CN207993194U - A kind of power cable fire disaster intelligently prior-warning device - Google Patents
A kind of power cable fire disaster intelligently prior-warning device Download PDFInfo
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- CN207993194U CN207993194U CN201820397222.5U CN201820397222U CN207993194U CN 207993194 U CN207993194 U CN 207993194U CN 201820397222 U CN201820397222 U CN 201820397222U CN 207993194 U CN207993194 U CN 207993194U
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Abstract
The utility model discloses a kind of power cable fire disaster intelligently prior-warning devices, background management system including site measuring and control subsystem and based on SAE Cloud Servers, for the background management system based on SAE Cloud Servers by the multiple site measuring and control subsystems of wireless network connection, the site measuring and control subsystem includes the first MCU, alarm module, the 2nd MCU, temperature sensor and alarm module.The utility model power cable fire disaster intelligently prior-warning device circuit structure is simple, high system safety, data transmission strong interference immunity, can precise positioning sensing station, be convenient for equipment Fast-Maintenance the advantages that.
Description
Technical field
The utility model is related to a kind of monitoring system, specifically a kind of power cable fire disaster intelligently prior-warning device.
Background technology
Electric power is basis and the pillar of national economy, is the root for maintaining industry, the sustainable and stable development of economic normal operation
The safety and stability of this guarantee, electric system is related to national economy；With the development of urban construction, power cable is pacified with its power supply
It is complete reliably and the advantages that being conducive to urban beautification to be more and more widely used, therefore electric system is to cable run
The requirement of safe power supply and power supply reliability is increasingly stringenter.
Electricity consumption fire incident in industrial production is largely caused by transmission of electricity high-tension cable temperature is excessively high, by right
The continuous temperature measurement of end or cable itself can predict the fault trend of end or cable itself, implement to it in time
Protection, the power supply protection system of a safe and intelligent is built, to maintaining the sustainable and stable development of industry, economic normal operation to have
It is significant.
The way of traditional periodical power failure progress preventive trial has been unable to meet the requirement of power grid high reliability, and current
On the market using thermistor as the temperature detection of sensor, exist it is relatively low using thermosensitive resistance measurement temperature accuracy, reliably compared with
Difference, and have to pass through the interface circuits such as A/D conversions and be converted into just giving the defects of microprocessor is handled after digital signal,
The circuit structure for allowing for temperature measuring equipment in this way is more complex, reduces the security reliability of system.
The surface temperature of power cable reflects the operating condition of cable.Whether running overload or cable run ring
Border changes or cable run insulation fault itself, all cable surface temperature can be caused to change, therefore monitors electricity
Cable surface temperature can find cable abnormal conditions in time, take timely measure, so that it may effectively to avoid accident.
Utility model content
The purpose of this utility model is to provide a kind of power cable fire disaster intelligently prior-warning devices, to solve above-mentioned background skill
The problem of being proposed in art.
To achieve the above object, the utility model provides the following technical solutions：
A kind of power cable fire disaster intelligently prior-warning device, including site measuring and control subsystem and based on SAE Cloud Servers after
Platform manages system, and the background management system based on SAE Cloud Servers passes through the multiple site measuring and control subsystems of wireless network connection
System, the site measuring and control subsystem include the first MCU, alarm module, the 2nd MCU, temperature sensor and alarm module, first
MCU branches connect WIFI module, alarm module and relay control module, and the 2nd MCU branches connect touch display screen and temperature
Sensor is wirelessly connected between the first MCU and the 2nd MCU by LoRa modules.
Further technical solution as the utility model：The model DS18B20 of the temperature sensor.
Further technical solution as the utility model：The model SC1278 of the LoRa modules.
Further technical solution as the utility model：The model of first MCU and the 2nd MCU is STM32 systems
Row microcontroller.
Compared with prior art, the utility model has the beneficial effects that：The utility model power cable fire disaster intelligently early warning
Device circuit is simple in structure, high system safety, data transmission strong interference immunity, can precise positioning sensing station, convenient for setting
The advantages that standby Fast-Maintenance.
Description of the drawings
Fig. 1 is the overall schematic of the utility model.
Fig. 2 is site measuring and control subsystem block diagram.
Fig. 3 is field data convergence module entire block diagram,
Fig. 4 is extension set hardware system figure.
Fig. 5 is display screen menu schematic diagram.
Fig. 6 is the simulated effect figure of intelligent early-warning model.
Specific implementation mode
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
The every other embodiment obtained, shall fall within the protection scope of the present invention.
Please refer to Fig.1-6, a kind of power cable fire disaster intelligently prior-warning device, including site measuring and control subsystem and it is based on SAE
The background management system of Cloud Server, the background management system based on SAE Cloud Servers are multiple by wireless network connection
Site measuring and control subsystem, the site measuring and control subsystem include the first MCU, alarm module, the 2nd MCU, temperature sensor and report
Alert module, the first MCU branches connect WIFI module, alarm module and relay control module, and the connection of the 2nd MCU branches touches aobvious
Display screen and temperature sensor are wirelessly connected between the first MCU and the 2nd MCU by LoRa modules.
