Vacuum oil pumping system for substation maintenance

Abstract

The present application relates to a kind of vacuum oil pumping system for substation maintenance operation, comprising: transformer, vacuum oil filter, oil tank, controller and buffer tank;Buffer tank is communicated transformer load regulating switch oil pillow breathing port by second pipeline, second electromagnetic valve, is communicated transformer body oil pillow capsule internal breathing port by third pipeline, third electromagnetic valve, is communicated transformer body oil pillow injection and discharge port by sixth pipeline, sixth electromagnetic valve, is communicated vacuum oil filter vacuum port by seventh pipeline, seventh electromagnetic valve;Vacuum oil filter oil inlet is communicated with oil tank by ninth pipeline, and vacuum oil filter oil outlet is communicated with transformer oil injection port by tenth pipeline;Controller is used to control each electromagnetic valve opening or closing.

Description

TECHNICAL FIELD

[0001] The present application relates to a vacuum oil pumping system for transformer maintenance operation, belonging to the field of transformer vacuum oil injection. BACKGROUND

[0002] When the transformer internal fault occurs, the transformer oil needs to be discharged for fault treatment. After the fault treatment is completed, the vacuum oil injection is carried out according to the maintenance standard. In the existing transformer vacuum oil pumping system, the buffer tank is used as a container, which is usually provided with two interfaces, one of which is connected with the vacuum oil filter machine, and the other is connected with the maintenance equipment to realize the vacuum pumping of the maintenance equipment. During the pumping and injection process, it is usually operated by manpower, and the degree of automation needs to be further improved.

[0003] In addition, as shown in the prior art, Figures 4-5 The on-load tap changer of the transformer is fixed on the transformer body, and has an independent oil chamber. The transformer body oil and the oil in the on-load tap changer oil chamber are not communicated. As shown in the prior art, Figure 6 The top of the on-load tap changer is provided with a top cover C, a relay elbow pipe R, an oil suction elbow pipe S, an oil injection elbow pipe Q and a bypass pipe E. The lower part of the bypass pipe E is communicated with the transformer body, and the oil suction elbow pipe S and the oil injection elbow pipe Q are communicated with the on-load tap changer oil chamber. In the vacuum pumping link of the transformer maintenance, the on-load tap changer oil chamber cannot withstand the pressure, so a communication plate needs to be installed between Q and E to make the two air chambers communicate and have consistent pressure, and then vacuum pumping is carried out. After vacuum pumping, oil is injected into the transformer body oil chamber, and the injection needs to be stopped when the oil reaches a position 200 mm below the top of the transformer body. After breaking the vacuum, the communication plate needs to be removed. If the communication plate is not removed and the oil injection is continued, the oil will flow to the on-load tap changer oil chamber through the communication plate, so that the two air chambers are communicated by oil, which is not allowed in the transformer maintenance. For example, the patent CN113963902A "Method for vacuum exhaust and oil injection of transformer" uses a special plastic transparent pipe with flanges at both ends to connect the oil inlet and outlet pipes of the body oil pillow box and the oil inlet and outlet pipes of the on-load tap changer oil pillow; for example, the patent CN112086270A "Oil-immersed transformer on-load switch pressure difference live-line oil supplement method and tool" connects the oil injection and discharge pipes of the on-load tap changer oil pillow and the main transformer oil pillow through a three-way valve oil supplement pipeline, so that the on-load tap changer oil pillow and the main transformer oil pillow are in communication condition.

[0004] The patent CN109192462B "Transformer oil injection equipment and operation method" includes a buffer tank, an oil tank, a valve group, a nitrogen cylinder and a vacuum unit. The buffer tank is connected with the upper stop valve of the transformer body through a gas guide pipe, and the oil tank is connected with the lower stop valve of the transformer body through an oil conveying pipe. The valve group is sequentially connected by valve 01, valve 02, valve 04 and valve 03. Through the operation of the valve group, the passages between the buffer tank, the nitrogen cylinder, the vacuum unit, the oil tank and the transformer are controlled, and the functions of oil discharge, exhaust, oil injection, moisture prevention and pressure release are realized. The degree of automation of this method needs to be further improved. SUMMARY

[0005] In order to overcome the problems in the prior art, the present application designs a vacuum oil pumping system for transformer maintenance operation, and sets a controller to control the closing of multiple electromagnetic valves of the buffer tank, thereby improving the degree of automation and reducing the workload of manual operation.

