CN106774034A - A kind of switch cubicle monitoring device - Google Patents
A kind of switch cubicle monitoring device Download PDFInfo
- Publication number
- CN106774034A CN106774034A CN201710146184.6A CN201710146184A CN106774034A CN 106774034 A CN106774034 A CN 106774034A CN 201710146184 A CN201710146184 A CN 201710146184A CN 106774034 A CN106774034 A CN 106774034A
- Authority
- CN
- China
- Prior art keywords
- dsp chip
- sensor
- switch cubicle
- monitoring device
- temperature
- 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.)
- Pending
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Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0428—Safety, monitoring
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
-
- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24024—Safety, surveillance
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24058—Remote testing, monitoring independent from normal control by pc
Abstract
A kind of switch cubicle monitoring device, is made up of dsp chip, Temperature and Humidity unit, displacement transducer and LCD display.Dsp chip uses large-scale industry level digital signal processor TMS320VC5409, and the first wireless communication module is connected on chip；Temperature and Humidity unit includes temperature sensor, humidity sensor and the single-chip microcomputer being connected with humidity sensor with temperature sensor, the second wireless communication module is connected on single-chip microcomputer, temperature detecting unit after the second wireless communication module and the first wireless communication module are communicated, by data wireless transmission to dsp chip；Displacement transducer, is connected by interface circuit with dsp chip；LCD display, by interface circuit and dsp chip, displays temperature and displacement data.The present invention can realize the real-time monitoring of switchgear temperature and humidity, intelligent control heater, automatically adjust ambient humidity, the insulating properties of protection switch equipment, effectively solve the problems, such as to cause equipment damage in switch cubicle because of electric arc heat release.
Description
Technical field
The invention belongs to power equipment preparation field, more particularly to a kind of switch cubicle monitoring device.
Background technology
High-voltage switch gear cabinet equipment is the key equipment of power system, and the running status of equipment has to the reliability of power system
There is significant impact.With the expansion of power plant's capacity, the quantity of power plant's switchgear increases year by year.In order to understand switchgear in time
Operation conditions, grasps its variation tendency, for the maintenance and maintenance of equipment provide foundation, with the detection of the presence of switchgear with
The research of the intelligent high-voltage switch equipment that fault diagnosis is characterized progressively turns into a heat of Automation of Electric Systems research
Point.
Switch in switch cubicle is that two contacts are connected, in moving process is switched, because electric current is produced compared with big city
Larger electric arc, the relevant device that can be damaged in switch cubicle if electric arc heat release is too high.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of switch cubicle monitoring device, solve electric arc heat release too high
The problem of the relevant device that words can be damaged in switch cubicle.
The present invention is achieved in that a kind of switch cubicle monitoring device, and the equipment is placed on insulating support member, including：
Dsp chip, the dsp chip uses large-scale industry level digital signal processor TMS320VC5409, the dsp chip
The first wireless communication module of upper connection；Temperature and Humidity unit, including temperature sensor, humidity sensor and and TEMP
The single-chip microcomputer that device is connected with humidity sensor, connects the second wireless communication module on the single-chip microcomputer, temperature detecting unit passes through
After second wireless communication module and the communication of the first wireless communication module, by data wireless transmission to dsp chip；
Displacement transducer, is connected by interface circuit with dsp chip, and institute's displacement sensors are set to three, are separately positioned on
It is detected the 3 phase contacts lower section of switch cubicle；LCD display, by interface circuit and dsp chip, displays temperature and displacement data.
Further, the input of dsp chip is connected with switching voltage sensor, switching current and senses by interface circuit
Device, separating brake voltage sensor, separating brake current sensor, tank voltage sensor and energy storage current sensor.
Further, institute's displacement sensors are inserted in displacement transducer using conductive plastic enclosure, by a connecting plate
Displacement transducer is drawn the lower section for being connected to contact of breaker.
Further, the output end connection solenoid valve controller of dsp chip, magnetic valve is controlled by the solenoid valve controller
The insulating foams sprayer of connection.
Further, on the dsp chip by data acquisition unit connect electric-field sensor, the electric-field sensor with
Insulating support member is contacted.
Further, the equipment includes heater, and the heater is connected by magnetic valve with power supply, and magnetic valve passes through electromagnetism
After valve control is connected with dsp chip, it is opened and closed by the solenoid valve control.
Further, the dsp chip passes through standard 485 and IEC61850 data-interfaces, by serial ports or usb mouthfuls and notes
This computer is attached.
Further, in switchgear internal breaker dynamic/static contact contact position and the arrangement shooting of earthing knife-edge positions
Head, the camera is connected transmission data with notebook computer.
Further, in switchgear internal breaker dynamic/static contact contact position and the arrangement shooting of earthing knife-edge positions
Head, the camera is connected with dsp chip.
