CN104407247B - Two determination method and apparatus of parallel direct-burried cabling current-carrying capacity - Google Patents
Two determination method and apparatus of parallel direct-burried cabling current-carrying capacity Download PDFInfo
- Publication number
- CN104407247B CN104407247B CN201410687390.4A CN201410687390A CN104407247B CN 104407247 B CN104407247 B CN 104407247B CN 201410687390 A CN201410687390 A CN 201410687390A CN 104407247 B CN104407247 B CN 104407247B
- Authority
- CN
- China
- Prior art keywords
- cable
- temperature rise
- burried
- produced
- parallel direct
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000004020 conductor Substances 0.000 claims description 36
- 238000009413 insulation Methods 0.000 claims description 30
- 238000009434 installation Methods 0.000 claims description 25
- 230000005611 electricity Effects 0.000 claims description 13
- 230000005540 biological transmission Effects 0.000 claims description 12
- 239000002689 soil Substances 0.000 claims description 12
- 230000004888 barrier function Effects 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Laying Of Electric Cables Or Lines Outside (AREA)
Abstract
The invention discloses a kind of two determination method and apparatus of parallel direct-burried cabling current-carrying capacity, the stable state thermal circuit model of two unit cables in two parallel direct-burried cablings is connected first with thermal resistance T, obtains two stable state thermal circuit models of parallel direct-burried cabling；It is then based on the stable state thermal circuit model of above-mentioned two parallel direct-burried cablings and obtains the temperature rise that a cable in two parallel direct-burried cablings produces to another cable and the temperature rise that every cable itself is produced；The temperature rise and the temperature rise of every cable itself generation produced to another cable further according to an above-mentioned cable obtain the every overall temperature rise of cable；Finally determine the every current-carrying capacity of cable in two parallel direct-burried cablings using the overall temperature rise of above-mentioned every cable.The present invention is set up two thermal circuit models of parallel direct-burried cabling and is determined the wherein every current-carrying capacity of cable using existing unit cable stable state thermal circuit model and Re Lu and the interlinking of circuit, simple, accurate, is adapted to application.
Description
Technical field
The present invention relates to power cable technical field, more particularly to a kind of two parallel direct-burried cabling current-carrying capacities
Determine method and apparatus.
Background technology
With urban construction and the development of power industry, application of the power cable line in the electric line of city is more next
More extensive, many directly buried installation modes are increasingly becoming the major way of cable installation.To make full use of power cable
The transmission capacity on road, improves the utilization rate of cable, the accurate thermo parameters method for calculating cable run, according to the tolerance of cable insulation
Temperature determines that current-carrying capacity is increasingly becoming the problem that electric dispatching department is urgently paid close attention to.
Current-carrying capacity is an important parameter of power cable, and it refers to the Long-term service temperature that insulating barrier born and does not surpass
Cross the maximum operating currenbt corresponding to rated value.In power transmission, the maximum operating currenbt of cable run can not be more than cable
Current-carrying capacity, will otherwise impact to cable life.Further, the size of actual load electric current affects the temperature of cable insulation
Degree, load current is bigger, and insulating barrier temperature is higher；Conversely, insulating barrier temperature is lower.When load current is more than current-carrying capacity for a long time
When, it will accelerate the aging of isolation material, shorten the service life of cable.When but conductor operating temperature does not reach rated value,
The cross-section of cable is then not fully utilized, and causes the waste of resource.So ensure cable insulation it is without damage in advance under, should
The current-carrying capacity of many directly buried installation distribution cables is calculated when using existing condition, to give full play to the current-carrying energy of cable
Power, it is ensured that power cable is safe and reliable in life cycle, stable operation.
The content of the invention
Based on above-mentioned situation, the present invention proposes a kind of two parallel direct-burried cabling current-carrying method for determination of amount, side
Method is simple, accurate, according to the method can to multi-cable lays jointly from now on when the calculating of current-carrying capacity of cable foundation is provided,
It is adapted to application.
To achieve these goals, the embodiment of technical solution of the present invention is：
A kind of two parallel direct-burried cabling current-carrying method for determination of amount, comprise the following steps：
The stable state thermal circuit model series connection of two unit cables in two parallel direct-burried cablings is obtained using thermal resistance Tr
The stable state thermal circuit model of two parallel direct-burried cablings, wherein thermal resistance Tr is in described two parallel direct-burried cablings
The soil thermal resistance along cable unit length between two unit cables；
Stable state thermal circuit model based on described two parallel direct-burried cablings obtains described two parallel directly buried installation electricity
The temperature rise that the temperature rise and every cable itself that a cable is produced to another cable in cable are produced；
The temperature rise produced to another cable according to a cable in described two parallel direct-burried cablings and every electricity
The temperature rise that cable itself is produced obtains the every overall temperature rise of cable in described two parallel direct-burried cablings；
Determine that two parallel direct-burrieds are applied using the overall temperature rise of every cable in described two parallel direct-burried cablings
If the every current-carrying capacity of cable in cable.
For prior art problem, the invention allows for a kind of two determination dresses of parallel direct-burried cabling current-carrying capacity
Put, simple structure, low cost meet practical application.
The embodiment of technical solution of the present invention is：
A kind of determining device of two parallel direct-burried cabling current-carrying capacities, including：
Model sets up unit, for utilizing thermal resistance Tr by the stable state of two unit cables in two parallel direct-burried cablings
Thermal circuit model is connected, and obtains the described two stable state thermal circuit models of parallel direct-burried cabling, and wherein thermal resistance Tr is described two
The soil thermal resistance along cable unit length in parallel direct-burried cabling between two unit cables；
Temperature rise acquiring unit, described two are obtained for the stable state thermal circuit model based on described two parallel direct-burried cablings
The temperature rise that the temperature rise and every cable itself that a cable is produced to another cable in the parallel direct-burried cabling of root are produced；
The temperature rise acquiring unit is additionally operable to according to a cable in described two parallel direct-burried cablings to another
The temperature rise that the temperature rise and every cable itself that cable is produced are produced obtains every cable in described two parallel direct-burried cablings
Overall temperature rise；
Current-carrying capacity determining unit, for being determined using the every overall temperature rise of cable in described two parallel direct-burried cablings
The every current-carrying capacity of cable in two parallel direct-burried cablings.
Compared with prior art, beneficial effects of the present invention are：Two parallel direct-burried cabling current-carrying capacities of the present invention
Determine method and apparatus, using existing unit cable stable state thermal circuit model and Re Lu and the interlinking of circuit, set up two
The thermal circuit model of parallel direct-burried cabling, determine the every current-carrying capacity of cable in two parallel direct-burried cablings, it is simple, accurate
Really, according to the method can to multi-cable lays jointly from now on when current-carrying capacity of cable calculating provide foundation, with very high
Application value.
Brief description of the drawings
Fig. 1 is two determination method flow diagrams of parallel direct-burried cabling current-carrying capacity in one embodiment；
Fig. 2 is based on two determination sides of parallel direct-burried cabling current-carrying capacity in method one shown in Fig. 1 specific example
Method flow chart；
Fig. 3 is the stable state thermal circuit model of existing single 10kV three-core cables；
Fig. 4 is two stable state thermal circuit models of parallel directly buried installation 10KV three-core cables in one embodiment；
Fig. 5 is two determination apparatus structure schematic diagrams of parallel direct-burried cabling current-carrying capacity in one embodiment.
Specific embodiment
To make the objects, technical solutions and advantages of the present invention become more apparent, below in conjunction with drawings and Examples, to this
Invention is described in further detail.It should be appreciated that specific embodiment described herein is only used to explain the present invention,
Do not limit protection scope of the present invention.
Two parallel direct-burried cabling current-carrying method for determination of amount in one embodiment, as shown in figure 1, including following step
Suddenly：
Step S101：Using thermal resistance Tr by the stable state thermal circuit model of two unit cables in two parallel direct-burried cablings
Series connection, obtains the described two stable state thermal circuit models of parallel direct-burried cabling, and wherein thermal resistance Tr is two parallel direct-burrieds
The soil thermal resistance along cable unit length in cabling between two unit cables；
Step S102：Stable state thermal circuit model based on described two parallel direct-burried cablings obtains two straight parallels
Bury the temperature rise that a cable in cabling produces to another cable and the temperature rise that every cable itself is produced；
Step S103：According to the temperature rise that a cable in described two parallel direct-burried cablings is produced to another cable
The temperature rise produced with every cable itself obtains the every overall temperature rise of cable in described two parallel direct-burried cablings；
Step S104：Determine that described two are put down using the overall temperature rise of every cable in described two parallel direct-burried cablings
The every current-carrying capacity of cable in row directly buried installation cable.
It is evidenced from the above discussion that, two parallel direct-burried cabling current-carrying method for determination of amount of the invention, method is simple, accurate
Really, according to the method can to multi-cable lays jointly from now on when the calculating of current-carrying capacity of cable foundation is provided, be adapted to actual
Using.
