JPH0642437B2 - Transformer - Google Patents
TransformerInfo
- Publication number
- JPH0642437B2 JPH0642437B2 JP59190854A JP19085484A JPH0642437B2 JP H0642437 B2 JPH0642437 B2 JP H0642437B2 JP 59190854 A JP59190854 A JP 59190854A JP 19085484 A JP19085484 A JP 19085484A JP H0642437 B2 JPH0642437 B2 JP H0642437B2
- Authority
- JP
- Japan
- Prior art keywords
- fixing plate
- potential fixing
- voltage coil
- ground electrode
- iron core
- 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 - Lifetime
Links
Classifications
-
- 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
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/343—Preventing or reducing surge voltages; oscillations
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Insulating Of Coils (AREA)
- Regulation Of General Use Transformers (AREA)
Description
【発明の詳細な説明】 本発明は試験用変圧器等のように小電流高電圧の変圧器
において、負荷側の閃絡等により生じた高周波サージ電
圧からの高圧コイル保護手段に関する。The present invention relates to a high voltage coil protection means from a high frequency surge voltage generated by a flashover or the like on a load side in a transformer having a small current and a high voltage such as a test transformer.
第１図は従来のこの種変圧器の構造を示す断面図で、鉄
心１に巻形２を設けて低圧コイル３を巻回し、巻始めお
よび巻終りを低圧端子（図示せず）に接続する。次い
で、その上に巻形４および電位固定板５を同軸に設け、
巻始め端を電位固定板に接続して高圧コイル６を巻回
し、最外周に高圧シールド７および高圧端子８を設けて
高圧コイルの巻終り端を接続する。なお、電位固定板５
はリード線９を通じて接地側端子１０に接続する。FIG. 1 is a sectional view showing the structure of a conventional transformer of this type. A winding form 2 is provided on an iron core 1 to wind a low-voltage coil 3, and the winding start and winding end are connected to a low-voltage terminal (not shown). . Then, the winding form 4 and the potential fixing plate 5 are coaxially provided on it,
The high voltage coil 6 is wound by connecting the winding start end to the potential fixing plate, and the high voltage shield 7 and the high voltage terminal 8 are provided on the outermost periphery to connect the winding end end of the high voltage coil. The potential fixing plate 5
Is connected to the ground side terminal 10 through the lead wire 9.
第２図に、この場合の等価回路を示す。ここで、第１図
における電位固定板５に対する高圧コイル６の等価静電
容量をC1、電位固定板の低圧コイルおよび鉄心等に対す
る対地静電容量をC2とし、かつ電位固定板が接地され
ず、絶縁されている場合を考えると、高圧端子８とアー
ス間の電圧Ｅは上記静電容量をC1とC2により分圧され、
電位固定板とアース間の電圧Ｖは Ｖ＝C1／（C1＋C2）・Ｅ となる。FIG. 2 shows an equivalent circuit in this case. Here, the equivalent capacitance of the high voltage coil 6 to the potential fixing plate 5 in FIG. 1 is C 1 , the ground capacitance of the potential fixing plate to the low voltage coil and the iron core is C 2 , and the potential fixing plate is grounded. However, considering the case of being insulated, the voltage E between the high voltage terminal 8 and the ground is divided by the capacitances C 1 and C 2 ,
The voltage V between the fixed potential plate and the ground is V = C 1 / (C 1 + C 2 ) · E.
電位固定板５は、実際はリード線９により接地側端子１
０に接続され外部で接地されるため、通常の状態では接
地電位に保たれ、なんら電圧は生じない。しかしリード
線９はわずかながらインダクタンス１１を有する。よっ
て、リード線９に流れる接地電流が商用周波数の場合は
なんら問題はない。ところが、試験用変圧器等のように
負荷に高電圧を印加する場合、負荷側で絶縁破壊によ閃
絡が生じサージ電流が流れると、その周波数に対応して
リード線９のインピーダンスはインダクタンス１１によ
り極めて大となる。このため、電位固定板の電圧が上昇
し、絶縁が破壊され、高圧コイルが損傷するおそれがあ
る。The potential fixing plate 5 is actually connected to the ground side terminal 1 by the lead wire 9.
Since it is connected to 0 and grounded externally, it is kept at the ground potential in a normal state and no voltage is generated. However, the lead wire 9 has a slight inductance 11. Therefore, when the ground current flowing through the lead wire 9 has a commercial frequency, there is no problem. However, when a high voltage is applied to a load such as a test transformer, if a surge current flows due to a dielectric breakdown on the load side and a surge current flows, the impedance of the lead wire 9 corresponds to the inductance 11 Will be extremely large. Therefore, the voltage of the potential fixing plate rises, the insulation is broken, and the high voltage coil may be damaged.
本発明はこの欠点を解消するためになされたもので、電
位固定板と低圧コイルとの間に、電位固定板に対して大
きな静電容量を有する対地電極を設け、これを効果的に
アースすることにより、高周波サージ電圧が生じた場合
でも電位固定板に過大電圧が加わるおそれをなくしたも
ので、以下実施例について説明する。The present invention has been made to solve this drawback. A ground electrode having a large electrostatic capacity is provided between the potential fixing plate and the low voltage coil, and the ground electrode is effectively grounded. This eliminates the possibility that an excessive voltage is applied to the potential fixing plate even when a high frequency surge voltage is generated. An embodiment will be described below.
第３図において、低圧コイル３の外側に、絶縁リング２
１で両側を支持された絶縁筒２２を設け、これに銅，ア
ルミニゥム等の薄板を１ターンを形成することのないよ
うに巻きつけて対地電極２３とし、鉄心１に接続する。
なお、対地電極の配置としては上記実施例は一例を示し
たものであり、要は対地電極２３は電位固定板と低圧コ
イルとの間に設け、電位固定板に対し大きな静電容量を
有し、かつ十分な絶縁を備えたものであればよい。In FIG. 3, the insulating ring 2 is provided outside the low-voltage coil 3.
1. An insulating cylinder 22 whose both sides are supported by 1 is provided, and a thin plate made of copper, aluminum or the like is wound around the insulating cylinder 22 so as not to form one turn to form a ground electrode 23, which is connected to the iron core 1.
It should be noted that the arrangement of the ground electrode is an example of the above-described embodiment. In short, the ground electrode 23 is provided between the potential fixing plate and the low voltage coil, and has a large electrostatic capacitance with respect to the potential fixing plate. In addition, it is sufficient if it has sufficient insulation.
第４図はこの場合の等価回路を示し、電位固定板５はリ
ード線９により接地側端子１０を通じて接地されるほ
か、高周波的には、対地電極との間の静電容量C3を介し
て鉄心に接続される。すなわち、対地電極と鉄心との間
は極めて短く、かつ絶縁を要しないため、両者間の接地
手段２４として金属片等を用い、ほとんどインダクタン
スのないように接続することができる。FIG. 4 shows an equivalent circuit in this case, in which the potential fixing plate 5 is grounded by the lead wire 9 through the ground side terminal 10, and in terms of high frequency, through the electrostatic capacitance C 3 with the ground electrode. Connected to the iron core. That is, since the ground electrode and the iron core are extremely short and do not require insulation, it is possible to use a metal piece or the like as the grounding means 24 between them and to connect them with almost no inductance.
よって対地電極を電位固定板に接近して設け、あるいは
両者間の絶縁物として誘電係数の大きなものを用いる等
の手段により電位固定板５と対地電極２３間の静電容量
C3を大きくすることにより、高圧コイル６に高周波サー
ジ電圧が生じた場合でも、電位固定板５より静電容量C3
を通じて対地電極２３から鉄心１に接地電流が流れ、電
位固定板５を接地電位に保持することができる。ただ
し、接地側端子１０は高圧コイルの絶縁抵抗測定時等必
要に応じて接地が外される場合もあるため、対地電極２
３は電位固定板５に対し十分な絶縁を有することが必要
である。Therefore, the capacitance between the potential fixing plate 5 and the ground electrode 23 is provided by a means such as providing the ground electrode close to the potential fixing plate, or using an insulating material having a large dielectric coefficient between them.
By increasing C 3 , even if a high frequency surge voltage is generated in the high voltage coil 6, the electrostatic capacity C 3 is applied from the potential fixing plate 5.
Through this, a ground current flows from the ground electrode 23 to the iron core 1, and the potential fixing plate 5 can be held at the ground potential. However, the grounding side terminal 10 may be grounded as necessary when measuring the insulation resistance of the high-voltage coil.
3 must have sufficient insulation with respect to the potential fixing plate 5.
すなわち、この種変圧器の高圧コイル６は場合によって
はアースから切り離すことがあり、このため巻始め端を
直接には接地せず、リード線９により変圧器容器の外周
に設けた接地側端子１０に接続する。よって、リード線
９は十分に絶縁を施された、かなりの長さとなり、サー
ジ電圧の高周波成分に対してはそのインダクタンスを無
視することはできず、高圧コイル６の巻始め、すなわち
これに接続された電位固定板５の電圧を上昇させること
になる。That is, the high-voltage coil 6 of this type of transformer may be disconnected from the ground depending on the circumstances, so that the winding start end is not directly grounded but the ground side terminal 10 provided on the outer circumference of the transformer container by the lead wire 9. Connect to. Therefore, the lead wire 9 is sufficiently insulated and has a considerable length, and its inductance cannot be ignored with respect to the high-frequency component of the surge voltage. The voltage of the fixed potential fixing plate 5 thus increased.
この点、本発明においては電位固定板に対し大きな静電
容量を有する対地電極を設け、これを鉄心に接地するこ
とにより、電位固定板自体が大きな静電容量で接地され
た状態にしたもので、上述したように対地電極は鉄心と
の距離が極めて短かく、かつその間は絶縁する必要がな
いため、金属片により高周波的にも極めて効果的に接続
し、同電位に保つことができる。なお対地電極の鉄心へ
の接続手段としては、予め対地電極に接続用の金属片を
付加したものを制作し、その金属片を鉄心に接続するよ
うに構成することもできる。In this respect, according to the present invention, a ground electrode having a large electrostatic capacity is provided to the potential fixing plate, and the potential fixing plate itself is grounded with a large electrostatic capacity by grounding this to the iron core. As described above, since the ground electrode has a very short distance from the iron core and there is no need to insulate between the iron core and the ground electrode, the metal piece can be extremely effectively connected even at high frequencies and can be kept at the same potential. As a means for connecting the ground electrode to the iron core, it is also possible to manufacture one in which a metal piece for connection is added to the ground electrode in advance and connect the metal piece to the iron core.
以上説明したように本発明によるときは、高周波サージ
電圧に対して電位固定板の電位上昇のおそれをなくすこ
とができ、試験用変圧器のほか、小容量高電圧の変圧器
に適用して大きな効果を有するものである。As described above, according to the present invention, it is possible to eliminate the risk of the potential of the potential fixing plate rising with respect to the high frequency surge voltage, and it is possible to apply it to a small capacity high voltage transformer as well as a test transformer. It has an effect.
第１図は従来のこの種変圧器の構造を示す断面図、第２
図はその等価回路図、第３図は本発明の実施例を示す断
面図、第４図はその等価回路図である。 １…鉄心、３…低圧コイル、５…電位固定板、６…高圧
コイル、２３…対地電極、２４…接続手段。FIG. 1 is a sectional view showing the structure of a conventional transformer of this type, and FIG.
FIG. 4 is an equivalent circuit diagram thereof, FIG. 3 is a sectional view showing an embodiment of the present invention, and FIG. 4 is an equivalent circuit diagram thereof. DESCRIPTION OF SYMBOLS 1 ... Iron core, 3 ... Low voltage coil, 5 ... Potential fixing plate, 6 ... High voltage coil, 23 ... Ground electrode, 24 ... Connection means.
Claims (1)
コイル上に同軸に巻回された高圧コイル、および上記低
圧コイルと高圧コイルとの間に設けられ上記高圧コイル
の巻始めに接続されリード線を介して接地側端子に接続
された電位固定板とを具備する変圧器において、上記電
位固定板と低圧コイルとの間に、上記電位固定板に対し
絶縁された対地電極を設けて上記鉄心に接続し、上記電
位固定板は上記対地電極との間の静電容量を介して接地
されることを特徴とする変圧器。1. A low-voltage coil wound on an iron core, a high-voltage coil coaxially wound on the low-voltage coil, and provided between the low-voltage coil and the high-voltage coil and connected to the beginning of winding of the high-voltage coil. And a potential fixing plate connected to the ground side terminal via a lead wire, wherein a ground electrode insulated from the potential fixing plate is provided between the potential fixing plate and the low voltage coil. A transformer characterized in that it is connected to the iron core, and the potential fixing plate is grounded via a capacitance between the potential fixing plate and the ground electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59190854A JPH0642437B2 (en) | 1984-09-12 | 1984-09-12 | Transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59190854A JPH0642437B2 (en) | 1984-09-12 | 1984-09-12 | Transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6169107A JPS6169107A (en) | 1986-04-09 |
| JPH0642437B2 true JPH0642437B2 (en) | 1994-06-01 |
Family
ID=16264877
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59190854A Expired - Lifetime JPH0642437B2 (en) | 1984-09-12 | 1984-09-12 | Transformer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0642437B2 (en) |
-
1984
- 1984-09-12 JP JP59190854A patent/JPH0642437B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6169107A (en) | 1986-04-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |