Oil sample return oil liquid bubble eliminating device and method for on-line monitoring of gas in transformer oil

Abstract

The invention discloses an oil sample return oil bubble eliminating device and method for on-line monitoring of gas in transformer oil. The box shell assembly is provided with an inverted-U-shaped flowing channel, the first valve (1) is arranged at the top of the inverted-U-shaped flowing channel of the box shell assembly, the second valve (2) is arranged on one port of the inverted-U-shaped flowing channel of the box shell assembly, and the filter (8) is arranged on the other port of the inverted-U-shaped flowing channel of the box shell assembly. The oil sample return oil liquid upwelling bubble separation is realized, the uniform pressure state treatment of the box shell assembly and the transformer oil liquid storage cabinet is realized through the first valve (1) and the second valve (2), and the bubble blocking and crushing treatment of the separated oil sample return oil liquid is realized through the filter (8). According to the oil sample return oil bubble removal device, bubbles in oil sample return oil liquid are removed in a flowing state, and the technical problems that the bubble condition of the oil sample return oil liquid is manually observed through a transparent pipeline and the oil sample return oil liquid with the bubbles is discharged through a branch pipeline are solved; therefore, the effect of eliminating the bubbles in the returned oil of the oil sample is improved.

Description

Technical Field

[0001] The invention relates to an oil sample return fluid bubble elimination device and method, in particular to an oil sample return fluid bubble elimination device and method for online monitoring of gas in transformer oil. Background Art

[0002] The online monitoring device for dissolved gas in oil is an important equipment for monitoring faults of power transformers. It diagnoses and analyzes the operating status of transformers by monitoring the content of fault gases such as hydrogen, carbon monoxide, methane, ethylene, ethane, acetylene, and carbon dioxide dissolved in oil. When the online monitoring device for gas in oil is used for detection, a certain volume of oil sample is extracted from the transformer by vacuum bubbling and other methods, and the gas dissolved in the oil is extracted and then detected. In order to ensure the safe operation of the transformer, the oil sample after detection must not have bubbles and the oil sample must be safely returned to the transformer body. The detection and oil return process must not contaminate the oil sample. Therefore, the oil sample return oil liquid bubble elimination device used for online monitoring of gas in transformer oil is an important transformer accessory. Among the existing oil sample return oil liquid bubble elimination devices used for online monitoring of gas in transformer oil, there is no oil sample return oil liquid bubble elimination device used for online monitoring of gas in transformer oil. The oil sample return oil bubble status is manually observed through a transparent pipe and the oil sample return oil liquid with bubbles is discharged through a branch pipe. Due to the subjective influence of the operator, the effect of eliminating bubbles in the oil sample return oil liquid is affected. The present invention uses the technical feature of removing bubbles in the oil sample return fluid while it is in a flowing state, and effectively explores and studies the technical problem of manually observing the oil sample return fluid bubble status through a transparent pipe and discharging the oil sample return fluid with bubbles through a branch pipe. The statements here only provide background technology related to the present invention and do not necessarily constitute prior art. The technical solution of the present invention is made based on the technical briefing document provided by the applicant on January 8, 2025, which solves actual technical problems in the work process, and the existing technical problems, technical features and technical effects in similar patent documents and background technologies obtained through retrieval. Summary of the invention

[0003] The object of the present invention is an oil sample return liquid bubble elimination device for online monitoring of gas in transformer oil. The object of the present invention is a method for eliminating bubbles in oil sample return liquid for online monitoring of gas in transformer oil.

[0004] In order to overcome the above technical disadvantages, the purpose of the present invention is to provide an oil sample return fluid bubble elimination device and method for online monitoring of gas in transformer oil, thereby improving the effect of eliminating bubbles in the oil sample return fluid.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: an oil sample return liquid bubble elimination device for online monitoring of gas in transformer oil, comprising a box shell assembly with an inverted U-shaped flow channel, a first valve arranged at the top of the inverted U-shaped flow channel of the box shell assembly, a second valve arranged on one of the ports of the inverted U-shaped flow channel of the box shell assembly, and a filter arranged on another port of the inverted U-shaped flow channel of the box shell assembly.

[0006] Due to the design of the box shell assembly, the first valve, the second valve and the filter, the box shell assembly can be used to separate the rising bubbles of the oil sample return liquid, the first valve and the second valve can be used to put the box shell assembly and the transformer oil storage cabinet in a unified pressure state, the filter can be used to block and crush the bubbles of the precipitated oil sample return liquid, and the bubbles in the oil sample return liquid can be removed while it is in a flowing state, thus solving the technical problem of manually observing the bubble status of the oil sample return liquid through a transparent pipe and discharging the oil sample return liquid with bubbles through a branch pipe, thereby improving the effect of eliminating bubbles in the oil sample return liquid.

[0007] The present invention is designed to interconnect the housing assembly, the first valve, the second valve and the filter in such a way that the bubbles in the oil sample return fluid are removed while in a flowing state.

[0008] The present invention is designed to connect the filter to the housing assembly, the first valve and the second valve in a manner that performs a bubble barrier and crushing process.

[0009] The present invention designs that the box shell assembly is configured to include a tank shell and an isolation plate.

[0010] The technical effects of the above four technical solutions are: realizing the two-step treatment of bubble precipitation and barrier breaking of the oil sample return liquid in the sealed area, no longer using branch pipes to discharge the oil sample return liquid with bubbles, and improving the efficiency of eliminating bubbles in the oil sample return liquid.

[0011] The present invention is designed to further include a first accessory device, and the first accessory device is arranged on the tank shell component, and the first accessory device is arranged as a third valve.

[0012] The present invention is designed to further include a second accessory device and the second accessory device is arranged on the tank shell assembly. The second accessory device is arranged to include a first liquid level sensor, a second liquid level sensor and a third liquid level sensor.

[0013] The technical effects of the above two technical solutions are: realizing the integrated installation of other components, and expanding the technical effects of the present invention.

[0014] The present invention is designed to respectively arrange a first valve, a second valve, a third valve, a first liquid level sensor, a second liquid level sensor and a third liquid level sensor on the tank shell, an isolation plate is arranged in the tank shell and a filter is arranged between the isolation plate and the tank shell, and the filters are arranged to be distributed corresponding to the third valve and the third liquid level sensor.

[0015] The technical effect of the above technical scheme is that the tank shell, the first valve, the second valve, the third valve, the first liquid level sensor, the second liquid level sensor, the third liquid level sensor, the filter and the isolation plate constitute the basic technical scheme of the present invention and solve the technical problem of the present invention.

[0016] The present invention designs that the first valve is configured as a solenoid valve and the inner end port of the first valve is configured to be connected in a communication manner with the tank shell, and the outer end port of the first valve is configured to be connected in a communication manner with the atmospheric environment.

[0017] The present invention designs that the second valve is configured as a solenoid valve and the inner end port of the second valve is configured to be connected to the tank shell, and the outer end port of the second valve is configured to be connected to the transformer oil gas online monitoring output port.

[0018] The technical effects of the above two technical solutions are: realizing the initialization processing of the tank shell and improving the matching performance with the transformer oil storage cabinet.

[0019] The present invention is designed that the filter is set as a transformer oil filter and the peripheral side surfaces of the filter are respectively set to be connected to the tank shell and the isolation plate, the upper end surface of the filter is respectively set to correspond to the second liquid level sensor and the third liquid level sensor, and the lower end surface of the filter is set to correspond to the third valve.

[0020] The technical effect of the above technical solution is that it achieves the blocking of the bubbles in the oil sample return liquid from passing through.

[0021] The present invention is designed that the tank shell is arranged as a vertical tank-shaped body and the middle of the bottom wall of the tank shell is arranged to be connected to the isolation plate, the middle of the top wall of the tank shell is arranged to be connected to the first valve in a communicating manner and the left side of the top wall of the tank shell is arranged to be connected to the first liquid level sensor in a communicating manner, the lower side of the left wall of the tank shell is arranged to be connected to the second valve in a communicating manner and the upper side of the right wall of the tank shell is arranged to be connected to the second liquid level sensor in a communicating manner, the middle of the right wall of the tank shell is arranged to be connected to the third liquid level sensor and the lower end of the middle of the right wall of the tank shell is arranged to be connected to the filter, and the lower side of the right wall of the tank shell is arranged to be connected to the third valve in a communicating manner.

[0022] The present invention is designed that a left chamber body is arranged between the left wall of the tank shell and the isolation plate, and a right chamber body is arranged between the right wall of the tank shell and the isolation plate, the left chamber body is arranged to correspond to the second valve and the first liquid level sensor, and the right chamber body is arranged to correspond to the liquid level sensor, the third liquid level sensor, the filter and the third valve.

[0023] The present invention is designed that the isolation plate is configured as a sheet and the bottom end face of the isolation plate and the front and rear side faces of the isolation plate are respectively configured to be connected to the tank shell, the top end face of the isolation plate is configured to have a gap distribution with the inner wall of the tank shell and the lower side of the right end face of the isolation plate is configured to be connected to the filter.

[0024] The technical effects of the above three technical solutions are: achieving the upwelling and falling flow of the oil sample return liquid, and changing the flow route of the oil sample return liquid.

[0025] The present invention designs that the third valve is configured as a solenoid valve and the inner end port of the third valve is configured to be connected to the tank shell in a communicating manner, and the outer end port of the third valve is configured to be connected to the transformer oil storage cabinet in a communicating manner.

[0026] The technical effect of the above technical solution is: realizing the opening and closing control with the transformer oil storage cabinet, and improving the original sealing performance of the transformer oil storage cabinet.

[0027] The present invention provides that the first liquid level sensor is configured as a contact type liquid level sensor, the actuating portion of the first liquid level sensor is configured to be communicatively connected to the tank shell, and the housing of the first liquid level sensor is configured to be connected to the tank shell.

[0028] The present invention is designed that the second liquid level sensor and the third liquid level sensor are configured as contact liquid level sensors and the touch portion of the second liquid level sensor and the touch portion of the third liquid level sensor are respectively configured to be communicatively connected to the tank shell, and the shell of the second liquid level sensor and the shell of the third liquid level sensor are respectively configured to be connected to the tank shell.

[0029] The technical effect of the above two technical solutions is that the liquid level signal picking of the flow route of the oil sample return liquid is realized.

[0030] The present invention designs that the ratio of the distance L2 between the center line of the third liquid level sensor and the center line of the filter to the distance L1 between the second liquid level sensor and the center line of the filter is set to 1:2.2-4.2.

[0031] The technical effect of the above technical solution is to optimize the distribution of the liquid level signal pickup positions of the flow route of the oil sample return liquid.

[0032] The present invention is designed that the tank shell, the first valve, the second valve, the third valve and the isolation plate are arranged to be distributed with the filter in a filtering and defoaming manner, and the tank shell, the first valve, the second valve, the third valve, the isolation plate and the filter are arranged to be distributed with the first liquid level sensor, the second liquid level sensor and the third liquid level sensor in a bubble state monitoring manner, and the center line of the tank shell, the center line of the first valve and the center line of the isolation plate are arranged on the same straight line.

[0033] The invention provides that at least one filter is arranged between the separating plate and the tank shell.

[0034] The present invention is designed to include a PLC controller, and the interface of the PLC controller is respectively configured to be connected to the control port of the first valve, the control port of the second valve, the control port of the third valve, the output interface of the first liquid level sensor, the output interface of the second liquid level sensor and the output interface of the third liquid level sensor.

[0035] The technical effect of the above technical solution is that the pick-up signals of the first liquid level sensor, the second liquid level sensor and the third liquid level sensor are used as processing data to control the working states of the first valve, the second valve and the third valve according to the program.

[0036] The present invention designs a method for eliminating bubbles in oil sample return liquid for online monitoring of gas in transformer oil, and the steps are: a box shell component is used to realize the precipitation of upwelling bubbles in the oil sample return liquid, a first valve and a second valve are used to realize the treatment of the box shell component and the transformer oil storage cabinet being in a unified pressure state, a filter is used to realize the bubble blocking and crushing treatment of the precipitated oil sample return liquid, and the bubbles in the oil sample return liquid are eliminated while in a flowing state.

[0037] The technical effect of the above technical scheme is: highlighting the technical feature of removing bubbles in the oil sample return liquid while it is in a flowing state, and introducing the application in the technical field of the oil sample return liquid bubble elimination method for online monitoring of gas in transformer oil.

