CN103226046A - Current-carrying thermal effect simulation monitoring method for fiber medium-voltage composite cable - Google Patents
Current-carrying thermal effect simulation monitoring method for fiber medium-voltage composite cable Download PDFInfo
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- CN103226046A CN103226046A CN2012100212453A CN201210021245A CN103226046A CN 103226046 A CN103226046 A CN 103226046A CN 2012100212453 A CN2012100212453 A CN 2012100212453A CN 201210021245 A CN201210021245 A CN 201210021245A CN 103226046 A CN103226046 A CN 103226046A
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Abstract
The invention relates to a current-carrying thermal effect simulation monitoring method for a fiber medium-voltage composite cable. Temperature detecting optical cables are nested in and laid outside the medium-voltage power cable; a thermocouple is arranged on the medium-voltage power cable and then the medium-voltage power cable is placed in a simulation bin; the length of the cable in the simulation bin is controlled within 5-7 m; the change of load current in the cable is controlled; and monitoring of the current-carrying thermal effect of the cable is fulfilled through the thermocouple on the medium-voltage power cable. Compared with the prior art, the method provided by the invention has the advantages of small error, fast response, suitability for different external environments and the like; the control over the maximum operating temperature of the medium-voltage power cable in different environments provides an important guarantee for safety operation of a cable line.
Description
Technical field
The present invention relates to a kind of method of analog monitoring cable performance, especially relate to the current-carrying thermal effect analog monitoring method of pressing composite cable in a kind of optical fiber.
Background technology
Along with improving constantly of national economy and fast development of society and living standards of the people, the whole society is more and more higher to the requirement of safety, economy, high-quality electricity consumption, and the pressure of electric power netting safe running management is increasing.And, particularly bear the on-line monitoring of running status of the cable system of electric energy transmitting to the on-line condition monitoring of operation power equipment, facility, guarantee one of technical foundation of electric power netting safe running especially.Simultaneously, the primary effect of intelligent grid under preparation at present should be effectively to guarantee the electric power safety reliability, make more traditional electrical network stronger and have bigger " elasticity ", the influence that can withstand natural calamities effectively, all kinds of accidents such as outside destroy causes to electric system; And have powerful " self-healing " function, and can pass through remote equipment in-service monitoring and system information analysis, predict and dispose the sorts of systems fault more in time, exactly.In intelligent grid was built, the construction emphasis of power transformation link was the intelligent substation with intelligent early-warning monitoring function.
This just need a kind of can be at high voltage, highfield environment, can the relevant grid equipment of online detection, the facility operation state, technological means that again can high-speed high capacity transmission detection information.
Optical fiber has directly thin, soft, the lightweight mechanical property of matter.Electric property with insulation, electromagnetic-radiation-free.Also has water-fast, high temperature resistant, corrosion resistant chemical property.The light signal that optical fiber transmits has the performance of anti-electromagnetic interference (EMI) and atomic radiation.Can be with the optical fiber fabrication sensor in the inaccessible place of people (as the high-temperature region), the area that perhaps is pernicious to people (closing) as nuclear radiation district and strong-electromagnetic field, play the effect of people's knowledge, and can also surmount people's physiological limits, recipient's sense organ impression less than external information.Simultaneously, optical fiber also can realize at a distance, the information communication of high-speed high capacity.
Therefore, by in the conventional electric power cable, embedding has that temperature is surveyed and the electrical network of the power optical fiber composite cable of the optical fiber of communication function, in transformer station, lay sensor fibre with temperature detection function, just can realize remote online monitoring and fire alarm, realize the function of information optical fiber communication between 10kv station and 35kv station thermal environment in the transformer station and turnover cable dynamic current-carrying capacity.The technical conditions of key are provided for the construction of intelligent grid.Simultaneously, because Fibre Optical Sensor has the function of non-electrical resistivity survey calorimetric environment, be particularly suitable for monitoring of running temperature telesecurity and detection to equipment in cable and the unattended operation transformer station.
On existing basis, if can realize higher conductor temperature estimation precision, and better system response time; In addition, the power cable that can lay long distance lay the climatic environment temperature variation, and cable laying thermal resistance condition changes, realize dynamically calculating accurately by rice piecemeal and revising, do not do simulation test and set up the correction database table and need not spend a large amount of inputs, this is the technical matters that needs to be resolved hurrily.
Summary of the invention
Purpose of the present invention is exactly to provide in order to overcome the defective that above-mentioned prior art exists that a kind of error is little, response is fast and be applicable to the current-carrying thermal effect analog monitoring method of pressing composite cable in the optical fiber of different external environments.
