CN113418663B - Leakage detection method for hydraulic system of hydraulic turbine governor - Google Patents
Leakage detection method for hydraulic system of hydraulic turbine governor Download PDFInfo
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- CN113418663B CN113418663B CN202011620147.2A CN202011620147A CN113418663B CN 113418663 B CN113418663 B CN 113418663B CN 202011620147 A CN202011620147 A CN 202011620147A CN 113418663 B CN113418663 B CN 113418663B
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- 238000001514 detection method Methods 0.000 title claims abstract description 30
- 239000003921 oil Substances 0.000 claims abstract description 34
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 29
- 238000004146 energy storage Methods 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000012544 monitoring process Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 15
- 230000008569 process Effects 0.000 claims description 12
- 230000009467 reduction Effects 0.000 claims description 9
- 230000009471 action Effects 0.000 abstract description 8
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 230000032683 aging Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002650 habitual effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
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- 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Control Of Water Turbines (AREA)
Abstract
The invention discloses a leakage detection method of a hydraulic system of a hydraulic turbine speed regulator, which is used for monitoring the self-loss condition of the hydraulic system of the speed regulator in a period of time when external energy storage input and output are not carried out, wherein the external energy storage input refers to whether an oil pump motor starts to work or not, and is judged by whether the pressure of hydraulic oil rises or not; the external energy storage output refers to whether a control output exists in a hydraulic system of the speed regulator or not, and is judged by whether the opening degree of a guide vane of the water turbine is changed or not; the degree of loss of stored energy of the hydraulic system is expressed by the decreasing rate of the pressure value of the hydraulic oil. According to the leakage detection method for the hydraulic system of the water turbine speed regulator, the intermittent action characteristic of the hydraulic system of the speed regulator is fully utilized, the silence time of the hydraulic system can reach more than 90%, namely, the oil pump motor is not started and the hydraulic system is not controlled to be output, so that whether the hydraulic system of the speed regulator has leakage or not can be detected on line in real time, and the blank is filled.
Description
Technical Field
The invention relates to the technical field of hydroelectric generating sets, in particular to a hydraulic system leakage detection method of a hydraulic turbine governor.
Background
At present, most hydroelectric generating sets of hydropower stations use a hydraulic speed regulator, hydraulic oil pressure is generated through intermittent short-time oil pumping action of an oil pump motor to realize energy storage of a hydraulic system, the hydraulic oil pressure of the hydraulic system is kept stable in a narrow range for a long time, and then the opening action of a guide vane of a water turbine is controlled by utilizing energy output stored by the hydraulic system, so that the stability of the frequency of the hydroelectric generating set and the adjustment of active load are realized.
In order to meet the control requirement of the hydroelectric generating set in the hydraulic system of the speed regulator, the hydraulic system is provided with an action oil cylinder and a hydraulic control valve, wherein the hydraulic oil on one side of a valve core of the action oil cylinder and the hydraulic control valve is pressurized, and the other side of the valve core of the action oil cylinder and the hydraulic control valve is pressureless; if the valve core is worn frequently or aged and poor in tightness, hydraulic oil can automatically leak to the pressureless side from the pressureless side through the valve core, so that the self-loss of energy storage energy of the hydraulic system is caused, the oil pump motor of the speed regulator is started frequently, the power consumption is increased, the service life of the oil pump motor is shortened, the temperature of the hydraulic oil is increased, the ageing of sealing rubber in the hydraulic system is accelerated, and meanwhile, the hydraulic system is seriously leaked, and huge risks are possibly caused because the guide vane of the hydraulic turbine cannot be automatically closed by the energy storage of the hydraulic system when the hydropower station loses electricity. Therefore, real-time detection of governor hydraulic system leakage is necessary.
Because the valve cores are sealed in the metal structure, hydraulic oil leakage cannot be directly seen, and the hydraulic oil leakage cannot be detected by directly installing a sensor, and the hydraulic oil leakage can be detected only in an indirect mode.
At present, many medium-sized and small hydropower stations do not pay attention to the leakage problem of the hydraulic system of the hydraulic turbine speed regulator, and certainly, the leakage problem can also be related to the fact that a better detection means is not available, so that the oil pump motor on the speed regulator is frequently required to be replaced, and a habitual thinking of periodic replacement is formed. Some power stations with better management are roughly judged by observing the frequent degree of starting of the oil pump motor of the governor by a power station operator, but the problem is that the oil pump motor is frequently started when a hydroelectric generating set is started, stopped and normally adjusts the load, so that the operator on duty of the power station often has misjudgment and can not know the leakage degree, and the operator is difficult to overhaul due to no reliable data support, therefore, the leakage detection method of the hydraulic system of the governor of the water turbine is provided.
