Insulating oil regeneration device

Abstract

It is also applicable to oil-filled electrical equipment that does not have a mechanism for connecting to external piping, and provides a regenerator for insulating oil that can be used even when it is not possible to secure an installation space near the oil-filled electrical equipment. 【Solution means】The regenerator A for insulating oil comprises a first pipe 2 communicating with the upper part in the oil tank 1, a second pipe 4 having one end configured to be connectable / disconnectable via an opening / closing valve 3 to the first pipe 2 and the other end disposed to hang down from the upper opening of the tank 23 of the oil-filled electrical equipment into the tank 23, a fourth pipe 7 communicating between the lower part in the oil tank 1 and the oil purifier 10, and an eleventh pipe 30 having one end configured to be connectable / disconnectable to the oil purifier 10 and the other end disposed to hang down from the upper opening of the tank 23 of the oil-filled electrical equipment into the tank 23.

Description

Technical Field

[0001] The present invention relates to a method for recycling insulating oil used in oil-filled electrical equipment such as transformers.

Background Art

[0002] Conventionally, for the purpose of overhauling oil-filled electrical equipment such as transformers, a method is known in which the oil (insulating oil) in the tank of the oil-filled electrical equipment is once extracted, the electrical equipment is inspected and maintained, and then the extracted oil is purified and returned to the electrical equipment. (See Patent Document 1 below)

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

[0004] The insulating oil treatment device described in Patent Document 1 above is configured to be attached to an oil-filled transformer during on-site overhaul of the oil-filled transformer, and can treat the oil of the transformer in a sealed state without exposing it to the atmosphere, so there is no risk of air pollution, and it also contributes to shortening the inspection process of the transformer.

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the case of small oil-filled electrical equipment such as pole-mounted transformers, there are some that do not have a structure for connecting to external pipes at the lid or bottom of the tank. In that case, it becomes difficult to use the insulating oil treatment device as described in Patent Document 1 above.

[0006] Also, depending on the local situation, there may be cases where space cannot be secured for installing the insulating oil treatment device near the side of the transformer tank.

[0007] Therefore, the present invention is applicable even to oil-filled electrical equipment that does not have a mechanism for connecting to external piping, and provides a regenerator for insulating oil that can be used even when it is not possible to secure a space for installing an oil purification device near the oil-filled electrical equipment.

Means for Solving the Problems

[0008] The invention according to claim 1 is a regenerator for insulating oil that takes out the insulating oil in the tank of oil-filled electrical equipment, removes moisture and decomposition gas in the oil tank, purifies the oil with an oil purifier, and then returns it to the tank of the oil-filled electrical equipment again. In the regenerator, a first pipe communicating with the upper part in the oil tank, a second pipe having one end configured to be connectable / disconnectable to the first pipe and the other end hanging down into the tank from the upper opening of the tank of the oil-filled electrical equipment, a fourth pipe communicating between the lower part in the oil tank and the oil purifier, and an eleventh pipe having one end configured to be connectable / disconnectable to the oil purifier and the other end hanging down into the tank from the upper opening of the tank of the oil-filled electrical equipment.

[0009] The invention according to claim 2 is a regenerator for insulating oil according to claim 1, characterized in that the second pipe and the fourth pipe can be shared.

[0010] The invention according to claim 3 is a regenerator for insulating oil according to any one of claim 1 or claim 2, comprising a first pump for moving the insulating oil from the oil-filled electrical equipment to the oil tank, a second pump for moving the insulating oil from the oil tank to the oil-filled electrical equipment, a control device for controlling the operation and stop of the first pump and the second pump, and an operation device connected to the control device wirelessly or by wire and transmitting an operation instruction to the control device remotely.

Effects of the Invention

[0011] According to the invention described in claim 1, since the second pipe and the eleventh pipe are each configured to be connectable / disconnectable to / from the first pipe and the oil purifier, the second pipe and the eleventh pipe can, by appropriately changing their lengths, change the installation location as appropriate according to the local conditions even when there is no space to install the insulating oil regeneration device near the oil-filled electrical equipment. Further, since the other ends of the second pipe and the eleventh pipe are configured to be vertically disposed into the tank from the upper opening of the tank of the oil-filled electrical equipment, there is no need to provide a mechanism for connecting to an external pipe in the oil-filled electrical equipment, and the applicable range of the insulating oil regeneration device can be expanded.

[0012] According to the invention described in claim 2, by sharing the second pipe and the eleventh pipe, the number of components can be reduced.