[0038] The present invention is designed, and its steps are: when using the online monitoring device for gas in transformer oil to perform online monitoring of dissolved gas on the oil sample, the first valve and the second valve are closed, and the third valve is opened, so that the transformer oil in the transformer oil storage cabinet is refluxed to the left chamber body and the right chamber body under the pumping action of the pump body; when the transformer oil in the left chamber body and the right chamber body is in a full state, the first valve is opened, the air in the left chamber body and the right chamber body is released, and the left chamber body and the right chamber body are emptied; after the emptying treatment of the left chamber body and the right chamber body is completed, the first valve is closed, and the pump body is closed to cause the transformer oil in the left chamber body and the right chamber body to flow back to the transformer oil storage cabinet, so that the left chamber body and the right chamber body are emptied. The left chamber body and the right chamber body maintain the same pressure state as the transformer oil storage cabinet, so that the third valve is in a closed state, and the initialization processing of the left chamber body and the right chamber body is realized. After the initialization processing of the left chamber body and the right chamber body is completed, the oil sample is injected into the transformer oil gas online monitoring device, and the transformer oil gas online monitoring device performs dissolved gas detection on the oil sample. After the dissolved gas detection of the oil sample is completed, the second valve and the third valve are in an open state, and the oil sample return oil liquid is injected into the left chamber body through the second valve. In the left chamber body, the bubbles of the oil sample return oil liquid are precipitated and rise to the top of the tank shell. The precipitated oil sample return oil liquid flows into the right chamber body. When the precipitated oil sample return oil liquid flows to the transformer oil storage through the filter and the third valve When the filter is in operation, the air bubbles still existing in the precipitated oil sample return oil liquid are eliminated by the filter. When the oil sample return oil liquid is injected into the left chamber body through the second valve, the first liquid level sensor picks up the liquid level signal of the oil sample return oil liquid in the left chamber body. When the precipitated oil sample return oil liquid flows into the right chamber body, the second liquid level sensor and the third liquid level sensor pick up the liquid level signal of the precipitated oil sample return oil liquid in the left chamber body. The timing starts from the time when the first liquid level sensor picks up the liquid level signal of the oil sample return oil liquid in the left chamber body, and the timing ends when the second liquid level sensor picks up the liquid level signal of the precipitated oil sample return oil liquid in the left chamber body. The filling time T of the precipitated oil sample return oil liquid to the filter is obtained. When the third liquid level sensor does not pick up the liquid level of the precipitated oil sample return oil liquid in the left chamber body, the liquid level of the precipitated oil sample return oil liquid in the left chamber body is detected. When the signal or the third liquid level sensor picks up the liquid level signal of the precipitated oil sample return liquid in the left chamber body and the filling time T is less than the specified minimum time value and the filling time T is greater than the specified maximum time value, a signal is input to the second valve and the third valve, so that the second valve and the third valve are in a closed state, and it is necessary to manually eliminate bubbles from the oil sample return liquid in the left chamber body and the right chamber body. When the third liquid level sensor picks up the liquid level signal of the precipitated oil sample return liquid in the left chamber body and the filling time T is between the specified minimum time value and the specified maximum time value, the oil sample return liquid is in a normal state and refluxes to the transformer oil storage cabinet. When the reflux to the transformer oil storage cabinet is completed, the second valve and the third valve are in a closed state.

[0039] The technical effect of the above technical solution is that: the oil sample return liquid is returned to the transformer oil storage cabinet in a bubble-free state without the need for operator intervention.

[0040] The present invention is designed that the prescribed minimum time value of the filling time T is set to 5 minutes and the prescribed maximum time value of the filling time T is set to 1440 minutes.

[0041] The technical effect of the above technical solution is that the optimal value setting of the filling time T is achieved.

[0042] The present invention is designed, and its steps are: when the PLC controller receives input signals from the first liquid level sensor, the second liquid level sensor and the third liquid level sensor, the input signals from the first liquid level sensor, the second liquid level sensor and the third liquid level sensor are processed and the filling time T is obtained; when the PLC controller inputs signals to the control port of the first valve, the control port of the second valve and the control port of the third valve, the working states of the first valve, the second valve and the third valve are controlled.

[0043] The technical effect of the above technical solution is: realizing the automatic control operation by the PLC controller.

[0044] In this technical solution, the first valve, the second valve and the filter are basic components and are also necessary technical features of the present invention. The tank shell, the third valve, the first liquid level sensor, the second liquid level sensor, the third liquid level sensor and the isolation plate are functional components and are features for achieving other technical effects of the present invention. The design of these technical features of the left chamber body and the right chamber body is a technical feature that complies with the Patent Law and its implementing rules.

[0045] In the technical solution, the bubbles in the oil sample return liquid are removed while in a flowing state, and the removal process is implemented by a filter.

[0046] In the present technical scheme, the box shell assembly, the first valve, the second valve and the filter are important technical features for removing bubbles in the oil sample return liquid in a flowing state. In the technical field of the oil sample return liquid bubble elimination device and method for online monitoring of gas in transformer oil, it has novelty, creativity and practicality. The terms in the present technical scheme can be explained and understood using the patent literature in this technical field. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] 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 some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0048] Figure 1 This is a schematic diagram of one of the first embodiments of an oil sample return liquid bubble elimination device for online monitoring of gas in transformer oil according to the present invention. Tank shell-5, first valve-1, second valve-2, third valve-3, first liquid level sensor-4, second liquid level sensor-6, third liquid level sensor-7, filter-8, isolation plate-9, left chamber body-51, right chamber body-52. DETAILED DESCRIPTION

[0049] According to the Examination Guidelines, terms such as “having”, “including” and “comprising” used in the present invention should be understood as not dispensing with the existence or addition of one or more other elements or combinations thereof.

[0050] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0051] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. In addition, unless otherwise specified, the equipment and materials used in the following examples are commercially available. If the processing conditions are not clearly stated, please make improvements according to conventional methods in the art.

[0053] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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 are within the scope of protection of the present invention.

[0054] An oil sample return liquid bubble elimination device for online monitoring of gas in transformer oil. Figure 1 This is one of the first embodiments of the present invention, and this embodiment is specifically described in conjunction with the accompanying drawings. It includes a tank shell 5, a first valve 1, a second valve 2, a third valve 3, a first liquid level sensor 4, a second liquid level sensor 6, a third liquid level sensor 7, a filter 8 and an isolation plate 9. The first valve 1, the second valve 2, the third valve 3, the first liquid level sensor 4, the second liquid level sensor 6 and the third liquid level sensor 7 are respectively arranged on the tank shell 5, an isolation plate 9 is arranged in the tank shell 5, and a filter 8 is arranged between the isolation plate 9 and the tank shell 5. The filters 8 are respectively arranged to be distributed corresponding to the third valve 3 and the third liquid level sensor 7.

[0055] The second embodiment of the present invention is described in detail with reference to the accompanying drawings. In this embodiment, the tank shell 5 is configured as a vertical tank-shaped body and the middle of the bottom wall of the tank shell 5 is configured to be connected to the isolation plate 9, the middle of the top wall of the tank shell 5 is configured to be connected to the first valve 1 in a communicating manner and the left side of the top wall of the tank shell 5 is configured to be connected to the first liquid level sensor 4 in a communicating manner, the lower side of the left wall of the tank shell 5 is configured to be connected to the second valve 2 in a communicating manner and the upper side of the right wall of the tank shell 5 is configured to be connected to the second liquid level sensor 6 in a communicating manner, the middle of the right wall of the tank shell 5 is configured to be connected to the third liquid level sensor 7 in a communicating manner and the lower end of the middle of the right wall of the tank shell 5 is configured to be connected to the filter 8, and the lower side of the right wall of the tank shell 5 is configured to be connected to the third valve 3 in a communicating manner.

[0056] Through the tank shell 5, supporting connection points for the first valve 1, the second valve 2, the third valve 3, the first liquid level sensor 4, the second liquid level sensor 6, the third liquid level sensor 7, the filter 8 and the isolation plate 9 are formed. The tank shell 5 realizes the connection with the first valve 1, the connection with the second valve 2, the connection with the third valve 3, the connection with the first liquid level sensor 4, the connection with the second liquid level sensor 6, the connection with the third liquid level sensor 7, the connection with the filter 8 and the connection with the isolation plate 9. The technical purpose is to serve as a supporting carrier for the first valve 1, the second valve 2, the third valve 3, the first liquid level sensor 4, the second liquid level sensor 6, the third liquid level sensor 7 and the filter 8.

[0057] In this embodiment, a left chamber body 51 is formed between the left wall of the tank shell 5 and the isolation plate 9, and a right chamber body 52 is formed between the right wall of the tank shell 5 and the isolation plate 9. The left chamber body 51 is respectively arranged to correspond to the second valve 2 and the first liquid level sensor 4, and the right chamber body 52 is respectively arranged to correspond to the liquid level sensor 6, the third liquid level sensor 7, the filter 8 and the third valve 3.

[0058] The technical purpose is to achieve separation processing of bubbles in the oil sample return liquid by the left chamber body 51 and monitoring processing of bubbles in the oil sample return liquid by the right chamber body 52.

[0059] In this embodiment, the first valve 1 is configured as a solenoid valve and the inner end port of the first valve 1 is configured to be connected in communication with the tank shell 5, and the outer end port of the first valve 1 is configured to be connected in communication with the atmospheric environment.

[0060] A supporting connection point for the tank shell 5 is formed by the first valve 1, and the connection with the tank shell 5 is realized by the first valve 1. Its technical purpose is to be used as a component for connecting the tank shell 5 with the atmospheric environment.

[0061] In this embodiment, the second valve 2 is configured as a solenoid valve and the inner end port of the second valve 2 is configured to be connected to the tank shell 5, and the outer end port of the second valve 2 is configured to be connected to the transformer oil gas online monitoring output port.

[0062] A supporting connection point for the tank shell 5 is formed by the second valve 2, and the connection with the tank shell 5 is realized by the second valve 2. Its technical purpose is to serve as a component for connecting the tank shell 5 with the output port of the online monitoring of gas in transformer oil.

[0063] In this embodiment, the third valve 3 is configured as a solenoid valve and the inner end port of the third valve 3 is configured to be connected in communication with the tank shell 5, and the outer end port of the third valve 3 is configured to be connected in communication with the transformer oil storage cabinet.

[0064] A supporting connection point for the tank shell 5 is formed by the third valve 3, and the connection with the tank shell 5 is realized by the third valve 3. Its technical purpose is to be used as a component for connecting the tank shell 5 with the transformer oil storage cabinet.

[0065] In this embodiment, the first liquid level sensor 4 is configured as a contact type liquid level sensor, and the actuating portion of the first liquid level sensor 4 is configured to be communicatively connected to the tank shell 5 , and the housing of the first liquid level sensor 4 is configured to be connected to the tank shell 5 .

[0066] A supporting connection point for the tank shell 5 is formed by the first liquid level sensor 4 , and the connection with the tank shell 5 is realized by the first liquid level sensor 4 . Its technical purpose is to be used as a component for picking up the oil sample return liquid level signal in the left chamber body 51 .

[0067] In this embodiment, the second liquid level sensor 6 and the third liquid level sensor 7 are configured as contact liquid level sensors and the touch portion of the second liquid level sensor 6 and the touch portion of the third liquid level sensor 7 are respectively configured to be communicatively connected to the tank shell 5, and the shell of the second liquid level sensor 6 and the shell of the third liquid level sensor 7 are respectively configured to be connected to the tank shell 5.

[0068] A supporting connection point for the tank shell 5 is formed by the second liquid level sensor 6 and the third liquid level sensor 7. The second liquid level sensor 6 and the third liquid level sensor 7 realize the connection with the tank shell 5. The technical purpose is to serve as a component for picking up the oil sample return liquid level signal in the right chamber body 52.

[0069] In this embodiment, the filter 8 is configured as a transformer oil filter and the peripheral side surfaces of the filter 8 are respectively configured to be connected to the tank shell 5 and the isolation plate 9, the upper end surface of the filter 8 is respectively configured to be distributed corresponding to the second liquid level sensor 6 and the third liquid level sensor 7, and the lower end surface of the filter 8 is configured to be distributed corresponding to the third valve 3.

[0070] Through the filter 8, supporting connection points for the third valve 3, the tank shell 5, the second liquid level sensor 6, the third liquid level sensor 7 and the isolation plate 9 are formed. The filter 8 realizes connection with the third valve 3, connection with the tank shell 5, connection with the second liquid level sensor 6, connection with the third liquid level sensor 7 and connection with the isolation plate 9. The technical purpose is to be used as a component for filtering and defoaming the oil sample return liquid.

[0071] In this embodiment, the isolation plate 9 is configured as a sheet-shaped body and the bottom end face of the isolation plate 9 and the front and rear side faces of the isolation plate 9 are respectively configured to be connected to the tank shell 5, the top end face of the isolation plate 9 is configured to have a gap with the inner wall of the tank shell 5 and the lower side of the right end face of the isolation plate 9 is configured to be connected to the filter 8.

[0072] The isolation plate 9 forms a supporting connection point for the tank shell 5 and the filter 8. The isolation plate 9 realizes connection with the tank shell 5 and the filter 8. The technical purpose is to be used as a component for partitioning the tank shell 5 to obtain the left chamber body 51 and the right chamber body 52.

[0073] In this embodiment, the ratio of the distance L2 between the center line of the third liquid level sensor 7 and the center line of the filter 8 to the distance L1 between the second liquid level sensor 6 and the center line of the filter 8 is set to 1:2.2-4.2.

[0074] The technical purpose is to achieve that the second liquid level sensor 6 and the third liquid level sensor 7 respond in different time periods.

[0075] In this embodiment, the tank shell 5, the first valve 1, the second valve 2, the third valve 3, the isolation plate 9 and the filter 8 are arranged to be distributed in a filtering and defoaming manner, and the tank shell 5, the first valve 1, the second valve 2, the third valve 3, the isolation plate 9 and the filter 8 are arranged to be distributed in a bubble state monitoring manner, the center line of the tank shell 5, the center line of the first valve 1 and the center line of the isolation plate 9 are arranged on the same straight line, and at least one filter 8 is arranged between the isolation plate 9 and the tank shell 5.

[0076] The present invention is further described below in conjunction with examples. The following examples are intended to illustrate the present invention rather than to further limit the present invention.

[0077] A method for eliminating bubbles in oil sample return oil liquid for online monitoring of gas in transformer oil, one of the first embodiments of the present invention, the steps are: when using the online monitoring device for gas in transformer oil to monitor the dissolved gas in the oil sample online, the first valve 1 and the second valve 2 are in a closed state, the third valve 3 is in an open state, the transformer oil in the transformer oil storage cabinet is refluxed into the left chamber body 51 and the right chamber body 52 under the pumping action of the pump body, when the transformer oil in the left chamber body 51 and the right chamber body 52 is in a full state, the first valve 1 is closed, the third valve 3 is opened, and the transformer oil in the transformer oil storage cabinet is refluxed into the left chamber body 51 and the right chamber body 52. The left chamber body 51 and the right chamber body 52 are in the open state, so that the air in the left chamber body 51 and the right chamber body 52 is released, and the left chamber body 51 and the right chamber body 52 are emptied. After the left chamber body 51 and the right chamber body 52 are emptied, the first valve 1 is in the closed state, and the pump body is closed to pump the transformer oil in the left chamber body 51 and the right chamber body 52 back to the transformer oil storage cabinet, so that the left chamber body 51 and the right chamber body 52 maintain the same pressure state as the transformer oil storage cabinet, and the third valve 3 is in the closed state, so that the left chamber body 51 and the right chamber body 52 are initialized. After the initialization processing of the left chamber body 51 and the right chamber body 52 is completed, the oil sample is injected into the online gas monitoring device in the transformer oil, and the online gas monitoring device in the transformer oil performs dissolved gas detection on the oil sample. After the dissolved gas detection on the oil sample is completed, the second valve 2 and the third valve 3 are opened, and the oil sample return oil liquid is injected into the left chamber body 51 through the second valve 2. In the left chamber body 51, bubbles of the oil sample return oil liquid are precipitated and rise to the top of the tank shell 5. The precipitated oil sample return oil liquid flows into the right chamber body 52. ​​When the precipitated oil sample return oil liquid flows to the transformer oil storage cabinet through the filter 8 and the third valve 3, the filter 8 eliminates the bubbles still existing in the precipitated oil sample return oil liquid. When the oil sample return oil liquid is injected into the left chamber body 51 through the second valve 2, the first liquid level sensor 4 picks up the liquid level signal of the oil sample return oil liquid in the left chamber body 51. When the precipitated oil sample return oil liquid flows into the right chamber body 52, the second liquid level sensor 6 and the third liquid level sensor 7 pick up the liquid level signal of the precipitated oil sample return oil liquid in the left chamber body 51. The timing starts from the time when the first liquid level sensor 4 picks up the liquid level signal of the oil sample return oil liquid in the left chamber body 51, and ends when the second liquid level sensor 6 picks up the liquid level signal of the precipitated oil sample return oil liquid in the left chamber body 51. The filling time T of the precipitated oil sample return oil liquid to the filter 8 is obtained. When the third liquid level sensor 7 does not pick up the liquid level signal of the precipitated oil sample return oil liquid in the left chamber body 51 or the third liquid level sensor 7 does not pick up the liquid level signal of the precipitated oil sample return oil liquid in the left chamber body 51, the time T is obtained. When the liquid level signal of the precipitated oil sample return liquid in the left chamber body 51 is picked up and the filling time T is less than the specified minimum time value and the filling time T is greater than the specified maximum time value, a signal is input to the second valve 2 and the third valve 3, so that the second valve 2 and the third valve 3 are in a closed state, and it is necessary to manually eliminate bubbles from the oil sample return liquid in the left chamber body 51 and the right chamber body 52. ​​When the third liquid level sensor 7 picks up the liquid level signal of the precipitated oil sample return liquid in the left chamber body 51 and the filling time T is between the specified minimum time value and the specified maximum time value, the oil sample return liquid is in a normal state and refluxes to the transformer oil storage cabinet. When the reflux to the transformer oil storage cabinet is completed, the second valve 2 and the third valve 3 are in a closed state.

[0078] In the present embodiment, the prescribed minimum time value of the refilling time T is set to 5 minutes and the prescribed maximum time value of the refilling time T is set to 1440 minutes.

[0079] An oil sample return liquid bubble elimination device for online monitoring of gas in transformer oil. Figure 1 This is the third embodiment of the first embodiment of the present invention, which is specifically described in conjunction with the accompanying drawings. It includes a PLC controller and the interfaces of the PLC controller are respectively configured to be connected to the control port of the first valve 1, the control port of the second valve 2, the control port of the third valve 3, the output interface of the first liquid level sensor 4, the output interface of the second liquid level sensor 6 and the output interface of the third liquid level sensor 7.

