JPH01240775A - Speed control device for hydraulic turbine generator - Google Patents
Speed control device for hydraulic turbine generatorInfo
- Publication number
- JPH01240775A JPH01240775A JP63067329A JP6732988A JPH01240775A JP H01240775 A JPH01240775 A JP H01240775A JP 63067329 A JP63067329 A JP 63067329A JP 6732988 A JP6732988 A JP 6732988A JP H01240775 A JPH01240775 A JP H01240775A
- Authority
- JP
- Japan
- Prior art keywords
- load
- speed
- water turbine
- opening
- guide vane
- 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 230000004044 response Effects 0.000 claims abstract description 4
- 230000009471 action Effects 0.000 abstract description 6
- 230000002238 attenuated effect Effects 0.000 abstract description 2
- 230000010354 integration Effects 0.000 abstract 2
- 230000008859 change Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、水車発電機の速度制御装置に係り、特に発電
機を連結した水車のカイトベーンの開度を、水車の回転
速度が目標速度に一致するように、少なくともＰ動作要
素および■動作要素を含むディジタル型の調節器を介し
て制御する水車発電機の速度制御装置に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a speed control device for a water turbine generator, and in particular controls the opening degree of a kite vane of a water turbine connected to a generator so that the rotational speed of the water turbine reaches a target speed. Accordingly, the present invention relates to a speed control device for a water turbine generator controlled via a digital regulator including at least a P operating element and a (2) operating element.
水車発電機の能力試験の中に負荷遮断試験がある。この
負荷遮断試験は、所定量の負荷を遮断したときの水車発
電機（すなわち、主Ｒ）の回転速度Ｎや鉄管水圧Ｐ、発
電機電圧ｖなどの上昇値がそれぞれの保証値内に納まる
かどうかを判定するために行うものである。この試験に
より、主機の能力や制御状態を判定するのに欠かすこと
のできない重要なデータを得ることができる。特に主機
回転速度Ｎの変動ΔＮ（この場合は上昇値）を所定値内
に抑えることは重要なこととされている。Load shedding tests are part of the capacity tests for water turbine generators. This load shedding test checks whether the increased values of the rotational speed N of the water turbine generator (i.e. main R), iron pipe water pressure P, generator voltage V, etc. are within their respective guaranteed values when a predetermined amount of load is sheared off. This is done to determine whether the This test provides important data that is essential for determining the main engine's performance and control status. In particular, it is considered important to suppress the fluctuation ΔN (in this case, the increase value) in the main engine rotational speed N to within a predetermined value.
この速度変動ΔＮは水車ガイドベーンの閉頭特性、特に
閉鎖動作時の不動時間により大きく変わってくる。This speed fluctuation ΔN varies greatly depending on the head closing characteristics of the water turbine guide vane, especially the immobility time during the closing operation.
水車発電機の回転速度を負荷のいかんにかかわらず一定
に保つために用いられるのが調速機として知られる速度
制御装置である。この調速機は、水車発電機の回転速度
が目標速度に一致するように水車のガイドベーンの開度
を制御するものであって、第３図に従来装置の構成を示
す。A speed control device known as a speed governor is used to keep the rotational speed of a water turbine generator constant regardless of the load. This speed governor controls the opening degree of the guide vane of the water turbine so that the rotational speed of the water turbine generator matches the target speed, and FIG. 3 shows the configuration of a conventional device.
第３図においては水車２およびこれに連結された発電ｆ
ｉ４により水車発電機（すなわち主機）が構成されてい
る。発電機４の発生電力は遮断器６を介して図示してい
ない送電線に供給される０発電機４は交流発電機であっ
て、その出力周波数は主機の回転速度に比例する。主機
の回転速度Ｎは速度検出器１０によって検出され、周波
数設定器１１によって設定される基準周波数相当の目標
速度Ｎ′″と突き合わされる。この突き合わせによって
得られる基準速度偏差信号ΔＮｏ＝Ｎ” −Ｈに、負荷
補償のための負荷補償信号ΔＮ１を加え合わせてＰＩＤ
調節器１２に入力される速度偏差信号ΔＮが形成される
。負荷補ｒ！！＆信号ΔＮ１は、負荷設定器１３によっ
て設定される負荷相当の目標ベーン開度Ｍ＊と開度検出
器１４によって検出される水車２のベーン（図示せず）
の開度にとの間の偏差を表す信号を変化率制限回路】７
５、および負荷投入信号接点１６を通して得られる。ｐ
ｒＤｐ節器１２は周知のこと＜Ｐ（比例）動作要素、■
（積分）動作要素、およびＤ（微分）動作要素をそれぞ
れ含んで構成され、入力信号を各動作要素に通して得ら
れる信号の和に相当する信号を出力するものである。こ
こでは速度偏差信号ΔＮを入力し、それに対応する信号
を目標ベーン開度に′″を表す信号として出力する。こ
の目標ベーン開度に＊と開度検出器１４によって検出さ
れなベーン開度にとが突き合わされ、その偏差すなわち
ベーン開度偏差ΔＫ ＜−に’−Ｋ）が零となるように
サーボ機構１７を介してベーン開度が制御される。In Figure 3, the water turbine 2 and the power generation f connected to it are shown.
i4 constitutes a water turbine generator (ie, main engine). The power generated by the generator 4 is supplied to a power transmission line (not shown) via a circuit breaker 6.The generator 4 is an alternating current generator, and its output frequency is proportional to the rotational speed of the main engine. The rotational speed N of the main engine is detected by the speed detector 10 and compared with the target speed N'' corresponding to the reference frequency set by the frequency setter 11. The reference speed deviation signal ΔNo=N'' − obtained by this comparison By adding the load compensation signal ΔN1 for load compensation to PID
A speed deviation signal ΔN is generated which is input to the regulator 12. Load compensation! ! & Signal ΔN1 is the target vane opening M* corresponding to the load set by the load setting device 13 and the vane of the water turbine 2 (not shown) detected by the opening detector 14.
The change rate limiting circuit uses a signal representing the deviation between the opening degree and the change rate limit circuit]7
5, and through the load application signal contact 16. p
The rDp moderator 12 is well-known <P (proportional) operating element, ■
It is configured to include an (integral) operating element and a D (differential) operating element, and outputs a signal corresponding to the sum of signals obtained by passing an input signal through each operating element. Here, the speed deviation signal ΔN is input, and a signal corresponding to it is output as a signal representing the target vane opening. The vane opening is controlled via the servo mechanism 17 so that the deviation, that is, the vane opening deviation ΔK <- ('-K), becomes zero.
このベーン開度制御により水車２および発電機４からな
る主機の回転速度は周波数設定器１１によって設定され
る基準周波数相当の目標速度に制御される。Through this vane opening degree control, the rotational speed of the main engine consisting of the water turbine 2 and the generator 4 is controlled to a target speed corresponding to the reference frequency set by the frequency setting device 11.
第３図の装置において、負荷遮断試験を実施した場合を
考えてみる。負荷遮断を遮断器６の引外しによって代表
させて考えるものとする。負荷運転中の状態で遮断器６
の引外しにより負荷遮断を行うと、主機の回転速度Ｎは
無負荷速度に向って上昇し始める。このとき、速度制御
系においては、負荷投入信号接点１６は遮断器６の引外
しに連動してオフとされ、水車２のガイドベーンは、速
度設定器１０によって検出される主機の回転速度Ｎが周
波数設定器１１によって設定される目標速度Ｎ６に一致
するように、負の速度偏差信号ΔＮによりＰＩＤ調節器
１２およびサーボ機構１７を介して、閉鎖方向に制御さ
れる。Let us consider a case where a load shedding test is carried out using the apparatus shown in FIG. Load shedding is assumed to be represented by tripping of the circuit breaker 6. The circuit breaker 6 is activated during load operation.
When the load is interrupted by tripping, the rotational speed N of the main engine begins to increase toward the no-load speed. At this time, in the speed control system, the load application signal contact 16 is turned off in conjunction with the tripping of the circuit breaker 6, and the guide vanes of the water turbine 2 are controlled so that the rotational speed N of the main engine detected by the speed setting device 10 is It is controlled in the closing direction via the PID regulator 12 and the servo mechanism 17 by the negative speed deviation signal ΔN so as to match the target speed N6 set by the frequency setter 11.
この制御の過程で、いかに主機の速度上昇を抑えるかが
調速機としての性能の目安となる。ここで問題となるの
は、負荷遮断からガイドベーンが実際に閉鎖動作を開始
するまでの、いわゆる不動時間でである。この不動時間
では実質的に無制御時間であり、これをいかに短くする
かが速度上昇を抑えるためのキーポイントとなる。In the process of this control, how well the main engine's speed increase is suppressed is a measure of its performance as a speed governor. The problem here is the so-called immobility time from when the load is removed until the guide vane actually starts its closing operation. This non-moving time is essentially an uncontrolled time, and how to shorten this time is the key to suppressing speed increases.
第４図は負荷遮断時の負荷遮断信号、ガイドベーン開度
Ｋ、および主機回転速度Ｎの変化の一例を示すタイムチ
ャートである。ここには、上述の不動時間での存在によ
り比較的大きな速度上昇ΔＮ２ （−Ｎ−Ｎ” ）を生
じたことが示されている。不動時間τの後は、ガイドベ
ーンが閉鎖し始め、それに応じて主機の回転速度Ｎも徐
々に目標速度Ｎ＊に近づく様子が示されている。FIG. 4 is a time chart showing an example of changes in the load shedding signal, guide vane opening K, and main engine rotational speed N during load shedding. It is shown here that the presence of the dead time described above resulted in a relatively large speed increase ΔN2 (-N-N"). After the dead time τ, the guide vanes begin to close and Accordingly, the rotational speed N of the main engine also gradually approaches the target speed N*.
このような不動時間τはその大部分が速度偏差信号ΔＮ
を検知する検知部分の遅れに依存している。この遅れは
、アナログ式の演算回路の場合はほとんど無視できるか
、ディジタル式の演算回路の場合は原理的にスキャン動
作という避けることのできない時間帯が存在するために
必然的に発生してしまう。ディジタル式の場合のこの問
題は高速スキャンの可能なＣＰＵを用いることにより相
当の改善を達成することができるが、これはコスト面か
ら実現困難である。Most of this immobile time τ is due to the speed deviation signal ΔN
It depends on the delay in the detection part that detects. This delay can be almost ignored in the case of an analog arithmetic circuit, or it inevitably occurs in the case of a digital arithmetic circuit because there is an unavoidable period of scanning operation in principle. This problem in the digital system can be significantly improved by using a CPU capable of high-speed scanning, but this is difficult to realize due to cost considerations.
したがって本発明の課題は、ディジタル式に構成された
速度偏差検知部分を有しながらも負荷遮断に際して不動
時間による主機の速度上昇を小さな値に抑制し得る水ｉ
発電機の速度制御装置を提供することにある。Therefore, an object of the present invention is to provide a water i system that can suppress the speed increase of the main engine due to the immobility time to a small value during load shedding, even though it has a speed deviation detection part configured in a digital manner.
An object of the present invention is to provide a speed control device for a generator.
上記課題を解決するなめに本発明は、冒頭に述べた水車
発電機の速度制御装置において、調節器に、負荷遮断信
号に応動してＩ動作要素の出力をカイトベーンの無負荷
開度に相当する値に強制的にリセットする手段を設けた
ことを特徴とするものである。In order to solve the above problems, the present invention provides a speed control device for a water turbine generator as described at the beginning, in which a regulator is configured to adjust the output of the I operation element to correspond to the no-load opening of the kite vane in response to a load cutoff signal. This feature is characterized by providing means for forcibly resetting the value.
調節器におけるＩ動作要素の出力は常に現在のガイドベ
ーン開度相当の値になっている。この値は、あくまでも
入力信号（すなわち、はぼ速度面差）の積分値に対応し
ている。負荷遮断を行うことにより、従来装置において
は前述のごとく長い不動時間での存在により主機に大き
な速度上昇を来たすのであるが、負荷遮断信号に応動し
てＩ動作要素の出力をガイドベーンの無負荷開度相当の
値に強制的にリセットすることにより、不動時間τの大
きな部分を占める速度検知部の遅れの影響を事実上解消
させることができ、ガイドベーン閉鎖開始を早めて主機
の速度上昇を小幅に抑制することかできる。The output of the I operating element in the regulator is always a value corresponding to the current guide vane opening. This value corresponds to the integral value of the input signal (ie, the surface speed difference). By performing load shedding, in conventional equipment, the main engine speed increases significantly due to the long period of immobility as described above, but in response to the load shedding signal, the output of the I operation element is changed to the unloaded state of the guide vane. By forcibly resetting to a value equivalent to the opening, it is possible to virtually eliminate the effect of the delay in the speed detection unit, which accounts for a large portion of the immobility time τ, and accelerate the start of guide vane closure to increase the speed of the main engine. It is possible to suppress it to a small extent.
次に、本発明の実施例を図面に基づいて説明する。 Next, embodiments of the present invention will be described based on the drawings.
第１図に本発明の一実施例を示す。この第１図において
、第３図と重複する部分には同一の符号を附し、その詳
細な説明は省略する。FIG. 1 shows an embodiment of the present invention. In FIG. 1, parts that overlap with those in FIG. 3 are given the same reference numerals, and detailed explanation thereof will be omitted.
第１図の装置と第３図の装置との相違点は、前者のＰＩ
Ｄ調節器２０が後者のＰＩＤ調節器１２とは異なる点に
ある。ＰＩＤ調節器２０はＰ動作要素２１、■動作要素
２２、およびＤ動作要素２３を持っているが、■動作要
素２２に無負荷開度リセット手段２４を付加的に設けて
いるのが特徴である。無負荷開度リセット手段２４は、
負荷遮断信号が入力されることにより■動作要素２２の
出力を水車２のガイドベーンの無負荷開度相当の値に強
制的にリセットする。これによりＰＩＤ調節器２０から
出力される目標ベーン開度に＊を表す信号は瞬時に無負
荷開度相当に減衰され、第２図に示すように、よりわず
かな不動時間での後にガイドベーンを閉鎖させ、水車２
の回転上昇を早めに抑制し、ここに主機の速度上昇ΔＮ
を小幅に抑制することができる。The difference between the device in Figure 1 and the device in Figure 3 is that the former's PI
The D regulator 20 differs from the latter PID regulator 12 in one point. The PID regulator 20 has a P operating element 21, a ■ operating element 22, and a D operating element 23, and is characterized in that the operating element 22 is additionally provided with a no-load opening reset means 24. . The no-load opening reset means 24 is
By inputting the load cutoff signal, (1) the output of the operating element 22 is forcibly reset to a value corresponding to the no-load opening of the guide vane of the water turbine 2; As a result, the signal representing * for the target vane opening output from the PID controller 20 is instantaneously attenuated to correspond to the no-load opening, and as shown in Fig. 2, the guide vane is activated after a shorter period of immobility. Close waterwheel 2
The speed increase of the main engine is suppressed early, and the speed increase ΔN of the main engine is reduced.
can be suppressed to a small extent.
なお、従来ＰＩＤ調節器の定数設定を負荷時と無負荷時
とで切換える場合、設定いかんによっては負荷遮断後に
定数切換により主機回転速度に、いわゆる二次上昇を生
ずることがあり、これを無くすためにＰＩＤ定数の再調
整を行うなどの必要があったが、本発明によればそのよ
うな二次上昇も全く無くなるので、現地調整が非常に容
易になる。In addition, when changing the constant setting of a conventional PID controller between load and no-load conditions, depending on the setting, changing the constant after load interruption may cause a so-called secondary increase in the main engine rotational speed. However, according to the present invention, such secondary increases are completely eliminated, making on-site adjustment extremely easy.
又、カブラン水車でよく見られるが、負荷遮断の後、ラ
ンナのブレーキ作用による回転数のおち込みなどにおい
ても、本発明により、そのエリセットタイムの調整でお
ち込みを容易に無くす事もでき、トランスの低周波過励
磁の防止に役立つ。In addition, even when the rotation speed dips due to the braking action of the runner after load shedding, which is often seen in Kabran water turbines, the present invention can easily eliminate the dip by adjusting the reset time. Helps prevent low frequency overexcitation of transformers.
以上述べたように本発明によれば、負荷遮断に際して不
動時間を大幅に短縮化し、主機の速度上昇を小さな値に
抑制することができる。As described above, according to the present invention, it is possible to significantly shorten the immobility time upon load shedding, and to suppress the increase in speed of the main engine to a small value.
第１図は本発明による水車発電機の速度制御装置の一実
施例を示すブロック図、第２図は第１図の装置の動作例
を示すタイムチャート、第３図は従来の速度制御装置の
ブロック図、第４図は第３図の装置の動作例を示すタイ
ムチャートである。
２・・・水車、４・・・発′ｒｊｈＲ１１０・・・速度
検出器、１１・・・周波数設定器、１３・・・負荷設定
器、１４・・・開度検出器、１５・・・変化率制限回路
、１６・・・負荷投入信号接点、１７・・・サーボ機構
、２０・・・ＰＩＤ調節器、２１・・・Ｐ動作要素、２
２・・・Ｉ動作要素、２３・・・Ｄ動作要素、２４・・
・無負荷開度リセット手段。FIG. 1 is a block diagram showing an embodiment of the speed control device for a water turbine generator according to the present invention, FIG. 2 is a time chart showing an example of the operation of the device in FIG. 1, and FIG. The block diagram and FIG. 4 are time charts showing an example of the operation of the device shown in FIG. 2... Water turbine, 4... Start'rjhR110... Speed detector, 11... Frequency setting device, 13... Load setting device, 14... Opening degree detector, 15... Change Rate limiting circuit, 16... Load application signal contact, 17... Servo mechanism, 20... PID controller, 21... P operating element, 2
2...I action element, 23...D action element, 24...
・No-load opening reset means.
Claims (1)
回転速度が目標速度に一致するように、少なくともＰ動
作要素およびＩ動作要素を含むディジタル型の調節器を
介して制御する水車発電機の速度制御装置において、 前記調整器に、負荷遮断信号に応動して前記Ｉ動作要素
の出力を前記ガイドベーンの無負荷開度に相当する値に
強制的にリセットする手段を設けたことを特徴とする水
車発電機の速度制御装置。[Claims] The opening degree of a guide vane of a water turbine connected to a generator is controlled via a digital regulator including at least a P operating element and an I operating element so that the rotational speed of the water turbine matches a target speed. In the speed control device for a water turbine generator, the regulator includes means for forcibly resetting the output of the I operation element to a value corresponding to the no-load opening of the guide vane in response to a load cutoff signal. A speed control device for a water turbine generator, characterized in that it is provided with a.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63067329A JP2635356B2 (en) | 1988-03-23 | 1988-03-23 | Speed control device of turbine generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63067329A JP2635356B2 (en) | 1988-03-23 | 1988-03-23 | Speed control device of turbine generator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01240775A true JPH01240775A (en) | 1989-09-26 |
| JP2635356B2 JP2635356B2 (en) | 1997-07-30 |
Family
ID=13341874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63067329A Expired - Lifetime JP2635356B2 (en) | 1988-03-23 | 1988-03-23 | Speed control device of turbine generator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2635356B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06311795A (en) * | 1993-04-23 | 1994-11-04 | Meidensha Corp | Digital control system for hydroelectric power station |
| JP2010229962A (en) * | 2009-03-30 | 2010-10-14 | Mitsubishi Electric Corp | Hydraulic turbine and speed governing controller for pump turbine |
| CN110966137A (en) * | 2019-12-23 | 2020-04-07 | 国网新源控股有限公司回龙分公司 | Secondary shutdown control method for pumped storage unit |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5526059A (en) * | 1978-08-16 | 1980-02-25 | Hitachi Ltd | Water wheel speed governor |
| JPS5912177A (en) * | 1982-07-14 | 1984-01-21 | Fuji Electric Co Ltd | Increase and decrease method of revolving speed of valve water wheel |
| JPS5946373A (en) * | 1982-09-10 | 1984-03-15 | Toshiba Corp | Controller for speed of water wheel |
| JPS60164675A (en) * | 1984-02-07 | 1985-08-27 | Toshiba Corp | Speed controller for waterwheel |
| JPS60209670A (en) * | 1984-04-02 | 1985-10-22 | Mitsubishi Electric Corp | Control device for variable head hydraulic electric power plant |
-
1988
- 1988-03-23 JP JP63067329A patent/JP2635356B2/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5526059A (en) * | 1978-08-16 | 1980-02-25 | Hitachi Ltd | Water wheel speed governor |
| JPS5912177A (en) * | 1982-07-14 | 1984-01-21 | Fuji Electric Co Ltd | Increase and decrease method of revolving speed of valve water wheel |
| JPS5946373A (en) * | 1982-09-10 | 1984-03-15 | Toshiba Corp | Controller for speed of water wheel |
| JPS60164675A (en) * | 1984-02-07 | 1985-08-27 | Toshiba Corp | Speed controller for waterwheel |
| JPS60209670A (en) * | 1984-04-02 | 1985-10-22 | Mitsubishi Electric Corp | Control device for variable head hydraulic electric power plant |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06311795A (en) * | 1993-04-23 | 1994-11-04 | Meidensha Corp | Digital control system for hydroelectric power station |
| JP2010229962A (en) * | 2009-03-30 | 2010-10-14 | Mitsubishi Electric Corp | Hydraulic turbine and speed governing controller for pump turbine |
| CN110966137A (en) * | 2019-12-23 | 2020-04-07 | 国网新源控股有限公司回龙分公司 | Secondary shutdown control method for pumped storage unit |
| CN110966137B (en) * | 2019-12-23 | 2021-02-05 | 国网新源控股有限公司回龙分公司 | Secondary shutdown control method for pumped storage unit |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2635356B2 (en) | 1997-07-30 |
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