CN112002501B - Device for preventing outdoor insulator from raining flashover and verification method - Google Patents
Device for preventing outdoor insulator from raining flashover and verification method Download PDFInfo
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- CN112002501B CN112002501B CN202010610463.5A CN202010610463A CN112002501B CN 112002501 B CN112002501 B CN 112002501B CN 202010610463 A CN202010610463 A CN 202010610463A CN 112002501 B CN112002501 B CN 112002501B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/38—Fittings, e.g. caps; Fastenings therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1245—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of line insulators or spacers, e.g. ceramic overhead line cap insulators; of insulators in HV bushings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/42—Means for obtaining improved distribution of voltage; Protection against arc discharges
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Abstract
The invention provides a device for preventing an outdoor insulator from a heavy rainfall flashover, which comprises a separating umbrella arranged on the insulator, wherein the separating umbrella comprises a first annular plate and a first connecting piece, a first notch is formed in the first annular plate, the first annular plate is conveniently sleeved on the insulator by arranging the first notch, and the separating umbrella is laid on an umbrella skirt of the insulator; the first connecting piece is arranged at the first notch of the first annular plate, so that the notch of the first annular plate is connected into a closed circular ring, and the first annular plate is fixed on the insulator. The invention has the beneficial effects that the anti-creeping umbrella is arranged on the insulator, so that the creepage distance of the insulator is effectively increased, the wetting process of the insulator is influenced, the continuity of the rain curtain is reduced, the development of the discharging process is hindered, the conductive capability of rainwater is reduced, the problem of flashover of the outdoor insulator caused by rain is effectively prevented, and the safety performance of the insulator is ensured.
Description
Technical Field
The invention relates to the technical field of high-voltage equipment protection, in particular to a device for preventing outdoor insulator from raining flashover and a verification method.
Background
At present, outdoor insulators of high-voltage equipment of transformer substations or converter stations are required to reliably operate under atmospheric overvoltage, internal overvoltage and long-term operation voltage, especially under special climates or conditions such as heavy rain, ice coating, high altitude and the like. The electrical strength of the insulator can be greatly reduced under extreme climatic conditions, and the external insulation of a power system can be subjected to flashover under the action of overvoltage, so that power failure accidents are caused, and the industrial production and the economic and social development are influenced. In recent years, in China, the station external insulation of the transformer station and the converter station has been subjected to heavy rainfall flashover accidents for many times, and the rainfall flashover has gradually become an important threat for the safe operation of the power system, and enough attention should be paid. The reason is that the appearance design of the insulator is unreasonable, only the anti-pollution flashover performance is considered, and the traditional anti-pollution flashover performance design is mainly determined by the creepage distance, and the distance between umbrellas is smaller, so that the requirement of rain flashover prevention cannot be met. Therefore, an anti-flashover device is urgently needed to reduce and avoid the damage to the power system caused by the rain flashover accident of the outdoor insulator of the high-voltage equipment,
disclosure of Invention
In view of the above, the invention provides a device and a verification method for preventing flashover of an outdoor insulator due to heavy rainfall, and aims to solve the problem of flashover of the outdoor insulator due to rain.
In one aspect, the invention provides a device for preventing an outdoor insulator from a heavy rainfall flashover, which comprises a separating umbrella arranged on the insulator, wherein the separating umbrella comprises a first annular plate and a first connecting piece, a first notch is arranged on the first annular plate, the first annular plate is conveniently sleeved on the insulator by arranging the first notch, and the separating umbrella is laid on an umbrella skirt of the insulator; the first connecting piece is arranged at the first notch of the first annular plate, so that the notch of the first annular plate is connected into a closed circular ring, and the first annular plate is fixed on the insulator.
Further, the first notch is provided along a diameter direction of the first annular plate.
Furthermore, a clamping groove is formed in the first annular plate, a protrusion is arranged on the first connecting piece, and the clamping groove and the protrusion are arranged oppositely, so that the first connecting piece and the first annular plate are clamped together.
Furthermore, a plurality of annular bulges and annular grooves are arranged on the first annular plate and are uniformly and alternately arranged along the circumferential direction of the first annular plate.
