Transformer and liquid level detection method thereof

Abstract

The invention provides a transformer and a liquid level detection method thereof, and relates to the technical field of transformer monitoring. The two pressure sensors are respectively positioned at the bottom and the top of the liquid injection device, and liquid is injected into the liquid injection device, so that one pressure sensor can detect the pressure intensity of the liquid in the liquid injection device and the pressure intensity of the gas in the liquid injection device on the bottom of the liquid injection device, and the other pressure sensor can detect the air pressure of the gas in the liquid injection device. Therefore, the pressure intensity of the internal liquid on the bottom of the liquid injection device can be determined according to the detection results of the two pressure sensors, so that the height of the internal liquid can be determined according to the pressure intensity of the internal liquid on the bottom of the liquid injection device, the density of the internal liquid and the local gravitational acceleration. Therefore, under the condition that the height of the internal liquid is larger than the first liquid level threshold value, liquid injection into the liquid injection device is stopped, an alarm prompt is given out, and therefore automatic stopping of liquid injection of the transformer can be achieved through the liquid level detection method.

Description

Technical Field

[0001] The present invention relates to the technical field of transformer monitoring, and in particular to a transformer and a liquid level detection method thereof. Background Art

[0002] With the digital development of the manufacturing process of various transformers, especially transformers with different oil tank structures, the internal gas pressure of the transformer and the type and weight of the transformer oil required in the post-processing stage of manufacturing and production are different.

[0003] Specifically, during the liquid injection process of the transformer, it is necessary to manually check the liquid level inside the transformer at fixed intervals, and then manually determine whether the liquid level in the transformer has reached the conditions for stopping the liquid injection. However, during the above process, there may be situations such as staff tension, untimely data detection, and data recording errors, which may cause delays in stopping the liquid injection, thereby causing damage to the transformer, and even causing safety accidents in serious cases.

[0004] Therefore, how to realize the automatic stop of transformer liquid injection is a problem to be solved urgently. Summary of the invention

[0005] In view of this, the present invention provides a transformer and a liquid level detection method thereof, so as to realize automatic stopping of liquid injection into the transformer.

[0006] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0007] On one hand, the present application provides a method for detecting the liquid level of a transformer, wherein two pressure sensors are arranged in a liquid injection device in the transformer, and the two pressure sensors are respectively located at the bottom and the top of the liquid injection device; the method for detecting the liquid level of the transformer comprises:

[0008] Obtaining detection results of the two pressure sensors;

[0009] Determining the pressure of the internal liquid of the liquid injection device on the bottom of the liquid injection device according to the two detection results;

[0010] Determining the height of the internal liquid according to the pressure of the internal liquid on the bottom of the liquid injection device, the density of the internal liquid and the local gravitational acceleration;

[0011] Determining whether the height of the internal liquid is greater than or equal to a first liquid level threshold;

[0012] If the height of the internal liquid is greater than or equal to the first liquid level threshold, the injection of liquid into the liquid injection device is stopped and a first alarm prompt is issued.

[0013] Optionally, before stopping the injection of liquid into the liquid injection device and issuing a first alarm prompt, the method further includes:

[0014] Determine whether the height of the internal liquid is greater than or equal to a second liquid level threshold; the second liquid level threshold is greater than the first liquid level threshold;

[0015] If the height of the internal liquid is greater than or equal to the second liquid level threshold, the injection of liquid into the liquid injection device is stopped, and a second alarm prompt is issued; the danger level represented by the second alarm prompt is higher than the danger level represented by the first alarm prompt;

[0016] If the height of the internal liquid is less than the second liquid level threshold, the injection of liquid into the liquid injection device is stopped and a first alarm prompt is issued.

[0017] Optionally, if the height of the internal liquid is less than the first liquid level threshold, the process returns to the step of obtaining the detection results of the two pressure sensors.

[0018] Optionally, after obtaining the detection results of the two pressure sensors, the method further includes:

[0019] Determine whether the detection result of the pressure sensor located at the bottom of the liquid injection device is greater than or equal to a first pressure threshold;

[0020] If the detection result of the pressure sensor located at the bottom of the liquid injection device is greater than or equal to the first pressure threshold, the injection of liquid into the liquid injection device is stopped and a third alarm prompt is issued.

[0021] Optionally, after obtaining the detection results of the two pressure sensors, the method further includes:

[0022] Determine whether the detection result of the pressure sensor located at the top of the liquid injection device is greater than or equal to a second pressure threshold;

[0023] If the detection result of the pressure sensor located at the top of the liquid injection device is greater than or equal to the second pressure threshold, the injection of liquid into the liquid injection device is stopped and a fourth alarm prompt is issued.

