CN118088367B - Method and device for protecting and alarming interruption of main shaft working sealing water of hydroelectric generating set - Google Patents
Method and device for protecting and alarming interruption of main shaft working sealing water of hydroelectric generating set Download PDFInfo
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- CN118088367B CN118088367B CN202410494500.9A CN202410494500A CN118088367B CN 118088367 B CN118088367 B CN 118088367B CN 202410494500 A CN202410494500 A CN 202410494500A CN 118088367 B CN118088367 B CN 118088367B
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- 238000007789 sealing Methods 0.000 title claims abstract description 163
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000012544 monitoring process Methods 0.000 claims abstract description 87
- 238000005065 mining Methods 0.000 claims abstract description 66
- 230000000630 rising effect Effects 0.000 claims description 31
- 238000000605 extraction Methods 0.000 claims 2
- 238000005070 sampling Methods 0.000 description 8
- 238000012423 maintenance Methods 0.000 description 7
- 230000011664 signaling Effects 0.000 description 4
- 238000005461 lubrication Methods 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/06—Indicating or recording devices
- G01F15/068—Indicating or recording devices with electrical means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B11/00—Parts or details not provided for in, or of interest apart from, the preceding groups, e.g. wear-protection couplings, between turbine and generator
- F03B11/006—Sealing arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B11/00—Parts or details not provided for in, or of interest apart from, the preceding groups, e.g. wear-protection couplings, between turbine and generator
- F03B11/008—Measuring or testing arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B15/00—Controlling
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/08—Means for indicating or recording, e.g. for remote indication
- G01L19/083—Means for indicating or recording, e.g. for remote indication electrical
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/08—Means for indicating or recording, e.g. for remote indication
- G01L19/12—Alarms or signals
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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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Hydraulic Turbines (AREA)
- Control Of Water Turbines (AREA)
Abstract
The invention discloses a method and a device for protecting and alarming a hydropower unit spindle working sealing water interruption stop, which relate to the field of hydraulic generators and are used for solving the problems of untimely interruption and misoperation of an accident stop. The invention compares the flow of the main sealing pipe of the monitoring direct mining main shaft with the low flow alarm value, and then the signal phase with the too low flow of the main sealing pipe of the monitoring direct mining main shaft; comparing the pressure of the main sealing pipe of the monitoring direct mining main shaft with the low pressure alarm value, then comparing the pressure of the main sealing pipe of the monitoring direct mining main shaft with the pressure of the main sealing pipe of the monitoring direct mining main shaft, comparing the pressure of the main sealing pipe of the monitoring direct mining main shaft with the pressure alarm value of the low pressure, comparing the result of the two times of the phase of the pressure of the main sealing pipe of the monitoring direct mining main shaft with the action signal of the LCU remote control model of the unit, the action signal of the main sealing system of the unit, the input signal of the main sealing stop soft pressing plate of the unit main shaft, the phase of the main sealing water interruption action signal of the main shaft, and then carrying out secondary delay error judgment on the output signal to obtain the stop sign signal. The invention can timely and accurately start the accident shutdown process, and greatly improves the reliability, safety and economy of the main shaft working sealing water interruption shutdown control.
Description
Technical Field
The invention relates to the field of hydraulic generators, in particular to a method and a device for protecting and alarming when working sealing water of a main shaft of a hydroelectric generating set is interrupted.
Background
The main shaft seal of the hydro-generator set is generally divided into a working seal and an overhaul seal, which are arranged below the hydraulic turbine guide bearing. The working seal mainly comprises a sliding ring, a sealing block, a floating ring, a supporting ring, an adjusting device and a water supply device; the maintenance seal is an air shroud seal and mainly comprises an air shroud, a maintenance seal seat and a gas supply and exhaust device. The maintenance seal switching is generally operated manually, and the maintenance seal switching can be put into use after the machine set is stopped or when needed, and the shroud ring is removed before the machine set rotates.
The main shaft working seal (main shaft seal) is generally provided with three water sources, the main water source is fire water, the standby water source is clean water and technical water supply of a unit, and the standby water source meets the use requirement after being pressurized by a booster pump. The main water source is provided with an independent electric valve control waterway, the two standby water sources share one electric valve control waterway, the front end of the electric valve is provided with a manual maintenance valve, and the inlet water enters the main shaft seal after passing through three main and standby redundant filters. In the prior art, the main shaft sealing water system is stopped by manual judgment mostly after the main shaft sealing water is interrupted, so that an automatic starting accident stopping flow cannot be realized, once the main shaft sealing water is interrupted, the continuous rising of the top cover water level is extremely likely to be caused, the risk of causing major electric safety accidents such as a water flooded factory building and the like exists, and major equipment loss and major casualties of personnel can be brought.
