Mutual inductor oil level monitoring method, device and equipment

Abstract

The invention discloses a mutual inductor oil level monitoring method, device and equipment, and belongs to the technical field of power equipment monitoring. The mutual inductor oil level monitoring method is applied to mutual inductor oil level monitoring equipment and comprises the steps that a first capacitance value of a first detection capacitor and a second capacitance value of a second detection capacitor are obtained, first oil level information is determined according to the first capacitance value, and second oil level information is determined according to the second capacitance value; when the first oil level information represents that the oil level of the insulating oil in the mutual inductor is higher than an oil level upper limit threshold value, or the second oil level information represents that the oil level of the insulating oil in the mutual inductor is lower than an oil level lower limit threshold value, it is confirmed that the mutual inductor breaks down. 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, so that related fault processing is carried out, and the operation safety of a transformer substation is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power equipment monitoring, and in particular to a method, a device and equipment for monitoring the oil level of a transformer. 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 fail to be 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 method, device and equipment 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 method, which is applied to a transformer oil level monitoring device, wherein the transformer oil level monitoring device includes a first detection capacitor and a second detection capacitor, wherein the first detection capacitor is set corresponding to an upper limit threshold position of the oil level of the insulating oil in the transformer, and the second detection capacitor is set corresponding to a lower limit threshold position of the oil level of the insulating oil in the transformer;

[0005] The transformer oil level monitoring method comprises:

[0006] Acquire a first capacitance value of the first detection capacitor and a second capacitance value of the second detection capacitor, determine first oil level information according to the first capacitance value, and determine second oil level information according to the second capacitance value;

[0007] When the first oil level information indicates that the oil level of the insulating oil in the transformer is higher than the upper oil level threshold, or the second oil level information indicates that the oil level of the insulating oil in the transformer is lower than the lower oil level threshold, it is confirmed that the transformer has a fault.

[0008] Optionally, the transformer oil level monitoring device further comprises: a temperature sensor, arranged on the outer wall of the transformer;

[0009] Before obtaining the first capacitance value of the first detection capacitor and the second capacitance value of the second detection capacitor, the method further includes:

[0010] Obtaining the current transformer temperature collected by the transformer temperature sensor;

[0011] Determining first oil level information according to the first capacitance value includes:

[0012] Obtaining a first corresponding relationship at the current transformer temperature; the first corresponding relationship is a corresponding relationship between the capacitance value of the first detection capacitor and the oil level of the insulating oil in the transformer;

[0013] determining the first oil level information according to a first corresponding relationship between the first capacitance value and the current transformer temperature;

[0014] Determining second oil level information according to the second capacitance value includes:

[0015] Obtaining a second corresponding relationship at the current transformer temperature; the second corresponding relationship is a corresponding relationship between the capacitance value of the second detection capacitor and the oil level of the insulating oil in the transformer;

[0016] The second oil level information is determined according to a second corresponding relationship between the second capacitance value and the current transformer temperature.

[0017] Optionally, the first corresponding relationship includes: when the oil level of the insulating oil in the transformer is below the oil level upper limit threshold, the first capacitance range of the first detection capacitor; the first capacitance range is different at different transformer temperatures;

[0018] Determining the first oil level information according to a first corresponding relationship between the first capacitance value and the current transformer temperature includes:

[0019] If the first capacitance value is within the first capacitance range at the current transformer temperature, the first oil level information indicates that the oil level of the insulating oil in the transformer does not exceed the oil level upper limit threshold;

[0020] If the first capacitance value is outside the first capacitance range at the current transformer temperature, the first oil level information indicates that the oil level of the insulating oil in the transformer is higher than the oil level upper limit threshold;

[0021] The second corresponding relationship includes: when the oil level of the insulating oil in the transformer is above the lower limit threshold of the oil level, the second capacitance range of the second detection capacitor; the second capacitance range is different at different transformer temperatures;

[0022] Determining the second oil level information according to a second corresponding relationship between the second capacitance value and the current transformer temperature includes:

[0023] If the second capacitance value is within the second capacitance range under the current transformer temperature, the second oil level information indicates that the oil level of the insulating oil in the transformer has reached the oil level lower limit threshold;

[0024] If the second capacitance value is outside the second capacitance range at the current transformer temperature, the second oil level information indicates that the oil level of the insulating oil in the transformer is lower than the oil level lower limit threshold.

