KR20130071622A - Insulating oil filtering apparatus for on load tap changer - Google Patents

Insulating oil filtering apparatus for on load tap changer Download PDF

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Publication number
KR20130071622A
KR20130071622A KR1020110138929A KR20110138929A KR20130071622A KR 20130071622 A KR20130071622 A KR 20130071622A KR 1020110138929 A KR1020110138929 A KR 1020110138929A KR 20110138929 A KR20110138929 A KR 20110138929A KR 20130071622 A KR20130071622 A KR 20130071622A
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KR
South Korea
Prior art keywords
oil
housing
insulating oil
filter device
insulating
Prior art date
Application number
KR1020110138929A
Other languages
Korean (ko)
Inventor
정영환
김태한
진명진
김진국
Original Assignee
주식회사 효성
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 주식회사 효성 filed Critical 주식회사 효성
Priority to KR1020110138929A priority Critical patent/KR20130071622A/en
Publication of KR20130071622A publication Critical patent/KR20130071622A/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/02—Casings
    • H01F27/04—Leading of conductors or axles through casings, e.g. for tap-changing arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/08—Cooling; Ventilating
    • H01F27/10—Liquid cooling
    • H01F27/12—Oil cooling

Abstract

PURPOSE: An insulating oil filtering device for tab changer part is provided to minimize a malfunction from the compression and expansion of bubble by preventing the compression of bubble inside the housing. CONSTITUTION: A housing (10) has an internal space (12) in the inside. A filter (20) which filters a foreign substance from insulating oil is installed in the internal space. An oil induction pipe (14) supplies the insulating oil to the inside of housing. An oil discharge pipe (16) discharges the insulating oil of the housing. An oil pump (18) pressurizes the insulating oil of the internal space.

Description

Insulating oil filtering apparatus for on-load tap changer

The present invention relates to an insulating oil filter device for a tap-changing part, and more particularly, to an insulating oil filter device for a tap-changing part that filters bubbles and foreign substances mixed in the insulating oil used in the tap-changing part.

In the transformer, an on load tap changer is used. Since the insulating oil is contaminated by an arc generated during the tap switching, the filter is filtered using an insulating oil filter device. To this end, after the tap-changing operation is completed, the pump of the insulating oil filter device operates to suck the contaminated insulating oil in the tap-changing part into the inside of the filter device through the oil suction pipe, filter the contaminants through the filter, and then discharge the oil discharge pipe. Send it back through the tap-changer.

In the tap-changer system, when an accident occurs inside, the flow velocity is generated toward the conservator. At this time, a protective relay installed between the conservator and the tap-changer is operated to report the tap-changer. However, even when there is no accident in the tap-changer system, a flow rate occurs toward the conservator and frequently causes a malfunction in which the protective relay operates. This is caused by bubble accumulation inside the insulating oil filter device and blockage of the piping.

In addition, bubbles are generated by the arc at the time of tap switching, and a part of the bubbles are introduced into the filter device through the oil suction pipe when the insulating oil filter device is operated. Some of these bubbles flow out through the oil discharge pipe, but some are accumulated in the insulating oil filter device by the dense filter.

Therefore, as the number of tap change times increases, the amount of pollutants filtered by the filter device increases, so that the performance of the filter device decreases, and at the same time, the amount of bubbles accumulated therein also increases. In this case, since the pressure inside the filter device for circulation of the insulating oil increases, a bubble layer compressed at high pressure is formed inside the filter device.

At this time, when the oil discharge pipe is temporarily blocked during the operation of the filter device and a part of the filter which is blocked at the time of opening occurs, the compressed air is expanded while the pressure inside the oil filter drum drops. Due to such bubble expansion, excessive flow velocity occurs in the oil discharge pipe, causing the protection relay to malfunction.

In addition, even when the oil suction pipe is temporarily blocked by the foreign matter during the operation of the filter device, there is a problem that the insulating oil flowing into the oil discharge pipe flows toward the conservator and affects the flow rate change of the protective relay side.

Korea Utility Model Registration No. 20-403992, No. 20-410886

Accordingly, an object of the present invention is to solve the conventional problems as described above, to prevent the bubbles from being compressed inside the housing of the filter device to prevent the malfunction of the protective relay due to the compression and expansion of the bubbles.

Another object of the present invention is to install an oil pump inside the filter so that the insulating oil filtered through the foreign matter and bubbles pass through the oil pump.

Still another object of the present invention is to minimize the intake of foreign matter through the oil suction pipe into the housing of the filter device.

According to a feature of the present invention for achieving the above object, the present invention provides a housing having an inner space in which the insulating oil is filled and a filter for filtering foreign substances of the insulating oil is installed, and supplying the insulating oil to the interior of the housing An oil suction pipe, an oil discharge pipe for discharging the insulating oil from the housing, and the oil pump is installed in the inner space of the housing to press the insulating oil in the inner space directly to the oil discharge pipe.

The oil pump is installed inside the filter.

The inlet of the oil suction pipe is installed in the tab switching unit, and the inlet is provided with a plurality of suction holes, and a strainer is provided to surround the inlet of the suction hole.

The mesh of the strain net has a diameter smaller than the diameter of the inlet of the oil suction pipe.

The oil suction pipe is connected to the lower gravity direction of the housing, the oil discharge pipe is connected to the upper gravity direction of the housing.

The housing has a bubble confirmation window for confirming the bubbles of the inner space, the upper portion of the housing is provided with a bubble exhaust valve for discharging the bubbles of the inner space to the outside.

In the insulating oil filter device for tap switching parts according to the present invention, the following effects can be obtained.

First, in the present invention, since the oil pump installed inside the housing of the filter device is installed adjacent to the oil discharge pipe, the air bubbles inside the housing are not compressed by the pressure generated by the oil pump, and thus the pressure change of the air bubbles inside the housing is prevented. There is an effect that can prevent the malfunction of the protective relay by the.

In the present invention, since the filter is provided so as to surround the oil pump installed adjacent to the oil discharge pipe in the filter device, the air bubbles and foreign matters are blocked by the filter and the air bubbles are positioned around the filter, so that the outside There is also an effect that makes it easier to check the amount of bubbles in the discharge.

In addition, in the present invention, a plurality of holes are formed in the inlet of the oil supply pipe for transferring the insulating oil to the housing of the filter device, and the foreign matter generated in the tap-changing part is enclosed by the filter net through the oil supply pipe. There is also an effect to prevent the malfunction of the protective relay by reducing the problem that the inlet is blocked at once by the coarse foreign matter that can block the pipe at a time to reduce the transmission to the inside.

1 is a schematic cross-sectional view showing the configuration of an insulating oil filter device for a tap-changing part according to the present invention.
Figure 2 is a block diagram showing the configuration of a tap-change system is used filter device according to the present invention.
Figure 3 is a schematic cross-sectional view showing the configuration of the inlet portion of the oil suction pipe employed in the filter device according to the present invention.
4 is an explanatory view showing that the tap-changer system employing the filter device according to the present invention is operated.

Hereinafter, a preferred embodiment of the insulating oil filter device for a tap-changing part according to the present invention will be described in detail with reference to the accompanying drawings.

As shown in Figure 1, the filter device of the present invention is provided with a housing (10). An inner space 12 is formed inside the housing 10, and the insulating oil is filled therein, and the insulating oil is filtered while passing through the housing 10.

The oil suction pipe 14 and the oil discharge pipe 16 are connected to the housing 10, respectively, to supply the insulating oil to the inner space 12 of the housing 10, and to filter the filtered insulating oil to the outside of the housing 10. Will be discharged. The oil suction pipe 14 is connected to the lower portion of the gravity direction in the housing 10, and the oil discharge pipe 16 is preferably connected to the upper portion of the gravity direction. But that doesn't have to be the case.

An oil pump 18 is installed inside the housing 10 adjacent to the oil discharge pipe 16. The oil pump 18 sucks and pressurizes the insulating oil in the internal space 12 of the housing 10 and delivers the oil to the oil discharge pipe 16.