At present, judging shutdown logic is imperfect when the main shaft sealing lubrication water supply of a general hydropower station hydroturbine is interrupted, and misoperation of a main shaft sealing water interruption signal can be caused besides the fact that the main shaft sealing water interruption signal is not timely generated. The main shaft seal lubrication water supply interruption signal misoperation can cause the unplanned outage of the hydroelectric generating set, equipment damage possibly caused is caused, and meanwhile, the power grid unplanned outage assessment is carried out.
Therefore, how to ensure the timeliness and accuracy of the main shaft working sealing water interruption signal alarm is important to ensure the safe and stable operation of the hydroelectric generating set.
Disclosure of Invention
The invention aims at: aiming at all or part of the problems, the method and the device for protecting and alarming the interruption of the working sealing water of the main shaft of the hydroelectric generating set are provided, so that the problems of untimely and misoperation caused by the interruption signal of the working sealing water of the main shaft at present are solved.
The technical scheme adopted by the invention is as follows:
a water-break shutdown protection and alarm method for a main shaft working seal water of a hydroelectric generating set comprises the following steps:
during the running or standby of the hydroelectric generating set, collecting and monitoring the flow Q of the main shaft sealing main pipe, and comparing the flow Q with the configured low-flow alarm value Q1 to obtain a first comparison signal;
During the running or standby of the hydroelectric generating set, collecting and monitoring the sealing flow rate too low signal of the direct mining main shaft, and performing logical AND operation with the first comparison signal to obtain a flow rate state signal; the monitoring direct mining main shaft sealing flow rate too low signal indicates whether the monitoring direct mining main shaft sealing main pipe flow rate Q is lower than a configured flow rate too low action value Q2 or not;
During the running or standby of the hydroelectric generating set, collecting and monitoring the pressure P of the sealing main pipe of the direct mining main shaft, and comparing the pressure P with the configured low pressure alarm value P1 to obtain a second comparison signal;
During the running or standby of the hydroelectric generating set, collecting and monitoring the signal of the too low sealing pressure of the direct mining main shaft, and carrying out logical AND operation on the signal and the second comparison signal to obtain a pressure state signal; the monitoring direct mining main shaft sealing pressure too low signal indicates whether the monitoring direct mining main shaft sealing main pipe pressure P is lower than a configured pressure too low action value P2 or not;
During the running or standby of the hydroelectric generating set, respectively acquiring a set LCU remote control model action signal, a set main shaft sealing system remote control mode action signal, a set main shaft sealing stop soft pressing plate input signal and a main shaft sealing water interruption action signal; performing logical AND operation on the unit LCU remote control model action signal, the unit main shaft sealing system remote control mode action signal, the unit main shaft sealing stop soft pressing plate input signal, the main shaft sealing water interruption action signal, the flow state signal and the pressure state signal to obtain a first control signal;
And carrying out two-stage delay error judgment on the first control signal, taking an action signal obtained by the first-stage delay error judgment as a main shaft sealing water interruption alarm signal, and taking an action signal obtained by the second-stage delay error judgment as a shutdown mark signal to trigger the starting of an accident shutdown process.
Further, performing two-stage delay error judgment on the first control signal includes:
When the first-stage delay judgment is carried out, for each rising edge in the first control signal, if the time from the rising edge to the latest falling edge is within the first alarm delay T1, eliminating a high-level signal from the rising edge to the latest falling edge; if the time from the rising edge to the latest falling edge exceeds the first alarm delay time T1, the rising edge is moved backwards for the duration of the first alarm delay time T1; inputting the action signal obtained by the first-stage delay judgment into the second-stage delay judgment;
When the second-stage delay judgment is carried out, for each rising edge in the action signals obtained by the first-stage delay judgment, if the time from the rising edge to the latest falling edge is within the second alarm delay T2, eliminating the high-level signals from the rising edge to the latest falling edge; if the time from the rising edge to the latest falling edge exceeds the first alarm delay time T2, the rising edge is moved backwards by the duration of the first alarm delay time T2.