[0025] Optionally, the first corresponding relationship includes: the oil levels corresponding to different capacitance values ​​of the first detection capacitor; and different oil levels corresponding to the first detection capacitor having the same capacitance value at different transformer temperatures;

[0026] Determining the first oil level information according to a first corresponding relationship between the first capacitance value and the current transformer temperature includes:

[0027] Determining a current first oil level according to a first corresponding relationship between the first capacitance value and the current transformer temperature;

[0028] Determining the first oil level information according to a height relationship between the current first oil level and the oil level upper limit threshold;

[0029] The second corresponding relationship includes: the oil level corresponding to different capacitance values ​​of the second detection capacitor; and the oil level corresponding to different second detection capacitors having the same capacitance value at different transformer temperatures;

[0030] Determining the second oil level information according to a second corresponding relationship between the second capacitance value and the current transformer temperature includes:

[0031] determining a current second oil level according to a second corresponding relationship between the second capacitance value and the current transformer temperature;

[0032] The second oil level information is determined according to the height relationship between the current second oil level and the oil level lower limit threshold.

[0033] Optionally, the process of establishing the first corresponding relationship at any transformer temperature includes:

[0034] At the transformer temperature, the oil level of the insulating oil in the transformer is adjusted multiple times, and the oil level in each adjustment and the corresponding capacitance value of the first detection capacitor are recorded; wherein the oil level is controlled to be within the oil level upper threshold in at least one adjustment, and the oil level is controlled to be lower than the oil level upper threshold in at least one adjustment;

[0035] Determining a first corresponding relationship under the transformer temperature according to the oil level in each adjustment and the corresponding capacitance value of the first detection capacitor;

[0036] The process of establishing the second corresponding relationship at any transformer temperature includes:

[0037] At the transformer temperature, the oil level of the insulating oil in the transformer is adjusted multiple times, and the oil level in each adjustment and the corresponding capacitance value of the second detection capacitor are recorded; wherein the oil level is controlled to be within the oil level lower limit threshold in at least one adjustment, and the oil level is controlled to be higher than the oil level lower limit threshold in at least one adjustment;

[0038] A second corresponding relationship under the transformer temperature is determined according to the oil level in each adjustment and the corresponding capacitance value of the second detection capacitor.

[0039] Optionally, the transformer oil level monitoring device further includes: an alarm module;

[0040] After confirming that the transformer fails, the method further includes:

[0041] Send an alarm instruction to the alarm module to control the alarm module to issue a fault alarm.

[0042] In a second aspect, an embodiment of the present invention further provides a transformer oil level monitoring device, comprising:

[0043] an information acquisition module, used to acquire a first capacitance value of the first detection capacitor and a second capacitance value of the second detection capacitor, determine first oil level information according to the first capacitance value, and determine second oil level information according to the second capacitance value;

[0044] A fault judgment module is used to confirm that the transformer has a fault when the first oil level information indicates that the oil level of the insulating oil in the transformer is higher than an upper oil level threshold, or when the second oil level information indicates that the oil level of the insulating oil in the transformer is lower than a lower oil level threshold.

[0045] In a third aspect, an embodiment of the present invention further provides a transformer oil level monitoring device, comprising:

[0046] A first detection capacitor is set corresponding to an upper threshold position of the oil level of the insulating oil in the transformer;

[0047] A second detection capacitor is set corresponding to the lower limit threshold position of the oil level of the insulating oil in the transformer;

[0048] The controller is connected to the first detection capacitor and the second detection capacitor respectively, and is used to execute the transformer oil level monitoring method provided by any embodiment of the present invention.

[0049] In the transformer oil level monitoring method provided in the embodiment of the present invention, the principle that the rise and fall of the oil level will change the capacitance value of the detection capacitor is used. By monitoring the capacitance values ​​of the two detection capacitors to monitor the oil level of the insulating oil in the transformer, it is possible to timely discover the transformer's oil level that is too high due to heat, and the oil level that is too low due to oil seepage and leakage during operation and maintenance work, thereby avoiding heating or insulation accidents caused by too high or too low oil levels, improving the level of substation equipment operation and maintenance, and improving the operational safety of the substation. In addition, oil level monitoring can be achieved by installing a detection capacitor on the outer wall of the transformer. Compared with installing a light / displacement sensor inside the transformer or using visual processing to detect the oil level, the embodiment of the present invention does not need to modify the structure of the transformer, does not destroy the original structural strength of the transformer, and the data processing process is simple, which can avoid detection errors caused by complex calculation processes.