[0006] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0007] A vacuum oil pumping system for transformer maintenance operation, comprising a transformer, a vacuum oil filter, an oil tank, a controller and a buffer tank.

[0008] The buffer tank is connected to the breathing port of the oil pillow of the on-load voltage regulating switch of the transformer through a second pipeline and a second electromagnetic valve, connected to the breathing port inside the oil pillow capsule of the transformer body through a third pipeline and a third electromagnetic valve, connected to the oil injection and discharge port of the oil pillow of the transformer body through a sixth pipeline and a sixth electromagnetic valve, and connected to the vacuum pumping port of the vacuum oil filter through a seventh pipeline and a seventh electromagnetic valve.

[0009] The oil inlet of the vacuum oil filter is connected to the oil tank through a ninth pipeline, and the oil outlet of the vacuum oil filter is connected to the oil injection port of the transformer through a tenth pipeline.

[0010] The controller is used to control the opening or closing of each electromagnetic valve.

[0011] Further, a first pipeline for breaking vacuum is fixedly connected to the buffer tank, and a first electromagnetic valve is arranged on the first pipeline.

[0012] Further, it further comprises a gas permeation plug installed on the first electromagnetic valve.

[0013] Further, the buffer tank is connected to the gas interface of the transformer body through a fourth pipeline, and a fourth electromagnetic valve is arranged on the fourth pipeline.

[0014] Further, a fifth pipeline for discharging transformer oil is fixedly connected to the buffer tank, and a fifth electromagnetic valve is arranged on the fifth pipeline.

[0015] Further, the buffer tank is fixedly connected with an eighth pipeline, and a vacuum gauge is arranged on the eighth pipeline.

[0016] Further, the buffer tank is provided with a low oil level photoelectric liquid level switch and a high oil level photoelectric liquid level switch.

[0017] Further, the controller executes instructions to realize the following steps:

[0018] The second electromagnetic valve, the third electromagnetic valve, the sixth electromagnetic valve and the seventh electromagnetic valve are opened.

[0019] Obtain the real-time value of the vacuum degree in the buffer tank through the vacuum gauge;

[0020] If the action signal sent by the low oil level photoelectric liquid level switch is received, the seventh electromagnetic valve and the sixth electromagnetic valve are sequentially closed, and the first electromagnetic valve is opened.

[0021] If the real-time value of the vacuum degree reaches a predetermined threshold, the fifth electromagnetic valve is opened.

[0022] Further, the controller executes instructions to implement the following steps:

[0023] The second electromagnetic valve, the fourth electromagnetic valve, and the seventh electromagnetic valve are opened.

[0024] Obtain the real-time value of the vacuum degree in the buffer tank through the vacuum gauge;

[0025] If the action signal sent by the low oil level photoelectric liquid level switch is received, the seventh electromagnetic valve is closed, and the first electromagnetic valve is opened.

[0026] If the real-time value of the vacuum degree reaches a predetermined threshold, the fifth electromagnetic valve is opened.

[0027] Further, the controller executes instructions to implement the following steps:

[0028] The fourth electromagnetic valve and the seventh electromagnetic valve are opened.

[0029] The transformer oil enters from the seventh electromagnetic valve and is discharged from the fourth electromagnetic valve.

[0030] Compared with the prior art, the present application has the following characteristics and beneficial effects:

[0031] The controller is provided in the vacuum oil pumping and injecting system, the multiple electromagnetic valves of the buffer tank are closed, the risk of transformer oil being sucked into the vacuum oil filter is eliminated, the degree of automation is improved, and the workload of manual operation is reduced.

