CN107317294A - A kind of method and system of the insulation protection of the extra-high voltage half-wave power transmission circuit based on power swing - Google Patents
A kind of method and system of the insulation protection of the extra-high voltage half-wave power transmission circuit based on power swing Download PDFInfo
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- CN107317294A CN107317294A CN201710557451.9A CN201710557451A CN107317294A CN 107317294 A CN107317294 A CN 107317294A CN 201710557451 A CN201710557451 A CN 201710557451A CN 107317294 A CN107317294 A CN 107317294A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G13/00—Installations of lightning conductors; Fastening thereof to supporting structure
- H02G13/60—Detecting; Measuring; Sensing; Testing; Simulating
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G13/00—Installations of lightning conductors; Fastening thereof to supporting structure
- H02G13/80—Discharge by conduction or dissipation, e.g. rods, arresters, spark gaps
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- Testing Relating To Insulation (AREA)
Abstract
The invention discloses a kind of method of the insulation protection of the extra-high voltage half-wave power transmission circuit based on power swing, methods described includes：Determine the air gap limit value of the extra-high voltage half-wavelength transmission line of alternation current；Tested and arranged according to the power-frequency discharge of extra-high voltage list back transmission line, power-frequency sparkover voltage curve of the described single time transmission line of alternation current of extra-high voltage to tower body gap is obtained, it is determined that the discharge voltage of power frequency 50% corresponding with the air gap limit value；According to factor of safety, cooperation coefficient and the power-frequency sparkover voltage, switching impulse sparkover voltage is calculated；Based on the switching impulse sparkover voltage, the arrester mount scheme along the extra-high voltage half-wavelength list back transmission line is determined.The arrester mount scheme along extra-high voltage half-wavelength list back transmission line that the application is proposed, that is, can guarantee that the operation of extra-high voltage half-wavelength list back transmission line, the installation number of arrester, economical rationality can be reduced again, and meet the limit value requirement of switching overvoltage.
Description
Technical field
The present invention relates to transmission line insulator technical field, more particularly, to a kind of extra-high voltage based on power swing
The method and system of the insulation protection of half-wave power transmission circuit.
Background technology
Half-wavelength UHV AC transmission technique (Half Wave-length AC Transmission, HWACT) (abbreviation half-wavelength
Transmission of electricity) refer to the electrical distance of transmission of electricity close to a power frequency half-wave, i.e., about 3000km (50Hz) or 2500km's (60Hz) is super remote
The three-phase alternating current technology of transmission of electricity of distance.Reactive power compensation system device (such as high voltage reactor) is not required to due to half-wave power transmission, is not required to
Centre add switchyard, economy and reliability preferably, can realize that remote synchronous is networked, thus with very strong attraction
Power, some countries have carried out paractical research to half-wavelength technology of transmission of electricity.National energy distribution is uneven, remote, Large Copacity
Power transmission mode it is inevitable.The power frequency half-wavelength model that some Energy Bases are required to load center distance close to half-wave power transmission
Enclose, the alternative that extra-high voltage half-wave power transmission technology can be sent out as these large-capacity powers.
Extra-high voltage half-wave power transmission technology has the advantages that fed distance length without building intermediate switching station, but along the line
Working voltage, power-frequency overvoltage and the switching overvoltage feature on road and overvoltage restriction and traditional UHV transmission skill
Art has significantly different part, and the particularity of half-wave power transmission line steady-state voltage's distribiuting causes circuit to convey power and exceed nature work(
When rate or relatively low power factor, rise occurs along line voltage, and its voltage perunit value is about transimission power and natural work(
The ratio of rate.And then cause that Overvoltage Amplitude in failure process and under the power swing of post-fault system rocking process is high, hold
The continuous time is long, according to traditional extra-high voltage Insulation Coordination method, it is necessary to be limited in overvoltage using substantial amounts of arrester
1.7p.u.。
Accordingly, it would be desirable to a kind of technology, to realize the insulation protection of the extra-high voltage half-wave power transmission circuit based on power swing.
