CN214224665U

CN214224665U - Transformer analog sampling system

Info

Publication number: CN214224665U
Application number: CN202120136496.0U
Authority: CN
Inventors: 底广辉; 李志成; 闫玉鑫; 李师圆; 胡远翔; 郑朝晖; 王熙俊; 张洪江; 吴华成
Original assignee: State Grid Corp of China SGCC; North China Electric Power Research Institute Co Ltd; State Grid Jibei Electric Power Co Ltd
Current assignee: State Grid Corp of China SGCC; North China Electric Power Research Institute Co Ltd; State Grid Jibei Electric Power Co Ltd
Priority date: 2021-01-19
Filing date: 2021-01-19
Publication date: 2021-09-17
Anticipated expiration: 2031-01-19

Abstract

This specification provides a transformer simulation sampling system, and the sampling system includes: a housing having a first chamber containing oil; the oil supply device is communicated with the first cavity and is used for filling oil into the first cavity; the gas relay is used for storing fault gas and is provided with a first oil outlet which can be opened and closed; the gas supply device is communicated with the gas relay and is used for injecting fault gas into the gas relay; the gas collection device is communicated with the gas relay and used for collecting fault gas, and the gas collection device is provided with a gas collection device which can be switched on and switched off: an air intake port and a second oil outlet; a first flow passage is arranged between the gas relay and the first cavity, an oil taking port capable of being opened and closed and a first switch mechanism are arranged on the first flow passage, a second flow passage is arranged between the gas collecting device and the first cavity, and a second switch mechanism is arranged on the second flow passage. The method and the device can simulate the whole process of field sampling of the transformer in a laboratory, and can ensure the tightness of sampling and the accuracy of sampling results.

Description

Transformer analog sampling system

Technical Field

The application relates to the technical field of transformer equipment maintenance, in particular to a transformer simulation sampling system.

Background

Insulating oil is used and stored in the transformer oil tank for a long time. During normal operation, the insulating oil and the insulating oil paper are decomposed under the action of various factors such as temperature, electric field and catalyst to generate certain characteristic fault gases, and the fault gases are dissolved in the insulating oil, wherein the gases comprise hydrogen, carbon monoxide, methane, ethane, ethylene, acetylene and the like. The gases have certain influence on the safe operation of the transformer, and the change of the content of the characteristic gases dissolved in the oil has close relation with the development degree and the type of the faults inside the equipment. In the operation process of the transformer, the generated different gas contents are monitored in real time, so that faults existing in the transformer can be solved in time, and the stability and the reliability of the operation of the transformer are improved.

In the prior art, when a fault occurs inside a transformer, gas action or gas alarm occurs, and gas decomposed from insulating oil can be collected in a gas collecting box of a gas relay of the transformer. The gas action process is as follows: under the condition of electric arc or overheating, the insulating material is decomposed to generate a large amount of characteristic gas, the characteristic gas flows from the transformer oil tank to the oil conservator, fault gas is collected in the gas relay, and when the fault gas reaches a certain amount, the relay is triggered to send an alarm signal, namely the gas acts. When the transformer has gas action, in order to correctly judge the fault condition in the transformer, sampling is needed in time, off-line detection is realized through oil-gas chromatographic test analysis, the concentration and the variation trend of various fault gases dissolved in insulating oil and in gas are accurately detected, and early warning is effectively carried out on latent faults of the transformer.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem that exists among the prior art, this application provides a transformer simulation sampling system, can be in the overall process of the on-the-spot sample of laboratory simulation transformer to can guarantee the leakproofness and the sampling result accuracy of sample.

