JP3381645B2 - Transformer - Google Patents
TransformerInfo
- Publication number
- JP3381645B2 JP3381645B2 JP32917298A JP32917298A JP3381645B2 JP 3381645 B2 JP3381645 B2 JP 3381645B2 JP 32917298 A JP32917298 A JP 32917298A JP 32917298 A JP32917298 A JP 32917298A JP 3381645 B2 JP3381645 B2 JP 3381645B2
- Authority
- JP
- Japan
- Prior art keywords
- winding
- phase
- terminals
- phase load
- transformer
- 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 - Fee Related
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
- Ac-Ac Conversion (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、三相負荷より単相
負荷が大きい三相および単相負荷を供給する設備で、配
電盤は１回路以上の三相と３回路以上の単相三線回路を
有する受電または供給設備に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to equipment for supplying three-phase and single-phase loads in which the single-phase load is larger than the three-phase load. It relates to the power reception or supply equipment that it has.
【０００２】[0002]
【従来の技術】ビル、アパート、病院などの施設では、
動力用の三相電源と電灯用の単相電源の両方を必要とす
る。三相負荷と、三相負荷より大きい単相負荷を供給す
る場合、三相の電圧不平衡を防ぐため、単相負荷を各相
でバランスよく取る必要がある。そのため従来の受電ま
たは供給設備は、図４に示すように少なくとも三相負荷
のための三相変圧器Ａ１台と、単相負荷のための単相三
線変圧器Ｂ３台を使用していた。三相変圧器Ａは、一次
側がデルタ、二次側がスター結線の場合、一次巻線から
端子Ｕ，Ｖ，Ｗを引き出し、二次巻線から端子ｕ，ｖ，
ｗ，ｎ１を引き出し、端子ｎ１は中性点としている。単
相三線変圧器Ｂは、一次巻線から端子Ｘ１，Ｘ２を引き
出し、二次巻線から端子ｘ１，ｘ２，ｎ２を引き出し、
端子ｎ２は中性点とし、単相三線回路としている。[Prior Art] In facilities such as buildings, apartments and hospitals,
It requires both a three-phase power source for power and a single-phase power source for lights. When supplying a three-phase load and a single-phase load larger than the three-phase load, it is necessary to balance the single-phase load in each phase in order to prevent voltage imbalance of the three-phase. Therefore, the conventional power receiving or supplying equipment has used at least one three-phase transformer A for three-phase load and three single-phase three-wire transformer B for single-phase load as shown in FIG. In the three-phase transformer A, when the primary side is a delta connection and the secondary side is a star connection, the terminals U, V, W are drawn from the primary winding and the terminals u, v,
w and n1 are drawn out, and the terminal n1 is a neutral point. The single-phase three-wire transformer B draws terminals X1, X2 from the primary winding and draws terminals x1, x2, n2 from the secondary winding,
The terminal n2 is a neutral point and is a single-phase three-wire circuit.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら従来の受
電または供給設備では、最低でも変圧器が４台必要であ
り、受電または供給設備の設置スペースが広くなければ
ならず、例えばビルなどの電気室に収納できないことが
あった。本発明の目的は、上記した問題を解決し、受電
または供給設備の設置スペースを従来より遥かに少なく
でき、かつ三相の電圧が不平衡にならないよう、単相負
荷を各相でバランスよく取れる変圧器を提供することで
ある。However, in the conventional power receiving or supplying equipment, at least four transformers are required, and the installation space of the power receiving or supplying equipment must be wide. For example, in an electric room such as a building. Sometimes it couldn't be stored. The object of the present invention is to solve the above-mentioned problems, to make the installation space of power receiving or supplying equipment much smaller than before, and to take a well-balanced single-phase load in each phase so that three-phase voltages are not unbalanced. It is to provide a transformer.