[0013] According to the invention described in claim 3, since the operation and stop of the first pump and the second pump can be remotely controlled, the purification process of the insulating oil can be performed while checking the internal conditions of the tank of the oil-filled electrical equipment.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0015] Embodiments of the present invention will be described with reference to FIGS. 1 to 4. FIG. 1 is a configuration diagram of an insulating oil regeneration device A (hereinafter referred to as an insulating oil regeneration device) according to the present invention. The insulating oil regeneration device A includes an oil tank 1, a first pipe 2 having one end inserted into the oil tank 1 from above the oil tank 1, and a second pipe 4 connected / disconnected via an opening / closing valve 3 to the other end of the first pipe 2. One end of a third pipe 5 is connected to the lower part of the oil tank 1, and the other end of the third pipe 5 is connected to one end of a fourth pipe 7 via an opening / closing valve 6. One end of a fifth pipe 9 is connected to the other end of the fourth pipe 7 via an opening / closing valve 8, and a purified oil machine 10 is connected to the other end of the fifth pipe 9.

[0016] A sixth pipe 11 is connected to the upper part of the oil tank 1. A seventh pipe 13 is connected to the sixth pipe 11 via an opening / closing valve 12, and a first pump 14 is installed on the seventh pipe 13. In addition, an eighth pipe 15 for returning the inside of the tank 1 to atmospheric pressure is installed on the upper part of the oil tank 1 with an opening / closing valve 16. Note that 17 is a pressure gauge for measuring the pressure inside the oil tank 1.

[0017] The purified oil machine 10 is composed of a ninth pipe 19 connected to the fifth pipe 9 via an opening / closing valve 18, a second pump 20 and a filter 21 arranged on the ninth pipe 19, and an opening / closing valve 22 connected to the end of the ninth pipe 19.

[0018] The insulating oil regeneration device A configured as described above purifies the insulating oil 24 filled in the tank 23 of an oil-filled electrical device such as a transformer, and the other end of the second pipe 4 is placed in the insulating oil 24. Inside the insulating oil 24 in the tank 23, a transformer body 25 is immersed, and the transformer body 25 is generally composed of a core 25a and a winding 25b.

[0019] The above-described first pump 14 and second pump 20 are controlled to operate and stop by a control device (not shown), and the control device is operated by an operating device connected thereto by wire or wirelessly. The on-off valves 3, 6, 8, 12, 16, 18, 22 operate in conjunction with the operation or stop of the first pump 14 and the second pump 20.

[0020] One end of a tenth pipe 26 can be connected to the on-off valve 8, and the other end of the tenth pipe 26 is placed in fresh oil (insulating oil) 29 in a fresh oil container 28.

[0021] Next, the operation of the insulating oil regeneration device A of the present invention will be described. FIG. 1 shows a state in which the lid is removed from the tank 23 of an oil-filled transformer to be purified oil, and the other end of the second pipe 4 is placed in the insulating oil 24. As the second pipe 4, a vinyl hose having high flexibility, being lightweight and inexpensive may be used, and one end thereof is connected to the first pipe 2 via an on-off valve 3. If a long vinyl hose is used for the second pipe 4, it is possible to install the insulating oil regeneration device A at a distant position even when it cannot be installed near the oil-filled transformer. In addition, since a mechanism for connecting a pipe to the tank of the oil-filled transformer becomes unnecessary, the range of electrical equipment to which the insulating oil regeneration device can be applied can be expanded.

[0022] When an operator operates an operating device (not shown) in this state, the first pump 14 is operated by a control device (not shown), and the inside of the oil tank 1 is depressurized. At this time, the on-off valve 3 is in an open state. When the inside of the oil tank 1 becomes negative pressure (vacuum state), as shown in FIG. 2, the insulating oil 24 is ejected from the inside of the tank 23 of the oil-filled transformer into the oil inlet tank 1 through the second pipe 4 and the first pipe 2. At this time, the insulating oil 24 is ejected in a shower or mist form from the tip of the first pipe 2 by a nozzle (not shown), so that moisture and decomposition gas contained in the insulating oil 24 are removed.

[0023] The insulating oil 24 in the tank 23 of the oil-filled transformer operates the first pump through its movement into the oil tank 1, so that moisture and decomposition gas are released to the outside from the oil tank 1. At this time, the pressure in the oil tank 1 is controlled by the pressure gauge 9. When the removal of moisture and decomposition gas has been sufficiently carried out, the operator operates the operating device to stop the first pump 14. Since the operating device sends a signal to a control device (not shown) either wired or wirelessly, the operator does not need to be near the oil tank 1 and can operate the operating device while checking the remaining amount of the insulating oil 24 in the tank 23 of the oil-filled transformer.

[0024] Subsequently, the on-off valve 3 is closed and the on-off valve 16 is opened to return the inside of the oil tank 1 to atmospheric pressure. At the same time, the second pipe 4 is removed from the first pipe 2, and as shown in FIG. 3, one end of the eleventh pipe 30 is connected to the ninth pipe 19 via the on-off valve 22. The other end of the eleventh pipe 30 is inserted into the tank 23 of the oil-filled transformer.

[0025] In this state, when the on-off valves 6, 8, 18, 22 are opened and the second pump 20 is operated by the operating device, the insulating oil 24 in the oil tank 1 flows into the tank 23 of the oil-filled transformer through the third pipe 5, the fourth pipe 7, the fifth pipe 9, the ninth pipe 19, and the eleventh pipe 30.

[0026] At this time, in the oil purifier 10, since the insulating oil 24 passes through the filter 21, solid components such as carbon and sludge are removed, so the insulating oil returned to the tank 23 of the oil-filled transformer is purified. FIG. 4 shows a state where the entire amount of the insulating oil 24 has been returned to the tank 23. When the insulating oil 24 has been returned to the tank 23, the operator operates the operating device to stop the second pump 20.

[0027] Also, when it is desired to increase the amount of insulating oil 24 in the tank 23, the on-off valve 8 is switched, and after shifting from the state where the fourth pipe 7 and the fifth pipe 9 communicate with each other to the state where the tenth pipe 26 and the fifth pipe 7 communicate with each other, the second pump 20 is operated, so that the new oil 29 in the new oil container 28 flows from the tenth pipe 26 to the fifth pipe 9, the ninth pipe 19, and the eleventh pipe 30, and is replenished into the tank 23 of the oil-filled transformer. Note that the new oil 29 also passes through the filter 21 of the oil purifier 10. However, since the new oil 29 does not contain solids such as carbon and sludge, it passes through the filter 21 as it is and is sent to the tank 23.

[0028] When the purification operation of the insulating oil 24 of the oil-filled transformer is completed, the eleventh pipe 30 is removed from the oil purifier 10, and the upper opening of the tank 23 is closed with a lid (not shown) to complete the operation.

[0029] In the above embodiment, the second pipe 4 and the eleventh pipe 30 are described as separate pipes, but they may share the same pipe, and it is also possible to use a lightweight and inexpensive one such as a vinyl hose.

[0030] As described above, according to the insulating oil regeneration device of the present invention, since a mechanism for connecting a pipe to the tank of the oil-filled transformer is not required, the range of electrical equipment to which the insulating oil regeneration device can be applied can be expanded.

[0031] Also, since the second or eleventh pipe to be placed in the tank of the oil-filled electrical equipment can be connected / disconnected from other pipes (the first pipe or the ninth pipe), if a long pipe with a long length dimension is used as the second or eleventh pipe, it is not necessary to install the insulating oil regeneration device near the oil-filled transformer, and the installation location can be changed according to the local situation.

[0032] Furthermore, since the second pipe and the eleventh pipe can share the same pipe, the components of the insulating oil regeneration device can be reduced. Also, if a vinyl hose is used for the shared pipe, not only is it easy to handle, but it can also be configured at low cost.

[0033] In addition, since the first pump, the second pump, and the on-off valve can be remotely operated by an operating device, an operator does not need to be near the oil tank and can, for example, operate while checking the situation inside the tank of an oil-filled transformer.

Industrial Applicability

[0034] It can be applied to the regeneration of insulating oil used in oil-filled electrical equipment such as transformers.

Explanation of Signs

[0035] 1 Oil tank 2 First pipe 3, 6, 8, 12, 16, 18, 22 On-off valve 4 Second pipe 5 Third pipe 7 Fourth pipe 9 Fifth pipe 10 Oil purifier 11 Sixth pipe 13 Seventh pipe 14 First pump 15 Eighth pipe 17 Pressure gauge 19 Ninth pipe 20 Second pump 21 Filter 23 Tank of oil-filled transformer 24 Insulating oil 25 Transformer body 25a Core 25b Coil 26 Tenth pipe 28 New oil container 29 New oil (insulating oil) 30 Eleventh pipe A Insulating oil regeneration device

Claims

1. An insulating oil regeneration device that removes insulating oil from a tank of an oil-filled electrical equipment, removes moisture and decomposed gases in the oil tank, purifies the oil in an oil purifier, and then returns the oil to the tank of the oil-filled electrical equipment, characterized in that the device comprises a first pipe that communicates with the upper part of the oil tank, a second pipe that is configured so that one end can be connected / disconnected to the first pipe and has the other end suspended from the upper opening of the tank of the oil-filled electrical equipment into the tank, a fourth pipe that communicates between the lower part of the oil tank and the oil purifier, and an eleventh pipe that is configured so that one end can be connected / disconnected to the oil purifier and the other end suspended from the upper opening of the tank of the oil-filled electrical equipment into the tank.

2. 2. The insulating oil regeneration device according to claim 1, wherein the second pipe and the eleventh pipe can be shared.

3. An insulating oil regeneration device as described in either claim 1 or claim 2, characterized in that it is configured to include a first pump that moves insulating oil from the oil-filled electrical equipment to an oil tank, a second pump that moves insulating oil from the oil tank to the oil-filled electrical equipment, a control device that controls the operation and stop of the first pump and the second pump, and an operating device that is connected to the control device wirelessly or by wire and transmits operating instructions to the control device remotely.

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