In order to achieve the above purpose, the technical solution provided by the present application is as follows:

a transformer analog sampling system, comprising:

a housing having a first chamber containing oil;

the oil supply device is communicated with the first cavity and is used for filling oil into the first cavity;

the gas relay is used for storing fault gas and is provided with a first oil outlet which can be opened and closed;

the gas supply device is communicated with the gas relay and is used for injecting fault gas into the gas relay;

the gas collection device is communicated with the gas relay and used for collecting fault gas, and the gas collection device is provided with a gas collection device which can be switched on and switched off: an air intake port and a second oil outlet;

a first flow passage is arranged between the gas relay and the first cavity, an oil taking port capable of being opened and closed and a first switch mechanism are arranged on the first flow passage, a second flow passage is arranged between the gas collecting device and the first cavity, and a second switch mechanism is arranged on the second flow passage.

As a preferred embodiment, the oil supply device includes: a first branch line disposed on the first flow passage; the first ball valve, the oil inlet pump and the oil tank are arranged on the first branch pipeline, wherein the first cavity is arranged in the direction of oil inlet of the gas relay, and the oil taking port is arranged at the downstream of the first branch pipeline.

In a preferred embodiment, the first and second switching mechanisms are integrated into a first three-way valve, the first three-way valve being disposed between the first and second flow paths, the first three-way valve having a first connection, a second connection, and a third connection, the first and second connections being disposed on the first flow path, and the third connection being disposed on the second flow path.

As a preferred embodiment, the housing further includes a second chamber for supplying pressure, the second chamber is connected to a pressure supply device, a piston mechanism is slidably disposed between the second chamber and the first chamber, and the piston mechanism can press out oil in the first chamber by injecting gas into the second chamber through the pressure supply device.

As a preferred embodiment, the piston mechanism includes: the bearing plate is matched with the inner wall of the shell and divides the first cavity from the second cavity, and a connecting hole is formed in the bearing plate; and the piston rod is of a hollow structure, one end of the piston rod extends out of the shell and is provided with a second ball valve so as to be communicated with the outside through the second ball valve, and the other end of the piston rod is communicated with the first cavity through the connecting hole.

As a preferred embodiment, the pressure supply device includes: the third flow channel is connected with the second chamber, and a compressed air pump, an air inlet valve, a connecting valve and a pressure gauge are sequentially arranged on the third flow channel; and the second branch pipeline is arranged on the third flow channel, the joint point between the second branch pipeline and the third flow channel is positioned between the connecting valve and the air inlet valve, and a first exhaust valve is arranged on the second branch pipeline.

As a preferred embodiment, the pressure supply device further includes: the second three-way valve is provided with a fourth interface, a fifth interface and a sixth interface, the fourth interface and the sixth interface are arranged on the first flow channel, the first cavity faces the direction of oil inlet of the gas relay, the fourth interface is located on the upstream of the sixth interface, and the fifth interface is connected with the first exhaust valve.

As a preferable embodiment, a fourth flow channel is arranged between the gas relay and the gas collecting device, one end of the fourth flow channel is connected with the top end of the gas relay, the other end of the fourth flow channel is connected with the top end of the gas collecting device, and a second exhaust valve is further arranged at the top end of the gas relay.

As a preferred embodiment, the gas collecting device and the gas relay are both provided with visible windows, and the visible windows are provided with marking lines.

In a preferred embodiment, the outer wall of the piston rod is provided with graduation marks.

Has the advantages that:

the transformer simulation sampling system provided by the embodiment of the specification can simulate the whole field sampling process of the transformer in a laboratory, can configure required various types of transformer internal fault samples for detection and diagnosis, and is suitable for professional skill training of electrical tests, live detection, operation and maintenance integration and the like.

According to henry's law, the solubility of a fault gas in oil is proportional to the equilibrium pressure of the gas above the oil level when the transformer is operating normally. Through taking a sample respectively to oil appearance and gas appearance, wherein the gas concentration in the oil appearance is actual value in the oil, converts the concentration of gas into theoretical value in the oil according to henry's law again, compares actual value in the oil with theoretical value in the oil and can be used to judge the trouble type of transformer, can include:

1. if the theoretical value is approximately equal to the actual value, it indicates that the fault gas is slowly dissolved in the equilibrium condition. If the content of each component is low, the operation of the transformer is normal, and other reasons for the gas relay alarm of the transformer are further analyzed; if the content of each component is higher, the potential hazard of generating fault gas slowly exists in the transformer arrangement;

2. if the theoretical value is obviously higher than the actual value, the potential hazard that fault gas is generated quickly exists in the transformer is shown;

3. if the characteristic gas is not found to be abnormal in the oil sample and the gas sample, the content of oxygen and nitrogen in the oil sample and the gas sample is further analyzed, and the source of the generated gas is judged.

Specific embodiments of the present application are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the application may be employed. It should be understood that the embodiments of the present application are not so limited in scope.

Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.

It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without inventive labor.

Fig. 1 is a schematic structural diagram of a transformer analog sampling system provided in an embodiment of the present disclosure;

fig. 2 is a schematic diagram of a transformer analog sampling system provided in an embodiment of the present disclosure during oil injection;

fig. 3 is a schematic diagram of a transformer analog sampling system provided in an embodiment of the present disclosure during fault gas injection.

Description of reference numerals:

1. a housing; 11. a first chamber; 12. a second chamber; 2. an oil supply device; 21. a first branch line; 22. a first ball valve; 23. an oil inlet pump; 24. an oil tank; 3. a gas relay; 31. a first oil outlet; 4. a gas supply device; 41. an air injection valve; 5. a gas collection device; 51. an air intake; 52. a second oil outlet; 61. an oil taking port; 62. a first three-way valve 63, a second three-way valve; 71. a piston rod; 72. a second ball valve; 73. scale lines; 8. a pressure supply device; 80. a compressed air pump; 81. an intake valve; 82. a connecting valve; 83. a pressure gauge; 84. a second branch line; 85. a first exhaust valve; 90. a second exhaust valve; 91. a visual window.

Detailed Description

The technical solution of the present invention will be described in detail with reference to the accompanying drawings and specific embodiments, it should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope, and after reading the present invention, the modifications of the various equivalent forms of the present invention by those skilled in the art will fall within the scope defined by the present application.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

The transformer analog sampling system of the embodiment of the present disclosure will be explained and explained with reference to fig. 1 to 3. It should be noted that, for convenience of description, like reference numerals denote like parts in the embodiments of the present invention. And for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments, and the descriptions of the same components may be mutually referred to and cited.

The present specification provides a transformer analog sampling system, as shown in fig. 1, comprising: a housing 1 having a first chamber 11 containing oil; the oil supply device 2 is communicated with the first cavity 11 and is used for filling oil into the first cavity 11; the gas relay 3 is used for storing fault gas and is provided with a first oil outlet 31 which can be opened and closed; the gas supply device 4 is communicated with the gas relay 3 and is used for injecting fault gas into the gas relay 3; gas collection device 5, with gas relay 3 is linked together for collect trouble gas, be provided with and open and close: an air intake 51 and a second oil outlet 52; a first flow passage is arranged between the gas relay 3 and the first chamber 11, an oil taking port 61 and a first switch mechanism which can be opened and closed are arranged on the first flow passage, a second flow passage is arranged between the gas collecting device 5 and the first chamber 11, and a second switch mechanism is arranged on the second flow passage.

Specifically, the housing 1 may be a hollow stainless steel tank. For example, the housing 1 may be a cylindrical sealed cylinder, closed at both ends. Of course, the specific shape of the housing 1 may be other regular or irregular shapes, and the application is not limited in this respect. The housing 1 is used for containing a sampling medium and comprises: the first chamber 11 is filled with insulating oil in which characteristic fault gas is dissolved through the oil supply device 2.

