CN1912638B - Can type capacitor voltage mutual inductor - Google Patents
Can type capacitor voltage mutual inductor Download PDFInfo
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- CN1912638B CN1912638B CN2006100200037A CN200610020003A CN1912638B CN 1912638 B CN1912638 B CN 1912638B CN 2006100200037 A CN2006100200037 A CN 2006100200037A CN 200610020003 A CN200610020003 A CN 200610020003A CN 1912638 B CN1912638 B CN 1912638B
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- 239000003990 capacitor Substances 0.000 title claims description 42
- 238000009413 insulation Methods 0.000 claims description 30
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- 239000002184 metal Substances 0.000 claims description 8
- 239000004020 conductor Substances 0.000 claims description 7
- 238000004804 winding Methods 0.000 claims description 5
- 239000012212 insulator Substances 0.000 claims description 4
- 238000002955 isolation Methods 0.000 claims description 3
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- 239000002131 composite material Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
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- 235000007466 Corylus avellana Nutrition 0.000 description 2
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- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 229910052573 porcelain Inorganic materials 0.000 description 2
- 230000002277 temperature effect Effects 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
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- 238000002485 combustion reaction Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
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- 230000001131 transforming effect Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
- H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
- H02B13/035—Gas-insulated switchgear
- H02B13/0356—Mounting of monitoring devices, e.g. current transformers
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Abstract
A voltage mutual inductor of tank capacity type consists of sealed tank body, high voltage electrode, medium voltage electrode, sleeve of outgoing wire and electromagnetic unit. It is featured as forming high voltage arm capacity C1 by cylindrical surfaces between high voltage and medium voltage electrodes, forming medium voltage arm capacity C2 by cylindrical surfaces between medium voltage electrode and sealed tank body, using two said arm capacities C1 and C2 to form capacity voltage divider.
Description
Technical field
The invention belongs to power transmission and transforming equipment High-Voltage Electrical Appliances field; relate to a kind of high-voltage capacitance formula voltage transformer (VT); relate in particular to can type capacitor voltage mutual inductor (being called for short pot type CVT); it is applicable to electric energy metrical, relay protection and electric quantity monitoring in the gas insulated transformer substation (hereinafter to be referred as GIS) of 1000kV electric pressure electrical network, also extensible 750kV, 500kV and the low-voltage grade electrical network more of using.
Background technology
At present, widely used voltage transformer (VT) is electromagnetic potential transformer (hereinafter to be referred as VT) among the GIS.Along with the raising of electric pressure, the manufacture difficulty of VT, technology, cost, volume, weight can be multiplied, and insulation characterisitic is also very bad, particularly VT easily and electrical network generation ferroresonance, it tolerates the ability of lightning impulse voltage and switching overvoltage.According to the knowledge of the applicant, the GIS of only in the world 1000kV electric pressure is the new hazel name 1000kV AC extra high voltage transformer station of Japan at present, that adopt is electronic type voltage transformer (hereinafter to be referred as EVT), but, its ruuning situation shows, by Japan three famous power equipment manufacturing companies of family is that the 1000kV GIS of new hazel name 1000kV AC extra high voltage transformer station development uses EVT there are the following problems: the error characteristics poor stability, variation is big, the superpotential ability is transmitted in tolerance, wherein having the model machine of two families not reach designing requirement, is just to have damaged in the long-term charged examination process in dry run; Even the product of a company that performance is best, its error characteristics are also far short of what is expected than traditional VT, stability is bad.EVT compares with VT, high-voltage capacitance formula voltage transformer (VT) (being called for short CVT), and poor reliability, the bad shortcoming of error characteristics thoroughly do not solve so far.Also do not have the VT prototype design of 1000kV to come out in the world from the present, Japanese 1000kV extra-high voltage GIS selects for use EVT also to be because the development difficulty cause of VT, and the EVT class of accuracy of the 1000kV of Japan only reaches 1 grade of level.
In addition, traditional CVT is a pole structure, bears high-tension capacitive divider and is made up of multistage capacitor cell (the being capacitor body) stack that is installed in the porcelain bushing shell.Pole structure CVT mainly is used for open type transformer station (being called for short AIS) separately, and its capacitive divider mainly contains two kinds of insulation systems: a kind of is the oil immersed type capacitive divider of paper oil insulation structure, also is referred to as the manifold type capacitor; Another kind is that the organic insulation medium mostly is mylar and SF
6The capacitive divider that gas-insulated is composited.Paper oil insulation structure, mylar SF
6The gas-insulated composite structure all is unsuitable for use among GIS, and the paper oil insulation structure is that a series of little oil immersed type capacitors in series form mylar SF
6The gas-insulated composite structure is that mylar and the coiling of tinfoil paper (electrode) coaxial circles form.The composite structure of two kinds of different dielectric coefficient materials can not show a candle to single insulation restorability SF
6Gas-insulated.
If in GIS, pack the oil immersed type capacitor into, Electric Field Distribution inequality not only, and because the cause of insulating oil, the sealing at different medium interface and electric field are difficult for handling, and pollute the GIS tank body easily, can not make full use of SF
6Gas can only be at uniform electric field or the good characteristic that uses in the non-uniform electric field slightly.Oilpaper, SF
6The dielectric coefficient difference of gas, near the electric field intensity the two media that distorts easily so just can not be brought into play SF
6The effect of gas.Another defective of oil immersed type CVT is the potential danger that explosive combustion is arranged.Mylar SF
6Gas-insulated composite structure CVT, bearing high-tension capacitive divider major insulation is organic insulation, is exactly nonvolatil in case insulation harm occurs, its insulating property cannot be recovered again.
Capacitive divider complex structure, the manufacture craft difficulty of tradition pillar CVT are big, and capacitive divider is in series by up to a hundred or hundreds of capacitor units; It is bigger that pillar CVT is influenced by high-voltage connection, adjacent object and adjacent phase power supply, and environment temperature and thermograde, porcelain bushing shell surface filth degree and relative humidity are also influential to error characteristics.High-voltage connection, temperature variation various factors such as (the temperature ladder are poor up and down to comprise the column type capacitor voltage divider) reach 0.3% to the error effect amount of 765kV electric pressure pillar CVT, and the synthetic amount of influence is bigger.
Summary of the invention
The objective of the invention is, defective at prior art is improved, a kind of pot type CVT with brand-new design notion is provided, and mainly is to solve extra-high voltage, UHV (ultra-high voltage) and high pressure GIS to be short of, to have and difficult problems such as the danger of electrical network generation ferroresonance and manufacturing process difficulty with the insulating property that a winding transient overvoltage of voltage transformer (VT) skewness causes.
Technical solution of the present invention is, a kind of pot type CVT is made up of sealed shell of tank, high-field electrode, the middle piezoelectricity utmost point, outlet sleeve pipe and electromagnetic unit, and high-field electrode, the middle piezoelectricity utmost point are in sealed shell of tank, and sealed shell of tank adopts SF
6Gas-insulated pot type structure, electromagnetic unit is plug-in, it is characterized in that: sealed shell of tank 1, high-field electrode 2 and in the piezoelectricity utmost point 3 be the coaxial cylindrical structure, and high-field electrode 2 at innermost layer, the middle piezoelectricity utmost point 3 between sealed shell of tank 1 and high-field electrode 2; Form the high-voltage arm capacitor C between high-field electrode 2 and the middle piezoelectricity utmost point 3 cylinders
1, the middle piezoelectricity utmost point 3 and sealed shell of tank 1 are pressure arm capacitor C in forming between the earth potential electrode cylinder
2, the high-voltage arm capacitor C
1With middle pressure arm capacitor C
2Constitute capacitive divider, middle pressure arm capacitor C
2Can be one or a plurality of combination, the adjustment of above-mentioned electrode length, the number of plies and interelectrode distance can change the intrinsic standoff ratio of capacitive divider; In the extension line of the piezoelectricity utmost point 3 little resistance induction reactance 6 backs of connecting be connected with electromagnetic unit 5, little resistance induction reactance 6 is installed in the outlet sleeve pipe 4.
It is characterized in that: little resistance induction reactance 6 presents low impedance value under power frequency 50Hz condition, presenting high impedance value under steep wave superpotential (being called for short VFTO) and the effect of lightning impulse superpotential fast, little resistance induction reactance 6 has insulation restorability helical structure, and winding inter-turn leaves air gap for filling SF
6Gas.
It is characterized in that: the insulation of the middle piezoelectricity utmost point 3, outlet sleeve pipe 4 is being satisfied under the prerequisite of lightning impulse voltage, also satisfies the tolerance level of VFTO---and the maximum field strength of electrode surface under the VFTO effect under the 0.35MPa tonifying Qi pressure is not more than 26kV/mm.
It is characterized in that: SF
6Gas-insulated pot type structure is as the independent tank cell structure, its shape is an independent cylinder tank body, the both ends of sealed shell of tank 1 inner high voltage electrode 2 are circular arc, and the one end is equipped with a disc insulator 8 through Mume flower contact 7, are used for and the seal isolation of GIS pipeline and being communicated with of high-field electrode; The other end of high-field electrode 2 is supported on the base of sealed shell of tank 1 through an insulation support rod 9; Fixing between the cylinder of the middle piezoelectricity utmost point 3 and sealed shell of tank 1 with several insulated supports 10.
It is characterized in that: the middle piezoelectricity utmost point 3 can be directly installed in the GIS bus duct as sealed shell of tank 1, it is bus that high-field electrode 2 adopts the high-pressure conductor in the GIS bus pipe, in the piezoelectricity utmost point 3 be between the cylinder of GIS bus duct and high-field electrode 2 and bus at sealed shell of tank 1, the middle piezoelectricity utmost point 3 and sealed shell of tank 1 are to fix with several insulated supports 10 between the cylinder of GIS bus duct.
It is characterized in that: the middle piezoelectricity utmost point 3 is directly installed in the GIS bus duct as sealed shell of tank 1, high-field electrode 2 by some insulating part 11 fixed covers outside high-pressure conductor is bus 12, it is equipotential that high-field electrode 2 connects into bus 12 usefulness leads, in pressure arm capacitor C 2 by the piezoelectricity utmost point 3 and multilayer in the multilayer coaxially potential electrode 13 constitute, staggered to be installed in sealed shell of tank 1 be between GIS bus duct and the high-field electrode 2 for the piezoelectricity utmost point 3 and multilayer earth potential electrode 13 in the multilayer, the piezoelectricity utmost point 3 interfixes by some equipotential metal pitmans 14 and is fixed on the duct wall that sealed shell of tank 1 is the GIS bus duct by several insulated supports 10 in the multilayer, and multilayer earth potential electrode 13 is fixed on the duct wall of GIS bus duct by several metal fixed heads 15.
It is characterized in that: also can outside sealed shell of tank 1, connect one and independently come pressure arm capacitor C in the trimmer voltage divider
2Capacity and the adjustable condenser 16 of intrinsic standoff ratio.
The invention solves extra-high voltage, UHV (ultra-high voltage) and the high pressure GIS difficult problem with voltage transformer (VT), its capacitive divider structure and technology are simple, and cost is low, and transient characterisitics are good, and major insulation is pure SF
6Gas medium, stable insulation also can be recovered, and insulation margin is big, greatly improves the safe reliability of electrical network; The phenomenon of ferroresonance can not appear in operation on electrical network, and error characteristics are good, not only can be used as voltage transformer (VT) and uses, and can be used as voltage divider or sensor yet and uses; Be not subject to adjacent object, high-voltage connection and arrange to be the proximity effect influence, also be not subjected to the influence to error characteristics of filthy and relative humidity, temperature effect is less, and error characteristics are stablized.The linearity of intrinsic standoff ratio is being on speaking terms of intrinsic standoff ratio and voltage height, and uncertainty comprises that temperature effect, voltage linear, harmonic effects etc. are better than 0.03%.This technology also can be used for the EVT primary transducer of GIS, has improved AC extra high voltage GIS safe reliability.
Description of drawings
Fig. 1, embodiments of the invention one are independent pot type CVT structural representation;
Fig. 2, embodiments of the invention two are little electric current GIS pipeline configuration pot type CVT structural representation;
Fig. 3, embodiments of the invention three are big electric current GIS pipeline configuration pot type CVT structural representation;
The side view of Fig. 4, embodiments of the invention two;
Fig. 5, embodiments of the invention four are the circuit theory diagrams of external adjustable condenser pot type CVT.
Among the figure, the piezoelectricity utmost point, 4 outlet sleeve pipes, 5 electromagnetic units, 6 little resistance induction reactance, 7 Mume flower contacts, 8 disc insulators, 9 insulation support rods, 10 insulated supports, 11 insulating parts, 12 buses, 13 earth potential electrodes, 14 equipotential metal pitmans, 15 metal fixed heads, 16 adjustable condensers in 1 sealed shell of tank, 2 high-field electrodes, 3
Embodiment
The present invention is further detailed explanation below in conjunction with accompanying drawing.
Embodiment
The present invention is applicable among extra-high voltage and the UHV (ultra-high voltage) GIS, as Fig. 1, Fig. 2, Fig. 3, Fig. 4, shown in Figure 5, basic structure of the present invention is, form by sealed shell of tank 1, high-field electrode 2, the middle piezoelectricity utmost point 3, outlet sleeve pipe 4 and electromagnetic unit 5, the high-field electrode 2 and the middle piezoelectricity utmost point 3 all in sealed shell of tank 1, adopt SF
6Gas-insulated pot type structure, electromagnetic unit 5 is plug-in; Sealed shell of tank 1, high-field electrode 2 and in the piezoelectricity utmost point 3 be coaxial cylindrical structure and high-field electrode 2 at innermost layer, the middle piezoelectricity utmost point 3 between sealed shell of tank 1 and high-field electrode 2; Form the high-voltage arm capacitor C between high-field electrode 2 and the middle piezoelectricity utmost point 3 cylinders
1, the middle piezoelectricity utmost point 3 and sealed shell of tank 1 are pressure arm capacitor C in forming between the earth potential electrode cylinder
2, the high-voltage arm capacitor C
1With middle pressure arm capacitor C
2Constitute capacitive divider, middle pressure arm capacitor C
2Can be one or a plurality of combination, the adjustment of above-mentioned electrode length, the number of plies and interelectrode distance can change the intrinsic standoff ratio of capacitive divider, and wherein high-field electrode is that one-time electrode length is decided on the secondary output capacity, and basic size is between 2～3 meters; In the extension line of the piezoelectricity utmost point 3 little resistance induction reactance 6 backs of connecting be connected with electromagnetic unit 5, little resistance induction reactance 6 is installed in the outlet sleeve pipe 4.Little resistance induction reactance 6 is used for damping GIS VFTO and lightning impulse superpotential, grasps and do the influence of superpotential to electromagnetic unit 5.The little resistance induction reactance 6 that seals in presents low impedance value under power frequency 50Hz condition, under VFTO and the effect of lightning impulse superpotential, present high impedance value, reduction VFTO and lightning impulse superpotential act on the superpotential amplitude on electromagnetic unit 5 devices, VFTO oscillation frequency according to the GIS outlet is different with the capacitive divider capacitor value, and the inductance value of little resistance induction reactance 6 is also different.For VFTO oscillation frequency 5MHz, the specified middle pot type CVT that presses 3kV, high-voltage arm electric capacity 1000pF of voltage divider, the inductance value of the little induction reactance 6 of connecting is controlled in 10 μ H～20 μ H scopes.Little resistance induction reactance 6 has the insulation restorability in design, is helical structure, and winding inter-turn leaves air gap for filling SF
6Gas.The insulating Design of the middle piezoelectricity utmost point 3, outlet sleeve pipe 4 has been considered the tolerance level of VFTO, and the maximum field strength of electrode surface under the VFTO effect under the 0.35MPa tonifying Qi pressure is not more than 26kV/mm.
Fig. 1 is that embodiments of the invention one are independent used pot type CVT structural representations behind the configuration sleeve pipe, in embodiment one, the present invention is made up of sealed shell of tank 1, high-field electrode 2, the middle piezoelectricity utmost point 3, outlet sleeve pipe 4 and electromagnetic unit 5, all in sealed shell of tank 1, electromagnetic unit 5 is plug-in for the high-field electrode 2 and the middle piezoelectricity utmost point 3; The major insulation medium is SF
6Gas has the insulating property restorability, and as the independent tank cell structure, sealed shell of tank 1 is an independent cylinder tank body, and inside is full of the SF that is used to insulate
6Gas; The both ends of sealed shell of tank 1 inner high voltage electrode 2 are circular arc, and the one end is equipped with a disc insulator 8 through Mume flower contact 7, are used for promptly being connected with insulating sleeve with the seal isolation of GIS pipeline and the connection of high-field electrode; The other end of high-field electrode 2 is supported on the base of sealed shell of tank 1 through an insulation support rod 9; The piezoelectricity utmost point 3 and sealed shell of tank 1 are that totally 8 insulated supports 10 are fixing with two circles between the earth potential electrode cylinder in one deck; The diameter of sealed shell of tank 1 calculates the SF of 1000kV routinely between 1～1.4m
6The about 1.8m of diameter of gas-insulated pot type VT, about 8 tons of deadweight, end are sent out the blue pressure that bears greater than 120 tons, as adopt 1000kV pot type CVT of the present invention, the diameter of getting sealed shell of tank 1 is 1.4m, its deadweight can be less than 2 tons, end is sent out blue pressure maximum of bearing and is about 70 tons, because adopt the coaxial electrode structure, the insulation tolerance level of a sub-high pressure winding is far longer than the pot type VT that diameter is 1.8m.
Fig. 2 is embodiments of the invention two, promptly little electric current GIS pipeline configuration pot type CVT structural representation, and Fig. 4 is the side view of embodiments of the invention two; In embodiment two, the present invention also is made up of sealed shell of tank 1, high-field electrode 2, the middle piezoelectricity utmost point 3, outlet sleeve pipe 4 and electromagnetic unit 5, and all in sealed shell of tank 1, electromagnetic unit 5 is plug-in for the high-field electrode 2 and the middle piezoelectricity utmost point 3; The major insulation medium is SF
6Gas has the insulating property restorability; Pot type CVT of the present invention is directly installed in the GIS bus duct as sealed shell of tank 1, has been full of SF in the GIS bus duct
6Gas is used for insulation, the GIS bus pipe both had been a sealed shell of tank 1, for relax error requirements or when bus current for less than the little electric current of 4000A the time, high-pressure conductor in the GIS bus duct is that bus is high-field electrode 2, and the piezoelectricity utmost point 3 and sealed shell of tank 1 are to enclose totally 8 insulated support 10 support fixation with two between the GIS bus pipe cylinder in one deck.
Fig. 3 is embodiments of the invention three, it is big electric current GIS pipeline configuration pot type CVT structural representation, in embodiment three, the present invention also is made up of sealed shell of tank 1, high-field electrode 2, the middle piezoelectricity utmost point 3, outlet sleeve pipe 4 and electromagnetic unit 5, all in sealed shell of tank 1, electromagnetic unit 5 is plug-in for the high-field electrode 2 and the middle piezoelectricity utmost point 3; The major insulation medium is SF
6Gas has the insulating property restorability; Pot type CVT of the present invention is directly installed in the GIS bus duct, be full of SF6 gas in the GIS bus duct and be used for insulation, the GIS bus pipe both had been a sealed shell of tank 1, for example have relatively high expectations greatly for rated current greater than the GIS of 4000A and to class of accuracy, the situation that error is stable, high-field electrode 2 by two the circle totally 8 insulating part 11 fixed covers outside high-pressure conductor is bus 12, it is equipotential that high-field electrode 2 is connected with bus 12 usefulness leads, gappedly between high-field electrode 2 and the bus 12 directly do not contact, to prevent that the heat on the high-pressure conductor is directly transferred on the high-field electrode 2, can reduce the influence amount of temperature to the capacitive divider intrinsic standoff ratio like this; Middle pressure arm capacitor C
2By the piezoelectricity utmost point 3 in 3 layers, 2 layers potential electrode 13 and GIS bus tube wall constitute coaxially, GIS bus tube wall also is one deck earth potential electrode, staggered to be installed in sealed shell of tank 1 be between 6IS bus tube wall and the high-field electrode 2 for the piezoelectricity utmost point 3 and 2 layers of earth potential electrode 13 in 3 layers, in 3 layers the piezoelectricity utmost point 3 by two circles totally 8 equipotential metal pitmans 14 interfix and by two circles totally 8 insulated supports 10 to be fixed on sealed shell of tank 1 be on the GIS bus tube wall, 2 layers of earth potential electrode 13 by two circles totally 8 metal fixed heads 15 be fixed on the GIS bus tube wall, GIS bus tube wall i.e. the 3rd layer of earth potential electrode.The piezoelectricity utmost point 3 and earth potential electrode 13 structures are come control capacittance voltage divider intrinsic standoff ratio in adopting 3 layers, and electrode length, the number of plies and interelectrode distance adjustment can change the capacitive divider intrinsic standoff ratio, the middle pressure arm capacitor C among Fig. 3
2=C
21+ C
22+ C
23+ C
24+ C
25The design size of Fig. 3 is: the length of high-field electrode 2 can satisfy the capacitive divider insulating property requirement of the 1000kV GIS of rated current 4000A～8000A, short duration power frequency withstand voltage 1200kV, lightning impulse voltage 2400kV, switching impulse withstand voltage 1960kV with pot type CVT for the 4.2m diameter is that the diameter of the piezoelectricity utmost point 3 in 0.4m, the innermost layer is that 0.8m, sealed shell of tank 1 are that the diameter of GIS bus pipe is 1.3m.
In Fig. 5, be that embodiments of the invention four are the circuit theory synoptic diagram of external adjustable condenser pot type CVT, be the intrinsic standoff ratio of minor adjustments capacitive divider, can also outside tank body, survey external independently adjustable condenser 16, pressure arm electric capacity is C in this moment
2+ C
2'.
Capacitive divider of the present invention is simple in structure, and the electrode that constitutes high-voltage arm capacitor C 1 and middle pressure arm capacitor C 2 is a coaxial electrode, is the SF6 inert gas between electrode.Even electric puncture takes place between electrode, after removal applied voltage, interelectrode insulation characterisitic can be extensive.Such structure has high insulation characterisitic, and the insulating reliability height need not the outside simultaneously the secondary working power is provided, and does not use semiconductor and electron devices such as Laser Devices, integrated circuit, has improved the security and the reliability of operation of power networks.The piezoelectricity utmost point extension line mode of little resistance induction reactance of connecting in the special measure that the present invention takes promptly; make the present invention have VFTO, thunder and lightning (atmosphere) superpotential and the anti-superpotential ability of transmitting among the high tolerance GIS; security and reliability that high secondary (metering, measurement and relay protection) system is arranged, this is for VFTO and transmit for the serious 1000kV electric pressure extra-high voltage GIS of over-voltage protection very important.
Because capacitive divider of the present invention places SF
6Among the gas tank body, be not subjected to factor affecting such as high-voltage connection, adjacent object, contiguous phase power supply, temperature gradient, the additive error influence is little, and error robustness is far above pillar CVT, and is very important for the levels of accuracy that improves the extra-high voltage grid metering.The present invention is because error characteristics are stablized rated capacity C
n(C
1With C
2Shunt capacitance) can select forr a short time than pillar CVT, thereby the capacitive divider volume can miniaturization, its inner energy-storage travelling wave tube (capacitor, compensation reactor) energy storage is little, is of value to the generation that suppresses inner ferroresonance, is of value to improving CVT transient characterisitics level.
The present invention is particularly suitable for UHV (ultra-high voltage) and extra-high voltage GIS usefulness, is applicable to electric energy metrical, relay protection and the electric quantity monitoring of 1000kV electric pressure electrical network, and also extensible 750kV, the 500kV of using reaches more low-voltage grade electrical network; Also can bushing be installed on tank body and draw high-voltage conducting wires, be used for AIS as free-standing voltage transformer (VT).The present invention can take into account the protection system requirement of all kinds of electric system; adaptability is very wide; both can satisfy the requirement that traditional relay protection system has power drive; the needs that also can be very easily be converted to small signal simulation amount or digital quantity for microcomputer protection system provide signal and power, need not to provide in addition the secondary driving power.
Claims (7)
1. can type capacitor voltage mutual inductor is made up of sealed shell of tank, high-field electrode, the middle piezoelectricity utmost point, outlet sleeve pipe and electromagnetic unit, and high-field electrode and middle piezoelectricity extremely all in sealed shell of tank, adopt SF
6Gas-insulated pot type structure, electromagnetic unit is plug-in, it is characterized in that: sealed shell of tank (1), high-field electrode (2) and in the piezoelectricity utmost point (3) be the coaxial cylindrical structure, and high-field electrode (2) at innermost layer, the middle piezoelectricity utmost point (3) between sealed shell of tank (1) and high-field electrode (2); Form the high-voltage arm capacitor C between high-field electrode (2) and the middle piezoelectricity utmost point (3) cylinder
1, the middle piezoelectricity utmost point (3) and sealed shell of tank (1) are pressure arm capacitor C in forming between the earth potential electrode cylinder
2, the high-voltage arm capacitor C
1With middle pressure arm capacitor C
2Constitute capacitive divider, middle pressure arm capacitor C
2Can be one or more combinations, the adjustment of above-mentioned electrode length, the number of plies and interelectrode distance can change the intrinsic standoff ratio of capacitive divider; The extension line of the middle piezoelectricity utmost point (3) is connected, and little resistance induction reactance (6) is back to be connected with electromagnetic unit (5), and little resistance induction reactance (6) is installed in the outlet sleeve pipe (4).
2. can type capacitor voltage mutual inductor according to claim 1, it is characterized in that: the little resistance induction reactance (6) that seals in presents low impedance value under power frequency 50Hz condition, presenting high impedance value under steep wave superpotential (VFTO) and the effect of lightning impulse superpotential fast, little resistance induction reactance (6) has insulation restorability helical structure, and winding inter-turn leaves for filling SF
6The air gap of gas.
3. can type capacitor voltage mutual inductor according to claim 2, it is characterized in that: the insulation of the middle piezoelectricity utmost point (3), outlet sleeve pipe (4) is being satisfied under the prerequisite of lightning impulse voltage, and the maximum field strength of electrode surface under steep wave superpotential (VFTO) acts on fast that also satisfies under the 0.35MPa tonifying Qi pressure is not more than 28kV/mm.
4. can type capacitor voltage mutual inductor according to claim 3, it is characterized in that: capacitive divider can be used as the independent tank cell structure, sealed shell of tank (1) is an independent cylinder tank body, the both ends of sealed shell of tank (1) inner high voltage electrode (2) are circular arc, one end of high-field electrode (2) is equipped with a disc insulator (8) through Mume flower contact (7), is used for and the seal isolation of gas insulated transformer substation (GIS) pipeline and being communicated with of high-field electrode; The other end of high-field electrode (2) is supported on the base of sealed shell of tank (1) through an insulation support rod (9); Fixing between the piezoelectricity utmost point (3) and sealed shell of tank (1) cylinder in one deck with several insulated supports (10).
5. can type capacitor voltage mutual inductor according to claim 3, it is characterized in that: the middle piezoelectricity utmost point (3) can also be directly installed in the GIS bus duct as sealed shell of tank (1), the GIS bus pipe both had been a sealed shell of tank (1), high-pressure conductor in the GIS bus duct is that bus is high-field electrode (2), and the piezoelectricity utmost point (3) and sealed shell of tank (1) are fixing with several insulated supports (10) between the GIS bus pipe cylinder in one deck.
6. can type capacitor voltage mutual inductor according to claim 3, it is characterized in that: the middle piezoelectricity utmost point (3) is directly installed in the GIS bus duct as sealed shell of tank (1), high-field electrode (2) by some insulating parts (11) fixed cover outside high-pressure conductor is bus (12), it is equipotential that high-field electrode (2) is connected with lead with bus (12), in pressure arm capacitor C 2 by the piezoelectricity utmost point (3) and multilayer in the multilayer coaxially potential electrode (13) constitute, staggered to be installed in sealed shell of tank (1) be between GIS bus tube wall and the high-field electrode (2) for the piezoelectricity utmost point (3) and multilayer earth potential electrode (13) in the multilayer, to interfix by some equipotential metal pitmans (14) and be fixed on sealed shell of tank (1) by several insulated supports (10) be on the GIS bus tube wall to the piezoelectricity utmost point (3) in the multilayer, and multilayer earth potential electrode (13) is fixed on the GIS bus tube wall by several metal fixed heads (15).
7. according to claim 4,5 or 6 described can type capacitor voltage mutual inductor, it is characterized in that: also can outside sealed shell of tank (1), connect one and independently come the capacity of middle pressure arm capacitor C 2 of trimmer voltage divider and the adjustable condenser (16) of intrinsic standoff ratio.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100200037A CN1912638B (en) | 2006-08-17 | 2006-08-17 | Can type capacitor voltage mutual inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100200037A CN1912638B (en) | 2006-08-17 | 2006-08-17 | Can type capacitor voltage mutual inductor |
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Cited By (1)
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| CN102611092A (en) * | 2012-03-13 | 2012-07-25 | 福建省电力勘测设计院 | Mutation overvoltage impedance suppression device for electronic voltage transformer and application of device |
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| JP5476524B2 (en) * | 2009-09-02 | 2014-04-23 | 株式会社明電舎 | Vacuum capacitor type instrument transformer |
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| CN102809677B (en) * | 2012-07-17 | 2015-02-04 | 西北核技术研究所 | Method for calibrating thin-film capacitor voltage divider |
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| CN106771464A (en) * | 2016-12-30 | 2017-05-31 | 无锡市锡容电力电器有限公司 | A kind of can type capacitor voltage mutual inductor for high pressure GIS |
| US11817247B2 (en) * | 2022-01-21 | 2023-11-14 | G & W Electric Company | Automatic calibration system and method for passive low-power voltage transformer |
| CN115047301A (en) * | 2022-06-29 | 2022-09-13 | 中国电力科学研究院有限公司 | Method and system for measuring power frequency superposition operation impulse voltage signal |
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