JPS5913313A - Correction of d.c. field distortion in transformer - Google Patents
Correction of d.c. field distortion in transformerInfo
- Publication number
- JPS5913313A JPS5913313A JP12340482A JP12340482A JPS5913313A JP S5913313 A JPS5913313 A JP S5913313A JP 12340482 A JP12340482 A JP 12340482A JP 12340482 A JP12340482 A JP 12340482A JP S5913313 A JPS5913313 A JP S5913313A
- Authority
- JP
- Japan
- Prior art keywords
- current
- transformer
- band
- field distortion
- variable
- 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.)
- Granted
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
- H01F27/38—Auxiliary core members; Auxiliary coils or windings
- H01F27/385—Auxiliary core members; Auxiliary coils or windings for reducing harmonics
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Regulation Of General Use Transformers (AREA)
Abstract
Description
【発明の詳細な説明】
この発明は、サイリスタ・インバータで励磁される変圧
器やサイリスタ・コンバータを負荷とする変圧器に生じ
る鉄心内磁束の直流偏磁矯正方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for correcting DC bias in magnetic flux within an iron core generated in a transformer excited by a thyristor inverter or a transformer whose load is a thyristor converter.
サイリスタ・インバータで励磁される変圧器やサイリス
タ・コンバータを負荷とする変圧器では、サイリスタ点
弧位相角の不揃いや、サイリスタ・ダイオードの順方向
電圧降下の不揃いなどにより、励磁電圧波形の+、 −
に不平衡を生じたり、負荷電流の+、−に不平衡を生じ
る。このために変圧器巻線には直流電流が流れることに
なり、この直流電流によって変圧器鉄心内には直流磁束
が発生し、変圧器巻線端子電圧に対応した交流磁束に前
記直流磁束が重畳される。この状態を直流偏磁と称する
。直流偏磁を生じると、鉄損が増加する、励磁電流が増
加する、磁歪が増加する、結果として変圧器騒音か増加
するなどの悪影響が生じる。変圧器鉄心の鉄損、励磁電
流、磁歪の大きさは印加交流電圧に対応する磁束密度に
よって太き(変化し、例えば磁束密度’i7.7(T)
から1.t、y(T:lに10%下げると、電力用変圧
器鉄心として通常用いられる方向性ケイ素鋼板では鉄損
が約25%減少し、励磁電流は約70%減少する。In a transformer excited by a thyristor inverter or a transformer whose load is a thyristor converter, the excitation voltage waveform may vary between + and - due to irregularities in the thyristor firing phase angle and irregularities in the forward voltage drop of the thyristor diode.
This may cause an unbalance in the load current, or an imbalance in the + and – load currents. For this reason, a DC current flows through the transformer windings, and this DC current generates DC magnetic flux in the transformer core, and the DC magnetic flux is superimposed on the AC magnetic flux corresponding to the transformer winding terminal voltage. be done. This state is called DC biased magnetism. When DC bias magnetization occurs, adverse effects such as increased core loss, increased excitation current, increased magnetostriction, and, as a result, increased transformer noise occur. The magnitudes of iron loss, exciting current, and magnetostriction in the transformer core vary depending on the magnetic flux density corresponding to the applied AC voltage. For example, the magnetic flux density 'i7.7 (T)
From 1. When t, y (T:l is lowered by 10%, the iron loss decreases by about 25% and the excitation current decreases by about 70% in grain-oriented silicon steel sheets commonly used as power transformer cores.
これらのことから、従来は印加交流電圧に対応する磁束
密度を下けることによって直流偏磁による鉄損、励磁電
流などの特性の悪化を相殺する方法がとられていた。磁
束密度を下げることは結果として変圧器の寸法を大きく
することになり、省資源上の観点から好ましくない。ま
た変圧器据え付は地点までの輸送条件によっては、輸送
上の問題が生じる。For these reasons, conventional methods have been used to offset the deterioration of characteristics such as iron loss and excitation current due to DC bias magnetization by lowering the magnetic flux density corresponding to the applied AC voltage. Lowering the magnetic flux density results in an increase in the size of the transformer, which is undesirable from the viewpoint of resource conservation. Additionally, installing a transformer may pose transportation problems depending on the transportation conditions to the location.
この発明は、以上の点に鑑み、発生する直流偏磁を積極
的に矯正する方法全提供するものである。In view of the above points, the present invention provides a method for actively correcting the DC bias magnetization that occurs.
δ コ■、コWは変圧器鉄心に巻回された/次巻線、JU。δ Co■, CoW are the/next windings wound around the transformer core, JU.
3■、3Wは1次側巻@2TJ、 、2V、 JWK流
れる電流を検出するための変流器、IU、ダv、pwは
変流器JU。3■, 3W are primary windings @2TJ, , 2V, JWK current transformers for detecting the flowing current, IU, dav, pw are current transformers JU.
3V、JWによって検出された電流の第コ高調波を取り
出すための帯域フィルタ1.ltU、 、ltV、 &
Wは帯域フィルタ41U、ダV、4IWによって取り出
された第=調波電流を信号入力とし、同信号入力に応じ
た直流出力を発生し℃変圧器鉄心/に巻回した付加巻線
AU。3V, bandpass filter for extracting the co-harmonic of the current detected by JW 1. ltU, , ltV, &
W is an additional winding AU which takes as a signal input the =th harmonic current taken out by the bandpass filter 41U, DAV, and 4IW, generates a DC output according to the signal input, and is wound around the ℃ transformer iron core.
AV、4WK各々直流4流を流し帯域フィルタダU14
1V、41Wの出力が零になるようその出力を極性も含
めて調整する可変直流電源7U、7V、7Wは付加巻線
AU、AM、ANに誘起される交流電圧によつ℃可変直
リアクトルを示す。AV, 4WK each pass 4 DC currents, bandpass filter U14
The variable DC power supply 7U, 7V, 7W, which adjusts the output including the polarity so that the output of 1V, 41W becomes zero, uses a °C variable DC reactor by the AC voltage induced in the additional windings AU, AM, and AN. show.
tx第2次巻線は省略した事図予において変圧器鉄心l
に直流偏磁を生じていない状態では励磁電流iU、iV
、IWは電源周波数の奇数次の高調波しか含まないが、
直流偏&を生じると励磁電流の+側のピーク値と一側の
ピーク値の大きさか異るため偶数次の高調波を含む。こ
のために、励磁電流iU、iV。tx secondary winding is omitted in the diagram, transformer iron core l
When no DC bias is generated in the excitation current iU, iV
, IW includes only odd harmonics of the power supply frequency,
When a DC bias occurs, even-order harmonics are included because the peak value on the positive side and the peak value on the one side of the exciting current are different in magnitude. For this purpose, the excitation currents iU, iV.
1Wを変流器3U%JV、3wで検出して帯域フィルタ
4IU、ダv1ダWK通せば、帯域フィルタグU、ダ■
、ダWの出力には各々直流偏磁量に対応した出方信号が
得られる。可変直流電源&U、jV、jWはこの出力信
号を受けて同信号が零圧なるようKその出方を調整して
付加巻線6U、6V、4Wに直ηを電流を流す。付加巻
線6U%≦V%xWlcaれた直流電流によって変圧器
鉄心lに生じていた直流偏磁は零に規正される。If 1W is detected by current transformer 3U%JV, 3W and passed through bandpass filter 4IU, da v1 da WK, bandpass filters U, da■
, DAW output signals corresponding to the amount of DC biased magnetism are obtained. The variable DC power supplies &U, jV, and jW receive this output signal, adjust their output so that the signal becomes zero voltage, and flow a current η directly to the additional windings 6U, 6V, and 4W. The direct current bias generated in the transformer core l is regulated to zero by the direct current flowing through the additional winding 6U%≦V%xWlca.
このよう托して、この発明は所定の目的全多く達成1−
ることかできる。In this manner, the present invention achieves all of the stated objectives 1-
I can do that.
1図はこの発8Aを実施した3相変圧器を一部プ四ツク
図で示す回路図である。
lo・・変圧器鉄心、コU、 2V、JW・・・、7次
巻線、JU。
JV、JW・・・変流器、グU%ダV、ダW・・・帯域
フィルタ、jU、 tV、 SW ・・・可変直流電源
、4U、AV、aw・7付加巻線、7υ、7v、7W・
・・リアクトル。
代理人 葛 野 信 −FIG. 1 is a partial circuit diagram of a three-phase transformer that implements this 8A power generation. lo...Transformer core, U, 2V, JW..., 7th winding, JU. JV, JW...Current transformer, GU%DAV, DAW...Band filter, jU, tV, SW...Variable DC power supply, 4U, AV, aw/7 additional winding, 7υ, 7V , 7W・
...Reactor. Agent Shin Kuzuno −
Claims (1)
線を巻回し、前記1次巻線に変流器を設けると共忙この
変流器罠帯域フィルタを接続し、また前記付加巻線に直
流vL流を流すための可変直流電源を接続し、前記1次
巻線VC流れる励磁電流に含まれた電源周波数の一倍の
周波数成分の電流を前記変流器および前記帯域フィルタ
で検出し、前記電流が零になるように前記可変直流電源
の出力kt4整して前記付加巻線に前記直流電流を流す
こと全特徴とする変圧器の直流偏磁矯正方法。When a primary winding and an additional winding that does not conduct load current are wound around the transformer core, and a current transformer is provided on the primary winding, a bandpass filter is connected to the current transformer, and the additional winding is connected to a current transformer trap filter. A variable DC power source for flowing a DC vL current through the line is connected, and a current having a frequency component of one power supply frequency included in the excitation current flowing through the primary winding VC is detected by the current transformer and the bandpass filter. A method for correcting DC bias magnetism in a transformer, characterized in that the output kt4 of the variable DC power source is adjusted so that the current becomes zero, and the DC current is caused to flow through the additional winding.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12340482A JPS5913313A (en) | 1982-07-13 | 1982-07-13 | Correction of d.c. field distortion in transformer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12340482A JPS5913313A (en) | 1982-07-13 | 1982-07-13 | Correction of d.c. field distortion in transformer |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5913313A true JPS5913313A (en) | 1984-01-24 |
JPH0519805B2 JPH0519805B2 (en) | 1993-03-17 |
Family
ID=14859711
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12340482A Granted JPS5913313A (en) | 1982-07-13 | 1982-07-13 | Correction of d.c. field distortion in transformer |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5913313A (en) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008151661A1 (en) * | 2007-06-12 | 2008-12-18 | Siemens Transformers Austria Gmbh & Co Kg | Electrical transformer with unidirectional flux compensation |
JP2013532937A (en) * | 2010-07-20 | 2013-08-19 | エンプリマス、エルエルシー | Continuous non-stop AC grounding system for power system protection |
JP2013539336A (en) * | 2010-07-20 | 2013-10-17 | エンプリマス、エルエルシー | Detection system, detection method and self-test method |
JP2015029015A (en) * | 2013-07-30 | 2015-02-12 | 新電元工業株式会社 | Inductor device and power-supply unit |
CN105229759A (en) * | 2013-05-28 | 2016-01-06 | 西门子公司 | For reducing the equipment of the unidirectional flux component in the magnetic core of transformer |
US10931096B2 (en) | 2015-01-06 | 2021-02-23 | Techhold Llc | Systems and methods for actuating a transformer neutral blocking system |
US10985559B2 (en) | 2017-02-03 | 2021-04-20 | Techhold Llc | Method and system for improved operation of power grid components in the presence of direct current (DC) |
USRE48775E1 (en) | 2010-07-20 | 2021-10-12 | Techhold, Llc | Self-testing features of sensing and control electronics for a power grid protection system |
WO2021225750A1 (en) * | 2020-05-08 | 2021-11-11 | Raytheon Company | Actively-controlled power transformer and method for controlling |
US11451047B2 (en) | 2017-03-30 | 2022-09-20 | Techhold, Llc | Protection of electrical devices based on electromagnetic pulse signal |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5320525A (en) * | 1976-08-11 | 1978-02-24 | Hitachi Ltd | Compensating unit for dc field distortion of transformer |
JPS5542487A (en) * | 1978-09-21 | 1980-03-25 | Matsushita Electric Ind Co Ltd | Multiplex television signal generator |
-
1982
- 1982-07-13 JP JP12340482A patent/JPS5913313A/en active Granted
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5320525A (en) * | 1976-08-11 | 1978-02-24 | Hitachi Ltd | Compensating unit for dc field distortion of transformer |
JPS5542487A (en) * | 1978-09-21 | 1980-03-25 | Matsushita Electric Ind Co Ltd | Multiplex television signal generator |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008151661A1 (en) * | 2007-06-12 | 2008-12-18 | Siemens Transformers Austria Gmbh & Co Kg | Electrical transformer with unidirectional flux compensation |
US8314674B2 (en) | 2007-06-12 | 2012-11-20 | Siemens Ag Österreich | Electrical transformer with unidirectional flux compensation |
JP2013532937A (en) * | 2010-07-20 | 2013-08-19 | エンプリマス、エルエルシー | Continuous non-stop AC grounding system for power system protection |
JP2013539336A (en) * | 2010-07-20 | 2013-10-17 | エンプリマス、エルエルシー | Detection system, detection method and self-test method |
USRE48775E1 (en) | 2010-07-20 | 2021-10-12 | Techhold, Llc | Self-testing features of sensing and control electronics for a power grid protection system |
JP2016185071A (en) * | 2010-07-20 | 2016-10-20 | エンプリマス、エルエルシー | Continuous non-stop ac ground system for power system protection |
US20160125999A1 (en) * | 2013-05-28 | 2016-05-05 | Siemens Aktiengesellschaft | Apparatus for Reducing a Magnetic Unidirectional Flux Component in the Core of a Transformer |
CN105229759A (en) * | 2013-05-28 | 2016-01-06 | 西门子公司 | For reducing the equipment of the unidirectional flux component in the magnetic core of transformer |
US10083789B2 (en) | 2013-05-28 | 2018-09-25 | Siemens Aktiengesellschaft | Apparatus for reducing a magnetic unidirectional flux component in the core of a transformer |
JP2015029015A (en) * | 2013-07-30 | 2015-02-12 | 新電元工業株式会社 | Inductor device and power-supply unit |
US10931096B2 (en) | 2015-01-06 | 2021-02-23 | Techhold Llc | Systems and methods for actuating a transformer neutral blocking system |
US10985559B2 (en) | 2017-02-03 | 2021-04-20 | Techhold Llc | Method and system for improved operation of power grid components in the presence of direct current (DC) |
US11451047B2 (en) | 2017-03-30 | 2022-09-20 | Techhold, Llc | Protection of electrical devices based on electromagnetic pulse signal |
WO2021225750A1 (en) * | 2020-05-08 | 2021-11-11 | Raytheon Company | Actively-controlled power transformer and method for controlling |
US11418031B2 (en) * | 2020-05-08 | 2022-08-16 | Raytheon Company | Actively-controlled power transformer and method for controlling |
Also Published As
Publication number | Publication date |
---|---|
JPH0519805B2 (en) | 1993-03-17 |
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