And the gas relay 3 is used for simulating a gas storage module after the gas acts. The gas relay 3 is communicated with the gas collecting device 5, and the gas collecting device 5 can store the gas transferred from the gas relay 3 and can be used for sampling the gas. Gas relay 3 is through the inside oiling of first runner, and gas collection device 5 is through the inside oiling of second runner, and at sample initial stage, need fill insulating oil with gas relay 3 and the inside space of gas collection device 5 to get rid of gas relay 3 and the inside original gas of gas collection device 5, prevent to mix the component concentration who dilutes the gas with the gas and lead to the inefficacy of testing result, guarantee the accuracy of gas sampling result. When the gas relay 3 and the gas collecting device 5 are internally gas-injected, the internal insulating oil is allowed to flow out by opening the first oil outlet 31 and the second oil outlet 52, so that the gas can be smoothly injected. The first oil outlet 31 and the second oil outlet 52 can be connected to an oil outlet pipeline, and an oil drain valve can be disposed on the oil outlet pipeline, so that opening and closing of the oil outlets are achieved through the oil drain valve.

Further, in order to be favorable to observing the oil level inside gas relay 3 and gas collecting device 5 and be convenient for read the volume of oil appearance and gas appearance, all be provided with visual window 91 on gas relay 3 and the gas collecting device 5, and be provided with the mark line on the visual window 91. For example, the uppermost end of the labeling line is 0ml, and the lowermost end is 500 ml.

The gas supply device 4 is used for injecting fault gas into the gas relay 3, so that the gas relay 3 internally contains oil and gas two-phase media, and the gas action of the transformer gas relay 3 can be simulated. The gas supply device 4 may include a standard gas bottle, which stores therein characteristic fault gas generated by the transformer device, and may be controlled to be turned on or off with the gas relay 3 through the gas injection valve 41.

When the gas relay 3 filled with insulating oil is filled with a predetermined amount of fault gas, gas components and concentrations in a sample can be respectively detected by subsequently sampling oil and gas, and the fault type of the transformer can be analyzed by comparing the gas phase content in the oil with the gas sampling content. The oil taking port 61 may be disposed on the first flow channel, the oil taking port 61 may be a sampling branch pipeline disposed on the first flow channel, and an oil taking valve may be disposed to control on/off of the branch pipeline. The gas taking port 51 is arranged on the gas collecting device 5, the gas taking port 51 can be connected with a gas taking pipeline, and the gas taking pipeline is provided with a gas taking valve for controlling gas taking so as to realize the opening and closing of the gas taking port.

In one embodiment, as shown in fig. 1 and 2, the oil supply device 2 includes: a first branch line 21 provided on the first flow path; a first ball valve 22, an oil inlet pump 23 and an oil tank 24 which are arranged on the first branch pipeline 21, wherein an oil taking port 61 is positioned at the downstream of the first branch pipeline 21 in the direction of the oil inlet of the first chamber 11 to the gas relay 3. Specifically, when oiling into the first chamber 11, the first ball valve 22 and the oil feed pump 23 can be opened, the oil feed pump 23 pumps the insulating oil in the oil tank 24 through the first ball valve 22, the first branch pipeline 21 and the first flow passage, and when oil is required to be taken, since the oil taking port 61 is located at the downstream of the first branch pipeline 21, certain power can be provided for oil taking.

When the first chamber 11 injects insulating oil into the gas relay 3, the insulating oil can be made to enter the gas relay 3 through the first flow passage by opening the first switching mechanism. When insulating oil is injected into the gas collecting device 5, the insulating oil can enter the gas collecting device 5 through the second flow channel by opening the second switch mechanism.

In one embodiment, the first and second switching mechanisms are integrated into a first three-way valve 62, the first three-way valve 62 is disposed between the first and second flow passages, the first three-way valve 62 has a first port, a second port, and a third port, the first and second ports are disposed on the first flow passage, and the third port is disposed on the second flow passage. This first three-way valve 62 can be the solenoid valve, through controlling first interface and second interface intercommunication, can be so that first cavity 11 and gas relay 3 are linked together, through controlling first interface and third interface intercommunication, can be so that first cavity 11 and gas collecting device 5 are linked together, through controlling second interface and third interface intercommunication, can be so that first runner and second runner are linked together to can be linked together gas relay 3 and gas collecting device 5 are linked together.

In this specification, the housing 1 further includes a second chamber 12 for supplying pressure, the second chamber 12 is connected to a pressure supply device 8, a piston mechanism is slidably disposed between the second chamber 12 and the first chamber 11, and the piston mechanism can press oil in the first chamber 11 out by injecting gas into the second chamber 12 through the pressure supply device 8.

In use, when the first chamber 11 is supplied with insulating oil, gas under pressure is injected into the second chamber 12 by the pressure supply device 8, the injected gas acts on the piston mechanism, and the piston mechanism moves toward the bottom end of the housing 1, so that the insulating oil in the first chamber 11 can be pressed out to supply the gas relay 3 and the gas collecting device 5.

Specifically, the piston mechanism includes: the bearing plate is matched with the inner wall of the shell 1, the bearing plate separates the first cavity 11 from the second cavity 12, and a connecting hole is formed in the bearing plate; and the piston rod 71 is connected with the connecting hole, the piston rod 71 is of a hollow structure, one end of the piston rod 71 extends out of the shell 1 and is provided with a second ball valve 72 so as to be communicated with the outside through the second ball valve 72, and the other end of the piston rod is communicated with the first cavity 11 through the connecting hole. Further, the piston rod 71 may be made of a transparent material, so that the position of the insulating oil in the piston rod 71 can be clearly seen.

When gas with pressure is injected into the second chamber 12, the pressure acts on the pressure bearing plate and causes the pressure bearing plate to move downward to press out the insulating oil inside the first chamber 11. Since the piston rod 71 is connected to the pressure receiving plate, the length of the piston rod 71 exposed from the housing 1 is shortened. Since the length of the piston rod 71 is not changed, in use, the piston rod 71 moves downwards along with the reduction of the residual oil, and the exposed length is correspondingly reduced, namely, the volume of the residual oil is in direct proportion to the exposed length of the piston rod 71. By observing the length of the piston rod 71 exposed out of the housing 1, the volume of oil remaining in the housing 1 can be determined.

In one embodiment, in order to more intuitively determine the length of the piston rod 71 exposed out of the housing 1, the piston rod 71 may be provided with a scale mark 73, and the scale mark 73 may be calibrated according to the corresponding relationship between the length of the piston rod 71 exposed out of the housing 1 and the volume of the remaining oil. For example, the maximum volume of the housing 1 is 10L, and the scale lines 73 are in the nominal range of 0-10L. When the bearing plate moves upwards or downwards, the length of the piston rod 71 exposed out of the shell 1 is changed, the position of the corresponding scale mark 73 is changed, the volume of the current residual oil can be directly obtained by reading the scale, and the accurate control and the sampling volume reading are facilitated.

For accurate control of the sampling, in this embodiment, the second ball valve 72 may be opened and atmospheric pressure may act on the oil in the piston rod 71, which may be pressed out of the first chamber 11 due to the hollow structure of the piston rod 71 communicating with the first chamber 11. When the sampling is finished, the second ball valve 72 is closed to finish the sampling.

In one embodiment, as shown in fig. 1, the pressure supply device 8 includes: a third flow channel connected with the second chamber 12, wherein a compressed air pump 80, an air inlet valve 81, a connecting valve 82 and a pressure gauge 83 are sequentially arranged on the third flow channel; and a second branch pipe 84 disposed on the third flow passage, wherein a junction point between the second branch pipe 84 and the third flow passage is located between the connecting valve 82 and the intake valve 81, and a first exhaust valve 85 is disposed on the second branch pipe 84.

When oil needs to be filled into the gas relay 3 and the gas collecting device 5, the compressed air pump 80 is started, the air inlet valve 81 and the connecting valve 82 are opened, the first exhaust valve 85 is closed, air is filled into the second chamber 12, and therefore the oil in the first chamber 11 can be quickly pressed out. While the pressure inside the second chamber 12 can be controlled by means of a pressure gauge 83.

Further, the pressure supply device 8 further includes: the second three-way valve 63 is provided with a fourth port, a fifth port and a sixth port, the fourth port and the sixth port are arranged on the first flow channel, the fourth port is located at the upstream of the sixth port in the direction from the first chamber 11 to the gas relay 3, and the fifth port is connected with the first exhaust valve 85.

In this embodiment, the second three-way valve 63 may be an electromagnetic valve, and may be configured to communicate the fourth port with the sixth port by controlling the fourth port, so that the first flow channel is in a communication state, and communicate the fifth port by controlling the fourth port, and because the fourth port is close to the first chamber 11, the first chamber 11 may be communicated with the first exhaust valve 85, and communicate the first exhaust valve 85 with the first flow channel by controlling the fifth port to be communicated with the sixth port. When communicating with the fifth port by controlling the fourth port, it is possible to inject air into the first chamber 11 by means of the compressed air pump 80, the air intake valve 81, and the first exhaust valve 85 of the pressure supply device 8, thereby adjusting the position of the piston mechanism in the housing 1.

In this specification, a fourth flow channel is provided between the gas relay 3 and the gas collecting device 5, one end of the fourth flow channel is connected to the top end of the gas relay 3, the other end of the fourth flow channel is connected to the top end of the gas collecting device 5, and a second exhaust valve 90 is further provided at the top end of the gas relay 3.

The fourth flow channel connects the gas relay 3 with the gas collecting device 5, so that the gas stored in the gas relay 3 can enter the gas collecting device 5. When the gas relay 3 is filled with oil, the second exhaust valve 90 at the top end of the gas relay 3 needs to be opened in order to ensure pressure balance inside the gas relay 3.

The embodiment of the present specification further provides a sampling method using the transformer analog sampling system, where the sampling method includes:

step S10: controlling the fourth port to be communicated with the fifth port, and opening a compressed air pump 80, an air inlet valve 81 and a first exhaust valve 85;

step S20: closing the compressed air pump 80, the air inlet valve 81 and the first exhaust valve 85 when the piston mechanism rises to a first predetermined height;

step S30: opening the second ball valve 72, and filling oil into the first chamber 11 through the oil supply device 2;

step S40: when the oil is at a second predetermined height of the piston rod 71, closing the oil supply device 2 and the second ball valve 72;

step S50: opening the compressed air pump 80, the air inlet valve 81 and the connecting valve 82, supplying pressure to the second chamber 12, and injecting oil to the gas collecting device 5 and the gas relay 3 through the first flow channel and the second flow channel;

step S60: when the gas relay 3 and the gas collecting device 5 are filled with oil, the compressed air pump 80, the air inlet valve 81 and the connecting valve 82 are closed;

step S70: fault gas is injected into the gas relay 3 through the gas supply device 4, the first oil outlet 31 is opened, and gas injection is stopped when the liquid level in the gas relay 3 drops to a third preset height;

step S80: opening the second ball valve 72 and sampling at the oil taking port 61;

step S90: and opening the second oil outlet 52, filling oil into the gas relay 3 through the first flow channel, closing the second oil outlet 52 when the liquid level in the gas collecting device 5 does not fall, and sampling at the gas taking port 51.

Specifically, in the initial state, the piston rod 71 stops at the lowest end of the housing 1 under the action of its own weight, and the piston rod 71 needs to be lifted first. As shown in fig. 1, after the fourth joint and the fifth joint of the second three-way valve 63 are connected, the fourth joint and the fifth joint are connected and then are connected with the first exhaust valve 85 through the oil-resistant pipe, the compressed air pump 80, the air inlet valve 81 and the first exhaust valve 85 are opened, air is injected into the first chamber 11, the piston rod 71 is lifted under the action of air pressure, and after the piston rod 71 slowly rises to the scale mark 73 of 500mm, the compressed air pump 80, the air inlet valve 81 and the first exhaust valve 85 are sequentially closed.

In step S30, when the oil supply device 2 is used to fill the first chamber 11 with oil, the fourth port of the second three-way valve 63 needs to be controlled to communicate with the sixth port, and the second ball valve 72 needs to be opened, so that the first chamber 11 can discharge the internal gas during oil filling. Then, the first ball valve 22 and the oil feed pump 23 are opened, and the oil feed pump 23 pumps the insulating oil in the oil tank 24 to fill the first chamber 11 with the oil through the first ball valve 22, the first branch pipe 21 and the first flow passage. In this step, the inlet of the oil feed pump 23 is connected to the insulating oil containing the characteristic gas through the oil-resistant pipe, then the first ball valve 22 and the second ball valve 72 are opened, the fourth port of the second three-way valve 63 is controlled to be communicated with the sixth port, the first ball valve 22 and the second ball valve 72 are sequentially closed after the second ball valve 72 overflows with the oil, and the oil feed pump 23 is stopped.

In step S50, when the oil is injected into the gas relay 3 and the gas collecting device 5 through the first chamber 11, the oil in the first chamber 11 can be quickly pressed out by opening the compressed air pump 80, opening the air intake valve 81, the connecting valve 82, and closing the first exhaust valve 85 to inject air into the second chamber 12. In this step, it is necessary to control the fourth port of the second three-way valve 63 to communicate with the sixth port, the first port of the first three-way valve 62 to communicate with the third port, and the second vent valve 90 to open, and when the liquid level in the gas relay 3 reaches 0mL, the first port of the first three-way valve 62 is controlled to communicate with the second port, and the gas collecting device 5 and the gas relay 3 are stopped from being filled with oil.

In step S70, as shown in fig. 3, by connecting the standard gas bottle to one side of the gas injection valve 41, gas is injected into the gas relay 3, and at the same time, the oil discharge valve is opened to open the first oil outlet 31, the gas injection valve 41, and the second exhaust valve 90, the oil level in the gas relay 3 slowly drops, when the oil level drops to 250mL, the oil discharge valve is closed, and the gas in the upper space of the gas relay 3 continues to be replaced with the gas in the standard gas bottle, and after 2 minutes, the gas injection valve 41 and the second exhaust valve 90 are closed.

In step S80, when sampling oil, the first ball valve 22 and the second ball valve 72 may be opened, and the fourth port of the second three-way valve 63 may be controlled to communicate with the sixth port, so that the oil sampling operation is performed by opening the oil sampling valve to open the oil sampling port 61.

In step S90, when a gas sample is taken, the first port and the second port of the first three-way valve 62 are controlled to communicate with each other, oil is injected into the gas relay 3 to promote the gas in the gas relay 3 to transfer to the gas collecting device 5, and the oil discharge valve is opened to open the second oil outlet 52, so that the insulating oil in the gas collecting device 5 is continuously replaced by the fault gas, and the liquid level in the gas collecting device 5 slowly drops. When the gas in the gas relay 3 is transferred, the gas relay 3 is filled with insulating oil gradually, and the insulating oil in the gas relay 3 starts to be transferred to the gas relay 3, so that the liquid level in the gas collecting device 5 does not drop any more. Therefore, when the liquid level in the gas collecting device 5 shows no change any more, it can be represented that the gas in the gas relay 3 has been completely transferred, and the second oil outlet 52 is closed. Because the insulating oil in the gas relay 3 is continuously transferred to the gas collecting device 5, the gas in the gas collecting device 5 can be pressed out, and the gas sampling operation is performed by opening the gas taking valve to open the gas taking port 51.

In this specification, when the oil sample in the sampling system is exhausted, the above steps are repeated.

In this specification, the degree of failure is determined by comparing an oil sample and a gas sample. The specific method can convert the content of the free gas into the content of the dissolved gas in the oil under the equilibrium condition, and calculate the ratio of the content of the free gas to the content of the dissolved gas in the oil. According to henry's law, the solubility of a fault gas in oil is proportional to the equilibrium pressure of the gas above the oil level when the transformer is operating normally. The gas concentration in the oil sample is the actual value in the oil, converts the gas concentration into the theoretical value in the oil according to Henry's law again, compares actual value in the oil with the theoretical value in the oil and can be used to judge the fault type of transformer, can include:

The above embodiments are merely illustrative of the technical concepts and features of the present application, and the purpose of the present invention is to enable those skilled in the art to understand the content of the present application and implement the present application, and not to limit the protection scope of the present application. All equivalent changes and modifications made according to the spirit of the present application should be covered in the protection scope of the present application.

