CN102707745A - 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 differentiating based on symbol in particularly a kind of current-carrying capacity of cable circulation heat test.
Background technology
In the power cable test, the current-carrying capacity-temperature relation of cable has directly reacted the operating characteristic and the actual current capacity that allows of cable.According to the IEC60364 of International Electrotechnical Commission standard code, insulating material is the cable of PVC (PVC), and conductor temperature is limited to 70 ℃; Crosslinked polyethylene (XPLE) and ethylene-propylene compound (EPR) cable, conductor temperature is limited to 90 ℃; Mineral not near bare cable, conductor temperature is limited to 105 ℃.Implement the heat test of current-carrying capacity circulation fast to dissimilar cables, reach the upper temperature limit of cable permission and keep the main contents that became at least 2 hours in the current cable data test.In test in the past; Scientific research institution adopts the current value that calculates with the rated current-carrying capacity computing formula stipulated in the IEC60287 standard or its deformation formula as a reference; Thereby manual adjustments cable loading current value realizes cable temperature and progressively is stabilized to the method for design temperature, adjusting, computation process complicacy, loaded down with trivial details, and process of the test is subject to the influence of personnel and environment; Stablizing effect and control accuracy are not high when long, and the adjusted value of different temperatures changes very difficulty.Number of patent application CN200810048229.7 discloses a kind of power cable conductor temperature automatic following and control method, through accounting temperature rate of change, temperature stabilization characteristic, obtain the electric current adjusting range according to current setting value, reaches the purpose that temperature is followed the tracks of.This method has realized temperature controlled robotization in the cable heating process to a certain extent; But do not consider noise and the mechanism of target current modification and the generality of the amplitude of modification in the measuring process; The control procedure robustness is not enough, and the transit time of temperature stabilization is longer.Application for a patent for invention CN200910192506.6 discloses a kind of definite method of current-carrying capacity of cable and has confirmed device; Through setting the initial value of cable conductor electric current, temperature; The final equilibrium temperature of calculating conductor; Through continuous iteration correcting current, temperature value, finally reach stable upper temperature limit, realize confirming of current-carrying capacity of cable.Though this method confirms that it still is the process that a kind of temperature trial approaches that exercisable test method, its control procedure are provided, whole adjustment overlong time to the actual permission of cable current-carrying capacity.
Summary of the invention
The present invention be directed to the problem that the temperature stabilization time is long in the current-carrying capacity of cable circulation heat test, control accuracy is not high; The temperature-controlled process differentiated based on symbol has been proposed in a kind of current-carrying capacity of cable circulation heat test; It is temperature stabilization control method fast in a kind of current-carrying capacity of cable circulation heat test; Extract the characteristic parameter of reflection temperature changing trend in the measuring process, utilize its symbol characteristic to make the temperature control decision, realize temperature stabilization control fast; Improve the robustness of control procedure, reduce sluggishness, hyperharmonic reforming phenomena in the temperature controlled processes.
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 circulation heat test specifically comprises the steps:
1) according to cable type, call initial parameter and set subroutine, set target setting temperature in the subroutine in initial parameter; The cross-section of cable is long-pending, and the 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) circulation heating beginning key-press status is judged, if do not begin, waits for; Beginning then gets into next step;
3) call AD data acquisition and filtering subroutine, gather several transient temperatures and make even and all obtain median-filtered result, use as temperature input signal; Gather several momentary currents and make even and all obtain median-filtered result, as current input signal, AD gathers end;
4) the 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 current slope, according to formula 1 computing,
Formula 1 does
Where, x is the amount of change characteristic information,
set value,
the set threshold value;" + "indicates the feature information than the set upper limit value," 0 "indicates that the feature information is set within the upper and lower limit values, "-" indicates that the feature information is smaller than the lower limit set value; temperature slope obtained by the formula 1 symbols, symbol target temperature, the current slope symbols, target current symbol, namely
,
,
,
5) the call sign amount is judged subroutine, carry out pressure regulator motor action symbol according to formula 2 and obtain,
Formula 2 does
OUT(M)=JudgeMotor[INPUT(
，
，
，
)]，
The concrete operation process adopts three computing mappings in the formula 3 to accomplish,
Formula 3 does
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 just changes; OUT (M)=-, the motor counter-rotating; OUT (M)=0, motor stops, and * is for not influencing signal code characteristic information judged item in the signal code characteristic model;
Carry out target current parameter modification symbol decision according to formula 4, obtain CHANGE (I),
Formula 4 does
CHANGE(I)=JudgeCurrent[INPUT(
，
，
)]
The concrete operation process is accomplished with reference to three in the formula 5 mappings,
Formula 5 does
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, and the delay time of setting, delay time arrive then call parameters renewal subroutine, and the timer that resets; Delay time is less than then getting into step 7), and the target current renewal process is upgraded according to formula 6,
4 operational formulas in the formula 6 are:
Wherein,
is the current value of initial setting;
is the current value of current setting; K representes that current is k primary current parameter update;
is intermediate variable; MAX [] is for getting big value function;
is that the minimum in the target current value renewal process is differentiated current value; And is " with computing "; Target temperature
generally after initial parameter is set, is not made an amendment; When leaveing no choice but revise, can when being recycled to this position, reset again at every turn;
7) heating-up time is not to, if the heating-up time to get into next step temperature-fall period, then do not return step 2);
8) get into temperature-fall period: temperature-fall period only need carry out OUT (M)=-, let the counter-rotating of pressure regulator motor be reset to initial zero limit of motor and get final product, the pressure regulator motor will be protected by travel switch after dropping to zero limit, will forbid that motor reverses only to allow motor just to change;
9) temperature fall time is not to, if temperature fall time to get into next step, be less than and then return step 2);
10) call initial parameter value and set subroutine, carry out initialization setting once more;
11) cycle index is not to, if cycle index to withdraw from circulation heating process, get into next step, then do not turn back to step 2);
12) reset operation, the pressure regulator motor is got back to zero-bit, and each power-on switch is in gate-dividing state, and the test software reset is 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 the current-carrying capacity of cable circulation heat test of the present invention; Can realize that cable conductor temperature fast and stable is to setting value in the current-carrying capacity of cable circulation heat test; Temperature controlled processes has robustness preferably; Temperature overshoot and concussion are suppressed; That whole control process realizes is simple, operand is few, steering logic is clear and definite, can be widely used in conductor temperature control or has in the constant control of slow varying parameter of similar demand.
Description of drawings
The temperature-controlled process control general flow chart of Fig. 1 for differentiating based on symbol in the current-carrying capacity of cable circulation heat test of the present invention;
Fig. 2 sets subroutine flow chart for initial parameter in the temperature-controlled process of differentiating based on symbol in the current-carrying capacity of cable circulation heat test of the present invention;
Fig. 3 is AD data acquisition and filtering subroutine flow chart in the temperature-controlled process of differentiating based on symbol in the current-carrying capacity of cable circulation heat test of the present invention;
Fig. 4 extracts subroutine flow chart for symbol weight in the temperature-controlled process of differentiating based on symbol in the current-carrying capacity of cable circulation heat test of the present invention;
Fig. 5 judges subroutine flow chart for symbol weight in the temperature-controlled process of differentiating based on symbol in the current-carrying capacity of cable circulation heat test of the present invention;
Fig. 6 is parameter update subroutine flow chart in the temperature-controlled process of differentiating based on symbol in the current-carrying capacity of cable circulation heat test of the present invention.
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, form by initial parameter setting subroutine, AD data acquisition and filtering subroutine, symbol weight extraction subroutine, symbol weight judgement subroutine, parameter update subroutine.After hardware preliminary work is accomplished; Temperature sensor and transducing unit become 0～5V voltage signal with 0～200 ℃ of temperature signal (range can be selected different thermopairs according to the wireline test upper temperature limit by the user); Current sensor and transducing unit become 0～5V voltage signal with 0～2000A current signal (range can be selected according to cable actual bearer scope by the user); It is that (numerical value utilizes two byte representations, high-end alignment for 0～32000 digital quantity that temperature after the conversion, current signal send 12 hyperchannel AD AD conversion units to become scope; The highest 1bit is a sign bit, and middle 11bit is an actual converted numerical value, and minimum 4bit is invalid); After transforming numerical send PLC (or single-chip microcomputer) control module to handle, obtain the symbolic information of control usefulness, after symbolic information is judged, obtain the 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 that the up-down of cable conductor temperature changes, and after temperature sensor, current sensor collection feedback, obtains sampled value; Again sampled value is carried out the extraction and the judgement of symbolic information; Obtain new pressure regulator motor and carry out output quantity, proceed the electric current descending operation, thereby this process that circulates repeatedly makes cable temperature get into fast between the equilibrium temperature setting area.
Differentiating the main method that realizes said process based on symbol is:
The first step is set up input signal symbolic feature model.Input signal symbolic feature model mainly comprises four characteristic informations; Be defined as respectively: INPUT (rate of temperature change symbol
; Target temperature symbol
; Current changing rate symbol
, target current symbol
).Wherein, The symbolic feature parameter value territory of rate of temperature change
, target temperature
, current changing rate
, target current
be+; 0;-; Wherein i represents 1 ... In N the circulation certain is measured, and N is total cycle index.Being defined as of symbol value function
Wherein, X is the characteristic information variable quantity;
is setting value, and
is the threshold value of setting value; "+" representation feature information is greater than the upper limit of setting value, and " 0 " representation feature information is in the bound scope of setting value, and "-" 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 the fixed reference feature codomain, has 81 kinds of different values.
Second step: the implication of definition input signal symbolic feature model.After the input signal symbolic feature model value, the definition of symbolic feature model need be carried out clearly.Be simplified illustration,, can replace that representing its value can be "+", " 0 ", any value of symbol in "-" with * for not influencing signal code characteristic information judged item in the signal code characteristic model.
Here, the typical input signal symbolic feature model value of using is following, INPUT
(-,-, *,-): temperature trend descends, 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 descends, 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 rises, temperature in setting range, *, electric current is less than setting range;
(-,+, *,-): temperature trend descends, 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 descends, 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, *, and 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 descends, 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 rises, temperature in setting range, *, electric current is in setting range;
(-,+, *, 0): temperature trend descends, 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, *, and 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 descends, 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 descends, 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 rises, temperature in setting range, *, electric current is greater than setting range;
(-,+, * ,+): temperature trend descends, 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, the renewal operation of the execution action of decision electric machine actuating mechanism and current parameters.In the cable heat test, current value is a controll plant, and the up-down of current value is decided by the rotating of pressure regulator motor.Therefore; Definition mode according to input signal symbolic feature model; Definition motor output symbol characteristic model, definition mode is: pressure regulator motor action symbol weight is OUT (
).Wherein, the codomain of OUT (M) is {+, 0 ,-}, and "+" expression pressure regulator motor just changes, and " 0 " expression pressure regulator motor is static, the counter-rotating of "-" expression pressure regulator motor.
OUT(M)=JudgeMotor[INPUT(
，
，
，
)]?(2)
Here, JudgeMotor [] is a motor output symbol deterministic process.Judge that calculating process does
OUT(M)=+=JudgeMotor[(*,*,*,-)] (3.1)
OUT(M)=-=JudgeMotor[(*,*,*,+)] (3.2)
OUT(M)=0=JudgeMotor[(*,*,*,0)] (3.3)
Formula (3.1) expression target current is "-", needs motor just changeing up-flow; Formula (3.2) expression target current is "+", needs the motor counter-rotating to fall stream; Formula (3.3) expression target current is " 0 ", and motor is out of service.
Simultaneously, the objective definition current parameters is revised symbolic model, and definition mode is: it is CHANGE (I) that target current is revised symbol weight.Wherein, the codomain of CHANGE (I) is {+, 0 ,-}, and "+" expression target current increases, and " 0 " expression target current is constant, and "-" expression target current reduces.
CHANGE(I)=JudgeCurrent[INPUT(
，
，
)]?(4)
Here, JudgeCurrent [] is a target current parameter modification symbol decision process.Judge that calculating process does
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 representes " exclusive disjunction ".
When formula (5.1) is represented temperature less than setting value, must carry out electric current when temperature is steady or downtrending and increase operation; Formula (5.2) expression temperature when setting value is interval, temperature less than setting value but when being in ascendant trend or temperature greater than setting value but when being in downtrending current value can keep initial value constant; Formula (5.3) expression temperature greater than setting value and when being in ascendant trend or temperature greater than setting value and when being in stable tendency, current value is carried out and is reduced operation.
The 4th step: target component renewal process.The target component renewal process comprises that target current upgrades and target temperature upgrades two sub-processes.
Target current upgrades, and target current is to change according to certain rule according to the 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 does
Wherein,
is the current value of initial setting;
is the current value of current setting; K representes that current is k primary current parameter update;
is intermediate variable; MAX [] is for getting big value function;
is that the minimum in the target current value renewal process is differentiated current value, and and is " with computing ".
The computing assignment procedure of formula (6.1) ~ formula (6.4) must be carried out under the unequal situation of new and old value, if equate, and the assignment procedure cancellation, each variable keeps original parameter.The purpose of this assignment constraint is to guarantee carrying out smoothly of " split " computing.
After target current value
renewal finishes; Repeat the operation of the 3rd step, thereby realize the fast and stable control of temperature in the current-carrying capacity of cable heating process.
Renewal for target temperature; Can be worth realization through directly setting
; Make it equal new target temperature value; Repeat the operation of the 3rd step, then can realize the automatic adjusting setting of different target temperature.
The 5th step, cyclic process control.Requirement according to cycle index N and single cycle working time
; Judge whether cycle index N and
sign is accomplished; If not would repeat the 3rd the step ~ the five the step; Finish up to cyclic process, then 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 circulation heating control procedure finished, the pressure regulator motor was got back to zero-bit, and each power-on switch is in gate-dividing state, and the test software reset is to original state, and prompting frame prompting process of the test stops.
Illustrate: at first, confirm that current-carrying capacity of cable circulation heat test is preceding ready with each test unit, confirm just can begin process of the test after wiring connects errorless, no reversal connection.In the process of the test; It is the PLC of S7-224XP that controller is selected Siemens's model for use; The ADC module is selected EM325 for use; Thermopair is selected T type thermopair for use, and the universal models that current transformer, transmitter, induction voltage regulator, strong current generator, stube cable etc. select for use routine to satisfy the current-carrying capacity heat test gets final product.Test cable model is per sample selected.
Dispose AIW4 among the PLC, the AIW6 passage is temperature acquisition passage, current acquisition passage.
Control general flow chart as shown in Figure 1 comprises following practical implementation step:
The first step: according to cable type, call initial parameter and set subroutine, initial parameter as shown in Figure 2 is set subroutine flow chart.The target setting temperature is 90 ℃ in initial parameter setting subroutine, and the cross-section of cable is long-pending to be 300mm
2, the 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.Confirm 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: circulation heating beginning key-press status is judged.If do not begin, wait for; Beginning then gets into next step.
The 4th step: call AD data acquisition and filtering subroutine, AD data acquisition as shown in Figure 3 and filtering subroutine flow chart.In PLC, the temperature signal that AIW4 gathers, per 16 transient temperatures are made even and are all obtained median-filtered result, use as temperature input signal; The current signal that AIW6 gathers, per 16 momentary currents are made even and are all obtained median-filtered result, use as current input signal.AD gathers end.
The 5th step: the call sign amount is extracted subroutine, and symbol weight as shown in Figure 4 is extracted subroutine flow chart.
The symbol weight judgment threshold Δ of design temperature=1 ℃; The symbol weight judgment threshold Δ=0.5 ℃/min of design temperature slope; Set the symbol weight judgment threshold Δ=10A of electric current; Set the symbol weight judgment threshold Δ=10A/s of current slope.According to formula 1
Computing; Obtain temperature slope symbol, target temperature symbol, current slope symbol, target current symbol; Be respectively
;
,
.
The 6th step: the call sign amount is judged subroutine, and symbol weight as shown in Figure 5 is judged subroutine flow chart.
Carry out pressure regulator motor action symbol according to formula 2 and obtain, the concrete operation process adopts three computing mappings in the formula 3 to accomplish.
Wherein, formula 2 does
OUT(M)=JudgeMotor[INPUT(
，
，
，
)] (2)
Formula 3 does
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 just changes; OUT (M)=-, the motor counter-rotating; OUT (M)=0, motor stops.
Carry out target current parameter modification symbol decision according to formula 4, obtain CHANGE (I), the concrete operation process is accomplished with reference to three in the formula 5 mappings.
Wherein, formula 4 does
CHANGE(I)=JudgeCurrent[INPUT(
，
，
)]?(4)
Formula 5 does
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 update 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 then call parameters renewal subroutine, and the timer that resets; 30s is less than then getting into for the 8th step.
The target current renewal process is upgraded according to formula 6.
Wherein, 4 operational formulas in the formula 6 do
(6.4)
Thereby obtain new target current.
Target temperature
generally after initial parameter is set, is not made an amendment; When leaveing no choice but revise, can when being recycled to this position, reset again at every turn.
In the 8th step, the heating-up time is not to, if the heating-up time to get into temperature-fall period, then do not return for the 3rd step.
In the 9th step, get into temperature-fall period.
Temperature-fall period only need carry out OUT (M)=-, let pressure regulator motor counter-rotating be reset to initial zero limit of motor and get final product, cable is in the natural cooling state at this moment.The pressure regulator motor will be protected by travel switch after dropping to zero limit, will forbid that the motor counter-rotating only allows motor just to change.
In the tenth step, temperature fall time is not to, if temperature fall time to get into next step, be less than and then returned for the 3rd step.
The 11 step, call initial parameter value and set subroutine, carry out the initialization setting.
Owing to control environment in continuous variation, control procedure and historical control procedure are irrelevant here, set subroutine so need call initial parameter again.
In the 12 step, cycle index is not to, if cycle index to withdraw from circulation heating process, get into next step, then do not turn back to for the 3rd step.
The 13 step, reset operation.
Reset operation is got back to zero-bit for the pressure regulator motor, and each power-on switch is in gate-dividing state, and the test software reset is to original state, and prompting frame prompting process of the test stops.
The 14 step, off-test.
Claims (1)
1. the temperature-controlled process of differentiating based on symbol in the current-carrying capacity of cable circulation heat test is characterized in that, specifically comprises the steps:
1) according to cable type, call initial parameter and set subroutine, set target setting temperature in the subroutine in initial parameter; The cross-section of cable is long-pending, and the 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) circulation heating beginning key-press status is judged, if do not begin, waits for; Beginning then gets into next step;
3) call AD data acquisition and filtering subroutine, gather several transient temperatures and make even and all obtain median-filtered result, use as temperature input signal; Gather several momentary currents and make even and all obtain median-filtered result, as current input signal, AD gathers end;
4) the 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 current slope, according to formula 1 computing,
Formula 1 does
Where, x is the amount of change characteristic information,
set value,
the set threshold value; "+" indicates the feature information than the set upper limit value, "0" indicates the feature information in the upper and lower limit set value, the "-" indicates that the feature information is smaller than the lower limit set value; temperature slope obtained by the formula 1 symbols, symbol target temperature, the current slope symbols, target current symbol, namely
,
,
,
5) the call sign amount is judged subroutine, carry out pressure regulator motor action symbol according to formula 2 and obtain,
Formula 2 does
OUT(M)=JudgeMotor[INPUT(
，
，
，
)]，
The concrete operation process adopts three computing mappings in the formula 3 to accomplish,
Formula 3 does
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 just changes; OUT (M)=-, the motor counter-rotating; OUT (M)=0, motor stops, and * is for not influencing signal code characteristic information judged item in the signal code characteristic model;
Carry out target current parameter modification symbol decision according to formula 4, obtain CHANGE (I),
Formula 4 does
CHANGE(I)=JudgeCurrent[INPUT(
，
，
)]
The concrete operation process is accomplished with reference to three in the formula 5 mappings,
Formula 5 does
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, and the delay time of setting, delay time arrive then call parameters renewal subroutine, and the timer that resets; Delay time is less than then getting into step 7), and the target current renewal process is upgraded according to formula 6,
4 operational formulas in the formula 6 are:
Wherein,
is the current value of initial setting;
is the current value of current setting; K representes that current is k primary current parameter update;
is intermediate variable; MAX [] is for getting big value function;
is that the minimum in the target current value renewal process is differentiated current value; And is " with computing "; Target temperature
generally after initial parameter is set, is not made an amendment; When leaveing no choice but revise, can when being recycled to this position, reset again at every turn;
7) heating-up time is not to, if the heating-up time to get into next step temperature-fall period, then do not return step 2);
8) get into temperature-fall period: temperature-fall period only need carry out OUT (M)=-, let the counter-rotating of pressure regulator motor be reset to initial zero limit of motor and get final product, the pressure regulator motor will be protected by travel switch after dropping to zero limit, will forbid that motor reverses only to allow motor just to change;
9) temperature fall time is not to, if temperature fall time to get into next step, be less than and then return step 2);
10) call initial parameter value and set subroutine, carry out initialization setting once more;
11) cycle index is not to, if cycle index to withdraw from circulation heating process, get into next step, then do not turn back to step 2);
12) reset operation, the pressure regulator motor is got back to zero-bit, and each power-on switch is in gate-dividing state, and the test software reset is to original state, and prompting frame prompting process of the test stops;
13) off-test.
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Cited By (4)
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| CN103135635A (en) * | 2013-03-04 | 2013-06-05 | 上海理工大学 | Current control temperature method based on global position system (GPS) space-time compensation |
| CN104573394A (en) * | 2015-01-27 | 2015-04-29 | 西华大学 | Method of accurately acquiring characteristic parameters of power cable system thermal model |
| CN110095696A (en) * | 2019-06-14 | 2019-08-06 | 广东电网有限责任公司 | A kind of current-carrying capacity of cable method of adjustment, device, equipment and readable storage medium storing program for executing |
| CN110352855A (en) * | 2019-08-15 | 2019-10-22 | 青岛大牧人机械股份有限公司 | A kind of piglet heat-insulation region intelligent heating system and its control method |
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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 |
| CN202141770U (en) * | 2011-07-22 | 2012-02-08 | 山东电力集团公司德州供电公司 | Cable current-carrying capacity calculating and early warning system based on distributed fiber temperature measurement |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103135635A (en) * | 2013-03-04 | 2013-06-05 | 上海理工大学 | Current control temperature method based on global position system (GPS) space-time compensation |
| CN104573394A (en) * | 2015-01-27 | 2015-04-29 | 西华大学 | Method of accurately acquiring characteristic parameters of power cable system thermal model |
| CN104573394B (en) * | 2015-01-27 | 2017-06-16 | 西华大学 | The accurate acquisition methods of power cable system thermal model characteristic parameter |
| CN110095696A (en) * | 2019-06-14 | 2019-08-06 | 广东电网有限责任公司 | A kind of current-carrying capacity of cable method of adjustment, device, equipment and readable storage medium storing program for executing |
| CN110352855A (en) * | 2019-08-15 | 2019-10-22 | 青岛大牧人机械股份有限公司 | A kind of piglet heat-insulation region intelligent heating system and its control method |
| 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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| CN102707745B (en) | 2014-07-23 |
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