CN100446047C - The circuit device of the power grid harmonious radio detector and its working method - Google Patents
The circuit device of the power grid harmonious radio detector and its working method Download PDFInfo
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- CN100446047C CN100446047C CNB200710019772XA CN200710019772A CN100446047C CN 100446047 C CN100446047 C CN 100446047C CN B200710019772X A CNB200710019772X A CN B200710019772XA CN 200710019772 A CN200710019772 A CN 200710019772A CN 100446047 C CN100446047 C CN 100446047C
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Abstract
This invention relates to one electricity resonance wave wireless tester circuit device and its work method, wherein, the device comprises wireless send device to collect electricity voltage signals and wireless receive device to display the resonance content; in wireless send device, electrode is near high voltage conductive wires to collect the voltage in contact or non-contact types; signal collection process is to couple field voltage to test voltage; CPU unit analyzes the each wave content according to the test voltages; send module is to modulate the content information to be sent from electrode; wireless receive device is to receive and display each wave content.
Description
Technical field
The present invention relates to the circuit arrangement and the method for work thereof in high pressure detection technique field, particularly a kind of power grid harmonious radio detector.
Background technology
Development along with Power Electronic Technique, the harmonic problem that power electronic equipment brings is to power system security, stable, economical operation formation potential threat, electric circumstance has brought the very big big public hazards that harmonic wave is considered to electrical network that influence around giving, also hindered simultaneously the development of Power Electronic Technique, therefore, the research of Harmonious Waves in Power Systems problem is paid attention to gradually by people.
Harmonic wave harm can be summed up as: 1) consume idle and increase line loss; 2) cause apparatus overload, reduce apparatus insulated grade, quicken insulation ag(e)ing even cause fire etc.; 3) reduce loaded work piece performance (as making motor produce additional moment etc.); 4) influence the accuracy of measuring, influence device reliability services such as relay protection; 5) communication system and computer network are produced electromagnetic interference (EMI) etc.; 6) cause system's instability, the harm electric power netting safe running.
Harmonious Waves in Power Systems is meant that periodicity non-sinusoidal electric weight is carried out fourier series to be decomposed, and except obtaining the component identical with the electrical network fundamental frequency, also obtains a series of components greater than the electrical network fundamental frequency, and this part electric weight is called harmonic wave.
The each harmonic content that the common employing of harmonic wave detection detects the voltage of substation PT line end on the high-voltage fence circuit reflects the harmonic wave situation on the circuit indirectly at present, because line load situation complexity, the harmonic wave situation of high-tension line and substation PT line end is incomplete same, the harmonic wave situation of the harmonic wave situation that adopts the substation PT line end on like this can not the actual response high-tension line is for harmonic content the best way of accurately measuring on the high-voltage fence circuit is direct measurement.
Chinese patent application 89105302.6 discloses a kind of " power system harmonizing wave measuring method and measuring instrument ", Chinese patent application 92106527.2 discloses a kind of " with the electric harmonic measuring method of robot calculator ", Chinese patent application 98110414.2 discloses a kind of " harmonic quantitative measurement method of power system and measuring instrument ", Chinese patent application 200310105446.2 discloses a kind of " method of measuring factory harmonic wave and measuring instrument ", these measurement mechanisms all are to adopt wired mode to carry out Harmonic Detection, detection for high-voltage fence, can't directly obtain the high-voltage fence voltage signal, above-mentioned prior art should not adopt.
Summary of the invention
Technical matters to be solved by this invention provides a kind of circuit arrangement and method of work thereof that directly obtains the harmonic signal and the safe and reliable power grid harmonious radio detector of high-voltage fence voltage by standard-field strength method.
