JP2513347Y2 - Vacuum filling monitor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a vacuum oil filling monitoring device used for vacuum oil filling of a device to be filled with oil such as a terminal of a cable in oil.

(Prior Art) When the OF cable is raised and terminated inside the bushing, the inside of the bushing is filled with insulating gas or insulating oil. In the case of filling with insulating oil, the inside of the bushing is evacuated and then the insulating oil is injected.

FIG. 2 shows a schematic configuration diagram of a conventional device for filling insulating oil.

In the figure, the OF cable 2 is terminated inside the oil filling target device 1 such as a bushing, and the inside is evacuated to fill the insulating oil. In this case, this oil filling target device 1
A bottle 4 is connected to the via a suction pipe 3. The bottle 4 is for receiving the insulating oil overflowed from the device 1 to be filled with oil when filling with oil.
The four valves of the bottle 4 are connected to an intake pipe 3 that is connected to a different device 1 to be filled with oil, a vacuum pump 5 and a vacuum gauge 6. In addition, an oil filling section 8 is connected to the oil filling target device 1 via an oil filling port 7 for filling oil. The oil filling portion 8 is composed of a tank or the like filled with insulating oil for OF cable.

An automatic management unit 10 is provided in the middle of the intake pipe 3.

 FIG. 3 shows a specific structure of the bottle 4.

The bottle 4 includes a lid 45 made of an iron plate or the like and a bottom plate 46 having a similar structure, and a transparent tube made of glass, acrylic, or the like.
47 is sandwiched between them. Legs 48 are provided on the lower surface of the bottom plate 46. Further, four pipes 41, 42, 43, 44 with valves are attached to the lid 45.

At the time of vacuuming, the lid 45 and the bottom plate 46 are tightened with bolts 49, sandwiched between the transparent cylinder 47 and the lid 45, and between the transparent cylinder 47 and the bottom plate 46, by the action of packing (not shown),
The inside of the transparent cylinder 47 is made airtight.

Then, suction is performed by a vacuum pump via the valved pipe 41, and the degree of vacuum is monitored by a vacuum gauge via the valved pipe 42. The pipes 43,44 with valves are
It is connected to the equipment to be filled and used for intake. Further, after the evacuation is completed, oil filling is performed. At that time, overflowed oil flows from these pipes with valves 43 and 44 and flows into the bottle 4.

After the work is completed, the bottle 4 is disassembled and the insulating oil is removed.

 FIG. 4 shows a block diagram of the automatic management unit.

In the figure, the pipe 11 of this automatic management unit is inserted in the middle of the intake pipe 3 shown in FIG. 2, one end 11a is connected to the bottle side, and the other end 11b is connected to the oil filling target device side. A vacuum gauge 12 is attached to the pipe 11 in order to detect the degree of vacuum inside the pipe 11.
A valve 13 is inserted between the pipe 11 and the pipe 11.

An electromagnetic valve 15 is inserted in the middle of the pipe 11, and a manual valve 16 is inserted. This solenoid valve 15
In addition to being opened and closed by the switches 17a and 17b of the control panel 17, the timer 14 is controlled so as to be opened at a predetermined time, and further, the vacuum gauge 12 operates so as to be closed when the pressure falls below a predetermined pressure. It is said that.

 The above device operates as follows.

First, the valve 13 for the vacuum gauge 12 of the automatic management unit shown in FIG. 4 is opened, the switch 17a of the control panel 17 is pressed to open the solenoid valve 15, and the vacuum pump 5 shown in FIG. 2 is started. Start vacuuming the circuit.

After confirming that the degree of vacuum in the circuit has reached a predetermined value or less, the valve 16 of the pipe 11 shown in FIG. 4 is opened to start vacuuming the equipment to be filled with oil. The vacuum degree of the equipment to be filled with oil is
When reaching 76 cmHg, the contact needle of the vacuum gauge 12 is set to 65 cmHg. That is, when the vacuum degree is lower than 65 cmHg,
Set so that the solenoid valve 15 operates and closes. Then, the switch 17c for operating the automatic management unit is turned on.

Then, open the oil filler port 7 of the oil filler 8 shown in FIG.
The filling of the oil filling target device 1 is started. When the filling is completed, the overflowed oil flows into the pipe 11 of the automatic management unit 10 via the intake pipe 3. In this case, the insulating oil passes through the solenoid valve 15 and the valve 13. At this time, the degree of vacuum sharply decreases, and the solenoid valve 15 is shut off by the action of the contact needle of the vacuum gauge 12. The operator is informed of the completion of oil filling by this, presses the switch 17a, opens the solenoid valve 15 again, and after confirming that the insulating oil flows into the bottle 4, presses the switch 17b to stop the oil inflow.

After that, the fuel supply port 7 is closed, the intake pipe 3 is removed, the switch 17a of the control panel 17 is pressed to open the solenoid valve 15, and the pipe 11 and the bottle 4 are returned to atmospheric pressure. Then, the automatic management unit 10 is removed and the inflowing insulating oil is cleaned.

(Problems to be Solved by the Invention) By the way, the automatic management unit 10 having the above-described configuration needs to pass the insulating oil flowing in through the intake pipe 3,
In addition, the insulating oil remaining in the pipe 11 shown in FIG. 4 has a restriction on the installation place in order to prevent the vacuum arrival time from becoming longer and the vacuum becoming lower. That is,
The automatic management unit 10 must be placed at a position intermediate between the intake pipe and the bottle 4. This is because the insulating oil is allowed to completely flow down to the bottle 4 side so that the insulating oil does not remain in the oil supply circuit of the automatic management unit 10.

Due to the above restrictions, there is a problem that it is necessary to secure a shelf for installing the automatic management unit 10 and a predetermined installation space, and there is no freedom in workability and work place.

The present invention has been made in view of the above points, and an object thereof is to provide a vacuum oil filling monitoring device capable of arbitrarily selecting the installation location of the automatic management unit.

(Means for Solving the Problems) A vacuum oil filling monitoring device of the present invention is a bottle connected to an equipment to be filled with oil via an intake pipe, and a vacuum connected to the bottle to draw a vacuum inside the bottle. A vacuum pump that evacuates the inside of the equipment to be filled with oil via a bottle and an intake pipe, and an oil filling that supplies insulating oil to the equipment to be filled after vacuuming through the oil supply port provided in the equipment to be filled with oil. Section, a bypass pipe provided in the middle of the intake pipe, and the completion of the oil filling, which is inserted into the bypass pipe and is sensitive to the oil flow flowing through the intake pipe from the equipment to be filled with oil when the oil filling is completed. And an automatic management unit that operates.

(Operation) The device of the present invention does not directly insert the automatic management unit 10 into the refueling pipe as in the conventional case, but connects the bypass pipe to the refueling pipe and connects the automatic management unit 10 thereto.
Therefore, the insulating oil flowing from the device to be filled with oil directly flows into the bottle 4 via the intake pipe, and the automatic management unit detects the pressure drop in the intake pipe via the bypass pipe.
Notify the operator that filling is complete. This prevents the inflow of insulating oil into the automatic management unit.

(Embodiment) The present invention will be described in detail below with reference to an embodiment shown in the drawings.

FIG. 1 is a schematic configuration diagram showing an embodiment of a vacuum oil filling monitoring device of the present invention.

The device shown in the figure is described by taking as an example a bushing in which the OF cable 2 is terminated as the device 1 to be filled with oil, and many configurations are the same as those shown in FIG. Therefore, the same parts are designated by the same reference numerals.

The oil filling target device 1 is connected to the bottle 4 via the intake pipe 3.
Is connected to the bottle 4, and a vacuum pump 5 and a vacuum gauge 6 are attached to the bottle 4.
Is connected. The configuration of the bottle 4 is the same as that described above with reference to FIG.

In addition, an oil filling section 8 is connected to the oil filling target device 1 through an oil filling port 7. The oil filling section 8 is composed of a tank or the like filled with insulating oil. The fuel filler port 7 is opened and closed by a valve.

Here, in the device of the present invention, the bypass pipe 20 is connected to the intake pipe 3. The automatic management unit 10 is connected to the bypass pipe 20. The structure of the automatic management unit 10 is the same as that shown in FIG. The one end 11a of the pipe 11 shown in FIG. 4 is connected to the side of the bypass pipe 20 facing the bottle 4, and the pipe 11 shown in FIG. 4 is connected to the side of the bypass pipe 20 facing the oil filling target device 1. The other end 11b is connected.

Also, in the device of the present invention, as can be seen by comparing with the device of FIG.
It is configured to be placed on the same floor surface as the bottle 4 via.

The vacuum oil filling monitoring device of the present invention having the above configuration operates as follows.

First, as described above with reference to FIG. 2, the valve 13 and the electromagnetic valve 15 of the automatic management unit 10 are opened to activate the vacuum pump 5, and the circuit is evacuated to a predetermined vacuum degree. Then, the evacuation of the oil filling target device 1 is started. And
When the predetermined vacuum degree is reached, the contact needle of the vacuum gauge 12 is set and oil filling is started.

Oil filling is performed from the oil filling unit 8 to the oil filling target device 1 through the oil filling port 7. When the oil filling is completed, the overflowing insulating oil flows into the bottle 4 through the intake pipe 3. In this case, in the device of the present invention, when the insulating oil flowing in through the intake pipe 3 passes through the connection point with the bypass pipe 20, the degree of vacuum inside the bypass pipe 20 suddenly drops. Here, the solenoid valve 15 is closed by the action of the contact needle of the vacuum gauge 12, and at the same time, an alarm is issued to the operator. As a result, the worker knows that the oil filling is completed,
The refueling port 7 of the device 1 to be filled with oil is closed to finish refueling.

During such a series of operation, insulating oil is bypass pipe
Even when the oil filling work of the other oil filling target device 1 shown in FIG. 1 is continuously performed without flowing into the automatic management unit 10 via 20, the arrival time of the vacuum degree is reached. It does not cause any adverse effects such as lengthening and reduction in vacuum. Actually, it was confirmed by experiments that the same automatic operation is performed by using the automatic management unit which has been conventionally used as it is in the present invention.

 The present invention is not limited to the above embodiments.

The device to be filled with oil may be a cable end, a transformer, a capacitor, or other various power devices.

(Effects of the Invention) In the vacuum oil filling monitoring device of the present invention described above, the bypass pipe is provided in the intake pipe that connects the device to be filled with the bottle, and when the oil filling is completed, the oil flow that flows in through the intake pipe. It is equipped with an oil filling management unit that detects the oil filling completion and automatically monitors the oil filling completion, so there is no need to consider the residual oil and the layout of the oil filling management unit layout is eliminated. Can be freely selected. Further, since there is no residual oil, it is possible to shorten the time required to reach the degree of vacuum and prevent the degree of vacuum from decreasing.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a vacuum oil filling monitoring device of the present invention, FIG. 2 is a schematic configuration diagram of a conventional device, FIG. 3 is a front view showing a concrete example of the vacuum bottle, and FIG. It is a block diagram which shows an example of an automatic management part. 1 ... Equipment to be filled with oil, 2 ... OF cable, 3 ... Intake pipe, 4 ... Bottle, 5 ... Vacuum pump, 6 ... Vacuum gauge, 7 ... Refueling port, 8 ... Oil filling section, 10 …… Automatic management department,
20 …… Bypass pipe.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Hisashi Konuchi 2-1-1 Oda Sakae, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Showa Electric Wire & Cable Co., Ltd. (72) Yuichi Niijima, Sakae Oda, Kawasaki-ku, Kawasaki-shi, Kanagawa 2-1-1 No. 1 Showa Electric Wire & Cable Co., Ltd. (56) References

Claims (1)

(57) [Scope of utility model registration request] 1. A bottle connected to a device to be filled with oil via an intake pipe, a vacuum connected to this bottle to evacuate the inside of the bottle, and a bottle inside the device to be filled with oil via the bottle and the intake pipe. A vacuum pump for evacuating, an oil filling part for supplying insulating oil to the equipment to be filled with oil after the vacuum is drawn through an oil supply port provided to the equipment to be filled with oil, and a bypass pipe provided in the middle of the intake pipe. A vacuum which is inserted into the bypass pipe, and is provided with an automatic management unit for detecting the completion of oil filling in response to an oil flow flowing through the intake pipe from the equipment to be filled with oil when the oil filling is completed. Oil filling monitoring device.