CN204405216U - A kind of Temperature of Power Cables on-line monitoring system based on GPRS network - Google Patents
A kind of Temperature of Power Cables on-line monitoring system based on GPRS network Download PDFInfo
- Publication number
- CN204405216U CN204405216U CN201420818545.9U CN201420818545U CN204405216U CN 204405216 U CN204405216 U CN 204405216U CN 201420818545 U CN201420818545 U CN 201420818545U CN 204405216 U CN204405216 U CN 204405216U
- Authority
- CN
- China
- Prior art keywords
- temperature
- cable
- circuit
- voltage
- monitoring system
- 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.)
- Expired - Fee Related
Links
Landscapes
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
A kind of Temperature of Power Cables on-line monitoring system based on GPRS network, its composition comprises: conductor element, temperature detecting module, GPRS wireless communication module, cable surface temperature collection circuit, current measurement circuit, data monitoring server, it is characterized in that temperature detection part needs cable surface temperature collection circuit and cable work current measurement circuit, magnitude of voltage after collecting conversion is converted to digital quantity through AD converter be sent to single-chip microcomputer and carry out hygrometric formula calculating, finally by the Temperature numerical that obtains by RS-485 bus transfer to GPRS wireless communication module.Alarm made to cable abnormal operating condition and cuts off action, and these information being passed to power scheduling personnel and carry out the foundation of overhauling and dispatching as them.The temperature monitoring of power cable of the present utility model mainly measures conductor temperature when cable works, and afterwards Temperature numerical is transferred to Surveillance center through GPRS wireless communication module.
Description
Technical field
The utility model relates to a kind of data acquisition detection system, particularly a kind of system utilizing gprs system detection streamer temperature.
Background technology
With the fast development of Chinese national economy, urban construction and modernization of business degree improve, and the power industry as lifelines of the national economy encounters unprecedented challenge.In order to meet power demands, the proportion in urban distribution network shared by power cable is increasing, thus causes operational management to power cable, detects the workload safeguarded and get more and more.China's urban network reconstruction has two outstanding features, and one is power supply mode looped network, and two is transmission and distribution networks cables.Wherein transmission and distribution networks cable is exactly cable transmission line 10KV (or the more voltage levels) overhead transmission line in city being changed into underground laying, to improve power supply reliability and beautifying urban environment.In order to the transport capacity of security improvement power cable, ensure the running environment of power cable facility and the ontological security of power cable facility, must make existing cable monitoring system and improving to supervise the new running status of power cable.
Around direct-burried buried cable, the migration of humidity has close ties with the temperature variation of evaporation and cable.The cable installed in tunnel, heat radiation, the thermal convection of the convection current of air, cable itself and tunnel wall also all have impact to conductor temperature.When cable direct-burried, if the thermal characteristics of environment is stable, the cable temperature rise based on environment can be solved by linear superposition method, but when environment is a nonlinear thermal characteristics, linear superposition method is also inapplicable.If as can be seen here can according to the actual motion state of cable and running environment, simulate the installation environment of cable and the running status of cable, make the calculating of conductor temperature more accurate, this makes it possible to monitor in real time cable operating load and adjust, the on-load ability of cable itself is not only made to be played fully, and can Timeliness coverage cable run in abnormal state of affairs, the electric power supply problem solved in power scheduling under emergency is played a positive role.
So, be no matter the safe operation angle from power cable self, or from the angle that electric power system dispatching needs, all need to carry out Real-Time Monitoring to the operation conditions of power cable.Under ensureing the operation of cable under non-fault risk, improve cable utilization factor, more and more important to the Real-Time Monitoring of cable, therefore the acquisition of conductor temperature information just has the effect that it is more positive in real time.For this reason herein according to the heat generation characteristic of cable itself and the environmental factor of combined influence cable temperature rise, the calculating of cable conductor real time temperature is analyzed.
Utility model content
The purpose of this utility model is exactly calculate the running temperature Real-Time Monitoring of cable, high-tension cable is made to carry more load when being no more than temperature extremes, and can the temperature rise that causes of predicted current increase in case cable run in the temperature over-range that causes of emergency load, and detection of dynamic is carried out to power cable running environment, thus promote the on-load ability of power cable under actual motion state.Meanwhile, alarm made to cable abnormal operating condition and cuts off action, and these information being passed to power scheduling personnel and carry out the foundation of overhauling and dispatching as them.
The purpose of this utility model is achieved in that
A kind of Temperature of Power Cables on-line monitoring system based on GPRS network, its composition comprises: conductor element, temperature detecting module, GPRS wireless communication module, cable surface temperature collection circuit, current measurement circuit, data monitoring server, it is characterized in that temperature detection part needs cable surface temperature collection circuit and cable work current measurement circuit, magnitude of voltage after collecting conversion is converted to digital quantity through AD converter be sent to single-chip microcomputer and carry out hygrometric formula calculating, finally by the Temperature numerical that obtains by RS-485 bus transfer to GPRS wireless communication module.
Described a kind of Temperature of Power Cables on-line monitoring system based on GPRS network, it is characterized in that: be adopt shunt regulator TL431 and potentiometer VR1 to regulate the reference power source producing 4.096V in the temperature collection circuit of design, R1, R2, PT100 is adopted to form measuring bridge, wherein R1=R2, R19 is 100 Ω precision resistances, because the resistance of PT100 0 DEG C time is 100 Ω, thus when the resistance value of sensor and the resistance value of R19 unequal time, electric bridge exports the pressure difference signal of a mV level.
Described a kind of Temperature of Power Cables on-line monitoring system based on GPRS network, it is characterized in that: the secondary circuit of current transformer is equivalent to a current source, the resistance coating-forming voltage source of upper 200 Ω in parallel, voltage max is 0.5V, through in-phase proportion amplifying circuit, enlargement factor A=(1+R47/R46) (R49+R48)/R49=10, makes amplification voltage max be 5V.
The temperature monitoring of power cable of the present utility model mainly measures conductor temperature when cable works, and afterwards Temperature numerical is transferred to Surveillance center through GPRS wireless communication module.And temperature computation part needs cable surface temperature collection circuit and cable work current measurement circuit, magnitude of voltage after collecting conversion is converted to digital quantity through AD converter be sent to single-chip microcomputer and carry out hygrometric formula calculating, finally by the Temperature numerical that obtains by RS-485 bus transfer to GPRS wireless communication module.
Adopt shunt regulator TL431 and potentiometer VR1 to regulate the reference power source producing 4.096V in the temperature collection circuit of design, R1, R2, PT100 is adopted to form measuring bridge (wherein R1=R2, R19 is 100 Ω precision resistances), because the resistance of PT100 0 DEG C time is 100 Ω, so when the resistance value of sensor and the resistance value of R19 unequal time, electric bridge exports the pressure difference signal of a mV level, this pressure difference signal through amplifier LM324 amplify after export expect size voltage signal, be connected with AD conversion chip after second-order filter circuit.R3=R4, R5=R6, enlargement factor A=R5/R3 in differential amplifier circuit, amplifier adopts+12V power voltage supply.
The secondary circuit of current transformer is equivalent to a current source, the resistance coating-forming voltage source of upper 200 Ω in parallel, voltage max is 0.5V, through in-phase proportion amplifying circuit, enlargement factor A=(1+R47/R46) (R49+R48)/R49=10, makes amplification voltage max be 5V.Because cable self conductor working current is alternating current, at this moment the voltage signal through amplifying also is an alternating voltage, magnitude of voltage is-5V ~+5V, so add again an absolute value amplifying circuit, wherein there are two switching diodes, integrated transporting discharging selects OP07, connects positive and negative 12V power supply, makes the magnitude of voltage of output terminal be 0 ~+5V like this.Finally add a second-order filter circuit, enlargement factor gets 1, and cutoff frequency chooses 10Hz, and removing harmonic wave and undesired signal, make magnitude of voltage be tending towards straight, and the magnitude of voltage allowing output terminal produce is 0 to+5V, receives 2 passwaies of AD converter, carries out analog to digital conversion.
Workflow of the present utility model is such parameter value that temperature sensor summation current transformer first should be had to measure, in Single Chip Microcomputer (SCM) program, cable temperature formulae discovery is carried out after AD conversion, other constants every of cable are then determined by the model of cable, so the different constant numerical value of the different model of reply cable carry out layout be made into form, be preset in the EEPROM of single-chip microcomputer after unified planning, if substitute into the numerical value that cable model just directly can call parameters in program.Both end voltage value what self the resistance value that the magnitude of voltage being transferred to AD conversion through temperature sensor can release PT100, the surface temperature numerical value of cable can be obtained by consulting related data, the current value measured through the current transformer of AD conversion equally also can obtain by calculating, just can calculate the working temperature of cable when parametric variables all in cable temperature calculation procedure so is all learnt.
The utility model has the advantages that: Temperature of Power Cables on-line monitoring system of the present utility model, according to the thermal characteristics information of the mounting means of cable, cable surface temperature and load current and wireline environment, utilize real-time calculation procedure to calculate the running temperature of conductor, guarantee that power cable to operate in a rated temperature range and to ensure that overheated and situation that is premature ageing can not occur cable.When cable emerged in operation Load Emergency, real-time monitoring system can help this emergency of the more effective solution of operating personnel, adjusts cable transmission capacity under allowable temperature, not only improves the utilization factor of cable but also can ensure that the health of electric power system is run.
Accompanying drawing explanation
Fig. 1 is temperature collection circuit figure;
Fig. 2 is the schematic diagram of current measuring device;
Embodiment
Below in conjunction with accompanying drawing citing, the utility model is described in more detail:
A kind of Temperature of Power Cables on-line monitoring system based on GPRS network, its composition comprises: conductor element, temperature detecting module, GPRS wireless communication module, cable surface temperature collection circuit, current measurement circuit, data monitoring server, it is characterized in that temperature detection part needs cable surface temperature collection circuit and cable work current measurement circuit, magnitude of voltage after collecting conversion is converted to digital quantity through AD converter be sent to single-chip microcomputer and carry out hygrometric formula calculating, finally by the Temperature numerical that obtains by RS-485 bus transfer to GPRS wireless communication module.
Adopt shunt regulator TL431 and potentiometer VR1 to regulate the reference power source producing 4.096V in the temperature collection circuit of above-mentioned design, R1, R2, PT100 is adopted to form measuring bridge, wherein R1=R2, R19 is 100 Ω precision resistances, because the resistance of PT100 0 DEG C time is 100 Ω, so when the resistance value of sensor and the resistance value of R19 unequal time, electric bridge exports the pressure difference signal of a mV level.
The secondary circuit of above-mentioned current transformer is equivalent to a current source, the resistance coating-forming voltage source of upper 200 Ω in parallel, voltage max is 0.5V, through in-phase proportion amplifying circuit, enlargement factor A=(1+R47/R46) (R49+R48)/R49=10, makes amplification voltage max be 5V.
Composition graphs 1, Fig. 1 is temperature collection circuit figure.Adopt shunt regulator TL431 and potentiometer VR1 to regulate the reference power source producing 4.096V in the temperature collection circuit of design, R1, R2, PT100 is adopted to form measuring bridge (wherein R1=R2, R19 is 100 Ω precision resistances), because the resistance of PT100 0 DEG C time is 100 Ω, so when the resistance value of sensor and the resistance value of R19 unequal time, electric bridge exports the pressure difference signal of a mV level, this pressure difference signal through amplifier LM324 amplify after export expect size voltage signal, be connected with AD conversion chip after second-order filter circuit.R3=R4, R5=R6, enlargement factor A=R5/R3 in differential amplifier circuit, amplifier adopts+12V power voltage supply.
Composition graphs 2, Fig. 2 is the schematic diagram of current measuring device.The secondary circuit of current transformer is equivalent to a current source, the resistance coating-forming voltage source of upper 200 Ω in parallel, voltage max is 0.5V, through in-phase proportion amplifying circuit, enlargement factor A=(1+R47/R46) (R49+R48)/R49=10, makes amplification voltage max be 5V.Because cable self conductor working current is alternating current, at this moment the voltage signal through amplifying also is an alternating voltage, magnitude of voltage is-5V ~+5V, so add again an absolute value amplifying circuit, wherein there are two switching diodes, integrated transporting discharging selects OP07, connects positive and negative 12V power supply, makes the magnitude of voltage of output terminal be 0 ~+5V like this.Finally add a second-order filter circuit, enlargement factor gets 1, and cutoff frequency chooses 10Hz, and removing harmonic wave and undesired signal, make magnitude of voltage be tending towards straight, and the magnitude of voltage allowing output terminal produce is 0 to+5V, receives 2 passwaies of AD converter, carries out analog to digital conversion.
Claims (3)
1. the Temperature of Power Cables on-line monitoring system based on GPRS network, its composition comprises: conductor element, temperature detecting module, GPRS wireless communication module, cable surface temperature collection circuit, current measurement circuit, data monitoring server, it is characterized in that temperature detection part needs cable surface temperature collection circuit and cable work current measurement circuit, magnitude of voltage after collecting conversion is converted to digital quantity through AD converter be sent to single-chip microcomputer and carry out hygrometric formula calculating, finally by the Temperature numerical that obtains by RS-485 bus transfer to GPRS wireless communication module.
2. a kind of Temperature of Power Cables on-line monitoring system based on GPRS network according to claim 1, it is characterized in that: be adopt shunt regulator TL431 and potentiometer VR1 to regulate the reference power source producing 4.096V in the temperature collection circuit of design, R1, R2, PT100 is adopted to form measuring bridge, wherein R1=R2, R19 is 100 Ω precision resistances, because the resistance of PT100 0 DEG C time is 100 Ω, so when the resistance value of sensor and the resistance value of R19 unequal time, electric bridge exports the pressure difference signal of a mV level.
3. a kind of Temperature of Power Cables on-line monitoring system based on GPRS network according to claim 1, it is characterized in that: the secondary circuit of current transformer is equivalent to a current source, the resistance coating-forming voltage source of upper 200 Ω in parallel, voltage max is 0.5V, through in-phase proportion amplifying circuit, enlargement factor A=(1+R47/R46) (R49+R48)/R49=10, makes amplification voltage max be 5V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420818545.9U CN204405216U (en) | 2014-12-21 | 2014-12-21 | A kind of Temperature of Power Cables on-line monitoring system based on GPRS network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420818545.9U CN204405216U (en) | 2014-12-21 | 2014-12-21 | A kind of Temperature of Power Cables on-line monitoring system based on GPRS network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204405216U true CN204405216U (en) | 2015-06-17 |
Family
ID=53429066
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420818545.9U Expired - Fee Related CN204405216U (en) | 2014-12-21 | 2014-12-21 | A kind of Temperature of Power Cables on-line monitoring system based on GPRS network |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204405216U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105302181A (en) * | 2015-11-02 | 2016-02-03 | 国网上海市电力公司 | Electric power tunnel cable temperature control system and method |
| CN105527986A (en) * | 2015-12-11 | 2016-04-27 | 成都翰道科技有限公司 | Intelligent aerator control system based on two-stage filter circuit |
| CN110702254A (en) * | 2019-10-28 | 2020-01-17 | 徐州贝尔电气有限公司 | Circuit for measuring temperature of object to be measured |
| CN115186422A (en) * | 2022-09-09 | 2022-10-14 | 特变电工山东鲁能泰山电缆有限公司 | Simulation analysis method, device and medium for operating characteristics of in-phase parallel cables |
-
2014
- 2014-12-21 CN CN201420818545.9U patent/CN204405216U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105302181A (en) * | 2015-11-02 | 2016-02-03 | 国网上海市电力公司 | Electric power tunnel cable temperature control system and method |
| CN105302181B (en) * | 2015-11-02 | 2017-07-28 | 国网上海市电力公司 | A kind of power tunnel cable temperature control system and method |
| CN105527986A (en) * | 2015-12-11 | 2016-04-27 | 成都翰道科技有限公司 | Intelligent aerator control system based on two-stage filter circuit |
| CN110702254A (en) * | 2019-10-28 | 2020-01-17 | 徐州贝尔电气有限公司 | Circuit for measuring temperature of object to be measured |
| CN115186422A (en) * | 2022-09-09 | 2022-10-14 | 特变电工山东鲁能泰山电缆有限公司 | Simulation analysis method, device and medium for operating characteristics of in-phase parallel cables |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202041178U (en) | On-line monitoring system for power transmission line sag | |
| CN204405216U (en) | A kind of Temperature of Power Cables on-line monitoring system based on GPRS network | |
| CN102680798B (en) | Online measurement method and device for grounding resistor of rod tower | |
| CN203673005U (en) | Direct current insulation monitor | |
| CN106546859A (en) | A kind of on-line monitoring system for cable arrester | |
| CN105391168B (en) | Transformer load real-time control method | |
| CN203883556U (en) | Ship shore power device with abnormal monitoring function | |
| CN105093047A (en) | Electric power line current-carrying capacity monitoring and early warning system | |
| CN111007419A (en) | Transformer substation direct current system running state on-line monitoring system | |
| CN104515623A (en) | Watch strap type passive wireless online temperature measuring device and monitoring system thereof | |
| CN110986791A (en) | Online measurement system and measurement method for AB value of electrified railway contact net compensation device | |
| CN201926727U (en) | Power quality monitor | |
| CN108318732B (en) | On-line monitoring device and method for grounding current of transformer core | |
| CN103235226A (en) | OPPC (optical phase conductor) dynamic capacity increasing on-line monitoring device and monitoring method | |
| CN105300557A (en) | Cable conductor temperature measuring device and method | |
| CN102901868A (en) | Method for electric energy acquisition system data checking | |
| CN103941138A (en) | OPGW whole-wire monitoring and diagnosing system and method | |
| WO2022193661A1 (en) | Transformer reactive power disturbance calculation method based on gic monitoring device | |
| CN105676015A (en) | Transmission line carrying capacity calculation method | |
| CN110531302A (en) | Intelligent electric energy meter failure mechanism and condition monitoring system and method | |
| CN202548079U (en) | On-line remote monitoring device for dirty state of disc type insulator | |
| CN204906010U (en) | Transmission line dynamic monitoring early warning system | |
| CN107727968A (en) | A kind of dry-type transformer condition monitoring device | |
| CN105784169A (en) | GPRS network-based power cable temperature online monitoring system | |
| CN206906488U (en) | A kind of ultra-high-tension power transmission line electromagnetic environment remote supervision system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150617 Termination date: 20161221 |