[0024] On the other hand, the present application provides a transformer, including: a transformer body, a liquid injection device, a liquid level monitoring system, a liquid injection valve, an alarm device and two detection tools; wherein:

[0025] The liquid injection device comprises a first liquid injection chamber, and the transformer body is arranged in the first liquid injection chamber;

[0026] The injection port of the first liquid injection chamber is connected to the output port of the liquid supply device through a liquid injection pipeline;

[0027] The liquid injection valve is arranged between the injection port of the first liquid injection chamber and the output port of the liquid supply device;

[0028] A first detection tool is arranged at the bottom of the first liquid injection chamber, and the first detection tool comprises a first pressure sensor;

[0029] If the liquid injection device only includes the first liquid injection chamber, the second detection tool is arranged on the top of the first liquid injection chamber, and the second detection tool includes a second pressure sensor;

[0030] The first pressure sensor and the second pressure sensor are both connected to the liquid level monitoring system, the alarm device and the liquid injection valve are both controlled by the liquid level monitoring system, and the liquid level monitoring system is used to execute the liquid level detection method of the transformer as described in any one of the above aspects of the present application.

[0031] Optionally, the liquid injection device further comprises: a second liquid injection chamber; wherein:

[0032] The second liquid injection chamber is arranged at a higher position than the first liquid injection chamber;

[0033] The connection port at the bottom of the second liquid injection chamber is connected to the connection port at the top of the first liquid injection chamber;

[0034] If the liquid injection device includes the first liquid injection chamber and the second liquid injection chamber, the second detection tool is arranged on the top of the second liquid injection chamber.

[0035] Optionally, the liquid level monitoring system comprises: a signal converter and a controller; wherein:

[0036] The first pressure sensor and the second pressure sensor are both connected to the controller via the signal converter, and the signal converter is used to convert the output signal of the first pressure sensor and the output signal of the second pressure sensor into a signal type that can be read by the controller;

[0037] The alarm device and the liquid injection valve are both controlled by the controller, and the controller is used to execute the liquid level detection method for the transformer as described in any one of the above aspects of the present application.

[0038] Optionally, it also includes: a filtering device; wherein:

[0039] The filtering device is disposed between: the injection port of the first liquid injection chamber and the output port of the liquid supply device;

[0040] The filtering device is controlled by the liquid level monitoring system.

[0041] Optionally, the alarm device includes any one of the following: a sound alarm, an optical alarm, or an audible and visual alarm.

[0042] It can be seen from the above technical solution that the present invention provides a liquid level detection method for a transformer. Since two pressure sensors are respectively located at the bottom and top of a liquid injection device, and liquid is injected into the liquid injection device, one can detect the pressure exerted on the bottom of the liquid injection device by the internal liquid of the liquid injection device and the internal gas of the liquid injection device, and the other can detect the gas pressure of the internal gas. Therefore, the pressure exerted on the bottom of the liquid injection device by the internal liquid can be determined according to the detection results of the two pressure sensors, and the height of the internal liquid can be determined according to the pressure exerted on the bottom of the liquid injection device by the internal liquid, the density of the internal liquid, and the local gravitational acceleration. Furthermore, when the height of the internal liquid is greater than the first liquid level threshold, the liquid injection into the liquid injection device can be stopped and an alarm can be issued. Therefore, the liquid level detection method can realize the automatic stop of liquid injection of the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0044] Figure 1 A schematic flow chart of an implementation of a method for detecting a liquid level of a transformer provided in an embodiment of the present application;

[0045] Figure 2 A flow chart of another implementation of a method for detecting a liquid level of a transformer provided in an embodiment of the present application;

[0046] Figure 3 A schematic flow chart of another implementation of the method for detecting the liquid level of a transformer provided in an embodiment of the present application;

[0047] Figure 4 A schematic flow chart of another implementation of the method for detecting the liquid level of a transformer provided in an embodiment of the present application;

[0048] Figure 5 A schematic diagram of a structure of a transformer according to an embodiment of the present application;

[0049] Figure 6 A schematic structural diagram of another implementation of a transformer provided in an embodiment of the present application;

[0050] Figure 7A schematic structural diagram of another implementation manner of the transformer provided in an embodiment of the present application. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0052] In this application, relational terms such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0053] In order to realize automatic stop of liquid injection of transformer, the embodiment of the present application provides a liquid level detection method of transformer. Two pressure sensors are arranged in the liquid injection device of the transformer, and the two pressure sensors are respectively located at the bottom and the top of the liquid injection device.

[0054] In order to protect the transformer, a liquid with insulation, heat dissipation, anti-corrosion and other functions is usually injected into the transformer, and the device used to hold the liquid in the transformer is the liquid injection device. Usually, the liquid injected into the transformer is transformer oil, so the liquid injection device can also be called an oil injection device.

