For the thermometric pilot system of cable intermediate joint temperature field measurement
The utility model relates to a kind of thermometric pilot system for cable intermediate joint temperature field measurement, belongs to cable intermediate joint temperature monitoring technique field.
Cable aging, current-carrying capacity is all closely related with temperature, by these data of monitor temperature amount, can judge the running status of cable.For cable temperature measurement aspect, the difficulty directly measuring the cable core temperature that puts into operation is comparatively large, therefore mostly being the distribution by calculating cable surface temperature field in engineering, determining cable core temperature and current-carrying capacity.Chinese scholars has carried out a large amount of research work, proposes based on the keypoint part point type temp measuring method of thermistor, thermopair equitemperature sensor, based on the line formula temp measuring method of temperature sensing cable and pre-buried distribution type fiber-optic, the contactless temperature-measuring method based on infrared thermal imaging.
The shortcoming of above-mentioned temp measuring method is that thermometric is greatly affected by environment, can not Timeliness coverage insulation defect position, as the method for testing of thermistor, thermopair etc., transmission range is short, poor anti jamming capability, if in sensor long period of soaking water, can affect serviceable life and temperature measurement accuracy; By inner for optical fiber buried cable temp measuring method, long distance lay involve great expense, installation work is huge, uses temperature sensing cable can only show maximum temperature in certain thermometric section, poor real; The method of infrared thermal imaging, to the underground cable monitoring difficulty of laying circumstance complication, is unsuitable for promoting.
Add up and find that intermediate head is the fault position occurred frequently of cable line, the temperature of intermediate head is the important parameter of its running status of reflection, therefore effectively measures Joint Temperature and is significant for the security and economy improving cable operation.
General current-carrying capacity test and thermometric test are just for cable body, on-line monitoring research is carried out less for Joint Temperature, also not for the Temperature calculating of intermediate head, and due to cable intermediate joint (such as prefabricated intermediate head), all there is larger difference with cable body in its material and temperature field structure, insulate thick, poor heat radiation, both Temperature Distribution are different under the same conditions, in such as cable intermediate joint During Process of Long-term Operation, conduct heat with natural convection air in its surface, when reaching thermal equilibrium when generating heat with heat radiation, Temperature Distribution does not change in time, namely inner conductor temperature and surface temperature remain constant respectively.Therefore, be necessary on the basis analyzing intermediate head structure, the measurement of further investigation Joint Temperature field.
Utility model content
The utility model technical issues that need to address are for the deficiencies in the prior art, propose a kind of thermometric pilot system for cable intermediate joint temperature field measurement, have the advantage that measuring accuracy is high, the error of calculation is little, easy to operate.
For solving the problems of the technologies described above, the technical scheme that the utility model adopts is: a kind of thermometric pilot system for cable intermediate joint temperature field measurement, comprise be arranged on cable and primarily of prefabricated component and be arranged on prefabricated component outside containment vessel form intermediate head on some temperature sensors, the temperature-measuring control device be connected with temperature sensor, described temperature-measuring control device comprises power supply, the pressure regulator be connected successively with power supply and rising current transformer, reometer is connected with between pressure regulator and rising current transformer, rising current transformer stube cable two ends, also comprise the data acquisition module be connected with temperature sensor, data acquisition module is connection data receiver module and computing machine successively, computing machine also connects current-carrying capacity collector, intermediate head on current-carrying capacity collector stube cable,
Body conductor sensor on the conductor that described temperature sensor comprises joint conductor sensor on the conductor of the cable be arranged in prefabricated component, be arranged on outside prefabricated component, be arranged on cable supracutaneous body epidermis sensor, be arranged on prefabricated component supracutaneous joint epidermis sensor, be arranged on containment vessel supracutaneous containment vessel epidermis sensor, above-mentioned all temperature sensors are all connected with data acquisition module;
Described joint conductor sensor is the built-in wireless passive temperature sensor of circular ring type structure, the major diameter fit of the conductor of its internal diameter and cable, and circular ring type joint conductor sensor sleeve is connected on the conductor in prefabricated component.
The further improvement of technical solutions of the utility model is: described temperature sensor also comprises the environment temperature sensor of measures ambient temperature, environment temperature sensor connection data acquisition module.
The further improvement of technical solutions of the utility model is: environment temperature sensor is arranged on outside the containment vessel of intermediate head, environment temperature sensor distance protection shell 0.2m ~ 2m.
The further improvement of technical solutions of the utility model is: containment vessel epidermis sensor is two, is arranged symmetrically in the containment vessel two ends of intermediate head.
The further improvement of technical solutions of the utility model is: the containment vessel of intermediate head arranges heat tape.
The further improvement of technical solutions of the utility model is: reometer is clamp on amperemeter.
Owing to have employed technique scheme, the technical progress that the utility model obtains is: by realizing multimetering at different cable floor mounting temperature sensor, change current-carrying capacity of cable simultaneously and carry out repeatedly revision test, current-carrying capacity of cable and the relation of different cable floor temperature under acquisition different condition, have the advantage that measuring accuracy is high, the error of calculation is little, easy to operate.
The conductor temperature of test intermediate head adopts built-in wireless passive temperature sensor, and the mounting means of the type sensor can be built in cable intermediate joint inside when not destroying cable insulation, directly measures cable intermediate joint conductor temperature.Simultaneously because this sensor is arranged on cable intermediate joint inside, therefore, it is possible to effectively prevent external environment from damaging and affecting, the Long-Time Service of sensor under the various severe running environment such as cable tunnel, cable duct can be allowed.Can resist outside destroy to a certain extent, but also have very general applicability, long service life, temperature measurement accuracy is high.
Joint conductor sensor is circular ring type structure, in intermediate head installation process by sensor sleeve in cable intermediate joint conductor, be convenient to assembling, construction costs is low, and be easy to promote.
Arrange environment temperature sensor, improve temperature comparisons's property, environment temperature sensor is arranged on outside the containment vessel of intermediate head, and distance protection shell 0.2m ~ 2m, improve measuring accuracy further.
Containment vessel epidermis sensor is two; be arranged symmetrically in the containment vessel two ends of intermediate head; because intermediate head containment vessel area is larger; heat dissipation environment may slightly difference; arranging two sensors is whether there is heat situation pockety to detect, and strengthens the measuring accuracy to the containment vessel of intermediate head further.
The containment vessel of intermediate head arranges heat tape, and heat tape can the impact of environmental test temperature variation butt junction internal temperature field distribution, is directly wrapped in the surface heating of containment vessel, homogeneous temperature, installs simple, easy to use, safe and reliable during use; Reometer is clamp on amperemeter, directly clamps cable under test during use, easy to use.
Accompanying drawing explanation
Fig. 1 is the utility model one-piece construction schematic diagram;
Fig. 2 is temperature sensor arrangement of the present utility model;
Fig. 3 is the utility model heat tape structural representation;
Wherein, 1, power supply, 2, pressure regulator, 3, conductor, 4, cable, 6, intermediate head, 7, fluid sealant, 8, data reception module, 9, data acquisition module, 11, current-carrying capacity collector, 12, computing machine, 13, rising current transformer, 15, reometer, 61, containment vessel, 62, prefabricated component, 63, heat tape;
T1, joint conductor sensor, T2, body conductor sensor, T3, body epidermis sensor; T4, joint epidermis sensor, T5, containment vessel epidermis sensor I, T6, containment vessel epidermis sensor II; T7, environment temperature sensor, R1, built-in signal dual-mode antenna.
Below in conjunction with embodiment, the utility model is described in further details:
Its concrete using method is:
First temperature-measuring control device is put up, various equipment is connected according to Fig. 1, power supply 1, pressure regulator 2 are connected successively with rising current transformer 13, rising current transformer 13 stube cable 4 two ends, be connected with clamp on amperemeter 15 between rising current transformer 13 and pressure regulator 2, wherein rising current transformer 13 is 51kA, and cable 4 adopts specification to be 151kV, 1200mm2, YJLW03 cable; Intermediate head 6 is the intermediate head of 151kV conductor temperature measuring type, and specification is 1200mm2; Joint conductor sensor T1 is 3MS1123TII; Intermediate head 6 comprises shrinkage prefabricated component 62 and is arranged on the copper containment vessel 61 of shrinkage prefabricated component 62 outside, copper containment vessel 61 is wound around heat tape 63, and the power lead of heat tape 63 connects power supply 1.Heat tape 63 is the glass fibre heat tape 63 that Xu Sheng Novel electric tracing Science and Technology Ltd. of Hefei City produces; there are good heat resistance and reliable insulating property; structurally flexible; the surface heating of containment vessel is directly wrapped in during use; its homogeneous temperature; install simple, easy to use, safe and reliable.
All temperature sensors are arranged according to Fig. 2, cable 4 and intermediate head 6 arrange seven temperature sensors, be respectively: the joint conductor sensor T1 on the conductor 3 in prefabricated component 62, be arranged on the body conductor sensor T2 on the conductor 3 of cable 4, be arranged on the supracutaneous body epidermis sensor T3 of cable 4, be arranged on the supracutaneous joint epidermis sensor T4 of prefabricated component 62, be symmetricly set on containment vessel epidermis sensor I T5 and containment vessel epidermis sensor II T6 at containment vessel 61 epidermis two ends, and environment temperature sensor T7, two containment vessel epidermis sensor T5 and T6 are arranged symmetrically in 1/6 place on the containment vessel 61 of intermediate head 6 and 5/6 place, the unsettled meter Chu position being placed in the containment vessel 61 of distance intermediate head of environment temperature sensor T7, multimetering is realized like this by installing respective temperature sensor at the different layers of cable 4, to improve measuring accuracy.
By cable 4, current-carrying capacity collector 11, computing machine 12 connects successively, by joint conductor sensor T1, body conductor sensor T2, body epidermis sensor T3, joint epidermis sensor T4, containment vessel epidermis sensor I T5, containment vessel epidermis sensor II T6, environment temperature sensor T7 is electrically connected data acquisition module 9 all successively, data reception module 8 and computing machine 12, its center tap conductor sensor T1 is connected with data acquisition module 9 by the SMA head of built-in signal dual-mode antenna R1, be arranged on getting on cable 4 can power for data acquisition module 9 by coil 51, get and can be designed to bayonet type by coil 51, cable 4 can be directly installed on outside, facilitate in-site installation.
Joint conductor sensor T1 is 3MS1123TII temperature sensor, body conductor sensor T2 ~ environment temperature sensor T7 is DS18B20 type temperature sensor, data acquisition module 9 is 51 single-chip microcomputers, and the data reception module 8 be connected with data acquisition module 9 is the ZigBee module of SZ05-ADV type; Current-carrying capacity collector 11 is data collecting card; Computing machine 7 is ThinkpadT430 notebook.
All presetting system sensors should intert in intermediate head installation process.The wherein installation of the joint conductor sensor T1 at conductor 3 place of intermediate head 6, should carry out before the sleeve pipe crimping of the intermediate head 6 of cable 4, the installation of the joint epidermis sensor T4 at intermediate head 6 place, should before containment vessel 61 seals, prefabricated component 62 carries out after installing, the containment vessel 61 of intermediate head is finally installed, the signal extension line R2 of built-in signal dual-mode antenna R1 and body conductor sensor T2 ~ environment temperature sensor T7 is drawn from the encapsulating mouth of containment vessel 61, between prefabricated component 62 and containment vessel 61, pour into fluid sealant 7 such as epoxy resin or polyurethane water-proof resin seal, because epoxy resin or polyurethane water-proof resin have excellent bonding strength, dielectric properties are good, prefabricated component 62 and containment vessel 61 tight seal are integrated.
Joint conductor temperature adopts the wireless conductor temperature monitoring equipment of 3MS1123TII joint, and joint, cable surface temperature, environment temperature adopt wired temperature sensor DS18B20 to test, and installs respective temperature sensor realize multimetering on 4 layers, different cable.
The temperature-measuring control device connected is utilized to test, because electric current forms loop by cable 4, the current-carrying capacity changing cable 4 carries out repeatedly revision test, Real-Time Monitoring and comparative analysis are carried out to each measuring point temperature-measuring results, and then the relation of current-carrying capacity of cable and the different cable floor temperature such as oversheath, core, conductor under acquisition different condition, and record data to computing machine 12.
Carry out single hop step current temperature rise test: dummycable from start to stable operation and electric current remains unchanged substantially time operating mode.First attempt powering up flowing to cable temperature and reaching nominal maximum temperature, determine loading current maximal value Imax, then step current 1/3Imax is loaded respectively, 1/2Imax, 2/3Imax, 5/6Imax, Imax also keeps stable, within every 51 minutes, gather a secondary data (comprising temperature value and current value), add current duration about 500 minutes and stablize to each measuring point temperature value, record now environment temperature simultaneously.Often cool (accelerating air-cooled) about 6 hours after group test, being cooled to environment temperature to each measuring point temperature can carry out lower battery of tests.According to organizing test findings, under comparing environment temperature difference, the curve of conductor current and conductor temperature, this test can be applicable to the cable of different electric pressure more.
Carry out segmentation step current temperature rise test: after dummycable 4 stable operation, operating mode when fluctuating widely appears suddenly in electric current.Loading current 1/2Imax to temperature stabilization, then increase step current to Imax, snap time is respectively 1 hour, 2 hours, 4 hours, falls electric current again and return to 1/2Imax after step, with this simulate load in actual motion meet an urgent need increase operating mode.According to test the data obtained, the temperature rise of conductor of the intermediate head 6 that segmentation step current causes and the temperature variations of other each layers, obtain each measuring point temperature rise curve of intermediate head 6, analyze the step temperature rise value of each measuring point of intermediate head and rise to time to peak, this test can be applicable to the cable of different electric pressure.
Carry out containment vessel 61 temperature rise test: the operating mode that simulated environment temperature rises sharply.Containment vessel 61 adopts copper shell; loading current 1/2Imax is to temperature stabilization; then copper shell heat tape 62 is heated; heat tape 62 parcel is wrapped on copper shell epidermis; ensure that copper shell is heated evenly; indirect heating copper shell is carried out by heating heat tape 62; analyze the intermediate head 6 each layers of measuring point temperature variations under different Cu shell temperature (40 degrees Celsius, 50 degrees Celsius, 60 degrees Celsius, 70 degrees Celsius) whereby; obtain each measuring point temperature rise curve of intermediate head 6, analyze the step temperature rise value of each measuring point of intermediate head 6 and rise to time to peak.
According to testing the data that draw, obtaining the relation of the different cable floor temperature such as current-carrying capacity of cable and oversheath, core, conductor under different condition, recording data to computing machine 12.