【０００４】[0004]
【課題を解決するための手段】上記した目的を達成する
ために、本発明の請求項１では、変圧器の二次側の巻線
を三相負荷側と単相負荷側に分割し、一次側をデルタ、
二次側の三相負荷側をスターまたはデルタ、単相負荷側
をオープンデルタ結線とし、オープンデルタ結線の各相
は単相三線負荷を供給できるように中性点を引き出した
構造とする。In order to achieve the above object, according to claim 1 of the present invention, the winding of the secondary side of the transformer is divided into a three-phase load side and a single-phase load side, and the primary side is divided. Delta on the side,
The secondary three-phase load side has a star or delta, the single-phase load side has an open delta connection, and each phase of the open delta connection has a structure in which a neutral point is drawn so that a single-phase three-wire load can be supplied.
【０００５】請求項２の発明では、変圧器の二次側の巻
線を三相負荷側と単相負荷側に分割し、一次側をデル
タ、二次側の三相負荷側をスターまたはデルタ結線と
し、単相負荷側は単相三線負荷を供給できるように各巻
線の中央から端子を引き出し、全部一緒に結んで中性点
とし、各巻線の巻始めと巻終りの端子を起電力の位相順
に並べた結線構造とする。In the invention of claim 2, the secondary winding of the transformer is divided into a three-phase load side and a single-phase load side, the primary side is a delta, and the secondary side three-phase load side is a star or delta. Connect the wires, and on the single-phase load side, pull out the terminals from the center of each winding so that a single-phase three-wire load can be supplied, and tie them all together to form a neutral point. The wiring structure is arranged in the order of phases.
【０００６】請求項３の発明では、変圧器の一次側をデ
ルタ結線とし、二次側の各巻線を三分割してそれぞれ端
子を引き出し、各巻線の巻始めから２／３の所の端子同
志を全部一緒に結んで中性点とし、各巻線の巻始めと巻
終りの端子を起電力の位相順に並べ、各巻線の巻始めよ
り三相負荷を、各巻線の１／３の所の端子と巻終りの端
子および中性点より単相三線負荷を供給できる結線構造
とする。According to the third aspect of the invention, the primary side of the transformer is a delta connection, each winding on the secondary side is divided into three parts, and each terminal is led out. Connect all of them together as a neutral point, arrange the winding start and end terminals of each winding in the order of electromotive force phase, and apply a three-phase load from the beginning of each winding to the terminal at 1/3 of each winding. A connection structure that can supply a single-phase three-wire load from the terminal at the end of winding and the neutral point.
【０００７】[0007]
【発明の実施の形態】図１は本発明の請求項１に係る変
圧器の一実施形態を示す図である。この変圧器は二次側
の巻線ａを三相負荷側の巻線ａ１と単相負荷側の巻線ａ
２に分割した構成となっている。一次側をデルタ結線と
し、端子Ｕ，Ｖ，Ｗを引き出し、二次側の三相負荷側の
巻線ａ１はスター結線とし、端子ｕ，ｖ，ｗ，ｎ１を引
き出している。二次側の単相負荷側の巻線ａ２は、オー
プンデルタ結線とし、オープンデルタ結線の各巻線は、
それぞれ巻線の巻始めから端子ｘ１，ｙ１，ｚ１、巻線
の中央から端子ｎ２，ｎ３，ｎ４、巻線の巻終りから端
子ｘ２，ｙ２，ｚ２を引き出している。このため本発明
の請求項１に係る変圧器では、一台の変圧器をもって端
子ｕ，ｖ，ｗ，ｎ１で三相負荷を、端子ｘ１，ｎ２，ｘ
２、ｙ１，ｎ３，ｙ２およびｚ１，ｎ４，ｚ２でそれぞ
れ単相三線負荷を供給することができる。単相負荷側の
巻線ａ２はオープンデルタ結線であり、端子ｘ１，ｘ２
間の巻線が一次側の端子Ｕ，Ｖ間の巻線に、端子ｙ１，
ｙ２間の巻線が一次側の端子Ｖ，Ｗ間の巻線に、端子ｚ
１，ｚ２間の巻線が一次側の端子Ｗ，Ｕ間の巻線に対応
するため、単相負荷を各相でバランスよく取ることがで
き、三相の電圧不平衡を防ぐことができる。また、巻線
から引き出した端子はブッシングを介して、系統や負荷
に接続される。つまり、巻線から引き出した端子の数と
ブッシングの数は同じと言える。従って従来の受電また
は供給設備では、一次側ブッシングは三相変圧器が３
本、単相変圧器が各々２本ずつ３台で６本の計９本必要
であったが、本発明の請求項１の変圧器によれば、一次
側ブッシングは３本でよい。これは従来の１／３であ
る。1 is a diagram showing an embodiment of a transformer according to claim 1 of the present invention. In this transformer, the winding a on the secondary side has a winding a1 on the three-phase load side and the winding a1 on the single-phase load side.
It is divided into two parts. The primary side has a delta connection, the terminals U, V, W are drawn out, the secondary side three-phase load side winding a1 has a star connection, and the terminals u, v, w, n1 are drawn out. The winding a2 on the secondary-side single-phase load side is an open delta connection, and each winding of the open delta connection is
Terminals x1, y1, z1 are drawn from the beginning of winding, terminals n2, n3, n4 are drawn from the center of the winding, and terminals x2, y2, z2 are drawn from the end of winding. Therefore, in the transformer according to claim 1 of the present invention, one transformer is used to apply a three-phase load at the terminals u, v, w, and n1 and to the terminals x1, n2, and x.
2, y1, n3, y2 and z1, n4, z2 can each supply a single-phase three-wire load. The winding a2 on the single-phase load side is an open delta connection, and terminals x1 and x2
The winding between the terminals is a winding between the terminals U and V on the primary side.
The winding between y2 is the winding between the terminals V and W on the primary side, and the terminal z
Since the winding between 1 and z2 corresponds to the winding between the terminals W and U on the primary side, a single-phase load can be balanced in each phase and a three-phase voltage imbalance can be prevented. Further, the terminal drawn out from the winding is connected to the system and the load via the bushing. In other words, it can be said that the number of terminals drawn from the winding and the number of bushings are the same. Therefore, in the conventional power receiving or supplying equipment, the three-phase transformer has three
The number of the primary side bushings is 3, and the number of the single-phase transformers is 3 and the number of the single-phase transformers is 3, so that the total number of the primary side bushing is 3 in total. This is 1/3 of the conventional one.
【０００８】図２は本発明の請求項２に係る変圧器の一
実施形態を示す図である。この変圧器は二次側の巻線ａ
を三相負荷側の巻線ａ１と単相負荷側の巻線ａ２に分割
した構成となっている。一次側をデルタ結線とし、端子
Ｕ，Ｖ，Ｗを引き出し、二次側の三相負荷側の巻線ａ１
はスター結線とし、端子ｕ，ｖ，ｗ，ｎ１を引き出して
いる。単相負荷側の巻線ａ２は、それぞれ巻線の巻始め
から端子ｘ１，ｙ１，ｚ１、巻線の巻終りから端子ｘ
２，ｙ２，ｚ２を引き出し、各巻線の中央から引き出し
た端子は、全部一緒に結んで端子ｎ２としている。この
ため本発明の請求項２に係る変圧器では、一台の変圧器
をもって端子ｕ，ｖ，ｗ，ｎ１で三相負荷を、端子ｘ
１，ｎ２，ｘ２、ｙ１，ｎ２，ｙ２およびｚ１，ｎ２，
ｚ２でそれぞれ単相三線負荷を供給することができる。
単相負荷側の巻線ａ２は、端子ｘ１，ｘ２間の巻線が一
次側の端子Ｕ，Ｖ間の巻線に、端子ｙ１，ｙ２間の巻線
が一次側の端子Ｖ，Ｗ間の巻線におよび端子ｚ１，ｚ２
間の巻線が一次側の端子Ｗ，Ｕ間の巻線に対応している
ため、単相負荷を各相でバランスよく取ることができ、
三相の電圧不平衡を防ぐことができる。また、本発明の
請求項１の変圧器では、二次側ブッシングは三相負荷側
で４本、単相負荷側で９本の計１３本必要だが、本発明
の請求項２の変圧器では、三相負荷側で４本、単相負荷
側で７本の計１１本でよい。FIG. 2 is a diagram showing an embodiment of a transformer according to claim 2 of the present invention. This transformer has a secondary winding a
Is divided into a winding a1 on the three-phase load side and a winding a2 on the single-phase load side. The primary side is a delta connection, the terminals U, V, W are drawn out, and the secondary side three-phase load side winding a1
Is a star connection and the terminals u, v, w and n1 are drawn out. The winding a2 on the single-phase load side has terminals x1, y1, z1 from the beginning of winding and terminals x1 to y from the end of winding.
