CN109358276A - Air clearance calculation method and device - Google Patents
Air clearance calculation method and device Download PDFInfo
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- CN109358276A CN109358276A CN201811456753.8A CN201811456753A CN109358276A CN 109358276 A CN109358276 A CN 109358276A CN 201811456753 A CN201811456753 A CN 201811456753A CN 109358276 A CN109358276 A CN 109358276A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/14—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring distance or clearance between spaced objects or spaced apertures
Abstract
This application discloses a kind of air clearance calculation method and devices, this method comprises: initialization Atmospheric corrections coefficient, substitutes into the first model for the Atmospheric corrections coefficient of initialization, calculate 50% impulse flashover voltage；50% impulse flashover voltage is substituted into the second model, calculates the first air gap distance；The second air gap distance is calculated according to the first air gap distance by following iterative manner: the first air gap distance being substituted into g parameter model, obtains g parameter；Atmospheric corrections coefficient is determined according to g parameter, substitutes into the first model, calculates 50% impulse flashover voltage；50% impulse flashover voltage is substituted into the second model, obtains the second air gap distance；If the absolute difference of the first air gap distance and the second air gap distance is less than preset threshold, using the second air gap distance as air clearance.The application can provide foundation for the determination of air clearance in practical application.
Description
Technical field
This application involves flexible direct current technical field more particularly to a kind of high-voltage large-capacity flexible direct current converter station valve hall and
DC fields air clearance calculation method and device.
Background technique
Flexible direct current technology gradually develops to high-voltage large-capacity direction in recent years.Since flexible direct current technology is with superior
Performance, therefore it has broad application prospects.Air clearance value is the important evidence of flexible direct current converter station design, is influenced
The arrangement and safe operation of flexible direct current converter station.It is gradually increased now with land resource requirement in short supply and environmental-friendly,
The electrical arrangement of converter station is more compact, and the air clearance at key point often seems that comparison is nervous, therefore air clearance
It checks very crucial.But flexible DC transmission voltage class multiplicity, temporarily specification or standard provide every kind of electricity not yet at present
Air clearance value corresponding to grade is pressed, so needing to calculate air clearance value in practical engineering applications.Therefore, how to calculate
The flexible direct current converter station valve hall of high-voltage large-capacity and the air clearance of DC fields become current urgent problem to be solved.
Summary of the invention
The embodiment of the present application provides a kind of air clearance calculation method, to mention for the determination of air clearance in practical application
For foundation, this method comprises:
According to the impact of Devices to test insulation withstanding voltage and the air gap impulse sparkover voltage coefficient of variation, air is determined
50% impulse sparkover voltage in gap；According to 50% impulse sparkover voltage, altitude correction factor and Atmospheric corrections coefficient, mark is established
The first model of 50% impulse flashover voltage is calculated under quasi- atmospheric conditions；According between the gap factor of electrode shape characteristic, air
Stand-off distance is from establishing under standard atmosphere condition and calculate the second model of 50% impulse flashover voltage；According to 50% impulse sparkover voltage,
Air gap distance, relative air density and the first parameter establish the g parameter model for calculating g parameter；Initialize Atmospheric corrections system
The Atmospheric corrections coefficient of initialization is substituted into the first model, calculates 50% impulse flashover voltage by number；By 50% impulse flashover voltage
The second model is substituted into, the first air gap distance is calculated；Second is calculated according to the first air gap distance by following iterative manner
Air gap distance: the first air gap distance is substituted into g parameter model, obtains g parameter；Atmospheric corrections is determined according to g parameter
Coefficient substitutes into the first model, calculates 50% impulse flashover voltage；50% impulse flashover voltage is substituted into the second model, obtains the
Two air gap distances；If the absolute difference of the first air gap distance and the second air gap distance is less than default threshold
Value, then using the second air gap distance as air clearance.
The embodiment of the present application also provides a kind of air clearance computing device, to the determination for air clearance in practical application
Foundation is provided, which includes:
Determining module, for being made a variation according to the impact of Devices to test insulation withstanding voltage and the air gap impulse sparkover voltage
Coefficient determines 50% impulse sparkover voltage of the air gap；Model building module, 50% punching for being determined according to determining module
Discharge voltage, altitude correction factor and Atmospheric corrections coefficient are hit, establishes under standard atmosphere condition and calculates 50% impulse flashover voltage
The first model；Model building module is also used to the gap factor according to electrode shape characteristic, air gap distance, establishes mark
The second model of 50% impulse flashover voltage is calculated under quasi- atmospheric conditions；Model building module is also used to be put according to 50% impact
Piezoelectric voltage, air gap distance, relative air density and the first parameter establish the g parameter model for calculating g parameter；Computing module,
For initializing Atmospheric corrections coefficient, the Atmospheric corrections coefficient of initialization is substituted into the first model that model building module is established,
Calculate 50% impulse flashover voltage；Computing module is also used to 50% impulse flashover voltage substituting into the second model, it is empty to calculate first
Gas clearance distance；Computing module is also used to calculate the second the air gap according to the first air gap distance by following iterative manner
Distance: the first air gap distance is substituted into g parameter model, obtains g parameter；Atmospheric corrections coefficient is determined according to g parameter, is substituted into
First model calculates 50% impulse flashover voltage；50% impulse flashover voltage is substituted into the second model, obtains the second the air gap
Distance；Determining module, if being also used to the first air gap distance of computing module calculating and the difference of the second air gap distance
It is worth absolute value and is less than preset threshold, then using the second air gap distance as air clearance.
The sky of a kind of high-voltage large-capacity flexible direct current current commutation station valve hall and DC fields is proposed in the embodiment of the present application
Gas free distance computation method in practical engineering applications can be special according to 50% impulse sparkover voltage, the electrode shape of Devices to test
The gap factor and Devices to test of property altitude correction factor, Atmospheric corrections coefficient and relative air density in the environment
Etc. parameters establish relevant to air gap distance model, and air clearance is determined using the method for iteration, for air clearance
Determination provides foundation.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of application for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.In the accompanying drawings:
Fig. 1 is a kind of flow chart of air clearance calculation method provided by the embodiments of the present application；
Fig. 2 is corresponding relationship between the operating impulse voltage and c of different air gap structures provided by the embodiments of the present application
Schematic diagram；
Fig. 3 is the relation schematic diagram of the first parameter k and h/ δ provided by the embodiments of the present application；
Fig. 4 is the relation schematic diagram of atmospheric density modified index m and g provided by the embodiments of the present application；
Fig. 5 is the relation schematic diagram of humidity modified index w and g provided by the embodiments of the present application；
Fig. 6 be it is provided by the embodiments of the present application under 1175KV operating impulse voltage, the second air gap distance is with opposite
The variation schematic diagram of humidity and peripheral temperature；
Fig. 7 be it is provided by the embodiments of the present application under 650KV operating impulse voltage, the second air gap distance is with relatively wet
The variation schematic diagram of degree and peripheral temperature；
Fig. 8 is the structure chart of air clearance computing device provided by the embodiments of the present application.
Specific embodiment
For the purposes, technical schemes and advantages of the embodiment of the present application are more clearly understood, with reference to the accompanying drawing to this Shen
Please embodiment be described in further details.Here, illustrative embodiments of the present application and the description thereof are used to explain the present application, but simultaneously
Not as the restriction to the application.
Term " first " and " second " in the description of the present application and attached drawing etc. be for distinguishing different objects, or
Person is used to distinguish the different disposal to same target, rather than is used for the particular order of description object.
In addition, the term " includes " being previously mentioned in the description of the present application and " having " and their any deformation, it is intended that
It is to cover and non-exclusive includes.Such as the process, method, system, product or equipment for containing a series of steps or units do not have
It is defined in listed step or unit, but optionally further comprising the step of other are not listed or unit, or optionally
It further include the other step or units intrinsic for these process, methods, product or equipment.
It should be noted that in the embodiment of the present application, " illustrative " or " such as " etc. words make example, example for indicating
Card or explanation.Be described as in the embodiment of the present application " illustrative " or " such as " any embodiment or design scheme do not answer
It is interpreted than other embodiments or design scheme more preferably or more advantage.Specifically, " illustrative " or " example are used
Such as " word is intended to that related notion is presented in specific ways.
The embodiment of the present application provides a kind of air clearance calculation method, as shown in Figure 1, the method comprising the steps of 101 to step
Rapid 108.It should be noted that step 102, step 103 and step 104 can be executed with random order, it is merely exemplary in Fig. 1
A kind of executive mode that above-mentioned 3 steps successively execute is shown, for the sequencing that 3 steps execute, is not done herein
It limits.
Step 101, insulate withstanding voltage and the air gap impulse sparkover voltage coefficient of variation according to the impact of Devices to test,
Determine 50% impulse sparkover voltage of the air gap.
Optionally, 50% impulse sparkover voltage U of the air gap of foundation50Model it is as follows:
Wherein, UWIt insulate withstanding voltage for the impact of Devices to test, according to the difference for the voltage type that Devices to test uses,
Lightning impulse withstand voltage (lightning impulse withstand voltage, LIWL) and switching impulse can be divided into
Withstanding voltage (switching impulse withstand voltage, SIWL), can join according to the design of Devices to test
Number determines；σ is the air gap impulse sparkover voltage coefficient of variation, is generally taken respectively to operating impulse voltage, lightning impulse voltage
6% and 3%.
Step 102, according to 50% impulse sparkover voltage, altitude correction factor and Atmospheric corrections coefficient, establish normal atmosphere
Under the conditions of calculate the first model of 50% impulse flashover voltage.
Optionally, 50% impulse flashover voltage U is calculated under the standard atmosphere condition of foundation50-corrThe first model are as follows:
Wherein, kaFor altitude correction factor, kbFor Atmospheric corrections coefficient.
kaIt is height above sea level related with height above sea level, the surge voltage type amendment system proposed according to IEC60071-2:1996
Number, which specify the calculation formula of 2000 meters of height above sea level (m) and following correction factor are as follows:
Wherein, H is the height above sea level of Devices to test position, and unit is rice；C is between surge voltage type and air
Related second parameter of gap structure.For lightning impulse voltage and power frequency withstanding voltage, the value of c is 1；Operation is rushed
Voltage is hit, c value is chosen from curve graph shown in Fig. 2, and Fig. 2 is the corresponding c of operating impulse voltage of different air gap structures.
Wherein, the corresponding air gap structure of curve 1 is mutually to insulate, and the corresponding air gap structure of curve 2 is minor insulation, curve 3
Corresponding air gap structure is phase insulation, and the corresponding air gap structure of curve 4 is stick-plate insulation.
Optionally, according to formula kb=k1k2Calculate Atmospheric corrections factor kb.Wherein, k1For air density correction factor, k2
For humidity correction factor.
Wherein, k1=δm。
In above formula, δ is relative air density, can be according to formulaIt is calculated.Wherein, p be to
The atmospheric pressure of measurement equipment position, p0For standard atmospheric pressure, t0For normal temperature, t1For Devices to test position
Temperature, m are atmospheric density modified index, are unknown parameter.t0It can be 20 degrees Celsius (DEG C).
Wherein, k2=kw。
In above formula, it is unknown parameter that w, which is humidity modified index,.K is the first parameter, by absolute humidity h and sky relatively
The ratio and voltage type of air tightness δ determines that voltage type includes DC voltage, alternating voltage and pulse voltage jointly.
Specifically, can be according to formulaCalculate absolute humidity h.Later, Devices to test is determined
The voltage type used；If Devices to test uses direct current (Direct Current, DC) voltage, then according to formula k=1
+0.014(h/δ-11)-0.00022(h/δ-11)2Calculate the first parameter k；If Devices to test uses exchange
(Alternating Current, AC) voltage then calculates the first parameter k according to formula k=1+0.012 (h/ δ -11)；If to
Measurement equipment uses pulse (Impulse) voltage, then calculates the first parameter k according to formula k=1+0.010 (h/ δ -11).Its
In, R is relative humidity, t2For the peripheral temperature of Devices to test.Refering to Fig. 3, be the first parameter k provided by the embodiments of the present application with
The graph of relation of h/ δ.
Optionally, according to formulaCalculate absolute humidity h, comprising: obtain historical data, determine
The peripheral temperature range of RH range and Devices to test；The sampling interval is set, at least two are obtained from RH range
A relative humidity sampled point obtains at least two peripheral temperature sampled points from peripheral temperature range；Any combination one opposite
Humidity sampled point and a peripheral temperature sampled point, calculate absolute humidity to be selected, obtain all relative humidity sampled points and periphery
The absolute humidity to be selected that the combination of temperature sampling point calculates；Absolute humidity to be selected maximum in absolute humidity to be selected is determined as absolutely
Humidity h.
It should be noted that the environment around the Devices to test in different location may be different, thus need according to
The historical data of measurement equipment ambient enviroment determines the RH range and peripheral temperature range of the environment.Between the sampling of setting
Every including relative humidity sampling interval and peripheral temperature sampling interval.Sampling interval can be by artificially determining, for the sampling interval
Specific size, it is not limited here.
In the embodiment of the present application, referring to the primary condition requirement of flexible direct current converter station valve hall, with RH range
It is 10%~50%, for peripheral temperature range is 10 DEG C~50 DEG C, using the relative humidity sampling interval 5%, peripheral temperature is adopted
5 DEG C of sample interval determines relative humidity sampled point and peripheral temperature sampled point respectively.Determining relative humidity sampled point is as follows:
10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, determining peripheral temperature sampled point is as follows: 10
℃,15℃,20℃,25℃,30℃,35℃,40℃,45℃,50℃.One relative humidity sampled point of any combination and a week
Side temperature sampling point, such as (10%, 10 DEG C), (10%, 15 DEG C) ... ..., (10%, 50 DEG C)；(15%, 10 DEG C), (15%, 15
DEG C) ... ..., (15%, 50 DEG C)；..., (50%, 50 DEG C).Bring said combination into formula respectivelyAbsolute humidity h is calculated, calculates first using absolute humidity h maximum in obtained absolute humidity h
Parameter k.
By the above process, the first model relevant to unknown parameter m and w can be obtained.
Step 103, the gap factor according to electrode shape characteristic, air gap distance, establish under standard atmosphere condition and count
Calculate the second model of 50% impulse flashover voltage.
Optionally, it according to the gap factor of electrode shape characteristic, air gap distance, establishes under standard atmosphere condition and calculates
Second model of 50% impulse flashover voltage, comprising: obtain the voltage type that Devices to test uses；If voltage type is operation
Surge voltage establishes the second model U then according to the gap factor n of electrode shape characteristic, air gap distance d50-corr=n ×
500×d0.6；If voltage type be lightning impulse voltage, according to the gap factor n of electrode shape characteristic, the air gap away from
From d, the second model U is established50-corr=n × 540 × d.
Wherein, n is the gap factor of electrode shape characteristic, and the size of n is related with electrode shape.
The gap factor of traditional electrode shape characteristic, with n0Indicate, do not consider specific electrode size, gap length and
Wall is closed on to n0Influence.Electrode size is considered in the embodiment of the present application, such as bulb diameter, ring diameter, gap length and valve
Room part combinational gap, such as closes on a face wall, for n0Influence, by n0It is improved to n.Wherein, gap shape such as ball-plate, valve
Female, pipe mother's (end is ring)-plate (parallel) of tower-plate, pipe mother-pipe etc..
Refering to following table one, table one shows bulb diameter and when gap length changes, n0With the n obtained after improvement:
Table one
It can be seen from upper table one when bulb diameter is identical, as gap length increases, n is gradually reduced；Bulb diameter subtracts
Small, downward trend is presented in n.
Refering to following table two, show after interstitial structure closes on one side equidistant ground connection wall, n0With the n obtained after improvement:
Table two
After a face wall is closed in gap, original interstice form factor n01 ratio need to be greater than divided by certain, through upper table analysis,
Consider that the ratio takes 1.06, closes on new gap factor value n after a face wall to obtain.
Step 104 is established according to 50% impulse sparkover voltage, air gap distance, relative air density and the first parameter
Calculate the g parameter model of g parameter.
Optionally, according to 50% impulse sparkover voltage U50, air gap distance d, relative air density δ and the first parameter k,
It establishes and calculates g parameter model
There are corresponding relationships between g parameter and m and w, and the corresponding relationship is as shown in following table three:
Table three
| g | m | w |
| G < 0.2 | 0 | 0 |
| 0.2≤g < 1.0 | g(g-0.2)/0.8 | g(g-0.2)/0.8 |
| 1.0≤g < 1.2 | 1.0 | 1.0 |
| 1.2≤g < 2.0 | 1.0 | (2.2-g)(2-g)/0.8 |
| G > 2.0 | 1.0 | 0 |
In addition, being the relationship of atmospheric density modified index m and g refering to Fig. 4；It is humidity modified index w and g refering to Fig. 5
Relationship.According to the relationship of m, w and g, the value of m, w can be determined by the value of g.
Step 105, initialization Atmospheric corrections coefficient, substitute into the first model for the Atmospheric corrections coefficient of initialization, calculate
50% impulse flashover voltage.
In the embodiment of the present application, the value for initializing m, w is 0, and k can be calculated in this way1、k2Value be 1, further
Atmospheric corrections coefficient k is calculatedbIt is 1, altitude correction factor can be according to the formula proposed in step 101Meter
It obtains, 50% impact can be calculated according to the Atmospheric corrections coefficient of initialization and the altitude correction factor being calculated and dodged
Network voltage U50-corrValue.
50% impulse flashover voltage is substituted into the second model by step 106, calculates the first air gap distance.
Since the second model is equally used for calculating U50-corr, the U that will be calculated in step 10550-corrBring the second mould into
The value of the parameter d in the second model can be obtained in type.
Step 107 calculates the second air gap distance according to the first air gap distance by following iterative manner: by first
Air gap distance substitutes into g parameter model, obtains g parameter；Atmospheric corrections coefficient is determined according to g parameter, substitutes into the first model, meter
Calculate 50% impulse flashover voltage；50% impulse flashover voltage is substituted into the second model, obtains the second air gap distance.
It brings the d value being calculated in step 106 into g parameter model, the value of g can be calculated, it may further root
The value that m, w are determined according to the relationship of g and m, w in the value and table three of g, has also determined that Atmospheric corrections coefficient.Later by Atmospheric corrections
Coefficient, altitude correction factor bring the first model, available 50% impulse flashover voltage U into50-corr, bring the second model into, it can
To obtain second d value.
If the absolute difference of step 108, the first air gap distance and the second air gap distance is less than default threshold
Value, then using the second air gap distance as air clearance.
Wherein, preset threshold is an error amount, can be by being artificially arranged.For the specific size of preset threshold,
This is without limitation.
If the absolute difference of first d value and second d value obtained in step 107 obtained in step 106 is small
In preset threshold, then second d value obtained in step 107 is determined as air clearance.
Optionally, it is preset if the absolute difference of the first air gap distance and the second air gap distance is more than or equal to
Threshold value, then method further include: following steps are repeated, until the difference of the first air gap distance and the second air gap distance
It is worth absolute value and is less than preset threshold, using the second air gap distance as air clearance: substituting the with the second air gap distance
One air gap distance calculates the second air gap distance by above-mentioned iterative manner again.
That is, if the difference of second d value obtained in first d value and step 107 obtained in step 106
Absolute value is more than or equal to preset threshold, then use second d value obtained in step 107 as the first air distance, calculating the
Third d value is determined as by three d values if the absolute difference of third d value and second d value is less than preset threshold
Air clearance；If the absolute difference of third d value and second d value is more than or equal to preset threshold, continue to calculate the 4th
A d value, until the absolute difference for the adjacent two d value being calculated is less than preset threshold.
If the voltage type that Devices to test uses includes operating impulse voltage and lightning impulse voltage, respectively according to behaviour
Make corresponding second model of corresponding second model of surge voltage, lightning impulse voltage and calculate air clearance, takes two air net
Away from middle the greater as finally determining air clearance.
