CA1084809A - Automatic hydraulic turbine starting device - Google Patents
Automatic hydraulic turbine starting deviceInfo
- Publication number
- CA1084809A CA1084809A CA292,065A CA292065A CA1084809A CA 1084809 A CA1084809 A CA 1084809A CA 292065 A CA292065 A CA 292065A CA 1084809 A CA1084809 A CA 1084809A
- Authority
- CA
- Canada
- Prior art keywords
- hydraulic turbine
- gate
- speed
- turbine
- wicket
- 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
Links
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
Landscapes
- Control Of Water Turbines (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
An automatic hydraulic turbine starting device, compris-ing a gate limit mechanism limiting the width of opening of the wicket gate of said hydraulic turbine, and an actuating element of the sensor of the head of the water supplied to said hydraulic turbine, said element having a profile cam, said mechanism and said element being connected with the main distributing valve of the wicket gate servomotor through a leverage. The gate limit mechanism is connected with the actuating element of the water head sensor through a kinema-tic linkage comprising a lever connected with a solenoid core, the speed switch of the hydraulic turbine being con-nected into the circuit of the solenoid winding, and the speed switch being adjusted to operate on attainment of the predetermined rotational speed by the hydraulic turbine ro-tor. The proposed device enables a gradual rotational speed rise to be attained by the hydraulic turbine rotor until the rated speed is achieved, while the hydraulic turbine overspeed at startup is obviated.
An automatic hydraulic turbine starting device, compris-ing a gate limit mechanism limiting the width of opening of the wicket gate of said hydraulic turbine, and an actuating element of the sensor of the head of the water supplied to said hydraulic turbine, said element having a profile cam, said mechanism and said element being connected with the main distributing valve of the wicket gate servomotor through a leverage. The gate limit mechanism is connected with the actuating element of the water head sensor through a kinema-tic linkage comprising a lever connected with a solenoid core, the speed switch of the hydraulic turbine being con-nected into the circuit of the solenoid winding, and the speed switch being adjusted to operate on attainment of the predetermined rotational speed by the hydraulic turbine ro-tor. The proposed device enables a gradual rotational speed rise to be attained by the hydraulic turbine rotor until the rated speed is achieved, while the hydraulic turbine overspeed at startup is obviated.
Description
AUTOMATIC HYDRAULIC TURBINE STARTING DEVICE
The present invention relates to hydraulic tubine con-trol arrangements, and more particularly to automatic hydraulic turbine starting devices.
The invention can most advantageously be used in turbo-generator units with relatively small flywheel moments, operating at considerable water head variations at a hydro-electric power station.
Setting the width of the initial opening of the wicket gate is especially important during turbine startup, for it serves to admit water to the turbine runner. The initial opening of the wicket gate provides for a turbine rotor torque sufficient for the rotor start running and gradually gain the rated speed of rotation. ;
Under unfavourable turbine operating conditions, e.g. in the case of wide water head variations, the setting adjustment of the initial opening according to head becomes vital because the in-ability to adjust the opening in accordance with water head varia-tiGns leads to deterioration of the turbine startup conditions and even to a possible failure of the turbine.
Known in the art is a device (cf. USSR Inventor's Certi-ficate No. 271,402), wherein a mechanism for limiting the opening of the hydraulic turbine wicket gate, and a water head sensor actuating element with a profile cam are provided in a hydraulic turbine starting system, said mechanism and element being indepen-dently connected with the main distributing valve of the wicket gate servomotor via leverage, said valve being hydraulically con-nected with said servomotor.
The device serves to open the wicket gate to the re-quired initial opening width at the moment of turbine startup, said width remaining unchanged until the turbine rotor speed governor starts operating. The rated rotational speed of the turbine rotor having been achieved, the governor takes over 1~84809 whereby the wicket gate initial opening width is automatically reduced to a width corresponding to no-load operation of the turbine.
The initial gate opening width at which the turbine rotor starts running and constituting from 20 to 30 per cent of the maximum gate opening is much greater than the width corres-ponding to no-load operation, which is from 10 to 15 per cent of maximum opening. This may result in an overshoot of the rotational speed of the rotor during the turbine startup period, which is especially true in the case of turbo-generator units with small flywheel moments; also, a turbine overspeed may occur in case the automatic speed governor fails.
