CN115342101A - Hydraulic system internal leakage detection method and system for hydraulic generator speed regulator - Google Patents
Hydraulic system internal leakage detection method and system for hydraulic generator speed regulator Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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Abstract
The invention relates to a hydraulic system internal leakage detection method and system for a hydraulic governor of a hydraulic generator. The method can accurately calculate the internal leakage of the hydraulic system of the speed regulator under the running state of the hydraulic generator, and is really effective, accurate and reliable.
Description
Technical Field
The invention belongs to the field of fault detection of auxiliary equipment of a generator, and particularly relates to a method and a system for detecting internal leakage of a hydraulic system of a speed regulator of a hydraulic generator.
Background
The speed regulator of the hydraulic generator controls the water inflow of the hydraulic generator by adjusting the opening of the guide vane, thereby achieving the aim of adjusting the frequency and the load of the unit. The hydraulic system provides operating pressure to the governor and the pressure conducting medium is typically turbine oil.
An increase in the governor hydraulic system is a common equipment failure in hydroelectric power plants. The factors causing the increase of the internal leakage of the turbine oil of the hydraulic system of the hydraulic governor of the hydraulic generator mainly comprise:
1) The leakage is caused by the damage of the valve seal of the oil tank of the speed regulator;
2) The pipeline joint of the speed regulator leaks;
3) The main pressure distributing valve of the speed regulator causes leakage due to abrasion and other reasons;
4) The inner cavity of the speed governor servomotor is communicated with oil.
The method for calculating the internal leakage of turbine oil of the hydraulic system of the existing hydraulic generator set speed regulator generally comprises the following steps:
1) Judging whether leakage exists or not through the change times of the start-stop frequency of the oil pump;
2) Judging whether leakage positions or abnormal sounds exist or not through inspection tour so as to judge whether internal leakage exists or not;
3) And during maintenance, the pressure of the pipeline is used for checking whether the internal leakage exists or not.
The above method does not fully consider the influence caused by load adjustment, frequency adjustment and air leakage of the hydraulic system, and mainly has the following problems:
1) During the running of the generator, the unit participates in primary frequency modulation or load adjustment, displacement change of a speed regulator servomotor is caused, oil consumption is increased, an oil pump of the speed regulator is frequently started, and the oil quantity change does not belong to internal leakage of the speed regulator caused by leakage and oil leakage.
2) Oil tank gas leakage will cause the oil pump to start frequently, and hydraulic system seepage, servomotor cavity cluster oil cause, can't judge hydraulic system whether have the trouble through oil pump start-stop number of times only.
3) The traditional method cannot quantitatively analyze the internal leakage amount.
Disclosure of Invention
In order to solve the problems, such as the factors causing the increase of the internal leakage of the hydraulic system of the hydraulic generator and the defects and shortcomings of the existing method for detecting the internal leakage of the hydraulic system of the speed regulator of the hydraulic generator set, the invention provides a method and a system for detecting the internal leakage of the hydraulic system of the speed regulator of the hydraulic generator set, which are used for calculating the internal leakage of the hydraulic system of the speed regulator under the running state of the hydraulic generator set.
The invention analyzes the data of servomotor stroke, oil level of oil tank of speed regulator and the like related to the operation of the speed regulator in the historical database of the monitoring system continuously or by intercepting the data to obtain the actual oil consumption, and compares and analyzes the actual oil consumption and the theoretical oil consumption to judge whether the leakage in the hydraulic system of the speed regulator is increased or not, thereby providing a basis for accurately judging the fault of the speed regulator system.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for detecting internal leakage of a hydraulic system of a hydraulic governor of a hydraulic generator includes the steps of collecting data related to the operation of the governor in a historical database of a monitoring system, analyzing, calculating actual oil consumption, comparing and analyzing the actual oil consumption and theoretical oil consumption, judging whether the internal leakage of the hydraulic system of the governor is increased or not, and further accurately judging faults of the hydraulic system of the governor.
Further, the calculation process is as follows:
hydraulic system of calculating speed regulator at T a To T b Time interval actual oil consumption Q c ；
Hydraulic system of calculating speed regulator at T a To T b Time interval base oil consumption Q 0 ；
Hydraulic system of calculating speed regulator at T a To T b Oil consumption Q caused by primary frequency modulation or load adjustment of unit in time interval 1 ；
Calculating the internal leakage Q = Q of the speed regulator hydraulic system c -Q 0 -Q 1 ；
Calculating an alarm value, i.e. calculating the hydraulic system of the governor at T a To T b The leakage rate in the time period is as follows:
make alarm judgment, Q avg Less than r, indicating a small internal leakage, Q avg Greater than r indicates a large internal leakage.
Further, the governor hydraulic system is calculated at T a To T b Actual oil consumption in time period Q c The specific process is as follows:
calculating the time interval T of the speed governor a To T b Pressure oil tank oil level variation L c Wherein, T a To T b The time interval comprises n complete intervals, the initial value of each interval is the highest oil level corresponding to the oil pump of the hydraulic system of the speed regulator when the oil pump stops, and the final value of each interval is the lowest oil level corresponding to the oil pump of the hydraulic system of the speed regulator when the oil pump starts;
calculating the apparent sectional area of the oil tank: s. the 1 ＝πR 2 ；
Governor hydraulic system at T a To T b Time intervalThe fuel consumption is reduced.
Further, the hydraulic system of the calculating speed regulator is T a To T b Time interval base oil consumption Q 0 The specific process is as follows:
acquiring the basic oil consumption rate V of the unit in the initial shutdown state after production or overhaul i ；
Calculating the conversion of the oil level of the oil tank of the governor to T a To T b Base fuel consumption height of time period:
hydraulic system of calculating speed regulator at T a To T b Time interval base fuel consumption:
Q 0 ＝L 0 S 1 。
further, the governor hydraulic system is calculated at T a To T b Oil consumption Q caused by primary frequency modulation or load adjustment of unit in time interval 1 The method comprises the following steps:
calculating the displacement L of the guide vane 1 The method comprises the following steps:
calculating the sectional area S of rod cavity of speed regulator servomotor 2 Section area S of rodless cavity of speed governor servomotor 3 ；
Calculating governor system at T a To T b Time interval unit frequency modulation oil consumption Q 1 ＝L 1 (S 2 +S 3 )。
The invention also relates to an internal leakage detection system of the hydraulic system of the speed regulator of the hydraulic generator, which comprises an oil level measuring sensor arranged in the pressure oil tank and a displacement sensor arranged at the servomotor of the speed regulator, wherein the measured stroke is the linear displacement of the servomotor;
the collector is used for collecting the data of the sensor and the historical database data of the power station monitoring system; and the processor performs internal leakage detection according to the method.
Further, the system also comprises an alarm module, and when the internal leakage amount is large, the processor sends an instruction to the alarm module to alarm.
The invention also relates to an electronic device comprising a memory, a processor and a computer program running on the memory and on the processor, wherein the processor implements the steps of the method when executing the computer program.
The invention also relates to a non-transitory computer-readable storage medium having stored thereon a computer program which, when executed by a processor, carries out the steps of the above-mentioned method.
The formula involved in the above scheme is as follows:
wherein:
q is calculated quantity of internal leakage of a hydraulic system of the speed regulator, and the unit is m3;
Q c for governor hydraulic systems at T a To T b Actual fuel consumption in time interval, unit m3;
Q 0 for governor hydraulic systems at T a To T b The time interval base oil consumption, which reflects the equivalent oil consumption of the governor hydraulic system when the governor hydraulic system does not participate in regulation, is m3;
Q 1 for governor hydraulic systems at T a To T b The unit m3 is the oil consumption caused by the primary frequency modulation or load adjustment of the unit in the time interval;
Q avg for governor hydraulic systems at T a To T b The internal leakage rate of the time period is expressed in L/m (minutes).
T a In order to count the initial time of the internal leakage of the hydraulic system, the pump stopping time of an oil pump of a certain speed regulator during the power generation operation of the generator set is generally selected.
T b In order to count the termination time of the internal leakage of the hydraulic system, the pump starting time of a certain speed regulator oil pump during the power generation operation of the generator set is generally selected.
L c Is a unit T a To T b The governor pressure tank oil level varies by an amount m (note: when the tank oil level drops to the pump-up pressure, the oil pump will perform an oil replenishment operation, so the integral value is divided by 2 as the actual variation).
S 1 The cross-sectional area of the oil tank of the speed governor is viewed from the top, and the square meter is a unit.
f' (l) is the rate of change of the governor pressure tank oil level during the generating operation of the unit, which is negative when the oil level decreases and positive when the oil level increases. Absolute values of f' (l) are used to reflect the absolute change in oil level in m/s.
V i The parameter reflects the original internal leakage condition of the hydraulic system of the speed regulator for the basic oil consumption rate of the ith statistical interval of the hydraulic system of the speed regulator during the shutdown period, and the calculation is carried out in the shutdown state after the unit is overhauled, wherein the unit is m/s.
L i0 For the ith statistical interval T of a speed regulator hydraulic system during shutdown i Height of descent in time period, unit m.
T i For the i statistical interval drop L of a speed regulator hydraulic system during the shutdown i0 The time used is in units of s.
L 0 For converting the oil level of the oil tank of the speed governor to T a To T b Base fuel consumption height of the time period, in m.
n 0 The quantity of samples for the basis leakage rate of the hydraulic system of the speed regulator in the shutdown state of the unit is selected.
L 1 Is at T a To T b The displacement of the guide vane in the period is m.
y is the displacement change rate of the guide vane, the parameter is provided by a displacement sensor of the speed regulator servomotor, the parameter reflects the linear change distance of the speed regulator servomotor, and is positive, the guide vane is towards the opening direction, and is negative, and the guide vane runs towards the closing direction. As long as the guide vane displacement occurs, turbine oil will be consumed, and the solid rate of change takes the absolute value in m/s.
S 2 The speed regulator servomotor has a rod cavity with a sectional area of square meter.
S 3 The section area of a rodless cavity of the speed regulator servomotor is square meter.
r is a deterioration coefficient, which is determined from the actual condition of each plant and has a unit of L/m (minutes).
The speed regulator hydraulic system is the core equipment of hydroelectric set, and along with the increase of operation age, hydraulic system receives factors such as metalwork wearing and tearing and sealed ageing influence, and interior discharge will progressively increase.
Compared with the prior art, the method provided by the invention has the following beneficial effects:
(1) The method comprehensively considers the internal leakage of the hydraulic system and the influence of primary frequency modulation and load adjustment of the unit in the calculation, provides more accurate internal leakage, and provides a judgment basis for the degradation degree and the development trend;
(2) The invention can be effectively applied to the high-utilization-hour unit, realizes the quantitative analysis of the internal leakage of the speed regulator under the condition that the unit does not shut down, and provides a basis for whether the unit needs to shut down to deal with the faults of the types listed in the invention; and through quantitative data analysis, a basis is provided for the state analysis of the unit.
(3) The invention can be widely applied to the condition maintenance, intelligent analysis and big data analysis of the unit.
Drawings
Fig. 1 is a block diagram of a system according to an embodiment of the present invention;
fig. 2 is a flow chart of a method according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person skilled in the art based on the embodiments without making any creative efforts shall fall within the protection scope of the present application.
Unless defined otherwise, technical or scientific terms used in the embodiments of the present application should have the ordinary meaning as understood by those having ordinary skill in the art. The use of "first," "second," and similar words in this embodiment does not denote any order, quantity, or importance, but rather the terms "first," "second," and the like are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. "mounted," "connected," and "coupled" are to be construed broadly and may, for example, be fixedly coupled, detachably coupled, or integrally coupled; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. "Upper," "lower," "left," "right," "lateral," "vertical," and the like are used solely in relation to the orientation of the components in the figures, and these directional terms are relative terms that are used for descriptive and clarity purposes and that can vary accordingly depending on the orientation in which the components in the figures are placed.
Example 1
The internal leakage detection system of the hydraulic system of the speed regulator of the hydraulic generator comprises an oil level measuring sensor arranged in a pressure oil tank and a displacement sensor arranged at a servomotor of the speed regulator, wherein the measured stroke is linear displacement of the servomotor;
the collector is used for collecting the data of the sensor and the historical database data of the power station monitoring system; and the processor is used for performing internal leakage detection according to the data acquired by the acquisition device.
And when the internal leakage amount is large, the processor sends an instruction to the alarm module to alarm.
And a display for displaying the collected data, the processing process and the result, as shown in fig. 1.
It should be noted that the division of the modules of the above apparatus is only a logical division, and the actual implementation may be wholly or partially integrated into one physical entity, or may be physically separated. And these modules can be realized in the form of software called by processing element; or may be implemented entirely in hardware; and part of the modules can be realized in the form of calling software by the processing element, and part of the modules can be realized in the form of hardware.
In the above embodiments, all or part of the implementation may be realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a readable storage medium or transmitted from one readable storage medium to another readable storage medium, for example, the computer instructions may be transmitted from one website site, computer, server, or data center to another website site, computer, server, or data center by wire or wirelessly. The readable storage medium may be any available medium that can be accessed by a computer or a data storage device including one or more available media integrated servers, data centers, and the like. The usable medium may be a magnetic medium, an optical medium, a semiconductor medium, or the like.
Optionally, an embodiment of the present application further provides a storage medium, where instructions are stored, and when the storage medium is run on a computer, the storage medium causes the computer to execute the method according to the embodiment described above.
Optionally, an embodiment of the present application further provides a chip for executing the instruction, where the chip is configured to execute the method in the foregoing illustrated embodiment.
The embodiments of the present application also provide a program product, where the program product includes a computer program, where the computer program is stored in a storage medium, and at least one processor can read the computer program from the storage medium, and when the at least one processor executes the computer program, the at least one processor can implement the method of the above-mentioned embodiments.
As shown in fig. 2, the method for detecting internal leakage of hydraulic system of hydraulic governor of hydraulic generator in this embodiment.
Take the speed regulator hydraulic system of No. 5 hydraulic generator in a certain power plant as an example, carry out actual detection. The hydraulic system of the hydraulic generator speed regulator mainly comprises a speed regulator oil tank and auxiliary equipment thereof, a speed regulator servomotor and auxiliary equipment thereof, and automatic control equipment for the opening of guide vanes of the speed regulator.
Description of the related cases:
1) The pressure oil tank is provided with an oil level measuring sensor;
2) The displacement sensor is arranged at the servomotor of the speed regulator, and the measured stroke is linear displacement of the servomotor;
3) All data is from the power station monitoring system historical database.
The method of the embodiment mainly comprises the following steps:
(1) Governor hydraulic system at T a To T b Time interval actual oil consumption Q c And (4) calculating.
Speed regulator pressure oil tank oil level variable L c And (4) calculating.
In this example, constrained by the sensor measurement principle, | f' (l) | cannot be read directly,
l is needed to be aligned in calculation c The measurement and calculation formula (2) is put into practical use.
The method comprises the following specific steps:
description of the formula: selecting No. 5 generator power generation operation time period T a To T b Where the period includes 10 complete "pump off-pump on" cycles, there are 10 complete cycles of "highest oil level-lowest oil level", as shown in the table below.
