CN103048568B - Three-core cable laid in cable duct current-carrying method for determination of amount and certainty annuity - Google Patents

Three-core cable laid in cable duct current-carrying method for determination of amount and certainty annuity Download PDF

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CN103048568B
CN103048568B CN201210562497.7A CN201210562497A CN103048568B CN 103048568 B CN103048568 B CN 103048568B CN 201210562497 A CN201210562497 A CN 201210562497A CN 103048568 B CN103048568 B CN 103048568B
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cable
unit length
cable duct
thermal resistance
current
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CN103048568A (en
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余兆荣
牛海清
孙广慧
张群峰
赵继光
张尧
麦灿波
陈燕萍
李光明
韩存
赖景飞
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Foshan Power Supply Bureau of Guangdong Power Grid Corp
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Foshan Power Supply Bureau of Guangdong Power Grid Corp
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Abstract

The invention provides a kind of determination method and system of three-core cable laid in cable duct current-carrying capacity, its method comprises step: the correlation parameter obtaining cable duct; Determine integrated environment temperature and cable duct temperature rise; According to described integrated environment temperature and described cable duct temperature rise determination cable duct temperature; According to described cable duct temperature, medium thermal resistance around unit length cable is revised; According to the correlation performance parameters determination current-carrying capacity of cable of medium thermal resistance and cable around revised unit length cable.Effectively solve the problem that in prior art, cable duct inner cable carrying current calculation is obviously higher, cable duct cabling current-carrying capacity can be determined more accurately.

Description

Three-core cable laid in cable duct current-carrying method for determination of amount and certainty annuity
Technical field
The present invention relates to technical field of electric power, particularly relate to a kind of three-core cable laid in cable duct current-carrying method for determination of amount and certainty annuity.
Background technology
Compare the system of layings such as direct-burried, poling and cable tunnel, cable duct system of laying has reduced investment, takes up an area less, trend flexibly and can hold more cable, increase cable loop number, without the need to advantages such as work well, cable incoming-outgoing facilitate, be widely used in 10kV distribution cable.
Current-carrying capacity is one of topmost parameter of cable line, no matter its accurate Calculation is to the design of power cable or runs all important in inhibitings.Electric Design department carries out type selecting and cable line design according to current-carrying capacity to cable, and operation department controls according to the load of current-carrying capacity to cable line.
The calculating of current-carrying capacity of cable generally adopts the IEC60287 series standard of generally acknowledging in the world, and Chinese machinery industry current-carrying capacity of cable calculates series standard JB/T10181 according to IEC standard formulation.Based on the current-carrying capacity of cable computing formula in IEC60287 series standard be:
I = { Δθ - W d [ 0.5 T 1 + n ( T 2 + T 3 + T 4 ) ] R · T 1 + . nR ( 1 + λ 1 ) T 2 + nR ( 1 + λ 1 + λ 2 ) ( T 3 + T 4 ) } 0.5 - - - ( 1 )
Wherein, T 1, T 2, T 3, T 4be respectively the insulation thermal resistance between unit length cable conductor and sheath, unit length cable inner liner thermal resistance, the protective coverings of cable thermal resistance of unit length, the thermal resistance of unit length cable surrounding media, n is the conductor number being loaded with electric current in cable, for triple cable, n=3, λ 1, λ 2refer to the ratio of the ratio of protective metal shell loss and conductor total losses, armor loss and conductor total losses respectively, W dfor the dielectric loss of unit length insulation, Δ θ is the conductor surface temperature exceeding more than environment temperature.But, formula (1) is without the calculating formula in direct sunlight situation in free air, because the radiating condition of cable duct inner cable is obviously than poor in free air, making to calculate cable duct inner cable current-carrying capacity according to formula (1) obviously will higher than test findings.
Summary of the invention
The object of the present invention is to provide a kind of three-core cable laid in cable duct current-carrying method for determination of amount and certainty annuity, its reasonable contemplation cable duct lays the difference of laying with free air, and the current-carrying capacity of cable obtained is more accurate.
Object of the present invention is achieved by the following scheme:
A kind of three-core cable laid in cable duct current-carrying method for determination of amount, comprises the steps:
Obtain the correlation parameter of cable duct, the correlation parameter of described cable duct comprises the efficiently radiates heat girth of the cable duct girth being placed in soil, the cable duct girth being placed in free air, the soil moisture, Free Air Temperature, the total heat dissipation capacity of unit length cable duct, cable duct;
The cable duct girth of soil, the cable duct girth being placed in free air, the soil moisture, Free Air Temperature determination integrated environment temperature is placed in, according to the efficiently radiates heat girth determination cable duct temperature rise of the total heat dissipation capacity of described unit length cable duct, cable duct according to described;
According to described integrated environment temperature and described cable duct temperature rise determination cable duct temperature;
According to described cable duct temperature, unit length cable surrounding media thermal resistance is revised;
According to the correlation performance parameters determination current-carrying capacity of cable of revised unit length cable surrounding media thermal resistance and cable.
A determination method, system for three-core cable laid in cable duct current-carrying capacity, comprises the steps:
Cable duct parameter acquisition module, for obtaining the correlation parameter of cable duct, the correlation parameter of described cable duct comprises the efficiently radiates heat girth of the cable duct girth being placed in soil, the cable duct girth being placed in free air, the soil moisture, Free Air Temperature, the total heat dissipation capacity of unit length cable duct, cable duct;
Environment temperature determination module, for being placed in the cable duct girth of soil, the cable duct girth being placed in free air, the soil moisture, Free Air Temperature determination integrated environment temperature described in basis;
Temperature rise determination module, for the efficiently radiates heat girth determination cable duct temperature rise according to the total heat dissipation capacity of described unit length cable duct, cable duct;
Cable duct temperature determination module, according to described integrated environment temperature and described cable duct temperature rise determination cable duct temperature;
Correcting module, for revising unit length cable surrounding media thermal resistance according to described cable duct temperature;
Current-carrying capacity determination module, for the correlation performance parameters determination current-carrying capacity of cable according to revised unit length cable surrounding media thermal resistance and cable.
According to the scheme of the invention described above, after the correlation parameter obtaining cable duct, according to the described cable duct girth being placed in soil, be placed in the cable duct girth of free air, the soil moisture, Free Air Temperature determination integrated environment temperature, according to the total heat dissipation capacity of described unit length cable duct, the efficiently radiates heat girth determination cable duct temperature rise of cable duct, and according to described integrated environment temperature and described cable duct temperature rise determination cable duct temperature, according to this cable duct temperature, unit length cable surrounding media thermal resistance is revised again, according to the correlation performance parameters determination current-carrying capacity of cable of revised unit length cable surrounding media thermal resistance and cable, the cable duct temperature determined based on integrated environment temperature of the present invention is adopted to revise unit length cable surrounding media thermal resistance, cable duct cabling current-carrying capacity more accurately can be obtained.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the determination embodiment of the method for three-core cable laid in cable duct current-carrying capacity of the present invention;
The correlation curve schematic diagram of the computable value with test value of Fig. 2 cable duct temperature;
Fig. 3 is the structural representation of the certainty annuity embodiment of three-core cable laid in cable duct current-carrying capacity of the present invention;
Fig. 4 is the refined structure schematic diagram of correcting module in Fig. 3;
Fig. 5 is the refined structure schematic diagram of current-carrying capacity determination module in Fig. 3.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the invention will be further described, but embodiments of the present invention are not limited thereto.
As described in the background section, calculating current-carrying capacity by formula (1) can apparently higher than its actual value, be that different (one is the semi-enclosed cable duct being placed in soil to cable surrounding media because cable duct lays the key distinction of laying with free air, one is free air), and cable surrounding media obviously will affect unit length cable surrounding media thermal resistance, and then affect current-carrying capacity of cable I, and unit length cable surrounding media thermal resistance is mainly relevant with the temperature in cable duct.In order to calculate three-core cable laid in cable duct current-carrying capacity as far as possible accurately, the present invention solves according to integrated environment temperature, then according to this cable duct temperature to unit length cable surrounding media thermal resistance T 4revise, obtain final current-carrying capacity of cable with this.
Shown in Figure 1, be the schematic flow sheet of the determination embodiment of the method for three-core cable laid in cable duct current-carrying capacity of the present invention.As shown in Figure 1, the three-core cable laid in cable duct current-carrying method for determination of amount of the present embodiment comprises the steps:
Step S101: obtain the cable duct girth l being placed in soil 1, be placed in the cable duct girth l of free air 2, soil moisture θ soil, Free Air Temperature θ air, the total heat dissipation capacity W of unit length cable duct tOT, cable duct efficiently radiates heat girth P, enter step S102, wherein, generally can using the air themperature under tree shade as Free Air Temperature;
Step S102: according to the cable duct girth l in soil 1, be placed in the cable duct girth l of free air 2, soil moisture θ soil, Free Air Temperature θ airdetermine integrated environment temperature θ en, its computing formula for shown in formula (2), according to the total heat dissipation capacity W of unit length cable duct tOT, cable duct efficiently radiates heat girth P determine cable duct temperature rise Δ θ tr, its computing formula, for shown in formula (3), enters step S103;
θ en = l 1 l 1 + l 2 · θ soil + l 2 l 1 + l 2 · θ air - - - ( 2 )
Δθ tr = W TOT 3 P - - - ( 3 )
Step S103: according to θ=Δ θ+θ endetermine cable duct temperature θ, enter step S104;
Step S104: according to described cable duct temperature θ, unit length cable surrounding media thermal resistance is revised, enter step S105;
Step S105: according to the correlation performance parameters determination current-carrying capacity of cable of revised unit length cable surrounding media thermal resistance and cable.
Wherein, confirmed by a large amount of tests, the above-mentioned cable duct temperature obtained based on integrated environment temperature computation conforms to test measurements.In the test being test event with single loop, three loops, six loops, ten secondary circuits respectively, the actual cable duct temperature (experiment value) recorded contrasts with based on integrated environment temperature, the cable duct temperature (calculated value) that calculates based on environment Free Air Temperature, and comparing result ginseng is shown in Table 1.Shown in Fig. 1 be six return cable current-carrying capacities tests time integrated environment temperature cable duct temperature calculations, based on integrated environment temperature cable duct temperature calculations, test the temperature of cable duct recorded.
The contrast of table 1 cable duct temperature calculations and trial value
Four current-carrying capacity of cable test findings in consolidated statement 1, data from table 1, based on integrated environment temperature cable duct temperature than based on the cable duct temperature of environment Free Air Temperature closer to trial value, thus the determination of cable duct temperature should based on integrated environment temperature, instead of environment Free Air Temperature.Wherein, the error existed between the computable value with test value based on the cable duct temperature of integrated environment temperature is the error requirements meeting engineering practice.Further, also can be found out by curve in Fig. 2, trend based on the cable duct temperature calculations of integrated environment temperature and the trial value of cable duct temperature is basically identical, data are substantially identical, and it is larger based on the cable duct temperature fluctuation of environment Free Air Temperature, more with actual cable ditch temperature difference, also the determination further illustrating cable duct temperature should based on integrated environment temperature, but not based on environment Free Air Temperature.
Accordingly, according to the scheme in the present embodiment, after the correlation parameter obtaining cable duct, according to the described cable duct girth being placed in soil, be placed in the cable duct girth of free air, the soil moisture, Free Air Temperature determination integrated environment temperature, according to the total heat dissipation capacity of described unit length cable duct, the efficiently radiates heat girth determination cable duct temperature rise of cable duct, and according to described integrated environment temperature and described cable duct temperature rise determination cable duct temperature, according to this cable duct temperature, unit length cable surrounding media thermal resistance is revised again, according to the correlation performance parameters determination current-carrying capacity of cable of revised unit length cable surrounding media thermal resistance and cable, the cable duct temperature determined based on integrated environment temperature of the present invention is adopted to revise unit length cable surrounding media thermal resistance, the current-carrying capacity of cable of acquisition can be made more accurate.
After determining current-carrying capacity of cable, power department then can carry out the design of power cable according to this current-carrying capacity of cable of gained and carry out relevant control.Such as, current-carrying capacity according to cable carries out type selecting to cable, designs cable line, control according to the load of current-carrying capacity of cable to cable line, according to current-carrying capacity of cable computation period load current-carrying capacity, emergent load current-carrying capacity and carry out the energy such as emergent lower control, after this current-carrying capacity of cable of acquisition, other the design of associate power system and the control of operation can also be carried out according to this current-carrying capacity of cable, will not add to repeat at this.
