JPS58218899A - Excess current limiter - Google Patents
Excess current limiterInfo
- Publication number
- JPS58218899A JPS58218899A JP57101414A JP10141482A JPS58218899A JP S58218899 A JPS58218899 A JP S58218899A JP 57101414 A JP57101414 A JP 57101414A JP 10141482 A JP10141482 A JP 10141482A JP S58218899 A JPS58218899 A JP S58218899A
- Authority
- JP
- Japan
- Prior art keywords
- current
- overcurrent
- synchronous machine
- circuit
- limiting
- 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
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/14—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は同期機の端子電圧を一定に制御する自動電圧調
整装置と組合わせて使用する過電流制限装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an overcurrent limiting device used in combination with an automatic voltage regulator that controls the terminal voltage of a synchronous machine to be constant.
同期機の端子電圧を一定に制御するために自動電圧調整
装置が使用されているが、同期機の端子電圧の変動に対
して自動電圧調整装置が制御できる範囲は、同期機の能
力曲線で表わされる電気的運転の許容限界によシ制限さ
れる。また、同期機が電力系統に並列して運転される場
合には更に定態安定限界等によっても制限される。一般
に同期機を自動電圧調整運転する場合は、これらを考慮
して自動電圧調整運転と励磁制限装置を組合わせて使用
している。−励磁制限装置には目的に応じて種々のもの
があるが、過電流制限装置は同期機の電機子電流を検出
し、過電流制限信号を前記自動電圧調整装置へ加えるも
のである。An automatic voltage regulator is used to control the terminal voltage of a synchronous machine to a constant level, but the range in which the automatic voltage regulator can control fluctuations in the terminal voltage of a synchronous machine is expressed by the capacity curve of the synchronous machine. limited by the permissible limits of electrical operation. Furthermore, when a synchronous machine is operated in parallel with the power system, it is further restricted by steady-state stability limits and the like. Generally, when operating a synchronous machine with automatic voltage adjustment, the automatic voltage adjustment operation and excitation limiting device are used in combination, taking these into consideration. - There are various excitation limiting devices depending on the purpose, but an overcurrent limiting device detects the armature current of a synchronous machine and applies an overcurrent limiting signal to the automatic voltage regulator.
第１図は過電流制御装置の従来例を示したもので、１は
同期機、２はその同期機１の界磁を制御し、同期機１の
端子電圧を一定に制御する自動電圧調整装置、３は過電
流制限装置である。過電流制限装置３の過電流検出器３
ａの入力は・電流変成器４を介して同期機１の電機子電
流を検出し、その電機子電流が過電流検出器３ａの過電
流設定値を超えると出力接点３ｂが閉路し、無効電流検
出回路３ｃの出力を自動電圧調整装置２へ加える。Figure 1 shows a conventional example of an overcurrent control device, where 1 is a synchronous machine, and 2 is an automatic voltage regulator that controls the field of the synchronous machine 1 and keeps the terminal voltage of the synchronous machine 1 constant. , 3 is an overcurrent limiting device. Overcurrent detector 3 of overcurrent limiting device 3
The input of a is to detect the armature current of the synchronous machine 1 via the current transformer 4, and when the armature current exceeds the overcurrent setting value of the overcurrent detector 3a, the output contact 3b is closed and the reactive current is The output of the detection circuit 3c is applied to the automatic voltage regulator 2.
無効電流検出回路３Ｃの入力は、電圧誉圧器５と■、電
流変成器を介してそれぞれ同期機１の電圧、電流を入力
し、無効電流を検出し、過電流検出器３ａの出力接点３
ｂを通して自動電圧調整装置２゛１へ加えられる。無効
電流検出回路３Ｃの出力には極性があシ、自動電圧調整
装置２に対して励磁弱めまたは励磁強めの制限信号を出
す。第２図に同１期発電機の能力曲線Ａに対する過電流
制限装置３による制限曲線を示す。第２図において、制
限曲線Ｂは遅れ無効電流に対する制限動作で自動電圧調
整装置２に対して励磁弱めの信号を出し、制限曲線Ｃは
進み無効電流に対する制限動作で自動電圧調整装置２に
対して励磁強めの信号を出す。そして、自動電圧調整装
置２の出力は励磁装置６へ加えられ、同期機１の界磁電
流を制御する。The inputs of the reactive current detection circuit 3C are the voltage and current of the synchronous machine 1 via the voltage transformer 5 and the current transformer, respectively, to detect the reactive current, and output the output contact 3 of the overcurrent detector 3a.
b to the automatic voltage regulator 2'1. The output of the reactive current detection circuit 3C has a different polarity and outputs a limit signal to the automatic voltage regulator 2 to weaken or strengthen excitation. FIG. 2 shows a limit curve by the overcurrent limiter 3 for the capacity curve A of the first-stage generator. In FIG. 2, limit curve B is a limiting operation for delayed reactive currents and outputs a weakening signal to the automatic voltage regulator 2, while limit curve C is a limiting operation for advancing reactive currents and outputs a weakening signal to the automatic voltage regulator 2. Outputs a signal with stronger excitation. The output of the automatic voltage regulator 2 is then applied to the excitation device 6 to control the field current of the synchronous machine 1.
