CN102749542B - Power quality monitoring device based on double-velocity double-range sampling - Google Patents
Power quality monitoring device based on double-velocity double-range sampling Download PDFInfo
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- CN102749542B CN102749542B CN201210247188.0A CN201210247188A CN102749542B CN 102749542 B CN102749542 B CN 102749542B CN 201210247188 A CN201210247188 A CN 201210247188A CN 102749542 B CN102749542 B CN 102749542B
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Abstract
The invention relates to a power quality monitoring device based on double-velocity double-range sampling, belonging to the technical field of monitoring of the power quality of a power supply system. The power quality monitoring device comprises a wideband voltage transformer PT, a wideband CT (current transformer), a PLL (phase-locked loop), an ADC (analog-to-digital converter), a DSP (digital signal processor) and an ARM (microcontroller). According to the power quality monitoring device, double-velocity and double-range sampling is realized by utilizing a set of ADCs (analog-to-digital converters), namely, two velocities simultaneously exist and two ranges are automatically converted, so as to realize the effect completely same as the effect of two sets of ADCs and to realize stable measurement and transient capture, and the cost of the power quality monitoring device is lower than the costs of the two sets of ADCs. The power quality monitoring device based on double-velocity double-range sampling not only can be applied to a power quality monitoring device, but also can be applied to an ultrawide-range electric energy meter or an impaction load type electric energy meter, thus the electric energy meter can keep high precision of stable measurement (particularly tiny load), and any impaction electric energy can not be lost.
Description
Technical field
The invention belongs to electric power quality monitoring technical field, particularly the quality of power supply is measured and transient state capturing technology field.
Background technology
At present, the equipment for monitoring power quality of world-class level---as 3196 and 3198 of the F435 of Fluke and F1670, Hioki, can not only Measurement accuracy Steady State Power Quality (IEC61000-4-30-A level), can also accurately catch and record change be exceedingly fast (10MHz), the transient process of peak value high (6kV).And domestic equipment for monitoring power quality generally can only be measured Steady State Power Quality, can not accurately catch the transient process that variation is exceedingly fast, peak value is high.
In order to narrate conveniently, below by the measurement of stable state (comprising transient state) power quality index referred to as " steady state measurement ", by catch and record change be exceedingly fast, transient process that peak value is high is referred to as " transient state seizure ".Stable state (comprising transient state) power quality index mainly refers to voltage deviation, frequency departure, tri-phase unbalance factor, harmonic wave, a harmonic wave, voltage fluctuation, voltage flicker, voltage swell, voltage dip, voltage interruption, surge current etc., and transient process mainly refers to due to voltage spikes, the vibration of voltage heavy damping, transient current etc.
Should have steady state measurement accurately, have transient state accurately to catch again---be a very high requirement to equipment for monitoring power quality, its main difficulty is: the sampling of steady-state process and the sampling of transient process exist sharp-pointed contradiction.Here " sampling " comprises signal condition, sampling, maintenance and analog to digital conversion (ADC) etc.
Sampling rate that steady-state process requires is lower, range (scope) is less, and being applicable to the sampling rate of steady state measurement is generally that every cycle hundreds of point, range are generally several times of ratings.In the amplitude of measured signal, not under the prerequisite of no to scale, less range can obtain higher measuring accuracy---especially to small-signal.With regard to steady state measurement precision, sampling rate is unsuitable too low, but neither be more high better, because measuring accuracy and sampling rate are not linear relationships, the too high precise decreasing that sometimes causes on the contrary some Measurement Algorithm of sampling rate---as fft algorithm, IEC flickering algorithm etc.
, the transient process of electric system sometimes frequency exceedes tens times up to ratings of several MHz, peak value, and lower sampling rate may catch the true waveform less than transient process, and less range may ream the spike of transient process.Otherwise if sampling rate and range are determined in the requirement catching by transient state, steady state measurement precision will be sacrificed to some extent---especially when small-signal.Transient process that Here it is catches the sharp contradiction of measuring with steady-state process.
How does the equipment for monitoring power quality of above-mentioned world-class level solve this contradiction? from disclosed data not two kinds of ways: one is to equip two cover ADC simultaneously---the sampling of a set of execution low rate small-range, the sampling of another set of execution two-forty wide range, equipment two cover ADC just need two cover processor or the higher processors of performance, although so this way is pretty good, cost is higher; Another kind is manual switchover range and speed---while being switched to small-range and low rate, transient state seizure when steady state measurement, is switched to wide range and two-forty, can only gets one although the simple steady state measurement of this way and transient state catch the two.
Summary of the invention
Fundamental purpose of the present invention is to propose a kind of low cost and solves transient process and catch the equipment for monitoring power quality of the contradiction of measuring with steady-state process, can not only Measurement accuracy Steady State Power Quality, can also accurately catch and record and change the be exceedingly fast high transient process of peak value and the lower-cost equipment for monitoring power quality based on the sampling of dual rate double-range.
The present invention includes broadband voltage transformer (VT)
pT, broadband current transformer
cT, phase-locked loop pll, analog to digital converter ADC, digital signal processor DSP and micro controller ARM.Voltage transformer (VT)
pTwith broadband current transformer
cTbe respectively equipped with ac voltage signal and ac current signal input end, described phase-locked loop pll is provided with ac voltage signal input end, the output terminal of phase-locked loop pll is connected to an input end of analog to digital converter ADC, analog to digital converter ADC is connected with digital signal processor DSP, and digital signal processor DSP is connected with micro controller ARM; It is characterized in that: above-mentioned voltage transformer (VT)
pToutput terminal and voltage signal conditioner
vAconnect voltage signal conditioner
vAoutput terminal connect respectively voltage signal transient detection device
vCwith voltage signal variable-gain amplifier
vG, voltage signal transient detection device
vCoutput terminal be connected to an input end of digital signal processor DSP, voltage signal variable-gain amplifier
vGoutput terminal be connected to the input end of analog to digital converter ADC, at voltage signal variable-gain amplifier
vGinput and output side between an electronic switch in parallel
s u ; Above-mentioned current transformer
cToutput terminal and current signal conditioner
iAconnect current signal conditioner
iAoutput terminal connect respectively current signal transient detection device
iCwith current signal variable-gain amplifier
iG, current signal transient detection device
iCoutput terminal be connected to the input end of digital signal processor DSP, current signal variable-gain amplifier
iGoutput terminal be connected to the input end of analog to digital converter ADC, at current signal variable-gain amplifier
iGinput and output side between an electronic switch in parallel
s i ; Above-mentioned digital signal processor DSP has through analog to digital converter ADC with frequency
f ssampling obtain the Direct Sampling sequence of electric current and voltage and from Direct Sampling sequence every
kindividual data extract 1 data and are arranged in the controller of new double sampling sequence successively, wherein,
kfor being greater than 0 integer.
Principal character of the present invention is:
1, there are a transient detection device and a variable-gain amplifier at each forward path of analog to digital converter ADC, be used for automatic switching range, the gain of steady state measurement time-varying gain amplifier is 1---small-range, is switched to 1/ immediately once detect the gain of transient process variable-gain amplifier
l(
l> 1)---wide range.
2, a set of analog to digital converter ADC realizes two kinds of sampling rates, and one is high-speed sampling---and sample frequency is
f s, another is that low speed sampling---sample frequency is
f s/
k.Analog to digital converter ADC is with frequency
f ssampling obtains Direct Sampling sequence, and DSP takes out 1 by Direct Sampling sequence K and obtains sub-sampled sequences---and actual samples frequency is
f s/
k.Direct Sampling sequence catches for High-speed transient, and sub-sampled sequences is measured for Index For Steady-state.
The present invention adopts a set of analog to digital converter ADC to realize dual rate, double-range sampling simultaneously, two kinds of speed exist simultaneously, two kinds of automatic range switchings, its effect is just the same with equipment two cover analog to digital converter ADC, realized steady state measurement and transient state and caught and neglect neither, and cost is more much lower than equipment two cover ADC.
The present invention not only can be applicable to equipment for monitoring power quality, can also be used for super wide range electric energy meter or impact load electric energy meter, and it can make electric energy meter both keep the high precision (especially small load) of stable state metering, does not lose again any impact electric energy.
