CN2098689U - Six-channel real-time harmonic analyzer - Google Patents

Abstract

The utility model relates to a six-channel real-time harmonic analyzer capable of measuring single-phase voltage and current or three-phase voltage and current in a three-phase circuit at real time. The utility model comprises an input link (1), a signal selecting link (2), a span controlling link (3), a frequency selection processing link (4), a sampling holding link (5), an A/D commutation converting link (6), a synchronous source selecting link (7), a preshaping synchronous sampling pulse generator (8), a single chip computer (9), a printer (10), a display (11), a panel controller (12), etc. The utility model has the advantages of convenient and safe operation, high measuring precision, etc., and provides an ideal measuring means for the real-time analysis of the harmonic state of three-phase voltage and current in an electric power system, and for guaranteeing the safety of electric equipment.

Description

Six-channel real-time harmonic analyzer

The utility model belongs to fields of measurement, relates to a kind of real-time six passage harmonic analysis instruments.

The harmonic pollution of electrical network directly influences the safety of electrical network and consumer, the at present used NOWA-1 type analysis instrument of producing with the harmonic analysis instrument equal degree of accuracy of the utility model such as West Germany, can only measure one road voltage and one road electric current simultaneously, its import price costliness, this kind harmonic analysis instrument can not satisfy the requirement of three phase harmonic real-time analysis owing to can not measure three-phase voltage in the three-phase circuit simultaneously and the harmonic wave situation of change of three-phase current.Other various harmonic analysis instruments not only can not measure in real time by three-phase, and measured deviation are big.

Task of the present utility model provides a kind of six independent measurement channels that have, and can realize the harmonic wave of three-phase voltage in the three-phase circuit and three-phase current is carried out the instrument of real-time Measurement and analysis, and this kind analyser cost is low, and is reasonable in design, and error is little.

This instruments design six measurement passages of gathering measured signal simultaneously, there are three passages to measure three-phase voltage signal in the three-phase circuit in real time, have three passages measure in real time in the three-phase circuit three-phase current signal, each passage is by having the input element that can gather measured signal, have the self-tuning signal that to drift about and to lack of proper care and select link, has the measurement range selection link that can make the range overload alarm, have and to carry out the frequency-selecting processing links that frequency is selected, has the voltage that to gather through frequency-selecting, electric current also keeps the sampling of certain hour to keep link and carry out analog-to-digital A/D conversion links front and back connecting successively, synchronisation source with available synchronisation source selects link to connect with the pre-shaping Synchronous Sampling Pulses Gremerator that can make waveform carry out pre-shaping and to produce synchronizing pulse, the two-way of pre-shaping Synchronous Sampling Pulses Gremerator is exported one the tunnel and is gone to keep link to connect with the sampling of each passage, one the tunnel goes to connect with the A/D conversion links of each passage, and the two-way that the A/D transfer process is finished signal is exported one the tunnel and gone to connect with the reset gate of pre-shaping Synchronous Sampling Pulses Gremerator, one the tunnel connects with single-chip microcomputer; Signal selects link, range controlling unit, synchronisation source to select link, printer, display, panel control all to connect with single-chip microcomputer.

Because this instrument in signal input link, has used the micro mutual inductor of the charged sub-compensator of design voluntarily, the ratio of adjustment input circuit and angular difference have guaranteed the accuracy that instrument is required easily.Amplifier in this link adopts differential input mode, has not only improved the common-mode rejection ratio of instrument, has strengthened the antijamming capability of instrument, and can use under any junction style of electric system easily and safely.

Synchronized sampling link of the present utility model has been used pre-shaping technique, the amplitude noise in the synchronizing signal and the influence of phase noise have been eliminated, reduced the inspection error mutually of phase detectors in the phase-locked loop, realized the synchronized sampling of non-sinusoidal wave exactly, suppressed the leakage effect in the sampled digital measurement, the accuracy when having improved the apparatus measures higher hamonic wave.

This instrument adopts fast basic 2 Fourier transformations analytical voltage and electric current simultaneously with single-chip microcomputer as the core of frequency analysis, and utilizes floating-point operation, has improved the efficient of frequency analysis, and the additive error that makes in the data operation to be produced can be ignored.

Fig. 1 is a theory diagram of the present utility model.

Fig. 2 is input element circuit theory diagrams of the present utility model.

Fig. 3 a, b, c are that synchronisation source of the present utility model is selected and pre-shaping Synchronous Sampling Pulses Gremerator circuit theory diagrams.

Fig. 4 is the front panel synoptic diagram of the utility model shell.

Fig. 5 is the utility model shell rear panel synoptic diagram.

Following adjoint is described further embodiment of the present utility model.

The said real-time six passage harmonic analysis instruments of present embodiment, I is arranged, II, III, IV, V, VI is totally six signal measurement passages independently, wherein, there are three passages to measure three-phase voltage and three-phase current in the three-phase circuit in real time respectively, I-1, II-1, III-1, IV-1, V-1, VI-1 is the differential input element of floating (1), I-2, II-2, III-2, IV-2, V-2, VI-2 is signal and selects link (2), I-3, II-3, III-3, IV-3, V-3, VI-3 is range controlling unit (3), I-4, II-4, III-4, IV-4, V-4, VI-4 is frequency-selecting processing links (4), I-5, II-5, III-5, IV-5, V-5, VI-5 is sampling and keeps link (5), I-6, II-6, III-6, IV-6, V-6, VI-6 is A/D conversion links (6), (7) select link for synchronisation source, (8) be pre-shaping Synchronous Sampling Pulses Gremerator, (9) be single-chip microcomputer, (10) be printer, (11) be display, (12) be panel control, (13) are the instrument rectifier power source.Each passage is by the input element that can gather measured signal (1), can select link (2) to zero point drift and because the required correction signal of self-correcting is carried out in the imbalance that temperature effect produces, has the measurement range selection link (3) that can make the range overload alarm, has the frequency processing link (4) that frequency can be selected within the required range, has the voltage that to gather through frequency-selecting, electric current also keeps the sampling of certain hour to keep link (5), can carry out connecting successively before and after the analog-to-digital A/D conversion links (6), synchronisation source with available 4 kinds of synchronisation sources selects link (7) to carry out pre-shaping with the output waveform that can make synchronisation source and the pre-shaping Synchronous Sampling Pulses Gremerator (8) that produces synchronizing pulse connects, the two-way of Synchronous Sampling Pulses Gremerator (8) is exported the sampling maintenance link (5) that one road signal Ps removes to control each passage, one road signal Pa goes to control the A/D conversion links (6) of each passage, the two-way of A/D conversion links (6) is exported the reset gate that one road signal Pe goes to control pre-shaping Synchronous Sampling Pulses Gremerator, one the tunnel connects with single-chip microcomputer (9), signal is selected link (2), range controlling unit (3), synchronisation source is selected link (7), printer (10), display (11), panel control (12) all connects with single-chip microcomputer (9), can export direct current+5V for one, the rectifier power source of ± 15V (13) provides working power for each loop.Input element (1) is made up of ratio circuit (1-1), micro mutual inductor (1-2), prime amplifier (1-3), and here, ratio circuit is by resistance R ₁～R ₃Be composed in series two termination measured signals of resistance in series, micro mutual inductor B ₁Input end be connected across resistance R ₂Two ends, micro mutual inductor B ₁Two output terminals connect with prime amplifier.During measuring voltage, ratio circuit is the input end that is added to micro mutual inductor by high-impedance voltage divider by a certain percentage; When measuring electric current, add to the input end of micro mutual inductor by means of a contactless measurement resistance.Prime amplifier (1-3) is by proportion resistor R ₄～R ₇, limiter diode D ₁, D ₂, phase angle difference is regulated resistance R ₈, capacitor C ₁, potentiometer RW ₁, proportional amplifier IC ₁, output resistance R ₉Form, wherein, micro mutual inductor B ₁Two output terminals respectively through resistance R ₄, R ₅Meet amplifier IC ₁Negative, positive input end, amplifier IC ₁Negative, positive input end between two opposite polarity diode D of cross-over connection ₁, D ₂, amplifier IC ₁Positive input terminal through resistance R ₇Connecting to neutral, resistance R ₆Be connected across amplifier IC ₁Negative input end and output terminal between, amplifier IC ₁Output through resistance R ₈, potentiometer RW ₁, resistance R ₉Be connected to signal and select link (2), potentiometer RW ₁Movable end be connected on resistance R ₈Output terminal on, potentiometer RW ₁, resistance R ₉Between through capacitor C ₁Connecting to neutral.

It is by synchronisation source code lock storage IC that synchronisation source is selected link (7) ₂With multi-way switch IC ₃Connect and form, wherein, multi-way switch IC ₃Be associated with alternative 4 road synchronisation source e, f, g, h, latch IC ₂Connect with single-chip microcomputer, manually button is selected synchronisation source, instrument carries out the generation of pre-shaping synchronized sampling starting impulse, its course of work is by system controlled by computer, synchronisation source can be measured signal, can be the crystal oscillator that equipment itself is provided with, can be the used power supply of instrument, can be outside optional input sync signal.Instrument can carry out self check, and whether each part of inspection apparatus is in normal condition, if when being in normal condition, the pilot lamp of each several part is glittering in succession, and instrument connects measured signal and promptly enters duty.

With pre-shaping Synchronous Sampling Pulses Gremerator (8) that synchronisation source selects link (7) to connect is to be made into shaping first time link (8-1) for waveform necessarily, the waveform after the shaping is carried out the shaping second time link (8-3) that the first-harmonic that first-harmonic selects is selected link (8-2), first-harmonic after will selecting carries out shaping again by the voltage that will have harmonic wave, connect composition successively with the synchronized sampling starting impulse generation link (8-4) that produces synchronizing pulse, shaping link (8-1) is by resistance R for the first time ₁₀, capacitor C ₂, C ₃The high-frequency filter circuit of forming, amplitude limit voltage stabilizing diode D ₃, D ₄, proportion resistor R ₁₁, R ₁₂, proportional amplifier IC ₄, output resistance R ₁₄, resistance R ₁₃Form, wherein, select (7) next signal successively through high-frequency filter circuit, resistance R by synchronisation source ₁₁With amplifier IC ₄Negative input end connect resistance R ₁₂Be connected across amplifier IC ₄Negative input end and output terminal between, amplifier IC ₄The positive input terminal connecting to neutral, amplifier IC ₄Output terminal successively through resistance R ₁₃, R ₁₄Connect the input end D ' that first-harmonic is selected link (8-2), resistance R through output terminal D ₁₃, R ₁₄Between through the positive and negative amplitude limit voltage stabilizing diode D that connects ₃, D ₄Connecting to neutral.First-harmonic is selected link (8-2) and is made up of two-stage bandpass filter, and its two-stage bandpass filter is by resistance R ₁₅～R ₂₁, capacitor C ₄～C ₇, potentiometer RW ₂, RW ₃, amplifier IC ₅, IC ₆Form, wherein, the output of shaping link (8-1) is through capacitor C for the first time ₅Meet amplifier IC ₅Negative input end, resistance R ₁₅With potentiometer RW ₂Be connected on amplifier IC after the series connection ₅Negative input end and output terminal between, potentiometer RW ₂Activity termination amplifier IC ₅Output terminal, capacitor C ₄Be connected across capacitor C ₅Input end and amplifier IC ₅Output terminal between, capacitor C ₅Input end through resistance R ₁₆Connecting to neutral, IC ₅Output through resistance R ₁₇, capacitor C ₇Meet amplifier IC ₆Negative input end, IC ₆The positive input terminal connecting to neutral, resistance R ₁₉With potentiometer RW ₃Be connected across amplifier IC after the series connection ₆Negative input end and output terminal between, potentiometer RW ₃Activity termination amplifier IC ₆Output terminal, capacitor C ₆Be connected across capacitor C ₇Input end and amplifier IC ₆Output terminal between, capacitor C ₇Input end through resistance R ₁₈Connecting to neutral, amplifier IC ₆Output connect IC with shaping link (8-3) for the second time ₆The output of another road through resistance R ₂₀, R ₂₁Connecting to neutral, resistance R ₂₀, R ₂₁Tie point and IC ₅Positive input terminal connect.

