CN110222954A - The temperature analysis method and device of thermoelectricity factory director's vertical section isolated-phase enclosed bus - Google Patents
The temperature analysis method and device of thermoelectricity factory director's vertical section isolated-phase enclosed bus Download PDFInfo
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- CN110222954A CN110222954A CN201910419360.8A CN201910419360A CN110222954A CN 110222954 A CN110222954 A CN 110222954A CN 201910419360 A CN201910419360 A CN 201910419360A CN 110222954 A CN110222954 A CN 110222954A
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- G—PHYSICS
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- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
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- G06Q10/0639—Performance analysis of employees; Performance analysis of enterprise or organisation operations
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
Abstract
The embodiment of the present invention provides the temperature analysis method and device of a kind of thermoelectricity factory director vertical section isolated-phase enclosed bus, belongs to thermal power plant field of electromechanical technology.The temperature analysis method includes: the skin temperature and conductor temperature for calculating per unit length, and temperature rise curve and average running temperature based on the determining shell and conductor under assigned work electric current of all calculated results；Average running temperature based on shell and conductor carries out heat dissipation calculating to the enclosed busbar of per unit length；And the calculated result calculated based on temperature rise curve and heat dissipation, judge whether shell and conductor meet the temperature requirement to long vertical section isolated-phase enclosed bus along the temperature change and heat dissipation law of short transverse.The present invention program carries out temperature analysis to it, facilitates the structure size for selecting the enclosed busbar for meeting assigned temperature requirement and economical rationality before the installation of long vertical section isolated-phase enclosed bus.
Description
Technical field
The present invention relates to thermal power plant field of electromechanical technology, more particularly to a kind of thermoelectricity factory director vertical section from mutually closing
The temperature analysis method and device of bus.
Background technique
With the raising of the parameter request to Turbo-generator Set, the cost of matched high temperature steam pipeline system is got over
Come it is higher, investment proportion rise with it.In this regard, proposing in power plant project design by air-cooled steam turbine generator group cloth
The scheme for being placed in the top of bunker bay is imagined, i.e. steam turbine high position arrangement.The steam turbine high position arrangement not only can be with
High temperature steam pipeline length is substantially reduced, the cost of high temperature steam pipeline system is reduced, can also substantially reduce the length of exhaust pipe
Degree realizes the reduction of unit coal consumption to reduce the back pressure of unit, meanwhile, accordingly reduce the land area of steam turbine building.
But steam turbine high position cloth postpones, and can have an impact to electrical system, wherein most important influence is embodied in generator
In the arrangement of outlet isolated-phase enclosed bus, cause the vertical section distance of isolated-phase enclosed bus longer.And long vertical section is from mutually closing
Bus, since the bus height of each position is different, inside the housing and shell exterior can be respectively formed the convection current of air, so that
Different section temperature can be variant, and is influenced by the environment arranged, heat dissipation also can be very unfavorable.Therefore, it is different from level
Section isolated-phase enclosed bus, need to long vertical section isolated-phase enclosed bus carry out temperature analysis, with guarantee select long vertical section from
Phase enclosed busbar can satisfy industry technology regulation, to meet enclosed busbar safe operation, requirement convenient to overhaul.
But present inventor has found in the implementation of the present invention, long vertical section is from mutually closing in the prior art
Bus is all only applied to undergroundhydropower station, and the long vertical section isolated-phase enclosed bus arrangement in thermal power plant has with power station
Larger difference, such as thermoelectricity factory director's vertical section isolated-phase enclosed bus are arranged in wide atmospheric environment, and power station closing is female
Line is arranged in the enclosed environment in vertical shaft, tunnel, and heat dissipation will consider the influence of hoistway wall or tunnel wall.Therefore, for water power
The length that the temperature analysis for the long vertical section isolated-phase enclosed bus stood is not particularly suited in thermal power plant after high-order arrangement steam turbine is vertical
Section isolated-phase enclosed bus.
Summary of the invention
The purpose of the embodiment of the present invention is that providing a kind of temperature analysis method of thermoelectricity factory director vertical section isolated-phase enclosed bus
And device, at least being partially solved above-mentioned technical problem.
To achieve the goals above, the embodiment of the present invention provides a kind of temperature of thermoelectricity factory director vertical section isolated-phase enclosed bus
Analysis method, wherein the structural frames for each layer of steam turbine building that the long vertical section isolated-phase enclosed bus is postponed using steam turbine high position cloth
Frame is fixed, and the long vertical section isolated-phase enclosed bus includes shell and the conductor that is placed in the shell, and the temperature point
Analysis method includes:
By the long vertical section isolated-phase enclosed bus by being highly divided into several uniform unit lengths, and based on described outer
Shell and the corresponding equation of heat balance of the conductor calculate per unit by the sequence from bottom to up along bus short transverse
The skin temperature and conductor temperature of length, and the shell and the conductor are respectively formed in specified work based on all calculated results
Make under electric current corresponding temperature with the temperature rise curve of height change, and based on the temperature rise curve determine the long vertical section from
Running temperature that the shell of phase enclosed busbar is averaged running temperature and conductor is averaged；
Running temperature is averaged based on the shell and the conductor is averaged running temperature, to the length of per unit length
Vertical section isolated-phase enclosed bus carries out heat dissipation calculating, wherein it includes that the conductor dissipates the radiation of the shell that the heat dissipation, which calculates,
Heat calculates, the shell calculates the heat loss through radiation of surrounding space, the conductor calculates the Natural Heat Convection of the shell,
The heat Calculation that shell absorbs when the shell is to the Natural Heat Convection calculating of surrounding space and sunshine；And
Based on the temperature rise curve and the calculated result for radiating and calculating is carried out, judges the shell and the conductor two
To the long vertical section from mutually sealing when whether person meets steam turbine high position arrangement along the temperature change and heat dissipation law of short transverse
The temperature requirement of close nut line.
Optionally, the conductor includes: to calculate the conductor according to the following formula to the heat loss through radiation calculating of the shell
To the heat loss through radiation amount Q of the shellMF:
In formula, εnFor system radiation coefficient, DMFor the outer diameter of bus-bars conductor, tMIt is averaged running temperature for the conductor, tKFor
The shell is averaged running temperature.
Optionally, the shell includes: to calculate the shell according to the following formula to the heat loss through radiation calculating of surrounding space
To the heat loss through radiation amount Q of surrounding spaceKF:
In formula, φ is interphase RADIATION ANGLE COEFFICIENT, DKFor the outer diameter of bus shell, εKWFor outer surface of outer cover radiation coefficient,
tKIt is averaged running temperature for the shell, t0Environment temperature.
Optionally, it includes leading described in calculating according to the following formula that the conductor, which calculates the Natural Heat Convection of the shell,
Natural Heat Convection amount Q of the body to the shellMD:
In formula, λmFor heat transfer coefficient of the medium air under qualitative temperature, N'μFor modified Nu Saierte criterion numeral, δKFor
Bus shell thickness, DMFor the outer diameter of bus-bars conductor, tMIt is averaged running temperature for the conductor, tKIt is averagely run for the shell
Temperature.
Optionally, it includes being calculated outside described according to the following formula that the shell, which calculates the Natural Heat Convection of surrounding space,
Natural Heat Convection amount Q of the shell to surrounding spaceKD:
QKD=π × α × DK×(tK-t0)
In formula, α is coefficient of heat transfer of the shell to surrounding space, DKFor the outer diameter of bus shell, t0For environment temperature, tKFor
The shell is averaged running temperature.
Optionally, the heat Calculation that the shell absorbs when sunshine includes shell when calculating sunshine according to the following formula
The heat Q of absorptionS:
QS=αS×DK×qS
In formula, αSFor the absorption coefficient of case surface, DKFor the outer diameter of bus shell, qSFor intensity of sunshine.
Optionally, the temperature analysis method further include: in both the shell and the conductor along the temperature of short transverse
After degree variation and heat dissipation law meet the temperature requirement, the long vertical section of installation to cooperation steam turbine high position arrangement
Isolated-phase enclosed bus carries out temperature monitoring, and the mode for carrying out temperature monitoring includes: in the long vertical section isolated-phase enclosed bus
Multiple temperature measuring points are set to carry out multi-point temperature measurement, or along the long vertical section isolated-phase enclosed bus length direction in its case surface
Optical fiber is pasted to carry out continuous temperature measurement.
Through the above technical solutions, the temperature analysis method of the embodiment of the present invention for thermal power plant long vertical section from mutually sealing
Close nut line carries out temperature analysis to it, helps to select and meet bus temperature as defined in industry before enclosed busbar installation
It is required that and the enclosed busbar of economical rationality structure size, to meet the safe operation and requirement convenient to overhaul of enclosed busbar.
On the other hand, the embodiment of the invention also provides a kind of temperature analysis of thermoelectricity factory director vertical section isolated-phase enclosed bus
Device, wherein the structural framing for each layer of steam turbine building that the long vertical section isolated-phase enclosed bus is postponed using steam turbine high position cloth is consolidated
It is fixed, and the long vertical section isolated-phase enclosed bus includes shell and the conductor that is placed in the shell, and the temperature analysis fills
It sets and includes:
Temperature computation module, for by the long vertical section isolated-phase enclosed bus by being highly divided into several uniform units
Length, and be based on the shell and the corresponding equation of heat balance of the conductor, by along bus short transverse from bottom to up
Sequence calculate the skin temperature and conductor temperature of per unit length, and be respectively formed the shell based on all calculated results
Temperature corresponding under assigned work electric current and is based on the temperature rise curve with the temperature rise curve of height change with the conductor
Determine that the shell of the long vertical section isolated-phase enclosed bus is averaged running temperature and conductor is averaged running temperature；
Radiate computing module, for being averaged running temperature based on the shell and the conductor is averaged running temperature, to every
The long vertical section isolated-phase enclosed bus of one unit length carries out heat dissipation calculating, wherein it includes the conductor that the heat dissipation, which calculates,
The heat loss through radiation of the shell is calculated, the shell calculates the heat loss through radiation of surrounding space, the conductor is to the shell
Natural Heat Convection calculate, the heat that shell absorbs when the shell calculates the Natural Heat Convection of surrounding space and sunshine
Amount calculates；And
Judgment module, the calculated result for being calculated based on the temperature rise curve and the progress heat dissipation, is judged described outer
To described when whether both shell and the conductor meet steam turbine high position arrangement along the temperature change and heat dissipation law of short transverse
The temperature requirement of long vertical section isolated-phase enclosed bus.
Optionally, the heat dissipation computing module includes:
First computing module, for calculating the conductor according to the following formula to the heat loss through radiation amount Q of the shellMF:
In formula, εnFor system radiation coefficient, DMFor the outer diameter of bus-bars conductor, tMIt is averaged running temperature for the conductor, tKFor
The shell is averaged running temperature；
Second computing module, for calculating the shell according to the following formula to the heat loss through radiation amount Q of surrounding spaceKF:
In formula, φ is interphase RADIATION ANGLE COEFFICIENT, DKFor the outer diameter of bus shell, εKWFor outer surface of outer cover radiation coefficient,
t0Environment temperature；
Third computing module, for calculating the conductor according to the following formula to the Natural Heat Convection amount of the shell
QMD:
In formula, λmFor heat transfer coefficient of the medium air under qualitative temperature, N'μFor modified Nu Saierte criterion numeral, δKFor
Bus shell thickness；
4th computing module, for calculating the shell according to the following formula to the Natural Heat Convection amount of surrounding space
QKD:
QKD=π × α × DK×(tK-t0)
In formula, α is coefficient of heat transfer of the shell to surrounding space；
5th computing module, the heat Q that the shell absorbs when for calculating sunshine according to the following formulaS:
QS=αS×DK×qS
In formula, αSFor the absorption coefficient of case surface, qSFor intensity of sunshine.
Optionally, the temperature analysis apparatus further include:
Temperature monitoring module, for being advised in both the shell and the conductor along the temperature change of short transverse and heat dissipation
Rule meet the temperature requirement after, to cooperation a steam turbine high position arrangement and install the long vertical section isolated-phase enclosed bus into
Trip temperature monitoring, and the mode for carrying out temperature monitoring includes: that multiple temperature measuring points are arranged in the long vertical section isolated-phase enclosed bus
To carry out multi-point temperature measurement, or along the long vertical section isolated-phase enclosed bus length direction optical fiber is pasted to carry out in its case surface
Continuous temperature measurement.
Possessed advantage is identical compared with the existing technology with above-mentioned temperature analysis method for the temperature analysis apparatus, herein
It repeats no more.
The other feature and advantage of the embodiment of the present invention will the following detailed description will be given in the detailed implementation section.
Detailed description of the invention
Attached drawing is to further understand for providing to the embodiment of the present invention, and constitute part of specification, under
The specific embodiment in face is used to explain the present invention embodiment together, but does not constitute the limitation to the embodiment of the present invention.Attached
In figure:
Fig. 1 is the process signal of the temperature analysis method of thermoelectricity factory director's vertical section isolated-phase enclosed bus of the embodiment of the present invention
Figure；
Fig. 2 (a) and Fig. 2 (b) is that example bus in operating current is 2400A and 3000A institute in the embodiment of the present invention respectively
Corresponding temperature rise curve figure；
Fig. 3 be in the embodiment of the present invention example bus operating current be 21170A corresponding to temperature rise curve figure；And
Fig. 4 is a kind of structure of the temperature analysis apparatus of thermoelectricity factory director vertical section isolated-phase enclosed bus of the embodiment of the present invention
Schematic diagram.
Description of symbols
410 temperature computation modules 420 heat dissipation computing module
430 judgment module, 440 temperature monitoring module
421 first computing module, 422 second computing module
The 4th computing module of 423 third computing module 424
425 the 5th computing modules
Specific embodiment
It is described in detail below in conjunction with specific embodiment of the attached drawing to the embodiment of the present invention.It should be understood that this
Locate described specific embodiment and be merely to illustrate and explain the present invention embodiment, is not intended to restrict the invention embodiment.
Fig. 1 is the process signal of the temperature analysis method of thermoelectricity factory director's vertical section isolated-phase enclosed bus of the embodiment of the present invention
Figure, wherein the structural framing for each layer of steam turbine building that the isolated-phase enclosed bus is postponed using steam turbine high position cloth is fixed.Wherein, should
Structural framing can be the workshop braced frame for being used to support the phaseisolated bus and being set on ground, the workshop support
Frame includes the edge exclusive wall vertical beam of longitudinal direction spaced one and row's inner vertical beam respectively, and exterior wall described in a row is perpendicular
Inner vertical beam described in straight beam and a row is arranged along the transverse direction interval vertical with longitudinal direction, the workshop braced frame
It is provided with Steam Turbine firing floor, the power generation positioned at inner vertical back portion is provided on the Steam Turbine firing floor
Machine.The phaseisolated bus may include sequentially connected first arrangement section, the second arrangement section and third arrangement section, first cloth
It sets section to be connected to the generator and extend to the exterior wall vertical beam, it is described outer that the second arrangement section is supported on one of them
Vertically extend on wall vertical beam and towards ground, the third arranges section from the workshop support frame structure towards exterior flat
Row extends in ground.Wherein, long vertical section phaseisolated bus is mainly the first arrangement section and the second arrangement section, and third arranges Duan Weishui
Flat section phaseisolated bus.
Further, for phaseisolated bus and its each arrangement section, all including shell and the conductor being placed in the shell.
As shown in Figure 1, the temperature analysis method may comprise steps of:
Step S100 calculates the skin temperature and conductor temperature of the enclosed busbar of per unit length, and based on all
The temperature rise curve that result is formed in the shell and the conductor under assigned work electric current is calculated, and true based on the temperature rise curve
Running temperature that the shell of the fixed long vertical section isolated-phase enclosed bus is averaged running temperature and conductor is averaged.
Specifically, by the long vertical section isolated-phase enclosed bus by being highly divided into several uniform unit lengths, and base
In the shell and the corresponding equation of heat balance of the conductor, calculated by the sequence from bottom to up along bus short transverse
The skin temperature and conductor temperature of per unit length, and it is based on all calculated results (institute corresponding to i.e. all unit lengths
State skin temperature and the conductor temperature) it is respectively formed the shell and the conductor temperature corresponding under assigned work electric current
The temperature rise curve with height change is spent, and determines that the shell of the long vertical section isolated-phase enclosed bus is flat based on the temperature rise curve
Equal running temperature and conductor are averaged running temperature.
Wherein, the temperature rise curve refers to shell and conductor temperature with the temperature variation curve of height change, by described
Temperature rise curve, it is convenient to determine that the shell is averaged running temperature and the conductor is averaged running temperature.
Wherein, equation of heat balance involved in the embodiment of the present invention mainly may include following part:
1) when conductor is in thermal steady state, the loss calorific value W of every phase unit lengthMWith heat loss through radiation amount QMFWith
Heat loss through convection amount QMDIt is transmitted to shell, three should meet the first equation of heat balance:
WM=QMF+QMD
Thermal losses calorific value W of the shell in addition to itselfKOutside, the heat W that conductor transmits also is receivedM.These heats should be distinguished
With heat loss through radiation amount QKFWith heat loss through convection amount QKDIt is transmitted to ambient enviroment.
If 2) disregard the influence of sunshine in thermostabilization, the heat dissipation capacity of every phase unit length shell and its calorific value and lead
Body calorific value should meet the second equation of heat balance:
WK+WM=QKF+QKD
If 3) consider the influence of sunshine in thermostabilization, the heat dissipation capacity of every phase unit length shell and its calorific value and lead
Body calorific value should meet third equation of heat balance:
WK+WM=QKF+QKD-QS
Wherein, QsThe heat that shell absorbs when for sunshine.
The example of the skin temperature and conductor temperature that calculate per unit length is given below.Because bus temperature variation is
Continuously, the empirically temperature variation very little (for example, rate of temperature change be less than 0.1K/m) of bus 1m, for isolated-phase buses
Vertical section is uniformly divided into Unit 50, per unit length 1m in this example by temperature distributing rule, and i-th cell is expressed as
IPBi, H (i, 1) indicate the vertical section height from bottom to i-th cell, and tKi, tMi can be respectively designated as i-th cell shell temperature
Degree, tK (i, 1), tM (i, 1) are respectively H (i, 1) section skin temperature.It can determine that H (i, 1) section shell is female according to equation of heat balance
Line, conductor temperature tK (i, 1), tM (i, 1).Then adding unit i+1, outside the bus for calculating separately out H (i+1,1) vertical section
Shell, conductor temperature tK (i+1,1), tM (i+1,1).Then the shell of unit i+1, conductor temperature tK (i+1)=(i+1) tK (i+1,
1)-i tK (i, 1), tM (i+1)=(i+1) tM (i+1,1)-i tM (i, 1).In the example, it is calculating in operating current
When 2400A and 3000A the temperature of bus shell (having a size of φ 1450 × 11) and conductor (size φ 900 × 16) with height temperature
Rising curve, such as Fig. 2 (a) and Fig. 2 (b) is shown respectively.
Step S200, is averaged running temperature based on the shell and the conductor is averaged running temperature, long to per unit
The long vertical section isolated-phase enclosed bus of degree carries out heat dissipation calculating.
Wherein, the demand substitution that can be calculated according to heat dissipation calculates the shell obtained from step S100 and averagely runs temperature
Degree and the conductor are averaged running temperature.
Each section of the radiation typically, for horizontally disposed isolated-phase enclosed bus, on bus axial length direction
Heat dissipation law and convection current rule are identical, therefore each section of temperature is identical.Also, horizontally disposed enclosed busbar
Shell can regard horizontal cylinder as, and free convection is well-regulated laminar flow；Bus is the confined space to the Natural Heat Convection of shell
Annular gap heat transfer free convection, this HEAT TRANSFER LAW had ripe experience.But for long vertical section from mutually closing
Bus, shell can regard perpendicular cylinder as, and conductor regards large ratio of height to width as to shell and erects annulus interlayer, and free convection is more complicated,
For the free convection close to the perpendicular wall of heat, the lower part of bus, free convection is just initially formed, and flowing is well-regulated laminar flow,
Become turbulent flow on the top of bus.It is thus impossible to using the temperature analysis and heat dissipation that are directed to horizontally disposed isolated-phase enclosed bus
It calculates and to carry out long vertical section isolated-phase enclosed bus temperature analysis and heat dissipation calculating.
In addition, the long vertical section isolated-phase enclosed bus of the embodiment of the present invention is arranged in wide atmospheric environment, without examining
Consider the influence of hole wall, such as postponed in steam turbine high position cloth, the long vertical section isolated-phase enclosed bus utilizes steam turbine high position cloth
The structural framing of each layer of the steam turbine building postponed is fixed, and every layer of space is larger, more utilizes heat dissipation relative to tunnel or vertical shaft,
But when calculating bus heat dispersal situations, need to consider highest environment temperature and the air circulation situation etc. in each layer structural framing.
Therefore combine background technology part it is found that with the long vertical section isolated-phase enclosed bus in power station heat dissipation calculate compared with, thermal power plant
It is significantly different to carry out the heat dissipation calculating environmental factor to be considered.
Accordingly, the heat dissipation calculating in the embodiment of the present invention for thermoelectricity factory director vertical section isolated-phase enclosed bus can wrap
Include that the conductor calculates the heat loss through radiation of the shell, the shell calculates the heat loss through radiation of surrounding space, the conductor
The Natural Heat Convection of the shell is calculated, the shell calculates the Natural Heat Convection of surrounding space and when sunshine outside
The heat Calculation that shell absorbs.
In a preferred embodiment, it includes calculating according to the following formula that the conductor, which calculates the heat loss through radiation of the shell,
Heat loss through radiation amount Q of the conductor to the shellMF(unit W/m, and be all W/m below in relation to the unit of heat):
In formula, εnFor system radiation coefficient, DMFor outer diameter (the unit m, and below in relation to outer diameter, thickness etc. of bus-bars conductor
The unit of size relevant parameter is all m) tMBeing averaged for the conductor, (unit is DEG C running temperature, and below in relation to the ginseng of temperature
Several units is all DEG C), tKIt is averaged running temperature for the shell.
In a preferred embodiment, it includes calculating according to the following formula that the shell, which calculates the heat loss through radiation of surrounding space,
Heat loss through radiation amount Q of the shell to surrounding spaceKF:
In formula, φ is interphase RADIATION ANGLE COEFFICIENT, DKFor the outer diameter of bus shell, εKWFor outer surface of outer cover radiation coefficient
(grey), tKIt is averaged running temperature for the shell, t0Environment temperature.
In a preferred embodiment, it includes according to the following formula that the conductor, which calculates the Natural Heat Convection of the shell,
The conductor is calculated to the Natural Heat Convection amount Q of the shellMD:
In formula, λmThe heat transfer coefficient (unit is W/m DEG C) for being medium air under qualitative temperature, the qualitative temperature is for example
For tm1, N'μFor modified Nu Saierte (Nusselt) criterion numeral, δKFor bus shell thickness, DMFor the outer diameter of bus-bars conductor, tM
It is averaged running temperature for the conductor, tKIt is averaged running temperature for the shell.
For horizontally disposed enclosed busbar, widely used N' in engineeringμCorrelation is as follows:
N'μ=0.4 × (Gr×Pr)0.2
In formula, GrFor Grashof number, PrFor Prandtl (Prantl) criterion numeral
And for the long vertical section enclosed busbar of the embodiment of the present invention, the N' that usesμCorrelation can be such that
Laminar flow section:
Turbulent section:
In formula, δ is interlayer air thickness, and H is vertical section bus height, GrCalculating formula is as follows:
In formula: β is the coefficient of cubical expansion of air, β=1/ (273+tm), g is acceleration of gravity, g=9.81, δmIt is fixed
Property size, be interlayer air thickness, i.e. δm=(DK-2δK-DM)/2, v is air kinetic viscosity (unit m2/s)
In a preferred embodiment, it includes according to the following formula that the shell, which calculates the Natural Heat Convection of surrounding space,
The shell is calculated to the Natural Heat Convection amount Q of surrounding spaceKD:
QKD=π × α × DK×(tK-t0)
In formula, α is that (unit is (W/m to coefficient of heat transfer of the shell to surrounding space2DEG C)), and
α=Nμ×λm/Lm
In formula, LmFor characteristic dimension, vertical section takes bus height, and horizontal segment takes bus outer diameter, NμFor Nu Saierte
(Nusselt) criterion numeral.
For horizontally disposed enclosed busbar, widely used N in engineeringμCorrelation is as follows:
Nμ=0.36+0.384 × (Gr×Pr)1/6+0.102×(Gr×Pr)1/3
And for the long vertical section enclosed busbar of the embodiment of the present invention, the N' that usesμCorrelation can be such that
Laminar flow section: Nμ=0.59 × (Gr×Pr)0.25
Turbulent section: Nμ=0.11 × (Gr×Pr)1/3
GrCalculating formula:
In formula, δmFor qualitative size, horizontal segment is the outer diameter D of shellK, vertical section is bus height H.
Wherein, but since the shell of horizontal segment and vertical section is variant to ambient enviroment heat loss through convection, the air of horizontal segment
Convection current is in laminar condition, and the cross-ventilation of vertical section is substantially at turbulence state, the Nu Saierte standard of horizontal segment and vertical section
Then count NμCalculation formula in coefficient C and index n it is variant, cause shell and conductor running temperature different.But consider vertical section
Than horizontal segment Temperature Distribution compared with inhomogeneities, the calculating running temperature of vertical section calculating running temperature and horizontal segment is preferably made to be close
(slightly below less than 1 DEG C) or 1 DEG C~2 DEG C of running temperature are calculated lower than horizontal segment.
In a preferred embodiment, the heat Calculation that the shell absorbs when sunshine includes calculating sunshine according to the following formula
The heat Q that Shi Suoshu shell absorbsS:
QS=αS×DK×qS
In formula, αSFor the absorption coefficient of case surface, general value is equal with radiation coefficient, DKFor the outer diameter of bus shell,
qSFor intensity of sunshine, q is takenS=1000W/m2。
Step S300, based on the temperature rise curve and carry out it is described heat dissipation calculate calculated result, judge the shell and
Both described conductors hang down to the length when whether meeting steam turbine high position arrangement along the temperature change and heat dissipation law of short transverse
The temperature requirement of straight section isolated-phase enclosed bus.
For isolated-phase enclosed bus, when its conductor is powered, will generate that one contrary on shell and its numerical value almost
The induced current equal with the electric current flowed through on bus-bars conductor, since the conductor and shell of aluminum are there are resistance, bus passes through electricity
Loss will be produced electricl energy when stream and causes to generate heat, while the heat that bus generates passes to week by radiation and Natural Heat Convection
Collarette border finally reaches thermal balance in some temperature, as long as equilibrium temperature meets prescribed requirement, isolated-phase enclosed bus operation
It is exactly safe.Currently, the temperature requirement at each position of the metal-enclosed bus of national standard defined is as shown in table 1:
Table 1
In addition, carrying out Temperature Rise Analysis and when heat dissipation calculates, error and temperature distribution is non-uniform property are considered, suitably there are one
Fixed nargin, and there are stack effects it is also contemplated that whether calculated heat dissipation law can make vertical section.
Since the high-order cloth of steam turbine postpones, the big appointment of the long vertical section of isolated-phase enclosed bus is up to 50m, therefore it is installed
Can be complex, to strive for disposably being installed in place.In this way, if just finding the structure of long vertical section isolated-phase enclosed bus after installation
Size does not meet temperature requirement, can bring greater impact to entire high-order arrangement engineering.Therefore, the temperature of the embodiment of the present invention
Steam turbine high position cloth is postponed and is corresponded to the long vertical section isolated-phase enclosed bus of arrangement for thermal power plant by analysis method, in the closing
Before bus installation, temperature analysis is carried out to it, helps to select the enclosed busbar for meeting assigned temperature requirement and economical rationality
Structure size, guarantee the operational safety of enclosed busbar, improve the stability that steam turbine high position cloth postpones each component.
Table 2 is the structure size of example enclosed busbar, in this example, selects most in three kinds of dimension plans of table 2 in need
Size as thermoelectricity factory director's vertical section isolated-phase enclosed bus.
Corresponding table 2, in this example, long vertical section isolated-phase enclosed bus technical parameter is as follows:
(1) voltage rating: 24kV
(2) rated current: 25000A
(3) type of cooling: natural cooling
(4) KA Rms: 160kA (2s)
(5) peak value is resistant to electric current: 400kA
(6) 1min power frequency withstanding voltage: 68kV
(7) lightning impulse withstand voltage: 125kV
The enclosed busbar horizontal section length about 150m required in this example, vertical segment length about 50m are passed through according to previous engineering
It tests and above-mentioned technical parameter, enclosed busbar conductor (900 × 15mm of φ) running temperature of 660MW unit conventional levels arrangement does not surpass
80 DEG C are crossed, shell (1450 × 10mm of φ) running temperature is no more than 64 DEG C.It can be seen that the selection of horizontal segment enclosed busbar is led in this example
Body is 900 × 15mm of φ, shell be 1450 × 10mm of φ be it is feasible, for investment reduction, this special topic does not consider because vertical
Section enclosed busbar may be increased in size and horizontal segment the case where being also increased in size, therefore, following in this example not consider further that in table 2
Scheme 3.
Using the temperature analysis method of the embodiment of the present invention, in the example, when operating current is 21170A, bus shell
The temperature of (φ 1450 × 11) and conductor (φ 900 × 16) (i.e. scheme 2) is with the temperature rise curve of the variation of height substantially such as Fig. 3 institute
Show.
With reference to Fig. 2 (a), Fig. 2 (b) and Fig. 3, the temperature of shell is the increase in bottom with height and is gradually increasing, and is arrived
After having reached certain altitude, the temperature of shell remains unchanged substantially；Temperature rise of conductor curve approximation in centre than more gentle spindle,
The temperature of conductor is the variation with its height and changes, but be not the temperature of highest point is highest, and temperature is in bottom
It is gradually increasing with the increase of height, after reaching certain altitude, then as the increase of height is gradually reduced, but changes not
Greatly, it is no more than 2 DEG C~5 DEG C.Therefore, the long vertical section isolated-phase enclosed bus skin temperature of height 50m is substantially uniform in this example
Distribution, conductor temperature is then in gentle spindle arrangement along short transverse, but range of temperature is no more than 2 DEG C~5 DEG C, meets
Specified temperature increase requirement, so that geometric dimension involved in scheme 2 in table 2 is reasonable in Technological Economy.
Further, the heat dissipation carried out to the geometric dimension of scheme 2 in the temperature analysis method of the embodiment of the present invention calculates,
It can be obtained to draw a conclusion:
1) heat loss through radiation accounts for 85% or so of its total heat dissipation capacity, and heat loss through convection only the total heat dissipation capacity of Zhan 15% or so, it is right
The accuracy of flow heat dissipation influences less conductor overall heat balance, and the air themperature inside bus is approximate in bus vertical direction
It is evenly distributed, meets specified temperature requirement.
2) bus shell is large space heat transfer free convection to the free convection of peripheral space, due to the air close to shell
Thin layer is heated and rises, and in the lower part of shell, boundary layer of air is initially laminar condition, followed by transition state, is finally developed
To turbulent condition, from bottom to top, the coefficient of heat transfer is gradually reduced shell, and by transition region, the coefficient of heat transfer starts to increase, until turbulent flow
Area's coefficient of heat transfer tends to constant, and surface film thermal conductance is unrelated with characteristic length (i.e. bus height) when free convection turbulent flow
Constant.
3) natural convection air that air between vertical enclosed busbar conductor and shell is the confined space, heat convection system are grown
Number is related to depth-width ratio (the H/ δ) of the air gap, but its natural convection air is faint, and heat dissipation depends mainly on heat loss through radiation, right
The accuracy of flow heat dissipation influences conductor overall heat balance little.
4) by heat dissipation law, significant " stack effect " is not present in vertical section.
By above-mentioned 4 points, the heat dissipation law of bus corresponding to the geometric dimension of scheme 2 meets specified temperature requirement.
Accordingly, by temperature rise calculating and heat dissipation calculating, it is found that horizontal segment, vertical section conductor and shell are averaged, running temperature is small
Allow temperature in professional standard, i.e., conductor, which is less than, allows 90 DEG C of temperature, and shell is less than 70 DEG C, and horizontal segment and vertical section are averagely transported
Trip temperature difference is little, it is contemplated that temperature distribution is non-uniform along short transverse for vertical section, the choosing of isolated-phase enclosed bus structure size
The scheme 2 selected in table 2 is suitable.
In more preferred embodiment, it is contemplated that after selected isolated-phase enclosed bus size, cooperation steam turbine high position arrangement
And the long vertical section isolated-phase enclosed bus installed has temperature distributing rule that may influence and change with environment, therefore
In the preferred embodiment, the temperature analysis method can also include: in both the shell and the conductor along height side
To temperature change and heat dissipation law meet the temperature requirement after, to cooperation a steam turbine high position arrangement and install the length
Vertical section isolated-phase enclosed bus carries out temperature monitoring.
Currently, the isolated-phase enclosed bus of domestic conventional levels arrangement generallys use online or portable infrared temperature detection,
Being generally used for conductor majority of splice position, (temperature of (such as bus and generator, transformer junction) measures, and belongs to a survey
Amount, the substantially uniform distribution of conventional levels section bus temperature, therefore, the point thermometric at this majority of splice position can be met the requirements.
But current thermal power plant does not apply too long vertical section isolated-phase enclosed bus, for the sake of prudent, and also to can more preferably verify
The correctness of analysis more than ground is calculated, carries out the mode packet of temperature monitoring in the embodiment of the present invention to vertical section isolated-phase enclosed bus
It includes: 1) multiple temperature measuring points being set in the long vertical section isolated-phase enclosed bus to carry out multi-point temperature measurement or 2) vertical along the length
Section isolated-phase enclosed bus length direction pastes optical fiber in its case surface to carry out continuous temperature measurement.
Wherein, 1) plant scheme for the, such as be respectively arranged at 1 point in the junction of vertical section and upper and lower horizontal segment, it is intermediate
2) even 3 points of setting plants scheme for the, by intelligent acess optical transmitter and receiver, so that it may effectively measure the temperature of vertical enclosed busbar
Distribution.
Fig. 4 is a kind of structure of the temperature analysis apparatus of thermoelectricity factory director vertical section isolated-phase enclosed bus of the embodiment of the present invention
The temperature analysis method of schematic diagram, the temperature analysis apparatus and above-described embodiment is based on same invention thinking.As shown in figure 4, institute
Stating temperature analysis apparatus may include:
Temperature computation module 410, for by the long vertical section isolated-phase enclosed bus by be highly divided into it is uniform several
Unit length, and be based on the shell and the corresponding equation of heat balance of the conductor, by along bus short transverse under
Supreme sequence calculates the skin temperature and conductor temperature of per unit length, and is respectively formed based on all calculated results described
Shell and the conductor temperature corresponding under assigned work electric current and are based on the temperature rise with the temperature rise curve of height change
Curve determines that the shell of the long vertical section isolated-phase enclosed bus is averaged running temperature and conductor is averaged running temperature.
Radiate computing module 420, right for being averaged running temperature based on the shell and the conductor is averaged running temperature
The long vertical section isolated-phase enclosed bus of per unit length carries out heat dissipation calculating, wherein it includes described lead that the heat dissipation, which calculates,
Body calculates the heat loss through radiation of the shell, the shell calculates the heat loss through radiation of surrounding space, the conductor is to described outer
Shell absorbs when the Natural Heat Convection of shell calculates, the shell calculates the Natural Heat Convection of surrounding space and sunshine
Heat Calculation.
Judgment module 430, for based on the temperature rise curve and carrying out the calculated result that the heat dissipation calculates, described in judgement
To institute when whether both shell and the conductor meet steam turbine high position arrangement along the temperature change and heat dissipation law of short transverse
State the temperature requirement of long vertical section isolated-phase enclosed bus.
With continued reference to Fig. 4, in a preferred embodiment, the heat dissipation computing module 420 may include:
First computing module 421, for calculating the conductor according to the following formula to the heat loss through radiation amount Q of the shellMF:
In formula, εnFor system radiation coefficient, DMFor the outer diameter of bus-bars conductor, tMIt is averaged running temperature for the conductor, tKFor
The shell is averaged running temperature；
Second computing module 422, for calculating the shell according to the following formula to the heat loss through radiation amount Q of surrounding spaceKF:
In formula, φ is interphase RADIATION ANGLE COEFFICIENT, DKFor the outer diameter of bus shell, εKWFor outer surface of outer cover radiation coefficient,
t0Environment temperature；
Third computing module 423, for calculating the conductor according to the following formula to the Natural Heat Convection of the shell
Measure QMD:
In formula, λmFor heat transfer coefficient of the medium air under qualitative temperature, N'μFor modified Nu Saierte criterion numeral, δKFor
Bus shell thickness；
4th computing module 424, for calculating the shell according to the following formula to the Natural Heat Convection of surrounding space
Measure QKD:
QKD=π × α × DK×(tK-t0)
In formula, α is coefficient of heat transfer of the shell to surrounding space；
5th computing module 425, the heat Q that the shell absorbs when for calculating sunshine according to the following formulaS:
QS=αS×DK×qS
In formula, αSFor the absorption coefficient of case surface, qSFor intensity of sunshine.
In more preferred embodiment, the temperature analysis apparatus can also include: temperature monitoring module 440, be used for
It is right after both the shell and the conductor meet the temperature requirement along the temperature change and heat dissipation law of short transverse
The long vertical section isolated-phase enclosed bus for cooperating steam turbine high position arrangement and installing carries out temperature monitoring.Wherein, temperature is carried out
The mode of monitoring may include: in the multiple temperature measuring points of the long vertical section isolated-phase enclosed bus setting to carry out multi-point temperature measurement, or
Optical fiber is pasted to carry out continuous temperature measurement in its case surface along the long vertical section isolated-phase enclosed bus length direction.
It should be noted that the specific implementation details and effect of the temperature analysis apparatus of the present embodiment can refer to it is above-mentioned about temperature
The embodiment of analysis method is spent, details are not described herein.
The optional embodiment of the embodiment of the present invention is described in detail in conjunction with attached drawing above, still, the embodiment of the present invention is simultaneously
The detail being not limited in above embodiment can be to of the invention real in the range of the technology design of the embodiment of the present invention
The technical solution for applying example carries out a variety of simple variants, these simple variants belong to the protection scope of the embodiment of the present invention.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case where shield, it can be combined in any appropriate way.In order to avoid unnecessary repetition, the embodiment of the present invention pair
No further explanation will be given for various combinations of possible ways.
It will be appreciated by those skilled in the art that implementing the method for the above embodiments is that can pass through
Program is completed to instruct relevant hardware, which is stored in a storage medium, including some instructions are used so that single
Piece machine, chip or processor (processor) execute all or part of the steps of each embodiment the method for the application.And it is preceding
The storage medium stated includes: USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory
The various media that can store program code such as (RAM, Random Access Memory), magnetic or disk.
In addition, any combination can also be carried out between a variety of different embodiments of the embodiment of the present invention, as long as it is not
The thought of the embodiment of the present invention is violated, equally should be considered as disclosure of that of the embodiment of the present invention.
Claims (10)
1. a kind of temperature analysis method of thermoelectricity factory director vertical section isolated-phase enclosed bus, which is characterized in that the long vertical section from
The structural framing for each layer of steam turbine building that phase enclosed busbar is postponed using steam turbine high position cloth is fixed, and the long vertical section is from mutually sealing
Close nut line includes shell and the conductor that is placed in the shell, and the temperature analysis method includes:
By the long vertical section isolated-phase enclosed bus by being highly divided into several uniform unit lengths, and based on the shell and
The corresponding equation of heat balance of the conductor calculates per unit length by the sequence from bottom to up along bus short transverse
Skin temperature and conductor temperature, and based on all calculated results be respectively formed the shell and the conductor assigned work electricity
Corresponding temperature is flowed down with the temperature rise curve of height change, and determines the long vertical section from mutually sealing based on the temperature rise curve
Running temperature that the shell of close nut line is averaged running temperature and conductor is averaged；
Running temperature is averaged based on the shell and the conductor is averaged running temperature, it is vertical to the length of per unit length
Section isolated-phase enclosed bus carries out heat dissipation calculating, wherein the heat dissipation calculates the heat loss through radiation meter for including the conductor to the shell
It calculates, the shell calculates the heat loss through radiation of surrounding space, the conductor calculates the Natural Heat Convection of the shell, is described
The heat Calculation that shell absorbs when shell is to the Natural Heat Convection calculating of surrounding space and sunshine；And
Based on the temperature rise curve and the calculated result for radiating and calculating is carried out, judges both the shell and the conductor edge
Whether the temperature change and heat dissipation law of short transverse meet female from mutually closing to the long vertical section when steam turbine high position arrangement
The temperature requirement of line.
2. temperature analysis method according to claim 1, which is characterized in that heat loss through radiation of the conductor to the shell
Calculating includes:
The conductor is calculated according to the following formula to the heat loss through radiation amount Q of the shellMF:
In formula, εnFor system radiation coefficient, DMFor the outer diameter of bus-bars conductor, tMIt is averaged running temperature for the conductor, tKIt is described
Shell is averaged running temperature.
3. temperature analysis method according to claim 1, which is characterized in that heat loss through radiation of the shell to surrounding space
Calculating includes:
The shell is calculated according to the following formula to the heat loss through radiation amount Q of surrounding spaceKF:
In formula, φ is interphase RADIATION ANGLE COEFFICIENT, DKFor the outer diameter of bus shell, εKWFor outer surface of outer cover radiation coefficient, tKFor institute
It states shell to be averaged running temperature, t0Environment temperature.
4. temperature analysis method according to claim 1, which is characterized in that free convection of the conductor to the shell
Heat dissipation calculates
The conductor is calculated according to the following formula to the Natural Heat Convection amount Q of the shellMD:
In formula, λmFor heat transfer coefficient of the medium air under qualitative temperature, N'μFor modified Nu Saierte criterion numeral, δKFor bus
Outer casing thickness, DMFor the outer diameter of bus-bars conductor, tMIt is averaged running temperature for the conductor, tKIt is averaged running temperature for the shell.
5. temperature analysis method according to claim 1, which is characterized in that free convection of the shell to surrounding space
Heat dissipation calculates
The shell is calculated according to the following formula to the Natural Heat Convection amount Q of surrounding spaceKD:
QKD=π × α × DK×(tK-t0)
In formula, α is coefficient of heat transfer of the shell to surrounding space, DKFor the outer diameter of bus shell, t0For environment temperature, tKIt is described
Shell is averaged running temperature.