Furthermore, a plurality of arc-shaped grooves and arc-shaped bulges are arranged on the first connecting piece, the arc-shaped grooves and the arc-shaped bulges are arranged along the uniform alternate arrangement in the direction of the central axis of the first connecting piece, and the arc-shaped grooves and the arc-shaped bulges are respectively opposite to the annular bulges and the annular grooves.
Further, a second annular plate is arranged on the lower side of the first annular plate, the outer edge of the second annular plate is connected with the middle of the first annular plate to form an accommodating cavity, and the accommodating cavity is used for accommodating the umbrella skirt of the insulator, so that the umbrella skirt of the insulator is sleeved in the accommodating cavity.
Furthermore, a second notch is formed in the second annular plate and connected with a second connecting piece.
Compared with the prior art, the invention has the beneficial effects that the anti-creeping umbrella is arranged on the insulator, so that the creepage distance of the insulator is effectively increased, the wetting process of the insulator is influenced, the continuity of a rain curtain is reduced, the development of a discharging process is hindered, the conductive capability of rainwater is reduced, the problem of flashover of the outdoor insulator caused by rain is effectively prevented, and the safety performance of the insulator is ensured.
On the other hand, the invention also provides a verification method for the outdoor insulator heavy rainfall flashover prevention, which is implemented by adopting the device for the outdoor insulator heavy rainfall flashover prevention and comprises the following steps:
arranging two groups of insulators, and arranging a separating umbrella on one group of the insulators;
respectively carrying out a rain test on the two groups of insulators, and acquiring rain flashover voltages of the two groups of insulators;
and respectively determining the maximum withstand voltage of each group of insulators according to the rain flashover voltage.
Furthermore, the group of insulators provided with the umbrella isolation structure comprises a plurality of sub-insulators, different numbers of the umbrella isolation structures are arranged on the sub-insulators respectively, and the withstand voltage of each sub-insulator is determined.
Further, a direct current or alternating current rain test was performed under a typical rainfall by a pressurization method of a constant pressure elevation method.
Therefore, the effectiveness of the umbrella isolation is verified by performing a rain test on the insulator provided with the umbrella isolation and the insulator not provided with the umbrella isolation and determining the withstand voltage of each insulator, so that the safety of the insulator is improved.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a top view structural view of a umbrella partition provided in an embodiment of the present invention;
FIG. 2 is a schematic view of the installation of a umbrella of the present invention;
FIG. 3 is a sectional view of a portion of a first annular plate according to an embodiment of the present invention;
FIG. 4 is a flowchart of a verification method for outdoor insulator flashover protection against heavy rainfall according to an embodiment of the present invention;
FIG. 5 shows the lightning voltage of the bushing insulator with different spacing umbrellas according to the embodiment of the present invention;
fig. 6 shows the rain flash voltage of the porcelain posts installed with different spacing umbrellas according to the embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1, the embodiment provides a device for preventing flashover of an outdoor insulator due to heavy rainfall, which comprises a separating umbrella arranged on the insulator, wherein the separating umbrella comprises a first annular plate 1 and a first connecting piece 2, a first notch 8 is arranged on the first annular plate 1, the first annular plate 1 is conveniently sleeved on the insulator 10 by arranging the first notch 8, and the separating umbrella is laid on an umbrella skirt of the insulator 10; the first connecting piece 2 is arranged at the first gap 8 of the first annular plate 1, so that the gap of the first annular plate 1 is connected into a closed circular ring, and the first annular plate 1 is fixed on the insulator 10.
Specifically, the first annular plate 1 is a circular plate-shaped structure, and a gap is opened on the plate surface thereof, so as to facilitate the installation of the first annular plate 1 on the insulator 10.
Specifically, the first notch 8 is provided along a diameter direction of the first annular plate 1, that is, a notch is opened along an extension direction of one of a diameter line or a radius line of the first annular plate 1 to form the first notch 8.
Preferably, the first notch 8 and the first connecting member 2 are oppositely arranged in a trapezoidal structure, that is, the cross-sectional shapes of the first notch 8 and the first connecting member 2 are trapezoidal.
It is understood that the first notch 8 and the first connecting member 2 may also be rectangular or circular, and the specific structure of the first notch 8 and the first connecting member 2 may be set according to the actual situation.
