CN109033597A - One kind is with CO2Gas is the calculation method of parameters of the disconnecting switch of dielectric - Google Patents
One kind is with CO2Gas is the calculation method of parameters of the disconnecting switch of dielectric Download PDFInfo
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- CN109033597A CN109033597A CN201810780582.8A CN201810780582A CN109033597A CN 109033597 A CN109033597 A CN 109033597A CN 201810780582 A CN201810780582 A CN 201810780582A CN 109033597 A CN109033597 A CN 109033597A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
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Abstract
The invention discloses one kind with CO2Gas is the calculation method of parameters of the disconnecting switch of dielectric, and be related to high-voltage switch gear field, including following key step: step 1 determines filled CO in disconnecting switch2The pressure P and its voltage rating U of gas；Step 2, according to CO2Gas pressure P calculates CO at this pressure2The design of gas allows field strength E1；Step 3, the voltage rating U according to locating for disconnecting switch and design allow field strength E1, calculate fracture and open away from lk；Step 4 is opened according to fracture away from lkCalculate contact shield diameter dp；Step 5, according to shielding end fillet R, calculate field strength E at thisb；According to the parameters that step 1~step 5 calculates, optimize disconnecting switch.The present invention provides a set of design cycle, by test and emulate give each calculation formula needed for parameter, filled up with CO2Gas designs the blank of the design criteria of disconnecting switch for dielectric.
Description
Technical field
The present invention relates to high-voltage switch gear fields, more particularly to one kind is with CO2Gas is the ginseng of the disconnecting switch of dielectric
Number calculating method.
Background technique
Disconnecting switch is mainly used for isolating power supply, grid switching operation, connection and cutting low current circuit, is the main member of GIS
One of part, it is desirable that there is high reliability and safety.
SF6It is common insulating gas, due to its excellent insulation and arc extinction performance, SF is filled in disconnecting switch6Gas
Clearance for insulation can effectively be shortened, to reduce equipment size.But SF6It is a kind of serious greenhouse gases, it is complete
The ball potential (Global Warming Potential, GWP) that warms is about CO223900 times, be to lead to global warming
One of an important factor for.1997, " third time United Nations Framework Convention on Climate Change " was qualitative for greenhouse gases by its；Together
Year, " Kyodo Protocol book " is inner to be classified as one of six atmospherics that need to strictly limit its discharge, and due to its atmospheric lifetime pole
It is long, it is listed in first of greenhouse gases list.Therefore, seek environmental-friendly, function admirable SF6Substituting gas is always to be somebody's turn to do
One important research direction and hot issue in field.
The design cycle of disconnecting switch in traditional GIS, including fracture are opened away from design, fracture shielding design etc., are related to big
Parameter is measured, and only for being SF with insulating gas6The disconnecting switch of gas, with SF6It can not for the calculation method of parameters of insulating gas
It directly applies to CO2Gas is in the New Type Isolating Switch design of dielectric.
Therefore, those skilled in the art is dedicated to developing one kind with CO2Gas is the ginseng of the disconnecting switch of dielectric
Number calculating method, can be to avoid SF6The use of gas mitigates greenhouse effects, while significantly reducing disconnecting switch in GIS
Production cost.
Summary of the invention
In view of the above drawbacks of the prior art, technical problem to be solved by the invention is to provide one kind with CO2Gas
For the calculation method of parameters of the disconnecting switch of dielectric, SF is avoided6The use of gas mitigates greenhouse effects, and greatly
Reduce the production cost of disconnecting switch in GIS.
To achieve the above object, the present invention provides one kind with CO2Gas is the parameter meter of the disconnecting switch of dielectric
Calculation method, which is characterized in that the method includes following key steps:
Step 1 determines filled CO in disconnecting switch according to design requirement2The pressure P (MPa) and its voltage rating U of gas
(kV)；
Step 2, according to CO2Gas pressure P calculates CO at this pressure2The design of gas allows field strength E1；
Step 3 allows field strength E according to disconnecting switch voltage rating U and design1, calculate fracture and open away from lk；
Step 4 is opened according to fracture away from lkCalculate contact shield diameter dp；
Step 5, the fillet R according to shielding case end, calculate the field strength E near the fillet Rb；
Step 6, the parameters calculated according to step 1~step 5, optimize the disconnecting switch.
Further, the design allows field strength E1It is represented by following formula (1):
E1=E* (1-3 σ) * K2/K (1)
Wherein, E CO2The critical breakdown strength of gas, E=46.12*P0.7(kV/mm)；σ is that lightning impulse and operation are rushed
The discharge voltage standard deviation relative value hit, σ=0.05；K2For CO2The nargin coefficient of gas, K2=0.85；
K is impact coefficient, K=1.46.
Further, the fracture is opened away from lkIt is represented by following formula (2):
lk=K6K11Us/E1 (2)
Wherein, K6For design margin, K6=1.16；K11Coefficient, U are unevenly distributed for fracture voltagesFor fracture lightning impulse
Withstanding voltage.
Further, the fracture voltage is unevenly distributed COEFFICIENT K11According to different voltage rating values.
Further, the contact shield diameter dpIt is represented by following formula (3):
dp=(2~3) lk (3)
Further, the field strength E near the fillet RbIt is represented by following formula (4):
Eb=Ea(4.9-2.25dp/D)(200R/D)-0.3 (4)
Wherein, EaFor the calculating field strength on shielded side cylindrical surface, Ea=2K11Us/(D-dp), D is disconnecting switch minimal design
Internal diameter.
Further, the field strength E near the fillet R of the shielding case endbAllow field strength E less than the design1。
Further, the field strength E near the fillet RbAllow field strength E equal to the design1When, it can find out and keep apart
Close minimal design internal diameter D.
Further, according to aforementioned parameters calculated, optimize the size of the disconnecting switch.
It compares compared with prior art, the present invention has the advantage that and feature:
(1) present invention employs existing gas CO a large amount of in atmosphere2For dielectric, raw material sources are extensive, save big
Production cost is measured, there is significant economic benefit；
(2) the invention avoids SF6The use of gas, can reduce greenhouse effects, meet environmental requirements, and have significant
Social benefit；
(3) the present invention provides a set of design cycle, by test and emulate give each calculation formula needed for parameter,
It has filled up with CO2Gas designs the blank of the design criteria of disconnecting switch for dielectric；
(4) present invention can design satisfactory disconnecting switch to standardize process, at the same guarantee it is designed every
It is minimum to leave pass；
(5) the method for the present invention can fast implement the design of disconnecting switch structure, save experimentation cost, shorten the design cycle.
It is described further below with reference to technical effect of the attached drawing to design of the invention, specific structure and generation, with
It is fully understood from the purpose of the present invention, feature and effect.
Detailed description of the invention
Fig. 1 is of the present invention with CO2Gas is the flow chart of the calculation method of parameters of the disconnecting switch of dielectric；
Fig. 2 is using of the present invention with CO2Gas is the GIS of the calculation method of parameters of the disconnecting switch of dielectric
The sectional view of disconnecting switch.
Specific embodiment
A preferred embodiment of the present invention is introduced below with reference to Figure of description, keeps its technology contents more clear and just
In understanding.The present invention can be emerged from by many various forms of embodiments, and protection scope of the present invention not only limits
The embodiment that Yu Wenzhong is mentioned.
The design principle of present aspect method is to be touched with a series of elastic collisions with non-resilient by solving Boltzmann equation
It hits to describe the electron avalanche development process in gas, finally exports Electron energy distribution, ionization coefficient, attachment coefficient, drift speed
Degree and the parameters such as diffusion coefficient, thus the relationship between acquiring the critical breakdown strength and gas pressure of CO2 gas.By testing,
The design of CO2 gas allows field strength when demonstrating the accuracy of theoretical calculation, and then design disconnecting switch structure is calculated.