TABLE 1
| Data group classification | Potential difference of oil (m) | Data group classification | Oil level difference (m) |
| 1 | 0.04630 | 6 | 0.04490 |
| 2 | 0.04540 | 7 | 0.04465 |
| 3 | 0.04880 | 8 | 0.04700 |
| 4 | 0.04385 | 9 | 0.04865 |
| 5 | 0.04520 | 10 | 0.04435 |
Calculated from table 1, lc =0.4591m.
The above values correspond to the time difference: t is a unit of b -T a ＝21467s。
Apparent sectional area of the oil tank: s 1 ＝πR 2 ＝3.14×0.5 2 ＝0.785㎡。
Governor hydraulic system at T a To T b Actual oil consumption in a time period:
Q c ＝L c S1＝0.4591×0.785＝0.3604m3。
(2) Governor hydraulic system at T a To T b Time interval base oil consumption Q 0 And (4) calculating.
Base oil consumption rate V in shutdown state i The following table shows.
TABLE 2
| Data group classification | Oil level variation L i0 (m) | Corresponding time difference T i (s) | Basal leakage Rate (10) -6 m/s) |
| 1 | 0.04545 | 10077 | 4.5103 |
| 2 | 0.04965 | 10748 | 4.6195 |
| 3 | 0.04965 | 10808 | 4.5938 |
| 4 | 0.04705 | 11282 | 4.1704 |
Conversion of oil level of oil tank to T for speed regulator a To T b Base fuel consumption height for the period:
governor hydraulic system at T a To T b Time interval base oil consumption:
Q 0 ＝L 0 S 1 ＝0.0961×0.785＝0.0754m 3
(3) Governor hydraulic system at T a To T b Oil consumption Q caused by primary frequency modulation or load adjustment of unit in time interval 1 And (4) calculating.
Displacement L of guide vane 1 And (4) calculating.
In this embodiment, it is considered that the displacement change rate | y | cannot be directly read, and a theoretical formula needs to be optimized, which is specifically as follows:
description of the formula: in actual calculation, T is added a To T b The data of the period is divided into K continuous intervals, the difference between the final value and the initial value of each interval is the integral value of the interval, all the values of the K intervals are added, and the guide vane displacement accumulated change amount of the interval is obtained. The larger the K value, L 1 The higher the accuracy, in the example calculation process, a calculation dead zone is required to be set for reducing the accumulated error brought by the sampling error of the sensor.
As shown in the following table (the data size is large, only a part of the data is shown by interception).
TABLE 3
Calculating L from Table 3 1 ＝1.868m。
Sectional area S of rod cavity of speed regulator servomotor 2 ＝0.0962㎡。
Section area S of rodless cavity of speed regulator servomotor 3 ＝0.0452㎡。
Governor system at T a To T b Time interval unit frequency modulation oil consumption:
Q 1 ＝L 1 (S 2 +S 3 )＝1.868×(0.0962+0.0452)＝0.2641m 3
(4) The calculated amount Q of internal leakage of a speed regulator hydraulic system is as follows:
Q＝Q c -Q 0 -Q 1 ＝0.3604-0.0754-0.2641＝0.0209m 3 。
(5) And calculating an alarm value. Governor hydraulic system at T a To T b And (5) calculating the leakage rate in the time period.
(6) Alarm criterion calculation (r value is 0.5L/m)
Q avg ＜＜r；
Q avg Far less than r, the internal leakage is very small. And (4) checking the speed regulator system of the No. 5 unit, and finding no obvious leakage or oil leakage position, wherein the calculation result is consistent with the actual condition.
Example 2
The system of this example is similar to example 1.
In the embodiment, the speed regulator hydraulic system of the No. 1 hydraulic generator of a certain power plant is taken as an example to carry out actual detection. The hydraulic system of the speed regulator of the hydraulic generator mainly comprises a speed regulator oil tank and accessory equipment thereof, a speed regulator servomotor and accessory equipment thereof, and automatic control equipment for the opening degree of guide vanes of the speed regulator.
Description of the related cases:
1) The pressure oil tank is provided with an oil level measuring sensor;
2) The displacement sensor is arranged at the servomotor of the speed regulator, and the measured stroke is linear displacement of the servomotor;
3) All data comes from the power station monitoring system historical database.
The method of the embodiment mainly comprises the following steps:
(1) Governor hydraulic system at T a To T b Actual oil consumption in time period Q c And (4) calculating.
Speed regulator pressure oil tank oil level variable L c And (4) calculating.
In this example, constrained by the sensor measurement principle, | f' (L) | cannot be read directly, and L is required to be calculated c The measurement formula is optimized. The method comprises the following specific steps:
description of the formula: selecting the power generation operation time period T of No. 5 generator a To T b Where the period includes 10 complete "pump off-pump on" cycles, there are 10 complete cycles of "highest oil level-lowest oil level", as shown in the table below.
TABLE 4
Calculated from table 4, lc =0.6520m.
The above values correspond to time differences: t is a unit of b -T a ＝9770s。
Apparent sectional area of the oil tank: s 1 ＝πR 2 ＝3.14×0.5 2 ＝0.785㎡。
Governor hydraulic system at T a To T b Actual oil consumption in a time period:
Q c ＝L c S1＝0.6520×0.785＝0.5118m3。
(2) Governor hydraulic system at T a To T b Time interval base oil consumption Q 0 And (4) calculating.
Base oil consumption rate V in shutdown state i The following table shows.
TABLE 5
| Data group classification | Oil level variation L i0 (m) | Corresponding time difference T i (s) | Basal leakage Rate (10) -5 m/s) |
| 1 | 0.04425 | 1096 | 4.0374 |
| 2 | 0.04335 | 1098 | 3.9481 |
| 3 | 0.04315 | 1080 | 3.9954 |
| 4 | 0.04420 | 997 | 4.4333 |
| 5 | 0.04395 | 1063 | 4.1345 |
| 6 | 0.04300 | 1091 | 3.9413 |
| 7 | 0.04340 | 1064 | 4.0790 |
| 8 | 0.04355 | 1104 | 3.9448 |
| 9 | 0.04390 | 1003 | 4.3769 |
| 10 | 0.04395 | 1090 | 4.0321 |
Conversion of oil level of oil tank to T for speed regulator a To T b Base fuel consumption height for the period:
governor hydraulic system at T a To T b Time interval base fuel consumption:
Q 0 ＝L 0 S 1 ＝0.3998×0.785＝0.3139m 3
(3) Governor hydraulic system at T a To T b Oil consumption Q caused by primary frequency modulation or load adjustment of unit in time interval 1 And (4) calculating.
Displacement L of guide vane 1 Computing
In this example, considering that the displacement change rate | y | cannot be directly read, a theoretical formula needs to be optimized, which is specifically as follows:
description of the formula: in actual calculation, T is added a To T b The data of the period is divided into K continuous intervals, the difference between the final value and the initial value of each interval is the integral value of the interval, all the values of the K intervals are added, and the guide vane displacement accumulated change amount of the interval is obtained.
The larger the K value, L 1 The higher the accuracy is, in the example calculation process, a calculation dead zone is required to be set for reducing the accumulated error caused by the sampling error of the sensor. As shown in the following table (the data size is large, only a part of the data is shown by interception).
