CN216956034U - Insulating oil detector - Google Patents

Abstract

The utility model discloses an insulating oil detector, relates to the technical field of electrical equipment, and aims to provide an insulating oil detection device convenient for obtaining a sample. The insulating oil detector comprises a detection system, wherein the detection system comprises an oil inlet pipeline, a flowmeter, a detection tank, a vacuum pump and a vacuum gauge. The oil inlet pipeline is used for being connected with a circulation pipeline of the insulating oil in series, and one end of the flowmeter is communicated with one end of the oil inlet pipeline and used for detecting the flow of the insulating oil flowing through the flowmeter and outputting flow parameters. The detection tank is communicated with the oil inlet pipeline in parallel, and the vacuum pump is communicated with the detection tank. The vacuum gauge is provided with a sensing end, the sensing end is positioned in the detection tank, and the vacuum gauge is used for detecting the air pressure in the detection tank and outputting negative pressure parameters. The application provides an insulating oil detector is with measuring dissolved gas concentration in the insulating oil.

Description

Insulating oil detector

Technical Field

The application relates to the technical field of power equipment, in particular to an insulating oil detector.

Background

Oil-immersed (i.e., insulating oil) type transformers are commonly used in domestic and foreign high-voltage and large-capacity power transformers, and when internal faults occur in the transformers, the insulating oil usually contains fault gases such as hydrogen, carbon monoxide, methane, acetylene, ethylene and the like. Therefore, fault analysis and life prediction can be carried out on the oil-immersed transformer by detecting the gas concentration in the insulating oil. And when equipment such as an oil-immersed transformer is installed, oil quality data of the insulating oil during oil filtering, vacuum oil injection or hot oil circulation is recorded by detecting the concentration of gas dissolved in the insulating oil.

However, during the oil filtering, vacuum oil filling or hot oil circulation flowing process of the insulating oil, the insulating oil is kept in a closed container and a pipeline in an isolated way. Therefore, when the concentration of the gas dissolved in the insulating oil is detected, a sampling hole needs to be formed in a closed container or a pipeline for obtaining an insulating oil sample, and after the sample is obtained, the insulating oil sample needs to be isolated, stored and inspected, so that the operation is complex.

SUMMERY OF THE UTILITY MODEL

The utility model provides an insulating oil detector, and aims to provide an insulating oil detection device which is convenient for obtaining and detecting samples.

In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions:

some embodiments of the present application provide an insulating oil detector, including detecting system, this detecting system is including advancing oil pipe way, flowmeter, detection jar, vacuum pump and vacuometer. The oil inlet pipeline is used for being connected with a flow pipeline of the insulating oil in series, one end of the flowmeter is communicated with one end of the oil inlet pipeline, and the flow pipeline is used for detecting the flow of the insulating oil flowing through the flowmeter and outputting flow parameters. The detection tank is communicated with the oil inlet pipeline in parallel, and the vacuum pump is communicated with the detection tank. The vacuum gauge is provided with a sensing end, the sensing end is positioned in the detection tank, and the vacuum gauge is used for detecting the air pressure in the detection tank and outputting negative pressure parameters.

Therefore, the flowmeter and the oil inlet pipeline can be connected in series with the insulating oil circulation pipeline and used for oil filtering, vacuum oil filling or hot oil circulation of the insulating oil. So, insulating oil advances oil pipe way and flowmeter's in-process at the flow process, can detect and acquire the volume of insulating oil or the flow parameter of quality through the flowmeter to, through the detection jar parallelly connected with advancing oil pipe way, can directly acquire the insulating oil sample that is used for detecting, need not extra sample and preserve, it is very convenient.

In the process of detecting the gas concentration in the insulating oil by using a gasometer of the insulating oil: the second oil inlet of the detection tank is plugged at first, gas in the detection tank is extracted through a vacuum pump communicated with the second oil outlet, so that the interior of the detection tank is in a negative pressure state or even close to a vacuum state, and a first negative pressure parameter p1 in the detection tank at the moment is obtained through a vacuum gauge. And then, the insulating oil flowing through the oil inlet pipeline is guided into the detection tank through the second oil inlet, the guiding volume of the insulating oil is controlled to be V1, the insulating oil can conveniently enter the detection tank through the second oil inlet due to the fact that the detection tank is in a negative pressure state, separation of gas dissolved in the insulating oil and the insulating oil is facilitated, and a second negative pressure parameter p2 in the detection tank at the moment is obtained through a vacuum gauge.

Based on the two negative pressure parameters p1 and p2, the volume of the insulation oil conveyed into the detection tank is V1, and the volume of the detection tank is V2, which are known quantities. Thus, according to the formula:

the volume concentration of the gas dissolved in the insulating oil can be directly calculated. Where R is the molar gas constant and Vm is the gas molar volume, both of which are known constants. And T1 is ambient temperature, which can be directly obtained or measured, and is the value in degrees celsius plus 273.15.

So, insulating oil detector that this application embodiment provided only needs to use through the cooperation of vacuum pump with the vacuometer, can measure twice negative pressure parameter around receiving insulating oil in the detection tank. According to the formula, the known constant and the ambient temperature, the volume concentration of the gas dissolved in the insulating oil can be calculated. Compared with the prior art, the scheme does not need to use carrier gas and other consumable articles, is beneficial to the continuous use of the detector in the process of detecting the volume concentration of the gas dissolved in the insulating oil, and has lower detection and use cost.

In some embodiments, the detection system further comprises an oil pump and a first check valve, and the oil pump and the first check valve are arranged between the detection tank and the oil inlet pipeline. The detection tank is provided with a second oil outlet, and the oil pump is provided with a third oil inlet and a third oil outlet. And a third oil inlet is communicated with a second oil outlet, the inlet end of the first one-way valve is communicated with the third oil outlet, and the outlet end of the first one-way valve is communicated with an oil inlet pipeline. So, can detect the insulating oil pressurization in the jar through the oil pump and arrange to advancing in the oil pipe way, and the setting of check valve can avoid insulating oil to be inhaled backward in the detection jar.

In some embodiments, the detection system further comprises a buffer tank disposed between the detection tank and the oil pump. The buffer tank is provided with a fourth oil inlet, a fourth oil outlet and a gas outlet, the fourth oil inlet is communicated with the second oil outlet, the fourth oil outlet is communicated with the third oil inlet, and the gas outlet is communicated with the vacuum pump. Through the setting of buffer tank, when making things convenient for insulating oil to discharge through the fourth oil-out, keep away from the fourth oil inlet through setting up the fourth oil-out, and make the gas outlet be close to the fourth oil inlet, can also avoid insulating oil to flow into the vacuum pump.

In some embodiments, the detection system further comprises an oil pump and a one-way valve. The oil pump is provided with a third oil inlet and a third oil outlet, and the third oil inlet is communicated with the second oil outlet. And the one-way valve is communicated with the third oil outlet.

In some embodiments, the detection system further comprises a first valve and a second valve. The first valve is arranged between the oil inlet pipeline and the detection tank, and the second valve is arranged between the detection tank and the buffer tank. Therefore, the opening and closing of the detection tank are convenient to control by controlling the opening or closing of the first valve and the second valve.

In some embodiments, the detection system further comprises a particle size detector, which is in parallel communication with the oil inlet pipeline and is used for detecting the concentration of solid particles in the insulating oil and outputting a particle size parameter.

In some embodiments, the flow meter is a mass flow meter. The flow of the insulating oil can be accurately measured.

In some embodiments, the insulating oil meter further comprises a control system comprising a data processing unit and a display unit. The data processing unit is respectively connected with the vacuum gauge and the flowmeter, receives the negative pressure parameter and the flow parameter, and outputs and stores processing data. The display unit is connected with the data processing unit and receives and displays the processed data. Wherein, the processing data comprises the gas content concentration and the flow parameter of the insulating oil. Therefore, the automatic calculation and output of the concentration of the gas content in the insulating oil can be realized through the built-in control system, and the method is very convenient.

In some embodiments, a data processing unit includes a control module and a storage module. The control module is respectively connected with the vacuum gauge and the flowmeter, receives the negative pressure parameter and the flow parameter and outputs processing data. The storage module is connected with the control module, and receives and stores the negative pressure parameter, the flow parameter and the processing data. In the case of a detection system comprising an oil pump, a first valve and a second valve; the first valve and the second valve are electric control valves, and the control module is respectively connected with and controls the opening and closing of the first valve, the second valve, the oil pump and the vacuum pump. Therefore, the control module can realize automatic measurement of the oil quality of the insulating oil through a preset program.

In some embodiments, the control system further comprises a communication unit connected to the control module. The communication unit receives the processing data and remotely transmits the processing data to the background equipment. Through the remote data connection of the communication unit, the background equipment can be remotely connected with the insulating oil detector, and the oil quality state of the insulating oil can be continuously monitored.

In some embodiments, the display unit is a touch screen, connected to the control module, and configured to input preset parameters to the control module. And when the processing data exceeds the preset parameters, the processing data comprises alarm information. The touch screen is convenient for inputting preset parameters such as temperature T1 and the maximum gas content concentration or the maximum water content concentration of the insulating oil to the control module, and alarm prompt information can be received and displayed.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an insulating oil detector provided in an embodiment of the present application;

fig. 2 is a schematic structural view of the detection system shown in fig. 1.

Reference numerals are as follows:

1-a detection system; 11-a flow meter; 111-a first oil inlet; 112-a first oil outlet; 12-oil inlet pipeline; 121-a third valve; 122-a pressure gauge; 123-a second one-way valve; 13-detection tank; 131-a second oil inlet; 132-a second oil outlet; 14-a vacuum pump; 15-a vacuum gauge; 16-an oil pump; 161-third oil inlet; 162-a third oil outlet; 171-a first one-way valve; 172-a first valve; 173-a second valve; 18-a buffer tank; 181-a fourth oil inlet; 182-a fourth oil outlet; 183-air outlet; 19-a particle size detector;

2-a control system; 21-a data processing unit; 211-a control module; 212-a storage module; 22-a display unit; 23-a communication unit;

3-a cabinet body; 31-a first receiving chamber; 32-second accommodation chamber.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it is to be understood that the terms "upper", "lower", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and operate, and thus, should not be construed as limiting the present application.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.

In the description of the present application, it should be noted that the terms "mounted," "connected," and "in communication with" are to be construed broadly and, for example, may be fixedly connected, detachably connected, or integrally connected unless otherwise specifically stated or limited. The two elements may be connected directly or indirectly through an intermediate medium, or may be connected through an internal connection or an electrical connection between the two elements for transmitting signals. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In the embodiments of the present application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

In the embodiments of the present application, words such as "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.

As shown in fig. 1, an insulating oil detector according to an embodiment of the present application includes a detection system 1, a control system 2, and a cabinet 3. The cabinet 3 has two separated accommodating chambers, namely a first accommodating chamber 31 and a second accommodating chamber 32. The detection system 1 is located in the first housing chamber 31 and the control system 2 is located in the second housing chamber 32. In this way, the detection system 1 and the control system 2 can be separately protected by the first accommodating cavity 31 and the second accommodating cavity 32 to avoid mutual interference between the two.

In other embodiments, the position may be switched such that the detection system 1 is located in the second receiving chamber 32 and the control system 2 is located in the first receiving chamber 31.

Referring to fig. 2, the detection system 1 includes a flow meter 11. Wherein, the flow meter 11 has a first oil inlet 111 and a first oil outlet 112. In this way, the first oil inlet 111 and the first oil outlet 112 can be respectively communicated with both ends of an insulating oil flow line (not shown in the figure), i.e., the flow meter 11 is communicated in series with the insulating oil flow line. In this manner, during oil filtration, vacuum oil injection, or circulation of hot oil of insulating oil, the insulating oil can flow through the flow meter 11 through the first oil inlet 111 and flow out of the flow meter 11 through the first oil outlet 112. Thereby measuring and acquiring a flow parameter of the volume or mass of the insulating oil flowing through the flow meter 11.

In the process, the insulating oil is conveniently sampled so as to detect the oil quality information of the insulating oil. As shown in fig. 2, the detection system 1 further includes an oil inlet line 12. Illustratively, in the flow direction of the insulating oil (the direction of the arrow in the drawing), the insulating oil flows through the communicating oil feed line 12 and the flow meter 11 in this order. That is, one end of the oil inlet line 12 is communicated with the first oil inlet 111, and at this time, the oil inlet line 12 may be also communicated in series with a circulation line of the insulating oil.

In other embodiments, when the flow meter 11 and the oil inlet line 12 are connected in series to the flow line of the insulating oil in sequence, the insulating oil may also flow through the flow meter 11 and the oil inlet line 12 in sequence. That is, either one end of the oil feed line 12 communicates with the first oil outlet 112, or the insulating oil flows in a direction opposite to the arrow direction in the drawing.

Based on the above structure, when the detection system 1 is used for detecting the concentration of the gas in which the insulating oil is dissolved, with continued reference to fig. 2, the detection system 1 further includes a detection tank 13, a vacuum pump 14, and a vacuum gauge 15. The detection tank 13 is opened with a second oil inlet 131 and a second oil outlet 132 which are communicated with the inner space of the detection tank 13. The second oil outlet 132 is in communication with the vacuum pump 14. The vacuum gauge 15 has a sensing end (not shown), and the sensing end is located in the detection tank 13 and is used for detecting the air pressure in the detection tank 13 and outputting a negative pressure parameter. Wherein, the second oil outlet 131 and the second oil inlet 132 are communicated with the oil inlet pipeline 12 in parallel.

Thus, due to the arrangement of the flow meter 11 and the oil inlet pipeline 12, the insulating oil detector can be directly connected in series into a pipeline for filtering, vacuum oil injection or hot oil circulation of the crude oil. So, insulating oil can detect and acquire the volume of insulating oil or the flow parameter of quality at the in-process that advances oil pipe way 12 and flowmeter 11 at the flow through flowmeter 11 to, through the detection jar 13 parallelly connected with advancing oil pipe way 12, can directly acquire the insulating oil sample that is used for detecting, need not extra sample and preserve, it is very convenient.

It should be noted that in some embodiments, the detection tank 13 may have only one opening for receiving the insulating oil, discharging the insulating oil, or performing a negative pressure pumping operation of the vacuum pump in different operation steps. The detection tank 13 may be provided with three openings for receiving the insulating oil, discharging the insulating oil, and performing negative pressure suction operation by the vacuum pump.

In the process of detecting the gas concentration in the insulating oil by using the insulating oil detector, the insulating oil directly flows through the oil inlet pipeline 12. Therefore, the second oil inlet 131 of the detection tank 13 is first blocked, and the communication pipe between the second oil outlet 132 and the oil inlet line 12 is blocked. The gas inside the detection tank 13 is pumped by the vacuum pump 14 communicated with the second oil outlet 132, so that the inside of the detection tank 13 is in a negative pressure state, even close to a vacuum state, and the first negative pressure parameter p1 at this time inside the detection tank 13 is obtained by the vacuum gauge 15. Subsequently, the insulating oil with the volume of V1 is conveyed into the detection tank 13 by opening the second oil inlet 131, and because the interior of the detection tank 13 is in a negative pressure state, the insulating oil conveniently enters the detection tank 13 through the second oil inlet 131, and the separation of the gas dissolved in the insulating oil and the insulating oil is facilitated, after standing for a third preset time, the gas and the insulating oil are sufficiently separated, and a second negative pressure parameter p2 in the detection tank 13 at the moment is acquired through the vacuum gauge 15.

Based on the two negative pressure parameters p1 and p2, the volume of the insulating oil fed into the detection tank 13 is V1, and the volume of the detection tank 13 is V2, which are both known quantities. According to the formula:

the volume concentration of the gas dissolved in the insulating oil can be directly calculated. Where R is the molar gas constant and Vm is the gas molar volume, both of which are known constants. And T1 is ambient temperature, which can be directly obtained or measured, and is the value in degrees celsius plus 273.15.

Therefore, the insulating oil detector provided by the embodiment of the application can detect two times of negative pressure parameters before and after the insulating oil is contained in the detection tank 13 only by using the vacuum pump 14 and the vacuum gauge 15 in a matched manner. According to the formula, the known constant and the ambient temperature, the volume concentration of the gas dissolved in the insulating oil can be calculated. Compared with the prior art, the scheme does not need to use carrier gas and other consumable articles, is beneficial to the continuous use of the insulating oil detector in the process of detecting the volume concentration of the gas dissolved in the insulating oil, and has lower detection and use cost.

The vacuum gauge 15 may be a thin film capacitance gauge, a pirani resistance gauge (thermal resistance vacuum gauge), a thermocouple gauge, a hot cathode ionization gauge, or a cold cathode ionization gauge, and may be used to measure negative pressure parameters. And are not limited herein.

When the negative pressure parameter is measured when the insulating oil is contained in the detection tank 13, the detection tank 13 needs to be left to stand for a certain period of time (i.e., a third preset time) after the insulating oil is supplied. So that the gas dissolved in the insulating oil is sufficiently separated from the insulating oil in the negative pressure environment, and the temperature in the detection tank 13 is kept consistent with the ambient temperature after standing for a certain period of time, all T1.

Among them, in general, a very small amount of water is mixed in the insulating oil. Since moisture has two different states, a gaseous state and a liquid state, the measurement result of the second negative pressure parameter is influenced. Therefore, two different second negative pressure parameters of the moisture in the gas state and the liquid state can be respectively measured by controlling the temperature in the detection tank 13. Thus, the amount of moisture in the insulating oil can be calculated according to the ideal gas state equation, and the concentration of moisture in the insulating oil is obtained, generally, the concentration Per Million (Parts Per Million, ppm for short).

Referring to fig. 1 and 2, since the interior of the detection tank 13 is in a negative pressure state, in order to facilitate discharging the insulating oil, the detection system 1 further includes an oil pump 16 and a first check valve 171 which are sequentially communicated in a flow direction of the insulating oil between the detection tank 13 and the oil inlet pipe 12. The oil pump 16 has a third oil inlet 161 and a third oil outlet 162, the third oil inlet 161 is communicated with the second oil outlet 132, the third oil outlet 162 is communicated with an inlet end of the first check valve 171, and an outlet end of the first check valve 171 is communicated with the oil inlet pipeline 12. Thus, by activating the oil pump 16, the insulating oil in the detection tank 13 can be caused to flow through the oil pump 16 and the first check valve 171 in order, and finally discharged into the oil inlet line 12. Wherein, by providing the first check valve 171, the insulating oil in the oil inlet pipeline 12 can be prevented from flowing into the detection tank 13 through the second oil outlet 132, and the backflow phenomenon of the insulating oil discharged into the oil inlet pipeline 12 can also be prevented.

It should be noted that the first check valve 171 may also be installed near the second oil outlet 132, and the above-mentioned effects can also be achieved.

As shown in fig. 2, the second oil outlet 132 is located below the detection tank 13 as a reference. The vacuum gauge 15 is disposed above the detection tank 13, and the sensing end of the vacuum gauge 15 is inserted into the detection tank 13 through a sealing hole (not shown) formed on the upper side of the detection tank 13, and has a good sealing property with the sealing hole. The induction end positioned above the detection tank 13 can avoid oil stain contamination, so that the oil stain is prevented from influencing the measurement precision of the vacuum gauge 15, and the accuracy of measuring the negative pressure parameter by the vacuum gauge 15 is improved. At this time, the main body portion of the vacuum gauge 15 is located outside the detection tank 13, facilitating acquisition of the negative pressure parameter.

With continued reference to fig. 2, the second oil inlet 131 is disposed on the side wall of the detection tank 13, and the second oil inlet 131 is made to avoid or even be far away from the sensing end of the vacuum gauge 15 in the opening direction of the detection tank 13. Thus, when the insulating oil is conveyed into the detection tank 13 through the second oil inlet 131, the insulating oil can be prevented from being sputtered to the induction end to influence the measurement accuracy of the vacuum gauge 15.

As shown in fig. 2, the second oil outlet 132 is opened below the detection tank 13, and when the insulation oil is contained in the detection tank 13, if the second oil outlet 132 is communicated with the vacuum pump 14, the insulation oil directly flows to the vacuum pump 14 through the second oil outlet 132 and the communication pipeline, so that the normal operation of the vacuum pump 14 is affected. In order to avoid the above problems.

As shown in fig. 1 and 2, the detection system 1 further includes a buffer tank 18 between the detection tank 13 and the oil pump 16. The buffer tank 18 is provided with a fourth oil inlet 181, a fourth oil outlet 182 and an air outlet 183 which are communicated with the inner space. Wherein, the fourth oil inlet 181 is located above the buffer tank 18, and the fourth oil inlet 181 is communicated with the second oil outlet 132. The fourth oil outlet 182 is positioned below the buffer tank 18, so that the insulating oil can directly flow out. And the air outlet 183 is located on a side wall or a top wall of the surge tank 18 and is close to the fourth oil inlet 181. The air outlet 183 is communicated with the vacuum pump 14, so that the vacuum pump 14 is communicated with the second oil outlet 132 through the buffer tank 18. Thus, when the device is used, the air outlet 183 is not located at the lowest position of the buffer tank 18, so that the insulating oil can be discharged conveniently, and meanwhile, the insulating oil can be prevented from flowing into the vacuum pump 14.

As shown in fig. 1 and fig. 2, in order to facilitate controlling the opening and closing of the second oil inlet 131, the detection system 1 further includes a first valve 172 located between the detection tank 13 and the oil inlet pipeline 12, and the first valve 172 is respectively communicated with the second oil inlet 131 and the oil inlet pipeline 12. In this way, it is convenient to control the opening and closing of the second oil inlet 131 to feed insulating oil (i.e., sample) into the inspection tank 13 or to evacuate the inspection tank 13.

It should be noted that, due to the arrangement of the first one-way valve 171, the detection tank 13 can be ensured to have a stable negative pressure state inside the detection tank 13 in cooperation with the first valve 172. Therefore, when carrying insulating oil in detecting jar 13, when closing first valve 172, can make first valve 172 keep away from and be filled with insulating oil in the pipeline that detects jar 13 one end, like this, open first valve 172 after, under the negative pressure effect that detects jar 13, insulating oil directly flows into detecting jar 13 in, can not additionally get into the measuring result that the air disturbed the interior negative pressure of detecting jar 13.

Wherein, for the control of the volume of the insulating oil V1, the transfer amount of the insulating oil can be controlled by controlling the opening time of the first valve 172. This can be calibrated for preliminary testing before use.

With continued reference to fig. 2, the test system 1 further includes a second valve 173 located between the test tank 13 and the buffer tank 18, and the second valve 173 is communicated between the second oil outlet 132 and the fourth oil inlet 181. During evacuation by the vacuum pump 14, the second valve 173 may be opened. After the completion of the operation, the second valve 173 is closed, and the negative pressure data in the inspection tank 13 is measured. At this time, the volume V2 of the detection tank 13 is the volume of the space between the first valve 172 and the second valve 173.

It should be noted that there is no isolation device (e.g., the second valve 173) between the test tank 13 and the buffer tank 18. The volume V2 of the detection tank 13 is the sum of the volumes of both the detection tank 13 and the buffer tank 18.

In some embodiments, as shown in fig. 1 and 2, the detection system 1 further comprises a particle size detector 19 for measuring the degree of contamination of solid particles in the insulating oil. The particle size detector 19 is connected in parallel with the oil inlet pipeline 12, so that the insulating oil flowing through the oil inlet pipeline 12 is sampled and detected to measure the concentration of solid particles in the insulating oil and output particle size parameters. Wherein, the moisture detection module can also be integrated in the granularity detector 19, and the moisture content in the insulating oil can be measured in the same way.

