CN102707745B - Temperature control method based on symbol identification in cable current-carrying capacity heat cycling test - Google Patents
Temperature control method based on symbol identification in cable current-carrying capacity heat cycling test Download PDFInfo
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Abstract
The invention relates to a temperature control method based on symbol identification in a cable current-carrying capacity heat cycling test, symbol value computing is carried out on the acquired temperature and current, the symbol value which reflects the current temperature control state is obtained, the target parameters are upgraded after the symbol value judgment, a voltage regulator motor is controlled to rotate positively and negatively, the temperature rising and reducing control is realized, after the temperature reaches the set state, the symbol values of temperature and current signals are repeatedly extracted, the motor is controlled again to operate, and accordingly, the quick stable temperature control process is realized. By the temperature control method, the temperature of a cable conductor in the cable current-carrying capacity heat cycling test is quickly stabilized at the set value, the temperature control process has better robustness, the temperature overshoot and oscillation are suppressed, the whole control process is simple to realize, has less calculations and exact control logic, and can be widely applied to the conductor temperature control or the constant value control of variable parameters with the similar requirements.
Description
Technical field
The present invention relates to a kind of power cable measuring technology, the temperature-controlled process of particularly differentiating based on symbol in a kind of current-carrying capacity of cable circulating-heating test.
Background technology
In power cable test, the current-carrying capacity-temperature relation of cable has directly reacted operating characteristic and the actual current capacity allowing of cable.According to the IEC60364 of International Electrotechnical Commission standard regulation, insulating material is the cable of Polyvinylchloride (PVC), and conductor temperature is limited to 70 DEG C; Crosslinked polyethylene (XPLE) and ethylene-propylene compound (EPR) cable, conductor temperature is limited to 90 DEG C; Mineral not near bare cable, conductor temperature is limited to 105 DEG C.Implement current-carrying capacity circulating-heating test fast for dissimilar cable, reach the upper temperature limit of cable permission and maintain the main contents that become at least 2 hours in current cable data test.In test in the past, scientific research institution adopts current value that rated current-carrying capacity computing formula to specify in IEC60287 standard or its deformation formula calculate as a reference, thereby realizing cable temperature, manual adjustments cable loading current value is progressively stabilized to the method for design temperature, adjusting, computation process complexity, loaded down with trivial details, process of the test is subject to the impact of personnel and environment, when long, stablizing effect and control accuracy are not high, and the adjusted value of different temperatures changes very difficult.Number of patent application CN200810048229.7 discloses a kind of power cable conductor temperature automatic following and control method, by accounting temperature rate of change, temperature stabilization feature, obtain electric current adjusting range according to current setting value, reaches the object that temperature is followed the tracks of.The method has realized temperature controlled robotization in electric cable heating process to a certain extent, but do not consider noise and the mechanism of target current amendment and the generality of amendment amplitude in measuring process, control procedure robustness deficiency, the transit time of temperature stabilization is longer.Application for a patent for invention CN200910192506.6 discloses a kind of definite method and determining device of current-carrying capacity of cable, by setting the initial value of cable conductor electric current, temperature, the final equilibrium temperature of calculating conductor, by continuous iteration correcting current, temperature value, finally reach stable upper temperature limit, realize determining of current-carrying capacity of cable.Although the method provides exercisable test method to the actual permission of cable current-carrying capacity definite, its control procedure is still that a kind of temperature is attempted the process of approaching, whole temperature adjusting overlong time.
Summary of the invention
It is long to the present invention be directed in current-carrying capacity of cable circulating-heating test the temperature stabilization time, the problem that control accuracy is not high, the temperature-controlled process of differentiating based on symbol in a kind of current-carrying capacity of cable circulating-heating test has been proposed, it is temperature stabilization control method fast in the test of a kind of current-carrying capacity of cable circulating-heating, extract the characteristic parameter that reflects temperature changing trend in measuring process, utilize its symbol characteristic to make temperature control decision, realize temperature stabilization control fast, improve the robustness of control procedure, reduce the sluggishness in temperature controlled processes, hyperharmonic reforming phenomena.
Technical scheme of the present invention is: the temperature-controlled process of differentiating based on symbol in a kind of current-carrying capacity of cable circulating-heating test, specifically comprises the steps:
1) according to cable type, call initial parameter and set subroutine, set target setting temperature in subroutine in initial parameter, the cross-section of cable is long-pending, and cable maximum is born electric current, the minimum electric current of differentiating of cable, cycle index, heating-up time, temperature fall time, according to the long-pending current coefficient of selecting of the cross-section of cable, initial parameter is set and is finished;
2) circulating-heating starts key-press status judgement, if do not started, waits for; Start to enter next step;
3) call AD data acquisition and filtering subroutine, gather several transient temperatures and be averaged and obtain median-filtered result, use as temperature input signal; Gather several momentary currents and be averaged and obtain median-filtered result, as current input signal, AD gathers end;
4) call sign amount is extracted subroutine, the symbol weight judgment threshold of design temperature; The symbol weight judgment threshold of design temperature slope; Set the symbol weight judgment threshold of electric current; Set the symbol weight judgment threshold of electric current slope, according to formula 1 computing,
Formula 1 is
Wherein, x is characteristic information variable quantity,
for setting value,
for the threshold value of setting value; "+" representation feature information is greater than the upper limit of setting value, and within the scope of the bound of " 0 " representation feature information in setting value, "-" representation feature information is less than the lower limit of setting value; Obtain temperature slope symbol, target temperature symbol, electric current slope symbol, target current symbol by formula 1, be respectively
,
,
,
5) call sign amount judges subroutine, carry out pressure regulator motor action symbol according to formula 2 and obtain,
Formula 2 is
OUT(M)=JudgeMotor[INPUT(
，
，
，
)]，
Concrete operation process adopts three computings in formula 3 to shine upon,
Formula 3 is
OUT(M)=+=JudgeMotor[(*,*,*,-)]
OUT(M)=-=JudgeMotor[(*,*,*,+)]
OUT(M)=0=JudgeMotor[(*,*,*,0)]
According to the output symbol of OUT (M), obtain the manner of execution immediately of motor, wherein, OUT (M)=+, motor forward; OUT (M)=-, motor reversal; OUT (M)=0, motor stops, and * is for the item of information that does not affect the judgement of signal code feature in signal code characteristic model;
Carry out target current parameter modification symbol decision according to formula 4, obtain CHANGE (I),
Formula 4 is
CHANGE(I)=JudgeCurrent[INPUT(
，
，
)]
Three mappings in concrete operation process reference formula 5 complete,
Formula 5 is
CHANGE(I)=+=JudgeCurrent[(-,-,*,0) or (0,-,*,0)]
CHANGE(I)=0=JudgeCurrent[(*,0,*,0) or (+,-,*,0) or (-,+,*,0)]
CHANGE(I)=-= JudgeCurrent[(+,+,*,0) or (0,+,*,0))]
6) call parameters is upgraded subroutine, according to the speed requirement of temperature stabilization time, sets delay time, and call parameters is upgraded subroutine, the delay time of setting, and delay time arrives call parameters and upgrades subroutine, and the timer that resets; Delay time is less than entering step 7), and target current renewal process is upgraded according to formula 6,
4 operational formulas in formula 6 are:
，
Wherein,
for the current value of initial setting,
for the current value of current setting, it is that k primary current parameter is upgraded that k represents current,
for intermediate variable, MAX[] for getting large value function,
differentiate current value for the minimum in target current value renewal process, and is " with computing ", target temperature
generally, after initial parameter is set, do not make an amendment; While leaveing no choice but revise, can again in the time being recycled to this position, reset at every turn;
7) heating-up time is to no, if the heating-up time to; enter next step temperature-fall period, do not return to step 2);
8) enter temperature-fall period: temperature-fall period only need to carry out OUT (M)=-, allow pressure regulator motor reversal be reset to initial zero limit of motor, pressure regulator motor will be protected by travel switch after dropping to zero limit, will forbid that motor reversal only allows motor forward;
9) temperature fall time is to no, if temperature fall time to; enter next step, be less than and return to step 2);
10) call initial parameter value and set subroutine, carry out initialization setting again;
11) cycle index is to no, if cycle index to; exit circulating-heating process, enter next step, do not turn back to step 2);
12) reset operation, pressure regulator motor is got back to zero-bit, and each power-on switch is in gate-dividing state, and Testing Software resets to original state, and prompting frame prompting process of the test stops;
13) off-test.