[0032] The buffer tank of the vacuum oil pumping and injecting system is respectively connected with the oil pillow injection and discharge port of the transformer body and the breathing port inside the capsule of the transformer body oil pillow, and the tank body communication replaces the oil pillow bypass valve, solving the difficulty of full-vacuum oil injection of the transformer without a bypass valve structure.

[0033] The buffer tank of the vacuum oil pumping and injecting system is connected with the breathing port of the oil pillow of the on-load voltage regulating switch of the transformer and the interface at the transformer body gas, and the tank body is connected instead of the connecting plate, so that the oil pumping and injecting device is realized for the transformer with the metal corrugated pipe oil storage tank structure, the oil injector body is injected, and the effective oil sealing effect is formed on the body. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 It is a schematic diagram of the vacuum oil pumping and injecting system of example one.

[0035] Figure 2 It is a schematic diagram of the vacuum oil pumping and injecting system of example three.

[0036] Figure 3 It is a schematic diagram of the buffer tank.

[0037] Figures 4-6 It is a schematic diagram of the on-load voltage regulating switch of the transformer.

[0038] In the figure: 1, base; 2, tank body; 3, controller; 4, low oil level photoelectric liquid level switch; 5, high oil level photoelectric liquid level switch; 6, audible and visual alarm; 7, first electromagnetic valve; 8, gas permeation plug; 9, second electromagnetic valve; 10, third electromagnetic valve; 11, fourth electromagnetic valve; 12, fifth electromagnetic valve; 13, sixth electromagnetic valve; 14, seventh electromagnetic valve; 15, vacuum gauge; 16, first observation window; 17, second observation window. DETAILED DESCRIPTION

[0039] The application will be described in more detail below with reference to examples.

[0040] Example one

[0041] As shown in Figure 1 and Figure 3 , a vacuum oil pumping and injecting system for transformer maintenance operation comprises a transformer, a vacuum oil filter, an oil tank, a controller and a buffer tank.

[0042] In this embodiment, the transformer is a capsule type oil storage tank structure.

[0043] The buffer tank is connected with the breathing port of the oil pillow of the on-load voltage regulating switch of the transformer through the second pipeline and the second electromagnetic valve 9, connected with the breathing port inside the oil pillow capsule of the transformer body through the third pipeline and the third electromagnetic valve 10, connected with the oil injecting and discharging port of the transformer body oil pillow through the sixth pipeline and the sixth electromagnetic valve 13, and connected with the vacuum pumping port of the vacuum oil filter through the seventh pipeline and the seventh electromagnetic valve 14.

[0044] The oil inlet of the vacuum oil filter is connected with the oil outlet of the oil tank through the ninth pipeline, and the oil outlet of the vacuum oil filter is connected with the oil injecting port of the transformer through the tenth pipeline.

[0045] The controller is used to control the opening or closing of each electromagnetic valve.

[0046] In this embodiment, for the capsule type oil storage tank structure transformer, the buffer tank is connected with the oil injection and discharge port of the transformer body oil pillow and the breathing port inside the capsule of the transformer body oil pillow respectively, the tank body communication is used to replace the bypass valve of the oil pillow, the difficulty of full vacuum oil injection of the transformer without bypass valve structure is solved; the buffer tank is connected with the oil injection and discharge port of the transformer body oil pillow and the breathing port of the oil pillow of the on-load voltage regulating switch respectively, the tank body communication is used to replace the function of the communication plate, and the above two points are used to achieve the purpose of full vacuum oil injection of the capsule type structure oil storage tank transformer without exhaust.

[0047] Embodiment two

[0048] Based on the vacuum oil pumping and injecting system described in embodiment one, a vacuum oil pumping and injecting method comprises the following steps:

[0049] The controller controls the opening of the second electromagnetic valve 9, the third electromagnetic valve 10, the sixth electromagnetic valve 13 and the seventh electromagnetic valve 14;

[0050] The vacuum oil filter starts to pump vacuum for the transformer body and the oil chamber of the on-load voltage regulating switch;

[0051] The controller obtains the real-time value of the vacuum degree in the tank body 2 through the vacuum gauge 15;

[0052] When the vacuum degree reaches the preset value of the controller, the timing starts, and after the preset time of the controller is reached, the vacuum oil filter starts to discharge oil, and the oil is injected from the bottom of the transformer;

[0053] After the oil level of the transformer rises to the bottom of the transformer oil pillow, the transformer oil enters the buffer tank from the oil injection and discharge port of the transformer body oil pillow, and when the oil level of the transformer reaches the preset liquid level, the low oil level photoelectric liquid level switch sends an action signal to the controller, and the sound and light alarm 6 is controlled to alarm and stop the oil injection of the oil filter.

[0054] After receiving the action signal, the controller controls the seventh electromagnetic valve 14 and the sixth electromagnetic valve 13 to be closed in turn, and controls the first electromagnetic valve 7 to be opened to break the vacuum.

[0055] When the real-time value of the vacuum degree reaches the predetermined threshold value, the controller controls the fifth electromagnetic valve 12 to be opened to discharge the transformer oil.

[0056] Embodiment three

[0057] As shown in Figure 2 A vacuum oil pumping and injecting system for transformer maintenance operation, comprising a transformer, a vacuum oil filter, an oil tank and a buffer tank.

[0058] In this embodiment, the transformer is a metal bellows oil conservator structure.

[0059] The buffer tank is connected to the breathing port of the oil pillow of the on-load voltage regulating switch of the transformer through the second pipeline and the second electromagnetic valve 9, and is connected to the gas interface of the transformer body through the fourth pipeline, and the fourth pipeline is provided with the fourth electromagnetic valve 11.

[0060] The oil inlet of the vacuum oil filter is connected to the oil outlet of the oil tank through the ninth pipeline, and the oil outlet of the vacuum oil filter is connected to the oil injection port of the transformer through the tenth pipeline.

[0061] In this embodiment, for the metal bellows oil conservator structure transformer, the buffer tank is connected to the breathing port of the oil pillow of the on-load voltage regulating switch of the transformer and the gas interface of the transformer body respectively, and the tank body is connected instead of the connecting plate, so that the metal bellows oil conservator structure transformer can be injected with oil to cover the body, and an effective oil sealing effect is formed on the body. At the same time, the connecting device does not need to be disassembled and assembled, and the maintenance efficiency is improved.

[0062] Embodiment four

[0063] Based on the vacuum oil pumping and injecting system in embodiment three, a vacuum oil pumping and injecting method comprises the following steps:

[0064] The controller controls the second electromagnetic valve 9, the fourth electromagnetic valve 11 and the seventh electromagnetic valve 14 to be opened;

[0065] The vacuum oil filter is started to pump vacuum to the transformer body and the oil chamber of the on-load voltage regulating switch;

[0066] The controller obtains the real-time value of the vacuum degree in the tank body 2 through the vacuum gauge 15;

[0067] When the vacuum degree reaches the preset value of the controller, the timing is started, and after the preset time of the controller is reached, the oil filter is started to inject oil from the bottom of the transformer;

[0068] After the oil level of the transformer rises, the transformer oil enters the buffer tank from the fourth electromagnetic valve 11; when the oil level reaches the preset liquid level, the low oil level photoelectric liquid level switch sends an action signal to the controller, and the sound and light alarm 6 is controlled to alarm, and the oil injection of the oil filter is stopped;

[0069] After the controller receives the action signal, the sound and light alarm 6 is controlled to alarm, the seventh electromagnetic valve 14 is controlled to be closed, and the first electromagnetic valve 7 is controlled to be opened to break the vacuum;

[0070] When the real-time value of the vacuum degree reaches the predetermined threshold value, the controller controls the fifth electromagnetic valve 12 to be opened to discharge the transformer oil in the tank.

[0071] Embodiment five

[0072] An oil filtration method includes the following steps:

[0073] The controller controls the opening of the fourth solenoid valve 11 and the seventh solenoid valve 14.

[0074] The buffer tank is used as a container, and the fourth solenoid valve 11 and the seventh solenoid valve 14 are opened and connected to the oil inlet and outlet of the oil filter, respectively.

[0075] Transformer oil enters the oil filter through the seventh solenoid valve 14 from the oil outlet of the oil filter, and exits through the fourth solenoid valve 11 to enter the oil filter through the oil inlet of the oil filter for circulation filtration.

[0076] The oil level inside the tank can be observed through observation window 16.

[0077] Example 6

[0078] like Figure 3 As shown, a multi-functional buffer tank includes:

[0079] Base 1; In this embodiment, base 1 includes three 300mm steel circular support legs.

[0080] The tank 2 is installed on the base 1; in this embodiment, the tank 2 is made of carbon steel Q235, has a cylindrical structure, and has rounded top and bottom surfaces; the tank 2 can withstand a vacuum of less than 133Pa without deformation and is welded to the base 1.

[0081] Controller 3; In this embodiment, a programmable logic controller is used;

[0082] Low oil level photoelectric liquid level switch 4 installed at the bottom of tank 2;

[0083] High oil level photoelectric liquid level switch 5 installed in the middle of tank body 2;

[0084] Several pipes are fixedly connected to the tank body; in this embodiment, each pipe is connected to the tank body 2; each solenoid valve is powered by a 220V power supply.

[0085] The first pipeline is equipped with a first solenoid valve 7 for breaking the vacuum; in this embodiment, the first solenoid valve 7 is connected to the first pipeline with a diameter of 16mm by thread, is powered by a 220V power supply, and is opened and closed by the controller 3.

[0086] The air leak plug 8 is installed on the first solenoid valve 7;

[0087] The second pipeline is connected to the breather port of the on-load tap changer oil conservator of the transformer, and a second solenoid valve 9 is provided on the second pipeline. In this embodiment, the second solenoid valve 9 is connected to the second pipeline with a diameter of 25mm by thread, is powered by 220V power supply, and is opened and closed by the controller 3.

[0088] The third pipeline is connected with the breathing port inside the oil pillow capsule of the transformer body, and a third electromagnetic valve 10 is arranged on the third pipeline; in the embodiment, the third electromagnetic valve 10 is connected to the third pipeline with a pipe diameter of 25 mm through screw threads, is powered by a 220V power supply, and is opened and closed by the controller 3;

[0089] The fourth pipeline is connected with the gas interface of the transformer body, and a fourth electromagnetic valve 11 is arranged on the fourth pipeline; in the embodiment, the fourth electromagnetic valve 11 is connected to the fourth pipeline with a pipe diameter of 50 mm through screw threads, is powered by a 220V power supply, and is opened and closed by the controller 3;

[0090] A fifth electromagnetic valve 12 for controlling the discharge of transformer oil in the tank is arranged on the fifth pipeline; in the embodiment, the fifth electromagnetic valve 12 is connected to the fifth pipeline with a pipe diameter of 16 mm through screw threads, is powered by a 220V power supply, and is opened and closed by the controller 3;

[0091] The sixth pipeline is connected with the oil injection port of the oil pillow of the transformer body, and a sixth electromagnetic valve 13 is arranged on the sixth pipeline; in the embodiment, the sixth electromagnetic valve 13 is connected to the sixth pipeline with a pipe diameter of 25 mm through screw threads, is powered by a 220V power supply, and is opened and closed by the controller 3;

[0092] The seventh pipeline is connected with the vacuum oil filter, and a seventh electromagnetic valve 14 is arranged on the seventh pipeline; in the embodiment, the seventh electromagnetic valve 14 is connected to the seventh pipeline with a pipe diameter of 50 mm through screw threads, is powered by a 220V power supply, and is opened and closed by the controller 3;

[0093] The controller 3 is used to control the opening or closing of each electromagnetic valve;

[0094] The sound-light alarm 6 is fixed on the support and is powered by a 220V power supply;

[0095] An eighth pipeline and a vacuum gauge 15 arranged on the eighth pipeline; in the embodiment, the eighth pipeline has a pipe diameter of 25 mm, and the vacuum gauge 15 is powered by a 220V power supply;

[0096] Two 100mm-diameter glass observation windows 16 and 17 are arranged on the tank body 2.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the protection scope of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should analyze that the technical solutions of the present application can be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present application.

Claims

1. A vacuum oil pumping system for substation maintenance work, characterized by, The utility model relates to a kind of transformer oil buffer tank, including: Transformer, vacuum oil filter, oil tank, controller (3) and buffer tank; The buffer tank is connected with the breathing port of transformer on-load regulating switch oil pillow by second pipeline, second electromagnetic valve (9), is connected with the breathing port inside transformer body oil pillow capsule by third pipeline, third electromagnetic valve (10), is connected with the oil injection and discharge port of transformer body oil pillow by sixth pipeline, sixth electromagnetic valve (13), is connected with the vacuum extraction port of vacuum oil filter by seventh pipeline, seventh electromagnetic valve (14); First pipeline for breaking vacuum is fixedly connected on the buffer tank, and first electromagnetic valve (7) is arranged on the first pipeline; The buffer tank is fixedly connected with eighth pipeline, and vacuum gauge (15) is arranged on the eighth pipeline; The buffer tank is equipped with low oil level photoelectric liquid level switch (4) and high oil level photoelectric liquid level switch (5); The oil inlet of the vacuum oil filter is connected with the oil tank by ninth pipeline, and the oil outlet of the vacuum oil filter is connected with the oil injection port of the transformer by tenth pipeline; The controller (3) is used for controlling the opening or closing of each electromagnetic valve. The controller (3) executes instructions to realize the following steps: Control the opening of second electromagnetic valve (9), third electromagnetic valve (10), sixth electromagnetic valve (13) and seventh electromagnetic valve (14). Obtain the real-time value of the vacuum degree in the buffer tank by vacuum gauge (15). If the action signal sent by low oil level photoelectric liquid level switch (4) is received, control seventh electromagnetic valve (14) and sixth electromagnetic valve (13) to be closed in turn, and control first electromagnetic valve (7) to be opened. If the real-time value of the vacuum degree reaches a predetermined threshold, control fifth electromagnetic valve (12) to be opened.

2. The vacuum oil pumping system for substation maintenance work according to claim 1, characterized in that, Further comprising: Gas permeation plug (8) installed on the first electromagnetic valve (7).

3. The vacuum oil pumping system for substation maintenance work according to claim 1, wherein The buffer tank is connected with the interface of transformer body gas by fourth pipeline, and fourth electromagnetic valve (11) is arranged on the fourth pipeline.

4. The vacuum oil pumping system for substation maintenance work according to claim 1, wherein The buffer tank is fixedly connected with fifth pipeline for discharging transformer oil, and fifth electromagnetic valve (12) is arranged on the fifth pipeline.

5. The vacuum oil pumping system for substation maintenance work according to claim 1, wherein The controller (3) executes instructions to realize the following steps: Control the opening of second electromagnetic valve (9), fourth electromagnetic valve (11) and seventh electromagnetic valve (14). Obtain the real-time value of the vacuum degree in the buffer tank by vacuum gauge (15). If the action signal sent by low oil level photoelectric liquid level switch (4) is received, control seventh electromagnetic valve (14) to be closed and control first electromagnetic valve (7) to be opened. If the real-time value of the vacuum degree reaches a predetermined threshold, control fifth electromagnetic valve (12) to be opened.

6. The vacuum oil pumping system for substation maintenance work according to claim 2, wherein The controller (3) executes instructions to realize the following steps: Control the opening of fourth electromagnetic valve (11) and seventh electromagnetic valve (14). Transformer oil enters from seventh electromagnetic valve (14) and is discharged from fourth electromagnetic valve (11).

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