JPH0318440B2 - - Google Patents
Info
- Publication number
- JPH0318440B2 JPH0318440B2 JP54063401A JP6340179A JPH0318440B2 JP H0318440 B2 JPH0318440 B2 JP H0318440B2 JP 54063401 A JP54063401 A JP 54063401A JP 6340179 A JP6340179 A JP 6340179A JP H0318440 B2 JPH0318440 B2 JP H0318440B2
- Authority
- JP
- Japan
- Prior art keywords
- field current
- generator
- allowable
- gas pressure
- overexcitation
- 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 - Lifetime
Links
- 239000000112 cooling gas Substances 0.000 claims description 17
- 238000001514 detection method Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims 1
- 230000002194 synthesizing effect Effects 0.000 claims 1
- 101150072119 Avr4 gene Proteins 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000035939 shock Effects 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
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)
Description
【発明の詳細な説明】
この発明は交流発電機が過励磁となつた場合、
これを検出すると共に、許容値以下になるように
制限し、制御する過励磁制限装置に関するもので
ある。[Detailed Description of the Invention] This invention provides a method for
This invention relates to an overexcitation limiting device that detects this and limits and controls the overexcitation so that it is below a permissible value.
従来この種の装置として第１図に示すものがあ
つた。図において１は交流発電機、２は交流発電
機の界磁コイル、３は計器用変圧器（以下PTと
記す）、４は自動電圧調整装置（以下AVRと記
す）、５は許容界磁電流設定器、６は分流器、７
は入力と出力が絶縁された絶縁増巾器、８は偏差
検出器、９は偏差増巾器である。 A conventional device of this type is shown in FIG. In the figure, 1 is the alternating current generator, 2 is the field coil of the alternator, 3 is the potential transformer (hereinafter referred to as PT), 4 is the automatic voltage regulator (hereinafter referred to as AVR), and 5 is the allowable field current. Setting device, 6 is a flow divider, 7
is an isolation amplifier whose input and output are isolated, 8 is a deviation detector, and 9 is a deviation amplifier.
次に従来のものゝ動作について説明する。発電
機電圧をPT３で検出し、AVR４で発電器電圧が
一定になるように界磁電流を増減して発電機電圧
を制御する。一方発電機の界磁コイルには発電機
の温度上昇との関連から最大電流が定められてお
りこの最大電流以下に制限する必要がある。この
ため第１図においては、許容界磁電流設定器５、
界磁電流を検出する分流器６、分流器６の出力を
絶縁してAVR４に与える絶縁増巾器７を設け、
許容界磁電流設定器５の出力信号と絶縁増巾器７
の出力の差をとる偏差検出器８で差を検出し
AVR４に設けられた信号混合器（図示せず）に
入力するのに適当な値に増巾器９で増巾して
AVR４に与えるようになされている。すなわち
AVR４は通常は発電機電圧が一定になるように
制御するが、界磁電流が許容値以上になる場合
に、許容値が越えないように制限して発電機を保
護するように動作する。 Next, the operation of the conventional method will be explained. PT3 detects the generator voltage, and AVR4 controls the generator voltage by increasing or decreasing the field current so that the generator voltage is constant. On the other hand, the maximum current for the field coil of the generator is determined in relation to the temperature rise of the generator, and it is necessary to limit the current to below this maximum current. Therefore, in FIG. 1, the allowable field current setting device 5,
A shunt 6 that detects the field current, and an insulation amplifier 7 that insulates the output of the shunt 6 and supplies it to the AVR 4 are provided.
Output signal of allowable field current setting device 5 and insulation amplifier 7
The difference is detected by the deviation detector 8 which takes the difference between the outputs of
Amplifier 9 amplifies the signal to a value suitable for input to a signal mixer (not shown) provided in AVR 4.
It is designed to be given to AVR4. i.e.
The AVR4 normally controls the generator voltage to be constant, but when the field current exceeds a permissible value, it operates to protect the generator by limiting it so that the permissible value is not exceeded.