Compared with prior art, beneficial effect is the present invention：The present invention is improved for the monitoring of switchgear humiture
Or ambient humidity is reduced, control heater is automatically stopped heating, the insulating properties of protection switch equipment.Solve electric arc heat release too high
If the problem of relevant device that can damage in switch cubicle.
The displacement transducer feature of use is to use conductive plastic enclosure, can quickly be shunted in killer switch big
Electric current, protects displacement transducer core not impacted, and plastic casing is lightweight in addition, to the opening and closing movement of breaker burden compared with
It is small.Displacement transducer is arranged in the measurement for carrying out breaking mechanical property below moving contact of breaker.3 independent displacements
Sensor can respectively measure the motion of 3 phase contacts.
Data processing is carried out to collection signal using digital signal processor TMS320VC5409, numeral is carried out using DSP
During signal transacting, signal can be extracted from noise, i.e., there is noise and the mixing source of signal to sample to one, Ran Houjing
Cross internal digital filter and filter noise, extract useful signal, electromagnetic interference is big, and surge is strong.
Data acquisition unit connection electric-field sensor is crossed, electric-field sensor is contacted to insulative support parts with insulating support member
The measurement of part leakage current, detects that the precision of leakage current reaches 2%;Leakage current alarming threshold value can be set, and forecast leakage current
The rate of accuracy reached of failure is to 100%.
Brief description of the drawings
Fig. 1 is device structure schematic diagram provided in an embodiment of the present invention.
Fig. 2 is the structural representation of displacement transducer provided in an embodiment of the present invention.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Referring to Fig. 1, a kind of switch cubicle monitoring device, the equipment is placed on insulating support member, including：Dsp chip, DSP
Chip uses large-scale industry level digital signal processor TMS320VC5409, and the first wireless telecommunications are connected on dsp chip
Module, the first wireless communication module here uses existing module, such as can be SL-TR01 type temperature in the present embodiment
Degree wireless module；To one there is noise and signal to mix using large-scale industry level digital signal processor TMS320VC5409
Conjunction source is sampled, then by a digital filtering inside large-scale industry level digital signal processor TMS320VC5409
Device filters noise, extracts useful signal.
Temperature and Humidity unit, including temperature sensor, humidity sensor and with temperature sensor and humidity sensor
AT89S52 single board computer-the 24PU of connection, connects the second wireless communication module on single-chip microcomputer, temperature detecting unit is by described the
After two wireless communication modules and the communication of the first wireless communication module, by data wireless transmission to dsp chip；In the present embodiment, adopt
It is capable of achieving with the temperature sensor and humidity sensor of disposable type on the market.Temperature and Humidity unit is by 2.4G without line number
Temperature data is sent according to transmission means.
Displacement transducer is set, is connected with dsp chip by interface circuit, displacement transducer is set to three, sets respectively
Put and be detected below 3 phase contacts of switch cubicle；Here interface circuit is the conventional interface circuit for connecting dsp chip.Referring to
Fig. 2, displacement transducer 2 is inserted in displacement transducer 2 using conductive plastic enclosure 1, by a connecting plate 3 by displacement transducer
Extraction is connected to the lower section of contact of breaker 4.
LCD display passes through interface circuit and dsp chip, displays temperature and displacement data.
Switching voltage sensor, switching current sensor, separating brake are connected with by interface circuit in the input of dsp chip
Voltage sensor, separating brake current sensor, tank voltage sensor and energy storage current sensor, switching voltage electric current are contact
Rear contact voltage-to-ground is closed, contact flows through electric current, and separating brake voltage x current is the voltage and current between switch opens moment contact,
Tank voltage electric current is to provide electrodynamic voltage x current to open being automatically brought into operation for contact.
The output end connection solenoid valve controller of dsp chip, controls what magnetic valve was connected by the solenoid valve controller
Insulating foams sprayer.Here solenoid valve controller be custom circuit, specific structure is no longer given herein, if overheat and
Electric current is excessive, to insulating foams are sprayed in switch cubicle, prevents on fire, while controlling each communication interface, receives and sends display number
According to.
Electric-field sensor is connected by data acquisition unit on dsp chip, electric-field sensor connects with insulating support member
Touch.The model C2000CJ200 that data acquisition unit herein can be used, electric-field sensor uses to have bought on the market to be had
The sensor of this function can be realized, for example with the electric-field sensor of mc33794 models.
The equipment includes heater, and heater is connected by magnetic valve with power supply, magnetic valve pass through solenoid valve controller and
After dsp chip connection, it is opened and closed by the solenoid valve control.Ambient humidity is improved or reduces, when temperature rises to predetermined value and wet
During angle value, control heater is automatically stopped heating, the insulating properties of protection switch equipment.
Dsp chip is carried out by standard 485 and IEC61850 data-interfaces by serial ports or usb mouthfuls and notebook computer
Connection.
In switchgear internal breaker dynamic/static contact contact position and earthing knife-edge positions arrangement camera, shooting
Head is connected transmission data with notebook computer.
Motion process and running status that camera is used for inside monitoring device, make operating personnel in remote operation apparatus mistake
In journey can direct real-time monitored device interior dynamic video, grasp control motion process and implementing result.
Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the invention, it is all in essence of the invention
Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.
Claims (8)
1. a kind of switch cubicle monitoring device, it is characterised in that the equipment is placed on insulating support member, including：Dsp chip, institute
State dsp chip and use large-scale industry level digital signal processor TMS320VC5409, first is connected on the dsp chip
Wireless communication module；Temperature and Humidity unit, including temperature sensor, humidity sensor and passed with temperature sensor and humidity
The single-chip microcomputer of sensor connection, connects the second wireless communication module on the single-chip microcomputer, temperature detecting unit is by second nothing
After line communication module is communicated with the first wireless communication module, by data wireless transmission to dsp chip；Displacement transducer, by connecing
Mouth circuit is connected with dsp chip, and institute's displacement sensors are set to three, are separately positioned on 3 phase contacts of detected switch cubicle
Lower section；LCD display, by interface circuit and dsp chip, displays temperature and displacement data.
2. switch cubicle monitoring device as claimed in claim 1, it is characterised in that the input of dsp chip passes through interface circuit
Switching voltage sensor, switching current sensor, separating brake voltage sensor, separating brake current sensor, tank voltage is connected with to pass
Sensor and energy storage current sensor.
3. switch cubicle monitoring device as claimed in claim 1, it is characterised in that institute's displacement sensors are using outside conductive plastics
Valve jacket enters in displacement transducer, and displacement transducer is drawn the lower section for being connected to contact of breaker by a connecting plate.
4. switch cubicle monitoring device as claimed in claim 1, it is characterised in that the output end connection electromagnetism of the dsp chip
Valve control, the insulating foams sprayer of magnetic valve connection is controlled by the solenoid valve controller.
5. switch cubicle monitoring device as claimed in claim 1, it is characterised in that pass through data acquisition on the dsp chip
Unit connects electric-field sensor, and the electric-field sensor is contacted with insulating support member.
6. switch cubicle monitoring device as claimed in claim 1, it is characterised in that the equipment includes heater, the heater
Be connected with power supply by magnetic valve, magnetic valve after solenoid valve controller is connected with dsp chip, by the solenoid valve control
Opening and closing.
7. switch cubicle monitoring device as claimed in claim 1, it is characterised in that the dsp chip passes through the He of standard 485
IEC61850 data-interfaces, are attached by serial ports or usb mouthfuls and notebook computer.
8. switch cubicle monitoring device as claimed in claim 7, it is characterised in that in switchgear internal breaker dynamic/static contact
Contact position and earthing knife-edge positions arrangement camera, the camera are connected transmission data with notebook computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710146184.6A CN106774034A (en) | 2017-03-13 | 2017-03-13 | A kind of switch cubicle monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710146184.6A CN106774034A (en) | 2017-03-13 | 2017-03-13 | A kind of switch cubicle monitoring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106774034A true CN106774034A (en) | 2017-05-31 |
Family
ID=58962504
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710146184.6A Pending CN106774034A (en) | 2017-03-13 | 2017-03-13 | A kind of switch cubicle monitoring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106774034A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109725253A (en) * | 2019-03-14 | 2019-05-07 | 山东省产品质量检验研究院 | A kind of hot memory test test device and application of control and protective switching device |
| CN109887031A (en) * | 2019-01-30 | 2019-06-14 | 国网湖南省电力有限公司 | Position and posture detection method, system, medium and the equipment of earthing knife-switch in a kind of switchgear |
| CN110362137A (en) * | 2019-07-19 | 2019-10-22 | 武汉华源铸诚电力股份有限公司 | A kind of power detecting management system |
