CN203561449U - A buried cable intermediate connector temperature online monitoring system - Google Patents
A buried cable intermediate connector temperature online monitoring system Download PDFInfo
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- CN203561449U CN203561449U CN201320569776.6U CN201320569776U CN203561449U CN 203561449 U CN203561449 U CN 203561449U CN 201320569776 U CN201320569776 U CN 201320569776U CN 203561449 U CN203561449 U CN 203561449U
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Abstract
The utility model relates to a power cable temperature online monitoring system and specifically to a buried cable intermediate connector temperature online monitoring system. The monitoring system is composed of wireless sensing nodes, thermoelectric generators (TEG), and wireless temperature-measuring collector. Buried cable intermediate connectors are arranged under cable wells. The wireless sensing nodes and the TEGs are installed on the outer surfaces of the buried cable intermediate connectors. The wireless temperature-measuring collector are installed on a cable terminal, or a switching station, ring main unit, or cable branch box at a branch connector. An antenna is extended to a cable trench in order to collect data monitored by the wireless sensing node. According to the buried cable intermediate connector temperature online monitoring system, the TEGs and the wireless temperature-measuring collector are used to convert temperature difference into electric energy to be supplied to wireless sensors and monitored data is acquired wirelessly. The wireless sensing nodes operate in a low power consumption manner so as to decrease the power consumption of the whole monitoring system.
Description
Technical field
The utility model relates to a kind of Temperature of Power Cables on-line monitoring system, specifically relates to a kind of underground cable Joint Temperature on-line monitoring system.
Background technology
Along with the development of urbanization and urban distribution network, power cable is used widely, and in China, average year increment reaches 35%.Along with the increase of cable usage quantity, the raising of transmission line capability, once the harm of breaking down is serious, so the operational reliability of power cable more and more comes into one's own.By discovery that Our Country Primary Cities power cable operation troubles rate is investigated, in 5～25 years in 1～5 year of cable initial stage operation and after putting into operation, the failure rate of electric cable fitting (comprising take-off connection, no-go sub and intermediate head) is the highest always.Especially the requirement of cable intermediate joint manufacture craft is high, exists the possibility of accident potential larger, and the on-line monitoring that therefore it is carried out to temperature is significant.
Existing cable on-line temperature monitoring method comprises point type thermometry and line formula thermometry.1) conventional port thermometry adopts thermopair, thermal resistance, thermistor equitemperature sensor measurement intermediate head containment vessel outside surface or cable body surface of outer sheath partial points temperature, and its monitoring device generally uses battery or the power supply of electromagnetic induction electricity getting device.If employing powered battery, its at high temperature easily explosion, and need to regularly replace battery, maintenance workload is large.While adopting the power supply of electromagnetic induction electricity getting device, if electric current is less in cable, electric energy cannot take out, and monitoring device quits work; If cable current is larger, easily burn out monitoring device.When monitoring triple cable, electromagnetic induction electricity getting device cannot be worked.2) line formula thermometry generally adopt temperature sensing cable, distributed optical fiber temperature sensor, fiber-optical grating temperature sensor along cable line colligation on cable jacket surface (or being embedded in cable inside), measure cable temperature completely.The method is applicable to measure cable temperature trend and hot bottleneck region completely, but length is high apart from laid down cost, installation work is huge.
Utility model content
, the power problems such as difficulty, installation and maintenance difficulties large high for existing cable intermediate head on-line monitoring system cost, the purpose of this utility model is to provide a kind of underground cable Joint Temperature on-line monitoring system, the utility model adopts wireless senser to measure cable intermediate joint exocuticle temperature, with wireless way for transmitting Monitoring Data, and utilize thermoelectric generator and energy harvester to convert the temperature difference to electric energy and power for wireless senser, have that cost is low, non-maintaining, easy for installation, safe coefficient advantages of higher.
The purpose of this utility model is to adopt following technical proposals to realize:
The utility model provides a kind of underground cable Joint Temperature on-line monitoring system, described system comprises N wireless sensing node, thermoelectric generator and the wireless temperature measurement manifold that is arranged at the aboveground side of cable work, its improvements are, cable intermediate joint is arranged at cable work downhole, and single wireless sensing node and thermoelectric generator are installed on the outside surface of cable intermediate joint successively side by side; Described wireless temperature measurement manifold is installed in switching station, ring main unit or the cable branch box of cable termination, take-off connection, and its Antenna extender is collected the Monitoring Data of wireless sensor node to conduit line.
Preferably, the side that described thermoelectric generator temperature is high sticks on cable intermediate joint exocuticle, and the side that temperature is low is diffused into hot-fluid in air by heating radiator; Between adjacent cable intermediate head, distance is 100～400 meters.
Preferably, described single wireless sensor node comprises and connects successively energy harvester, microcontroller and the first wireless transceiver, and semiconductor temperature sensor is connected with microcontroller; Semiconductor temperature sensor and the first wireless transceiver all obtain power supply by the VOUT pin of microcontroller.
More preferably, described energy harvester comprises collection of energy managing chip, miniature transformer, super capacitor and capacitor; Described miniature transformer, super capacitor and capacitor are all connected on collection of energy managing chip.
More preferably, the sensor of described semiconductor temperature sensor employing TMP36 model.
More preferably, the inner integrated analog digit converter of described microcontroller, timer, general purpose I/O, interruptable controller On-Chip peripheral;
Microcontroller is connected with the first wireless transceiver by serial peripheral SPI interface, and utilizes general purpose I/O to export to close or off signal SDN controls electrification reset and the working power of the first wireless transceiver.
More preferably, utilizing thermoelectric generator and energy harvester to convert the temperature difference of cable intermediate joint and environment to electric energy, is described wireless sensor node power supply.
Preferably, described wireless temperature measurement manifold, by the civil power in switching station, ring main unit or cable branch box, PT power supply or storage battery power supply, comprises microprocessor, the second wireless transceiver, GPRS module/fiber optic Ethernet interface, LCD display, radio circuit and antenna; Described the second wireless transceiver, GPRS module/fiber optic Ethernet interface are connected with microprocessor respectively with LCD display, and described antenna is connected with the second wireless transceiver by radio circuit.
Preferably, the frequency range of described wireless sensor node and wireless temperature measurement manifold radio communication is 433MHz, and communication protocol is IEEE802.15.4g, and authenticates by key.
Compared with the prior art, the beneficial effect that the utility model reaches is:
1. in the underground cable Joint Temperature on-line monitoring system that the utility model provides, its wireless sensor node adopts thermoelectric generator TEG and energy harvester power supply, avoided laying the huge workload of special-purpose service cable or periodic replacement battery, get rid of potential safety hazard and unreliability because adopting electromagnetic induction electricity getting device power supply station to bring simultaneously, there is non-maintaining, easy for installation, low cost and other advantages;
2. between the wireless sensor node in the utility model and wireless temperature measurement manifold, adopt wireless way for transmitting data, removed the extra communications cable from, simultaneity factor anti-electromagnetic interference capability is strong;
3. the wireless sensor node in the utility model is with very low dutycycle work, and its data upload has adopted the mode of pointwise collection, thereby has reduced system power dissipation;
4. the utility model utilizes energy collection technology that used heat is converted to the required electric energy of wireless sensor node work, has played the effect of energy-conserving and environment-protective.
Accompanying drawing explanation
Fig. 1 is the structural drawing of the underground cable Joint Temperature on-line monitoring system that provides of the utility model;
Fig. 2 is the wireless sensor node structure principle chart that the utility model provides.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in further detail.
, the power problems such as difficulty, installation and maintenance difficulties large high for existing cable intermediate head on-line monitoring system cost, it is wireless senser power supply that the utility model adopts thermoelectric generator and energy harvester to convert the temperature difference to electric energy, gathers Monitoring Data with wireless mode simultaneously; Wireless senser is worked in low-power consumption mode, thereby has reduced the power consumption of whole monitoring system.
As shown in Figure 1, this temperature online monitoring system comprises that at least one wireless sensing node, thermoelectric generator (TEG), wireless temperature measurement manifold and background monitoring center (main website) that is arranged at the aboveground side of cable work forms to the structural drawing of the underground cable Joint Temperature on-line monitoring system that the utility model provides.Wherein underground cable intermediate head is positioned at cable work downhole, and the distance of adjacent joint is 100～400 meters; Each wireless sensor node and thermoelectric generator are arranged on cable center tap outside surface successively side by side; Wireless temperature measurement manifold is installed in switching station, ring main unit or the cable branch box at cable termination or take-off connection place, its Antenna extender is collected the Monitoring Data of wireless sensor node to conduit line, and it is sent to background monitoring center by GPRS or optical fiber.
One) thermoelectric generator TEG:
Thermoelectric generator TEG application Seebeck effect (Seebeck Effect) can be converted to voltage by the temperature difference of its both sides, and the amplitude of output voltage and polarity depend on amplitude and the polarity of temperature difference.The side that thermoelectric generator temperature is high sticks on cable intermediate joint exocuticle, and the side that temperature is low is diffused into hot-fluid in air by heating radiator, to guarantee that thermoelectric generator both sides form the temperature difference.
Two) wireless sensor node: formed by energy harvester, microcontroller, the first wireless transceiver and semiconductor temperature sensor, wherein, energy harvester, microcontroller and the first wireless transceiver are connected successively, semiconductor temperature sensor is connected with microcontroller, and its structure principle chart as shown in Figure 2.
<1> energy harvester mainly comprises collection of energy managing chip LTC3108, miniature transformer T1(model: LPR6235-752SMLB), super capacitor and other capacitors.Energy harvester can be converted to the voltage (2.2V, 3.3V) that microcontroller, the first wireless transceiver and semiconductor temperature sensor can be worked by the voltage (20mV～500mV) of TEG output, when output voltage VO UT reach preset value 93% time just to microcontroller, export effective PGOOD signal, super capacitor is charged to 5.25V simultaneously.When the voltage of TEG output is during lower than 20mV, super capacitor starts electric discharge, and is that microcontroller, the first wireless transceiver and semiconductor temperature sensor are powered by LTC3108.
<2> semiconductor temperature sensor TMP36 is converted to analog voltage signal by temperature signal, and exports microcontroller to.When it is operated in normal mode, working current is less than 50 μ A; When it is during in " shut " mode", working current is less than 0.5 μ A.
<3> microcontroller is the control center of whole wireless sensor node, the On-Chip peripherals such as its inner integrated ADC, timer, general purpose I/O, interruptable controller.Microcontroller is connected with the first wireless transceiver SI4463 by SPI interface, and utilizes electrification reset and the working power of general purpose I/O output SDN signal controlling the first wireless transceiver.Microcontroller start by set date ADC is converted to digital signal by temperature analog signal, and sends Monitoring Data by the first wireless transceiver.When not carrying out A/D conversion, microcontroller just sets low the #SHDN signal of exporting to temperature sensor, to reduce the power consumption of temperature sensor, forbids the first wireless transceiver sending function simultaneously.For the reception of data, adopt listen mode, the average current consuming to reduce wireless transceiver.Microcontroller just enters park mode when idle, and its working current can be down to 1 μ A, and allows timer to interrupt waking up device.Because microcontroller and the first wireless transceiver are with lower dutycycle work, so its average power consumption is very low, is several milliwatts left and right.
Three) wireless temperature measurement manifold: by the civil power in switching station/ring main unit/cable branch box, PT power supply or storage battery power supply, comprise microprocessor, the second wireless transceiver, GPRS module/fiber optic Ethernet interface, LCD display, radio frequency (RF) circuit, antenna etc.Wherein, wireless transceiver, GPRS module/fiber optic Ethernet interface are connected with microprocessor respectively with LCD display, and antenna is connected with the second wireless transceiver by radio frequency (RF) circuit.
The function of wireless temperature measurement manifold comprises: collect parameter, the reception of this locality demonstration of temperature data that in conduit line, wireless sensor node is uploaded, temperature data and alarm, configuration wireless sensor node and carry out Surveillance center order, upload Monitoring Data etc.
In the monitoring system that the utility model provides, the frequency range of wireless sensor node and wireless temperature measurement collector radio communication is 433MHz, and communication protocol is IEEE802.15.4g, and authenticates by key.
The utility model also provides a kind of monitoring method of underground cable Joint Temperature on-line monitoring, comprises the steps:
(1) thermoelectric generator TEG is converted to voltage signal by the temperature difference of its both sides and exports energy harvester to.Energy harvester is converted to the voltage that microcontroller and the first wireless transceiver can be worked, the average power P of its output by faint voltage (20～500mV)
oUTwhen TEG temperature difference is 5 ℃, approximately the concrete numerical value of 1.5～2.5mW(depends on the parameter of TEG).Due to P in most cases
oUTcan not maintain wireless sensor node and be operated under normal mode always, so this node can only be with certain dutycycle work.The capacitor C of the output terminal of energy harvester
oUTcan guarantee V after wireless sensor node is with peak power work a period of time
oUTcan not fall to below normal work.C
oUTvalue can be determined by following formula:
C
OUT＝I
PULSE*t
PULSE/ΔV
OUT；
Wherein: I
pULSEand t
pULSEbe respectively maximum operating currenbt and the corresponding working time thereof of wireless sensor node, Δ V
oUTfor V
oUTthe maximum pressure drop that output terminal allows.
If power consumption when wireless sensor node is normally worked is P
n, the dutycycle of its work should be less than P
oUT/ P
n.
If average power consumption when wireless sensor node be take fixed duty cycle work is P
q,, when the voltage of thermoelectric generator TEG output is less than 20mV, the energy that super capacitor stores can maintain working time of node and be:
t
S＝C
STORE*(5.25V-3.3V)/P
Q；
Wherein: C
sTOREcapacitance for super capacitor.
(2) mode that wireless sensor node adopts pointwise to collect is uploaded Monitoring Data to wireless temperature measurement manifold: in conduit line, in each wireless sensor node, have unique numbering and positional information.The mode that data upload adopts pointwise to collect: supposing that apart from thermometric manifold node serial number be farthest 1, is secondly 2, apart from thermometric manifold nearest be numbered N; When carrying out temperature data uploading, be first that No. 1 node is passed to node No. 2 by data, then No. 2 nodes are together sent to node No. 3 by No. 1 node and the data of self, and last N node is issued wireless temperature measurement manifold by the data of all nodes.All nodes only send a secondary data a data upload in the cycle, thereby have reduced its average power consumption.
(3) wireless temperature measurement manifold receives after the data of sensor node transmission, just carries out this locality and shows, upload the data to as required Surveillance center, and warning function is provided simultaneously.User can by LCD shield wireless sensor node is set configuration parameter (as emissive power, data acquisition and transmission interval, mode of operation, time and date etc.) during data distributing, first wireless temperature measurement manifold is passed to N node by data, then by N node, passes to N-1 node, finally by No. 2 nodes, passes to node No. 1.
The underground cable Joint Temperature on-line monitoring system that the utility model provides, take collection of energy and wireless sensor technology as core, by thermoelectric generator and energy harvester, converting the temperature difference of cable intermediate joint epidermis and environment to electric energy is that wireless senser is powered, thereby removed the battery in sensor from, make it have non-maintaining, safe and reliable, be convenient to the features such as installation.
Finally should be noted that: above embodiment is only in order to illustrate that the technical solution of the utility model is not intended to limit, although the utility model is had been described in detail with reference to above-described embodiment, those of ordinary skill in the field are to be understood that: still can modify or be equal to replacement embodiment of the present utility model, and do not depart from any modification of the utility model spirit and scope or be equal to replacement, it all should be encompassed in the middle of claim scope of the present utility model.
Claims (9)
1. a underground cable Joint Temperature on-line monitoring system, described system comprises N wireless sensing node, thermoelectric generator and the wireless temperature measurement manifold that is arranged at the aboveground side of cable work, it is characterized in that, cable intermediate joint is arranged at cable work downhole, and single wireless sensing node and thermoelectric generator are installed on the outside surface of cable intermediate joint successively side by side; Described wireless temperature measurement manifold is installed in switching station, ring main unit or the cable branch box of cable termination, take-off connection, and its Antenna extender is collected the Monitoring Data of wireless sensor node to conduit line.
2. temperature online monitoring system as claimed in claim 1, is characterized in that, the side that described thermoelectric generator temperature is high sticks on cable intermediate joint exocuticle, and the side that temperature is low is diffused into hot-fluid in air by heating radiator; Between adjacent cable intermediate head, distance is 100～400 meters.
3. temperature online monitoring system as claimed in claim 1, is characterized in that, described single wireless sensor node comprises and connect successively energy harvester, microcontroller and the first wireless transceiver, and semiconductor temperature sensor is connected with microcontroller; Semiconductor temperature sensor and the first wireless transceiver all obtain power supply by the VOUT pin of microcontroller.
4. temperature online monitoring system as claimed in claim 3, is characterized in that, described energy harvester comprises collection of energy managing chip, miniature transformer, super capacitor and capacitor; Described miniature transformer, super capacitor and capacitor are all connected on collection of energy managing chip.
5. temperature online monitoring system as claimed in claim 3, is characterized in that, described semiconductor temperature sensor adopts the sensor of TMP36 model.
6. temperature online monitoring system as claimed in claim 3, is characterized in that, the inner integrated analog digit converter of described microcontroller, timer, general purpose I/O, interruptable controller On-Chip peripheral;
Microcontroller is connected with the first wireless transceiver by serial peripheral SPI interface, and utilizes general purpose I/O to export to close or off signal SDN controls electrification reset and the working power of the first wireless transceiver.
7. temperature online monitoring system as claimed in claim 3, is characterized in that, utilizes thermoelectric generator and energy harvester to convert the temperature difference of cable intermediate joint and environment to electric energy, is described wireless sensor node power supply.
8. temperature online monitoring system as claimed in claim 1, it is characterized in that, described wireless temperature measurement manifold, by the civil power in switching station, ring main unit or cable branch box, PT power supply or storage battery power supply, comprises microprocessor, the second wireless transceiver, GPRS module/fiber optic Ethernet interface, LCD display, radio circuit and antenna; Described the second wireless transceiver, GPRS module/fiber optic Ethernet interface are connected with microprocessor respectively with LCD display, and described antenna is connected with the second wireless transceiver by radio circuit.
9. temperature online monitoring system as claimed in claim 1, is characterized in that, the frequency range of described wireless sensor node and wireless temperature measurement manifold radio communication is 433MHz, and communication protocol is IEEE802.15.4g, and authenticates by key.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320569776.6U CN203561449U (en) | 2013-09-13 | 2013-09-13 | A buried cable intermediate connector temperature online monitoring system |
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| CN201320569776.6U CN203561449U (en) | 2013-09-13 | 2013-09-13 | A buried cable intermediate connector temperature online monitoring system |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103575415A (en) * | 2013-09-13 | 2014-02-12 | 国家电网公司 | On-line temperature monitoring system and method for intermediate joints of buried cable |
| CN104236752A (en) * | 2014-09-17 | 2014-12-24 | 国家电网公司 | Oil-immersed transformer temperature measuring system |
| CN107687909A (en) * | 2017-09-07 | 2018-02-13 | 国家电网公司 | A kind of cable temperature monitoring system based on Intelligent internet of things |
| CN109313461A (en) * | 2016-05-11 | 2019-02-05 | 豪倍公司 | Power connector with integrated power monitoring |
| CN111579105A (en) * | 2020-03-30 | 2020-08-25 | 中国电力科学研究院有限公司 | Self-powered cable temperature measuring device |
| CN113375818A (en) * | 2021-07-06 | 2021-09-10 | 江南大学 | Wireless temperature measurement system and method for distribution room |
| CN114136468A (en) * | 2021-11-11 | 2022-03-04 | 国网江西省电力有限公司电力科学研究院 | Passive branch box cable joint temperature measurement on-line monitoring system |
| CN114217121A (en) * | 2021-12-08 | 2022-03-22 | 通鼎互联信息股份有限公司 | Electrical experiment method for determining rated average power of radio frequency |
| CN114613093A (en) * | 2022-03-16 | 2022-06-10 | 国网山东省电力公司泰安供电公司 | Gas sensor array device based on crosslinked polyethylene combustion products and detection method |
-
2013
- 2013-09-13 CN CN201320569776.6U patent/CN203561449U/en not_active Expired - Lifetime
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103575415B (en) * | 2013-09-13 | 2016-04-20 | 国家电网公司 | A kind of underground cable Joint Temperature on-line monitoring system and monitoring method thereof |
| CN103575415A (en) * | 2013-09-13 | 2014-02-12 | 国家电网公司 | On-line temperature monitoring system and method for intermediate joints of buried cable |
| CN104236752A (en) * | 2014-09-17 | 2014-12-24 | 国家电网公司 | Oil-immersed transformer temperature measuring system |
| US10873163B2 (en) | 2016-05-11 | 2020-12-22 | Hubbell Incorporated | Power connector with integrated power monitoring |
| CN109313461A (en) * | 2016-05-11 | 2019-02-05 | 豪倍公司 | Power connector with integrated power monitoring |
| US11626698B2 (en) | 2016-05-11 | 2023-04-11 | Hubbell Incorporated | Power connector with integrated power monitoring |
| CN107687909A (en) * | 2017-09-07 | 2018-02-13 | 国家电网公司 | A kind of cable temperature monitoring system based on Intelligent internet of things |
| CN111579105B (en) * | 2020-03-30 | 2022-10-11 | 中国电力科学研究院有限公司 | Self-powered cable temperature measuring device |
| CN111579105A (en) * | 2020-03-30 | 2020-08-25 | 中国电力科学研究院有限公司 | Self-powered cable temperature measuring device |
| CN113375818A (en) * | 2021-07-06 | 2021-09-10 | 江南大学 | Wireless temperature measurement system and method for distribution room |
| CN114136468A (en) * | 2021-11-11 | 2022-03-04 | 国网江西省电力有限公司电力科学研究院 | Passive branch box cable joint temperature measurement on-line monitoring system |
| CN114217121A (en) * | 2021-12-08 | 2022-03-22 | 通鼎互联信息股份有限公司 | Electrical experiment method for determining rated average power of radio frequency |
| CN114613093A (en) * | 2022-03-16 | 2022-06-10 | 国网山东省电力公司泰安供电公司 | Gas sensor array device based on crosslinked polyethylene combustion products and detection method |
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Granted publication date: 20140423 |