6. temperature analysis method according to claim 1, which is characterized in that the heat Calculation that the shell absorbs when sunshine
Include:
The heat Q that the shell absorbs when calculating sunshine according to the following formulaS:
QS=αS×DK×qS
In formula, αSFor the absorption coefficient of case surface, DKFor the outer diameter of bus shell, qSFor intensity of sunshine.
7. temperature analysis method as claimed in any of claims 1 to 6, which is characterized in that the temperature analysis side
Method further include:
After the temperature change and the heat dissipation law meet the temperature requirement, cooperation steam turbine high position arrangement is pacified
The long vertical section isolated-phase enclosed bus of dress carries out temperature monitoring, and the mode for carrying out temperature monitoring includes: to hang down in the length
Multiple temperature measuring points are arranged to carry out multi-point temperature measurement, or along the long vertical section isolated-phase enclosed bus length in straight section isolated-phase enclosed bus
Optical fiber is pasted to carry out continuous temperature measurement in its case surface in direction.
8. a kind of temperature analysis apparatus of thermoelectricity factory director vertical section isolated-phase enclosed bus, which is characterized in that the long vertical section from
The structural framing for each layer of steam turbine building that phase enclosed busbar is postponed using steam turbine high position cloth is fixed, and the long vertical section is from mutually sealing
Close nut line includes shell and the conductor that is placed in the shell, and the temperature analysis apparatus includes:
Temperature computation module, for the long vertical section isolated-phase enclosed bus is long by several uniform units are highly divided into
Degree, and be based on the shell and the corresponding equation of heat balance of the conductor, by along bus short transverse from bottom to up
Sequence calculate per unit length skin temperature and conductor temperature, and based on all calculated results be respectively formed the shell and
Conductor temperature corresponding under assigned work electric current with height change temperature rise curve, and it is true based on the temperature rise curve
Running temperature that the shell of the fixed long vertical section isolated-phase enclosed bus is averaged running temperature and conductor is averaged；
Radiate computing module, for being averaged running temperature based on the shell and the conductor is averaged running temperature, to each list
The long vertical section isolated-phase enclosed bus of bit length carries out heat dissipation calculating, wherein it includes the conductor to institute that the heat dissipation, which calculates,
The heat loss through radiation for stating shell calculates, the shell calculates the heat loss through radiation of surrounding space, the conductor to the shell from
The calorimeter that shell absorbs when right heat loss through convection calculates, the shell calculates the Natural Heat Convection of surrounding space and sunshine
It calculates；And
Judgment module, for based on the temperature rise curve and carry out it is described heat dissipation calculate calculated result, judge the shell and
Both described conductors hang down to the length when whether meeting steam turbine high position arrangement along the temperature change and heat dissipation law of short transverse
The temperature requirement of straight section isolated-phase enclosed bus.
9. temperature analysis apparatus according to claim 8, which is characterized in that the heat dissipation computing module includes:
First computing module, for calculating the conductor according to the following formula to the heat loss through radiation amount Q of the shellMF:
In formula, εnFor system radiation coefficient, DMFor the outer diameter of bus-bars conductor, tMIt is averaged running temperature for the conductor, tKIt is described
Shell is averaged running temperature；
Second computing module, for calculating the shell according to the following formula to the heat loss through radiation amount Q of surrounding spaceKF:
In formula, φ is interphase RADIATION ANGLE COEFFICIENT, DKFor the outer diameter of bus shell, εKWFor outer surface of outer cover radiation coefficient, t0Environment
Temperature；
Third computing module, for calculating the conductor according to the following formula to the Natural Heat Convection amount Q of the shellMD:
In formula, λmFor heat transfer coefficient of the medium air under qualitative temperature, N'μFor modified Nu Saierte criterion numeral, δKFor bus
Outer casing thickness；
4th computing module, for calculating the shell according to the following formula to the Natural Heat Convection amount Q of surrounding spaceKD:
QKD=π × α × DK×(tK-t0)
In formula, α is coefficient of heat transfer of the shell to surrounding space；
5th computing module, the heat Q that the shell absorbs when for calculating sunshine according to the following formulaS:
QS=αS×DK×qS
In formula, αSFor the absorption coefficient of case surface, qSFor intensity of sunshine.
10. temperature analysis apparatus according to claim 8 or claim 9, which is characterized in that the temperature analysis apparatus further include:
Temperature monitoring module, for full along the temperature change and heat dissipation law of short transverse in both the shell and the conductor
After the foot temperature requirement, the long vertical section isolated-phase enclosed bus installed to cooperation steam turbine high position arrangement carries out temperature
Degree monitoring, and the mode for carrying out temperature monitoring include: the long vertical section isolated-phase enclosed bus be arranged multiple temperature measuring points with into
Row multi-point temperature measurement, or optical fiber is pasted to carry out continuously in its case surface along the long vertical section isolated-phase enclosed bus length direction
Thermometric.
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| JP2009254104A (en) * | 2008-04-04 | 2009-10-29 | Mitsubishi Electric Corp | Conductor monitor for power receiving and distributing equipment |
| CN105138727A (en) * | 2015-07-23 | 2015-12-09 | 长江勘测规划设计研究有限责任公司 | Modeling method based on isolated phase bus natural hot pressing for underground power plant |
| CN105203885A (en) * | 2015-10-10 | 2015-12-30 | 上海博英信息科技有限公司 | Carrying capacity analysis method based on passive and wireless temperature measurement of ring main unit busbar |
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| JP2009254104A (en) * | 2008-04-04 | 2009-10-29 | Mitsubishi Electric Corp | Conductor monitor for power receiving and distributing equipment |
| CN105138727A (en) * | 2015-07-23 | 2015-12-09 | 长江勘测规划设计研究有限责任公司 | Modeling method based on isolated phase bus natural hot pressing for underground power plant |
| CN105203885A (en) * | 2015-10-10 | 2015-12-30 | 上海博英信息科技有限公司 | Carrying capacity analysis method based on passive and wireless temperature measurement of ring main unit busbar |
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