| CN111829589A (en) * | 2020-07-16 | 2020-10-27 | 湖北航天保华科技股份有限公司 | Anti-interference self-checking system of military electric cabinet in complex environment |
| CN112834064A (en) * | 2019-11-25 | 2021-05-25 | 北京小米移动软件有限公司 | Temperature detection device |
| CN113281643A (en) * | 2021-05-12 | 2021-08-20 | 陕西西高开关有限责任公司 | Intelligent detection and early warning system for engagement fault of draw-out type circuit breaker contact |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201758250U (en) * | 2010-05-14 | 2011-03-09 | 河南思达高科技股份有限公司 | Minitype fixed metal-enclosed switchgear |
| CN102244416A (en) * | 2010-11-16 | 2011-11-16 | 江苏科技大学 | Intelligent cubicle switchboard oriented to intelligent power grid and operating and controlling method thereof |
| CN202059213U (en) * | 2011-04-07 | 2011-11-30 | 江苏科技大学 | High tension switchgear controller possessing on-line monitoring and network communication functions |
| CN102510007A (en) * | 2011-11-10 | 2012-06-20 | 杭州恒信电气有限公司 | Intelligent medium voltage switch cabinet |
| CN103259208A (en) * | 2013-06-03 | 2013-08-21 | 宁波电业局 | Intelligent medium voltage switch cabinet |
| CN103457192A (en) * | 2013-08-09 | 2013-12-18 | 南京大全自动化科技有限公司 | Intelligent medium voltage switch cabinet |
| CN103713216A (en) * | 2013-12-25 | 2014-04-09 | 深圳供电局有限公司 | Intelligent on-line monitoring device of medium voltage switchgear |
| CN104174131A (en) * | 2014-09-01 | 2014-12-03 | 国家电网公司 | Self-extinguishing device for cable |
| CN105322450A (en) * | 2015-11-26 | 2016-02-10 | 国网福建省电力有限公司 | Combination switch cabinet with fire extinguishing function and application method of combination switch cabinet |
| KR101604110B1 (en) * | 2015-09-24 | 2016-03-16 | 박우순 | Busbar of switchgear integrated management system by using non contackt type integrated temperature and humidity sensor |
| CN205844420U (en) * | 2016-05-04 | 2016-12-28 | 国网江苏省电力公司电力科学研究院 | A kind of power switch cabinet condition monitoring system |
-
2017
- 2017-03-13 CN CN201710146184.6A patent/CN106774034A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201758250U (en) * | 2010-05-14 | 2011-03-09 | 河南思达高科技股份有限公司 | Minitype fixed metal-enclosed switchgear |
| CN102244416A (en) * | 2010-11-16 | 2011-11-16 | 江苏科技大学 | Intelligent cubicle switchboard oriented to intelligent power grid and operating and controlling method thereof |
| CN202059213U (en) * | 2011-04-07 | 2011-11-30 | 江苏科技大学 | High tension switchgear controller possessing on-line monitoring and network communication functions |
| CN102510007A (en) * | 2011-11-10 | 2012-06-20 | 杭州恒信电气有限公司 | Intelligent medium voltage switch cabinet |
| CN103259208A (en) * | 2013-06-03 | 2013-08-21 | 宁波电业局 | Intelligent medium voltage switch cabinet |
| CN103457192A (en) * | 2013-08-09 | 2013-12-18 | 南京大全自动化科技有限公司 | Intelligent medium voltage switch cabinet |
| CN103713216A (en) * | 2013-12-25 | 2014-04-09 | 深圳供电局有限公司 | Intelligent on-line monitoring device of medium voltage switchgear |
| CN104174131A (en) * | 2014-09-01 | 2014-12-03 | 国家电网公司 | Self-extinguishing device for cable |
| KR101604110B1 (en) * | 2015-09-24 | 2016-03-16 | 박우순 | Busbar of switchgear integrated management system by using non contackt type integrated temperature and humidity sensor |
| CN105322450A (en) * | 2015-11-26 | 2016-02-10 | 国网福建省电力有限公司 | Combination switch cabinet with fire extinguishing function and application method of combination switch cabinet |
| CN205844420U (en) * | 2016-05-04 | 2016-12-28 | 国网江苏省电力公司电力科学研究院 | A kind of power switch cabinet condition monitoring system |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109887031A (en) * | 2019-01-30 | 2019-06-14 | 国网湖南省电力有限公司 | Position and posture detection method, system, medium and the equipment of earthing knife-switch in a kind of switchgear |
| CN109725253A (en) * | 2019-03-14 | 2019-05-07 | 山东省产品质量检验研究院 | A kind of hot memory test test device and application of control and protective switching device |
| CN109725253B (en) * | 2019-03-14 | 2023-11-24 | 山东省产品质量检验研究院 | Thermal memory test device for control and protection switch electric appliance and application |
| CN110362137A (en) * | 2019-07-19 | 2019-10-22 | 武汉华源铸诚电力股份有限公司 | A kind of power detecting management system |
| CN112834064A (en) * | 2019-11-25 | 2021-05-25 | 北京小米移动软件有限公司 | Temperature detection device |
| CN112834064B (en) * | 2019-11-25 | 2023-02-24 | 北京小米移动软件有限公司 | Temperature detection device |
| CN111829589A (en) * | 2020-07-16 | 2020-10-27 | 湖北航天保华科技股份有限公司 | Anti-interference self-checking system of military electric cabinet in complex environment |
| CN113281643A (en) * | 2021-05-12 | 2021-08-20 | 陕西西高开关有限责任公司 | Intelligent detection and early warning system for engagement fault of draw-out type circuit breaker contact |
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