KR20090116058A - Apparatus for removing moisture for transformer oils - Google Patents

Abstract

PURPOSE: An apparatus for removing moisture of the transformer oil is provided to prevent the shutdown of a transformer for removing the moisture of the transformer oil by operating a dehumidifier. CONSTITUTION: An apparatus for removing moisture of the transformer oil includes a dehumidifier(10) and an exchange unit. The dehumidifier removes the moisture in the transformer oil. The dehumidifier has an outer tank(12) and an inner tank(14). A transformer oil inlet(12a), a transformer oil outlet(12b), and a water collector(12c) are formed in the outer tank. The inner tank is installed inside the outer tank. A cold air inlet(14a) and a warm air outlet(14b) are formed in the inner tank. The exchange unit connects the transformer and the dehumidifier for exchanging the transformer oil between the transformer and the dehumidifier. The exchange unit includes a circulation pipe and a circulation pump. The circulation pump is connected to the transformer oil inlet and the transformer oil outlet of the outer tank. The circulation pump circulates the transformer oil inside the circulation pipe forcedly.

Description

Transformer insulating oil dehumidifier {Apparatus for removing moisture for transformer oils}

The present invention relates to a transformer insulating oil dehumidifying apparatus, and more particularly, to provide a predetermined dehumidifier for arranging an inner cylinder through which cold air flows inside an outer cylinder through which insulating oil flows to remove moisture from the insulating oil by heat exchange thereof. The present invention relates to a transformer insulating oil dehumidifying apparatus that can be connected to a transformer so as to be operated during operation of the transformer, thereby preventing a loss due to an operation stop of a transformer for insulating oil dehumidification.

In general, transformers are one of the three major installations, along with breakers and cables, for transporting power, inside which coils wrapped in iron cores are impregnated with insulating oil and are always subjected to electrical, thermal and mechanical stress during operation.

The coils are insulated with enamel varnish and are insulated with paper material between the layers, and they are all impregnated with the insulating flow rate.

In other words, the transformer inside is composed of a solid insulator and a liquid insulator.

These two types of insulation continue to deteriorate due to electrical, thermal, and mechanical stress, and if the insulation suddenly weakens at some point due to a certain factor, the transformer will fail and an accident will occur.

There are many factors that cause this failure, but the biggest factor among them is water dissolved in insulating oil.

Transformer insulators, like capacitor dielectrics, can contain bubbles and moisture even if the solid insulator is completely impregnated with the liquid insulator.

If the bubbles and moisture are ionized in the overvoltage state, the resulting dielectric loss due to the bubbles and moisture increases, and if the bubbles and water contain ionized bubbles in the actual operating state, carbonization of the insulation will cause the transformer to be operated. Efforts to remove the bubbles and moisture are absolutely necessary.

This moisture not only penetrates from the outside due to deterioration of strength → rupture → absorption of insulating oil as the conservator's “cascade” deteriorates over time, as well as internal winding parts (coating insulation, insulating tube, spacer, coil supporting insulator) or lead wire parts (coating). Insulation, support, bushing lower shield insulation), the mechanical strength is lowered by thermal deterioration, thermal and mechanical damage caused by external short circuit, partial discharge, and as a result, flammable gas is generated and the insulation is destroyed, resulting in change of dissolved gas in oil, insulation paper The degree of polymerization decreases and the mechanical strength of the insulating paper decreases.

There is no way to prevent the formation of moisture by such a complicated mechanism, so that the conventional transformer is regularly shut down and drying or filtering the insulating oil to remove the moisture.

However, since the transformer of the prior art has to stop the operation of the transformer for dehumidification of the insulating oil, it is obvious that the loss caused by the operation stops, and as a result, there is a problem that the overall work efficiency decreases.

The present invention has been made to solve the above problems, by arranging the inner cylinder through which the cold air flows inside the outer cylinder through which the insulating oil flows to provide a predetermined dehumidifier to remove the moisture of the insulating oil by heat exchange of the dehumidifier and the transformer By connecting and operating during the operation of the transformer, it is possible to prevent the loss caused by the operation stop of the transformer for dehumidifying the existing oil as a result, to provide a transformer insulating oil dehumidification device that can reduce the cost and improve the work efficiency. The purpose is.

Thus, the transformer insulating oil dehumidifier of the present invention for achieving the above object is a dehumidifier supplied with insulating oil from a transformer having an insulating oil to remove moisture dissolved in the insulating oil; And alternating current means for connecting the transformer and the dehumidifier to exchange insulating oil with each other.

In the transformer insulating oil dehumidifying apparatus according to the present invention, the dehumidifier includes: an outer cylinder having an inner inlet and an insulating inlet and an insulating outlet on the outer surface thereof and having a water collecting part at a lower end thereof; And an inner cylinder installed inside the outer cylinder and provided with a cold air inlet which is penetrated to the outside of the outer cylinder so that external cold air flows into one side thereof, and a warmth outlet that is penetrated to the outside of the outer cylinder to discharge the warm air exchanged with the insulating oil on the other side. The AC means comprises: a circulation pipe connected to the insulation inlet and the insulation outlet of the outer cylinder and connected to the transformer; And a circulation pump for forcibly circulating the insulating oil in the circulation pipe.

In the transformer insulating oil dehumidifying apparatus according to the present invention, the water collecting portion of the outer cylinder extends downwardly from the lower end of the outer cylinder again, and a water discharge valve for discharging water collected at the lower end thereof to the outside is provided. desirable.

In the transformer insulating oil dehumidifying apparatus according to the present invention, it is preferable that the lower end of the outer cylinder has an inclined surface structure inclined downward toward the water collecting portion so that water dehumidified from the insulating oil can flow smoothly into the water collecting portion.

In addition, in the transformer insulating oil dehumidifying apparatus according to the present invention, it is preferable that a dripping guide groove is further provided to allow the water condensed on the outer surface of the inner cylinder to smoothly flow down to the water collecting portion below.

In addition, in the transformer insulating oil dehumidifying apparatus according to the present invention, the drip guide groove, a plurality of vertical grooves extending upward and downward from the outer surface of the inner cylinder and are spaced at regular intervals in the width direction; And it is preferable that the connecting grooves are connected to the lower end of the vertical grooves inclined downward toward the water collecting portion.

In addition, the transformer insulating oil dehumidifying apparatus according to the present invention, the dehumidifier, the inner cylinder is empty, the outer surface is provided with an inlet to the inlet and the outer end is provided with a water collection unit; And an inner cylinder installed inside the outer cylinder and provided with a cold air inlet which is penetrated to the outside of the outer cylinder so that external cold air flows on one side thereof, and a warm air outlet which is penetrated to the outside of the outer cylinder to discharge the warm air exchanged with the insulating oil on the other side thereof. The AC means is a piston pump which connects the insulated outlet of the outer cylinder and the transformer, but vacuums the insulating oil of the transformer and supplies it to the dehumidifier, and vacuums the insulating oil dehumidified from the dehumidifier and returns it to the transformer. It is preferable.

In addition, in the transformer insulating oil dehumidifying apparatus according to the present invention, the water collecting portion of the outer cylinder extends downward again from the lower end of the outer cylinder, the water discharge valve for discharging the water collected at the lower end is provided It is preferable that a stop valve is further provided to prevent the water collected above the water discharge valve from flowing upward.

In the transformer insulating oil dehumidifying apparatus according to the present invention, it is preferable that the lower end of the outer cylinder has an inclined surface structure inclined downward toward the water collecting portion so that water dehumidified from the insulating oil can flow smoothly into the water collecting portion.

In addition, in the transformer insulating oil dehumidifying apparatus according to the present invention, it is preferable that a dripping guide groove is further provided to allow the water condensed on the outer surface of the inner cylinder to smoothly flow down to the water collecting portion below.

In addition, in the transformer insulating oil dehumidifying apparatus according to the present invention, the drip guide groove, a plurality of vertical grooves extending upward and downward from the outer surface of the inner cylinder and are spaced at regular intervals in the width direction; And connecting the lower end of the vertical groove is preferably made of a connection groove inclined downward toward the water collecting portion.

In the transformer insulating oil dehumidifying apparatus according to the present invention, the piston pump is composed of a hollow cylinder, a piston disposed in close contact with the cylinder, and a piston rod for reciprocating the piston. A transformer connecting pipe for connecting and a dehumidifier connecting pipe for connecting a cylinder and a dehumidifier are respectively provided, and first and second opening and closing valves are provided on the respective connecting pipes, respectively, and the first and second opening and closing valves and the cylinder and the second opening and closing are respectively provided. It is preferable that a vacuum coke is provided between the valve and the dehumidifier to discharge the air in each connection pipe to the outside to make the vacuum.

In addition, the transformer insulating oil dehumidifying apparatus of the present invention is installed on a circulating pipe connecting the transformer having the insulating oil and the dissolved gas analyzer for analyzing the dissolved gas of the insulating oil in the transformer to remove water dissolved in the insulating oil of the transformer circulated. Dehumidifier is provided, the dehumidifier, the inner cylinder is empty and the outer surface is provided with an insulation inlet and an insulation outlet, respectively, the outer cylinder is provided with a water collecting portion at the bottom; And an inner cylinder installed inside the outer cylinder and provided with a cold air inlet which is penetrated to the outside of the outer cylinder so that external cold air flows into one side thereof, and a warm air outlet that is penetrated to the outside of the outer cylinder to discharge the warm air exchanged with the insulating oil on the other side thereof. It is preferable to be configured.

In the transformer insulating oil dehumidifying apparatus according to the present invention, the water collecting portion of the outer cylinder extends downwardly from the lower end of the outer cylinder again, and a water discharge valve for discharging water collected at the lower end thereof to the outside is provided. desirable.

In the transformer insulating oil dehumidifying apparatus according to the present invention, it is preferable that the lower end of the outer cylinder has an inclined surface structure inclined downward toward the water collecting portion so that water dehumidified from the insulating oil can flow smoothly into the water collecting portion.

In addition, in the transformer insulating oil dehumidifying apparatus according to the present invention, it is preferable that a dripping guide groove is further provided to allow the water condensed on the outer surface of the inner cylinder to smoothly flow down to the water collecting portion below.

In addition, in the transformer insulating oil dehumidifying apparatus according to the present invention, the drip guide groove, a plurality of vertical grooves extending upward and downward from the outer surface of the inner cylinder and are spaced at regular intervals in the width direction; And connecting the lower end of the vertical groove is preferably made of a connection groove inclined downward toward the water collecting portion.

As described above, the transformer insulating oil dehumidifier of the present invention is provided with a predetermined dehumidifier to remove moisture from the insulating oil by arranging an inner cylinder through which cold air flows inside the outer cylinder through which the insulating oil flows. By connecting and operating during the operation of the transformer, it is possible to prevent the loss caused by the operation stop of the transformer for dehumidifying the existing oil as a result, it is possible to reduce the cost and improve the work efficiency.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

1 to 3, the transformer insulating oil dehumidifying apparatus according to the first embodiment of the present invention receives the insulating oil from the transformer 3 having the insulating oil to remove the moisture dissolved in the insulating oil (10) And alternating current means for connecting the transformer 3 and the dehumidifier 10 to exchange insulating oil with each other.

The dehumidifier 10 has a hollow tank-shaped outer cylinder 12 having an inner inlet and an inlet 12a and an outlet 12b on the outer surface thereof, and having a water collecting portion 12c at a lower end thereof. It is installed inside the outer cylinder 12 and a cold air (cold water) inlet 14a penetrated to the outside of the outer cylinder 12 is provided on one side thereof so that external cold air flows therein, and on the other side of the outer cylinder 12 to discharge the warm air exchanged with the insulating oil. 12) It consists of the structure containing the inner cylinder 14 of the closed tank shape provided with the warmth (hot water) discharge port 14b which penetrated to the exterior.

Here, the outer cylinder 12 is made of a material such as a transparent synthetic resin so that the flow of the insulating oil and the water collected in the water collecting portion 12c with the naked eye, and the inner cylinder 14 has a good thermal conductivity and the insulating oil. It would be desirable to be made of stainless steel or the like that would prevent chemical reactions from occurring.

The water collecting part 12c of the outer cylinder 12 has a shape of the upper and lower narrow cylinders extending downward again from the lower end of the outer cylinder 12 and the tubular body is connected to the bottom of the cylinder again, and the water collected at the lower end thereof is external. A water discharge valve 12c1 for discharging the furnace is provided.

Here, the water collecting part 12c is disposed at the lowermost end of the outer cylinder 12 in consideration of the property to sink downward because the specific gravity of the collected water is higher than the insulating oil.

On the other hand, the water discharge valve (12c1) can be opened and closed by the operator's manual operation, as well as detect the weight of the collected water when the water discharge valve 12c1 is opened to a certain amount or more to automatically discharge the water to the outside It may be desirable to additionally install a separate weight sensor (not shown) and a controller (not shown) to be controlled.

The lower end of the outer cylinder 12 has an inclined surface 12d structure inclined downward toward the water collecting portion 12c so that water dehumidified from the insulating oil can flow smoothly into the water collecting portion 12c.

In the present invention, the lower end of the inner cylinder 14 also has an inclined surface structure parallel to the inclined surface 12d corresponding to the lower end inclined surface 12d of the outer cylinder 12.

In addition, the outer surface of the inner cylinder 14 is further provided with a drip guide groove 14c to allow the condensation to flow smoothly to the water collecting portion 12c below.

Here, the downfall guide groove 14c extends upward and downward from the outer surface of the inner cylinder 14, and the plurality of vertical grooves 14c1 and the lower ends of the vertical grooves 14c1 that are continuously spaced apart by a predetermined interval in the width direction. Connected but consists of a connecting groove 14c2 inclined downward toward the water collecting portion (12c).

In addition, the drip guide groove 14c is preferably such that the insulating oil molecules having a relatively high density do not penetrate, and as a result, have a fine groove structure that does not interfere with water condensation or flow.

The alternating current means is connected to the inlet 12a and the outlet 12b of the outer cylinder 12, respectively, in order to circulate the circulation pipe 20 leading to the transformer 3 and the insulation oil in the circulation pipe 20. It is configured to include a pump (30).

The transformer insulating oil dehumidifying apparatus of the first embodiment of the present invention according to this configuration provides a predetermined dehumidifier 10, but connects the dehumidifier 10 and the transformer 3 to the circulation pipe 20 and onto the circulation pipe 20. It has a series of insulating oil circulation cycle structure in which the circulation pump 30 is installed.

In this state, the circulating pump 30 is operated to circulate the insulating oil of the transformer 3 and interlock therewith to introduce predetermined cool air into the cold air inlet 14a of the inner cylinder 14 of the dehumidifier 10, and the hot air outlet of the opposite side. In the process of discharging the warmth heat exchanged with the high-temperature insulating oil through the 14b, the moisture dissolved in the insulating oil condenses on the outer surface of the inner cylinder 14, particularly the entire outer surface including the drip guide groove 14c. The water separated and thus dehumidified and separated is settled downward by the specific gravity difference and is finally collected by the water collection unit 12c provided at the bottom end of the outer cylinder 12.

Then, when the water collected in the water collecting unit 12c exceeds a certain amount of collection, the operator can visually check the collection amount and discharge the water to the outside through the water discharge valve 12c1.

Alternatively, when a separate weight sensor and a control unit are provided, water may be discharged to the outside by automatically opening and closing the water discharge valve 12c1 by automatically checking the collection amount of water even if there is no operator.

The dehumidification is performed while the insulating oil of the transformer 3 is repeatedly circulated to the dehumidifier 10 through the circulation pipe 20 and the circulation pump 30, and the dehumidified water is collected by the water collection unit 12c to the outside. The discharge process is continued for a predetermined time, so that the water dissolved in the insulating oil of the transformer 3 in operation can be completely removed.

On the other hand, as shown in Figures 4 to 8, the transformer insulating oil dehumidifying apparatus according to the second embodiment of the present invention is a dehumidifier that receives the insulating oil from the transformer 3 having the insulating oil to remove the water dissolved in the insulating oil ( 40) and the transformer 3 and the dehumidifier 40 is configured to include an alternating current means to exchange the insulating oil with each other.

The dehumidifier 40 has an inner flow opening 42 and an outer cylinder 42 of a closed tank structure having a water collection part 42b at a lower end thereof, and having an insulating outlet 42a on an outer surface thereof. A cold air inlet 44a is installed and penetrated outside the outer cylinder 42 so that external cold air flows into one side thereof, and a warm air outlet penetrated outside the outer cylinder 42 so that the warmth of heat exchanged with insulating oil is discharged to the other side thereof. The inner cylinder 44 of the closed tank structure provided with 44b) is comprised.

Also in this second embodiment, the outer cylinder 42 is made of a transparent synthetic resin or the like to visually check the flow of the insulating oil and the water collected in the water collecting portion 42b, and the inner cylinder 44 has a thermal conductivity It may be desirable to be made of a stainless steel material or the like which prevents chemical reactions from occurring by the insulating oil.

The water collecting portion 42b of the outer cylinder 42 has a shape of the upper and lower narrow cylinders extending downward again from the lower end of the outer cylinder 42 and a tubular body connected to the bottom of the cylinder again, and collects the water collected at the lower end thereof. A water discharge valve 42b1 for discharging to the outside is provided, and a stop valve 42b2 is further provided above the water discharge valve 42b1 to prevent the collected water from flowing back upward.

The lower end portion of the outer cylinder 42 has an inclined surface 42c inclined downward toward the water collecting portion 42b so that water dehumidified from the insulating oil can flow smoothly into the water collecting portion 42b. .

In the present invention, the lower end of the inner cylinder 44 also has an inclined surface structure parallel to the inclined surface 42c corresponding to the lower end inclined surface 42c of the outer cylinder 42.

And, the outer surface of the inner cylinder 44 is further provided with a dripping guide groove 44c to allow the condensed water to flow smoothly to the water collecting portion 42b below.

Here, the downfall guide groove (44c) of the plurality of vertical grooves (44c1) and the vertical grooves (44c1) extending upward and downward from the outer surface of the inner cylinder 44 and spaced apart at regular intervals in the width direction It is connected to the lower end portion consists of a connection groove 44c2 inclined downward toward the water collecting portion (42b).

Here, the dripping guide groove 44c may have a groove structure that is fine enough to prevent the insulated oil molecules having a relatively high density from invading and consequently do not interfere with condensation or flow of water molecules.

The AC means is connected to the insulating outlet 42a and the transformer 3 of the outer cylinder 42, while vacuuming the insulating oil of the transformer 3 to supply it to the dehumidifier 40, and dehumidified from the dehumidifier 40. It is a piston pump 50 which vacuum-insulates insulating oil and returns it to the transformer 3 again.

Here, the piston pump 50 is composed of a cylinder 51 having an empty inside, a piston 52 disposed in close contact with the cylinder 51 and a piston rod 53 for reciprocating the piston 52. However, a transformer connecting pipe 54 for connecting the cylinder 51 and the transformer 3 and a dehumidifier connecting pipe 55 for connecting the cylinder 51 and the dehumidifier 40 are respectively provided, and each of the connecting pipes ( 54 and 55, first and second open and close valves 54a and 55a are provided, respectively, and the first and second open and close valves 54a and 55a, the cylinder 51, and the second open and close valve 55a and the dehumidifier ( 40 is provided with vacuum cocks 54b, 55b and 55c, respectively, for discharging the air in each of the connecting pipes 54 and 55 to the outside to make the vacuum.

Transformer insulation oil dehumidifying apparatus of a second embodiment of the present invention according to this configuration is provided with a predetermined dehumidifier 40, the piston pump 50 is interposed between the dehumidifier 40 and the transformer (3) and then each of them The transformer connecting pipe 54 and the dehumidifier connecting pipe 55 is structured.

In this state, first, the respective portions of the transformer connection tube 54 and the corresponding portion of the dehumidifier connection tube 55 and the inside of the outer cylinder 42 are vacuumed through the respective vacuum cocks 54b, 55b, and 55c. Cold air is introduced through the inlet port 44a to make the inner cylinder 44 cold in advance.

Then, as the first operation, the first opening and closing valve 54a and the second opening and closing valve 55a are closed, and the piston rod 53 is pulled to introduce the insulating oil of the transformer 3 into the cylinder 51.

At this time, the insulating oil flowing into the cylinder 51 is preferably introduced in consideration of the capacity of the outer cylinder (42).

Then, as a second operation, the first opening / closing valve 54a is closed and the second opening / closing valve 55a is opened. On the contrary, the insulating oil in the cylinder 51 is pushed back to the outer cylinder of the dehumidifier 40 by pushing the piston rod 53 to its original state. 42) Enter inside.

Then, dehumidification of the insulating oil is performed on the outer surface of the inner cylinder 44 cooled by the cold air after a predetermined time.

Here, the water droplets generated by dehumidification sinks downward due to the specific gravity difference or is finally collected in the water collecting part 42b by the drip guide groove 44c of the inner cylinder 44 and the water discharge valve 42b1 is opened. It is discharged to the outside through.

When the dehumidification of the insulating oil is completed in this way, the first opening and closing valve (54a) is closed and the second opening and closing valve (55a) in the open state to pull the piston rod 53 again the insulating oil completed dehumidification in the outer cylinder 42 cylinder (51) flows into the interior.

At this time, the water in the water collecting part 42b is prevented from flowing back by the stop valve 42b2 while the insulating oil is sucked into the cylinder 51.

Then, the first opening / closing valve 54a is opened and the second opening / closing valve 55a is closed. On the contrary, the piston rod 53 is pushed back to its original state so that the insulating oil in the cylinder 51 is returned to the transformer 3 again. The dehumidification work is completed.

This process is repeated periodically to remove the water dissolved in the insulating oil in the transformer (3).

On the other hand, Figure 9 is a transformer insulating oil dehumidifying apparatus according to a third embodiment of the present invention, a transformer 3 having insulating oil and a conventional dissolved gas analyzer (5) for analyzing the dissolved gas of the insulating oil in the transformer (3) The dehumidifier 10 of the first embodiment on the circulation pipe (7) connecting the is shown a cycle further configured.

Here, the repeated description of the dehumidifier 10 is omitted, and in such a structure, the dehumidifier 10 may be installed by additionally installing the dehumidifier 10 without the need for a separate AC means, that is, a circulation pipe or a circulation pump.

1 is a schematic perspective view showing a transformer insulating oil dehumidifying apparatus according to a first embodiment of the present invention.

Figure 2 is a schematic internal structure showing a transformer insulating oil dehumidifying apparatus according to a first embodiment of the present invention.

3 is a schematic circuit diagram illustrating a state in which a transformer insulating oil dehumidifying apparatus according to a first embodiment of the present invention is connected to a transformer.

 4 to 8 illustrate a state in which a transformer insulating oil dehumidifying apparatus according to a second embodiment of the present invention is connected to a transformer.

4 is a schematic diagram showing a state in which the insulating oil of the transformer is vacuum sucked into the cylinder,

5 is a schematic view showing a state in which the insulating oil of the transformer is sucked into the cylinder by the piston rod,

6 is a schematic view showing a state in which the insulating oil of the cylinder is introduced into the dehumidifier vacuum and dehumidified,

7 is a schematic view showing a state in which the insulating oil of the dehumidifier is completed dehumidification vacuum suction back to the cylinder,

8 is a schematic view showing a state in which the insulating oil of the cylinder having been dehumidified is returned to the transformer.

9 is a schematic circuit diagram illustrating a state in which a transformer insulating oil dehumidifying apparatus according to a third embodiment of the present invention is connected to a transformer.

** Description of the symbols for the main parts of the drawings **

3: transformer 5: dissolved multiple gas analyzer

7: circulation pipe 10: dehumidifier

12: outer cylinder 12a: insulation inlet

12b: Insulation outlet 12c: Water collecting part

12c1: Water discharge valve 12d: Inclined surface

14: inner cylinder 14a: cold air inlet

14b: Warmer outlet 14c: Falling water guide home

14c1: vertical groove 14c2: connection groove (groove where water flows down)

20: circulation pipe 30: circulation pump

40: dehumidifier 42: outer cylinder

42a: Insulation outlet 42b: Water collecting part

42b1: Water discharge valve 42b2: Stop valve

42c: slope 44: inner cylinder

44a: cold air inlet 44b: warmth outlet

44c: Falling groove 44c1: Vertical groove

44c2: Connecting groove (groove where water gathers and flows down) 50: Piston pump

51: cylinder 52: piston

53: piston rod 54: transformer connector

54a: on-off valve 54b: vacuum cock

55: dehumidifier connection pipe 55a: on-off valve

55b, 55c: Vacuum Coke

Claims (17)

Dehumidifiers (10, 40) for receiving the insulating oil from the transformer (3) having an insulating oil to remove the water dissolved in the insulating oil; And AC means for connecting the transformer (3) and the dehumidifier (10, 40) to exchange insulating oil with each other; Transformer insulating oil dehumidifier configured to include. The method of claim 1, The dehumidifier 10, An outer cylinder 12 having an empty inside and an insulating inlet 12a and an insulating outlet 12b respectively provided on the outer side thereof, and having a water collecting part 12c at a lower end thereof; And The outer cylinder 12 is installed inside the outer cylinder 12 and is provided with a cold air inlet 14a penetrated to the outside of the outer cylinder 12 so that external cold air flows into one side thereof, and the warm air heat-exchanged with the insulating oil is discharged to the other side thereof. An inner cylinder 14 provided with a warmth outlet 14b penetrated to the outside; It is configured to include, The AC means, A circulation pipe 20 connected to the inlet 12a and the outlet 12b of the outer cylinder 12 and connected to the transformer 3, respectively; And A circulation pump 30 for forcibly circulating the insulating oil in the circulation pipe 20; Transformer insulating oil dehumidifier characterized in that it comprises a. The method of claim 2, The water collecting portion 12c of the outer cylinder 12 has a shape extending downward from the lower end of the outer cylinder 12 again, and a water discharge valve 12c1 for discharging water collected at the lower end thereof to the outside is provided. Transformer insulating oil dehumidifier. The method of claim 2, The lower end of the outer cylinder 12 is characterized in that the inclined surface 12d structure inclined downward toward the water collecting portion 12c so that the water dehumidified from the insulating oil flows smoothly into the water collecting portion 12c. Transformer insulating oil dehumidifier. The method of claim 2, Transformer insulation oil dehumidifier characterized in that the condensation guide groove (14c) is further provided to allow the water condensation on the outer surface of the inner cylinder (14) to smoothly flow down to the water collecting portion (12c) below. The method of claim 5, The downfall guide groove 14c, A plurality of vertical grooves 14c1 extending upward and downward from the outer surface of the inner cylinder 14 and continuously spaced apart at regular intervals in the width direction; And A connection groove 14c2 which connects lower ends of the vertical grooves 14c1 but slopes downward toward the water collecting unit 12c; Transformer insulating oil dehumidifier, characterized in that consisting of. The method of claim 1, The dehumidifier 40, An outer cylinder 42 having an empty inside and an insulating outlet 42a provided at an outer side thereof and having a water collecting part 42b at a lower end thereof; And The outer cylinder 42 is installed inside the outer cylinder 42 and is provided with a cold air inlet 44a penetrated to the outside of the outer cylinder 42 so that external cold air flows on one side thereof, and discharges warm air exchanged with insulating oil on the other side thereof. An inner cylinder 44 having a warmth outlet 44b penetrated to the outside; It is configured to include, The AC means, The insulating outlet 42a of the outer cylinder 42 and the transformer 3 are connected to each other, and the insulating oil of the transformer 3 is sucked under vacuum to be supplied to the dehumidifier 40, and at the same time, the insulating oil dehumidified from the dehumidifier 40 is vacuum sucked. Transformer insulation oil dehumidifier, characterized in that the piston pump (50) to return to the transformer (3) again. The method of claim 7, wherein The water collecting portion 42b of the outer cylinder 42 extends downward from the lower end of the outer cylinder 42 again, and a water discharge valve 42b1 for discharging water collected at the lower end thereof to the outside is provided. And a stop valve (42b2) for preventing the water collected above the water discharge valve (42b1) from flowing upward. The method of claim 7, wherein The lower end of the outer cylinder 42 is characterized by the inclined surface 42c structure inclined downward toward the water collecting portion 42b so that the water dehumidified from the insulating oil can flow smoothly into the water collecting portion 42b. Transformer insulating oil dehumidifier. The method of claim 7, wherein Transformer insulation oil dehumidifier, characterized in that the dropping guide groove (44c) is further provided to allow the water condensation on the outer surface of the inner cylinder 44 to smoothly flow down to the water collecting portion (42b) of the lower side. The method of claim 10, The downfall guide groove 44c, A plurality of vertical grooves 44c1 extending upward and downward from the outer surface of the inner cylinder 44 and continuously spaced apart at regular intervals in the width direction; And A connection groove 44c2 which connects lower ends of the vertical grooves 44c1 but inclines downward toward the water collecting part 42b; Transformer insulating oil dehumidifier, characterized in that consisting of. The method of claim 7, wherein The piston pump 50, It consists of a cylinder 51 which is empty inside, a piston 52 closely arranged in the cylinder 51 and a piston rod 53 for reciprocating the piston 52, A transformer connecting pipe 54 connecting the cylinder 51 and the transformer 3 and a dehumidifier connecting pipe 55 connecting the cylinder 51 and the dehumidifier 40 are provided, respectively. First and second open / close valves 54a and 55a are provided on the connecting pipes 54 and 55, respectively, and the first and second open / close valves 54a and 55a and the cylinder 51 and the second open / close valves ( Transformer insulation oil dehumidifier is provided between the 55a) and the dehumidifier 40 is provided with vacuum cocks (54b, 55b, 55c) for discharging the air in each of the connecting pipes (54, 55) to make a vacuum . It is dissolved in the insulating oil of the transformer (3) installed on the circulation pipe (7) connecting the transformer (3) having insulating oil and the dissolved gas analyzer (5) for analyzing the dissolved gas of the insulating oil in the transformer (3). Dehumidifier 10 for removing the moisture is provided, The dehumidifier 10, An outer cylinder 12 having an empty inside and an insulating inlet 12a and an insulating outlet 12b respectively provided on the outer side thereof, and having a water collecting part 12c at a lower end thereof; And The outer cylinder 12 is installed inside the outer cylinder 12 and is provided with a cold air inlet 14a penetrated to the outside of the outer cylinder 12 so that external cold air flows into one side thereof, and the warm air heat-exchanged with the insulating oil is discharged to the other side thereof. An inner cylinder 14 provided with a warmth outlet 14b penetrated to the outside; Transformer insulating oil dehumidifier characterized in that it comprises a. The method of claim 13, The water collecting portion 12c of the outer cylinder 12 has a shape extending downward from the lower end of the outer cylinder 12 again, and a water discharge valve 12c1 for discharging water collected at the lower end thereof to the outside is provided. Transformer insulating oil dehumidifier. The method of claim 13, The lower end of the outer cylinder 12 is characterized in that the inclined surface 12d structure inclined downward toward the water collecting portion 12c so that the water dehumidified from the insulating oil flows smoothly into the water collecting portion 12c. Transformer insulating oil dehumidifier. The method of claim 13, Transformer insulation oil dehumidifier characterized in that the condensation guide groove (14c) is further provided to allow the water condensation on the outer surface of the inner cylinder (14) to smoothly flow down to the water collecting portion (12c) below. The method of claim 16, The downfall guide groove 14c, A plurality of vertical grooves 14c1 extending upward and downward from the outer surface of the inner cylinder 14 and continuously spaced apart at regular intervals in the width direction; And A connection groove 14c2 which connects lower ends of the vertical grooves 14c1 but slopes downward toward the water collecting unit 12c; Transformer insulating oil dehumidifier, characterized in that consisting of.

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