JPH01107507A - Three-phase transformer with tertiary winding - Google Patents
Three-phase transformer with tertiary windingInfo
- Publication number
- JPH01107507A JPH01107507A JP26376287A JP26376287A JPH01107507A JP H01107507 A JPH01107507 A JP H01107507A JP 26376287 A JP26376287 A JP 26376287A JP 26376287 A JP26376287 A JP 26376287A JP H01107507 A JPH01107507 A JP H01107507A
- Authority
- JP
- Japan
- Prior art keywords
- winding
- tertiary
- cylindrical
- leads
- layer
- 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.)
- Pending
Links
- 238000004804 winding Methods 0.000 title claims abstract description 173
- 239000004020 conductor Substances 0.000 claims description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 230000000630 rising effect Effects 0.000 abstract description 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 33
- 230000007935 neutral effect Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 5
- 230000004907 flux Effects 0.000 description 4
- 230000016507 interphase Effects 0.000 description 4
- 238000009413 insulation Methods 0.000 description 3
- 125000006850 spacer group Chemical group 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000009193 crawling Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
Landscapes
- Coils Of Transformers For General Uses (AREA)
Abstract
Description
【発明の詳細な説明】 〔発明の目的〕 (産業上の利用分野) 本発明は三次巻線付三相変圧器に関するものである。[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a three-phase transformer with a tertiary winding.
(従来の技術)
一般に三相変圧器の三次巻線には、並列導体を軸方向に
並べて巻回した一層の円筒巻線が使用される。この場合
には巻端は巻線の上下に位置するため、下部の口出しは
巻線相聞部で上部へ立ち上げる必要がある。また、タッ
プ巻線には、各タップを構成する複数本の導体を軸方向
に並べて巻回する並べ巻円筒巻線が使用されることが多
いが、この場合にも′、並べて巻かれる各タップを直列
に接続するために巻線相間部でリードを上部へ立ち上げ
る必要が゛ある。この立ち上げリードの数は、上記の各
タップを構成する素線本数をNとすれば、(N−1)本
となり、一般にタップの点数が多くなるほど増加する。(Prior Art) Generally, a single-layer cylindrical winding in which parallel conductors are wound in parallel in the axial direction is used for the tertiary winding of a three-phase transformer. In this case, since the ends of the windings are located above and below the windings, it is necessary to raise the lower part of the windings to the upper part at the phase part of the windings. In addition, tap winding often uses side-by-side cylindrical winding, in which multiple conductors constituting each tap are wound side by side in the axial direction. In order to connect the windings in series, it is necessary to raise the leads upward between the winding phases. The number of start-up leads is (N-1), where N is the number of strands constituting each tap, and generally increases as the number of taps increases.
通常、三次巻線が付くような変圧器の場合には、巻線数
が多いため上記の相間部におけるリードの立ち上げがス
ペース的に困難となりまた構造的にも複雑となる。これ
に対処するためには、巻線とタンク間の寸法を増やせば
よいが1重量・油量が増加すると共に、輸送寸法が増大
する。Normally, in the case of a transformer with a tertiary winding, the number of windings is large, so it becomes difficult to set up the leads in the interphase portion due to the space and the structure is complicated. In order to deal with this, the size between the winding and the tank can be increased, but this increases the weight and amount of oil and also increases the transportation size.
大容量の電力用変圧器の場合、三次巻線は一般に電圧が
11〜30KV程度と低いため、電流は数KA程度とな
る。また、並べ巻円筒タップ巻線を流れる電流はたかだ
か1〜2KA程度であるが、上下渡りのリードについて
は、各リードの電流が重畳して漏れ磁束が発生するため
、数にA〜十数KAの電流が流れるリードがあるのと等
価になる場合がある。In the case of a large-capacity power transformer, the voltage of the tertiary winding is generally as low as about 11 to 30 KV, so the current is about several KA. In addition, the current flowing through the side-by-side cylindrical tap windings is about 1 to 2 KA at most, but for the upper and lower leads, the currents of each lead are superimposed and leakage magnetic flux is generated, so the current is about 1 to 10 KA. This may be equivalent to having a lead through which a current of
このような大電流リードが引き出される部分やタンクに
沿って立ち上げられる部分では、その漏れ磁束によって
、タンクやその他の近接構造物に渦電流損を発生させる
。At a portion where such a large current lead is drawn out or raised along the tank, leakage magnetic flux causes eddy current loss in the tank or other nearby structures.
これらの問題点を解決するために従来は、三次円筒巻線
や並べ巻円筒タップ巻線に第2図に示すような二層構造
の円筒巻線が用いられる。この巻線は複数本の導体を軸
方向に並べて上部より下部へ巻回し、第−巻線層21を
形成し巻き終りの下端では、最初に巻き終る導体より順
次第二巻線!22へ渡り、第二巻線層22は油量・絶縁
確保のためのスペーサ23を介して第−巻線層21の上
に下部から上部に向けて巻回される。このような構造か
ら巻線の口出し24.25は共に上部側より引き出され
るため、巻線の口出しを相間部より立ち上げる必要がな
くなり、またタンク壁や口出し近傍の構造物での渦電流
損を低減することができる。In order to solve these problems, conventionally, a two-layer cylindrical winding as shown in FIG. 2 has been used as a tertiary cylindrical winding or a side-by-side cylindrical tap winding. This winding is made by arranging a plurality of conductors in the axial direction and winding them from the top to the bottom to form the second winding layer 21, and at the bottom end of the winding, two windings are made in order from the conductor that is wound first! 22, the second winding layer 22 is wound on top of the second winding layer 21 from the bottom to the top via a spacer 23 for ensuring the amount of oil and insulation. Because of this structure, the winding leads 24 and 25 are both pulled out from the upper side, so there is no need to raise the winding leads from the interphase part, and eddy current loss on the tank wall and structures near the leads can be reduced. can be reduced.
第2図には、軸方向に並べて巻かれる導体の数が4本の
場合を示しており、これを並列導体とした場合には通常
の円筒巻線と同様となり、上部で各導体が直列になるよ
うに接続することにより並べ巻円筒巻線と同様となる。Figure 2 shows a case where the number of conductors wound in parallel in the axial direction is four. If these are used as parallel conductors, it will be the same as a normal cylindrical winding, and each conductor will be connected in series at the top. By connecting them so that
(発明が解決しようとする問題点)
第3図に三次円筒巻線及び並べ巻円筒タップ巻線に第2
図の二層巻線構造を採用した場合の従来例を示す、鉄心
1に内側より三角結線される三次巻線第1巻線層2、第
2巻線層3、タップ巻線第1巻線層4、第2巻線層5、
星形結線される低圧巻線61巻線中央部より線路端口出
しを引き出した(上下振分構造)星形結線される高圧巻
線7が同心状に巻装され、三次巻線2,3の口出し8゜
9、タップ巻線4,5の口出し10.11.低圧巻線6
の結線端口出し12、および高圧巻線の中性点口出し1
3の一方は上部より引き出され、高圧巻線7の線路端口
出し14は巻線中央部より引き出され、低圧巻線6の中
性点側口出し15および高圧巻線7の中性点側口出し1
3の他の一方は下部より引き出されている。この場合の
変圧器の一般的なブッシング配置の例を第4図に示す6
本体タンク15の長辺側の一辺に高圧ブッシング16.
他辺に低圧ブッシング17、短辺側の一端に三次ブッシ
ング18.他端に三相用負荷時タップ切換器19が配置
される。(Problems to be Solved by the Invention) Fig. 3 shows a tertiary cylindrical winding, a side-by-side cylindrical tap winding, and a secondary cylindrical tap winding.
The figure shows a conventional example when the two-layer winding structure is adopted, and shows a tertiary winding first winding layer 2, a second winding layer 3, and a tap winding first winding, which are triangularly connected to the iron core 1 from the inside. layer 4, second winding layer 5,
The low voltage winding 61 is connected in a star shape.The high voltage winding 7 is connected in a star shape, with the line end outlet drawn out from the center of the winding (vertical distribution structure). Leading out 8°9, leading out of tap windings 4 and 5 10.11. Low voltage winding 6
connection end outlet 12 and high voltage winding neutral point outlet 1
3 is pulled out from the top, the line end outlet 14 of the high voltage winding 7 is pulled out from the center of the winding, the neutral point side outlet 15 of the low voltage winding 6 and the neutral point side outlet 1 of the high voltage winding 7.
The other end of 3 is pulled out from the bottom. An example of the general bushing arrangement of the transformer in this case is shown in Fig. 6.
A high pressure bushing 16 is attached to one long side of the main body tank 15.
Low pressure bushing 17 on the other side, tertiary bushing 18 on one end of the short side. A three-phase on-load tap changer 19 is arranged at the other end.
この場合1巻線上部の鉄心とタンクの間を通して三相共
に、三次巻線の口出し8,9は三次ブッシング18側へ
、タップ巻線口出し10.11はタップ切換器19側へ
這うまわす必要がある6本体タンク15の長辺側の高圧
ブッシング16側の上部は、結線階級の低い高圧巻線の
中性点リードが通るだけで比較的スペースがあり、上記
三次巻線の接続リードまたはタップ巻線接続リードのど
ちらかを通す余裕があるが、低圧ブッシング17側は、
もともと比較的電圧の高い低圧巻線の線路端口出し12
が低圧ブッシング17に接続するために通るため、三次
巻線の接続リードまたはタップ巻線接続リードの残りの
一方を這いまわすことが非常に困難になるという問題点
があった。In this case, it is necessary to pass between the iron core at the top of the first winding and the tank for all three phases, the tertiary winding leads 8 and 9 to the tertiary bushing 18 side, and the tap winding leads 10 and 11 to the tap changer 19 side. The upper part of the high-voltage bushing 16 on the long side of the 6-body tank 15 has a relatively large space through which the neutral point lead of the high-voltage winding with a low connection class passes, and the connecting lead of the tertiary winding or the tap winding. There is room to pass either of the wire connection leads, but on the low pressure bushing 17 side,
Line end exit 12 of low voltage winding which originally has relatively high voltage
There is a problem in that it becomes very difficult to pass around the remaining one of the tertiary winding connection lead or the tap winding connection lead because it passes to connect to the low voltage bushing 17.
本発明の目的は、巻線リードの立ち上げを少なくするこ
とにより、タンク及び口出し近傍構造物の渦電流損が少
なく、また、タンク内のリードの這いまわしが容易で輸
送寸法を小さくできる、コンパクトな三次巻線付三相変
圧器を提供することである。The purpose of the present invention is to reduce eddy current loss in the tank and structures near the outlet by reducing the rise of the winding leads, and to make it compact and easy to move around the leads in the tank, reducing the size of transportation. An object of the present invention is to provide a three-phase transformer with a tertiary winding.
(問題点を解決するための手段)
本発明による三相変圧器は、タンク内に配置された三相
鉄心に複数本の並列導体を軸方向に並べて巻回してなる
二個の巻線層を直列接続してなる三次円筒巻線と各タッ
プを構成する複数本の導体を軸方向に並べて巻回してな
る二個の巻線層を直列接続してなる並べ巻円筒タップ巻
線と低圧巻線。(Means for Solving the Problems) A three-phase transformer according to the present invention has two winding layers formed by winding a plurality of parallel conductors arranged in the axial direction around a three-phase core placed in a tank. A tertiary cylindrical winding connected in series and two winding layers formed by axially winding multiple conductors forming each tap are connected in series to form a side-by-side cylindrical tap winding and low voltage winding. .
高圧巻線とを各相それぞれ同心配置したものにおいて、
上記各相の三次円筒巻線は第一及び第二巻線層の巻始め
と巻終りをそれぞれ上端部にもち。In the case where high voltage windings are arranged concentrically for each phase,
The tertiary cylindrical winding of each phase has a winding start and a winding end of the first and second winding layers at the upper ends, respectively.
かつ下端にて互いに直列に接続され、第−巻線組及び第
二巻線層の口出しリードはそれぞれ上方に引き出された
ものとし、上記各相の並べ巻円筒タップ巻線は第1及び
第2巻線層の巻始めと巻終りをそれぞれ下端部にもち、
かつ上端にて互いに直列に接続され、第1巻線層及び第
2巻線層の口出しリードは、それぞれ下方に引き出され
たものとすることを特徴とする。The leads of the first winding set and the second winding layer are connected to each other in series at the lower ends, and the lead leads of the first winding set and the second winding layer are respectively pulled out upward, and the side-by-side cylindrical tap windings of each phase are connected to the first and second winding layers. The winding layer has the winding start and winding end at the lower end,
The windings are connected in series to each other at the upper ends, and the lead leads of the first winding layer and the second winding layer are each pulled out downward.
