CN201035113Y - High voltage cable temperature on-line monitoring device - Google Patents
High voltage cable temperature on-line monitoring device Download PDFInfo
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- CN201035113Y CN201035113Y CNU2007200222286U CN200720022228U CN201035113Y CN 201035113 Y CN201035113 Y CN 201035113Y CN U2007200222286 U CNU2007200222286 U CN U2007200222286U CN 200720022228 U CN200720022228 U CN 200720022228U CN 201035113 Y CN201035113 Y CN 201035113Y
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Abstract
Provided is a high voltage cable temperature on-line detection device which belongs to the detecting device. The utility model comprises a power module, a display module, a signal processing module, a sensor receiving module and a communication module. The signal processing module is respectively connected with the power module, the display module, the sensor receiving module and the communication module. The sensor receiving module converts the signals of the temperature sensor receiving module into signals that can be received by the signal processing module. After processing the signals, the signal processing module transmits the results to the display module for displaying. Through the communication between the communication module and the detection computer, the signals are uploaded to the detection computer with a detection software so as to realize high voltage cable temperature on-line detection. The utility model can display the working state of each collecting site directly and promptly and the historical curve search of each detection point. Besides, the utility model can set the alarming temperature values and alarm through sound and light.
Description
Technical field
The utility model relates to a kind of pick-up unit, particularly a kind of high-tension cable temperature on-line monitoring device that is applied to.
Background technology
Present needs for urban construction, as the feeder cable of electric power main line much from electric pole then put into underground pipeline, because electric power is the important energy source in a city, its reliable, safety have crucial effects for the people's life and production.And high-tension cable is long-term in service, may be because insulation ag(e)ing form shelf depreciation, and local discharge and then cause vicious cycle to lead to cable blast and fire.Now for operating high-tension cable being carried out the monitoring of safe operation, installed and used equipment such as infrared thermometer, infrared imaging instrument, temperature sensing cable, temperature sampling point type thermometric at some important nodes, but they can't prevent also and possible trouble for the feeder cable of growing distance.Generally be could report to the police after having an accident, the Monitoring Data record before the accident free in service of cable, the forecast before the accident free.
Present existing cable temperature on-line monitoring much is to adopt constant temperature type temperature sensing cable thermometric, distributed optical fiber temperature measurement or fiber Bragg grating type thermometric.Constant temperature type temperature sensing cable thermometric records the temperature out of true and the cable heating position be can not determine, is subjected to the influence of environment, and the situation that wrong report takes place is more, to the maintenance inconvenience of cable.Distribution type fiber-optic formula thermometric or fiber Bragg grating type thermometric belong to external imported technology, thermometric accurately but the cost height, maintenance cost is big, is unfavorable for doing large scale application.
The utility model content
The purpose of this utility model provides a kind of reliability height, cheap high-tension cable temperature online product, by continuous temperature measurement to cable splice or cable itself, can predict the fault trend of cable end or cable itself, in time provide cable fault position and maintenance to instruct, avoid taking place major accident.
The technical scheme that its technical matters that solves the utility model adopts is: the high-tension cable temperature on-line monitoring device, it is characterized in that: comprise power module, display module, signal processing module, sensor receiver module and communication module, signal processing module links to each other with communication module with power module, display module, sensor receiver module respectively, and communication module links to each other with signal processing module.
Principle of work: the signal that the sensor receiver module of temperature monitoring becomes the conversion of signals of temperature sensor receiver module signal processing module to receive, signal processing module information processing after, result is passed to display module, be used for display result, and by communication module and supervisory control comuter communication, be uploaded to the supervisory control comuter that monitoring software is installed, realize the high-tension cable on-line temperature monitoring.
Display module is used to show that the state that sequence number, cable temperature and the external switch amount of monitoring point insert shows.Signal processing module mainly is that the signal of sensor receiver module is handled, and shows on LED display by display module, uploads to computing machine by communication module.The sensor receiver module comprises that the temperature signal of gathering cable uploads the access two parts with the external switch amount, is used for the acceptance test signal.Power module adopts common external power supply, and its function is to be circuit supply by Switching Power Supply.