The flow meter 11 may be a mass flow meter or a volume flow meter. However, since it is avoided that the volume change of the insulating oil is caused by expansion with heat and contraction with cold, in the embodiment of the present application, the flow meter 11 is preferably a mass flow meter, so as to obtain stable flow data of the insulating oil.

As shown in fig. 1 and 2, the oil inlet line 12 includes a third valve 121, a pressure gauge 122, and a second check valve 123, which are sequentially connected to each other, in the flow direction of the insulating oil.

As shown in fig. 2, the insulating oil flows upward and downward along the right of the third valve 121 in the flowing direction of the insulating oil. Therefore, the outlet end of the first check valve 171 and the first valve 121 are connected to the upper and lower ends of the third valve 172, respectively. Thus, the communication position of the first check valve 171 with the oil inlet line 12 is located downstream of the communication position of the first valve 172 with the oil inlet line 12, i.e., the insulating oil flowing out of the first check valve 171 does not affect the next sampling of the canister 13. The first valve 172 and the first check valve 171, which communicate with the respective ends of the third valve 121, do not affect the sampling process of the detection tank 13 even when the third valve 121 is closed.

The pressure gauge 122 is arranged to continuously monitor the flow pressure of the oil inlet pipeline 12, even the whole insulating oil filtering, vacuum oil filling or hot oil circulating process, and output the flow pressure parameter, so as to avoid the influence of the overhigh flow pressure on the stability of the insulating oil filtering, vacuum oil filling or hot oil circulating process.

With continued reference to fig. 2, the inlet end of the second one-way valve 123 communicates with the third valve 121, and a pressure gauge 122 is installed between the second one-way valve 123 and the third valve 121. The outlet end of the second check valve 123 is communicated with the first oil inlet 111 of the flow meter 11, thereby preventing the reverse flow of the insulating oil during the filtering, vacuum oiling, or hot oil circulation of the insulating oil.

It should be noted that, on the oil inlet pipeline 12, the third valve 121, the pressure gauge 122 or the second check valve 123 may be installed individually according to the requirement, or may be installed in combination of two. The order of installing the third valve 121, the pressure gauge 122, or the second check valve 123 may be changed as necessary. And is not limited herein.

In addition, the oil inlet pipeline 12 may also be a pipeline, and openings for communicating the granularity detector 19 or the first check valve 171 with the first valve 172 are respectively formed in the pipeline.

In some embodiments, as shown in fig. 1, to facilitate operation of the insulating oil detector, the control system 2 includes a data processing unit 21 and a display unit 22. The data processing unit 21 is connected to the vacuum gauge 15 and the flow meter 11, and can receive the negative pressure parameters (such as p1 and p2) output by the vacuum gauge 15 and the flow parameter output by the flow meter 11. The data processing unit 21 can output and store the processing data according to the built-in program.

The processing data may be gas concentration and mass concentration of moisture, among others. And the gas concentration and the moisture mass concentration can be compared with the preset parameters through the preset parameters, and then the data of normal state or processing such as alarm information and the like are output. And, the process data also includes flow parameters output by the flow meter. In addition, when the data processing unit 21 is connected to the particle size detector 19, the processed data output and stored by the data processing unit 21 further includes the particle size parameter or the moisture content parameter output by the data receiving particle size detector 19.

And the display unit 22 is connected to the data processing unit 21, and the display unit 22 can receive and display the processed data. Therefore, the oil state of the insulating oil and the flow rate of the insulating oil can be directly obtained.

Illustratively, as shown in fig. 1, the data processing unit 21 includes a control module 211 and a storage module 212. The control module 211 is connected to the vacuum gauge 15 and the flow meter 11, and receives the negative pressure parameter and the flow parameter output by the flow meter 11 to output the processing data. The storage module 212 is connected to the control module 211, and receives and stores the flow parameter, the negative pressure parameter, and the processing data. So as to later-stage call detection data, and guarantee authenticity, accuracy and completeness of the detection data.

In the process of receiving the negative pressure parameter and outputting the processing data, the control module 211 calls a preset program and preset parameters through the storage module 212 to calculate the processing data of the volume concentration or the moisture content of the gas dissolved in the insulating oil, and compares the calculation result with the preset parameters to obtain the processing data of the current oil state.