The model DS18B20 of temperature sensor.The model SC1278 of LoRa modules.The type of first MCU and the 2nd MCU
Number it is STM32 series monolithics.
The operation principle of the utility model is：Site measuring and control subsystem is by scene temperature acquisition module, field data convergence
The parts such as module, live host, intelligent control module, power supply module form.Site measuring and control subsystem is monitoring system
Important component needs to design a set of by the determination of the environmental factor and system monitoring signal that need to measure environment
Complete monitoring node circuit, this chapter describe the design of hardware and software of site measuring and control subsystem in detail.
(1) temperature collecting module based on DS18B20 sensors
Based on the working method of DS18B20 single bus, for cable for measuring temperature reality of work environment and to detection response speed
The demand of degree, designs cable for measuring temperature in the following way.
It is on the data line every connection ten on one meter of a piece of DS18B20 of connection, every data line, all measuring points are all close
Be encapsulated in inside data line, constitute cable for measuring temperature, while outside cable add shielded layer come solve more conducting wires it is parallel when interference
Problem.Several cable for measuring temperature can be used to constitute compact temperature data acquisition network for system, is connected in parallel in conjunction with single port and more
The connection feature of port parallel connection, each ports I/O connect 1 cable for measuring temperature, to realize DS18B20 in single cable for measuring temperature
On be connected in parallel for single port, and the effect that every cable for measuring temperature is multiport parallel connection.Using such connection type, in conjunction with
It the advantages of two kinds of connection types, i.e., effectively saves hardware spending, and can reach and realize quick multi-point temperature measurement, improve data and adopt
Collect the purpose of efficiency.
(2) design of site measuring and control extension set and its data convergence.
1. the extension set module based on STM32 microcontrollers
Extension set be for data acquisition, processing number is acute, data are shown and data upload to the exchange STM32 family chips
It is exclusively used in meeting energy consumption and uses embedded application requirements low, that process performance is strong, the real-time effect of chip is good, cheap.
STM32 series brings wide development space to microprocessor user, and provide 32 completely new products makes for user's selection
With combining the features such as properties of product are high, low energy consumption, real-time, voltage request is low, and be also equipped with the intensity of chip
Height and the advantages of facilitating exploitation.The task that STM32 microcontrollers in extension set undertake has the number for reading DS18B20 Temperature Humidity Sensors
According to, functions such as host connection communication, display data.
2. LoRa wireless networking communications
Radio frequency chip SX1278 is that most common LoRa chips, radio frequency band belong to ISM and open frequency on the market
Section is not necessarily to authorization.In view of the design of radio frequency PCB, the LoRa modules using SX1278 as core are finally selected.SX1278 has
There are high receiving sensitivity and anti-interference ability, the dynamic RSSI of 127dBm, maximum 20dBm transmission powers, more modulation side
Formula is optional and the functions such as carrier sense, and very easy to use, safety is good.Element picture and parameter are as shown in Figure 5.
(3) the live host based on STM32 microcontrollers
Live host includes mainly using STM32 microcontrollers as core：Clock-reset circuit, sound and light alarm module, network are logical
Believe module and circuit control module etc..Live host collects the data of thermometric extension set acquisition, sends data to cloud clothes in real time
Business device, and receive relevant information and relevant control is carried out to circuit and audible-visual annunciator.
Since this system is mainly for industrial equipment, working environment has sizable complexity and uncertainty, therefore
There are certain interference problems in the acquisition of temperature data and transmission process.And the particularity of this system monitoring object is to data
It is accurate acquisition with stablize transmission have higher requirement.Therefore, this project team is drafted solves problems using following scheme,
To ensure effective solution of interference problem.
(1) twisted-pair feeder
For parallel lines when transmitting high frequency network signal existing attenuation problem, we will be carried out using twisted-pair feeder
485 communications.In this way, a part can be not only resisted from extraneous Electromagnetic Interference, can also reduce multipair strand
Interfering with each other between line.The conducting wire that edge is thoroughly done away with two twists together mutually, and interference signal acts on this two and mutually kinks
It is consistent (this interference signal is called common-mode signal) on conducting wire together, can will be total in the difference channel for receiving signal
Mould signal is eliminated, to extract useful signal (difference mode signal).
(2) brown-out detector BOD is enabled
Due to electrostatic, strong-electromagnetic field environment may cause the charged moiety of the storage unit of EEPROM to be lost, and cause data
It loses or the holding time shortens, so needing to ensure that the information of EEPROM storages cannot lose.We are by enabling falling for chip
Power detection circuit BOD realizes that it is low that RESET signal is kept when MCU brownouts, to ensure that the reliable reset of system is restarted
And rewrite the data of EEPROM.
(3) digitally it is isolated with simulation
Due to the generally rectangular cross-section wave of digital signal, a large amount of harmonic wave is carried.If in circuit board digitally with simulation ground
It is not separated from access point, the harmonic wave in digital signal is easy to that the waveform of analog signal can be interfered with.When analog signal is height
When frequency or forceful electric power signal, the normal work of digital circuit is also influenced whether.Analog circuit is related to small and weak signal, but digital circuit
Threshold level is higher, and the requirement to power supply is just lower than analog circuit.Existing digital circuit has in the system of analog circuit again, number
The noise that word circuit generates can influence analog circuit, and the small signal index of analog circuit is made to be deteriorated, and the method overcome is to separate mould
Quasi-ly and digitally.
Basic reason of problems is can not to ensure that the resistance of copper foil on circuit board is zero, access point will digitally
With simulation it is separated, exactly in order to will digitally with simulation ground total ground resistance be minimized.So my overstriking and shorten ground wire,
Circuit portions are the optimal selections for inhibiting grounding interference using one point earth, can mainly prevent due to ground wire common impedance and
Interfering with each other between caused component.
The system establishes intelligent early-warning model by using proposition based on average weighted adaptive algorithm.The algorithm branch
Hold two kinds of prediction modes：Mode one, based on history within the next few days and the same day the cable operating temperature average value, can carry out round-the-clock
The dynamic prediction of cable operating temperature：
Here CpreL(t+1) it is t+1 (long-time) period cable operating temperature predicted value, CrealFor t period cable works
Make temperature measured value,For the average value of the cable operating temperature measured value of these last few days t+1 periods.μ (t) (0 ＜
μ (t) ＜ 1) it is weighted factor.Mode two：Based in one day certain time period and the cable operating temperature predicted before it is average
Value, can carry out the prediction of the cable operating temperature of next short time period：
CpreS(t+1)=μ (t) Creal(t)+(1-μ(t))Cpre(t)
Here CpreS(t+1) it is t+1 (short time) period cable operating temperature predicted value, Creal(t) it is the t periods
Cable operating temperature measured value, Cpre(t) it is the cable operating temperature predicted value of t periods.μ (t) (0 ＜ μ (t) ＜ 1) is weighting
The factor.
Mode one and mode two can according to the error between the measured value and predicted value of a upper period, to weighting because
Sub- u (t) carries out the adjust automatically of linear rule.When cable operating temperature predicted value and larger measured value difference, which can
Automatically it reduces the detection interval, is effectively guaranteed the accuracy of prediction.
It is obvious to a person skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and
And without departing substantially from the spirit or essential attributes of the utility model, it can realize that this practicality is new in other specific forms
Type.Therefore, in all respects, the present embodiments are to be considered as illustrative and not restrictive, this practicality is new
The range of type is indicated by the appended claims rather than the foregoing description, it is intended that containing in the equivalent requirements of the claims will be fallen
All changes in justice and range are embraced therein.Any reference numeral in claim should not be considered as limitation
Involved claim.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiment being appreciated that.
Claims (4)
1. a kind of power cable fire disaster intelligently prior-warning device, including site measuring and control subsystem and the backstage based on SAE Cloud Servers
Management system, which is characterized in that the background management system based on SAE Cloud Servers passes through the multiple scenes of wireless network connection
Communication subsystem, the site measuring and control subsystem include the first MCU, alarm module, the 2nd MCU, temperature sensor and alarm mould
Block, the first MCU branches connect WIFI module, alarm module and relay control module, and the 2nd MCU branches connect touch display screen
And temperature sensor, it is wirelessly connected by LoRa modules between the first MCU and the 2nd MCU.
2. a kind of power cable fire disaster intelligently prior-warning device according to claim 1, which is characterized in that the temperature sensing
The model DS18B20 of device.
3. a kind of power cable fire disaster intelligently prior-warning device according to claim 1, which is characterized in that the LoRa modules
Model SC1278.
4. a kind of power cable fire disaster intelligently prior-warning device according to claim 2, which is characterized in that the first MCU
Model with the 2nd MCU is STM32 series monolithics.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820397222.5U CN207993194U (en) | 2018-03-22 | 2018-03-22 | A kind of power cable fire disaster intelligently prior-warning device |
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| CN201820397222.5U CN207993194U (en) | 2018-03-22 | 2018-03-22 | A kind of power cable fire disaster intelligently prior-warning device |
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| CN207993194U true CN207993194U (en) | 2018-10-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110267201A (en) * | 2019-07-23 | 2019-09-20 | 克拉玛依油城数据有限公司 | Solar powered LoRa oil well instrument with positioning function |
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2018
- 2018-03-22 CN CN201820397222.5U patent/CN207993194U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110267201A (en) * | 2019-07-23 | 2019-09-20 | 克拉玛依油城数据有限公司 | Solar powered LoRa oil well instrument with positioning function |
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