CN107782975A - Distributed grounding resistance detection system and detection method based on radio signal source - Google Patents
Distributed grounding resistance detection system and detection method based on radio signal source Download PDFInfo
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/20—Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
- G01R27/205—Measuring contact resistance of connections, e.g. of earth connections
Abstract
Description
Technical field
The present invention relates to field of power transmission, particularly relates to a kind of distributed insulating resistance measuring based on radio signal source System and detection method.
Background technology
Prevention damage to crops caused by thunder is that the problem of having to consider when high-voltage power transmission tower is built, earthing or grounding means is installed in transmission line of electricity It is a basic measures for preventing damage to crops caused by thunder.But because down conductor is typically exposed in natural environment, it is easy to by wind The damage of the force majeure such as rain erosion, causes the corrosion or fracture of earthing or grounding means.This will substantially reduce transmission tower earthing or grounding means Lightning-arrest effect, improve transmission tower and the risk factor damaged occur.Therefore the grounding resistance of detection transmission tower is high pressure A transmission tower step very crucial when overhauling.
At present, measuring the method for the grounding resistance of transmission tower mainly has three electrode method or split-core type meter method, comparatively speaking, pincers For table method because its principle is relatively advanced, application is more extensive.But whether being three electrode method or split-core type meter method, do not have at present special The distributed insulating resistance measuring method based on radio signal source, be required for wire transmission mutual voltage during measurement.
More conventional method is split-core type meter method at present, and it uses contactless measurement, only need to be by split-core type meter in measurement It is clipped on the downlead of transmission tower, without individually arranging current source and voltage source again, it is possible to measure grounding resistance.Work as utilization Split-core type meter carries out needing to ensure transmission tower single-point grounding during grounding resistance measurement, that is, is retaining shaft tower wherein downlead Under the premise of open other down conductors of shaft tower, then split-core type meter pincers are measured on the downlead of reservation, in repetition State operation, you can measure the resistance on the four grounded downlead of shaft tower.By the resistance on known four grounded downlead, lead to Cross the grounding resistance that respective formula calculates transmission tower.
Inventor, which studies, to be found, the prior art at least has following technical problem：When shaft tower pin and tester Distant, the wire connected on down conductor between transformer and tester during measurement is long and heavy, not readily portable； Folder transformer behaviour is taken when causing repeatedly to take folder transformer operation inconvenience during measurement second, wire is long, and measuring multiple transmission towers Make cumbersome.
The content of the invention
The present invention provides a kind of distributed grounding resistance detection system and detection method based on radio signal source, not only up to The required precision of measurement has been arrived, has taken folder transformer cumbersome when also solving wired measuring and long wire is not readily portable Problem.
In order to solve the above technical problems, present invention offer technical scheme is as follows：
On the one hand, the present invention provides a kind of distributed grounding resistance detection system based on radio signal source, including wireless Earth resistance tester and transformer, wherein：
The wireless earth resistance tester includes power module (1), control core module (2), pumping signal and mould occurs Block (3), frequency modulation transmitter module (4), Zigbee module (5) and communication module (6)；
The power module (1) is responsible for whole wireless earth resistance tester and provides suitable voltage, from lithium electronics Battery passes it through each module for power supply to the wireless earth resistance tester after a variety of reduction voltage circuits；