Further, the flow Q of the direct-mining main shaft sealing main pipe and/or the pressure P of the direct-mining main shaft sealing main pipe are/is monitored, and the monitoring and reporting is carried out through a4 mA-20 mA.DC signal system after the monitoring and the collecting.
Further, the low flow alarm value Q1 is 6m h.
Further, the low pressure alarm value P1 is 0.1MPa.
Further, the first alarm delay T1 is 120s plus or minus 10s, and the second alarm delay T2 is 45min plus or minus 5min.
Further, the collecting action of the monitoring direct-sampling main shaft sealing pressure too low signal is as follows: by configuring the flow rate too low action value Q2 on the flowmeter body arranged on the main shaft sealing main pipe, when the flow rate Q of the monitoring direct-mining main shaft sealing main pipe collected by the flowmeter is lower than the flow rate too low action value Q2, a passive node on the flowmeter outputs a monitoring direct-mining main shaft sealing pressure too low signal.
Further, the collecting action of the monitoring direct-sampling main shaft sealing pressure too low signal is as follows: by configuring the pressure too low action value P2 on the pressure switch arranged on the main shaft sealing main pipe, when the pressure P of the monitoring direct-mining main shaft sealing main pipe is lower than the pressure too low action value P2, a passive node on the pressure switch outputs a signal for monitoring the direct-mining main shaft sealing pressure too low.
Further, the flow rate too low action value Q2 is lower than the low flow rate alarm value Q1.
The main shaft working sealing water interruption shutdown protection alarm device of the hydroelectric generating set comprises a first comparator, a second comparator, a first AND gate, a second AND gate, a third AND gate, a first TON delay module and a second TON delay module; wherein:
The input pin of the first comparator is connected with the flow Q of the direct collection main shaft sealing main pipe, the reference pin of the first comparator is connected with the low flow alarm value Q1, the output pin of the first comparator is connected with one input pin of the first AND gate, and when the value of the input pin of the first comparator is lower than the value of the reference pin of the first comparator, the output pin of the first comparator outputs high level;
the first AND gate is connected with a signal for monitoring the too low flow of the direct mining main shaft seal through the other input pin; the output pin of the first AND gate is connected with one input pin of the third AND gate;
The input pin of the second comparator is connected with the pressure P of the direct-picking main shaft sealing main pipe, the reference pin of the second comparator is connected with a low-pressure alarm value P1, the output pin of the second comparator is connected with one input pin of the second AND gate, and when the value of the input pin of the second comparator is lower than the value of the reference pin of the second comparator, the output pin of the second comparator outputs a high level;
The second AND gate is connected with a signal for monitoring the too low sealing pressure of the direct mining main shaft through the other input pin; the output pin of the second AND gate is connected with one input pin of the third AND gate;
The third AND gate is respectively connected with a unit LCU remote control model action signal, a unit main shaft sealing system remote control mode action signal, a unit main shaft sealing shut-down soft pressing plate input signal and a main shaft sealing water interruption action signal through four input pins; the output pin of the third AND gate is connected with the IN pin of the first TON delay module;
A PT pin of the first TON delay module is connected with a first alarm delay T1, and a Q pin of the first TON delay module is connected with an IN pin of the second TON delay module; the PT pin of the second TON delay module is connected with a second alarm delay T2; and outputting a main shaft sealing water interruption alarm signal from a Q pin of the first TON delay module, and outputting a stop sign signal from a Q pin of the second TON delay module.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
The invention makes full use of program conditions to judge, and executes the warning of the interruption and shutdown protection of the main shaft working sealing water of the hydroelectric generating set through a scientific and reasonable process so as to control the timely and accurate starting of the accident shutdown process, so that on one hand, the risk of accidents such as flooding of a factory building and the like possibly caused by the untimely interruption and shutdown of the main shaft working sealing water can be effectively prevented, on the other hand, the potential hidden trouble of unplanned shutdown of the hydroelectric generating set caused by single signal outlet or signal jitter is eliminated, and the reliability, safety and economy of the interruption and shutdown control of the main shaft working sealing water are greatly improved.
Drawings
The invention will now be described by way of example and with reference to the accompanying drawings in which:
FIG. 1 is a flow chart of the execution of the method for protecting and alarming the interruption of working sealing water of the main shaft of the hydroelectric generating set.
FIG. 2 is a structural diagram of a water-break shutdown protection alarm device structure for a main shaft working seal of a hydroelectric generating set.
