CN2599549Y - Electric power cable explosion-proof on-line monitor - Google Patents
Electric power cable explosion-proof on-line monitor Download PDFInfo
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- CN2599549Y CN2599549Y CNU032001347U CN03200134U CN2599549Y CN 2599549 Y CN2599549 Y CN 2599549Y CN U032001347 U CNU032001347 U CN U032001347U CN 03200134 U CN03200134 U CN 03200134U CN 2599549 Y CN2599549 Y CN 2599549Y
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Abstract
The utility model discloses an online monitoring device for protection of power-cable explosion. The utility model comprises a computer, a communication cable, a collector and an integrated digital temperature sensor. The collector mainly comprises a main power source circuit for the collector, a watchdog circuit, a storage, a temperature conversion circuit, a CPU circuit, an auxiliary power supply for the collector, a communication circuit and an optoelectronic isolator; 2 parallel and symmetric integrated digital temperature sensors are installed on the surface of each power-cable joint, and 1 integrated digital temperature sensor is arranged 200mm away from the power cable. The temperature data are transmitted to the collector through the cable of the integrated digital temperature sensor; the collector is connected to the computer by the communication cable; all data are transmitted to the computer for processing, and indication and alarm are made. Through uninterrupted monitoring and analysis on the power-cable joint, early diagnosis can be conducted; the regular decentralized manual check is replaced by centralized and uninterrupted monitoring. As a result, any explosion accident on the power-cable joint can be effectively prevented.
Description
Affiliated technical field
The utility model relates to the explosion-proof on-Line Monitor Device of a kind of power cable, can be to explosion-proof early stage analyzing and diagnosing, the genus computer autocontrol technique field of carrying out of cable.
Background technology
In the cable duct of generating plant and electric substation, be distributed with a large amount of power cables, electric pressure is more than 6KV, because circuit is longer, a lot of power cables all have intermediate head, joint adopts the crimping mode to connect, be subjected to this to connect the restriction of technology, all there is certain contact resistance in the joint, under the effect of big electric current, the power cable connector place can produce certain temperature rise, contact resistance is very little during beginning, and the temperature of power cable connector and power cable temperature differ very little, can guarantee the operate as normal of cable, time, surface oxidation easily took place in permanent power cable connector place, contact resistance is increased gradually, and power cable connector temperature and power cable temperature difference increase, when working temperature reaches more than 60 ℃, the insulating material of power cable connector will accelerated deterioration, adhesion until inefficacy, finally is directed at voltage between phases and punctures and blast.The power of explosion time moment generation is high, can produce excessive temperature and damage the cable of other operate as normal on every side, causes generating plant or electric substation's power failure; Power plant causes the serious accident of compressor emergency shutdown sometimes.
At present, known power cable explosion-proof technology generally adopts the power cable connector place that thermometer is installed, and the artificial method of inspection regularly checks that running time between inspections is long, and personnel labor intensity is big, and often has personnel's electric shock accidents to take place.
Adopt " power cable temperature monitoring system " (patent No.: 91231649.7) of tight outstanding invention, it adopts screw type thermal sensing element thermometer measure precision low, line is many, needs after reporting to the police to check particular location to the scene, can't carry out early diagnosis according to running temperature.
In order to overcome the deficiency of existing power cable explosion-proof technology, the utility model has been developed the explosion-proof on-Line Monitor Device of a kind of power cable, can continual monitoring power cable connector temperature, replace the artificial touring detection that is interrupted, can pinpoint the problems at any time and maintain.
Summary of the invention
The technical scheme in the invention for solving the technical problem is: it is made up of computing machine, telecommunication cable, collector, temperature acquisition cable, integrated digital temperature sensor.Each parallel symmetry in power cable connector surface is installed 2 integrated digital temperature sensors, on the power cable of power cable connector 200mm, 1 integrated digital temperature sensor is installed, by the temperature acquisition cable temperature data is sent into collector, collector links to each other with computing machine by telecommunication cable, and all data are sent into computing machine and handled, show and report to the police.
Computing machine in the utility model adopts PIII level industrial computer.
The DS18B20 integrated digital temperature sensor that integrated digital temperature sensor in the utility model adopts U.S. DALLAS company to produce, be installed in the power cable connector place and apart from power cable connector 200mm place, temperature signal is connected with collector by the temperature acquisition cable.