The control core module (2) is made up of single-chip microcomputer and peripheral functional modules, is responsible at man-machine interaction and information Reason.The control core module (2) is responsible for four tasks：First, module (3), which occurs, for the control pumping signal produces specified electricity Pressure；Second, receiving mutual inductance current value and phase difference that the Zigbee module (5) is transmitted, grounding resistance resistance is calculated by formula 1 Anti- value, wherein Represent that each voltage transformer senses the voltage on downlead respectively, Represent respectively due to electric current caused by induced voltage on each downlead, when change voltage transformer induced voltage positionWhen, electric current caused by induced voltage isR11、R12、R13、R14Point Not Biao Shi shaft tower four downleads resistance, ZgeFor grounding resistance impedance value；Third, sent by the Zigbee module (5) Control command is to the transformer；Fourth, the relevant information of tower-footing impedance value and other transmission towers is transferred to described logical Believe module (6)；
Module (3), which occurs, for the pumping signal includes signal generating module and power amplifier module, passes through the control core The control of core module (2) produces sine wave exciting signal, and the load that circuit is then improved by the power amplifier module drives AC signal after conditioning is transferred to the frequency modulation transmitter module (4) by ability so as to driving voltage transformer；
The frequency modulation transmitter module (4) handles voltage caused by pumping signal generation module (3) by frequency modulation Send to the transformer；
Induced electricity flow valuve that the Zigbee module (15) that the Zigbee module (5) is responsible for receiving the transformer is sent and Phase difference；
The communication module (6) is GPRS module, is responsible for long-range transmission shaft tower position, time of measuring, tower-footing impedance It is worth to electric power line pole tower inspection monitoring system；
The transformer includes power module (7), FM receiver module (8), synchronization module (9), voltage transformer mould Block (10), current transformer module (11), Signal-regulated kinase (12), phase measurement module (13), MCU control module (14), Zigbee module (15) and selftest module (16)；
The power module (7) is responsible for the transformer and provides suitable voltage, is passed it through from lithium ion battery Each module for power supply of the transformer is given after a variety of reduction voltage circuits；
The FM receiver module (8) is responsible for receiving the frequency modulation transmitter module of the wireless earth resistance tester (4) voltage after the frequency modulation sent out, it is sent to the synchronization module (9)；
The synchronization module (9) is responsible for receiving the control instruction that the MCU control module (14) sends over, whole to realize The signal of four transformers is synchronous in individual system, and the signal after synchronization is transferred into the voltage transformer module (10)；
Voltage transformer module (10) summation current transformer module (11) series connection, is a pair of transformer jaws, measurement When be clipped on a shaft tower down conductor, the voltage x current on the down conductor of shaft tower is measured with calculate ground connection electricity Hinder resistance；
The Signal-regulated kinase (12) includes Current Voltage modular converter, voltage follower, bandpass filter and handed over straight Flow change-over circuit.Changed after the induced-current that the current transformer (11) transmits is received by the Current Voltage Module is converted to magnitude of voltage, then keeps the stabilization of signal by the voltage follower, then by the bandpass filter It is filtered and amplifies, ac voltage signal is finally converted into d. c. voltage signal by the ac-dc converter circuit, and Signal is delivered into the MCU control module (14) to be handled；
The phase measurement module (13) connects voltage transformer module (10) the summation current transformer module (11), will The zero-crossing examination of mutual voltage and mutual inducing current comes out, and delivers to the MCU control module (14) and handled；
The MCU control module (14) has three functions：First, receive the control that the Zigbee module (15) transmits System order；Second, the control synchronization module (9) and selftest module (16) carry out signal synchronization and self-test；Third, receive the letter The signal that number conditioning module (12) and phase measurement module (13) transmission come is to determine mutual inductance current value and mutual voltage electric current phase Potential difference, and current value and phase difference are transferred to the Zigbee module (15)；
Zigbee module (15) the mutual inductance current value and mutual voltage current and phase difference are sent to the wireless ground connection electricity The Zigbee module (5) of resistance tester is subsequently calculated；Receive what the wireless earth resistance tester sended over simultaneously Control instruction, relevant control is carried out to the MCU control module (14) of the transformer；
The selftest module (16) is after the signal of electric current self-test or voltage self-test of the MCU control module (14) is received By controlling the opening and closing of the voltage transformer (10) summation current transformer (11) to voltage transformer (10) summation current transformer (11) self-test is carried out, to ensure measurement accuracy.
On the other hand, the present invention also provides a kind of detection of the distributed grounding resistance detection system based on radio signal source Method, including：
Step 1：Each pair of voltage transformer summation current transformer of transformer is clipped in by the consistent mode of extreme direction of the same name On down conductor；
Step 2：The wireless earth resistance tester, which sends instruction, makes the pumping signal module (3) occur and with reference to electricity Signal generating module is pressed to produce corresponding sine voltage signal, sine voltage signal passes through after signal amplification and power amplification The frequency modulation transmitter module (4) carries out frequency modulation；
Step 3：Frequency modulation AC signal is passed to the synchronization module (9) after being demodulated by the FM receiver module (8) and entered Row is synchronous；
Step 4：The MCU control module (14) of the transformer is made to send self-checking command, equipment is according to the different difference of instruction Voltage transformer summation current transformer is closed so as to realize self-test；
Step 5：Signal after synchronization drives the voltage transformer (10), and this voltage signal is sensed to grounding lead Line；
Step 6：By the electric current in the current transformer (11) inductive grounding downlead, institute is passed to after signal condition State the MCU control module (14) of sensor, while the phase measurement module (13) is by the zero-crossing examination of mutual voltage electric current Out pass to the MCU control module (14)；
Step 7：The MCU control module (14) calculates the phase difference of mutual inducing current and mutual voltage electric current, and will Phase difference and current information are passed back in pole tower ground resistance tester via the Zigbee module (15)；
Step 8：Inside pole tower ground resistance tester, the control core module (2) is by the current information and phase Information carries out a series of Treatment Analysis, and solving equation according to formula 1 draws grounding resistance impedance value；
Step 9：If the result of the self-test after calculating meets the requirements, you can is normally measured, by controlling the mutual inductance Signal amplitude and frequency on device, repeating said steps 7 and step 8.
Further, the detection method also includes：
Step 10：The wireless earth resistance tester sends correlation measurement information to center monitoring by GPRS module Computer, and by data storage.
The invention has the advantages that：
The distributed grounding resistance detection system and detection method based on radio signal source of the present invention, with being wirelessly transferred Mode will caused by signal source excitation using high-speed digital circuit delay line design carry out signal synchronization after be sent to clamp Transformer, and the induced-current that mutual inductor measuring is obtained wirelessly sends back earth resistance tester and calculated.Most The relevant information measured at last is sent to centralized monitoring computer by GPRS, completes the survey of the grounding resistance to a shaft tower Amount.The present invention exempts from solution line mensuration measurement of Grounding Resistance using based on radio signal source, and the precision for not only reached measurement will Ask, the problem of folder transformer is cumbersome and long wire is not readily portable is taken when also solving wired measuring.
Brief description of the drawings
Fig. 1 is the wireless earth resistance of the distributed grounding resistance detection system based on radio signal source of the present invention The circuit frame figure of instrument；
Fig. 2 is the circuit frame of the transformer of the distributed grounding resistance detection system based on radio signal source of the present invention Figure；
Fig. 3 is the signal of the synchronization module of the distributed grounding resistance detection system based on radio signal source of the present invention Figure；
Fig. 4 is the signal of the Postponement module of the distributed grounding resistance detection system based on radio signal source of the present invention Figure；
Fig. 5 is the FM receiver module of the distributed grounding resistance detection system based on radio signal source of the present invention Schematic diagram.
Embodiment
To make the technical problem to be solved in the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing and tool Body embodiment is described in detail.
On the one hand, the present invention provides a kind of distributed grounding resistance detection system based on radio signal source, such as Fig. 1~figure Shown in 5, including wireless earth resistance tester and transformer, wherein：
Wireless earth resistance tester includes power module 1, control core module 2, pumping signal and module 3, frequency modulation occurs Transmitter module 4, Zigbee module 5 and communication module 6；
Power module 1 is responsible for whole wireless earth resistance tester and provides suitable voltage, can select lithium electronics electricity Pond passes it through each module for power supply to wireless earth resistance tester after a variety of reduction voltage circuits；
Control core module 2 is made up of single-chip microcomputer and peripheral functional modules, is responsible for the work such as man-machine interaction and information processing Make.Control core module 2 is responsible for four tasks：First, module 3, which occurs, for control pumping signal produces rated voltage；Second, receive The mutual inductance current value and phase difference that Zigbee module 5 transmits, grounding resistance impedance value is calculated by formula 1, whereinRepresent that each voltage transformer senses the voltage on downlead respectively,Point Do not represent due to electric current caused by induced voltage on each downlead, when change voltage transformer induced voltage positionWhen, electric current caused by induced voltage isR11、R12、R13、R14Respectively Represent the resistance of four downleads of shaft tower, ZgeFor grounding resistance impedance value；Third, control command is sent by Zigbee module 5 To transformer；Fourth, the relevant information of tower-footing impedance value and other transmission towers is transferred to communication module 6；
Module 3, which occurs, for pumping signal includes signal generating module and power amplifier module, passes through the control of control core module 2 System produces sine wave exciting signal, and the load driving force of circuit is then improved by power amplifier module so as to which driving voltage is mutual Sensor, and the AC signal after conditioning is transferred to frequency modulation transmitter module 4；
Pumping signal voltage caused by module 3 and handles transmission to transformer by frequency modulation by frequency modulation transmitter module 4 occurs；
Zigbee module 5 is responsible for receiving induced electricity flow valuve and the phase difference that the Zigbee module 15 of transformer is sent；
Communication module 6 can be GPRS module, be responsible for long-range transmission shaft tower position, time of measuring, tower-footing impedance value Etc. relevant information to electric power line pole tower inspection monitoring system；
It is mutual that transformer includes power module 7, FM receiver module 8, synchronization module 9, voltage transformer module 10, electric current Sensor module 11, Signal-regulated kinase 12, phase measurement module 13, MCU control module 14, Zigbee module 15 and selftest module 16；
Power module 7 is responsible for transformer and provides suitable voltage, can pass it through a variety of drops from lithium ion battery Each module for power supply of transformer is given after volt circuit；
FM receiver module 8 is responsible for receiving the tune that the frequency modulation transmitter module 4 of wireless earth resistance tester is sent out Voltage after frequency, it is sent to synchronization module 9；
Synchronization module 9 is responsible for receiving the control instruction that MCU control module 14 sends over, to realize in whole system four The signal of transformer is synchronous, and the signal after synchronization is transferred into voltage transformer module 10；
The summation current transformer module 11 of voltage transformer module 10 is connected, and is a pair of transformer jaws, is clipped in one during measurement On bar shaft tower down conductor, the voltage x current on the down conductor of shaft tower is measured to calculate grounding resistance resistance；
Signal-regulated kinase 12 includes Current Voltage modular converter, voltage follower, bandpass filter and AC-DC conversion Circuit.Voltage is converted to by Current Voltage modular converter after the induced-current that current transformer 11 transmits is received Value, then keeps the stabilization of signal by voltage follower, then is filtered and amplifies by bandpass filter, finally passes through Ac voltage signal is converted to d. c. voltage signal by ac-dc converter circuit, and signal is delivered into MCU control module 14 and carried out Processing；
Phase measurement module 13 connects the summation current transformer module 11 of voltage transformer module 10, by mutual voltage and mutual inductance The zero-crossing examination of electric current comes out, and delivers to MCU control module 14 and handled；
MCU control module 14 has three functions：First, receive the control command that Zigbee module 15 transmits；Second, control Synchronization module 9 and selftest module 16 processed carry out signal synchronization and self-test；Third, reception signal conditioning module 12 and phase measurement mould Current value and phase difference are transferred to by the signal that the transmission of block 13 comes with determining mutual inductance current value and mutual voltage current and phase difference Zigbee module 15；
The mutual inductance current value of Zigbee module 15 and mutual voltage current and phase difference are sent to wireless earth resistance tester Zigbee module 5 is subsequently calculated；The control instruction that wireless earth resistance tester sends over is received simultaneously, to transformer MCU control module 14 carry out relevant control；
Selftest module 16 passes through control voltage after the signal of electric current self-test or voltage self-test of MCU control module 14 is received The opening and closing of the summation current transformer 11 of transformer 10 carries out self-test to the summation current transformer 11 of voltage transformer 10, to ensure measurement essence Degree.
