Main transformer sleeve oil discharging and supplementing device with sealing detection function and detection method

Abstract

The invention discloses a main transformer sleeve oil discharging and supplementing device with a sealing detection function and a detection method, and relates to the technical field of sealing detection. A main transformer sleeve oil discharging and supplementing device with a sealing detection function comprises a sleeve body which is provided with a pressure meter and an oil discharging and supplementing nozzle. The oil discharging and supplementing machine is connected with a first oil pipe and a second oil pipe, and the second oil pipe is connected with an oil reservoir; the oil storage tank is connected with the first oil pipe and provided with a third oil pipe connected with the oil discharging and supplementing nozzle, and the third oil pipe is provided with a reversing valve. The detection method adopts the oil discharging and supplementing device with the sealing detection function for the main transformer sleeve, and comprises the following steps of: stabilizing the pressure for a period of time after oil supplementing or oil discharging operation, and then observing whether the pressure numerical value condition of the pressure gauge is within a reasonable numerical value range or not. According to the main transformer sleeve oil discharging and supplementing device with the sealing detection function and the detection method, potential safety hazards can be discharged in time, the service life of a transformer is prolonged, and economic losses caused by uncertain factors are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of seal detection, and in particular to a main transformer casing oil draining and replenishing device with a seal detection function and a detection method. Background Art

[0002] During the operation of the transformer main bushing, the performance of the insulating oil will be affected due to the long-term high voltage. In order to monitor the performance of the insulating oil, the insulating oil needs to be tested. During periodic routine inspections and irregular spot checks, maintenance personnel will extract oil from the main bushing.

[0003] At present, maintenance personnel use the exhaust holes to drain and replenish oil from oil-immersed capacitor bushings when the main equipment is out of power. After the oil replenishment is completed, the exhaust hole seal is restored. After the exhaust hole bolts are restored, there are cases where the rubber gasket seal is not pressed in place or overpressure causes the rubber gasket to deform, and there is no effective detection method during the on-site maintenance process, resulting in the hidden danger of poor sealing. Usually, if the poor sealing of the main transformer bushing is not discovered in time, it will not cause equipment failure in a short period of time. However, in the long-term operation, it will cause the insulating oil inside the main transformer bushing to get wet, which will affect the insulation performance of the electrical equipment, bring many uncertainties to the safe and stable operation of the transformer, and cause serious safety accidents.

[0004] Therefore, the existing maintenance process technology needs to be improved. Summary of the invention

[0005] The technical problem to be solved by the present invention is that after the oil is taken out or replenished from the casing body, due to the lack of reliable detection means and relevant process flow, the poor sealing of the rubber gasket at the exhaust hole cannot be discovered in time, thereby causing uncertain factors and resulting in safety accidents. The purpose is to provide a main transformer casing oil draining and replenishing device and a detection method with a sealing detection function, adopt relevant technical solutions to detect the sealing performance of the casing, improve the maintenance process, eliminate safety hazards, prevent the risk of main transformer explosion caused by poor sealing of the casing, and ensure safe and stable operation of the equipment.

[0006] The present invention is achieved through the following technical solutions:

[0007] In a first aspect, the present invention provides a main transformer casing oil draining and replenishing device with a sealing detection function, comprising:

[0008] Bushing body: The bushing body is fixedly arranged on the top of the transformer, the bushing body is provided with a pressure gauge reflecting the internal pressure, and the bushing body is provided with an oil drain and oil replenishment nozzle;

[0009] Oil draining and replenishing machine: the oil draining and replenishing machine is connected with a first oil pipe and a second oil pipe, and the second oil pipe is connected with an oil reservoir;

[0010] Oil storage tank: the oil storage tank is connected to the first oil pipe, the oil storage tank is provided with a third oil pipe connected to the oil drain and oil replenishment nozzle, and the third oil pipe is provided with a reversing valve;

[0011] The inlet of the third oil pipe is located below the oil level in the oil reservoir, and the outlet of the first oil pipe is located above the oil level in the oil reservoir.

[0012] Furthermore, in the present invention, the portion of the second oil pipe extending into the oil reservoir is provided with a spiral elastic section, the oil reservoir is provided with a floating member floating on the oil surface, a filter is provided below the floating member, and the second oil pipe is connected to the filter.