TABLE 6
| 2022/6/15 0:24 | 238.825 | 1.438 | 1.438 |
| 2022/6/15 0:25 | 237.231 | 1.594 | 1.594 |
| 2022/6/15 0:25 | 239.418 | 2.187 | 2.187 |
| 2022/6/15 0:25 | 238.075 | 1.343 | 1.343 |
| 2022/6/15 0:32 | 240.075 | 2 | 2 |
| 2022/6/15 0:33 | 238.668 | 1.407 | 1.407 |
| 2022/6/15 0:33 | 237.45 | 1.218 | 1.218 |
| 2022/6/15 0:37 | 238.731 | 1.281 | 1.281 |
| 2022/6/15 0:40 | 237.231 | 1.5 | 1.5 |
| 2022/6/15 0:41 | 238.481 | 1.25 | 1.25 |
| 2022/6/15 0:46 | 240.137 | 1.656 | 1.656 |
| 2022/6/15 0:46 | 238.012 | 2.125 | 2.125 |
| 2022/6/15 0:48 | 239.043 | 1.031 | 1.031 |
| 2022/6/15 0:48 | 237.918 | 1.125 | 1.125 |
| 2022/6/15 0:52 | 238.418 | 0.5 | 0.5 |
| 2022/6/15 0:55 | 239.45 | 1.032 | 1.032 |
| 2022/6/15 0:58 | 238.2 | 1.25 | 1.25 |
| 2022/6/15 1:00 | 239.481 | 1.281 | 1.281 |
| 2022/6/15 1:00 | 240.575 | 1.094 | 1.094 |
| 2022/6/15 1:01 | 239.356 | 1.219 | 1.219 |
| 2022/6/15 1:07 | 239.043 | 0.313 | 0 |
| 2022/6/15 1:11 | 237.887 | 1.156 | 1.156 |
| 2022/6/15 1:12 | 242.481 | 4.594 | 4.594 |
| 2022/6/15 1:12 | 238.512 | 3.969 | 3.969 |
| 2022/6/15 1:22 | 236.387 | 2.125 | 2.125 |
| ... | ... | ... | ... |
| 2022/6/15 3:22 | 244.418 | 0.218 | 0 |
L is calculated from Table 6 1 ＝0.1032m。
Sectional area S of rod cavity of speed regulator servomotor 2 ＝0.0962㎡。
Section area S of rodless cavity of speed regulator servomotor 3 ＝0.0452㎡。
Governor system at T a To T b Time interval unit frequency modulation oil consumption:
Q 1 ＝L 1 (S 2 +S 3 )＝0.1032×(0.0962+0.0452)＝0.0146m 3
(4) The calculated amount Q of internal leakage of a speed regulator hydraulic system is as follows:
Q＝Q c -Q 0 -Q 1 ＝0.5118-0.3139-0.0146＝0.1833m 3
(5) And calculating an alarm value. Governor hydraulic system at T a To T b And (5) calculating the leakage rate in the time period.
(6) And calculating an alarm criterion (r takes a value of 0.5).
Q avg ＞r；
Q avg Is obviously larger than r, and the internal leakage is larger. When the unit is in operation, the speed regulator system of the No. 1 unit is checked, the fact that an oil return pipeline of the speed regulator system has obvious internal leakage return oil is found, the internal leakage return oil belongs to the internal leakage cause of a main pressure distribution valve through analysis, and a calculation result is in accordance with the actual situation.
Therefore, the method can accurately calculate the internal leakage of the hydraulic system of the speed regulator under the running state of the hydraulic generator, and is really effective, accurate and reliable.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.
Claims (9)
1. The internal leakage detection method of the hydraulic system of the hydraulic generator speed regulator is characterized by comprising the following steps of: collecting data related to the operation of the speed regulator in a historical database of the monitoring system, analyzing and calculating the actual oil consumption, comparing and analyzing the actual oil consumption with the theoretical oil consumption, judging whether the internal leakage of a hydraulic system of the speed regulator is increased or not, and further accurately judging the fault of the speed regulator system.
