CN103399226A - Monitoring device and monitoring method for current capacity of maritime platform cable - Google Patents
Monitoring device and monitoring method for current capacity of maritime platform cable Download PDFInfo
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- CN103399226A CN103399226A CN2013103215725A CN201310321572A CN103399226A CN 103399226 A CN103399226 A CN 103399226A CN 2013103215725 A CN2013103215725 A CN 2013103215725A CN 201310321572 A CN201310321572 A CN 201310321572A CN 103399226 A CN103399226 A CN 103399226A
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Abstract
The invention discloses a monitoring device and a monitoring method for the current capacity of a maritime platform cable. The monitoring device comprises a power distribution cabinet, an optical-fiber grating demodulation monitoring system, a current acquisition device, transmission and relay equipment and a temperature sensor, wherein the current acquisition device is connected with the power distribution cabinet to be used for transmitting the current which is collected by the current acquisition device into the transmission and relay equipment, and an electrical signal is converted into a light signal through the transmission and relay equipment; the temperature sensor is laid on the surface of a cable, and tail fibers of the temperature sensor are gathered into an optical fiber distribution box to be connected into the optical-fiber grating demodulation monitoring system by the optical fiber distribution box through an optical cable. The monitoring method adopts the following steps of 1, collecting real-time current; 2, collecting real-time temperature; 3, carrying out calculation on the temperature and the current capacity of a conductive wire core; 4, carrying out judgment on monitoring data. According to the monitoring device and the monitoring method, dispatch and adjustment on the load of the cable can be carried out, safety in operation of the cable is guaranteed, the problem of power supply in an emergency status is solved, and reasonable utilization of the cable is realized.
Description
Technical field
The present invention relates to the current-carrying capacity of cable monitoring method, relate in particular to a kind of monitoring device and monitoring method of offshore platform cable current-carrying capacity.Belong to the oceanographic engineering field.
Background technology
Along with deepening continuously of offshore platform transformation and construction, the use amount of power cable increases considerably, and therefore, the operational management of power cable, monitoring and maintenance work become more and more important, and workload also significantly increases.For the serviceable life and the safety that guarantee the cable line that puts into operation, cable line is underrun often, causes the transmittability waste, and is very uneconomical.And because the rated current-carrying capacity of cable calculates when Projected Operational Environment is the most severe, its value is less than normal, therefore, just causes the utilization factor of cable lower.
The conductor temperature of cable and current-carrying capacity are to calculate according to cable surrounding environment factor (as: temperature) and the variation of load, its conductor temperature and the maximum current that can bear are to instruct scheduling to adjust in real time transmission power, improve the important parameter of the rate of load condensate of existing cable.That is to say, running temperature is an important parameter of cable.When cable moved under rated load, the core temperature reached permissible value.In case and the cable overload, the core temperature will sharply rise, and accelerates its insulation ag(e)ing, and thermal breakdown even occurs.Because electric current flows through conductor thread core, caused such as: core joule loss, major insulation dielectric loss and protective metal shell loss etc., these factors all easily cause the rising of cable temperature.
For the monitoring of conductor temperature, in fact, be the monitoring to the maximum temperature of the cable major insulation that directly is connected with core.When the cable insulation excess Temperature, will speed up the degree of aging of cable, the serviceable life of shortening cable, or even the breakdown accident of cable occurs, therefore, in actual monitoring, the running temperature that allows for insulation has clear and definite regulation.Usually, during the cable continuous firing, the temperature that paper insulation allows is: 65 ℃-80 ℃; Thermoplastic (as: Polyvinylchloride, tygon) more than 75 ℃ the time, because moving freely between the molecule long-chain becomes easier, causes its physical strength step-down; And crosslinked by between molecule of heat cured insulation material (as: crosslinked polyethylene, poly-the third ethene) has better machinery and heat resistance, and the maximum temperature that its continuous firing allows is: 90 ℃.Research finds, when the working temperature of crosslinked polyethylene (XLPE) cable surpass its permissible value 8% the time, its life-span will reduce by half; If surpass 15%, the life-span of cable will only be left 1/4.
The current-carrying capacity of cable refers to the cable run duration, is no more than under the normal rating temperature conditions maximum current that can carry.Be current-carrying capacity of cable research be: on the basis of the maximum running temperature of given conductor and current cable running current, calculating conductor allows the maximum current that passes through.So, must running temperature and the real-time current of cable being gathered, this carries out rational management with regard to requiring to the actual load of cable.In the type selecting of power cable with lay the stage, owing to can not the actual motion environment comprehensively being considered, usually, all according to standard ambient temperature, carry out, like this, will cause cable when environment temperature is higher, it runs on and is in superheat state, has reduced the life-span of cable operation.