[0013] Furthermore, in the present invention, a collecting groove is provided on the inner bottom surface of the oil reservoir, and a guide column passing through the floating member is provided inside the oil reservoir, and when the floating member descends, the guide column guides the filter to enter the collecting groove.

[0014] Furthermore, in the present invention, a connecting ring is provided below the above-mentioned floating member, the filter includes a shell, a socket threadedly connected to the connecting ring is provided on the top of the shell, the second oil pipe passes through the floating member and the socket and is inserted into the interior of the shell, filter holes are provided on the side and bottom of the shell, and a filter element covering the filter holes is provided inside the shell.

[0015] Furthermore, in the present invention, a sealing ring abutting against the bottom surface of the floating member is provided on the top of the shell.

[0016] Furthermore, in the present invention, the opening of the oil reservoir is provided with a blocking cover, and the blocking cover is fixedly connected to the second oil pipe.

[0017] Furthermore, in the present invention, a top groove is provided at the top of the above-mentioned oil storage tank, the top end of the first oil pipe extends into the top groove, the first oil pipe sleeve is provided with a floating seal, the floating seal includes a floating base, the floating base is provided with a sealing ring inserted between the top groove and the first oil pipe, and the sealing ring is provided with a guiding slope.

[0018] Furthermore, in the present invention, the oil drain and replenishment nozzle is provided with a ball valve, and a battery for supplying energy is provided inside the oil drain and replenishment machine.

[0019] In a second aspect, the present invention further provides a detection method, which, in addition to using the above-mentioned main transformer casing oil draining and replenishing device with a sealing detection function, also includes a method:

[0020] Prepare the oil drain and replenishment machine, oil storage tank and oil reservoir, connect the first oil pipe, the second oil pipe and the third oil pipe, and connect the third oil pipe to the oil drain and replenishment nozzle;

[0021] After the reversing valve is adjusted to the oil replenishing direction, the oil draining and replenishing machine is started to send the oil in the oil reservoir into the casing body. After the oil replenishing is completed, the reversing valve is closed to stabilize the pressure. After 30 seconds, the pressure value of the pressure gauge is observed;

[0022] If the seal is poor according to the pressure value of the pressure gauge, the casing body is repaired; if the seal is intact according to the pressure value of the pressure gauge, the third oil pipe is removed to complete the oil filling and seal detection;

[0023] After the reversing valve is adjusted to the oil discharge direction, the oil discharge and replenishment machine is started to pump the oil storage tank to a negative pressure state, and the oil in the casing body is discharged into the oil storage tank. After the oil is discharged, the reversing valve is closed to stabilize the pressure. After 30 seconds, the pressure value of the pressure gauge is observed;

[0024] If the seal is poor according to the pressure value of the pressure gauge, the casing body is repaired. If the seal is intact according to the pressure value of the pressure gauge, the third oil pipe is removed to complete the oil drainage and seal detection.

[0025] Furthermore, in the present invention, the ball valve of the oil drain and oil replenishment nozzle is closed before the third oil pipe is disassembled, and the oil leakage of the oil drain and oil replenishment nozzle is cleaned after the third oil pipe is disassembled.

[0026] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0027] The main transformer bushing oil draining and replenishing device with sealing detection function provided by the present invention comprises a bushing main body, an oil draining and replenishing machine, an oil storage tank and an oil reservoir, which are connected to each other through a first oil pipe, a second oil pipe and a third oil pipe. After the oil replenishing or draining operation, the pressure is stabilized for a period of time, and then the pressure value of the pressure gauge is observed to see whether it is within a reasonable value range. If it is within the range, it is judged that the bushing main body is sealed in good condition. If it is not within the range, it is judged that the bushing main body is sealed poorly and the bushing main body needs to be repaired or replaced. Sealing detection can eliminate safety hazards in a timely manner, extend the service life of the transformer, and reduce economic losses caused by uncertain factors.