[0055] It should be noted that, in general, the liquid injection device is a closed device, so as the amount of liquid injected into the liquid injection device gradually increases, the height of the liquid in the liquid injection device will gradually increase, so that the space occupied by the gas in the liquid injection device will gradually decrease, and then the gas pressure of the gas in the liquid injection device will gradually increase. Among them, the liquid in the liquid injection device is called the internal gas of the liquid injection device, and the gas in the liquid injection device is called the internal gas of the liquid injection device.

[0056] The specific process of the transformer liquid level detection method is as follows Figure 1 As shown, the specific steps include:

[0057] S110, obtaining detection results of two pressure sensors.

[0058] Since the two pressure sensors are respectively located at the bottom and top of the liquid injection device, and liquid is injected into the liquid injection device, the pressure sensor located at the bottom of the liquid injection device can detect the combined pressure of the internal liquid and the internal gas on the bottom of the liquid injection device, and the pressure sensor located at the top of the liquid injection device can detect the air pressure of the internal gas.

[0059] S120. Determine the pressure of the internal liquid on the bottom of the liquid injection device based on the two detection results.

[0060] Specifically, according to the following formula, the pressure of the internal liquid of the liquid injection device on the bottom of the liquid injection device can be determined based on the two test results:

[0061] P 液 =P 底 -P 顶

[0062] Among them, P 液 is the pressure of the internal liquid on the bottom of the injection device, P 底 is the detection result of the pressure sensor at the bottom of the injection device, P 顶 This is the detection result of the pressure sensor located on the top of the injection device.

[0063] S130. Determine the height of the internal liquid according to the pressure of the internal liquid on the bottom of the liquid injection device, the density of the internal liquid and the local gravitational acceleration.

[0064] Specifically, the height of the internal liquid can be determined according to the pressure of the internal liquid on the bottom of the liquid injection device, the density of the internal liquid and the local gravity acceleration according to the following formula:

[0065] H 液 =P 液 / (ρ×g)

[0066] Among them, H 液 is the height of the internal liquid, ρ is the density of the internal liquid, and g is the local gravitational acceleration.

[0067] It should be noted that the density of the internal liquid is pre-set. How to set it will be described in detail in the following embodiments and will not be repeated here. Usually, the density of the internal liquid is set to 880 kg / m 3 In addition, if the actual value of the density of the internal liquid is significantly different from the originally set value, the density of the internal liquid needs to be reset.

[0068] S140, determining whether the height of the internal liquid is greater than or equal to a first liquid level threshold.

[0069] If the height of the internal liquid is greater than or equal to the first liquid level threshold, step S150 is executed; if the height of the internal liquid is less than the first liquid level threshold, the process returns to step S110.

[0070] If the height of the internal liquid is greater than or equal to the first liquid level threshold, it indicates that the height of the internal liquid may cause damage to the liquid injection device, that is, it may cause damage to the transformer. Conversely, if the height of the internal liquid is less than the first liquid level threshold, it indicates that the height of the internal liquid is almost impossible to cause damage to the liquid injection device.

[0071] It should be noted that the first liquid level threshold is pre-set. How to set it will be described in detail in the following embodiments and will not be repeated here.

[0072] S150, stop injecting liquid into the liquid injection device and issue a first alarm prompt.

[0073] It should be noted that how to stop injecting liquid into the liquid injection device and how to issue the first alarm prompt will be described in detail in the following embodiments and will not be repeated here.

[0074] Since the two pressure sensors are respectively located at the bottom and the top of the liquid injection device, and the liquid injection device is filled with liquid, one pressure sensor can detect the pressure of the internal liquid of the liquid injection device and the internal gas of the liquid injection device on the bottom of the liquid injection device, and the other pressure sensor can detect the air pressure of the above-mentioned internal gas. Therefore, the pressure of the above-mentioned internal liquid on the bottom of the liquid injection device can be determined according to the detection results of the two pressure sensors, and then the height of the above-mentioned internal liquid can be determined according to the pressure of the above-mentioned internal liquid on the bottom of the liquid injection device, the density of the above-mentioned internal liquid and the local gravitational acceleration. Furthermore, when the height of the above-mentioned internal liquid is greater than the first liquid level threshold, the injection of liquid into the liquid injection device can be stopped and an alarm prompt can be issued. Therefore, the liquid level detection method can realize the automatic stop of transformer liquid injection.

[0075] Another embodiment of the present application provides another implementation of a transformer liquid level detection method, the specific process of which is as follows: Figure 2 Before executing step S150 in the above embodiment, this embodiment further includes the following steps:

[0076] S210: Determine whether the height of the internal liquid is greater than or equal to a second liquid level threshold.

[0077] If the height of the internal liquid is greater than or equal to the second liquid level threshold, step S220 is executed; if the height of the internal liquid is less than the second liquid level threshold, step S150 is executed.

[0078] The second liquid level threshold is greater than the first liquid level threshold.

[0079] If the height of the internal liquid is greater than or equal to the second liquid level threshold, it indicates that the height of the internal liquid is likely to cause damage to the liquid injection device. On the contrary, if the height of the internal liquid is less than the second liquid level threshold, it indicates that the height of the internal liquid is unlikely to cause damage to the liquid injection device.

[0080] It should be noted that the second liquid level threshold is pre-set. How to set it will be described in detail in the following embodiments and will not be repeated here.

[0081] S220, stop injecting liquid into the liquid injection device and issue a second alarm prompt.

[0082] The danger level represented by the second alarm prompt is higher than the danger level represented by the first alarm prompt. It should be noted that the higher the danger level, the greater the possibility that the injection device is damaged, and the lower the danger level, the less likely the injection device is damaged.

[0083] It should be noted that how to stop injecting liquid into the liquid injection device and how to issue a second alarm prompt will be described in detail in the following embodiments and will not be repeated here.

[0084] In this embodiment, by setting a second liquid level threshold, the possibility of the height of the internal liquid causing damage to the liquid injection device is subdivided, and different alarm prompts are used to prompt the staff. Therefore, the staff can understand the possible extent of damage to the liquid injection device through the different alarm prompts.

[0085] Another embodiment of the present application provides another implementation method of a transformer liquid level detection method, and its specific process can be found in Figure 3 ( Figure 3 Only in Figure 1 To simplify the view, Figure 3 Steps S120 to S150 are not shown). This embodiment further includes the following steps after step S110 in any of the above embodiments:

[0086] S310, determining whether the detection result of the pressure sensor located at the bottom of the liquid injection device is greater than or equal to a first pressure threshold.

[0087] If the detection result of the pressure sensor at the bottom of the injection device is greater than or equal to the first pressure threshold, execute step S320; if the detection result of the pressure sensor at the bottom of the injection device is less than the first pressure threshold, return to execute step S110.

[0088] From the above, it can be seen that the detection result of the pressure sensor located at the bottom of the liquid injection device is: the pressure exerted by the internal liquid and the internal gas on the bottom of the liquid injection device. Therefore, the detection result of the pressure sensor located at the bottom of the liquid injection device is greater than or equal to the first pressure threshold, indicating that the pressure exerted by the internal liquid and the internal gas on the bottom of the liquid injection device is very large, which may cause damage to the bottom of the liquid injection device, that is, it may cause damage to the transformer. On the contrary, the detection result of the pressure sensor located at the bottom of the liquid injection device is less than the first pressure threshold, indicating that the pressure exerted by the internal liquid and the internal gas on the bottom of the liquid injection device is not very large, and it is almost impossible to cause damage to the bottom of the liquid injection device, that is, it is almost impossible to cause damage to the transformer.

[0089] It should be noted that the first pressure threshold is pre-set, and how to set it will be described in detail in the following embodiments and will not be repeated here.

[0090] S320, stop injecting liquid into the liquid injection device and issue a third alarm prompt.

[0091] It should be noted that how to stop injecting liquid into the liquid injection device and how to issue the third alarm prompt will be described in detail in the following embodiments and will not be repeated here.

[0092] Optionally, the third alarm prompt may be the same as the first alarm prompt, may be the same as the second alarm prompt, or may be different from both the first alarm prompt and the second alarm prompt. No specific limitation is made here and it may depend on the specific circumstances and is within the scope of protection of this application.

[0093] In this embodiment, since the detection result of the pressure sensor located at the bottom of the liquid injection device is greater than or equal to the first pressure threshold, it indicates that the internal liquid and the internal gas together exert a very large pressure on the bottom of the liquid injection device, which may cause damage to the liquid injection device. Therefore, by comparing the detection result of the pressure sensor located at the bottom of the liquid injection device with the first pressure threshold, it is possible to determine whether the bottom of the liquid injection device may be damaged. Since this embodiment stops injecting liquid into the liquid injection device and issues a third alarm when it is determined that the bottom of the liquid injection device may be damaged, this embodiment reduces the possibility of damage to the bottom of the liquid injection device, thereby reducing the possibility of damage to the transformer.

[0094] Another embodiment of the present application provides another implementation method of a transformer liquid level detection method, and its specific process can be found in Figure 4 ( Figure 4 Only in Figure 3 This embodiment further includes the following steps after step S110 in any of the above embodiments:

[0095] S410, determining whether the detection result of the pressure sensor located at the top of the liquid injection device is greater than or equal to a second pressure threshold.

[0096] If the detection result of the pressure sensor located at the top of the injection device is greater than or equal to the second pressure threshold, execute step S420; if the detection result of the pressure sensor located at the top of the injection device is less than the second pressure threshold, return to execute step S110.

[0097] As can be seen from the above, the detection result of the pressure sensor located at the top of the liquid injection device is: the gas pressure of the above internal gas, so the detection result of the pressure sensor located at the top of the liquid injection device is greater than or equal to the second pressure threshold, indicating that: the gas pressure of the above internal gas is very large, which may cause damage to the top of the liquid injection device, that is, it may cause damage to the transformer. Conversely, the detection result of the pressure sensor located at the top of the liquid injection device is less than the second pressure threshold, indicating that: the gas pressure of the above internal gas is not very large, and it is almost impossible to cause damage to the top of the liquid injection device, that is, it is almost impossible to cause damage to the transformer.

[0098] It should be noted that the second pressure threshold is pre-set. How to set it will be described in detail in the following embodiments and will not be repeated here.

[0099] S420, stop injecting liquid into the liquid injection device and issue a fourth alarm prompt.

[0100] It should be noted that how to stop injecting liquid into the liquid injection device and how to issue the fourth alarm prompt will be described in detail in the following embodiments and will not be repeated here.

[0101] Optionally, the fourth alarm prompt may be the same as the first alarm prompt, may be the same as the second alarm prompt, or may be different from both the first alarm prompt and the second alarm prompt. No specific limitation is made here and it may depend on the specific circumstances and is within the scope of protection of this application.

[0102] In this embodiment, since the detection result of the pressure sensor located at the top of the liquid injection device is greater than or equal to the second pressure threshold, it indicates that the air pressure of the above-mentioned internal gas is very large and may cause damage to the top of the liquid injection device. Therefore, by comparing the detection result of the pressure sensor located at the top of the liquid injection device with the second pressure threshold, it can be determined whether the top of the liquid injection device may be damaged. Since this implementation stops injecting liquid into the liquid injection device and issues a fourth alarm when it is determined that the top of the liquid injection device may be damaged, this implementation reduces the possibility of damage to the top of the liquid injection device, thereby reducing the possibility of damage to the transformer.

[0103] Another embodiment of the present application provides a transformer, whose specific structure is as follows: Figure 5As shown, it specifically includes: a transformer body 10, a liquid injection device, a liquid level monitoring system 20, a liquid injection valve 30, an alarm device 40, a first detection tool 50 and a second detection tool 60.

[0104] The liquid injection device includes a first liquid injection chamber 70, and the transformer body 10 is disposed in the first liquid injection chamber 70. When liquid is injected into the first liquid injection chamber 70, the transformer body 10 is immersed in the liquid. The function of the liquid has been described in detail in the above embodiment and will not be repeated here.

[0105] It should be noted that the transformer body 10 refers to the liquid part such as transformer oil, and generally includes an iron core and a winding. In addition, the transformer body 10 is already very mature in the prior art, and will not be described in detail here.

[0106] The injection port of the first injection chamber 70 is connected to the output port of the liquid supply device 80 through the injection pipeline. Generally, the injection port of the first injection chamber 70 is arranged at the bottom of the first injection chamber 70, such as Figure 5 Of course, the injection port of the first injection chamber 70 can also be set at other positions, not limited to the example given here.

[0107] It should be noted that, usually, the liquid supply device 80 is called an oil tank.

[0108] The liquid injection valve 30 is disposed between the injection port of the first liquid injection chamber 70 and the output port of the liquid supply device 80. For example, the liquid injection valve 30 is disposed on the injection port of the first liquid injection chamber 70. Figure 5 Of course, the liquid injection valve 30 can also be set at other positions that meet the above requirements, and is not limited to the examples given.

[0109] The first detection fixture 50 is disposed at the bottom of the first liquid injection chamber 70, and the first detection fixture 50 includes a first pressure sensor. Figure 5 As shown, a first connection port is also provided at the bottom of the first liquid injection chamber 70, a first valve is provided at the first connection port, the first detection fixture 50 is installed on the first valve, and the first pressure sensor in the first detection fixture 50 is specifically installed on the threaded joint of the first detection fixture 50. In addition, before use, the oil drain ball valve on the first detection fixture 50 needs to be closed and the first valve needs to be opened so that the internal liquid can flow into the first detection fixture 50 but not out.

[0110] In practical applications, the first valve is preferably located away from the liquid injection valve 30 to reduce the possibility of affecting the detection of the first detection tool 50 during liquid injection.

[0111] It should be noted that the sealing between the first detection tool 50 and the first valve needs to be ensured, and the sealing between the first pressure sensor and the first detection tool 50 also needs to be ensured.

[0112] If the liquid injection device only includes the first liquid injection chamber 70, the second detection fixture 60 is arranged at the top of the first liquid injection chamber 70, and the second detection fixture 60 includes a second pressure sensor. Specifically, a second connection port is also arranged at the top of the first liquid injection chamber 70, a second valve is arranged at the second connection port, the second detection fixture 60 is installed on the second valve, and the second pressure sensor in the second detection fixture 60 is specifically installed on the threaded joint of the second detection fixture 60. In addition, before use, it is necessary to close the oil drain ball valve on the second detection fixture 60 and open the second valve so that the internal liquid flows into the second detection fixture 60 but does not flow out.

[0113] It should be noted that the sealing between the second detection fixture 60 and the second valve needs to be ensured, and the sealing between the second pressure sensor and the second detection fixture 60 also needs to be ensured.

[0114] The first pressure sensor and the second pressure sensor are both connected to the liquid level monitoring system 20, the alarm device 40 and the liquid injection valve 30 are both controlled by the liquid level monitoring system 20, and the liquid level monitoring system 20 is used to execute the transformer liquid level detection method provided in any of the above embodiments.

[0115] When it is necessary to stop injecting liquid into the liquid injection device, the liquid level monitoring system 20 controls the liquid injection valve 30 to close.

[0116] When a first alarm prompt needs to be issued, the liquid level monitoring system 20 controls the alarm device 40 to be in the first working mode. When a second alarm prompt needs to be issued, the liquid level monitoring system 20 controls the alarm device 40 to be in the second working mode. When a third alarm prompt needs to be issued, the liquid level monitoring system 20 controls the alarm device 40 to be in the third working mode. When a fourth alarm prompt needs to be issued, the liquid level monitoring system 20 controls the alarm device 40 to be in the fourth working mode.

[0117] It should be noted that the third working mode is related to the third alarm prompt, and the fourth working mode is related to the fourth alarm prompt. For example, if the third alarm prompt is the same as the second alarm prompt, the third working mode is the same as the second working mode. If the fourth alarm prompt is the same as the second alarm prompt, the fourth working mode is the same as the second working mode.

[0118] In a specific example, the alarm device 40 includes any one of the following: a sound alarm, an optical alarm, or an audible and visual alarm.

[0119] The above example only shows one implementation of the alarm device 40. In practical applications, including but not limited to this, no specific limitation is made here and it can be determined according to the specific situation, all of which are within the scope of protection of this application.

[0120] Taking the alarm device 40 as an optical alarm as an example, assuming that the third alarm prompt and the fourth alarm prompt are the same as the second alarm prompt. When the first alarm prompt needs to be issued, the liquid level monitoring system 20 lights up the yellow light in the alarm device 40, and when the second alarm prompt, the third alarm prompt, and the fourth alarm prompt need to be issued, the liquid level monitoring system 20 lights up the red light in the alarm device 40.

[0121] In addition, the liquid level monitoring system 20 is also connected to the microcomputer in the control cabinet. The staff sets the first liquid level threshold, the second liquid level threshold, the first pressure threshold, the second pressure threshold and the density of the internal liquid through the setting box popped up on the microcomputer.

[0122] If the liquid level detection method for the transformer executed by the liquid level monitoring system 20 includes S110~S150, S310, S320, S410, S420, or includes S110~S150, S210, S220, S310, S320, S410, S420, the staff can also select through the microcomputer whether the liquid level monitoring system 20 is operating in the first mode or the second mode, that is, select whether the liquid level monitoring system 20 specifically executes steps S120~S150 in the liquid level detection method for the transformer. Taking the liquid level detection method of the transformer executed by the liquid level monitoring system 20 including S110~S150, S310, S320, S410, and S420 as an example, if the staff selects the liquid level monitoring system 20 to work in the first mode through the microcomputer, the liquid level monitoring system 20 executes all the steps in the liquid level detection method of the transformer, namely S110~S150, S310, S320, S410, and S420; if the staff selects the liquid level monitoring system 20 to work in the second mode through the microcomputer, the liquid level monitoring system 20 executes part of the steps in the liquid level detection method of the transformer, namely S310, S320, S410, and S420.

[0123] In this embodiment, since the liquid level monitoring system 20 is used to execute the liquid level detection method provided in any of the above embodiments, the transformer provided in this embodiment can stop injecting liquid into the injection device and issue an alarm prompt under corresponding circumstances. Therefore, the transformer provided in this embodiment can realize automatic stopping of its own injection.

[0124] Another embodiment of the present application provides an implementation of a liquid injection device, and its specific structure is as follows: Figure 6 As shown, this embodiment, based on the above embodiment, further includes: a second liquid injection chamber 90.