2. The method of claim 1, wherein: the calculation process is as follows:
hydraulic system of calculating speed regulator at T a To T b Time interval actual oil consumption Q c ；
Hydraulic system of calculating speed regulator at T a To T b Time interval base oil consumption Q 0 ；
Hydraulic system of calculating speed regulator at T a To T b Oil consumption Q caused by primary frequency modulation or load adjustment of unit in time interval 1 ；
Calculating the internal leakage Q = Q of the speed regulator hydraulic system c -Q 0 -Q 1 ；
Calculating an alarm value, i.e. calculating the hydraulic system of the governor at T a To T b The leakage rate in the time period is as follows:
make an alarm judgment, Q avg Less than r, indicating a small internal leakage, Q avg Greater than r indicates a large internal leakage.
3. The method of claim 2, wherein: hydraulic system of calculating speed regulator at T a To T b Time interval actual oil consumption Q c The specific process comprises the following steps:
calculating the governor time period T a To T b Pressure oil tank oil level variation L c ：
Calculating the apparent sectional area of the oil tank: s 1 ＝πR 2 ；
Governor hydraulic system at T a To T b The actual fuel consumption of the time interval.
4. The method of claim 3, wherein: hydraulic system of calculating speed regulator at T a To T b Time interval base oil consumption Q 0 The specific process is as follows:
acquiring the basic oil consumption rate V of the unit in the initial shutdown state after production or overhaul i ；
Conversion of oil level of oil tank to T for calculating speed regulator a To T b Base fuel consumption height for the period:
hydraulic system of calculating speed regulator at T a To T b Time interval base oil consumption:
Q 0 ＝L 0 S 1 。
5. the method of claim 3, wherein: hydraulic system of calculating speed regulator at T a To T b Oil consumption Q caused by primary frequency modulation or load adjustment of unit in time interval 1 The method comprises the following steps:
calculating the displacement L of the guide vane 1 The method comprises the following steps:
calculating the sectional area S of rod cavity of speed regulator servomotor 2 Section area S of rodless cavity of speed governor servomotor 3 ；
Calculating governor system at T a To T b Time interval unit frequency modulation oil consumption Q 1 ＝L 1 (S 2 +S 3 )。
6. The utility model provides a hydraulic system of hydraulic generator speed regulator internal leakage detecting system which characterized in that: the oil level measuring device comprises an oil level measuring sensor arranged in a pressure oil tank and a displacement sensor arranged at a servomotor of a speed regulator, wherein the measured stroke is linear displacement of the servomotor;
the collector is used for collecting the data of the sensor and the historical database data of the power station monitoring system; processor for performing inner leakage detection according to the method of any of claims 1-5.
7. The system of claim 6, wherein: the system also comprises an alarm module, and when the internal leakage amount is large, the processor sends an instruction to the alarm module to alarm.
8. An electronic device comprising a memory, a processor, and a computer program that is executable on the memory and on the processor, wherein: the processor when executing the computer program realizes the steps of the method of any of the preceding claims 1 to 5.
9. A non-transitory computer-readable storage medium having stored thereon a computer program, characterized in that: the computer program, when being executed by a processor, realizes the steps of the method as claimed in any one of claims 1 to 5.
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| CN202210870538.2A CN115342101A (en) | 2022-07-23 | 2022-07-23 | Hydraulic system internal leakage detection method and system for hydraulic generator speed regulator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116221002A (en) * | 2023-01-04 | 2023-06-06 | 中国长江电力股份有限公司 | Oil-line oil-mixing judging method for switch cavity oil circuit of guide vane servomotor of large-scale hydroelectric generating set |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116221002A (en) * | 2023-01-04 | 2023-06-06 | 中国长江电力股份有限公司 | Oil-line oil-mixing judging method for switch cavity oil circuit of guide vane servomotor of large-scale hydroelectric generating set |
| CN116221002B (en) * | 2023-01-04 | 2024-01-02 | 中国长江电力股份有限公司 | Oil-line oil-mixing judging method for switch cavity oil circuit of guide vane servomotor of large-scale hydroelectric generating set |
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