As shown in Figure 1, one kind is with CO2Gas is the calculation method of parameters of the disconnecting switch of dielectric, including following step
It is rapid:
S1, filled CO in disconnecting switch is determined according to design requirement2The pressure P and its voltage rating U of gas；
S2, according to CO2Gas pressure P calculates CO at this pressure2The design of gas allows field strength E1；
S3, field strength E is allowed according to disconnecting switch voltage rating U and design1, calculate fracture and open away from lk；
S4, it is opened according to fracture away from lkCalculate contact shield diameter dp；
S5, the fillet R according to shielding case end, calculate the field strength E near the fillet Rb；
S6, the parameters calculated according to step S1~step S5, optimize the disconnecting switch.
Detailed process is as follows:
Step S1: filled CO in disconnecting switch is determined according to design requirement2The pressure P (MPa) and its voltage rating U of gas
(kV)。
Step S2: according to the gas pressure P of step S1, CO at this pressure is calculated2The design of gas allows field strength E1If
Meter allows the calculation formula of field strength as follows:
E1=E* (1-3 σ) * K2/K
Wherein, E CO2The critical breakdown strength of gas, E=46.12*P0.7(kV/mm)；σ is that lightning impulse and operation are rushed
The discharge voltage standard deviation relative value hit, σ=0.05；K2For CO2The nargin coefficient of gas, K2=0.85；K is impact coefficient, K
=1.46.
Step S3: field strength E is allowed according to disconnecting switch voltage rating U and design1, calculate fracture and open away from lk, fracture opens away from lk
Calculation formula is as follows:
lk=K6K11Us/E1(mm)
Wherein, K6For design margin, K6=1.16；K11It is unevenly distributed coefficient for fracture voltage, is shown in Table 1；UsFor fracture thunder
Surge withstanding voltage.
1 fracture voltage of table is unevenly distributed coefficient and voltage rating value
| Voltage rating U/kV | 126 | 252 | 363 | 550 |
| Fracture voltage is unevenly distributed COEFFICIENT K11 | 1.5 | 1.4 | 1.3 | 1.2 |
Step S4: it is opened according to fracture away from lkCalculate contact shield diameter dp, the contact shield diameter dpCalculation formula is as follows
It is shown:
dp=(2~3) lk
Step S5: according to the fillet R of shielding case end, field strength E at this is calculatedb, field strength calculation formula is as follows:
Eb=Ea(4.9-2.25dp/D)(200R/D)-0.3
Wherein, EaFor the calculating field strength on shielded side cylindrical surface, Ea=2K11Us/(D-dp), D is disconnecting switch minimal design
Internal diameter, the field strength E at the fillet R of shielding case endbAllow field strength E less than design1, field strength at the shielding case end fillet R
EbAllow field strength E equal to design1When, disconnecting switch minimal design internal diameter D can be calculated.
Step S6: according to the evaluation of the parameters of step S1~S5, optimize with CO2Gas be dielectric every
The design size for leaving pass makes its size reach minimum.
If Fig. 2 is using of the present invention with CO2Gas is the GIS of the calculation method of parameters of the disconnecting switch of dielectric
Shown in the sectional view of disconnecting switch, including contact shield cover 1, disconnecting switch shell 2, spring touch finger 3, static contact 4 and moving contact
5.Wherein, the end of contact shield cover 1 has fillet R, and the field strength at fillet R is Eb, the contact shield diameter of contact shield cover 1
For dp, the distance of the inner sidewall of the upper end of contact shield cover 1 to disconnecting switch shell 2 is disconnecting switch minimal design diameter D, touching
The distance between head shielding case 1 is opened for fracture away from lk, the calculating field strength on shielded side cylindrical surface is Ea, according to the above calculating parameter,
Under the premise of meeting disconnecting switch performance requirement, the clearance for insulation of disconnecting switch interior insulation medium can be shortened by calculating, from
And achieve the purpose that reduce disconnecting switch design size.