Detailed Description
All of the features disclosed in this specification, or all of the steps in a method or process disclosed, may be combined in any combination, except for mutually exclusive features and/or steps.
Any feature disclosed in this specification (including any accompanying claims, abstract) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. That is, each feature is one example only of a generic series of equivalent or similar features, unless expressly stated otherwise.
Example 1
The embodiment provides a water turbine unit main shaft working sealing water interruption shutdown protection alarm method, which is used for controlling an accident shutdown process of starting a water turbine generator unit.
As shown in fig. 1, the method comprises the steps of:
s1, in the running or standby process of the hydroelectric generating set, collecting and monitoring the flow Q of the main shaft sealing main pipe, and comparing the flow Q with a configured low-flow alarm value Q1 to obtain a first comparison signal.
The flow Q of the main shaft sealing main pipe for monitoring and directly collecting of the general hydroelectric generating set is collected through a flowmeter arranged on the main shaft sealing main pipe. In addition, the data are transmitted and reported to the logic judgment of the monitoring flow through a 4 mA-20 mA.DC signaling mode.
The configured low flow alarm value Q1 belongs to a judgment threshold value of the statistical value, namely, when the flow Q of the monitoring direct mining main shaft sealing main pipe recorded by the flowmeter is lower than the low flow alarm value Q1, the abnormality is judged. The low flow alert value Q1 is typically set to 6 m/h.
However, it is obviously not accurate enough to determine the main shaft working seal water interruption by only one parameter, and it is also necessary to determine the flow state. Therefore, step S2 is also designed, and in the running or standby of the hydroelectric generating set, the signal of the too low sealing flow of the direct mining main shaft is collected and monitored, and the signal is subjected to logical AND operation with the first comparison signal to obtain a flow state signal. The monitoring direct-mining main shaft sealing flow rate too low signal indicates whether the monitoring direct-mining main shaft sealing main pipe flow rate Q is lower than a configured flow rate too low action value Q2, and when the monitoring direct-mining main shaft sealing flow rate too low signal is at a high level, the monitoring direct-mining main shaft sealing main pipe flow rate Q is lower than the configured flow rate too low action value Q2. The flow rate excessively low operation value Q2 is smaller (slightly smaller) than the low flow rate alarm value Q1, and is generally 5 m/h.
The collection action of the monitoring direct-mining main shaft sealing flow too low signal of the general hydroelectric generating set is as follows: through disposing the too low action value Q2 of flow on the flowmeter body installed on main shaft seal house steward, when the main shaft seal house steward flow Q of the control direct sampling that the flowmeter gathered is lower than the too low action value Q2 of flow, output the high level (namely control direct sampling main shaft seal pressure too low signal) through the passive node on the flowmeter and send to the logical judgement of the control flow.
The flow state signal belongs to the sum of the total flow judgment results in the statistical dimension and the instantaneous state dimension, and improves the accuracy and the scientificity of total flow state judgment.
Similar status decisions are made in respect of manifold pressure. Comprising the following steps:
And S3, in the operation or standby of the hydroelectric generating set, collecting and monitoring the pressure P of the main sealing pipe of the direct mining main shaft, and comparing the pressure P with the configured low pressure alarm value P1 to obtain a second comparison signal.
The pressure P of the main shaft sealing main pipe for monitoring the direct mining of the general hydroelectric generating set is collected by a pressure sensor arranged on the main shaft sealing main pipe. Whereas the low pressure warning value P1 is typically 0.1MPa. In some embodiments, the data collected by the pressure sensor is also transmitted and reported to the logic judgment of the monitoring flow in a mode of 4 mA-20 mA.DC signaling.
S4, in the operation or standby of the hydroelectric generating set, collecting and monitoring a signal of too low sealing pressure of the direct mining main shaft, and performing logical AND operation on the signal and the second comparison signal to obtain a pressure state signal; the monitoring direct mining main shaft seal pressure too low signal indicates whether the monitoring direct mining main shaft seal total pipe pressure P is lower than a configured pressure too low action value P2. And when the monitoring direct mining main shaft sealing pressure is in a high level, the monitoring direct mining main shaft sealing main pipe pressure P is lower than the pressure too low action value P2.