[0028] The present invention also provides a detection method. After the reversing valve is adjusted to the oil replenishing direction, the oil draining and replenishing machine is started to send the oil in the oil reservoir into the casing body. After the oil replenishing is completed, the reversing valve is closed to stabilize the pressure, and the pressure value of the pressure gauge is observed after 30 seconds. After the reversing valve is adjusted to the oil discharging direction, the oil draining and replenishing machine is started to pump the accumulated oil tank to a negative pressure state, and the oil in the casing body is discharged into the accumulated oil tank. After the oil discharging is completed, the reversing valve is closed to stabilize the pressure, and the pressure value of the pressure gauge is observed after 30 seconds. Whether the seal is intact is judged according to the pressure value of the pressure gauge. The sealing detection can eliminate safety hazards in time and avoid water ingress and moisture caused by poor sealing, which may cause safety accidents. Therefore, the detection method of the present invention can discover and detect the safe operation of the casing and prevent the risk of combustion and explosion, thereby ensuring the safe and stable operation of the transformer, and has the advantages of extending the service life of the transformer and reducing the economic losses caused by uncertain factors. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0030] Figure 1 It is a schematic diagram of the main transformer casing oil draining and replenishing device with sealing detection function of the present invention;

[0031] Figure 2 It is a schematic diagram of the interior of the oil storage tank of the present invention;

[0032] Figure 3 It is a schematic diagram of the interior of the oil storage device of the present invention when it is full of oil;

[0033] Figure 4 It is a schematic diagram of the interior of the oil storage device of the present invention when the oil is low;

[0034] Figure 5 is a schematic diagram of the interior of the filter of the present invention;

[0035] Figure 6 is a schematic diagram of a floating seal of the present invention (when not sealed);

[0036] Figure 7 Schematic diagram of the floating seal of the present invention (when sealing).

[0037] Markings and corresponding parts names in the accompanying drawings: 1-casing body, 101-oil replenishing nozzle, 102-ball valve, 2-oil replenishing machine, 201-first oil pipe, 202-second oil pipe, 2021-spiral elastic section, 3-storage oil tank, 301-third oil pipe, 302-reversing valve, 303-top groove, 4-transformer, 5-pressure gauge, 6-oil reservoir, 601-floating part, 602-collecting tank, 603-guide column, 604-blocking cover, 605-connecting ring, 7-filter, 701-housing, 702-jack, 703-filter element, 704-sealing ring, 8-floating seal, 801-floating base, 802-sealing ring, 803-guide ramp. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the embodiments and drawings. The schematic implementation mode of the present invention and its description are only used to explain the present invention and are not intended to limit the present invention. The following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0039] It should be noted that similar numbers and letters represent similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of the embodiments of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "setting", "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, and it can be the internal connection of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0040] Example 1

[0041] like Figures 1 to 7 As shown, Embodiment 1 of the present invention provides a main transformer casing oil draining and replenishing device with a sealing detection function, and the specific structure is described as follows.

[0042] Combination Figure 1As shown, the main transformer bushing oil draining and replenishing device with sealing detection function of this embodiment is mainly composed of four parts: a bushing body 1, an oil draining and replenishing machine 2, an oil storage tank 3 and an oil reservoir 6. The bushing body 1 is the main insulating part outside the transformer 4 box, and is used for the lead-out wire of the transformer 4 winding to pass through; the oil draining and replenishing machine 2 is used to send oil into the bushing body 1, or to extract the oil in the bushing body 1; the oil storage tank 3 is used to temporarily store the oil extracted from the bushing body 1; and the oil reservoir 6 is used to store the oil to be sent into the bushing body 1.

[0043] Further, combined with Figure 1 As shown, the bushing body 1 is configured as a main transformer bushing in the prior art, and is fixedly mounted on the top of the transformer 4 through a flange. A pressure gauge 5 is installed at the oil storage position on the top of the bushing body 1. The pressure gauge 5 can detect the pressure inside the bushing body 1, which is convenient for the staff to judge the sealing condition of the bushing body 1. It should be noted that the pressure gauge 5 can be a liquid level gauge or other forms, such as a glass observation window that reflects the internal liquid level.

[0044] And, combined with Figure 1 As shown, an oil drain nozzle 101 is installed at the bottom of the sleeve body 1, and the outlet of the oil drain nozzle 101 is horizontally facing the right side. The oil inside the sleeve body 1 is discharged through the oil drain nozzle 101, and the external oil is also sent into the sleeve body 1 through the oil drain nozzle 101.