Collector in the utility model is made of collector main power circuit, watchdog circuit, memory, temperature conversion circuit, cpu circuit, collector auxiliary power circuit, telecommunication circuit, photoelectric isolating circuit.Described main power circuit is by T2 transformer output AC 9V voltage, bridge rectifier circuit rectification through D5, D6, D7, D8 composition, after C6 filtering, after 7805 voltage stabilizings, produce the 5V DC voltage again and supply with cpu circuit, integrated digital temperature sensor, memory, watchdog circuit; Described reset and watchdog circuit adopts integrated circuit MAX813 to be connected with cpu circuit, described cpu circuit adopts the AT89C2051 integrated circuit, it is connected with integrated digital temperature sensor, temperature conversion circuit, memory, watchdog circuit, telecommunication circuit, photoelectric isolating circuit as the central processing unit of collector; Described temperature conversion circuit is made up of socket J5, diode D10 to D15, resistance R 8 to R11, be connected with cpu circuit, described memory is made up of AT24C02, be used to store the ID sign indicating number (each integrated digital temperature sensor all has a unique sign indicating number) of integrated digital temperature sensor, be connected with cpu circuit; Described telecommunication circuit adopts RS485 half-duplex operation mode, is made up of 75176 integrated circuit, and it is isolated by photoelectricity and is connected with CPU; Described photoelectric isolating circuit, it is connected with the communication port of cpu circuit, 75176 integrated circuit of telecommunication circuit; Described collector auxiliary power circuit is made up of D1 to D4, C5, C4, V1, and it is connected with telecommunication circuit.
Wherein, integrated digital temperature sensor (5) is electrically connected the employing unibus structure.
Wherein, adopt photoelectricity to isolate between the temperature conversion circuit (12) of collector (3) and computing machine (1) communication network.
The beneficial effects of the utility model are: owing to adopted advanced integrated digital temperature sensor, the measured temperature accuracy is very high, adopts two parallel being symmetrical arranged of temperature sensor, has guaranteed accuracy and the reliability measured.Contrast integrated digital temperature sensor is set, can grasp the normal working temperature value of power cable simultaneously, can grasp the reduced temperature value of power cable connector temperature and power cable normal temperature again, thereby analyze and grasp the situation of change of power cable connector, find the abnormality of power cable connector temperature rise in advance owing to the temperature rise of contact resistance generation.According to power cable connector temperature rise parameter, guarantee to keep the safety inspection time limit of operate as normal, rationally arrange maintenance schedule, significantly reduce potential safety hazard.Except that daily monitoring, also can be used for the evaluation that carries out an acceptance inspection of quality to the power cable connector of new installation.
The serialization that is measured as of the present utility model, and can store total data with computer recording, can grasp the overall process of temperature variation, by the power cable connector continuous uninterrupted is monitored and data analysis, carry out early diagnosis, become and check to concentrating uninterrupted monitoring artificial regularly the dispersion, effectively prevented the generation of power cable connector explosion accident.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is the power cable connector monitoring synoptic diagram of the explosion-proof on-Line Monitor Device of the utility model power cable
Fig. 2 is a device block scheme of the present utility model
Fig. 3 is the collector circuit theory diagrams
Number in the figure
1, computing machine 2, telecommunication cable 3, collector
4, temperature acquisition cable 5, integrated digital temperature sensor
6, collector main power circuit 7, watchdog circuit
8, memory 9, temperature conversion circuit
10, cpu circuit 11, collector auxiliary power circuit
12, telecommunication circuit 13, photoelectric isolating circuit
14, power cable connector 15, power cable
Embodiment
See also Fig. 1 to Fig. 2, it is made up of computing machine (1), telecommunication cable (2), collector (3), temperature acquisition cable (4), integrated digital temperature sensor (5).The temperature signal that utilizes integrated digital temperature sensor (5) to take out power cable connector (14) is sent into collector (3), after collector (3) is handled, sends into computing machine (1) by telecommunication cable (2) bus and handles, shows and report to the police.Computing machine (1) can give all data the MIS network to make the Monitoring Data resource sharing.Can show the monitoring situation simultaneously by many computing machines (1).
The DS18B20 integrated digital temperature sensor that integrated digital temperature sensor (5) uses U.S. DALLAS company to produce, this integrated digital temperature sensor (5) measurement range is-55 ℃-125 ℃, measuring error between-10 ℃-85 ℃ only is ± 0.5 ℃, the measuring accuracy height; Adopt the unibus numeral to connect and simplify wiring, the signal transmission is undistorted; Adopt the T0-92 package quality little, can be rapidly and power cable connector (14) surface temperature synchronous.
