JPH0142332Y2 - - Google Patents
Info
- Publication number
- JPH0142332Y2 JPH0142332Y2 JP1983064170U JP6417083U JPH0142332Y2 JP H0142332 Y2 JPH0142332 Y2 JP H0142332Y2 JP 1983064170 U JP1983064170 U JP 1983064170U JP 6417083 U JP6417083 U JP 6417083U JP H0142332 Y2 JPH0142332 Y2 JP H0142332Y2
- Authority
- JP
- Japan
- Prior art keywords
- container
- air
- core coil
- wall
- neutral point
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired
Links
Landscapes
- Housings And Mounting Of Transformers (AREA)
Description
【考案の詳細な説明】
この考案は、空心式中性点リアクトルに関する
ものである。[Detailed description of the invention] This invention relates to an air-core neutral point reactor.
第１図はこの種のリアクトルの従来例であり、
鉄製容器１内に空心コイル２を収容し、空心コイ
ル２の一端を変圧器の中性点Ｎに接続し、空心コ
イル２の他端を接地線Ｅを接続するものである。
この空心式中性点リアクトルによれば、３相線路
に１線地絡事故が起きて空心コイル２に電流が流
れた際、空心コイル２の漏れ磁束により容器壁内
のうず電流損を発生させ、これにより空心式中性
点リアクトルの直列抵抗の容量の低減ないし省略
を図ることができるものである。 Figure 1 shows a conventional example of this type of reactor.
An air-core coil 2 is housed in an iron container 1, one end of the air-core coil 2 is connected to a neutral point N of a transformer, and the other end of the air-core coil 2 is connected to a grounding wire E.
According to this air-core neutral point reactor, when a one-line ground fault occurs in a three-phase line and current flows through the air-core coil 2, leakage magnetic flux from the air-core coil 2 causes eddy current loss in the container wall. This makes it possible to reduce or eliminate the capacitance of the series resistor of the air-core neutral point reactor.
ところが、この空心式中性点リアクトルは、第
５図ａに示した温度分布曲線Q1から明らかなよ
うに、第４図の空心コイル２の軸方向の中央部
（ｈ＝０）に相当する壁部分１ａが最も磁束が集
中するため損失が大きくなつて温度が異常に上昇
し、このため容器１の塗料や容器１内の絶縁油の
変質劣化が生じ、また人が容器に触れたとき火傷
のおそれがあるといつた問題があつた。 However, as is clear from the temperature distribution curve Q1 shown in Figure 5a, this air-core neutral point reactor corresponds to the axial center (h = 0) of the air-core coil 2 in Figure 4. Since the magnetic flux is most concentrated in the wall portion 1a, the loss increases and the temperature rises abnormally, which causes deterioration of the paint on the container 1 and the insulating oil inside the container 1, and also causes burns when a person touches the container. There was a problem that was said to be at risk.
この問題を解決するものとして、第２図のよう
に容器１の内壁に電磁シールド（たとえば実公昭
53−42757号）３を設けて容器壁に入る磁界を弱
めるものが考えられた。しかし、このものは温度
上昇は低下できるが、逆に抵抗容量を節約するに
十分な損失量が得にくく、また構造が複雑になる
という欠点があつた。 To solve this problem, as shown in Fig. 2, an electromagnetic shield (for example, a
53-42757) 3 to weaken the magnetic field entering the container wall. However, although this method can reduce the temperature rise, it has the disadvantage that it is difficult to obtain a sufficient amount of loss to save the resistance capacitance, and the structure is complicated.
したがつて、この考案の目的は、構造が簡単で
異常温度上昇を低減でき、しかも抵抗容量の節減
を十分に図ることができる空心式中性点リアクト
ルを提供することである。 Therefore, an object of this invention is to provide an air-core type neutral point reactor that has a simple structure, can reduce abnormal temperature rise, and can sufficiently reduce resistance and capacitance.
この考案の第１の実施例を第３図に示す。すな
わち、この空心式中性点リアクトルは、鉄製容器
４内に空心コイル５を絶縁間隔をおいて収容し、
空間内に絶縁油６を充満させるとともに、容器４
の天部に高圧側プツシング７および低圧側プツシ
ング８を設けて、コイル端のリード線９，１０を
これらに通し、高圧側リード線９を変圧器の中性
点Ｎに接続し、低圧側リード線１０を接地線Ｅに
接続している。 A first embodiment of this invention is shown in FIG. That is, this air-core type neutral point reactor houses an air-core coil 5 in an iron container 4 with an insulating interval,
While filling the space with insulating oil 6, the container 4
A high voltage side pushing 7 and a low voltage side pushing 8 are provided on the top of the transformer, the lead wires 9 and 10 at the end of the coil are passed through these, the high voltage side lead wire 9 is connected to the neutral point N of the transformer, and the low voltage side lead is connected to the neutral point N of the transformer. Line 10 is connected to ground wire E.
このような構成において、とくに容器４の周壁
で空心コイルの軸方向の中央部に対応する部分４
ａの壁厚を、その他の壁厚ｔの４倍すなわち、4t
としている。 In such a configuration, in particular, the portion 4 of the peripheral wall of the container 4 corresponding to the central portion of the air-core coil in the axial direction
Let the wall thickness of a be 4 times the other wall thickness t, that is, 4t
It is said that
一般にこの種の中性点リアクトルは15秒程度の
短時間定格であるため、通電時間内に容器壁に発
生する熱量はほとんどすべての容器壁中に蓄えら
れる。すなわち、この時間内で容器壁の厚み方向
への熱伝達はその厚さが数ミリ程度のため十分に
行われるが、長手方向は数百ミリ程度になるため
熱の移動がほとんどない。さらに商用周波域では
壁に対する磁界の浸透深さは通常用いられる数ミ
リの厚さ以下であり、損失はほとんどこの厚さの
範囲内で発生するので、壁厚を増すことによる損
失の増加は極くわずかである。このため容器壁の
温度上昇はその部分の容器の壁厚すなわち熱容量
に反比例すると考えることができる。 Generally, this type of neutral point reactor has a short-time rating of about 15 seconds, so the amount of heat generated in the container wall during the energization time is stored in almost all of the container wall. That is, within this time, heat transfer in the thickness direction of the container wall is sufficient because the thickness is about several millimeters, but since the thickness is about several hundred millimeters in the longitudinal direction, there is almost no heat transfer. Furthermore, in the commercial frequency range, the penetration depth of the magnetic field into the wall is less than the commonly used thickness of several millimeters, and most losses occur within this thickness range, so increasing the wall thickness will only increase the loss. Very few. Therefore, the temperature rise of the container wall can be considered to be inversely proportional to the wall thickness of the container at that portion, that is, the heat capacity.
実験によれば、抵抗容量を省略できる程度の損
失を通常の６mm程度の壁厚の容器で発生させよう
とした場合、容器壁の最高の温度上昇は300℃以
上になることがあるが、この部分の壁厚をたとえ
ば実施例のように４倍にすると、温度上昇は90℃
以下となる。この結果、容器の塗料や絶縁油の変
質劣化や火傷等の危険性も減少させることができ
る。第５図ａの曲線Q2は同図ｂ（第３図に相当）
の容器の壁に基づく温度分布の計算結果である。 According to experiments, when trying to generate a loss that can eliminate the resistance capacitance in a container with a normal wall thickness of about 6 mm, the maximum temperature rise of the container wall can exceed 300°C. For example, if the wall thickness of the part is quadrupled as in the example, the temperature rise will be 90℃.
The following is true. As a result, it is possible to reduce the risk of deterioration of the paint and insulating oil of the container, as well as the risk of burns. Curve Q 2 in Figure 5 a is the same figure b (corresponding to Figure 3)
This is the calculation result of the temperature distribution based on the wall of the container.
