CN208224192U - A kind of SF6 on-line monitoring sensor signal processing circuit - Google Patents
A kind of SF6 on-line monitoring sensor signal processing circuit Download PDFInfo
- Publication number
- CN208224192U CN208224192U CN201820358987.8U CN201820358987U CN208224192U CN 208224192 U CN208224192 U CN 208224192U CN 201820358987 U CN201820358987 U CN 201820358987U CN 208224192 U CN208224192 U CN 208224192U
- Authority
- CN
- China
- Prior art keywords
- signal
- circuit
- processing circuit
- microprocessor
- signal processing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
The utility model discloses a kind of SF6 to monitor sensor signal processing circuit on-line, the circuit includes a signal conditioning circuit, the signal conditioning circuit is connected with temperature sensor, pressure sensor and temperature sensor respectively, the effect of signal conditioning circuit is to carry out improving the sensor signal of acquisition and dialing is converted to voltage signal, signal conditioning circuit is connected by A/D sampling A/D chip with microprocessor, and the microprocessor is connected by communication module with monitoring system.The utility model is by optimization design integrated circuit structure, selection electronic chip and component, to promote SF6 signal processing circuit accuracy, stability, anti-interference ability, reduces SF6 monitoring device rate of breakdown.
Description
Technical field
The utility model relates to a kind of signal processing circuit more particularly to a kind of SF6 on-line monitoring sensor signal processing
Circuit.
Background technique
SF6 (sulfur hexafluoride) has good insulation performance and arc extinction performance, is widely used in high-voltage electrical apparatus at this stage and sets
It is ideal insulation and arc-extinguishing medium in normal conditions in standby.Influence the key of SF6 gas-insulated and arc extinction performance
It is the height of moisture content and gas density in its working gas, if moisture content is exceeded in SF6 gas or leakage causes
Density decline, high voltage electric equipment there is security risk and even result in accident.Therefore to gas in SF6 high voltage electric equipment
The monitoring of body moisture content and gas density is always the composition important component of power industry safety.
In order to monitor the moisture content and gas density of SF6 gas in high-tension electricity equipment, currently known means are to adopt
The acquisition and working process of data are realized with the mode of humidity, pressure, temperature sensor connection circuit.By to having thrown on the market
It is found after entering the equipment performance index investigation of production run, circuit data processing common problem has: 1, measurement accuracy is not
It is high；2, circuit level is lower；3, stability, anti-interference ability are weak；4, Electro Magnetic Compatibility is poor.Problem above increases monitoring
Sensor fault incidence needs to be resolved.
Utility model content
The purpose of this utility model is to provide a kind of SF6 to monitor sensor signal processing circuit on-line, solves existing skill
Shortcoming existing for art.
The utility model adopts the following technical solution realizes:
A kind of SF6 on-line monitoring sensor signal processing circuit, which is characterized in that the circuit includes a signal condition electricity
Road, the signal conditioning circuit are connected with temperature sensor, pressure sensor and temperature sensor respectively, signal conditioning circuit
Effect is to carry out improving the sensor signal of acquisition and dialing is converted to voltage signal, and signal conditioning circuit is adopted by A/D
Sample chip is connected with microprocessor, and the microprocessor is connected by communication module with monitoring system.
It further, further include an isolated power supply, the isolated power supply samples core with signal conditioning circuit, A/D respectively
Piece, microprocessor are connected with communication module.
Further, the microprocessor is connected with digital filtering processing circuit.
Further, the A/D sampling A/D chip is connected with power reference source.
The utility model converts the indoor moisture of SF6 gas, pressure, temperature parameters by humidity, pressure, temperature sensor
Corresponding high-frequency interferencing signal is filtered out, normalization circuit is passed through then by normalization filtering processing circuit for corresponding electric signal
All signals are converted to a certain range of voltage signal to facilitate identification, then with high-precision A/D sampling A/D chip simulation
Voltage signal is converted to digital quantity signal, then digital signal is transferred in CPU, calculates and obtains corresponding parameter, obtains actual
The signals such as temperature, pressure, moisture go out the parameters such as density, dew point, ppm, the alarm condition of SF6 gas chamber further according to Parameters Calculation.?
It is packaged to after all parameters, then obtained all parameter normalizations, monitoring system is transferred to by RS485 or CAN bus.
In order to obtain higher precision, the utility model uses modulus isolation technics, analog reference voltage, pressure acquisition list is separately provided
Member uses constant current source power supply technology, the voltage source model ADR440 of pressure sensor, be a low drifting, high initial precision,
Low noise reference voltage source, this power supply is not influenced by ambient temperature, prevents the variation because of temperature from influencing the stability of circuit, simultaneously
It ensure that the stability of pressure sensor output.Moisture acquisition unit uses special frequency channel filtering technique, the letter that acquisition is entered
It number is handled by FFT digital filtering technique, specifically for the complex electromagnetic environment of substation, filters out high frequency, the power frequency of substation
It is interfered caused by magnetic field etc., to obtain true low-frequency range voltage signal.Institute is calculated by constantly acquiring, then by CPU
The pressure wanted, temperature, moisture signal.It places the data into transmission packet, master system is waited to send when needing.
The advantageous effects of the utility model are: passing through optimization design integrated circuit structure, selection electronic chip and member
Device reduces SF6 monitoring device failure and occurs to promote SF6 signal processing circuit accuracy, stability, anti-interference ability
Rate.
Detailed description of the invention
Fig. 1 is the schematic block circuit diagram of the utility model.
Specific embodiment
By the following description of the embodiment, public understanding the utility model will more be facilitated, but can't should
Specific embodiment given by applicant is considered as the limitation to technical solutions of the utility model, any pair of component or technology are special
The definition of sign be changed and/or to overall structure make form and immaterial convert the technology of the utility model of being regarded as
Protection scope defined by scheme.
SF6 as shown in Figure 1 monitors sensor signal processing circuit on-line, which includes a signal conditioning circuit,
Signal conditioning circuit is connected with temperature sensor, pressure sensor and temperature sensor respectively, and the effect of signal conditioning circuit is
The sensor signal of acquisition is subjected to conditioning and dialing is converted into voltage signal, signal conditioning circuit passes through A/D sampling A/D chip
It is connected with microprocessor, it further includes an isolated power supply in circuit that microprocessor, which is connected by communication module with monitoring system, every
It is connected respectively with signal conditioning circuit, A/D sampling A/D chip, microprocessor and communication module from power supply, microprocessor and number are filtered
Wave processing circuit is connected, and A/D sampling A/D chip is connected with power reference source.
In the present embodiment, signal processing circuit includes the signal conditioning circuit being sequentially connected, A/D sampling A/D chip, Wei Chu
Device, RS485 or CAN communication module, and the digital filtering processing circuit being connected with the microprocessor are managed, and is distinguished with isolated power supply
Power supply is provided for it, the indoor moisture of SF6 gas, pressure, temperature parameters are converted to corresponding electricity by humidity, pressure, temperature sensor
Signal improves the sensor signal of acquisition, is then converted to all signals centainly then by signal conditioning circuit
The voltage signal of range, to facilitate identification.Then analog voltage signal is converted to digital quantity with high-precision A/D sampling A/D chip
Signal, then digital signal is transferred in microprocessor, it calculates and obtains corresponding parameter, obtain actual temperature, pressure, moisture etc.
Signal goes out the parameters such as density, dew point, ppm, the alarm condition of SF6 gas chamber further according to Parameters Calculation, after obtaining all parameters, then
Obtained all parameters by normalization, it is packaged, by RS485 or CAN communication module transfer to monitoring system；This is practical
Novel moisture content acquisition unit samples special frequency channel filtering technique, and the signal for the microprocessor that acquisition is entered passes through FFT software number
Circuit is filtered in word, specifically for the complex electromagnetic environment of substation, caused by filtering out high frequency, power frequency magnetic field of substation etc.
Interference, to obtain true low-frequency range voltage signal.
The utility model pressure acquisition unit uses constant current source power supply technology, the power supply model of pressure sensor
ADR440, this power supply is not influenced by ambient temperature, prevents the variation because of temperature from influencing the stability of circuit, while ensure that pressure
The stability of sensor output；And analog reference voltage technology is separately provided in the utility model, A/D sampling A/D chip passes through high-precision
The pressure stabilizing of voltage refers to, and forms voltage-reference, all signals into A/D sampling A/D chip are sampled one by one, are converted to
The digital signal that microprocessor can identify is passed digital signal in a manner of synchronous serial communication then by control bus
It is defeated by microprocessor.
In signal processing circuit include pressure sensor signal condition, amplification, filter circuit, including humidity sensor and
The signal condition and filter circuit of temperature sensor.All above-mentioned signals output voltage signal after conditioning, is adopted into A/D
Sample circuit, A/D sampling A/D chip are referred to by the pressure stabilizing of high-accuracy voltage, all signals into A/D sampling A/D chip are adopted one by one
Sample is come in, and the digital signal that microprocessor can identify is converted to, then by control bus, digital signal with synchronous serial
The mode of communication is transferred to microprocessor, and software FFT filtering is first passed through in microprocessor CPU, filters out unwanted signal,
It obtains stablizing true data, the parameters such as temperature, pressure, moisture for obtaining according still further to corresponding algorithm, be calculated by mathematical model
Method obtains the parameters such as density, PPM, dew point, these parameters are packed by the data format set in advance respectively, recomposition data packet
Mode, data are transferred to host computer with RS485 or CAN module.
Certainly, the utility model can also have other various embodiments, without departing substantially from the spirit of the present invention and its essence
In the case where, those skilled in the art can make various corresponding changes and modifications, but this according to the utility model
A little corresponding changes and modifications all should belong to the protection scope of the utility model the attached claims.
Claims (4)
1. a kind of SF6 monitors sensor signal processing circuit on-line, which is characterized in that the circuit includes a signal condition electricity
Road, the signal conditioning circuit are connected with temperature sensor, pressure sensor and temperature sensor respectively, signal conditioning circuit
Effect is to carry out improving the sensor signal of acquisition and dialing is converted to voltage signal, and signal conditioning circuit is adopted by A/D
Sample chip is connected with microprocessor, and the microprocessor is connected by communication module with monitoring system.
2. SF6 according to claim 1 monitors sensor signal processing circuit on-line, which is characterized in that further include one
Isolated power supply, the isolated power supply are connected with signal conditioning circuit, A/D sampling A/D chip, microprocessor and communication module respectively.
3. SF6 according to claim 1 monitors sensor signal processing circuit on-line, which is characterized in that the micro process
Device is connected with digital filtering processing circuit.
4. SF6 according to claim 1 monitors sensor signal processing circuit on-line, which is characterized in that the A/D sampling
Chip is connected with power reference source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820358987.8U CN208224192U (en) | 2018-03-15 | 2018-03-15 | A kind of SF6 on-line monitoring sensor signal processing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820358987.8U CN208224192U (en) | 2018-03-15 | 2018-03-15 | A kind of SF6 on-line monitoring sensor signal processing circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208224192U true CN208224192U (en) | 2018-12-11 |
Family
ID=64531670
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820358987.8U Active CN208224192U (en) | 2018-03-15 | 2018-03-15 | A kind of SF6 on-line monitoring sensor signal processing circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208224192U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111650341A (en) * | 2020-06-19 | 2020-09-11 | 清华大学 | Online monitoring system for gas-phase pollutants of drainage pipe network |
| CN111966115A (en) * | 2020-08-14 | 2020-11-20 | 南京工程学院 | STM 32-based control circuit and control method of cabled underwater robot |
| CN113916281A (en) * | 2021-09-06 | 2022-01-11 | 广东电网有限责任公司广州供电局 | Distribution room monitoring method and system |
-
2018
- 2018-03-15 CN CN201820358987.8U patent/CN208224192U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111650341A (en) * | 2020-06-19 | 2020-09-11 | 清华大学 | Online monitoring system for gas-phase pollutants of drainage pipe network |
| CN111966115A (en) * | 2020-08-14 | 2020-11-20 | 南京工程学院 | STM 32-based control circuit and control method of cabled underwater robot |
| CN113916281A (en) * | 2021-09-06 | 2022-01-11 | 广东电网有限责任公司广州供电局 | Distribution room monitoring method and system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN208224192U (en) | A kind of SF6 on-line monitoring sensor signal processing circuit | |
| CN201936442U (en) | On-line monitoring system for capacitance voltage transformer | |
| CN210346899U (en) | Mechanical vibration abnormal state detection device for gas insulated metal enclosed switchgear | |
| CN203133246U (en) | On-line switch monitoring device | |
| CN108459295A (en) | CVT on-line monitoring systems and method based on distributed data acquisition processing | |
| CN201681115U (en) | Current sensor used for grounding current detection of transmission poles and towers | |
| CN111044792A (en) | High-voltage cable dielectric loss live detection system and method | |
| CN201903491U (en) | Micro-water density online monitoring instrument for high-voltage electric power equipment | |
| CN115542018A (en) | On-line monitoring method and device for dielectric loss and capacitance of high-voltage bushing | |
| CN105278592A (en) | Intelligent transformer substation state networked monitoring system | |
| CN105223422A (en) | Digital dielectric loss measurement system device and method | |
| CN208969162U (en) | A kind of detection circuit of voltage differential sample circuit parameter | |
| CN104266581A (en) | Wind deflection angle monitoring system of electric transmission line insulator string | |
| CN104391246A (en) | 12kV vacuum circuit breaker arc voltage testing device and method | |
| CN205246745U (en) | Electrified detecting instrument of portable arrester based on wireless synchronization technique | |
| Gao et al. | On Line Monitoring of Partial Discharge in High Voltage Cables. | |
| CN113671239B (en) | Intelligent overvoltage identification method, device and system for high-voltage switch PT cabinet | |
| CN204595129U (en) | A kind of split type on-line insulation monitoring equipment | |
| CN106908646B (en) | Portable arrester live detection instrument based on wireless synchronization technology | |
| CN105572489A (en) | Live-line tester for lightning arrester | |
| CN205210733U (en) | Intelligent substation state networking monitored control system | |
| CN202256510U (en) | On-line monitoring synchronous sampling system of capacitance equipment | |
| CN109239447A (en) | A kind of power distribution network transient overvoltage monitoring system | |
| CN116383602B (en) | GIS isolating switch mechanical defect identification method considering noise and sample size | |
| CN210639238U (en) | Device for high-voltage capacitive monitoring by simultaneously measuring voltage and current |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |