CN103413636B - A kind of extra-high voltage direct-current post composite insulator being configured with inner shield electrode - Google Patents
A kind of extra-high voltage direct-current post composite insulator being configured with inner shield electrode Download PDFInfo
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Abstract
The present invention relates to a kind of extra-high voltage direct-current post composite insulator, comprise: more piece insulator, inner shield electrode and multiple shading ring, linked together by spacer flanger between two joint insulators adjacent in more piece insulator, first segment insulator is called near the insulator of high-pressure side in more piece insulator, the top of first segment insulator is provided with top flange, spacer flanger is provided with between the tail end and the top of second section insulator of first segment insulator, shading ring is separately installed with in a distance separately at distance top flange and spacer flanger, inner shield electrode comprises the first inner shield electrode and the second inner shield electrode, first inner shield electrode is arranged on the top of first segment insulator, second inner shield electrode is arranged on the tail end of first segment insulator, one end of first inner shield electrode and top Flange joint, the other end extends in first segment insulator, one end of second inner shield electrode is connected with spacer flanger, the other end extends in first segment insulator.
Description
Technical field
The invention belongs to extra-high voltage direct-current transmission post insulator technical field, be specifically related to a kind of end construction of extra-high voltage direct-current post composite insulator.
Background technology
China's energy resources and productivity dynamics are contrary distribution, and northwest, southwest energy reserve is abundant and load is few, and eastern region is economically developed, energy consumption is large, and resource is but very deficient.Because Western Energy Resources base and east load center distance are at about 1000 ~ 3000km, so Devoting Major Efforts To Developing western water power, thermoelectricity resource, implement transferring electricity from the west to the east, realize simultaneously electric power north and south supply mutually, on national network, to realize the most optimum distribution of resources of nationwide and energy source optimization supply, it is 21 century Chinese energy and the power industry basic strategy of building.Extra-high voltage direct-current transmission is the important means solving high voltage, Large Copacity, remote and Power System Interconnection at present.
In extra-high voltage direct-current power station, post insulator is for the dielectric between high voltage electric equipment (smoothing reactor, bus and isolating switch etc.) and earth electrode and mechanical connection.The post insulator used in current power station mainly contains full porcelain knob insulator, all-ceramic core rod composite jacket pillar insulator, cannulated sleeve composite jacket pillar insulator and epocel plug composite jacket pillar insulator.Because composite post insulator is lightweight, volume is little, not easily broken, easy transportation and installation, particularly have excellent resistance to pollution flashover and moisture-proof sudden strain of a muscle performance, it is widely used in power station.
Owing to being subject to the impact of power station inner high voltage bus, high-tension apparatus, other floating potential equipment and ground potential distribution impedance, the Electric Field Distribution of post insulator is extremely uneven.The distortion of post insulator on high-tension side Electric Field Distribution is serious, and the cluster parachute particularly near flange and composite sheath surface, subject the electric field strength than high several times of middle part full skirt.In addition, in the junction of insulator end gold utensil, plug and composite sheath, because Electric Field Distribution is very concentrated, under the filthy condition such as misty rain, travel fatigue, be vulnerable to galvanic corrosion and damage, accelerate insulator deterioration, even cause Insulator detection.For this reason, be necessary to be improved the structural shape of post composite insulator, improve its current potential, Electric Field Distribution, the object of prevent corona to reach, suppress galvanic corrosion to be damaged, suppress partial discharge, delay ageing of insulation and raising flashover voltage, thus ensure power plant safety reliability service.
The current potential of post composite insulator, the improvement of Electric Field Distribution, main method installs shading ring.But, in ultra high voltage power station, because electric pressure is higher, post insulator diameter becomes large, relies on the method for installing shading ring merely, to insulator end gold utensil, plug and composite sheath three the high field intensity of interface improve limitation.
Summary of the invention
The object of the invention is to solve existing high-voltage strut composite insulator and pressure-equalizing device Problems existing thereof, a kind of method improving post composite insulator end current potential, Electric Field Distribution is provided, is namely configured with the post composite insulator of interior electrode.
For reaching above object, extra-high voltage direct-current post composite insulator of the present invention, it comprises: more piece insulator, inner shield electrode and multiple shading ring, it is characterized in that, linked together by spacer flanger between two joint insulators adjacent in more piece insulator, first segment insulator is called near the insulator of high-pressure side in more piece insulator, the top of first segment insulator is provided with top flange, above-mentioned spacer flanger is provided with between the tail end and the top of second section insulator of first segment insulator, shading ring is being separately installed with in a distance separately apart from above-mentioned top flange and above-mentioned spacer flanger, above-mentioned inner shield electrode comprises the first inner shield electrode and the second inner shield electrode, above-mentioned first inner shield electrode is arranged on the top of above-mentioned first segment insulator, above-mentioned second inner shield electrode is arranged on the tail end of above-mentioned first segment insulator, one end of above-mentioned first inner shield electrode and above-mentioned top Flange joint, the other end extends in above-mentioned first segment insulator, one end of above-mentioned second inner shield electrode is connected with above-mentioned spacer flanger, the other end extends in above-mentioned first segment insulator.
In the extra-high voltage direct-current post composite insulator of the invention described above, above-mentioned shading ring, above-mentioned first inner shield electrode, above-mentioned second inner shield electrode, above-mentioned top flange and above-mentioned spacer flanger are metal material, above-mentioned first inner shield electrode and above-mentioned top flange are electrically connected, and above-mentioned second inner shield electrode and above-mentioned spacer flanger are electrically connected.
In the extra-high voltage direct-current post composite insulator of the invention described above, above-mentioned shading ring comprises: on the flange of above-mentioned top 100-500mm place by support installing, with equipotential first shading ring of above-mentioned top flange; Under the flange of above-mentioned top 100-500mm place by support installing, with the equipotential secondary shielding ring of above-mentioned top flange; On spacer flanger between first segment insulator and second section insulator or under 0-500mm place by support installing, with equipotential 3rd shading ring of this spacer flanger.
In the extra-high voltage direct-current post composite insulator of the invention described above, above-mentioned shading ring also comprises: between above-mentioned top flange and above-mentioned secondary shielding ring and under the flange of top 50-200mm place install, with equipotential 4th shading ring of above-mentioned top flange; On spacer flanger between first segment insulator and second section insulator 50-200mm place by support installing, with equipotential 5th shading ring of this spacer flanger.
In the extra-high voltage direct-current post composite insulator of the invention described above, above-mentioned first, second, third shading ring diameter is 1000-2000mm, tube section diameter is 120mm-300mm, and above-mentioned 4th, the 5th shading ring diameter is 400-800mm, and tube section diameter is 40-100mm.
In the extra-high voltage direct-current post composite insulator of the invention described above, described more piece insulator is the composite jacket pillar insulator be made up of composite sheath and cannulated sleeve or composite sheath and solid mandrel, described composite sheath is set in the outside of described cannulated sleeve or described solid mandrel, in the cannulated sleeve that above-mentioned first inner shield electrode is embedded in above-mentioned first segment insulator top or solid mandrel, in the cannulated sleeve that above-mentioned second inner shield electrode is embedded in above-mentioned first segment insulator tail end or solid mandrel.
In the extra-high voltage direct-current post composite insulator of the invention described above, the structure of above-mentioned first inner shield electrode and above-mentioned second inner shield electrode is ring-type or column, extends to the end rounding in above-mentioned first segment insulator.
In the extra-high voltage direct-current post composite insulator of the invention described above, the length of first, second inner shield electrode above-mentioned is 60-200mm.
In the extra-high voltage direct-current post composite insulator of the invention described above, then above-mentioned first inner shield electrode is connected by mucilage binding with above-mentioned solid epoxy plug by single-casting once-forming with above-mentioned top flange, and then above-mentioned second inner shield electrode is connected by mucilage binding with above-mentioned solid epoxy plug by single-casting once-forming with above-mentioned spacer flanger.
In the extra-high voltage direct-current post composite insulator of the invention described above, first above-mentioned first inner shield electrode and above-mentioned second inner shield electrode are embedded in solid epoxy plug manufacture process, then by screw rod by above-mentioned top flange and above-mentioned first inner shield Electrode connection, by above-mentioned spacer flanger and above-mentioned second inner shield Electrode connection, above-mentioned top flange and above-mentioned spacer flanger are connected respectively by employing mucilage binding and are connected with above-mentioned solid epoxy plug.
The architectural feature of above-mentioned extra-high voltage direct-current post composite insulator inner shield electrode is: at the composite insulator solid core rob of first segment insulator top, high-pressure side and tail end or cannulated sleeve respectively to embedded set inner shield electrode.One end of two inner shield electrodes and end part of composite insulator Flange joint, the other end stretches in epoxy plug or in Hollow Compound sleeve.The structural shape of inner shield electrode is ring-type or column, head rounding.Concrete shape as shown in Figure 2, but is not limited only to accompanying drawing 2.
By calculating the Electric Field Simulation of extra-high voltage direct-current (± 1100kV) post composite insulator, confirm that the shield effectiveness of the extra-high voltage direct-current post composite insulator of built-in electrode structure of the present invention is excellent, the homogenizing of post insulator high-pressure side Electric Field Distribution can be realized to greatest extent, particularly reduce the high field intensity of insulator end gold utensil, plug and composite sheath interface significantly, inhibit the on high-tension side corona of post insulator and galvanic corrosion to damage, effectively improve the reliability of insulator.
That is, the present invention effectively can reduce the electric field strength of extra-high voltage direct-current post composite insulator high-pressure side, make post insulator axially along face Electric Field Distribution homogenizing, inhibit the corona discharge of composite insulator and galvanic corrosion to damage, improve extra-high voltage direct-current post composite insulator reliability of operation.
Accompanying drawing explanation
Fig. 1 is the structural representation of a specific embodiment of the present invention.
Fig. 2 is inner shield electrode structure shape of the present invention.
Fig. 3 is that extra-high voltage direct-current post composite insulator end has inner shield electrode and the insulator surface axial electric field distribution curve without inner shield electrode.In figure, square frame point trace is the simulation result without inner shield electrode, and continuous circular line is the simulation result having inner shield electrode.
Reference numeral:
1, the 2 large shading rings in first segment insulator top, high-pressure side,
The large shading ring of 3 high-pressure side first segment insulator tail end,
4,5 little shading rings, 6 inner shield electrodes.
Embodiment
Below in conjunction with accompanying drawing and embodiment, content of the present invention is described further, but the structure of actual product of the present invention is not limited in following embodiment.
Fig. 1 is a kind of embodiment of the present invention, based on the post composite insulator with interior electrode 6, at post composite insulator high-pressure side first segment top flange, large shading ring 1 and 2 is respectively installed up and down, large shielding ring diameter 1,2 is 1000mm-2000mm, tube section diameter is that 120mm-300mm(shading ring itself is formed by metal tube), large shading ring 1 central plane is 100-500mm apart from the distance of flange upper surface, and large shading ring 2 central plane is 100-500mm apart from the distance of flange lower surface.Save near insulator flange at post composite insulator high-pressure side one or two and large shading ring 3 is installed, large shading ring 3 can be arranged on flange top or bottom, the distance of ring central plane distance flange median plane is 0-500mm, large shielding ring diameter 3 is 1000mm-2000mm, and tube section diameter is 120mm-300mm.A little shading ring 4 is installed a little less than flange in first segment insulator top, high-pressure side, and its flange upper surface, plane separation top, center distance is 50-200mm; High-pressure side first segment insulator tail end installs a little shading ring 5 a little more than flange, and its plane separation flange at tail end lower surface, center distance is 50-200mm.Little shading ring 4,5 diameter is 400-800mm, and tube section diameter is 40-100mm.Shading ring is metal material, by support installing on flange (support is also metal material).Like this by the low electric field region that equipotential shading ring and inner shield electrode are formed, effectively reduce the electric field strength of extra-high voltage direct-current post composite insulator high-pressure side, avoid causing partial discharge and galvanic corrosion to damage.
Composite insulator of the present invention is a kind of extra-high voltage direct-current post composite insulator be made up of interior electrode, composite sheath, solid mandrel (or cannulated sleeve) and end profile shielding ring.Wherein, composite sheath mainly refers to elastomeric material at present, be set in the outside of solid mandrel or cannulated sleeve, solid mandrel mainly contains epocel plug and porcelain core rod, and cannulated sleeve mainly contains epoxy cannulated sleeve and porcelain cannulated sleeve (insulating material all can do cannulated sleeve).The length of extra-high voltage direct-current post composite insulator is preferably 11m-18m, and first segment insulator both ends, high-pressure side are provided with inner shield electrode, and inner shield electrode is metal material (as aluminium alloy).Inner shield electrode is respectively in the solid mandrel of first segment insulator top, embedding high-pressure side and tail end or cannulated sleeve.One end of two inner shield electrodes and end part of composite insulator Flange joint, the other end stretches in plug or in Hollow Compound sleeve.Fig. 2 is the typical inner shield electrode of the present invention, ring-type or column, end rounding.The length of inner shield electrode is preferably 60-200mm.
The connected mode of inner shield electrode and flange and plug: then inner shield electrode can be connected by mucilage binding with plug for single-casting once-forming with flange; Also can in plug manufacture process first by inner shield electrode embed, then by screw rod by flange and inner shield Electrode connection, flange and plug still adopt mucilage binding to be connected.In a word, need to ensure that inner shield electrode and flange have reliable electrical connection.
Composite insulator of the present invention is for (such as ± more than 800kV, particularly ± 1100kV) in extra-high voltage direct-current transmission engineering, can support the rod-shaped pillar composite insulator of the high-tension apparatuses such as smoothing reactor, bus and switch.Can use by single-column, also can use by multicolumn.Its mounting means is at right angle setting or tilts to install.These are all depending on actual conditions.
Fig. 3 is extra-high voltage direct-current post composite insulator without inner shield electrode with have the insulator under inner shield electrode axially along face distribution map of the electric field (so-called insulator axial length refers to the distance of distance insulator high-pressure side).Described in figure without the insulator axial electric field distribution curve (square frame point trace) during inner shield measure and use the insulator axial electric field distribution curve (continuous circular line) having an inner shield electrode of the present invention relatively, adopt the present invention to significantly improve the Electric Field Distribution of insulator, greatly reduce the on high-tension side electric field strength of insulator.Illustrate adopt extra-high voltage direct-current post composite insulator inner shield electrode of the present invention and shading ring configuration be improve insulator along face Electric Field Distribution, reduce the very effective measure that insulator high-pressure side local field strength too concentrates.
Claims (10)
1. an extra-high voltage direct-current post composite insulator, it comprises: more piece insulator, inner shield electrode and multiple shading ring, is characterized in that,
Linked together by spacer flanger between two joint insulators adjacent in more piece insulator,
First segment insulator is called near the insulator of high-pressure side in more piece insulator,
The top of first segment insulator is provided with top flange,
Described spacer flanger is provided with between the tail end and the top of second section insulator of first segment insulator,
Be separately installed with shading ring in a distance separately apart from described top flange and described spacer flanger, described shading ring comprises:
First shading ring, to be arranged on the flange of described top, with described top flange equipotential;
Secondary shielding ring, to be arranged under the flange of described top, with described top flange equipotential;
3rd shading ring, to be arranged on the spacer flanger between first segment insulator and second section insulator or under, with this spacer flanger equipotential;
4th shading ring, to be arranged between described top flange and described secondary shielding ring and under the flange of top, with described top flange equipotential;
5th shading ring, to be arranged on the spacer flanger between first segment insulator and second section insulator, with this spacer flanger equipotential;
Described inner shield electrode comprises the first inner shield electrode and the second inner shield electrode,
Described first inner shield electrode is arranged on the top of described first segment insulator,
Described second inner shield electrode is arranged on the tail end of described first segment insulator,
One end of described first inner shield electrode and described top Flange joint, the other end extends in described first segment insulator,
One end of described second inner shield electrode is connected with described spacer flanger, and the other end extends in described first segment insulator.
2. extra-high voltage direct-current post composite insulator as claimed in claim 1, is characterized in that,
Described shading ring, described first inner shield electrode, described second inner shield electrode, described top flange and described spacer flanger are metal material,
Described first inner shield electrode and described top flange are electrically connected,
Described second inner shield electrode and described spacer flanger are electrically connected.
3. extra-high voltage direct-current post composite insulator as claimed in claim 2, is characterized in that,
Described first shading ring is by support installing 100-500mm place on the flange of described top;
Described secondary shielding ring is by support installing 100-500mm place under the flange of described top;
Described 3rd shading ring by the spacer flanger of support installing between first segment insulator and second section insulator or under 0-500mm place.
4. extra-high voltage direct-current post composite insulator as claimed in claim 3, is characterized in that,
Described 4th shading ring to be arranged between described top flange and described secondary shielding ring and under the flange of top 50-200mm place;
Described 5th shading ring is by 50-200mm place on the spacer flanger of support installing between first segment insulator and second section insulator;
The length of first, second inner shield electrode described is 60-200mm.
5. extra-high voltage direct-current post composite insulator as claimed in claim 4, is characterized in that,
Described first, second, third shading ring diameter is 1000mm-2000mm, and tube section diameter is 120mm-300mm,
Described 4th, the 5th shading ring diameter is 400-800mm, and tube section diameter is 40-100mm.
6. extra-high voltage direct-current post composite insulator as claimed in claim 1, is characterized in that, comprising:
Described more piece insulator is the composite jacket pillar insulator be made up of composite sheath and cannulated sleeve or composite sheath and solid mandrel,
Described composite sheath is set in the outside of described cannulated sleeve or described solid mandrel,
In the cannulated sleeve that described first inner shield electrode is embedded in described first segment insulator top or solid mandrel,
In the cannulated sleeve that described second inner shield electrode is embedded in described first segment insulator tail end or solid mandrel.
7. extra-high voltage direct-current post composite insulator as claimed in claim 6, is characterized in that:
The structure of described first inner shield electrode and described second inner shield electrode is ring-type or column, extends to the end rounding in described first segment insulator.
8. extra-high voltage direct-current post composite insulator as claimed in claim 1, is characterized in that:
The length of first, second inner shield electrode described is 60-200mm.
9. extra-high voltage direct-current post composite insulator as claimed in claim 6, is characterized in that:
Then described first inner shield electrode is connected by mucilage binding with described solid mandrel by single-casting once-forming with described top flange,
Then described second inner shield electrode is connected by mucilage binding with described solid mandrel by single-casting once-forming with described spacer flanger.
10. extra-high voltage direct-current post composite insulator as claimed in claim 6, is characterized in that:
First described first inner shield electrode and described second inner shield electrode are embedded in solid mandrel manufacture process, then by screw rod by described top flange and described first inner shield Electrode connection, by described spacer flanger and described second inner shield Electrode connection, described top flange and described spacer flanger are connected respectively by employing mucilage binding and are connected with described solid mandrel.
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN206116175U (en) * | 2016-08-22 | 2017-04-19 | 江苏智达高压电气有限公司 | Special high voltage direct current transformer bushing |
| CN110534273A (en) * | 2019-08-23 | 2019-12-03 | 无锡爱邦辐射技术有限公司 | Partial pressure type high-voltage insulation strut |
| CN111368824B (en) * | 2020-02-24 | 2022-09-23 | 河海大学常州校区 | Instrument identification method, mobile device and storage medium |
| CN115910501A (en) * | 2022-11-30 | 2023-04-04 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Optical fiber insulator and current measuring device |
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