During real work, for fear of above-mentioned situation occurring, the method by suitable reservation load capacity solves, but this makes the use of cable uneconomical.Therefore, no matter be from power cable inherently safe operation angle, or from the angle that electric power system dispatching needs, all need by the on-line monitoring to cable temperature and the running current that gathers current cable, and then the current-carrying capacity that completes cable calculates.
Summary of the invention
Fundamental purpose of the present invention is to overcome the above-mentioned shortcoming that prior art exists, and provide a kind of monitoring device and monitoring method of offshore platform cable current-carrying capacity, it can be according to actual motion state and running environment, in real time the load of cable is dispatched and adjusted, not only guaranteed the security of operation of cable, its on-load ability is not fully exerted, and, in some cases, can also solve the electric power supply problem under emergency in power scheduling, realized the reasonable utilization to cable; Simultaneously, can in time find the unusual condition of cable, and in time take measures, avoid the generation of accident, reach the purpose of pre-alarm.
The objective of the invention is to be realized by following technical scheme:
A kind of monitoring device of offshore platform cable current-carrying capacity, it is characterized in that: comprising: power distribution cabinet, fiber grating demodulation monitoring system, current collecting device, transmission trunking equipment, temperature sensor, wherein, current collecting device is connected with power distribution cabinet, the current delivery that current collecting device is collected, in transmission trunking equipment, converts electrical signals to light signal by transmission trunking equipment; Temperature sensor is laid on the surface of cable, and the tail optical fiber of temperature sensor is pooled in fibre distribution box, by fibre distribution box, by optical cable, is connected in the fiber grating demodulation monitoring system.
Described current collecting device is connected with the reometer in being located at power distribution cabinet.
Described temperature sensor is fiber-optical grating temperature sensor.
Described cable is positioned at power distribution cabinet.
The monitoring method of offshore platform cable current-carrying capacity according to claim 1 is characterized in that: adopt following steps:
The first step: the collection of real-time current:
Second step: implement the collection of temperature:
The 3rd step: carry out wire core temperature and current-carrying capacity and calculate; Then carry out the differentiation of Monitoring Data then.
The concrete steps of the described first step are:
(1) current delivery that current collecting device is collected is in transmission trunking equipment;
(2) by transmission trunking equipment, convert electrical signals to light signal, and be transferred in the fiber grating demodulation monitoring system.
The concrete steps of described second step are:
(1) fiber-optical grating temperature sensor is laid in to the surface of cable, and the tail optical fiber of temperature sensor is converged in fibre distribution box, then, fibre distribution box is connected with the fiber grating demodulation monitoring system;
(2) by the fiber grating demodulation monitoring system, analyze cable conductor conductor thread core temperature, cable jacket surface temperature θ s and ambient temperature θ a.
In described the 3rd step, the concrete calculation procedure of core temperature is;
1. resistance and the loss of default θ c=90 ℃ of calculating conductor core and protective metal shell;
2. in computation process, introduced iterative algorithm, according to formula:
θc-θs＝WC+1/2Wd)T1+[WC(1+λ)+Wd]T3
Calculate the conductor thread core temperature, if the core temperature that calculates, less than 90 ℃, is utilized the core temperature that calculates, replace default θ c calculating conductor core and resistance and the loss of protective metal shell, then, then calculate the conductor thread core temperature; Wherein, T1 is: cable insulation thermal resistance, the T3 of unit length are: outer jacket thermal resistance, Wc are: conductor joule loss, the Wd of unit length are: insulation dielectric loss;
3. repeat above-mentioned steps, until the conductor thread core temperature difference that twice computing in up and down obtains is less than 0.1 ℃;
In described the 3rd step, the concrete calculation procedure of the current-carrying capacity of cable is:
(1) according to the computing formula of the current-carrying capacity of cable:
I＝{[θc-θa-Wd(0.5T1+T3+T4)]/[RT1+R(1+λ)(T3+T4)]}
1/2
Calculate the current-carrying capacity of cable;
Wherein, cable insulation thermal resistance, outer jacket thermal resistance and the external environment condition thermal resistance of T1, T3, T4 difference representation unit length; Wc, Wd are respectively conductor joule loss, the insulation dielectric loss of unit length;
(2) when the conductor thread core temperature by calculating during less than 90 ℃, the recycling ambient temperature calculates the external environment condition thermal resistance T4 of cable, calculates the stable state current-carrying capacity of cable;
In described the 3rd step, the discriminant approach of Monitoring Data is: by contrasting real-time cable load current and current-carrying capacity data, set cable load current early warning value, when the difference of current-carrying capacity and load current is less than or equal to 50A, opens and report to the police.
Beneficial effect of the present invention: the present invention is owing to adopting technique scheme, it can be according to actual motion state and running environment, in real time the load of cable is dispatched and adjusted, not only guaranteed the security of operation of cable, its on-load ability is not fully exerted, and, in some cases, can also solve the electric power supply problem under emergency in power scheduling, realize the reasonable utilization to cable; Simultaneously, can in time find the unusual condition of cable, and in time take measures, avoid the generation of accident, reach the purpose of pre-alarm.
Below in conjunction with drawings and Examples, the present invention is described in detail.
The accompanying drawing explanation:
Fig. 1 is the structural representation of load monitoring of the present invention.
Fig. 2 is the calculation flow chart of cable core temperature of the present invention.
Major label description in figure:
1. power distribution cabinet, 2. reometer, 3. wireless transmission, 4. transmission trunking equipment, 5. optical cable, 6. cable, 7. temperature sensor, 8. tail optical fiber, 9. fibre distribution box, 10. fiber grating demodulation monitoring system, 11. current collecting devices, 12. hummers.
Embodiment
As shown in Figure 1, the present invention includes: power distribution cabinet 1, fiber grating demodulation monitoring system 10, current collecting device 11, transmission trunking equipment 4, temperature sensor 7, wherein, current collecting device 11 is connected with power distribution cabinet 1, the electric current that current collecting device 11 is collected is transferred in transmission trunking equipment 4 by the mode of wireless transmission 3, by transmission trunking equipment 4, converts electrical signals to light signal; Temperature sensor 7 is laid on the surface of tri-of A, B, C of cable 6, and be in the residing space of cable 6, the tail optical fiber 8 of temperature sensor 7 is pooled in fibre distribution box 9, by fibre distribution box 9, by optical cable 5, be connected in fiber grating demodulation monitoring system 10, by optical cable 5 by optical signal transmission in the current-carrying capacity software that is located at fiber grating demodulation monitoring system 10.
The present embodiment: current collecting device 11 is connected with the reometer 2 in being located at power distribution cabinet 1; Temperature sensor 7 is fiber-optical grating temperature sensor; Cable 6 is positioned at power distribution cabinet 1.
The present invention adopts following steps:
The first step: as shown in Figure 1, the collection of real-time current:
(1) current collecting device 11 is installed on the reometer 2 of power distribution cabinet 1;
(2) electric current that current collecting device 11 is collected, mode by wireless transmission 3 is transferred in transmission trunking equipment 4, by transmission trunking equipment 4, convert electrical signals to light signal, and by optical cable 5, be transferred in the current-carrying capacity software of fiber grating demodulation monitoring system 10;
(3) conductor temperature and the current-carrying capacity under the steady-state operation condition calculates according to cable; And according to current load current I and cable surface temperature θ
sCalculate the core temperature θ c of cable;
Second step: implement the collection of temperature:
(1) fiber-optical grating temperature sensor 7 is laid in to the surface of cable 6 by epoxide-resin glue, and be laid in cable 6 environment of living in, and the tail optical fiber of fiber-optical grating temperature sensor 78 is converged in fibre distribution box 9, then, by optical cable 5, fibre distribution box 9 is connected with fiber grating demodulation monitoring system 10, to reach the purpose of signal transmission;
(2) by fiber grating demodulation monitoring system 10, analyze cable jacket surface temperature θ s and ambient temperature θ a;
The 3rd step: carry out conductor thread core temperature and current-carrying capacity and calculate:
One, the correlation parameter of cable is input in the cable data interface of the monitoring of software in optical fiber grating regulating system 10, current-carrying capacity software can calculate the correlation parameter in following formula formula, thereby calculates the current-carrying capacity of cable; In parameter interface, current-carrying capacity software can calculate the correlation parameter in following formula formula, thereby calculates the current-carrying capacity of cable;
According to the conductor thread core temperature computation formula of stipulating in the IEC60287 standard:
θc-θa＝(WC+1/2Wd)T1+[WC(1+λ)+Wd](T3+T4)
Wherein, cable insulation thermal resistance, outer jacket thermal resistance and the external environment condition thermal resistance of T1, T3, T4 difference representation unit length; Wc, Wd are respectively conductor joule loss, the insulation dielectric loss of unit length;
Because external environment condition thermal resistance T4 calculates comparatively complicated, and affected by environment larger, therefore cable surface temperature, the Real-time Load Current calculation conductor thread core temperature utilized of the design, simultaneously, consider the impact of temperature on conductor thread core protective metal shell constant resistance, in computation process, introduce iterative algorithm.Owing to avoiding using T4, and make the calculating of conductor thread core temperature can not be subjected to the impact of cable laying environment, and it is more accurate that result of calculation is compared with the IEC60287 standard method, its computing formula is shown below:
θc-θs＝(WC+1/2Wd)T1+[WC(1+λ)+Wd]T3
Two, as shown in Figure 2, calculate the core temperature, and finally calculate current-carrying capacity of cable according to the core temperature;
During 1. due to calculating conductor joule loss and protective metal shell loss, need to consider the situation of change of electrical resistance temperature, therefore, first resistance and the loss of default θ c=90 ℃ of calculating conductor core and protective metal shell here,
2. according to formula:
θc-θs＝WC+1/2Wd)T1+[WC(1+λ)+Wd]T3
Calculate the conductor thread core temperature, if the core temperature that calculates, less than 90 ℃, is utilized the core temperature that calculates, replace default θ c calculating conductor core and resistance and the loss of protective metal shell, then, then calculate the conductor thread core temperature;
3. repeat above-mentioned steps, until the conductor thread core temperature difference that twice computing in up and down obtains is less than 0.1 ℃;
When the conductor thread core temperature by calculating, during less than 90 ℃, mean that namely the rate of load condensate of cable is less than 100%, next, the recycling ambient temperature calculates the external environment condition thermal resistance T4 of cable, then, and according to formula:
I＝{[θc-θa-Wd(0.5T1+T3+T4)]/[RT1+R(1+λ)(T3+T4)]}
1/2
Calculate the stable state current-carrying capacity of cable.
Three, after wire core temperature and current-carrying capacity calculate and complete, carry out again the differentiation of Monitoring Data: by contrasting real-time cable load current and current-carrying capacity data, set cable load current early warning value, generally, when the difference of current-carrying capacity and load current is less than or equal to 50A, hummer 12 in monitoring system 10 can be opened and report to the police, and sounds.
Advantage of the present invention is:
1) the present invention has realized the monitoring to the real-time load-bearing capacity of current cable, and the load of cable is dispatched and adjusted; Not only can guarantee the security of operation of cable, its on-load ability is not fully exerted, and, can effectively avoid the generation of overload situations, and utilize underloading; Thereby, improved the utilization ratio of cable, ensured circuit stable operation, aspect the management of electrical network and optimization, playing important effect;
2) the present invention for measuring the surface temperature of cable, has improved sensitivity, stability, adverse environment resistant, anti-electromagnetic interference (EMI) that cable is measured by the light grating temperature sensor, has long service life, easy for installation, the characteristics such as little take up room;
3) the present invention utilizes the iterative algorithm of surface temperature and the load current calculating conductor core temperature of cable, and it is not owing to needing to consider the impact of complicated external environment condition on the cable diabatic process, and therefore, it is more accurate, easy to make to calculate.
The above, it is only preferred embodiment of the present invention, not the present invention is done to any pro forma restriction, every foundation technical spirit of the present invention, to any simple modification, equivalent variations and modification that above embodiment does, all still belongs in the scope of technical solution of the present invention.
Claims (8)
1. the monitoring device of an offshore platform cable current-carrying capacity, it is characterized in that: comprising: power distribution cabinet, fiber grating demodulation monitoring system, current collecting device, transmission trunking equipment, temperature sensor, wherein, current collecting device is connected with power distribution cabinet, the current delivery that current collecting device is collected, in transmission trunking equipment, converts electrical signals to light signal by transmission trunking equipment; Temperature sensor is laid on the surface of cable, and the tail optical fiber of temperature sensor is pooled in fibre distribution box, by fibre distribution box, by optical cable, is connected in the fiber grating demodulation monitoring system.
2. the monitoring device of offshore platform cable current-carrying capacity according to claim 1, it is characterized in that: described current collecting device is connected with the reometer in being located at power distribution cabinet.
3. the monitoring device of offshore platform cable current-carrying capacity according to claim 1, it is characterized in that: described temperature sensor is fiber-optical grating temperature sensor.
4. the monitoring device of offshore platform cable current-carrying capacity according to claim 1, it is characterized in that: described cable is positioned at power distribution cabinet.
