of the oil pillow and control the alarm module to issue a third alarm message when the difference between the first pressure and the second pressure exceeds a second preset value; The first preset value is smaller than the second preset value.

6. The transformer conservator oil level monitoring system according to claim 1, characterized in that: The system further comprises: A temperature detection module, wherein a detection end of the temperature detection module is disposed in the oil conservator of the transformer, and the temperature detection module is used to detect the temperature of the oil in the oil conservator; The signal input end of the monitoring module is connected to the signal output end of the temperature detection module, and the monitoring module is used to compensate for the oil level in the oil pillow according to the difference between the oil temperature in the oil pillow and the base temperature.

7. The transformer conservator oil level monitoring system according to claim 1, characterized in that: The monitoring module is used to record the oil level in the oil pillow along a preset timeline, and obtain the oil level change trend in the oil pillow based on the recorded multiple oil levels and the preset timeline, and predict the oil level change in the oil pillow based on the oil level change trend in the oil pillow.

8. The transformer conservator oil level monitoring system according to claim 1, characterized in that: The system further comprises: a tee pipe, wherein a first end of the tee pipe is connected to the bottom of the oil conservator of the transformer, and a second end of the tee pipe is connected to the detection end of the pressure detection module; A chromatographic detection module, wherein the detection end of the chromatographic detection module is connected to the third end of the tee tube, and the signal output end of the chromatographic detection module is connected to the signal input end of the monitoring module, and the chromatographic detection module is used to detect the oil chromatogram in the oil pillow.

9. The transformer conservator oil level monitoring system according to claim 1, characterized in that: The monitoring module includes: a signal amplifying unit, wherein a signal input end of the signal amplifying unit is connected to a signal output end of the pressure detection module, and the signal amplifying unit is used to amplify the pressure signal; a filter unit, wherein a signal input end of the filter unit is connected to a signal output end of the signal amplifying unit, and the filter unit is used for filtering the pressure signal; an analog-to-digital conversion unit, wherein a signal input end of the analog-to-digital conversion unit is connected to a signal output end of the filtering unit, and the analog-to-digital conversion unit is used for analog-to-digital conversion of the pressure signal; A control unit, wherein the signal input end of the control unit is connected to the signal output end of the analog-to-digital conversion unit, and the signal output end of the control unit is connected to the signal input end of the alarm module, the control unit is used to obtain the oil level in the oil pillow according to the oil pressure at the bottom of the oil pillow and based on a corresponding model of pressure and oil level, and to control the alarm module to issue a first alarm message when the oil level in the oil pillow exceeds a preset oil level range.

10. The transformer conservator oil level monitoring system according to claim 9, characterized in that: The monitoring module also includes: A protocol converter, wherein the signal input end of the protocol converter is connected to the signal output end of the control unit, and the protocol converter is used for uploading data from the control unit.

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