Beneficial effect of the present invention is: the temperature-controlled process of differentiating based on symbol in current-carrying capacity of cable circulating-heating test of the present invention, can realize cable conductor temperature fast and stable in the test of current-carrying capacity of cable circulating-heating and arrive setting value, temperature controlled processes has good robustness, temperature overshoot and concussion are suppressed, whole control procedure realizes simply, operand is few, steering logic is clear and definite, can be widely used in conductor temperature control or have in the constant control of slow varying parameter of similar demand.
Brief description of the drawings
Fig. 1 is the temperature-controlled process control general flow chart of differentiating based on symbol in current-carrying capacity of cable circulating-heating test of the present invention;
Fig. 2 is that in the temperature-controlled process of differentiating based on symbol in current-carrying capacity of cable circulating-heating test of the present invention, initial parameter is set subroutine flow chart;
Fig. 3 is AD data acquisition and filtering subroutine flow chart in the temperature-controlled process of differentiating based on symbol in current-carrying capacity of cable circulating-heating test of the present invention;
Fig. 4 is that in the temperature-controlled process of differentiating based on symbol in current-carrying capacity of cable circulating-heating test of the present invention, symbol weight is extracted subroutine flow chart;
Fig. 5 is that in the temperature-controlled process of differentiating based on symbol in current-carrying capacity of cable circulating-heating test of the present invention, symbol weight judges subroutine flow chart;
Fig. 6 is that in the temperature-controlled process of differentiating based on symbol in current-carrying capacity of cable circulating-heating test of the present invention, parameter is upgraded subroutine flow chart.
Embodiment
The present invention is made up of PLC (or single-chip microcomputer) control module, 12 hyperchannel AD AD conversion unit, I/O input-output unit, sensor and transducing unit, motor and pressure regulator performance elements on hardware; On software, judge that by initial parameter setting subroutine, AD data acquisition and filtering subroutine, symbol weight extraction subroutine, symbol weight subroutine, parameter renewal subroutine form.After hardware preliminary work completes, 0～200 DEG C of temperature signal (range can be selected different thermopairs according to wireline test upper temperature limit from user) is become 0～5V voltage signal by temperature sensor and transducing unit, 0～2000A current signal (range can be selected according to cable actual bearer scope from user) is become 0～5V voltage signal by current sensor and transducing unit, it is that (numerical value utilizes two byte representations, high-end alignment for 0～32000 digital quantity that temperature after conversion, current signal send 12 hyperchannel AD AD conversion unit to become scope, the highest 1bit is sign bit, middle 11bit is actual converted numerical value, minimum 4bit is invalid), after transforming numerical send PLC (or single-chip microcomputer) control module to process, obtain the symbolic information of controlling use, after symbolic information judgement, obtain execution undated parameter, control the rotating of pressure regulator motor through the IO output unit output of PLC (or single-chip microcomputer), realize the descending operation of cable current, the descending operation of cable current causes the eustasy of cable conductor temperature, through temperature sensor, after current sensor collection feedback, obtain sampled value, again sampled value is carried out extraction and the judgement of symbolic information, obtain new pressure regulator motor and carry out output quantity, proceed electric current descending operation, thereby this process of iterative cycles enters between equilibrium temperature setting area cable temperature fast.
Differentiating based on symbol the main method that realizes said process is:
The first step, sets up input signal symbolic feature model.Input signal symbolic feature model mainly comprises four characteristic informations, is defined as respectively: INPUT (rate of temperature change symbol
, target temperature symbol
, current changing rate symbol
, target current symbol
).Wherein, rate of temperature change
, target temperature
, current changing rate
, target current
symbolic feature parameter value territory be {+, 0 ,-}, wherein i represents 1 ... certain in N circulation is measured, and N is total cycle index.Symbol value function is defined as
(1)
Wherein, x is characteristic information variable quantity,
for setting value,
for the threshold value of setting value; "+" representation feature information is greater than the upper limit of setting value, and within the scope of the bound of " 0 " representation feature information in setting value, "-" representation feature information is less than the lower limit of setting value.
Total symbolic feature model codomain be (,-,-,-), (,-,-, 0), (,-,-,+) ..., (+, + ,+,+), the medium and small parenthetical term of braces is fixed reference feature codomain, has 81 kinds of different values.
Second step: the implication of definition input signal symbolic feature model.After input signal symbolic feature model value, the definition of symbolic feature model need to be carried out clearly.For simplified illustration, for the item of information that does not affect the judgement of signal code feature in signal code characteristic model, can replace with *, represent that its value can be "+", " 0 ", any value of symbol in "-".
Here, the typical input signal symbolic feature model value of using is as follows, INPUT
(-,-, *,-): temperature trend declines, and temperature is less than setting range, *, electric current is less than setting range;
(0 ,-, *,-): temperature trend is stable, and temperature is less than setting range, *, electric current is less than setting range;
(+,-, *,-): temperature trend rises, and temperature is less than setting range, *, electric current is less than setting range;
(-, 0, *,-): temperature trend decline, temperature in setting range, *, electric current is less than setting range;
(0,0, *,-): temperature trend is stable, temperature in setting range, *, electric current is less than setting range;
(+, 0, *,-): temperature trend rise, temperature in setting range, *, electric current is less than setting range;
(-,+, *,-): temperature trend declines, and temperature is greater than setting range, *, electric current is less than setting range;
(0 ,+, *,-): temperature trend is stable, and temperature is greater than setting range, *, electric current is less than setting range;
(+,+, *,-): temperature trend rises, and temperature is greater than setting range, *, electric current is less than setting range;
(-,-, *, 0): temperature trend declines, and temperature is less than setting range, *, and electric current is in setting range;
(0 ,-, *, 0): temperature trend is stable, and temperature is less than setting range, *, electric current is in setting range;
(+,-, *, 0): temperature trend rises, and temperature is less than setting range, *, and electric current is in setting range;
(-, 0, *, 0): temperature trend decline, temperature in setting range, *, electric current is in setting range;
(0,0, *, 0): temperature trend is stable, temperature in setting range, *, electric current is in setting range;
(+, 0, *, 0): temperature trend rise, temperature in setting range, *, electric current is in setting range;
(-,+, *, 0): temperature trend declines, and temperature is greater than setting range, *, and electric current is in setting range;
(0 ,+, *, 0): temperature trend is stable, and temperature is greater than setting range, *, electric current is in setting range;
(+,+, *, 0): temperature trend rises, and temperature is greater than setting range, *, and electric current is in setting range;
(-,-, * ,+): temperature trend declines, and temperature is less than setting range, *, electric current is greater than setting range;
(0 ,-, * ,+): temperature trend is stable, and temperature is less than setting range, *, electric current is greater than setting range;
(+,-, * ,+): temperature trend rises, and temperature is less than setting range, *, electric current is greater than setting range;
(-, 0, * ,+): temperature trend decline, temperature in setting range, *, electric current is greater than setting range;
(0,0, * ,+): temperature trend is stable, temperature in setting range, *, electric current is greater than setting range;
(+, 0, * ,+): temperature trend rise, temperature in setting range, *, electric current is greater than setting range;
(-,+, * ,+): temperature trend declines, and temperature is greater than setting range, *, electric current is greater than setting range;
(0 ,+, * ,+): temperature trend is stable, and temperature is greater than setting range, *, electric current is greater than setting range;
(+,+, * ,+): temperature trend rises, and temperature is greater than setting range, *, electric current is greater than setting range;
The 3rd step: the judgement of symbolic feature model.According to the difference of symbolic feature model value, determine that performing an action of electric machine actuating mechanism operates with the renewal of current parameters.In electric cable heating test, current value is controll plant, and the lifting of current value is decided by the rotating of pressure regulator motor.Therefore, according to the definition mode of input signal symbolic feature model, definition motor output symbol characteristic model, definition mode is: pressure regulator motor action symbol weight be OUT (
).Wherein, the codomain of OUT (M) is {+, 0 ,-}, and "+" represents pressure regulator motor forward, and " 0 " represents that pressure regulator motor is static, and "-" represents pressure regulator motor reversal.
OUT(M)=JudgeMotor[INPUT(
，
，
，
)] (2)
Here JudgeMotor[,] be motor output symbol deterministic process.Judge that calculating process is
OUT(M)=+=JudgeMotor[(*,*,*,-)] (3.1)
OUT(M)=-=JudgeMotor[(*,*,*,+)] (3.2)
OUT(M)=0=JudgeMotor[(*,*,*,0)] (3.3)
Formula (3.1) represents that target current is "-", needs motor forward up-flow; Formula (3.2) represents that target current is "+", needs motor reversal to fall stream; Formula (3.3) represents that target current is " 0 ", and motor is out of service.
Meanwhile, objective definition current parameters amendment symbolic model, definition mode is: target current amendment symbol weight is CHANGE (I).Wherein, the codomain of CHANGE (I) is {+, 0 ,-}, and "+" represents that target current increases, and " 0 " represents that target current is constant, and "-" represents that target current reduces.
CHANGE(I)=JudgeCurrent[INPUT(
，
，
)] (4)
Here JudgeCurrent[,] be target current parameter modification symbol decision process.Judge that calculating process is
CHANGE(I)=+=JudgeCurrent[(-,-,*,0) or (0,-,*,0)] (5.1)
CHANGE(I)=0=JudgeCurrent[(*,0,*,0) or (+,-,*,0) or (-,+,*,0)] (5.2)
CHANGE(I)=-=JudgeCurrent[(+,+,*,0) or (0,+,*,0))] (5.3)
Here, or represents " exclusive disjunction ".
When formula (5.1) represents that temperature is less than setting value, when temperature is steady or downtrending, must carry out electric current and increase operation; Formula (5.2) represents that temperature is in the time that setting value is interval, temperature be less than setting value but in the time of ascendant trend or temperature be greater than setting value but in the time of downtrending current value can keep initial value constant; Formula (5.3) represents that temperature is greater than setting value and in the time of ascendant trend or temperature is greater than setting value and in the time of stable tendency, current value is carried out and reduced operation.
The 4th step: target component renewal process.Target component renewal process comprises that target current upgrades and target temperature upgrades two subprocess.
Target current upgrades, and target current is to change according to certain rule according to initial current setting value, and constantly computing generates new target current value.Here, the Changing Pattern of target current value carries out according to " split ", and concrete assignment procedure is
(6.1)
(6.2)
(6.3)
(6.4)
Wherein,
for the current value of initial setting,
for the current value of current setting, it is that k primary current parameter is upgraded that k represents current,
for intermediate variable, MAX[] for getting large value function,
differentiate current value for the minimum in target current value renewal process, and is " with computing ".
The computing assignment procedure of formula (6.1) ~ formula (6.4) must be carried out in the unequal situation of new and old value, if equated, assignment procedure is cancelled, and each variable keeps original parameter.The object of this constraint EQ is to ensure carrying out smoothly of " split " computing.
When target current value
after renewal, repeat the 3rd step operation, thereby realize the fast and stable control of temperature in current-carrying capacity of cable heating process.
For the renewal of target temperature, can be by directly setting
value realizes, and makes it equal new target temperature value, repeats the 3rd step operation, can realize the automatic adjusting setting of different target temperature.
The 5th step, cyclic process control.According to cycle index N and single cycle working time
requirement, judge cycle index N and
whether mark completes, if not, repeats the 3rd step ~ five step, until cyclic process finishes, the hydronic control procedure of current-carrying capacity of cable finishes.
The 6th step, off-test, complete machine resets.After current-carrying capacity of cable circulating-heating control procedure finishes, pressure regulator motor is got back to zero-bit, and each power-on switch is in gate-dividing state, and Testing Software resets to original state, and prompting frame prompting process of the test stops.
Illustrate: first, determine before current-carrying capacity of cable circulating-heating test ready each test unit, determine wiring connect errorless, without just starting process of the test after reversal connection.In process of the test, it is the PLC of S7-224XP that controller is selected Siemens's model, ADC module is selected EM325, thermopair is selected T-shaped thermopair, and current transformer, transmitter, induction voltage regulator, strong current generator, stube cable etc. select routine to meet the universal models of current-carrying capacity heat test.Test cable per sample model is selected.
In PLC, configure AIW4, AIW6 passage is temperature acquisition passage, current acquisition passage.
Control as shown in Figure 1 general flow chart, comprise following concrete implementation step:
The first step: according to cable type, call initial parameter and set subroutine, initial parameter is set subroutine flow chart as shown in Figure 2.Setting target setting temperature in subroutine in initial parameter is 90 DEG C, and the cross-section of cable amasss as 300mm
2, cable maximum is born electric current 6000A, minimum electric current 20A, cycle index 10 times, 8 hours heating-up times, the temperature fall time 7 hours differentiated of cable.
Second step: according to the long-pending current coefficient of selecting of the cross-section of cable.Determine that current current coefficient is 2.5.Initial current value is 300*2.5=750A.Initial parameter is set and is finished.
The 3rd step: circulating-heating starts key-press status judgement.If do not started, wait for; Start to enter next step.
The 4th step: call AD data acquisition and filtering subroutine, as shown in Figure 3 AD data acquisition and filtering subroutine flow chart.In PLC, the temperature signal that AIW4 gathers, every 16 transient temperatures are averaged and obtain median-filtered result, use as temperature input signal; The current signal that AIW6 gathers, every 16 momentary currents are averaged and obtain median-filtered result, use as current input signal.AD gathers end.
The 5th step: call sign amount is extracted subroutine, symbol weight is extracted subroutine flow chart as shown in Figure 4.
Symbol weight judgment threshold Δ=1 DEG C of design temperature; Symbol weight judgment threshold Δ=0.5 of design temperature slope DEG C/min; Set the symbol weight judgment threshold Δ=10A of electric current; Set the symbol weight judgment threshold Δ=10A/s of electric current slope.According to formula 1
(1)
Computing, obtain temperature slope symbol, target temperature symbol, electric current slope symbol, target current symbol, be respectively
,
,
.
The 6th step: call sign amount judges subroutine, and symbol weight judges subroutine flow chart as shown in Figure 5.
Carry out pressure regulator motor action symbol according to formula 2 and obtain, concrete operation process adopts three computings in formula 3 to shine upon.
Wherein, formula 2 is
OUT(M)=JudgeMotor[INPUT(
，
，
，
)] (2)
Formula 3 is
OUT(M)=+=JudgeMotor[(*,*,*,-)] (3.1)
OUT(M)=-=JudgeMotor[(*,*,*,+)] (3.2)
OUT(M)=0=JudgeMotor[(*,*,*,0)] (3.3)
According to the output symbol of OUT (M), can determine the manner of execution immediately of motor.Wherein, OUT (M)=+, motor forward; OUT (M)=-, motor reversal; OUT (M)=0, motor stops.
Carry out target current parameter modification symbol decision according to formula 4, obtain CHANGE (I), three mappings in concrete operation process reference formula 5 complete.