For solving the problems of the technologies described above, the circuit arrangement of power grid harmonious radio detector of the present invention comprises the wireless base station apparatus and the radio receiver that is used to show the line voltage harmonic content of surveying that are used for gathering by standard-field strength method mains voltage signal; Wireless base station apparatus comprises: electrode, signal acquisition processing circuit, first CPU element and sending module; Electrode links to each other with the high-voltage fence voltage signal input end of signal acquisition processing circuit; The detectable voltage signals input end of mains voltage signal output termination first CPU element of signal acquisition processing circuit; The voltage harmonic signal output part of first CPU element receives and sends the modulation signal input end of module; The modulation signal output terminal of sending module links to each other with described electrode; Wireless base station apparatus is hung on the tested lead of high pressure by electrode or is mutually close with the tested lead of high pressure, to gather high-voltage fence voltage by standard-field strength method; Signal acquisition processing circuit is used for described high-voltage fence voltage is coupled into detection voltage by standard-field strength method; First CPU element can go out the content of each harmonic in the line voltage according to described detection voltage analysis; Sending module sends wireless signal by electrode with the content information of described each harmonic after modulating; Radio receiver comprises: receiving antenna, radio receiver, second CPU element and display module; Receiving antenna links to each other with the signal input part of radio receiver, the voltage harmonic signal input part of demodulation output termination second CPU element of radio receiver; The video output terminals of second CPU element connects display module; Radio receiver receive by receiving antenna and demodulation from the wireless signal of wireless base station apparatus, obtaining the content information of described each harmonic, after send into second CPU element, show the content of the each harmonic in the line voltage of surveying at last by display module.
In the technique scheme, wireless base station apparatus also comprises: driving circuit and sound and light signal generation circuit; The sound and light signal control output end of first CPU element connects the drive controlling input end of driving circuit, the signal input end of the drive controlling output termination sound and light signal generation circuit of driving circuit; Whether first CPU element is working properly with the prompting wireless base station apparatus by driving sound and light signal generation circuit.
In the technique scheme, wireless base station apparatus also comprises: the frequency adjustable square-wave generator with the simulation mains voltage signal input end of first CPU element links to each other is used to produce power frequency reference square wave signal, with in equipment self-inspection time simulation mains voltage signal.
In the technique scheme, signal acquisition processing circuit comprises: telefault and sampling bleeder circuit; Electrode and telefault are in series, and sampling bleeder circuit and telefault are in parallel, and are used for when detection the coupled voltages at the telefault two ends dividing potential drop of sampling, to obtain described detection voltage and to send into the detectable voltage signals input end of first CPU element; Or signal acquisition processing circuit comprises: resistance and sampling bleeder circuit; Electrode is resistance in series and sampling bleeder circuit successively, and the sampling bleeder circuit is to the coupled voltages of the resistance dividing potential drop of sampling, to obtain described detection voltage and to send into the detectable voltage signals input end of first CPU element when detecting.
The method of work of the circuit arrangement of above-mentioned power grid harmonious radio detector comprises the steps:
A, wireless base station apparatus are hung on the tested high-voltage conducting wires by electrode or are mutually close with the tested lead of high pressure;
B, signal acquisition processing circuit are coupled into detection voltage with the high-voltage fence voltage signal of electrode collection by standard-field strength method, and send into the detectable voltage signals input end of first CPU element;
C, first CPU element can go out the information of each harmonic content in the line voltage according to described detection voltage analysis, after send into the modulation signal input end of sending module;
D, sending module send wireless signal by electrode with the content information of described each harmonic after modulating;
In E, the radio receiver, radio receiver receives also demodulation from the wireless signal of wireless base station apparatus by receiving antenna, and obtains the content information of described each harmonic;
F, second CPU element obtain the content information of described each harmonic, and show the content of the each harmonic in the line voltage of surveying by display module.
In the technique scheme, in above-mentioned steps C, when first CPU element according to described detection voltage analysis line voltage in during the information of each harmonic content, a plurality of complete cycle of the waveform and these shape informations being deposited in the memory buffer of first CPU element of the described detection voltage of first CPU element elder generation's continuous acquisition; An every collection waveform complete cycle, first CPU element just checks once whether its memory buffer is full, when this buffer zone is full, begin to adopt fast fourier transform that a plurality of complete cycle of the waveform of described collection is analyzed, and draw the content of each harmonic in this line voltage.
In the technique scheme, the sound and light signal control output end output services status signal of first CPU element, guide sound light signal generation circuit behind driving circuit, whether working properly with the prompting wireless base station apparatus.
In the technique scheme, before above-mentioned steps A-F, the frequency adjustable square-wave generator produces power frequency reference square wave signal and sends into the simulation mains voltage signal input end of first CPU element, carries out equipment self-inspection with the simulation mains voltage signal; If sound and light signal generation circuit sends sound and light signal, then self check success, wireless base station apparatus can be working properly; Otherwise, fail self-test then, wireless base station apparatus can not be working properly.
In the technique scheme, described high-voltage fence voltage signal with the electrode collection is coupled into the detection voltage method by standard-field strength method, comprising: magnetic field coupled method and field coupled method.
The present invention has positive effect: (1) the present invention is divided into two parts with the Harmonic Detection device, be wireless base station apparatus and radio receiver, during detection, earlier wireless base station apparatus is hung on the high-voltage conducting wires by electrode or mutually close, just can detects with tested high-voltage conducting wires; Wireless base station apparatus is gathered mains voltage signal analyzing the content of each harmonic in the line voltage by electrode, after the content information modulation back of this each harmonic is sent with wireless signal by electrode; Radio receiver receives this wireless signal, after demodulation, promptly obtains the content information of described each harmonic, shows by display module at last.Harmonic Detection device of the present invention can wireless mode directly obtains the harmonic signal of high-voltage fence voltage in testing process, thus safe, good reliability.(2) among the present invention, be provided with the frequency adjustable square-wave generator in the wireless base station apparatus, be used to produce power frequency reference square wave signal, with simulated high-pressure mains voltage signal when the equipment self-inspection, can operate as normal with this wireless base station apparatus of timely judgement, whether normal as checking wireless telecommunications, further improved security of the present invention and reliability.(3) among the present invention, adopt sound and light signal generation circuit in the wireless base station apparatus,, further improved reliability of the present invention in testing process, to judge whether operate as normal of this wireless base station apparatus.(4) among the present invention, signal acquisition processing circuit adopts magnetic field coupled method and field coupled method, and simple in structure, with low cost, the detection voltage of gathering is undistorted.(5) power grid harmonious radio detector of the present invention in use, hand-holdable radio receiver is observed testing result, safety easy to use.When (6) measuring, electrode contacts or does not contact with tested high-voltage conducting wires, is convenient to operation, safe ready; Spacing when electrode does not contact with tested high-voltage conducting wires is 1-20cm, and the spacing size is relevant with the grade of tested line voltage, and voltage is high more, and spacing can be big more.(7) the present invention can also be applied on the high voltage display device and the lightning arrester device for detecting performance based on standard-field strength method based on standard-field strength method.
Description of drawings
General illustration when Fig. 1 detects for the power grid harmonious radio detector of inventing is used for the high-voltage fence harmonic wave;
Fig. 2 is the circuit block diagram of the wireless base station apparatus in the power grid harmonious radio detector of the present invention;
Fig. 3 is the circuit block diagram of the radio receiver in the power grid harmonious radio detector of the present invention;
General illustration when Fig. 4 detects for power grid harmonious radio detector of the present invention is used for the low voltage electric network harmonic wave;
Fig. 5 and Fig. 6 are two kinds of circuit theory diagrams of the signal acquisition processing circuit in the wireless base station apparatus;
Fig. 7 is the program flow chart of the CPU element in the wireless base station apparatus of the present invention.
Embodiment
(embodiment 1)
See Fig. 1, the circuit arrangement of the power grid harmonious radio detector of present embodiment comprises: be used for standard-field strength method and gather the wireless base station apparatus 1 of mains voltage signal and be used for the hand-held radio receiver 2 that shows the line voltage harmonic content of surveying.
See Fig. 2, wireless base station apparatus 1 comprises: electrode 1-1, signal acquisition processing circuit 1-2, the first CPU element 1-3 and sending module 1-4, driving circuit 1-5, sound and light signal generation circuit 1-6 and frequency adjustable square-wave generator 1-7.
Electrode 1-1 is a metallic conductor, and this metallic conductor appearance can the wrap insulate layer.The high-voltage fence voltage signal input end of electrode 1-1 and signal acquisition processing circuit 1-2 is electrically connected; The detectable voltage signals input end of the mains voltage signal output termination first CPU element 1-3 of signal acquisition processing circuit 1-2; The voltage harmonic signal output part of the first CPU element 1-3 receives and sends the modulation signal input end of module 1-4; The modulation signal output terminal of sending module 1-4 and described electrode 1-1 are electrically connected.
The power frequency component output terminal of frequency adjustable square-wave generator 1-7 links to each other with the simulation mains voltage signal input end of the first CPU element 1-3, is used to produce power frequency reference square wave signal, with in equipment self-inspection time simulation mains voltage signal.Have only when the self check success, just can carry out the detection of high-voltage fence line harmonic.
The sound and light signal control output end of the first CPU element 1-3 connects the drive controlling input end of driving circuit 1-5, the signal input end of the drive controlling output termination sound and light signal generation circuit 1-6 of driving circuit 1-5; Whether the first CPU element 1-3 is working properly by driving sound and light signal generation circuit 1-6 prompting wireless base station apparatus 1.When wireless base station apparatus 1 operate as normal, sound and light signal generation circuit 1-6 generates third contact of a total solar or lunar eclipse signal; Otherwise no third contact of a total solar or lunar eclipse signal generates.
See Fig. 3, radio receiver 2 comprises: receiving antenna 2-1, radio receiver 2-2, the second CPU element 2-3 and display module 2-4.Receiving antenna 2-1 links to each other with the signal input part of radio receiver 2-2, the voltage harmonic signal input part of the demodulation output termination second CPU element 2-3 of radio receiver 2-2; The video output terminals of the second CPU element 2-3 meets display module 2-4, to show each harmonic content in the line voltage; Radio receiver 2-2 receive by receiving antenna 2-1 and demodulation from the wireless signal of wireless base station apparatus 1, obtaining the content information of described each harmonic, after send into the second CPU element 2-3; The second CPU element 2-3 shows the content of the each harmonic in the line voltage of surveying by display module 2-4.
Still see Fig. 1, the bend that the top of the electrode 1-1 on the wireless base station apparatus 1 can be made for all insulation material also can be conductor, hang on tested high-voltage conducting wires (or mutually close) by insulating bar 3 during use, to gather high-voltage fence voltage.The electrode 1-1 while is as the antenna of the emission wireless signal of wireless base station apparatus 1.Described high-voltage fence voltage range is at 0.6KV one 500KV.
Described standard-field strength method comprises magnetic field coupled method and field coupled method.
When wireless base station apparatus 1 adopted magnetic field coupled method detection of grid voltage, as Fig. 5, signal acquisition processing circuit 1-2 comprised: telefault L1 and the sampling bleeder circuit that is made of resistance R 1, R2; Electrode 1-1 and telefault L1 are in series, and sampling bleeder circuit and telefault L1 are in parallel, and the bleeder circuit of sampling is used for to the coupled voltages at the telefault L1 two ends dividing potential drop of sampling, to obtain described detection voltage V1.During detection, the electromagnetic signal around the high-voltage conducting wires of surveying on telefault L1, induce electromotive force, this electromotive force draws described detection voltage V1 after sampling bleeder circuit dividing potential drop, and sends into the detectable voltage signals input end of the first CPU element 1-3.
When wireless base station apparatus 1 adopted field coupled method detection of grid voltage, as Fig. 6, signal acquisition processing circuit 1-2 comprised: resistance R 3 and sampling bleeder circuit are resistance R 4; Electrode 1-1 is resistance in series R3 and R4 successively, and resistance R 4 is used for the coupled voltages of resistance R 3 dividing potential drop of sampling is obtained described detection voltage V1 with the contact place at resistance R 3 and R4.During detection, the electric field signal around the high-voltage conducting wires of surveying on electrode 1-1, induce electric charge, be transformed into electric current after resistance R 3 changes voltage signal into, be to draw described detection voltage V1 after resistance R 4 dividing potential drops by the sampling bleeder circuit, and send into the detectable voltage signals input end of the first CPU element 1-3.
When the described mains voltage signal of first CPU element 1-3 acquisition is the waveform of a complete cycle, the first CPU element 1-3 checks whether its buffer zone is full, when this buffer zone is full, can adopt fast fourier transform (FFT conversion) that described mains voltage signal is analyzed, and draw the content of each harmonic in this line voltage; The voltage harmonic signal output part of the last first CPU element 1-3 is exported the content information of this each harmonic, is sent by electrode 1-1 is wireless by sending module 1-4 modulation back.Hand-holdable radio receiver 2 can receive from the wireless signal of wireless base station apparatus 1 and by display module 2-4 and show the harmonic wave in the line voltage of surveying.
Described harmonic measure based on Fourier transform is that current the application at most also is the most a kind of method, and precision is higher, easy to use.The first CPU element 1-3 can adopt embedded system ARM, digital signal processor DSP, on-site programmable gate array FPGA and single-chip microcomputer etc.The frequency of described wireless signal is at 200-900MHz, and modulation system can adopt ASK, PSK or FSK etc.
The method of work of the circuit arrangement of above-mentioned power grid harmonious radio detector comprises the steps:
A, wireless base station apparatus 1 are hung on the tested high-voltage conducting wires by electrode 1-1;
B, signal acquisition processing circuit 1-2 are coupled into detection voltage with the high-voltage fence voltage signal that electrode 1-1 gathers by standard-field strength method, and send into the detectable voltage signals input end of the first CPU element 1-3;
C, the first CPU element 1-3 go out the information of each harmonic content in the line voltage according to described detection voltage analysis, after send into the modulation signal input end of sending module 1-4; Wherein, see Fig. 7, when the first CPU element 1-3 according to described detection voltage analysis line voltage in during the information of each harmonic content, a plurality of (present embodiment is 15, can be 6 to 30 among other embodiment) waveform complete cycle of the described detection voltage of first CPU element 1-3 elder generation's continuous acquisition also deposits these shape informations in the memory buffer of the first CPU element 1-3; An every collection waveform complete cycle, the first CPU element 1-3 just checks once whether its memory buffer is full, when this buffer zone is full, begin to adopt fast fourier transform that a plurality of complete cycle of the waveform of described collection is analyzed, and draw the content of each harmonic in this line voltage.The capacity of the memory buffer of the first CPU element 1-3 is big more, and collectable described complete cycle, waveform was just many more, and measurement result is just reliable more.
D, sending module 1-4 send wireless signal by electrode 1-1 with the content information of described each harmonic after modulating;
In E, the radio receiver 2, radio receiver 2-2 receives also demodulation from the wireless signal of wireless base station apparatus 1 by receiving antenna 2-1, and obtains the content information of described each harmonic;
F, the second CPU element 2-3 obtain the content information of described each harmonic, and show the content of the each harmonic in the line voltage of surveying by display module 2-4.
The sound and light signal control output end output services status signal of the first CPU element 1-3, guide sound light signal generation circuit 1-6 behind driving circuit 1-5, whether working properly with prompting wireless base station apparatus 1.
Before above-mentioned steps A-F, frequency adjustable square-wave generator 1-7 produces power frequency reference square wave signal and sends into the simulation mains voltage signal input end of the first CPU element 1-3, carries out equipment self-inspection with the simulation mains voltage signal; If sound and light signal generation circuit 1-6 sends sound and light signal, then self check success, wireless base station apparatus 1 can be working properly; Otherwise, fail self-test then, wireless base station apparatus 1 can not be working properly.
The principle of work of described magnetic field coupled method detection of grid voltage is as follows:
The electric current that changes when high-voltage fence is greatly the time, field intensity is also very high on every side, during power grid harmonious radio detector work, the electrode 1-1 of wireless base station apparatus 1 is contacted (or approaching) with the high pressure uniline, then just can be coupled out the power frequency electromagnetic signal with respective phase relation according to Theory of Electromagnetic Field on electrode 1-1, this electromagnetic signal can induce respective electrical kinetic potential ε again on telefault
i
When the distance of the high-voltage electric power circuit of electrode 1-1 was A, the magnetic induction density that calculates electrode present position this moment according to " Biot-Savart law " was:
Know electromotive force ε again according to the law of electromagnetic induction
iSize with pass the rate of change of the magnetic flux of telefault
Be directly proportional promptly
"-" number determined induction electromotive force ε in the formula
iDirection because:
Wherein N is the number of turn of series inductance coil, μ
0Be permeability of vacuum, r
1Be the radius of telefault, i is the power current signal of hi-line
So draw:
As seen ε
iSize and each parameter (r of high-voltage electric power circuit current i, telefault
1, N), device is relevant apart from the distance A of high-voltage electric power circuit etc.; ε
iThe phase place phase difference of pi of phase place and original line current i.
This electromotive force ε
iAfter sampling bleeder circuit dividing potential drop, promptly draw described mains voltage signal, this method is applicable to the situation of big electric current.
The principle of work of described field coupled method detection of grid voltage is as follows:
According to electric field theory, under the transmission line of electricity energising situation around it power frequency electric field change frequency very low, belong to the quasi-static field category.Conductor can produce induced charge under the effect of alternating electric field, at the electric charge that the conductor internal induction goes out, the induction current that can form.
According to
Then the expression formula of electric charge is:
The quantity of electric charge of q wherein for changing, ε is a permittivity of vacuum, and S is the capacitor plate area--and the area of conductor, d are distance-hi-line between two capacitor plates and the distance between the conductor, and u is the power-frequency voltage signal of high-voltage power line
As seen the size of q is relevant apart from d etc. with voltage u, wire glass S, the conductor spacing high-voltage electric power circuit of high-voltage electric power circuit.After upward the induced charge of generation is transformed into current signal with motor 1-1, convert voltage signal to through resistance, after sampling bleeder circuit dividing potential drop, promptly draw described mains voltage signal, this method is applicable to high-tension situation.
Application examples 1
The power grid harmonious radio detector of embodiment 1 detects applicable to the low voltage electric network harmonic wave.
See Fig. 4, the signal acquisition processing circuit 1-2 in the wireless base station apparatus 1 is provided with by lead 1-8 and puts the low voltage electric network voltage signal input end that is connected with the live wire L of low voltage electric network mutually with zero line N, is used to gather low voltage electric network voltage.The voltage range of the low voltage electric network of being surveyed can be between 0-660V.Electrode 1-1 only launches the antenna of wireless signal as wireless base station apparatus 1.
Signal acquisition processing circuit 1-2 after sampling bleeder circuit dividing potential drop, promptly draws low voltage electric network voltage mains voltage signal, and sends into the detectable voltage signals input end of the first CPU element 1-3.
The mains voltage signal that obtains as the first CPU element 1-3 is that a complete cycle is during waveform, the first CPU element 1-3 checks whether its buffer zone is full, when this buffer zone is full, can adopt fast fourier transform (FFT conversion) that described mains voltage signal is analyzed, and draw the content of each harmonic in this line voltage; The voltage harmonic signal output part of the last first CPU element 1-3 is exported the content information of this each harmonic, sends corresponding wireless signal by sending module 1-4 modulation back by electrode 1-1.Hand-holdable radio receiver 2 can receive and show the harmonic wave in the line voltage of surveying.
Claims (10)
1, a kind of circuit arrangement of power grid harmonious radio detector is characterized in that: comprise being used for gathering the wireless base station apparatus (1) of mains voltage signal and being used to show the radio receiver (2) of the Voltage Harmonic content of surveying by standard-field strength method;
Wireless base station apparatus (1) comprising: electrode (1-1), signal acquisition processing circuit (1-2), first CPU element (1-3) and sending module (1-4); Electrode (1-1) links to each other with the high-voltage fence voltage signal input end of signal acquisition processing circuit (1-2); The detectable voltage signals input end of mains voltage signal output termination first CPU element (1-3) of signal acquisition processing circuit (1-2); The voltage harmonic signal output part of first CPU element (1-3) receives and sends the modulation signal input end of module (1-4); The modulation signal output terminal of sending module (1-4) links to each other with described electrode (1-1); Wireless base station apparatus (1) is hung on the tested lead of high pressure by electrode (1-1) or is mutually close with the tested lead of high pressure, to gather high-voltage fence voltage by standard-field strength method; Signal acquisition processing circuit (1-2) is used for described high-voltage fence voltage is coupled into detection voltage by standard-field strength method; First CPU element (1-3) goes out the content of each harmonic in the line voltage according to described detection voltage analysis; Sending module (1-4) sends wireless signal by electrode (1-1) with the content information of described each harmonic after modulating;
Radio receiver (2) comprising: receiving antenna (2-1), radio receiver (2-2), second CPU element (2-3) and display module (2-4); Receiving antenna (2-1) links to each other with the signal input part of radio receiver (2-2), the voltage harmonic signal input part of demodulation output termination second CPU element (2-3) of radio receiver (2-2); The video output terminals of second CPU element (2-3) connects display module (2-4); Radio receiver (2-2) receives also demodulation from the wireless signal of wireless base station apparatus (1) by receiving antenna (2-1), to obtain the content information of described each harmonic, after send into second CPU element (2-3), show the content of the each harmonic in the line voltage of surveying at last by display module (2-4).
2, the circuit arrangement of power grid harmonious radio detector according to claim 1 is characterized in that: wireless base station apparatus (1) also comprises: driving circuit (1-5) and sound and light signal generation circuit (1-6); The sound and light signal control output end of first CPU element (1-3) connects the drive controlling input end of driving circuit (1-5), the signal input end of the drive controlling output termination sound and light signal generation circuit (1-6) of driving circuit (1-5); Whether first CPU element (1-3) is working properly with prompting wireless base station apparatus (1) by driving sound and light signal generation circuit (1-6).
3, the circuit arrangement of power grid harmonious radio detector according to claim 2, it is characterized in that: wireless base station apparatus (1) also comprises: the frequency adjustable square-wave generator (1-7) that links to each other with the simulation mains voltage signal input end of first CPU element (1-3), be used to produce power frequency reference square wave signal, with in equipment self-inspection time simulation mains voltage signal.
4, the circuit arrangement of power grid harmonious radio detector according to claim 1 and 2 is characterized in that: signal acquisition processing circuit (1-2) comprising: telefault and sampling bleeder circuit; Electrode (1-1) is in series with telefault, sampling bleeder circuit and telefault are in parallel, be used for when detecting the coupled voltages at the telefault two ends dividing potential drop of sampling, to obtain described detection voltage and to send into the detectable voltage signals input end of first CPU element (1-3);
5, the circuit arrangement of power grid harmonious radio detector according to claim 1 and 2 is characterized in that: signal acquisition processing circuit (1-2) comprising: resistance and sampling bleeder circuit; Electrode (1-1) is resistance in series and sampling bleeder circuit successively, and the sampling bleeder circuit is to the coupled voltages of the resistance dividing potential drop of sampling, to obtain described detection voltage and to send into the detectable voltage signals input end of first CPU element (1-3) when detecting.
6, the method for work of the circuit arrangement of above-mentioned power grid harmonious radio detector comprises the steps:
A, wireless base station apparatus (1) are by electrode (1-1) contact or near tested high-voltage conducting wires;
The high-voltage fence voltage signal that B, signal acquisition processing circuit (1-2) are gathered electrode (1-1) is coupled into detection voltage by standard-field strength method, and sends into the detectable voltage signals input end of first CPU element (1-3);
C, first CPU element (1-3) go out the information of each harmonic content in the line voltage according to described detection voltage analysis, after send into the modulation signal input end of sending module (1-4);
D, sending module (1-4) send wireless signal by electrode (1-1) with the content information of described each harmonic after modulating;
In E, the radio receiver (2), radio receiver (2-2) receives also demodulation from the wireless signal of wireless base station apparatus (1) by receiving antenna (2-1), and obtains the content information of described each harmonic;
F, second CPU element (2-3) obtain the content information of described each harmonic, and show the content of the each harmonic in the line voltage of surveying by display module (2-4).
7, the method for work of the circuit arrangement of power grid harmonious radio detector according to claim 6, it is characterized in that: in above-mentioned steps C, when first CPU element (1-3) according to described detection voltage analysis line voltage in during the information of each harmonic content, a plurality of complete cycle of the waveform and these shape informations being deposited in the memory buffer of first CPU element (1-3) of the described detection voltage of the first continuous acquisition of first CPU element (1-3); An every collection waveform complete cycle, first CPU element (1-3) just checks once whether its memory buffer is full, when this buffer zone is full, begin to adopt fast fourier transform that a plurality of complete cycle of the waveform of described collection is analyzed, and draw the content of each harmonic in this line voltage.
8, the method for work of the circuit arrangement of power grid harmonious radio detector according to claim 7, it is characterized in that: the sound and light signal control output end output services status signal of first CPU element (1-3), guide sound light signal generation circuit (1-6) behind driving circuit (1-5), whether working properly with prompting wireless base station apparatus (1).
9, the method for work of the circuit arrangement of power grid harmonious radio detector according to claim 8, it is characterized in that: before above-mentioned steps A-F, frequency adjustable square-wave generator (1-7) produces power frequency reference square wave signal and sends into the simulation mains voltage signal input end of first CPU element (1-3), carries out equipment self-inspection with the simulation mains voltage signal; If sound and light signal generation circuit (1-6) sends sound and light signal, then self check success, wireless base station apparatus (1) can be working properly; Otherwise, fail self-test then, wireless base station apparatus (1) can not be working properly.
10, the method for work of the circuit arrangement of power grid harmonious radio detector according to claim 6, it is characterized in that: the described high-voltage fence voltage signal that electrode (1-1) is gathered is coupled into the detection voltage method by standard-field strength method, comprising: magnetic field coupled method and field coupled method.
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| CN111122954B (en) * | 2019-12-20 | 2022-01-14 | 国网浙江海盐县供电有限公司 | Portable high-voltage line digital electricity test indicator and indication method thereof |
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Application publication date: 20070815 Assignee: Changzhou Pacific Automatic Technology Co.,Ltd. Assignor: CHANGZHOU CAMPUS OF HOHAI University Contract record no.: 2010320000368 Denomination of invention: The circuit device of the power grid harmonious radio detector and its working method Granted publication date: 20081224 License type: Exclusive License Record date: 20100409 |
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