[0080] Through the PLC controller, supporting connection points for the first valve 1, the second valve 2, the third valve 3, the first liquid level sensor 4, the second liquid level sensor 6 and the third liquid level sensor 7 are formed. The PLC controller realizes the connection with the first valve 1, the connection with the second valve 2, the connection with the third valve 3, the connection with the first liquid level sensor 4, the connection with the second liquid level sensor 6, and the connection with the third liquid level sensor 7. The technical purpose is to serve as a component for controlling the working states of the first valve 1, the second valve 2 and the third valve 3, and to serve as a component for processing the signals of the first liquid level sensor 4, the second liquid level sensor 6 and the third liquid level sensor 7.

[0081] A method for eliminating bubbles in oil sample return liquid for online monitoring of gas in transformer oil, the third embodiment of the first embodiment of the present invention, the steps are: when a PLC controller receives input signals from a first liquid level sensor 4, a second liquid level sensor 6 and a third liquid level sensor 7, the input signals from the first liquid level sensor 4, the second liquid level sensor 6 and the third liquid level sensor 7 are processed and a filling time T is obtained; when the PLC controller inputs signals to a control port of a first valve 1, a control port of a second valve 2 and a control port of a third valve 3, the working states of the first valve 1, the second valve 2 and the third valve 3 are controlled.

[0082] When verifying the present invention, the inventor abandoned the existing technical features of manually observing the oil sample return oil bubble status through a transparent pipe and discharging the oil sample return oil liquid with bubbles through a branch pipe. First, a technical feature of removing the bubbles in the oil sample return oil liquid while it is in a flowing state was proposed, and the first unexpected technical effect was obtained: the bubble-free oil sample return oil liquid was refluxed under the same pressure state as the transformer oil storage cabinet, thereby preventing interference factors to the transformer and improving the reliability of the transformer. The second unexpected technical effect was obtained: the oil sample return oil liquid was defoamed in the sealed interval, thereby improving the flow performance of the oil sample return oil liquid between the online monitoring of gas in the transformer oil and the transformer oil storage cabinet. The third unexpected technical effect was obtained: the tank shell 5 and the isolation plate 9 formed a tortuous flow channel for releasing bubbles from the oil sample return oil liquid, thereby improving the bubble precipitation effect of the oil sample return oil liquid. The fourth unexpected technical effect was obtained: the filter 8 was used to block and crush the bubbles in the oil sample return oil liquid, thereby removing the bubbles in the oil sample return oil liquid. Redistribution is carried out, which improves the bubble elimination effect of the oil sample return liquid, and obtains the fourth unexpected technical effect: the first valve 1, the second valve 2 and the third valve 3 are used to adjust the pressure state of the left chamber body 51 and the right chamber body 52, maintain the consistency of the pressure state of the left chamber body 51, the right chamber body 52 and the transformer oil storage cabinet, eliminate the factors affecting the transformer oil, and obtain the fifth unexpected technical effect: the first liquid level sensor 4, the second liquid level sensor 6 and the third liquid level sensor 7 are used to pick up the liquid level signals in the left chamber body 51 and the right chamber body 52, and the bubble distribution state in the oil sample return liquid is monitored online, and the bubble signal in the oil sample return liquid is monitored online, and the sixth unexpected technical effect is obtained: the specified minimum time value and the specified maximum time value of the filling time T are optimally determined by proportion, corresponding to the viscosity of the transformer oil, and the scope of use of the device is expanded, and the sixth unexpected technical effect is obtained: the automatic control of the bubble elimination process by the PLC controller is realized, and the efficiency of eliminating bubbles in the oil sample return liquid is improved.

[0083] In the second embodiment of the present invention, the housing assembly, the first valve 1, the second valve 2 and the filter 8 are interconnected in such a manner that the bubbles in the oil sample return fluid are removed while in a flowing state.

[0084] In this embodiment, the filter 8 is connected to the housing assembly, the first valve 1 and the second valve 2 in such a manner as to perform a bubble blocking and crushing process.

[0085] In this embodiment, the tank shell assembly is configured to include a tank shell 5 and an isolation plate 9 .

[0086] In this embodiment, a first accessory device is further included and is arranged on the tank shell assembly. The first accessory device is arranged as a third valve 3 .

[0087] In this embodiment, a second accessory device is further included and is arranged on the tank shell assembly. The second accessory device is arranged to include a first liquid level sensor 4 , a second liquid level sensor 6 and a third liquid level sensor 7 .

[0088] The second embodiment of the present invention is based on the first embodiment. The second embodiment of the present invention comprises the following steps: the box shell assembly is used to separate out the rising bubbles of the oil sample return liquid; the first valve 1 and the second valve 2 are used to place the box shell assembly and the transformer oil storage cabinet in a unified pressure state; the filter 8 is used to block and break the bubbles of the separated oil sample return liquid, thereby removing the bubbles in the oil sample return liquid while it is in a flowing state.

[0089] The second embodiment of the present invention is based on the first embodiment.

[0090] The present invention has the following characteristics: 1. Due to the design of the box shell assembly, the first valve 1, the second valve 2 and the filter 8, the box shell assembly is used to realize the precipitation of the upwelling bubbles of the oil sample return oil liquid, the first valve 1 and the second valve 2 are used to realize the treatment of the box shell assembly and the transformer oil storage cabinet in a unified pressure state, the filter 8 is used to realize the bubble blocking and crushing treatment of the precipitated oil sample return oil liquid, and the bubbles in the oil sample return oil liquid are removed in a flowing state, which solves the technical problem of manually observing the oil sample return oil bubble status through a transparent pipe and discharging the oil sample return oil liquid with bubbles through a branch pipe, thereby improving the effect of eliminating the bubbles in the oil sample return oil liquid.

[0091] 2. Due to the design of the tank shell 5 and the isolation plate 9, an inverted U-shaped flow channel is obtained in the tank body.

[0092] 3. Due to the design of the third valve 3, the on-off control with the transformer oil storage cabinet is realized.

[0093] 4. Due to the design of the first liquid level sensor 4, the second liquid level sensor 6 and the third liquid level sensor 7, online monitoring of the bubble status in the oil sample return fluid is achieved.

[0094] 5. Since the design limits the numerical range of the structural shape, the numerical range is the technical feature in the technical solution of the present invention, rather than a technical feature calculated by a formula or obtained through a limited number of tests. Tests have shown that the technical feature of this numerical range has achieved good technical effects.

[0095] 6. Due to the design of the technical features of the present invention, the effects of the individual and combined technical features have been shown through experiments to have various performance indicators of the present invention that are at least 1.7 times the existing performance indicators, and have been evaluated to have good market value.

[0096] There are other technical features that are connected to the box shell assembly, the first valve 1, the second valve 2 and the filter 8 so that the bubbles in the oil sample return liquid can be removed in a flowing state, which are all one of the embodiments of the present invention, and the technical features of the above-mentioned embodiments can be combined arbitrarily. In order to meet the requirements of the Patent Law, the Patent Implementation Rules and the Examination Guidelines, all possible combinations of the technical features in the above-mentioned embodiments will no longer be described.

[0097] The above embodiment is only one implementation form of the oil sample return liquid bubble elimination device and method for online monitoring of gas in transformer oil provided by the present invention. Other variations of the scheme provided by the present invention, adding or reducing the features or steps therein, or applying the present invention to other technical fields close to the present invention, all belong to the protection scope of the present invention.

Claims

1. An oil sample return liquid bubble elimination device for online monitoring of gas in transformer oil, characterized by: The invention comprises a box shell component having an inverted U-shaped flow channel, a first valve (1) arranged at the top of the inverted U-shaped flow channel of the box shell component, a second valve (2) arranged at one of the ports of the inverted U-shaped flow channel of the box shell component, and a filter (8) arranged at another port of the inverted U-shaped flow channel of the box shell component.

2. The oil sample return liquid bubble elimination device for online monitoring of gas in transformer oil according to claim 1 is characterized in that: The housing assembly, the first valve (1), the second valve (2) and the filter (8) are connected to each other in such a way that bubbles in the oil sample return fluid are removed while in a flowing state.

3. The oil sample return liquid bubble elimination device for online monitoring of gas in transformer oil according to claim 2 is characterized in that: The filter (8) is connected to the housing assembly, the first valve (1) and the second valve (2) in a manner to perform a bubble blocking and crushing process.

4. The oil sample return liquid bubble elimination device for online monitoring of gas in transformer oil according to claim 1 is characterized in that: The tank shell assembly is configured to include a tank shell (5) and an isolation plate (9). Or, it further comprises a first accessory device and the first accessory device is arranged on the housing assembly, and the first accessory device is arranged as a third valve (3), Or, it further comprises a second accessory device and the second accessory device is arranged on the tank shell assembly, and the second accessory device is arranged to comprise a first liquid level sensor (4), a second liquid level sensor (6) and a third liquid level sensor (7).

5. The oil sample return liquid bubble elimination device for online monitoring of gas in transformer oil according to claim 4 is characterized in that: A first valve (1), a second valve (2), a third valve (3), a first liquid level sensor (4), a second liquid level sensor (6) and a third liquid level sensor (7) are respectively arranged on the tank shell (5); an isolation plate (9) is arranged in the tank shell (5) and a filter (8) is arranged between the isolation plate (9) and the tank shell (5); the filter (8) is arranged to be distributed correspondingly to the third valve (3) and the third liquid level sensor (7).

6. The oil sample return liquid bubble elimination device for online monitoring of gas in transformer oil according to claim 5 is characterized in that: The first valve (1) is configured as a solenoid valve and the inner end port of the first valve (1) is configured to be connected in a communication manner with the tank shell (5), and the outer end port of the first valve (1) is configured to be connected in a communication manner with the atmospheric environment. Or, the second valve (2) is configured as a solenoid valve and the inner end port of the second valve (2) is configured to be connected in a communication manner with the tank shell (5), and the outer end port of the second valve (2) is configured to be connected in a communication manner with an output port of an online monitoring device for gas in transformer oil, Or, the filter (8) is configured as a transformer oil filter and the peripheral side surfaces of the filter (8) are respectively configured to be connected to the tank shell (5) and the isolation plate (9), the upper end surface of the filter (8) is respectively configured to be distributed correspondingly to the second liquid level sensor (6) and the third liquid level sensor (7), and the lower end surface of the filter (8) is configured to be distributed correspondingly to the third valve (3), Or, the tank shell (5) is configured as a vertical tank-shaped body and the middle of the bottom wall of the tank shell (5) is configured to be connected to the isolation plate (9), the middle of the top wall of the tank shell (5) is configured to be connected in a communication manner with the first valve (1) and the left side of the top wall of the tank shell (5) is configured to be connected in a communication manner with the first liquid level sensor (4), the lower side of the left wall of the tank shell (5) is configured to be connected in a communication manner with the second valve (2) and the upper side of the right wall of the tank shell (5) is configured to be connected in a communication manner with the second liquid level sensor (6), the middle of the right wall of the tank shell (5) is configured to be connected in a communication manner with the third liquid level sensor (7) and the lower end of the middle of the right wall of the tank shell (5) is configured to be connected to the filter (8), and the lower side of the right wall of the tank shell (5) is configured to be connected in a communication manner with the third valve (3), Alternatively, a left chamber body (51) is formed between the left wall of the tank shell (5) and the isolation plate (9), and a right chamber body (52) is formed between the right wall of the tank shell (5) and the isolation plate (9), the left chamber body (51) is respectively arranged to correspond to the second valve (2) and the first liquid level sensor (4), and the right chamber body (52) is respectively arranged to correspond to the liquid level sensor (6), the third liquid level sensor (7), the filter (8) and the third valve (3), Alternatively, the isolation plate (9) is configured as a sheet-like body and the bottom end surface of the isolation plate (9) and the front and rear side surfaces of the isolation plate (9) are respectively configured to be connected to the tank shell (5), the top end surface of the isolation plate (9) is configured to be spaced from the inner wall of the tank shell (5) and the lower side of the right end surface of the isolation plate (9) is configured to be connected to the filter (8), Or, the third valve (3) is configured as a solenoid valve and the inner end port of the third valve (3) is configured to be connected in a communication manner with the tank shell (5), and the outer end port of the third valve (3) is configured to be connected in a communication manner with the transformer oil storage cabinet, Or, the first liquid level sensor (4) is configured as a contact type liquid level sensor and the touch portion of the first liquid level sensor (4) is configured to be communicatively connected to the tank shell (5), and the housing of the first liquid level sensor (4) is configured to be connected to the tank shell (5). Or, the second liquid level sensor (6) and the third liquid level sensor (7) are configured as contact-type liquid level sensors, and the touch portion of the second liquid level sensor (6) and the touch portion of the third liquid level sensor (7) are respectively configured to be communicatively connected to the tank shell (5), and the housing of the second liquid level sensor (6) and the housing of the third liquid level sensor (7) are respectively configured to be connected to the tank shell (5), Alternatively, the ratio of the distance L2 between the center line of the third liquid level sensor (7) and the center line of the filter (8) to the distance L1 between the center line of the second liquid level sensor (6) and the filter (8) is set to 1:2.2-4.