[0125] The second injection chamber 90 is arranged at a higher position than the first injection chamber 70, and the connection port at the bottom of the second injection chamber 90 is connected to the connection port at the top of the first injection chamber 70. In practical applications, the second injection chamber 90 is usually called an oil storage tank.

[0126] If the liquid injection device includes a first liquid injection chamber 70 and a second liquid injection chamber 90, the second detection tool 60 is disposed on the top of the second liquid injection chamber 90. Figure 6 As shown, a third connection port is also provided at the top of the second liquid injection chamber 90, a third valve is provided at the third connection port, the second detection fixture 60 is installed on the third valve, and the second pressure sensor in the second detection fixture 60 is specifically installed on the threaded joint of the second detection fixture 60. In addition, before use, the oil drain ball valve on the second detection fixture 60 needs to be closed, and the third valve needs to be opened so that the internal liquid can flow into the second detection fixture 60 but not out.

[0127] It should be noted that the sealing between the second detection fixture 60 and the third valve needs to be ensured, and the sealing between the second pressure sensor and the second detection fixture 60 also needs to be ensured.

[0128] Since the second liquid injection chamber 90 is arranged at a higher position than the first liquid injection chamber 70, and the connection port at the bottom of the second liquid injection chamber 90 is connected to the connection port at the top of the first liquid injection chamber 70, when the height of the liquid in the first liquid injection chamber 70 is reduced, the liquid in the second liquid injection chamber 90 will be immediately replenished under the action of gravity, so that the transformer body 10 can always be immersed in the injected liquid, thereby better playing the role of insulation, heat dissipation, anti-corrosion, etc. for the transformer body 10.

[0129] Another embodiment of the present application provides a specific implementation of the liquid level monitoring system 20, and its specific structure is as follows: Figure 5 or Figure 6 As shown, it specifically includes: a signal converter 21 and a controller 22.

[0130] The first pressure sensor and the second pressure sensor are both connected to the controller 22 via a signal converter 21 . The signal converter 21 is used to convert the output signal of the first pressure sensor and the output signal of the second pressure sensor into a signal type that can be read by the controller 22 .

[0131] It should be noted that the signal converter 21 is already very mature in the prior art and will not be described in detail here.

[0132] The alarm device 40 and the liquid injection valve 30 are both controlled by the controller 22, and the controller 22 is used to execute the liquid level detection method provided by any one of the above embodiments.

[0133] It should be noted that the control of the alarm device 40 and the liquid injection valve 30 by the controller 22 is the same as the control of the alarm device 40 and the liquid injection valve 30 by the liquid level monitoring system 20, which will not be repeated here.

[0134] The above is only a specific implementation of the liquid level monitoring system 20. In practical applications, including but not limited to this, no specific limitation is made here and it can be determined according to the specific situation, all of which are within the protection scope of this application.

[0135] Another embodiment of the present application provides another implementation of the transformer, and its specific structure is as follows: Figure 7 This embodiment, based on any one of the above embodiments, further includes: a filtering device 100.

[0136] The filter device 100 is disposed between the injection port of the first liquid injection chamber 70 and the output port of the liquid supply device 80. The filter device 100 is controlled by the liquid level monitoring system 20. Figure 7 As shown, the liquid level monitoring system 20 includes a signal converter 21 and a controller 22 , and the filtering device 100 is controlled by the controller 22 .

[0137] If the transformer includes the filtering device 100 , when it is necessary to stop injecting liquid into the liquid injection device, the liquid level monitoring system 20 controls the filtering device 100 to be in a shutdown state, and controls the liquid injection valve 30 to be closed.

[0138] It should be noted that the control of the filter device 100 by the controller 22 is the same as the control of the filter device 100 by the liquid level monitoring system 20 , which will not be described in detail here.

[0139] In this embodiment, a filtering device 100 is arranged between the injection port of the first injection chamber 70 and the output port of the liquid supply device 80, which can filter the injected liquid. Therefore, it can avoid the impurities in the injected liquid from affecting the transformer body 10 to a certain extent, that is, it can avoid affecting the transformer to a certain extent, thereby improving the operating safety of the transformer.

[0140] For the above description of the disclosed embodiments, the features recorded in each embodiment in this specification can be replaced or combined with each other, so that professionals and technicians in this field can implement or use this application. The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above with a preferred embodiment, it is not used to limit the present invention. Any technician familiar with the field can make many possible changes and modifications to the technical solution of the present invention using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A method for detecting liquid level of a transformer, characterized in that: Two pressure sensors are arranged in the liquid injection device in the transformer, and the two pressure sensors are respectively located at the bottom and the top of the liquid injection device; the liquid level detection method of the transformer includes: Obtaining detection results of the two pressure sensors; Determine the pressure of the internal liquid of the liquid injection device on the bottom of the liquid injection device according to the two detection results; Determining the height of the internal liquid according to the pressure of the internal liquid on the bottom of the liquid injection device, the density of the internal liquid and the local gravitational acceleration; Determining whether the height of the internal liquid is greater than or equal to a first liquid level threshold; If the height of the internal liquid is greater than or equal to the first liquid level threshold, the injection of liquid into the liquid injection device is stopped and a first alarm prompt is issued.

2. The transformer liquid level detection method according to claim 1, characterized in that: Before stopping the injection of liquid into the liquid injection device and issuing a first alarm prompt, the method further includes: Determine whether the height of the internal liquid is greater than or equal to a second liquid level threshold; the second liquid level threshold is greater than the first liquid level threshold; If the height of the internal liquid is greater than or equal to the second liquid level threshold, the injection of liquid into the liquid injection device is stopped, and a second alarm prompt is issued; the danger level represented by the second alarm prompt is higher than the danger level represented by the first alarm prompt; If the height of the internal liquid is less than the second liquid level threshold, the injection of liquid into the liquid injection device is stopped and a first alarm prompt is issued.

3. The transformer liquid level detection method according to claim 1, characterized in that: If the height of the internal liquid is less than the first liquid level threshold, the process returns to the step of obtaining the detection results of the two pressure sensors.

4. The transformer liquid level detection method according to any one of claims 1 to 3, characterized in that: After obtaining the detection results of the two pressure sensors, the method further includes: Determine whether the detection result of the pressure sensor located at the bottom of the liquid injection device is greater than or equal to a first pressure threshold; If the detection result of the pressure sensor located at the bottom of the liquid injection device is greater than or equal to the first pressure threshold, the injection of liquid into the liquid injection device is stopped and a third alarm prompt is issued.

5. The transformer liquid level detection method according to any one of claims 1 to 3, characterized in that: After obtaining the detection results of the two pressure sensors, the method further includes: Determine whether the detection result of the pressure sensor located at the top of the liquid injection device is greater than or equal to a second pressure threshold; If the detection result of the pressure sensor located at the top of the liquid injection device is greater than or equal to the second pressure threshold, the injection of liquid into the liquid injection device is stopped and a fourth alarm prompt is issued.

6. A transformer, characterized in that: include: Transformer body, liquid injection device, liquid level monitoring system, liquid injection valve, alarm device and two testing tools; among which: The liquid injection device comprises a first liquid injection chamber, and the transformer body is arranged in the first liquid injection chamber; The injection port of the first liquid injection chamber is connected to the output port of the liquid supply device through a liquid injection pipeline; The liquid injection valve is arranged between the injection port of the first liquid injection chamber and the output port of the liquid supply device; A first detection tool is arranged at the bottom of the first liquid injection chamber, and the first detection tool comprises a first pressure sensor; If the liquid injection device only includes the first liquid injection chamber, the second detection tool is arranged on the top of the first liquid injection chamber, and the second detection tool includes a second pressure sensor; The first pressure sensor and the second pressure sensor are both connected to the liquid level monitoring system, the alarm device and the liquid injection valve are both controlled by the liquid level monitoring system, and the liquid level monitoring system is used to execute the transformer liquid level detection method as described in any one of claims 1 to 5.

7. The transformer according to claim 6, characterized in that: The liquid injection device further comprises: a second liquid injection chamber; wherein: The second liquid injection chamber is arranged at a higher position than the first liquid injection chamber; The connection port at the bottom of the second liquid injection chamber is connected to the connection port at the top of the first liquid injection chamber; If the liquid injection device includes the first liquid injection chamber and the second liquid injection chamber, the second detection tool is arranged on the top of the second liquid injection chamber.

8. The transformer according to claim 6, characterized in that: The liquid level monitoring system comprises: a signal converter and a controller; wherein: The first pressure sensor and the second pressure sensor are both connected to the controller via the signal converter, and the signal converter is used to convert the output signal of the first pressure sensor and the output signal of the second pressure sensor into a signal type that can be read by the controller; The alarm device and the liquid injection valve are both controlled by the controller, and the controller is used to execute the transformer liquid level detection method.

9. The transformer according to claim 6, characterized in that: Also includes: A filtering device; wherein: The filtering device is disposed between: the injection port of the first liquid injection chamber and the output port of the liquid supply device; The filtering device is controlled by the liquid level monitoring system.

10. The transformer according to any one of claims 6 to 9, characterized in that: The alarm device includes any one of the following: a sound alarm, an optical alarm, or an audible and visual alarm.

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