CN204389583U - A kind of grounding net of transformer substation three-dimensional digital monitoring data collector - Google Patents
A kind of grounding net of transformer substation three-dimensional digital monitoring data collector Download PDFInfo
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- CN204389583U CN204389583U CN201520123404.XU CN201520123404U CN204389583U CN 204389583 U CN204389583 U CN 204389583U CN 201520123404 U CN201520123404 U CN 201520123404U CN 204389583 U CN204389583 U CN 204389583U
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Abstract
The utility model discloses a kind of grounding net of transformer substation three-dimensional digital monitoring data collector, comprise microcontroller, adjustable DC constant current source, current channel change-over switch module, hyperchannel connector socket, voltage channel change-over switch module, signal processing module, data memory module and wireless communication module, the size of current that the utility model is exported by microprocessor controls, D/A module again by carrying exports analog voltage signal and enters adjustable DC constant current source, to ensure the current precision injecting grounded screen, measure the voltage on corresponding branch road, utilize current channel change-over switch module, the voltage signal of acquisition is stored data by file system by hyperchannel connector socket and voltage channel change-over switch module, be stored in SD card, not only can effective buffered data, so that with host computer radio communication transmitting data again, and can directly read data in storage card, to meet the actual demand of different user.
Description
Technical field
The utility model relates to grounding net of transformer substation fault detection technique field, particularly relates to a kind of grounding net of transformer substation three-dimensional digital monitoring data collector.
Background technology
The safety and stablization that grounding net of transformer substation corrosion condition is directly connected to various electrical equipment and facility are run, and grounding apparatus needs Low ESR approach to keep the electrical connection with the earth.Traditional grounded screen monitoring device is only by injecting big current to grounded screen, electric current can reach dozens or even hundreds of peace, but because grounded screen itself has good electric conductivity, resistance is smaller, the measuring accuracy of traditional pick-up unit often can not meet the demands, and the corrosion condition analysis for grounded screen exists serious error and judges.Simultaneously because electric current is larger, require very high for the capacity of self of device and insulating property, cause the volume ratio of whole equipment huger and higher to power supply capacity requirement, be unfavorable for the grounded screen detection experiment of open air.For operating personnel, must operate in strict accordance with code, careless slightlyly very easily electric shock accidents occur.Simultaneously because grounded screen surface conditions is often relatively more severe, legacy equipment is difficult to run to scene.
Carrying out in analyzing and processing to data, legacy equipment is just confined to measure N group voltage data, the relation of electric current and voltage is only utilized to calculate stake resistance size, data message amount very little, result of calculation has very big error, and existing grounded screen is not carried out to digitized categorization, is therefore difficult to make life appraisal comparatively accurately.
Utility model content
The purpose of this utility model is to provide a kind of grounding net of transformer substation three-dimensional digital monitoring data collector, accurately can gather the magnitude of voltage of each branch road of grounding net of transformer substation, for the three-dimensional digital monitoring in later stage provides force data; Digital measuring archives can also be set up, the long-term follow of the ground net state that achieves a butt joint for each detected grounded screen.
The technical solution adopted in the utility model is:
A kind of grounding net of transformer substation three-dimensional digital supervising device, comprise microcontroller, adjustable DC constant current source, current channel change-over switch module, hyperchannel connector socket, voltage channel change-over switch module, signal processing module, data memory module and wireless communication module, microcontroller exports the electric current of different size by the Digital Signals adjustable DC constant current source that the D/A converting unit of self peripheral hardware exports, the current output terminal of adjustable DC constant current source is connected on the pulse current injectingt passage bridge switch of current channel change-over switch module, the current output terminal of current channel change-over switch module is connected on the pulse current injectingt interface of hyperchannel connector socket, the current output terminal of hyperchannel connector socket is for connecting the node of tested grounded screen, the current output interface of hyperchannel connector socket is connected in voltage channel change-over switch module, current channel change-over switch module is all connected microprocessor-based control end with the controlled end of voltage channel change-over switch module, current channel change-over switch module and voltage channel change-over switch module cut-off all by microprocessor controls, the signal input part of the voltage output end connection signal processing module of voltage channel change-over switch module, the signal output part of signal processing module connects the signal input part of microcontroller, the data input pin of the first signal output part connection data memory module of microcontroller, the secondary signal output terminal of microcontroller connects host computer by wireless communication module.
Described adjustable DC constant current source comprise to the constant voltage signal produced export carry out filtering filtering circuit, for eliminate each chip power supply power supply in circuit to export DC constant current power supply interference subtraction circuit, for increasing export DC constant current power supply stability voltage feedback circuit, for finally produce the precision resistance of DC constant current power supply electric current, operational amplifier, the power supply that each chip is powered and for DC constant current power supply calibration with the inspection leakage resistance guaranteeing DC constant current power supply stability; The inverting input of described subtraction circuit connects the digital signal output end of microcontroller by filtering circuit, microcontroller is for generation of a constant voltage signal and adjusted by the output of feedback signal to constant voltage signal, the in-phase input end of subtraction circuit connects the positive power pin to each chip power supply power supply, and the output terminal of subtraction circuit connects the inverting input of voltage feedback circuit; Precision resistance one end connects the in-phase input end of voltage feedback circuit, the other end of precision resistance connects positive power pin to each chip power supply power supply and inspection leakage resistance one end simultaneously, and the other end of inspection leakage resistance exports I/O pin by operational amplifier and microcontroller one and is connected.
Described current channel change-over switch module comprises pulse current injectingt passage bridge control module, multichannel analog switch, multichannel triode array and multicircuit relay array, multichannel analog switch, multichannel triode array and multicircuit relay array are all connected the control end of microcontroller by pulse current injectingt passage bridge control module, the pulse current injectingt end of each analog switch in multichannel analog switch all connects the current output terminal of adjustable DC constant current source, the output terminal of each analog switch is connected respectively the base stage of the corresponding triode in multichannel triode array, the collector of each triode is connected respectively the control end of the corresponding relay in multicircuit relay array, the output terminal of each relay is connected on the pulse current injectingt interface of hyperchannel connector socket.
The composition components and parts of described voltage channel change-over switch module and the identical of current channel change-over switch module, and the annexation of annexation and current channel change-over switch module is symmetrical.
Described signal processing module comprises voltage isolation circuit, low-pass filter circuit and A/D change-over circuit, the signal input part of voltage isolation circuit is connected in voltage channel change-over switch module, the signal output part of voltage isolation circuit connects the signal input part of the signal output part connection low-pass filter circuit of voltage isolation circuit, and the signal output part of low-pass filter circuit connects microprocessor by A/D change-over circuit.
Described data memory module adopts SD card memory.
Described microcontroller adopts ARM single-chip microcomputer, and microprocessor also connects display screen and button.
The size of current that the utility model is exported by microprocessor controls, D/A module again by carrying exports analog voltage signal and enters adjustable DC constant current source, to ensure the current precision injecting grounded screen, measure the voltage on corresponding branch road, utilize current channel change-over switch module, the voltage signal of acquisition is stored data by file system by hyperchannel connector socket and voltage channel change-over switch module, be stored in SD card, not only can effective buffered data, so that with host computer radio communication transmitting data again, and can directly read data in storage card, to meet the actual demand of different user.
Accompanying drawing explanation
Fig. 1 is schematic block circuit diagram of the present utility model;
Fig. 2 is adjustable DC constant-current source circuit theory diagram of the present utility model;
Fig. 3 is the annexation block diagram of current channel change-over switch module of the present utility model, hyperchannel connector socket and voltage channel change-over switch module.
Embodiment
As shown in Figure 1,2 and 3, the utility model comprises microcontroller, adjustable DC constant current source, current channel change-over switch module, hyperchannel connector socket, voltage channel change-over switch module, signal processing module, data memory module and wireless communication module, and microcontroller exports the electric current of different size by the Digital Signals adjustable DC constant current source that the D/A converting unit of self peripheral hardware exports, the current output terminal of adjustable DC constant current source is connected on the pulse current injectingt passage bridge switch of current channel change-over switch module, the current output terminal of current channel change-over switch module is connected on the pulse current injectingt interface of hyperchannel connector socket, the current output terminal of hyperchannel connector socket is for connecting the node of tested grounded screen, the current output interface of hyperchannel connector socket is connected in voltage channel change-over switch module, current channel change-over switch module is all connected microprocessor-based control end with the controlled end of voltage channel change-over switch module, current channel change-over switch module and voltage channel change-over switch module cut-off all by microprocessor controls, the signal input part of the voltage output end connection signal processing module of voltage channel change-over switch module, the signal output part of signal processing module connects the signal input part of microcontroller, the data input pin of the first signal output part connection data memory module of microcontroller, the secondary signal output terminal of microcontroller connects host computer by wireless communication module, and host computer is for carrying out the state estimation of three-dimensional imaging and grounded screen.
Described adjustable DC constant current source comprise to the constant voltage signal produced export carry out filtering filtering circuit, for eliminate each chip power supply power supply in circuit to export DC constant current power supply interference subtraction circuit, for increasing export DC constant current power supply stability voltage feedback circuit, for finally produce the precision resistance of DC constant current power supply electric current, operational amplifier, the power supply that each chip is powered and for DC constant current power supply calibration with the inspection leakage resistance guaranteeing DC constant current power supply stability; The inverting input of described subtraction circuit connects the digital signal output end of microcontroller by filtering circuit, microcontroller is for generation of a constant voltage signal and adjusted by the output of feedback signal to constant voltage signal, the in-phase input end of subtraction circuit connects the positive power pin to each chip power supply power supply, and the output terminal of subtraction circuit connects the inverting input of voltage feedback circuit; Precision resistance one end connects the in-phase input end of voltage feedback circuit, the other end of precision resistance connects positive power pin to each chip power supply power supply and inspection leakage resistance one end simultaneously, and the other end of inspection leakage resistance exports I/O pin by operational amplifier and microcontroller one and is connected.
Microcontroller adopts ARM single-chip microcomputer, has programmable functions.Microprocessor also connects display screen and button.By the generation of the programming realization DC constant current power supply to microcontroller; Because the DC constant voltage produced by microcontroller programming has good stability, so consequent DC constant current power supply also has good stability.
The second-order low-pass filter circuit of described filtering circuit to be cutoff frequency be 10Hz.The yield value of described subtraction circuit is 1.Filtering circuit, in order to eliminate power supply disturbance, ensures can not zooming in or out of signal.And the in-phase input end of voltage feedback circuit is equal with inverting input input voltage, so the voltage at precision resistance two ends is the constant voltage that microcontroller programming produces.Described precision resistance is high-precision power resistance, and resistance is 1 Ω ~ 0.5 Ω.The voltage exported due to microcontroller is less, so resistance needs to choose corresponding less resistance.
The resistance of described inspection leakage resistance is 0.1 Ω, and Voltage Feedback to the microcontroller at its two ends carries out DC constant current power supply electric current and exports calibration.
Based on the adjustable DC constant current source production method of microcontroller, comprise following step:
A: make microcontroller I/O port produce and export a constant voltage signal by programming, and obtain the constant voltage signal of a single-frequency after this constant voltage signal is delivered to filtering circuit process;
B: the inverting input constant voltage signal of single-frequency after process being after filtering delivered to subtraction circuit, the in-phase input end of subtraction circuit connects the positive supply power pin of each chip, eliminates each chip power supply power supply to the disturbing effect of DC constant current power supply by subtraction circuit;
C: the difference of constant voltage signal positive supply and microcontroller exported by the output terminal of subtraction circuit outputs to the inverting input of voltage feedback circuit; Because the reverse input end of voltage feedback circuit is equal with in-phase input end voltage, be equivalent to the one end of above-mentioned difference being received precision resistance, the other end of precision resistance connects positive supply, so just, the constant voltage signal Indirect Loaded making microprocessor controls export, on precision resistance, produces direct current constant current signal by Ohm law on precision resistance;
D: first inspection leakage resistance is converted into inspection pressure constant voltage signal by precision resistance producing direct current constant current signal, then by operational amplifier this inspection pressure constant voltage signal is amplified to that to export constant voltage signal with the microcontroller setting generation equal, then presses constant voltage signal to feed back to microcontroller the inspection after amplifying;
E: the numerical value of the constant voltage signal that the microcontroller of microcontroller to the inspection pressure constant voltage signal after the amplification that feeds back to of inspection leakage resistance and generation exports is made comparisons, if the two equal and opposite in direction, then microcontroller exports the constant constant pressure source electric current of size always; If the two size is unequal, microcontroller carries out according to the two size adjusting the size exporting constant pressure source current value, until the two is equal, gets final product the direct current constant electric current of stable output.