The sky of a kind of high-voltage large-capacity flexible direct current current commutation station valve hall and DC fields is proposed in the embodiment of the present application
Gas free distance computation method in practical engineering applications can be special according to 50% impulse sparkover voltage, the electrode shape of Devices to test
The gap factor and Devices to test of property altitude correction factor, Atmospheric corrections coefficient and relative air density in the environment
Etc. parameters establish relevant to air gap distance model, and air clearance is determined using the method for iteration, for air clearance
Determination provides foundation.
Below above-mentioned air clearance calculation method will be introduced by taking certain ± 500kV flexible direct current converter station as an example.
The environmental condition of the converter station is as shown in following table four:
Table four
| Environmental condition type | Parameter |
| Height above sea level | 1345m |
| Long-term minimum operating temperature~long-term maximum operating temperature | 10-45℃ |
| Extreme minimum operating temperature~extreme maximum temperature | 10~50 DEG C |
| Long-term minimum operation humidity~long-term highest operating humidity | 10%~50% |
| Extreme minimum operation humidity~extreme highest operating humidity | 10%~60% |
| Retting-flax wastewater | Routinely direct current 14mm/kV |
The impact insulation withstanding voltage of the end of converter station flexible direct current each point over the ground is as shown in following table five:
Table five
It should be noted that the SIWL and LIWL of converter valve the air gap can be according to corresponding 3 column of SIWL and LIWL
The 1st column consider that other apparatus suggesteds consider according to recommendation in data.Neutral conductor equipment-put down anti-valve side Max (CBN1, CBN2,
E SIWL) can be considered by 650kV.
With RH range for 10%~50%, for peripheral temperature range is 10 DEG C~50 DEG C, using relative humidity
Sampling interval 5%, 5 DEG C of peripheral temperature sampling interval determine relative humidity sampled point and peripheral temperature sampled point respectively, count respectively
Calculate operating impulse voltage be 1175KV, 650KV when, the second air gap distance with relative humidity and peripheral temperature variation, such as
Shown in Fig. 6 and Fig. 7.
It can be seen from figures 6 and 7 that air clearance is larger, and maximum air clearance exists when relative humidity minimum (10%)
Peripheral temperature obtains when being 40 DEG C.
According to air clearance calculation method above-mentioned, considers the influence of the gap factor of electrode shape characteristic, can calculate
The minimum air clearance of valve hall and DC fields.Bridge arm reactance valve side, direct current reactance valve side, direct-current polar air clearance such as following table
Shown in six:
Table six
| Gap factor | Operating impulse voltage (kV) | Air clearance (mm) | Lightning impulse voltage (kV) | Air clearance (mm) |
| 1 | 1175 | 5254 | 1425 | 3334 |
| 1.05 | 1175 | 4997 | 1425 | 3174 |
| 1.1 | 1175 | 4782 | 1425 | 3029 |
| 1.15 | 1175 | 4603 | 1425 | 2896 |
| 1.2 | 1175 | 4453 | 1425 | 2775 |
| 1.25 | 1175 | 4328 | 1425 | 2664 |
| 1.3 | 1175 | 4225 | 1425 | 2561 |
| 1.35 | 1175 | 4141 | 1425 | 2466 |
| 1.4 | 1175 | 3914 | 1425 | 2377 |
| 1.45 | 1175 | 3692 | 1425 | 2295 |
| 1.5 | 1175 | 3489 | 1425 | 2219 |
Neutral conductor equipment-puts down the air clearance of anti-valve side Max (CBN1, CBN2, E) as shown in following table seven:
Table seven
A+~A-, A+~B-, pole bus~neutral bus air clearance are as shown in following table eight:
Table eight
| Gap factor | Switching impulse (kV) | Air clearance (mm) |
| 1 | 1400 | 6771 |
| 1.05 | 1400 | 6406 |
| 1.1 | 1400 | 6097 |
| 1.15 | 1400 | 5835 |
| 1.2 | 1400 | 5613 |
| 1.25 | 1400 | 5426 |
| 1.3 | 1400 | 5267 |
| 1.35 | 1400 | 5134 |
| 1.4 | 1400 | 5023 |
| 1.45 | 1400 | 4931 |
| 1.5 | 1400 | 4672 |
According to resulting air clearance is calculated in upper table, multiplied by suitable safety coefficient as between the actual air of engineering
Gap carries out valve hall and DC fields design.
The embodiment of the present application also provides a kind of air clearance computing device, as shown in figure 8, the device 800 includes determining mould
Block 801, model building module 802, computing module 803.
Wherein it is determined that module 801, for according to the impact of Devices to test insulation withstanding voltage and the air gap impulsive discharge
The voltage coefficient of variation determines 50% impulse sparkover voltage of the air gap.
Model building module 802,50% impulse sparkover voltage, height above sea level amendment system for being determined according to determining module 801
Several and Atmospheric corrections coefficient, establishes under standard atmosphere condition and calculates the first model of 50% impulse flashover voltage.
Model building module 802 is also used to the gap factor according to electrode shape characteristic, air gap distance, establishes mark
The second model of 50% impulse flashover voltage is calculated under quasi- atmospheric conditions.
Model building module 802 is also used to according to 50% impulse sparkover voltage, air gap distance, relative air density
The g parameter model for calculating g parameter is established with the first parameter.
The Atmospheric corrections coefficient of initialization is substituted into model foundation for initializing Atmospheric corrections coefficient by computing module 803
The first model that module 802 is established calculates 50% impulse flashover voltage.
Computing module 803, be also used to by 50% impulse flashover voltage substitute into the second model, calculate the first the air gap away from
From.
Computing module 803 is also used to calculate the second the air gap according to the first air gap distance by following iterative manner
Distance: the first air gap distance is substituted into g parameter model, obtains g parameter；Atmospheric corrections coefficient is determined according to g parameter, is substituted into
First model calculates 50% impulse flashover voltage；50% impulse flashover voltage is substituted into the second model, obtains the second the air gap
Distance.
Determining module 801, if being also used to the first air gap distance and the second the air gap of the calculating of computing module 803
The absolute difference of distance is less than preset threshold, then using the second air gap distance as air clearance.
Optionally, it is preset if the absolute difference of the first air gap distance and the second air gap distance is more than or equal to
Threshold value, then computing module 803 is also used to: following steps is repeated, until the first air gap distance and the second the air gap
The absolute difference of distance be less than preset threshold, using the second air gap distance as air clearance: with the second the air gap away from
From the first air gap distance is substituted, the second air gap distance is calculated by above-mentioned iterative manner again.
Optionally, module establishes module 802, is used for:
According to formulaCalculate altitude correction factor ka；
According to formula kb=k1k2Calculate Atmospheric corrections factor kb；
According to formulaEstablish the first model U50-corr；
Wherein, U50For 50% impulse sparkover voltage, H is the height above sea level of Devices to test position, and c is the second parameter,
k1For air density correction factor, k2For humidity correction factor.
Optionally, model building module 802 are also used to:
According to formulaCalculate relative air density δ；
According to formula k1=δmCalculate air density correction factor k1；
According to formula k2=kwCalculate humidity correction factor k2；
Wherein, p is the atmospheric pressure of Devices to test position, p0For standard atmospheric pressure, t0For normal temperature, t1For
The temperature of Devices to test position, k are the first parameter, and m is atmospheric density modified index, and w is humidity modified index.
Optionally, module establishes module 802, is also used to:
According to formulaCalculate absolute humidity h；
Determine the voltage type that Devices to test uses；
If Devices to test uses DC voltage, according to formula k=1+0.014 (h/ δ -11) -0.00022 (h/
δ-11)2Calculate the first parameter k；
If Devices to test uses alternating voltage, the first parameter is calculated according to formula k=1+0.012 (h/ δ -11)
k；
If Devices to test uses pulse voltage, the first parameter is calculated according to formula k=1+0.010 (h/ δ -11)
k；
Wherein, R is relative humidity, t2For the peripheral temperature of Devices to test.
Optionally, model building module 802 are used for:
Historical data is obtained, determines the peripheral temperature range of RH range and Devices to test；
The sampling interval is set, at least two relative humidity sampled points are obtained from RH range, from peripheral temperature model
Enclose at least two peripheral temperature sampled points of middle acquisition；
One relative humidity sampled point of any combination and a peripheral temperature sampled point, calculate absolute humidity to be selected, obtain
All relative humidity sampled points and the total absolute humidity to be selected calculated of peripheral temperature groups of samples；
Absolute humidity to be selected maximum in absolute humidity to be selected is determined as absolute humidity h.
Optionally, model building module 802 are used for:
Obtain the voltage type that Devices to test uses；
If voltage type is operating impulse voltage, according to the gap factor n of electrode shape characteristic, air gap distance
D establishes the second model U50-corr=n × 500 × d0.6；
If voltage type is lightning impulse voltage, according to the gap factor n of electrode shape characteristic, air gap distance
D establishes the second model U50-corr=n × 540 × d.
Optionally, model building module 802, comprising:
According to 50% impulse sparkover voltage U50, air gap distance d, relative air density δ and the first parameter k, establish meter
Calculate g parameter model
The sky of a kind of high-voltage large-capacity flexible direct current current commutation station valve hall and DC fields is proposed in the embodiment of the present application
Gas free distance computation method in practical engineering applications can be special according to 50% impulse sparkover voltage, the electrode shape of Devices to test
The gap factor and Devices to test of property altitude correction factor, Atmospheric corrections coefficient and relative air density in the environment
Etc. parameters establish relevant to air gap distance model, and air clearance is determined using the method for iteration, for air clearance
Determination provides foundation.
The embodiment of the present application also provides a kind of computer equipment, including memory, processor and storage are on a memory simultaneously
The computer program that can be run on a processor, processor realize air clearance calculation method when executing computer program.
The embodiment of the present application also provides a kind of computer readable storage medium, and computer-readable recording medium storage has execution
The computer program of air clearance calculation method.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Particular embodiments described above has carried out further in detail the purpose of the application, technical scheme and beneficial effects
It describes in detail bright, it should be understood that the foregoing is merely the specific embodiment of the application, is not used to limit the guarantor of the application
Range is protected, within the spirit and principles of this application, any modification, equivalent substitution, improvement and etc. done should be included in this
Within the protection scope of application.
Claims (16)
1. a kind of air clearance calculation method, which is characterized in that the described method includes:
According to the impact of Devices to test insulation withstanding voltage and the air gap impulse sparkover voltage coefficient of variation, the air gap is determined
50% impulse sparkover voltage；
According to 50% impulse sparkover voltage, altitude correction factor and Atmospheric corrections coefficient, establishes under standard atmosphere condition and calculate
First model of 50% impulse flashover voltage；
According to the gap factor of electrode shape characteristic, air gap distance, establishes under standard atmosphere condition and calculate 50% impact sudden strain of a muscle
Second model of network voltage；
The g for calculating g parameter is established according to 50% impulse sparkover voltage, air gap distance, relative air density and the first parameter
Parameter model；
Atmospheric corrections coefficient is initialized, the Atmospheric corrections coefficient of initialization is substituted into the first model, calculates 50% impulse flashover electricity
Pressure；
50% impulse flashover voltage is substituted into the second model, calculates the first air gap distance；
The second air gap distance is calculated according to the first air gap distance by following iterative manner: by the first air gap distance
G parameter model is substituted into, g parameter is obtained；Atmospheric corrections coefficient is determined according to g parameter, substitutes into the first model, is calculated 50% impact and is dodged
Network voltage；50% impulse flashover voltage is substituted into the second model, obtains the second air gap distance；
If the absolute difference of the first air gap distance and the second air gap distance is less than preset threshold, by the second sky
Gas clearance distance is as air clearance.
2. the method according to claim 1, wherein if the first air gap distance and the second the air gap away from
From absolute difference be more than or equal to preset threshold, then the method also includes: following steps are repeated, until the first air
The absolute difference of clearance distance and the second air gap distance is less than preset threshold, using the second air gap distance as air
Clear distance:
The first air gap distance is substituted with the second air gap distance, calculates the second the air gap by above-mentioned iterative manner again
Distance.
3. the method according to claim 1, wherein described according to 50% impulse sparkover voltage, height above sea level amendment system
Several and Atmospheric corrections coefficient, establishes under standard atmosphere condition and calculates the first model of 50% impulse flashover voltage, comprising:
According to formulaCalculate altitude correction factor ka；
According to formula kb=k1k2Calculate Atmospheric corrections factor kb；
According to formulaEstablish the first model U50-corr；
Wherein, U50For 50% impulse sparkover voltage, H is the height above sea level of Devices to test position, and c is the second parameter, k1For
Air density correction factor, k2For humidity correction factor.
4. according to the method described in claim 3, it is characterized in that, described according to formula kb=k1k2Calculate Atmospheric corrections factor
kb, comprising:
According to formulaCalculate relative air density δ；
According to formula k1=δmCalculate air density correction factor k1；
According to formula k2=kwCalculate humidity correction factor k2；
Wherein, p is the atmospheric pressure of Devices to test position, p0For standard atmospheric pressure, t0For normal temperature, t1It is to be measured
The temperature of equipment position, k are the first parameter, and m is atmospheric density modified index, and w is humidity modified index.
5. according to the method described in claim 4, it is characterized in that, according to formula k2=kwCalculate humidity correction factor k2It
Before, the method also includes:
According to formulaCalculate absolute humidity h；
Determine the voltage type that Devices to test uses；
If Devices to test uses DC voltage, according to formula k=1+0.014 (h/ δ -11) -0.00022 (h/ δ -11)2
Calculate the first parameter k；
If Devices to test uses alternating voltage, the first parameter k is calculated according to formula k=1+0.012 (h/ δ -11)；
If Devices to test uses pulse voltage, the first parameter k is calculated according to formula k=1+0.010 (h/ δ -11)；
Wherein, R is relative humidity, t2For the peripheral temperature of Devices to test.
6. according to the method described in claim 5, it is characterized in that, according to formulaIt calculates absolutely wet
Spend h, comprising:
Historical data is obtained, determines the peripheral temperature range of RH range and Devices to test；
The sampling interval is set, at least two relative humidity sampled points are obtained from RH range, from peripheral temperature range
Obtain at least two peripheral temperature sampled points；
One relative humidity sampled point of any combination and a peripheral temperature sampled point, calculate absolute humidity to be selected, are owned
Relative humidity sampled point and the total absolute humidity to be selected calculated of peripheral temperature groups of samples；
Absolute humidity to be selected maximum in absolute humidity to be selected is determined as absolute humidity h.
7. the method according to claim 1, wherein the gap factor according to electrode shape characteristic, air
Clearance distance is established under standard atmosphere condition and calculates the second model of 50% impulse flashover voltage, comprising:
Obtain the voltage type that Devices to test uses；
If voltage type is that operating impulse voltage is built according to the gap factor n of electrode shape characteristic, air gap distance d
Vertical second model U50-corr=n × 500 × d0.6；
If voltage type is that lightning impulse voltage is built according to the gap factor n of electrode shape characteristic, air gap distance d
Vertical second model U50-corr=n × 540 × d.
8. the method according to claim 1, wherein according to 50% impulse sparkover voltage, air gap distance, phase
The g parameter model for calculating g parameter is established to atmospheric density and the first parameter, comprising:
According to 50% impulse sparkover voltage U50, air gap distance d, relative air density δ and the first parameter k, establish and calculate g ginseng
Exponential model
9. a kind of air clearance computing device, which is characterized in that described device includes:
Determining module, for according to the impact of Devices to test insulation withstanding voltage and the air gap impulse sparkover voltage variation lines
Number, determines 50% impulse sparkover voltage of the air gap；
Model building module, 50% impulse sparkover voltage, altitude correction factor and atmosphere for being determined according to determining module are repaired
Positive coefficient is established under standard atmosphere condition and calculates the first model of 50% impulse flashover voltage；
Model building module is also used to the gap factor according to electrode shape characteristic, air gap distance, establishes normal atmosphere item
The second model of 50% impulse flashover voltage is calculated under part；
Model building module is also used to according to 50% impulse sparkover voltage, air gap distance, relative air density and the first ginseng
Number establishes the g parameter model for calculating g parameter；
The Atmospheric corrections coefficient of initialization is substituted into model building module and built by computing module for initializing Atmospheric corrections coefficient
The first vertical model calculates 50% impulse flashover voltage；
Computing module is also used to 50% impulse flashover voltage substituting into the second model, calculates the first air gap distance；
Computing module is also used to calculate the second air gap distance according to the first air gap distance by following iterative manner: will
First air gap distance substitutes into g parameter model, obtains g parameter；Atmospheric corrections coefficient is determined according to g parameter, substitutes into the first mould
Type calculates 50% impulse flashover voltage；50% impulse flashover voltage is substituted into the second model, obtains the second air gap distance；
Determining module, if being also used to the first air gap distance of computing module calculating and the difference of the second air gap distance
Absolute value is less than preset threshold, then using the second air gap distance as air clearance.
10. device according to claim 9, which is characterized in that if the first air gap distance and the second the air gap
The absolute difference of distance is more than or equal to preset threshold, then the computing module is also used to: following steps are repeated, until the
The absolute difference of one air gap distance and the second air gap distance is less than preset threshold, and the second air gap distance is made
For air clearance:
The first air gap distance is substituted with the second air gap distance, calculates the second the air gap by above-mentioned iterative manner again
Distance.
11. device according to claim 9, which is characterized in that module establishes module, is used for:
According to formulaCalculate altitude correction factor ka；
According to formula kb=k1k2Calculate Atmospheric corrections factor kb；
According to formulaEstablish the first model U50-corr；
Wherein, U50For 50% impulse sparkover voltage, H is the height above sea level of Devices to test position, and c is the second parameter, k1For
Air density correction factor, k2For humidity correction factor.
12. device according to claim 11, which is characterized in that model building module is also used to:
According to formulaCalculate relative air density δ；
According to formula k1=δmCalculate air density correction factor k1；
According to formula k2=kwCalculate humidity correction factor k2；
Wherein, p is the atmospheric pressure of Devices to test position, p0For standard atmospheric pressure, t0For normal temperature, t1It is to be measured
The temperature of equipment position, k are the first parameter, and m is atmospheric density modified index, and w is humidity modified index.
13. device according to claim 12, which is characterized in that module establishes module, is also used to:
According to formulaCalculate absolute humidity h；
Determine the voltage type that Devices to test uses；
If Devices to test uses DC voltage, according to formula k=1+0.014 (h/ δ -11) -0.00022 (h/ δ -11)2
Calculate the first parameter k；
If Devices to test uses alternating voltage, the first parameter k is calculated according to formula k=1+0.012 (h/ δ -11)；
If Devices to test uses pulse voltage, the first parameter k is calculated according to formula k=1+0.010 (h/ δ -11)；
Wherein, R is relative humidity, t2For the peripheral temperature of Devices to test.
14. device according to claim 13, which is characterized in that model building module is used for:
Historical data is obtained, determines the peripheral temperature range of RH range and Devices to test；
The sampling interval is set, at least two relative humidity sampled points are obtained from RH range, from peripheral temperature range
Obtain at least two peripheral temperature sampled points；
One relative humidity sampled point of any combination and a peripheral temperature sampled point, calculate absolute humidity to be selected, are owned
Relative humidity sampled point and the total absolute humidity to be selected calculated of peripheral temperature groups of samples；
Absolute humidity to be selected maximum in absolute humidity to be selected is determined as absolute humidity h.
15. a kind of computer equipment including memory, processor and stores the meter that can be run on a memory and on a processor
Calculation machine program, which is characterized in that the processor realizes any side of claim 1 to 8 when executing the computer program
Method.
16. a kind of computer readable storage medium, which is characterized in that the computer-readable recording medium storage has perform claim
It is required that the computer program of 1 to 8 any the method.
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