2.

7. The oil sample return liquid bubble elimination device for online monitoring of gas in transformer oil according to any one of claims 1 to 6, characterized in that: The tank shell (5), the first valve (1), the second valve (2), the third valve (3), the isolation plate (9), and the filter (8) are arranged in a manner of filtering and defoaming, and the tank shell (5), the first valve (1), the second valve (2), the third valve (3), the isolation plate (9), and the filter (8) are arranged in a manner of monitoring the state of bubbles, and the center line of the tank shell (5), the center line of the first valve (1), and the center line of the isolation plate (9) are arranged on the same straight line. Alternatively, at least one filter (8) is disposed between the separating plate (9) and the tank shell (5).

8. The oil sample return liquid bubble elimination device for online monitoring of gas in transformer oil according to claim 5 is characterized by: A PLC controller is included, and the interfaces of the PLC controller are respectively arranged to be connected to the control port of the first valve (1), the control port of the second valve (2), the control port of the third valve (3), the output interface of the first liquid level sensor (4), the output interface of the second liquid level sensor (6) and the output interface of the third liquid level sensor (7).

9. A method for eliminating bubbles in oil sample return fluid for online monitoring of gas in transformer oil, characterized in that the steps are: The box shell component enables the upward bubbles to be precipitated from the oil sample return liquid, the first valve (1) and the second valve (2) enable the box shell component and the transformer oil storage cabinet to be placed in a unified pressure state, the filter (8) enables the bubbles to be blocked and crushed from the precipitated oil sample return liquid, and the bubbles in the oil sample return liquid are removed while in a flowing state.

10. The method for eliminating bubbles in oil sample return fluid for online monitoring of gas in transformer oil according to claim 9, characterized in that the steps are: When the online monitoring device for gas in transformer oil is used to monitor dissolved gas in the oil sample online, the first valve (1) and the second valve (2) are in a closed state, and the third valve (3) is in an open state, so that the transformer oil in the transformer oil storage cabinet is refluxed into the left chamber (51) and the right chamber (52) under the pumping action of the pump body. When the transformer oil in the left chamber (51) and the right chamber (52) is in a full state, the first valve (1) is in an open state, so that the air in the left chamber (51) and the right chamber (52) is released, and the left chamber (51) and the right chamber (52) are emptied. When the left chamber (51) and the right chamber (52) are emptied, the transformer oil in the left chamber (51) and the right chamber (52) are emptied. After the left chamber (51) and the right chamber (52) are emptied, the first valve (1) is closed, the pump body is turned off to pump the transformer oil in the left chamber (51) and the right chamber (52) back into the transformer oil storage cabinet, the left chamber (51) and the right chamber (52) are kept at the same pressure as the transformer oil storage cabinet, the third valve (3) is closed, and the left chamber (51) and the right chamber (52) are initialized. After the initialization of the left chamber (51) and the right chamber (52) is completed, the oil sample is injected into the transformer oil gas online monitoring device, and the transformer oil gas online monitoring device is used to monitor the transformer oil gas. The device performs dissolved gas detection on the oil sample. After the dissolved gas detection on the oil sample is completed, the second valve (2) and the third valve (3) are opened, and the oil sample return oil liquid is injected into the left chamber body (51) through the second valve (2). In the left chamber body (51), bubbles of the oil sample return oil liquid are precipitated and rise to the top of the tank shell (5). The precipitated oil sample return oil liquid flows into the right chamber body (52). When the precipitated oil sample return oil liquid flows to the transformer oil storage cabinet through the filter (8) and the third valve (3), the filter (8) eliminates the bubbles still existing in the precipitated oil sample return oil liquid. When the oil sample return oil liquid is injected into the left chamber body (51) through the second valve (2), the bubbles are removed by the filter (8). When the oil sample returns to the left chamber (51), the first liquid level sensor (4) picks up the liquid level signal of the oil sample return liquid in the left chamber (51). When the precipitated oil sample return liquid flows into the right chamber (52), the second liquid level sensor (6) and the third liquid level sensor (7) pick up the liquid level signal of the precipitated oil sample return liquid in the left chamber (51). The timing starts from the time when the first liquid level sensor (4) picks up the liquid level signal of the oil sample return liquid in the left chamber (51) and ends when the second liquid level sensor (6) picks up the liquid level signal of the precipitated oil sample return liquid in the left chamber (51). The filling time T of the precipitated oil sample return liquid to the filter (8) is obtained.When the third liquid level sensor (7) does not pick up the liquid level signal of the precipitated oil sample return oil liquid in the left chamber body (51) or the third liquid level sensor (7) picks up the liquid level signal of the precipitated oil sample return oil liquid in the left chamber body (51) and the filling time T is less than the specified minimum time value and the filling time T is greater than the specified maximum time value, a signal is input to the second valve (2) and the third valve (3) so that the second valve (2) and the third valve (3) are in a closed state, and it is necessary to manually eliminate bubbles from the oil sample return oil liquid in the left chamber body (51) and the right chamber body (52). When the third liquid level sensor (7) picks up the liquid level signal of the precipitated oil sample return oil liquid in the left chamber body (51) and the filling time T is between the specified minimum time value and the specified maximum time value, the oil sample return oil liquid is in a normal state and refluxes to the transformer oil storage cabinet. When the reflux to the transformer oil storage cabinet is completed, the second valve (2) and the third valve (3) are in a closed state. Or, the prescribed minimum time value of the refilling time T is set to 5 minutes and the prescribed maximum time value of the refilling time T is set to 1440 minutes, Or, the steps are: When the PLC controller receives input signals from the first liquid level sensor (4), the second liquid level sensor (6) and the third liquid level sensor (7), the input signals from the first liquid level sensor (4), the second liquid level sensor (6) and the third liquid level sensor (7) are processed and a filling time T is obtained. When the PLC controller inputs signals to the control port of the first valve (1), the control port of the second valve (2) and the control port of the third valve (3), the working states of the first valve (1), the second valve (2) and the third valve (3) are controlled.

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