CN103684622B - Medium wave frequency range UHV transmission line steel tower secondary radiation restraining device and method - Google Patents
Medium wave frequency range UHV transmission line steel tower secondary radiation restraining device and method Download PDFInfo
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Abstract
Medium wave frequency range UHV transmission line steel tower secondary radiation restraining device and method, medium wave frequency range UHV transmission line steel tower secondary radiation restraining device, comprise metallic cable, earthing device, one end of metallic cable connects steel tower tower top, the other end and to connect in the position of distance ground certain altitude by parallel component one end that the parallel connection of controllable impedance L, tunable capacitor C, cutting back metallic cable is formed, described parallel component other end connecting earthing device.A kind of medium wave frequency range UHV transmission line steel tower secondary radiation restraining device of the present invention and method, can obviously suppress UHV transmission steel tower to the secondary radiation of radio station, the sourceless seism that can be applicable to from now between medium wave frequency range UHV transmission line and the neighboring radio station protects.
Description
Technical field
A kind of medium wave frequency range UHV transmission line steel tower secondary radiation restraining device of the present invention and method, belong to high-voltage testing room field of electromagnetic compatibility.
Background technology
The generation of sourceless seism is mainly derived from the loop that steel tower and ground wire form, or many bases steel tower self add excitation of electromagnetic wave outside under the secondary radiation that produces.For the situation that line steel tower and ground wire insulate, according to antenna theory, steel tower can be considered independently in medium wave frequency range (0.3 ~ 3MHz), perpendicular to the one pole wire antenna on ground, this wire antenna induces huge induced current under the excitation of medium wave radio signal.The secondary radiation electromagnetic wave that induced current produces superposes with former incident electromagnetic wave, changes amplitude and the phase place of former incident electromagnetic wave, thus produces strong interference to the proximity radio station.Therefore, medium wave frequency range UHV transmission line steel tower must be suppressed the secondary radiation of the proximity radio station.
For the safeguard procedures of sourceless seism, the current work of China concentrates on the national standard formulation aspect of sourceless seism protection distance between extra high voltage line and all kinds of radio station.Between UHV transmission line and radio station, the formulating method of sourceless seism protection distance is comparatively ripe.Chinese patent ZL:200710168958.1 disclosed " between extra-high voltage AC circuit and short-wave radio direction finding station protection distance defining method "; Chinese patent ZL:200710168959.6 disclosed " between extra-high voltage AC circuit and medium wave guidance station protection distance defining method "; And Chinese Patent Application No.: 201110266401.8 disclosed the defining method of protection distance " between extra high voltage direct current transmission line and the wireless station ".All set forth for extra-high voltage AC circuit and the protection distance method for solving closed between the concrete station.But, formulate the relevant criterion of UHV transmission line and proximity radio station sourceless seism protection distance, certain foundation can only be provided for the circuit do not built and station engineering construction, this cannot solve the situation that extra high voltage line cannot detour due to land resource, also cannot solve the electromagnetic interference problem between existing circuit and the station.
Therefore, seeking the effective technology of active suppression UHV transmission line sourceless seism, being very important as only relying on effectively supplementing of the sourceless seism safeguard procedures of protection distance standard.Chinese Patent Application No.: 201110275071.9 disclosed " a kind of reduce the Shipboard Passive of extra-high voltage AC circuit to radio station ", by being set with the size that magnet ring controls sourceless seism on overhead ground wire or shaft tower, namely adopt magnet ring increase the loss of electromagnetic wave energy and weaken the method for Electromagnetic Wave Propagation, reduce sourceless seism level.The magnet ring material characteristic parameter related in this patent is determined comparatively loaded down with trivial details, and can only be similar to setting, and meanwhile, the cost of magnet ring material is high, and the difficulty of construction that magnet ring is installed is large.Special needs to be pointed out is, the magnet ring of this patent requirements circle is enclosed within shaft tower or ground wire, and this method can only be applicable to transmission line and adopt when Poling Construction, cannot be applicable to the circuit after building up.Therefore, be directed to the sourceless seism problem of built circuit to the proximity radio station, a kind of new method and apparatus need be invented targetedly, solve the secondary radiation problem occurred after circuit puts into operation.
Summary of the invention
The present invention is based on the thought suppressing sourceless seism maximum, for the situation that UHV transmission line steel tower and ground wire insulate, the mechanism of secondary radiation is produced from UHV transmission steel tower, provide medium wave frequency range UHV transmission line steel tower secondary radiation restraining device and method, can effectively suppress UHV transmission steel tower to the secondary radiation of the proximity radio station.
The technical scheme that the present invention takes is: medium wave frequency range UHV transmission line steel tower secondary radiation restraining device, comprise metallic cable, earthing device, one end of metallic cable connects steel tower tower top, the other end and to connect in the position of distance ground certain altitude by parallel component one end that the parallel connection of controllable impedance L, tunable capacitor C, cutting back metallic cable is formed, described parallel component other end connecting earthing device.
Connect respectively the first diverter switch K1, the second diverter switch K2, the 3rd diverter switch K3 of described controllable impedance L, tunable capacitor C, cutting back metallic cable forms three branch roads of described parallel component.
The length of described metallic cable equals the height of steel tower and and remains certain distance between steel tower.
Medium wave frequency range UHV transmission line steel tower secondary radiation suppressing method, first the wavelength that the steel tower secondary radiation maximum frequency of 1/4th times is corresponding is determined, the wavelength of the height of steel tower and 1/4th times is contrasted, by diverter switch and the perhaps controllable impedance operation of adjustment adjustable electric, regulate the induced current of UHV transmission steel tower secondary radiation restraining device, thus suppress steel tower to the signal disturbing of neighbouring radio station.
Medium wave frequency range UHV transmission line steel tower secondary radiation suppressing method, comprises the following steps:
Step one: according to the horizontal radio-frequency chart of sourceless seism, determines steel tower secondary radiation maximum frequency, calculates the corresponding electromagnetic wavelength of this frequency;
Step 2: compare the wavelength of 1/4th times and the height of steel tower, when steel tower height is the wavelength of 1/4th times, the 3rd diverter switch K3 is switched to short metallic cable place branch road; When steel tower height is less than the wavelength of 1/4th times, the second diverter switch K2 is switched to tunable capacitor C place branch road; When steel tower height is greater than the wavelength of 1/4th times, the first diverter switch K1 is switched to controllable impedance L place branch road;
Step 3: regulate tunable capacitor C or controllable impedance L, the induced current of UHV transmission steel tower secondary radiation restraining device is regulated, make its induced current equal and opposite in direction with steel tower, phase place contrary, thus amplitude peak ground suppress steel tower to produce sourceless seism to contiguous radio station.
A kind of medium wave frequency range UHV transmission line steel tower secondary radiation restraining device of the present invention and method, can obviously suppress UHV transmission steel tower to the secondary radiation of radio station, the sourceless seism that can be applicable to from now between medium wave frequency range UHV transmission line and the neighboring radio station protects.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described:
Fig. 1 is UHV transmission iron tower structure figure, wherein: L
trepresent the length of side at electric power pylon top, L
brepresent the length of side of electric power pylon column foot.
Fig. 2 is UHV transmission steel tower reduced graph of the present invention, wherein: 2r
trepresent the simplification " equivalent redius " of electric power pylon.
Fig. 3 is for installing the UHV transmission steel tower sourceless seism numerical solution model schematic of restraining device;
Fig. 4 is UHV transmission steel tower sourceless seism numerical solution model schematic of the present invention;
Fig. 5 is the scheme of installation of UHV transmission steel tower secondary radiation restraining device of the present invention;
Fig. 6 is steel tower secondary radiation restraining device induced current schematic equivalent circuit of the present invention.
Fig. 7 is the present invention 3 steel column direction finding experimental arrangement figure.
Embodiment
Medium wave frequency range UHV transmission line steel tower secondary radiation restraining device, comprise metallic cable 1, earthing device 2, metallic cable 1 can use aluminium stranded conductor or copper stranded conductor, but aluminium light weight is inexpensive, electric conductivity is only second to copper, and lower to the requirement of mechanical strength herein, therefore preferably adopts aluminium stranded conductor.One end of aluminium stranded conductor 1 connects steel tower 4 tower top, the other end and to connect in the position of distance ground certain altitude by parallel component one end that the parallel connection of controllable impedance L, tunable capacitor C, cutting back metallic cable 3 is formed, described parallel component other end connecting earthing device 2.Cutting back metallic cable 3 can use copper stranded conductor, but aluminium light weight is inexpensive, and electric conductivity is only second to copper, and lower to the requirement of mechanical strength herein, therefore preferably adopts cutting back aluminium stranded conductor.Earthing device 2 is earthing device of electric power pylon, and the present invention is connected with the earthing device of electric power pylon by aluminium stranded conductor.
Connect respectively the first diverter switch K1, the second diverter switch K2, the 3rd diverter switch K3 of described controllable impedance L, tunable capacitor C, cutting back aluminium stranded conductor 3 forms three branch roads of described parallel component.