The oil pump 18 is installed inside the filter 20. The filter 20 filters out foreign substances mixed with insulating oil. The filter 20 may be any type as long as it can filter foreign matter in the insulating oil. Since the filter 20 is configured to surround the oil pump 18, foreign substances and bubbles are not transferred to the oil pump 18. In particular, the filter 20 serves to prevent the bubble and the oil pump 18 from contacting each other. The filter 20 surrounds the oil pump 18 while distinguishing an area adjacent to the oil discharge pipe 16 from another area of the housing 10.

On the other hand, the oil discharge pipe 16 is provided with a flow meter 22 to provide a flow rate flowing through the oil discharge pipe 16. A bubble exhaust valve 24 is installed at an upper portion of the housing 10 to discharge bubbles filled in the inner space 12 of the housing 10 to the outside.

The upper part of the housing 10 is also provided with a bubble observation window (26). The bubble observation window 26 is to confirm the bubbles in the housing (10). Reference numeral 27 is an oil level gauge.

On the other hand, the structure of the tap-changer part system which the filter apparatus of this invention is used is demonstrated. The oil discharge pipe 16 is connected to the tap switching unit 28 to supply insulating oil into the tap switching unit 28. A protective relay 30 is connected to the tap changer 28, and a conservator 32 is also connected to the protective relay 30.

The inlet portion 34 of the oil suction pipe 14 of the filter device is located inside the tap changer 28. The oil suction pipe 14 serves to deliver the insulating oil having an insulation function in the tap switching unit 28 to the filter device. The oil suction pipe 14 is inserted downward from the top of the gravity direction of the tab switching unit 28. Thus, the inlet 34 of the oil suction pipe 14 is located inside the tap changer 28.

A plurality of suction holes 36 are formed in the inlet 34. A plurality of suction holes 36 are formed to open to the outer surface of the inlet portion 34 of the oil suction pipe 14 so as to communicate the inside and outside of the oil suction pipe 14. The suction hole 36 allows the insulating oil to be sucked into the oil suction pipe 14 even if the inlet of the oil suction pipe 14 is blocked.

The inlet 34 of the oil suction pipe 14 is surrounded by a strainer 38. The mesh 38 is preferably smaller than the inner diameter of the inlet 34 of the oil suction pipe 14. By placing the strainer 38 in this manner, foreign matters having a size that can block the oil suction pipe 14 at once can be prevented from being sucked into the oil suction pipe 14.

It will be described below that the insulating oil filter device of the tap-changing part according to the present invention having the configuration as described above is used.

When the switching action occurs in the tap switching unit 28, sparks, etc. are generated. In this process, foreign matter or bubbles are generated in the insulating oil inside the tap switching unit 28. In order to remove such foreign matter or bubbles to maintain the characteristics of the insulating oil, the insulating oil inside the tap switching unit 28 is periodically inside the housing 10 through the oil suction pipe 14 as shown in FIG. 4. To pass.

This may use a suction force of the oil pump 18 installed inside the housing 10 or may use a pressure pump (not shown) installed in the oil suction pipe 14 separately. In the process of sucking the insulating oil in the tap switching unit 28 into the oil suction pipe 14, the strainer 38 prevents foreign substances larger than its diameter from being transferred to the oil suction pipe 14.

In other words, the large amount of foreign matter that can be blocked at once the oil suction pipe 14 enters through the inlet 34 of the oil suction pipe 14 to prevent the oil suction pipe 14 is blocked, so that the oil As the suction pipe 14 is blocked and opened again, a change in the flow rate occurs, thereby preventing the protection relay 30 from malfunctioning.

In addition, forming the suction hole 36 around the outer surface of the inlet part 34 may cause the inlet of the oil suction pipe 14 to be blocked by foreign matter due to a problem such as tearing of the strainer 38. Even so, the insulating oil is sucked into the oil suction pipe 14 through the suction hole 36.

Insulating oil is supplied to the inner space 12 of the housing 10 through the oil suction pipe 14. The insulating oil filled in the internal space 12 passes through the filter 20 with suction force by the operation of the oil pump 18. In this process, bubbles and foreign substances are filtered out, and the bubbles are positioned between the filter 20, which is an upper portion of the inner space 12 of the housing 10, and the inner surface of the housing 10.

In this way, the insulating oil pressurized by the oil pump 18 is not discharged into the inner space 12 of the housing 10, but is directly transferred to the oil discharge pipe 16, thereby operating by the oil pump 18. Pressurized insulating oil does not affect the pressure of the insulating oil in the housing 10 so that the pressure of the internal space 12 of the housing 10 does not increase.

In addition, the oil pump 18 of the present invention does not increase the pressure in the inner space 12 of the housing 10, as described above, so as not to compress the bubbles, the flow rate changes due to the compression and expansion of the bubbles It does not cause malfunction of the protection relay.

The insulating oil sucked by the oil pump 18 is delivered to the oil discharge pipe 16, and is transferred back to the inside of the tap changer 28 through the oil discharge pipe 16 to perform a function as insulating oil. do.

On the other hand, when there is a large amount of bubbles in the inner space 12 of the housing 10, the operator checks through the bubble observation window 26 and also check the oil level through the oil gauge 27 or less determined value When the air is discharged to the outside of the housing 10 by using the bubble exhaust valve (24).

Then, the amount of the insulating oil flowing through the oil discharge pipe 16 is checked through the flow meter 22, and when the flow rate measured by the flow meter 22 falls below a predetermined value, the filter 20 may be replaced. .

The scope of the present invention is not limited to the embodiments described above, but may be defined by the scope of the claims, and those skilled in the art may make various modifications and alterations within the scope of the claims It is self-evident.

10: housing 12: inner space
14: oil suction piping 16: oil discharge piping
18: oil pump 20: filter
22: flow meter 24: bubble exhaust valve
26: bubble observation window 27: oil gauge
28: tap-changing part 30: protective relay
32: conservator 34: entrance
36: suction hole 38: strainer

Claims (6)

A housing having an inner space in which insulating oil is filled and a filter for filtering foreign substances of the insulating oil is installed;
An oil suction pipe for supplying insulating oil to the inside of the housing;
An oil discharge pipe discharging the insulating oil from the housing;
Insulating oil filter device of the tap-changing unit is installed in the inner space of the housing including an oil pump for pressurizing the insulating oil in the inner space to discharge directly to the oil discharge pipe.
The insulating oil filter device of claim 1, wherein the oil pump is installed inside the filter.
According to claim 1, wherein the inlet portion of the oil suction pipe is installed in the tap switching unit, the inlet portion is formed with a plurality of suction holes, the tap switching unit insulating oil filter device provided with a strainer to surround the inlet portion formed with the suction hole .
The insulating oil filter device of claim 3, wherein the mesh of the strainer has a diameter smaller than a diameter of an inlet of the oil suction pipe.
The insulating oil filter device according to any one of claims 1 to 4, wherein the oil suction pipe is connected to the lower portion of the housing in the gravity direction, and the oil discharge pipe is connected to the gravity direction upper portion of the housing.
The insulating oil filter device of claim 5, wherein the housing includes a bubble confirmation window for checking bubbles in the inner space, and a bubble exhaust valve for discharging bubbles in the inner space to the outside of the housing.
KR1020110138929A 2011-12-21 2011-12-21 Insulating oil filtering apparatus for on load tap changer KR20130071622A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020110138929A KR20130071622A (en) 2011-12-21 2011-12-21 Insulating oil filtering apparatus for on load tap changer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020110138929A KR20130071622A (en) 2011-12-21 2011-12-21 Insulating oil filtering apparatus for on load tap changer

Publications (1)

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KR20130071622A true KR20130071622A (en) 2013-07-01

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108172371A (en) * 2018-02-13 2018-06-15 沈阳新工变压器附件厂 Oil gas shunting gas operated device
KR101940999B1 (en) * 2018-12-19 2019-01-22 한국메가와트 주식회사 Insulation oil filtering apparatus of power transformer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108172371A (en) * 2018-02-13 2018-06-15 沈阳新工变压器附件厂 Oil gas shunting gas operated device
KR101940999B1 (en) * 2018-12-19 2019-01-22 한국메가와트 주식회사 Insulation oil filtering apparatus of power transformer

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