CN104021269B - The acquisition methods of 2km 4km height above sea level 500kV electrical equipments relatively thunder and lightning and switching impulse height above sea level correction value - Google Patents
The acquisition methods of 2km 4km height above sea level 500kV electrical equipments relatively thunder and lightning and switching impulse height above sea level correction value Download PDFInfo
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Abstract
The invention discloses the acquisition methods of 2km 4km height above sea level 500kV electrical equipments relatively thunder and lightning and switching impulse height above sea level correction value, it is related to High aititude ehv power transmission engineering field.Technical key point：Step 1：According to formula Ka=（1.633‑1.278）/（4000‑2000）It is some region of soft bus lightning impulse dielectric level correction factor over the ground between 2000m 4000m that × (H 2000)+1.278 calculates height above sea level；H is height above sea level, and span is between 2000 meters to 4000 meters；Step 2：Inquire about the soft bus in 0 Altitude Regions lightning impulse dielectric level value over the ground；Step 3：Lightning impulse dielectric level value just obtains soft bus that height above sea level is H lightning impulse dielectric level height above sea level correction value over the ground over the ground to be multiplied by the soft bus in 0 Altitude Regions that step 2 inquires using adjusted coefficient K a.
Description
Technical field
The present invention relates to High aititude ehv power transmission engineering field.
Background technology
The area that more than 1000 meters of China's height above sea level accounts for 2/3rds of area, the mean sea level in four great plateaus
All in more than 1000m, west-to-east power transmission transformer station unavoidably will be by High aititude area.High altitude localities rarefaction of air, air pressure
Relatively low, the reduction of air insulation performance need to be modified to the external insulation of equipment.At present, in below height above sea level 2000m, domestic and international pin
A large amount of experimental studies were done to the air gap flash-over characteristic and equipment filth external insulation, more ripe High aititude equipment had been obtained
External insulation modification method, and amendment standard and specification are formd, but for 2000m and above area, especially for China west
Portion height above sea level 2000m-4000m areas, lack for Substation Electric Equipment the air gap thunder impulse discharge characteristics both at home and abroad
System research, it is unclear that how should select suitable electrical apparatus external insulation level and safety net distance.It is past in design process
It is past to be judged according to conventional engineering experience.
The content of the invention
In view of electrical apparatus external insulation level and air clearance by power-frequency overvoltage, lightning impulse overvoltage and operation punching
Overvoltage level determination is hit, the present invention is intended to provide a kind of 500kV electrical equipments for height above sea level 2000m-4000m are relatively
The acquisition methods of switching impulse withstanding voltage level and electrical equipment operating impulse voltage dielectric level over the ground, to high altitude localities
Electrical equipment operation impact dielectric level selection provides a kind of easy, feasible method in power engineering design.
The acquisition methods of the electrical equipment lightning impulse voltage dielectric level height above sea level correction value over the ground that the present invention is provided include
Following steps：
Step 1：Height above sea level is calculated according to formula Ka=(1.633-1.278)/(4000-2000) × (H-2000)+1.278
It is some region of soft bus lightning impulse dielectric level correction factor over the ground between 2000m-4000m to spend；Wherein H is height above sea level
Degree, span is between 2000 meters to 4000 meters；
Step 2：Inquire about the soft bus in 0 Altitude Regions lightning impulse dielectric level value over the ground；
Step 3：The soft bus in the 0 Altitude Regions lightning impulse insulation over the ground that step 2 is inquired is multiplied by using adjusted coefficient K a
Level value just obtains the soft bus lightning impulse dielectric level height above sea level correction value over the ground that height above sea level is H.
Further comprise following steps：
Step a1：Devise for high altitude localities relatively lightning impulse voltage Insulation Test model, the model with it is normal
Rule 500kV Substation Electric Equipments ratio is 1：1；
Step a2：Real model experiment is simulated in the test model of high altitude localities, soft bus and people is obtained
Word pipe support clearance criteria thunder impulse discharge characteristics curve and soft bus are bent to cross-arm clearance criteria thunder impulse discharge characteristics
Line.
The 2000m-4000m height above sea level 500kV grading ring relatively lightning impulse dielectric level height above sea level amendments that the present invention is provided
The acquisition methods of value, including：
Step 1：Height above sea level is calculated according to formula Ka=(1.640-1.283)/(4000-2000) × (H-2000)+1.283
It is some region of grading ring lightning impulse dielectric level correction factor over the ground between 2000m-4000m to spend；Wherein H is height above sea level
Degree, span is between 2000 meters to 4000 meters；
Step 2：Inquire about 0 Altitude Regions grading ring lightning impulse dielectric level value over the ground；
Step 3：The 0 Altitude Regions grading ring lightning impulse insulation over the ground that step 2 is inquired is multiplied by using adjusted coefficient K a
Level value just obtains the grading ring lightning impulse dielectric level height above sea level correction value over the ground that height above sea level is H.
Further, it is further comprising the steps of：
Step b1：Devise for high altitude localities relatively lightning impulse voltage Insulation Test model, the model with it is normal
Rule 500kV Substation Electric Equipments ratio is 1：1；
Step b2：Real model experiment is simulated in the test model of high altitude localities, is obtained horizontally disposed equal
Pressure ring to herringbone pipe support clearance criteria thunder impulse discharge characteristics curve, be arranged vertically grading ring to herringbone pipe support clearance criteria thunder
Surge discharge characteristic curve and grading ring are to herringbone pipe support clearance criteria thunder impulse discharge characteristics curve.
The 2000m-4000m height above sea level 500kV electrical equipments relatively switching impulse dielectric level selecting party that the present invention is provided
The acquisition methods of method height above sea level correction value, including：
Step a1：Devise for high altitude localities relatively operating impulse voltage Insulation Test model, the model with it is normal
Rule 500kV Substation Electric Equipments ratio is 1：1；
Step a2：Real model experiment is simulated in the test model of high altitude localities, soft bus is obtained to people
Word pipe support clearance criteria switching impulse discharge characteristic curve, horizontally disposed grading ring are put to herringbone pipe support clearance criteria switching impulse
Electrical characteristics curve and grading ring is arranged vertically to herringbone pipe support clearance criteria switching impulse discharge characteristic curve.
In sum, by adopting the above-described technical solution, the beneficial effects of the invention are as follows：
1. it is being 1 with conventional 500kV Substation Electric Equipments ratio that experimental data of the invention is：1 simulation model
Middle experiment, the experimental data for obtaining is very accurate, can truly reflect the electrical equipment of high altitude localities relatively lightning impulse electricity
Press electrical characteristics and electrical equipment relatively air gap operational impulsive discharge characteristic.
2. provide and be located at height above sea level 2000m-4000m height above sea level soft bus and grading ring lightning impulse voltage insulation water over the ground
Flat height above sea level amendment value-acquiring method, electrical equipment lightning impulse dielectric level selection in being designed to high altitude localities power engineering
A kind of easy, feasible method is provided.
3. present invention also offers the air gap operational impulsive discharge characteristic over the ground of electrical equipment at 2000m-4000m height above sea level
Correlation curve, the correction value of high altitude localities electrical equipment operating impulse voltage dielectric level over the ground can be obtained by tabling look-up,
Electrical equipment operation impact dielectric level selection provides a kind of easy, feasible side in being designed to high altitude localities power engineering
Method.
Brief description of the drawings
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein：
Fig. 1 is two to divide soft bus to herringbone pipe support clearance criteria thunder impulse discharge characteristics curve at 2254m height above sea level.
Fig. 2 is two to divide soft bus to cross-arm clearance criteria thunder impulse discharge characteristics curve at 2254m height above sea level.
Fig. 3 be 2254m height above sea level at horizontally disposed grading ring to herringbone pipe support clearance criteria thunder impulse discharge characteristics curve.
Fig. 4 is to be arranged vertically grading ring to herringbone pipe support clearance criteria thunder impulse discharge characteristics curve at 2254m height above sea level.
Fig. 5 is two to divide soft bus to herringbone pipe support clearance criteria thunder impulse discharge characteristics curve at 3742 height above sea level.
Fig. 6 is to be arranged vertically grading ring to herringbone pipe support clearance criteria thunder impulse discharge characteristics curve at 3742 height above sea level.
Fig. 7 is that the two soft buses of division discharge herringbone pipe support clearance criteria lightning impulse in the case of height above sea level 2000m-4000m
Character Comparison curve map.Wherein, curve from the bottom up corresponds to height above sea level 2254m, 3742m, 4000m respectively.
Fig. 8 is height above sea level 2000m-4000m situations lower uniform pressure ring to herringbone pipe support clearance criteria thunder impulse discharge characteristics pair
Compare curve map.Wherein, curve from the bottom up corresponds to height above sea level 2254m, 3742m, 4000m respectively.
Fig. 9 is that height above sea level 2254m places two divide soft buses to herringbone pipe support clearance criteria switching impulse discharge characteristic curve.
Figure 10 is that horizontally disposed grading ring is bent to herringbone pipe support clearance criteria switching impulse flash-over characteristic at height above sea level 2254m
Line.
Figure 11 is that grading ring is arranged vertically at height above sea level 2254m to herringbone pipe support clearance criteria switching impulse flash-over characteristic song
Line.
Figure 12 is that height above sea level 3742m places two divide soft buses to herringbone pipe support clearance criteria switching impulse discharge characteristic curve.
Figure 13 is that horizontally disposed grading ring is bent to herringbone pipe support clearance criteria switching impulse flash-over characteristic at height above sea level 3742m
Line.
Figure 14 is that height above sea level 2000m-4000m area electrical equipment relatively air gap operational impulsive discharge Character Comparisons are bent
Line.Wherein, curve from the bottom up is respectively gap for 5.54m, 5m, 4m, 3m.
Specific embodiment
All features disclosed in this specification, or disclosed all methods or during the step of, except mutually exclusive
Feature and/or step beyond, can combine by any way.
Any feature disclosed in this specification, unless specifically stated otherwise, can be equivalent or with similar purpose by other
Alternative features are replaced.I.e., unless specifically stated otherwise, each feature is an example in a series of equivalent or similar characteristics
.
The 2000m-4000m height above sea level 500kV soft bus relatively lightning impulse dielectric level height above sea level amendments that the present invention is provided
The acquisition methods of value, devise for high altitude localities relatively lightning impulse voltage Insulation Test model, the model and routine
500kV Substation Electric Equipments ratio is 1：1, that is to say, that the arrangement of each electrical equipment and routine 500kV power transformations in the model
Station is the same.The model is built in high altitude localities, experimental data can truly reflect high altitude localities electrical equipment gap
To the flash-over characteristic of lightning impulse voltage.
Step is simulated real model experiment in the test model of high altitude localities, obtains soft bus and herringbone tube
Frame clearance criteria thunder impulse discharge characteristics curve and soft bus are to cross-arm clearance criteria thunder impulse discharge characteristics curve；Such as
Fig. 1,2,5,7.Including data below：
Table 1-1
Table 1-2
Table 1-3
Table 1-4
According to above-mentioned figure line and tables of data, the soft bus the air gap in height above sea level 2000m-4000m areas lightning impulse is obtained
Electric discharge dielectric level altitude correction factor excursion is as follows：For in height above sea level 2000m-4000m height above sea level region, the air gap exists
When changing in the range of 3.0m-5.0m, the two soft buses of division then exist to framework tower leg lightning impulse voltage elevation correction index
Change between 1.278-1.633.
So as to obtain formula Ka=(1.633-1.278)/(4000-2000) × (H-2000)+1.278, for calculating sea
Degree of lifting is some region of soft bus lightning impulse dielectric level correction factor over the ground between 2000m-4000m；Wherein H is sea
Degree of lifting, span is between 2000 meters to 4000 meters.
Illustrated by taking soft bus at height above sea level 3000m as an example：
1. lightning impulse altitude correction factor Ka when 3000m is calculated using formula is (1.640-1.278)/(4000-
2000) × (3000-2000)+1.278=1.449；
2. the lightning impulse dielectric level that soft bus is required in height above sea level 0m is inquired about；
3. step 1 gained altitude correction factor is multiplied by using the soft bus lightning impulse dielectric level of 0m, you can obtain
The soft bus lightning impulse voltage dielectric level of 3000m height above sea level.
For grading ring also in this way, carry out lightning impulse overvoltage experiment in the model, obtain horizontally disposed pressing
Ring to herringbone pipe support clearance criteria thunder impulse discharge characteristics curve, be arranged vertically grading ring to herringbone pipe support clearance criteria thunder and lightning
Impulsive discharge characteristic curve and grading ring are to herringbone pipe support clearance criteria thunder impulse discharge characteristics curve, such as Fig. 3,4,6,8.
Including data below：
Table 1-5
Table 1-6
Table 1-7
Table 1-8
According to above-mentioned figure line and data, obtain height above sea level 2000m-4000m areas grading ring the air gap lightning impulse and put
The horizontal altitude correction factor excursion that is electrically insulated is as follows：When the air gap changes in the range of 3.0m-5.0m, grading ring
Tower leg lightning impulse altitude correction factor is changed between 1.283-1.640.
So as to obtain formula Ka=(1.640-1.283)/(4000-2000) × (H-2000)+1.283, for calculating sea
Degree of lifting is some region of grading ring lightning impulse dielectric level correction factor over the ground between 2000m-4000m；Wherein H is sea
Degree of lifting, span is between 2000 meters to 4000 meters.
Illustrated by taking grading ring at height above sea level 3000m as an example：
1. calculated according to formula Ka=(1.640-1.283)/(4000-2000) × (3000-2000)+1.283=1.462
Obtain at 3000m height above sea level grading ring lightning impulse dielectric level correction factor over the ground；
2. 0 Altitude Regions grading ring lightning impulse dielectric level value over the ground is inquired about；
3. 0 Altitude Regions grading ring that step 2 inquires lightning impulse dielectric level over the ground is multiplied by using adjusted coefficient K a
Value just obtains the grading ring lightning impulse dielectric level height above sea level correction value over the ground that height above sea level is 3000m.
Carry out soft bus, grading ring operating impulse voltage discharge test over the ground respectively in the model, obtain soft bus
Herringbone pipe support clearance criteria switching impulse discharge characteristic curve, horizontally disposed grading ring are operated to herringbone pipe support clearance criteria and rushed
Hit discharge characteristic curve, be arranged vertically grading ring to herringbone pipe support clearance criteria switching impulse discharge characteristic curve and height above sea level
2000m-4000m areas electrical equipment relatively air gap operational impulsive discharge Character Comparison curve, such as Fig. 9~14.
Including data below：
Table 2-1
Table 2-2
Table 2-3
Table 2-4
Table 2-5
Curve and tables of data are impacted according to aforesaid operations, can directly to 2000m-4000m areas using figure mode is looked into
500kV transformer stations 500kV electrical equipment operations impact dielectric level is selected.Lookup table mode is as follows：It is with height above sea level 3000m
Example, according to Figure 14.
For 500kV electrical equipments, choosing 4m gap curves as foundation is consulted (for 220kV, can choose 3m gaps work
It is foundation), selection abscissa is 3000, obtains its discharge voltage for 1150kV, and selection abscissa is 1000m, obtains its electric discharge
Voltage is 1360kV, can obtain correction factor and be：1360/1150=1.18.
Due to conventional height above sea level 1000m equipment operations impact dielectric level be, it is known that then height above sea level 3000m equipment operations insulation water
It is the product of equipment operation impact dielectric level and correction factor 1.18 at height above sea level 1000m to put down.
Discharge voltage U50 in each figure or discharge voltage 50% in this specification accompanying drawing are represented so that all experimentss
50% surge voltage when discharging in sample.
The invention is not limited in foregoing specific embodiment.The present invention is expanded to and any in this manual disclosed
New feature or any new combination, and disclose any new method or process the step of or any new combination.
Claims (4)
- The acquisition methods of the soft buses of 1.2000m-4000m height above sea level 500kV relatively lightning impulse dielectric level height above sea level correction value, its It is characterised by, including：Step 1：Calculating height above sea level according to formula Ka=(1.633-1.278)/(4000-2000) × (H-2000)+1.278 is Some region of soft bus lightning impulse dielectric level correction factor over the ground between 2000m-4000m；Wherein H is height above sea level, Span is between 2000 meters to 4000 meters；Step 2：Inquire about the soft bus in 0 Altitude Regions lightning impulse dielectric level value over the ground；Step 3：The soft bus in 0 Altitude Regions that step 2 inquires lightning impulse dielectric level over the ground is multiplied by using adjusted coefficient K a Value just obtains the soft bus lightning impulse dielectric level height above sea level correction value over the ground that height above sea level is H.
- 2. method according to claim 1, it is characterised in that further comprising the steps of：Step a1：Devise for high altitude localities relatively lightning impulse voltage Insulation Test model, the model and routine 500kV Substation Electric Equipments ratio is 1：1；Step a2：Real model experiment is simulated in the test model of high altitude localities, soft bus and herringbone tube is obtained Frame clearance criteria thunder impulse discharge characteristics curve and soft bus are to cross-arm clearance criteria thunder impulse discharge characteristics curve；Its Include data below：Table 1Table 2Table 3Table 4
- The acquisition methods of 3.2000m-4000m height above sea level 500kV grading rings relatively lightning impulse dielectric level height above sea level correction value, its It is characterised by, including：Step 1：Calculating height above sea level according to formula Ka=(1.640-1.283)/(4000-2000) × (H-2000)+1.283 is Some region of grading ring lightning impulse dielectric level correction factor over the ground between 2000m-4000m；Wherein H is height above sea level, Span is between 2000 meters to 4000 meters；Step 2：Inquire about 0 Altitude Regions grading ring lightning impulse dielectric level value over the ground；Step 3：0 Altitude Regions grading ring that step 2 inquires lightning impulse dielectric level over the ground is multiplied by using adjusted coefficient K a Value just obtains the grading ring lightning impulse dielectric level height above sea level correction value over the ground that height above sea level is H.
- 4. method according to claim 3, it is characterised in that further comprising the steps of：Step b1：Devise for high altitude localities relatively lightning impulse voltage Insulation Test model, the model and routine 500kV Substation Electric Equipments ratio is 1：1；Step b2：Real model experiment is simulated in the test model of high altitude localities, horizontally disposed grading ring is obtained To herringbone pipe support clearance criteria thunder impulse discharge characteristics curve and grading ring is arranged vertically to herringbone pipe support clearance criteria thunder Surge discharge characteristic curve；Including data below：Table 5Table 6Table 7Table 8
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| CN108562832B (en) * | 2017-12-12 | 2021-03-23 | 云南电网有限责任公司带电作业分公司 | Method for determining overvoltage characteristics of high-altitude line insulators of 35kV and below |
| CN109143138A (en) * | 2018-06-20 | 2019-01-04 | 中国电力科学研究院有限公司 | A kind of modified method of extra-high voltage equipment external insulation withstanding voltage height above sea level |
| CN109358276A (en) * | 2018-11-30 | 2019-02-19 | 国网冀北电力有限公司经济技术研究院 | Air clearance calculation method and device |
| CN113612202B (en) * | 2021-05-31 | 2023-10-03 | 中国电力科学研究院有限公司 | Method and system for selecting high-voltage cable sheath protector |
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