CN109884398A - A kind of device and its measurement method of the resistance of precise measurement electroslag clinker - Google Patents
A kind of device and its measurement method of the resistance of precise measurement electroslag clinker Download PDFInfo
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Abstract
The invention discloses a kind of device of precise measurement electroslag clinker resistance and, including signal sampling input unit, signal acquisition computing device, signal output apparatus；The voltage and current signal that signal sampling input unit comes is calculated by digital signal processor, and passes through the filtering of filter module, AD conversion module AD conversion；D/A conversion module DA conversion；After calibration module calibration；And resistance value of slagging tap is calculated by digital signal processor, it is transmitted finally by communication module；It being capable of accurate slag resistance value；Precision can reach a ten thousandth；Electromagnetism interference performance is good, avoids D/A repeatedly, the advantages that A/D conversion causes transformed error, solve the problems, such as power supply it is non-linear caused by higher hamonic wave bring slag resistance computational problem and power supply voltage and current caused by reactance component it is out of phase, calculate that resistance value is inaccurate, thus the technical issues of influencing the permanent melting speed control of electroslag furnace.
Description
Technical field
The device hindered the present invention relates to metallurgical technology field more particularly to a kind of precise measurement electroslag clinker and its measurement side
Method.
Background technique
Electroslag furnace, as heat generating components heat, is melted by refining electrode, in fusion process, electrode connects with electroslag using electroslag
The surface melting of touching is one layer of metallic film, and metal film forms tiny molten one by one under the action of surface tension and gravity
Drop, these molten drops are adsorbed impurity, or incorporation useful element by electroslag, eventually fall into spindle molten bath, controlled crystallisation by cooling
And form pure and isotropic metal or alloy material.Since heater element is the electroslag of fusing, in entire fusion process
Middle electroslag can be consumed, and chemical component can also change, so the slag resistance of electroslag is changing at any time, to guarantee melting rate
Constant (permanent melting speed control) needs to grasp the variation of slag resistance at any time, adjusts control parameter in time, also need to prompt to be added when necessary
New slag.
The electroslag furnace of mainstream is all both at home and abroad at present or slag is calculated using effective value to be hindered, and does not consider
The influence that the non-linear caused higher hamonic wave of power supply hinders calculated slag, also not accounting for reactance component in power supply causes
The different phases of voltage and current and then influence the permanent melting speed control of electroslag furnace so the slag resistance deviation calculated is bigger.
So to design a kind of device of precise measurement electroslag clinker resistance, the non-linear caused higher hamonic wave band of power supply is solved with this
The slag come hinders the problem of calculating, and solves the problems, such as the out of phase of voltage and current caused by reactance component in power supply, calculates resistance
It is worth inaccurate problem, thus the technical issues of influencing the permanent melting speed control of electroslag furnace.
Summary of the invention
In place of according to above-mentioned the deficiencies in the prior art, the present invention realizes a kind of precise measurement electroslag
The device of clinker resistance, including signal sampling input unit, signal acquisition computing device, signal output apparatus；
The signal sampling input unit further includes melting power supply, voltage transformer, current transformer；The voltage
One end of mutual inductor is connected on melting power supply by the channel PSV01, the channel PSV02；The other end of the voltage transformer
The filter module is connected to by the channel AV01, the channel AV02；After the current transformer passes through mutual inductor, pass through
The channel AL01, the channel AL02 are connected to filter module；
The signal acquisition computing device includes digital signal processor, filter module, AD conversion module；The number
Word signal processor is connected by the channel LPSDP01, the channel LPSDP02, the channel LPSDP03, the channel LPSDP04 and filter module
It connects；The digital signal processor by the channel ADSDP01, the channel ADSDP02, the channel ADSDP03, the channel ADSDP04 with
AD conversion module connection；Filter module described in the DSP CONTROL and the AD conversion module carry out
The overall process of AD conversion issues to fixed time interval starting conversion and reads the control signal of data, and voltage and current signals are read
It is synchronous to carry out；
The signal output apparatus further includes D/A conversion module, calibration module, communication module；At the digital signal
Reason device is connected by the channel SDPDA01, the channel SDPDA02 with D/A conversion module, and it is defeated to convert the digital signal processor
Current signal out；The digital signal processor is connected by the channel SDPDA03, the channel SDPDA04 with D/A conversion module
It connects, converts the voltage signal of the digital signal processor output；The D/A conversion module passes through the channel OAI01, OAI02
Channel is connected with the calibration module；For calibrating the current signal of the digital signal processor output；Described
D/A conversion module is connected by the channel OVI03, the channel OVI04 with the calibration module；For calibrating the number letter
The voltage signal of number processor output；
The digital signal processor is connected by the channel PFB01, the channel PFB02 with profibus communication module；
The profibus communication module is connected with by profibus with VPC3 chip, and digital signal processor writes calculating data
Enter in VPC3 chip.
