CN107727191A - A kind of liquid level lifts alarm method - Google Patents
A kind of liquid level lifts alarm method Download PDFInfo
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- CN107727191A CN107727191A CN201710992400.9A CN201710992400A CN107727191A CN 107727191 A CN107727191 A CN 107727191A CN 201710992400 A CN201710992400 A CN 201710992400A CN 107727191 A CN107727191 A CN 107727191A
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- liquid level
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/80—Arrangements for signal processing
- G01F23/802—Particular electronic circuits for digital processing equipment
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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
- G01M3/32—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 for containers, e.g. radiators
- G01M3/3236—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 for containers, e.g. radiators by monitoring the interior space of the containers
Abstract
The invention discloses a kind of liquid level to lift alarm method, comparison system current level and liquid level before setting interval time, when liquid level difference reaches setting value, sends liquid level lifting alarm signal；The calculating of its liquid level difference uses and goes interference calculation method, by Logical Configuration, using a series of signal processing method, there is stronger antijamming capability, the present invention carries out digital filtering and operating mode amendment to live liquid level signal, essentially eliminates the influence of the operating mode factor to liquid level such as expand with heat and contract with cold.Current level uses short time moving average, reduce further the interference of liquid level external waviness and other signals.Liquid level used the average value before the long period in the past, the influence of the Wave crest and wave trough of large period when reducing liquid level normal fluctuation, alarm accuracy can be doubled.The present invention can have found its small eustasy trend in the liquid level of fluctuation, and the initial stage of minute leakage occurs in system, can just send alarm signal in time.
Description
Technical field
The present invention relates to the method that a kind of lifting of liquid level is detected and alarmed, and specifically, is related to a kind of suitable for water, oil etc.
Liquid system, the method that alarm can be sent in time when system leaks.
Background technology
At present, the liquid level rate of change overload alarm method of use, can reflect system leak situation in time.But general water
With the liquid system such as oil, tank fill level fluctuation is all larger at work, and when system leak amount is smaller, liquid level caused by leakage becomes
Rate is much smaller than liquid level rate of change caused by liquid level normal fluctuation, and therefore, this method can not monitor the leakage of low discharge.Liquid level
Fluctuate larger system, conventional alarm method is the high and low limit alarm of liquid level, when liquid level rise or fall reach setting height,
During low value, alarm signal is sent.When alarm signal is sent, the leakage existing long period occurs for system, it is impossible to finds and locates in time
Defect is managed, system equipment may be damaged.Leakage energy at initial stage is occurring in time in order to solve the larger system of level fluctuation
Send alarm, it is necessary to develop a kind of stronger liquid level lifting alarm method of antijamming capability, can be found in the liquid level of fluctuation
Its small eustasy trend.
The content of the invention
The present invention is precisely in order to a kind of liquid level lifting alarm method for solving above-mentioned technical problem and designing.
The technical solution adopted for the present invention to solve the technical problems is：
A kind of liquid level lifts alarm method, comparison system current level and liquid level before setting interval time, works as liquid level difference
When reaching setting value, liquid level lifting alarm signal is sent；Using interference calculation method is gone, its method is as follows for the calculating of liquid level difference：
(1) liquid level signal is output to an input of adder after digital filter；
(2) liquid level revise signal is connected with another input of adder；
(3) current level：The moving average of output current level is obtained in the output of adder through hysteresis block, i.e., current
Liquid level；According to the fluctuation situation of liquid level in short time during system worked well using short time moving average or directly with process
Filtering and the liquid level signal of amendment；
(4) liquid level in the past：The moving average of output current level is obtained in the output of adder through Time-domain Statistics module, i.e.,
Liquid level in the past；A circulation timing is formed by phase inverter and two timers, timing is provided for Time-domain Statistics module, according to liquid level
Long-time fluctuation tendency, the average value of long period is selected, to reduce influence of the other factors to liquid level in addition to leakage；
(5) alarm liquid level difference setting value：According to current level and fluctuation difference of the former liquid level in system worked well
It is determined that less times greater than normal fluctuation difference；
(6) liquid level rate of change is determined：Minimum of the leakage to the influence degree determination alarm needs of liquid level is occurred according to system
Liquid level rate of change, liquid level rate of change are used for the time in counting period；
(7) interval time is set：After the determination of liquid level difference setting value, interval time is longer, liquid level rate of change during alarm
Smaller, alarm accuracy is higher；Interval time calculation formula is as follows：
Δ t=Δ H ÷ v
In formula：Δ t --- interval time setting value, min；
Δ H --- liquid level difference setting value, mm；
V --- minimum level eustasy rate, mm/min；
(8) no-harass switch module mode of operation：The X1 inputs of no-harass switch module are connected with hysteresis block output end Y,
The X2 inputs of no-harass switch module are connected with Time-domain Statistics module output end Yj, the Z inputs of no-harass switch module with it is simple
The output end D of digital manual operator is connected；Simple digital manual operator moves back selection key as alarm throwing, when to put into state, unperturbed
Handover module selection X2 " liquid level in the past " passes through；When to exit state, no-harass switch module selection X1 " current level " passes through；
(9) normal phase input end of adder is connected with the output end Y of hysteresis block, the inverting input and time domain of adder
The output end Yj of statistical module is connected, and the output end of adder is connected with the input X that high lower bound is alarmed, and high lower bound is alarmed defeated
Go out to hold D1 to export water level rising alarm signal and give switching value function of surfing the Net block, the output end D2 output water level decreasings of high lower bound alarm
Alarm signal gives switching value function of surfing the Net block；In alarm input state, " current level " compared with " before liquid level ", when its difference
Water level ascending, descending alarm signal is sent during more than high and low limit alarm setting value；When state is exited in alarm, two of adder are defeated
It is all " current level " to enter signal, and difference is zero, and any situation is all without alarm.
A kind of liquid level lifting alarm method, its live liquid level signal is according to the signal characteristic of liquid level gauge using corresponding
Digital filtering removes interference.
A kind of liquid level lifting alarm method, its liquid level revise signal is in order to which the operating mode factor such as exclude to expand with heat and contract with cold is to liquid
The influence of position, temperature adjustmemt or the amendment of other working conditions are carried out to liquid level signal.
A kind of liquid level lifting alarm method, in order to improve alarm accuracy, liquid level difference setting value is unsuitable too high, and frequency occurs
During the very low false alarm in short-term of rate, it can just be sent by the way that alarm signal was delayed after certain time, mistake can be reduced to greatest extent
Alarm.
Signified system leak includes leaking into and spilling two kinds of situations in the present invention, and leaking into rises liquid level, and spilling makes liquid level
Decline.The present invention carries out digital filtering and operating mode amendment to live liquid level signal, essentially eliminates the operating mode factor such as expand with heat and contract with cold
Influence to liquid level.Current level uses short time moving average, reduce further liquid level external waviness and other signals
Interference.Liquid level used the average value before the long period, the Wave crest and wave trough of large period when reducing liquid level normal fluctuation in the past
Influence, alarm accuracy can be doubled.Ought more than comprehensive use after a variety of jamproof technical methods, during nominal situation
The deviation very little of preceding liquid level and former liquid level, the very little that the liquid level difference setting value of alarm can be set, determined in liquid level difference setting value
Afterwards, interval time is longer, and liquid level rate of change during alarm is smaller, and alarm accuracy is higher, can be found in the liquid level of fluctuation
Its small eustasy trend, the initial stage of minute leakage occurs in system, can just send alarm signal in time.
The beneficial effects of the invention are as follows a kind of liquid level lifting alarm method to have stronger antijamming capability, can be sent out in system
At raw leakage initial stage, liquid level variation tendency is judged in time, sends alarm signal.
Brief description of the drawings
Fig. 1 is schematic structural view of the invention.
Fig. 2 is embodiment cistern water level short time (5 minutes) tendency chart.
Fig. 3 is embodiment cistern water level (one day) tendency chart for a long time.
Embodiment
The present invention is further described with reference to the accompanying drawings and examples.
As shown in figure 1, a kind of present invention liquid level lifting alarm method, comparison system current level and setting interval time with
Preceding liquid level, liquid level ascending, descending alarm signal is sent when its difference exceedes high and low limit alarm setting value；The calculating of its liquid level difference is adopted
Interference calculation method is spent, its method is as follows：
1. liquid level signal 101 is output to an input of adder 104 after the filtering of digital filter 103；
2. liquid level revise signal 102 is connected with another input of adder 104；
3. current level：The moving average of output current level is obtained in the output of adder 104 through hysteresis block 105,
That is current level；According to the fluctuation situation of liquid level in short time during system worked well using short time moving average or directly
With the liquid level signal with amendment after filtering；
(liquid level before 4.：The movement that output current level is obtained in the output of adder 104 through Time-domain Statistics module 109 is put down
Average, i.e., former liquid level；A circulation timing is formed by phase inverter 108 and two timers 106,107, is Time-domain Statistics module
109 provide timing, according to the long-time fluctuation tendency of liquid level, select the average value of long period, to reduce its in addition to leakage
His influence of the factor to liquid level；
5. alarm liquid level difference setting value：It is true according to fluctuation difference of the current level with former liquid level in system worked well
It is fixed, less times greater than normal fluctuation difference；
6. determine liquid level rate of change：Minimum liquid of the leakage to the influence degree determination alarm needs of liquid level is occurred according to system
Position rate of change, liquid level rate of change are used for the time in counting period；
7. set interval time：After the determination of liquid level difference setting value, interval time is longer, and liquid level rate of change during alarm is got over
Small, alarm accuracy is higher；Interval time calculation formula is as follows：
Δ t=Δ H ÷ v
In formula：Δ t --- interval time setting value, min；The output end Yj of 1 Time-domain Statistics module 109 is connected, no-harass switch
The Z inputs of module 111 are connected with the output end D of simple digital manual operator 110；Simple digital manual operator 110 is thrown as alarm
Selection key is moved back, when to put into state, no-harass switch module 111 selects X2 " liquid level in the past " to pass through；When to exit state, nothing
Disturbing handover module 111 selects X1 " current level " to pass through；
9. the normal phase input end of adder 112 is connected with the output end Y of hysteresis block 105, the anti-phase input of adder 112
End is connected with the output end Yj of Time-domain Statistics module 109, the output end of adder 112 and the input X phases of high lower bound alarm 113
Even, the output end D1 of high lower bound alarm 113 exports water level rising alarm signal to switching value function of surfing the Net block 114, high lower bound report
Alert 113 output end D2 exports water level decreasing alarm signal to switching value function of surfing the Net block 115；It is " current in alarm input state
Liquid level " was compared with " before liquid level ", and the difference position that floods when being more than alarm liquid level difference setting value rises alarm signal, and difference is less than report
Flood position alarming decrease signal during alert liquid level difference setting value；When state is exited in alarm, two input signals of adder 112 are all
It is " current level " that difference is zero, and any situation is all without alarm.
A kind of liquid level lifting alarm method, its live liquid level signal 101 use phase according to the signal characteristic of liquid level gauge
The digital filtering answered removes interference.
A kind of liquid level lifting alarm method, its liquid level revise signal 102 is for the operating mode factor such as exclude to expand with heat and contract with cold
Influence to liquid level, temperature adjustmemt or the amendment of other working conditions are carried out to liquid level signal.
A kind of liquid level lifting alarm method, in order to improve alarm accuracy, liquid level difference setting value is unsuitable too high, and frequency occurs
During the very low false alarm in short-term of rate, it can just be sent by the way that alarm signal was delayed after certain time, mistake can be reduced to greatest extent
Alarm.
Embodiment one
Referring to Fig. 1, be DCS in Power Plant (DCS) distributed processing unit (DPU) in Logical Configuration figure.
Each unit is that configuration software predefines functional block in figure.Field liquid level signal 101 and liquid level revise signal 102 are using analog quantity between page
Input function block (XPgAI), 103 be digital filtering (Filter), and 104,112 be adder (Add), and 105 be hysteresis block
(Delay), 106,107 be timer (Timer), and 108 be phase inverter (Not), and 109 be Time-domain Statistics module (TSum), and 110 are
Simple digital manual operator (D/MA), 111 be no-harass switch module (SFT), and 113 be high lower bound alarm (HLAlm), and 114,115 are
Switching value function of surfing the Net block (XNetDO).
Power plant boiler plasma ignition device cooling water tank water level decreasing alarm method, have two in alarming logic configuration
Individual input signal (cistern water level signal 101, water tank temperature signal 102), two output signals.The cistern water level signal warp of input
Cross 103 digital filterings and can remove interference signal, then temperature adjustmemt is carried out by 104, reduce the influence expanded with heat and contract with cold." current water
Position " uses 60 seconds moving averages 105, further reduces water surface ripple and the influence of other interference signals.106th, 107,108 groups
Into the function of a circulation timing, 107 set interval time as one hour (3600 seconds), and the time sends reset signal after, weight
It is new to start timing.During the timing of timer 107,109 statistics water level average values, wherein Y is real-time statistics average value, and Yj is previous
Secondary statistical result." liquid level in the past " uses the hourly average water level counted before Yj values, that is, 1-2 hours.110 as report
Selection key is moved back in alert throwing, and input state 111 selects X2 " liquid level in the past " by exiting state 111 and selecting X1 " current level " to pass through.
Alarm input state, " current level " compared with " before liquid level ", shampoo position rising alarm signal, difference when difference is more than 5mm
Flood position alarming decrease signal during less than -5mm.State is exited in alarm, and 112 two input signals are all " current levels ", difference
It is zero, any situation is all without alarm.
Normal operation water-level fluctuation short cycle about 1 minute in Fig. 2, therefore, setting " current level " were moved using 60 seconds
Dynamic average value.
The regular fluctuation of water level is no more than 30mm in one day in Fig. 3, and fluctuation maximum deviation is more than 50mm." liquid level in the past "
Using the average level of 60 minutes good representation levels of average value energy." current level " and " liquid level in the past " after treatment
Compare, difference is generally no greater than ± 5mm, therefore, sets the liquid level difference of alarm as ± 5mm.
Embodiment carries out digital filtering and operating mode amendment to cistern water level signal, essentially eliminate expand with heat and contract with cold etc. operating mode because
Influence of the element to water level.Current level uses moving average, reduce further the interference of water surface ripple and other signals.With
Preceding liquid level uses the average value of long period, and the influence of the Wave crest and wave trough of large period when reducing water level normal fluctuation can be
Alarm accuracy doubles.A variety of jamproof processing methods more than, finally it can reach 30mm extremely in water level normal fluctuation
In the case of 50mm, 5mm eustasy trend is found, the initial stage of minute leakage occurs in system, can just send alarm signal in time
Number.
The present invention is not limited to above-mentioned preferred forms, anyone the present invention enlightenment under draw other it is any with
Product as the present invention is same or like, is within the scope of the present invention.
Claims (4)
1. a kind of liquid level lifts alarm method, comparison system current level and liquid level before setting interval time, when liquid level difference reaches
During to setting value, liquid level lifting alarm signal is sent；It is characterized in that：The calculating of liquid level difference uses and goes interference calculation method, its side
Method is as follows：
1. liquid level signal (101) is output to an input of adder (104) after digital filter (103) filtering；
2. liquid level revise signal (102) is connected with another input of adder (104)；
3. current level：The moving average of output current level is obtained in the output of adder (104) through hysteresis block (105),
That is current level；According to the fluctuation situation of liquid level in short time during system worked well using short time moving average or directly
With the liquid level signal with amendment after filtering；
4. liquid level in the past：The rolling average of output current level is obtained in the output of adder (104) through Time-domain Statistics module (109)
Value, i.e., former liquid level；A circulation timing is formed by phase inverter (108) and two timers (106,107), is Time-domain Statistics mould
Block (109) provides timing, according to the long-time fluctuation tendency of liquid level, selects the average value of long period, to reduce in addition to leakage
Influence of the other factors to liquid level；
5. alarm liquid level difference setting value：Determined according to the fluctuation difference of current level and former liquid level in system worked well,
Less times greater than normal fluctuation difference；
6. determine liquid level rate of change：Leakage is occurred according to system the minimum level of alarm needs, which becomes, to be determined to the influence degree of liquid level
Rate, liquid level rate of change are used for the time in counting period；
7. set interval time：After the determination of liquid level difference setting value, interval time is longer, and liquid level rate of change during alarm is smaller,
Alarm accuracy is higher；Interval time calculation formula is as follows：
Δ t=Δ H ÷ v
In formula：Δ t --- interval time setting value, min；
Δ H --- liquid level difference setting value, mm；
V --- minimum level eustasy rate, mm/min；
No-harass switch module 8. (111) mode of operation：The X1 inputs of no-harass switch module (111) and hysteresis block (105) are defeated
Go out to hold Y to be connected, the X2 inputs of no-harass switch module (111) are connected with Time-domain Statistics module (109) output end Yj, no-harass switch
The Z inputs of module (111) are connected with the output end D of simple digital manual operator (110)；Simple digital manual operator (110) conduct
Selection key is moved back in alarm throwing, and when to put into state, no-harass switch module (111) selection X2 " liquid level in the past " passes through；When to exit
During state, no-harass switch module (111) selection X1 " current level " passes through；
9. the normal phase input end of adder (112) is connected with the output end Y of hysteresis block (105), adder (112) it is anti-phase defeated
Enter end with the output end Yj of Time-domain Statistics module (109) to be connected, output end and the high lower bound alarm (113) of adder (112)
Input X is connected, and the output end D1 of high lower bound alarm (113) exports water level rising alarm signal and gives switching value function of surfing the Net block
(114), the output end D2 of high lower bound alarm (113) exports water level decreasing alarm signal to switching value function of surfing the Net block (115)；
Alarm input state, " current level " compared with " before liquid level ", when its difference exceed it is high and low limit alarm setting value when send water
Position ascending, descending alarm signal；When state is exited in alarm, two input signals of adder (112) are all " current levels ", difference
It is zero, any situation is all without alarm.
A kind of 2. liquid level lifting alarm method according to claim 1, it is characterised in that：Live liquid level signal (101) root
Interference is removed using corresponding digital filtering according to the signal characteristic of liquid level gauge.
A kind of 3. liquid level lifting alarm method according to claim 1, it is characterised in that：Liquid level revise signal (102) is
The influence of the operating mode factor to liquid level such as exclude to expand with heat and contract with cold, and carries out temperature adjustmemt to liquid level signal or other working conditions are repaiied
Just.
A kind of 4. liquid level lifting alarm method according to claim 1, it is characterised in that：In order to improve alarm accuracy, liquid
Potential difference setting value is unsuitable too high, can be by the way that alarm signal was delayed after certain time during the very low false alarm in short-term of occurrence frequency
Just send, false alarm can be reduced to greatest extent.
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Application publication date: 20180223 |