CN201259831Y - 1000kV electromagnetic accurate voltage mutual inductor for magnitude tracing - Google Patents
1000kV electromagnetic accurate voltage mutual inductor for magnitude tracing Download PDFInfo
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- CN201259831Y CN201259831Y CNU2008201904427U CN200820190442U CN201259831Y CN 201259831 Y CN201259831 Y CN 201259831Y CN U2008201904427 U CNU2008201904427 U CN U2008201904427U CN 200820190442 U CN200820190442 U CN 200820190442U CN 201259831 Y CN201259831 Y CN 201259831Y
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Abstract
The utility model relates to a 1000kV magnetic precise voltage transformer used in magnitude tracing, mainly being composed of a box body, a bushing, a top-end voltage-sharing ball and a lower-end voltage-sharing ball; SF6 insulating gas is charged in the box body, and the transformer body is arranged at the bottom part of the box body in a symmetrical state; a plum contact terminal type plug connector which is taken as a first electric conducting tube in the bushing is connected with a high-voltage winding and a high-voltage shield cover in a transition way, and the plug connector is fixed on the box body by adopting a limit insulating tension pole at the upper end of the box body, and the middle shield in the bushing is carried out by adopting a disc spacer and the plug connector, and the two ends of the limit insulating tension pole are reinforced and supported; wherein, the diameter of the top-end voltage-sharing ball is 2600mm, the diameter (inside diameter) of the lower-end voltage-sharing ball is 1400mm, ring radius is 250mm; a low-voltage winding in the transformer body is uniform, and the winding is wound compactly; a high-voltage winding is wound in a stepping way and has 56840 loops. The uncertainty of measurement of the 1000kV magnetic precise voltage transformer can be controlled about 2*10<-5>, and the accuracy class can reach 0.01.
Description
Technical field
The utility model relates to a kind of 1000 kV electromagnetic accurate voltage mutual inductor for magnitude tracing, can be used for the tracing to the source of 1000kV electric pressure power-frequency voltage ratio standard value, transmission and value preserves, 1000kV electric pressure line voltage distribution sensor error Characteristics Detection, the voltage accurate measurement check that the active loss of 1000kV electric pressure circuit is measured etc., also can be used for the scientific research in ultra high voltage field, belong to the large-scale precision equipment of test of power frequency ultra high voltage and metering.
Background technology
The enforcement of China 1000kV AC extra high voltage experiment and demonstration engineering is brought up to 1000kV with China's line voltage grade from 750kV, makes China's electric power network technique step on a new stage.Raising along with electric pressure, the design of power equipment, manufacturing and test difficulty all sharply increase, many ultra high voltage checkout equipments also all are blank in the world, comprise 1000 kV electromagnetic accurate voltage mutual inductor for magnitude tracing (also claiming the electromagnetic type standard potential transformer).
In the 1000kV electrical network, an important technology parameter that is used for the visual plant 1000kV voltage transformer of electric energy metrical, primary voltage monitoring and system's relaying protection---error characteristics are measured, need calibrate with the higher standard set-up of accuracy class (as accurate voltage mutual inductor), and the higher standard set-up of accuracy class also needs to solve the magnitude tracing problem; Along with follow-up 1000kV scale of power is built; the visual plant that is used for electric energy metrical, primary voltage monitoring and system's relaying protection is except 1000kV capacitance type potential transformer (CVT); also might adopt the voltage measuring apparatus of electronic type voltage transformer and other type, need the higher standard set-up of accuracy class to detect equally.
Raising along with electric pressure, corresponding national magnitude tracing and value system, also need to dispose 1000kV power-frequency voltage ratio standard, and accuracy height, stable performance, accurate voltage mutual inductor that reliability is high are the best type power-frequency voltage ratio standard devices that can preserve power-frequency voltage ratio value.The national power-frequency voltage ratio standard device of the 1000kV electric pressure of setting up should dispose 0.01 grade of accuracy, uncertainty of measurement is better than 0.003% 1000kV electromagnetic accurate voltage mutual inductor.
Power-frequency voltage ratio standard device mainly contains two kinds of structures: electromagnetic accurate voltage mutual inductor and condenser type power-frequency voltage ratio standard device.Electromagnetic accurate voltage mutual inductor structure, principle are clear, the long-time stability height, has the certain power fan-out capability, be convenient to change no-load voltage ratio, the transmission of quantity value that not only is fit to the conventional strong signal of line voltage instrument transformer also can be used for the verification of the weak voltage of other electronic type voltage transformer (transducer), digital quantity.And condenser type power-frequency voltage ratio standard is mainly used in the measuring voltage coefficient, is not easy to preserve stable ratio data, and the voltage ratio value needs to be traceable on the electromagnetic accurate voltage mutual inductor under lower voltage temporarily.Export when condenser type power-frequency voltage ratio standard configuration electron-amplifier has certain power, but long-time stability are bad, need calibrate under low-voltage temporarily and can use, break down and to be found, the circuit more complicated, reliability is affected, and uses inconvenient.Detect (transmission of quantity value) even the configuration of condenser type power-frequency voltage ratio standard is used for electric power transformer field, because of its manipulative procedure complexity, the professional that also only the applicable technology level is very high uses.
Raising along with electric pressure, the electromagnetic accurate voltage mutual inductor insulation level requires to improve, the volume of equipment will increase, the quality weightening finish, the development difficulty is very big, the professional knowledge that needs the development personnel to possess is very wide, its specialty relates to many-sided professional knowledges such as Precise Electric Measurement, high voltage technique, insulation theory, design of pressure vessels and manufacturing, instrument transformer design, material, machining, also will possess the High-Voltage Electrical Appliances manufacturing experience.
2005, China national high voltage measuring station (being arranged on Wuhan High Voltage Research Institute Of State Grid) and Shandong Thailand open electric group and develop the 765kV electromagnetic accurate voltage mutual inductor jointly, accuracy class in secondary winding output 0VA～1VA range of capacity reaches 0.01 grade, and uncertainty of measurement is better than 3 * 10
-5(the actual measurement uncertainty of measurement is less than 2.6 * 10
-5, k
95=2.03), upper limit measuring range can reach 150% of rated voltage and (can satisfy no-load voltage ratio
The error measure of voltage of power instrument transformer protected level winding), make the technical merit of China's power-frequency voltage ratio standard device surpass the state-of-the-art country of power-frequency voltage ratio standard technology in the world such as Canada, Germany.Succeeding in developing of 765kV electromagnetic accurate voltage mutual inductor established the basis that China carries out the development of 1000kV electromagnetic accurate voltage mutual inductor.
But, raising along with electric pressure, particularly reach 1000kV (ultra high voltage) grade, the structural design of testing equipment is the same with the ultra high voltage electric equipment, its insulation characterisitic is saturation condition, can not structurally adopt the guiding theory of amplifying for how much to carry out the design and the manufacturing of large-scale precision testing equipment, need will do bigger change on many structural design details, at first, 1000kV electromagnetic accurate voltage mutual inductor insulating requirements is to guarantee
The level of short duration power frequency withstand voltage, the height of high-voltage terminal sleeve pipe reaches 8m, and casing inner diameter reaches 800mm, causes the inner increase of all pressures shield size, interior structural support just widely different with the 765kV standard potential transformer; The degree of wriggling of large scale material, mechanical property such as expand with heat and contract with cold cause the connection of primary conductive pipe and mounting means also and take place between the 765kV standard potential transformer than big-difference; The device body of box house comprises shield size and edge curvature, high pressure Winding Design and technique for coiling etc., and all the increase because of the built-in electrical insulation size changes, and need change on the basis in design, the manufacturing of 765kV standard potential transformer.
Summary of the invention
The purpose of this utility model is to provide a kind of 1000 kV electromagnetic accurate voltage mutual inductor for magnitude tracing, for the material preparation is carried out in the magnitude tracing and the foundation of transmission of quantity value system of China 1000kV power-frequency voltage ratio standard, also be used for simultaneously 1000kV transformer station, the 1000kV voltage transformer, the 1000kV voltage sensor is on-the-spot to be detected with the calibration of standard set-up and the quality assurance of on-the-spot detection architecture, formally carry out to lay the foundation for the power-frequency voltage ratio magnitude tracing of 1000kV electrical network electric energy metrical and transmission of quantity value work, for carrying out the extra-high-voltage alternating current voltage sensor senses, the accurate measurement of 1000kV circuit active loss provides the precision standard checkout gear.Simultaneously, carry out the theoretical research of ultra high voltage technical foundation for each ultra high voltage laboratory of China, particularly the magnitude tracing of laboratory ultra high voltage measuring system provides support.
The technical solution of the utility model is: a kind of 1000 kV electromagnetic accurate voltage mutual inductor for magnitude tracing, mainly be made of casing, sleeve pipe, top voltage equalizing ball, lower end grading ring etc., the top voltage equalizing ball is installed in the sleeve pipe upper end, the outer both sides of pipe, lower end connect the lower end grading ring; The pressure vessel casing is fixedlyed connected with the bottommost of sleeve pipe, fills the insulating gas with SF6 in casing; The device body is placed in bottom half, and is in symmetry status in casing; Primary conductive pipe, intershield and three coaxial metal bodies of earth shield in the sleeve pipe are arranged in order from inside to outside and form two coaxial electric field, it is characterized in that: top voltage equalizing ball diameter 2600mm, lower end grading ring diameter (internal diameter) 1400mm, ring footpath 250mm; The transition with device body inner high voltage winding is connected as primary conductive pipe in the sleeve pipe to utilize Mume flower contact formula plug connector, and it respectively with primary conductive pipe and device body in the high-tension shielding cover be electrically connected, and the spacing insulated tension pole fixing plug-in connector that adopts the casing upper end is on casing; Intershield employing disc insulator and plug connector, spacing insulated tension pole two ends reinforce to be supported.
Aforesaid 1000 kV electromagnetic accurate voltage mutual inductor for magnitude tracing, it is characterized in that: the device body is mainly by iron core, the low pressure winding, the winding shielding, the high pressure winding, folder, the high-tension shielding cover, the side shielding, insulating cylinder constitutes, folder is in the outermost end of device body, be overall structure, the folder inboard is the side shielding, unshakable in one's determination, the low pressure winding, the winding shielding, high pressure winding and high-tension shielding cover are arranged in order from inside to outside, and it is symmetrical up and down at device body center, suit insulating cylinder on the stem stem of iron core, the low pressure winding is even, closely be wound on the stem stem unshakable in one's determination, adopt ladder pattern coiling high pressure winding, net sectional area 615cm unshakable in one's determination, the high pressure winding is totally 56840 circles.
Aforesaid 1000 kV electromagnetic accurate voltage mutual inductor for magnitude tracing is characterized in that: the actual working pressure of SF6 insulating gas is controlled between 0.35MPa～0.38MPa (relative value).
Operation principle of the present utility model is: top of the present utility model voltage equalizing ball, lower end grading ring are used to improve integrally-built electric field and evenly distribute, the device body of bearing primary voltage (high voltage) and secondary voltage (low-voltage) translation function is placed in the pressure vessel bottom half, and in casing, be in symmetry status, to guarantee that the device body bears the parts high-tension shielding cover of high potential and the inwall of casing has enough insulation distances; The high-tension shielding cover and the plug connector that are in high potential are electrically connected, and plug connector is electrically connected with the primary conductive pipe again, and high potential is drawn out to the space through the top voltage equalizing ball again; The effect of spacing insulated tension pole is that plug connector is fixed on the casing, constant to guarantee the plug connector relative position, firm plug connector also is used to strengthen the mechanical strength properties of high-tension shielding cover and primary conductive pipe, and the transition with the high pressure winding of device body is connected as the primary conductive pipe with plug connector, the external carbuncle that available buffer primary conductive pipe expands with heat and contract with cold and produces.
Sleeve pipe adopts the silicon rubber compound insulating sleeve, has certain flexibility, influences in the external force that installation, transportation, use occur with buffering the utility model; In order to guarantee inside pipe casing and outside Electric Field Distribution uniformity, used intershield and earth shield, guarantee that the utility model satisfies the requirement of maximum operating voltage (power-frequency voltage 866kV, effective value) under standard atmospheric conditions; Adopt earth shield, intershield and primary conductive pipe to form two coaxial electric field, capacitance partial pressure principle according to coaxial capacitance formation, pro rate earth shield, intershield and primary conductive pipe according to 4:6 form two voltages that electric field applies, guarantee that intershield and two electrode surface electric field strength of primary conductive pipe are approaching, to reach the purpose that makes full use of inside pipe casing space, even internal electric intensity; Different with the 765kV standard potential transformer is, the raising of insulation level, need to increase inside and outside space length, cause primary conductive pipe, intershield, sleeve pipe equidimension lengthening, overstriking, bigger variation takes place in the stress of each parts, creep, mechanical performance such as expand with heat and contract with cold.In order to address the above problem, intershield has used two disc insulators to do support, the disc insulator and the plug connector of lower end are fixed together, the disc insulator and the primary conductive pipe of upper end are fixed together, to strengthen the mechanical strength properties between intershield, primary conductive pipe, the earth shield, prevent that relative position each other from changing under external force, with the stability that guarantees that internal electric field distributes; The lower end of primary conductive pipe is injected among the plug connector, play the fixedly effect of primary conductive pipe position, simultaneously can alleviate the distortion of expanding with heat and contract with cold and causing, so that guarantee the uniformity of electric field between electrode, plug connector can absorption temperature change the primary conductive length of tube telescopic variation that causes.
Device body of the present utility model selects for use magnetic permeability height, sheet thick in 0.27 the high-quality cold-reduced silicon sheet material as iron core, and silicon steel sheet adopts oblique angle opposite joint connected mode, rated operational voltage (power-frequency voltage 577kV, effective value) magnetic unshakable in one's determination under is close about 0.8 tesla, to satisfy the error characteristics requirement in rated voltage 20%～120% scope; Suit insulating cylinder on the stem stem of iron core, the secure limit function that can rotational slide in insulating cylinder two ends; The low pressure winding should evenly, closely be wound on the stem stem unshakable in one's determination, improves the magnetic coupling intensity of low pressure winding; The winding shielding is used to intercept the influence of stray capacitance electric current between low pressure winding and high pressure winding; Folder is an overall structure, and the available error characteristics that prevent iron core looseness and cause change; The effect of uniform electric field is played in high-tension shielding cover and side shielding.Different with the 765kV standard potential transformer is, the raising of insulation level, and the increase of device body size is easy to generate the difficulty on the manufacturing process.For this reason, increase area of core section in the design relatively, reduce the high pressure umber of turn in the device body, be beneficial to the high pressure winding and in the high temperature drying solidification process, do not deform, be of value to the leakage field that reduces between winding simultaneously, improve the global error performance.
The utility model adopts the superior SF of insulation property
6Insulating gas is used to improve inner electrical insulation properties as main dielectric, has dwindled the built-in electrical insulation metric space, has reduced device body overall volume and weight, has reduced no-load loss, makes the global error characteristic curve level and smooth, stable.
The beneficial effects of the utility model are: a kind of 1000 kV electromagnetic accurate voltage mutual inductor for magnitude tracing, its uncertainty of measurement can be controlled at 2 * 10
-5About, class of accuracy can reach 0.01 grade, and its structural variation also has some advantages: (1) is installed top voltage equalizing ball and lower end grading ring simultaneously and can better be improved integrally-built electric field and evenly distribute on the 1000kV electromagnetic accurate voltage mutual inductor; (2) adopted plug connector, spacing insulated tension pole, prevented that the relative position between the associated components from changing under external force, to guarantee the stability that internal electric field distributes and to increase the device for mechanical strength character; (3) the low pressure winding evenly, closely is wound on the stem stem unshakable in one's determination, improved the magnetic coupling intensity of low pressure winding, high pressure umber of turn in the device body is few, helping the high pressure winding does not deform in the high temperature drying solidification process, be of value to the leakage field that reduces between winding simultaneously, improve the global error performance.
Description of drawings
Fig. 1, the overall structure schematic diagram of the utility model embodiment.
Fig. 2 is the machine body structure schematic diagram among Fig. 1.
Embodiment
Below in conjunction with drawings and Examples a kind of 1000 kV electromagnetic accurate voltage mutual inductor for magnitude tracing of the utility model is described in detail.
The explanation of mark among Fig. 1: 1-device body, 2-casing, 3-disc insulator, 4-sleeve pipe, 5-primary conductive pipe, 6-top voltage equalizing ball, 7-intershield, 8-earth shield, 9-lower end grading ring, 10-plug connector, the spacing insulated tension pole of 11-, 12-SF
6Insulating gas;
The explanation of mark among Fig. 2: 13-iron core, 14-low pressure winding, the shielding of 15-winding, 16-high pressure winding, 17-folder, 18-high-tension shielding cover, the shielding of 19-side, 20-insulating cylinder.
The overall structure schematic diagram of the utility model embodiment as shown in Figure 1,1000 kV electromagnetic accurate voltage mutual inductor for magnitude tracing mainly is made of casing 2, sleeve pipe 4, top voltage equalizing ball 6 and lower end grading ring 9 etc.; Top voltage equalizing ball 6 is installed in the sleeve pipe upper end, the outer both sides of pipe, lower end connect lower end grading ring 9; Pressure vessel casing 2 is fixedlyed connected with the bottommost of sleeve pipe 4, fills with SF in casing 2
6Insulating gas 12; Device body 1 is placed in casing 2 bottoms, and is in symmetry status in casing 2; Primary conductive pipe 5, intershield 7 and 8 three coaxial metal bodies of earth shield in the sleeve pipe 4 are arranged in order from inside to outside and form two coaxial electric field, the disc insulator 3 and the plug connector 10 of intershield 7 lower ends are fixed together, and the disc insulator 3 and the primary conductive pipe 5 of upper end are fixed together; The effect of the spacing insulated tension pole 11 of casing 2 upper ends is that plug connector 10 is fixed on the casing 2;
Machine body structure schematic diagram among Fig. 1 as shown in Figure 2, comprise unshakable in one's determination 13, low pressure winding 14, winding shielding 15, high pressure winding 16, folder 17, high-tension shielding cover 18, side shielding 19, insulating cylinder 20, folder 17 is in the outermost end of device body 1, be overall structure, folder 17 inboards are side shieldings 19, unshakable in one's determination 13, low pressure winding 14, winding shielding 15, high pressure winding 16 and high-tension shielding cover 18 are arranged in order from inside to outside, and it is symmetrical up and down at device body 1 center, suit insulating cylinder 20 on unshakable in one's determination 13 stem stem, low pressure winding 14 is even, closely be wound on the stem stem of iron core 13, adopt ladder pattern coiling high pressure winding 16;
1000 kV electromagnetic accurate voltage mutual inductor for magnitude tracing utilizes plug connector 10 to be connected with the transition of device body 1 inner high voltage winding 16 as primary conductive pipes 5 in the sleeve pipe 4, and it is electrically connected with the interior high-tension shielding cover 18 of primary conductive pipe 5 and device body 1 respectively.
The size Selection method and the scope of some parts of the utility model are as follows: being used to improve the equally distributed top of integrally-built electric field voltage equalizing ball 6 diameters should not be less than 2500mm, size increases again, be of value to and improve Electric Field Distribution, but the electric field strength improvement degree that diameter surpasses behind the 2500mm is tending towards saturated phenomenon, and the increase of top voltage equalizing ball 6 diameters can be gained in weight, and causes cost to rise and the global instability increasing; The Electric Field Distribution that 9 pairs of lower end grading rings improve the lower end has certain benefit, and internal diameter should not be less than 1200mm, ring footpath should not be less than 200mm; In order to guarantee sleeve pipe 4 inner and outside field uniformities, sleeve pipe 4 internal diameters are not less than 780mm, highly are not less than 7600mm, and primary conductive pipe 5 diameters are between 120mm～150mm; For guaranteeing that short duration power frequency withstand voltage 866kV (approximately
) requirement, make in the design that the surface field intensity of primary conductive pipe 5 and intershield 7 surface field intensity are approaching; Selecting the length of earth shield 8 is about 12% of sleeve pipe 4 length, should bear 55%～60% voltage between earth shield 8 and the intershield 7, and the length of intershield 7 is determined according to the coaxial capacitance voltage divider principle; High pressure winding 16 adopts the method for shrinking every layer of umber of turn gradually, makes the number of turn on outer (top) account for 70% of innermost layer (bottom) number of turn, to improve the insulation property of device body 1; Unshakable in one's determination 13 sectional area is selected relevant with the number of turn of high pressure winding 16, low pressure winding 14, and the number of turn of high pressure winding 16, low pressure winding 14 is selected relevant with layer insulation thickness, the selection of these parameters is determining excitation impedance of the present utility model and leakage reactance value, error performance is had a direct impact, need to calculate and the demonstration test affirmation through a large amount of; Should determine the height and the layer insulation thickness of high pressure winding 16 by the highest insulation (short duration power frequency withstand voltage), during rated operating pressure 0.4MPa, inner SF
6Electric field strength in the gas 12 under the highest power frequency operating voltage should not surpass 10kV (root mean square value)/mm, highly takes all factors into consideration unshakable in one's determination 13 sectional area according to the high pressure winding 16 that this parameter is determined, is determined the number of turn of high pressure winding 16 by unshakable in one's determination 13 sectional area.
Draw the concrete parameter of parts among the utility model embodiment according to above principle: sleeve pipe 4 is the silicon rubber compound insulating sleeve, its internal diameter 800mm, length 8m, earth shield 8 internal diameter 672mm, length 0.92m, material 3mm, intershield 7 internal diameter 410mm, length 2.86m, material thickness are 3mm; The material of earth shield 8 and intershield 7 is a rustproof aluminium sheet, manufactures for guaranteeing the smooth employing flow forming and molding process of electrode surface, and surface roughness is better than 3 μ m; In order to reduce the requirement of casing 2 inner SF6 insulating gas 12 pressure to casing 2 material thicknesses, to alleviate the utility model overall weight, the actual working pressure of inner SF6 insulating gas 12 is controlled between 0.35MPa～0.38MPa (relative value) and gets final product; Be used to improve the equally distributed top of integrally-built electric field voltage equalizing ball 6 diameter 2600mm, lower end grading ring 9 internal diameter 1400mm, ring footpath 250mm; Unshakable in one's determination 13 net sectional area 615cm, high pressure winding 16 is totally 56840 circles.
Claims (3)
1, a kind of 1000 kV electromagnetic accurate voltage mutual inductor for magnitude tracing mainly is made of casing, sleeve pipe, top voltage equalizing ball, lower end grading ring, and the top voltage equalizing ball is installed in the sleeve pipe upper end, the outer both sides of pipe, lower end connect the lower end grading ring; The pressure vessel casing is fixedlyed connected with the bottommost of sleeve pipe, fills with SF in casing
6Insulating gas; The device body is placed in bottom half, and is in symmetry status in casing; Primary conductive pipe, intershield and three coaxial metal bodies of earth shield in the sleeve pipe are arranged in order from inside to outside and form two coaxial electric field, it is characterized in that: top voltage equalizing ball diameter 2600mm, lower end grading ring internal diameter 1400mm, ring footpath 250mm; The transition with device body inner high voltage winding is connected as primary conductive pipe in the sleeve pipe to utilize Mume flower contact formula plug connector, and it respectively with primary conductive pipe and device body in the high-tension shielding cover be electrically connected, and the spacing insulated tension pole fixing plug-in connector that adopts the casing upper end is on casing; Intershield employing disc insulator and plug connector, spacing insulated tension pole two ends reinforce to be supported.
2,1000 kV electromagnetic accurate voltage mutual inductor for magnitude tracing according to claim 1, it is characterized in that: the device body is mainly by iron core, the low pressure winding, the winding shielding, the high pressure winding, folder, the high-tension shielding cover, the side shielding, insulating cylinder constitutes, folder is in the outermost end of device body, be overall structure, the folder inboard is the side shielding, unshakable in one's determination, the low pressure winding, the winding shielding, high pressure winding and high-tension shielding cover are arranged in order from inside to outside, and it is symmetrical up and down at device body center, suit insulating cylinder on the stem stem of iron core, the low pressure winding is even, closely be wound on the stem stem unshakable in one's determination, adopt ladder pattern coiling high pressure winding, net sectional area 615cm unshakable in one's determination, the high pressure winding is totally 56840 circles.
3,1000 kV electromagnetic accurate voltage mutual inductor for magnitude tracing according to claim 1 and 2 is characterized in that: SF
6The actual working pressure of insulating gas is controlled between 0.35MPa～0.38MPa.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201904427U CN201259831Y (en) | 2008-08-22 | 2008-08-22 | 1000kV electromagnetic accurate voltage mutual inductor for magnitude tracing |
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|---|---|---|---|
| CNU2008201904427U CN201259831Y (en) | 2008-08-22 | 2008-08-22 | 1000kV electromagnetic accurate voltage mutual inductor for magnitude tracing |
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| CN201259831Y true CN201259831Y (en) | 2009-06-17 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102543439A (en) * | 2011-12-29 | 2012-07-04 | 山东泰开互感器有限公司 | Separated inverted standard capacitor with voltage division shielding |
| CN107275064A (en) * | 2017-07-31 | 2017-10-20 | 武汉磐电科技股份有限公司 | 500kV standard potential transformers |
| CN107578905A (en) * | 2017-10-17 | 2018-01-12 | 天津市百利纽泰克电气科技有限公司 | A kind of structure and method for improving voltage transformer partial discharge performance |
| CN107768114A (en) * | 2017-11-29 | 2018-03-06 | 魏琳 | A kind of composite high-voltage insulator energizes transformer |
-
2008
- 2008-08-22 CN CNU2008201904427U patent/CN201259831Y/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102543439A (en) * | 2011-12-29 | 2012-07-04 | 山东泰开互感器有限公司 | Separated inverted standard capacitor with voltage division shielding |
| CN107275064A (en) * | 2017-07-31 | 2017-10-20 | 武汉磐电科技股份有限公司 | 500kV standard potential transformers |
| CN107275064B (en) * | 2017-07-31 | 2019-05-03 | 武汉磐电科技股份有限公司 | 500kV standard potential transformer |
| CN107578905A (en) * | 2017-10-17 | 2018-01-12 | 天津市百利纽泰克电气科技有限公司 | A kind of structure and method for improving voltage transformer partial discharge performance |
| CN107768114A (en) * | 2017-11-29 | 2018-03-06 | 魏琳 | A kind of composite high-voltage insulator energizes transformer |
| CN107768114B (en) * | 2017-11-29 | 2024-05-24 | 魏琳 | High-voltage composite insulation energy supply transformer |
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