CN103728366B - A kind of signal analysis device for the continuous iron loss measurement of electrical sheet and method - Google Patents
A kind of signal analysis device for the continuous iron loss measurement of electrical sheet and method Download PDFInfo
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Abstract
The present invention relates to a kind of signal analysis device for the continuous iron loss measurement of electrical sheet and method, comprising: multichannel analog to digital converter, for converting secondary voltage signals and primary current signal to digital quantity; FPGA, for calculating in real time the digital quantity of secondary voltage signals and primary current signal; Microcontroller, calculates the electrical sheet signal of acquisition in real time for reading and process secondary voltage signals, primary current signal and FPGA in real time; Multi-channel digital and analogue converter, the signal for being transmitted by described microcontroller converts analog quantity to and exports; The sinusoidal feedback circuit of secondary voltage, for measuring the phase place of secondary voltage signals and power frequency sinusoidal signal, phase shift process is carried out to secondary voltage signals, obtain the signal identical with power frequency sinusoidal signal phase place, after again the waveform difference between the secondary voltage signals after power frequency sinusoidal signal and phase shift being amplified, be superimposed upon in power frequency sinusoidal signal and export.The present invention reflects electrical sheet performance in real time, ensure that secondary voltage waveform is sinusoidal simultaneously.
Description
Technical field
The present invention relates to electrical sheet technical field, particularly relate to a kind of signal analysis device for the continuous iron loss measurement of electrical sheet (siliconized plate) and method.
Background technology
At present, two kinds of methods are adopted to carry out the measurement of electrical sheet iron loss in the world---Epstein side's circle method and SST single sheet measurement method, these two kinds of methods have done detailed regulation respectively in IEC60404-2, IEC60404-3 standard, its measuring unit is made up of voltage table, reometer and power meter, signal source is sine-wave generator, utilizes secondary voltage waveform modelling to feed back and keeps secondary voltage waveform sinusoidal.
Because said method is static measurement, not high to the requirement of real-time of voltage table, reometer and power meter, in measuring process, material immobilizes, and measurement result can be the response of hundreds of millisecond, when it is applied to the measurement of continuous iron loss, material moves in measurement wire frame, require measurement result real-time response, because each cycle must continuously provide the calculated value of voltage, electric current and power, the performance of electrical sheet could be reflected in real time.Simultaneously, waveform feedback under static is difficult to stable in continuous iron loss is measured, one is that the measurement wire frame field coil air core inductor measured of continuous iron loss and direct current resistance are far longer than epstein side's circle method and the corresponding coil of SST single sheet measurement method, two is that electrical sheet moves continuously, material property changes thereupon, cause original waveform feedback under these two kinds of methods no longer applicable, secondary voltage waveform sine (sinusoidal waveform of magnetic flux) cannot be ensured.
In addition, patent CN1928581A proposes a kind of electrical sheet magnetic property on-line detecting system, and the signal of measuring coil is converted to digital signal input computing machine by data collecting card by it, is analyzed, and send control signal by computing machine to the signal gathered.In the program, after data collecting card stores a given data, computing machine calculates and Output rusults again, is difficult to accomplish that each cycle continuously provides the calculated value of voltage, electric current and power, and does not also propose how to ensure that secondary voltage waveform is sinusoidal.
Therefore, for the problems referred to above, the present invention proposes a kind of signal analysis device for the continuous iron loss measurement of electrical sheet and method.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of signal analysis device of measuring for the continuous iron loss of electrical sheet and method, for solve during existing electrical sheet iron loss is measured exist cannot real-time response and ensure the problems such as secondary voltage waveform is sinusoidal.
The technical scheme that the present invention solves the problems of the technologies described above is as follows: a kind of signal analysis device measured for the continuous iron loss of electrical sheet, secondary voltage signals in measuring for the treatment of the continuous iron loss of electrical sheet and primary current signal, comprise the sinusoidal feedback circuit of multichannel analog to digital converter, field programmable gate array (Field-ProgrammableGateArray, FPGA), microcontroller, multi-channel digital and analogue converter and secondary voltage;
Described multichannel analog to digital converter, for converting secondary voltage signals and primary current signal to digital quantity, and is transferred to FPGA by the secondary voltage signals after conversion and primary current signal;
Described FPGA, for calculating in real time the digital quantity of secondary voltage signals and primary current signal, and electrical sheet Signal transmissions secondary voltage signals, primary current signal and calculating in real time obtained is to described microcontroller;
Described microcontroller, for reading and process the signal that described FPGA transmits in real time, and gives described multi-channel digital and analogue converter by the Signal transmissions of reading and process;
Described multi-channel digital and analogue converter, the signal for being transmitted by described microcontroller converts analog quantity to and exports;
The sinusoidal feedback circuit of described secondary voltage, it is for generation of power frequency sinusoidal signal and receive secondary voltage signals, and measure the phase place of secondary voltage signals and power frequency sinusoidal signal respectively, again phase shift process is carried out to secondary voltage signals, obtain the signal identical with power frequency sinusoidal signal phase place, after again the waveform difference between the secondary voltage signals after power frequency sinusoidal signal and phase shift being amplified, be superimposed upon in power frequency sinusoidal signal and export.
On the basis of technique scheme, the present invention can also do following improvement.
Further, the electrical sheet signal that described FPGA calculates acquisition in real time comprises: voltage effective value, average voltage, current effective value, current peak, H signal and power.
Further, described microcontroller also for: calculate magnetic induction density sequence according to secondary voltage signals sequence, field pulses is calculated according to primary current signal, depict magnetic hysteresis loop by magnetic induction density sequence and field pulses again, and the display screen signal read and process and magnetic hysteresis loop being transferred to connection shows.
Further, the sinusoidal feedback circuit of described secondary voltage comprises sinusoidal signal generator, phase measurement module, analog to digital converter, digital phase shifter, digital to analog converter, waveform difference amplifier and totalizer;
Described sinusoidal signal generator, for generation of power frequency sinusoidal signal, and is transferred to phase measurement module, waveform difference amplifier and totalizer by the power frequency sinusoidal signal of generation;
Described phase measurement module, the phase value of measurement for measuring the phase place of secondary voltage signals and power frequency sinusoidal signal, and is transferred to described digital phase shifter by it;
Described analog to digital converter, it is for being converted to digital quantity by secondary voltage signals and being transferred to digital phase shifter;
Described digital phase shifter, it connects described analog to digital converter and described phase measurement module, for the digital quantity of secondary voltage signals is converted to the signal identical with power frequency sinusoidal signal phase place in real time, and exports to described digital to analog converter;
Described digital to analog converter, it connects described digital phase shifter and waveform difference amplifier, for carrying out digital-to-analog conversion to the secondary voltage signals after phase shift;
Described waveform difference amplifier, it connects described sinusoidal signal generator and described totalizer, for the waveform difference between the secondary voltage signals after power frequency sinusoidal signal and phase shift being amplified, obtain waveform difference value signal, and export waveform difference value signal to totalizer;
Described totalizer, it connects described sinusoidal signal generator and described waveform difference amplifier, for superposing power frequency sinusoidal signal and waveform difference value signal.
Corresponding above-mentioned a kind of signal analysis device, technical scheme of the present invention also comprises a kind of signal analysis method measured for the continuous iron loss of electrical sheet, secondary voltage signals in measuring for the treatment of the continuous iron loss of electrical sheet and primary current signal, is characterized in that, comprise the following steps:
Analog to digital conversion step: convert secondary voltage signals and primary current signal to digital quantity;
Real-time calculation procedure: adopt the digital quantity of FPGA to secondary voltage signals and primary current signal to calculate in real time, and electrical sheet Signal transmissions secondary voltage signals, primary current signal and calculating in real time obtained is to microcontroller process;
Signal transacting step: microcontroller reads in real time and processes and processes the signal of FPGA transmission;
Digital-to-analog conversion step: the signal being read in real time by microcontroller and process converts analog quantity to and exports;
The sinusoidal feedback step of secondary voltage: produce power frequency sinusoidal signal, and receive secondary voltage signals, measure the phase place of secondary voltage signals and power frequency sinusoidal signal respectively, again phase shift process is carried out to secondary voltage signals, obtain the signal identical with power frequency sinusoidal signal phase place, after again the waveform difference between the secondary voltage signals after power frequency sinusoidal signal and phase shift being amplified, be superimposed upon in power frequency sinusoidal signal and export.
Further, the described real-time electrical sheet signal obtained that calculates comprises: voltage effective value, average voltage, current effective value, current peak, H signal and power.
Further, described signal measurement step also comprises: calculate magnetic induction density sequence according to secondary voltage signals sequence, field pulses is calculated according to primary current signal, magnetic hysteresis loop is depicted again by magnetic induction density sequence and field pulses, and the signal of display reading and process and magnetic hysteresis loop.
Further, described waveform difference feedback step specifically comprises:
Step 1, produces power frequency sinusoidal signal, and receives secondary voltage signals;
Step 2, measures the phase place of secondary voltage signals and power frequency sinusoidal signal;
Step 3, is converted to digital quantity by secondary voltage signals, and based on the phase value that step 2 is measured, the digital quantity of secondary voltage signals is converted to the signal identical with power frequency sinusoidal signal phase place in real time;
Step 4, carries out digital-to-analog conversion to the secondary voltage signals after the phase shift process of step 3;
Step 5, amplifies the waveform difference between the secondary voltage signals analog quantity after power frequency sinusoidal signal and phase shift, obtains waveform difference value signal;
Step 6, superposition power frequency sinusoidal signal and waveform difference value signal, and export the signal after superposition.
The invention has the beneficial effects as follows: the present invention mainly completes the functions such as waveform signal generation, electric current and voltage power measurement, it converts primary current and secondary voltage analog quantity real-time synchronization to digital quantity, the parameter such as calculating voltage effective value, average voltage, current effective value, current peak, H signal and power again, and each cycle continuously can calculate above-mentioned parameter, to ensure measurement result real-time response, realize reflection electrical sheet performance in real time.On the other hand, present invention employs the sinusoidal feedback circuit of secondary voltage, ensure that secondary voltage waveform is sinusoidal.
Accompanying drawing explanation
Fig. 1 is the structural representation of signal analysis device of the present invention;
Fig. 2 is the schematic flow sheet of signal analysis method of the present invention;
Fig. 3 is the schematic flow sheet of the sinusoidal feedback step of secondary voltage of the present invention;
In accompanying drawing, the list of parts representated by each label is as follows:
1, signal analysis device, 2, signal synchronous control unit, 3, wire frame is measured, 4, power amplifier unit, 5, secondary voltage amplifier, 6, primary current amplifier, 7, multichannel analog to digital converter, 8, FPGA, 9, microcontroller, 10, multi-channel digital and analogue converter, 11, the sinusoidal feedback circuit of secondary voltage, 12, display screen, 111, sinusoidal signal generator, 112, phase measurement module, 113, analog to digital converter, 114, digital phase shifter, 115, digital to analog converter, 116, waveform difference amplifier, 117, totalizer.
Embodiment
Be described principle of the present invention and feature below in conjunction with accompanying drawing, example, only for explaining the present invention, is not intended to limit scope of the present invention.
This gives a kind of signal analysis device 1 measured for the continuous iron loss of electrical sheet, it is connected signal synchronous control unit 2 conventional in iron loss measurement mechanism with electrical sheet, measure wire frame 3 and power amplifier unit 4 with the use of, it is the vitals that electrical sheet connects iron loss measurement mechanism, be mainly used in analyzing the secondary voltage signals in the continuous iron loss measurement of electrical sheet and primary current signal, and the voltage effective value will produced in process by analysis, average voltage, current effective value, current peak, the parameter transmission such as H signal and power processes to signal synchronous control unit, simultaneously also for ensureing that secondary voltage waveform is sinusoidal.The secondary voltage signals of measurement wire frame 3 and primary current signal transfer in described signal analysis device 1 respectively and process after secondary voltage amplifier 5 and primary current amplifier 6 amplify, also can direct integrated secondary voltage amplifier 5 and primary current amplifier 6 in signal analysis device.
As shown in Figure 1, this signal analysis device comprises the sinusoidal feedback circuit 11 of multichannel analog to digital converter 7, FPGA8, microcontroller 9, multi-channel digital and analogue converter 10 and secondary voltage, and each functions of modules is specific as follows.
Described multichannel analog to digital converter 7, for converting secondary voltage signals and primary current signal to digital quantity, and is transferred to FPGA by the secondary voltage signals after conversion and primary current signal.
Described FPGA8, for calculating in real time the digital quantity of secondary voltage signals and primary current signal, and electrical sheet Signal transmissions secondary voltage signals, primary current signal and calculating in real time obtained is to described microcontroller.The electrical sheet signal that described FPGA calculates acquisition in real time comprises: voltage effective value, average voltage, current effective value, current peak, H signal and power.
Described microcontroller 9, for reading and process the signal that described FPGA transmits in real time, and gives described multi-channel digital and analogue converter 10 by the Signal transmissions of reading and process.Described microcontroller also for: calculate magnetic induction density sequence according to secondary voltage signals sequence, field pulses is calculated according to primary current signal, depict magnetic hysteresis loop by magnetic induction density sequence and field pulses again, and the display screen 12 signal read and process and magnetic hysteresis loop being transferred to connection shows.
Described multi-channel digital and analogue converter 10, converts analog quantity to for the signal transmitted by described microcontroller 9 and exports.
The sinusoidal feedback circuit 11 of described secondary voltage, it is for generation of power frequency sinusoidal signal and receive secondary voltage signals, and measure the phase place of secondary voltage signals and power frequency sinusoidal signal respectively, again phase shift process is carried out to secondary voltage signals, obtain the signal identical with power frequency sinusoidal signal phase place, after again the waveform difference between the secondary voltage signals after power frequency sinusoidal signal and phase shift being amplified, be superimposed upon in power frequency sinusoidal signal and export.
In conjunction with above-mentioned analysis, the signal of known output comprises secondary voltage signals, primary current signal and calculates the electrical sheet signal obtained in real time, these signals enter the signal synchronous control unit of the continuous iron loss measurement mechanism of electrical sheet, carry out signal synchronously to process, to guarantee to reflect electrical sheet performance in real time.
Similarly, as shown in Figure 1, the sinusoidal feedback circuit 11 of described secondary voltage comprises sinusoidal signal generator 111, phase measurement module 112, analog to digital converter 113, digital phase shifter 114, digital to analog converter 115, waveform difference amplifier 116 and totalizer 117, and the concrete function of each module is as described below.
Described sinusoidal signal generator 111, for generation of power frequency sinusoidal signal, and is transferred to phase measurement module, waveform difference amplifier and totalizer by the power frequency sinusoidal signal of generation.
Described phase measurement module 112, the phase value of measurement for measuring the phase place of secondary voltage signals and power frequency sinusoidal signal, and is transferred to described digital phase shifter by it.
Described analog to digital converter 113, it is for being converted to digital quantity by secondary voltage signals and being transferred to digital phase shifter.
Described digital phase shifter 114, it connects described analog to digital converter and described phase measurement module, for the digital quantity of secondary voltage signals is converted to the signal identical with power frequency sinusoidal signal phase place in real time, and exports to described digital to analog converter.
Described digital to analog converter 115, it connects described digital phase shifter and waveform difference amplifier, for carrying out digital-to-analog conversion to the secondary voltage signals after phase shift.
Described waveform difference amplifier 116, it connects described sinusoidal signal generator and described totalizer, for the waveform difference between the secondary voltage signals after power frequency sinusoidal signal and phase shift being amplified, obtain waveform difference value signal, and export waveform difference value signal to totalizer.
Described totalizer 117, it connects described sinusoidal signal generator and described waveform difference amplifier, and for superposing power frequency sinusoidal signal and waveform difference value signal, the signal after superposition is sent in power amplifier unit and processed.
In the present embodiment, described microcontroller can adopt 32 ARM chips.
Corresponding above-mentioned signal analysis device, the present embodiment gives a kind of signal analysis method measured for the continuous iron loss of electrical sheet, secondary voltage signals in measuring for the treatment of the continuous iron loss of electrical sheet and primary current signal, principle of work is consistent with above-mentioned signal analysis device with specific implementation, as shown in Figure 2, comprise the following steps:
1) analog to digital conversion step: convert secondary voltage signals and primary current signal to digital quantity.
2) real-time calculation procedure: adopt the digital quantity of FPGA to secondary voltage signals and primary current signal to calculate in real time, and electrical sheet Signal transmissions secondary voltage signals, primary current signal and calculating in real time obtained is to microcontroller process, and the electrical sheet signal that calculating obtains in real time comprises: voltage effective value, average voltage, current effective value, current peak, H signal and power.
3) signal transacting step: microcontroller reads in real time and processes the signal of FPGA transmission; Microcontroller calculates magnetic induction density sequence according to secondary voltage signals sequence, calculates field pulses according to primary current signal, then depicts magnetic hysteresis loop by magnetic induction density sequence and field pulses, and the signal of display reading and process and magnetic hysteresis loop.
4) digital-to-analog conversion step: the signal being read in real time by microcontroller and process converts analog quantity to and exports;
5) the sinusoidal feedback step of secondary voltage: produce power frequency sinusoidal signal, and receive secondary voltage signals, measure the phase place of secondary voltage signals and power frequency sinusoidal signal respectively, again phase shift process is carried out to secondary voltage signals, obtain the signal identical with power frequency sinusoidal signal phase place, after again the waveform difference between the secondary voltage signals after power frequency sinusoidal signal and phase shift being amplified, be superimposed upon in power frequency sinusoidal signal and export.
Wherein, as shown in Figure 3, the sinusoidal feedback step of secondary voltage specifically comprises:
Step 1, produces power frequency sinusoidal signal, and receives secondary voltage signals;
Step 2, measures the phase place of secondary voltage signals and power frequency sinusoidal signal;
Step 3, is converted to digital quantity by secondary voltage signals, and based on the phase value that step 2 is measured, the digital quantity of secondary voltage signals is converted to the signal identical with power frequency sinusoidal signal phase place in real time;
Step 4, carries out digital-to-analog conversion to the secondary voltage signals after the phase shift process of step 3;
Step 5, amplifies the waveform difference between the secondary voltage signals analog quantity after power frequency sinusoidal signal and phase shift, obtains waveform difference value signal;
Step 6, superposition power frequency sinusoidal signal and waveform difference value signal, and export the signal after superposition.
In the present embodiment, if voltage sample point is [V1 in one-period ... Vi ... Vn], current sample point [I1 ... Ii ... In], then voltage effective value, mean value, current effective value, peak value and active power have following formula:
According to above-mentioned formula, the hardware circuits such as multiplier, totalizer, absolute value device, extraction of square root device are combined in FPGA, measure incessantly in real time and calculating voltage effective value, average voltage, current effective value, current peak, H signal and power, each cycle upgrades an above-mentioned parameter, realizes the electrical sheet performance measuring motion continuously truly.
Microcontroller have read the electric current and voltage sampled point of each cycle, every 0.5 second display voltage current waveform, and carries out trapezoid numerical integration to contact potential series and can obtain magnetic induction density sequence [B1 ... Bi ... Bn], wherein:
B1＝k*V1,B2＝B1+k*V2,Bi＝Bi-1+k*Vi，……
After above-mentioned adding up, according to positive peak and negative peak, sequence is adjusted, make sequence Symmetrical can obtain magnetic induction density sequence thus, to [I1 ... Ii ... In] can be calculated field pulses [H1 ... Hi ... Hn], can magnetic hysteresis loop be described thus.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. the signal analysis device measured for the continuous iron loss of electrical sheet, secondary voltage signals in measuring for the treatment of the continuous iron loss of electrical sheet and primary current signal, it is characterized in that, comprise the sinusoidal feedback circuit of multichannel analog to digital converter, on-site programmable gate array FPGA, microcontroller, multi-channel digital and analogue converter and secondary voltage;
Described multichannel analog to digital converter, for converting secondary voltage signals and primary current signal to digital quantity, and is transferred to FPGA by the secondary voltage signals after conversion and primary current signal;
Described FPGA, for calculating in real time the digital quantity of secondary voltage signals and primary current signal, and electrical sheet Signal transmissions secondary voltage signals, primary current signal and calculating in real time obtained is to described microcontroller;
Described microcontroller, for reading and process the signal that described FPGA transmits in real time, and gives described multi-channel digital and analogue converter by the Signal transmissions of reading and process;
Described multi-channel digital and analogue converter, the signal for being transmitted by described microcontroller converts analog quantity to and exports;
The sinusoidal feedback circuit of described secondary voltage, it is for generation of power frequency sinusoidal signal and receive secondary voltage signals, and measure the phase place of secondary voltage signals and power frequency sinusoidal signal respectively, again phase shift process is carried out to secondary voltage signals, obtain the signal identical with power frequency sinusoidal signal phase place, after again the waveform difference between the secondary voltage signals after power frequency sinusoidal signal and phase shift being amplified, be superimposed upon in power frequency sinusoidal signal and export.
2. signal analysis device according to claim 1, is characterized in that, the electrical sheet signal that described FPGA calculates acquisition in real time comprises: voltage effective value, average voltage, current effective value, current peak and power.
3. signal analysis device according to claim 1, it is characterized in that, described microcontroller also for: calculate magnetic induction density sequence according to secondary voltage signals sequence, field pulses is calculated according to primary current signal, depict magnetic hysteresis loop by magnetic induction density sequence and field pulses again, and the display screen signal read and process and magnetic hysteresis loop being transferred to connection shows.
4. signal analysis device according to claim 1, it is characterized in that, the sinusoidal feedback circuit of described secondary voltage comprises sinusoidal signal generator, phase measurement module, analog to digital converter, digital phase shifter, digital to analog converter, waveform difference amplifier and totalizer;
Described sinusoidal signal generator, for generation of power frequency sinusoidal signal, and is transferred to phase measurement module, waveform difference amplifier and totalizer by the power frequency sinusoidal signal of generation;
Described phase measurement module, the phase value of measurement for measuring the phase place of secondary voltage signals and power frequency sinusoidal signal, and is transferred to described digital phase shifter by it;
Described analog to digital converter, it is for being converted to digital quantity by secondary voltage signals and being transferred to digital phase shifter;
Described digital phase shifter, it connects described analog to digital converter and described phase measurement module, for the digital quantity of secondary voltage signals is converted to the signal identical with power frequency sinusoidal signal phase place in real time, and exports to described digital to analog converter;
Described digital to analog converter, it connects described digital phase shifter and waveform difference amplifier, for carrying out digital-to-analog conversion to the secondary voltage signals after phase shift;
Described waveform difference amplifier, it connects described sinusoidal signal generator and described totalizer, for the waveform difference between the secondary voltage signals after power frequency sinusoidal signal and phase shift being amplified, obtain waveform difference value signal, and export waveform difference value signal to totalizer;
Described totalizer, it connects described sinusoidal signal generator and described waveform difference amplifier, for superposing power frequency sinusoidal signal and waveform difference value signal.
5., for the signal analysis method that the continuous iron loss of electrical sheet is measured, the secondary voltage signals in measuring for the treatment of the continuous iron loss of electrical sheet and primary current signal, is characterized in that, comprise the following steps:
Analog to digital conversion step: convert secondary voltage signals and primary current signal to digital quantity;
Real-time calculation procedure: adopt the digital quantity of FPGA to secondary voltage signals and primary current signal to calculate in real time, and electrical sheet Signal transmissions secondary voltage signals, primary current signal and calculating in real time obtained is to microcontroller process;
Signal transacting step: microcontroller reads in real time and processes and processes the signal of FPGA transmission;
Digital-to-analog conversion step: the signal being read in real time by microcontroller and process converts analog quantity to and exports;
The sinusoidal feedback step of secondary voltage: produce power frequency sinusoidal signal, and receive secondary voltage signals, measure the phase place of secondary voltage signals and power frequency sinusoidal signal respectively, again phase shift process is carried out to secondary voltage signals, obtain the signal identical with power frequency sinusoidal signal phase place, after again the waveform difference between the secondary voltage signals after power frequency sinusoidal signal and phase shift being amplified, be superimposed upon in power frequency sinusoidal signal and export.
6. signal analysis method according to claim 5, is characterized in that, the described real-time electrical sheet signal obtained that calculates comprises: voltage effective value, average voltage, current effective value, current peak and power.
7. signal analysis method according to claim 5, it is characterized in that, described signal transacting step also comprises: calculate magnetic induction density sequence according to secondary voltage signals sequence, field pulses is calculated according to primary current signal, magnetic hysteresis loop is depicted again by magnetic induction density sequence and field pulses, and the signal of display reading and process and magnetic hysteresis loop.
8. signal analysis method according to claim 5, is characterized in that, the sinusoidal feedback step of secondary voltage specifically comprises:
Step 1, produces power frequency sinusoidal signal, and receives secondary voltage signals;
Step 2, measures the phase place of secondary voltage signals and power frequency sinusoidal signal;
Step 3, is converted to digital quantity by secondary voltage signals, and based on the phase value that step 2 is measured, the digital quantity of secondary voltage signals is converted to the signal identical with power frequency sinusoidal signal phase place in real time;
Step 4, carries out digital-to-analog conversion to the secondary voltage signals after the phase shift process of step 3;
Step 5, amplifies the waveform difference between the secondary voltage signals analog quantity after power frequency sinusoidal signal and phase shift, obtains waveform difference value signal;
Step 6, superposition power frequency sinusoidal signal and waveform difference value signal, and export the signal after superposition.
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