The content of the invention
The invention provides a kind of method of Insulation Coordination of the extra-high voltage half-wave power transmission circuit based on power swing and
System, so that the problem of how the extra-high voltage half-wave power transmission circuit based on power swing carries out insulation protection solved.
In order to solve the above problems, the invention provides a kind of extra-high voltage half-wave power transmission circuit based on power swing
The method of insulation protection, methods described includes：
Determine the air gap limit value of the extra-high voltage half-wavelength transmission line of alternation current；
Tested and arranged according to the power-frequency discharge of extra-high voltage list back transmission line, obtain the ultrahigh voltage alternating current transmission lines pair
The power-frequency sparkover voltage curve in tower body gap, it is determined that the discharge voltage of power frequency 50% corresponding with the air gap limit value；
According to factor of safety, cooperation coefficient and the discharge voltage of the power frequency 50%, switching impulse sparkover voltage is calculated；
Based on the switching impulse sparkover voltage, the arrester along the extra-high voltage half-wavelength list back transmission line is determined
Mount scheme.
Preferably, during the calculating switching impulse sparkover voltage, reference factor includes：
The 50% of maximum wind velocity in nearest 100 years；
The switching impulse sparkover voltage of statistics；
The Multiple level influence in parallel to discharge voltage.
Preferably, the cooperation coefficient, I string spans are that 1.1~1.26, V string spans are 1.27.
Preferably, the factor of safety value is 1.
Preferably, the switching impulse sparkover voltage limit value minimum value scope is in 1.78p.u. to 1.80p.u..
Preferably, the arrester mount scheme determined along the extra-high voltage half-wavelength list back transmission line, including：
The arrester that 80 groups of rated voltages are 900kV is installed.
Based on another aspect of the present invention, there is provided a kind of insulation of the extra-high voltage half-wave power transmission circuit based on power swing
The system of protection, the system includes：
Acquiring unit, the air gap limit value for determining the extra-high voltage half-wavelength transmission line of alternation current；
Determining unit, is arranged for being tested according to the power-frequency discharge of extra-high voltage list back transmission line, obtains the extra-high voltage
Transmission line of alternation current is to the power-frequency sparkover voltage curve in tower body gap, it is determined that power frequency 50% corresponding with the air gap limit value
Discharge voltage；
Computing unit, for according to factor of safety, cooperation coefficient and the discharge voltage of the power frequency 50%, calculating operation punching
Hit discharge voltage；
As a result unit, for based on the switching impulse sparkover voltage, determining that the extra-high voltage half-wavelength list feeds back electric wire
The arrester mount scheme of curb line.
Preferably, the computing unit is when calculating switching impulse sparkover voltage, and reference factor includes：
The 50% of maximum wind velocity in nearest 100 years；
The switching impulse sparkover voltage of statistics；
The Multiple level influence in parallel to discharge voltage.
Preferably, the cooperation coefficient, I string spans are that 1.1~1.26, V string spans are 1.27.
Preferably, the safety coefficient value is 1.
Preferably, the switching impulse sparkover voltage limit value minimum value scope is in 1.78p.u. to 1.80p.u..
Preferably, the arrester mount scheme determined along the extra-high voltage half-wavelength list back transmission line, including：
The arrester that 80 groups of rated voltages are 900kV is installed.
A kind of method of the insulation protection of extra-high voltage half-wave power transmission circuit based on power swing proposed by the present invention, leads to
Cross GB24842-2009《1000kV ultra-high voltage AC input transformation engineering overvoltage and Insulation Coordination》Regulation, determines extra-high voltage half-wave
The air gap under long transmission line of alternation current switching overvoltage.Cloth is tested by the power-frequency discharge to extra-high voltage list back transmission line
Put, power-frequency sparkover voltage curve of the ultrahigh voltage alternating current transmission lines to tower body gap is obtained, it is determined that corresponding with the air gap limit value
The discharge voltage of power frequency 50%.The present invention calculates operation punching according to factor of safety, cooperation coefficient and the discharge voltage of power frequency 50%
Discharge voltage is hit, and based on switching impulse sparkover voltage, determines the arrester along extra-high voltage half-wavelength list back transmission line
Mount scheme.The arrester mount scheme along extra-high voltage half-wavelength list back transmission line that the application is proposed, that is, can guarantee that spy
The operation of high pressure half-wavelength list back transmission line, can reduce the installation number of arrester, economical rationality again, and meets and operated
The limit value requirement of voltage.
Brief description of the drawings
By reference to the following drawings, the illustrative embodiments of the present invention can be more fully understood by：
Fig. 1 is a kind of insulation of extra-high voltage half-wave power transmission circuit based on power swing according to embodiment of the present invention
The method flow diagram of protection；
Fig. 2 is according to a kind of cat-head transmission tower side phase power-frequency discharge of embodiment of the present invention experiment arrangement schematic diagram；
Fig. 3 is power-frequency sparkover voltage curve map of the transmission line of electricity according to embodiment of the present invention to tower body gap；
Fig. 4 is a kind of insulation of extra-high voltage half-wave power transmission circuit based on power swing according to embodiment of the present invention
The system construction drawing of protection.
Embodiment
The illustrative embodiments of the present invention are introduced with reference now to accompanying drawing, however, the present invention can use many different shapes
Formula is implemented, and it is to disclose at large and fully there is provided these embodiments to be not limited to embodiment described herein
The present invention, and fully pass on the scope of the present invention to person of ordinary skill in the field.For showing for being illustrated in the accompanying drawings
Term in example property embodiment is not limitation of the invention.In the accompanying drawings, identical cells/elements are attached using identical
Icon is remembered.
Unless otherwise indicated, term (including scientific and technical terminology) used herein has to person of ordinary skill in the field
It is common to understand implication.Further it will be understood that the term limited with usually used dictionary, is appreciated that and it
The linguistic context of association area has consistent implication, and is not construed as Utopian or excessively formal meaning.
Fig. 1 is a kind of insulation of extra-high voltage half-wave power transmission circuit based on power swing according to embodiment of the present invention
The method flow diagram of cooperation.A kind of extra-high voltage half-wave power transmission circuit based on power swing that embodiment of the present invention is proposed
The method of Insulation Coordination, passes through GB24842-2009《1000kV ultra-high voltage AC input transformation engineering overvoltage and Insulation Coordination》Rule
It is fixed, determine the air gap under the switching overvoltage of extra-high voltage half-wavelength transmission line of alternation current.By feeding back electric wire to extra-high voltage list
The power-frequency discharge experiment arrangement on road, obtains power-frequency sparkover voltage curve of the ultrahigh voltage alternating current transmission lines to tower body gap, it is determined that
The discharge voltage of power frequency 50% corresponding with the air gap limit value.Embodiment of the present invention according to factor of safety, cooperation coefficient and
The discharge voltage of power frequency 50%, calculates switching impulse sparkover voltage, and based on switching impulse sparkover voltage, determine extra-high voltage half-wave
Arrester mount scheme along long list back transmission line.As shown in figure 1, method 100 is since step 101：
Preferably, in step 101：Determine the air gap limit value of extra-high voltage half-wavelength transmission line of alternation current.The application root
According to GB24842-2009《1000kV ultra-high voltage AC input transformation engineering overvoltage and Insulation Coordination》Define extra-high-voltage alternating current defeated
The air gap required value under the air gap under electric line switching overvoltage, specific switching overvoltage is shown in Table 1.Table 1 is
1000KV ultrahigh voltage alternating current transmission lines is under switching overvoltage, for transmission line of electricity height above sea level in 500m, 1000m, 1500m
When, when close a floodgate etc. operation, the air gap required value.
Table 1
Preferably, in step 102：Tested and arranged according to the power-frequency discharge of extra-high voltage list back transmission line, obtain extra-high voltage
Transmission line of alternation current is to the power-frequency sparkover voltage curve in tower body gap, it is determined that power frequency corresponding with the air gap limit value 50% is discharged
Voltage.The UHV AC Test Base of the application determines the power-frequency discharge experiment layout drawing of extra-high voltage list back transmission line,
As shown in Figure 2.The application gives power-frequency sparkover voltage curve of the transmission line wire to tower body gap, as shown in Figure 3.
Fig. 2 is the power-frequency discharge experiment layout drawing of extra-high voltage list back transmission line, typical ultrahigh voltage alternating current transmission lines cat
Head tower uses 1: 1 true type tower head, and wire divides hard wire using 1: 1 simulation.It can produce suspension insulator set under strong wind
Raw angle of wind deflection, angle of wind deflection takes 48 ° during working-frequency voltage test.Wire is selected experiment clearance distance apart from d to tower body.
Fig. 3 is power-frequency sparkover voltage U50% curve map of the transmission line wire to tower body gap.Fig. 3 sets forth sky
Corresponding power-frequency sparkover voltage U50% numerical value when gas gap d is 1.5m, power-frequency sparkover voltage U50% numerical value when d is 2.5m, d is
3.5m power-frequency sparkover voltage U50% numerical value.As shown in figure 3, power-frequency sparkover voltage U50% numerical value meets linear with the air gap d
Relation.
Preferably, in step 103：According to factor of safety, cooperation coefficient and the discharge voltage of power frequency 50%, operation punching is calculated
Hit discharge voltage.The application design conditions that selection considers when calculating switching impulse sparkover voltage include：Most strong wind in 100 years
The 50% of speed, statistical operation impulse sparkover voltage, the Multiple level influence in parallel to switching impulse sparkover voltage.
50% switching impulse sparkover voltage of single the air gap is calculated by formula (1)：
u50.1.r=kskcUs (1)
In formula (1)：
ksFor factor of safety, the application value is 1；
kcFor cooperation coefficient, I string spans are that 1.1~1.26, V string spans are 1.27；
Us is transmission line of electricity switching impulse sparkover voltage, kV；
u50.1.rFor power-frequency sparkover voltage U50%.
The application method 100, the switching impulse sparkover voltage limit value minimum value calculated 1.78p.u.~
Between 1.80p.u., more than the limit value 1.70p.u. of conventional ultrahigh voltage alternating current transmission lines switching impulse sparkover voltage requirement.
Preferably, in step 104：Based on switching impulse sparkover voltage, extra-high voltage half-wavelength list back transmission line edge is determined
The arrester mount scheme of line.The application embodiment determines that the arrester along extra-high voltage half-wavelength list back transmission line is installed
Scheme, including：The arrester that 80 groups of rated voltages are 900kV is installed.Presently filed embodiment, is installed along transmission line of electricity
, can be by discharge voltage control in 1.75p.u. when 80 groups of rated voltages are 900kV arrester, the duration is 3s, therefore
Both system safety operation, and economical rationality are can guarantee that, the limit value requirement of switching impulse sparkover voltage is also met.
Presently filed embodiment, when the arrester that 116 groups of rated voltages are 948kV is installed along transmission pressure, control
Discharge voltage level processed is 1.79p.u., and the duration is about 3s, and arrester can meet voltage tolerance requirement.
Embodiment of the present invention proposes a kind of insulation processing of the extra-high voltage half-wave power transmission circuit based on power swing
Method, because the simulation waveform of extra-high voltage half-wavelength switching overvoltage is similar to the waveform of power-frequency overvoltage, therefore is being carried out absolutely
When edge coordinates, according to the limits value of operating clearance, and the method that switching impulse sparkover voltage carries out insulation processing, with reference to
Power-frequency sparkover voltage curve, determines the size of operating impulse voltage, and according to the result of calculation of operating impulse voltage, along progress
The arrangement of arrester.The arrester arrangement economical rationality of the application embodiment, reduces the cost of insulation protection, meets
The limit value requirement of operating impulse voltage, enables the transmission system carry out safe operation.
Fig. 4 is a kind of insulation of extra-high voltage half-wave power transmission circuit based on power swing according to embodiment of the present invention
The system construction drawing of cooperation.As shown in figure 4, a kind of extra-high voltage half-wave power transmission based on power swing of embodiment of the present invention
The system 400 of the insulation protection of circuit includes：
Acquiring unit 401, the air gap limit value for determining extra-high voltage half-wavelength transmission line of alternation current.
Determining unit 402, is arranged for being tested according to the power-frequency discharge of extra-high voltage list back transmission line, is obtained extra-high voltage and is handed over
Transmission line of electricity is flowed to the power-frequency sparkover voltage curve in tower body gap, the electricity it is determined that power frequency corresponding with the air gap limit value 50% is discharged
Pressure.
Computing unit 403, for according to factor of safety, cooperation coefficient and the discharge voltage of power frequency power frequency 50%, calculating behaviour
Make impulse sparkover voltage.
Preferably, computing unit 403 is when calculating switching impulse sparkover voltage, and reference factor includes：In nearest 100 years most
The 50% of big wind speed；The switching impulse sparkover voltage of statistics；The Multiple level influence in parallel to discharge voltage.
Preferably, cooperation coefficient, I string spans are that 1.1~1.26, V string spans are 1.27.
Preferably, factor of safety value is 1.
Preferably, switching impulse sparkover voltage limit value minimum value scope is in 1.78p.u. to 1.80p.u..
As a result unit 404, for based on switching impulse sparkover voltage, determining along extra-high voltage half-wavelength list back transmission line
Arrester mount scheme.Embodiment of the present invention, determines that the arrester along extra-high voltage half-wavelength list back transmission line is installed
Scheme, including：The arrester that 80 groups of rated voltages are 900kV is installed.
The Insulation Coordination of extra-high voltage half-wave power transmission circuit based on power swing of embodiment of the present invention a kind of is
System 400 and a kind of method of the Insulation Coordination of extra-high voltage half-wave power transmission circuit based on power swing of embodiment of the present invention
100 is corresponding, is no longer repeated herein.
The present invention is described by reference to a small amount of embodiment.However, it is known in those skilled in the art, as
What subsidiary Patent right requirement was limited, except the present invention other embodiments disclosed above equally fall the present invention's
In the range of.
Normally, all terms used in the claims are all solved according to them in the usual implication of technical field
Release, unless clearly defined in addition wherein.All references " one/described/be somebody's turn to do [device, component etc.] " are all opened ground
At least one example in described device, component etc. is construed to, unless otherwise expressly specified.Any method disclosed herein
Step need not all be run with disclosed accurate order, unless explicitly stated otherwise.
Claims (12)
1. a kind of method of the insulation protection of the extra-high voltage half-wave power transmission circuit based on power swing, methods described includes：
Determine the air gap limit value of the extra-high voltage half-wavelength transmission line of alternation current；
Tested and arranged according to the power-frequency discharge of extra-high voltage list back transmission line, obtain the ultrahigh voltage alternating current transmission lines to tower body
The power-frequency sparkover voltage curve in gap, it is determined that the discharge voltage of power frequency 50% corresponding with the air gap limit value；
According to factor of safety, cooperation coefficient and the discharge voltage of the power frequency 50%, switching impulse sparkover voltage is calculated；
Based on the switching impulse sparkover voltage, determine that the arrester along the extra-high voltage half-wavelength list back transmission line is installed
Scheme.
2. according to the method described in claim 1, during the calculating switching impulse sparkover voltage, reference factor includes：
The 50% of maximum wind velocity in nearest 100 years；
The switching impulse sparkover voltage of statistics；
The Multiple level influence in parallel to discharge voltage.
3. according to the method described in claim 1, the cooperation coefficient, I string spans are 1.1~1.26, V string spans
For 1.27.
4. according to the method described in claim 1, the factor of safety value is 1.
5. according to the method described in claim 1, the switching impulse sparkover voltage limit value minimum value scope in 1.78p.u. extremely
1.80p.u.。
6. it is according to the method described in claim 1, lightning-arrest along the determination extra-high voltage half-wavelength list back transmission line
Device mount scheme, including：
The arrester that 80 groups of rated voltages are 900kV is installed.
7. a kind of system of the insulation protection of the extra-high voltage half-wave power transmission circuit based on power swing, the system includes：
Acquiring unit, the air gap limit value for determining the extra-high voltage half-wavelength transmission line of alternation current；
Determining unit, is arranged for being tested according to the power-frequency discharge of extra-high voltage list back transmission line, obtains the extra-high-voltage alternating current
Transmission line of electricity is to the power-frequency sparkover voltage curve in tower body gap, it is determined that power frequency 50% corresponding with the air gap limit value is discharged
Voltage；
Computing unit, puts for according to factor of safety, cooperation coefficient and the discharge voltage of the power frequency 50%, calculating switching impulse
Piezoelectric voltage；
As a result unit, for based on the switching impulse sparkover voltage, determining the extra-high voltage half-wavelength list back transmission line edge
The arrester mount scheme of line.
8. system according to claim 7, the computing unit is when calculating switching impulse sparkover voltage, reference factor bag
Include：
The 50% of maximum wind velocity in nearest 100 years；
The switching impulse sparkover voltage of statistics；
The Multiple level influence in parallel to discharge voltage.
9. system according to claim 7, the cooperation coefficient, I string spans are 1.1~1.26, V string spans
For 1.27.
10. system according to claim 7, the safety coefficient value is 1.
11. system according to claim 7, the switching impulse sparkover voltage limit value minimum value scope in 1.78p.u. extremely
1.80p.u.。
12. it is lightning-arrest along system according to claim 7, the determination extra-high voltage half-wavelength list back transmission line
Device mount scheme, including：
The arrester that 80 groups of rated voltages are 900kV is installed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710557451.9A CN107317294B (en) | 2017-07-10 | 2017-07-10 | Method and system for insulation protection of extra-high voltage half-wavelength power transmission line based on power fluctuation |
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| CN201710557451.9A CN107317294B (en) | 2017-07-10 | 2017-07-10 | Method and system for insulation protection of extra-high voltage half-wavelength power transmission line based on power fluctuation |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108963946A (en) * | 2018-06-25 | 2018-12-07 | 国网湖南省电力有限公司 | A kind of transmission line of electricity lightning protection and anti-icing equipment design method |
| CN109031062A (en) * | 2018-07-16 | 2018-12-18 | 中国南方电网有限责任公司超高压输电公司大理局 | Method and system for calculating 50% discharge voltage under tower gap operation impulse voltage |
| CN109031043A (en) * | 2018-07-24 | 2018-12-18 | 国网山西省电力公司电力科学研究院 | Based on instantaneous power Sudden Changing Rate half-wavelength transmission line of alternation current fault phase-selecting method |
| CN110718859A (en) * | 2019-10-16 | 2020-01-21 | 国网电力科学研究院武汉南瑞有限责任公司 | Method for selecting series gap of line lightning arresters in direct-current transmission system |
| CN111969544A (en) * | 2020-09-11 | 2020-11-20 | 云南电网有限责任公司带电作业分公司 | Method for installing zinc oxide lightning arrester on 220kV same-tower multi-circuit line in high-altitude area in electrified mode |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108963946A (en) * | 2018-06-25 | 2018-12-07 | 国网湖南省电力有限公司 | A kind of transmission line of electricity lightning protection and anti-icing equipment design method |
| CN109031062A (en) * | 2018-07-16 | 2018-12-18 | 中国南方电网有限责任公司超高压输电公司大理局 | Method and system for calculating 50% discharge voltage under tower gap operation impulse voltage |
| CN109031062B (en) * | 2018-07-16 | 2021-02-09 | 中国南方电网有限责任公司超高压输电公司大理局 | Method and system for calculating 50% discharge voltage under tower gap operation impulse voltage |
| CN109031043A (en) * | 2018-07-24 | 2018-12-18 | 国网山西省电力公司电力科学研究院 | Based on instantaneous power Sudden Changing Rate half-wavelength transmission line of alternation current fault phase-selecting method |
| CN110718859A (en) * | 2019-10-16 | 2020-01-21 | 国网电力科学研究院武汉南瑞有限责任公司 | Method for selecting series gap of line lightning arresters in direct-current transmission system |
| CN111969544A (en) * | 2020-09-11 | 2020-11-20 | 云南电网有限责任公司带电作业分公司 | Method for installing zinc oxide lightning arrester on 220kV same-tower multi-circuit line in high-altitude area in electrified mode |
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|---|---|
| CN107317294B (en) | 2020-10-30 |
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