Microcontroller passes through the generation of programming realization DC constant current power supply, because the DC constant voltage produced by microcontroller programming has good stability, so consequent DC constant current power supply also has good stability.Microcontroller exports for generation constant voltage signal of programming, the constant voltage signal that filtering circuit is used for producing carries out filtering process, subtraction circuit is for eliminating the impact of power supply on output constant current source, and the difference of power supply and constant voltage signal is outputted to voltage feedback circuit, voltage feedback circuit is for increasing the output stability of DC constant current power supply, the constant voltage signal that microcontroller produces is loaded into precision resistance two ends indirectly simultaneously, and then generation DC constant current power supply, DC constant current power supply flows through inspection leakage resistance and produces a feedback inspection stream voltage before output, and this inspection stream voltage fed back is sent into microcontroller, microcontroller adjusts its constant voltage signal size exported by the size detecting this inspection stream voltage, thus the adjustable DC constant current power supply of amplitude size can be produced, the output stability of further guarantee DC constant current power supply.
Described current channel change-over switch module comprises pulse current injectingt passage bridge control module, multichannel analog switch, multichannel triode array and multicircuit relay array, multichannel analog switch, multichannel triode array and multicircuit relay array are all connected the control end of microcontroller by pulse current injectingt passage bridge control module, the pulse current injectingt end of each analog switch in multichannel analog switch all connects the current output terminal of adjustable DC constant current source, the output terminal of each analog switch is connected respectively the base stage of the corresponding triode in multichannel triode array, the collector of each triode is connected respectively the control end of the corresponding relay in multicircuit relay array, the output terminal of each relay is connected on the pulse current injectingt interface of hyperchannel connector socket.The composition components and parts of voltage channel change-over switch module and the identical of current channel change-over switch module, and the annexation of annexation and current channel change-over switch module is symmetrical.When needing the unlatching of control channel or closing, only need microprocessor to write respectively to the address wire of analog switch injection and the outflow that different signal values just can control electric current, facilitate numerically controlled realization.Above-mentioned multichannel analog switch, multichannel triode array and multicircuit relay array all adopt 16 components and parts, thus composition 16 paths.
Described signal processing module voltage isolation circuit, low-pass filter circuit and A/D change-over circuit, the signal input part of voltage isolation circuit is connected in voltage channel change-over switch module, the signal output part of voltage isolation circuit connects the signal input part of the signal output part connection low-pass filter circuit of voltage isolation circuit, and the signal output part of low-pass filter circuit connects microprocessor by A/D change-over circuit.Voltage isolation circuit is a voltage follower, the voltage signal receiving and produce in grounded screen from the Injection Current on 16 channel wiring sockets followed the tracks of by follower, the voltage signal of input is isolated and impedance matching with the voltage signal exporting to low-pass filter, various high frequency component signal interference in low-pass filter circuit filtering grounded screen, and by signal transmission to A/D converter, A/D converter by conversion digital signal transfers to microcontroller.
Described data memory module adopts SD card memory, be made up of the SDIO circuit module of STM32 and outside SD card circuit, microcontroller by the peripheral hardware SDIO interface that carries to storage voltage data in SD storage card, and in external memory card, build FATFAS file system, the storage format of data is txt, to realize facilitating data longer-term storage and reading.
Described wireless communication module is connected to form radio transmitter by the peripheral hardware USART interface of microcontroller and wireless chip SX1212, and the SX1212 on host computer is configured to receiving circuit.Realize SD card data by the communication speed of configuration transmission circuit coupling to store in host computer storage card, storage format is Excel or txt.
The course of work of whole device described in the utility model is that tester arranges the size of current that will inject by button, microcontroller exports analog voltage signal by the D/A module carried and enters adjustable DC constant current source, signal carries out filtering process to eliminate D/A module outputting analog signal high frequency components signal, enter subtraction circuit to eliminate the interference of chip to output current signal of front-end filtering circuitry and rear end feedback circuit, feedback circuit is entered for realizing stable output signal signal out from subtraction circuit, the signal of the dynamic stability produced enters the electric current of constant current output circuit constant output current, and injected to grounded screen by hyperchannel connector socket, grounded screen is because having flowed through electric current, so produce corresponding voltage.Microcontroller is cut-off by control voltage handover module, select the voltage of corresponding earth point in grounded screen, and this voltage signal is sent in signal processing circuit, first voltage signal enters voltage isolation circuit to realize the isolation of constrained input, the output resistance of buffer circuit is larger, output signal sends filtering circuit to and can realize fine coupling, low-pass filter circuit is by the high fdrequency component filtering in grounded screen neutralizing circuit, voltage signal enters and converts digital signal in high-precision A/D converter and give microcontroller, the voltage collected to be established to circuit by peripheral module SDIO in the SD card of FATFAS file system and carries out storage voltage data with txt form by microcontroller, start wireless communicated data pattern by button and transmission is set and consider carefully, storage data in SD card send the wireless chip SX1212 that the peripheral hardware USART interface successively by microcontroller connects to host computer wireless receiving chip SX1212, the voltage data of acquisition carries out with Excel form storing the storage realizing signal by host computer.
Claims (7)
1. a grounding net of transformer substation three-dimensional digital monitoring data collector, it is characterized in that: comprise microcontroller, adjustable DC constant current source, current channel change-over switch module, hyperchannel connector socket, voltage channel change-over switch module, signal processing module, data memory module and wireless communication module, microcontroller exports the electric current of different size by the Digital Signals adjustable DC constant current source that the D/A converting unit of self peripheral hardware exports, the current output terminal of adjustable DC constant current source is connected on the pulse current injectingt passage bridge switch of current channel change-over switch module, the current output terminal of current channel change-over switch module is connected on the pulse current injectingt interface of hyperchannel connector socket, the current output terminal of hyperchannel connector socket is for connecting the node of tested grounded screen, the current output interface of hyperchannel connector socket is connected in voltage channel change-over switch module, current channel change-over switch module is all connected microprocessor-based control end with the controlled end of voltage channel change-over switch module, current channel change-over switch module and voltage channel change-over switch module cut-off all by microprocessor controls, the signal input part of the voltage output end connection signal processing module of voltage channel change-over switch module, the signal output part of signal processing module connects the signal input part of microcontroller, the data input pin of the first signal output part connection data memory module of microcontroller, the secondary signal output terminal of microcontroller connects wireless communication module, and wireless communication module is for connecting host computer.
2. grounding net of transformer substation three-dimensional digital monitoring data collector according to claim 1, it is characterized in that: described adjustable DC constant current source comprises the filtering circuit constant voltage signal output produced being carried out to filtering, for eliminating the subtraction circuit that in circuit, each chip power supply power supply disturbs output DC constant current power supply, for increasing the voltage feedback circuit exporting DC constant current power supply stability, for finally producing the precision resistance of DC constant current power supply electric current, operational amplifier, the power supply that each chip is powered and for DC constant current power supply calibration with the inspection leakage resistance guaranteeing DC constant current power supply stability, the inverting input of described subtraction circuit connects the digital signal output end of microcontroller by filtering circuit, microcontroller is for generation of a constant voltage signal and adjusted by the output of feedback signal to constant voltage signal, the in-phase input end of subtraction circuit connects the positive power pin to each chip power supply power supply, and the output terminal of subtraction circuit connects the inverting input of voltage feedback circuit, precision resistance one end connects the in-phase input end of voltage feedback circuit, the other end of precision resistance connects positive power pin to each chip power supply power supply and inspection leakage resistance one end simultaneously, and the other end of inspection leakage resistance exports I/O pin by operational amplifier and microcontroller one and is connected.
3. grounding net of transformer substation three-dimensional digital monitoring data collector according to claim 2, it is characterized in that: described current channel change-over switch module comprises pulse current injectingt passage bridge control module, multichannel analog switch, multichannel triode array and multicircuit relay array, multichannel analog switch, multichannel triode array and multicircuit relay array are all connected the control end of microcontroller by pulse current injectingt passage bridge control module, the pulse current injectingt end of each analog switch in multichannel analog switch all connects the current output terminal of adjustable DC constant current source, the output terminal of each analog switch is connected respectively the base stage of the corresponding triode in multichannel triode array, the collector of each triode is connected respectively the control end of the corresponding relay in multicircuit relay array, the output terminal of each relay is connected on the pulse current injectingt interface of hyperchannel connector socket.
4. grounding net of transformer substation three-dimensional digital monitoring data collector according to claim 3, it is characterized in that: the composition components and parts of described voltage channel change-over switch module and the identical of current channel change-over switch module, and the annexation of annexation and current channel change-over switch module is symmetrical.
5. grounding net of transformer substation three-dimensional digital monitoring data collector according to claim 4, it is characterized in that: described signal processing module comprises voltage isolation circuit, low-pass filter circuit and A/D change-over circuit, the signal input part of voltage isolation circuit is connected in voltage channel change-over switch module, the signal output part of voltage isolation circuit connects the signal input part of the signal output part connection low-pass filter circuit of voltage isolation circuit, and the signal output part of low-pass filter circuit connects microprocessor by A/D change-over circuit.
6. grounding net of transformer substation three-dimensional digital monitoring data collector according to claim 5, is characterized in that: described data memory module adopts SD card memory.
7. grounding net of transformer substation three-dimensional digital monitoring data collector according to claim 6, is characterized in that: described microcontroller adopts ARM single-chip microcomputer, and microprocessor also connects display screen and button.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104777400A (en) * | 2015-03-03 | 2015-07-15 | 国网河南省电力公司电力科学研究院 | Three-dimensional digitalized monitoring device for substation grounding grid and evaluation method |
| CN106324319A (en) * | 2016-08-02 | 2017-01-11 | 许继集团有限公司 | Direct current voltage and direct current signal sampling circuit |
| CN112363229A (en) * | 2020-11-13 | 2021-02-12 | 中国海洋大学 | High-density electrode switching access method and system based on FPGA and analog switch |
| CN113238497A (en) * | 2021-04-26 | 2021-08-10 | 核星核电科技(海盐)有限公司 | Small-size portable reactivity appearance based on microcontroller |
| CN115268558A (en) * | 2022-08-22 | 2022-11-01 | 苏州智而卓数字科技有限公司 | Voltage and current universal output interface circuit |
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2015
- 2015-03-03 CN CN201520123404.XU patent/CN204389583U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104777400A (en) * | 2015-03-03 | 2015-07-15 | 国网河南省电力公司电力科学研究院 | Three-dimensional digitalized monitoring device for substation grounding grid and evaluation method |
| CN106324319A (en) * | 2016-08-02 | 2017-01-11 | 许继集团有限公司 | Direct current voltage and direct current signal sampling circuit |
| CN112363229A (en) * | 2020-11-13 | 2021-02-12 | 中国海洋大学 | High-density electrode switching access method and system based on FPGA and analog switch |
| CN113238497A (en) * | 2021-04-26 | 2021-08-10 | 核星核电科技(海盐)有限公司 | Small-size portable reactivity appearance based on microcontroller |
| CN115268558A (en) * | 2022-08-22 | 2022-11-01 | 苏州智而卓数字科技有限公司 | Voltage and current universal output interface circuit |
| CN115268558B (en) * | 2022-08-22 | 2024-03-22 | 苏州智而卓数字科技有限公司 | Universal output interface circuit for voltage and current |
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