It can be seen that through setting up the umbrella on insulator 10, the effectual creepage distance that increases insulator 10 influences the moist process of insulator 10, has reduced the continuity of rain curtain, hinders the development of discharge process, has reduced the conducting capacity of rainwater, and the effectual problem that prevents outdoor insulator 10 from causing the flashover because of drenching with rain takes place, has guaranteed the security performance of insulator 10.
With reference to fig. 1 and 2, specifically, a clamping groove 3 is formed in the first annular plate 1, a protrusion 4 is formed in the first connecting member 2, and the clamping groove 3 is opposite to the protrusion 4, so that the first connecting member 2 is clamped to the first annular plate 1.
Specifically, the clamping groove 3 is preferably a cylindrical groove and is respectively arranged on the first annular plate 1 at the four corners of the first notch 8; protruding 4 is preferably a cylinder type protruding mechanism, and protruding 4 sets up in the four corners position of first connecting piece 2, and it sets up with joint groove 3 relatively to make joint groove 3 and protruding 4 can firmly be in the same place the joint. It is also possible to provide the first annular plate 1 with a protrusion 4 and the first connecting member 2 with a locking groove 3.
Specifically, the first annular plate 1 and the first connecting member 2 are each a plate-shaped structure made of an insulating material. Preferably, the first annular plate 1 and the first connecting member 2 are preferably made of a soft insulating material so that the first annular plate 1 and the first connecting member 2 can have a certain amount of deformation so that they can be effectively brought into contact with the insulator 10 to be connected together.
Specifically, as shown in fig. 3, the first annular plate 1 is provided with a plurality of annular protrusions 7 and annular grooves 6, the annular protrusions 7 and the annular grooves 6, and the plurality of annular protrusions 7 and the annular grooves 6 are arranged in an even and alternating manner along the circumferential direction of the first annular plate 1.
Specifically, a plurality of arc grooves and arc protrusions are arranged on the first connecting piece 2, the arc grooves and the arc protrusions are arranged in an even alternate arrangement mode along the central axis direction of the first connecting piece 2, and the arc grooves and the arc protrusions are arranged opposite to the annular protrusions 7 and the annular grooves 6 respectively.
Specifically, the annular protrusion 7 and the annular groove 6 are disposed opposite to the arc-shaped groove and the arc-shaped protrusion, respectively, so that after the first annular plate 1 and the first connecting member 2 are connected, the annular protrusion 7 and the arc-shaped protrusion form a closed circular protrusion structure, and the annular groove 6 and the arc-shaped groove form a closed circular groove structure. The annular bulges 7 and the annular grooves 6 as well as the arc-shaped grooves and the arc-shaped bulges are respectively and evenly arranged in an alternating way.
It can be seen that the creepage distance of the upper side surface of the first annular plate 1 can be increased by arranging the annular protrusion 7, the annular groove 6, the arc-shaped groove and the arc-shaped protrusion, so that the safety performance of the insulator 10 can be effectively ensured.
Specifically, the first annular plate 1 is preferably connected to the shed of the insulator 10 by bonding, that is, the first annular plate 1 is connected to the shed of the insulator 10 by an adhesive, and the first annular plate 1 may be connected to the shed of the insulator 10 by clipping.
Specifically, the width of the first annular plate 1 is set according to the width of the insulator shed 11, and the width of the first annular plate 1 is greater than the width of the insulator shed 11, preferably, the width of the first annular plate 1 is at least 50mm greater than the width of the insulator shed 11, that is, the difference in width between the first annular plate 1 and the insulator shed 11 is at least 50mm, and it can be understood that the first annular plate 1 covers the insulator shed 11, and the first annular plate 1 extends at least 50mm above the insulator shed 11.
Specifically, a second annular plate is arranged on the lower side of the first annular plate 1, the outer edge of the second annular plate is connected with the middle of the first annular plate 1 to form a containing cavity, and the containing cavity is used for containing the shed of the insulator 10, so that the shed of the insulator 10 is sleeved in the containing cavity. Specifically, a first annular plate 1 and a second annular plate are coaxially arranged, the outer edge of the second annular plate is connected with the middle of the first annular plate 1, and a preset interval is kept between the inner side edges of the first annular plate 1 and the second annular plate, so that a gap is formed between the two, namely the accommodating space.
Specifically, a second notch is formed in the second annular plate and connected with the second connecting piece. The second gap is arranged opposite to the first gap 8, so that the installation is convenient.