Disclosure of Invention
The invention aims to provide a hydraulic system leakage detection method of a hydraulic turbine governor, which aims to solve the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions: the leakage detection method is used for monitoring the self-loss condition of the hydraulic system of the hydraulic turbine in a period of time when the hydraulic system of the hydraulic turbine has no external energy storage input and output, wherein the external energy storage input refers to whether an oil pump motor starts to work or not, and is judged by whether the pressure of hydraulic oil rises or not; the external energy storage output refers to whether a control output exists in a hydraulic system of the speed regulator or not, and is judged by whether the opening degree of a guide vane of the water turbine is changed or not; the loss degree of the energy storage energy of the hydraulic system is represented by the pressure value reduction rate of the hydraulic oil;
the leakage detection method comprises the following steps:
S1, setting a flow starting time interval T, judging whether a current flow starting time T arrives, and entering a judging program for judging whether the oil pump motor of the oil regulator is started recently after the current flow starting time T arrives;
S2, if the oil pump motor of the oil regulator is not started recently, entering a judging program for controlling whether the oil pump motor of the oil regulator is output recently or not;
S3, the hydraulic system of the speed regulator controls no output recently, whether the difference between the hydraulic oil pressure value of the last process and the hydraulic oil pressure value of the current process/the hydraulic oil pressure value of the current process is larger than the pressure value reduction rate or not is judged, and if the difference is larger than the pressure value reduction rate, the process execution continuously meets the condition times +1.
Preferably, the setting procedure starts the time interval T, so as to eliminate calculation interference caused by instantaneous jitter of the real-time pressure value of the hydraulic system.
Preferably, in the leakage detection method, the setting of the flow execution continuous meeting condition times criterion N is more than or equal to 2, and the occurrence of the leakage of the hydraulic system is further confirmed through the continuity of the pressure drop of the hydraulic oil.
Compared with the prior art, the invention has the beneficial effects that: according to the leakage detection method for the hydraulic system of the hydraulic turbine speed regulator, the intermittent action characteristic of the hydraulic system of the speed regulator is fully utilized, the silence time of the hydraulic system can reach more than 90%, namely, the oil pump motor is not started and the hydraulic system is not controlled to be output, so that whether the hydraulic system of the speed regulator has leakage or not can be detected on line in real time, and the blank is filled;
the leakage detection method for the hydraulic system of the hydraulic turbine speed regulator can detect the leakage degree of the hydraulic system of the speed regulator in real time: η/T, provide decision basis for whether to stop and overhaul;
according to the leakage detection method for the hydraulic system of the hydraulic turbine speed regulator, the sensors of the hydraulic system of the speed regulator are fully utilized for online detection, no additional detection equipment is needed, and no intentional shutdown detection is needed;
according to the leakage detection method for the hydraulic system of the hydraulic turbine speed regulator, the flow starting time interval T is set, and calculation interference caused by instantaneous jitter of a real-time pressure value of the hydraulic system is eliminated;
According to the hydraulic system leakage detection method of the hydraulic turbine speed regulator, the continuous meeting of the condition frequency criterion N is more than or equal to 2, the occurrence of the hydraulic system leakage is further confirmed through the continuity of the pressure drop of hydraulic oil, and erroneous judgment is avoided.
Drawings
FIG. 1 is a schematic diagram of the flow chart of a hydraulic system leakage detection method for a hydraulic turbine governor according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, the present invention provides a technical solution: the leakage detection method is used for monitoring the self-loss condition of the hydraulic system of the hydraulic turbine speed regulator in a period of time when the hydraulic system of the speed regulator has no external energy storage input and output, wherein the external energy storage input refers to whether an oil pump motor starts to work or not, and is judged by whether the pressure of hydraulic oil rises or not; the external energy storage output refers to whether a control output exists in a hydraulic system of the speed regulator or not, and is judged by whether the opening degree of a guide vane of the water turbine is changed or not; the loss degree of the energy storage energy of the hydraulic system is represented by the pressure value reduction rate of the hydraulic oil;
The leak detection method comprises the following steps:
S1, setting a flow starting time interval T, judging whether a current flow starting time T arrives, and entering a judging program for judging whether the oil pump motor of the oil regulator is started recently after the current flow starting time T arrives;
S2, if the oil pump motor of the oil regulator is not started recently, entering a judging program for controlling whether the oil pump motor of the oil regulator is output recently or not;
s3, the hydraulic system of the speed regulator controls no output recently, whether the difference between the hydraulic oil pressure value of the last process and the hydraulic oil pressure value of the current process/the hydraulic oil pressure value of the current process is larger than the pressure value reduction rate or not is judged, and if the difference is larger than the pressure value reduction rate, the process execution continuously meets the condition times +1;
Setting a flow starting time interval T for eliminating calculation interference caused by instantaneous jitter of a real-time pressure value of a hydraulic system;
The method for detecting leakage is characterized in that the establishment of the number of times of continuously meeting the condition criterion N is more than or equal to 2 is carried out by further confirming the occurrence of leakage of the hydraulic system through the continuity of pressure drop of hydraulic oil, so that misjudgment is avoided, the sensors of the hydraulic system of the speed regulator are fully utilized for online detection, no additional detection equipment is needed, no intentional shutdown detection is needed, the leakage degree eta/T of the hydraulic system of the speed regulator can be detected in real time, and a decision basis is provided for shutdown maintenance or not; the intermittent action characteristic of the hydraulic system of the speed regulator is fully utilized, whether leakage exists in the hydraulic system of the speed regulator can be detected on line in real time, and the blank is filled.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (2)
1. A hydraulic system leakage detection method of a hydraulic turbine governor is characterized by comprising the following steps of: the leakage detection method is used for monitoring the self-loss condition of the energy storage capacity of the speed regulator hydraulic system in a period of time when the external energy storage input and the external energy storage output are not available, wherein the external energy storage input refers to whether the oil pump motor starts to work or not, and the leakage detection method is judged by whether the pressure of hydraulic oil rises or not; the external energy storage output refers to whether a control output exists in a hydraulic system of the speed regulator or not, and is judged by whether the opening degree of a guide vane of the water turbine is changed or not; the loss degree of the energy storage energy of the hydraulic system is represented by the pressure value reduction rate of the hydraulic oil;
the leakage detection method comprises the following steps:
S1, setting a flow starting time interval T, judging whether a current flow starting time T arrives, and entering a judging program for judging whether the oil pump motor of the oil regulator is started recently after the current flow starting time T arrives;
S2, if the oil pump motor of the oil regulator is not started recently, entering a judging program for controlling whether the oil pump motor of the oil regulator is output recently or not;
s3, the hydraulic system of the speed regulator controls no output recently, whether the difference between the hydraulic oil pressure value of the last process and the hydraulic oil pressure value of the current process/the hydraulic oil pressure value of the current process is larger than the pressure value reduction rate or not is judged, and if the difference is larger than the pressure value reduction rate, the process execution continuously meets the condition times +1;
According to the leakage detection method, the continuous meeting of the condition times criterion N is more than or equal to 2, and the occurrence of leakage of the hydraulic system is further confirmed through the continuity of the pressure drop of the hydraulic oil.
2. The method for detecting leakage of a hydraulic system of a speed regulator of a water turbine according to claim 1, wherein: the set flow starts a time interval T for eliminating calculation interference caused by instantaneous jitter of a real-time pressure value of the hydraulic system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011620147.2A CN113418663B (en) | 2020-12-31 | 2020-12-31 | Leakage detection method for hydraulic system of hydraulic turbine governor |
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| CN202011620147.2A CN113418663B (en) | 2020-12-31 | 2020-12-31 | Leakage detection method for hydraulic system of hydraulic turbine governor |
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| CN113418663A CN113418663A (en) | 2021-09-21 |
| CN113418663B true CN113418663B (en) | 2024-05-03 |
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| CN102636321A (en) * | 2012-04-12 | 2012-08-15 | 三一重型装备有限公司 | Leakage diagnostic system and method of hydraulic bracket as well as hydraulic bracket |
| CN103452746A (en) * | 2013-07-31 | 2013-12-18 | 国家电网公司 | Hydraulic turbine governor out-of-control signal diagnosis and control methods |
| CN104204544A (en) * | 2012-03-22 | 2014-12-10 | 卡特彼勒公司 | Hydraulic accumulator pre-charge pressure detection |
| CN104791187A (en) * | 2015-04-08 | 2015-07-22 | 武汉四创自动控制技术有限责任公司 | Water-turbine adjustment system and method capable of forecasting health status |
| CN110696804A (en) * | 2019-11-14 | 2020-01-17 | 中车株洲电力机车有限公司 | Leakage detection method and device for brake system |
| CN111521328A (en) * | 2020-05-30 | 2020-08-11 | 华能澜沧江水电股份有限公司 | Method for detecting leakage fault of hydraulic system of speed regulator of generator set |
| CN111536104A (en) * | 2020-05-18 | 2020-08-14 | 湖北汽车工业学院 | Cab suspension hydraulic seal detection system and method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015153731A1 (en) * | 2014-04-02 | 2015-10-08 | Sikorsky Aircraft Corporation | System and method for health monitoring of hydraulic systems |
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- 2020-12-31 CN CN202011620147.2A patent/CN113418663B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104204544A (en) * | 2012-03-22 | 2014-12-10 | 卡特彼勒公司 | Hydraulic accumulator pre-charge pressure detection |
| CN102636321A (en) * | 2012-04-12 | 2012-08-15 | 三一重型装备有限公司 | Leakage diagnostic system and method of hydraulic bracket as well as hydraulic bracket |
| CN103452746A (en) * | 2013-07-31 | 2013-12-18 | 国家电网公司 | Hydraulic turbine governor out-of-control signal diagnosis and control methods |
| CN104791187A (en) * | 2015-04-08 | 2015-07-22 | 武汉四创自动控制技术有限责任公司 | Water-turbine adjustment system and method capable of forecasting health status |
| CN110696804A (en) * | 2019-11-14 | 2020-01-17 | 中车株洲电力机车有限公司 | Leakage detection method and device for brake system |
| CN111536104A (en) * | 2020-05-18 | 2020-08-14 | 湖北汽车工业学院 | Cab suspension hydraulic seal detection system and method |
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