ところで、この過電流制限装置３による自動電圧調整装
置２への励磁制限動作は瞬時に行なわれることになるが
、第３図に示すように同期機１の電機子電流の過電流制
量は反限時特性を持っている。一方、第２図に示すよう
に過電流制限装置３の制限曲線Ｃについては、同期機１
を系統へ併入した場合の定態安定限界りに対して不足励
磁による脱調を防ぐだめに瞬時に制限動作を行なう必要
がある。Incidentally, the excitation limiting operation of the automatic voltage regulator 2 by the overcurrent limiting device 3 is instantaneously performed, but as shown in FIG. 3, the overcurrent limiting of the armature current of the synchronous machine 1 is reversed. It has time-limited characteristics. On the other hand, as shown in FIG. 2, the limit curve C of the overcurrent limiter 3 is
In order to prevent step-out due to insufficient excitation, it is necessary to perform a limiting action instantaneously to the limit of steady-state stability when the motor is added to the system.
本発明は上記必要性に鑑みてなされたものであシ、過電
流制限装置により制限動作を行なう際、制限領域に応じ
てｉ４１！流制限動作を反限時後に行なう場合と、瞬時
に行なう場合とに切換えることによシ、過度の過電流制
限を行なわないようにした過電流制限装置を提供するこ
とを目的とする。The present invention has been made in view of the above-mentioned need.When performing a limiting operation using an overcurrent limiting device, i41! It is an object of the present invention to provide an overcurrent limiting device which prevents excessive overcurrent limiting by switching the current limiting operation between performing the current limiting operation after a counter-time limit and instantaneously performing the current limiting operation.
このため、本発明は過電流制限装置に無効電流 ”
：゛極性判別回路と反限時回路とを設け、例えば同期機
が同期発電機の場合、無効電力極性判別回路が進み力率
を検出した場合には、過電流検出回路出力を極性反転回
路を介して瞬時に自動電圧調整装置に与え、遅れ力率を
検出した場合には、過電流検出回路出力を反限時回路を
介して反限時後に自動電圧調整装置に与え、制限領域に
応じて過電流制限を行なうことによシ、過度の過蛾′流
制限を行なうことのないようにしたことを特徴とする。For this reason, the present invention provides an overcurrent limiting device with reactive current.
：゛A polarity discrimination circuit and an inverse time limit circuit are provided. For example, when the synchronous machine is a synchronous generator, when the reactive power polarity discrimination circuit advances and detects the power factor, the overcurrent detection circuit output is passed through the polarity inversion circuit. If a lagging power factor is detected, the output of the overcurrent detection circuit is sent to the automatic voltage regulator after the counter-time limit via the counter-time circuit, and the over-current is limited according to the restriction area. The present invention is characterized in that by doing so, excessive flow restriction is not performed.
以下、本発明を図の実施例を参照して説明する。 The present invention will be explained below with reference to the embodiments shown in the drawings.
第４図は本発明の一実施例に係わる過電流制限装置の構
成図を示したものである。図中、第１図と同一符号は同
−又は相当部分％に示し、更に、１３は本発明の過電流
制限装置で、１３ａは過電流検出回路、１３ｂは極性反
転増幅器、１３ｃは増幅回路、１３ｄは無効電流検出回
路、１３ａは無効電流極性判別回路、１３ｆは反限時回
路、１３ｇ 、１３ｈは無効電流極性判別回路１３ｅの
出力接点、１３１は反限時回路１３ 、ｆの出力接点で
ある。FIG. 4 shows a configuration diagram of an overcurrent limiting device according to an embodiment of the present invention. In the figure, the same reference numerals as in FIG. 1 indicate the same or corresponding percentages, and 13 is an overcurrent limiting device of the present invention, 13a is an overcurrent detection circuit, 13b is a polarity inversion amplifier, 13c is an amplifier circuit, 13d is a reactive current detection circuit, 13a is a reactive current polarity discrimination circuit, 13f is an inverse time limit circuit, 13g and 13h are output contacts of the reactive current polarity discrimination circuit 13e, and 131 is an output contact of the inverse time limit circuit 13, f.
本実施例の過電流制限装置はこのように構成されて、同
期機１の電機子電流を検出し、その電機子電流が過電流
検出回路１３ａの過電流設定値を超えると制限信号が出
力される。この制限信号が第２図の制限曲線Ｂによる場
合は、無効電流極性判別回路１３ｅの出力接点１３ｇと
反転時回路１３ｆの出力接点１３１が閉路し、上記制限
信号は増幅回路１３ｃを介して自動電圧調整装置２へ加
えられる。一方、過電流検出回路１３ａの制限・趣性反
転増幅器１３ｂと増幅回路１３ｃを介して自動電圧調整
装置２へ加えられる。The overcurrent limiting device of this embodiment is configured as described above, detects the armature current of the synchronous machine 1, and outputs a limiting signal when the armature current exceeds the overcurrent setting value of the overcurrent detection circuit 13a. Ru. When this limit signal is based on the limit curve B in FIG. added to the conditioning device 2. On the other hand, the current is applied to the automatic voltage regulator 2 via the limiting/inverting amplifier 13b and the amplifier circuit 13c of the overcurrent detection circuit 13a.
以上の構成によれば、過電流制限動作は、第２図の遅れ
側の制限曲線Ｂに対しては反限時後退電流制限を行なう
ため、同期機の電機子巻線へ耐量に応じて同期機の運転
範囲が拡大できる。一方、第２図の進み側の制限曲線Ｃ
に対しては、瞬時に過電流制限を行ない制限曲線Ｃ以下
に励磁を下げることがないため、同期機の定態安定限界
りの領域まで同期機の運転点が下がることなく安定に運
転が可能である。According to the above configuration, in the overcurrent limiting operation, in order to carry out inverse time limit backward current limiting for the limit curve B on the delay side in FIG. The operating range of the vehicle can be expanded. On the other hand, the limit curve C on the advancing side in Figure 2
, the overcurrent is instantaneously limited and the excitation is not lowered below the limit curve C, so stable operation is possible without the operating point of the synchronous machine falling to the area around the steady-state stability limit of the synchronous machine. It is.
尚、上記実施例において、反限時回路１３ｆを過電流制
限装置１３へ内蔵しているが、別装置として反限時継電
器と組合わせた構成としても良い。In the above embodiment, the inverse time limit circuit 13f is built into the overcurrent limiting device 13, but it may be combined with an inverse time relay as a separate device.
以上のように本発明によれば、過電゛流制限装置によシ
制限動作を行なう際、制限領域に応じて過電流制限動作
を反限時後に行なう場合と、瞬時に行なう場合とを切換
えるので、過度の過電流制限を行なわない過電流制限装
置が得られる。As described above, according to the present invention, when the overcurrent limiting device performs the overcurrent limiting operation, it is possible to switch between performing the overcurrent limiting operation after a counter-time limit and instantaneously depending on the limiting area. , an overcurrent limiting device that does not perform excessive overcurrent limiting can be obtained.
第１図は従来の過電流制限装置の構成図、第２図は同期
発電機の能力曲線と制限曲線図、第３図は同期機の電機
子巻線の過負荷耐量曲線図、第４図は本発明の一実施例
に係る過電流制限装置の構成図である。
１・・・同期機、２・・・自動電圧調整装置、３・・・
過電流制限装置、３ａ・・・過電流検出器、２３ｂ・・
・過電流検出器の出力接点、３Ｃ・・・無効電流検出回
路、４・・・電流変成器、５・・・電圧変成器、６・・
・励磁装置、１３・・・過電流制限装置、１３Ｂ・・・
過電流検出回路、１３ｂ・・・極性反転増幅器、１３ｅ
・・・増幅器、１３ｄ・・・無効電流検出回路、１３ｅ
・・・無効電流極性判別回路、１３ｆ・・・反限時回路
、１３ｇ 、１３ｈ・・・無効電流極性判別回路の出力
接点、１３１・・・反限時回路の出力接点。
（７３１７） 代理人 弁理士 則 近 憲 佑
（ほか１名）
、′１
第１図
第２図
第３図
第４図Figure 1 is a configuration diagram of a conventional overcurrent limiting device, Figure 2 is a diagram of the capacity curve and limit curve of a synchronous generator, Figure 3 is a diagram of the overload capacity curve of the armature winding of a synchronous machine, and Figure 4 is a diagram of the overload capacity curve of the armature winding of a synchronous machine. FIG. 1 is a configuration diagram of an overcurrent limiting device according to an embodiment of the present invention. 1...Synchronous machine, 2...Automatic voltage regulator, 3...
Overcurrent limiting device, 3a... Overcurrent detector, 23b...
・Output contact of overcurrent detector, 3C...Reactive current detection circuit, 4...Current transformer, 5...Voltage transformer, 6...
- Excitation device, 13... Overcurrent limiting device, 13B...
Overcurrent detection circuit, 13b... polarity inversion amplifier, 13e
...Amplifier, 13d...Reactive current detection circuit, 13e
... Reactive current polarity discrimination circuit, 13f... Inverse time limit circuit, 13g, 13h... Output contact of reactive current polarity discrimination circuit, 131... Output contact of inverse time limit circuit. (7317) Agent: Patent Attorney Noriyuki Chika (and 1 other person), '1 Figure 1 Figure 2 Figure 3 Figure 4
Claims (1)
が過電流となった場合に、前”ｉ己同期機の端子電圧を
一定に制御する自動電圧調整装置へ電流制限信号を印加
する過電流制限装置において、前記同期機の無効電流の
極性を判別する極性判別回路と、前記同期機に流れる過
電流を検出する過電流検出器の過電流検出出力を入力信
号とする反限時回路および極性反転回路とを備え、前記
極性判別回路の出力によシ前記極性反転回路の出力ある
いは前記反限時回路により遅延された前記過電流検出回
路の出力のいずれかを選択的に前記自動電圧調整装置に
印加することを特徴とする過電流・制限装置。Detects the armature current of the synchronous machine, and applies a current limit signal to an automatic voltage regulator that controls the terminal voltage of the synchronous machine to a constant level when the armature current of the synchronous machine becomes an overcurrent. In the overcurrent limiting device, the polarity determination circuit determines the polarity of the reactive current of the synchronous machine, and the inverse time limit circuit receives an overcurrent detection output of an overcurrent detector that detects the overcurrent flowing through the synchronous machine as an input signal. and a polarity reversal circuit, wherein the automatic voltage adjustment selectively selects either the output of the polarity reversal circuit or the output of the overcurrent detection circuit delayed by the inverse timing circuit according to the output of the polarity discrimination circuit. An overcurrent/limiting device characterized by applying an electric current to the device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57101414A JPS58218899A (en) | 1982-06-15 | 1982-06-15 | Excess current limiter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57101414A JPS58218899A (en) | 1982-06-15 | 1982-06-15 | Excess current limiter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58218899A true JPS58218899A (en) | 1983-12-20 |
Family
ID=14300043
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57101414A Pending JPS58218899A (en) | 1982-06-15 | 1982-06-15 | Excess current limiter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58218899A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62138100A (en) * | 1985-12-12 | 1987-06-20 | Meidensha Electric Mfg Co Ltd | Controller for excitation |
| US5013995A (en) * | 1989-10-30 | 1991-05-07 | Sundstrand Corporation | Programmable current limit curve |
| JP2008278571A (en) * | 2007-04-26 | 2008-11-13 | Toshiba Corp | Magnetic excitation control device of synchronous machine |
| JP2018007484A (en) * | 2016-07-06 | 2018-01-11 | 株式会社東芝 | Exciter and excitation method of synchronous machine |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53146110A (en) * | 1977-05-25 | 1978-12-19 | Fuji Electric Co Ltd | Automatic power factor regulator for pumping-up power plant |
| JPS5671496A (en) * | 1979-11-14 | 1981-06-15 | Mitsubishi Electric Corp | Excitation control device for rotary machine |
-
1982
- 1982-06-15 JP JP57101414A patent/JPS58218899A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53146110A (en) * | 1977-05-25 | 1978-12-19 | Fuji Electric Co Ltd | Automatic power factor regulator for pumping-up power plant |
| JPS5671496A (en) * | 1979-11-14 | 1981-06-15 | Mitsubishi Electric Corp | Excitation control device for rotary machine |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62138100A (en) * | 1985-12-12 | 1987-06-20 | Meidensha Electric Mfg Co Ltd | Controller for excitation |
| US5013995A (en) * | 1989-10-30 | 1991-05-07 | Sundstrand Corporation | Programmable current limit curve |
| JP2008278571A (en) * | 2007-04-26 | 2008-11-13 | Toshiba Corp | Magnetic excitation control device of synchronous machine |
| JP2018007484A (en) * | 2016-07-06 | 2018-01-11 | 株式会社東芝 | Exciter and excitation method of synchronous machine |
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