CN109143138A - A kind of modified method of extra-high voltage equipment external insulation withstanding voltage height above sea level - Google Patents
A kind of modified method of extra-high voltage equipment external insulation withstanding voltage height above sea level Download PDFInfo
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- CN109143138A CN109143138A CN201810635541.XA CN201810635541A CN109143138A CN 109143138 A CN109143138 A CN 109143138A CN 201810635541 A CN201810635541 A CN 201810635541A CN 109143138 A CN109143138 A CN 109143138A
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- voltage
- external insulation
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- sea level
- height above
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
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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
Abstract
The invention discloses a kind of modified methods of extra-high voltage equipment external insulation withstanding voltage height above sea level, belong to high-voltage insulation technique field.It specifically includes: step 1, obtain factor of safety ks, cooperation coefficient kc, operating impulse voltage cooperation coefficient ksc and representative overvoltage Urp needed for calculating extra-high voltage equipment external insulation withstanding voltage required value, the withstanding voltage Uw of different type applied voltage is determined according to ks, kc, ksc and Urp, and by Uw as the modified reference voltage of height above sea level；Step 2 carries out the modified height above sea level of external insulation withstanding voltage as needed, calculates altitude correction factor Ka, and step 3 calculates the external insulation withstanding voltage required value U of the target extra-high voltage equipment1, step 4, according to U1Determine the revised external insulation rated withstand voltage of target extra-high voltage equipment.Present invention reduces the external insulation of High aititude extra-high voltage equipment level, manufacture difficulty, cost, transport difficulty and occupied areas etc., improve the economy and practicability of UHV transmission technology.
Description
Technical field
The present invention relates to high-voltage insulation technique fields, and relate more specifically to a kind of extra-high voltage equipment external insulation tolerance
The modified method of voltage height above sea level.
Background technique
It with the raising of voltage class, insulate more and more important to the importance of electrical equipment, economy is also more prominent.
Extra-high voltage is the highest engineering of voltage class in current operation, the dielectric level of AC extra high voltage equipment to device fabrication, cost,
Transport etc. has a direct impact.Insulating Design should be while guaranteeing extra-high voltage equipment safe operation, rational dielectric level.
Height above sea level is higher, and air is thinner, and compared with low altitude area, discharge voltage is reduced, and the voltage of same dielectric tolerance is more
It is low, therefore need to improve the external insulation withstanding voltage of equipment in high altitude localities, i.e. external insulation is horizontal.China's standard GB/T/Z
24842-2009 " 1000kV ultra-high voltage AC input transformation engineering overvoltage and Insulation Coordination " (hereinafter referred to as " national standard ") is to spy
The height above sea level amendment of high-tension apparatus external insulation withstanding voltage (external insulation is horizontal) provides calculation basis, when height above sea level H is more than
When 1000m, the specified external insulation withstanding voltage value of equipment provided using the altitude correction factor ka that formula (1) calculates to standard is carried out
Correction.
K in formulamFor voltage cooperation coefficient, value is as follows: lightning impulse voltage km=1.0；Operating impulse voltage kmFig. 1 choosing
It takes；The power-frequency voltage k in short-term of the air gap and clean insulatorm=1.0.
Specific practice is: if the external insulation rated withstand voltage of equipment is U when height above sea level is 1000m, being higher than 1000m
Equipment external insulation withstanding voltage required value be U1=ka × U；
Then rated withstand voltage of the value as equipment close to and above U1 is chosen in standard toleragenic standard voltage value
Um, i.e. dielectric level.For example, in national standard GB 311.1-2012, the specified power frequency withstanding voltage preferred value in short-term of equipment
(virtual value, kV) is as follows:
This altitude correcting method is repaired on the basis of the external insulation rated withstand voltage U of height above sea level 1000m equipment
Just, certain engineerings be will lead in this way, excessive demand is proposed to the external insulation of equipment.The reason is as follows that:
The external insulation rated power frequency withstand voltage U of height above sea level 1000m equipment is the power frequency withstanding voltage requirement in equipment
Value (the height above sea level amendment comprising height above sea level 1000m) U0On the basis of, level-one or second level are abutted up in above-mentioned preferred value
It chooses.Therefore, it when height above sea level is modified higher than 1000m, is also carried out using the difference (U-U0) when formula (1) between the two
Height above sea level amendment, it is higher that the raising of this portion voltage causes external insulation.It is described as follows by taking power frequency withstanding voltage as an example:
National regulations height above sea level 1000m and equipment rated power frequency withstand voltage below are 1100kV, it is now assumed that equipment is located at
The area height above sea level 2000m carries out height above sea level amendment, ka=1.131, U1=1100 × 1.131=1244kV, abut up level-one select it is specified
Power frequency withstanding voltage is 1300kV.
This method can make correction result bigger than normal, cause high altitude localities equipment outer insulation withstanding voltage value excessively high.At present
In national standard, the height above sea level amendment a reference value of extra-high voltage equipment external insulation level is the rated withstand voltage of height above sea level 1000m equipment
For U, contains 1000m height above sea level and correct and select close standard series insulation withstanding voltage upwards.A reference value U is bigger than normal, no
It is horizontal conducive to the external insulation for reducing high altitude localities extra-high voltage equipment.
Summary of the invention
It is an object of the invention to reduce the external insulation of High aititude extra-high voltage equipment level, the system of High aititude extra-high voltage equipment
The transport difficulty, cost and occupied area of difficulty and cost and large scale extra-high voltage equipment are made, UHV transmission technology is improved
Economy, practicability, propose a kind of modified method of extra-high voltage equipment external insulation withstanding voltage height above sea level.
Technical solution of the present invention includes:
Step 1 obtains factor of safety ks needed for calculating extra-high voltage equipment external insulation withstanding voltage required value, matches collaboration
Number kc, operating impulse voltage cooperation coefficient ksc and representative overvoltage Urp, determine withstanding voltage according to ks, kc, ksc and Urp
Uw, and by Uw as reference voltage；
Step 2 carries out the modified height above sea level of external insulation withstanding voltage as needed, calculates altitude correction factor Ka, meter
Calculating formula is
Wherein ka is correction factor, and km is the voltage cooperation coefficient of extra-high voltage equipment, and H is height above sea level；
Step 3 calculates the external insulation withstanding voltage required value U of the target extra-high voltage equipment1, calculation formula is
U1=ka×Uw； (2)
Step 4, according to U1Determine the revised external insulation rated withstand voltage of target extra-high voltage equipment.
Preferably, voltage unit kV.
Preferably, value of the Urp under power-frequency voltage, lightning impulse voltage and operating impulse voltage is different.
Preferably, Uw is respectively power frequency electric in the calculation formula of power-frequency voltage, lightning impulse voltage and operating impulse voltage
Press Uw=kskcUrp, lightning impulse voltage Uw=ksUrp, operating impulse voltage Uw=kskscUrp.
Preferably, power-frequency voltage altitude correction factor ka=is calculated according to formula 1 in height above sea level 1500m
1.202, extra-high voltage equipment external insulation withstanding voltage required value U is calculated according to formula 21=1193kV, outside series standard
U is selected above in insulation withstanding voltage1And close 1200kV is as revised external insulation withstanding voltage.
Preferably, power-frequency voltage altitude correction factor ka=is calculated according to formula 1 in height above sea level 2000m
1.278, extra-high voltage equipment external insulation withstanding voltage required value U is calculated according to formula 21=1269kV, outside series standard
U is selected above in insulation power frequency withstanding voltage1And close 1300kV is as revised external insulation rated withstand voltage.
Preferably, power-frequency voltage altitude correction factor ka=is calculated according to formula 1 in height above sea level 2500m
1.359, extra-high voltage equipment external insulation withstanding voltage required value U is calculated according to formula 21=1349kV, outside series standard
U is selected above in insulation withstanding voltage1And close 1400kV is as revised external insulation rated withstand voltage.
The present invention has the advantages that
The present invention is modified the external insulation withstanding voltage of High aititude extra-high voltage equipment, can reduce High aititude extra-high voltage and set
Standby external insulation is horizontal, reduces the manufacture difficulty of equipment, keeps equipment easily fabricated while saving equipment cost.
The external insulation that the present invention reduces High aititude extra-high voltage equipment is horizontal, reduces the outer dimension of equipment, reduces and set
Standby transport difficulty and cost, reduces the occupied area of equipment.
The present invention carries out height above sea level amendment in the height of height above sea level 0m, therefore in calculation formula, height above sea level is no longer subtracted
1000m.So more simply, it is easier to understand.
The present invention has important application value for the economy and reliability that improve UHV transmission, especially for place
Extra-high voltage project in high altitude localities.
Detailed description of the invention
Fig. 1 is a kind of modified method flow diagram of extra-high voltage equipment external insulation withstanding voltage height above sea level of the invention；
Fig. 2 is a kind of modified method of extra-high voltage equipment external insulation withstanding voltage height above sea level of the invention in kmValue range figure；
Wherein a relatively insulate b minor insulation c phase insulation d rod plain gap (standard clearance).
Specific embodiment
Exemplary embodiments of the present invention are introduced referring now to the drawings, however, the present invention can use many different shapes
Formula is implemented, and is not limited to the embodiment described herein, and to provide these embodiments be at large and fully disclose
The present invention, and the scope of the present invention is sufficiently conveyed to person of ordinary skill in the field.Show for what is be illustrated in the accompanying drawings
Term in example property embodiment is not limitation of the invention.In the accompanying drawings, identical cells/elements use identical attached
Icon note.
Unless otherwise indicated, term (including scientific and technical terminology) used herein has person of ordinary skill in the field
It is common to understand meaning.Further it will be understood that with the term that usually used dictionary limits, should be understood as and its
The context of related fields has consistent meaning, and is not construed as Utopian or too formal meaning.
Fig. 1 is a kind of modified method flow diagram of extra-high voltage equipment external insulation withstanding voltage height above sea level of the invention, and Fig. 2 is this hair
A kind of modified method of bright extra-high voltage equipment external insulation withstanding voltage height above sea level is in kmValue range figure.With reference to the accompanying drawing with height above sea level
1500m, 2000m and 2500m are illustrated as embodiment.
The present invention provides a kind of extra-high voltage equipment external insulation withstanding voltage height above sea level modified method, for High aititude extra-high voltage
Engineering, overvoltage level or protection of arrester based on equipment are horizontal, are resistant to electricity to the requirement in extra-high voltage equipment Insulation Coordination
Pressure carries out height above sea level amendment, after obtaining external insulation withstanding voltage required value, then selects from the standard series of dielectric level specified resistance to
By voltage value.
Embodiment 1
It is illustrated for 1500 meters of height above sea level；
As shown in Figure 1, step 1, obtain the factor of safety ks of extra-high voltage equipment external insulation withstanding voltage, cooperation coefficient kc,
Operating impulse voltage cooperation coefficient ksc and representative overvoltage Urp, wherein Urp is in power-frequency voltage, lightning impulse voltage and operation
Value under surge voltage is different, withstanding voltage Uw=kskcUrp under power-frequency voltage, wherein factor of safety ks=1.05, cooperation
Coefficient k c=1, representative overvoltage Urp=889kV obtain Uw=889 × 1 × 1.05=993kV, and by Uw as benchmark electricity
Pressure；
Step 2, the height above sea level of target extra-high voltage equipment are 1500 meters；It is modified based on 0 meter of height above sea level,
Altitude correction factor Ka is calculated, according to formula
The voltage cooperation coefficient km of extra-high voltage equipment selects a relatively to insulate and the km value of Uw=993kV as shown in Figure 2,
H=1500 meters of height above sea level, obtain ka=1.202；
Step 3 calculates the external insulation withstanding voltage required value U of the target extra-high voltage equipment1,
U1=ka×Uw；
Obtain U1=1.202 × 993=1193kV；
Step 4, according to U1The revised external insulation withstanding voltage for determining target extra-high voltage equipment is 1200kV.
Embodiment 2
As shown in Figure 1, being illustrated for 2000 meters of height above sea level；
Step 1 obtains factor of safety ks, cooperation coefficient kc, the switching impulse electricity of extra-high voltage equipment external insulation withstanding voltage
Press-fit coefficient k sc and representative overvoltage Urp, withstanding voltage Uw=kskcUrp under power-frequency voltage, wherein factor of safety ks=
1.05, cooperation coefficient kc=1, representative overvoltage Urp=889kV, obtain Uw=889 × 1 × 1.05=993kV, and by Uw
As reference voltage；
Step 2, the height above sea level of target extra-high voltage equipment are 2000 meters；It is modified based on 0 meter of height above sea level,
Altitude correction factor Ka is calculated, according to formula
The voltage cooperation coefficient km of extra-high voltage equipment selects a relatively to insulate and the km value of Uw=993kV as shown in Figure 2,
H=2000 meters of height above sea level, obtain ka=1.278；
Step 3 calculates the external insulation withstanding voltage required value U of the target extra-high voltage equipment1,
U1=ka×Uw；
Obtain U1=1.278 × 993=1269kV；
Step 4, according to U1The revised external insulation withstanding voltage for determining target extra-high voltage equipment is 1300kV.
Embodiment 3
As shown in Figure 1, being illustrated for 2500 meters of height above sea level；
Step 1 obtains factor of safety ks, cooperation coefficient kc, the switching impulse electricity of extra-high voltage equipment external insulation withstanding voltage
Press-fit coefficient k sc and representative overvoltage Urp, withstanding voltage Uw=kskcUrp under power-frequency voltage, wherein factor of safety ks=
1.05, cooperation coefficient kc=1, representative overvoltage Urp=889kV, obtain Uw=889 × 1 × 1.05=993kV, and by Uw
As reference voltage；
Step 2, the height above sea level of target extra-high voltage equipment are 2500 meters, are modified based on 0 meter of height above sea level,
Altitude correction factor Ka is calculated, according to formula
The voltage cooperation coefficient km of extra-high voltage equipment selects a relatively to insulate and the km value of Uw=993kV as shown in Figure 2,
H=2500 meters of height above sea level, obtain ka=1.359；
Step 3 calculates the external insulation withstanding voltage required value U of the target extra-high voltage equipment1,
U1=ka×Uw；
Obtain U1=1.359 × 993=1349kV；
Step 4, according to U1The revised external insulation withstanding voltage for determining target extra-high voltage equipment is 1400kV.
The present invention is modified the external insulation withstanding voltage of High aititude extra-high voltage equipment, can reduce High aititude extra-high voltage and set
Standby external insulation is horizontal, reduces the manufacture difficulty of equipment, keeps equipment easily fabricated while saving equipment cost.
The external insulation that the present invention reduces High aititude extra-high voltage equipment is horizontal, reduces the outer dimension of equipment, reduces and set
Standby transport difficulty and cost, reduces the occupied area of equipment.
The present invention carries out height above sea level amendment in the height of height above sea level 0m, therefore in calculation formula, height above sea level is no longer subtracted
1000m.So more simply, it is easier to understand.
Claims (7)
1. a kind of modified method of extra-high voltage equipment external insulation withstanding voltage height above sea level characterized by comprising
Step 1, obtain calculate extra-high voltage equipment external insulation withstanding voltage required value needed for factor of safety ks, cooperation coefficient kc,
Operating impulse voltage cooperation coefficient ksc and representative overvoltage Urp determines that different type makees electricity consumption according to ks, kc, ksc and Urp
The withstanding voltage Uw of pressure, and by Uw as reference voltage；
Step 2 carries out the modified height above sea level of external insulation withstanding voltage as needed, calculates altitude correction factor Ka, calculates public
Formula is
Wherein ka is correction factor, and km is the voltage cooperation coefficient of extra-high voltage equipment, and H is height above sea level；
Step 3 calculates the external insulation withstanding voltage required value U of the target extra-high voltage equipment1, calculation formula is
U1=ka×Uw； (2)
Step 4, according to U1Determine the revised external insulation rated withstand voltage of target extra-high voltage equipment.
2. according to the method described in claim 1, it is characterized by: the voltage unit is kV.
3. according to the method described in claim 1, it is characterized by: the Uw is in power-frequency voltage, lightning impulse voltage and operation
The calculation formula of surge voltage is respectively power-frequency voltage Uw=kskcUrp, lightning impulse voltage Uw=ksUrp, switching impulse electricity
Press Uw=kskscUrp.
4. according to the method described in claim 1, it is characterized by: the Urp is in power-frequency voltage, lightning impulse voltage and operation
Value under surge voltage is different.
5. according to the method described in claim 1, it is characterized by: height above sea level be 1500m, work is calculated according to formula 1
Extra-high voltage equipment external insulation withstanding voltage required value U is calculated according to formula 2 in frequency voltage altitude correction factor ka=1.2021
=1193kV is selected above U in series standard external insulation withstanding voltage1And close 1200kV is as revised external insulation
Rated withstand voltage.
6. according to the method described in claim 1, it is characterized by: height above sea level be 2000m, work is calculated according to formula 1
Extra-high voltage equipment external insulation withstanding voltage required value U is calculated according to formula 2 in frequency voltage altitude correction factor ka=1.2781
=1269kV is selected above U in series standard external insulation withstanding voltage1And close 1300kV is as revised external insulation
Rated withstand voltage.
7. according to the method described in claim 1, it is characterized by: height above sea level be 2500m, work is calculated according to formula 1
Extra-high voltage equipment external insulation withstanding voltage required value U is calculated according to formula 2 in frequency voltage altitude correction factor ka=1.3591
=1349kV is selected above U in series standard external insulation withstanding voltage1And close 1400kV is as revised external insulation
Rated withstand voltage.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112802687A (en) * | 2020-12-30 | 2021-05-14 | 中铁第一勘察设计院集团有限公司 | High-altitude power capacitor device |
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