[0045] In some implementations of this embodiment, the oil draining and replenishing machine 2 adopts the quantitative oil draining and replenishing device for related oil-deficient equipment in substations in the prior art. The oil draining and replenishing machine 2 is connected to a first oil pipe 201 and a second oil pipe 202. The second oil pipe 202 extends into the oil reservoir 6 and is used to extract the oil in the oil reservoir 6.

[0046] It should be noted that a storage battery for power supply is installed inside the oil-discharging and replenishing machine 2. Relying on the function of the storage battery, the oil-discharging and replenishing machine 2 can be used without external power supply wires, and has better portability.

[0047] Further, combined with Figure 1 and Figure 2 As shown, the other end of the first oil pipe 201 away from the oil drain and replenishing machine 2 is connected to the oil storage tank 3. The oil storage tank 3 is a cylindrical sealing structure, and there is a chamber for storing oil inside the oil storage tank 3. The first oil pipe 201 passes through the bottom center position of the oil storage tank 3 and is vertically inserted into the chamber of the oil storage tank 3, and the port of the first oil pipe 201 is close to the top surface of the chamber of the oil storage tank 3.

[0048] Furthermore, combined Figure 1 and Figure 2As shown, the left side of the oil storage tank 3 is connected to a third oil pipe 301, the inlet of the third oil pipe 301 is located at the bottom of the chamber of the oil storage tank 3, and the end of the third oil pipe 301 away from the oil storage tank 3 is connected to the oil drain nozzle 101, which is convenient for oil replenishment or oil discharge. The inlet of the third oil pipe 301 is located below the oil level in the oil reservoir 6, and the outlet of the first oil pipe 201 is located above the oil level in the oil reservoir 6. When draining oil, the oil in the casing body 1 enters the oil storage tank 3 and does not enter the first oil pipe 201, so as to avoid the discharged oil from contaminating the oil in the first oil pipe 201, the second oil pipe 202 or the oil in the oil reservoir 6.

[0049] It should be noted that a reversing valve 302 is installed on the third oil pipe 301 to control the flow direction of the oil and better realize oil discharge or oil replenishment.

[0050] Combination Figure 6 and Figure 7 As shown, in order to prevent the discharged oil from flowing back into the oil drain and replenishment machine 2, a top groove 303 is opened on the top wall of the inner cavity of the storage tank 3, and the top end of the first oil pipe 201 extends into the top groove 303, and the top opening of the first oil pipe 201 does not contact the groove wall of the top groove 303. The floating seal 8 includes a floating base 801 and a sealing ring 802, and the sealing ring 802 is fixed on the top of the floating base 801. The floating base 801 and the sealing ring 802 are both sleeved on the first oil pipe 201 and can move up and down along the first oil pipe 201. When the liquid level of the oil in the storage tank 3 rises, the sealing ring 802 of the floating base 801 is inserted between the top groove 303 and the first oil pipe 201.

[0051] Further, combined with Figure 7 As shown, a guiding slope 803 is provided on the outer side of the sealing ring 802, and the cross-sectional width of the top end of the sealing ring 802 is smaller than the width between the top groove 303 and the first oil pipe 201, and the cross-sectional width of the bottom end of the sealing ring 802 is larger than the width between the top groove 303 and the first oil pipe 201, so as to facilitate the insertion of the sealing ring 802 and achieve a better sealing effect.

[0052] In some implementations of this embodiment, the oil liquid standing in the oil reservoir 6 will automatically settle to the bottom of the oil reservoir 6 due to gravity, so the oil liquid at the bottom of the oil reservoir 6 is generally turbid. In order to avoid sending turbid oil liquid into the casing body 1 and bringing safety operation risks to the casing body 1, this embodiment is provided with a floating member 601.

[0053] Combination Figure 3 and Figure 4As shown, the oil reservoir 6 stores oil inside, and the floating member 601 is a hollow plastic plate, and the floating member 601 can float on the surface of the oil in the oil reservoir 6. A blocking cover 604 is installed on the top of the oil reservoir 6, and the blocking cover 604 is threadedly connected to the top of the oil reservoir 6. The second oil pipe 202 passes through the center of the blocking cover 604, and a flange is fixedly sleeved on the second oil pipe 202, and the flange is fixedly connected to the top of the blocking cover 604.