(作用)
この様な構成とすることにより、相間部より立ち上げる
リードの数を減らすことができ、タンク及び口出し近傍
の構造物に発生する渦電流損も低減することができる。(Function) With this configuration, the number of leads raised from the interphase portion can be reduced, and eddy current loss generated in the tank and structures near the outlet can also be reduced.
また、タンク内のリード線の這いまわしを容易にするこ
とが可能で、輸送寸法の小さなコンパクトな三次巻線付
三相変圧器の供給を実現できる。Furthermore, it is possible to easily move the lead wires around inside the tank, and it is possible to supply a compact three-phase transformer with a tertiary winding that is small in transportation size.
(実施例)
以下本発明の三次巻線付三相変圧器を第1図を用いて説
明する。(Example) A three-phase transformer with a tertiary winding according to the present invention will be described below with reference to FIG.
第1図においては、鉄心1に内側より三角結線される三
次円筒巻線第一巻線層2、第二巻線層3、並べ巻円筒タ
ップ巻線第−巻線層4、第二巻線層5、星形結線される
低圧巻線6、上下振分構造の星形結線される高圧巻線°
7が同心状に巻装され。In FIG. 1, tertiary cylindrical windings are triangularly connected from the inside to the iron core 1, a first winding layer 2, a second winding layer 3, a side-by-side cylindrical tap winding, a first winding layer 4, and a second winding layer. Layer 5, star-connected low-voltage winding 6, star-connected high-voltage winding with vertical distribution structure
7 are wound concentrically.
上記三次円筒巻線2,3は巻始め巻終りを共に上部に持
ち、下端にて互いに直列に接続され、その口出しり−ド
8,9は共に上方に引き出され、上記並べ巻円筒タップ
巻線4,5は巻始め・巻終りを共に下部に持ち、上端に
て互いに直列に接続され、その口出しり−ド10.11
は共に下方に引き出されている。The above-mentioned tertiary cylindrical windings 2 and 3 have both the beginning and the end of the winding at the top, and are connected to each other in series at the lower ends, and the lead wires 8 and 9 are both drawn upward, and the above-mentioned side-by-side winding cylindrical tap winding 4 and 5 have the winding start and winding end both at the bottom, and are connected in series to each other at the upper end, and the lead wire 10.11
are both pulled downward.
三次円筒巻線2,3および並べ巻円筒タップ巻線4,5
に二層構造の円筒巻線を採用していることにより、相間
部での立上がりリードの数を減らすことができること、
また、それに伴ないタンクおよび口出し近傍の構造物で
の口出しリードによるもれ磁束のための渦電流損を減ら
すことができることは先に説明したため、ここでは、本
発明により従来以上にタンク内でのリード這いまわしを
容易にできることを説明する。Tertiary cylindrical windings 2, 3 and side-by-side cylindrical tap windings 4, 5
By adopting a two-layer cylindrical winding, the number of rising leads in the interphase area can be reduced.
In addition, as previously explained, it is possible to reduce eddy current loss due to leakage magnetic flux due to lead leads in the tank and structures near the lead. Explain that leash crawling can be made easier.
この場合も変圧器の各ブッシングの配置は第4図を例に
とって考える6巻線上部の鉄心とタンクの間を通して、
三相共に三次円筒巻線2,3の口出し8,9を三次ブッ
シング18側へ、並べ巻円筒タップ巻線4,5の口出し
10.11をタップ切換器19側へ這いまわす際、本体
タンク15の長辺側の高圧ブッシング16側の上部は、
絶縁階級の低い高圧巻線の中性点リードが通るだけであ
り、上部より巻線口出しされている三次巻線接続リード
を容易に通すことができる。また、三次巻線の口出しり
−ド8,9よりブッシングまで接続される各相2本ずつ
のリードをできるだけ平行させて配置することにより、
互いのリード電流によるもれ磁束を相殺できるため、周
辺構造物やタンクに発生する渦電流損を低減できる。In this case as well, the arrangement of each bushing of the transformer is as follows, taking Figure 4 as an example:
When extending the openings 8 and 9 of the tertiary cylindrical windings 2 and 3 to the tertiary bushing 18 side for all three phases, and the openings 10 and 11 of the side-by-side wound cylindrical tap windings 4 and 5 to the tap changer 19 side, The upper part of the high pressure bushing 16 side on the long side is
Only the neutral point lead of the high-voltage winding with a low insulation class passes through it, and the tertiary winding connection lead, which is exposed from the upper part of the winding, can be easily passed through. In addition, by arranging the two leads of each phase connected from the output leads 8 and 9 of the tertiary winding to the bushing as parallel as possible,
Since leakage magnetic flux caused by each lead current can be canceled out, eddy current loss generated in surrounding structures and tanks can be reduced.
一方、タップ巻線の口出しリード10.11は、タップ
巻84.5の下部より口出しされているため、口出し近
傍でタップ間の渡り接続を行なった後、タンク長近側の
巻線下部の鉄心とタンク間を通して三相負荷時タップ切
換器19へ接続する必要がある0巻線下部には、高圧ブ
ッシング16側には高圧巻線の中性点リード、低圧ブッ
シング17側には低圧巻線の中性点リードと共に絶縁階
級の低いリードしかないため、どちら側、または両側を
使ってタップ巻線接続リードを通し負荷時タップ切換器
19へ接続することは容易である。またタップ巻線4.
5から負荷時タップ切換器19への接続へは各相共に、
(N+1)本ものリードが接続されるが、タップ間での
渡り接続は口出し近傍で行なうため。On the other hand, the tap winding lead 10.11 is brought out from the bottom of the tap winding 84.5, so after making the crossover connection between the taps near the lead, the iron core at the bottom of the winding near the tank length is At the bottom of the 0 winding, which needs to be connected to the three-phase load tap changer 19 through the tank and tank, the neutral point lead of the high voltage winding is on the high voltage bushing 16 side, and the low voltage winding's lead is on the low voltage bushing 17 side. Since there is only a lead with a low insulation class along with the neutral point lead, it is easy to connect to the on-load tap changer 19 through the tap winding connection lead using either side or both sides. Also tap winding 4.
5 to the on-load tap changer 19 for each phase,
(N+1) leads are connected, but the crossover connections between taps are made near the openings.
電流はこのうちの1本に流れるにすぎず、この部分の渦
電流損が問題となるようなことはない。Current only flows through one of these lines, and eddy current loss in this part does not pose a problem.
以上説明したように、本発明によれば1巻線リードの相
間部の立ち上げを少なくすることができ。As explained above, according to the present invention, it is possible to reduce the rise in the phase-to-phase portion of one winding lead.
それによりタンク及び口出し近傍構造物の渦電流損が少
なく、しかもリードの這いまわしを容易にし、輸送寸法
の小さな、コンパクトな三次巻線付三相変圧器を提供す
ることができる。As a result, it is possible to provide a compact three-phase transformer with a tertiary winding, which has less eddy current loss in the tank and the structures near the outlet, makes it easy to move the leads around, and is small in transportation size.
第1図は本発明の一実施例を示す結線図、第2図は二層
巻線構造の構造図、第3図は従来の三相変圧器の一例を
示す結線図、第4図は三相変圧器のブッシング、負荷時
タップ切換器の配置の一例を示す平面図である。
1・・・鉄心、
2・・・三次円筒巻線第一巻線層、
3・・・同第二巻線層。
4・・・並べ巻円筒タップ巻線第−巻線層、5・・・同
第二巻線層、 6・・・低圧巻線、7・・・高圧巻線、
8,9・・・三次巻線口出し、10.11・・・
タップ巻線口出し、
12・・・低圧巻線線路端口出し。
13・・・高圧巻線中性点端口出し、
14・・・高圧巻線線路端口出し。
15・・・低圧巻線中性点端口出し。
16・・・高圧ブッシング、17・・・低圧ブッシング
、18・・・三次ブッシング、
19・・・三相用負荷時タップ切換器。
21・・・二層構造円筒巻線の第−層、22・・・二層
構造円筒巻線の第二層。
23・・・スペーサ、 24.25・・・口出し。
代理人 弁理士 則 近 憲 佑
同 第子丸 健
第1図
第3図
第 2 図
り/b
第4図Fig. 1 is a wiring diagram showing an embodiment of the present invention, Fig. 2 is a structural diagram of a two-layer winding structure, Fig. 3 is a wiring diagram showing an example of a conventional three-phase transformer, and Fig. 4 is a wiring diagram showing an example of a conventional three-phase transformer. It is a top view which shows an example of arrangement|positioning of the bushing of a phase transformer, and an on-load tap changer. DESCRIPTION OF SYMBOLS 1... Iron core, 2... The tertiary cylindrical winding first winding layer, 3... The same second winding layer. 4... Second winding layer of side-by-side winding cylindrical tap winding, 5... Second winding layer, 6... Low voltage winding, 7... High voltage winding,
8, 9...Tertiary winding lead, 10.11...
Tap winding lead out, 12...Low voltage winding line end lead out. 13... High voltage winding neutral point end exit, 14... High voltage winding line end exit. 15...Low voltage winding neutral point end exit. 16...High pressure bushing, 17...Low pressure bushing, 18...Tertiary bushing, 19...Three-phase on-load tap changer. 21... The second layer of the two-layer structure cylindrical winding, 22... The second layer of the two-layer structure cylindrical winding. 23... Spacer, 24.25... Opening. Agent Patent Attorney Yudo Ken Chika Ken Daishimaru Fig. 1 Fig. 3 Fig. 2 Diagram/b Fig. 4
Claims (1)
列接続してなる三次円筒巻線と各タップを構成する複数
本の導体を軸方向に並べて巻回してなる二個の巻線層を
直列接続してなる並べ巻円筒タップ巻線と低圧巻線、高
圧巻線とを各相それぞれ同心配置した三次巻線付三相変
圧器において、上記各相の三次円筒巻線は第一及び第二
巻線層の巻始めと巻終りをそれぞれ上端部にもち、かつ
下端にて互いに直列に接続し、第一巻線層及び第二巻線
層の口出しリードはそれぞれ上方に引き出し、上記各相
の並べ巻円筒タップ巻線は第1及び第2巻線層の巻始め
と巻終りをそれぞれ下端部にもち、かつ上端にて互いに
直列に接続し、第一巻線層及び第二巻線層の口出しリー
ドは、それぞれ下方に引き出したことを特徴とする三次
巻線付三相変圧器。1) A tertiary cylindrical winding made by connecting two winding layers in series around a three-phase iron core placed in a tank, and two cylindrical windings made by winding multiple conductors configuring each tap in parallel in the axial direction. In a three-phase transformer with a tertiary winding in which a side-by-side cylindrical tap winding formed by connecting winding layers in series, a low voltage winding, and a high voltage winding are arranged concentrically for each phase, the tertiary cylindrical winding of each phase is The winding start and winding ends of the first and second winding layers are held at the upper end, and are connected in series to each other at the lower end, and the lead leads of the first winding layer and the second winding layer are respectively pulled out upward. , the side-by-side wound cylindrical tap windings of each phase have the winding start and winding end of the first and second winding layers at the lower end, respectively, and are connected in series to each other at the upper end, and the first winding layer and the winding end are connected to each other in series at the upper end. A three-phase transformer with a tertiary winding characterized in that the output leads of the two winding layers are each pulled out downward.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP26376287A JPH01107507A (en) | 1987-10-21 | 1987-10-21 | Three-phase transformer with tertiary winding |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP26376287A JPH01107507A (en) | 1987-10-21 | 1987-10-21 | Three-phase transformer with tertiary winding |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH01107507A true JPH01107507A (en) | 1989-04-25 |
Family
ID=17393929
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP26376287A Pending JPH01107507A (en) | 1987-10-21 | 1987-10-21 | Three-phase transformer with tertiary winding |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH01107507A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110084790A1 (en) * | 2009-10-13 | 2011-04-14 | Tsai-Hsiang Chen | Neutral-grounded structure for delta-connected windings and method thereof |
CN106449070A (en) * | 2016-09-30 | 2017-02-22 | 宁波三星医疗电气股份有限公司 | Current transformer and coil winding method thereof |
-
1987
- 1987-10-21 JP JP26376287A patent/JPH01107507A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110084790A1 (en) * | 2009-10-13 | 2011-04-14 | Tsai-Hsiang Chen | Neutral-grounded structure for delta-connected windings and method thereof |
CN106449070A (en) * | 2016-09-30 | 2017-02-22 | 宁波三星医疗电气股份有限公司 | Current transformer and coil winding method thereof |
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