しかるに一般に発電機の内部冷却ガス圧力に対
する許容界磁電流は、第２図に示すように内部冷
却ガス圧力の上昇に伴つて増大するが、従来の過
励磁制限装置では許容界磁電流値を一点しか設定
できないため、許容界磁電流は最悪の条件を想定
して実際には相当余裕のある値に設定される。こ
のため本来発電機が有する許容限界いつばいまで
使用できなかつた。またこのような許容界磁電流
値は連続通電することを条件に設定されており、
系統が事故を起して電圧が低下したときAVRは
増磁出力を出して系統の電圧を回復させねばなら
ないのにこの増磁出力を限定してしまうという欠
点があつた。 However, in general, the allowable field current for the internal cooling gas pressure of a generator increases as the internal cooling gas pressure increases, as shown in Figure 2, but conventional overexcitation limiting devices limit the allowable field current value to one point. Therefore, the allowable field current is actually set to a value with a considerable margin assuming the worst conditions. For this reason, the generator could not be used until it reached its permissible limit. In addition, such allowable field current values are set under the condition of continuous energization.
When an accident occurs in the grid and the voltage drops, the AVR must output a magnetizing output to restore the grid voltage, but the drawback is that the magnetizing output is limited.
すなわち発電機の過励磁は短時間であれば温度
が上昇するまでは問題ないし、事故になれば、母
線保護リレー等が動作して、一定時間後には事故
母線を切離して、系統の電圧は回復するので、系
統の事故時のような短時間時にも従来のように相
当余裕のある過励磁制限を常にかけておくことは
系統から考えた場合、系統の電圧制御特性を抹消
してしまう欠点があつた。 In other words, if the generator is overexcited for a short time, there will be no problem until the temperature rises, and if an accident occurs, the bus protection relay etc. will operate and after a certain period of time, the faulty bus will be disconnected and the voltage of the system will be restored. Therefore, from the perspective of the system, it is disadvantageous to always apply a conventional overexcitation limit with a considerable margin even during short periods of time such as during a system failure, as it erases the voltage control characteristics of the system. Ta.
この発明は上記のような従来のものゝ欠点を除
去するためになされたもので、許容界磁電流値を
発電機の内部冷却用ガス圧力に比例して変化でき
るようにし、発電機の限界いつぱいまで、使用で
きるようにすると共に、発電機電圧が通常運転範
囲より高くなつた場合は即刻過励磁制限をかけ、
発電機が正常で系統電圧が下がつたような場合に
は系統の電圧回復に寄与させるため、一定時間は
過励磁制限をかけずにフルフオーシングさせ一定
時間後にシヨツクを少なくするため１次遅れ回路
により、徐々に過励磁制限をかけることにより、
発電機の内部冷却ガス圧力が変化しても発電機の
限界いつぱいまで使用できると共に、系統の電圧
制御の安定度向上にも寄与できる過励磁制限装置
を提供することを目的としている。 This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and it makes it possible to change the allowable field current value in proportion to the internal cooling gas pressure of the generator, so as to avoid the limit of the generator. In addition, if the generator voltage becomes higher than the normal operating range, overexcitation is immediately restricted.
If the generator is normal and the grid voltage drops, in order to contribute to the recovery of the grid voltage, full focusing is performed without overexcitation restriction for a certain period of time, and after a certain period of time, a primary delay is applied to reduce shock. By gradually limiting overexcitation using a circuit,
It is an object of the present invention to provide an overexcitation limiting device that allows the generator to be used up to its maximum capacity even if the internal cooling gas pressure of the generator changes, and that also contributes to improving the stability of system voltage control.