As shown in fig. 1, the first valve 172 and the second valve 173 are both electrically controlled valves. The control module 211 is connected to the vacuum gauge 15, the first valve 172, the second valve 173, the vacuum pump 14, and the oil pump 16 via lines, respectively. When acquiring the negative pressure parameter, the control module 211 outputs a signal to close the first valve 172 and open the second valve 173, and then opens the vacuum pump 14 to evacuate the test tank 13. After the vacuum pump 14 operates for the first preset time, the control module 211 outputs a signal to close the second valve 173, and obtains the first negative pressure parameter p1 output by the vacuum gauge 15 at this time. Then, the control module 211 outputs a signal to open the first valve 172 for a second preset time, and then closes the first valve 172, so that the volume of the insulating oil V1 enters the detection tank 13. After the insulating oil is kept still for the third preset time, the gas dissolved in the insulating oil is sufficiently separated from the insulating oil in the negative pressure environment, and the temperature in the detection tank 13 is the same as the ambient temperature, which is T1, at this time, the control module 211 obtains a second negative pressure parameter p2 output by the vacuum gauge 15. Thus, the control module 211 calls a program in the storage module 212 and calculates the volume concentration of the gas dissolved in the insulating oil (i.e., a kind of processing data) in combination with the negative pressure parameters p1 and p 2.

In the process of acquiring the second negative pressure parameter, the control module 211 may adjust the temperature in the detection tank 13, so that the moisture in the detection tank 13 is in a gas state and a liquid state, respectively, and acquire two different second negative pressure parameters in the two states. For calculating the concentration of water content in the insulating oil.

Finally, the control module 211 outputs a signal to open the second valve 173 and to turn on the oil pump 16 to discharge the liquid in the sensing tank 13 into the oil feed line 12.

Therefore, the insulating oil detector can be used in the processes of insulating oil treatment and filtration, transformer oil injection and transformer hot oil circulation. Only one end of the first valve 172 far away from the detection tank 13 and the outlet end of the first check valve 171 need to be connected in parallel to the insulating oil conveying pipeline through a pipeline, and then the insulating oil in the conveying pipeline can be sampled and detected at regular time, and the processing data (i.e. the detection result) is received and displayed through the display unit 22. The detection process can be automatically performed under the control of the control module 211, and no additional manual operation is needed. Therefore, the oil quality detection speed of the insulating oil can be improved, and the operation efficiency of installation work can be obviously improved in the process of installing the transformer and injecting the insulating oil.

As shown in fig. 1, the third valve 121 may also be an electrically controlled valve, and the control module 211 is connected to the third valve 121. The control module 211 controls the opening or closing of the third valve 121 based on the process data. Illustratively, if the processed data indicates that the oil quality is a contaminated condition, the third valve 121 is controlled to be in a closed state. If the processed data shows that the flow rate of the insulating oil reaches the set flow rate, the third valve 121 is controlled to be in a closed state. In addition, the third valve 121 may also be controlled to be in a closed state, and whether the oil quality state is normal or not may be determined by the measured negative pressure parameter, and if the oil quality state is normal, the third valve 121 may be controlled to be opened.

In addition, referring to fig. 1, the control module 211 is also connected to the pressure gauge 122, and receives the pressure parameter in the pipe output from the pressure gauge 122. And the control module 211 may also retrieve corresponding preset parameters from the storage module 212, compare the preset parameters with the pressure parameters, and determine whether the pressure inside the pipeline is normal. And if the internal pressure of the pipeline exceeds the preset parameter, controlling the third valve 121 to close, and outputting corresponding processing data such as state information, alarm information and the like.

In some embodiments, as shown in fig. 1, the control module 211 is connected to the particle size detector 19 to receive the particle size parameter or the moisture content parameter outputted by the particle size detector 19, and accordingly, determine the oil quality according to the preset parameters, and output the processing data (the particle size parameter or the moisture content parameter and the corresponding oil quality). And the storage module 212 stores the granularity parameter, the moisture content parameter, and the corresponding processing data.

With continued reference to fig. 1, the control system 2 further includes a communication unit 23 connected to the control module 211, and the communication unit 23 can receive the processing data from the control module 211 and remotely transmit the processing data to a background device (not shown).

Illustratively, the insulating oil detector can be used and remotely connected with background equipment through the communication unit 23 during the hot oil circulation process of the transformer. Therefore, during the oil filtering, vacuum oil filling or hot oil circulating process of the insulating oil of the transformer, the oil quality of the insulating oil can be remotely monitored in real time at background equipment of the control center.

As shown in fig. 1, the display unit 22 may be a touch screen (not shown) and is connected to the control module 211. Thus, preset parameters can be input into the control module 211 through the touch screen and stored in the storage module 212, such as the volume concentration of the gas component in the insulating oil (e.g., 0.01-0.07% or 0.2-10%) or the concentration of the moisture in the insulating oil (e.g., 0.7-7 ppm). Thus, when the control module 211 calculates the gas concentration or the moisture concentration, the gas concentration or the moisture concentration is compared with the maximum volume concentration or the maximum moisture concentration of the gas component of the preset parameter. If the calculated concentration is less than the maximum concentration, the oil quality of the insulating oil is in a qualified state in the output data. If the calculated concentration is greater than or equal to the maximum concentration, the output processing data shows that the quality of the insulating oil is in an unqualified state, the processing data comprises alarm information, and the alarm information prompts an operator through the display unit 22 or background equipment.

Illustratively, the alarm message may be a bright alternate flashing reminder via the display unit 22, or may be an alarm prompt tone output via an audible device. The operator can be reminded.

The communication unit 23 may transmit the processing data in a wired manner such as a network cable, an optical fiber, and a telephone line. In addition, wireless transmission can also be carried out through a mobile data network, wireless network communication (namely Wi-Fi) or microwave transmission mode. And is not particularly limited herein. Preset parameters can also be input to the control module 211 through the communication unit 23 by background equipment, or instruction information for controlling the open/close state of the third valve 121.

In some embodiments, the data processing unit 21 including the control module 211 and the storage module 212 may be a unitary structure, i.e., an integrally packaged integrated circuit. The data processing unit 21 may also be a split structure, that is, the control module 211 and the storage module 212 are both single integrated circuits, and the information transmission and control are realized through the circuit board. Illustratively, the data processing unit 21 is a Programmable Logic Controller (PLC).

It should be noted that the temperature T1 of the detection tank 13 can be input into the control module 211 through the touch screen at each measurement. In addition, a temperature sensor (not shown) connected to the control module 211 may be provided at the sensing end of the vacuum gauge 15 for detecting the temperature in the tank 13 in real time.

In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. An insulating oil detector, characterized by, including detecting system, detecting system includes:

the oil inlet pipeline is used for connecting the flow pipelines of the insulating oil in series;

one end of the flow meter is communicated with one end of the oil inlet pipeline; the flow meter is used for detecting the flow of the insulating oil flowing through the flow meter and outputting a flow parameter;

the detection tank is communicated with the oil inlet pipeline in parallel;

the vacuum pump is communicated with the detection tank;

the vacuum gauge is provided with a sensing end, and the sensing end is positioned in the detection tank; the vacuum gauge is used for detecting the air pressure in the detection tank and outputting negative pressure parameters.

2. The insulating oil detector according to claim 1, wherein the detection system further comprises an oil pump and a first check valve; the oil pump and the first one-way valve are arranged between the detection tank and the oil inlet pipeline;

the detection tank is provided with a second oil outlet; the oil pump is provided with a third oil inlet and a third oil outlet; the third oil inlet is communicated with the second oil outlet; the inlet end of the first one-way valve is communicated with the third oil outlet, and the outlet end of the first one-way valve is communicated with the oil inlet pipeline.

3. The insulating oil detector according to claim 2, wherein the detection system further comprises a buffer tank disposed between the detection tank and the oil pump;

the buffer tank is provided with a fourth oil inlet, a fourth oil outlet and an air outlet; the fourth oil inlet is communicated with the second oil outlet, the fourth oil outlet is communicated with the third oil inlet, and the gas outlet is communicated with the vacuum pump.

4. The insulating oil detector of claim 3, wherein the detection system further comprises:

the first valve is arranged between the oil inlet pipeline and the detection tank; and the number of the first and second groups,

the second valve is arranged between the detection tank and the buffer tank.

5. The insulating oil detector according to claim 1, wherein the detection system further comprises a particle size detector, which is in parallel communication with the oil inlet pipeline and is configured to detect the concentration of solid particles in the insulating oil and output a particle size parameter.

6. The insulating oil detector of claim 1, wherein the flow meter is a mass flow meter.

7. The insulating oil detector according to any one of claims 1 to 6, further comprising a control system, the control system comprising:

the data processing unit is respectively connected with the vacuum gauge and the flowmeter; the data processing unit receives the negative pressure parameter and the flow parameter, and outputs and stores processing data; and the number of the first and second groups,

the display unit is connected with the data processing unit; the display unit receives and displays the processing data;

wherein the processing data comprises the gas content concentration and the flow parameter of the insulating oil.

8. The insulating oil detector according to claim 7, wherein the data processing unit comprises:

the control module is respectively connected with the vacuum gauge and the flowmeter; the control module receives the negative pressure parameter and the flow parameter and outputs the processing data; and (c) a second step of,

the storage module is connected with the control module; the storage module receives and stores the negative pressure parameter, the flow parameter and the processing data;

in the case where the detection system comprises an oil pump, a first valve, and a second valve; the first valve and the second valve are both electric control valves; and the control module is respectively connected with and controls the opening and closing of the first valve, the second valve, the oil pump and the vacuum pump.

9. The insulating oil detector according to claim 8, wherein the control system further comprises a communication unit connected to the control module; and the communication unit receives the processing data and remotely transmits the processing data to background equipment.

10. The insulating oil detector according to claim 8, wherein the display unit is a touch screen, is connected to the control module, and is configured to input preset parameters to the control module;

and when the processing data exceeds the preset parameters, the processing data comprises alarm information.

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