Purpose of the present invention can be achieved through the following technical solutions:
Press the current-carrying thermal effect analog monitoring method of composite cable in the optical fiber, it is characterized in that this method may further comprise the steps:
(1) the extraordinary temperature detecting optical cable with high thermal conductivity is embedded in the medium-pressure power cable, and lays the extraordinary temperature detecting optical cable of a high thermal conductivity in the outside of medium-pressure power cable;
(2) thermopair is set and is placed in the simulation storehouse on medium-pressure power cable, the length of umbilical cable in the simulation storehouse is 5-7m;
(3) electric current in the umbilical cable, load current are increased to 80% from fully loaded 50% respectively, are elevated to 100% again, are elevated to 110% again, are reduced to 80%, reduce to 50% at last, and each process keeps 3 to 4h;
(4) utilize thermocouple monitoring on the medium-pressure power cable to the current-carrying thermal effect of cable, the extraordinary temperature detecting optical cable of the high thermal conductivity that the outside is laid compensates correction automatically to the safe current-carrying results of measuring of medium-pressure power cable, promptly finishes the monitoring of current-carrying thermal effect.
The extraordinary temperature detecting optical cable of described high thermal conductivity is and nonmetal structure detecting optical cable or nonmagnetic metal sheathed structure detecting optical cable, with the susceptibility of the temperature detecting optical cable exploration cable conductor temperature of checking different structure.
Be embedded in the centre and cable packed layer of three-phase conductor that detecting optical cable in the medium-pressure power cable is located at medium-pressure power cable, with the best embedded location of optical cable of checking exploration cable conductor temperature.
The temperature detecting optical cable of medium-pressure power cable outside of being laid in is located at the outside of medium-pressure power cable sheath, is used to survey difference and lays the axially distribution in environment temperature field of environment cable footpath, and cable security current-carrying results of measuring is compensated correction automatically.
Described simulation storehouse comprises tunnel environment simulation storehouse, direct-burried environmental simulation storehouse, Water Environment Simulation storehouse and poling environmental simulation storehouse.
For the conductor temperature accuracy is calculated in the optical fiber sensing system test that comparison embeds in the medium-pressure power cable, be in four kinds of differences and lay the pin type thermopair of all having implanted direct contact exploration cable conductor temperature in environment section and the airborne cable, and use SH540-SDN type moisture recorder to carry out record.
Also be provided with the punching transformer of the big electric current that is used for being coupled on the described medium-pressure power cable, the big current-carrying of simulation up to 4000 amperes.
Compared with prior art, the present invention has the following advantages:
(1) adopted the measuring and calculating of " Embedded Double compensating optical fiber " cable current-carrying integrated, through compensation of cable ambient temperature line style and current data correction, the cable conductor actual temperature of the very approximate thermopair actual measurement of the cable conductor accounting temperature of cable current-carrying calculating system, error is in ± 1.5 ℃ of scopes;
(2) be embedded in cable conductor temperature that the high heat-conducting type temperature detecting optical cable of midium voltage cable three-phase conductor center detected near actual value; And fast to the dynamic response that current loading changes, in 1 hour, can experience conductor temperature fully substantially;
(3) the cable conductor temperature that is detected at the temperature detecting optical cable of the different structure of same position is basic identical.This provides technical basis for next step adopts nonmetal high heat conduction temperature detecting optical cable;
(4) it is invalid to be in the environment temperature detecting optical cable compensation of the cable external application of laying in the water, because the cable surrounding enviroment temperature in the water is basic identical;
(5) the sunkissed of environment temperature detecting optical cable that is in the cable external application of laying in the air ambient has the greatest impact, and the temperature compensation correction effect is the most obvious;
(6) simplation verification, under identical current-carrying condition, cable conductor temperature rise maximum (thermal resistance maximum) when comb lays, cabling conductor temperature rise minimum (thermal resistance minimum) in the water; In the current cycle test of five kinds of differences being laid environment, be very large by actual its difference of test cable conductor temperature.Under 110% same load current, conductor temperature is respectively 97.2 ℃, 82.0 ℃, 80.4 ℃, 71.3 ℃, 53.8 ℃ in comb, air, tunnel, direct-burried and the water, even diverse location is also variant under same environment.This kind situation will be more complicated and serious under the environment of practical application, because the performance of cable line homogeneous relatively own, therefore, in the face of different environment its high running temperature of temperature of control down, will provide important leverage to the safe operation of cable line.
Description of drawings
Fig. 1 is to composite cable loading current change figure.