The preferred embodiment of the present invention has been described in detail above.It should be appreciated that the ordinary skill of this field is without wound
The property made labour, which according to the present invention can conceive, makes many modifications and variations.Therefore, all technician in the art
Pass through the available technology of logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea
Scheme, all should be within the scope of protection determined by the claims.
Claims (8)
1. one kind is with CO2Gas is the calculation method of parameters of the disconnecting switch of dielectric, which is characterized in that the method includes
Following key step:
Step 1 determines filled CO in disconnecting switch according to design requirement2The pressure P and its voltage rating U of gas；
Step 2, according to CO2Gas pressure P calculates CO at this pressure2The design of gas allows field strength E1；
Step 3 allows field strength E according to disconnecting switch voltage rating U and design1, calculate fracture and open away from lk；
Step 4 is opened according to fracture away from lkCalculate contact shield diameter dp；
Step 5, the fillet R according to shielding case end, calculate the field strength E near the fillet Rb；
Step 6, the parameters calculated according to step 1~step 5, optimize the disconnecting switch.
2. as described in claim 1 with CO2Gas is the calculation method of parameters of the disconnecting switch of dielectric, which is characterized in that
Preferably, the design allows field strength E1It may be expressed as:
E1=E* (1-3 σ) * K2/K
Wherein, E CO2The critical breakdown strength of gas, E=46.12*P0.7(kV/mm)；σ is lightning impulse and switching impulse
Discharge voltage standard deviation relative value, σ=0.05；K2For CO2The nargin coefficient of gas, K2=0.85；
K is impact coefficient, K=1.46.
3. as described in claim 1 with CO2Gas is the calculation method of parameters of the disconnecting switch of dielectric, which is characterized in that
The fracture is opened away from lkIt may be expressed as:
lk=K6K11Us/E1
Wherein, K6For design margin, K6=1.16；K11Coefficient, U are unevenly distributed for fracture voltagesFor the tolerance of fracture lightning impulse
Voltage.
4. as claimed in claim 3 with CO2Gas is the calculation method of parameters of the disconnecting switch of dielectric, which is characterized in that
The fracture voltage is unevenly distributed COEFFICIENT K11According to different voltage rating values.
5. as described in claim 1 with CO2Gas is the calculation method of parameters of the disconnecting switch of dielectric, which is characterized in that
The contact shield diameter dpIt may be expressed as:
dp=(2~3) lk。
6. as described in claim 1 with CO2Gas is the calculation method of parameters of the disconnecting switch of dielectric, which is characterized in that
The field strength EbIt may be expressed as:
Eb=Ea(4.9-2.25dp/D)(200R/D)-0.3
Wherein, EaFor the calculating field strength on shielded side cylindrical surface, Ea=2K11Us/(D-dp), D is in disconnecting switch minimal design
Diameter.
7. as described in claim 1 with CO2Gas is the calculation method of parameters of the disconnecting switch of dielectric, which is characterized in that
Field strength E near the fillet R of the shielding case endbAllow field strength E less than the design1。
8. as described in claim 1 or 6 with CO2Gas is the calculation method of parameters of the disconnecting switch of dielectric, and feature exists
In field strength E near the fillet RbAllow field strength E equal to the design1When, disconnecting switch minimal design internal diameter can be found out
D。
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| CN201810780582.8A CN109033597A (en) | 2018-07-17 | 2018-07-17 | One kind is with CO2Gas is the calculation method of parameters of the disconnecting switch of dielectric |
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| CN201810780582.8A CN109033597A (en) | 2018-07-17 | 2018-07-17 | One kind is with CO2Gas is the calculation method of parameters of the disconnecting switch of dielectric |
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Application publication date: 20181218 |