The present invention not only can be used for monophase system electric energy quality monitoring, also can be used for three-phase system electric energy quality monitoring.
In addition, voltage signal transient detection device of the present invention
vCcomprise reverser, two groups of voltage comparator circuits and a Sheffer stroke gate
aND, one end of described one group of voltage comparator circuit and voltage signal conditioner
vAoutput terminal connect, other end access Sheffer stroke gate
aNDan input end, one end of described another group voltage comparator circuit is by described reverser and voltage signal conditioner
vAoutput terminal connect, other end access Sheffer stroke gate
aNDanother input end, described Sheffer stroke gate
aNDoutput terminal be connected to digital signal processor DSP.
Current signal transient detection device of the present invention
iCcomprise reverser, two groups of current comparison circuits and a Sheffer stroke gate
aND, one end of described one group of current comparison circuit and current signal conditioner
iAoutput terminal connect, other end access Sheffer stroke gate
aNDan input end, one end of described another group current comparison circuit is by described reverser and current signal conditioner
iAoutput terminal connect, other end access Sheffer stroke gate
aNDanother input end, described Sheffer stroke gate
aNDoutput terminal be connected to digital signal processor DSP.
Voltage signal transient detection device
vCwith current signal transient detection device
iCall based on same principle of work.
With voltage signal transient detection device
vCprinciple of work is example: phase inverter completes the anti-phase of negative half period voltage waveform; Directly and voltage signal conditioner
vAone group of voltage comparator circuit connecting of output terminal complete the instantaneous value comparison of the positive half cycle of AC signal, by reverser and voltage signal conditioner
vAanother group voltage comparator circuit of connecting of output terminal complete the instantaneous value comparison of AC signal negative half period.
In the time that the instantaneous value of positive half cycle and negative half period does not exceed threshold value,
vCoutput low level---control electronic switch
s u closed---amplifier
vGgain be 1;
vCoutput level deliver to the switching value input port of DSP simultaneously---allow the current amplifier of DSP perception
vGgain be 1.
In the time that the instantaneous value of positive half cycle or negative half period exceeds threshold value,
vCoutput high level---control electronic switch
s u disconnect---amplifier
vGgain be 1/
l u ;
vCoutput level deliver to the switching value input port of DSP simultaneously---allow the current amplifier of DSP perception
vGgain be 1/
l u .
Brief description of the drawings
Fig. 1 is a kind of structural principle block diagram of the present invention.
Fig. 2 is A phase voltage signal transient detection device of the present invention
vCcircuit theory diagrams.
Fig. 3 is A phase current signal transient detection device of the present invention
iCcircuit theory diagrams.
Embodiment
one, concrete structure of the present invention:
In Fig. 1, the input of monitoring device is three-phase voltage signal and the three-phase current signal of certain monitoring point of electric system, for simplicity, has only drawn in detail A phase structure in figure, and B, the rest may be inferred for C phase structure, narration be below also taking A mutually as example, the rest may be inferred mutually for B, C.Just become mutually single-phase electric energy quality monitoring device theory diagram if remove B phase and C.
Phase-locked loop pll is provided with ac voltage signal input end, and the output terminal of phase-locked loop pll is connected to the input end of analog to digital converter ADC, and analog to digital converter ADC is connected with digital signal processor DSP, and digital signal processor DSP is connected with micro controller ARM.
Analog to digital converter ADC adopts more than 16 multipath high-speed analog to digital converter.
Digital signal processor DSP adopts more than 32 digital signal processor.
Phase-locked loop pll is combined by voltage controlled oscillator and frequency divider, and pcb board at least adopts 4 laminates.
Three-phase electric energy quality monitoring device ADC is input as 6 tunnels (3 phase voltages, 3 phase currents), and single-phase electric energy quality monitoring device ADC is input as 2 tunnels (1 phase voltage, 1 phase current).
Digital signal processor DSP has through analog to digital converter ADC with frequency
f ssampling obtain the Direct Sampling sequence of voltage and current and every
kindividual data extract 1 data and are arranged in the controller of new double sampling sequence successively, wherein,
kfor being greater than 0 integer.