Wherein, formula 4 is
CHANGE(I)=JudgeCurrent[INPUT(
，
，
)] (4)
Formula 5 is
CHANGE(I)=+=JudgeCurrent[(-,-,*,0) or (0,-,*,0)] (5.1)
CHANGE(I)=0=JudgeCurrent[(*,0,*,0) or (+,-,*,0) or (-,+,*,0)] (5.2)
CHANGE(I)=-= JudgeCurrent[(+,+,*,0) or (0,+,*,0))] (5.3)
The 7th step: call parameters is upgraded subroutine, parameter is upgraded subroutine flow chart as shown in Figure 6.
According to the speed requirement of temperature stabilization time, set delay time, call parameters is upgraded subroutine.The delay time of setting in the present embodiment is 30s, and 30s arrives call parameters and upgrades subroutine, and the timer that resets; 30s is less than entering the 8th step.
Target current renewal process is upgraded according to formula 6.
Wherein, 4 operational formulas in formula 6 are
(6.1)
(6.2)
(6.3)
(6.4)
Thereby obtain new target current.
Target temperature
generally, after initial parameter is set, do not make an amendment; While leaveing no choice but revise, can again in the time being recycled to this position, reset at every turn.
The 8th step, the heating-up time is to no, if the heating-up time to; enter temperature-fall period, do not return to the 3rd step.
The 9th step, enters temperature-fall period.
Temperature-fall period only need to carry out OUT (M)=-, allow pressure regulator motor reversal be reset to motor initial zero limit, now cable is in the natural state of cooling.Pressure regulator motor will be protected by travel switch after dropping to zero limit, will forbid that motor reversal only allows motor forward.
The tenth step, temperature fall time is to no, if temperature fall time to; enter next step, be less than and return to the 3rd step.
The 11 step, calls initial parameter value and sets subroutine, carries out initialization setting.
Owing to controling environment in continuous variation, control procedure and historical control procedure are irrelevant herein, so need re invocation initial parameter to set subroutine.
The 12 step, cycle index is to no, if cycle index to; exit circulating-heating process, enter next step, do not turn back to the 3rd step.
The 13 step, reset operation.
Reset operation is that pressure regulator motor is got back to zero-bit, and each power-on switch is in gate-dividing state, and Testing Software resets to original state, and prompting frame prompting process of the test stops.
The 14 step, off-test.
Claims (1)
1. a temperature-controlled process of differentiating based on symbol in the test of current-carrying capacity of cable circulating-heating, is characterized in that, specifically comprises the steps:
1) according to cable type, call initial parameter and set subroutine, set target setting temperature in subroutine in initial parameter, the cross-section of cable is long-pending, and cable maximum is born electric current, the minimum electric current of differentiating of cable, cycle index, heating-up time, temperature fall time, according to the long-pending current coefficient of selecting of the cross-section of cable, initial parameter is set and is finished;
2) circulating-heating starts key-press status judgement, if do not started, waits for; Start to enter next step;
3) call AD data acquisition and filtering subroutine, gather several transient temperatures and be averaged and obtain median-filtered result, use as temperature input signal; Gather several momentary currents and be averaged and obtain median-filtered result, as current input signal, AD gathers end;
4) call sign amount is extracted subroutine, the symbol weight judgment threshold of design temperature; The symbol weight judgment threshold of design temperature slope; Set the symbol weight judgment threshold of electric current; Set the symbol weight judgment threshold of electric current slope, according to formula 1 computing,
Formula 1 is
Wherein, x is characteristic information variable quantity,
for setting value,
for the threshold value of setting value; "+" representation feature information is greater than the upper limit of setting value, and within the scope of the bound of " 0 " representation feature information in setting value, "-" representation feature information is less than the lower limit of setting value; Obtain temperature slope symbol, target temperature symbol, electric current slope symbol, target current symbol by formula 1, be respectively
,
,
,
5) call sign amount judges subroutine, carry out pressure regulator motor action symbol according to formula 2 and obtain,
Formula 2 is
OUT(M)=JudgeMotor[INPUT(
，
，
，
)]，
Concrete operation process adopts three computings in formula 3 to shine upon,
Formula 3 is
OUT(M)=+=JudgeMotor[(*,*,*,-)]
OUT(M)=-=JudgeMotor[(*,*,*,+)]
OUT(M)=0=JudgeMotor[(*,*,*,0)]
According to the output symbol of OUT (M), obtain the manner of execution immediately of motor, wherein, OUT (M)=+, motor forward; OUT (M)=-, motor reversal; OUT (M)=0, motor stops, and * is for the item of information that does not affect the judgement of signal code feature in signal code characteristic model;
Carry out target current parameter modification symbol decision according to formula 4, obtain CHANGE (I),
Formula 4 is
CHANGE(I)=JudgeCurrent[INPUT(
，
，
)]
Three mappings in concrete operation process reference formula 5 complete,
Formula 5 is
CHANGE(I)=+=JudgeCurrent[(-,-,*,0) or (0,-,*,0)]
CHANGE(I)=0=JudgeCurrent[(*,0,*,0) or (+,-,*,0) or (-,+,*,0)]
CHANGE(I)=-= JudgeCurrent[(+,+,*,0) or (0,+,*,0))] ；
6) call parameters is upgraded subroutine, according to the speed requirement of temperature stabilization time, sets delay time, and call parameters is upgraded subroutine, the delay time of setting, and delay time arrives call parameters and upgrades subroutine, and the timer that resets; Delay time is less than entering step 7), and target current upgrades according to formula 6 computing assignment procedures and upgrades:
Formula 6 is
，
Wherein,
for the current value of initial setting,
for current goal current value, it is that k primary current parameter is upgraded that k represents current,
for intermediate variable, MAX[] for getting large value function,
differentiate current value for the minimum in target current value renewal process, and is " with computing ", target temperature
generally, after initial parameter is set, do not make an amendment; While leaveing no choice but revise, can again in the time being recycled to this position, reset at every turn;
7) heating-up time is to no, if the heating-up time to; enter next step temperature-fall period, do not return to step 2);
8) enter temperature-fall period: temperature-fall period only need to carry out OUT (M)=-, allow pressure regulator motor reversal be reset to initial zero limit of motor, pressure regulator motor will be protected by travel switch after dropping to zero limit, will forbid that motor reversal only allows motor forward;
9) temperature fall time is to no, if temperature fall time to; enter next step, be less than and return to step 2);
10) call initial parameter value and set subroutine, carry out initialization setting again;
11) cycle index is to no, if cycle index to; exit circulating-heating process, enter next step, do not turn back to step 2);
12) reset operation, pressure regulator motor is got back to zero-bit, and each power-on switch is in gate-dividing state, and Testing Software resets to original state, and prompting frame prompting process of the test stops;
13) off-test.
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| CN103135635B (en) * | 2013-03-04 | 2014-12-17 | 上海理工大学 | Current control temperature method based on global position system (GPS) space-time compensation |
| CN104573394B (en) * | 2015-01-27 | 2017-06-16 | 西华大学 | The accurate acquisition methods of power cable system thermal model characteristic parameter |
| CN110095696B (en) * | 2019-06-14 | 2021-04-23 | 广东电网有限责任公司 | Cable current-carrying capacity adjusting method, device, equipment and readable storage medium |
| CN110352855B (en) * | 2019-08-15 | 2021-08-24 | 青岛大牧人机械股份有限公司 | Intelligent heating system for piglet heat preservation area and control method thereof |
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| CN101672880A (en) * | 2009-09-21 | 2010-03-17 | 广东电网公司广州供电局 | Identification method of cable current-carrying capacity and identification device |
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| CN101672880A (en) * | 2009-09-21 | 2010-03-17 | 广东电网公司广州供电局 | Identification method of cable current-carrying capacity and identification device |
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