Specifically, the second connecting piece and the second notch are connected together in a clamping manner, so that the second annular plate forms a closed annular structure.
Specifically, the insulator shed 11 is clamped in the accommodating space between the first annular plate 1 and the second annular plate, that is, the first annular plate 1 and the second annular plate are sleeved on the insulator shed 11, and preferably, the first annular plate 1 and the second annular plate are connected with the insulator shed 11 in a bonding manner.
Specifically, the insulator 10 may be a porcelain post, a bushing insulator, or the like.
Specifically, one or more of the umbrella spacers may be provided, and the plurality of umbrella spacers are respectively provided on the skirts of the insulators 10, so that the capability of the insulators 10 against flashover of rainwater is improved.
In specific implementation, the umbrella is mounted on the insulator shed 11 in two ways, namely, in a sheet mounting mode and a coating mounting mode, wherein the sheet mounting mode is that only the first annular plate 1 is arranged, is bonded and fixed with the insulator shed 11 through an adhesive, and is tightly attached to the insulator shed 11; the cladding type installation is to set up first annular slab 1 and second annular slab simultaneously to the cover is established on insulator full skirt 11, and first annular slab 1 and second annular slab bond together through the adhesive between 11 with insulator full skirt.
Specifically, the insulator umbrella skirt 11 certain distances are stretched out to the umbrella that separates of installing additional, and the insulator separates the effect that the umbrella can play isolated rain curtain at the in-process that drenches with rain, at the in-process that discharges, can increase certain creepage distance, separates the electrically conductive ability that the umbrella has reduced the rainwater through setting up, not only can prevent effectively that the insulator from drenching with rain after flashover, still greatly improved the security performance of insulator.
In another preferred implementation mode based on the above embodiment, this implementation mode provides a method for verifying the flashover of the outdoor insulator against the heavy rainfall, and the method is implemented by using the above device for flashover of the outdoor insulator against the heavy rainfall.
Referring to fig. 4, the method for verifying the flashover of the outdoor insulator against heavy rainfall in the embodiment includes the following steps:
step one, S101: arranging two groups of insulators, and arranging an umbrella on one group of insulators;
step two S102: respectively carrying out rain tests on the two groups of insulators, and acquiring rain flashover voltages of the two groups of insulators;
step three, S103: and respectively determining the maximum withstand voltage of each group of insulators according to the rain flashover voltage.
Specifically, the feasibility of arranging the umbrella isolation structure on the insulator to prevent the insulator from being subjected to rain flashover is verified according to the maximum withstand voltage of each group of insulators.
Specifically, a group of insulators provided with the umbrella separating bodies comprises a plurality of sub-insulators, the umbrella separating bodies with different numbers are arranged on the sub-insulators respectively, and the withstand voltage of each sub-insulator is determined.
Specifically, a direct current or alternating current rain test is performed under a typical rainfall by a pressurization method of a constant pressure elevation method.
It can be understood that the method of the embodiment starts from the reduction of the electric conductivity of rainwater, and improves the strong rainfall flashover prevention capacity of the outdoor insulator by adding the auxiliary isolating umbrella on the outdoor insulator. Specifically, after the auxiliary separating umbrella is added, the creepage distance of the insulator is increased, the wetting process of the insulator is influenced, the continuity of the rain curtain is reduced, the development of the discharging process is hindered, and the conductivity of rainwater is reduced.
Specifically, the method is classified from the mechanism of rain flashover, conventional heavy rainfall flashover prevention measures can be divided into two types of horizontal uneven rain flashover and vertical even rain flashover protection measures, and the method of the embodiment starts with the reduction of the rainwater conductivity and prevents the insulator from flashover along the surface by arranging the umbrella. Further, the method of the embodiment is implemented for vertical uniform rain flashing, and the vertical uniform rain flashing can be effectively prevented by additionally arranging the separation umbrella on the insulator.
Specifically, the method of the present embodiment can increase the external insulation rain flashover voltage of the porcelain post or the bushing insulator by attaching the umbrella to the porcelain post or the bushing insulator without changing the structural height of the insulator.
Specifically, the umbrella isolation is of a typical umbrella shape, and a porcelain pillar or a sleeve insulator with a typical structure height is used for performing an umbrella isolation test under a typical salt density/ash density condition, and a certain number of umbrella isolation devices are additionally arranged on a preset number of insulators to perform a heavy rain flashover test, so that the rain flashover characteristic of the umbrella isolation device is obtained.
Specifically, the umbrella is mounted on the shed of the porcelain pillar or the sleeve insulator in two modes, namely, sheet mounting and coating mounting, and is bonded and fixed with the shed through an adhesive and tightly attached to the shed. The shape of the umbrella separating umbrella is different from that of a conical sleeve or a transformer sleeve, but the distance between the umbrellas and the extension of the umbrellas are the same or similar, and the umbrella separating umbrella belongs to a dense skirt structure. When the specific value of flashover voltage of the power equipment under heavy rain is not required to be obtained, and the forming mechanism of the rain flashover and the effect of the auxiliary umbrella skirt on preventing the rain flashover are researched, the relevant experimental research is completely feasible by using the test article.
Specifically, the umbrella skirt of the additional umbrella extends out a certain distance, and the certain distance is longer than the umbrella skirt of the original strut or sleeve. In the rain process, the isolating umbrella can play a role of isolating the rain curtain, and certain creepage distance can be increased in the discharging process.
Specifically, in order to increase the influence of umbrellas with different intervals on the rain and lightning voltage characteristics of the insulator, a certain number of composite auxiliary umbrella skirts are additionally arranged on the porcelain strut or the sleeve insulator respectively. During the test, the pillar or sleeve insulator with the structure height kept unchanged is subjected to a direct current or alternating current rain test under typical rainfall. The rain flashover test can be carried out in a manual climate tank of a dirty and environmental climate test room, and the rain flashover voltage of the insulators additionally provided with different numbers of auxiliary sheds is obtained and compared by adopting a pressurizing mode of a constant voltage lifting method (a 50% withstand voltage method).
It can be understood that the method of the embodiment has the characteristics of simple installation and obvious effect, and is an effective measure for preventing the heavy rainfall flashover of the outdoor insulator: the umbrella can obviously improve the maximum withstand voltage of the support post or the sleeve. The method provides a new solution for preventing the heavy rainfall flashover of the outdoor insulator of the high-voltage equipment of the transformer substation or the converter station. Simultaneously, through install the technical scheme who separates the umbrella additional on current outdoor equipment design basis be economy, convenient and effectual, make outdoor insulator heavy rainfall flashover voltage show and promote, and no obvious influence to the internal insulation.
The method of the embodiment is carried out in an artificial climate tank of an extra-high voltage direct current test base pollution and environmental climate test room, and is implemented in a mode that a separation umbrella is additionally arranged on a porcelain post insulator. The insulator adopts a porcelain post insulator with a typical umbrella-shaped structure (one large, one medium and one small) height (4.2 m) in salt density/ash density (0.05 mg/cm) 2 /1.0mg/cm 2 ) Under the conditions of (1) respectively carrying out a heavy rain flashover test without an auxiliary separating umbrella, additionally arranging 4 separating umbrellas and 8 separating umbrellas to obtain the rain flashover characteristics of the umbrellas.
A test article for installing an auxiliary umbrella is additionally provided, an umbrella-shaped porcelain post insulator is adopted, and an auxiliary umbrella isolating shed is a composite shed. The composite umbrella skirt is made of silicon rubber material, and is adhered and fixed with the large umbrella skirt by an adhesive by adopting a coating type installation method, and no gap is left between the composite umbrella skirt and the large umbrella. The extension of the auxiliary umbrella separating umbrella is increased by 100mm compared with the extension of the original ceramic chip umbrella, 8, 4 and 0 composite auxiliary umbrella skirt are respectively arranged on the ceramic post insulator, each post is 2, and the auxiliary umbrella separating parameters and the installation conditions are shown in table 1. During the test, 2 same post insulators are superposed to perform a direct current rain test under the rainfall of 5 mm/min.
TABLE 1 auxiliary shed test conditions for different shed spacings
In the rain test, the average diameter was adjusted to eliminate the influence of the average diameter on the result of the rain flashover voltage, and the test result was corrected to have a uniform average diameter, and the test voltage and the test data after correction are shown in table 2.
TABLE 2 rain test results after correction of different spacing umbrella stand
It can be seen from table 2 that the 50% flashover voltages of the 4-piece and 8-piece post insulators are 7.4% and 30.6% higher than those of the porcelain post without the auxiliary umbrella, respectively. A certain number of auxiliary separating umbrellas are additionally arranged, particularly when the number of the auxiliary separating umbrellas reaches 8 and the spacing between the auxiliary separating umbrellas is not more than 442mm, the 50% rain-proof lightning voltage of the post insulator can be greatly improved, so that the auxiliary umbrella separating frames with a certain number are additionally arranged, and the withstand voltage of the post insulator in a rain state can be effectively improved.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (7)
1. A device for preventing the flashover of the outdoor insulator caused by the heavy rainfall is characterized by comprising a separation umbrella arranged on the insulator, wherein the separation umbrella comprises a first annular plate and a first connecting piece, a first notch is formed in the first annular plate, the first annular plate is conveniently sleeved on the insulator through the first notch, and the separation umbrella is laid on an umbrella skirt of the insulator; the first connecting piece is arranged at the first notch of the first annular plate, so that the notch of the first annular plate is connected into a closed circular ring, and the first annular plate is fixed on the insulator;
the first annular plate is provided with a plurality of annular bulges and annular grooves which are uniformly and alternately arranged along the circumferential direction of the first annular plate;
the first connecting piece is provided with a plurality of arc grooves and arc bulges, the arc grooves and the arc bulges are arranged along the uniform alternate arrangement in the direction of the central axis of the first connecting piece, and the arc grooves and the arc bulges are respectively opposite to the annular bulges and the annular grooves.
2. The device of claim 1, wherein the first notch is located along a diameter of the first annular plate.
3. The device for outdoor insulator protection against rainfall flashover of claim 1, wherein the first annular plate is provided with a clamping groove, the first connecting member is provided with a protrusion, and the clamping groove is arranged opposite to the protrusion, so that the first connecting member and the first annular plate are clamped together.
4. The device for outdoor insulator flashover protection against heavy rainfall according to any one of claims 1 to 3, wherein a second annular plate is arranged on the lower side of the first annular plate, and the outer edge of the second annular plate is connected with the middle part of the first annular plate to form a containing cavity for containing the shed of the insulator, so that the shed of the insulator is sleeved in the containing cavity.
5. The device for outdoor insulator flashover in heavy rainfall event according to claim 4, wherein the second annular plate is provided with a second notch, and the second notch is connected to the second connecting member.
6. A method for verifying rainstorm flashover prevention of an outdoor insulator, which is implemented by using the device for rainstorm flashover prevention of an outdoor insulator according to any one of claims 1 to 5, and comprises the following steps:
arranging two groups of insulators, and arranging an umbrella on one group of insulators;
respectively carrying out a rain test on the two groups of insulators, and acquiring rain flashover voltages of the two groups of insulators;
respectively determining the maximum withstand voltage of each group of insulators according to the rain flashover voltage;
verifying the feasibility of arranging an umbrella on the insulator to prevent the insulator from being subjected to rain flashover according to the maximum withstand voltage of each group of insulators;
the group of insulators provided with the umbrella separation structure comprises a plurality of sub-insulators, wherein the sub-insulators are respectively provided with different numbers of umbrella separation structures, and the withstand voltage of each sub-insulator is determined.
7. The method for verifying the flashover of the outdoor insulator against the heavy rainfall as claimed in claim 6, wherein the direct current or alternating current rain test is performed under the typical rainfall by a pressurization mode of a constant voltage lifting method.
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| US5637831A (en) * | 1990-11-06 | 1997-06-10 | Hydro Quebec | Electrical insulators |
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| CN201918234U (en) * | 2010-12-29 | 2011-08-03 | 广东电网公司电力科学研究院 | Insulating bushing for 500KV main transformer |
| CN203055571U (en) * | 2012-12-01 | 2013-07-10 | 国家电网公司 | Large creep distance antifouling insulator |
| CN106353644A (en) * | 2016-07-25 | 2017-01-25 | 国家电网公司 | Testing device and method for studying influence of rainfall of dusty weather on electronic puncture voltage |
| CN206259218U (en) * | 2016-12-15 | 2017-06-16 | 河北硅谷化工有限公司 | External insulation aids in full skirt |
| CN107545962A (en) * | 2017-08-31 | 2018-01-05 | 江苏神马电力股份有限公司 | A kind of umbrella cover |
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