Used as one embodiment, the stable state thermal circuit model based on described two parallel direct-burried cablings obtains described two
A cable is produced to another cable in parallel direct-burried cabling temperature rise and the every step of the temperature rise of cable itself generation
Suddenly include：
Two single No. 1 cables in two parallel direct-burried cablings, No. 2 cables are 10KV three-core cables, base
Pass through formula Q=3Q in two stable state thermal circuit models of parallel directly buried installation 10KV three-core cablesd2+3(1+λ12+λ2)2Qc2Obtain 2
The total heat flow of number cable transmission, wherein Q is No. 2 total heat flows of cables transmission, Qd2It is No. 2 cable insulations and insulation shielding
The dielectric loss of layer, λ12It is No. 2 loss factors of cable metallic screens floor, λ22It is No. 2 loss factors of cable sheath, Qc2
It is the loss that No. 2 cable conductors and conductor shield are produced,I2It is the electric current that No. 2 cables pass through, R2It is No. 2 electricity
The resistance of cable unit length；
By formulaNo. 2 cables are obtained to No. 1 cable meter
The temperature rise that skin is produced, whereinIt is the temperature rise that No. 2 cables are produced to No. 1 cable skin, θ02It is No. 2 skin temperatures of cable, T
It is the soil along cable unit length in described two parallel directly buried installation 10KV three-core cables between No. 1 cable and No. 2 cables
Earth thermal resistance；
By formula
The temperature rise that No. 2 cables are produced to No. 1 cable conductor is obtained, whereinIt is the temperature rise that No. 2 cables are produced to No. 1 cable conductor, T12
It is No. 2 thermal resistances of cable insulation, T22It is No. 2 cable filling floor and the thermal resistance of inner sheath, T32It is No. 2 heat of cable jacket
Resistance；
By by formula θ '11-θ21=T11/3×(3Qc1+3Qd1/2)、θ21-θ31=T21×[3Qd1+3(1+λ11)Qc1]、
θ31-θ01=T31×[3Qd1+3(1+λ11+λ21)Qc1] three formulas are added and obtain the temperature rise that No. 1 cable itself is produced：θ’11=θ01+T11
(Qc1+Qd1/2)+3T21[Qc1(1+λ11)+Qd1]+3T31[Qc1(1+λ11+λ21)+Qd1], wherein θ '11For No. 1 cable itself is produced
Temperature rise, θ21It is No. 1 cable metallic screens floor temperature, T11It is No. 1 cable insulation thermal resistance, Qc1It is No. 1 cable conductor and conductor screen
Cover the loss of layer generation, Qd1It is No. 1 cable insulation and the dielectric loss of insulation screen, θ31It is No. 1 cable sheath temperature
Degree, T21It is No. 1 cable filling floor and inner sheath thermal resistance, λ11It is No. 1 loss factor of cable metallic screens floor, θ01It is No. 1 cable
Skin temperature, T31It is No. 1 cable jacket thermal resistance, λ21It is No. 1 loss factor of cable sheath,I1It is No. 1
The electric current that cable passes through, R1It is No. 1 resistance of cable unit length；
According to the two stable state thermal circuit models of parallel direct-burried cabling set up, 2 are accurately obtained using above-mentioned formula
The temperature rise that the temperature rise and No. 1 cable itself that number cable is produced to No. 1 cable are produced, it is ensured that subsequent treatment is normally run, being adapted to should
With.
As one embodiment, another cable is produced according to a cable in described two parallel direct-burried cablings
The temperature rise that produces of temperature rise and every cable itself obtain the every overall temperature rise of cable in two parallel direct-burried cablings
The step of include：
Based on the temperature rise that No. 2 cables are produced to No. 1 cable conductorThe temperature rise θ produced with No. 1 cable itself
‘11, No. 1 overall temperature rise of cable is obtained according to principle of stacking：Simply, accurately, application value is high.
As one embodiment, described in the every overall temperature rise of cable determines in described two parallel direct-burried cablings
Include the step of the current-carrying capacity of every cable in two parallel direct-burried cablings：
Using the overall temperature rise θ of No. 1 cable11By formula
Determine No. 1 current-carrying capacity of cable；
In determining two parallel direct-burried cablings using the overall temperature rise of every cable in two parallel direct-burried cablings
The every current-carrying capacity of cable, can give full play to the current capacity of cable, it is ensured that power cable in life cycle safety, can
By, stable operation, meet reality.
In order to more fully understand this method, the parallel direct-burried cabling current-carrying capacity of a present invention two detailed below
Determination method application example, the application example using 10KV three-core cables realize.
As shown in Fig. 2 the application example may comprise steps of：
Step S201：The stable state of two single No. 1 and No. 2 10KV three-core cables in known two parallel direct-burried cablings
Thermal circuit model obtains two as shown in figure 3, the stable state thermal circuit model of No. 1 and No. 2 10KV three-core cable is connected by thermal resistance T
The stable state thermal circuit model of parallel directly buried installation 10KV three-core cables, as shown in figure 4, wherein thermal resistance T is No. 1 cable and No. 2 cables
Between the soil thermal resistance along cable unit length；
Step S202：Stable state thermal circuit model based on above-mentioned two parallel directly buried installation 10KV three-core cables obtains No. 2 electricity
The temperature rise that the temperature rise and No. 1 cable itself that cable is produced to No. 1 cable are produced, specifically includes：
By formula Q=3Qd2+3(1+λ12+λ22)Qc2No. 2 total heat flows of cable transmission are obtained, wherein Q is No. 2 cables
The total heat flow of transmission, Qd2It is No. 2 cable insulations and the dielectric loss of insulation screen, λ12It is No. 2 cable metallic screens floor
Loss factor, λ22It is No. 2 loss factors of cable sheath, Qc2For the damage that No. 2 cable conductors and conductor shield are produced
Consumption,I2It is the electric current that No. 2 cables pass through, R2It is No. 2 resistance of cable unit length；
By formulaNo. 2 cables are obtained to No. 1 cable meter
The temperature rise that skin is produced, whereinIt is the temperature rise that No. 2 cables are produced to No. 1 cable skin, θ02It is No. 2 skin temperatures of cable, T
It is the soil along cable unit length in described two parallel directly buried installation 10KV three-core cables between No. 1 cable and No. 2 cables
Earth thermal resistance；
By formula
The temperature rise that No. 2 cables are produced to No. 1 cable conductor is obtained, whereinIt is the temperature rise that No. 2 cables are produced to No. 1 cable conductor, T12
It is No. 2 thermal resistances of cable insulation, T22It is No. 2 cable filling floor and the thermal resistance of inner sheath, T32It is No. 2 heat of cable jacket
Resistance；
By by formula θ '11-θ21=T11/3×(3Qc1+3Qd1/2)、θ21-θ31=T21×[3Qd1+3(1+λ11)Qc1]、
θ31-θ01=T31×[3Qd1+3(1+λ11+λ21)Qc1] three formulas are added and obtain the temperature rise that No. 1 cable itself is produced：θ’11=θ01+T11
(Qc1+Qd1/2)+3T21[Qc1(1+λ11)+Qd1]+3T31[Qc1(1+λ11+λ21)+Qd1], wherein θ '11For No. 1 cable itself is produced
Temperature rise, θ21It is No. 1 cable metallic screens floor temperature, T11It is No. 1 cable insulation thermal resistance, Qc1It is No. 1 cable conductor and conductor screen
Cover the loss of layer generation, Qd1It is No. 1 cable insulation and the dielectric loss of insulation screen, θ31It is No. 1 cable sheath temperature
Degree, T21It is No. 1 cable filling floor and inner sheath thermal resistance, λ11It is No. 1 loss factor of cable metallic screens floor, θ01It is No. 1 cable
Skin temperature, T31It is No. 1 cable jacket thermal resistance, λ21It is No. 1 loss factor of cable sheath,I1It is No. 1
The electric current that cable passes through, R1It is No. 1 resistance of cable unit length；
Step S203：Based on the temperature rise that above-mentioned No. 2 cables are produced to No. 1 cable conductorProduced with No. 1 cable itself
Temperature rise θ '11, No. 1 overall temperature rise of cable in two parallel directly buried installation 10KV three-core cables is obtained according to principle of stacking：
Step S204：Using No. 1 overall temperature rise θ of cable in above-mentioned two parallel directly buried installation 10KV three-core cables11Pass through
FormulaDetermine No. 1 current-carrying capacity of cable.
This application example is communicated using existing single 10KV three-core cables stable state thermal circuit model and Re Lu and circuit
Property, set up two thermal circuit models of parallel directly buried installation 10KV three-core cables, determine the two parallel cores of directly buried installation 10KV tri- electricity
The every current-carrying capacity of cable in cable, it is simple, accurate, according to the method can to multi-cable lays jointly from now on when cable carry
The calculating of flow provides foundation, with application value very high.
Two determining devices of parallel direct-burried cabling current-carrying capacity in one embodiment, as shown in figure 5, including：
Model sets up unit, for utilizing thermal resistance Tr by the stable state of two unit cables in two parallel direct-burried cablings
Thermal circuit model is connected, and obtains the described two stable state thermal circuit models of parallel direct-burried cabling, and wherein thermal resistance Tr is described two
The soil thermal resistance along cable unit length in parallel direct-burried cabling between two unit cables；
Temperature rise acquiring unit, described two are obtained for the stable state thermal circuit model based on described two parallel direct-burried cablings
The temperature rise that the temperature rise and every cable itself that a cable is produced to another cable in the parallel direct-burried cabling of root are produced；
The temperature rise acquiring unit is additionally operable to according to a cable in described two parallel direct-burried cablings to another
The temperature rise that the temperature rise and every cable itself that cable is produced are produced obtains every cable in described two parallel direct-burried cablings
Overall temperature rise；
Current-carrying capacity determining unit, for being determined using the every overall temperature rise of cable in described two parallel direct-burried cablings
The every current-carrying capacity of cable in two parallel direct-burried cablings.
As shown in figure 5, first model set up unit using thermal resistance Tr two in two parallel direct-burried cablings are single
The stable state thermal circuit model series connection of cable, obtains two stable state thermal circuit models of parallel direct-burried cabling；Then temperature rise obtains single
Stable state thermal circuit model of the unit based on above-mentioned two parallel direct-burried cablings obtains an electricity in two parallel direct-burried cablings
The temperature rise that the temperature rise and every cable itself that cable is produced to another cable are produced, and according in two parallel direct-burried cablings
The temperature rise that the temperature rise and every cable that a piece cable is produced to another cable itself are produced obtains two parallel directly buried installation electricity
The every overall temperature rise of cable in cable；Last current-carrying capacity determining unit is using every cable in above-mentioned two parallel direct-burried cablings
Overall temperature rise determine the every current-carrying capacity of cable in two parallel direct-burried cablings.
It is evidenced from the above discussion that, two determining devices of parallel direct-burried cabling current-carrying capacity of the invention, simple structure, into
This is low, meets practical application.
Used as one embodiment, two single No. 1 cables in two parallel direct-burried cablings, No. 2 cables are
10KV three-core cables, the temperature rise acquiring unit is based on two stable state thermal circuit models of parallel directly buried installation 10KV three-core cables and leads to
Cross formula Q=3Qd2+3(1+λ12+λ22)Qc2No. 2 total heat flows of cable transmission are obtained, wherein Q is No. 2 total heats of cable transmission
Flow, Qd2It is No. 2 cable insulations and the dielectric loss of insulation screen, λ12For No. 2 losses of cable metallic screens floor because
Element, λ22It is No. 2 loss factors of cable sheath, Qc2It is the loss that No. 2 cable conductors and conductor shield are produced,I2It is the electric current that No. 2 cables pass through, R2It is No. 2 resistance of cable unit length；
By formulaNo. 2 cables are obtained to No. 1 cable meter
The temperature rise that skin is produced, whereinIt is the temperature rise that No. 2 cables are produced to No. 1 cable skin, θ02It is No. 2 skin temperatures of cable, T
It is the soil along cable unit length in described two parallel directly buried installation 10KV three-core cables between No. 1 cable and No. 2 cables
Earth thermal resistance；
By formula
The temperature rise that No. 2 cables are produced to No. 1 cable conductor is obtained, whereinIt is the temperature rise that No. 2 cables are produced to No. 1 cable conductor, T12
It is No. 2 thermal resistances of cable insulation, T22It is No. 2 cable filling floor and the thermal resistance of inner sheath, T32It is No. 2 heat of cable jacket
Resistance；
By by formulaθ21-θ31=T21×[3Qd1+3(1+λ11)Qc1]、
θ31-θ01=T31×[3Qd1+3(1+λ11+λ21)Qc1] three formulas are added and obtain the temperature rise that No. 1 cable itself is produced：θ’11=θ01+T11
(Qc1+Qd1/2)+3T21[Qc1(1+λ11)+Qd1]+3T31[Qc1(1+λ11+λ21)+Qd1], wherein θ '11For No. 1 cable itself is produced
Temperature rise, θ21It is No. 1 cable metallic screens floor temperature, T11It is No. 1 cable insulation thermal resistance, Qc1It is No. 1 cable conductor and conductor screen
Cover the loss of layer generation, Qd1It is No. 1 cable insulation and the dielectric loss of insulation screen, θ31It is No. 1 cable sheath temperature
Degree, T21It is No. 1 cable filling floor and inner sheath thermal resistance, λ11It is No. 1 loss factor of cable metallic screens floor, θ01It is No. 1 cable
Skin temperature, T31It is No. 1 cable jacket thermal resistance, λ21It is No. 1 loss factor of cable sheath,I1It is No. 1
The electric current that cable passes through, R1It is No. 1 resistance of cable unit length；
According to the two stable state thermal circuit models of parallel direct-burried cabling set up, 2 are accurately obtained using above-mentioned formula
The temperature rise that the temperature rise and No. 1 cable itself that number cable is produced to No. 1 cable are produced, it is ensured that subsequent treatment is normally run, being adapted to should
With.
Used as one embodiment, the temperature rise acquiring unit is based on the temperature rise that No. 2 cables are produced to No. 1 cable conductorThe temperature rise θ ' produced with No. 1 cable itself11, No. 1 overall temperature rise of cable is obtained according to principle of stacking：
Simply, accurately, application value is high.
Used as one embodiment, the current-carrying capacity determining unit utilizes the overall temperature rise θ of No. 1 cable11By formulaDetermine No. 1 current-carrying capacity of cable；
In determining two parallel direct-burried cablings using the overall temperature rise of every cable in two parallel direct-burried cablings
The every current-carrying capacity of cable, can give full play to the current capacity of cable, it is ensured that power cable in life cycle safety, can
By, stable operation, meet reality.
Embodiment described above only expresses several embodiments of the invention, and its description is more specific and detailed, but simultaneously
Therefore the limitation to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that for one of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention
Shield scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (8)
1. a kind of two parallel direct-burried cabling current-carrying method for determination of amount, it is characterised in that comprise the following steps：
The stable state thermal circuit model of two unit cables in two parallel direct-burried cablings is connected using thermal resistance Tr, obtains described
Two stable state thermal circuit models of parallel direct-burried cabling, wherein thermal resistance Tr is two lists in described two parallel direct-burried cablings
The soil thermal resistance along cable unit length between root cable；
Stable state thermal circuit model based on described two parallel direct-burried cablings is obtained in described two parallel direct-burried cablings
The temperature rise that the temperature rise and every cable itself that a piece cable is produced to another cable are produced；
The temperature rise produced to another cable according to a cable in described two parallel direct-burried cablings and every cable are certainly
The temperature rise that body is produced obtains the every overall temperature rise of cable in described two parallel direct-burried cablings；
Determine described two parallel directly buried installation electricity using the overall temperature rise of every cable in described two parallel direct-burried cablings
The every current-carrying capacity of cable in cable.
2. two according to claim 1 parallel direct-burried cabling current-carrying method for determination of amount, it is characterised in that be based on
The stable state thermal circuit model of two parallel direct-burried cablings obtains a cable in described two parallel direct-burried cablings
The step of temperature rise that the temperature rise that is produced to another cable and every cable itself are produced, includes：
Two single No. 1 cables in two parallel direct-burried cablings, No. 2 cables are 10KV three-core cables, based on two
The stable state thermal circuit model of the parallel directly buried installation 10KV three-core cables of root passes through formula Q=3Qd2+3(1+λ12+λ22)Qc2Obtain No. 2 electricity
The total heat flow of cable transmission, wherein Q is No. 2 total heat flows of cable transmission, Qd2It is No. 2 cable insulations and insulation screen
Dielectric loss, λ12It is No. 2 loss factors of cable metallic screens floor, λ22It is No. 2 loss factors of cable sheath, Qc2It is No. 2
The loss that cable conductor and conductor shield are produced,I2It is the electric current that No. 2 cables pass through, R2It is No. 2 cable units
The resistance of length；
By formulaNo. 2 cables are obtained to produce No. 1 cable skin
Raw temperature rise, whereinIt is the temperature rise that No. 2 cables are produced to No. 1 cable skin, θ02It is No. 2 skin temperatures of cable, T is institute
State the Soil Thermal along cable unit length between No. 1 cable and No. 2 cables in two parallel directly buried installation 10KV three-core cables
Resistance；
By formulaQ=θ02-3(T+T12+T22+T32)[Qd2+(1+λ12+λ22)Qc2] obtain No. 2
The temperature rise that cable is produced to No. 1 cable conductor, whereinIt is the temperature rise that No. 2 cables are produced to No. 1 cable conductor, T12It is No. 2 electricity
The thermal resistance of cable insulating barrier, T22It is No. 2 cable filling floor and the thermal resistance of inner sheath, T32It is No. 2 thermal resistances of cable jacket；
By by formula θ '11-θ21=T11/3×(3Qc1+3Qd1/2)、θ21-θ31=T21×[3Qd1+3(1+λ11)Qc1]、θ31-θ01
=T31×[3Qd1+3(1+λ11+λ21)Qc1] three formulas are added and obtain the temperature rise that No. 1 cable itself is produced：θ’11=θ01+T11(Qc1+
Qd1/2)+3T21[Qc1(1+λ11)+Qd1]+3T31[Qc1(1+λ11+λ21)+Qd1], wherein θ '11For the temperature that No. 1 cable itself is produced
Rise, θ21It is No. 1 cable metallic screens floor temperature, T11It is No. 1 cable insulation thermal resistance, Qc1It is No. 1 cable conductor and conductor shielding
The loss that layer is produced, Qd1It is No. 1 cable insulation and the dielectric loss of insulation screen, θ31It is No. 1 cable sheath temperature,
T21It is No. 1 cable filling floor and inner sheath thermal resistance, λ11It is No. 1 loss factor of cable metallic screens floor, θ01It is No. 1 cable meter
Skin temperature, T31It is No. 1 cable jacket thermal resistance, λ21It is No. 1 loss factor of cable sheath,I1It is No. 1 electricity
The electric current that cable passes through, R1It is No. 1 resistance of cable unit length.
3. two according to claim 2 parallel direct-burried cabling current-carrying method for determination of amount, it is characterised in that according to
What a cable is produced to another cable in two parallel direct-burried cablings temperature rise and every cable itself were produced
The step of temperature rise obtains in two parallel direct-burried cablings the overall temperature rise of every cable includes：
Based on the temperature rise that No. 2 cables are produced to No. 1 cable conductorThe temperature rise θ ' produced with No. 1 cable itself11, root
No. 1 overall temperature rise of cable is obtained according to principle of stacking：
4. two according to claim 3 parallel direct-burried cabling current-carrying method for determination of amount, it is characterised in that utilize
The overall temperature rise of every cable is determined every in described two parallel direct-burried cablings in two parallel direct-burried cablings
The step of current-carrying capacity of cable, includes：
Using the overall temperature rise θ of No. 1 cable11By formulaIt is determined that
No. 1 current-carrying capacity of cable.
5. a kind of two determining devices of parallel direct-burried cabling current-carrying capacity, it is characterised in that including：
Model sets up unit, for utilizing thermal resistance Tr by the steady state thermal road of two unit cables in two parallel direct-burried cablings
Model is connected, and obtains the described two stable state thermal circuit models of parallel direct-burried cabling, and wherein thermal resistance Tr is described two parallel
The soil thermal resistance along cable unit length in directly buried installation cable between two unit cables；
Temperature rise acquiring unit, obtains described two and puts down for the stable state thermal circuit model based on described two parallel direct-burried cablings
The temperature rise that the temperature rise and every cable itself that a cable is produced to another cable in row directly buried installation cable are produced；
The temperature rise acquiring unit is additionally operable to according to a cable in described two parallel direct-burried cablings to another cable
The temperature rise that the temperature rise of generation and every cable itself are produced obtains in described two parallel direct-burried cablings the total of every cable
Temperature rise；
Current-carrying capacity determining unit, it is described for the overall temperature rise determination using every cable in described two parallel direct-burried cablings
The every current-carrying capacity of cable in two parallel direct-burried cablings.
6. two according to claim 5 determining devices of parallel direct-burried cabling current-carrying capacity, it is characterised in that described
Two single No. 1 cables in two parallel direct-burried cablings, No. 2 cables are 10KV three-core cables, and the temperature rise obtains single
Unit passes through formula Q=3Q based on two stable state thermal circuit models of parallel directly buried installation 10KV three-core cablesd2+3(1+λ12+λ22)Qc2
No. 2 total heat flows of cable transmission are obtained, wherein Q is No. 2 total heat flows of cable transmission, Qd2For No. 2 cable insulations and absolutely
The dielectric loss of edge screen layer, λ12It is No. 2 loss factors of cable metallic screens floor, λ22For No. 2 losses of cable sheath because
Element, Qc2It is the loss that No. 2 cable conductors and conductor shield are produced,I2It is the electric current that No. 2 cables pass through, R2It is 2
The resistance of number cable unit length；
By formulaNo. 2 cables are obtained to produce No. 1 cable skin
Raw temperature rise, whereinIt is the temperature rise that No. 2 cables are produced to No. 1 cable skin, θ02It is No. 2 skin temperatures of cable, T is institute
State the Soil Thermal along cable unit length between No. 1 cable and No. 2 cables in two parallel directly buried installation 10KV three-core cables
Resistance；
By formulaQ=θ02-3(T+T12+T22+T32)[Qd2+(1+λ12+λ22)Qc2] obtain No. 2
The temperature rise that cable is produced to No. 1 cable conductor, whereinIt is the temperature rise that No. 2 cables are produced to No. 1 cable conductor, T12It is No. 2 electricity
The thermal resistance of cable insulating barrier, T22It is No. 2 cable filling floor and the thermal resistance of inner sheath, T32It is No. 2 thermal resistances of cable jacket；
By by formula θ '11-θ21=T11/3×(3Qc1+3Qd1/2)、θ21-θ31=T21×[3Qd1+3(1+λ11)Qc1]、θ31-θ01
=T31×[3Qd1+3(1+λ11+λ21)Qc1] three formulas are added and obtain the temperature rise that No. 1 cable itself is produced：θ’11=θ01+T11(Qc1+
Qd1/2)+3T21[Qc1(1+λ11)+Qd1]+3T31[Qc1(1+λ11+λ21)+Qd1], wherein θ '11For the temperature that No. 1 cable itself is produced
Rise, θ21It is No. 1 cable metallic screens floor temperature, T11It is No. 1 cable insulation thermal resistance, Qc1It is No. 1 cable conductor and conductor shielding
The loss that layer is produced, Qd1It is No. 1 cable insulation and the dielectric loss of insulation screen, θ31It is No. 1 cable sheath temperature,
T21It is No. 1 cable filling floor and inner sheath thermal resistance, λ11It is No. 1 loss factor of cable metallic screens floor, θ01It is No. 1 cable meter
Skin temperature, T31It is No. 1 cable jacket thermal resistance, λ21It is No. 1 loss factor of cable sheath,I1It is No. 1 electricity
The electric current that cable passes through, R1It is No. 1 resistance of cable unit length.
7. two according to claim 6 determining devices of parallel direct-burried cabling current-carrying capacity, it is characterised in that described
Temperature rise acquiring unit is based on the temperature rise that No. 2 cables are produced to No. 1 cable conductorThe temperature produced with No. 1 cable itself
Rise θ '11, No. 1 overall temperature rise of cable is obtained according to principle of stacking：
8. two according to claim 7 determining devices of parallel direct-burried cabling current-carrying capacity, it is characterised in that the load
Flow determining unit utilizes the overall temperature rise θ of No. 1 cable11By formula
Determine No. 1 current-carrying capacity of cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410687390.4A CN104407247B (en) | 2014-11-24 | 2014-11-24 | Two determination method and apparatus of parallel direct-burried cabling current-carrying capacity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410687390.4A CN104407247B (en) | 2014-11-24 | 2014-11-24 | Two determination method and apparatus of parallel direct-burried cabling current-carrying capacity |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104407247A CN104407247A (en) | 2015-03-11 |
| CN104407247B true CN104407247B (en) | 2017-06-06 |
Family
ID=52644892
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410687390.4A Active CN104407247B (en) | 2014-11-24 | 2014-11-24 | Two determination method and apparatus of parallel direct-burried cabling current-carrying capacity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104407247B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104730388A (en) * | 2015-03-25 | 2015-06-24 | 广州供电局有限公司 | Method and device for evaluating influence of environment thermal resistance on three-core cable core temperature |
| CN110095696B (en) * | 2019-06-14 | 2021-04-23 | 广东电网有限责任公司 | Cable current-carrying capacity adjusting method, device, equipment and readable storage medium |
| CN113589065A (en) * | 2021-06-22 | 2021-11-02 | 中国电力科学研究院有限公司 | Method and device for testing current carrying capacity of directly-buried cable |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101672880A (en) * | 2009-09-21 | 2010-03-17 | 广东电网公司广州供电局 | Identification method of cable current-carrying capacity and identification device |
| CN102539964A (en) * | 2011-12-21 | 2012-07-04 | 武汉理工大学 | Method for judging insulation characteristics of cross linked polyethylene (XLPE) power cables on line |
| CN102590593A (en) * | 2012-03-07 | 2012-07-18 | 广东电网公司佛山供电局 | Steady state thermal circuit model-based method and device for determining permissible current of overhead conductor |
| CN103234659A (en) * | 2013-03-28 | 2013-08-07 | 华南理工大学 | Online temperature measuring method for overhead wire |
| CN103439609A (en) * | 2013-08-29 | 2013-12-11 | 华南理工大学 | Method for calculating power cable real-time emergency carrying capacity |
| 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 |
-
2014
- 2014-11-24 CN CN201410687390.4A patent/CN104407247B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101672880A (en) * | 2009-09-21 | 2010-03-17 | 广东电网公司广州供电局 | Identification method of cable current-carrying capacity and identification device |
| CN102539964A (en) * | 2011-12-21 | 2012-07-04 | 武汉理工大学 | Method for judging insulation characteristics of cross linked polyethylene (XLPE) power cables on line |
| CN102590593A (en) * | 2012-03-07 | 2012-07-18 | 广东电网公司佛山供电局 | Steady state thermal circuit model-based method and device for determining permissible current of overhead conductor |
| CN103234659A (en) * | 2013-03-28 | 2013-08-07 | 华南理工大学 | Online temperature measuring method for overhead wire |
| CN103439609A (en) * | 2013-08-29 | 2013-12-11 | 华南理工大学 | Method for calculating power cable real-time emergency carrying capacity |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104407247A (en) | 2015-03-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105510645B (en) | A kind of mode of connection of Integral three-phase power transformer automatic detection | |
| CN104407247B (en) | Two determination method and apparatus of parallel direct-burried cabling current-carrying capacity | |
| CN203150244U (en) | Aluminium alloy compacted conductor medium-voltage flame retardation fireproof cable | |
| CN202549405U (en) | Cable for high-temperature resistant computer | |
| Li et al. | Evaluation of high‐voltage AC cable grounding systems based on the real‐time monitoring and theoretical calculation of grounding currents | |
| CN202230789U (en) | Novel high-temperature resistant cable | |
| CN105205202B (en) | A kind of carrying current calculation method | |
| CN203480928U (en) | Intelligent conductor temperature-measurement high-voltage crosslinked cable | |
| CN102881358A (en) | Variable-frequency cable with aluminum alloy conductor | |
| CN203366776U (en) | Novel high temperature resistant control cable | |
| CN204066791U (en) | A kind of steel-aluminum wire flat cable | |
| CN202495281U (en) | Low skin effect extra-high voltage crosslinked cable | |
| Wang et al. | The electric energy loss in overhead ground wires of 110kV six-circuit transmission line on the same tower | |
| CN202905213U (en) | Aluminum alloy conductor variable-frequency cable | |
| CN203327270U (en) | Intelligent temperature self-regulating heat tracing cable for oil-gas pipeline | |
| CN203038684U (en) | Aluminium tube type cable used for conductor crosslinked polyethylene insulation winding | |
| CN202930124U (en) | Ratproof and anti-termite type coaxial cable for extra-high voltage electric line grounding | |
| CN202042276U (en) | Coaxial cable for cross interlinking grounding of ultrahigh-voltage cable circuit | |
| CN208298582U (en) | A kind of wind power plant presses lightning protection water conservancy diversion pre-branched cable in using | |
| CN202632838U (en) | Fluoroplastic insulation control cable | |
| CN201995150U (en) | Self-heating cable | |
| CN204315276U (en) | Heat radiating type cable | |
| CN201298724Y (en) | Crosslinked cable heat shrinkage type outdoor terminal | |
| CN2745193Y (en) | Flexible electromagnetic pulse resistant cable | |
| CN104299715A (en) | High-voltage transmission power cable high in strength and low in electrical resistivity |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20231214 Address after: 510620, No. two, No. 2, Tianhe South Road, Guangzhou, Guangdong, Tianhe District Patentee after: Guangzhou Power Supply Bureau of Guangdong Power Grid Co.,Ltd. Patentee after: SOUTH CHINA University OF TECHNOLOGY Address before: 510620, No. two, No. 2, Tianhe South Road, Guangzhou, Guangdong, Tianhe District Patentee before: GUANGZHOU POWER SUPPLY Co.,Ltd. Patentee before: SOUTH CHINA University OF TECHNOLOGY |