CN104330615A - Multi-phase measuring device of lightning arrester and transformer based on FFT algorithm and method thereof - Google Patents
Multi-phase measuring device of lightning arrester and transformer based on FFT algorithm and method thereof Download PDFInfo
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Abstract
The invention discloses a multi-phase measuring device of lightning arrester and transformer based on FFT algorithm and method thereof, and the device comprises a comparing circuit, four testing circuits being the same in structure, an analyzing control module and a wireless module; the comparing circuit comprises an optical coupling isolation circuit and zero crossing comparing circuit, one end of the optical coupling isolation circuit is connected to one phase of the A, B, C of the power transmission line while the other end thereof is connected to the input end of the zero crossing comparing circuit, the other end of the zero crossing comparing circuit is connected to the analyzing control module; the full current of the A phase, B phase, C phase and the N phase are monitored at the same time, the full current is transformed via Fourier to obtain the resistance current, which is analyzed to remove the interference to the capacitative current, the detection sensitivity is increased; the running state of the lightning arrester and transformer is monitored in on line mode at real time for reducing the non-scheduled outage and running accident; the recondition expense is reduced, the early failure signal and the continuous real time tracking fault evolution process of the lightning arrester and transformer are monitored.
Description
Technical field
The invention discloses a kind of based on the lightning arrester of fft algorithm and the how identical survey devices and methods therefor of transformer, be specifically related to lightning arrester monitoring technical field.
Background technology
Lightning arrester is one of visual plant of electric system, and the effect of lightning arrester is used to protect the electrical equipment that in electric system, various electric equipment impacts from lightning surge, switching overvoltage, Frequency Transient Overvoltage and damages.The type of lightning arrester mainly contains portable protective gaps, valve-type arrester and Zinc-Oxide Arrester.Portable protective gaps is mainly used in limiting atmospheric over-voltage, is generally used for distribution system, circuit and inlet wire of substation segment protect.Valve-type arrester and Zinc-Oxide Arrester are used for the protection of electric substation and generating plant, are mainly used in limiting atmospheric over-voltage at 500KV and following system, also limit be used for internal overvoltage or do the back-up protection of internal overvoltage in extra high voltage system.
Along with lightning arrester put into operation the time growth with and products thereof the defect that exists, lightning arrester making moist under working voltage, problem of aging become increasingly conspicuous.In order to the hidden danger of Timeliness coverage lightning arrester, need its operation conditions on-line monitoring, need the total current of monitoring lightning arrester and transformer, the built-in electrical insulation situation of lightning arrester and transformer is monitored, thus the working condition of Timeliness coverage transformer and lightning arrester, at present, on-line monitoring to the Main Means of lightning arrester state on_line monitoring, current detection technique can not realize three-phase current voltage and detect simultaneously, thus directly cannot observe the working condition of lightning arrester at one time, existing lightning arrester monitoring device does not all have remote transmission function in addition, operating personnel are needed to read to scene, thus lose time and energy, can not check intuitively simultaneously, efficiently cannot check analysis to data, the situation of effective prediction Leakage Current, can not effectively increase work efficiency.
Cross the normal Zinc-Oxide Arrester run by capacity current and current in resistance property, because the spacing of zinc oxide fine particles is very little, its equivalent capacity is comparatively large, and therefore, in total current, capacity current accounts for principal ingredient; Zinc-Oxide Arrester because of make moist or aging after, mainly current in resistance property changes (generally showing as to leak increases), if only detect total current, the subtle change of its current in resistance property by bury in oblivion by much bigger capacitive point stream, the sensitivity detected is very low, often can not find early stage defect pipelines.These problems are all current problems in urgent need to solve.
Summary of the invention
Technical matters to be solved by this invention is: for the defect of prior art, there is provided a kind of based on the lightning arrester of fft algorithm and the how identical survey devices and methods therefor of transformer, monitor time identical with N to the total current of A, B, C three-phase, the total current obtained is carried out conversion based on Fourier simultaneously and obtain current in resistance property, analyze the interference that current in resistance property gets rid of capacity current, the sensitivity of detection is increased; The running status of on-line real time monitoring lightning arrester and transformer, reduces unplanned power failure and interruption of service, increases work efficiency, and alleviates the labour intensity of staff; Reduce recondition expense, extend the prophylactic repair time interval, the initial failure signal of monitoring lightning arrester and transformer, tracking fault evolution process real-time continuously, science is Load adjustment dynamically.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
Based on the lightning arrester of fft algorithm and a how identical survey device for transformer, comprise comparator circuit, test circuit, analysis and Control module, wireless module that four structures are identical;
Wherein comparator circuit comprises optical coupling isolation circuit, Zero-cross comparator circuit, one end of described optical coupling isolation circuit is connected mutually with in power transmission line A, B, C three-phase, the other end of optical coupling isolation circuit is connected with the input end of Zero-cross comparator circuit, and the other end of described Zero-cross comparator circuit is connected with analysis and Control module;
Test circuit comprises zinc paste MOV leakage of current loop, mutual inductor, current-to-voltage converting circuit, filtering circuit, amplifier, the wherein said one end in zinc paste MOV leakage of current loop is connected with of four power transmission lines, the other end in described zinc paste MOV leakage of current loop is responded to mutually with the winding of mutual inductor, the output terminal of mutual inductor is connected with the input end of current-to-voltage converting circuit, the output terminal of described current-to-voltage converting circuit is connected with the input end of filtering circuit, the output terminal of described filtering circuit is connected with the input end of described amplifier, the output terminal of described amplifier is connected with analysis and Control module,
Described analysis and Control module is also connected with wireless module;
As further prioritization scheme of the present invention, described filtering circuit adopts RC filtering circuit.
As further prioritization scheme of the present invention, described Zero-cross comparator circuit, adopts low-power consumption amplifier mode to carry out zero-crossing examination to common frequency power network frequency.
As further prioritization scheme of the present invention, described analysis and Control module adopts MCU controller, and MCU controller is STM32L single-chip microcomputer.
As further prioritization scheme of the present invention, described wireless module adopts SI4432 small wireless transmission chip.
As further prioritization scheme of the present invention, described amplifier is three gain per stage adjustable amplifiers.
As further prioritization scheme of the present invention, described mutual inductor is punch current transfomer.
As further prioritization scheme of the present invention, described current-to-voltage converting circuit adopts low-power integrated operational amplifier and accurate sampling resistor, forms inverse proportion current-to-voltage converting circuit.
As further prioritization scheme of the present invention, also comprise temperature sensor, humidity sensor, display module, GPS module, checking of great current coil and current detection module, wherein temperature sensor, humidity sensor, display module, GPS module, checking of great current coil and current detection module are all connected with analysis and Control module, temperature sensor, the temperature data that humidity sensor will detect, humidity data sends to analysis and Control module, after analysis and Control module is analyzed the temperature data received and humidity data, final data are shown at display module, the longitude and latitude recorded and latitude information are sent to analysis and Control module by GPS module, and the longitude and latitude and latitude information of analyzing gained show by analysis and Control module in display module, checking of great current Coil Detector flows through the information of the superpotential electric current of lightning arrester inside, and is sent to analysis and Control module, and analysis and Control module obtains the peak value of electric current, wavelength and waveform by analyzing the information of electric current, and is sent by wireless module, current detection module by the lightning arrester surface of detection Leakage Current value be sent to analysis and Control module, analysis and Control module converts the Leakage Current value obtained to pollution degree, and shows at display module.
Based on the lightning arrester of fft algorithm and a how identical survey devices and methods therefor for transformer, it is characterized in that: comprise the steps:
Step one: the Leakage Current of A phase, B phase, C phase and N phase enters zinc paste MOV leakage of current loop, leakage total current, the leakage total current in mutual inductor acquisition zinc paste MOV leakage of current loop enter current-to-voltage converting circuit through the coupling of mutual inductor in the mode of electric current;
Step 2: electric current is converted to voltage by current-to-voltage converting circuit, is then sent to filter unit by voltage, filtering interference signals, then enters the AD sample port being input to analysis and Control module after amplification is wherein amplified;
Step 3: optical coupling isolation circuit obtains the voltage of a coupled phase as the reference voltage, Zero-cross comparator circuit obtains the AD analog sampling module of output low level triggering analysis control module inside after reference voltage, and AD analog sampling module is according to the total current point of the second-phase in sample frequency continuous sampling three-phase A, B, C;
Step 4: the total current of gained point is carried out Fourier transform by analysis and Control module, obtain the amplitude of current first harmonics, then the best magnification of analysis and Control module resonance-amplifier, the phase angle of current first harmonics signal is drawn according to the total current after Fourier transform, according to the phase order relation between three-phase electricity, phasing degree increases by 120 ° successively, the then angle a of this phasing degree namely between this phase total current with this phase current in resistance property, according to sciagraphy, the cosine value that the total current of this phase is multiplied by angle a is the current in resistance property of this phase, Fourier transform is carried out to this current in resistance property and obtains third harmonic, return step, calculate the total current of third phase, current in resistance property and third harmonic.
The present invention adopts above technical scheme compared with prior art, has following technique effect:
First: monitor when the present invention is identical with N to the total current of A, B, C three-phase, the total current obtained is carried out conversion based on Fourier simultaneously and obtain current in resistance property, analyze the interference that current in resistance property gets rid of capacity current, the sensitivity of detection is increased;
Second: the running status of on-line real time monitoring lightning arrester of the present invention and transformer, reduce unplanned power failure and interruption of service, increase work efficiency, alleviate the labour intensity of staff;
3rd: reduce recondition expense, extend the prophylactic repair time interval, the initial failure signal of monitoring lightning arrester and transformer, tracking fault evolution process real-time continuously, science is Load adjustment dynamically.
Accompanying drawing explanation
Fig. 1 is system architecture schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
The present invention discloses a kind of based on the lightning arrester of fft algorithm and the how identical survey device of transformer, system architecture schematic diagram of the present invention as shown in Figure 1, for A phase, B phase, C phase, N phase current, the present invention includes comparator circuit, test circuit, analysis and Control module, wireless module that four structures are identical;
For A circuitry phase, the circuit structure of B phase, C phase, N phase is identical with A phase, wherein comparator circuit comprises optical coupling isolation circuit, Zero-cross comparator circuit, according to electrical network three-phase phase sequence relation, centralized procurement is with getting B phase as the reference voltage, one end of described optical coupling isolation circuit is connected with B phase, and the other end of optical coupling isolation circuit is connected with the input end of Zero-cross comparator circuit, and the other end of described Zero-cross comparator circuit is connected with analysis and Control module;
Test circuit comprises zinc paste MOV leakage of current loop, punching mutual inductor, I/V change-over circuit and current-to-voltage converting circuit, RC filtering circuit, three gain per stage adjustable amplifiers, punching mutual inductor, the one end in wherein said zinc paste MOV leakage of current loop is connected with A phase, the other end in described zinc paste MOV leakage of current loop is responded to mutually with the winding of punching mutual inductor, the output terminal of punching mutual inductor is connected with the input end of I/V change-over circuit, the output terminal of described I/V change-over circuit is connected with the input end of RC filtering circuit, the output terminal of described RC filtering circuit is connected with the input end of described three gain per stage adjustable amplifiers, the output terminal of three gain per stage adjustable amplifiers is connected with analysis and Control module,
Analysis and Control module is also connected with wireless module, and wireless module adopts SI4432 small wireless transmission chip, and the data message recorded is sent to server by wireless module, observes data status intuitively by server;
Zero-cross comparator circuit, low-power consumption amplifier mode is adopted to carry out zero-crossing examination to common frequency power network frequency, analysis and Control module adopts MCU controller, MCU controller is STM32L single-chip microcomputer, I/V change-over circuit adopts low-power integrated operational amplifier and accurate sampling resistor, forms inverse proportion current-to-voltage converting circuit.
Adopt accurate punch current transfomer coupling scheme, realizing the loop reliable ground ensureing three-phase lightning protector under data acquisition, not by the impact of monitoring device; Sampling metal-oxide-semiconductor controls the proportion resistor parameter of direct proportion amplifier, realizes adjusting enlargement factor.
Based on the method for the lightning arrester of fft algorithm with the how identical survey device of transformer, it is characterized in that: comprise the steps:
Step one: the Leakage Current of A phase, B phase, C phase and N phase enters zinc paste MOV leakage of current loop, leakage total current, the leakage total current in punching mutual inductor acquisition zinc paste MOV leakage of current loop enter I/V change-over circuit through the coupling of punching mutual inductor in the mode of electric current;
Step 2: electric current is converted to voltage by I/V change-over circuit, is then sent to RC filter unit by voltage, filtering interference signals, then enters the AD sample port being input to MCU controller after amplification is wherein amplified;
Step 3: optical coupling isolation circuit obtains the voltage of coupled B phase as the reference voltage, after Zero-cross comparator circuit obtains reference voltage, output low level triggers the AD analog sampling module of MCU controller inside, and AD analog sampling module is according to the total current point of sample frequency continuous sampling A phase;
Step 4: the total current of gained point is carried out Fourier transform by MCU controller, obtain the amplitude of current first harmonics, then MCU controller regulates the best magnification of three gain per stage adjustable amplifiers, the phase angle of current first harmonics signal is drawn according to the total current after Fourier transform, according to the phase order relation between three-phase electricity, phasing degree increases by 120 ° successively, the then angle a of this phasing degree namely between this phase total current with this phase current in resistance property, according to sciagraphy, the total current recorded is I, current in resistance property is Ir=I*cosa, Fourier transform is carried out to this current in resistance property and obtains third harmonic, return step, calculate A phase, C phase, the total current of N phase, current in resistance property and third harmonic.