[0054] Further, combined with Figure 3 and Figure 4 As shown, the second oil pipe 202 has a spiral elastic section 2021, which is a spirally wound second oil pipe 202 and has a certain elasticity. The spiral elastic section 2021 is located inside the oil reservoir 6. The second oil pipe 202 is connected to the floating member 601, and the inlet end of the second oil pipe 202 is located below the floating member 601. The floating member 601 can follow the drop of the oil level to ensure that the inlet end of the second oil pipe 202 is always the oil near the extraction liquid surface, avoiding direct extraction of the turbid oil containing more impurities at the bottom, so that the casing body 1 can work better.

[0055] It should be noted that the spiral elastic section 2021 has a certain elasticity, and the spiral elastic section 2021 can expand and contract with the floating member 601, and the use effect is better.

[0056] Combination Figure 3 and Figure 5 As shown, the filter 7 is mainly composed of a housing 701, a filter element 703 and a sealing ring 704. The housing 701 is cylindrical and made of aluminum alloy. A plug hole 702 is provided on the top of the housing 701. The hole wall of the plug hole 702 has an internal thread. A connecting ring 605 is provided on the top of the floating member 601. The side wall of the connecting ring 605 is provided with an external thread. The housing 701 and the connecting ring 605 are threadedly connected by the matching of the external thread and the internal thread, which has the advantages of stable connection and convenient disassembly. The inlet end of the second oil pipe 202 passes through the floating member 601 and the plug hole 702 and is inserted into the interior of the housing 701.

[0057] Further, combined with Figure 5 As shown, the side and bottom of the shell 701 are provided with a plurality of filter holes, the side and bottom of the shell 701 are provided with an interlayer inside, and a filter element 703 is installed in the interlayer. The filter element 703 is a glass fiber filter element or a synthetic fiber filter element, which has a good filtering effect on the insulating oil.

[0058] Furthermore, Figure 5As shown, a sealing ring 704 is fixedly installed on the top of the shell 701. After the shell 701 and the connecting ring 605 are connected, the sealing ring 704 is squeezed by the top surface of the shell 701 and the bottom surface of the floating member 601. The sealing ring 704 plays a sealing role to prevent the oil from entering the shell 701 without being filtered, thereby ensuring the quality of the oil sent into the casing body 1.

[0059] In some implementations of this embodiment, in order to fully utilize the oil in the oil reservoir 6, a collecting groove 602 is provided on the bottom surface of the oil reservoir 6, so that the remaining oil can be collected in the collecting groove 602, and the filter 7 can be inserted into the collecting groove 602 (in this case, Figure 4 As shown), it is convenient to extract the oil for use, fully utilize it and reduce waste.

[0060] Furthermore, in order to ensure that the filter 7 can accurately enter the collecting tank 602, two vertical guide pillars 603 are fixed at the bottom of the oil reservoir 6, and holes are opened on the floating member 601 for the guide pillars 603 to pass through. The floating member 601 can go straight up and down along the guide pillars 603, so that the filter 7 can accurately enter the collecting tank 602, and the use effect is better.

[0061] The working principle of this embodiment:

[0062] After the reversing valve 302 is adjusted to the oil replenishing direction, the oil draining and replenishing machine 2 is started to send the oil in the oil reservoir 6 into the casing body 1. After the oil replenishing is completed, the reversing valve 302 is closed to stabilize the pressure. After 30 seconds, the pressure value of the pressure gauge 5 is observed; after the reversing valve 302 is adjusted to the oil discharging direction, the oil draining and replenishing machine 2 is started to pump the accumulated oil tank 3 to a negative pressure state, and the oil in the casing body 1 is discharged into the accumulated oil tank 3. After the oil discharging is completed, the reversing valve 302 is closed to stabilize the pressure. After 30 seconds, the pressure value of the pressure gauge 5 is observed. Whether the seal is intact is determined based on the pressure value of the pressure gauge 5. The sealing detection can eliminate safety hazards in a timely manner and prevent the casing body 1 from being dampened due to poor sealing, causing safety accidents.

[0063] Example 2

[0064] The present embodiment provides a testing method, which adopts the main transformer casing oil draining and replenishing device with sealing detection function of embodiment 1, and also includes the following method: prepare the oil draining and replenishing machine 2, the oil storage tank 3 and the oil reservoir 6, and connect the first oil pipe 201, the second oil pipe 202 and the third oil pipe 301, and connect the third oil pipe 301 to the oil draining and replenishing nozzle 101; after the reversing valve 302 is adjusted to the oil replenishing direction, start the oil draining and replenishing machine 2 to send the oil in the oil reservoir 6 into the casing body 1, and after the oil replenishing is completed, the reversing valve 302 is closed to stabilize the pressure, and the pressure value of the pressure gauge 5 is observed after 30 seconds; if it is judged that the sealing is poor according to the pressure value of the pressure gauge 5, The casing body 1 is repaired. If the seal is judged to be intact according to the pressure value of the pressure gauge 5, the third oil pipe 301 is disassembled to complete the oil replenishment and seal detection; after the reversing valve 302 is adjusted to the oil discharge direction, the oil discharge and replenishing machine 2 is started to pump the accumulated oil tank 3 to a negative pressure state, and the oil in the casing body 1 is discharged into the accumulated oil tank 3. After the oil discharge is completed, the reversing valve 302 is closed to stabilize the pressure, and the pressure value of the pressure gauge 5 is observed after 30 seconds; if the seal is judged to be poor according to the pressure value of the pressure gauge 5, the casing body 1 is repaired. If the seal is judged to be intact according to the pressure value of the pressure gauge 5, the third oil pipe 301 is disassembled to complete the oil discharge and seal detection.

[0065] Before disassembling the third oil pipe 301 , close the ball valve 102 of the oil drain and replenishment nozzle 101 . After disassembling the third oil pipe 301 , clean the oil leakage of the oil drain and replenishment nozzle 101 .

[0066] Since the casing body 1 itself is a rigid structure, the internal pressure of the casing body 1 in two states can be calculated by the following formula:

[0067] If it is in a sealed state: the internal space of the casing body 1 is filled with gas and oil. Due to the pressure transmission characteristics, the pressure of the casing body 1 is the gas pressure P 气 With insulating oil pressure P 油 Under normal circumstances, the gas pressure P 气 =nRT / V 气 , where n represents the number of gas molecules per unit volume, R is a constant, T is the internal gas temperature, V 气 is the volume of the gas. It can be seen that the greater the gas content, the greater the gas pressure will be, the higher the gas temperature, the greater the gas pressure will be, and the smaller the gas volume, the greater the gas pressure will be.

[0068] If not sealed: P 油 = ρgh, where ρ is the density of the oil, g is the acceleration due to gravity, and h is the height from the oil surface to the oil outlet. Since ρ remains basically unchanged, P 油 Mainly determined by the oil level.

[0069] Through the above conclusions, it can be concluded that when the casing body 1 is in a sealed state, the internal pressure of the casing body 1 is composed of two parts; in an unsealed state, the internal pressure of the casing body 1 is directly the pressure of the relative height of the internal oil level. Therefore, during the oil replenishment and oil discharge process, the internal oil amount of the casing body 1 is changed to detect the sealing of the main transformer casing.

[0070] To sum up, in the first aspect, the present invention provides a main transformer bushing oil draining and replenishing device with a sealing detection function, which includes a bushing body 1: the bushing body 1 is fixedly arranged on the top of the transformer 4, the bushing body 1 is provided with a pressure gauge 5 that reflects the internal pressure situation, and the bushing body 1 is provided with an oil draining and replenishing nozzle 101; an oil draining and replenishing machine 2: the oil draining and replenishing machine 2 is connected to a first oil pipe 201 and a second oil pipe 202, and the second oil pipe 202 is connected to an oil reservoir 6; an oil storage tank 3: the oil storage tank 3 is connected to the first oil pipe 201, the oil storage tank 3 is provided with a third oil pipe 301 connected to the oil draining and replenishing nozzle 101, and the third oil pipe 301 is provided with a reversing valve 302; the inlet of the third oil pipe 301 is located below the oil level in the oil reservoir 6, and the outlet of the first oil pipe 201 is located above the oil level in the oil reservoir 6. The portion of the second oil pipe 202 extending into the oil reservoir 6 is provided with a spiral elastic section 2021. The oil reservoir 6 is provided with a floating member 601 floating on the oil surface. A filter 7 is provided below the floating member 601. The second oil pipe 202 is connected to the filter 7. A collecting groove 602 is provided on the inner bottom surface of the oil reservoir 6. A guide column 603 passing through the floating member 601 is provided inside the oil reservoir 6. When the floating member 601 descends, the guide column 603 guides the filter 7 to enter the collecting groove 602. A connecting ring 605 is provided below the floating member 601. The filter 7 includes a housing 701. A plug hole 702 threadedly connected to the connecting ring 605 is provided on the top of the housing 701. The second oil pipe 202 passes through the floating member 601 and the plug hole 702 and is inserted into the housing 701. Filter holes are provided on the side and bottom of the housing 701. A filter element 703 covering the filter holes is provided inside the housing 701. The top of the housing 701 is provided with a sealing ring 704 that abuts against the bottom of the floating member 601. The opening of the oil reservoir 6 is provided with a stopper 604, which is fixedly connected to the second oil pipe 202. The oil drain and replenishment nozzle 101 is provided with a ball valve 102. The oil drain and replenishment machine 2 is provided with a battery for power supply.

[0071] In the second aspect, the present invention also provides a detection method, which adopts the above-mentioned main transformer casing oil draining and replenishing device with sealing detection function, and also includes the method: prepare the oil draining and replenishing machine 2, the oil storage tank 3 and the oil reservoir 6, and connect the first oil pipe 201, the second oil pipe 202 and the third oil pipe 301, and connect the third oil pipe 301 to the oil draining and replenishing nozzle 101; after the reversing valve 302 is adjusted to the oil replenishing direction, the oil draining and replenishing machine 2 is started to send the oil in the oil reservoir 6 into the casing body 1, and after the oil replenishment is completed, the reversing valve 302 is closed to stabilize the pressure, and the pressure value of the pressure gauge 5 is observed after 30s; if it is judged that the seal is poor according to the pressure value of the pressure gauge 5 , repair the casing body 1. If the seal is in good condition according to the pressure value of the pressure gauge 5, disassemble the third oil pipe 301, complete the oil replenishment and seal detection; after adjusting the reversing valve 302 to the oil discharge direction, start the oil discharge and replenishment machine 2 to pump the oil storage tank 3 to a negative pressure state, and the oil in the casing body 1 is discharged into the oil storage tank 3. After the oil discharge is completed, the reversing valve 302 is closed to stabilize the pressure, and the pressure value of the pressure gauge 5 is observed after 30 seconds; if the seal is poor according to the pressure value of the pressure gauge 5, repair the casing body 1. If the seal is in good condition according to the pressure value of the pressure gauge 5, disassemble the third oil pipe 301, complete the oil discharge and seal detection. Before disassembling the third oil pipe 301, close the ball valve 102 of the oil discharge nozzle 101, and after disassembling the third oil pipe 301, clean the oil leakage of the oil discharge nozzle 101.

[0072] Therefore, the main transformer casing oil draining and replenishing device and detection method with sealing detection function of the present invention has the beneficial effects of timely sealing detection during oil draining and replenishing, eliminating safety hazards, and reducing economic losses.

[0073] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A main transformer casing oil draining and replenishing device with sealing detection function, characterized in that: include, Bushing body (1): the bushing body (1) is fixedly arranged on the top of the transformer (4), the bushing body (1) is provided with a pressure gauge (5) for reflecting the internal pressure condition, and the bushing body (1) is provided with an oil drain and oil replenishment nozzle (101); Oil draining and replenishing machine (2): the oil draining and replenishing machine (2) is connected to a first oil pipe (201) and a second oil pipe (202), and the second oil pipe (202) is connected to an oil reservoir (6); An oil storage tank (3): the oil storage tank (3) is connected to the first oil pipe (201), the oil storage tank (3) is provided with a third oil pipe (301) connected to the oil drain and replenishment nozzle (101), and the third oil pipe (301) is provided with a reversing valve (302); The inlet of the third oil pipe (301) is located below the oil level in the oil reservoir (6), and the outlet of the first oil pipe (201) is located above the oil level in the oil reservoir (6).

2. The main transformer casing oil draining and replenishing device with sealing detection function according to claim 1 is characterized in that: The portion of the second oil pipe (202) extending into the oil reservoir (6) is provided with a spiral elastic section (2021); the oil reservoir (6) is provided with a floating member (601) floating on the oil surface; a filter (7) is provided below the floating member (601); and the second oil pipe (202) is connected to the filter (7).

3. The main transformer casing oil draining and replenishing device with sealing detection function according to claim 2 is characterized in that: The inner bottom surface of the oil reservoir (6) is provided with a collecting groove (602), and the inner part of the oil reservoir (6) is provided with a guide column (603) passing through the floating member (601), and when the floating member (601) descends, the guide column (603) guides the filter (7) to enter the collecting groove (602).

4. The main transformer casing oil draining and replenishing device with sealing detection function according to claim 2 is characterized in that: A connecting ring (605) is provided below the floating member (601), and the filter (7) comprises a shell (701). A plug hole (702) threadedly connected to the connecting ring (605) is provided on the top of the shell (701). The second oil pipe (202) passes through the floating member (601) and the plug hole (702) and is then inserted into the shell (701). Filter holes are provided on the side and bottom of the shell (701), and a filter element (703) covering the filter holes is provided inside the shell (701).

5. The main transformer casing oil draining and replenishing device with sealing detection function according to claim 4 is characterized in that: The top of the housing (701) is provided with a sealing ring (704) which abuts against the bottom surface of the floating member (601).

6. The main transformer casing oil draining and replenishing device with sealing detection function according to claim 2 is characterized in that: The opening of the oil reservoir (6) is provided with a blocking cover (604), and the blocking cover (604) is fixedly connected to the second oil pipe (202).

7. The main transformer casing oil draining and replenishing device with sealing detection function according to claim 1 is characterized in that: A top groove (303) is provided at the top of the storage oil tank (3), the top end of the first oil pipe (201) extends into the top groove (303), the first oil pipe (201) is sleeved with a floating seal (8), the floating seal (8) comprises a floating base (801), the floating base (801) is provided with a sealing sleeve (802) inserted between the top groove (303) and the first oil pipe (201), and the sealing sleeve (802) is provided with a guiding inclined surface (803).

8. The main transformer casing oil draining and replenishing device with sealing detection function according to claim 1 is characterized in that: The oil drain and replenishment machine (2) is provided with a storage battery for supplying energy, and the oil drain and replenishment nozzle (101) is provided with a ball valve (102).

9. A detection method, characterized in that: The main transformer casing oil draining and replenishing device with sealing detection function as claimed in any one of claims 1 to 8 further comprises a method: Prepare the oil drain and replenishment machine (2), the oil storage tank (3) and the oil reservoir (6), connect the first oil pipe (201), the second oil pipe (202) and the third oil pipe (301), and connect the third oil pipe (301) to the oil drain and replenishment nozzle (101); After the reversing valve (302) is adjusted to the oil replenishing direction, the oil discharging and replenishing machine (2) is started to deliver the oil in the oil reservoir (6) into the casing body (1). After the oil replenishing is completed, the reversing valve (302) is closed to stabilize the pressure. After 30 seconds, the pressure value of the pressure gauge (5) is observed; If the seal is poor according to the pressure value of the pressure gauge (5), the casing body (1) is repaired; if the seal is intact according to the pressure value of the pressure gauge (5), the third oil pipe (301) is disassembled to complete the oil replenishment and seal detection; After the reversing valve (302) is adjusted to the oil discharge direction, the oil discharge and replenishing machine (2) is started to pump the oil storage tank (3) to a negative pressure state, and the oil in the casing body (1) is discharged into the oil storage tank (3). After the oil discharge is completed, the reversing valve (302) is closed to stabilize the pressure, and the pressure value of the pressure gauge (5) is observed after 30 seconds; If the seal is poor according to the pressure value of the pressure gauge (5), the casing body (1) is repaired; if the seal is intact according to the pressure value of the pressure gauge (5), the third oil pipe (301) is disassembled to complete the oil discharge and seal detection.

10. The detection method according to claim 9, characterized in that: Before disassembling the third oil pipe (301), the ball valve (102) of the oil drain and replenishment nozzle (101) is closed. After disassembling the third oil pipe (301), the oil leakage from the oil drain and replenishment nozzle (101) is cleaned.

Images