また、容器壁を厚くする部分は一部分のみでよ
いので、容器のコスト高、重量増加も左程でなく
構造が簡単である。 Further, since the container wall only needs to be thickened in one part, the cost and weight of the container do not increase as much, and the structure is simple.
この考案の第２の実施例を第６図に示す。すな
わち、これは容器４′の空心コイル５の中央部に
相当する壁部分４′ａの壁厚を中央が最大となる
ように複数段の階段状に形成したものである。こ
の温度分布を第５図ｃに対応させて曲線Q3で示
す。 A second embodiment of this invention is shown in FIG. In other words, the wall portion 4'a of the container 4' corresponding to the center of the air-core coil 5 is formed into a plurality of steps so that the wall thickness is maximum at the center. This temperature distribution is shown by curve Q 3 corresponding to FIG. 5c.
さらに厚みの段数を増加すると温度分布の同一
化が図れる。 Furthermore, by increasing the number of thickness steps, the temperature distribution can be made uniform.
以上のように、この考案の空心式中性点リアク
トルは、空心コイルと、この空心コイルを収容す
るとともに空心コイルの軸方向の中心部に対応す
る壁部分の壁厚を他の部分の壁厚より増大したう
ず電流損発生用の鉄製容器とを備えたため、抵抗
容量を低減ないし省略でき、異常温度上昇を抑制
でき、しかも構造が簡単になるという効果があ
る。 As described above, the air-core neutral point reactor of this invention has an air-core coil, a wall thickness of the wall portion that accommodates the air-core coil, and corresponds to the axial center of the air-core coil, and a wall thickness of other portions. Since an iron container for generating increased eddy current loss is provided, the resistance capacity can be reduced or omitted, abnormal temperature rise can be suppressed, and the structure can be simplified.
第１図は従来例の断面図、第２図は他の従来例
の断面図、第３図はこの考案の第１の実施例の断
面図、第４図は中性点リアクトルの位置座標を示
す説明図、第５図は容器壁の温度分布図、第６図
は第２の実施例の断面図である。
４，４′……容器、４ａ，４′ａ……壁部分、５
……空心コイル。
Fig. 1 is a sectional view of a conventional example, Fig. 2 is a sectional view of another conventional example, Fig. 3 is a sectional view of the first embodiment of this invention, and Fig. 4 shows the position coordinates of the neutral point reactor. FIG. 5 is a temperature distribution diagram of the container wall, and FIG. 6 is a sectional view of the second embodiment. 4, 4'... Container, 4a, 4'a... Wall portion, 5
...Air core coil.
Claims (1)
もに空心コイルの軸方向の中心部に対応する壁部
分の壁厚を他の部分の壁厚より増大したうず電流
損発生用の鉄製容器とを備えた空心式中性点リア
クトル。 An air core equipped with an air core coil and an iron container for eddy current loss generation that accommodates the air core coil and has a wall thickness greater in a wall portion corresponding to the axial center of the air core coil than in other portions. formula neutral point reactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6417083U JPS59169024U (en) | 1983-04-27 | 1983-04-27 | Air-core neutral point reactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6417083U JPS59169024U (en) | 1983-04-27 | 1983-04-27 | Air-core neutral point reactor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59169024U JPS59169024U (en) | 1984-11-12 |
| JPH0142332Y2 true JPH0142332Y2 (en) | 1989-12-12 |
Family
ID=30194354
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6417083U Granted JPS59169024U (en) | 1983-04-27 | 1983-04-27 | Air-core neutral point reactor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59169024U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0526726Y2 (en) * | 1985-10-01 | 1993-07-07 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5342757U (en) * | 1976-09-16 | 1978-04-12 |
-
1983
- 1983-04-27 JP JP6417083U patent/JPS59169024U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59169024U (en) | 1984-11-12 |
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