Described sensor receiver module is made up of sensor signal receiving unit and external switch amount receiving unit, comprise external sensor, variable resistor R1, R2, resistance R 3-R12, diode D1-D4, bus transceiver U1, U9, exclusion RP1, photoelectrical coupler U5-U8 and interface XS1, the sensor signal receiving unit adopts external sensor connecting interface XS1,1 pin of interface XS1,4 pin are received 15 pin of bus transceiver U1,14 pin, and 15, pass through two variable resistor R1 on 14 pin, R2 connects 2 VCC respectively, 1 pin of bus transceiver U1,5 pin and 6 pin are received the input end of signal processing module respectively, and external switch amount receiving unit adopts 16 pin of interface XS1,13 pin, 12 pin and 9 pin are connected to the 18-15 pin of bus transceiver U9 respectively by photoelectrical coupler U5-U8, the 18-15 pin of bus transceiver U9 connects+5V voltage by exclusion RP1,19 pin of bus transceiver U9 connect the control end of signal processing module, and 2 pin-5 pin connects the input end of signal processing module.The sensor signal receiving unit of sensor receiver module and external switch amount receiving unit are delivered to signal processing module with external signal respectively.
Described signal processing module comprises single-chip microcomputer U2, watchdog circuit U3, button AN1-AN3, passage is provided with interface SN1, interface XS2, crystal oscillator G1, resistance R 3-R8 and capacitor C 1, C2,13 pin of single-chip microcomputer U2,12 pin connect 6,5 pin of the bus transceiver U1 of sensor receiver module, and 19 pin are connected with 18 pin by crystal oscillator G1 and capacitor C 1, the clock circuit that C2 forms, 9 pin connect 7 pin of watchdog circuit U3,9 pin also connect VCC by resistance R 7, the DQ end of 8 pin connecting interface SN1, and 5 pin-7 pin is respectively by button AN1-AN3 ground connection, 5 pin-7 pin also connects VCC by resistance R 3-R5 respectively, 5 pin-7 pin is also distinguished 1 pin-3 pin of connecting interface XS2, and 31 pin connect VCC by resistance R 6, and 3 pin of watchdog circuit U3 connect VCC by resistance R 8.See that doorway circuit U 3 is used for resetting when hardware and software is made mistakes.It is selector channel that three button AN1-AN3 are set to SEL respectively, and ADD adds, and ENT confirms passage, is used for the passage of sensor signal input is selected and is provided with.The function of signal processing module mainly is to be used for the input signal that the processes sensor receiver module transmits, and then result is sent to display module and shows, perhaps uploads to computing machine by communication module.
Described display module comprises relay J D1, JD2, triode Q1, Q2, LED 1-LED4, driver U11, latch U10, resistance R 13-R19, interface XS4, XS5 and charactron VT1 form, 2 pin-9 pin of latch U10 connects the output terminal in the signal processing module, 12 pin connect the 12 pin control ends of driver U11,14 pin connect by triode Q2 by resistance R 14, the warning circuit that relay J D2 and interface XS5 form, 15 pin connect by triode Q1 by resistance R 13, the warning circuit that relay J D1 and interface XS4 form, 16 pin-19 pin connects the indicator light circuit of being made up of resistance R 15-R18 and LED 1-LED4 respectively, and driver U11 connects charactron VT1.Driver U11 is an eight digit number sign indicating number pipe driver, can connect 8 charactron VT1 simultaneously, and itself and being connected to of charactron have ordinary skill commonly used now.Eight digit number sign indicating number pipe driver U11 drives the temperature that charactron VT1 shows monitoring by the signal of latch U10 reception from single-chip microcomputer U2.Indicator light circuit is used to show the state of external switch amount.
Described communication module comprises bus transceiver U4 and interface XS3, and the R end of bus transceiver U4 is held with RXD end and TXD that the D end is connected the single-chip microcomputer U2 of signal processing module respectively, and the side a and b of bus transceiver U4 is 2 pin and 3 pin of connecting interface XS3 respectively.Bus transceiver U4 adopts differential bus transceiver 75176, is signal transition that difference modes receives outer computer.
Described power module is common prior art.
By in the distributed embedding cable of temperature sensor, form a temperature acquisition cable, temperature sensor links to each other with temperature monitoring.
Compared with prior art, the beneficial effect that the utility model high-tension cable temperature on-line monitoring device is had is: the signal that the sensor receiver module becomes the conversion of signals of temperature sensor receiver module signal processing module to receive, signal processing module information processing after, result is passed to display module, be used for display result, and, be uploaded to the supervisory control comuter that monitoring software is installed by communication module and supervisory control comuter communication, realize the high-tension cable on-line temperature monitoring.Owing to pass through in the distributed embedding cable of temperature sensor, form the temperature acquisition cable, the temperature acquisition cable links to each other with temperature monitoring, and employing current advanced mechanics of communication, microprocessor technology, digital temperature sensing technology, ionic smoke sensor technology and low temperature, highfield, wet environment running technology, avoid the interference of strong electric field in the cable duct, complete safety data have been sent to supervisory control comuter.Monitoring software is installed on the supervisory control comuter, and the interface simulation field condition can be intuitively, the duty of real-time each collection point of demonstration and the history curve inquiry of each measuring point, and can set the alarm temperature value, reports to the police by sound, light.The temperature acquisition cable uses the transmission of unibus data mode, and has avoided the interference of strong-electromagnetic field environment, has reduced the cost of single point for measuring temperature again, and thermometric is counted expansion flexibly.
Description of drawings
Fig. 1 is a functional-block diagram of the present utility model,
Fig. 2 is the functional-block diagram of temperature monitoring of the present utility model,
Fig. 3 is sensor receiver module, signal processing module and the communication module circuit theory diagrams of temperature monitoring of the present utility model,
Fig. 4 is the display module circuit theory diagrams of temperature monitoring of the present utility model,
Wherein, R1, R2, variable resistor R3-R19, resistance D1-D4, diode U1, U4, U9, bus transceiver RP1, exclusion U5-U8, photoelectrical coupler XS1-XS5, interface G1 crystal oscillator C1, C2, electric capacity U2, single-chip microcomputer U3, watchdog circuit AN1-AN3, button SN1 passage are provided with interface JD1, JD2, relay Q1, Q2, triode LED1-LED4, light emitting diode U11, driver U10, latch VT1, charactron.
Embodiment
Below in conjunction with accompanying drawing the utility model embodiment is described further.
As shown in Figure 1: temperature monitoring is by power module, display module, and signal processing module, sensor receiver module and communication module are formed, and signal processing module links to each other with communication module with power module, display module, sensor receiver module respectively.
Principle of work: the signal that the sensor receiver module of temperature monitoring becomes the conversion of signals of temperature sensor receiver module signal processing module to receive, signal processing module information processing after, result is passed to display module, be used for display result, and by communication module and supervisory control comuter communication, be uploaded to the supervisory control comuter that monitoring software is installed, realize the high-tension cable on-line temperature monitoring.
Display module is used to show that the state that sequence number, cable temperature and the external switch amount of monitoring point insert shows.Signal processing module mainly is that the signal of sensor receiver module is handled, and shows on LED display by display module, uploads to computing machine by communication module.The sensor receiver module comprises that the temperature signal of gathering cable uploads the access two parts with the external switch amount, is used for the acceptance test signal.Power module adopts common external power supply, and its function is to be circuit supply by Switching Power Supply.
Shown in Fig. 2-3: the power module of temperature monitoring, display module, signal processing module, the circuit theory diagrams of sensor receiver module and communication module.
The sensor receiver module is made up of sensor signal receiving unit and external switch amount receiving unit, comprises external sensor, variable resistor R1, R2, resistance R 3-R12, diode D1-D4, bus transceiver U1, U9, exclusion RP1, photoelectrical coupler U5-U8 and interface XS1.The sensor signal receiving unit of sensor receiver module and external switch amount receiving unit are delivered to signal processing module with external signal respectively.
The sensor signal receiving unit adopts external sensor connecting interface XS1,1 pin of interface XS1,4 pin are received 15 pin, 14 pin of bus transceiver U1, and 15, connect 2 VCC respectively by two variable resistor R1, R2 on 14 pin, 1 pin of bus transceiver U1,5 pin and 6 pin are received the input end of signal processing module respectively.Thereby the signal that receives from temperature sensor passed to carry out signal Processing the signal processing module.
External switch amount receiving unit adopts 16 pin, 13 pin, 12 pin and 9 pin of interface XS1 to be connected to the 18-15 pin of bus transceiver U9 respectively by photoelectrical coupler U5-U8, the 18-15 pin of bus transceiver U9 connects+5V voltage by exclusion RP1,19 pin of bus transceiver U9 connect the control end of signal processing module, and 2 pin-5 pin connects the input end of signal processing module.
The function of signal processing module mainly is to be used for the input signal that the processes sensor receiver module transmits, and then result is sent to display module and shows, perhaps uploads to computing machine by communication module.Comprise single-chip microcomputer U2, watchdog circuit U3, button AN1-AN3, passage are provided with interface SN1, interface XS2, crystal oscillator G1, resistance R 3-R8 and capacitor C 1, C2.6 of the bus transceiver U1 of 13 pin of single-chip microcomputer U2,12 pin connection sensor receiver module, 5 pin, 19 pin are connected the clock circuit of being made up of crystal oscillator G1 and capacitor C 1, C2 with 18 pin, 9 pin connect 7 pin of watchdog circuit U3,9 pin also connect VCC by resistance R 7, the DQ end of 8 pin connecting interface SN1,5 pin-7 pin is respectively by button AN1-AN3 ground connection, 5 pin-7 pin also connects VCC by resistance R 3-R5 respectively, 5 pin-7 pin is also distinguished 1 pin-3 pin of connecting interface XS2, and 31 pin connect VCC by resistance R 6.Single-chip microcomputer U2 adopts AT89C55.
3 pin of watchdog circuit U3 connect VCC by resistance R 8.See that doorway circuit U 3 is used for resetting when hardware and software is made mistakes.
It is selector channel that three button AN1-AN3 are set to SEL respectively, and ADD adds, and ENT confirms passage, is used for the sequence number of sensor is selected and is provided with, and the signal that is convenient to a plurality of sensors receives and can not produce and interfere with each other.
The effect of display module is that the data that CPU handles are shown by charactron and pilot lamp; Wherein pilot lamp is that the state that the external switch amount inserts shows; Charactron then shows the sequence number and the temperature of check point.Relay then is to occur reporting to the police under the unusual overview when cable.Comprise relay J D1, JD2, triode Q1, Q2, LED 1-LED4, driver U11, latch U10, resistance R 13-R19, interface XS4, XS5 and charactron VT1.2 pin-9 pin of latch U10 connects the output terminal in the signal processing module, 12 pin connect the 12 pin control ends of driver U11,14 pin connect the warning circuit of being made up of triode Q2, relay J D2 and interface XS5 by resistance R 14,15 pin connect the warning circuit of being made up of triode Q1, relay J D1 and interface XS4 by resistance R 13, and 16 pin-19 pin connects the indicator light circuit of being made up of resistance R 15-R18 and LED 1-LED4 respectively.Indicator light circuit is used to show the state of external switch amount.
Driver U11 is eight digit number sign indicating number pipe driver MAX7219, can connect 8 charactron VT1 simultaneously, and itself and being connected to of charactron have ordinary skill commonly used now.Eight digit number sign indicating number pipe driver U11 drives the temperature that charactron VT1 shows monitoring by the signal of latch U10 reception from single-chip microcomputer U2.
Communication module comprises bus transceiver U4 and interface XS3, and the R end of bus transceiver U4 is held with RXD end and TXD that the D end is connected the single-chip microcomputer U2 of signal processing module respectively, and the side a and b of bus transceiver U4 is 2 pin and 3 pin of connecting interface XS3 respectively.Bus transceiver U4 adopts differential bus transceiver 75176, is signal transition that difference modes receives outer computer.
Power module is common prior art.
The course of work: the electric signal that the temperature sensor of gathering cable temperature is detected, exporting eight bus transceiver U1 chips by three-state is sent to single-chip microcomputer U2 and handles, (represent SEL respectively by button AN1-AN3, ADD, ENT) select and confirm sensor sequence number, the access of external switch amount can be monitored the situation of external environment condition, as intrusion detection of the naked light smoke monitoring of cable duct, immersion monitoring, toy or the like.Export eight bus transceiver U9 by three-state and pass to single-chip microcomputer U2, single-chip microcomputer U2 drives the result after handling 8 charactrons and drives indicator light circuit by being connected latch U10 by eight digit number sign indicating number pipe driver U11, and the result who handles is shown.When abnormal conditions occurring, triode Q1, Q2 conducting drive relay J D1, JD2 and report to the police.Single-chip microcomputer U2 connects by differential bus transponder chip U4 and supervisory control comuter.
As shown in Figure 4,, form a temperature acquisition cable, gather cable and link to each other with temperature monitoring by in the distributed embedding cable of temperature sensor.The output terminal of temperature sensor connects the input end of temperature monitoring, and temperature monitoring connects supervisory control comuter by bus.
The distributed embedding temperature acquisition of temperature sensor cable.Temperature monitoring can also connect supervisory control comuter by optical cable or other communication modes.Many temperature monitorings connect supervisory control comuter by communication network.Monitoring software is installed on the supervisory control comuter, and the interface simulation field condition can be intuitively, the duty of real-time each collection point of demonstration and the history curve inquiry of each measuring point, and can set the alarm temperature value, reports to the police by sound, light.The temperature acquisition cable uses the transmission of unibus data mode, and has avoided the interference of strong-electromagnetic field environment, has reduced the cost of single point for measuring temperature again, and thermometric is counted expansion flexibly.
Claims (5)
1. high-tension cable temperature on-line monitoring device, it is characterized in that: comprise power module, display module, signal processing module, sensor receiver module and communication module, signal processing module link to each other with communication module with power module, display module, sensor receiver module respectively.
2. high-tension cable temperature on-line monitoring device according to claim 1, it is characterized in that: display module comprises relay J D1, JD2, triode Q1, Q2, LED 1-LED4, driver U11, latch U10, resistance R 13-R19, interface XS4, XS5 and charactron VT1 form, 2 pin-9 pin of latch U10 connects the output terminal in the signal processing module, 12 pin connect the 12 pin control ends of driver U11,14 pin connect by triode Q2 by resistance R 14, the warning circuit that relay J D2 and interface XS5 form, 15 pin connect by triode Q1 by resistance R 13, the warning circuit that relay J D1 and interface XS4 form, 16 pin-19 pin connects the indicator light circuit of being made up of resistance R 15-R18 and LED 1-LED4 respectively, and driver U11 connects charactron VT1.Driver U11 is an eight digit number sign indicating number pipe driver, can connect 8 charactron VT1 simultaneously, and itself and being connected to of charactron have ordinary skill commonly used now.Eight digit number sign indicating number pipe driver U11 drives the temperature that charactron VT1 shows monitoring by the signal of latch U10 reception from single-chip microcomputer U2.Indicator light circuit is used to show the state of external switch amount.
3. high-tension cable temperature on-line monitoring device according to claim 1, it is characterized in that: signal processing module comprises single-chip microcomputer U2, watchdog circuit U3, button AN1-AN3, passage is provided with interface SN1, interface XS2, crystal oscillator G1, resistance R 3-R8 and capacitor C 1, C2,13 pin of single-chip microcomputer U2,6 of the bus transceiver U1 of 12 pin connection sensor receiver module, 5 pin, 19 pin are connected with 18 pin by crystal oscillator G1 and capacitor C 1, the clock circuit that C2 forms, 9 pin connect 7 pin of watchdog circuit U3, and 9 pin also connect VCC by resistance R 7, the DQ end of 8 pin connecting interface SN1,5 pin-7 pin is respectively by button AN1-AN3 ground connection, and 5 pin-7 pin also connects VCC by resistance R 3-R5 respectively, and 5 pin-7 pin is also distinguished 1 pin-3 pin of connecting interface XS2,31 pin connect VCC by resistance R 6, and 3 pin of watchdog circuit U3 connect VCC by resistance R 8.See that doorway circuit U 3 is used for resetting when hardware and software is made mistakes.It is selector channel that three button AN1-AN3 are set to SEL respectively, and ADD adds, and ENT confirms passage, is used for the passage of sensor signal input is selected and is provided with.The function of signal processing module mainly is to be used for the input signal that the processes sensor receiver module transmits, and then result is sent to display module and shows, perhaps uploads to computing machine by communication module.
4. high-tension cable temperature on-line monitoring device according to claim 1, it is characterized in that: the sensor receiver module is made up of sensor signal receiving unit and external switch amount receiving unit, comprise external sensor, variable resistor R1, R2, resistance R 3-R12, diode D1-D4, bus transceiver U1, U9, exclusion RP1, photoelectrical coupler U5-U8 and interface XS1, the sensor signal receiving unit adopts external sensor connecting interface XS1,1 pin of interface XS1,4 pin are received 15 pin of bus transceiver U1,14 pin, and 15, pass through two variable resistor R1 on 14 pin, R2 connects 2 VCC respectively, 1 pin of bus transceiver U1,5 pin and 6 pin are received the input end of signal processing module respectively, external switch amount receiving unit adopts 16 pin of interface XS1,13 pin, 12 pin and 9 pin are connected to the 18-15 pin of bus transceiver U9 respectively by photoelectrical coupler U5-U8, the 18-15 pin of bus transceiver U9 connects+5V voltage by exclusion RP1,19 pin of bus transceiver U9 connect the control end of signal processing module, and 2 pin-5 pin connects the input end of signal processing module.The sensor signal receiving unit of sensor receiver module and external switch amount receiving unit are delivered to signal processing module with external signal respectively.
5. high-tension cable temperature on-line monitoring device according to claim 1, it is characterized in that: communication module comprises bus transceiver U4 and interface XS3, the R end of bus transceiver U4 is held with RXD end and TXD that the D end is connected the single-chip microcomputer U2 of signal processing module respectively, and the side a and b of bus transceiver U4 is 2 pin and 3 pin of connecting interface XS3 respectively.Bus transceiver U4 adopts differential bus transceiver 75176, is signal transition that difference modes receives outer computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200222286U CN201035113Y (en) | 2007-05-15 | 2007-05-15 | High voltage cable temperature on-line monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200222286U CN201035113Y (en) | 2007-05-15 | 2007-05-15 | High voltage cable temperature on-line monitoring device |
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| CN201035113Y true CN201035113Y (en) | 2008-03-12 |
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| CNU2007200222286U Expired - Fee Related CN201035113Y (en) | 2007-05-15 | 2007-05-15 | High voltage cable temperature on-line monitoring device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102411119A (en) * | 2011-11-21 | 2012-04-11 | 合肥工业大学 | Intelligent monitoring device for temperature and insulation state of 330KV high-voltage cable in hydropower station |
| WO2012062022A1 (en) * | 2010-11-11 | 2012-05-18 | 浙江图维电力科技有限公司 | On-line detection device for inner temperature of power cable joint based on radio frequency technology and method thereof |
| CN102636274A (en) * | 2012-04-28 | 2012-08-15 | 四川省电力公司自贡电业局 | Intelligent temperature monitoring system of crosslinked polyethylene XLPE power cable |
| CN101750572B (en) * | 2009-12-15 | 2012-10-03 | 天津市电力公司 | Real-time safety monitoring method and system for high-voltage underground long-distance power supply cable |
-
2007
- 2007-05-15 CN CNU2007200222286U patent/CN201035113Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101750572B (en) * | 2009-12-15 | 2012-10-03 | 天津市电力公司 | Real-time safety monitoring method and system for high-voltage underground long-distance power supply cable |
| WO2012062022A1 (en) * | 2010-11-11 | 2012-05-18 | 浙江图维电力科技有限公司 | On-line detection device for inner temperature of power cable joint based on radio frequency technology and method thereof |
| EA023311B1 (en) * | 2010-11-11 | 2016-05-31 | Чжецзян Тувэй Электрисити Текнолоджи Ко., Лтд. | Method and device for precisely measuring temperature of cable joint on the basis of radio frequency technique |
| CN102411119A (en) * | 2011-11-21 | 2012-04-11 | 合肥工业大学 | Intelligent monitoring device for temperature and insulation state of 330KV high-voltage cable in hydropower station |
| CN102411119B (en) * | 2011-11-21 | 2013-09-18 | 合肥工业大学 | Intelligent monitoring device for temperature and insulation state of 330KV high-voltage cable in hydropower station |
| CN102636274A (en) * | 2012-04-28 | 2012-08-15 | 四川省电力公司自贡电业局 | Intelligent temperature monitoring system of crosslinked polyethylene XLPE power cable |
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Granted publication date: 20080312 |