JP5269716B2 - Oil-filled transformer - Google Patents

Oil-filled transformer Download PDF

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JP5269716B2
JP5269716B2 JP2009187016A JP2009187016A JP5269716B2 JP 5269716 B2 JP5269716 B2 JP 5269716B2 JP 2009187016 A JP2009187016 A JP 2009187016A JP 2009187016 A JP2009187016 A JP 2009187016A JP 5269716 B2 JP5269716 B2 JP 5269716B2
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oil
radiator
valve
passage
transformer
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JP2011040588A (en
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圭亮 久保田
洋悦 中島
年樹 白畑
淳治 小野
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Hitachi Industrial Equipment Systems Co Ltd
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Hitachi Industrial Equipment Systems Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil-immersed transformer configured so that oil draining can be performed, in replacement of a radiator, in a radiator valve for interrupting insulating oil between a transformer tank and the radiator. <P>SOLUTION: In replacement of the radiator, a radiator valve 1 is closed by operating an operation shaft 11 of a butterfly valve to rotate and seat a valve element 12 on a valve seat 14. The radiator valve 1 includes an oil discharge mechanism 7 on the radiator side. The oil discharge mechanism 7 includes an oil-drain groove 8 formed at the bottom position of a valve passage 13, an oil-drain passage 9 formed to be opened to a groove bottom 8a of the oil discharge groove 8 and connected to the outside of the radiator valve 1; and a plug 10 removably provided in the oil discharge passage 9. The plug 10 is removed, whereby insulating oil 6 in the radiator 5 to be replaced is drained through the oil discharge mechanism 7. Thus, since an oil-drain valve for each radiator is eliminated, the number of radiator attachment components can be reduced to reduce the manufacturing cost of the oil-immersed transformer. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

本発明は、ラジエターを備えた油入変圧器に関する。   The present invention relates to an oil-filled transformer provided with a radiator.

従来、変圧器においては鉄心やコイルは発熱体となるので、これを冷却するため、発生した熱を絶縁性の油やガスなどの冷却媒体で受熱し、当該冷却媒体をラジエターを通る経路で循環させ、ラジエターにて大気中へ放熱することが行われている。   Conventionally, transformers have iron cores and coils as heating elements, and in order to cool them, the generated heat is received by a cooling medium such as insulating oil or gas, and the cooling medium is circulated through a path through the radiator. And heat is released to the atmosphere with a radiator.

従来の変圧器の概略が図４に示されている。図４（ａ）は平面図、同（ｂ）は（ａ）のＡ−Ａ矢視図である。図４に示すように、油入変圧器２０は、鉄心やコイルを収容している変圧器容器２１を備えるとともに、変圧器容器２１に対して対称に接続される態様で複数個のラジエター２２が付設されている。変圧器容器２１内で鉄心やコイルから受熱した絶縁油のような冷却媒体は、変圧器容器２１に形成された流出口に接続される絶縁油流入用の接続パイプ２３ａを通じて各ラジエター２２内に流入し、ラジエター２２で放熱して冷却された後、ラジエター２２から絶縁油流出用の接続パイプ２３ｂを通じて流出して流入口から変圧器容器２１内へと循環するようになっている（特許文献１参照）。   A schematic of a conventional transformer is shown in FIG. 4A is a plan view, and FIG. 4B is a view taken along the line AA in FIG. As shown in FIG. 4, the oil-filled transformer 20 includes a transformer container 21 containing an iron core and a coil, and a plurality of radiators 22 are connected in a symmetrical manner with respect to the transformer container 21. It is attached. A cooling medium such as insulating oil received from the iron core or coil in the transformer container 21 flows into each radiator 22 through an insulating oil inflow connection pipe 23 a connected to an outlet formed in the transformer container 21. Then, after being radiated and cooled by the radiator 22, it flows out from the radiator 22 through the connection pipe 23 b for flowing out the insulating oil and circulates from the inlet to the transformer container 21 (see Patent Document 1). ).

各ラジエター２２は、上記の上部接続パイプ２３ａ及び下部接続パイプ２３ｂと、上部及び下部の接続パイプ２３に接続された左右一対の波形フィン２４，２４（一部のみ符号を付す）とを備えている。各波形フィン２４は、断面が波形になった鋼板製の放熱板として構成形されており、波形フィン２４の上下の端面が溶接されており、その内部は接続パイプ２３ａ，２３ｂと接続されて絶縁油が流入・流出可能な中空部とされている。   Each radiator 22 includes the above-described upper connection pipe 23a and lower connection pipe 23b, and a pair of left and right corrugated fins 24 and 24 (partially given reference numerals) connected to the upper and lower connection pipes 23. . Each corrugated fin 24 is configured and formed as a heat sink made of a steel plate having a corrugated cross section, and the upper and lower end surfaces of the corrugated fin 24 are welded, and the inside thereof is connected to the connection pipes 23a and 23b for insulation. It is a hollow part where oil can flow in and out.

各ラジエター２２において、ラジエター２２内に充満している絶縁油は、下部の接続パイプ２３ｂから流入口を経て変圧器容器２１内に流入し、熱源であるコイル、鉄心等により温められ、それによって変圧器１０を冷却する。温められた絶縁油は膨張し比重が小さくなり、流出口から上部の接続パイプ２３ａを経てラジエター２２内に流入する。ラジエター２２内では、波形フィン２４の各中空部に流入した絶縁油は、外気で冷却され比重が大きくなり下方に移動し、下部の接続パイプ２３ｂを通り流入口から再び変圧器容器２１に戻る。このように、冷却媒体としての絶縁油は、自然対流により油入変圧器１０とラジエター２２とを循環している。   In each radiator 22, the insulating oil filled in the radiator 22 flows into the transformer container 21 from the lower connection pipe 23 b through the inflow port, and is heated by a coil, an iron core, or the like as a heat source, and thereby transformed. Cool the vessel 10. The heated insulating oil expands and has a reduced specific gravity, and flows into the radiator 22 from the outlet through the upper connection pipe 23a. In the radiator 22, the insulating oil that has flowed into the hollow portions of the corrugated fins 24 is cooled by the outside air, increases in specific gravity, moves downward, passes through the lower connection pipe 23 b, and returns to the transformer container 21 from the inlet. Thus, the insulating oil as the cooling medium circulates between the oil-filled transformer 10 and the radiator 22 by natural convection.

ラジエター２２を備えた油入変圧器１０において、ラジエター２２の交換作業を行う場合、油入変圧器１０のラジエター２２〜変圧器容器２１（タンク）間にラジエターバルブを備えており、ラジエターバルブを閉じてラジエター２２と変圧器容器２１との間を遮断してから、ラジエター２２内の油だけをラジエター下部に設けた排油弁より排油している。変圧器容器２１内の油は、閉弁状態にあるラジエターバルブによって外部に漏れることがない。また、絶縁油の交換作業においては、排油弁から油入変圧器１０内の絶縁油を排油している。   When replacing the radiator 22 in the oil-filled transformer 10 provided with the radiator 22, a radiator valve is provided between the radiator 22 and the transformer container 21 (tank) of the oil-filled transformer 10, and the radiator valve is closed. After shutting off between the radiator 22 and the transformer container 21, only the oil in the radiator 22 is drained from an oil drain valve provided at the lower part of the radiator. The oil in the transformer container 21 does not leak to the outside by the radiator valve in the valve-closed state. In addition, in the replacement work of the insulating oil, the insulating oil in the oil-filled transformer 10 is drained from the oil drain valve.

特開平１１−３８２２号公報（段落００１４〜００１５、００２０；図３）JP 11-3822 (paragraphs 0014 to 0015, 0020; FIG. 3)

しかし、従来のラジエター構造では、交換するラジエター内の油だけを排油するためにはラジエターにラジエターバルブとは別に専用の排油弁をラジエターに設ける必要がある。ラジエター毎に排油弁を独立して設けることになるため、排油弁のための材料費・製造費を要し、ラジエター付きの油入変圧器の製造コストが上昇する一要因となっている。   However, in the conventional radiator structure, in order to drain only the oil in the radiator to be replaced, it is necessary to provide a dedicated drain valve on the radiator separately from the radiator valve. Since oil discharge valves are provided independently for each radiator, material costs and manufacturing costs for the oil discharge valves are required, which is one factor that increases the manufacturing cost of oil-filled transformers with radiators. .

そこで、ラジエター付きの油入変圧器における製造コストの上昇要因が、ラジエター毎にラジエターバルブ・排油弁を各々独立して設けることによる製造費・材料費の増大であることに着目して、ラジエターバルブから排油を行う点に解決すべき課題がある。
この発明の目的は、ラジエターバルブから排油を行うことで、ラジエター付きの油入変圧器における製造コストの上昇を抑えて、使い勝手の良い油入変圧器を提供することである。 Therefore, paying attention to the increase in manufacturing costs and material costs due to the independent provision of radiator valves and oil discharge valves for each radiator, the factor that increases the manufacturing cost of oil-filled transformers with radiators is There is a problem to be solved in that oil is discharged from the valve.
An object of the present invention is to provide an easy-to-use oil-filled transformer by suppressing oil from being discharged from a radiator valve, thereby suppressing an increase in manufacturing cost of the oil-filled transformer with a radiator.

上記課題を解決するため、この発明による油入変圧器は、コイル及び鉄心とともに前記コイル及び鉄心の冷却用としての冷却油が入れられた変圧器容器と、前記
変圧器容器との間で前記冷却油を冷却するラジエターと、前記変圧器容器と前記ラジエターとを通じて前記冷却油を循環させるため前記変圧器容器と前記ラジエ ターとを接続する接続パイプと、前記接続パイプに設けられて前記冷却油の通過を遮断するラジエターバルブとを備えており、前記ラジエターバルブに前記冷却油を排出する排油機構を設けており、更に前記排油機構は、前記ラジエターバルブの開閉される弁通路においてバルブ開閉位置よりも前記ラジエター側に設けられている。ラジエター接続側に排油溝を形成することで、前記ラジエターバルブが閉じられたときにラジエター側の絶縁油が排油溝を通じて排油され、更に、前記排油機構は、前記弁通路の最下位置に形成された排油溝と、当該排油溝に開口して繋がり前記ラジエターバルブの外部に通じるように形成された排油路と、当該排油路に取り外し可能に設けられているプラグとを備えている。排油溝をラジエターバルブの弁通路の最下位置に形成することで、排油時には、ラジエター側の絶縁油が残すことなく排油される。更に、前記ラジエターバルブをバタフライ弁として構成し、前記排油溝は前記バタフライ弁の弁座に設けられているストッパに沿って形成することができる。バタフライ弁の弁体はストッパを越えて排油溝側に動くことはないので、弁体と排油溝との干渉が生じることはない。
In order to solve the above-described problems, an oil-filled transformer according to the present invention includes a coil and an iron core together with a transformer container in which cooling oil for cooling the coil and the iron core is placed, and the cooling container. A radiator that cools the oil, a connection pipe that connects the transformer container and the radiator to circulate the cooling oil through the transformer container and the radiator, and a cooling pipe provided in the connection pipe. A radiator valve for blocking the passage, and is provided with an oil discharge mechanism for discharging the cooling oil to the radiator valve, and the oil discharge mechanism is arranged at a valve open / close position in a valve passage where the radiator valve is opened and closed. It is provided closer to the radiator side. By forming an oil draining groove on the radiator connecting side, when the radiator valve is closed, the insulating oil on the radiator side is drained through the oil draining groove, and the oil draining mechanism is disposed at the bottom of the valve passage. An oil drain groove formed at a position, an oil drain passage formed to open and connect to the oil drain groove and communicate with the outside of the radiator valve, and a plug detachably provided in the oil drain passage It has. By forming the oil drain groove at the lowest position of the valve passage of the radiator valve, the oil is drained without leaving the radiator-side insulating oil during oil drain. Further, the radiator valve may be configured as a butterfly valve, and the oil drain groove may be formed along a stopper provided in a valve seat of the butterfly valve. Since the valve body of the butterfly valve does not move to the oil drain groove side beyond the stopper, there is no interference between the valve body and the oil drain groove.

本発明による油入変圧器によれば、ラジエターバルブに排油弁の機能が集約されるので、ラジエター毎に独立した排油弁を設ける必要がなくなる。それにより、取付部品点数を削減し、ラジエターの取付部品を削減することができるため、ラジエターひいては油入変圧器の製造コストの低減を図ることができる。   According to the oil-filled transformer according to the present invention, since the functions of the oil discharge valve are integrated into the radiator valve, it is not necessary to provide an independent oil discharge valve for each radiator. Thereby, since the number of attachment parts can be reduced and the attachment parts of a radiator can be reduced, the manufacturing cost of a radiator and hence an oil-filled transformer can be reduced.

図１はラジエターを備えた本発明による油入変圧器の一実施例を示す正面図である。FIG. 1 is a front view showing an embodiment of an oil-filled transformer according to the present invention provided with a radiator. 図２は、図１に示す油入変圧器におけるラジエターバルブを一部を破断して示す構造図である。FIG. 2 is a structural diagram showing a part of the radiator valve in the oil-filled transformer shown in FIG. 図３は、図２に示すラジエターバルブの要部を示す斜視図である。FIG. 3 is a perspective view showing a main part of the radiator valve shown in FIG. 図４は、従来の変圧器の概略図である。FIG. 4 is a schematic diagram of a conventional transformer.

図１はラジエターバルブを設けた油入変圧器を示す。ラジエターバルブ１は、油入変圧器タンク２の下部に設けられた取付座４に取り付けて配置されている。ラジエター５は、下側ではラジエターバルブ１に対して、また上側では油入変圧器タンク２の上部の取付座３とに対して、それぞれ流入側（上部側）の接続パイプ１６ａと流出側（下部側）の接続パイプ１６ｂとを介して取付けられた状態で配置される。接続パイプ１６ｂは、絶縁油の循環を考慮してラジエター５の底部のレベルに接続されているので、ラジエター５内の絶縁油の排油に際いては、絶縁油はラジエター５内に残ることなく外部に排出可能となっている。   FIG. 1 shows an oil-filled transformer provided with a radiator valve. The radiator valve 1 is attached to a mounting seat 4 provided at the lower part of the oil-filled transformer tank 2 and arranged. The radiator 5 has a connection pipe 16a on the inflow side (upper side) and an outflow side (lower side) with respect to the radiator valve 1 on the lower side and the mounting seat 3 on the upper side of the oil-filled transformer tank 2 on the upper side. Side) connecting pipe 16b. Since the connection pipe 16b is connected to the bottom level of the radiator 5 in consideration of the circulation of the insulating oil, the insulating oil does not remain in the radiator 5 when draining the insulating oil in the radiator 5. It can be discharged to the outside.

ラジエター５及び油入変圧器タンク２内は、絶縁油６で満たされている。絶縁油６は、従来の油入変圧器の場合と同様にして、コイル及び鉄心が収容されている油入変圧器タンク２と、ラジエター５と、接続パイプ１６ａ，１６ｂとを通じて、コイル及び鉄心から熱を受けてラジエター５で放熱・冷却されることによって自然対流で循環する。   The radiator 5 and the oil-filled transformer tank 2 are filled with insulating oil 6. The insulating oil 6 is supplied from the coil and the iron core through the oil-filled transformer tank 2 in which the coil and the iron core are accommodated, the radiator 5, and the connection pipes 16a and 16b in the same manner as the conventional oil-filled transformer. It is circulated by natural convection by receiving heat and radiating and cooling with the radiator 5.

図２はラジエターバルブ１について、その一部を破断した詳細図である。ラジエターバルブ１は、内部の弁通路１３を直径方向に延びる操作軸１１の回りに回動して、弁通路１３を開閉する弁体１２を備えたバタフライ弁である。弁通路１３の内周には、弁体１２が当接して弁通路１３を遮断する弁座１４が備わっている。操作軸１１の外部に突出する軸端部１１ａはキャップ１５によって覆われており、誤操作等から保護している。   FIG. 2 is a detailed view of the radiator valve 1 with a part thereof broken. The radiator valve 1 is a butterfly valve including a valve body 12 that opens and closes the valve passage 13 by rotating the internal valve passage 13 around an operation shaft 11 extending in the diameter direction. A valve seat 14 that abuts the valve body 12 and blocks the valve passage 13 is provided on the inner periphery of the valve passage 13. A shaft end portion 11a protruding to the outside of the operation shaft 11 is covered with a cap 15 to protect it from an erroneous operation or the like.

ラジエターバルブ１のバルブ〜ラジエター５間には排油機構７が設けられている。図３には、ラジエターバルブ１の排油機構７に臨んで、拡大して示す斜視図である。即ち、排油機構７は、ラジエターバルブ１のラジエター５側の部位に削設された排油溝８と、排油溝８の溝底８ａに開口して繋がりラジエターバルブ１の外部に通じるように形成された排油路９と、排油路９に取り外し可能に設けられており、通常は栓として排油路９を閉じておくためのプラグ１０とを備えている。排油溝８は弁通路１３において、弁通路１３の長手方向の幅よりも周方向に長い弧状に形成するのが好ましい。   An oil drain mechanism 7 is provided between the valve of the radiator valve 1 and the radiator 5. FIG. 3 is an enlarged perspective view of the oil discharge mechanism 7 of the radiator valve 1. That is, the oil discharge mechanism 7 is connected to the oil discharge groove 8 cut in the radiator 5 side of the radiator valve 1 and the groove bottom 8a of the oil discharge groove 8 so as to communicate with the outside of the radiator valve 1. The formed oil drain passage 9 and a plug 10 that is detachably provided in the oil drain passage 9 and normally has a plug 10 for closing the oil drain passage 9 as a plug. The oil drain groove 8 is preferably formed in the valve passage 13 in an arc shape longer in the circumferential direction than the longitudinal width of the valve passage 13.

ラジエターバルブ１は、排油溝８が弁通路１３の最下位置となるように、その取付け状態を調節して取付座４に取り付けられる。こうした配置によって、排油溝８は、ラジエター５及び下部の接続パイプ１６ｂを含めて最も下位置を占めるので、ラジエター５及び接続パイプ１６ｂ内の絶縁油６は、ラジエター５及び接続パイプ１６ｂ内に残留することなく、全量が排油機構７を通じて排油される。排油溝８はバタフライ弁の弁座１４に設けられているストッパ１４ａに沿って形成されている。バタフライ弁の弁体１２はストッパ１４ａを越えて排油溝８側に移動することはないので、弁体１２と排油溝８との干渉は生じることがない。   The radiator valve 1 is attached to the attachment seat 4 by adjusting its attachment state so that the oil drain groove 8 is at the lowest position of the valve passage 13. With this arrangement, the oil drain groove 8 occupies the lowest position including the radiator 5 and the lower connection pipe 16b, so that the insulating oil 6 in the radiator 5 and the connection pipe 16b remains in the radiator 5 and the connection pipe 16b. The entire amount is drained through the oil drain mechanism 7 without doing so. The oil drain groove 8 is formed along a stopper 14a provided in the valve seat 14 of the butterfly valve. Since the valve body 12 of the butterfly valve does not move to the oil drain groove 8 side beyond the stopper 14a, interference between the valve body 12 and the oil drain groove 8 does not occur.

ラジエターバルブ１のこうした構造により、ラジエター５を交換する際には、まず、キャップ１５を取外してバタフライ弁の操作軸１１を操作し、弁体１２を回動して弁座１４に着座させることで、ラジエターバルブ１を閉じる。その後、排油機構７のプラグ１０を取外すことによって、交換するラジエター５内の絶縁油６だけを排油機構７から排油することができる。   With this structure of the radiator valve 1, when replacing the radiator 5, first, the cap 15 is removed, the operation shaft 11 of the butterfly valve is operated, the valve body 12 is rotated and seated on the valve seat 14. The radiator valve 1 is closed. Thereafter, by removing the plug 10 of the oil discharge mechanism 7, only the insulating oil 6 in the radiator 5 to be replaced can be discharged from the oil discharge mechanism 7.

その結果、ラジエター５毎に排油弁を設ける必要がなくなり、取付部品点数を削減するとともに、ラジエター５の取付部品についても削減することができるため、油入変圧器の製造コストの低減を図ることができる。なお、絶縁油のみの交換の場合も、ラジエターバルブ１を閉じることなく、排油機構７を操作することで、排油機構７を通じて排油することができる。   As a result, there is no need to provide an oil drain valve for each radiator 5, and the number of mounting parts can be reduced and the number of mounting parts for the radiator 5 can also be reduced, thereby reducing the manufacturing cost of the oil-filled transformer. Can do. Even when only the insulating oil is replaced, the oil can be drained through the oil drain mechanism 7 by operating the oil drain mechanism 7 without closing the radiator valve 1.

１ ラジエターバルブ ２ 油入変圧器タンク
３ 上部取付座 ４ 下部取付座
５ ラジエター ６ 絶縁油
７ 排油機構
８ 排油溝 ８ａ 溝底
９ 排油路 １０ プラグ
１１ 操作軸 １２ 弁体
１３ 弁通路
１４ 弁座 １４ａ ストッパ
１５ キャップ １６ａ，１６ｂ 接続パイプ DESCRIPTION OF SYMBOLS 1 Radiator valve 2 Oil-filled transformer tank 3 Upper mounting seat 4 Lower mounting seat 5 Radiator 6 Insulating oil 7 Oil draining mechanism 8 Oil draining groove 8a Groove bottom 9 Oil draining passage 10 Plug 11 Operation shaft 12 Valve body 13 Valve passage 14 Valve Seat 14a Stopper 15 Cap 16a, 16b Connection pipe

Claims (1)

コイル及び鉄心とともに前記コイル及び鉄心の冷却用としての冷却油が入れられた変圧器容器と、前記変圧器容器との間で前記冷却油を冷却するラジエターと、前記変圧器容器と前記ラジエターとを通じて前記冷却油を循環させるため前記変圧器容器と前記ラジエターとを接続する接続パイプと、前記接続パイプに設けられて前記冷却油の通過を遮断するラジエターバルブとを備え、
前記ラジエターバルブに前記冷却油を排出する排油機構を設けられており、
且つ、該排油機構は、前記ラジエターバルブの開閉される弁通路においてバルブ開閉位置よりも前記ラジエター側に設けられており、
更に、前記排油機構は、前記弁通路の最下位置に形成された排油溝と、当該排油溝に開口して繋がり前記ラジエターバルブの外部に通じるように形成された排油路と、当該排油路に取り外し可能に設けられているプラグとから構成されており、
更に、前記ラジエターバルブはバタフライ弁として構成されており、前記排油溝は前記バタフライ弁の弁座に設けられているストッパに沿って形成されていることを特徴とする油入変圧器。
A transformer container in which cooling oil for cooling the coil and the iron core is put together with the coil and the iron core, a radiator that cools the cooling oil between the transformer container, the transformer container, and the radiator A connection pipe that connects the transformer container and the radiator to circulate the cooling oil, and a radiator valve that is provided in the connection pipe and blocks passage of the cooling oil;
An oil discharge mechanism for discharging the cooling oil is provided in the radiator valve ,
In addition, the oil draining mechanism is provided on the radiator side with respect to the valve opening / closing position in the valve passage in which the radiator valve is opened and closed.
Furthermore, the oil drain mechanism includes an oil drain groove formed at a lowermost position of the valve passage, an oil drain passage formed to open to the oil drain groove and communicate with the outside of the radiator valve, It consists of a plug detachably provided in the oil drainage passage,
Furthermore, the radiator valve is configured as a butterfly valve, and the oil drain groove is formed along a stopper provided in a valve seat of the butterfly valve .
JP2009187016A 2009-08-12 2009-08-12 Oil-filled transformer Active JP5269716B2 (en)

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CN105805403A (en) * 2016-06-07 2016-07-27 李奇元 Oil drain valve for 10KV oil-immersed transformers
CN108565095A (en) * 2016-12-28 2018-09-21 于正富 A kind of application method of transformer
CN107221423B (en) * 2017-08-08 2018-11-09 宁波仁栋电气有限公司 A kind of loaded capacity-regulated transformer
CN112164569B (en) * 2020-09-27 2022-08-12 重庆望变电气（集团）股份有限公司 Oil tank pickling process for oil-immersed transformer
CN114267522B (en) * 2021-12-31 2022-09-13 江苏恒大变压器有限公司 Outdoor oil-immersed transformer convenient to installation protection machanism

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