[0050] 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

[0051] 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.

[0052] Figure 1 It is a structural schematic diagram of a transformer oil level monitoring device provided by an embodiment of the present invention;

[0053] Figure 2 1 is a flow chart of a method for monitoring oil level of a transformer provided by an embodiment of the present invention;

[0054] Figure 3 It is a structural schematic diagram of a transformer oil level monitoring device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0055] 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.

[0056] 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.

[0057] The embodiment of the present invention provides a transformer oil level monitoring method, which is applied to a transformer oil level monitoring device, and uses a detection capacitor arranged on the outer wall of the transformer to detect the oil level of the insulating oil in the transformer, so as to detect oil level abnormalities in time. Figure 1 , the structure of the transformer oil level monitoring equipment is briefly described.

[0058] See also Figure 1 , the transformer oil level monitoring device includes a first detection capacitor 210 and a second detection capacitor 220, and the first detection capacitor 210 and the second detection capacitor 220 are arranged at different heights on the outer wall of the transformer 100. The first detection capacitor 210 is arranged corresponding to the upper limit threshold value LH of the oil level of the insulating oil in the transformer 100, and whether the oil level is higher than the upper limit threshold value LH of the oil level can be determined according to the capacitance value of the first detection capacitor 210; the second detection capacitor 220 is arranged corresponding to the lower limit threshold value LL of the oil level of the insulating oil in the transformer 100, and whether the oil level is lower than the lower limit threshold value LL of the oil level can be determined according to the capacitance value of the second detection capacitor 220. Specifically, the first detection capacitor 210 includes a first positive patch electrode 11 and a first negative patch electrode 12, 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, and the setting position of the first negative patch electrode 12 on the outer wall of the transformer 100 is lower than the upper limit threshold value LH of the oil level. The second detection capacitor 220 includes a second positive patch electrode 21 and a second negative patch electrode 22. The second positive patch electrode 21 is disposed on the outer wall of the transformer 100 at a position higher than the lower limit threshold value LL of the oil level and lower than the first negative patch electrode 12 is disposed on the outer wall of the transformer 100. The second negative patch electrode 22 is disposed on the outer wall of the transformer 100 at a position lower than the lower limit threshold value LL of the oil level. In addition, the transformer oil level monitoring device may also include a controller 300, the controller 300 is respectively connected to the first detection capacitor 210 and the second detection capacitor 220, and the transformer oil level monitoring method may be executed by the controller 300. Exemplarily, the transformer 100 is, for example, an oil-immersed transformer, the upper limit threshold value LH of the oil level and the lower limit threshold value LL of the oil level are, for example, scale marks on the observation window of the metal expander at the top of the immersed transformer, and the first detection capacitor 210 and the second detection capacitor 220 may both be disposed on the outer wall of the observation window.

[0059] For any detection capacitor: when the oil level of the insulating oil in the mutual inductor 100 is higher than the setting position of its positive patch electrode, the medium between the positive and negative patch electrodes of the detection capacitor includes the outer wall of the mutual inductor 100 (such as the outer wall of the observation window) and the insulating oil; when the oil level of the insulating oil in the mutual inductor 100 is between the setting positions of its positive and negative patch electrodes, the medium between the positive and negative patch electrodes of the detection capacitor includes the outer wall of the mutual inductor 100, air and insulating oil, and the ratio of air to insulating oil in the medium is different when the oil level is high or low; the change of the medium between the positive and negative patch electrodes of the detection capacitor will cause the capacitance value 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 value of the detection capacitor. Among them, the capacitance value of the first detection capacitor 210 corresponds to the oil level near the upper limit threshold value LH of the oil level, and the capacitance value of the second detection capacitor 220 corresponds to the oil level near the lower limit threshold value LL of the oil level.

[0060] Based on the above principles, see Figure 2 , the transformer oil level monitoring method comprises the following steps:

[0061] S110, obtaining a first capacitance value of the first detection capacitor and a second capacitance value of the second detection capacitor, determining first oil level information according to the first capacitance value, and determining second oil level information according to the second capacitance value.

[0062] The controller 30 may determine the first capacitance value of the first detection capacitor 210 according to the signal transmitted on the first positive patch electrode 11 and the first negative patch electrode 12, and determine the second capacitance value of the second detection capacitor 220 according to the signal transmitted on the second positive patch electrode 21 and the second negative patch electrode 22. The controller 30 may, for example, use a timer to measure the charging time of the capacitor to obtain the capacitance value of the capacitor, or use a resonance method to measure the capacitance value of the capacitor, or use any existing method to measure the capacitance values ​​of the two detection capacitors, and the specific measurement method is not limited here.

[0063] The first oil level information is the oil level information near the oil level upper limit threshold LH, which is used to characterize the high and low relationship between the current oil level and the oil level upper limit threshold LH; the second oil level information is the oil level information near the oil level lower limit threshold LL, which is used to characterize the high and low relationship between the current oil level and the oil level lower limit threshold LL.

[0064] S120: When the first oil level information indicates that the oil level of the insulating oil in the transformer is higher than the upper oil level threshold, or when the second oil level information indicates that the oil level of the insulating oil in the transformer is lower than the lower oil level threshold, confirm that the transformer is faulty.

[0065] Among them, the oil level upper limit threshold LH is the upper limit value of the safety range of the insulating oil level in the transformer, and the oil level lower limit threshold LL is the lower limit value 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 limit 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 limit threshold LL, it indicates that there are problems such as oil seepage or oil leakage in the transformer 100, which may easily cause insulation faults; if the oil level is detected to be between the oil level lower limit threshold LL and the oil level upper limit threshold LH, it indicates that the oil level is within the safe range, the transformer 100 has no faults, and is operating normally.

[0066] Exemplarily, the controller 300 can continuously detect the capacitance values ​​of the two detection capacitors at a certain frequency, and obtain the oil level information according to the capacitance value analysis to achieve continuous tracking and monitoring of oil level changes, thereby timely discovering oil level abnormalities and related faults of the transformer 100.

[0067] In the transformer oil level monitoring method provided in the embodiment of the present invention, the principle that the rise and fall of the oil level will change the capacitance value of the detection capacitor is used. By monitoring the capacitance values ​​of the two detection capacitors to monitor the oil level of the insulating oil in the transformer, it is possible to timely discover the transformer's oil level that is too high due to heat, and the oil level that is too low due to oil seepage and leakage during operation and maintenance work, thereby avoiding heating or insulation accidents caused by too high or too low oil levels, improving the level of substation equipment operation and maintenance, and improving the operational safety of the substation. In addition, oil level monitoring can be achieved by installing a detection capacitor on the outer wall of the transformer. Compared with installing a light / displacement sensor inside the transformer or using visual processing to detect the oil level, the embodiment of the present invention does not need to modify the structure of the transformer, does not destroy the original structural strength of the transformer, and the data processing process is simple, which can avoid detection errors caused by complex calculation processes.

[0068] On the basis of the above-mentioned embodiments, the transformer oil level monitoring device may also include: a temperature sensor, which is arranged on the outer wall of the transformer and is used to detect the transformer temperature in real time. The temperature sensor can also be connected to the controller to transmit the collected transformer temperature to the controller. Among them, since the transformers in the substation are usually arranged outdoors, the ambient temperature of the transformer varies greatly in different time periods; and the transformer itself has a certain heating phenomenon during operation, which will also affect the temperature of the transformer. The temperature has a certain influence on the capacitance value of the detection capacitor. Under different temperature conditions, the same detection capacitor may have different capacitance values ​​when corresponding to the same oil level. Therefore, by obtaining the transformer temperature information, the corresponding relationship between the capacitance value and the oil level can be corrected to obtain more accurate oil level information.

[0069] Specifically, before obtaining the first capacitance value of the first detection capacitor and the second capacitance value of the second detection capacitor, the method further includes: obtaining a current transformer temperature collected by a transformer temperature sensor.

[0070] Correspondingly, determining the first oil level information according to the first capacitance value includes: obtaining the first corresponding relationship under the current transformer temperature; the first corresponding relationship is the corresponding relationship between the capacitance value of the first detection capacitor and the oil level of the insulating oil in the transformer; determining the first oil level information according to the first corresponding relationship between the first capacitance value and the current transformer temperature.

[0071] Determining the second oil level information according to the second capacitance value includes: obtaining a second corresponding relationship under the current transformer temperature; the second corresponding relationship is the corresponding relationship between the capacitance value of the second detection capacitor and the oil level of the insulating oil in the transformer; determining the second oil level information according to the second corresponding relationship between the second capacitance value and the current transformer temperature.

[0072] Among them, there are differences in the first corresponding relationship under different transformer temperatures, and there are differences in the second corresponding relationship under different transformer temperatures. This embodiment monitors the oil level by detecting the transformer temperature and determining the first corresponding relationship and the second corresponding relationship according to the transformer temperature, which can effectively improve the accuracy of each oil level detection result and avoid false alarms of abnormal oil level as much as possible.

[0073] On the basis of the above-mentioned implementation modes, optionally, there are multiple specific types of the first corresponding relationship and the second corresponding relationship, several of which are described below, but are not intended to limit the present invention.

[0074] In one embodiment, optionally, the first corresponding relationship includes: when the oil level of the insulating oil in the transformer is below the upper oil level threshold, the first capacitance range of the first detection capacitor is different at different transformer temperatures.

[0075] Then, according to the first corresponding relationship between the first capacitance value and the current transformer temperature, the first oil level information is determined, including: if the first capacitance value is within the first capacitance range at the current transformer temperature, the first oil level information indicates that the oil level of the insulating oil in the transformer does not exceed the oil level upper limit threshold; if the first capacitance value is outside the first capacitance range at the current transformer temperature, the first oil level information indicates that the oil level of the insulating oil in the transformer is higher than the oil level upper limit threshold.

[0076] Specifically, when the oil level of the insulating oil in the transformer is the upper oil level threshold, the capacitance value of the first detection capacitor is recorded as the first critical capacitance value, and the first capacitance range is less than or equal to the first critical capacitance value; the first critical capacitance value at different transformer temperatures is different. Then, at the current transformer temperature, once it is detected that the current first capacitance value is higher than the first critical capacitance value at the current transformer temperature, it indicates that the current first capacitance value is outside the first capacitance range at the current transformer temperature, and the first oil level information can be adjusted to information indicating that the oil level of the insulating oil in the transformer is higher than the upper oil level threshold.

[0077] The second corresponding relationship includes: when the oil level of the insulating oil in the transformer is above the lower oil level threshold, the second capacitance range of the second detection capacitor is different at different transformer temperatures.

[0078] Then, according to the second corresponding relationship between the second capacitance value and the current transformer temperature, the second oil level information is determined, including: if the second capacitance value is within the second capacitance range at the current transformer temperature, the second oil level information indicates that the oil level of the insulating oil in the transformer has reached the lower limit threshold of the oil level; if the second capacitance value is outside the second capacitance range at the current transformer temperature, the second oil level information indicates that the oil level of the insulating oil in the transformer is lower than the lower limit threshold of the oil level.

[0079] Specifically, when the oil level of the insulating oil in the transformer is the lower limit threshold of the oil level, the capacitance value of the second detection capacitor is recorded as the second critical capacitance value, and the second capacitance range is greater than or equal to the second critical capacitance value; the second critical capacitance value at different transformer temperatures is different. Then, at the current transformer temperature, once it is detected that the current second capacitance value is lower than the second critical capacitance value at the current transformer temperature, it indicates that the current second capacitance value is outside the second capacitance range at the current transformer temperature, and the second oil level information can be adjusted to information indicating that the oil level of the insulating oil in the transformer is lower than the lower limit threshold of the oil level.

[0080] In another embodiment, optionally, the first corresponding relationship includes: oil levels corresponding to different capacitance values ​​of the first detection capacitor, wherein at different transformer temperatures, the first detection capacitor has different corresponding oil levels when having the same capacitance value.

[0081] Then, according to the first corresponding relationship between the first capacitance value and the current transformer temperature, the first oil level information is determined, including: according to the first corresponding relationship between the first capacitance value and the current transformer temperature, the current first oil level is determined; according to the high and low relationship between the current first oil level and the oil level upper limit threshold, the first oil level information is determined.

[0082] Specifically, if the current first oil level is higher than the oil level upper limit threshold, the first oil level information is adjusted to information indicating that the oil level of the insulating oil in the transformer is higher than the oil level upper limit threshold; if the current first oil level is lower than or equal to the oil level upper limit threshold, the first oil level information is adjusted to information indicating that the oil level of the insulating oil in the transformer does not exceed the oil level upper limit threshold.

[0083] The second corresponding relationship includes: oil levels corresponding to different capacitance values ​​of the second detection capacitor, wherein at different transformer temperatures, the oil levels corresponding to the second detection capacitors with the same capacitance value are different.

[0084] Then, according to the second corresponding relationship between the second capacitance value and the current transformer temperature, the second oil level information is determined, including: according to the second corresponding relationship between the second capacitance value and the current transformer temperature, the current second oil level is determined; according to the high and low relationship between the current second oil level and the oil level lower limit threshold, the second oil level information is determined.

[0085] Specifically, if the current second oil level is lower than the oil level lower limit threshold, the second oil level information is adjusted to information characterizing that the oil level of the insulating oil in the transformer is lower than the oil level lower limit threshold; if the current second oil level is higher than or equal to the oil level upper limit threshold, the second oil level information is adjusted to information characterizing that the oil level of the insulating oil in the transformer reaches the oil level lower limit threshold.

[0086] Based on the above embodiments, optionally, the first correspondence and the second correspondence under each transformer temperature can be acquired in advance and stored in the controller, so that in the subsequent monitoring process, the controller can extract the corresponding first correspondence and the second correspondence from the stored information according to the transformer temperature.

[0087] The process of establishing the first corresponding relationship at any transformer temperature includes: controlling the transformer temperature to maintain at the transformer temperature, and on this basis, adjusting the oil level of the insulating oil in the transformer for multiple times, and recording the oil level in each adjustment and the capacitance value of the corresponding first detection capacitor; determining the first corresponding relationship at the transformer temperature according to the oil level in each adjustment and the capacitance value of the corresponding first detection capacitor. Among them, the oil level of at least some adjustments is different. Specifically, the oil level is controlled to be at the upper limit threshold of the oil level in at least one adjustment to determine the first capacitance value corresponding to the upper limit threshold of the oil level; the oil level is controlled to be lower than the upper limit threshold of the oil level in at least one adjustment to determine the change trend of the first capacitance value near the upper limit threshold of the oil level; illustratively, the oil level can also be controlled to be higher than the upper limit threshold of the oil level in at least one adjustment. According to the oil level in each adjustment and the capacitance value of the corresponding first detection capacitor, the first corresponding relationship of the required type in any of the above embodiments can be determined.

[0088] The process of establishing the second corresponding relationship at any transformer temperature includes: adjusting the oil level of the insulating oil in the transformer for multiple times at the transformer temperature, and recording the oil level in each adjustment and the capacitance value of the corresponding second detection capacitor; determining the second corresponding relationship at the transformer temperature according to the oil level in each adjustment and the capacitance value of the corresponding second detection capacitor. Among them, the oil level of at least some adjustments is different. Specifically, the oil level is controlled to be at the lower limit threshold of the oil level in at least one adjustment to determine the second capacitance value corresponding to the lower limit threshold of the oil level; the oil level is controlled to be higher than the lower limit threshold of the oil level in at least one adjustment; to determine the change trend of the second capacitance value near the lower limit threshold of the oil level; illustratively, the oil level can also be controlled to be lower than the lower limit threshold of the oil level in at least one adjustment. According to the oil level in each adjustment and the capacitance value of the corresponding second detection capacitor, the second corresponding relationship of the required type in any of the above embodiments can be determined.

[0089] On the basis of the above embodiments, the transformer oil level monitoring device may optionally further include: an alarm module. In the transformer oil level monitoring method, after confirming that the transformer has a fault, it may further include: sending an alarm instruction to the alarm module to control the alarm module to issue a fault alarm. Exemplarily, the alarm module may issue a fault alarm in at least one of sound, light and vibration to prompt the operation and maintenance personnel to perform maintenance and fault handling as soon as possible.

[0090] An embodiment of the present invention further provides a transformer oil level monitoring device, which is used to execute the transformer oil level monitoring method provided by any embodiment of the present invention, and has corresponding beneficial effects. Figure 3 Schematic diagram of a transformer oil level monitoring device provided by an embodiment of the present invention. Figure 3 The transformer oil level monitoring device includes: an information acquisition module 110 and a fault judgment module 120.

[0091] The information acquisition module 110 is used to acquire the first capacitance value of the first detection capacitor and the second capacitance value of the second detection capacitor, determine the first oil level information according to the first capacitance value, and determine the second oil level information according to the second capacitance value. The fault judgment module 120 is used to confirm that the transformer has a fault when the first oil level information indicates that the oil level of the insulating oil in the transformer is higher than the upper oil level threshold, or when the second oil level information indicates that the oil level of the insulating oil in the transformer is lower than the lower oil level threshold.

[0092] Based on the above embodiments, optionally, the transformer oil level monitoring device further includes: a temperature acquisition module, which is used to obtain the current transformer temperature collected by the transformer temperature sensor before obtaining the first capacitance value of the first detection capacitor and the second capacitance value of the second detection capacitor.

[0093] Correspondingly, when acquiring the first oil level information, the information acquisition module 110 is specifically used to: acquire the first corresponding relationship at the current transformer temperature; the first corresponding relationship is the corresponding relationship between the capacitance value of the first detection capacitor and the oil level of the insulating oil in the transformer; the first oil level information is determined according to the first corresponding relationship between the first capacitance value and the current transformer temperature. When acquiring the second oil level information, the information acquisition module 110 is specifically used to: acquire the second corresponding relationship at the current transformer temperature; the second corresponding relationship is the corresponding relationship between the capacitance value of the second detection capacitor and the oil level of the insulating oil in the transformer; the second oil level information is determined according to the second corresponding relationship between the second capacitance value and the current transformer temperature.

[0094] On the basis of the above-mentioned embodiments, the transformer oil level monitoring device may optionally further include: an alarm instruction issuing module, which is used to issue an alarm instruction to the alarm module after confirming that the transformer has a fault, and control the alarm module to issue a fault alarm.

[0095] An embodiment of the present invention further provides a transformer oil level monitoring device, which can apply the transformer oil level monitoring method provided in any of the above embodiments to monitor the oil level of insulating oil in the transformer, and has corresponding beneficial effects.

[0096] See also Figure 1 , the transformer oil level monitoring device includes: a first detection capacitor 210, a second detection capacitor 220 and a controller 300. The first detection capacitor 210 corresponds to the upper limit threshold value LH of the oil level of the insulating oil in the transformer 100; the second detection capacitor 220 corresponds to the lower limit threshold value LL of the oil level of the insulating oil in the transformer 100; the controller 300 is connected to the first detection capacitor 210 and the second detection capacitor 220 respectively, and the controller 300 is used for the transformer oil level monitoring method provided by any embodiment of the present invention. Exemplarily, the controller 300 can be a single-chip microcomputer, and the transformer oil level monitoring device provided by any of the above embodiments can be integrated in the controller.

[0097] 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.

[0098] 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 method for monitoring the oil level of a transformer, characterized in that: Applied to a transformer oil level monitoring device, the transformer oil level monitoring device comprises a first detection capacitor and a second detection capacitor, the first detection capacitor is set corresponding to the upper limit threshold position of the oil level of the insulating oil in the transformer, and the second detection capacitor is set corresponding to the lower limit threshold position of the oil level of the insulating oil in the transformer; The transformer oil level monitoring method comprises: Acquire a first capacitance value of the first detection capacitor and a second capacitance value of the second detection capacitor, determine first oil level information according to the first capacitance value, and determine second oil level information according to the second capacitance value; When the first oil level information indicates that the oil level of the insulating oil in the transformer is higher than the upper oil level threshold, or the second oil level information indicates that the oil level of the insulating oil in the transformer is lower than the lower oil level threshold, it is confirmed that the transformer has a fault.

2. The transformer oil level monitoring method according to claim 1, characterized in that: The transformer oil level monitoring device further comprises: a temperature sensor, which is arranged on the outer wall of the transformer; Before obtaining the first capacitance value of the first detection capacitor and the second capacitance value of the second detection capacitor, the method further includes: Obtaining the current transformer temperature collected by the transformer temperature sensor; Determining first oil level information according to the first capacitance value includes: Obtaining a first corresponding relationship at the current transformer temperature; the first corresponding relationship is a corresponding relationship between the capacitance value of the first detection capacitor and the oil level of the insulating oil in the transformer; determining the first oil level information according to a first corresponding relationship between the first capacitance value and the current transformer temperature; Determining second oil level information according to the second capacitance value includes: Obtaining a second corresponding relationship at the current transformer temperature; the second corresponding relationship is a corresponding relationship between the capacitance value of the second detection capacitor and the oil level of the insulating oil in the transformer; The second oil level information is determined according to a second corresponding relationship between the second capacitance value and the current transformer temperature.

3. The transformer oil level monitoring method according to claim 2, characterized in that: The first corresponding relationship includes: when the oil level of the insulating oil in the transformer is below the oil level upper limit threshold, the first capacitance range of the first detection capacitor; the first capacitance range is different at different transformer temperatures; Determining the first oil level information according to a first corresponding relationship between the first capacitance value and the current transformer temperature includes: If the first capacitance value is within the first capacitance range at the current transformer temperature, the first oil level information indicates that the oil level of the insulating oil in the transformer does not exceed the oil level upper limit threshold; If the first capacitance value is outside the first capacitance range at the current transformer temperature, the first oil level information indicates that the oil level of the insulating oil in the transformer is higher than the oil level upper limit threshold; The second corresponding relationship includes: when the oil level of the insulating oil in the transformer is above the lower limit threshold of the oil level, the second capacitance range of the second detection capacitor; the second capacitance range is different at different transformer temperatures; Determining the second oil level information according to a second corresponding relationship between the second capacitance value and the current transformer temperature includes: If the second capacitance value is within the second capacitance range at the current transformer temperature, the second oil level information indicates that the oil level of the insulating oil in the transformer has reached the oil level lower limit threshold; If the second capacitance value is outside the second capacitance range at the current transformer temperature, the second oil level information indicates that the oil level of the insulating oil in the transformer is lower than the oil level lower limit threshold.

4. The transformer oil level monitoring method according to claim 2, characterized in that: The first corresponding relationship includes: the oil levels corresponding to different capacitance values ​​of the first detection capacitor; and different oil levels corresponding to the first detection capacitor having the same capacitance value at different transformer temperatures; Determining the first oil level information according to a first corresponding relationship between the first capacitance value and the current transformer temperature includes: Determining a current first oil level according to a first corresponding relationship between the first capacitance value and the current transformer temperature; Determining the first oil level information according to a height relationship between the current first oil level and the oil level upper limit threshold; The second corresponding relationship includes: the oil level corresponding to different capacitance values ​​of the second detection capacitor; and the oil level corresponding to different second detection capacitors having the same capacitance value at different transformer temperatures; Determining the second oil level information according to a second corresponding relationship between the second capacitance value and the current transformer temperature includes: determining a current second oil level according to a second corresponding relationship between the second capacitance value and the current transformer temperature; The second oil level information is determined according to the height relationship between the current second oil level and the oil level lower limit threshold.

5. The method for monitoring the oil level of a transformer according to any one of claims 2 to 4, characterized in that: The process of establishing the first corresponding relationship at any transformer temperature includes: At the transformer temperature, the oil level of the insulating oil in the transformer is adjusted multiple times, and the oil level in each adjustment and the corresponding capacitance value of the first detection capacitor are recorded; wherein the oil level is controlled to be within the oil level upper threshold in at least one adjustment, and the oil level is controlled to be lower than the oil level upper threshold in at least one adjustment; Determining a first corresponding relationship under the transformer temperature according to the oil level in each adjustment and the corresponding capacitance value of the first detection capacitor; The process of establishing the second corresponding relationship at any transformer temperature includes: At the transformer temperature, the oil level of the insulating oil in the transformer is adjusted multiple times, and the oil level in each adjustment and the corresponding capacitance value of the second detection capacitor are recorded; wherein the oil level is controlled to be within the oil level lower limit threshold in at least one adjustment, and the oil level is controlled to be higher than the oil level lower limit threshold in at least one adjustment; A second corresponding relationship under the transformer temperature is determined according to the oil level in each adjustment and the corresponding capacitance value of the second detection capacitor.

6. The method for monitoring the oil level of a transformer according to any one of claims 1 to 3, characterized in that: The transformer oil level monitoring device further includes: an alarm module; After confirming that the transformer fails, the method further includes: Send an alarm instruction to the alarm module to control the alarm module to issue a fault alarm.

7. A transformer oil level monitoring device, characterized in that: include: an information acquisition module, used to acquire a first capacitance value of the first detection capacitor and a second capacitance value of the second detection capacitor, determine first oil level information according to the first capacitance value, and determine second oil level information according to the second capacitance value; A fault judgment module is used to confirm that the transformer has a fault when the first oil level information indicates that the oil level of the insulating oil in the transformer is higher than an upper oil level threshold, or when the second oil level information indicates that the oil level of the insulating oil in the transformer is lower than a lower oil level threshold.

8. A transformer oil level monitoring device, characterized in that: include: A first detection capacitor is set corresponding to an upper threshold position of the oil level of the insulating oil in the transformer; A second detection capacitor is set corresponding to the lower limit threshold position of the oil level of the insulating oil in the transformer; A controller is connected to the first detection capacitor and the second detection capacitor respectively, and is used to execute the transformer oil level monitoring method according to any one of claims 1 to 6.

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