Wherein, in above-mentioned steps S101, obtain the total heat dissipation capacity W of unit length cable duct tOTmode can be adopted: first determine without current-carrying capacity of cable under sunlight, free air laid condition to be, pass through without sunlight, free air laid condition hyposulculus inner cable current-carrying capacity determination ditch inner cable thermal value again, and determine the total heat dissipation capacity W of unit length cable duct by the acquisition of this ditch inner cable thermal value tOT.Wherein, electric cable heating amount mainly comprises core heating, insulating dielectric layer loss and the armor loss etc. of ditch inner cable, determine without sunlight, free air laid condition hyposulculus inner cable current-carrying capacity and utilize the total heat dissipation capacity of this ditch inner cable current-carrying capacity acquisition unit length cable duct that the corresponding formulae discovery recorded all can be adopted in IEC60287 series standard to obtain, not repeating them here.
In addition, in above-mentioned steps S104, according to described cable duct temperature θ, unit length cable surrounding media thermal resistance is revised, different implementations can be had.A concrete implementation is provided wherein: the modified value T determining unit length cable surrounding media thermal resistance according to described cable duct temperature θ in an embodiment 4', the computing formula of this modified value can as shown in formula (4), by this modified value T 4' and preset Proportional coefficient K product with according to free air without unit length cable surrounding media thermal resistance T during direct sunlight 4calculated value be added as revised unit length cable surrounding media thermal resistance T 4", i.e. revised unit length cable surrounding media thermal resistance T 4" be T 4"=KT 4"+T 4, T 4formula (5) can be passed through obtain; Wherein, h is coefficient of heat transfer, D efor the outside diameter of cable, π is circular constant, Δ θ sfor exceeding the cable surface temperature of more than environment temperature; Proportional coefficient K is preferably 0.5.
T 4 ′ = 1 π · D e · h · θ 1 4 - - - ( 4 )
T 4 = 1 π · D e · h · ( Δθ s ) 1 4 - - - ( 5 )
In addition, in above-mentioned steps S105, during correlation performance parameters determination current-carrying capacity of cable according to revised unit length cable surrounding media thermal resistance and cable, concrete calculating can based on mode expressed in the above-mentioned formula (1) of IEC60287 standard, also can be adopt other account form to carry out, but adopt above-mentioned formula (1), T should be used accordingly 4" replace T 4, for above-mentioned based on mode expressed in the above-mentioned formula (1) of IEC60287 standard, concrete mode can comprise:
Determine the correlation performance parameters of cable, described correlation performance parameters comprises the insulation thermal resistance T between unit length cable conductor and sheath 1, unit length cable inner liner thermal resistance T 2, unit length protective coverings of cable thermal resistance T 3, be loaded with the ratio λ of the conductor number n of electric current, protective metal shell loss and conductor total losses in cable 1, armor loss and conductor total losses ratio λ 2, unit length insulation dielectric loss W dand exceed the conductor surface temperature Δ θ of more than environment temperature; Again according to correlation performance parameters and the revised unit length cable surrounding media thermal resistance T of these cables 4" determine current-carrying capacity of cable, calculating formula is (6) formula, and wherein, the correlation performance parameters of cable by the thermal resistivity of the structure of cable, every layer material, can be determined according to existing formula, do not repeat them here.
I = { Δθ - W d [ 0.5 T 1 + n ( T 2 + T 3 + T 4 ′ ′ ) ] R · T 1 + nR ( 1 + λ 1 ) T 2 + nR ( 1 + λ 1 + λ 2 ) ( T 3 + T 4 ′ ′ ) } 0.5 - - - ( 6 )
The current-carrying capacity of cable adopting (6) formula to obtain and trial value are contrasted, comparing result is in table 2.As seen from Table 2, based on revised unit length cable surrounding media thermal resistance T 4" cable duct obtained lay under current-carrying capacity of cable conform to trial value.
Current-carrying capacity correction factor under table 2 cable duct different circuit
Pilot project Single loop Three loops Six loops Ten secondary circuits
Trial value 502.84 446.34 400.36 353.24
Calculated value 492.06 452.98 410.51 352.10
According to the three-core cable laid in cable duct current-carrying method for determination of amount of the invention described above, the present invention also provides a kind of certainty annuity of three-core cable laid in cable duct current-carrying capacity.As shown in Figure 3, be the structural representation of the certainty annuity embodiment of three-core cable laid in cable duct current-carrying capacity of the present invention, it comprises:
Cable duct parameter acquisition module 301, for obtaining the cable duct girth l being placed in soil 1, be placed in the cable duct girth l of free air 2, soil moisture θ soil, Free Air Temperature θ air, the total heat dissipation capacity W of unit length cable duct tOT, cable duct efficiently radiates heat girth P, wherein, generally can using the air themperature under tree shade as Free Air Temperature;
Environment temperature determination module 302, for according to the cable duct girth l in soil 1, be placed in the cable duct girth l of free air 2, soil moisture θ soil, Free Air Temperature θ airdetermine integrated environment temperature θ en, its computing formula is for shown in formula (2);
Temperature rise determination module 303, for according to the total heat dissipation capacity W of unit length cable duct tOT, cable duct efficiently radiates heat girth P determine cable duct temperature rise Δ θ tr, its computing formula is for shown in formula (3);
Cable duct temperature determination module 304, according to θ=Δ θ+θ endetermine cable duct temperature θ;
Correcting module 305, for revising unit length cable surrounding media thermal resistance according to described cable duct temperature θ;
Current-carrying capacity determination module 306, according to the correlation performance parameters determination current-carrying capacity of cable of revised unit length cable surrounding media thermal resistance and cable.
Accordingly, according to the scheme in the present embodiment, obtain the correlation parameter of cable duct in cable duct parameter acquisition module 301 after, environment temperature determination module 302 is according to the described cable duct girth being placed in soil, be placed in the cable duct girth of free air, the soil moisture, Free Air Temperature determination integrated environment temperature, temperature rise determination module 303 is according to the total heat dissipation capacity of described unit length cable duct, the efficiently radiates heat girth determination cable duct temperature rise of cable duct, cable duct temperature determination module 304 is according to described integrated environment temperature and described cable duct temperature rise determination cable duct temperature, correcting module 305 is revised unit length cable surrounding media thermal resistance according to this cable duct temperature, current-carrying capacity determination module 306 is according to the correlation performance parameters determination current-carrying capacity of cable of revised unit length cable surrounding media thermal resistance and cable, the cable duct temperature determined based on integrated environment temperature of the present invention is adopted to revise unit length cable surrounding media thermal resistance, the current-carrying capacity of cable of acquisition can be made more accurate.
After determining current-carrying capacity of cable, power department then can carry out the design of power cable according to this current-carrying capacity of cable of gained and carry out relevant control.Such as, current-carrying capacity according to cable carries out type selecting to cable, designs cable line, control according to the load of current-carrying capacity of cable to cable line, according to current-carrying capacity of cable computation period load current-carrying capacity, emergent load current-carrying capacity and carry out emergent under control etc., after this current-carrying capacity of cable of acquisition, other the design of associate power system and the control of operation can also be carried out according to this current-carrying capacity of cable, will not add to repeat at this.
Wherein, cable duct parameter acquisition module 301 obtains the total heat dissipation capacity W of unit length cable duct tOTthe mode that can adopt is: first determine without sunlight, free air laid condition hyposulculus inner cable current-carrying capacity, pass through without sunlight, free air laid condition hyposulculus inner cable current-carrying capacity determination ditch inner cable thermal value again, and determine the total heat dissipation capacity W of unit length cable duct by the acquisition of this ditch inner cable thermal value tOT.Wherein, electric cable heating amount mainly comprises core heating, insulating dielectric layer loss and the armor loss etc. of ditch inner cable, determine without sunlight, free air laid condition hyposulculus inner cable current-carrying capacity and utilize the total heat dissipation capacity of this ditch inner cable current-carrying capacity acquisition unit length cable duct all can adopt the mode recorded in IEC60287 series standard, not repeating them here.
In addition, correcting module 305 is revised unit length cable surrounding media thermal resistance according to described cable duct temperature θ, can have different implementations.Wherein in a concrete example, shown in Fig. 4 is the refined structure schematic diagram of correcting module 305, and as shown in Figure 4, above-mentioned correcting module 305 specifically can comprise:
3051 amending units, for determining the modified value T of unit length cable surrounding media thermal resistance according to described cable duct temperature θ 4', the computing formula of this modified value can as shown in formula (4);
Sum unit 3052, for by this modified value T 4' and preset Proportional coefficient K product with according to free air without unit length cable surrounding media thermal resistance T during direct sunlight 4calculated value be added as revised unit length cable surrounding media thermal resistance T 4", i.e. revised unit length cable surrounding media thermal resistance T 4" be T 4"=KT 4'+T 4, T 4can pass through formula (5) to obtain, Proportional coefficient K is preferably 0.5.
In addition, during the correlation performance parameters determination current-carrying capacity of cable of current-carrying capacity determination module 306 according to revised unit length cable surrounding media thermal resistance and cable, concrete calculating can based on mode expressed in the above-mentioned formula (1) of IEC60287 standard, also can be adopt other account form to carry out, but adopt above-mentioned formula (1), T should be used accordingly 4" replace T 4, for above-mentioned based on mode expressed in the above-mentioned formula (1) of IEC60287 standard, shown in Fig. 5 is the refined structure schematic diagram of current-carrying capacity determination module 306, and as shown in Figure 5, current-carrying capacity determination module 306 can comprise:
Cable data determining unit 3061, for determining the correlation performance parameters of cable, described correlation performance parameters comprises the insulation thermal resistance T between unit length cable conductor and sheath 1, unit length cable inner liner thermal resistance T 2, unit length protective coverings of cable thermal resistance T 3, be loaded with the ratio λ of the conductor number n of electric current, protective metal shell loss and conductor total losses in cable 1, armor loss and conductor total losses ratio λ 2, unit length insulation dielectric loss W dand exceed the conductor surface temperature Δ θ of more than environment temperature, wherein, the correlation performance parameters of cable by the thermal resistivity of the structure of cable, every layer material, can be determined according to existing formula, is not repeated them here;
Current-carrying capacity determining unit 3062, measures for cable data determining unit 3061 and obtains the correlation performance parameters of cable and revised unit length cable surrounding media thermal resistance T 4" determine current-carrying capacity of cable, calculating formula is (6) formula.
The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.

Claims (6)

1. a three-core cable laid in cable duct current-carrying method for determination of amount, is characterized in that, comprises the steps:
Obtain the correlation parameter of cable duct, the correlation parameter of described cable duct comprises the efficiently radiates heat girth of the cable duct girth being placed in soil, the cable duct girth being placed in free air, the soil moisture, Free Air Temperature, the total heat dissipation capacity of unit length cable duct, cable duct;
The cable duct girth of soil, the cable duct girth being placed in free air, the soil moisture, Free Air Temperature determination integrated environment temperature is placed in, according to the efficiently radiates heat girth determination cable duct temperature rise of the total heat dissipation capacity of described unit length cable duct, cable duct according to described;
According to described integrated environment temperature and described cable duct temperature rise determination cable duct temperature;
According to described cable duct temperature, unit length cable surrounding media thermal resistance is revised;
According to the correlation performance parameters determination current-carrying capacity of cable of revised unit length cable surrounding media thermal resistance and cable;
Wherein, describedly according to described cable duct temperature, correction is carried out to unit length cable surrounding media thermal resistance and comprises step:
According to the modified value of described cable duct temperature determination unit length cable surrounding media thermal resistance;
Using described modified value and preset scale-up factor product be added as revised unit length cable surrounding media thermal resistance according in free air without the value of unit length cable surrounding media thermal resistance during direct sunlight;
Wherein, the described correlation performance parameters determination current-carrying capacity of cable according to revised unit length cable surrounding media thermal resistance and cable comprises step:
Determine the correlation performance parameters of cable, the correlation performance parameters of described cable comprises the conductor number, the ratio of protective metal shell loss and conductor total losses, the ratio of armor loss and conductor total losses, dielectric loss that unit length insulate and the conductor surface temperature that exceedes more than environment temperature that are loaded with electric current in insulation thermal resistance between unit length cable conductor and sheath, unit length cable inner liner thermal resistance, the protective coverings of cable thermal resistance of unit length, cable;
According to the insulation thermal resistance between described unit length cable conductor and sheath, described unit length cable inner liner thermal resistance, the protective coverings of cable of described unit length, the thermal resistance of described unit length cable surrounding media, the conductor number of electric current is loaded with in described cable, the ratio of described protective metal shell loss and conductor total losses, the ratio of described armor loss and conductor total losses, the dielectric loss of described unit length insulation, exceed the conductor surface temperature of more than environment temperature and revised unit length cable surrounding media thermal resistance determination current-carrying capacity of cable.
2. three-core cable laid in cable duct current-carrying method for determination of amount according to claim 1, is characterized in that, the total heat dissipation capacity of described unit length cable duct obtains in the following way:
Determine without sunlight, free air laid condition hyposulculus inner cable current-carrying capacity;
By without sunlight, free air laid condition hyposulculus inner cable current-carrying capacity determination ditch inner cable thermal value, and obtained by this ditch inner cable thermal value and determine the total heat dissipation capacity of unit length cable duct.
3. three-core cable laid in cable duct current-carrying method for determination of amount according to claim 1, is characterized in that, described scale-up factor is 0.5.
4. a certainty annuity for three-core cable laid in cable duct current-carrying capacity, is characterized in that, comprising:
Cable duct parameter acquisition module, for obtaining the correlation parameter of cable duct, the correlation parameter of described cable duct comprises the efficiently radiates heat girth of the cable duct girth being placed in soil, the cable duct girth being placed in free air, the soil moisture, Free Air Temperature, the total heat dissipation capacity of unit length cable duct, cable duct;
Environment temperature determination module, for being placed in the cable duct girth of soil, the cable duct girth being placed in free air, the soil moisture, Free Air Temperature determination integrated environment temperature described in basis;
Temperature rise determination module, for the efficiently radiates heat girth determination cable duct temperature rise according to the total heat dissipation capacity of described unit length cable duct, cable duct;
Cable duct temperature determination module, according to described integrated environment temperature and described cable duct temperature rise determination cable duct temperature;
Correcting module, for revising unit length cable surrounding media thermal resistance according to described cable duct temperature;
Current-carrying capacity determination module, for the correlation performance parameters determination current-carrying capacity of cable according to revised unit length cable surrounding media thermal resistance and cable;
Wherein, described correcting module comprises:
Amending unit, for the modified value according to described cable duct temperature determination unit length cable surrounding media thermal resistance;
Sum unit, using described modified value and the product of scale-up factor preset be added as revised unit length cable surrounding media thermal resistance according to free air without the calculated value of unit length cable surrounding media thermal resistance during direct sunlight;
Wherein, described current-carrying capacity determination module comprises:
Cable data determining unit, for determining the correlation performance parameters of cable, the correlation performance parameters of described cable comprises the conductor number, the ratio of protective metal shell loss and conductor total losses, the ratio of armor loss and conductor total losses, dielectric loss that unit length insulate and the conductor surface temperature that exceedes more than environment temperature that are loaded with electric current in insulation thermal resistance between unit length cable conductor and sheath, unit length cable inner liner thermal resistance, the protective coverings of cable thermal resistance of unit length, cable;
Current-carrying capacity determining unit, for according to the insulation thermal resistance between described unit length cable conductor and sheath, described unit length cable inner liner thermal resistance, the protective coverings of cable of described unit length, the thermal resistance of described unit length cable surrounding media, the conductor number of electric current is loaded with in described cable, the ratio of described protective metal shell loss and conductor total losses, the ratio of described armor loss and conductor total losses, the dielectric loss of described unit length insulation, exceed the conductor surface temperature of more than environment temperature and revised unit length cable surrounding media thermal resistance determination current-carrying capacity of cable.
5. the certainty annuity of three-core cable laid in cable duct current-carrying capacity according to claim 4, it is characterized in that, described cable duct parameter acquisition module is determined without sunlight, free air laid condition hyposulculus inner cable current-carrying capacity, and by this ditch inner cable current-carrying capacity determination ditch inner cable thermal value, obtained by this ditch inner cable thermal value and determine the total heat dissipation capacity of unit length cable duct.
6. the certainty annuity of three-core cable laid in cable duct current-carrying capacity according to claim 4, is characterized in that, described scale-up factor is 0.5.
CN201210562497.7A 2012-12-21 2012-12-21 Three-core cable laid in cable duct current-carrying method for determination of amount and certainty annuity Active CN103048568B (en)

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