The distributed grounding resistance detection system based on radio signal source of the present invention, will letter by way of being wirelessly transferred Excitation caused by number source is sent to clamp transformer after carrying out signal synchronization using the delay line design of high-speed digital circuit, and will The induced-current that mutual inductor measuring obtains wirelessly sends back earth resistance tester and calculated.The phase most measured at last Close information and centralized monitoring computer is sent to by GPRS, complete the measurement of the grounding resistance to a shaft tower.The present invention uses Solution line mensuration measurement of Grounding Resistance is exempted from based on radio signal source, the required precision of measurement has not been only reached, has also solved Line takes the problem of folder transformer is cumbersome and long wire is not readily portable when measuring.
The distributed grounding resistance detection system based on radio signal source of the present invention includes a wireless grounding resistance and surveyed Instrument and four transformers are tried, in use, four transformers are clipped on the four grounded downlead of transmission tower, wireless grounding resistance Tester is put in transmission tower bottom centre position, is passed between wireless earth resistance tester and transformer by wireless signal It is defeated.
Further, synchronization module 9 is responsible for the synchronization between different transformers, as shown in figure 3, synchronization module 9 includes work( Rate amplification module 901, signal selection module 902, zero passage detection module 903 and Postponement module 904, wherein：
Power amplifier module 901 is responsible for the signal after FM receiver module 8 is demodulated and carries out two kinds of different degrees of width Value amplification, and transfer to select the signal of which kind of amplitude in the selection circuit of signal selection module 902；
Signal selection module 902 is responsible for the signal of the signalling channel selection suitable amplitude of system, to carry out amplitude Measurement；
Zero passage detection module 903 is responsible for that signal is become positive zero-crossing examination and come out by negative, and detect the tenth (can Any to choose, to reduce error) a mark t is sent to control core module 17 after zero crossing, thus control core module 17 The time difference Δ t of zero crossing between four transducer signals can be obtained；
Now control core module 17, which can calculate, will keep what the signal of synchronous the other three transformer part to be delayed Length, and it is sent to Postponement module 904；
Postponement module 904 is responsible for selecting signal after the delay length sent by control core module 17 is determined Select the analog signalses that module 902 transmits and switch to data signal and carried out by the delay line that is made up of FIFO memory Delay so that the signal of four transformers is synchronous, then is translated into analog signal and is sent to voltage transformer module 10 and carry out Measurement；
In the present invention, Postponement module 904 is responsible for analog signal carrying out a certain degree of delay, as shown in figure 4, delay mould Block 904 includes A/D modules 9041, fifo module 9042, CPLD modules 9043 and D/A modules 9044, wherein：
The analog-signal transitions that A/D modules 9041 are responsible for transmitting signal selection module 902 are data signal, and are sent into In fifo module 9042.The AD6645 of Analog Device companies can be chosen, AD6645 is high speed, high-performance, single chip integrated 14 analog/digital conversion chips, sampling rate are 80MHz or 105MHz；
Fifo module 9042 writes FIFO memory in the case where CPLD modules 9043 write the control of sequential and cached successively, greatly Capacity FIFO chip uses the IDT72V360 of Integrated Device Technology, Inc., and the chip storage capacity is 072 × 36bit of 13l, input and output Mouth can be arranged as required to as 9,18,36 bit wides, and the chip belt is empty, full, half-full and programmable setting sky, full scale will are drawn Pin, and can flexible expansion storage depth and width, reach as high as 166MHz working clock frequency；
CPLD modules 9043 send when reaching required time delay and read clock signal to fifo module 9042, from And output digit signals deliver to D/A modules 9044, PLD chip (CPLD) is using Lattice companies IspMACH4000 series LC4128V75T100, its maximum operating frequency 400MHz；
The digital signal transition that D/A modules 9044 are responsible for exporting fifo module 9042 is mutual with driving voltage for analog signal Sensor 10, can choose the AD9754 of Analog Device companies, switching rate 125MHz, inside resolution ratio 14bit, AD9754 Controllable amplifier is integrated with, 2~20mA electric current can be exported, and can flexibly be configured to single-ended or difference output mode.
Preferably, as shown in figure 5, FM receiver module 8 includes high-frequency signal amplifier 801, phaselocked loop 802 and low pass Wave filter 803, wherein：
High-frequency signal amplifier 801 is responsible for amplifying FM signal, and is sent into phaselocked loop 802；
Phaselocked loop 802 carries out signal demodulation output services after the signal after receiving high-frequency signal amplifier 801 and amplifying；
Phaselocked loop 802 includes phase discriminator 8021, voltage controlled oscillator 8022 and follower 8023；
Low pass filter 803 is responsible for the phase error voltage obtained after the phase demodulation of phase discriminator 8021 filtering high-frequency components, So as to obtain the signal for changing and changing with frequency modulating signal；
The output that phase discriminator 8021 is responsible for the signal after high-frequency signal amplifier 801 is amplified and voltage controlled oscillator 8022 is reflected The phase error voltage of change is mutually obtained, and is sent to low pass filter 803；
Voltage controlled oscillator 8022 receives the letter for changing with frequency modulating signal and changing after low-pass filtered device 803 is handled Number, and output is sent into phase discriminator 8021；
Follower 8023 receives the signal for changing with frequency modulating signal and changing after low-pass filtered device 803 is handled, Required demodulated signal is obtained after processing.
In the present invention, frequency-modulated wave is sent into phaselocked loop 802 after the amplification of high-frequency signal amplifier 801.In phaselocked loop In 802, the output of frequency-modulated wave and voltage controlled oscillator 8022 is admitted to phase discriminator 8021, and the phase error electricity of change is obtained through phase demodulation Pressure, the error voltage are filtered its high-frequency components by low pass filter 803, are then obtained and are changed and become with frequency modulating signal The signal of change, demodulated signal is obtained through follower 8023, it is achieved thereby that demodulating process.
On the other hand, the present invention also provides a kind of detection of the distributed grounding resistance detection system based on radio signal source Method, including：
Step 1：Each pair of voltage transformer summation current transformer of transformer is clipped in by the consistent mode of extreme direction of the same name On down conductor；
Step 2：Wireless earth resistance tester, which sends instruction, makes pumping signal that module 3 and reference voltage signal generation occur Module produces corresponding sine voltage signal, and sine voltage signal passes through frequency modulation transmitter after signal amplification and power amplification Module 4 carries out frequency modulation；
Step 3：Frequency modulation AC signal is passed to synchronization module 9 after being demodulated by FM receiver module 8 and synchronized；
Step 4：The MCU control module 14 of transformer is made to send self-checking command, equipment closes electricity respectively according to instruction is different Transformer summation current transformer is pressed to realize self-test；
Step 5：Signal driving voltage transformer 10 after synchronization, and this voltage signal is sensed to down conductor；
Step 6：By the electric current in the inductive grounding downlead of current transformer 11, sensor is passed to after signal condition MCU control module 14, while the zero-crossing examination of mutual voltage electric current is out passed to MCU control module by phase measurement module 13 14；
Step 7：MCU control module 14 calculates the phase difference of mutual inducing current and mutual voltage electric current, and by phase difference Passed back with current information via Zigbee module 15 in pole tower ground resistance tester；
Step 8：Inside pole tower ground resistance tester, control core module 2 enters the current information and phase information A series of Treatment Analysis of row, solve equation according to formula 1 and draw grounding resistance impedance value；
Step 9：If the result of the self-test after calculating meets the requirements, you can is normally measured, by controlling on transformer Signal amplitude and frequency, repeat step 7 and step 8.
The detection method of the distributed grounding resistance detection system based on radio signal source of the present invention, with being wirelessly transferred Mode will caused by signal source excitation using high-speed digital circuit delay line design carry out signal synchronization after be sent to clamp Transformer, and the induced-current that mutual inductor measuring is obtained wirelessly sends back earth resistance tester and calculated.This Invention exempts from solution line mensuration measurement of Grounding Resistance using based on radio signal source, has not only reached the required precision of measurement, also Solve the problems, such as to take folder transformer cumbersome during wired measuring and long wire is not readily portable.
Further, detection method can also include：
Step 10：Wireless earth resistance tester, which sends correlation measurement information to center monitoring by GPRS module, to be calculated Machine, and by data storage.
In the present invention：
(1) emphasis of the present invention is transmitted as using mode of frequency regulation transmission mutual voltage, mode of frequency regulation.Wireless grounding resistance is surveyed Voltage caused by excitation generating module is handled transmission to transformer part by the frequency modulation transmitter module for trying instrument by frequency modulation.Due to Pumping signal is modulated onto high frequency after modulation, and the distance that modulated signal is passed through between modulation receiver is time-consuming very short, and modulated signal is supported It can be ignored up to phase difference caused by four transformers, pumping signal can still be considered as reaching transmission tower four simultaneously Transformer part at ground lead.And the FM receiver module of transformer part is responsible for receiving wireless earth resistance tester Voltage after the frequency modulation that part frequency modulation transmitter module is sent out, voltage transformer mould is sent into after converting it into suitable voltage Block.
(2) signal is synchronously how to realize the difficult point place of mode of frequency regulation transmission, between the different transformers of holding Signal is synchronous, and the present invention carries out signal delay using the delay line design of high-speed digital circuit.
Signal is come out by the positive zero-crossing examination of negative change by the zero passage detection mould 903 of transformer part, and detected After tenth zero crossing (can arbitrarily select to reduce error) a mark t is sent to control core module 17.Thus core is controlled Core module 17 can obtain the time difference Δ t of zero crossing between four transducer signals1, Δ t2, Δ t3.Therefore control core module 17 Can calculate will keep the signal of the synchronous the other three transformer part length t to be delayed1, t2, t3, and by these three length Value is sent to Postponement module 904.Postponement module 904 after the delay length sent by control core module 17 is determined, The analog signalses that signal selection module 902 transmits are switched into data signal and pass through the delay line that is made up of FIFO memory Circuit is postponed so that the signal of four transformers is synchronous, then is translated into analog signal and is sent to voltage transformer mould Block 10 measures.The synchronization of two signals can be controlled after being designed using delay line by negative-feedback.
(3) signal delay is carried out using the delay line design of high-speed digital circuit, principle is that high frequency analog signals enter A/D Module 9041 is converted to data signal, and writing fifo module 9042 successively in the case where CPLD modules 9043 write the control of sequential is delayed Deposit, when reaching required time delay, CPLD modules 9043, which are sent, reads clock signal to fifo module 9042, so as to export Data signal send D/A modules 9044 to recover original analog signal.The analog signal of output is except phase is with inputting analog signal not With outside, amplitude and frequency are all identical.Can be very good in this way solve frequency modulation after the nonsynchronous problem of signal.
(4) AC signal after frequency modulation drives transformer after being demodulated by FM receiver.FM signal passes through high-frequency signal After amplifier amplification, it is sent into phaselocked loop.In phaselocked loop, the output of frequency-modulated wave and voltage controlled oscillator is admitted to phase discriminator, warp Phase demodulation obtains the phase error voltage of change, and the error voltage is filtered its high-frequency components by low pass filter, then obtained The signal for changing with frequency modulating signal and changing, demodulated signal is obtained through follower, and transformer is driven with the demodulated signal.
Described above is the preferred embodiment of the present invention, it is noted that for those skilled in the art For, on the premise of principle of the present invention is not departed from, some improvements and modifications can also be made, these improvements and modifications It should be regarded as protection scope of the present invention.
Claims (6)
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