以下、この発明の一実施例を図について説明す
る。第３図において１〜４、６〜８は第１図と同
様のもので１０は、発電機の内部冷却ガス圧力を
直流電圧に変換する変換器、１１は許容界磁電流
値のうち発電機の内部冷却ガス圧力に無関係なベ
ース量を設定するベース量設定器、１２は、発電
機の内部冷却ガス圧力に比例した第２図のような
許容界磁電流を作成する設定回路、１３は実界磁
電流が、許容界磁電流値を越したときこれを検出
する検出器、１４は限時動作、即時復帰タイマー
T1、１５はタイマーT1１４が一定時限後動作し
たとき開閉するリレーT1X、１６は限時動作退
時復帰タイマーT2、１７はタイマーT2が一定時
限後動作したとき開閉するリレーT2X、１８は
実界磁電流が許容値を越したとき動作するリレー
Ｙ、１９は入力抵抗、２０は演算増巾器、２１は
コンデンサ、２２はフイードバツク抵抗、２３は
交流電圧−直流電圧変換器、２４は比較器、２５
は発電機電圧が通常の運転範囲の上限より上で動
作するリレーHL、２６は発電機電圧の通常の運
転範囲の上限を設定する設定器である。 An embodiment of the present invention will be described below with reference to the drawings. In Fig. 3, 1 to 4 and 6 to 8 are the same as in Fig. 1, 10 is a converter that converts the internal cooling gas pressure of the generator into DC voltage, and 11 is a generator among the allowable field current values. 12 is a setting circuit for creating an allowable field current as shown in FIG. 2 proportional to the internal cooling gas pressure of the generator; 13 is an actual setting circuit; A detector that detects when the field current exceeds the allowable field current value, 14 is a time-limited operation, immediate return timer
T 1 , 15 is a relay T 1 X that opens and closes when timer T 1 14 operates after a certain period of time; 16 is a time-limited operation return timer T 2 ; 17 is a relay T that opens and closes when timer T 2 operates after a certain period of time 2 24 is a comparator, 25
2 is a relay HL that operates when the generator voltage is above the upper limit of the normal operating range, and 26 is a setting device that sets the upper limit of the normal operating range of the generator voltage.
次にこの発明の動作について説明する。第４図
に示すように発電機内部冷却ガス圧力に無関係な
ベース量Vbの設定を第３図のベース量設定器１
１で設定し、これに変換器１０で検出した発電機
の内部冷却ガス圧力に比例する電圧Vgを加えて、
第４図に示すような設定電圧をつくり、これを第
２図の許容値に合わせるように設定する。 Next, the operation of this invention will be explained. As shown in Fig. 4, the base quantity setting device 1 in Fig.
1, and by adding a voltage Vg proportional to the internal cooling gas pressure of the generator detected by the converter 10,
A set voltage as shown in FIG. 4 is created and set to match the tolerance value shown in FIG. 2.
次に発電機電圧が通常運転範囲であるかどうか
を検出リレーHL２５で検出する。通常運転範囲
とは発電機定格電圧のプラス５％〜マイナス５％
の間にあることを普通意味し、検出リレーHL２
５はその動作点を設定器２６でこまかく設定で
き、例えばプラス５％以上にて動作することを目
標として設定される。 Next, detection relay HL25 detects whether the generator voltage is within the normal operating range. The normal operating range is plus 5% to minus 5% of the generator rated voltage.
Normally means between detection relay HL2
5, its operating point can be precisely set using the setting device 26, and is set, for example, with the goal of operating at +5% or more.
発電機電圧が＋５％以上で、界磁電流が許容値
以上ならば比較器２４の出力によりリレーHL２
５が付勢されその接点HLa２５ａが閉となり、
接点HLb２５ｂが開となるので、演算増巾器２
０を介して偏差検出器８の出力が過励磁制限信号
として即時AVR４に与えられ、界磁電流を制限
するように動作する。 If the generator voltage is +5% or more and the field current is more than the allowable value, relay HL2 is activated by the output of comparator 24.
5 is energized and its contact HLa25a is closed,
Since contact HLb25b is open, operational amplifier 2
0, the output of the deviation detector 8 is immediately given to the AVR 4 as an overexcitation limit signal, and operates to limit the field current.
次に発電機電圧が通常運転範囲で系統電圧が低
下した場合、フルフオーシングして界磁電流が許
容値を越えるが、このとき発電機電圧を検出する
リレーHL２５は不動作であり、先ず検出器１３
が界磁電流が過大になつたことを検出する。これ
によりタイマーT1１４が付勢されるが、タイマ
ーT1１４は数秒から数十秒の発電機が耐えうる
時間に設定されており、この設定された時間後に
タイマーT1１４の接点T1X１５ａが閉となると、
この時点から抵抗２２とコンデンサ２１で形成さ
れた一次遅れ回路を通して過励磁制限信号が
AVR４に与えられる。一次遅れ回路を通す理由
はAVR４にシヨツクを与えないようにするため
である。 Next, when the generator voltage is in the normal operating range and the grid voltage drops, full focusing will occur and the field current will exceed the allowable value, but at this time relay HL25, which detects the generator voltage, is inactive, and the first step is to detect it. Vessel 13
detects that the field current has become excessive. This activates the timer T 1 14, but the timer T 1 14 is set to a time that the generator can withstand, from several seconds to several tens of seconds, and after this set time, the contact T 1 of the timer T 1 14 is activated. When X15a is closed,
From this point on, the overexcitation limit signal is transmitted through the first-order delay circuit formed by the resistor 22 and capacitor 21.
Given to AVR4. The reason for passing the signal through the first-order delay circuit is to avoid giving a shock to the AVR4.
タイマーT2１６はタイマーT1１４よりさらに
後で動作するもので抵抗２２とコンデンサ２１で
決まる時定数の２〜３倍の時限を有し、過励磁制
限信号がほゞ最終値に近ずいた時点で動作する。 Timer T 2 16 operates even later than timer T 1 14, and has a time limit that is two to three times the time constant determined by resistor 22 and capacitor 21, and the overexcitation limit signal approaches its final value. Works at the moment.
タイマーT2の接点T2X１７ｂが動作するとコ
ンデンサ２１が切離されるため一次遅れ回路が切
離され、演算増巾器２０は比例増巾器となり、界
磁電流が許容値以下になるまで偏差検出器８の出
力に比例した過励磁制限信号をAVR４に与える。
上記タイマーT2１６は界磁電流が許容値付近ま
で減少しても一次遅れ回路があると時間遅れが発
生するため、シヨツクがないぐらいに制限信号が
近ずいた時点で一次遅れ回路を切離して過励磁制
限信号の時間遅れを無くするためのものである。
またリレーＹ１８は動作表示とか、タイマーの時
限測定などに使用される。 When the timer T 2 contact T 2 An overexcitation limit signal proportional to the output of the device 8 is given to the AVR 4.
In the timer T2 16, even if the field current decreases to around the allowable value, a time delay will occur if there is a first-order lag circuit, so the first-order lag circuit is disconnected when the limit signal is close enough that there is no shock. This is to eliminate the time delay of the overexcitation limit signal.
Relay Y18 is also used for operation display, timer measurement, etc.
なお、上記実施例では、タイマーT2１６を使
用しているが、これを省略しても少し時間遅れが
あるだけで大略同様の効果を奏する。 In the above embodiment, the timer T 2 16 is used, but even if this is omitted, approximately the same effect can be achieved with only a slight time delay.
また演算増巾器２０の代りに磁気増巾器等の他
の形式の増巾器を用い他の一次遅れ手段を採用し
ても同様の効果を奏することはもちろんである。 It goes without saying that the same effect can be obtained by using other types of amplifiers, such as a magnetic amplifier, in place of the operational amplifier 20, and by employing other primary delay means.
また第３図では励磁機のないものについて説明
したが、直流励磁機、ブラシレス励磁機を使用し
た場合にも同様の効果を奏する。 Furthermore, although FIG. 3 has been described for the case without an exciter, the same effect can be achieved even when a DC exciter or a brushless exciter is used.
以上のように、この発明によれば、許容界磁電
流を発電機の内部冷却ガス圧力に比例するように
すると共に、発電機電圧が通常運転範囲より高く
なつた場合には即刻過励磁制限をかけ、発電機が
正常で系統電圧が下がつた場合には一定時間後に
１次遅れ回路により徐々に過励磁制限をかけるよ
うにしたので、発電機を能力いつぱいまで使用で
き、系統の電圧制御の安定度向上にも発電機に与
えるシヨツクを小さくして寄与できる効果があ
る。 As described above, according to the present invention, the allowable field current is made proportional to the internal cooling gas pressure of the generator, and when the generator voltage becomes higher than the normal operating range, overexcitation is immediately limited. If the generator is normal and the grid voltage drops, the first-order delay circuit will gradually limit overexcitation after a certain period of time, so the generator can be used to its full capacity and grid voltage control This also has the effect of reducing the shock given to the generator, which contributes to improving the stability of the generator.
第１図は従来の過励磁制限装置の概略構成図、
第２図は発電機の内部冷却ガス圧力と許容界磁電
流の関係を示す説明図、第３図はこの発明の一実
施例を示す過励磁制限装置の概略構成図、第４図
はこの発明における許容界磁電流の設定方法を説
明するための図である。
１……発電機、２……発電機の界磁コイル、３
……PT、４……AVR、６……分流器、７……絶
縁増巾器、８……偏差検出器、１０……発電機の
内部冷却ガス圧力を電気信号に変換する変換器、
１１……ベース量設定器、１２……発電機の内部
冷却ガス圧力に比例した許容界磁電流の設定値を
得る回路、１３……界磁電流が発電機の内部冷却
ガス圧力に比例した許容値以上になつたことを検
出する検出器、１４，１６……限時動作、即時復
帰するタイマー、１５，１７…リレー、１９……
入力抵抗、２０……演算増巾器、２１，２２……
１次遅れ回路を形成するコンデンサ、抵抗、２４
……比較器。なお図中同一符号は同一または相当
部分を示す。
Figure 1 is a schematic configuration diagram of a conventional overexcitation limiting device.
Fig. 2 is an explanatory diagram showing the relationship between the internal cooling gas pressure of the generator and the allowable field current, Fig. 3 is a schematic configuration diagram of an overexcitation limiting device showing an embodiment of the present invention, and Fig. 4 is the present invention. FIG. 3 is a diagram for explaining a method of setting an allowable field current in the embodiment. 1... Generator, 2... Generator field coil, 3
... PT, 4 ... AVR, 6 ... shunt, 7 ... insulation amplifier, 8 ... deviation detector, 10 ... converter that converts the internal cooling gas pressure of the generator into an electrical signal,
11...Base amount setting device, 12...Circuit for obtaining a set value of allowable field current proportional to the generator's internal cooling gas pressure, 13...Allowable field current proportional to the generator's internal cooling gas pressure Detector that detects when the value exceeds the value, 14, 16... Time-limited operation, timer that returns immediately, 15, 17... Relay, 19...
Input resistance, 20... Arithmetic amplifier, 21, 22...
Capacitors and resistors forming the first-order lag circuit, 24
...Comparator. Note that the same reference numerals in the figures indicate the same or corresponding parts.
Claims (1)
圧調整装置で制御すると共に、界磁電流と予め設
定された許容界磁電流と比較し、両者の偏差を偏
差検出器により検出し、界磁電流が許容界磁電流
を越えた場合はその偏差に基づいて過励磁制限信
号を出力して界磁電流を制限するようにした発電
機の過励磁制限装置において、上記発電機の出力
電圧が通常運転範囲の上限以上のときにこれを比
較検出する比較検出部と、上記発電機の内部冷却
ガス圧力を電気信号に変換し、ガス圧に比例した
許容界磁電流値を得る許容界磁電流設定回路と、
上記界磁電流が上記許容界磁電流値以上のときこ
れを検出する検出器と、上記比較検出器が動作
し、かつ界磁電流が許容界磁電流を越えると、瞬
時過励磁制限信号を上記自動電圧調整装置に加え
る瞬時信号発生回路と、上記発電機の出力電圧が
通常運転範囲内で、かつ上記界磁電流が上記許容
界磁電流値以上となつたときには一定時限経過後
に動作するタイマと、このタイマ動作時に過励磁
制限信号を上記自動電圧調整装置を徐々に印加す
る一次遅れ回路とを備えたことを特徴とする発電
機の過励磁制限装置。 ２ 許容界磁電流設定回路は発電機の内部冷却ガ
ス圧力を電気信号に変換する変換器の出力と、上
記発電機の内部冷却ガス圧力に無関係なベース量
を設定するベース量設定器の出力とを合成して上
記内部冷却ガス圧力に比例した許容界磁電流を作
成する構成であることを特徴とする特許請求の範
囲第１項記載の発電機の過励磁制限装置。[Claims] 1. The field current is controlled by an automatic voltage regulator according to the output voltage of the generator, and the field current is compared with a preset allowable field current, and the deviation between the two is detected. In the overexcitation limiting device for a generator, which detects the field current by a device and limits the field current by outputting an overexcitation limiting signal based on the deviation when the field current exceeds the allowable field current, A comparison detection unit that compares and detects when the output voltage of the generator is above the upper limit of the normal operating range, and a comparison detection unit that converts the internal cooling gas pressure of the generator into an electrical signal and a permissible field current value proportional to the gas pressure. and an allowable field current setting circuit to obtain the
When the field current exceeds the allowable field current value, the detector that detects this and the comparison detector operate, and when the field current exceeds the allowable field current, the instantaneous overexcitation limit signal is activated. an instantaneous signal generation circuit added to the automatic voltage regulator; and a timer that operates after a certain period of time when the output voltage of the generator is within the normal operating range and the field current exceeds the allowable field current value. An overexcitation limiting device for a generator, comprising: a first-order delay circuit that gradually applies an overexcitation limiting signal to the automatic voltage regulator when the timer operates. 2. The allowable field current setting circuit includes the output of a converter that converts the internal cooling gas pressure of the generator into an electrical signal, and the output of a base amount setting device that sets a base amount that is unrelated to the internal cooling gas pressure of the generator. 2. The overexcitation limiting device for a generator according to claim 1, wherein the overexcitation limiting device for a generator is configured to create an allowable field current proportional to the internal cooling gas pressure by synthesizing the internal cooling gas pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6340179A JPS55155598A (en) | 1979-05-21 | 1979-05-21 | Overexcitation restricting device for generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6340179A JPS55155598A (en) | 1979-05-21 | 1979-05-21 | Overexcitation restricting device for generator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55155598A JPS55155598A (en) | 1980-12-03 |
| JPH0318440B2 true JPH0318440B2 (en) | 1991-03-12 |
Family
ID=13228240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6340179A Granted JPS55155598A (en) | 1979-05-21 | 1979-05-21 | Overexcitation restricting device for generator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55155598A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5111117A (en) * | 1974-07-18 | 1976-01-29 | Tokyo Shibaura Electric Co | Dokihatsudenkino seigyosochi |
| JPS5373314A (en) * | 1976-12-10 | 1978-06-29 | Mitsubishi Electric Corp | Excessive excitation limitting device |
-
1979
- 1979-05-21 JP JP6340179A patent/JPS55155598A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5111117A (en) * | 1974-07-18 | 1976-01-29 | Tokyo Shibaura Electric Co | Dokihatsudenkino seigyosochi |
| JPS5373314A (en) * | 1976-12-10 | 1978-06-29 | Mitsubishi Electric Corp | Excessive excitation limitting device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55155598A (en) | 1980-12-03 |
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