Embodiment
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
Embodiment
Press the current-carrying thermal effect analog monitoring method of composite cable in the optical fiber, may further comprise the steps:
(1) the extraordinary temperature detecting optical cable of high thermal conductivity is embedded in the centre and cable packed layer of three-phase conductor of medium-pressure power cable, and lay the extraordinary temperature detecting optical cable of a high thermal conductivity in the outside of the sheath of medium-pressure power cable, be respectively applied for the best embedded location of optical cable of checking exploration cable conductor temperature and survey the different axially distributions in environment temperature field of environment cable footpath of laying, and cable security current-carrying results of measuring compensated correction automatically, the extraordinary temperature detecting optical cable of use therein high thermal conductivity is and nonmetal structure detecting optical cable or nonmagnetic metal sheathed structure detecting optical cable, with the susceptibility of the temperature detecting optical cable exploration cable conductor temperature of checking different structure;
(2) thermopair being set on medium-pressure power cable is placed in environmental simulation storehouse, direct-burried environmental simulation storehouse, Water Environment Simulation storehouse and the poling environmental simulation storehouse, the length of umbilical cable in the simulation storehouse is 5-7m, for the conductor temperature accuracy is calculated in the optical fiber sensing system test that comparison embeds in the medium-pressure power cable, be in four kinds of differences and lay the environment section and be in the pin type thermopair of all having implanted direct contact exploration cable conductor temperature in the airborne cable, and use SH540-SDN type moisture recorder to carry out record;
(3) electric current in the umbilical cable, loading current change figure as shown in Figure 1, load current is increased to 80% from fully loaded 50% respectively, is elevated to 100% again, is elevated to 110% again, is reduced to 80%, reduces to 50% at last, each process keeps 3 to 4h;
(4) utilize thermocouple monitoring on the medium-pressure power cable to the current-carrying thermal effect of cable, the extraordinary temperature detecting optical cable of the high thermal conductivity that the outside is laid compensates correction automatically to the safe current-carrying results of measuring of medium-pressure power cable, promptly finish the monitoring of current-carrying thermal effect, in addition, on medium-pressure power cable, also be provided with the punching transformer of the big electric current that is used for being coupled, the big current-carrying of simulation up to 4000 amperes.
The 10kv switchyard that this method selects the perseverance of Fengxian south bridge to contain Jia Yuan is implemented correlation technique as the demonstration project of this project, has designed the construction scheme of demonstration project.
(1) with in the cable of two common 3*400-8.7/15kv that enter the station in the former design one changed in OE-(the M2+S24)-1-3*400-8.7/15kv novel optical fiber with optical fiber sensing function and 24 core fibre communication functions and to have pressed the composite intelligent cable;
(2) utilize the fiber optic temperature detecting function, transformer room, switch cubicle, cable duct in the station have laid the temperature detecting optical cable that is used for temperature monitoring and fire alarm;
(3) utilize a fiber optic temperature detector, monitor electric power facility temperature variation in above-mentioned cable temperature and the station;
(4) by pressing temperature measuring optical cable and the glad telemetering of current data that can company on the composite rope in inserting simultaneously, calculate the safe carrying capacity thermal effect redundance of pressing the composite intelligent cable in the novel optical fiber;
(5) utilize in OE-(M2+S24)-1-3*400-8.7/15kv novel optical fiber the 24 core telecommunication optical fibers of pressing in the composite intelligent cable to connect 35kv transformer station and 10kv switchyard respectively, as the alternate channel of information communication between the distribution transforming power station.
In the research of this project, primary study press composite cable technology and midium voltage cable insulation course temperature and the conductor current-carrying capacity relation mathematic model and the fiber broadband communication technology in the optical fiber sensing technology of integrated application fiber raman scattering temperature modulation effect, the optical fiber, realized:
(1) application one cover linear optical fiber temperature-sensitive Raman detection system, the interior electric power facility environment temperature of cable current-carrying redundance and station that while on-line monitoring switchyard lays outward.And have fire pre-(newspaper) concurrently and warn function; System's investing price ratio and benefit have been improved.
(2) use in the optical fiber with temperature sensing and optical fiber communication function and press composite power cable, realized broadband function of telecommunication optical fiber and compoundization of photoelectricity technology between 35kv station and 10kv switchyard.
Claims (7)
1. press the current-carrying thermal effect analog monitoring method of composite cable in the optical fiber, it is characterized in that this method may further comprise the steps:
(1) the extraordinary temperature detecting optical cable with high thermal conductivity is embedded in the medium-pressure power cable, and lays the extraordinary temperature detecting optical cable of high thermal conductivity in the outside of medium-pressure power cable;
(2) thermopair is set and is placed in the simulation storehouse on medium-pressure power cable, the length of umbilical cable in the simulation storehouse is 5-7m;
(3) electric current in the umbilical cable, load current are increased to 80% from fully loaded 50% respectively, are elevated to 100% again, are elevated to 110% again, are reduced to 80%, reduce to 50% at last, and each process keeps 3 to 4h;
(4) utilize thermocouple monitoring on the medium-pressure power cable to the current-carrying thermal effect of cable, the extraordinary temperature detecting optical cable of the high thermal conductivity that the outside is laid compensates correction automatically to the safe current-carrying results of measuring of medium-pressure power cable, promptly finishes current-carrying thermal effect analog monitoring.
2. press the current-carrying thermal effect analog monitoring method of composite cable in the optical fiber according to claim 1, it is characterized in that the extraordinary temperature detecting optical cable of described high thermal conductivity is and nonmetal structure detecting optical cable or nonmagnetic metal sheathed structure detecting optical cable.
3. press the current-carrying thermal effect analog monitoring method of composite cable in the optical fiber according to claim 1, it is characterized in that, be embedded in the centre and cable packed layer of three-phase conductor that detecting optical cable in the medium-pressure power cable is located at medium-pressure power cable.
4. press the current-carrying thermal effect analog monitoring method of composite cable in the optical fiber according to claim 1, it is characterized in that the temperature detecting optical cable of the medium-pressure power cable outside that is laid in is located at the outside of medium-pressure power cable sheath.
5. press the current-carrying thermal effect analog monitoring method of composite cable in the optical fiber according to claim 1, it is characterized in that described thermopair is the pin type thermopair, use SH540-SDN type moisture recorder to carry out thermograph.
6. press the current-carrying thermal effect analog monitoring method of composite cable in the optical fiber according to claim 1, it is characterized in that, described simulation storehouse comprises tunnel environment simulation storehouse, direct-burried environmental simulation storehouse, Water Environment Simulation storehouse and poling environmental simulation storehouse.
7. press the current-carrying thermal effect analog monitoring method of composite cable in the optical fiber according to claim 1, it is characterized in that, also be provided with the punching transformer of the big electric current that is used for being coupled on the described medium-pressure power cable.
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Citations (6)
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| DE4027538A1 (en) * | 1990-04-02 | 1991-10-10 | Felten & Guilleaume Energie | Electrical power cable with integrated fibre=optic element - providing data transmission and monitoring of cable temp. for use with middle to high voltage |
| JP2002131142A (en) * | 2000-10-19 | 2002-05-09 | Hitachi Cable Ltd | Method of estimating temperature of cable conductor |
| CN201160014Y (en) * | 2007-12-13 | 2008-12-03 | 上海波汇通信科技有限公司 | High voltage power cable of composite optical fiber |
| JP2009025122A (en) * | 2007-07-19 | 2009-02-05 | Tokyo Electric Power Co Inc:The | Cable conductor temperature estimation method in consideration of latent heat effect in tunnel, cable conductor temperature estimation system, and cable conductor temperature estimation program |
| CN201946374U (en) * | 2010-11-16 | 2011-08-24 | 杭州华新电力线缆有限公司 | Multiphase optical fiber composite power cable |
| CN102323496A (en) * | 2011-05-31 | 2012-01-18 | 广东电网公司广州供电局 | System for monitoring current-carrying capacity of cable conductor and method |
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2012
- 2012-01-30 CN CN201210021245.3A patent/CN103226046B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4027538A1 (en) * | 1990-04-02 | 1991-10-10 | Felten & Guilleaume Energie | Electrical power cable with integrated fibre=optic element - providing data transmission and monitoring of cable temp. for use with middle to high voltage |
| JP2002131142A (en) * | 2000-10-19 | 2002-05-09 | Hitachi Cable Ltd | Method of estimating temperature of cable conductor |
| JP2009025122A (en) * | 2007-07-19 | 2009-02-05 | Tokyo Electric Power Co Inc:The | Cable conductor temperature estimation method in consideration of latent heat effect in tunnel, cable conductor temperature estimation system, and cable conductor temperature estimation program |
| CN201160014Y (en) * | 2007-12-13 | 2008-12-03 | 上海波汇通信科技有限公司 | High voltage power cable of composite optical fiber |
| CN201946374U (en) * | 2010-11-16 | 2011-08-24 | 杭州华新电力线缆有限公司 | Multiphase optical fiber composite power cable |
| CN102323496A (en) * | 2011-05-31 | 2012-01-18 | 广东电网公司广州供电局 | System for monitoring current-carrying capacity of cable conductor and method |
Non-Patent Citations (1)
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| 孟凡凤等: "地下直埋电缆温度场和载流量的数值计算", 《绝缘材料》 * |
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