Further, the digital signal processor, filter module, AD conversion module, D/A conversion module, calibration module,
Communication module is connect with power module, provides power supply.
Further, the digital signal processor is dsp processor.
Further, the channel AV01 on the filter module, the channel AV02 input value are exchange 0V-5V analog quantity；Institute
The channel AL01, the channel AL02 on the filter module stated are 4mA-20mA analog quantity.
Meanwhile a kind of measurement method of the device of precise measurement electroslag clinker resistance is additionally provided in the technical scheme,
It is characterized in that, mainly comprises the steps that
Step S10: initialize the external equipment of digital signal processor: initialize filter module the channel LPSDP01,
The channel LPSDP02, the channel LPSDP03, the channel LPSDP04 numerical value be set as 0000；The channel ADSDP01 of AD conversion module,
The channel ADSDP02, the channel ADSDP03, the channel ADSDP04 numerical value be set as the channel SDPDA01 of 0000, D/A conversion module,
The channel SDPDA02, the channel SDPDA03, the channel SDPDA04 numerical value be set as 0000；The channel PFB01 of communication module, PFB02
The numerical value in channel is arranged to 00；After being provided with, S20 is entered step；
Step S20: starting timer: the timer of digital signal processor is opened, the timing in sampling time is carried out；It opens
S30 is entered step after beginning；
Step S30: it sampling time judgement: when the timer of digital signal processor is greater than the sampling time, enters step
S40；: when digital signal processor timer be less than the sampling time, enter step S20；
Step S40: starting AD data conversion: digital signal processor by the channel LPSDP01, the channel LPSDP02,
Data conversion trigger pulse, AD conversion is arranged according to the timer time in step S30 in the channel LPSDP03, the channel LPSDP04
Frequency of the module according to trigger pulse, the voltage and current signals that voltage transformer, current transformer are acquired, by filtering mould
After block, carries out analog signal and be converted into digital signal；And by the channel ADSDP01, the channel ADSDP02, the channel ADSDP03,
ADSDP04 channel transfer is to digital signal processor；After sampling time reaches, S50 is entered step；
Step S50: reading data: the digital signal in step S40 be deposited in digital signal processor, after the completion,
Enter step S60；
Step S60: judge data amount check: until entering step after reaching 96 data in digital signal processor
S70,
Step S70: voltage, electric current FFT are calculated: by the channel FFT on digital signal processor, according to fast Fourier
The formula of transformation enters step S80 after carrying out voltage, electric current conversion；
Step S80: calculating current, voltage effective value: effective by carrying out the voltage after converting in step S70, electric current
Value calculates, and after calculating electric current, voltage effective value, enters step S90；
Step S90: it calculates active power: being calculated according to P=U*I*cos (φ 1- φ 2) formula, wherein U and I is respectively to count
Voltage, the current effective value of calculating calculate voltage, current effective value according to 1/1.414* voltage and current maximum value；φ 1 is
Calculated current phase, φ 2 are calculated voltage-phase, and guarantee phase difference is positive value, are taken absolute value after calculating；Into step
Rapid S100；
Step S100: it calculates slag and hinders resistance value: by the arithmetic unit on digital signal processor, hindering R=according to formula slag
P/I2 calculates resistance value of slagging tap；Enter step S110；
Step S110: slag hinders resistance value transmission, by the slag resistance value in step S110, VPC3 chip is written and sends buffer area and DA
Converter, the data of write-in VPC3 chip are realized automatically by VPC3 chip to be communicated with main website；Enter step S120；
Step S120: resetting timer: after completing step S110, after the timer resetting on digital signal processor,
Return to step S20.
Above-mentioned technical solution, mainly solves following problems: (1) linear characteristic is hindered based on slag, it can be by voltage, electric current
Fundametal compoment as calculate slag resistance foundation；(2) consider the different phases of voltage, current first harmonics, obtained real part is slag
Resistance value；(3) directly the data transfer that slag hinders is set to main control device, including the controls such as PLC or industrial personal computer by digital link
It is standby.
Fast Fourier Transform is used in the technical scheme, separates the fundametal compoment of plug for outlet voltage and melting electric current,
The fundametal compoment of voltage and current generally has orthogonal real part and empty step, and the real part obtained after the vector value of voltage and current is divided by is i.e.
For slag resistance value.
There is advantage following prominent in the technical program: 1) voltage, electric current being isolated using high-speed digital video camera technology
Fundametal compoment, accurate slag resistance value；Precision can reach a ten thousandth；2) electromagnetism interference performance is good, protects in forceful electric power magnetic environment
Demonstrate,prove the accuracy and reliability of signal；3) it is different from conventional slag resistance transmitter to be transmitted to slag resistance value by 4-20mA analog quantity
PLC, then A/D conversion is carried out by PLC, the present apparatus can directly be passed the slag resistance value obtained is calculated by Industrial Ethernet or serial ports
It is sent to PLC, to avoid D/A repeatedly, A/D conversion causes transformed error；4) device full digital processing is exempted to verify.
Detailed description of the invention
Fig. 1 is the schematic device of precise measurement electroslag clinker resistance of the invention.
Fig. 2 is the control flow chart of the device measurement method of precise measurement electroslag clinker resistance of the invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that the described embodiment is only a part of the embodiment of the present invention, instead of all the embodiments.Based on this
Embodiment in invention, every other reality obtained by those of ordinary skill in the art without making creative efforts
Example is applied, shall fall within the protection scope of the present invention.
In conjunction with shown in attached drawing 1, a kind of device of precise measurement electroslag clinker resistance is disclosed in the present invention, including signal is adopted
Sample input unit 10, signal acquisition computing device 20, signal output apparatus 30；
Signal sampling input unit 10 further includes melting power supply 11, voltage transformer 12, current transformer 13；Mutual induction of voltage
One end of device 12 is connected on melting power supply 11 by the channel PSV01, the channel PSV02；The other end of voltage transformer 12 passes through
The channel AV01, the channel AV02 are connected to filter module 22；Current transformer 13 pass through mutual inductor after, by the channel AL01,
The channel AL02 is connected to filter module 22, and the voltage on melting power supply 11 is acquired using voltage transformer 12, current transformer 13
With the signal of electric current；It is filtered using signal of the filter module 22 for the voltage and current of acquisition.
Signal acquisition computing device 20 includes digital signal processor 21, filter module 22, AD conversion module 23；Number letter
Number processor 21 passes through the channel LPSDP01, the channel LPSDP02, the channel LPSDP03, the channel LPSDP04 and the company of filter module 22
It connects, is received after the filtering of filter module 22 by the channel PSDP01, the channel LPSDP02, the channel LPSDP03, the channel LPSDP04
Non-linear voltage and electric current signal, calculate voltage value and current value for digital signal processor 21, provide transmission channel；
Digital signal processor 21 passes through the channel ADSDP01, the channel ADSDP02, the channel ADSDP03, the channel ADSDP04 and AD conversion mould
Block connection；It is non-thread for being come by the channel ADSDP01, the channel ADSDP02, the channel ADSDP03, ADSDP04 channel transfer
Property voltage and current signal be converted to digital signal, digital signal processor 21 controls filter module 22 and AD conversion module
23, digital signal is converted into for the signal of non-linear voltage and electric current, digital signal processor 21 controls 22 He of filter module
AD conversion module 23 carries out, the overall process of analog- and digital- conversion, utilizes the timer timing inside digital signal processor 21
Compartment of terrain issues starting conversion and reads the control signal of data, realizes voltage and current signals and reads synchronous carry out；It is rear
The virtual value calculating of continuous voltage, electric current lays the foundation.
Signal output apparatus 30 further includes D/A conversion module 31, calibration module 32, communication module 33；Digital signal processor
21 are connected by the channel SDPDA01, the channel SDPDA02 with D/A conversion module 31, what conversion digital signal processor 21 exported
Current signal；Digital signal processor 21 is connected by the channel SDPDA03, the channel SDPDA04 with D/A conversion module 31, is converted
The voltage signal that digital signal processor 21 exports；According to the formula of Fast Fourier Transform (FFT), after carrying out voltage, electric current conversion,
It after calculating current, voltage effective value, and calculates active power: being calculated according to P=U*I*cos (φ 1- φ 2) formula, wherein U and I
It is effective to calculate voltage, electric current according to 1/1.414* voltage and current maximum value for respectively calculated voltage, current effective value
Value；φ 1 is calculated current phase, and φ 2 is calculated voltage-phase, and guarantee phase difference is positive value, is taken after calculating absolutely
Value；And the resistance value and by slag resistance value of slagging tap is calculated, digital signal is converted by D/A conversion module 31；Digital signal processor
21 are connected by the channel OAI01, the channel OAI02 with calibration module 32 by D/A conversion module 31；For calibrating digital signal
The current signal that processor 21 exports；D/A conversion module 31 is connected by the channel OVI03, the channel OVI04 with calibration module 32；
For calibrating the voltage signal of the output of digital signal processor 21；The slag of output is hindered into resistance value, is calibrated, it in this way can be accurate
The slag resistance of ground control output, the as slag of electroslag hinder resistance value, avoid D/A repeatedly, and A/D conversion is caused transformed error, reached with this
Isolate the fundametal compoment of voltage, electric current, accurate slag resistance value；Precision can reach a ten thousandth, meanwhile, evade melting power supply 11
The electromagnetic interference of generation has electromagnetism interference performance good, in forceful electric power magnet ring using above-mentioned conversion process and calibration process
Guarantee the accuracy of signal and the function of reliability in border.
Digital signal processor 21 is connected by the channel PFB01, the channel PFB02 with profibus communication module 33；
Profibus communication module 33 is connected with by profibus with VPC3 chip, and calculating data are written in digital signal processor 21
In VPC3 chip 34, calculating data mainly includes in slag resistance write-in VPC3 chip 34, for the present apparatus and PLC or industrial control equipment
It displays data, is to realize to be transmitted to slag resistance value by 4-20mA analog quantity different from conventional slag resistance transmitter in this way
PLC, then A/D conversion is carried out by PLC, the present apparatus can directly be passed the slag resistance value obtained is calculated by Industrial Ethernet or serial ports
It is sent to PLC, to avoid D/A repeatedly, A/D converts the technical issues of causing transformed error, realizes device full digital processing, exempts from school
The function of testing.
In order to realize above-mentioned function, digital signal processor 21, filter module 22, AD conversion module 23, DA modulus of conversion
Block 31, calibration module 32, communication module 33 are connect with power module 35, provide power supply.
The digital signal processor 21 used in embodiment is dsp processor.
In embodiment, the channel AV01 on filter module 22, the channel AV02 input value are exchange 0V-5V analog quantity；Filter
The channel AL01, the channel AL02 in wave module 22 are 4mA-20mA analog quantity.
In order to solve the above technical problems, a kind of device of precise measurement electroslag clinker resistance is additionally provided in the present invention
Measurement method mainly comprises the steps that
Step S10: the external equipment of initialization digital signal processor 21: the LPSDP01 of initialization filter module 22 is logical
Road, the channel LPSDP02, the channel LPSDP03, the channel LPSDP04 numerical value be set as 0000；The ADSDP01 of AD conversion module 23
Channel, the channel ADSDP02, the channel ADSDP03, the channel ADSDP04 numerical value be set as 0000, D/A conversion module 31
The channel SDPDA01, the channel SDPDA02, the channel SDPDA03, the channel SDPDA04 numerical value be set as 0000；Communication module 33
The channel PFB01, the channel PFB02 numerical value be arranged to 00；After being provided with, S20 is entered step；
Step S20: starting timer: the timer of digital signal processor 21 is opened, the timing in sampling time is carried out；
S30 is entered step after beginning；
Step S30: sampling time judgement: when the timer of digital signal processor 21 is greater than the sampling time, into step
Rapid S40；: when digital signal processor 21 timer be less than the sampling time, enter step S20；
Step S40: starting AD data conversion: digital signal processor 21 by the channel LPSDP01, the channel LPSDP02,
Data conversion trigger pulse, AD conversion is arranged according to the timer time in step S30 in the channel LPSDP03, the channel LPSDP04
Frequency of the module 23 according to trigger pulse, the voltage and current signals that voltage transformer 12, current transformer 13 are acquired are passed through
After filter module 22, carries out analog signal and be converted into digital signal；And by the channel ADSDP01, the channel ADSDP02,
The channel ADSDP03, ADSDP04 channel transfer to digital signal processor 21；After sampling time reaches, S50 is entered step；
Step S50: reading data: the digital signal in step S40 be deposited in digital signal processor 21, completes
Afterwards, S60 is entered step；
Step S60: judge data amount check: until entering step after reaching 96 data in digital signal processor 21
S70,
Step S70: voltage, electric current FFT are calculated: by the channel FFT on digital signal processor, according to fast Fourier
The formula of transformation enters step S80 after carrying out voltage, electric current conversion；
Step S80: calculating current, voltage effective value: effective by carrying out the voltage after converting in step S70, electric current
Value calculates, and after calculating electric current, voltage effective value, enters step S90；
Step S90: it calculates active power: being calculated according to P=U*I*cos (φ 1- φ 2) formula, wherein U and I is respectively to count
Voltage, the current effective value of calculating calculate voltage, current effective value according to 1/1.414* voltage and current maximum value；φ 1 is
Calculated current phase, φ 2 are calculated voltage-phase, and guarantee phase difference is positive value, are taken absolute value after calculating；Into step
Rapid S100；
Step S100: it calculates slag and hinders resistance value: passing through the arithmetic unit on digital signal processor 21, according to resistance formula R
=P/I2 calculates resistance value of slagging tap；Enter step S110；
Step S110: slag hinders resistance value transmission, by the slag resistance value in step S110, VPC3 chip is written and sends buffer area and DA
Converter, the data of write-in VPC3 chip are realized automatically by VPC3 to be communicated with main website；Enter step S120；
Step S120: resetting timer: after completing step S110, the timer on digital signal processor 21 is reset
Afterwards, step S20 is returned to.
Using the measurement method for the device that above-mentioned precise measurement electroslag clinker hinders, the accurate resistance of slag resistance can be improved
Value, solves avoid D/A repeatedly in this way, and A/D conversion causes transformed error, and the fundamental wave point for isolating voltage, electric current is reached with this
Amount, accurate slag resistance value；Precision can reach a ten thousandth, meanwhile, evade the electromagnetic interference of the generation of melting power supply 11, use is above-mentioned
Conversion process and calibration process, have electromagnetism interference performance it is good, in forceful electric power magnetic environment guarantee signal accuracy and
The function of reliability.
As the preferred embodiment of the invention, it is obvious to a person skilled in the art that showing the present invention is not limited to above-mentioned
The details of exemplary embodiment, and without departing from the spirit or essential characteristics of the present invention, it can be with other specific
Form realizes the present invention and protection scope of the present invention.Therefore, in all respects, the embodiments should be taken as
It is exemplary, and be non-limiting, the scope of the invention being indicated by the appended claims rather than by the foregoing description, therefore purport
It is including all changes that fall within the meaning and scope of the equivalent elements of the claims in the present invention.Right should not be wanted
Any appended drawing reference in asking is construed as limiting the claims involved.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiments being understood that.
Claims (5)
1. a kind of device of precise measurement electroslag clinker resistance, which is characterized in that including signal sampling input unit, signal acquisition meter
Calculate device, signal output apparatus；
The signal sampling input unit further includes melting power supply, voltage transformer, current transformer；The mutual induction of voltage
One end of device is connected on melting power supply by the channel PSV01, the channel PSV02；The other end of the voltage transformer passes through
The channel AV01, the channel AV02 are connected to the filter module；After the current transformer passes through mutual inductor, pass through AL01
Channel, the channel AL02 are connected to filter module；
The signal acquisition computing device includes digital signal processor, filter module, AD conversion module；The number letter
Number processor is connect by the channel LPSDP01, the channel LPSDP02, the channel LPSDP03, the channel LPSDP04 with filter module；Institute
The digital signal processor stated passes through the channel ADSDP01, the channel ADSDP02, the channel ADSDP03, the channel ADSDP04 and AD conversion
Module connection；Filter module described in the DSP CONTROL and the AD conversion module, are AD converted
Overall process, issue to fixed time interval starting conversion and read the control signal of data, voltage and current signals read same stepping
Row；
The signal output apparatus further includes D/A conversion module, calibration module, communication module；The digital signal processor
It is connected by the channel SDPDA01, the channel SDPDA02 with D/A conversion module, converts the digital signal processor output
Current signal；The digital signal processor is connected by the channel SDPDA03, the channel SDPDA04 with D/A conversion module, is turned
Change the voltage signal of the digital signal processor output；The D/A conversion module passes through the channel OAI01, the channel OAI02
It is connected with the calibration module；For calibrating the current signal of the digital signal processor output；The DA turns
Mold changing block is connected by the channel OVI03, the channel OVI04 with the calibration module；For calibrating at the digital signal
Manage the voltage signal of device output；
The digital signal processor is connected by the channel PFB01, the channel PFB02 with profibus communication module；It is described
Profibus communication module be connected with by profibus with VPC3 chip, digital signal processor calculating data be written
In VPC3 chip.
2. a kind of device of precise measurement electroslag clinker resistance as described in claim 1, which is characterized in that the digital signal
Processor, filter module, AD conversion module, D/A conversion module, calibration module, communication module connect with power module, provide
Power supply.
3. a kind of device of precise measurement electroslag clinker resistance as described in claim 1, which is characterized in that the digital signal
Processor is dsp processor.
4. a kind of device of precise measurement electroslag clinker resistance as described in claim 1, which is characterized in that the filter module
On the channel AV01, the channel AV02 input value be exchange 0V-5V analog quantity；The channel AL01 on the filter module, AL02
Channel is 4mA-20mA analog quantity.
5. a kind of measurement method of the device of precise measurement electroslag clinker resistance, which is characterized in that mainly comprise the steps that
Step S10: initialize the external equipment of digital signal processor: initialize filter module the channel LPSDP01,
The channel LPSDP02, the channel LPSDP03, the channel LPSDP04 numerical value be set as 0000；The channel ADSDP01 of AD conversion module,
The channel ADSDP02, the channel ADSDP03, the channel ADSDP04 numerical value be set as the channel SDPDA01 of 0000, D/A conversion module,
The channel SDPDA02, the channel SDPDA03, the channel SDPDA04 numerical value be set as 0000；The channel PFB01 of communication module, PFB02
The numerical value in channel is arranged to 00；After being provided with, S20 is entered step；
Step S20: starting timer: the timer of digital signal processor is opened, the timing in sampling time is carried out；After beginning
Enter step S30；
Step S30: sampling time judgement: when the timer of digital signal processor is greater than the sampling time, S40 is entered step；:
When digital signal processor timer be less than the sampling time, enter step S20；
Step S40: starting AD data conversion: digital signal processor passes through the channel LPSDP01, the channel LPSDP02, LPSDP03
Data conversion trigger pulse is arranged according to the timer time in step S30 in channel, the channel LPSDP04, AD conversion module according to
The frequency of trigger pulse, the voltage and current signals that voltage transformer, current transformer are acquired, after filter module,
It carries out analog signal and is converted into digital signal；And pass through the channel ADSDP01, the channel ADSDP02, the channel ADSDP03, ADSDP04
Channel transfer is to digital signal processor；After sampling time reaches, S50 is entered step；
Step S50: reading data: the digital signal in step S40 be deposited in digital signal processor, after the completion, enters
Step S60；
Step S60: judge data amount check: until S70 is entered step after reaching 96 data in digital signal processor,
Step S70: voltage, electric current FFT are calculated: by the channel FFT on digital signal processor, according to Fast Fourier Transform (FFT)
Formula, carry out voltage, electric current conversion after, enter step S80；
Step S80: calculating current, voltage effective value: by the way that the voltage after converting in step S70, electric current are carried out virtual value meter
It calculates, after calculating electric current, voltage effective value, enters step S90；
Step S90: it calculates active power: being calculated according to P=U*I*cos (φ 1- φ 2) formula, wherein U and I is respectively and calculates
Voltage, current effective value voltage, current effective value calculated according to 1/1.414* voltage and current maximum value；φ 1 is to calculate
Current phase out, φ 2 are calculated voltage-phase, and guarantee phase difference is positive value, are taken absolute value after calculating；It enters step
S100；
Step S100: it calculates slag and hinders resistance value: by the arithmetic unit on digital signal processor, according to formula R=P/I2It calculates
Slag resistance value；Enter step S110；
Step S110: slag hinders resistance value transmission, by the slag resistance value in step S110, VPC3 chip is written and sends buffer area and DA conversion
Device, the data of write-in VPC3 chip are realized automatically by VPC3 chip to be communicated with main website；Enter step S120；
Step S120: it resetting timer: after completing step S110, after the timer resetting on digital signal processor, returns to
Step S20.
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