2, y2, z2 are drawn out, and the terminals drawn out from the center of each winding are all connected together to form a terminal n2. Therefore, in the transformer according to claim 2 of the present invention, one transformer is used to apply the three-phase load at the terminals u, v, w, and n1 and the terminal x.
1, n2, x2, y1, n2, y2 and z1, n2
Each z2 can supply a single-phase three-wire load.
Regarding the winding a2 on the single-phase load side, the winding between the terminals x1 and x2 is the winding between the terminals U and V on the primary side, and the winding between the terminals y1 and y2 is between the terminals V and W on the primary side. On winding and terminals z1, z2
Since the winding between them corresponds to the winding between the terminals W and U on the primary side, a single-phase load can be taken in good balance in each phase,
It is possible to prevent three-phase voltage imbalance. Further, in the transformer of claim 1 of the present invention, the secondary side bushing requires four on the three-phase load side and nine on the single-phase load side, for a total of thirteen, but in the transformer of claim 2 of the present invention. , Four on the three-phase load side and seven on the single-phase load side, for a total of eleven.
【０００９】図３は本発明の請求項３に係る変圧器の一
実施形態を示す図である。この変圧器は一次側をデルタ
結線とし、端子Ｕ，Ｖ，Ｗを引き出し、二次側の巻線ａ
の各巻線を３分割してそれぞれ巻線の巻始めから端子
ｕ，ｖ，ｗ、巻線の１／３の所から端子ｘ１，ｙ１，ｚ
１、巻線の巻終りから端子ｘ２，ｙ２，ｚ２を引き出
し、巻線の２／３の所から引き出した端子は全部一緒に
結んで端子ｎ１としている。このため本発明の請求項３
に係る変圧器では、一台の変圧器をもって端子ｕ，ｖ，
ｗ，ｎ１で三相負荷を、端子ｘ１，ｎ１，ｘ２、ｙ１，
ｎ１，ｙ２およびｚ１，ｎ１，ｚ２でそれぞれ単相三線
負荷を供給することができる。二次側の巻線ａは、端子
ｘ１，ｘ２間の巻線が一次側の端子Ｕ，Ｖ間の巻線に、
端子ｙ１，ｙ２間の巻線が一次側の端子Ｖ，Ｗ間の巻線
におよび端子ｚ１，ｚ２間の巻線が一次側の端子Ｗ，Ｕ
間の巻線に対応しているため、単相負荷を各相でバラン
スよく取ることができ、三相の電圧不平衡を防ぐことが
できる。また、本発明の請求項２の変圧器では、二次側
の巻線ａを三相負荷側の巻線ａ１と単相負荷側の巻線ａ
２に分割しているため、一次側とあわせて三巻線の変圧
器となるが、本発明の請求項３の変圧器では、二次側の
巻線ａを三相負荷側と単相負荷側に分割する必要がない
ため、一次側と合わせて二巻線の変圧器でよい。さら
に、本発明の請求項２の変圧器では、二次側ブッシング
は三相負荷側で４本、単相負荷側で７本の計１１本必要
だが、本発明の請求項３の変圧器では、端子ｎ１を三相
負荷側と単相負荷側で共用しているため、計１０本でよ
い。FIG. 3 is a diagram showing an embodiment of the transformer according to claim 3 of the present invention. In this transformer, the primary side has a delta connection, the terminals U, V and W are drawn out, and the secondary side winding a
Each of the windings is divided into three and terminals u, v, w from the beginning of the winding, and terminals x1, y1, z from 1/3 of the winding
1. The terminals x2, y2, z2 are drawn from the end of the winding, and the terminals drawn from 2/3 of the winding are all connected together to form a terminal n1. Therefore, claim 3 of the present invention
In the transformer according to the above, with one transformer, terminals u, v,
A three-phase load is connected to the terminals x1, n1, x2, y1, w, n1.