Shaping link (8-3) is by resistance R for the second time ₂₂～R ₂₆, base stage input diode D ₅, emitter-base bandgap grading output diode D ₆, switch triode T ₁, T ₂Form, wherein, first-harmonic is selected the output of link (8-2) through diode D ₅With switch triode T ₁Base stage connect switch triode T ₁Emitter through diode D ₆Connecting to neutral, triode T ₁Collector through resistance R ₂₃Connect the working power positive pole, triode T ₁Base stage through resistance R ₂₂Connect the working power positive pole, triode T ₁Collector through resistance R ₂₄, R ₂₅Connecting to neutral, resistance R ₂₄, R ₂₅Between draw a signal and triode T ₂Base stage connect T ₂The emitter connecting to neutral, T ₂Collector through resistance R ₂₆Connect with working power is anodal, from T ₂Collector draw the phase-locked loop of synchronizing signal to synchronized sampling starting impulse generator (8-4).

Synchronized sampling starting impulse generation link (8-4) is by phase-locked loop IC ₇, frequency divider IC ₈, d type flip flop IC ₉, monostalbe trigger IC ₁₀, IC ₁₁, IC ₁₂And the external circuits composition, wherein, the signal fs that is exported by shaping second time link (8-3) is connected to phase-locked loop IC through the input end fs ' of synchronized sampling starting impulse link (8-4) ₇14 ends, IC ₇Output terminal 4 ends and frequency divider IC ₈Input end 10 ends connect frequency divider IC ₈The output two paths of signals, one tunnel classified K switch ₁Feed back to phase-locked loop as the reference signal, one tunnel classified K switch ₂With d type flip flop IC ₉Input end 3 ends connect d type flip flop IC ₉7 terminations zero, IC ₉2,4 ends through resistance R ₂₇Connect the working power positive pole, IC ₉14 ends directly connect IC with the working power positive pole ₉1 end and monostalbe trigger IC ₁₂4 ends connect IC ₉5 ends and monostalbe trigger IC ₁₀Input end 10 ends connect and export a synchronous sampling pulse signal P _s, IC ₁₀9 terminations zero, IC ₁₀11,16 termination working power positive poles, IC ₁₀6,7 ends between cross-over connection one capacitor C ₈After resistance R ₁₈Connect the working power positive pole, IC ₁₀12 ends and monostalbe trigger IC ₁₁2 ends connect IC ₁₁3 termination working power positive poles, IC ₁₁14,15 ends between cross-over connection one capacitor C ₉After resistance R ₂₉Connect the working power positive pole, IC ₁₁1 termination zero, IC ₁₁13 ends export an A/D starting impulse signal P _a, monostalbe trigger IC ₁₂1 termination zero, another road output P of A/D conversion links _eWith IC ₁₂2 ends connect IC ₁₂14,15 ends between cross-over connection one capacitor C ₁₀After resistance R ₃₀With IC ₁₂16 termination working power positive poles.

Other each link is known technology.

On the instrument front panel, be provided with power switch (14), show overtone order key (15), reset key (16), overtone order key (17) is printed in control, synchronisation source options button (18), current range operating key (19), voltage range operating key (20), three-phase feeler switch (21), single-phase feeler switch (22), setup test key (23), self-check key (24), effective value is selected feeler switch (25), and feeler switch (26), harmonic current effective value display (27) are selected in frequency analysis, harmonic voltage effective value display (28), printer (29), demonstration overtone order key (15) can select any subharmonic to show, the state of each function key all has corresponding pilot lamp indication.

The instrument rear panel is provided with three-phase voltage signal input end (30-32), three-phase current signal input end (33-35), the top is six 6 feeble signal input ends (36-41) of measuring passage, its effect is that the signal of recording with magnetic tape station from the scene is analyzed harmonic wave in the laboratory by this mouthful input, topmost a row is three-phase voltage and three-phase current signal output terminal (42-47), this output terminal is applicable to be received on general purpose oscialloscope or the kymograph in order to the actual observation waveform, the left side (48) terminals can be realized getting in touch with other compunications, so that the data of frequency analysis are deposited or other processing, Far Left also has line printer interface (49), outer synchronous signal input end (50), tool housing earth terminal (51), main fuse base (52), power line socket (53).

The voltage signal range ability (effective value) of present embodiment: 30V, 60V, 120V, 240V, each retaining input can be up to 130% of ratings.

Current signal range ability (effective value): 1.5A, 3A, 6A, 12A, each grade input can be up to 130% of ratings.

It is 50 times that best result is analysed overtone order, and the printout selection of times is: 0～7 time; 0～13 time; 0～21 time; 0～31 time.

Display can select to show number of times be in 0～50 time arbitrarily time harmonic voltage and the effective value of harmonic current.

The course of work of instrument:

At first connect instrument power source, connect measured signal, two input ends that are about to input element connect tested three-phase voltage respectively, by measuring three-phase current, open instrument switch, instrument enters init state, the beginning self-check by Single-chip Controlling, is diagnosed one by one to each word of each function key and each functional block and display, after diagnosis is finished, whole pilot lamp glitter 10 times on the panel, if normal printer output normal signal, at this moment machine enters duty, manually button carries out the measurement function selection: comprise measurement range selection, synchronisation source is selected, and overtone order is selected, three-phase, single-phase selection, (HAR) selection of frequency analysis state or electric current and voltage effective value, active power, reactive power, power factor (UIP) is selected, and shows and the printing type selection.

Can press single-phase key when detecting single-phase harmonic signal, single-phase pilot lamp is bright, instrument is in single-phase measurement state, at this moment voltage and current 2 road signals of a phase are imported simultaneously, collection analysis, size according to input signal presets suitable range, instrument overload alarm lamp is bright when signal surpasses the range limit, must reset range this moment, carry out the selection of other functions simultaneously, if press (HAR) key, instrument is in the frequency analysis state, signal sampling and analog to digital conversion circuit each passage of starting working is on demand adopted after 128 sample points of foot, instrument promptly changes the error self-correcting of data over to, the imbalance that the zero point drift of components and parts and temperature cause in the signalling channel that rectifies an instrument, the sampled data of respectively organizing after having proofreaied and correct is successively carried out two real number base 2 rapid fourier changes, obtain the amplitude of each harmonic component, the phasing degree, and change print routine over to after calculating the number percent of each higher harmonic components with respect to fundametal compoment, go out the voltage of harmonic component by the format print of setting, current amplitude, the phasing degree, number percent.When pressing (UIP) key, instrument enters the measurement of voltage, current effective value, active power, reactive power and power factor, Single Chip Microcomputer (SCM) program control printer output voltage, current effective value, active power, reactive power and power factor.

If will carry out the three-phase real-time analysis, can press the three-phase key, the three-phase pilot lamp is bright, three-phase voltage and electric current 6 road signals are imported simultaneously, are gathered, deposit the data field simultaneously in, carry out two real number base 2 Fourier transformations respectively by phase sequence, obtain the each harmonic voltage and current effective value of each phase, print by phase sequence at last.Pressing (UIP) key measuring sequence is identically just undertaken by phase sequence with single-phase.

Claims (9)

1, real-time six passage harmonic analysis instruments, select link (2) by having the self-tuning signal that to drift about and to lack of proper care, has the measurement range selection link (3) that can make the range overload alarm, has the frequency-selecting processing links (4) that frequency can be selected within the required range, has the voltage that to gather through frequency-selecting, electric current also keeps the sampling of certain hour to keep link (5), can carry out analog-to-digital A/D conversion links (6) and printer (10), display (11), panel control (12), rectification working power (13), single-chip microcomputer compositions such as (9), it is characterized in that this instrument has six independently signal measurement passages, wherein, three real-time measurement voltage signal of passage are arranged, there are three passages to measure current signal in real time, can measure single-phase voltage, electric current or three-phase voltage, electric current, each passage is by having the input element (1) of gathering measured signal, signal is selected link (2), measurement range selection link (3), frequency-selecting processing links (4), sampling keeps link (5), connect successively before and after the A/D conversion links (6), synchronisation source with available synchronisation source selects link (7) to connect with the pre-shaping Synchronous Sampling Pulses Gremerator (8) that can make waveform carry out pre-shaping and to produce synchronous starting impulse, the two-way output of pre-shaping Synchronous Sampling Pulses Gremerator keeps link (5) to connect with the sampling of each passage, one the tunnel connects with the A/D conversion links (6) of each passage, the two-way of A/D conversion links (6) is exported one the tunnel and is connected with the reset gate of pre-shaping Synchronous Sampling Pulses Gremerator, one the tunnel connects with single-chip microcomputer (9), and signal is selected link (2), range controlling unit (3), synchronisation source is selected link (7), printer (10), display (11), panel control (12) all connects with single-chip microcomputer (9).

2, real-time six passage harmonic analysis instruments according to claim 1 is characterized in that its input element (1) is made up of ratio circuit (1-1), micro mutual inductor (1-2), prime amplifier (1-3), and wherein, ratio circuit is by resistance R ₁～R ₃Be composed in series two termination measured signals of resistance in series, micro mutual inductor B ₁Input end be connected across resistance R ₂Two ends, micro mutual inductor B ₁Two output terminals connect with prime amplifier.

3, according to claim 1,2 described real-time six passage harmonic analysis instruments, it is characterized in that its prime amplifier (1-3) is by proportion resistor R ₄～R ₇, limiter diode D ₁, D ₂, phase angle difference is regulated resistance R ₈, capacitor C ₁, potentiometer RW ₁, proportional amplifier IC ₁, output resistance R ₉Form, wherein, micro mutual inductor B ₁Two output terminals respectively through resistance R ₄, R ₅Meet amplifier IC ₁Negative, positive input end, amplifier IC ₁Negative, positive input end between two opposite polarity diode D of cross-over connection ₁, D ₂, amplifier IC ₁Positive input terminal through resistance R ₇Connecting to neutral, resistance R ₆Be connected across amplifier IC ₁Negative input end and output terminal between, amplifier IC ₁Output through resistance R ₈, potentiometer RW ₁, resistance R ₉Be connected to signal and select link (2), potentiometer RW ₁Movable end be connected on resistance R ₈Output terminal on, potentiometer RW ₁, resistance R ₉Between through capacitor C ₁Connecting to neutral.

4, real-time six passage harmonic analysis instruments according to claim 1 is characterized in that its synchronisation source selection link (7) is by synchronisation source code lock storage IC ₂With multi-way switch IC ₃Connect and form, wherein, multi-way switch IC ₃Be associated with alternative 1-4 road synchronisation source, latch IC ₂Connect with single-chip microcomputer.

5, real-time six passage harmonic analysis instruments according to claim 1, the pre-shaping synchronized sampling starting impulse generator (8) that it is characterized in that it is to be made into shaping first time link (8-1) into certain waveform by the voltage that will have harmonic wave, waveform after the shaping is carried out the first-harmonic that first-harmonic selects select link (8-2), the synchronized sampling starting impulse link (8-4) of the first-harmonic after selecting being carried out the shaping second time link (8-3) of shaping again and can produce synchronizing pulse is formed, wherein, shaping link (8-1) for the first time, first-harmonic is selected link (8-2), shaping link (8-3) for the second time, connect successively before and after the synchronized sampling starting impulse link (8-4).

6, according to claim 1,5 described real-time six passage harmonic analysis instruments, it is characterized in that its shaping first time link (8-1) is by resistance R ₁₀, capacitor C ₂, C ₃The high-frequency filter circuit of forming, amplitude limit voltage stabilizing diode D ₃, D ₄, proportion resistor R ₁₁, R ₁₂, proportional amplifier IC ₄, output resistance R ₁₄, resistance R ₁₃Form, wherein, select (7) next signal successively through high-frequency filter circuit, resistance R by synchronisation source ₁₁With amplifier IC ₄Negative input end connect resistance R ₁₂Be connected across amplifier IC ₄Negative input end and output terminal between, amplifier IC ₄The positive input terminal connecting to neutral, amplifier IC ₄Output terminal successively through resistance R ₁₃, R ₁₄Connect first-harmonic and select the input end of link (8-2), resistance R ₁₃, R ₁₄Between through the positive and negative amplitude limit voltage stabilizing diode D that connects ₃, D ₄Connecting to neutral.

7, according to claim 1,5 described real-time six passage harmonic analysis instruments, the first-harmonic that it is characterized in that it is selected link (8-2) and is made up of two-stage bandpass filter, and its two-stage bandpass filter is by resistance R ₁₅～R ₂₁, capacitor C ₄～C ₇, potentiometer RW ₂, RW ₃, amplifier IC ₅, IC ₆Form, wherein, the output of shaping link (8-1) is through capacitor C for the first time ₅Meet amplifier IC ₅Negative input end, resistance R ₁₅With potentiometer RW ₂Be connected on amplifier IC after the series connection ₅Negative input end and output terminal between, potentiometer RW ₂Activity termination amplifier IC ₅Output terminal, capacitor C ₄Be connected across capacitor C ₅Input end and amplifier IC ₅Output terminal between, capacitor C ₅Input end through resistance R ₁₆Connecting to neutral, IC ₅Output through resistance R ₁₇, capacitor C ₇Meet amplifier IC ₆Negative input end, IC ₆The positive input terminal connecting to neutral, resistance R ₁₉With potentiometer RW ₃Be connected across amplifier IC after the series connection ₆Negative input end and output terminal between, potentiometer RW ₃Activity termination amplifier IC ₆Output terminal, capacitor C ₆Be connected across capacitor C ₇Input end and amplifier IC ₆Output terminal between, capacitor C ₇Input end through resistance R ₁₈Connecting to neutral, amplifier IC ₆Output connect IC with shaping link (8-3) for the second time ₆The output of another road through resistance R ₂₀, R ₂₁Connecting to neutral, resistance R ₂₀, R ₂₁Tie point and IC ₅Positive input terminal connect.

8, according to claim 1,5 described real-time six passage harmonic analysis instruments, it is characterized in that its shaping second time link (8-3) is by resistance R ₂₂～R ₂₆, base stage input diode D ₅, emitter-base bandgap grading output diode D ₆, switch triode T ₁, T ₂Form, wherein, first-harmonic is selected the output of link (8-2) through diode D ₅With switch triode T ₁Base stage connect switch triode T ₁Emitter through diode D ₆Connecting to neutral, triode T ₁Collector through resistance R ₂₃Connect the working power positive pole, triode T ₁Base stage through resistance R ₂₂Connect the working power positive pole, triode T ₁Collector through resistance R ₂₄, R ₂₅Connecting to neutral, resistance R ₂₄, R ₂₅Between draw a signal and triode T ₂Base stage connect T ₂The emitter connecting to neutral, T ₂Collector through resistance R ₂₆Connect with working power is anodal, from T ₂Collector draw the phase-locked loop of synchronizing signal to synchronized sampling starting impulse generator (8-4).

9, according to claim 1,5 described real-time six passage harmonic analysis instruments, it is characterized in that synchronized sampling starting impulse generation link (8-4) is by phase-locked loop IC ₇, frequency divider IC ₈, d type flip flop IC ₉, monostalbe trigger IC ₁₀, IC ₁₁, IC ₁₂And the external circuits composition, wherein, by the signal f of shaping second time link (8-3) output _sInput end f through synchronized sampling starting impulse link (8-4) _s' be connected to phase-locked loop IC ₇14 ends, IC ₇Output terminal 4 ends and frequency divider IC ₈Input end 10 ends connect frequency divider IC ₈The output two paths of signals, one tunnel classified K switch ₁Feed back to phase-locked loop as the reference signal, one tunnel classified K switch ₂With d type flip flop IC ₉Input end 3 ends connect d type flip flop IC ₉7 terminations zero, IC ₉2,4 ends through resistance R ₂₇Connect the working power positive pole, IC ₉14 ends directly connect IC with the working power positive pole ₉1 end and monostalbe trigger IC ₁₂4 ends connect IC ₉5 ends and monostalbe trigger IC ₁₀Input end 10 ends connect and export a synchronous sampling pulse signal P _s, IC ₁₀9 terminations zero, IC ₁₀11,16 termination working power positive poles, IC ₁₀6,7 ends between cross-over connection one capacitor C ₈After resistance R ₁₈Connect the working power positive pole, IC ₁₀12 ends and monostalbe trigger IC ₁₁2 ends connect IC ₁₁3 termination working power positive poles, IC ₁₁14,15 ends between cross-over connection one capacitor C ₉After resistance R ₂₉Connect the working power positive pole, IC ₁₁1 termination zero, IC ₁₁13 ends export an A/D starting impulse signal P _a, monostalbe trigger IC ₁₂1 termination zero, another road output P of A/D conversion links _eWith IC ₁₂2 ends connect IC ₁₂14,15 ends between cross-over connection one capacitor C ₁₀After resistance R ₃₀With IC ₁₂16 termination working power positive poles.

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