All articles and references disclosed, including patent applications and publications, are hereby incorporated by reference for all purposes. The term "consisting essentially of …" describing a combination shall include the identified element, ingredient, component or step as well as other elements, ingredients, components or steps that do not materially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe combinations of elements, components, or steps herein also contemplates embodiments that consist essentially of such elements, components, or steps. By using the term "may" herein, it is intended to indicate that any of the described attributes that "may" include are optional.

A plurality of elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step may be divided into separate plural elements, components, parts or steps. The disclosure of "a" or "an" to describe an element, ingredient, component or step is not intended to foreclose other elements, ingredients, components or steps.

It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The disclosures of all articles and references, including patent applications and publications, are hereby incorporated by reference for all purposes.

Claims

1. A transformer analog sampling system, comprising:

a housing having a first chamber containing oil;

2. The transformer analog sampling system of claim 1, wherein the oil supply device comprises: a first branch line disposed on the first flow passage; the first ball valve, the oil inlet pump and the oil tank are arranged on the first branch pipeline, wherein the first cavity is arranged in the direction of oil inlet of the gas relay, and the oil taking port is arranged at the downstream of the first branch pipeline.

3. The transformer analog sampling system of claim 2, wherein the first and second switching mechanisms are integrated into a first three-way valve disposed between the first and second flow paths, the first three-way valve having a first port, a second port, and a third port, the first and second ports disposed on the first flow path, the third port disposed on the second flow path.

4. The transformer analog sampling system of claim 1, wherein the housing further comprises a second chamber for supplying pressure, a pressure supply device is connected to the second chamber, a piston mechanism is slidably disposed between the second chamber and the first chamber, and oil in the first chamber can be pressed out by the piston mechanism through gas injection into the second chamber by the pressure supply device.

5. The transformer analog sampling system of claim 4, wherein the piston mechanism comprises: the bearing plate is matched with the inner wall of the shell and divides the first cavity from the second cavity, and a connecting hole is formed in the bearing plate; and the piston rod is of a hollow structure, one end of the piston rod extends out of the shell and is provided with a second ball valve so as to be communicated with the outside through the second ball valve, and the other end of the piston rod is communicated with the first cavity through the connecting hole.

6. The transformer analog sampling system of claim 5, wherein the voltage supply means comprises: the third flow channel is connected with the second chamber, and a compressed air pump, an air inlet valve, a connecting valve and a pressure gauge are sequentially arranged on the third flow channel; and the second branch pipeline is arranged on the third flow channel, the joint point between the second branch pipeline and the third flow channel is positioned between the connecting valve and the air inlet valve, and a first exhaust valve is arranged on the second branch pipeline.

7. The transformer analog sampling system of claim 6, wherein the voltage supply means further comprises: the second three-way valve is provided with a fourth interface, a fifth interface and a sixth interface, the fourth interface and the sixth interface are arranged on the first flow channel, the first cavity faces the direction of oil inlet of the gas relay, the fourth interface is located on the upstream of the sixth interface, and the fifth interface is connected with the first exhaust valve.

8. The transformer analog sampling system according to claim 1, wherein a fourth flow channel is arranged between the gas relay and the gas collecting device, one end of the fourth flow channel is connected with the top end of the gas relay, the other end of the fourth flow channel is connected with the top end of the gas collecting device, and a second exhaust valve is further arranged at the top end of the gas relay.

9. The transformer analog sampling system of claim 8, wherein the gas collection device and the gas relay are each provided with a visible window, and the visible windows are provided with marking lines.

10. The transformer analog sampling system of claim 5, wherein the outer wall of the piston rod is provided with graduation marks.