n1, y2 and z1, n1, z2 can each supply a single-phase three-wire load. In the secondary winding a, the winding between the terminals x1 and x2 is the winding between the terminals U and V on the primary side.
The winding between the terminals y1 and y2 is the winding between the terminals V and W on the primary side, and the winding between the terminals z1 and z2 is the terminals W and U on the primary side.
Since it corresponds to the windings between, the single-phase load can be balanced in each phase, and the three-phase voltage imbalance can be prevented. Further, in the transformer of claim 2 of the present invention, the winding a on the secondary side is the winding a1 on the three-phase load side and the winding a on the single-phase load side.
Since it is divided into two, it becomes a three-winding transformer together with the primary side. However, in the transformer of claim 3 of the present invention, the winding a on the secondary side has a three-phase load side and a single-phase load side. Since there is no need to divide into two sides, a two-winding transformer may be used together with the primary side. Furthermore, in the transformer of claim 2 of the present invention, the secondary side bushing requires four on the three-phase load side and seven on the single-phase load side, for a total of eleven, but in the transformer of claim 3 of the present invention. Since the terminal n1 is shared by the three-phase load side and the single-phase load side, a total of ten terminals will suffice.
【００１０】[0010]
【発明の効果】以上のように、本発明の請求項１に係る
供給設備では、変圧器は１台で良いため、受電または供
給設備の設置スペースはこれまでより遥かにすくなくて
すむので、これまでスペースが狭く設置できなかったビ
ルなどの電気室に収納が可能になる。また、変圧器の台
数が減るため変圧器の製作コスト、輸送コスト、据付工
事コストが大幅に削減できる。さらに、変圧器の一次側
のブッシングの数が従来の１／３になるため、変圧器の
製作コストの削減に大きな効果を奏する。As described above, in the supply equipment according to claim 1 of the present invention, since only one transformer is required, the installation space of the power receiving or supply equipment can be much smaller than before. It can be stored in an electric room such as a building where the space could not be set up. Also, because the number of transformers is reduced, the manufacturing costs, transportation costs, and installation work costs of transformers can be significantly reduced. Further, since the number of bushings on the primary side of the transformer is 1/3 of the conventional one, it is very effective in reducing the manufacturing cost of the transformer.
【００１１】請求項１に比べ請求項２は変圧器の二次側
のブッシングの数がすくなくてすむため、変圧器のさら
なる小型化と製作コストの削減がはかれる。According to the second aspect of the present invention, the number of bushings on the secondary side of the transformer is smaller than that of the first aspect, so that the transformer can be further downsized and the manufacturing cost can be reduced.
【００１２】請求項２に比べ、請求項３は三巻線が二巻
線になることおよび、変圧器のブッシングの数がさらに
すくなくてすむため、変圧器のさらなる小型化と製作コ
ストの削減がはかれる。Compared to claim 2, in claim 3, since three windings are two windings and the number of bushings of the transformer can be further reduced, further downsizing of the transformer and reduction of manufacturing cost can be achieved. Be peeled off.
【図１】本発明の請求項１の一実施形態を示す変圧器の
構成図である。FIG. 1 is a configuration diagram of a transformer showing an embodiment of claim 1 of the present invention.
【図２】本発明の請求項２の一実施形態を示す変圧器の
構成図である。FIG. 2 is a configuration diagram of a transformer showing an embodiment of claim 2 of the present invention.
【図３】本発明の請求項３の一実施形態を示す変圧器の
構成図である。FIG. 3 is a configuration diagram of a transformer showing an embodiment of claim 3 of the present invention.
【図４】従来の受電または供給設備の構成図である。FIG. 4 is a configuration diagram of a conventional power receiving or supplying facility.
ａ 巻線（二次側） ａ１ 巻線（三相負荷側） ａ２ 巻線（単相負荷側） ｎ１，ｎ２，ｎ３，ｎ４ 端子（中性点） a Winding (secondary side) a1 winding (three-phase load side) a2 winding (single-phase load side) n1, n2, n3, n4 terminals (neutral point)
Claims (3)
負荷側の巻線に分割し、一次側をデルタ、二次側の三相
負荷側の巻線をスターまたはデルタ、単相負荷側の巻線
をオープンデルタ結線とし、単相負荷側の巻線はそれぞ
れ単相三線負荷を３回路供給できるように中性点を引き
出した構造とした変圧器。1. A secondary side winding is divided into a three-phase load side winding and a single-phase load side winding, the primary side is a delta, and the secondary side three-phase load side winding is a star or Delta and single-phase load side windings are open delta connection, the single-phase load side winding is a transformer with a neutral point so that three circuits of single-phase three-wire loads can be supplied.
負荷側の巻線に分割し、一次側をデルタ、二次側の三相
負荷側の巻線をスターまたはデルタ結線とし、単相負荷
側の巻線は単相三線負荷を３回路供給できるように各巻
線の中央から端子を引き出し、全部一緒に結んで中性点
とし、各巻線の巻始めと巻終りの端子を起電力の位相順
に並べた結線とした変圧器。2. A secondary side winding is divided into a three-phase load side winding and a single-phase load side winding, the primary side is a delta, and the secondary side three-phase load side winding is a star or Delta connection, and the winding on the single-phase load side draws terminals from the center of each winding so that three circuits of single-phase three-wire load can be supplied, and tie them all together to make a neutral point. A transformer in which the terminals of are connected in the order of electromotive force phases.
の巻線をそれぞれ３分割して端子を引き出し、各巻線の
巻始めから２／３の所の端子同志を全部一緒に結んで中
性点とし、各巻線の巻始めと巻終りの端子を起電力の位
相順に並べ、各巻線の巻始めより三相負荷を、各巻線の
１／３の所の端子と巻終りの端子および中性点より単相
三線負荷を３回路供給できる結線とした変圧器。3. The primary winding is delta connected, the secondary winding is divided into three parts to draw out the terminals, and the terminals at 2/3 of the beginning of each winding are all connected together. At the neutral point, the winding start and end terminals of each winding are arranged in the order of the electromotive force phase, and a three-phase load is applied from the beginning of each winding to the terminal at 1/3 of the winding and the terminal at the end of the winding. And a transformer with a connection that can supply three circuits of a single-phase three-wire load from the neutral point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32917298A JP3381645B2 (en) | 1998-11-19 | 1998-11-19 | Transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32917298A JP3381645B2 (en) | 1998-11-19 | 1998-11-19 | Transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000156979A JP2000156979A (en) | 2000-06-06 |
| JP3381645B2 true JP3381645B2 (en) | 2003-03-04 |
Family
ID=18218457
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32917298A Expired - Fee Related JP3381645B2 (en) | 1998-11-19 | 1998-11-19 | Transformer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3381645B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101996747B (en) * | 2010-10-08 | 2012-07-25 | 南京苏特电气股份有限公司 | Lead wire resistance balancing method of low-voltage Y connecting wire of triangular transformer |
| CN102097202B (en) * | 2010-12-06 | 2012-05-23 | 薛建仁 | Low-voltage balancing outlet method for triangular transformer |
-
1998
- 1998-11-19 JP JP32917298A patent/JP3381645B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000156979A (en) | 2000-06-06 |
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