The length of described metallic cable 1 equals the height of steel tower 4 and and remains certain distance between steel tower 4.
Medium wave frequency range UHV transmission line steel tower secondary radiation suppressing method, first the wavelength that the steel tower secondary radiation maximum frequency of 1/4th times is corresponding is determined, the wavelength of the height of steel tower and 1/4th times is contrasted, by diverter switch and the perhaps controllable impedance operation of adjustment adjustable electric, regulate the induced current of UHV transmission steel tower secondary radiation restraining device, thus suppress steel tower to the signal disturbing of neighbouring radio station.
Medium wave frequency range UHV transmission line steel tower secondary radiation suppressing method, comprises the following steps:
Step one: according to the horizontal radio-frequency chart of sourceless seism, determines steel tower secondary radiation maximum frequency, calculates the corresponding electromagnetic wavelength of this frequency;
Step 2: compare the wavelength of 1/4th times and the height of steel tower, when steel tower height is the wavelength of 1/4th times, the 3rd diverter switch K3 is switched to cutting back aluminium stranded conductor place branch road; When steel tower height is less than the wavelength of 1/4th times, the second diverter switch K2 is switched to tunable capacitor C place branch road; When steel tower height is greater than the wavelength of 1/4th times, the first diverter switch K1 is switched to controllable impedance L place branch road;
Step 3: regulate tunable capacitor C or controllable impedance L, the induced current of UHV transmission steel tower secondary radiation restraining device is regulated, make its induced current equal and opposite in direction with steel tower 4, phase place contrary, thus amplitude peak ground suppress steel tower 4 to produce sourceless seism to contiguous radio station.
Below in conjunction with embodiment, the present invention is further detailed explanation, but this embodiment should not be construed as limitation of the present invention.
The determination of 1, secondary radiation maximum frequency and correction:
Based on antenna theory, think that secondary radiation maximum depends primarily on the wavelength of Excitation Electromagnetic Wave and the height of steel tower.If effective height that steel tower is vertical earth lead is ha, the distance from active antenna is h, and the field intensity of tested incoming wave transmitting station is ε, then have the electromotive force of induction in vertical conductor (steel tower) to be:
In formula, la is the height of vertical ground metal conductors (steel tower), and λ is wavelength.Theoretical according to half-wave antenna, think that steel tower induced electromotive force has maximum when steel tower height reaches the wavelength of 1/4th times.But simulation and experiment result of calculation shows, when steel tower is not connected with ground wire, the frequency that interference maximum occurs strictly can not be coincide with above-mentioned conclusion, and both exist certain difference.This is that these are different in stimulated emission electromagnetic wave situation with the transmitting antenna carrying out feed from center of antenna because steel tower just produces secondary radiation under plane wave excitation; Also there is coupling in steel tower simultaneously each other, forms repeatedly catadioptric, cause the change of observation station field intensity very complicated to electromagnetic wave.
Therefore, the aerial radiation maximum of the steel tower secondary radiation maximum under this plane electromagnetic wave excitation and inherently emission source should be distinguished to some extent, and the secondary radiation maximum frequency of steel tower needs to be determined by the horizontal radio-frequency chart of sourceless seism at field intensity observation station place.For the ease of calculating, UHV transmission steel tower is reduced to straight line model, as shown in Figure 1.In conjunction with the sourceless seism numerical solution model shown in electromagnetic scattering principle and Fig. 2, set up the improved Electric Field Integral Equation that UHV transmission steel tower straight line model is corresponding, and utilize moment method to solve faradic numerical value, and then obtain the sourceless seism level at field intensity observation station place.
2, steel tower sourceless seism restraining device:
In order to suppress UHV transmission steel tower to the sourceless seism of contiguous wireless station, UHV transmission steel tower secondary radiation restraining device of the present invention, the scope of application of this device is that steel tower and ground wire insulate the situation of isolating.
UHV transmission steel tower secondary radiation restraining device is made up of aluminium stranded conductor, tunable capacitor C, controllable impedance L, cutting back aluminium stranded conductor and earthing device 2.One end of the aluminium stranded conductor of this device connects steel tower 4 tower top, and the other end is connected with earthing device 4 by the mode of controllable impedance L, tunable capacitor C and the parallel connection of cutting back aluminium stranded conductor in the position of distance ground certain altitude.The length of aluminium stranded conductor is identical by the height of steel tower 4, and the distance between aluminium stranded conductor and steel tower 4 remains certain distance.Fig. 5 illustrates UHV transmission steel tower secondary radiation restraining device scheme of installation.By diverter switch and the size regulating tunable capacitor C, controllable impedance L, this device can make the sourceless seism level at field intensity observation station place reach minimum value, avoids UHV transmission steel tower to the sourceless seism of the proximity radio station.
Concrete principle: according to the aforementioned steel tower secondary radiation maximum frequency calculated, the height of wavelength corresponding for this frequency and steel tower is compared, operated by diverter switch and adjustment control capacittance C or controllable impedance L, can regulate the induced current of steel tower sourceless seism restraining device, make its induced current equal and opposite in direction with steel tower, phase place contrary.Now, the electromagnetic amplitude of secondary radiation that UHV transmission steel tower secondary radiation restraining device and steel tower produce is equal, phase place contrary, just cancels out each other, does not have an impact to the signal of the radio station near steel tower.When steel tower height is quarter-wave, switching over, to cutting back aluminium stranded conductor place branch road, greatly can weaken the sourceless seism level at field intensity observation station place; When steel tower height is less than quarter-wave, switch should be switched to tunable capacitor C place branch road; When steel tower height is greater than quarter-wave, switch should be switched to controllable impedance L place branch road.
3, numerical result:
Fig. 6 illustrates the induced current equivalent circuit diagram of UHV transmission steel tower secondary radiation restraining device in computation model and extra-high voltage iron tower.The induced current I of UHV transmission steel tower secondary radiation restraining device and steel tower
senseall very large, but select suitable capacitance or inductance value can make the induced current I of 2-6# and 7-11# line unit
sensephasor and equal 0.
For ± 800 kV extra high voltage direct current transmission line ZP30101 type typical case steel towers, when steel tower height is less than λ/4, switching over is to tunable capacitor C place branch road.When capacitance is less, computing formula according to capacitive reactance: C=1/ (2 π fC), capacitive reactance will be very large, be equivalent to aluminium stranded conductor and steel tower 4 is opened a way, now the induced current of aluminium stranded conductor is very little, and the re-radiated field of generation can not offset with steel tower re-radiated field; When capacitance is larger, capacitive reactance is very little, is equivalent to aluminium stranded conductor and steel tower 4 short circuit, and now the induced current of aluminium stranded conductor is very large and phase place is identical with steel tower 4 induced current phase place, can not offset the object of steel tower re-radiated field equally; When the capacitive reactance that capacitance is corresponding equals the induction reactance of equivalent electric circuit under this frequency, the induced current amplitude of aluminium stranded conductor and steel tower 4 is equal and phase place contrary, and the re-radiated field that now aluminium stranded conductor and steel tower 4 produce is offset just.
4, scale model checking:
According to the scale model that 1/10 dimension scale constitution and implementation example is corresponding, carry out the direction finding experiment of 3 steel columns in column group of battle array.Adopt spontaneous short-wave signal to arrive direction-finder set by Grounding Grids (steel column) and carry out direction finding.Specific embodiments is: make the portable direction-finder set of certain type by oneself, each bearing finding accuracy index is obtained in standard place, then this direction-finder set is placed near vertical earthing conductor, the relative position (distance and bearing angle) of figure signal source, steel column and direction-finder set, at different frequencies, with the incident angle in direction-finder set measuring-signal source, and compared with true bearing angle, calculate the angle measurement error value of different frequency, orientation, distance.By the angle measurement error value of standard of comparison place accuracy index and on-the-spot test, judge the influence degree of vertical earthing conductor to direction-finder set.The choosing of on-the-spot test place follow physical features open smooth, background noise is lower, sourceless seism thing (as village, river, high-grade highway, tall trees woods etc.) active without other, get rid of the impact of other various factorss on short-wave radio direction-finder set, the principles such as easy arrival as far as possible.Select the place that airport, Xinjin is tested as this.Grounding Grids adopts diameter 16cm, is highly the steel column of 8m.
Whole testing ground and test macro layout plan (the direction finding interference of 3 steel columns) are as shown in Figure 7.Direction-finder antenna is arranged on the fixing turntable in place, and FRPA-Fixed Radiation Pattern Antenna is 90 to the angle between direction-finder antenna
0, carry out full frequency band (3 ~ 30MHz) excitation to direction-finder antenna, frequency is interval by 1MHz, tests the direction finding numerical value of each Frequency point.Signal source is placed on distance direction-finder set 50m position, and three 8m vertical conductors are equidistantly placed on distance direction-finder set 40m position according to 40m.Signal source, vertical conductor in column become 90 relative to direction-finder set
0angle.
Emulated data after giving on-the-spot measured data in table 1 and adopting modeling method of the present invention to simplify UHV transmission steel tower.
Table 1: measured data contrasts with emulated data:
Consider actual measurement inevitably by the various factors such as periphery electromagnetic environment and landform, by surveying interference level in comparison sheet 1 and calculating interference level, calculated value with measured result closely, can verify that simplified model and computational methods are believable.Meanwhile, after installing sourceless seism resonance restraining device, the sourceless seism level at field intensity observation station place obviously reduces, and illustrates that this device has obvious inhibition to sourceless seism resonance.
Claims (2)
1. the secondary radiation suppressing method of medium wave frequency range UHV transmission line steel tower secondary radiation restraining device, it is characterized in that, comprise medium wave frequency range UHV transmission line steel tower secondary radiation restraining device, this device comprises metallic cable (1), earthing device (2), it is characterized in that, one end of metallic cable (1) connects steel tower (4) tower top, the other end to connect by controllable impedance (L) in the position of distance ground certain altitude, tunable capacitor (C), parallel component one end that cutting back metallic cable (3) parallel connection is formed, described parallel component other end connecting earthing device (2), connect respectively the first diverter switch (K1), the second diverter switch (K2), the 3rd diverter switch (K3) of described controllable impedance (L), tunable capacitor (C), cutting back metallic cable (3) forms three branch roads of described parallel component, the length of described metallic cable (1) equal steel tower (4) height and and remain certain distance between steel tower (4), metallic cable (1) is aluminium stranded conductor or copper stranded conductor,
First the wavelength that the steel tower secondary radiation maximum frequency of 1/4th times is corresponding is determined, the wavelength of the height of steel tower and 1/4th times is contrasted, by diverter switch and regulate tunable capacitor (C) or controllable impedance (L) operation, regulate the induced current of UHV transmission steel tower secondary radiation restraining device, thus suppress steel tower to the signal disturbing of neighbouring radio station.
2. the secondary radiation suppressing method of medium wave frequency range UHV transmission line steel tower secondary radiation restraining device as claimed in claim 1, is characterized in that comprising the following steps:
Step one: according to the horizontal radio-frequency chart of sourceless seism, determines steel tower secondary radiation maximum frequency, calculates the corresponding electromagnetic wavelength of this frequency;
Step 2: compare the wavelength of 1/4th times and the height of steel tower, when steel tower height is the wavelength of 1/4th times, the 3rd diverter switch (K3) is switched to cutting back metallic cable (3) place branch road; When steel tower height is less than the wavelength of 1/4th times, the second diverter switch (K2) is switched to tunable capacitor (C) place branch road; When steel tower height is greater than the wavelength of 1/4th times, the first diverter switch (K1) is switched to controllable impedance (L) place branch road;
Step 3: regulate tunable capacitor (C) or controllable impedance (L), the induced current of UHV transmission steel tower secondary radiation restraining device is regulated, make its induced current equal and opposite in direction with steel tower (4), phase place contrary, thus amplitude peak ground suppress steel tower (4) to produce sourceless seism to contiguous radio station.
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| CN105262081B (en) * | 2015-06-01 | 2017-11-10 | 三峡大学 | A kind of Forecasting Methodology of UHV transmission line shortwave frequency range sourceless seism resonant frequency |
| CN110932808A (en) * | 2019-10-31 | 2020-03-27 | 国网江苏省电力有限公司南京供电分公司 | Method for adjusting antenna building mode on tower to minimize passive interference |
| CN114884606B (en) * | 2020-11-24 | 2024-04-19 | 三峡大学 | Passive interference level accurate solving method based on scattering mutual coupling effect of transmission tower and base station antenna |
| CN115270447B (en) * | 2022-07-19 | 2023-03-31 | 北京交通大学 | Short-wave ultra-high voltage transmission tower electromagnetic scattering analysis method based on characteristic mode theory |
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| JP5242283B2 (en) * | 2008-08-05 | 2013-07-24 | 株式会社東芝 | Railway vehicle information network equipment |
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| CN102340357A (en) * | 2011-09-16 | 2012-02-01 | 国网电力科学研究院 | Method for reducing passive jamming of ultra high voltage alternating current transmission line to radio station |
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Application publication date: 20140326 Assignee: Yichang Yizhixing Technology Co.,Ltd. Assignor: CHINA THREE GORGES University Contract record no.: X2023980034895 Denomination of invention: Secondary radiation suppression device and method for tower of medium wave frequency band ultra-high voltage transmission lines Granted publication date: 20150805 License type: Common License Record date: 20230426 |
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