The data that this device records are sent to server by wireless module, are shown intuitively by server, and user can carry out analysis judgement to the duty of lightning arrester and transformer timely according to data, reduces recondition expense, extends the prophylactic repair time interval; According to advanced on-line analysis, the running status of immediate analysis lightning arrester and transformer, scientific management the life-span of extension device;
The initial failure signal of monitoring equipment, and real-time follow-up fault has developed exhibition process continuously; According to the actual motion information of equipment, scientifically dynamic conditioning load;
Solve iron core grounding to detect and can not detect in real time by the artificial clamp on amperemeter hand dipping that adopts, waste of manpower resource, low precision, many shortcomings such as be affected by the external environment large;
Help electric power enterprise to carry out comprehensive, directly perceived, real-time monitoring and intellectual analysis to transformer, core of reactor operation conditions, provide more accurately, more in time, more complete information;
Increase work efficiency, alleviate intensity of workers; Can be transformer, reactor repair based on condition of component provides effective technical support simultaneously; Electricity net safety stable level can be improved and ability of preventing and reducing natural disasters;
The life cycle management of reinforcement equipment monitors and management, enhances productivity, and is widely used for the strong intelligent grid of construction.
This device also comprises temperature sensor, humidity sensor, display module, GPS module, checking of great current coil and current detection module, wherein temperature sensor, humidity sensor, display module, GPS module, checking of great current coil are all connected with analysis and Control module with current detection module, the temperature data of detection, humidity data are sent to analysis and Control module by temperature sensor, humidity sensor, final data show at display module after analyzing the temperature data received and humidity data by analysis and Control module;
The longitude and latitude recorded and latitude information are sent to analysis and Control module by GPS module, and the longitude and latitude and latitude information of analyzing gained carry out showing and being sent by wireless module by analysis and Control module in display module; User learns the position at lightning arrester place by latitude and longitude information, monitors the working condition of lightning arrester position.
Checking of great current Coil Detector flows through the information of the superpotential electric current of lightning arrester inside, and be sent to analysis and Control module, analysis and Control module obtains the peak value of electric current, wavelength and waveform by analyzing the information of electric current, and be sent to server by wireless module, user observes the superpotential of lightning arrester inside by the display of server, comprise the situation of thunderbolt voltage and switching overvoltage, the fault of Timeliness coverage lightning arrester;
Current detection module by the lightning arrester surface of detection Leakage Current value be sent to analysis and Control module, analysis and Control module converts the Leakage Current value obtained to pollution degree, and shows at display module.
By reference to the accompanying drawings embodiments of the present invention are explained in detail above, but the present invention is not limited to above-mentioned embodiment, in the ken that those of ordinary skill in the art possess, can also makes a variety of changes under the prerequisite not departing from present inventive concept.Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this.Every technological thought proposed according to the present invention, and any change done on technical scheme basis, all fall within scope.
Claims (9)
1. based on the lightning arrester of fft algorithm and a how identical survey device for transformer, it is characterized in that: comprise comparator circuit, test circuit, analysis and Control module, wireless module that four structures are identical;
Wherein comparator circuit comprises optical coupling isolation circuit, Zero-cross comparator circuit, one end of described optical coupling isolation circuit is connected mutually with in power transmission line A, B, C three-phase, the other end of optical coupling isolation circuit is connected with the input end of Zero-cross comparator circuit, and the other end of described Zero-cross comparator circuit is connected with analysis and Control module;
Test circuit comprises zinc paste MOV leakage of current loop, mutual inductor, current-to-voltage converting circuit, filtering circuit, amplifier, the wherein said one end in zinc paste MOV leakage of current loop is connected with of four power transmission lines, the other end in described zinc paste MOV leakage of current loop is responded to mutually with the winding of mutual inductor, the output terminal of mutual inductor is connected with the input end of current-to-voltage converting circuit, the output terminal of described current-to-voltage converting circuit is connected with the input end of filtering circuit, the output terminal of described filtering circuit is connected with the input end of described amplifier, the output terminal of described amplifier is connected with analysis and Control module,
Described analysis and Control module is also connected with wireless module;
As claimed in claim 1 based on the lightning arrester of fft algorithm and a how identical survey device for transformer, it is characterized in that: described filtering circuit adopts RC filtering circuit.
2. a kind ofly as claimed in claim 1 or 2 to it is characterized in that: described Zero-cross comparator circuit based on the lightning arrester of fft algorithm and the how identical survey device of transformer, adopt low-power consumption amplifier mode to carry out zero-crossing examination to common frequency power network frequency.
3. a kind of based on the lightning arrester of fft algorithm and the how identical survey device of transformer as claimed in claim 3, it is characterized in that: described analysis and Control module adopts MCU controller, and MCU controller is STM32L single-chip microcomputer.
4. a kind of based on the lightning arrester of fft algorithm and the how identical survey device of transformer as claimed in claim 4, it is characterized in that: described wireless module adopts SI4432 small wireless transmission chip.
5. a kind of based on the lightning arrester of fft algorithm and the how identical survey device of transformer as claimed in claim 5, it is characterized in that: described amplifier is three gain per stage adjustable amplifiers.
6. a kind of based on the lightning arrester of fft algorithm and the how identical survey device of transformer as claimed in claim 1, it is characterized in that: described mutual inductor is punch current transfomer.
7. a kind of based on the lightning arrester of fft algorithm and the how identical survey device of transformer as claimed in claim 7, it is characterized in that: described current-to-voltage converting circuit adopts low-power integrated operational amplifier and accurate sampling resistor, form inverse proportion current-to-voltage converting circuit.
8. a kind of based on the lightning arrester of fft algorithm and the how identical survey device of transformer as claimed in claim 8, it is characterized in that: also comprise temperature sensor, humidity sensor, display module, GPS module, checking of great current coil and current detection module, wherein temperature sensor, humidity sensor, display module, GPS module, checking of great current coil and current detection module are all connected with analysis and Control module, temperature sensor, the temperature data that humidity sensor will detect, humidity data sends to analysis and Control module, after analysis and Control module is analyzed the temperature data received and humidity data, final data are shown at display module, the longitude and latitude recorded and latitude information are sent to analysis and Control module by GPS module, and the longitude and latitude and latitude information of analyzing gained show by analysis and Control module in display module, checking of great current Coil Detector flows through the information of the superpotential electric current of lightning arrester inside, and is sent to analysis and Control module, and analysis and Control module obtains the peak value of electric current, wavelength and waveform by analyzing the information of electric current, and is sent by wireless module, current detection module by the lightning arrester surface of detection Leakage Current value be sent to analysis and Control module, analysis and Control module converts the Leakage Current value obtained to pollution degree, and shows at display module.
9. a kind of based on the method for the lightning arrester of fft algorithm with the how identical survey device of transformer as described in claim 1-9, is characterized in that: comprise the steps:
Step one: the Leakage Current of A phase, B phase, C phase and N phase enters zinc paste MOV leakage of current loop, leakage total current, the leakage total current in mutual inductor acquisition zinc paste MOV leakage of current loop enter current-to-voltage converting circuit through the coupling of mutual inductor in the mode of electric current;
Step 2: electric current is converted to voltage by I/V change-over circuit, then voltage is sent to filter unit, filtering interference signals, then enters the AD sample port being input to analysis and Control module after amplification is wherein amplified;
Step 3: optical coupling isolation circuit obtains the voltage of a coupled phase as the reference voltage, Zero-cross comparator circuit obtains the AD analog sampling module of output low level triggering analysis control module inside after reference voltage, and AD analog sampling module is according to the total current point of the second-phase in sample frequency continuous sampling A, B, C three-phase;
Step 4: the total current of gained point is carried out Fourier transform by analysis and Control module, obtain the amplitude of current first harmonics, then the best magnification of analysis and Control module resonance-amplifier, the phase angle of current first harmonics signal is drawn according to the total current after Fourier transform, according to the phase order relation between three-phase electricity, phasing degree increases by 120 ° successively, the then angle a of this phasing degree namely between this phase total current with this phase current in resistance property, according to sciagraphy, the cosine value that the total current of this phase is multiplied by angle a is the current in resistance property of this phase, Fourier transform is carried out to this current in resistance property and obtains third harmonic, return step, calculate the total current of third phase, current in resistance property and third harmonic.
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