JPS63138170A - Guide vane shutting system for water wheel and reversible pump-turbine - Google Patents

Guide vane shutting system for water wheel and reversible pump-turbine

Info

Publication number
JPS63138170A
JPS63138170A JP61283395A JP28339586A JPS63138170A JP S63138170 A JPS63138170 A JP S63138170A JP 61283395 A JP61283395 A JP 61283395A JP 28339586 A JP28339586 A JP 28339586A JP S63138170 A JPS63138170 A JP S63138170A
Authority
JP
Japan
Prior art keywords
water pressure
guide vane
turbine
closing
iron pipe
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
Application number
JP61283395A
Other languages
Japanese (ja)
Inventor
Kazumi Kawakami
一美 川上
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fuji Electric Co Ltd
Original Assignee
Fuji Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fuji Electric Co Ltd filed Critical Fuji Electric Co Ltd
Priority to JP61283395A priority Critical patent/JPS63138170A/en
Publication of JPS63138170A publication Critical patent/JPS63138170A/en
Pending legal-status Critical Current

Links

Classifications

    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/20Hydro energy

Landscapes

  • Control Of Water Turbines (AREA)

Abstract

PURPOSE:To reduce the cost for water pressure iron pipe and the like by quickly closing a guide vane to a predetermined degree of opening when a water wheel etc. is shut from the load, and slowly closing after passage of a certain while, and thereby suppressing rise of the water pressure. CONSTITUTION:In case load shutoff is made during operation of a Francis turbine or a reversible pump-turbine with a small specific velocity, a guide vane is quickly closed to a certain predetermined degree of opening, which is maintained for a predetermined period of time T. Then the guide vane is slowly closed after passage of time T. Thereby water pressure rise in a water pressure iron pipe is suppressed to reduce cost for water pressure iron pipe etc. It is also made possible to reduce the water pressure drop in a tailrace so as to increase the suction height, so that the amount of excavation for power plant can be lessened to a great extent.

Description

【発明の詳細な説明】 (イ)産業上の利用分野 この発明は、水力発電所の主機である水車及びポンプ水
車のガイドベーン閉鎖方式に関する。
DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to a guide vane closing system for water turbines and pump water turbines, which are the main engines of hydroelectric power plants.

(ロ)従来技術 従来、比速度の小さなフランシス水車及びポンプ水車に
おいては、運転中に負荷遮断を行なったり、また何らか
の不測の原因により非常停止を行なう必要がある場合に
は、第2図に示すように負荷の急変後、殆ど急閉鎖した
後、少しの緩閉銀に移行する閉鎖方式、第3図に示すよ
うに急閉鎖を少しにし緩閉銀を長くする閉鎖方式、また
は第4図に示すように急閉鎖を少し行なった後、緩閉銀
を行ない、さらに急閉鎖を行なうようにした閉鎖方式が
知られている。
(b) Prior Art Conventionally, in Francis turbines and pump turbines with small specific speeds, when it is necessary to perform load shedding during operation or to perform an emergency stop due to some unforeseen cause, the system shown in Fig. 2 is used. As shown in Figure 3, there is a closing method that closes almost suddenly after a sudden change in load and then transitions to a slight slow closing, as shown in Figure 3, a closing system that makes the sudden closing a little and lengthens the slow closing, or as shown in Figure 4. As shown in the figure, a closing method is known in which a short sudden closing is performed, followed by a slow closing, and then a further sudden closing.

(ハ)発明が解決しようとする問題点 しかしながら、このような方式では、水車及びポンプ水
車の負荷遮断時には、水圧鉄管側の水圧上昇や放水路側
の水圧降下等が問題となる。また。
(c) Problems to be Solved by the Invention However, in such a system, when the load on the water turbine and the pump turbine is cut off, there are problems such as an increase in water pressure on the penstock side and a drop in water pressure on the side of the spillway. Also.

負荷遮断時の水車及びポンプ水車の回転上昇を抑えるた
めには発電機の慣性モーメントCD”を大きくすること
も効果があるが、コストアップになるという問題があり
、また発電機の慣性モーメントGD″には構造的な限界
があり、無制限に大きくできないという問題がある。
In order to suppress the increase in rotation of the water turbine and pump-turbine during load shedding, it is effective to increase the moment of inertia CD'' of the generator, but this increases the cost and also increases the moment of inertia GD'' of the generator. has a structural limit and cannot be increased indefinitely.

また、第5図はガイドベーン開度a、のそれぞれにおけ
る水力機械を通る流量Q及びランナの回転数nの関係を
曲線で示した図で、実線はガイドベーン開度が一定の場
合であり、二点鎖線は負荷遮断時の軌跡であり、一点鎖
線はランナウェイ曲線である。
Furthermore, Fig. 5 is a diagram showing the relationship between the flow rate Q passing through the hydraulic machine and the rotation speed n of the runner at each guide vane opening degree a, using a curve, and the solid line is when the guide vane opening degree is constant. The two-dot chain line is the locus at load shedding, and the one-dot chain line is the runaway curve.

この第5図の曲線において、ランナの回転数nが大きく
なると、流量Qが減小する部分Aが認められるが、これ
はランナ自体で流量を絞っているためである。
In the curve of FIG. 5, there is a part A where the flow rate Q decreases as the runner rotational speed n increases, but this is because the flow rate is throttled by the runner itself.

従って、上記従来の閉鎖方式では、ランナの回転数nが
大きくなって流量が減小する部分Aにおいてもガイドベ
ーンによって流量Qを絞るため。
Therefore, in the conventional closure system described above, the guide vane restricts the flow rate Q even in the portion A where the runner rotational speed n increases and the flow rate decreases.

水圧鉄管の水圧上昇や放水路の水圧降下が大きくなると
いう問題があった。
There were problems with the increase in water pressure in the penstock and the drop in water pressure in the spillway.

この発明は、上記流量が減少する部分Aにおいて、ガイ
ドベーン開度を閉じることなく、流量Qの減小を少しで
も少なくすることを目的とするものである。
The object of this invention is to minimize the decrease in the flow rate Q in the portion A where the flow rate decreases without closing the guide vane opening.

(ニ)問題点を解決するための手段 上記目的を達成するために1本発明では、水車及びポン
プ水車の負荷遮断時等に、ガイドベーンをまずあら力じ
め定められた開度まで急閉鎖し、次にその開度のままで
あらかじめ定められた時間経過した後、再度緩閉鎖する
ようにした。
(d) Means for solving the problem In order to achieve the above object, 1. In the present invention, when the load of a water turbine or a pump water turbine is interrupted, the guide vanes are first suddenly closed to a predetermined opening degree. Then, after a predetermined period of time has elapsed at that opening, the valve is gently closed again.

(ホ)作用 水車及びポンプ水車の負荷遮断時に、ガイドベーンをま
ずあらかじめ定められた開度まで急閉鎖し、次にランナ
の回転数が上昇すると流量が減少する領域では、ガイド
ベーンをその開度のまま保持することにより水圧鉄管の
水圧上昇を抑える。
(e) At the time of load interruption of the working water turbine and the pump water turbine, the guide vanes are first suddenly closed to a predetermined opening, and then in the region where the flow rate decreases as the runner rotation speed increases, the guide vanes are closed to that opening. By keeping it as it is, the increase in water pressure in the penstock can be suppressed.

(へ)実施例 第1図は1本発明によるガイドベーンの閉鎖特性線図で
、ガイドベーン開度が大きく回転数が上昇しても流量が
あまり変化しない部分ア(ランナの回転数nの上昇によ
りランナ自体で流量Qをあまり絞られない第5図の領域
B)において、まずガイドベーンを急閉鎖する。この理
由はガイドベーン開度a0の大きな所でランナウェイn
lIに入ると、振動等の悪響影が出るのを防ぐためであ
る。
(f) Embodiment Figure 1 is a diagram showing the closing characteristics of the guide vane according to the present invention, where the flow rate does not change much even when the guide vane opening is large and the rotational speed increases (as the rotational speed n of the runner increases). In region B) of FIG. 5, where the flow rate Q cannot be reduced much by the runner itself, the guide vane is first abruptly closed. The reason for this is that when the guide vane opening degree a0 is large, the runaway n
This is to prevent harmful effects such as vibrations from occurring when entering lI.

次に、第1図の部分イ(X点からY点まで、第5図の領
域A)では、ガイドベーン開度a0を一定にしておく、
そして、第1図の部分つにおいて、即ち第5図の領域C
に入ってから再度ガイドベーンを緩閉鎖し始める。具体
的には、水圧鉄管の水圧の最大値と放水路の水圧の最小
値が過ぎた所でガイドベーンを再閉鎖し、全閉までもっ
ていく。
Next, in part A of FIG. 1 (from point X to point Y, region A of FIG. 5), the guide vane opening degree a0 is kept constant.
Then, in part 1 of FIG. 1, that is, area C of FIG.
After that, start gently closing the guide vane again. Specifically, the guide vanes are reclosed once the maximum water pressure in the penstock and the minimum water pressure in the spillway have passed, and the vanes are fully closed.

これによって水圧鉄管の水圧の上昇または放水路の水圧
の降下をより小さく抑えることができる。
This makes it possible to further suppress the increase in water pressure in the penstock or the drop in water pressure in the waterway.

(ト)発明の効果 以上の説明から明らかなように1本発明によれば、水圧
上昇を抑えることにより、水圧鉄管等のコストを低限す
ることができ、かつ放水路の水圧降下量を小さくできる
ため、吸出し高さH5を高くできるため1発電所の掘削
量を大幅に小さくできることとなり1発電所の大幅なコ
ストダウンが可能となる。
(G) Effects of the Invention As is clear from the above explanation, (1) according to the present invention, by suppressing the increase in water pressure, the cost of penstocks, etc. can be reduced, and the amount of water pressure drop in the spillway can be reduced. Since the suction height H5 can be increased, the amount of excavation per power plant can be significantly reduced, and the cost of one power plant can be significantly reduced.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明によるガイドベーンの閉鎖特性線図、第
2図〜第4図は従来のガイドベーン閉鎖方式方法による
制御特性線図、第5図は水力機械のガイドベーン開度に
おける流量と回転数の関係及び運転特性を示した図であ
る。 代理人弁理士 湯 浅 恭1・:三;、(外5名)・シ
゛、び・1 LLSeCノ
Fig. 1 is a closing characteristic diagram of the guide vane according to the present invention, Figs. 2 to 4 are control characteristic diagrams according to the conventional guide vane closing method, and Fig. 5 is a diagram showing the flow rate and flow rate depending on the guide vane opening of the hydraulic machine. FIG. 3 is a diagram showing the relationship between rotational speeds and operating characteristics. Representative Patent Attorney Kyo Yuasa 1:3; (5 others) LLSeC

Claims (1)

【特許請求の範囲】[Claims] 1)水車及びポンプ水車の負荷遮断時等に、ガイドベー
ンをまずあらかじめ定められた開度まで急閉鎖し、次に
その開度のままであらかじめ定められた時間経過した後
、再度緩閉鎖することを特徴とする水車及びポンプ水車
のガイドベーン閉鎖方式。
1) When the load of a water turbine or pump-turbine is interrupted, etc., the guide vanes are first suddenly closed to a predetermined opening, and then, after a predetermined period of time has elapsed at that opening, the guide vanes are gently closed again. A guide vane closing system for water turbines and pump water turbines featuring:
JP61283395A 1986-11-28 1986-11-28 Guide vane shutting system for water wheel and reversible pump-turbine Pending JPS63138170A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP61283395A JPS63138170A (en) 1986-11-28 1986-11-28 Guide vane shutting system for water wheel and reversible pump-turbine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61283395A JPS63138170A (en) 1986-11-28 1986-11-28 Guide vane shutting system for water wheel and reversible pump-turbine

Publications (1)

Publication Number Publication Date
JPS63138170A true JPS63138170A (en) 1988-06-10

Family

ID=17664962

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61283395A Pending JPS63138170A (en) 1986-11-28 1986-11-28 Guide vane shutting system for water wheel and reversible pump-turbine

Country Status (1)

Country Link
JP (1) JPS63138170A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5083721A (en) * 1973-11-28 1975-07-07
JPS52118140A (en) * 1976-03-29 1977-10-04 Toshiba Corp Guide vane closing appliance for hydraulic machine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5083721A (en) * 1973-11-28 1975-07-07
JPS52118140A (en) * 1976-03-29 1977-10-04 Toshiba Corp Guide vane closing appliance for hydraulic machine

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