5. the monitoring method of offshore platform cable current-carrying capacity according to claim 1 is characterized in that: adopt following steps:
The first step: the collection of real-time current:
Second step: implement the collection of temperature:
The 3rd step: carry out wire core temperature and current-carrying capacity and calculate; Then carry out the differentiation of Monitoring Data then.
6. the monitoring method of offshore platform cable current-carrying capacity according to claim 5, it is characterized in that: the concrete steps of the described first step are:
(1) current delivery that current collecting device is collected is in transmission trunking equipment;
(2) by transmission trunking equipment, convert electrical signals to light signal, and be transferred in the fiber grating demodulation monitoring system.
7. the monitoring method of offshore platform cable current-carrying capacity according to claim 5, it is characterized in that: the concrete steps of described second step are:
(1) fiber-optical grating temperature sensor is laid in to the surface of cable, and the tail optical fiber of temperature sensor is converged in fibre distribution box, then, fibre distribution box is connected with the fiber grating demodulation monitoring system;
(2) by the fiber grating demodulation monitoring system, analyze cable conductor conductor thread core temperature, cable jacket surface temperature θ s and ambient temperature θ a.
8. the monitoring method of offshore platform cable current-carrying capacity according to claim 5 is characterized in that: in described the 3rd step, the concrete calculation procedure of core temperature is;
1. resistance and the loss of default θ c=90 ℃ of calculating conductor core and protective metal shell;
2. in computation process, introduced iterative algorithm, according to formula:
θc-θs＝WC+1/2Wd)T1+[WC(1+λ)+Wd]T3
Calculate the conductor thread core temperature, if the core temperature that calculates, less than 90 ℃, is utilized the core temperature that calculates, replace default θ c calculating conductor core and resistance and the loss of protective metal shell, then, then calculate the conductor thread core temperature; Wherein, T1 is: cable insulation thermal resistance, the T3 of unit length are: outer jacket thermal resistance, Wc are: conductor joule loss, the Wd of unit length are: insulation dielectric loss;
3. repeat above-mentioned steps, until the conductor thread core temperature difference that twice computing in up and down obtains is less than 0.1 ℃;
In described the 3rd step, the concrete calculation procedure of the current-carrying capacity of cable is:
(1) according to the computing formula of the current-carrying capacity of cable:
I＝{[θc-θa-Wd(0.5T1+T3+T4)]/[RT1+R(1+λ)(T3+T4)]}
1/2
Calculate the current-carrying capacity of cable;
Wherein, cable insulation thermal resistance, outer jacket thermal resistance and the external environment condition thermal resistance of T1, T3, T4 difference representation unit length; Wc, Wd are respectively conductor joule loss, the insulation dielectric loss of unit length;
(2) when the conductor thread core temperature by calculating during less than 90 ℃, the recycling ambient temperature calculates the external environment condition thermal resistance T4 of cable, calculates the stable state current-carrying capacity of cable;
In described the 3rd step, the discriminant approach of Monitoring Data is: by contrasting real-time cable load current and current-carrying capacity data, set cable load current early warning value, when the difference of current-carrying capacity and load current is less than or equal to 50A, opens and report to the police.
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| CN103913652A (en) * | 2014-03-10 | 2014-07-09 | 华南理工大学 | Steady-state iteration measuring method for current-carrying capacity of cable |
| CN104459380A (en) * | 2014-11-20 | 2015-03-25 | 广州供电局有限公司 | Method and system for measuring cable load carrying capacity |
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| CN104459380A (en) * | 2014-11-20 | 2015-03-25 | 广州供电局有限公司 | Method and system for measuring cable load carrying capacity |
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| CN107102240A (en) * | 2017-05-19 | 2017-08-29 | 中国电力科学研究院 | A kind of system and method for being used to carry out optical fiber composite low-voltage cable fault diagnosis |
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| CN108008245B (en) * | 2017-11-22 | 2020-01-03 | 华北电力大学（保定） | Submarine cable insulation fault monitoring method based on photoelectric composite submarine cable temperature field |
| CN111896839A (en) * | 2020-07-14 | 2020-11-06 | 国核电力规划设计研究院有限公司 | Platform and method for testing current-carrying capacity of submarine cable in temperature field |
| CN112485557A (en) * | 2020-11-03 | 2021-03-12 | 国网辽宁省电力有限公司电力科学研究院 | Three-phase coaxial high-temperature superconducting cable system current-carrying capacity and temperature monitoring device and method |
| CN112485557B (en) * | 2020-11-03 | 2024-05-31 | 国网辽宁省电力有限公司电力科学研究院 | Current-carrying capacity and temperature monitoring device and method for three-phase coaxial high-temperature superconducting cable system |
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