JPS6126425A - Device for protecting transformer - Google Patents
Device for protecting transformerInfo
- Publication number
- JPS6126425A JPS6126425A JP14557684A JP14557684A JPS6126425A JP S6126425 A JPS6126425 A JP S6126425A JP 14557684 A JP14557684 A JP 14557684A JP 14557684 A JP14557684 A JP 14557684A JP S6126425 A JPS6126425 A JP S6126425A
- Authority
- JP
- Japan
- Prior art keywords
- transformer
- current
- section
- primary
- calculation
- 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
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Protection Of Transformers (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】 産業上の利用分野 本発明は変圧器の保護装置に関する。[Detailed description of the invention] Industrial applications The present invention relates to a protection device for a transformer.
従来の技術
一般に変圧器の２次出力側にサイリスタ装置、例えばサ
イリスタを制御要素とする順変換器等が接続され℃いる
一装置において、サイリスタの点弧角がアンバランスと
なった場合変圧器には直流成分を含んだ電流が２次電流
として流れてしまう。2. Description of the Related Art Generally, in a device in which a thyristor device, such as a forward converter using a thyristor as a control element, is connected to the secondary output side of a transformer, if the firing angle of the thyristor becomes unbalanced, the transformer In this case, a current containing a DC component flows as a secondary current.
発明が解決しようとする問題点
上記のように直流成分を含んだ電流が変圧器に流れると
、変圧器巻線に磁界の偏磁が起り、変圧器鉄心脚の一部
に磁気飽和が発生する。この結果励磁電流が局部的に増
加して鉄心脚及び巻線の一部が局部過熱し、これによっ
て変圧器が損傷してしまう。Problems to be Solved by the Invention When a current containing a DC component flows through a transformer as described above, a biased magnetic field occurs in the transformer windings, and magnetic saturation occurs in a part of the transformer core legs. . As a result, the exciting current increases locally, causing local overheating of the core legs and a portion of the windings, thereby damaging the transformer.
上記のような問題を解決するために従来は、変圧器鉄心
の断面積を増して磁気飽和を起りにくくする方法が講じ
られていた。しかしこの方法は通常の変圧器に比べて鉄
心量を増した余裕設計となり、製作費用が割高になる欠
点がある。特に大形圧延用サイリスタレオナードに用い
る変圧器は容量が大きいので、前記方法のように鉄心の
断面積を増すと膨大な製作費用が必要となる。In order to solve the above problems, conventional methods have been taken to increase the cross-sectional area of the transformer core to make magnetic saturation less likely to occur. However, this method requires a design with more iron core than a normal transformer, and has the disadvantage of being relatively expensive to manufacture. In particular, since the capacity of the transformer used in the large-sized rolling thyristor Leonard is large, increasing the cross-sectional area of the iron core as in the above method requires a huge amount of manufacturing cost.
また、サイリスタの点弧角のアンバランスヲ極力少なく
して変圧器の保護を行なう方法もあるが、サイリスク装
置側圧各種装置を増設しなければならず、それら増設費
用が著しく増大してしまう。There is also a method of protecting the transformer by minimizing the unbalance of the firing angle of the thyristor, but this requires the addition of various side pressure devices for the thyristor, which significantly increases the cost of such addition.
さらに差動継電器を用いて変圧器の異常を検出する方法
もあるが、励磁電流の増加を検出するには負荷電流に対
する比率が小さ過ぎて従来の継電器では確実な検出がで
きない等の欠点があった。Furthermore, there is a method of detecting transformer abnormalities using differential relays, but this method has the disadvantage that the ratio to the load current is too small to detect increases in excitation current, making it impossible to detect reliably with conventional relays. Ta.
本発明は上記の点に鑑みてなされたもので、変圧器の励
磁電流増加に起因する異常を確実に検出して変圧器を保
護することができるとともに、装置の低廉化を図った変
圧器の保護装置を提供することを目的としている。The present invention has been made in view of the above points, and it is possible to protect the transformer by reliably detecting abnormalities caused by an increase in the excitation current of the transformer, and also to reduce the cost of the device. It is intended to provide a protective device.
問題点を解決するための手段
本発明は、変圧器の１次側に電圧検出部および第１の電
流検出部を設けるとともに、２次側に第２の電流検出部
を設け、前記検出部の出力側には、変圧器の励磁電流を
算出する演算部を設けるとともに、誼演算部の出力と設
定値とを比較する比較部を設け、さらに前記比較部の出
力に基づいて変圧器の異常を判定する判定部とを設けた
ことを特徴としている。Means for Solving the Problems The present invention provides a voltage detecting section and a first current detecting section on the primary side of a transformer, and a second current detecting section on the secondary side. The output side is provided with a calculation section that calculates the excitation current of the transformer, and a comparison section that compares the output of the calculation section with a set value, and further detects an abnormality in the transformer based on the output of the comparison section. The present invention is characterized in that it is provided with a determination section that makes a determination.
作用
上記のように構成された装置において、演算部は、電圧
検出部、第１および第２電流検出部の検出信号に基づい
てＩｏ −Ｉｆ −ａＩ２（ただしＩｏは変圧器の励磁
電流、Ｉｆは変圧器の１次電流、１２は変圧器の２次電
流、ａは変圧器の１次巻線と２次巻線の巻数比）なるベ
クトル演算を行なって変圧器の励磁電流を算出する。演
算部の演算結果は比較部によって設定値、例えば正常時
の励磁電流値又は変圧器として許容できる限界値と比較
される。判定部は、比較部の比較出力によって変圧器の
励磁電流が増加したことを判定し、その場合は変圧器の
１次側に接続された遮断器をトリップさせたり、警報信
号を発したりする。Operation In the device configured as described above, the calculation unit calculates Io −If −aI2 (where Io is the excitation current of the transformer and If is The excitation current of the transformer is calculated by performing a vector operation where 12 is the primary current of the transformer, 12 is the secondary current of the transformer, and a is the turns ratio between the primary winding and the secondary winding of the transformer. The computation result of the computation section is compared with a set value, such as a normal excitation current value or a limit value allowable for the transformer, by a comparator. The determination unit determines that the excitation current of the transformer has increased based on the comparison output of the comparison unit, and in that case, trips a circuit breaker connected to the primary side of the transformer or issues an alarm signal.
実施例
以下、図面を参照しながら本発明の一実施例を説明する
。第１図において、変圧器１０１次側は遮断器２を介し
て図示しない交流電源に接続されているものとする。変
圧器１０２次側はサイリスタ装置３を介して図示しない
負荷に接続されているものとする。変圧器１と遮断器２
を結ぶ電路には第１の変流器４ａが介挿されており、変
圧器１とサイリスタ装置３を結ぶ電路には第２の変流器
４ｂが介挿されている。５は変圧器１０１次側電圧を検
出する計器用変圧器である。６ａ、６ｂ。EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings. In FIG. 1, it is assumed that the primary side of the transformer 10 is connected to an AC power source (not shown) via a circuit breaker 2. It is assumed that the secondary side of the transformer 10 is connected to a load (not shown) via the thyristor device 3. Transformer 1 and circuit breaker 2
A first current transformer 4a is inserted in the electrical path connecting the transformer 1 and the thyristor device 3, and a second current transformer 4b is inserted in the electrical path connecting the transformer 1 and the thyristor device 3. 5 is an instrument transformer that detects the voltage on the primary side of the transformer 10. 6a, 6b.
６Ｃは前記変流器４ａ、４ｂおよび計器用変圧器５から
各々入力されるアナログ信号をディジタル信号に変換す
るアナログ−ディジタル変換器である。前記変流器４ａ
とアナログ−ディジタル変換器６ａで第１の電流検出部
７を構成し、変流器４ｂとアナログ−ディジタル変換器
６ｂで第２の電流検出部８を構成し、計器用変圧器５と
アナログ−ディジタル変換器６ｃで電圧検出部９を構成
している。第１の電流検出部７がらは変圧器１０１次電
流１１が、第２の電流検出部８からは変圧器１タル信号
にて演算部１０に入力される。ここで変圧器１に流れる
１次電流１１（ベクトル）、２次電流Ｉ２ （ベクトル
）および励磁電流Ｉｏ （ベクトル）は第２図の等価回
路に示す如く流れる。この等価回路から次の関係式が成
立する。6C is an analog-digital converter that converts analog signals input from the current transformers 4a, 4b and the voltage transformer 5 into digital signals. The current transformer 4a
The current transformer 4b and the analog-to-digital converter 6b constitute a second current detection section 8, and the voltage transformer 5 and the analog-to-digital converter 6a constitute a first current detection section 7. The voltage detection section 9 is configured by the digital converter 6c. The first current detecting section 7 inputs the primary current 11 of the transformer 10, and the second current detecting section 8 inputs the transformer 1 primary current 11 to the calculating section 10 as a transformer 1 signal. Here, the primary current 11 (vector), secondary current I2 (vector) and exciting current Io (vector) flowing through the transformer 1 flow as shown in the equivalent circuit of FIG. From this equivalent circuit, the following relational expression is established.
（ただしａは変圧器の１次巻線と２次巻線の巻数比）
この（１）式より励磁電流ＩＯは、
ｊｏ ＝ Ｉｆ −ａＩｚ ・・・・・・・・・・・・
・・・・・曲曲（２）となる。(However, a is the turns ratio of the primary winding and secondary winding of the transformer.) From this formula (1), the exciting current IO is: jo = If -aIz ・・・・・・・・・・・・
...It becomes song (2).
演算部１０は、変圧器１の１次電流検出信号ＩＩ。The calculation unit 10 receives the primary current detection signal II of the transformer 1.
２次電流検出信号■２および１次電圧検出信号■１に基
づいて前記（２）式のベクトル演算を行なって励磁電流
ＩＯを求める。演算部１０の演算結果は比較部１１のつ
き合妬せ回路１２においてメ％！７１３の出力と比較さ
れる。このメモリ１３には予め設定された励磁電流値、
例えば正常時の励磁電流値又は変圧器として許容できる
限界値が記憶されている。つき合わせ回路１２の偏差出
力はアンプ１４で増幅された後、判定部１５に入力され
る。判定部１５はアンプ１４の出力信号に基づいて変圧
器１の励磁電流の大きさが正常か異常かを判定する。Based on the secondary current detection signal (2) and the primary voltage detection signal (2), the vector calculation of equation (2) is performed to determine the excitation current IO. The calculation result of the calculation unit 10 is processed by the matching circuit 12 of the comparison unit 11. 713 output. This memory 13 has preset excitation current values,
For example, a normal excitation current value or a limit value allowable as a transformer is stored. The deviation output of the matching circuit 12 is amplified by the amplifier 14 and then input to the determination section 15. The determination unit 15 determines whether the magnitude of the excitation current of the transformer 1 is normal or abnormal based on the output signal of the amplifier 14.
この判定部１５が変圧器１の異常を判定したときは、判
定部１５から遮断器２ヘトリップ信号が出力されて遮断
器２が遮断される。これによって変圧器１の入力電流は
遮断され、変圧器１は保護される。また、判定部１５が
変圧器ｌの異常を判定したときは、判定部１５から警報
が発せられるようにしても良い。When the determining section 15 determines that the transformer 1 is abnormal, the determining section 15 outputs a trip signal to the circuit breaker 2 and the circuit breaker 2 is shut off. This cuts off the input current to the transformer 1 and protects the transformer 1. Further, when the determination unit 15 determines that the transformer l is abnormal, the determination unit 15 may issue an alarm.
尚、比較部１１はつき合わせ回路１２を用いて構成する
に限らず他の比較回路を用いて構成しても良い。Note that the comparator 11 is not limited to the configuration using the matching circuit 12, but may be configured using other comparison circuits.
発明の効果
以上のように本発明によれば次のような効果が得られる
。すなわち、
（１）変圧器の励磁電流増加に起因する異常を確実に且
つ早期に検出することができる。この為変圧器の鉄心断
面積を増す必要が無くなり、変圧器の製作費の高騰を抑
制することができる。Effects of the Invention As described above, according to the present invention, the following effects can be obtained. That is, (1) Abnormalities caused by an increase in the excitation current of the transformer can be detected reliably and early. Therefore, there is no need to increase the cross-sectional area of the core of the transformer, and it is possible to suppress the rise in manufacturing costs of the transformer.
（２）変圧器の２次側にサイリスタ装置が接続されてい
る場合は、経年変化等の理由によってサイリスタの点弧
角がアンバランスになったことを早期に発見して変圧器
を保護することができる。(2) If a thyristor device is connected to the secondary side of the transformer, protect the transformer by early detecting that the firing angle of the thyristor has become unbalanced due to aging or other reasons. I can do it.
（３）演算部１０．比較部１１２判定部１５等はマイク
ロプロセッサを用いて処理することができるので、装置
の低廉化を図ることができる。(3) Arithmetic unit 10. Since the comparison section 112, determination section 15, etc. can be processed using a microprocessor, the cost of the apparatus can be reduced.
第１図は本発明の一実施例を示す回路図、第２図は変圧
器に流れる電流を説明するための等価回路図である。
１・・・変圧器、７・・・第１の電流検出部、８・・・
第２の電流検出部、９・・・電圧検出部１．１０・・・
演算部、１１・・・比較部、１５・・・判定部。FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is an equivalent circuit diagram for explaining the current flowing through a transformer. DESCRIPTION OF SYMBOLS 1... Transformer, 7... First current detection part, 8...
Second current detection section, 9... Voltage detection section 1.10...
Arithmetic unit, 11... Comparison unit, 15... Judgment unit.
Claims (1)
の１次電流を検出する第１の電流検出部と、前記変圧器
の２次電流を検出する第２の電流検出部と、前記電圧検
出部と前記第１および第２の電流検出部の検出信号に基
づいて前記変圧器の励磁電流を求める演算を行なう演算
部と、この演算部の演算結果と予め設定した電流値とを
比較する比較部と、この比較部の比較出力に基づいて前
記変圧器の異常を判定する判定部とを備えたことを特徴
とする変圧器の保護装置。a voltage detection section that detects a primary voltage of a transformer, a first current detection section that detects a primary current of the transformer, and a second current detection section that detects a secondary current of the transformer; a calculation unit that performs calculation to determine the excitation current of the transformer based on the detection signals of the voltage detection unit and the first and second current detection units, and a calculation result of the calculation unit and a preset current value. A protection device for a transformer, comprising: a comparing section for making a comparison; and a determining section for determining an abnormality in the transformer based on a comparison output of the comparing section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14557684A JPS6126425A (en) | 1984-07-13 | 1984-07-13 | Device for protecting transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14557684A JPS6126425A (en) | 1984-07-13 | 1984-07-13 | Device for protecting transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6126425A true JPS6126425A (en) | 1986-02-05 |
Family
ID=15388296
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14557684A Pending JPS6126425A (en) | 1984-07-13 | 1984-07-13 | Device for protecting transformer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6126425A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62268319A (en) * | 1986-05-14 | 1987-11-20 | 富士電機株式会社 | Proportional differential relay system |
| CN100405070C (en) * | 2003-09-03 | 2008-07-23 | 溥杰盛私人有限公司 | Running and loading detection method for converter |
| JP2012129527A (en) * | 2010-12-16 | 2012-07-05 | General Electric Co <Ge> | Method and system for monitoring transformer health |
| WO2019142574A1 (en) * | 2018-01-16 | 2019-07-25 | 日立Ｇｅニュークリア・エナジー株式会社 | Electric circuit failure detecting device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5716573A (en) * | 1980-05-23 | 1982-01-28 | Kraftwerk Union Ag | Rotor for generator with superconductive exciting coil |
-
1984
- 1984-07-13 JP JP14557684A patent/JPS6126425A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5716573A (en) * | 1980-05-23 | 1982-01-28 | Kraftwerk Union Ag | Rotor for generator with superconductive exciting coil |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62268319A (en) * | 1986-05-14 | 1987-11-20 | 富士電機株式会社 | Proportional differential relay system |
| CN100405070C (en) * | 2003-09-03 | 2008-07-23 | 溥杰盛私人有限公司 | Running and loading detection method for converter |
| JP2012129527A (en) * | 2010-12-16 | 2012-07-05 | General Electric Co <Ge> | Method and system for monitoring transformer health |
| WO2019142574A1 (en) * | 2018-01-16 | 2019-07-25 | 日立Ｇｅニュークリア・エナジー株式会社 | Electric circuit failure detecting device |
| JP2019124552A (en) * | 2018-01-16 | 2019-07-25 | 日立Ｇｅニュークリア・エナジー株式会社 | Electric path failure detection device |
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