Manual adjustment of the initial gate opening along with automatic limiting of the maximum gate opening according to head are accomplished in the above device. No automatic correction of the initial opening is effected, which may generally result in an overshoot of the rotor speed at high heads or in deterioation of startup conditions, namely, in the rotor's inability to start running at low heads.
With these and other objects in view there is proposed an automatic starting hydraulic turbine device, comprising a gate limit mechanism and a water head sensor actuating element with a profile cam, said mechanism and said element being connected with a main distributing valve of a gate servomotor via a leverage, while the gate limit mechanism, according to the invention, is kinematically linked with the water head sensor actuating element by means of a lever, connected to a solenoid core with a speed switch connected in the winding circuit of said solenoid, said speed switch being adjusted to operate at a predetermined speed achieved by a hydraulic turbine rotor.
It is expedient that the speed switch be adjusted to operate at a speed from 30 to 50 per cent of the rated rotational 1~84~09 speed of the turbine rotor.
The proposed automatic hydraulic turbine starting device permits a smooth startup, vlz. a gradual rise in the rotor speed until its rated value is reached.
These and other objects and advantages of the present invention will be readily apparent from the following detailed description of specific embodiments thereof, taken in conjunction with the accompan~7ing drawings, wherein:
Fig. 1 is a block diagram with kinematic links of an .
automatie hydraulie turbine starting deviee, according to the invention;
Fig. 2 is a graph showing changes in the hydraulic tur-bine gate opening width at startup, effeeted by the automatic starting device according to the invention.
The automatic hydraulic turbine starting device com-prises a gate limit meehanism 1 of a wicket gate 2, ineluding a threaded rod 3 eonnected with a shaft 5 by means of a worm couple 4, the shaft 5 having cams 6 operatively associated with micro-eontacts 7 of a drive motor 8 of the threaded rod 3. The threaded rod 3 of the gate limit mechanism 1 is connected with a rod 16 via a leverage comprising levers 9 and 10, a shaft 11 rotatable in bearings 12, levers 13, 14 and 15, said rod 16 belonging to a main distributing valve 17 hydraulically connected with a servo-motor 19 via transmissions 18. A rod 20 of the servomotor 19 is eonneeted with the wicket gate 2. The automatic hydraulic tur-bine starting device also comprises an actuating element 21 of a water head sensor 22, said element including a rotatable profile cam 23. The profile cam 23 of the actuating element 21 is intro-dueed into the kinematic linkage between the gate limit mechanism 1 and the main distributing valve 17 at a point 25 by means of the lever 9 urged by a spring 24. A core 27 of a solenoid 28 is introduced into the same linkage via a portion 26 of the lever 9, 11)8~809 with the speed switch 30 being connected in the electric circuit of a solenoid winding 29 and being adjusted to operate at a speed from 30 to 50 per cent of the rated speed of the rotor. Thus, the gate limit mechanism 1 of the wicket gate 2 and the actuating element 21 of the water head sensor 22 are interconnected via the lever 9.
An actuating element 31 of a turbine rotor speed governor (not shown) is also operatively associated with the rod 16 of the main distributing valve 17. Besides, the servomotor 19 of the wicket gate 2 is connected with the main distributing valve 17 by means of the reversed kinematic linkage, by virtue of the rod 20 of the servomotor 19 and the rod 16 of the main distributing valve ; 17 being interconnected via levers 32 and 15.
The operation of the above described automatic hydraulic turbine starting device is as follows.
Prior to startup, the winding 29 of the solenoid 28 is de-energized, the core 27 of the solenoid 28 is in the uppermost position, while the threaded rod 3 of the gate limit mechanism 1 of the wicket gate 2 is in the lowermost position. Meanwhile, one end of the spring-loaded lever 9 is pressed against the profile cam 23, its other end being pressed against the threaded rod 3.
At the same time, the rod 16 of the main distributing valve 17 is displaced for closing, the servomotor 19 being in a fully closed position. The operation of the automatic starting device elements for closing the wicket gate 2 is indicated by arrows in the draw-ing. The direction of the operating fluid fed to the main distri-buting valve 17 and sump is also indicated by arrows.
At turbine startup, the drive motor 8 of the threaded rod 3 of the gate limit mechanism 1 of the wicket gate 2 becomes energized, initiating upward movement of the threaded rod 3. The threaded rod 3 moves upward covering a distance preset by means of the cams 6 on the shaft 5, said distance corresponding to the lOB4809 width of the initial opening of the wicket gate 2, depending on the water head, mode of operation and type of turbine. The dis-placement of the threaded rod 3 sets into motion thelevers 9, 10, the shaft 11, the levers 13, 14 and 15, actuating the rod 16 of the main distributing value 17, thereby setting the servomotor 19 to the initial opening position of the wicket gate 2. The open-ing of the wicket gate 2 results in rotation of the turbine rotor, caused by water coming to the runner. Meanwhile, the core 27 of the solenoid 28 remains in the uppermost position.
The described stage of the automatic starting device's operation is in conformity with rising portion A of a curve 33 on the graph showing changes in the opening width of the wicket gate
The present invention relates to hydraulic tubine con-trol arrangements, and more particularly to automatic hydraulic turbine starting devices.
The invention can most advantageously be used in turbo-generator units with relatively small flywheel moments, operating at considerable water head variations at a hydro-electric power station.
Setting the width of the initial opening of the wicket gate is especially important during turbine startup, for it serves to admit water to the turbine runner. The initial opening of the wicket gate provides for a turbine rotor torque sufficient for the rotor start running and gradually gain the rated speed of rotation. ;
Under unfavourable turbine operating conditions, e.g. in the case of wide water head variations, the setting adjustment of the initial opening according to head becomes vital because the in-ability to adjust the opening in accordance with water head varia-tiGns leads to deterioration of the turbine startup conditions and even to a possible failure of the turbine.
Known in the art is a device (cf. USSR Inventor's Certi-ficate No. 271,402), wherein a mechanism for limiting the opening of the hydraulic turbine wicket gate, and a water head sensor actuating element with a profile cam are provided in a hydraulic turbine starting system, said mechanism and element being indepen-dently connected with the main distributing valve of the wicket gate servomotor via leverage, said valve being hydraulically con-nected with said servomotor.
The device serves to open the wicket gate to the re-quired initial opening width at the moment of turbine startup, said width remaining unchanged until the turbine rotor speed governor starts operating. The rated rotational speed of the turbine rotor having been achieved, the governor takes over 1~84809 whereby the wicket gate initial opening width is automatically reduced to a width corresponding to no-load operation of the turbine.
The initial gate opening width at which the turbine rotor starts running and constituting from 20 to 30 per cent of the maximum gate opening is much greater than the width corres-ponding to no-load operation, which is from 10 to 15 per cent of maximum opening. This may result in an overshoot of the rotational speed of the rotor during the turbine startup period, which is especially true in the case of turbo-generator units with small flywheel moments; also, a turbine overspeed may occur in case the automatic speed governor fails.
Manual adjustment of the initial gate opening along with automatic limiting of the maximum gate opening according to head are accomplished in the above device. No automatic correction of the initial opening is effected, which may generally result in an overshoot of the rotor speed at high heads or in deterioation of startup conditions, namely, in the rotor's inability to start running at low heads.
With these and other objects in view there is proposed an automatic starting hydraulic turbine device, comprising a gate limit mechanism and a water head sensor actuating element with a profile cam, said mechanism and said element being connected with a main distributing valve of a gate servomotor via a leverage, while the gate limit mechanism, according to the invention, is kinematically linked with the water head sensor actuating element by means of a lever, connected to a solenoid core with a speed switch connected in the winding circuit of said solenoid, said speed switch being adjusted to operate at a predetermined speed achieved by a hydraulic turbine rotor.
It is expedient that the speed switch be adjusted to operate at a speed from 30 to 50 per cent of the rated rotational 1~84~09 speed of the turbine rotor.
The proposed automatic hydraulic turbine starting device permits a smooth startup, vlz. a gradual rise in the rotor speed until its rated value is reached.
These and other objects and advantages of the present invention will be readily apparent from the following detailed description of specific embodiments thereof, taken in conjunction with the accompan~7ing drawings, wherein:
Fig. 1 is a block diagram with kinematic links of an .
automatie hydraulie turbine starting deviee, according to the invention;
Fig. 2 is a graph showing changes in the hydraulic tur-bine gate opening width at startup, effeeted by the automatic starting device according to the invention.
The automatic hydraulic turbine starting device com-prises a gate limit meehanism 1 of a wicket gate 2, ineluding a threaded rod 3 eonnected with a shaft 5 by means of a worm couple 4, the shaft 5 having cams 6 operatively associated with micro-eontacts 7 of a drive motor 8 of the threaded rod 3. The threaded rod 3 of the gate limit mechanism 1 is connected with a rod 16 via a leverage comprising levers 9 and 10, a shaft 11 rotatable in bearings 12, levers 13, 14 and 15, said rod 16 belonging to a main distributing valve 17 hydraulically connected with a servo-motor 19 via transmissions 18. A rod 20 of the servomotor 19 is eonneeted with the wicket gate 2. The automatic hydraulic tur-bine starting device also comprises an actuating element 21 of a water head sensor 22, said element including a rotatable profile cam 23. The profile cam 23 of the actuating element 21 is intro-dueed into the kinematic linkage between the gate limit mechanism 1 and the main distributing valve 17 at a point 25 by means of the lever 9 urged by a spring 24. A core 27 of a solenoid 28 is introduced into the same linkage via a portion 26 of the lever 9, 11)8~809 with the speed switch 30 being connected in the electric circuit of a solenoid winding 29 and being adjusted to operate at a speed from 30 to 50 per cent of the rated speed of the rotor. Thus, the gate limit mechanism 1 of the wicket gate 2 and the actuating element 21 of the water head sensor 22 are interconnected via the lever 9.
An actuating element 31 of a turbine rotor speed governor (not shown) is also operatively associated with the rod 16 of the main distributing valve 17. Besides, the servomotor 19 of the wicket gate 2 is connected with the main distributing valve 17 by means of the reversed kinematic linkage, by virtue of the rod 20 of the servomotor 19 and the rod 16 of the main distributing valve ; 17 being interconnected via levers 32 and 15.
The operation of the above described automatic hydraulic turbine starting device is as follows.
Prior to startup, the winding 29 of the solenoid 28 is de-energized, the core 27 of the solenoid 28 is in the uppermost position, while the threaded rod 3 of the gate limit mechanism 1 of the wicket gate 2 is in the lowermost position. Meanwhile, one end of the spring-loaded lever 9 is pressed against the profile cam 23, its other end being pressed against the threaded rod 3.
At the same time, the rod 16 of the main distributing valve 17 is displaced for closing, the servomotor 19 being in a fully closed position. The operation of the automatic starting device elements for closing the wicket gate 2 is indicated by arrows in the draw-ing. The direction of the operating fluid fed to the main distri-buting valve 17 and sump is also indicated by arrows.
At turbine startup, the drive motor 8 of the threaded rod 3 of the gate limit mechanism 1 of the wicket gate 2 becomes energized, initiating upward movement of the threaded rod 3. The threaded rod 3 moves upward covering a distance preset by means of the cams 6 on the shaft 5, said distance corresponding to the lOB4809 width of the initial opening of the wicket gate 2, depending on the water head, mode of operation and type of turbine. The dis-placement of the threaded rod 3 sets into motion thelevers 9, 10, the shaft 11, the levers 13, 14 and 15, actuating the rod 16 of the main distributing value 17, thereby setting the servomotor 19 to the initial opening position of the wicket gate 2. The open-ing of the wicket gate 2 results in rotation of the turbine rotor, caused by water coming to the runner. Meanwhile, the core 27 of the solenoid 28 remains in the uppermost position.
The described stage of the automatic starting device's operation is in conformity with rising portion A of a curve 33 on the graph showing changes in the opening width of the wicket gate
2 (Fig. 2), said curve being shown as a thick solid line. In this graph, time is plotted on the abscissa, while width Y of opening of the wicket gate 2 is plotted on the ordinates together with turbine rotor speed X, Y being expressed as percentage of the maximum width and X, in terms of the rated value.
On attainment of the predetermined width of opening of the wicket gate 2 (Fig. 1), the drive motor 8 is de-energized by means of the microcontacts 7, the threaded rod 3 stops moving, whereby opening of the wicket gate 2 discontinues. This takes place at instant Tl (Fig. 2) corresponding to a point 34 on the graph. Flat portion B of the curve 33 (Fig. 2) corresponds to a constant width of opening of the wicket gate 2 (Fig. 1) within this time interval. However, the turbine rotor speed goes on rising in conformity with a curve 35 represented on the graph as a thin solid curved line.
On attainment of 30 to 50 per cent of the rated speed by the rotor, the speed switch 30 (Fig. 1) starts to operate with further operation of the solenoid 28 at instant T2 (Fig. 2) cor-responding to a point 36 on portion B of the curve 33, thereby initiating the downward movement of the core 27 (Fig. 1) of the 348~9 solenoid 28, the portion 26 of lever 9, and levers 10, said por-tion 26 being connected with said core 27, and the lever 10 being connected with the levers 9. The movement of the core 27 is further transmitted to the levers 13, 14, 15 and the rod 16 of the main distributing valve 17, initiating displacement of the rod 20 of the servomotor 19 for closing the wicket gate 2, which corres-ponds to sloping portion C (Fig. 2) of the curve 33. The core 27 (Fig. 1) of the solenoid 28 is displaced to a position corres-ponding to an intermediate width of opening of the wicket gate 2, said width exceeding that corresponding to no-load operation by 2 to 4 per cent. This happens at instant T3 (Fig. 2) which cor-responds to a point 37 on portion C of the curve 33.
The intermediate width of opening of the wicket gate 2 is maintained till the rated speed of the rotor is achieved, which corresponds to flat portion D of the curve 33. The rotor having achieved the rated speed of rotation at instant T4 corresponding to a point 38 on the curve 33, the turbine speed governor reduces the opening of the wicket gate 2 down to the width corresponding to no-load operation, via its actuating element 31 (Fig. 1) acting upon the rod 16 of the main distributing valve 17. Synchroniza-tion of the generator (not shown) is effected during no-load oper-ation corresponding to flat portion E (Fig. 2) on the curve 33, the wicket gate 2 being opened to 10 to 15 per cent of the maxi-mum opening width. The generator having been synchronized, the wicket gate 2 is opened still wider to allow for normal operation of the turbine/rising portion F of the curve 33/.
Automatic changing of the initial opening width of the wicket gate 2, as well as of the width corresponding to no-load operation, according to head, is accomplished as follows.
A change in the water head is sensed by the head sensor 22 (Fig. 1), resulting in rotation of the profile cam 23 of the actuating element 21 of said sensor 22. The profile cam 23 rotating in either direction, a corresponding change in the posi-tion of the lever 9 takes place, the lever 9 interacting with the cam 23, while the resulting movement of the levers 10 con-nected with the lever 9, the shaft 11, the levers 13, 14 and 15 is transmitted to the servomotor 19 via the main distributing valve 17, bringing about a corresponding change in the opening width of the wicket gate 2.
The operation of the automatic starting device is illustrated in the graph (Fig. 2), wherein the operation at low head, indicated by an upper curve 39 is represented as a thick dot-and-dash line, whereas the operation at high head, indicated by a lower curve 40 is represented as a thick dashed line.
Analysis of the curves suggests that a correction accord-ing to head can be accomplished with the aid of the proposed device not only to change the initial opening width of the wicket gate, but also the intermediate width, which is by 2 - 4 per cent greater than that corresponding to no-load operation, said inter-mediate width being the one up to which the initial opening width is brought at the turbine operation time under consideration, viz.
both widths of the wicket gate opening increase at low head and decrease at high head.
The proposed automatic hydraulic turbine starting device, when compared to those known in the art, improves the turbine operating conditions, enhance its reliability, while overspeed or overshoot of the turbine speed at startup is obviated.
It is to be understood that various modifications and embodiments of the claimed automatic hydraulic turbine starting device are possible within the scope and nature of the present invention.
On attainment of the predetermined width of opening of the wicket gate 2 (Fig. 1), the drive motor 8 is de-energized by means of the microcontacts 7, the threaded rod 3 stops moving, whereby opening of the wicket gate 2 discontinues. This takes place at instant Tl (Fig. 2) corresponding to a point 34 on the graph. Flat portion B of the curve 33 (Fig. 2) corresponds to a constant width of opening of the wicket gate 2 (Fig. 1) within this time interval. However, the turbine rotor speed goes on rising in conformity with a curve 35 represented on the graph as a thin solid curved line.
On attainment of 30 to 50 per cent of the rated speed by the rotor, the speed switch 30 (Fig. 1) starts to operate with further operation of the solenoid 28 at instant T2 (Fig. 2) cor-responding to a point 36 on portion B of the curve 33, thereby initiating the downward movement of the core 27 (Fig. 1) of the 348~9 solenoid 28, the portion 26 of lever 9, and levers 10, said por-tion 26 being connected with said core 27, and the lever 10 being connected with the levers 9. The movement of the core 27 is further transmitted to the levers 13, 14, 15 and the rod 16 of the main distributing valve 17, initiating displacement of the rod 20 of the servomotor 19 for closing the wicket gate 2, which corres-ponds to sloping portion C (Fig. 2) of the curve 33. The core 27 (Fig. 1) of the solenoid 28 is displaced to a position corres-ponding to an intermediate width of opening of the wicket gate 2, said width exceeding that corresponding to no-load operation by 2 to 4 per cent. This happens at instant T3 (Fig. 2) which cor-responds to a point 37 on portion C of the curve 33.
The intermediate width of opening of the wicket gate 2 is maintained till the rated speed of the rotor is achieved, which corresponds to flat portion D of the curve 33. The rotor having achieved the rated speed of rotation at instant T4 corresponding to a point 38 on the curve 33, the turbine speed governor reduces the opening of the wicket gate 2 down to the width corresponding to no-load operation, via its actuating element 31 (Fig. 1) acting upon the rod 16 of the main distributing valve 17. Synchroniza-tion of the generator (not shown) is effected during no-load oper-ation corresponding to flat portion E (Fig. 2) on the curve 33, the wicket gate 2 being opened to 10 to 15 per cent of the maxi-mum opening width. The generator having been synchronized, the wicket gate 2 is opened still wider to allow for normal operation of the turbine/rising portion F of the curve 33/.
Automatic changing of the initial opening width of the wicket gate 2, as well as of the width corresponding to no-load operation, according to head, is accomplished as follows.
A change in the water head is sensed by the head sensor 22 (Fig. 1), resulting in rotation of the profile cam 23 of the actuating element 21 of said sensor 22. The profile cam 23 rotating in either direction, a corresponding change in the posi-tion of the lever 9 takes place, the lever 9 interacting with the cam 23, while the resulting movement of the levers 10 con-nected with the lever 9, the shaft 11, the levers 13, 14 and 15 is transmitted to the servomotor 19 via the main distributing valve 17, bringing about a corresponding change in the opening width of the wicket gate 2.
The operation of the automatic starting device is illustrated in the graph (Fig. 2), wherein the operation at low head, indicated by an upper curve 39 is represented as a thick dot-and-dash line, whereas the operation at high head, indicated by a lower curve 40 is represented as a thick dashed line.
Analysis of the curves suggests that a correction accord-ing to head can be accomplished with the aid of the proposed device not only to change the initial opening width of the wicket gate, but also the intermediate width, which is by 2 - 4 per cent greater than that corresponding to no-load operation, said inter-mediate width being the one up to which the initial opening width is brought at the turbine operation time under consideration, viz.
both widths of the wicket gate opening increase at low head and decrease at high head.
The proposed automatic hydraulic turbine starting device, when compared to those known in the art, improves the turbine operating conditions, enhance its reliability, while overspeed or overshoot of the turbine speed at startup is obviated.
It is to be understood that various modifications and embodiments of the claimed automatic hydraulic turbine starting device are possible within the scope and nature of the present invention.
Claims (2)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In a hydraulic turbine comprising a wicket gate having a servomotor for changing the width of opening of said wicket gates, a main distributing valve connected with said servo-motor and controlling the same, a speed switch operating at a predetermined rotational speed of the hydraulic turbine, a sensor of the head of the water supplied to the hydraulic turbine, a hydraulic turbine starting device comprising: a gate limit mechanism limiting the opening width of said wicket gate, said mechanism being connected with said main distributing valve through a leverage; an actuating element of said water head sensor, having a profile cam and connected with said main distributing valve through a leverage; a lever connecting said gate limit mechanism with said actuating element of said water head sensor; a solenoid having a core connected with said lever, and a winding, with said speed switch being connected into the winding circuit; said start-ing device automatically changing said wicket gate opening width at turbine startup at a given rotational speed of the hydraulic turbine, with simultaneous correction of said change being effected according to the actual water head.
2. A hydraulic turbine starting device as claimed in claim 1, wherein said speed switch is adjusted to operate on attainment of 30 to 50 per cent of the rated rotational speed by the hydraulic turbine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA292,065A CA1084809A (en) | 1977-11-30 | 1977-11-30 | Automatic hydraulic turbine starting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA292,065A CA1084809A (en) | 1977-11-30 | 1977-11-30 | Automatic hydraulic turbine starting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1084809A true CA1084809A (en) | 1980-09-02 |
Family
ID=4110174
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA292,065A Expired CA1084809A (en) | 1977-11-30 | 1977-11-30 | Automatic hydraulic turbine starting device |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1084809A (en) |
-
1977
- 1977-11-30 CA CA292,065A patent/CA1084809A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |