JPH036755B2 - - Google Patents
Info
- Publication number
- JPH036755B2 JPH036755B2 JP54063400A JP6340079A JPH036755B2 JP H036755 B2 JPH036755 B2 JP H036755B2 JP 54063400 A JP54063400 A JP 54063400A JP 6340079 A JP6340079 A JP 6340079A JP H036755 B2 JPH036755 B2 JP H036755B2
- Authority
- JP
- Japan
- Prior art keywords
- field current
- generator
- signal
- gas pressure
- setting
- 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
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)
- Protection Of Generators And Motors (AREA)
- Control Of Eletrric Generators (AREA)
Description
【発明の詳細な説明】
この発明は、発電機の界磁電流を検出して、過
励磁の設定値と比較して警報及び制限を行う過励
磁保護装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an overexcitation protection device that detects the field current of a generator, compares it with an overexcitation setting value, and issues an alarm and a restriction.
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は設定器、２は発電機の界
磁電流を検出する分流器、３は界磁電流に比例し
た信号、４は比較器、５は比較器からの出力信
号、６はタイマー、７はタイマーからの警告信
号、８はタイマーからの制御信号、９は自動電圧
調整器（AVR）、１０は発電機の界磁コイル、１
１は発電機を示す。 A conventional device of this type is shown in FIG. In the figure, 1 is a setting device, 2 is a shunt that detects the field current of the generator, 3 is a signal proportional to the field current, 4 is a comparator, 5 is an output signal from the comparator, 6 is a timer, 7 is a warning signal from the timer, 8 is a control signal from the timer, 9 is an automatic voltage regulator (AVR), 10 is a field coil of the generator, 1
1 indicates a generator.
第１図に示す発電機の過励磁保護装置の動作に
ついて説明する。先ず、設定器１によつて定格時
における冷却用ガスのガス圧力に対応する許容界
磁電流に相当する値（以下許容値と称す）に設定
しておく。いま仮に界磁電流が増加して分流器２
からの直流信号が許容値を越えた状態が、タイマ
ー６で設定した所定時間以上持続した時、発電機
１１の過励磁警報信号を出す。また比較器４を増
幅器と置換えて、一定の時限後に制御信号８を自
動電圧調整器９に加えることによつて、励磁量を
減らし、界磁コイルが焼損するのを防ぐ働きをす
る。 The operation of the generator overexcitation protection device shown in FIG. 1 will be explained. First, the setting device 1 is set to a value (hereinafter referred to as an allowable value) corresponding to the allowable field current corresponding to the gas pressure of the cooling gas at the rated time. Now, if the field current increases and the shunt 2
When a state in which the DC signal from the generator exceeds a permissible value continues for a predetermined time set by the timer 6, an overexcitation alarm signal for the generator 11 is issued. Also, by replacing the comparator 4 with an amplifier and applying the control signal 8 to the automatic voltage regulator 9 after a certain time period, the amount of excitation is reduced and the field coil is prevented from being burnt out.
第２図は、発電機１１の内部冷却用ガスのガス
圧と許容界磁電流との関係を示すもので、横軸に
許容界磁電流、縦軸に冷却用ガスのガス圧を示
す。第２図の示すとおり、許容界磁電流は冷却用
ガスのガス圧により変化するにもかかわらず、従
来の過励磁保護装置では、許容値は一定であるた
め発電機１１を許容限界いつぱいまでの発電機能
力をフルに使用できないことがあり、また系統が
事故を起して電圧が低下したとき、自動電圧調整
器９は界磁電流を大きくして、系統の電圧を回復
させねばならないのにこの界磁電流をある大きさ
で限定してしまう欠点があつた。 FIG. 2 shows the relationship between the gas pressure of the internal cooling gas of the generator 11 and the allowable field current, with the horizontal axis showing the allowable field current and the vertical axis showing the gas pressure of the cooling gas. As shown in Fig. 2, although the allowable field current varies depending on the gas pressure of the cooling gas, with the conventional overexcitation protection device, the allowable value is constant, so the generator 11 is operated up to the allowable limit. In some cases, the power generating capacity of the system cannot be used to its full potential, and when the voltage drops due to an accident in the grid, the automatic voltage regulator 9 must increase the field current to restore the grid voltage. However, there was a drawback that this field current was limited to a certain value.
この発明は上記のような従来のものの欠点を除
去するためになされたもので、発電機の内部冷却
用ガスのガス圧力に比例して許容値を変化させる
ことにより、発電機を限界いつぱいまで使用でき
るようにすると共に、過励磁制限を常にかけずに
一定時限後にかけることにより、系統の電圧の回
復に寄与できる過励磁保護装置を提供することを
目的としている。 This invention was made to eliminate the drawbacks of the conventional ones as described above, and by changing the allowable value in proportion to the gas pressure of the internal cooling gas of the generator, it is possible to operate the generator to its maximum capacity. It is an object of the present invention to provide an overexcitation protection device that can be used, and can contribute to recovery of the voltage of the system by not always applying overexcitation limitation but only after a certain period of time.
以下この発明について説明する。第３図はこの
発明の基本構成を示すもので、第１図に冷却用ガ
スのガス圧に比例した直流信号１ａを発生する信
号発生器（図示せず）を追加したものである。こ
の直流信号１ａにより設定器１の許容値を発電機
の内部冷却用ガス圧力に比例して変化させようと
するものである。 This invention will be explained below. FIG. 3 shows the basic configuration of the present invention, in which a signal generator (not shown) is added to FIG. 1 to generate a DC signal 1a proportional to the gas pressure of the cooling gas. The DC signal 1a is used to change the allowable value of the setting device 1 in proportion to the internal cooling gas pressure of the generator.
この発明の理解を容易にするために一例をあげ
て具体的に説明する。第４図はこの発明の要部回
路の一例を示すものである。 In order to facilitate understanding of the present invention, an example will be given and a specific explanation will be given. FIG. 4 shows an example of the main circuit of the present invention.
直流信号１ａは冷却用ガスのガス圧に比例した
直流信号で、ガス圧が定格で０、ガス圧が低下す
るに従い負の値が大きくなるような直流信号であ
る。直流信号３は界磁電流に比例し、電流が０の
時０で、電流が増加するに従い負の値が大きくな
るような直流信号である。 The DC signal 1a is a DC signal that is proportional to the gas pressure of the cooling gas, and has a rated gas pressure of 0 and a negative value that increases as the gas pressure decreases. The DC signal 3 is a DC signal that is proportional to the field current, is 0 when the current is 0, and becomes larger in negative value as the current increases.
１２は設定器、１３は設定器からの出力で正の
値、１４は比較器、１５はタイマー、１６はトラ
ンジスター、１７はリレーを示す。 12 is a setting device, 13 is a positive value output from the setting device, 14 is a comparator, 15 is a timer, 16 is a transistor, and 17 is a relay.
いま、仮に設定器１２の出力１３をＡ（Ｖ）に
設定したとすると、冷却用ガスのガス圧が定格時
には、界磁電流に比例した直流信号３がＡ（Ｖ）
に相当する値になつた時、比較器１４の出力が負
から正に反転し、タイマー１５で設定した時間以
上継続した場合、その出力にによりトランジスタ
が導通し、リレー１７が動作する。このリレー１
７の接点を警報のために使用する。 Now, if the output 13 of the setting device 12 is set to A (V), when the gas pressure of the cooling gas is rated, the DC signal 3 proportional to the field current will be A (V).
When the value corresponding to is reached, the output of the comparator 14 is inverted from negative to positive, and if it continues for more than the time set by the timer 15, the transistor is made conductive by the output and the relay 17 is operated. This relay 1
7 contacts are used for alarm.
次に冷却用ガスのガス圧が低下し直流信号１ａ
が−Ｂ（Ｖ）になつたとすると、この時は入力３
が−（Ａ−Ｂ）（Ｖ）相当する値になつた時、比較
器１４の出力が反転し、一定時限後にリレー１７
が動作する。従つて−Ｂ（Ｖ）に相当する界磁電
流分だけ早く警報を発生させることができる。 Next, the gas pressure of the cooling gas decreases and the DC signal 1a
If it becomes -B (V), then input 3
When becomes a value corresponding to -(A-B)(V), the output of comparator 14 is inverted, and after a certain period of time, relay 17 is activated.
works. Therefore, an alarm can be generated earlier by the field current corresponding to -B (V).
次に比較器１４を増幅器１８とおき換え、制限
装置として使用する場合の例を第５図に示す。前
述の比較器１４を使用した場合と同様設定器１２
の出力１３をＡ（Ｖ）に設定したとすると、冷却
用ガスのガス圧が定格時には入力信号３がＡ（Ｖ）
に相当する値より大きくなつた時、増幅器１８の
出力１９は負から正に反転する。この状態がタイ
マー１５で設定した時間以上継続した場合、タイ
マーの出力である制限信号８はOVから正の信号
に変化する。この制限信号８を自動電圧調整装置
９に加えることにより界磁電流を制限することが
できる。また、冷却用ガスのガス圧が低下し、入
力１ａが−Ｂ（Ｖ）になつた場合も同様入力３が
−（Ａ−Ｂ）ｖに相当する界磁電流より大きくな
つた時一定時限後に制限信号８は正の信号とな
り、−Ｂ（ｖ）に相当する界磁電流分だけ低い値に
制限することができる。 Next, FIG. 5 shows an example in which the comparator 14 is replaced with an amplifier 18 and used as a limiting device. The setting device 12 is the same as when using the above-mentioned comparator 14.
If the output 13 of is set to A (V), the input signal 3 will be A (V) when the gas pressure of the cooling gas is rated.
, the output 19 of the amplifier 18 inverts from negative to positive. If this state continues for more than the time set by the timer 15, the limit signal 8, which is the output of the timer, changes from OV to a positive signal. By applying this limiting signal 8 to the automatic voltage regulator 9, the field current can be limited. Similarly, when the gas pressure of the cooling gas decreases and input 1a becomes -B (V), the same applies after a certain period of time when input 3 becomes larger than the field current corresponding to -(A-B)v. The limit signal 8 becomes a positive signal, and can be limited to a value as low as the field current corresponding to -B(v).
なお第１図、第８図ではサイリスタ励磁装置の
ブロツク図で説明してきたが、ブラシレス励磁
機、直流励磁機を使用した励磁装置についても適
用できる。 Although the block diagrams of thyristor excitation devices have been explained in FIGS. 1 and 8, the present invention can also be applied to excitation devices using brushless exciters or DC exciters.
このように本発明による発電機の過励磁保護装
置は、発電機の内部冷却用ガスのガス圧の変化に
比例して界磁電流の許容値を変化させると共に、
許容値を越えても、一定時限が経過するまでは、
制限信号を発生しないようにしたので、常に発電
機能力をフルに発揮でき、また系統事故により、
一時的に許容値を越える界磁電流が必要な場合に
は、許容値を越える界磁電流を供給できる理想的
な過励磁保護装置が得られる。 As described above, the overexcitation protection device for a generator according to the present invention changes the permissible value of the field current in proportion to the change in the gas pressure of the internal cooling gas of the generator, and
Even if the allowable value is exceeded, until a certain period of time has elapsed,
Since the limit signal is not generated, the generation function can always be fully utilized, and in the event of a system failure,
If a field current that exceeds the permissible value is temporarily required, an ideal overexcitation protection device can be obtained that can supply a field current that exceeds the permissible value.
第１図は従来の過励磁保護装置の一例を示す概
略構成図、第２図は発電機の許容界磁電流と内部
冷却用ガスのガス圧との関係を示す図、第３図は
この発明の基本構成を示す概略構成図、第４図、
及び第５図はこの発明の要部回路の一例を示す回
路図である。
１……設定器、１ａ……冷却用ガスのガス圧に
比例した直流信号、２……界磁電流を検出する分
流器、３……界磁電流に比例した直流信号、４…
…比較器、５……比較器の出力信号、６……タイ
マー、７……警報信号、８……制御信号、９……
自動電圧調整器、１０……界磁コイル、１１……
発電機、１２……設定器、１３……設定器の出力
信号、１４……比較器、１５……タイマー、１６
……トランジスタ、１７……リレー。なお図中同
一符号は同一または相当部分を示す。
Fig. 1 is a schematic configuration diagram showing an example of a conventional overexcitation protection device, Fig. 2 is a diagram showing the relationship between the allowable field current of the generator and the gas pressure of the internal cooling gas, and Fig. 3 is a diagram showing the present invention. Fig. 4 is a schematic configuration diagram showing the basic configuration of
and FIG. 5 are circuit diagrams showing an example of essential circuits of the present invention. DESCRIPTION OF SYMBOLS 1... Setting device, 1a... DC signal proportional to the gas pressure of the cooling gas, 2... Shunt device for detecting field current, 3... DC signal proportional to field current, 4...
... Comparator, 5 ... Comparator output signal, 6 ... Timer, 7 ... Alarm signal, 8 ... Control signal, 9 ...
Automatic voltage regulator, 10... Field coil, 11...
Generator, 12... Setting device, 13... Output signal of setting device, 14... Comparator, 15... Timer, 16
...transistor, 17...relay. Note that the same reference numerals in the figures indicate the same or corresponding parts.
Claims (1)
圧調整器で制御して過励磁保護を行うようにした
発電機の過励磁保護装置において、上記発電機の
内部冷却用ガス圧力を検出する検出手段と、界磁
電流の許容値を設定する設定器と、この設定器の
設定する許容値と上記検出手段の検出信号と発電
機の実界磁電流に比例した信号とを入力し、設定
器の許容値を検出手段の検出信号に比例して変化
させた許容値を実界磁電流に比例した信号が越し
た場合にこれらの偏差に比例した直流信号を発生
する増幅器と、この増幅器の出力を一定時限後に
上記自動電圧調整器に加えて界磁電流を制限させ
しめるタイマーを備えたことを特徴とする発電機
の過励磁保護装置。1. In a generator overexcitation protection device that performs overexcitation protection by controlling the field current with an automatic voltage regulator according to the output voltage of the generator, the internal cooling gas pressure of the generator is detected. A detection means, a setting device for setting the permissible value of the field current, the permissible value set by this setting device, the detection signal of the above-mentioned detection means, and a signal proportional to the actual field current of the generator are input, and the setting is made. an amplifier that generates a DC signal proportional to these deviations when a signal proportional to the actual field current exceeds a tolerance value obtained by changing the tolerance value of the device in proportion to the detection signal of the detection means; An overexcitation protection device for a generator, characterized in that it is equipped with a timer that limits the field current in addition to the automatic voltage regulator described above after the output has elapsed for a certain period of time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6340079A JPS55155597A (en) | 1979-05-21 | 1979-05-21 | Overexcitation protective device for generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6340079A JPS55155597A (en) | 1979-05-21 | 1979-05-21 | Overexcitation protective device for generator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55155597A JPS55155597A (en) | 1980-12-03 |
| JPH036755B2 true JPH036755B2 (en) | 1991-01-30 |
Family
ID=13228209
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6340079A Granted JPS55155597A (en) | 1979-05-21 | 1979-05-21 | Overexcitation protective device for generator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55155597A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201607193A (en) * | 2014-08-14 | 2016-02-16 | 菲利浦莫里斯製品股份有限公司 | Rechargeable device with short circuit prevention |
| JP6109976B1 (en) * | 2016-01-29 | 2017-04-05 | オーハツ株式会社 | Automatic voltage regulator |
| JP1574338S (en) * | 2016-07-15 | 2017-04-17 |
Family Cites Families (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 JP6340079A patent/JPS55155597A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55155597A (en) | 1980-12-03 |
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