CN105676008A - Digital electric field sensor - Google Patents

Digital electric field sensor Download PDF

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Publication number
CN105676008A
CN105676008A CN201610028627.7A CN201610028627A CN105676008A CN 105676008 A CN105676008 A CN 105676008A CN 201610028627 A CN201610028627 A CN 201610028627A CN 105676008 A CN105676008 A CN 105676008A
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electric field
reference signal
phase
input channel
signal input
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CN105676008B (en
Inventor
赵录兴
崔勇
陆家榆
鞠勇
袁海文
吴桂芳
谢莉
刘元庆
吕建勋
陈凯
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State Grid Corp of China SGCC
Beihang University
China Electric Power Research Institute Co Ltd CEPRI
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State Grid Corp of China SGCC
Beihang University
China Electric Power Research Institute Co Ltd CEPRI
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/12Measuring electrostatic fields or voltage-potential
    • G01R29/14Measuring field distribution

Abstract

The invention provides a digital electric field sensor, including: an electric field induction system which converts a synthesized electric field under a high-voltage direct-current transmission line into induction current to be output to a measured signal input channel; a reference signal generation system which generates square signals having the same frequency and same phase as the induction current as reference signals to be output to a reference signal input channel; the measured signal input channel which amplifies, filters and performs AD sampling on the induction current and then outputs the induction current to a microprocessing module; the reference signal input channel used for outputting a synchronous reference signal sequence to the microprocessing module after AD sampling is performed on the reference signals; and the microprocessing module which calculates the amplitude and phase of the synthesized electric field under the high-voltage direct-current transmission line after two phase-sensitive detectors are utilized to perform phase-sensitive detection on an input discrete sequence and the synchronous reference signal sequence. The technical scheme provided by the invention can completely overcome the defects of output drift, sensing characteristic inconsistency and the like which exist in a traditional analog electric field sensor, and greatly improves measurement accuracy and reliability of long-term use.

Description

A kind of digital electric field sensor
Technical field
The present invention relates to a kind of electric-field sensor, in particular to a kind of digital electric field sensor measured suitable in ground total electric field under HVDC transmission line.
Background technology
Along with the mushroom development of China's UHV Transmission Engineering, the electromagnetic environment problem of transmission line of electricity periphery attracts people's attention day by day. Under increasingly strict Environmental Protection Situation, the electromagnetic environment of transmission line of electricity affects one of the key factor of its application and development by becoming, and is circuit design and the key technical problem that must take in running. Electric field intensity is an important parameter of electromagnetic environment, it is carried out accurately detection significant.
Traditional analog DC electric field sensor realizes based on the principle of lock-in amplifier, and the small-signal that electric-field sensor can be detected by lock-in amplifier carries out extracting and amplifying, thus identifying useful signal in noise. And phase sensitive detection is the core realizing locking amplification, on the one hand, input signal is carried out related operation with the reference signal of frequency, obtain only relevant with the noise component(s) of the same frequency of measured signal and measured signal correlation result. Major part noise is because of uncorrelated with it, thus being suppressed greatly, improves the signal to noise ratio of detection. On the other hand, phase sensitive detection achieves the discriminating to tested direction of an electric field, plays the effect of phase discriminator.
The structure of current analog electric-field sensor lock-in amplifier is as it is shown in figure 1, formed by measuring input signal channel part, reference signal input channel part and analog correlator three part.
Measure the input signal channel sinusoidal signal to input to be amplified, filter part interference and noise then through band filter, to improve the dynamic range of phase-sensitive detection.
Reference signal selection sinusoidal signal or square-wave signal, with measured signal with frequency homophase. Reference signal is amplified or decays by reference signal input channel, to adapt to the phase sensitive detector requirement to amplitude.
Analog correlator is made up of analog phase-sensitive detector (APSD) and analog low pass filter (ALPF), and input signal and reference signal are done multiplying and export by phase-sensitive detector. Low-pass filtering link filters the non-DC components in phase sensitive detection output, makes to be output as stable direct current.
In analog electric-field sensor, input measurement signal m (t) is sinusoidal wave, and reference signal r (t) is square wave, if the amplitude of square wave is Vr, sinusoidal wave amplitude is Vm, and both angular frequencies are equal, are ω0, the initial phase of θ and φ respectively input measurement signal and reference signal. Then input measurement signal is represented by: m (t)=Vmsin(ω0T+ θ); Reference Signal square wave r (t) carries out fourier progression expanding method, is represented by:After phase-sensitive detector, x (t) and r (t) product up(t) be:
u p ( t ) = 2 V m V r π Σ n = 1 ∞ ( - 1 ) n + 1 2 n - 1 cos [ ( 2 n - 2 ) ω 0 t - ( θ - φ ) ] - 2 V m V r π Σ n = 1 ∞ ( - 1 ) n + 1 2 n - 1 cos ( 2 nω 0 t + θ + φ )
After analog low pass filter, in above formula, the difference frequency term of n > 1 and all and frequency item are filtered out, and only retain the difference frequency term of n=1, namely DC quantity, finally export uoFor:
Generally, make the phase difference θ-φ of reference signal r (t) and input measurement signal m (t) equal to zero by regulating slide rheostat, thus obtaining maximum outputNow sensor has peak response, and this process is generally completed by manual adjustment phase-shift circuit. But due to manual operation error, phase contrast is adjusted to zero exactly bigger difficulty. The phase contrast opposite sex that personal error causes, causes the sensitivity of sensor to have dispersibility. Additionally, the adjustment of phase place is realized by slide rheostat, and there is drift characteristic in slide rheostat itself, and long-time use can cause the drift of phase angle, makes the sensitivity of sensor offset, causes measurement error.
Summary of the invention
In order to solve above-mentioned deficiency existing in prior art, the present invention provides a kind of digital electric field sensor measured suitable in total electric field under HVDC transmission line, to improve the data accuracy that under HVDC transmission line, total electric field is measured.
Present invention provide the technical scheme that a kind of digital electric field sensor, it thes improvement is that, described electric-field sensor includes electric field induction system, reference signal produces system, measured signal input channel, reference signal input channel and micro treatment module; Wherein:
Electric field induction system, its outfan is connected with measured signal input channel, for measuring the total electric field under HVDC transmission line, and it is transferred to described measured signal input channel after described total electric field is converted into faradic current m (t) of frequency and amplitude stability;
Reference signal produces system, its outfan is connected with reference signal input channel, for producing with described faradic current m (t) with the square-wave signal of frequency homophase as reference signal r (t), and described reference signal r (t) is transferred to reference signal input channel;
Measured signal input channel, its outfan is connected with micro treatment module, for described faradic current m (t) being amplified, filter and after AD sampling, exports discrete series m (k) to described micro treatment module;
Reference signal input channel, its outfan is connected with micro treatment module, and after described reference signal r (t) is carried out AD sampling, output synchronous reference signal sequence s (k) is to described micro treatment module;
Micro treatment module, after discrete series m (k) and synchronous reference signal sequence s (k) being carried out phase sensitive detection with two phase-sensitive detectors, calculates amplitude and the phase place of total electric field under HVDC transmission line.
Preferably, described electric-field sensor also includes wireless radio frequency modules, and the input of described wireless radio frequency modules is connected with described micro treatment module, for the amplitude of total electric field under described HVDC transmission line and phase place are sent to host computer in real time and are displayed.
Preferably, described electric field induction system includes motor and the photoelectric code disk, induction blade and the shielding blade that are sequentially arranged on described motor axle;
Described shielding blade is followed described motor shaft and is done cycle rotation, and the electric field in fixed described induction blade carries out periodically shielding; Described induction blade produces faradic current m (t) of frequency and amplitude stability, is transferred to described measured signal input channel.
Further, reference signal produces the photoswitch that system includes installing on described photoelectric code disk and the shaping circuit connecting described photoswitch outfan, and described shaping circuit is connected with described reference signal input channel;
Described photoelectric code disk is followed described motor shaft and is rotated; Described photoswitch produces pulse signal, by the velocity of rotation of photoelectric code disk described in pulse signal detection, and produces standard block signal r (t) as reference signal transmission to described reference signal input channel by described shaping circuit.
Further, described motor connects with the circuit for controlling motor being connected with electric power system; Described electric power system output 3.3V regulated power supply powers to described circuit for controlling motor, and the voltage stabilizing chip upc1470 of described circuit for controlling motor controls described motor speed.
Preferably, described measured signal input channel includes the amplifier, wave filter and the AD sampler that are sequentially connected with, and described amplifier exports to described wave filter after amplifying faradic current m (t); After described faradic current is filtered by described wave filter, output is to an AD sampler; After the described AD sampler faradic current to receiving carries out AD sampling, output discrete series m (k) is to described micro treatment module.
Preferably, described reference signal input channel includes the 2nd AD sampler, and described 2nd AD sampler exports synchronous reference signal sequence s (k) to described micro treatment module after described reference signal r (t) carries out AD sampling; The described 2nd AD sampler integral multiple that hits is 4 within each cycle.
Preferably, described micro treatment module includes phase shifter, the first phase-sensitive detector, the second phase-sensitive detector, the first low pass filter, the second low pass filter, electric field magnitude computing module and direction of an electric field computing module; The outfan of described reference signal input channel connects the input of described phase shifter and the input of described first phase-sensitive detector respectively; The outfan of described measured signal input channel connects another input of described first phase-sensitive detector and the input of described second phase-sensitive detector respectively; The outfan of described phase shifter connects another input of described second phase-sensitive detector; The outfan of described first phase-sensitive detector connects the input of described first low pass filter; The outfan of described second phase-sensitive detector connects the input of described second low pass filter; The outfan of described first low pass filter and the outfan of described second low pass filter connect the input of described electric field magnitude computing module and the input of described direction of an electric field computing module respectively.
Further, the mobile 90 degree of phase angles of synchronous reference signal sequence s (k) that described reference signal input channel is exported by the described phase shifter, export to described second phase-sensitive detector after forming orthogonal reference sequence c (k);
Discrete series m (k) and described synchronous reference signal sequence s (k) are done multiplying by described first phase-sensitive detector, obtain at discrete digital signal I (k) of time domain and export to described first low pass filter, I (k)=m (k) * s (k);
Discrete series m (k) and described orthogonal reference sequence c (k) are done multiplying by described second phase-sensitive detector, obtain at discrete digital signal Q (k) of time domain and export to described second low pass filter, Q (k)=m (k) * c (k);
The DC component X (k) remained is exported to described electric field magnitude computing module and described direction of an electric field computing module after filtering the higher hamonic wave interference in digital signal I (k) by described first low pass filter respectively;
The DC component Y (k) remained is exported to described electric field magnitude computing module and described direction of an electric field computing module after filtering the higher hamonic wave interference in digital signal Q (k) by described second low pass filter respectively;
Described electric field magnitude computing module equation below (1) calculates the amplitude of total electric field under HVDC transmission line
E ‾ = X ( k ) 2 + Y ( k ) 2 / V r - - - ( 1 )
Wherein VrThe amplitude of square-wave signal produced by reference signal generation system;
Described direction of an electric field computing module equation below (2) calculates the phase of total electric field under HVDC transmission line:
φ = arctan ( Y ( k ) X ( k ) ) - - - ( 2 )
Further, described first low pass filter and described second low pass filter are the low pass filter based on arithmetic equal value, described Vr=1.
Compared with immediate prior art, the present invention has following marked improvement:
The more common lock-in amplifier of micro treatment module in digital electric field sensor provided by the invention adds an orthogonal phase-sensitive detector (PSD2), the operation principle of two phase-sensitive detectors (PSD1 and PSD2) is identical, simply add one 90 ° phase shifters at the input of orthogonal phase-sensitive detector, carry out a phase sensitive detection after its Reference Signal phase shift 90 ° again with measured signal to obtain orthogonal reference signal. Utilize double; two phase-sensitive detector to constitute lock-in amplifier and can provide quadrature component and in-phase component to do vector calculus simultaneously, such that it is able to realize the measurement of the amplitude to measured signal and phase place. Therefore, overcome the phase contrast opposite sex that personal error causes, phase contrast is adjusted to zero exactly, it is to avoid the sensitivity of sensor has dispersibility. Avoid slide rheostat itself there is drift characteristic additionally, eliminate the slide rheostat regulating phase place, it is therefore prevented that the long-time drift being likely to phase angle when using, it is to avoid error. The use of digital processing mode simultaneously, decreases the use (such as operational amplifier, slide rheostat) of the analog device of separate type, improves sensor characteristics concordance.
Accompanying drawing explanation
Fig. 1 is the structural representation of analog electric-field sensor lock-in amplifier in prior art;
Fig. 2 is the structural representation of digital electric field sensor provided by the invention;
Fig. 3 is the structural representation of electric field induction system;
Fig. 4 is the structural representation of micro treatment module;
Fig. 5 is that square wave reference signal is through the filtered amplitude-frequency response schematic diagram of low pass filter.
Wherein 1-shielding blade; 2-induction blade; 3-photoswitch; 4-photoelectric code disk; 5-motor.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
In order to thoroughly understand the embodiment of the present invention, detailed structure will be proposed in following description. Obviously, the execution of the embodiment of the present invention is not limited to the specific details that those skilled in the art has the knack of. Presently preferred embodiments of the present invention is described in detail as follows, but except these detailed descriptions, the present invention can also have other embodiments.
The present invention provides a kind of digital electric field sensor, and its structure is as in figure 2 it is shown, described electric-field sensor includes:
Electric field induction system, its outfan is connected with measured signal input channel, for measuring the total electric field under HVDC transmission line, and it is transferred to described measured signal input channel after described total electric field is converted into faradic current m (t) of frequency and amplitude stability;
Reference signal produces system, its outfan is connected with reference signal input channel, for producing with described faradic current m (t) with the square-wave signal of frequency homophase as reference signal r (t), and described reference signal r (t) is transferred to reference signal input channel;
Measured signal input channel, its outfan is connected with micro treatment module, for described faradic current m (t) being amplified, filter and after AD sampling, exports discrete series m (k) to described micro treatment module;
Reference signal input channel, its outfan is connected with micro treatment module, and after described reference signal r (t) is carried out AD sampling, output synchronous reference signal sequence s (k) is to described micro treatment module;
Micro treatment module, after discrete series m (k) and synchronous reference signal sequence s (k) being carried out phase sensitive detection with two phase-sensitive detectors, calculates amplitude and the phase place of total electric field under HVDC transmission line; In micro treatment module, storage has transducer calibration parameter, can directly calculate and show tested electric field magnitude and phase place.
Described electric-field sensor also includes wireless radio frequency modules, and the input of described wireless radio frequency modules is connected with described micro treatment module, for the amplitude of total electric field under described HVDC transmission line and phase place are sent to host computer in real time and are displayed.
Described measured signal input channel includes the amplifier, wave filter and the AD sampler that are sequentially connected with, and described amplifier exports to described wave filter after amplifying faradic current m (t); After described faradic current is filtered by described wave filter, output is to an AD sampler; After the described AD sampler faradic current to receiving carries out AD sampling, output discrete series m (k) is to described micro treatment module.
Described reference signal input channel includes the 2nd AD sampler, and described 2nd AD sampler exports synchronous reference signal sequence s (k) to described micro treatment module after described reference signal r (t) carries out AD sampling; The described 2nd AD sampler integral multiple that hits is 4 within each cycle. Reference signal frequency changes with measured signal frequency, it is possible to ensure that two signals are with frequency. Meanwhile, phase contrast between the two is also fixing.
As shown in Figure 3: described electric field induction system includes motor and the photoelectric code disk, induction blade and the shielding blade that are sequentially arranged on described motor axle;
Described shielding blade is followed described motor shaft and is done cycle rotation, and the electric field in fixed described induction blade carries out periodically shielding; Described induction blade produces faradic current m (t) of frequency and amplitude stability, is transferred to described measured signal input channel.
Reference signal produces the photoswitch that system includes installing on described photoelectric code disk and the shaping circuit connecting described photoswitch outfan, and described shaping circuit is connected with described reference signal input channel;
Described photoelectric code disk is followed described motor shaft and is rotated; Described photoswitch produces pulse signal, by the velocity of rotation of photoelectric code disk described in pulse signal detection, and produces standard block signal r (t) as reference signal transmission to described reference signal input channel by described shaping circuit.
Described motor connects with the circuit for controlling motor being connected with electric power system; Described electric power system output 3.3V regulated power supply powers to described circuit for controlling motor, and the voltage stabilizing chip upc1470 of described circuit for controlling motor controls described motor speed.
As shown in Figure 4: described micro treatment module includes phase shifter, the first phase-sensitive detector, the second phase-sensitive detector, the first low pass filter, the second low pass filter, electric field magnitude computing module and direction of an electric field computing module; The outfan of described reference signal input channel connects the input of described phase shifter and the input of described first phase-sensitive detector respectively; The outfan of described measured signal input channel connects another input of described first phase-sensitive detector and the input of described second phase-sensitive detector respectively; The outfan of described phase shifter connects another input of described second phase-sensitive detector; The outfan of described first phase-sensitive detector connects the input of described first low pass filter; The outfan of described second phase-sensitive detector connects the input of described second low pass filter; The outfan of described first low pass filter and the outfan of described second low pass filter connect the input of described electric field magnitude computing module and the input of described direction of an electric field computing module respectively.
The mobile 90 degree of phase angles of synchronous reference signal sequence s (k) that described reference signal input channel is exported by the described phase shifter, export to described second phase-sensitive detector after forming orthogonal reference sequence c (k);
Discrete series m (k) and described synchronous reference signal sequence s (k) are done multiplying by described first phase-sensitive detector, obtain at discrete digital signal I (k) of time domain and export to described first low pass filter, I (k)=m (k) * s (k);
Discrete series m (k) and described orthogonal reference sequence c (k) are done multiplying by described second phase-sensitive detector, obtain at discrete digital signal Q (k) of time domain and export to described second low pass filter, Q (k)=m (k) * c (k);
The DC component X (k) remained is exported to described electric field magnitude computing module and described direction of an electric field computing module after filtering the higher hamonic wave interference in digital signal I (k) by described first low pass filter respectively;
The DC component Y (k) remained is exported to described electric field magnitude computing module and described direction of an electric field computing module after filtering the higher hamonic wave interference in digital signal Q (k) by described second low pass filter respectively;
Described electric field magnitude computing module equation below (1) calculates the amplitude of total electric field under HVDC transmission line
E ‾ = X ( k ) 2 + Y ( k ) 2 / V r - - - ( 1 )
Wherein VrThe amplitude of square-wave signal produced by reference signal generation system;
Described direction of an electric field computing module equation below (2) calculates the phase of total electric field under HVDC transmission line:
φ = arctan ( Y ( k ) X ( k ) ) - - - ( 2 )
Described first low pass filter and described second low pass filter are the low pass filter based on arithmetic equal value; Interlock circuit designed by the present invention makes to examine the amplitude V of square-wave signal produced by signal generator moduler=1, electric field magnitude calculates and can be further simplified as: E ‾ = X ( k ) 2 + Y ( k ) 2
The present invention uses an AD sampler that faradic current m (t) is carried out A/D sampling, obtains discrete series m (k), if the sample frequency of an AD sampler is fs, sampling number is Ns, then discrete series m (k) can be expressed as:
m ( k ) = V m s i n ( 2 πf 0 k f s + θ ) , 0≤k≤Ns-1
Wherein, faradic current m (t) is sinusoidal signal, VmFor the amplitude of faradic current m (t), θ is the initial phase of faradic current m (t); K is integer, f0Frequency for faradic current m (t).
When utilizing square-wave signal as reference, simpler on algorithm, it is possible to replace the multiplying of multiplier with additive operation, the hardware resource consumption of calculating is little, system real time is better, particularly to the microprocessor that hardware resource is limited. Therefore, select square-wave signal as reference signal.
Square wave reference signal is carried out binary conversion treatment, becomes the square-wave signal that amplitude is 1, it is possible to simplify computation complexity, and not by the impact of square wave reference signal amplitude fluctuations. Actual reference signal is produced by photoelectric code disk, triggers circuit by Schmitt, is shaped as standard block signal. Through A/D gather laggard enter micro treatment module, as road synchronous reference signal sequence S (k). Meanwhile, by mobile for sequence S (k) N/4 point, namely mobile 90 degree of phase angles, form orthogonal reference sequence C (k). The integral multiple that hits N is 4 in order to make the accurate of phase shift angle, in each cycle.
Reference Signal high level sampled value is set to 1, and low level sampled value is set to-1. Within a cycle, synchronous reference signal and orthogonal reference signal sequence can be expressed as:
S ( k ) = 1 0 ≤ k ≤ N 2 - 1 - 1 N 2 ≤ k ≤ N - 1
C ( k ) = 1 0 ≤ k ≤ N 4 - 1 , 3 N 4 ≤ k ≤ N - 1 - 1 N 4 ≤ k ≤ 3 N 4 - 1
Owing to reference signal can be considered as switching signal, thus the multiplying in phase-sensitive detector can be reduced to additive operation and subtraction.
I ( k ) = m ( k ) × S ( k ) = Σ k = 0 N / 4 - 1 m ( k ) + Σ k = N / 4 N / 2 - 1 m ( k ) - Σ k = N / 2 3 N / 2 - 1 m ( k ) - Σ k = 3 N / 2 N - 1 m ( k )
Q ( k ) = m ( k ) × C ( k ) = Σ k = 0 N / 4 - 1 m ( k ) - Σ k = N / 4 N / 2 - 1 m ( k ) - Σ k = N / 2 3 N / 2 - 1 m ( k ) + Σ k = 3 N / 2 N - 1 m ( k )
The calculating of I (k) He Q (k) can be regarded as the addition in above formula 4 different pieces and subtraction, be partially shown as A, B, C, D by these 4 respectively, then can obtain:
I (k)=A+B-C-D
Q (k)=A-B-C+D
Thus, the amount of calculation of I (k) and Q (k) can further be reduced, and namely calculates A, B, C, D respectively, then calculates I (k) and Q (k) according to above formula.
Compared to the single-frequency of sinusoidal reference signal, the shortcoming of square wave reference signal is that the introducing of harmonic wave can bring certain impact to measurement result containing relatively multiple-harmonic. After low pass filter, the amplitude-frequency response of signal such as schematic diagram 5. For eliminating the higher hamonic wave interference of coupling in measured signal, need to, after signal enters phase-sensitive detector, be ω by low pass filter or mid frequency0Narrow-band pass filter filters higher hamonic wave.
In the design of wave digital lowpass filter, arithmetic equal value filtering dialogue noise suppressed is optimum IIR filtering under least square meaning, and arithmetic equal value filtering simultaneously realizes simple, and the real-time of algorithm is higher. Therefore the first low pass filter in the present invention and the second low pass filter all adopt arithmetic equal value wave filter.
Finally should be noted that: above example is only in order to illustrate that technical scheme is not intended to limit; although the present invention being described in detail with reference to above-described embodiment; the specific embodiment of the present invention still can be modified or equivalent replacement by those of ordinary skill in the field; these are without departing from any amendment of spirit and scope of the invention or equivalent replace, all within the claims that application is awaited the reply.

Claims (10)

1. a digital electric field sensor, it is characterised in that described electric-field sensor includes electric field induction system, reference signal produces system, measured signal input channel, reference signal input channel and micro treatment module; Wherein:
Electric field induction system, its outfan is connected with measured signal input channel, for measuring the total electric field under HVDC transmission line, and it is transferred to described measured signal input channel after described total electric field is converted into faradic current m (t) of frequency and amplitude stability;
Reference signal produces system, its outfan is connected with reference signal input channel, for producing with described faradic current m (t) with the square-wave signal of frequency homophase as reference signal r (t), and described reference signal r (t) is transferred to reference signal input channel;
Measured signal input channel, its outfan is connected with micro treatment module, for described faradic current m (t) being amplified, filter and after AD sampling, exports discrete series m (k) to described micro treatment module;
Reference signal input channel, its outfan is connected with micro treatment module, and after described reference signal r (t) is carried out AD sampling, output synchronous reference signal sequence s (k) is to described micro treatment module;
Micro treatment module, after discrete series m (k) and synchronous reference signal sequence s (k) being carried out phase sensitive detection with two phase-sensitive detectors, calculates amplitude and the phase place of total electric field under HVDC transmission line.
2. a kind of digital electric field sensor according to claim 1, it is characterised in that:
Described electric-field sensor also includes wireless radio frequency modules, and the input of described wireless radio frequency modules is connected with described micro treatment module, for the amplitude of total electric field under described HVDC transmission line and phase place are sent to host computer in real time and are displayed.
3. a kind of digital electric field sensor according to claim 1, it is characterised in that:
Described electric field induction system includes motor and the photoelectric code disk, induction blade and the shielding blade that are sequentially arranged on described motor axle;
Described shielding blade is followed described motor shaft and is done cycle rotation, and the electric field in fixed described induction blade carries out periodically shielding; Described induction blade produces faradic current m (t) of frequency and amplitude stability, is transferred to described measured signal input channel.
4. a kind of digital electric field sensor according to claim 3, it is characterised in that:
Described reference signal produces the photoswitch that system includes installing on described photoelectric code disk and the shaping circuit connecting described photoswitch outfan, and described shaping circuit is connected with described reference signal input channel;
Described photoelectric code disk is followed described motor shaft and is rotated; Described photoswitch produces pulse signal, by the velocity of rotation of photoelectric code disk described in pulse signal detection, and produces standard block signal r (t) as reference signal transmission to described reference signal input channel by described shaping circuit.
5. a kind of digital electric field sensor according to claim 3 or 4, it is characterised in that:
Described motor connects with the circuit for controlling motor being connected with electric power system; Described electric power system output 3.3V regulated power supply powers to described circuit for controlling motor, and the voltage stabilizing chip upc1470 of described circuit for controlling motor controls described motor speed.
6. a kind of digital electric field sensor according to claim 1, it is characterised in that:
Described measured signal input channel includes the amplifier, wave filter and the AD sampler that are sequentially connected with, and described amplifier exports to described wave filter after amplifying faradic current m (t); After described faradic current is filtered by described wave filter, output is to an AD sampler; After the described AD sampler faradic current to receiving carries out AD sampling, output discrete series m (k) is to described micro treatment module.
7. a kind of digital electric field sensor according to claim 1, it is characterised in that:
Described reference signal input channel includes the 2nd AD sampler, and described 2nd AD sampler exports synchronous reference signal sequence s (k) to described micro treatment module after described reference signal r (t) carries out AD sampling; The described 2nd AD sampler integral multiple that hits is 4 within each cycle.
8. a kind of digital electric field sensor according to claim 1, it is characterised in that:
Described micro treatment module includes phase shifter, the first phase-sensitive detector, the second phase-sensitive detector, the first low pass filter, the second low pass filter, electric field magnitude computing module and direction of an electric field computing module; The outfan of described reference signal input channel connects the input of described phase shifter and the input of described first phase-sensitive detector respectively; The outfan of described measured signal input channel connects another input of described first phase-sensitive detector and the input of described second phase-sensitive detector respectively; The outfan of described phase shifter connects another input of described second phase-sensitive detector; The outfan of described first phase-sensitive detector connects the input of described first low pass filter; The outfan of described second phase-sensitive detector connects the input of described second low pass filter; The outfan of described first low pass filter and the outfan of described second low pass filter connect the input of described electric field magnitude computing module and the input of described direction of an electric field computing module respectively.
9. a kind of digital electric field sensor according to claim 8, it is characterised in that:
The mobile 90 degree of phase angles of synchronous reference signal sequence s (k) that described reference signal input channel is exported by the described phase shifter, export to described second phase-sensitive detector after forming orthogonal reference sequence c (k);
Discrete series m (k) and described synchronous reference signal sequence s (k) are done multiplying by described first phase-sensitive detector, obtain at discrete digital signal I (k) of time domain and export to described first low pass filter, I (k)=m (k) * s (k);
Discrete series m (k) and described orthogonal reference sequence c (k) are done multiplying by described second phase-sensitive detector, obtain at discrete digital signal Q (k) of time domain and export to described second low pass filter, Q (k)=m (k) * c (k);
The DC component X (k) remained is exported to described electric field magnitude computing module and described direction of an electric field computing module after filtering the higher hamonic wave interference in digital signal I (k) by described first low pass filter respectively;
The DC component Y (k) remained is exported to described electric field magnitude computing module and described direction of an electric field computing module after filtering the higher hamonic wave interference in digital signal Q (k) by described second low pass filter respectively;
Described electric field magnitude computing module equation below (1) calculates the amplitude of total electric field under HVDC transmission line
E ‾ = X ( k ) 2 + Y ( k ) 2 / V r - - - ( 1 )
Wherein VrThe amplitude of square-wave signal produced by reference signal generation system;
Described direction of an electric field computing module equation below (2) calculates the phase of total electric field under HVDC transmission line:
φ = a r c t a n ( Y ( k ) X ( k ) ) - - - ( 2 )
10. a kind of digital electric field sensor according to claim 9, it is characterised in that:
Described first low pass filter and described second low pass filter are the low pass filter based on arithmetic equal value, described Vr=1.
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108008323A (en) * 2017-11-20 2018-05-08 哈尔滨工业大学 A kind of magnetic signal measuring device and method based on low-pass filtering
CN108627708A (en) * 2017-03-22 2018-10-09 中国电力科学研究院 The implementation method of based on WLAN impact electric field measurement system
CN108693486A (en) * 2018-03-30 2018-10-23 华中科技大学 A kind of faint low frequency magnetic signal detection method and system based on AMR sensor
CN109521266A (en) * 2019-01-25 2019-03-26 南京文道自动化系统有限公司 ± 800KV extra-high voltage direct-current non-contact intelligent electroscope
CN109655769A (en) * 2019-01-22 2019-04-19 中国人民解放军国防科技大学 A kind of GMI sensor based on double detection amplification principles
CN110096963A (en) * 2019-04-08 2019-08-06 清华大学深圳研究生院 A kind of useful signal extraction circuit, method and device
CN110581355A (en) * 2019-09-05 2019-12-17 北京航空航天大学 Flexible mechanical antenna communication system based on electret

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RO84490A2 (en) * 1983-01-12 1984-06-21 Institutul Politehnic,Ro EQUIPMENT FOR MEASURING ELECTROSTATIC CAMP
CN2281541Y (en) * 1996-12-24 1998-05-13 中国科学院兰州高原大气物理研究所 Downward electric field instrument
CN1601286A (en) * 2003-09-26 2005-03-30 中国科学院空间科学与应用研究中心 Constant speed rotary flip-chip electric field gage suitable for thunderstom electricity and near ground atmosphere electric enviroment detection
CN101576590A (en) * 2009-04-03 2009-11-11 中国人民解放军理工大学 Miniature electric field measuring apparatus
CN202041589U (en) * 2011-04-20 2011-11-16 南京信息工程大学 Vibration shielded electric field sensor
CN104181402A (en) * 2014-08-18 2014-12-03 国家电网公司 Direct-current electric field detecting device used under condition of hybrid electric field
CN204479659U (en) * 2015-03-17 2015-07-15 江苏省无线电科学研究所有限公司 Low-power consumption integral type atmospheric electric field sensor
CN105116236A (en) * 2015-09-06 2015-12-02 江苏省无线电科学研究所有限公司 High-sensitivity differential rotating electric field instrument for multi-field application

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RO84490A2 (en) * 1983-01-12 1984-06-21 Institutul Politehnic,Ro EQUIPMENT FOR MEASURING ELECTROSTATIC CAMP
CN2281541Y (en) * 1996-12-24 1998-05-13 中国科学院兰州高原大气物理研究所 Downward electric field instrument
CN1601286A (en) * 2003-09-26 2005-03-30 中国科学院空间科学与应用研究中心 Constant speed rotary flip-chip electric field gage suitable for thunderstom electricity and near ground atmosphere electric enviroment detection
CN101576590A (en) * 2009-04-03 2009-11-11 中国人民解放军理工大学 Miniature electric field measuring apparatus
CN202041589U (en) * 2011-04-20 2011-11-16 南京信息工程大学 Vibration shielded electric field sensor
CN104181402A (en) * 2014-08-18 2014-12-03 国家电网公司 Direct-current electric field detecting device used under condition of hybrid electric field
CN204479659U (en) * 2015-03-17 2015-07-15 江苏省无线电科学研究所有限公司 Low-power consumption integral type atmospheric electric field sensor
CN105116236A (en) * 2015-09-06 2015-12-02 江苏省无线电科学研究所有限公司 High-sensitivity differential rotating electric field instrument for multi-field application

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
伍小成 等: "提高旋转式电场仪测量电场特性的方法研究", 《计测技术》 *
唐海 等: "大气电场仪中相敏检波器的分析与设计", 《现代电子技术》 *
张洪钏 等: "交直流混合电场旋转式一体化测试仪的研制", 《电网技术》 *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108627708A (en) * 2017-03-22 2018-10-09 中国电力科学研究院 The implementation method of based on WLAN impact electric field measurement system
CN108008323A (en) * 2017-11-20 2018-05-08 哈尔滨工业大学 A kind of magnetic signal measuring device and method based on low-pass filtering
CN108693486A (en) * 2018-03-30 2018-10-23 华中科技大学 A kind of faint low frequency magnetic signal detection method and system based on AMR sensor
CN109655769A (en) * 2019-01-22 2019-04-19 中国人民解放军国防科技大学 A kind of GMI sensor based on double detection amplification principles
CN109521266A (en) * 2019-01-25 2019-03-26 南京文道自动化系统有限公司 ± 800KV extra-high voltage direct-current non-contact intelligent electroscope
CN110096963A (en) * 2019-04-08 2019-08-06 清华大学深圳研究生院 A kind of useful signal extraction circuit, method and device
CN110096963B (en) * 2019-04-08 2021-06-22 清华大学深圳研究生院 Useful signal extraction circuit, method and device
CN110581355A (en) * 2019-09-05 2019-12-17 北京航空航天大学 Flexible mechanical antenna communication system based on electret

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