Power cable connector (14) inner structure is that threephase cable is done the insulation processing respectively after crimping, is encapsulated in one with the pyrocondensation pipe box, and diameter is between the Φ 80-Φ 150.A bit be difficult to reflect the actual temperature of three-phase electrical cable joint (14) on the surface, so at parallel 2 the integrated digital temperature sensors (5) that are symmetrical arranged in power cable connector (14) surface, so not only improved the accuracy of measuring, can after indivedual integrated digital temperature sensors (5) damage, can not be interrupted temperature monitoring yet, improve the reliability of monitoring simultaneously yet this power cable connector (14).
Power cable (15) has certain temperature when operate as normal, whether in order to analyze power cable connector (14) temperature is temperature after contact resistance increases, the normal working temperature that needs to measure power cable (15) is provided with 1 integrated digital temperature sensor (5) as reference on the power cable (15) of distance power cable connector (14) 200mm.
Integrated digital temperature sensor (5) adopts the unibus connected mode, and receive on one the 3 core temperature acquisition cable (4), because the influence of line capacitance, digital data transmission has the restriction of distance, in 100 meters distance, can and connect 9 integrated digital temperature sensors (5) through experiment, adopt one 8 core temperature acquisition cable (4), power supply can insert 54 integrated digital temperature sensors (5) jointly, can insert 18 power cable connectors (14).
See also Fig. 3, the I/O mouth of the cpu circuit (10) in integrated digital temperature sensor (5) and the collector (3) is connected, cpu circuit (10) takes out the ID sign indicating number (each integrated digital temperature sensor (5) all has a unique code) of integrated digital temperature sensor (5) from memory (8) AT24C02 by the I2C bus, the ID sign indicating number that dependence is sent out different to the I/O mouth, cpu circuit (10) can communicate with different integrated digital temperature sensors (5) respectively on a bus.Integrated digital temperature sensor (5) after the Temperature numerical after temperature conversion circuit (9) conversion is read in cpu circuit (10), is input to CPU (10) RAM.
When collector (3) energising is started working, send reset signal by watchdog circuit (7) MAX813 to cpu circuit (10), cpu circuit (10) is started working, and to watchdog circuit (7) MAX813 transmission pulse, when program is jumped out normal workflow and is entered endless loop, cpu circuit (10) can stop to send pulse, just can send reset pulse above 1.6 seconds watchdog circuit (7) MAX813 cpu circuit (10) is restarted, and enters normal workflow.
After cpu circuit (10) reads in whole temperature datas, photoelectric coupler isolation by photoelectric isolating circuit (13) is connected with the integrated circuit 75176 of telecommunication circuit (12), transistor emitter pull down resistor control in the optocoupler is adopted in the emission control of the integrated circuit 75176 of telecommunication circuit (12), cpu circuit (10) resets and does not sting bus, telecommunication circuit (12) order wire adopts goes up pull down resistor, improves antijamming capability.75176 of telecommunication circuit (12) is responsible for transferring the Transistor-Transistor Logic level of cpu circuit (10) to the RS-485 level, use twisted pair communications cable (2) to be connected with computing machine (1), master-slave mode multi-computer communication mode is adopted in communication, computing machine (1) is as main frame, each collector (3) all is mounted on the telecommunication cable (2) as slave, controls the communication with it respectively of each slave by computing machine (1), the interior temperature data of collector (3) is read in computing machine (1), show after handling by analysis and report to the police.
Use two cover power supplys in the collector (3), collector main power circuit (6) is for cpu circuit (10), watchdog circuit (7), storage circuit (8), temperature conversion circuit (9) direct current 5V power supply; Collector accessory power supply (11) is specialized in telecommunication circuit (12) direct current 5V power supply; Two overlap independently, and power supply makes communication part and temperature transition partly carry out voltage isolation.
Claims (3)
1, the explosion-proof on-Line Monitor Device of a kind of power cable, comprise computing machine (1), telecommunication cable (2), collector (3), temperature acquisition cable (4), integrated digital temperature sensor (5) is formed, it is characterized in that: the parallel symmetry in power cable connector (14) surface is installed 2 integrated digital temperature sensors (5), go up installation 1 integrated digital temperature sensor (5) apart from the power cable (15) at power cable connector (14) 200mm place, by temperature acquisition cable (4) temperature data is sent into collector (3), collector (3) links to each other with computing machine (1) by telecommunication cable (2); Described collector (3) comprises that collector main power circuit (6), house dog (7), memory (8), temperature conversion circuit (9), cpu circuit (10), collector accessory power supply (11), telecommunication circuit (12), photoelectric isolating circuit (13) constitute, collector main power circuit (6) is connected with cpu circuit (10), integrated digital temperature sensing (5), memory (8), watchdog circuit (7); Cpu circuit (10) is connected with integrated digital temperature sensor (5), temperature conversion circuit (9), memory (8), watchdog circuit (7), telecommunication circuit (12), photoelectric isolating circuit (13); Collector auxiliary power circuit (11) is connected with telecommunication circuit (12).
2, the explosion-proof on-Line Monitor Device of power cable according to claim 1 is characterized in that: integrated digital temperature sensor (5) is electrically connected the employing unibus structure.
3, the explosion-proof on-Line Monitor Device of power cable according to claim 1 is characterized in that: adopt photoelectricity to isolate between the temperature conversion circuit (12) of collector (3) and computing machine (1) communication network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU032001347U CN2599549Y (en) | 2003-01-03 | 2003-01-03 | Electric power cable explosion-proof on-line monitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU032001347U CN2599549Y (en) | 2003-01-03 | 2003-01-03 | Electric power cable explosion-proof on-line monitor |
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| Publication Number | Publication Date |
|---|---|
| CN2599549Y true CN2599549Y (en) | 2004-01-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU032001347U Expired - Fee Related CN2599549Y (en) | 2003-01-03 | 2003-01-03 | Electric power cable explosion-proof on-line monitor |
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| CN (1) | CN2599549Y (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100363726C (en) * | 2005-06-10 | 2008-01-23 | 清华大学 | Method for monitoring and evaluating safe operation of cable and device thereof |
| CN101319938B (en) * | 2008-07-08 | 2010-04-07 | 周骁威 | On-line temperature measurement method and device for cable joint of high-voltage plant |
| CN102610064A (en) * | 2012-04-10 | 2012-07-25 | 苏州苏海亚电气有限公司 | High-temperature alarm with reset function |
| CN102610063A (en) * | 2012-04-10 | 2012-07-25 | 苏州苏海亚电气有限公司 | High-temperature alarm |
| CN103007465A (en) * | 2012-12-04 | 2013-04-03 | 威海北洋电气集团股份有限公司 | High-voltage cable joint comprehensive monitoring and fire protection device and application thereof |
| CN110045229A (en) * | 2019-04-15 | 2019-07-23 | 西南交通大学 | The isolation protecting device of cable termination temperaturing lifting abnormality under a kind of electriferous state |
| CN112673265A (en) * | 2018-09-10 | 2021-04-16 | 3M创新有限公司 | Method and system for monitoring health state of power cable accessory based on machine learning |
-
2003
- 2003-01-03 CN CNU032001347U patent/CN2599549Y/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100363726C (en) * | 2005-06-10 | 2008-01-23 | 清华大学 | Method for monitoring and evaluating safe operation of cable and device thereof |
| CN101319938B (en) * | 2008-07-08 | 2010-04-07 | 周骁威 | On-line temperature measurement method and device for cable joint of high-voltage plant |
| CN102610064A (en) * | 2012-04-10 | 2012-07-25 | 苏州苏海亚电气有限公司 | High-temperature alarm with reset function |
| CN102610063A (en) * | 2012-04-10 | 2012-07-25 | 苏州苏海亚电气有限公司 | High-temperature alarm |
| CN103007465A (en) * | 2012-12-04 | 2013-04-03 | 威海北洋电气集团股份有限公司 | High-voltage cable joint comprehensive monitoring and fire protection device and application thereof |
| CN103007465B (en) * | 2012-12-04 | 2016-06-01 | 威海北洋电气集团股份有限公司 | High-voltage cable joint comprehensively monitoring and fire protection system are applied with it |
| CN112673265A (en) * | 2018-09-10 | 2021-04-16 | 3M创新有限公司 | Method and system for monitoring health state of power cable accessory based on machine learning |
| CN110045229A (en) * | 2019-04-15 | 2019-07-23 | 西南交通大学 | The isolation protecting device of cable termination temperaturing lifting abnormality under a kind of electriferous state |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |