CN103676888A - System and method for monitoring ring main unit cable joint temperature - Google Patents
System and method for monitoring ring main unit cable joint temperature Download PDFInfo
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- CN103676888A CN103676888A CN201310695855.6A CN201310695855A CN103676888A CN 103676888 A CN103676888 A CN 103676888A CN 201310695855 A CN201310695855 A CN 201310695855A CN 103676888 A CN103676888 A CN 103676888A
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Abstract
The invention discloses a system and method for monitoring the ring main unit cable joint temperature. The system comprises a ring main unit which comprises a cable chamber, a switch chamber, a secondary wiring chamber, a PT cabinet chamber, a network distributing automation chamber, a ring main unit power distribution terminal, a temperature monitoring terminal and a temperature sensor. In the temperature monitoring process, the environment temperature inside the ring main unit and the temperature of a cable joint inside the ring main unit are respectively measured in real time and are transmitted to a digital signal processor inside the temperature monitoring terminal, the actual temperature rising rate of the cable joint is obtained by carrying out compensation and verification on data, and the actual temperature rising rate is compared with the pre-set actual temperature rising rate threshold value of the cable joint. When the actual temperature rising rate of the cable joint exceeds the threshold value, a digital signal controller produces an alerting signal and enables an alarming module to be started to give an alarm, the data and the state are sent to a long-distance master station, workers of the long-distance master station can respond to fire and other dangerous incidents inside the main ring unit fast, and losses are reduced.
Description
Technical field
The present invention relates to a kind of supervisory system and method, relate in particular to a kind of temperature of cable junction supervisory system and method.
Background technology
Along with improving constantly of the economic sustained and rapid development of Chinese society and living standards of the people, power consumer is had higher requirement to power supply reliability, the quality of power supply and Supply Security.The domestic intelligent distribution network of nowadays wideling popularize develops rapidly, ring main unit can improve power supply reliability, the economy of power distribution network greatly as the main power equipment of intelligent distribution network, and reduce labour intensity, and raise the management level and service quality, promote the development of intelligent distribution network.The advantages such as that power cable has is durable in use, take up an area less, can lay under various occasions are used widely in electric system power transmission and distribution.Yet, its inside cable joint of ring main unit is because a variety of causes is easy to heating, the degree of heat will affect the security of operation of ring main unit self-operating and even whole electrical network, temperature of cable junction is too high can there is severe oxidation, cable is die-offed serviceable life, cause cable splice blast, insulation breakdown, burning etc., cause massive blackout and fire failure.
How better ring main unit inner cable joint to be carried out to effective real time and on line monitoring, to guarantee the safe and reliable operation of the power equipments such as ring main unit, become the problem that everybody competitively studies.In order to realize real time and on line monitoring and the early warning to ring main unit inner cable joint, just need in ring main unit, increase temperature sensor cable splice is carried out to real time temperature monitoring.Domestic nowadays cable splice to be carried out to the method for temperature monitoring a lot, mainly contain in the thermometric wax disk(-sc) method of pasting, the outer infrared imaging method of cabinet, the outer infrared measurement of temperature method of cabinet, contact-sensing thermometry, optical fiber Surface Mount thermometry, cabinet infrared measurement of temperature method etc.Yet, these methods are just carried out real time and on line monitoring for the absolute temperature of cable splice, rely on the cable splice absolute temperature recording indirectly to judge degree of aging, insulation breakdown degree, current capacity size and the imminent potential safety hazard etc. of cable splice.If the cable splice kelvin rating recording surpasses design temperature high alarm setting value and produces alerting signal, this determination methods itself is insecure, can be with and serve false alarm and the problem of not reporting to the police.
For example, in ring main unit, residing environment temperature is 50 ℃, and the temperature of cable junction higher limit arranging is 70 ℃, because exist certain load current to produce temperature that heating is easy to make cable splice in cable, reach 70 ℃ and produce and report to the police, now, current value does not reach the higher limit of setting electric current far away, and insulation breakdown does not occur cable can continue normal reliable operation.
Again for example, the temperature generation cataclysm of ring main unit cable splice, (5～10 seconds) rise to 60 ℃ by 20 ℃ in the short time, and larger variation does not occur environment temperature, and these temperature are all the time within the scope of alarm temperature and can not produce warning.And being cable splices, actual conditions probably there is ground connection or short trouble that insulation breakdown causes.The reason that produces these false alarms or do not report to the police is not consider two important amounts of impact: the one, and the residing environment temperature of cable splice; The 2nd, the climbing speed of cable splice itself and environment temperature.Thereby, on the criterion of the judgement of cable splice reliability, monitoring and early warning, to weigh in all directions the impact of two correlatives, could to cable splice, carry out real time and on line monitoring reliably.
Summary of the invention
The object of the present invention is to provide a kind of temperature monitoring system and method for ring main unit inner cable joint.
A kind of ring main unit temperature of cable junction of the present invention supervisory system, comprises temperature of cable junction monitor terminal, temperature sensor, signal transmssion line, heating resistor, cooling fan etc.
Described monitoring temperature terminal comprises data acquisition module, data processing module, alarm module, communication module, display module and definite value setting module.
Described temperature sensor is connected with data processing module with the data acquisition module of monitoring temperature terminal by transmission line, the communication module of described monitoring temperature terminal is communicated by letter with long-range main station system by fieldbus or by wireless network, and described data processing module is connected by fieldbus with alarm module.
Described temperature sensor comprises the first temperature sensor and the second temperature sensor, described the first temperature sensor measurement cable splice environment absolute temperature around, and described the second temperature sensor is directly measured cable splice absolute temperature.
Described data acquisition module and data processing module can be arranged in digital signal controller, and described definite value setting module is definite value scrambler, and it is connected with the respective pin of digital signal controller.
Described communication module comprises local scene bus communication device and wireless network communication apparatus, and described local scene bus communication device can be RS485/232 communicator, and described wireless network communication apparatus can be wireless network transmitter.
Described monitoring temperature terminal also comprises High-Speed Coupled Device, described High-Speed Coupled Device is arranged between data processing module and described communication module, be arranged between described data processing module and described alarm module and display module, be also arranged between data processing module and ring main unit circuit controling switch.
Described alarm module is alarm, and described display module is display lamp or display screen.
A kind of ring main unit temperature of cable junction of the present invention supervisory system is arranged on ring main unit inside, and described ring main unit comprises cable vault, switch gear room, secondary cabling chamber, PT cabinet chamber, power distribution automation chamber, ring main unit distribution terminal, cable etc.
It is indoor that described ring main unit distribution terminal and monitoring temperature terminal are arranged on power distribution automation, and described the first temperature sensor is arranged in cable vault, and described the second temperature sensor is arranged on the position corresponding with cable splice.
Described data processing module is connected with the switch of ring main unit distribution terminal.
The invention discloses a kind of method of carrying out temperature of cable junction monitoring according to above-mentioned ring main unit temperature of cable junction supervisory system, the steps include:
By infrared temperature-test sensor in ring main unit, the absolute temperature of ring main unit inner cable joint is carried out to temperature real time on-line monitoring, and the value recording is sent to the digital signal controller of monitoring temperature terminal;
By the temperature sensor being installed in ring main unit, the environment absolute temperature in ring main unit is carried out to real time on-line monitoring, and the value recording is sent to the digital signal controller of monitoring temperature terminal;
Monitoring temperature terminal obtains cable splice absolute temperature and two temperature of environment absolute temperature of synchronization, carries out temperature comparison, obtains the relative temperature of cable splice;
Monitoring temperature terminal to a period of time inner cable joint absolute temperature compare, calculate, analyze, draw the absolute temperature rise rate of cable splice, absolute temperature in the same time section of environment temperature is compared, calculates, analyzed, draw the absolute temperature rise rate of environment;
The digital signal controller of monitoring temperature terminal compares calculating by the relative temperature of a period of time inner cable joint, draws the relative temperature rise rate v1 of cable splice;
The digital signal controller of monitoring temperature terminal compares calculating by the absolute temperature rise rate of the environment of synchronization and the absolute temperature rise rate of cable splice, draws the relative temperature rise rate v2 of cable splice;
Described digital signal controller by the relative temperature rise rate v1 of the cable splice calculating compensate with relative temperature rise rate v2, verification, obtain the relative temperature rise rate v0 of actual cable;
According to cable splice relative temperature and relative temperature rise rate v0, relative temperature and temperature rise rate threshold values are set on definite value scrambler, and send digital signal controller to.When cable splice relative temperature or when relatively temperature rise rate v0 surpasses the upper limit threshold values setting, produce alerting signal, by digital signal controller, send to alarm lamp or emergency alarm bell, and produce fan control signal, lower the temperature to cable cabinet.
When cable splice relative temperature or when relatively temperature rise rate v0 surpasses maximum threshold values, digital signal controller sends divide-shut brake order to ring main unit, makes ring main unit power-off, to guarantee device security.
Each data and instruction, all send communication module to by digital signal controller above, then send long-range main website to by communication module, by main website, equipment monitored, and assigns if desired steering order.
Described steering order sends to communication module by main website, and communication module sends instruction to digital signal controller again, by it, distribution terminal relevant device is controlled.
The present invention takes environment temperature monitoring and the relative temperature of cable splice and environment and the intelligent temperature method for supervising that relative temperature climbing speed combines in temperature of cable junction monitoring, ring main unit, propose the concept of ring main unit inner cable joint relative temperature and relative temperature rise rate, invented a kind of novel ring main unit temperature of cable junction monitor terminal.
By the relative temperature value to cable splice, relative temperature rise rate value, carry out rational prejudgementing criteria analysis, can carry out more reliable on-line monitoring and early warning in real time to ring main unit temperature of cable junction state, can control cooling fan or heating resistor according to temperature conditions simultaneously, take even if desired ring main unit to carry out divide-shut brake control, to guarantee the safety of equipment and the reliability of power supply.
Accompanying drawing explanation
Fig. 1 is monitoring temperature terminal mounting structure schematic diagram of the present invention;
Fig. 2 is entire system Organization Chart of the present invention;
Fig. 3 is hardware principle block diagram of the present invention;
Fig. 4 is the flow chart of data processing figure of method for supervising of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail:
Fig. 1 is the monitoring temperature terminal mounting structure schematic diagram of the embodiment of the present invention, and monitoring temperature terminal is arranged in a ring main unit, and ring main unit is a cabinet, and cabinet comprises cable vault 1, switch gear room 2, secondary cabling chamber 3, PT power cabinet 4, power distribution automation chamber 5.In power distribution automation chamber 5, be provided with distribution terminal 6 and monitoring temperature terminal 7.Cable vault is positioned at ring main unit bottom, has a plurality ofly, and there are cable splice 8 and sensor in its inside.
Ring main unit body: ring main unit is taked the common box type structure of isolating switch, lower load cell, the sealing stainless steel casing of outfit all insulation, built-in SF gas, the rugged surroundings that can bear humidity, rocky many dirt.
Switch gear room 2: have a plurality ofly, be positioned at cable vault top, be provided with the switchgear of ring main unit.
Secondary cabling chamber 3: be positioned at ring main unit top, top, switch gear room, the cabling of ring main unit secondary rack and sensor and monitoring temperature terminal is all by 3 wirings of secondary cabling chamber.
PT power cabinet 4: the part of ring main unit secondary power supply disposes separately a PT cabinet; PT cabinet can be taked the mode of duplex feeding; can obtain power supply from two-way inlet wire; and there is back-up source, to guarantee that ring main unit can continually provide reliable power supply to monitoring temperature terminal and ring main unit distribution terminal.
Power distribution automation chamber 5: the indoor distribution terminal 6 that is provided with monitoring temperature terminal 7 and ring main unit of power distribution automation, also comprises communication module, for communicating with substation or main website.
Distribution terminal 6: be used to the power supply of monitoring temperature terminal.
Monitoring temperature terminal 7: data acquisition module, data processing module, alarm module, communication module, display module and definite value setting module, not shown in the drawings.
The first temperature sensor 9: for being installed on the infrared temperature-test sensor in cable vault, high-pressure side, keep suitable distance with cable splice, measure the kelvin rating of cable splice 8.More than in 10kV and 35kV ring main unit, probe should remain on 40mm from the distance of cable splice, therefore the distance coefficient of infrared temperature probe should be 10:1 than minimum, can adopt the infrared temperature-test sensor of TN9 series, temperature-measuring range is-30 ℃～+ 275 ℃, and precision is 0.1 ℃.
The second temperature temperature sensor 10: be installed in cable vault, high-pressure side, far away apart from cable splice, for measuring the absolute environment temperature in cable vault, and send the value recording to monitoring temperature terminal.Can adopt serial SHT10 temperature sensor, measuring temperature range is-45 ℃～275 ℃, and precision is 0.1 ℃.
The first temperature temperature sensor 9 is connected with data processing module with the data acquisition module of monitoring temperature terminal 7 by transmission line with the second temperature sensor 10, the communication module of monitoring temperature terminal 7 is by fieldbus or by wireless network and long-range master station communication, described data processing module is connected by fieldbus with alarm module.
Fig. 2 is the entire system Organization Chart of the embodiment of the present invention, and a plurality of ring main units are by communication network and master station communication.In each ring main unit, temperature of cable junction monitoring sensor and environment temperature monitoring sensor send measured data to monitoring temperature terminal, monitoring temperature terminal sends data to main website by communication network, when data surpass limit value, reports to the police and temperature control modules action.
Fig. 3 is the hardware principle block diagram of the embodiment of the present invention.
The first temperature sensor and the second temperature sensor in ring main unit cable vault 1 are measured respectively cable vault's environment temperature and temperature of cable junction, and the two is connected with the digital signal controller of monitoring temperature terminal; Definite value scrambler in monitoring temperature terminal 7 is connected with digital signal controller; Communication module, alarm module, display module are connected with respectively photo-coupler, and the other end of photo-coupler is connected to digital signal controller; Digital signal controller is also connected with the switch of ring main unit distribution terminal, and is in series with photo-coupler between the two.
The first temperature sensor and the second temperature sensor are respectively cable splice temperature probe, environment temperature sensor, the two value recording sends digital signal controller to as analog signals, definite value scrambler input value is recorded by the digital signal controller of distribution terminal, and as input quantity, supply digital signal controller as criterion.Communication module is connected with digital signal controller by field bus protocol, meanwhile, by fieldbus or wireless network and backstage main station system, carries out real-time communication.The control signal of digital signal controller output acts on killer switch, fan or the heating resistor of ring main unit, is respectively used to make ring main unit to carry out breaking-closing operating, cooling processing or hyperthermic treatment.The controlling alarm of digital signal controller, state display control signal act on respectively alarm and data display unit.Wherein, between digital signal controller and alarm module, looped network cabinet switch and communication module, by photo-coupler, be connected respectively, to guarantee that data are accurate.The alarm that alarm module adopts can comprise buzzing warning, sound and light alarm, and data disaply moudle comprises LED state pilot lamp, LCD LCDs etc.
Fig. 4 is the flow chart of data processing figure of method for supervising of the present invention.
Temperature sensor in ring main unit cable vault records after the absolute temperature and environment absolute temperature of cable splice, carries out denoising, is presented on the display screen of monitoring temperature terminal; Digital signal controller calculates cable splice relative temperature value, the absolute temperature rise rate of cable splice and the absolute temperature rise rate of environment by data after processing by certain algorithm, and is presented on display screen; Digital signal controller contrasts three new datas, calculate, and draws the relative temperature rise rate of cable splice and is presented on display screen; Above-mentioned signal, by compensation, verification, has drawn the closest value of the relative temperature rise rate of cable splice, is sent to equally display screen; Gained is approached to the relative temperature rise rate value of cable splice most to digital signal controller and cable splice relative temperature value compares with setting threshold values, and send alarm signal according to comparative result, is presented at equally on the display screen of monitoring temperature terminal.
In practical application, the digital signal controller of distribution terminal adopts the DSC chip that model is STM32f407VG; The internal resource of chip is a lot, and memory capacity is large, low price, and ARM chip has wireless communication interface, ethernet interface simultaneously, also can produce PWM ripple, can fast processing and output analog quantity, digital quantity, control signal, alerting signal etc.Control signal, alerting signal output are increased to TLP112 light-coupled isolation, guarantee stability and the anti-interference of output signal.Take the communication module of grand electric H7710 series, monitor terminal can, by swap data between GPRS communication mode and main website, can send to user mobile phone alerting signal by gsm communication mode again.There is the local communication of RS232/RS485 and maintenance interface simultaneously.
Above embodiment is described the preferred embodiment of the present invention; not scope of the present invention is limited; design under the prerequisite of spirit not departing from the present invention; various distortion and improvement that the common engineering technical personnel in this area make technical scheme of the present invention, all should fall into the definite protection domain of claims of the present invention.
Claims (7)
1. a ring main unit temperature of cable junction supervisory system, comprise ring main unit, described ring main unit comprises cable vault (1), switch gear room (2), secondary cabling chamber (3), PT power cabinet (4), power distribution automation chamber (5), in described power distribution automation chamber (5), be provided with distribution terminal (6) and monitoring temperature terminal (7), described cable vault (1) is positioned at ring main unit bottom, have a plurality ofly, there are cable splice (8) and sensor in its inside;
Described ring main unit is taked the common box type structure of isolating switch, lower load cell, is equipped with the sealing stainless steel casing of all insulation, built-in SF gas;
Described switch gear room (2) is positioned at top, cable vault, is provided with the switchgear of ring main unit;
Described secondary cabling chamber (3) is positioned at ring main unit top, top, switch gear room, and the cabling of ring main unit secondary rack and sensor and monitoring temperature terminal is all by 3 wirings of secondary cabling chamber;
It is characterized in that, also comprise long-range main website;
Described monitoring temperature terminal (7) comprises digital signal controller and alarm module;
Described temperature sensor is arranged in cable vault, and is connected with monitoring temperature terminal (7) by signal transmssion line;
Described monitoring temperature terminal (7) intercoms mutually with long-range main website;
Described monitoring temperature terminal (7) is connected with described alarm module.
2. ring main unit temperature of cable junction supervisory system according to claim 1, is characterized in that,
Described temperature sensor comprises the first temperature sensor (9) and the second temperature sensor (10), described the first temperature sensor (9) is measured cable splice absolute temperature, and described the second temperature sensor (10) is measured ring main unit cable indoor environment absolute temperature;
Described monitoring temperature terminal (7) and described ring main unit distribution terminal (6) are arranged in distribution automation chamber (5);
Described monitoring temperature terminal (7) is by fieldbus or by wireless network and long-range master station communication;
Described monitoring temperature terminal (7) is connected by fieldbus with alarm module;
Described monitoring temperature terminal (7) also comprises wireless network transmission module and display module.
3. ring main unit temperature of cable junction supervisory system according to claim 2, is characterized in that,
Also comprise definite value scrambler, photo-coupler;
Between the digital signal controller of described distribution terminal (6) and described alarm module, described display module, described communication module, be provided with photo-coupler.
4. ring main unit temperature of cable junction supervisory system according to claim 3, is characterized in that,
Described alarm module is alarm, and described display module is display screen;
It is the DSC chip of STM32f407VG that described digital signal controller can adopt model;
Described communication module can adopt H7710 series.
5. utilize the arbitrary described ring main unit temperature of cable junction supervisory system of claim 1-4 to carry out a method for ring main unit cable splice (8) temperature, it is characterized in that comprising the following steps:
By temperature sensor in ring main unit, measure respectively environment absolute temperature and the cable splice absolute temperature in ring main unit;
Calculate the relative temperature of cable splice to ring main unit environment;
Calculate the relative temperature rise rate of a period of time inner cable joint;
The relative temperature of cable splice is arranged to upper limit threshold values with relative temperature rise rate, when the relative temperature of cable splice surpasses upper limit threshold values with relative temperature rise rate, produce and report to the police;
Digital signal controller sends separating brake order to ring main unit distribution terminal (6), makes ring main unit power-off, to guarantee device security;
Simultaneous temperature monitor terminal (7) sends alerting signal to communication module, by communication module, by local scene bus or wireless network, sends long-range main website to;
Long-range main website sends instruction to ring main unit monitoring temperature terminal (7), makes it to start heat sink, the operation such as lower the temperature.
6. ring main unit temperature of cable junction method for supervising according to claim 5, is characterized in that comprising the following steps:
By described the first temperature sensor (9) in ring main unit, the absolute temperature of ring main unit inner cable joint (8) is carried out to temperature real time on-line monitoring, and the value recording is sent to the digital signal controller of monitoring temperature terminal (7);
By the second temperature sensor (10) being installed in ring main unit, the absolute environment temperature in ring main unit is carried out to real time on-line monitoring, and the value recording is sent to the digital signal controller of monitoring temperature terminal (7);
Monitoring temperature terminal (7) compares, calculates, analyzes the absolute temperature of a period of time inner cable joint (8), draw the absolute temperature rise rate of cable splice, absolute temperature in the same time section of environment temperature is compared, calculates, analyzed, draw the absolute temperature rise rate of environment;
The digital signal controller of monitoring temperature terminal (7) compares calculating by the absolute temperature rise rate of the environment in a period of time and the absolute temperature rise rate of cable splice, draws the relative temperature rise rate v2 of cable splice;
Described monitoring temperature terminal (7) obtains cable splice absolute temperature and two temperature of environment absolute temperature of synchronization, carries out temperature comparison, obtains the relative temperature of cable splice;
The digital signal controller of monitoring temperature terminal (7) compares calculating by the relative temperature of a period of time inner cable joint, draws the relative temperature rise rate v1 of cable splice;
Described digital signal controller by the relative temperature rise rate v1 of the cable splice calculating compensate with relative temperature rise rate v2, verification, obtain the relative temperature rise rate v0 of actual cable;
According to the relative temperature rise rate v0 of cable, cable splice relative temperature threshold values temperature rise rate threshold values relative to cable splice is set on definite value scrambler, and sends digital signal controller to; When cable splice relative temperature threshold values temperature rise rate relative to cable splice surpasses respective thresholds, digital signal controller sends alerting signal, and sends to alarm lamp or emergency alarm bell, and produces fan control signal, lowers the temperature to cable vault (1);
Meanwhile, digital signal controller sends separating brake order to ring main unit distribution terminal (6), makes ring main unit power-off, to guarantee device security.
7. ring main unit temperature of cable junction method for supervising according to claim 6, is characterized in that:
Described monitoring temperature terminal (7) can send to user mobile phone alerting signal by gsm communication mode again by swap data between GPRS communication mode and main website, has the local communication of RS232/RS485 and maintenance interface simultaneously.
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| CN107394750A (en) * | 2017-06-21 | 2017-11-24 | 合肥远见电力科技有限公司 | A kind of intelligent Bus monitoring system based on temperature anomaly detection |
| CN109285331A (en) * | 2018-11-29 | 2019-01-29 | 国网上海市电力公司 | A kind of Temperature of Power Cables early warning system based on data analysis and temperature prediction |
| CN109946546A (en) * | 2019-04-10 | 2019-06-28 | 苏州科技大学 | A kind of the degradation system and method for excessive heating protection of photoelectrical coupler |
| CN110108366A (en) * | 2019-05-20 | 2019-08-09 | 国网福建省电力有限公司漳州供电公司 | A kind of infrared cable vault's temp measuring system of dot matrix based on dispatch network |
| CN111443263A (en) * | 2020-04-24 | 2020-07-24 | 上海道博电气有限公司 | Cable analysis device based on ring main unit and detection method thereof |
| CN111443263B (en) * | 2020-04-24 | 2022-02-22 | 上海道博电气有限公司 | Cable analysis device based on ring main unit and detection method thereof |
| CN111650475A (en) * | 2020-06-24 | 2020-09-11 | 国家电网有限公司 | Power distribution network cable monitoring method |
| CN112647927A (en) * | 2020-12-29 | 2021-04-13 | 天水电气传动研究所集团有限公司 | Automatic early warning method for power point temperature rise step type grading of drilling machine electric control system |
| WO2024077675A1 (en) * | 2022-10-14 | 2024-04-18 | 云南电网有限责任公司普洱供电局 | Distributed online temperature monitoring system applied to power supply loop |
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