Broadband voltage transformer (VT)
pTbe provided with ac voltage signal input end, voltage transformer (VT)
pToutput terminal and voltage signal conditioner
vAconnect voltage signal conditioner
vAoutput terminal connect respectively voltage signal transient detection device
vCwith voltage signal variable-gain amplifier
vG, voltage signal transient detection device
vCoutput terminal be connected to the input end of digital signal processor DSP, voltage signal variable-gain amplifier
vGoutput terminal be connected to the input end of analog to digital converter ADC, at voltage signal variable-gain amplifier
vGinput and output side between an electronic switch in parallel
s u .
Broadband current transformer
cTbe provided with ac current signal input end, current transformer
cToutput terminal and current signal conditioner
iAconnect current signal conditioner
iAoutput terminal connect respectively current signal transient detection device
iCwith current signal variable-gain amplifier
iG, current signal transient detection device
iCoutput terminal be connected to the input end of digital signal processor DSP, current signal variable-gain amplifier
iGoutput terminal be connected to the input end of analog to digital converter ADC, at current signal variable-gain amplifier
iGinput and output side between an electronic switch in parallel
s i .
A phase voltage signal
u a (t)through voltage transformer (VT)
pT a deliver to voltage signal conditioner
vA a ,
vA a output
ū a (t)divide two-way: voltage signal variable-gain amplifier is delivered on a road
vG a , another road delivers to voltage signal transient detection device
vG a ,
vG a output control
vG a gain,
vG a output deliver to analog to digital converter ADC,
pT a ,
vA a ,
vC a ,
vG a be called together the 1 road forward path of analog to digital converter ADC.
The standard configuration of three-phase electric energy quality monitoring device ADC is 6 tunnels (3 road voltages, 3 road electric currents), and A phase voltage is 1 tunnel in 6 tunnels, and the 6 road forward path structures of analog to digital converter ADC are identical.
Analog to digital converter ADC is converted into digital quantity by simulating signal and delivers to digital signal processor DSP, micro controller ARM(or use other processor) complete data storage, analysis, demonstration, teletransmission.
The sample frequency of analog to digital converter ADC is
f s, the sampling period is
t s =1/
f s.The
nthe A phase voltage sampled data of individual sampling period DSP storage is
ū * a (
n), continuously sampled data form A phase voltage Direct Sampling sequence
ū * a (
n) (n=1,2,3 ...).
By voltage signal transient detection device
vC a and electronic switch
s ua control voltage signal variable-gain amplifier
vG a gain be 1 or 1/
l u (
l u > 1): when
s ua when connection
vG a gain be 1, and
s ua when disconnection,
vG a gain be 1/
l u .
vC a will
ū a (t)with predefined positive and negative threshold level
u + with
u - compare, when
u - < ū a (t) < U + time
vC a output low level---control
s ua connect, otherwise
vC a output high level---control
s ua disconnect.
u + with
u - it is respectively the upper and lower boundary of the ADC input analog amount range of linearity.
vC a output level deliver to the switching value input port of DSP simultaneously
p ua , allow DSP perception variable-gain amplifier
vG a current gain.
A phase current signal
i a (
t) through current transformer
cT a deliver to current signal conditioner
lA a ,
lA a output
divide two-way: a road is through current signal variable-gain amplifier
iG a deliver to ADC, current signal transient detection device is delivered on another road
iG a ,
iG a output control
iG a gain,
nthe A phase current sampling data of individual sampling period DSP storage are
, A phase current Direct Sampling sequence is
.
with
it is all the digital quantity with sign symbol.
By transient detection device
iC a and electronic switch
s ia control current signal variable-gain amplifier
iG a gain be 1 or 1/
l i (
l i > 1): when
s ia when connection
iG a gain be 1, when
s ia when disconnection
iG a gain be 1/
l i .
iC a will
with threshold level
u + with
u - compare, when
time
iC a output low level---control
s ia connect, otherwise
iC a output high level---control
s ia disconnect.
iC a output level deliver to the switching value input port of DSP simultaneously
p ia , allow DSP perception variable-gain amplifier
iG a current gain.
A phase voltage signal transient detection device
vC a structure as shown in Figure 2,
vC a comprise reverser, two groups of voltage comparator circuits and a Sheffer stroke gate
aND 1, one end of one group of voltage comparator circuit and voltage signal conditioner
vA a output terminal connect, other end access Sheffer stroke gate
aND 1an input end, one end of another group voltage comparator circuit is by described reverser and voltage signal conditioner
vA a output terminal connect, other end access Sheffer stroke gate
aND 1another input end, Sheffer stroke gate
aND 1signal output part be connected on the I/O mouth of digital signal processor DSP.
Wherein
cM 1with
cM 2comparer,
cM 1complete AC signal
ū a (t)the comparison of positive half cycle,
cM 2complete AC signal
ū a (t)the comparison of negative half period, phase inverter
rP 1complete
ū a (t)anti-phase.Resistance
r 12with
r 13the voltage divider forming provides positive dirction threshold value
u + , resistance
r 14with
r 15the voltage divider forming provides negative direction threshold value
u - .When
u - < ū a (t) < U + time
cM 1with
cM 2all export high level, through Sheffer stroke gate
aND 1rear output low level---
y ua=0; When
ū a (t)>
u + time
cM 1output low level, when
ū a (t) < U - time
cM 2output low level, Sheffer stroke gate
aND 1any be input as low level and all export high level---
y ua=1.Comparer, phase inverter, Sheffer stroke gate all adopt high-frequency element, resistance
r 12,
r 13,
r 14with
r 15all adopt precision resistance.
B, C phase voltage signal transient detection device
vC b ,
vC c structure with
vC a identical.
A phase current signal transient detection device
iC a structure as shown in Figure 3,
iC a comprise reverser, two groups of current comparison circuits and a Sheffer stroke gate
aND 1, one end of one group of current comparison circuit and current signal conditioner
iA a output terminal connect, other end access Sheffer stroke gate
aND 1an input end, one end of another group current comparison circuit is by described reverser and current signal conditioner
iA a output terminal connect, other end access Sheffer stroke gate
aND 2another input end, Sheffer stroke gate
aND 2signal output part be connected on the I/O mouth of digital signal processor DSP.
B, C phase current signal transient detection device
iC b ,
iC c structure with
iC a identical.
two, the automatic double-dial principle of work of the present invention:
1, principle is determined in gain
According to the principle of ADC, the digital quantity of ADC output is directly proportional (ignoring quantization error) to the analog quantity of input, and ADC input analog amount has a range of linearity---
u - ～U + , in the time that input analog amount is AC signal
u - =-
u + .
u - with
u + corresponding digital quantity is respectively
d - with
d + , such as, 16 ADC's
d - =8000
h,
d + =7
fFFH.
If
pT aadd
vA a full gain be
g ua (
v/
v)---
ū a (t)=G ua u a (t), establish again voltage steady state measurement scope (effective value) and be
u min~
u max, so definite
g ua principle be exactly
---be the range of linearity that steady state measurement signal does not exceed ADC, wherein,
that voltage waveform coefficient (is generally got
=2～3).This means, do not occur going beyond the scope
u - ~
u + transient process time ADC conversion digital quantity one fix on D
- ~
d + between.
If
cT aadd
lA afull gain be
g ia (
v/A)---
, establish again electric current steady state measurement scope (effective value) and be
i min ~
i max , so definite
g ia principle be exactly
,
that current wave factor (is generally got
=3～4).
Due to voltage transient peak value generally than
if much bigger---do not dwindle the range of linearity that just may exceed ADC, so, when occurring going beyond the scope
u - ~
u + transient voltage time
vG a gain just become 1/
l u (
l u > 1)---ensure that the voltage that is added to ADC does not exceed the range of linearity of ADC.If need the maximum voltage transient peak catching to be
u peak , determine
l u principle should be
g ua u peak /
l u < U + .
In like manner, establishing the maximum current transient peak that need to capture is
i peak , determine
l i principle be
g ia i peak /
l i < U + .
, data calculate
Due to
s ua while switching on and off, the gain of ADC forward path is different, so, when the input port of DSP
p ua =0---
s ua connect (
vG a =1), time, the A phase voltage sampled value that DSP reads from ADC is directly stored as
ū * a (
n); When the input port of DSP
p ua =1---
s ua disconnect (
vG a =1/
l u ) time, the A phase voltage sampled value that DSP reads from ADC will expand
l u doubly, be stored as
ū * a (
n).Obviously, get
l u it is the calculated amount that 2 whole power can reduce DSP.
Be not difficult to find out digital quantity
ū * a (
n) corresponding analog quantity
ū a (
t), and input voltage (tested voltage)
u a (
t) corresponding digital quantity should be---
u * a (
n)=
ū * a (
n)/
g ua .
In like manner, when the input port of DSP
p ia =0---
s ia connect (
iG a =1), time, the A phase current sampling value that DSP reads from ADC is directly stored as
; When the input port of DSP
p ia =1---
s ia disconnect (
iG a =1/
l i ) time, the A phase current sampling value that DSP reads from ADC will expand
l i doubly, be stored as
.Obviously, get
l i it is the calculated amount that 2 whole power can reduce DSP.
Be not difficult to find out digital quantity
corresponding analog quantity
, and input current (tested electric current)
i a (
t) corresponding digital quantity should be---
.
three, automatic dual-speed rate principle of work of the present invention:
1, determining of sample frequency
DSP to the sample frequency of voltage, current signal is
f s ,
f s main consideration steady state measurement and transient state catch the demand of two aspects, if the suitable sample frequency of steady state measurement is
f r , transient state catch highest frequency be
f t ,
f s should meet following condition: (1) simultaneously
, (2)
f s =
kf r (
kfor positive integer), (3)
f r for the integral multiple of mains frequency.
Why get
to be in order to guarantee to catch and reappear frequency
f t transient process, why get
f s =
kf r the realization in order to realize dual rate sampling (vide infra ' 2) dual rate '), why get
f r for the integral multiple of mains frequency is the related request in order to meet IEC61000-4-30 standard.
Synchronized sampling is controlled by PLL and DSP, and PLL is phaselocked loop, and its effect is exactly to ensure that sample frequency is the integral multiple of mains frequency---i.e. and ' synchronized sampling ', the maximum synchronous error that IEC61000-4-30 standard allows is 3/10000ths.Because sample frequency
f s very high, so above-mentioned condition can meet simultaneously.
, dual rate realization
Transient state catches and Direct Sampling sequence used in record (record ripple)
with
so,, the actual samples frequency that transient state catches is exactly
f s .
Steady state measurement will be to Direct Sampling sequence
with
carry out '
ktake out 1 ' sampling, from Direct Sampling sequence
in every
kindividual data extract successively 1 data and are arranged in sub-sampled sequences
, from Direct Sampling sequence
in every
kindividual data extract successively 1 data and are arranged in sub-sampled sequences
, the calculating of steady state measurement is based on sub-sampled sequences
with
.Because
f s =
kf r so the actual samples frequency of steady state measurement is
f r .This has just realized dual rate sampling.
four, illustrate:
Certain equipment for monitoring power quality requires: steady state voltage measurement range (effective value) is 10～600
v, voltage waveform coefficient
=3; Steady-state current measurement range (effective value) is 0.06～6
a, current wave factor
=4; Steady state measurement sampling rate is every cycle 256 points.
The maximum voltage peak value that transient state catches is
u peak =6000
v, the maximum current peak that transient state catches is
i peak =180
a, transient state catches highest frequency and is not less than
f t =1
mHz.
If the ADC input analog amount range of linearity is-1.0
v～+1.0
v, by formula
,
, get
; Press formula
,
, get
g ia =0.04(
v/
a).
Press formula
,
, get
l u =4---the maximum voltage peak value that transient state catches can reach 7840
vabove; Press formula
,
, get
l i =8---the maximum current peak that transient state catches can reach 196
aabove.
If mains frequency is
f 1, by above-mentioned definite sample frequency
f s three conditions, desirable sample frequency
---be every cycle 65536 points, the highest frequency that at this moment transient state catches can reach approximately 1.6383
mHz.Because
so, sampling rate
.
Notice: sample frequency
f s be not constant---become---this with mains frequency be IEC61000-4-30 standard-required, constant is times frequency ratio and sampling rate,
f s times frequency ratio be 65536,
f r times frequency ratio be 256, frequency multiplication is realized by PLL.
Claims (3)
1. the equipment for monitoring power quality based on the sampling of dual rate double-range, comprises broadband voltage transformer (VT)
pT, broadband current transformer
cT, phase-locked loop pll, analog to digital converter ADC, digital signal processor DSP and micro controller ARM, described voltage transformer (VT)
pTsummation current transformer
cTbe respectively equipped with ac voltage signal and ac current signal input end, described phase-locked loop pll is provided with ac voltage signal input end, the output terminal of phase-locked loop pll is connected to an input end of analog to digital converter ADC, analog to digital converter ADC is connected with digital signal processor DSP, and digital signal processor DSP is connected with micro controller ARM; It is characterized in that:
Described voltage transformer (VT)
pToutput terminal and voltage signal conditioner
vAconnect voltage signal conditioner
vAoutput terminal connect respectively voltage signal transient detection device
vCwith voltage signal variable-gain amplifier
vG, voltage signal transient detection device
vCoutput terminal be connected to variable-gain amplifier
vGcontrol end and the input end of digital signal processor DSP, voltage signal variable-gain amplifier
vGoutput terminal be connected to the input end of analog to digital converter ADC, at voltage signal variable-gain amplifier
vGinput and output side between an electronic switch in parallel
s u ; Variable-gain amplifier
vGgain by transient detection device
vCand electronic switch
s u control: transient detection device when steady state measurement
vCoutput low level, makes electronic switch
s u connect variable-gain amplifier
vGgain be 1, electronic switch
s u disconnect variable-gain amplifier
vGgain be 1/
l u ;
Described current transformer
cToutput terminal and current signal conditioner
iAconnect current signal conditioner
iAoutput terminal connect respectively current signal transient detection device
iCwith current signal variable-gain amplifier
iG, current signal transient detection device
iCoutput terminal be connected to variable-gain amplifier
iGcontrol end and the input end of digital signal processor DSP, current signal variable-gain amplifier
iGoutput terminal be connected to the input end of analog to digital converter ADC, at current signal variable-gain amplifier
iGinput and output side between an electronic switch in parallel
s i ; Variable-gain amplifier
iGgain by transient detection device
iCand electronic switch
s i control: transient detection device when steady state measurement
iCoutput low level, makes electronic switch
s i connect variable-gain amplifier
iGgain be 1, electronic switch
s i disconnect variable-gain amplifier
iGgain be 1/
l u ;
Above-mentioned digital signal processor DSP has through analog to digital converter ADC with frequency
f ssampling obtain the Direct Sampling sequence of electric current and voltage and from Direct Sampling sequence every
kindividual data extract 1 data and are arranged in the controller of new double sampling sequence successively, wherein,
kfor being greater than 0 integer.
2. equipment for monitoring power quality according to claim 1, is characterized in that described voltage signal transient detection device
vCcomprise reverser, two groups of voltage comparator circuits and a Sheffer stroke gate
aND, one end of described one group of voltage comparator circuit and voltage signal conditioner
vAoutput terminal connect, other end access Sheffer stroke gate
aNDan input end, one end of described another group voltage comparator circuit is by described reverser and voltage signal conditioner
vAoutput terminal connect, other end access Sheffer stroke gate
aNDanother input end, described Sheffer stroke gate
aNDsignal output part be connected to digital signal processor DSP.
3. equipment for monitoring power quality according to claim 1, is characterized in that described current signal transient detection device
iCcomprise reverser, two groups of current comparison circuits and a Sheffer stroke gate
aND, one end of described one group of current comparison circuit and current signal conditioner
iAoutput terminal connect, other end access Sheffer stroke gate
aNDan input end, one end of described another group current comparison circuit is by described reverser and current signal conditioner
iAoutput terminal connect, other end access Sheffer stroke gate
aNDanother input end, described Sheffer stroke gate
aNDsignal output part be connected to digital signal processor DSP.
Priority Applications (1)
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| RU2690860C1 (en) * | 2018-06-23 | 2019-06-06 | Дмитрий Валерьевич Хачатуров | High-voltage measuring device and method |
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