Monitoring the acquisition action of the signal of the too low sealing pressure of the direct mining main shaft as: by configuring the pressure too low action value P2 on the pressure switch arranged on the main shaft sealing main pipe, when the pressure P of the monitoring direct-mining main shaft sealing main pipe is lower than the pressure too low action value P2, a passive node on the pressure switch outputs a signal for monitoring the direct-mining main shaft sealing pressure too low. In general, the pressure-too-low operation value P2 is smaller (slightly smaller) than the low-pressure alarm value P1, which is generally 0.08MPa.
S5, respectively acquiring a unit LCU remote control model action signal, a unit main shaft sealing system remote control mode action signal, a unit main shaft sealing shutdown soft pressing plate input signal and a main shaft sealing water interruption (local PLC) action signal during the operation or standby of the hydroelectric generating set. And performing logical AND operation on the unit LCU remote control model action signal, the unit main shaft sealing system remote control mode action signal, the unit main shaft sealing stop soft pressing plate input signal, the main shaft sealing water interruption action signal, the flow state signal and the pressure state signal to obtain a first control signal.
The unit LCU control mode is typically in a remote control mode. The control module of the unit spindle sealing system is generally in a remote control mode. The main shaft sealing water interruption (local PLC) action signal is that the main shaft sealing system of the machine set judges the main shaft sealing water interruption through logic in the local PLC, and then the main shaft sealing water interruption is sent to the monitoring system through a passive node signal and used as logic judgment of the monitoring flow. The machine set main shaft sealing shutdown soft pressing plate is a soft pressing plate in machine set main shaft sealing shutdown process control, can be convenient for operation and maintenance personnel to put on and draw off in a monitoring system, and can effectively prevent the process misoperation caused by maintenance personnel in the overhauling or defect eliminating process.
S6, performing two-stage delay error judgment on the first control signal, taking the action signal obtained by the first-stage delay error judgment as a main shaft sealing water interruption alarm signal, and taking the action signal obtained by the second-stage delay error judgment as a stop sign signal, wherein the stop sign signal indicates that a major mechanical accident (namely a class II mechanical accident, in addition, under the same standard, a class I accident refers to an extra large accident, a class III accident refers to a large accident, and a class IV accident refers to a general accident) occurs, so as to trigger starting an accident stop process.
Specifically, the two-stage delay error judgment process comprises the following steps:
When the first-stage delay judgment is carried out, for each rising edge in the first control signal, if the time from the rising edge to the latest falling edge is within the first alarm delay T1, eliminating a high-level signal from the rising edge to the latest falling edge; if the time from the rising edge to the latest falling edge exceeds the first alarm delay time T1, the rising edge is moved backwards for the duration of the first alarm delay time T1; and inputting the action signal obtained by the first-stage delay judgment into the second-stage delay judgment.
When the second-stage delay judgment is carried out, for each rising edge in the action signals obtained by the first-stage delay judgment, if the time from the rising edge to the latest falling edge is within the second alarm delay T2, eliminating the high-level signals from the rising edge to the latest falling edge; if the time from the rising edge to the latest falling edge exceeds the first alarm delay time T2, the rising edge is moved backwards by the duration of the first alarm delay time T2. The first alarm delay T1 is 120s, the first alarm delay T2 is 45min, the front-back difference of the two alarm delays can be controlled to be 10%, for example, the first alarm delay T1 is 120s plus or minus 10s, and the second alarm delay T2 is 45min plus or minus 5min.
Example 2
The embodiment provides a main shaft working sealing water interruption shutdown protection alarm device of a hydroelectric generating set, which comprises a first comparator 1, a second comparator 3, a first AND gate 2, a second AND gate 4, a third AND gate 5, a first TON delay module 6 and a second TON delay module 7, as shown in figure 2; wherein:
the input pin of the first comparator 1 is connected with the flow Q of the main shaft sealing main pipe for monitoring direct sampling, the reference pin of the first comparator 1 is connected with the low flow alarm value Q1, the output pin of the first comparator 1 is connected with one input pin of the first AND gate 2, and when the value of the input pin of the first comparator 1 is lower than the value of the reference pin, the output pin of the first comparator 1 outputs a high level. The flow Q of the main shaft sealing main pipe for monitoring and directly collecting of the general hydroelectric generating set is collected through a flowmeter arranged on the main shaft sealing main pipe. In addition, the data are transmitted and reported to the logic judgment of the monitoring flow through a4 mA-20 mA.DC signaling mode. And the low flow alert value Q1 is typically set to 6 m/h.
The first AND gate 2 is connected with a signal for monitoring the sealing flow of the direct mining main shaft to be too low through the other input pin. The monitoring direct-mining main shaft sealing flow rate too low signal indicates whether the monitoring direct-mining main shaft sealing main pipe flow rate Q is lower than a configured flow rate too low action value Q2, and when the monitoring direct-mining main shaft sealing flow rate too low signal is at a high level, the monitoring direct-mining main shaft sealing main pipe flow rate Q is lower than the configured flow rate too low action value Q2. The flow rate excessively low operation value Q2 is smaller (slightly smaller) than the low flow rate alarm value Q1, and is generally 5 m/h. Moreover, in some embodiments, the monitoring of the hydro-generator set directly adopts the collection action of the too low signal of the main shaft sealing flow as: through disposing the too low action value Q2 of flow on the flowmeter body installed on main shaft seal house steward, when the main shaft seal house steward flow Q of the control direct sampling that the flowmeter gathered is lower than the too low action value Q2 of flow, output the high level (namely control direct sampling main shaft seal pressure too low signal) through the passive node on the flowmeter and send to the logical judgement of the control flow. The output pin of the first and gate 2 is connected to one input pin of the third and gate 5.
The input pin of the second comparator 3 is connected with the pressure P of the main shaft seal main pipe for monitoring direct sampling, the reference pin of the second comparator 3 is connected with the low pressure alarm value P1, the output pin of the second comparator 3 is connected with one input pin of the second AND gate 4, and when the value of the input pin of the second comparator 3 is lower than the value of the reference pin, the output pin of the second comparator 3 outputs a high level. The pressure P of the main shaft sealing main pipe for monitoring the direct mining of the general hydroelectric generating set is collected by a pressure sensor arranged on the main shaft sealing main pipe. Whereas the low pressure warning value P1 is typically 0.1MPa. In some embodiments, the data collected by the pressure sensor is also transmitted and reported to the logic judgment of the monitoring flow in a mode of 4 mA-20 mA.DC signaling.
The second AND gate 4 is connected with a signal for monitoring the too low sealing pressure of the direct mining main shaft through the other input pin. Monitoring the direct mining main shaft seal pressure too low signal indicates whether the direct mining main shaft seal manifold pressure P is below a configured pressure too low actuation value P2. And when the monitoring direct mining main shaft sealing pressure is in a high level, the monitoring direct mining main shaft sealing main pipe pressure P is lower than the pressure too low action value P2. Monitoring the acquisition action of the signal of the too low sealing pressure of the direct mining main shaft as: by configuring the pressure too low action value P2 on the pressure switch arranged on the main shaft sealing main pipe, when the pressure P of the monitoring direct-mining main shaft sealing main pipe is lower than the pressure too low action value P2, a passive node on the pressure switch outputs a signal for monitoring the direct-mining main shaft sealing pressure too low. In general, the pressure-too-low operation value P2 is smaller (slightly smaller) than the low-pressure alarm value P1, which is generally 0.08MPa. The output pin of the second and gate 4 is connected to one input pin of the third and gate 5.
The third AND gate 5 is respectively connected with a unit LCU remote control model action signal, a unit main shaft sealing system remote control mode action signal, a unit main shaft sealing shut-down soft pressing plate input signal and a main shaft sealing water interruption action signal through four input pins; the output pin of the third AND gate 5 is connected to the IN pin of the first TON delay module 6. The unit LCU control mode is typically in a remote control mode. The control module of the unit spindle sealing system is generally in a remote control mode. The main shaft sealing water interruption (local PLC) action signal is that the main shaft sealing system of the machine set judges the main shaft sealing water interruption through logic in the local PLC, and then the main shaft sealing water interruption is sent to the monitoring system through a passive node signal and used as logic judgment of the monitoring flow. The machine set spindle sealing shutdown soft pressing plate is a soft pressing plate in the control of the machine set spindle sealing shutdown process.
The PT pin of the first TON delay module 6 is connected with the first alarm delay T1, and the Q pin of the first TON delay module 6 is connected with the IN pin of the second TON delay module 7; the PT pin of the second TON delay module 7 is connected with a second alarm delay T2; the main shaft sealing water interruption alarm signal is output from the Q pin of the first TON delay module 6, and the shutdown mark signal is output from the Q pin of the second TON delay module 7, wherein the shutdown mark signal indicates that a major mechanical accident occurs and is used for triggering and starting an accident shutdown process. As in embodiment 1, the first alarm delay T1 is 120s, and the second alarm delay T2 is 45min.
The invention is not limited to the specific embodiments described above. The invention extends to any novel one, or any novel combination, of the features disclosed in this specification, as well as to any novel one, or any novel combination, of the steps of the method or process disclosed.
Claims (9)
1. The utility model provides a water-break shutdown protection and alarm method for a main shaft working seal of a hydroelectric generating set, which is characterized by comprising the following steps:
during the running or standby of the hydroelectric generating set, collecting and monitoring the flow Q of the main shaft sealing main pipe, and comparing the flow Q with the configured low-flow alarm value Q1 to obtain a first comparison signal;
During the running or standby of the hydroelectric generating set, collecting and monitoring the sealing flow rate too low signal of the direct mining main shaft, and performing logical AND operation with the first comparison signal to obtain a flow rate state signal; the monitoring direct mining main shaft sealing flow rate too low signal indicates whether the monitoring direct mining main shaft sealing main pipe flow rate Q is lower than a configured flow rate too low action value Q2 or not;
During the running or standby of the hydroelectric generating set, collecting and monitoring the pressure P of the sealing main pipe of the direct mining main shaft, and comparing the pressure P with the configured low pressure alarm value P1 to obtain a second comparison signal;
During the running or standby of the hydroelectric generating set, collecting and monitoring the signal of the too low sealing pressure of the direct mining main shaft, and carrying out logical AND operation on the signal and the second comparison signal to obtain a pressure state signal; the monitoring direct mining main shaft sealing pressure too low signal indicates whether the monitoring direct mining main shaft sealing main pipe pressure P is lower than a configured pressure too low action value P2 or not;
During the running or standby of the hydroelectric generating set, respectively acquiring a set LCU remote control model action signal, a set main shaft sealing system remote control mode action signal, a set main shaft sealing stop soft pressing plate input signal and a main shaft sealing water interruption action signal; performing logical AND operation on the unit LCU remote control model action signal, the unit main shaft sealing system remote control mode action signal, the unit main shaft sealing stop soft pressing plate input signal, the main shaft sealing water interruption action signal, the flow state signal and the pressure state signal to obtain a first control signal;
Performing two-stage delay error judgment on the first control signal, including: when the first-stage delay judgment is carried out, for each rising edge in the first control signal, if the time from the rising edge to the latest falling edge is within the first alarm delay T1, eliminating a high-level signal from the rising edge to the latest falling edge; if the time from the rising edge to the latest falling edge exceeds the first alarm delay time T1, the rising edge is moved backwards for the duration of the first alarm delay time T1; inputting the action signal obtained by the first-stage delay judgment into the second-stage delay judgment; when the second-stage delay judgment is carried out, for each rising edge in the action signals obtained by the first-stage delay judgment, if the time from the rising edge to the latest falling edge is within the second alarm delay T2, eliminating the high-level signals from the rising edge to the latest falling edge; if the time from the rising edge to the latest falling edge exceeds the first alarm delay time T2, the rising edge is moved backwards for the duration of the first alarm delay time T2; the action signal obtained by the first-stage delay judgment is used as a main shaft sealing water interruption alarm signal, and the action signal obtained by the second-stage delay judgment is used as a shutdown mark signal for triggering the starting of an accident shutdown process.
2. The method for protecting and alarming the interruption of the working sealing water of the main shaft of the hydroelectric generating set is characterized in that the flow Q of the main shaft sealing main pipe for monitoring and directly picking and/or the pressure P of the main shaft sealing main pipe for monitoring and directly picking are transmitted and reported in a 4 mA-20 mA.DC signal mode after being collected.
3. The method for protecting and alarming the interruption of the working sealing water of the main shaft of the hydroelectric generating set according to claim 1, wherein the low flow alarm value Q1 is 6 m/h.
4. The method for protecting and alarming the interruption of the working seal water of the main shaft of the hydroelectric generating set according to claim 1, wherein the low-pressure alarm value P1 is 0.1MPa.
5. The method for protecting and alarming the interruption of the working sealing water of the main shaft of the hydroelectric generating set according to claim 1, wherein the first alarming time delay T1 is 120s plus or minus 10s, and the second alarming time delay T2 is 45min plus or minus 5min.
6. The method for protecting and alarming the interruption of the working seal water of the main shaft of the hydroelectric generating set according to claim 1, wherein the acquisition action of monitoring the signal of the too low sealing pressure of the direct-extraction main shaft is as follows: by configuring the flow rate too low action value Q2 on the flowmeter body arranged on the main shaft sealing main pipe, when the flow rate Q of the monitoring direct-mining main shaft sealing main pipe collected by the flowmeter is lower than the flow rate too low action value Q2, a passive node on the flowmeter outputs a monitoring direct-mining main shaft sealing pressure too low signal.
7. The method for protecting and alarming the interruption of the working seal water of the main shaft of the hydroelectric generating set according to claim 1, wherein the acquisition action of monitoring the signal of the too low sealing pressure of the direct-extraction main shaft is as follows: by configuring the pressure too low action value P2 on the pressure switch arranged on the main shaft sealing main pipe, when the pressure P of the monitoring direct-mining main shaft sealing main pipe is lower than the pressure too low action value P2, a passive node on the pressure switch outputs a signal for monitoring the direct-mining main shaft sealing pressure too low.
8. The method for protecting and alarming the interruption of the working seal water of the main shaft of the hydroelectric generating set according to claim 1, wherein the flow rate excessively low action value Q2 is lower than the low flow rate alarm value Q1.
9. The main shaft working sealing water interruption shutdown protection alarm device of the hydroelectric generating set is characterized by comprising a first comparator, a second comparator, a first AND gate, a second AND gate, a third AND gate, a first TON delay module and a second TON delay module; wherein:
The input pin of the first comparator is connected with the flow Q of the direct collection main shaft sealing main pipe, the reference pin of the first comparator is connected with the low flow alarm value Q1, the output pin of the first comparator is connected with one input pin of the first AND gate, and when the value of the input pin of the first comparator is lower than the value of the reference pin of the first comparator, the output pin of the first comparator outputs high level;
the first AND gate is connected with a signal for monitoring the too low flow of the direct mining main shaft seal through the other input pin; the output pin of the first AND gate is connected with one input pin of the third AND gate;
The input pin of the second comparator is connected with the pressure P of the direct-picking main shaft sealing main pipe, the reference pin of the second comparator is connected with a low-pressure alarm value P1, the output pin of the second comparator is connected with one input pin of the second AND gate, and when the value of the input pin of the second comparator is lower than the value of the reference pin of the second comparator, the output pin of the second comparator outputs a high level;
The second AND gate is connected with a signal for monitoring the too low sealing pressure of the direct mining main shaft through the other input pin; the output pin of the second AND gate is connected with one input pin of the third AND gate;
The third AND gate is respectively connected with a unit LCU remote control model action signal, a unit main shaft sealing system remote control mode action signal, a unit main shaft sealing shut-down soft pressing plate input signal and a main shaft sealing water interruption action signal through four input pins; the output pin of the third AND gate is connected with the IN pin of the first TON delay module;
A PT pin of the first TON delay module is connected with a first alarm delay T1, and a Q pin of the first TON delay module is connected with an IN pin of the second TON delay module; the PT pin of the second TON delay module is connected with a second alarm delay T2; and outputting a main shaft sealing water interruption alarm signal from a Q pin of the first TON delay module, and outputting a stop sign signal from a Q pin of the second TON delay module.
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| CN116538000A (en) * | 2023-05-17 | 2023-08-04 | 三峡金沙江川云水电开发有限公司 | System for judging mechanical overspeed fault shutdown of hydroelectric generating set |
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| DE102012015654A1 (en) * | 2012-08-09 | 2014-05-15 | Imo Holding Gmbh | Method and device for detecting and monitoring the state of assemblies and components. |
| CN104953871B (en) * | 2013-06-08 | 2017-12-29 | 昂宝电子（上海）有限公司 | System and method for carrying out two class protection to power converting system |
| DE102021107723A1 (en) * | 2020-03-29 | 2021-09-30 | Maxim Integrated Products, Inc. | Systems and methods for error detection and reporting via transceivers of serial interfaces |
| CN114183293B (en) * | 2021-11-10 | 2023-07-14 | 中国长江电力股份有限公司 | Series-parallel connection startup and shutdown method for hydropower station unit |
| CN114412686B (en) * | 2021-12-23 | 2024-02-20 | 黄河水利水电开发集团有限公司 | Water turbine main shaft sealing performance monitoring and evaluating method |
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| CN116538000A (en) * | 2023-05-17 | 2023-08-04 | 三峡金沙江川云水电开发有限公司 | System for judging mechanical overspeed fault shutdown of hydroelectric generating set |
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