CN206388574U - Parallel connection clearance device for porcelain insulator lightning protection - Google Patents
Parallel connection clearance device for porcelain insulator lightning protection Download PDFInfo
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- CN206388574U CN206388574U CN201621335817.5U CN201621335817U CN206388574U CN 206388574 U CN206388574 U CN 206388574U CN 201621335817 U CN201621335817 U CN 201621335817U CN 206388574 U CN206388574 U CN 206388574U
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- 239000012212 insulator Substances 0.000 title claims abstract description 88
- 229910052573 porcelain Inorganic materials 0.000 title claims abstract description 77
- 238000010891 electric arc Methods 0.000 claims abstract description 30
- 230000005540 biological transmission Effects 0.000 claims description 18
- 210000005069 ears Anatomy 0.000 claims description 4
- 210000000078 claw Anatomy 0.000 claims description 2
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims 2
- 230000033001 locomotion Effects 0.000 abstract description 9
- 230000002633 protecting effect Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 description 4
- 208000025274 Lightning injury Diseases 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 241000594310 Randia aculeata Species 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- APTZNLHMIGJTEW-UHFFFAOYSA-N pyraflufen-ethyl Chemical compound C1=C(Cl)C(OCC(=O)OCC)=CC(C=2C(=C(OC(F)F)N(C)N=2)Cl)=C1F APTZNLHMIGJTEW-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model is that, on a kind of parallel connection clearance device for porcelain insulator lightning protection, the parallel connection clearance device includes：It is fixedly arranged on the upper gap electrode of porcelain insulating substring upper end；It is fixedly arranged on the lower gap electrode of the porcelain insulating substring lower end；And it is connected to the grading ring of the porcelain insulating substring between the upper gap electrode and the lower gap electrode.The technical solution of the utility model can reduce the motion complexity of power frequency continued flow electric arc, reduce the situation that electric arc is run to porcelain insulator surface, improve the success rate of dredging to electric arc, improve the protecting effect to porcelain insulating substring.
Description
Technical Field
The utility model relates to a transmission line lightning protection technical field especially relates to a parallelly connected gap device for porcelain insulator lightning protection.
Background
An overhead transmission line is a power transmission line that is installed on the ground and insulated from the air by an insulator. As a main way of long-distance high-voltage power transmission, overhead power transmission lines are often exposed to the atmospheric environment and are susceptible to meteorological conditions, for example, the overhead power transmission lines are susceptible to lightning strikes under lightning weather conditions. If the overhead transmission line is struck by lightning, an insulator in the line is subjected to flashover, so that tripping is caused, and long-time power supply interruption is caused; after the insulator flashover happens, the voltage between the upper electrode and the lower electrode can be rapidly reduced to zero or approach to zero, and the surface of the insulator can be locally overheated to cause carbonization due to sparks or electric arcs in a flashover channel, so that the insulating material on the surface of the insulator is damaged.
Porcelain insulators are often used in the prior art, and in order to protect the porcelain insulators from lightning, measures of parallel gaps are usually used in the prior art to avoid flashover of the porcelain insulators. The measure of the parallel gap is that a gap device is connected with the insulator in parallel on the overhead transmission line, so that the parallel gap is formed. The parallel gap is a dredging type lightning protection measure for the power transmission line, and can play a role in lightning receiving, power frequency electric arc transferring and dredging, uniform power frequency electric field and the like. Since the insulation strength of the parallel gap is lower than that of the insulator it protects, breakdown occurs between the upper and lower gap electrodes of the parallel gap first and a follow current arc is generated in case of lightning strike. The burning arc gradually moves to the arc burning point of the electrode along the gap electrode under the action of the magnetic field force generated by the short-circuit current and finally extinguishes. Because the existence of the parallel gap enables the electric arc generated by lightning stroke not to move towards the direction of the insulator, the purpose of protecting the insulator string on the transmission line can be achieved by arranging the parallel gap.
However, although the insulation distance is short-circuited by the upper and lower gap electrodes of the parallel gap, the impact discharge can be preferentially generated in the parallel gap, so as to achieve the purpose of protecting the insulator string, but the impact discharge can subsequently trigger the power-frequency follow current arc. The upper arc root and the lower arc root of the power-frequency follow current arc can stably move between the upper gap electrode and the lower gap electrode within a certain time, but the power-frequency follow current arc is complex in motion, the arc can possibly run to the surface of the insulator under the influence of factors such as wind power and the like, the success rate of dredging the arc by the parallel gap is not high, and the protection effect of the parallel gap on the insulator string is reduced.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides an in the embodiment provide a parallelly connected gap device for porcelain insulator lightning protection to solve the parallelly connected clearance among the prior art and not high to dredging the success rate of electric arc, reduce the technical problem to porcelain insulator's protecting effect.
In order to solve the technical problem, the embodiment of the utility model provides a following technical scheme:
according to the utility model discloses a first aspect provides a parallelly connected gap device for porcelain insulator lightning protection, include:
an upper end gap electrode fixedly arranged at the upper end of the porcelain insulator string;
a lower end gap electrode fixedly arranged at the lower end of the porcelain insulator string; and the number of the first and second groups,
and the grading ring is connected with the ceramic insulator string between the upper end gap electrode and the lower end gap electrode.
Preferably, the ratio of the distance between the grading ring and the upper end gap electrode and the distance between the grading ring and the lower end gap electrode is between 0.4 and 0.6 inclusive.
Preferably, the grading ring is clamped on a connecting rod between adjacent porcelain insulators in the porcelain insulator string through a clamp.
Preferably, the grading ring comprises two grading semi rings which are inserted into each other;
the jig includes: the connecting fixing rods are fixedly connected to the inner ring edge of each pressure equalizing semi-ring respectively; the two fastening semi-rings are fixedly connected with the connecting fixing rod respectively, two ends of each fastening semi-ring are connected with ring ears respectively, and threaded holes are formed in the corresponding positions of the ring ears of the two fastening semi-rings respectively.
Preferably, the parallel gap device for lightning protection of porcelain insulator further comprises:
and the two arc leads are fixed at the edge of the outer ring of the grading ring and are vertically arranged, and the arc leads are vertically aligned with the arcing points on the two sides of the upper end gap electrode.
Preferably, the distance between the edge of the grading ring and the central axis of the porcelain insulator string is greater than or equal to 30 cm.
Preferably, the line on which the porcelain insulator string is located is an overhead transmission line of 220kV or below, and the upper end gap electrode and the lower end gap electrode are both in a goat horn shape; or,
the line on which the porcelain insulator string is located is an overhead transmission line with voltage of more than 220kV, and the upper end gap electrode and the lower end gap electrode are both annular.
The embodiment of the utility model provides a technical scheme includes following beneficial effect: the grading ring is connected with the porcelain insulator string between the upper end gap electrode and the lower end gap electrode, so that the discharge distance between the upper end gap electrode and the lower end gap electrode is shortened, when lightning stroke generates power frequency follow current electric arc, the power frequency follow current electric arc is firstly conducted to the middle grading ring from the upper end gap electrode and then conducted to the lower end gap electrode from the grading ring, the movement distance of the power frequency follow current electric arc is shortened, long electric arc between the upper end gap electrode and the lower end gap electrode is converted into two sections of short electric arcs between the upper end gap electrode and the grading ring and between the grading ring and the lower end gap electrode, the movement complexity of the power frequency follow current electric arc is reduced, the possibility that the electric arc runs to the surface of the porcelain insulator string is reduced, the dredging success rate of the electric arc is improved, and the protection effect of the porcelain insulator string is improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.
Fig. 1 is a schematic structural diagram of a first porcelain insulator lightning protection parallel gap device provided in an embodiment of the present invention;
fig. 2 is a schematic structural view of an equalizing ring according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a parallel gap device for lightning protection of a second porcelain insulator according to an embodiment of the present invention.
The correspondence between the structures and the reference numerals in the embodiment shown in fig. 1 to 3 is as follows:
1-porcelain insulator string, 11-connecting rod, 2-upper end gap electrode, 3-lower end gap electrode, 4-grading ring, 41-grading semi-ring, 42-connecting fixing rod, 43-fastening semi-ring, 44-ring ear, 5-clamp and 6-arc lead.
Detailed Description
An embodiment of the utility model provides a parallelly connected gap device for porcelain insulator lightning protection for solve current parallelly connected clearance not high to dredging success rate of electric arc, reduced the problem to porcelain insulator's protecting effect.
In order to make the technical solutions in the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
The above is the core idea of the present invention, and in order to make the technical field personnel understand the scheme of the present invention better, the following is combined with the drawings to make further detailed description of the present invention.
Please refer to fig. 1, fig. 1 is a schematic structural diagram of a parallel gap device for lightning protection of a porcelain insulator according to an embodiment of the present invention, as shown in fig. 1, the parallel gap device for lightning protection of a porcelain insulator includes:
an upper end gap electrode 2 fixedly arranged at the upper end of the porcelain insulator string 1;
a lower end gap electrode 3 fixedly arranged at the lower end of the porcelain insulator string 1; and the number of the first and second groups,
and the grading ring 4 is connected with the porcelain insulator string 1 between the upper end gap electrode 2 and the lower end gap electrode 3.
By connecting the equalizing ring 4 on the porcelain insulator string 1 between the upper end gap electrode 2 and the lower end gap electrode 3, the long electric arc transmitted to the lower end gap electrode 3 by the original upper end gap electrode 2 can be converted into two sections of short electric arcs passing through the equalizing ring 4, so that the motion complexity of the long electric arc is avoided, the possibility of the electric arc running to the surface of the porcelain insulator string 1 is reduced, and the success rate of dredging the electric arc is improved. The upper end gap electrode 2 is a gap electrode close to one end of the tower, and the lower end gap electrode 3 is a gap electrode close to one end of the overhead conductor.
The embodiment of the utility model provides a parallel gap device for porcelain insulator lightning protection, through ceramic insulator chain 1 connection equalizer ring 4 between upper end clearance electrode 2 and lower extreme clearance electrode 3, thereby shortened the discharge distance between upper end clearance electrode 2 and lower extreme clearance electrode 3, when thunderbolt produces power frequency afterflow electric arc, power frequency afterflow electric arc can be at first conducted to equalizer ring 4 in the middle from upper end clearance electrode 2, then conduct to lower extreme clearance electrode 3 from equalizer ring 4, thereby shortened the movement distance of power frequency afterflow electric arc, make the long electric arc conversion between upper end clearance electrode 2 to lower extreme clearance electrode 3 for two sections short electric arcs between upper end clearance electrode 2 to equalizer ring 4 and equalizer ring 4 to lower extreme clearance electrode 3, thereby reduced the motion complexity of power frequency afterflow electric arc, reduce the possibility that electric arc runs to ceramic insulator chain 1 surface, thereby improving the success rate of dredging the electric arc and improving the protection effect on the porcelain insulator string 1.
In order to avoid the phenomenon that any one of the two divided short arcs is too long and causes the short arc to move towards the direction of the porcelain insulator string 1, the ratio of the distance between the grading ring 4 and the upper end gap electrode 2 to the distance between the grading ring 4 and the lower end gap electrode 3 is between 0.4 and 0.6 and includes an end value. By limiting the distance ratio between 0.4 and 0.6, the length of the short arc can be uniformly divided, and the success rate of arc dredging is improved.
The grading ring 4 is clamped on a connecting rod 11 between adjacent porcelain insulators in the porcelain insulator string 1 through a clamp 5.
The grading ring 4 is clamped on the connecting rod 11 between the adjacent porcelain insulators through the clamp 5, so that the grading ring 4 can be installed under the condition that the porcelain insulator string 1 is not detached, and the installation complexity is reduced. Meanwhile, the grading ring 4 is arranged on the connecting rod 11 between the adjacent porcelain insulators, so that direct contact with the porcelain insulators can be reduced, and the porcelain insulators are protected.
As shown in fig. 2, the grading ring 4 includes two grading half rings 41 inserted into each other;
the jig 5 includes: the connecting fixing rods 42 are fixedly connected to the inner ring edge of each pressure equalizing half ring 41 respectively; the two fastening half rings 43 are respectively and fixedly connected to the connecting and fixing rod 42, wherein two ends of each fastening half ring 43 are respectively connected with a ring ear 44, and the ring ears 44 of the two fastening half rings 43 are respectively provided with a threaded hole at corresponding positions.
The equalizer ring 4 is two equalizer half rings 41, when the installation, can peg graft each other, thereby constitute the equalizer ring 4 of accomplishing, and be provided with at the inner ring border of equalizer half ring 41 and connect dead lever 42, with two fixed fastening half rings 43, these two fastening half rings 43 pass through the mutual lock back of ring ear 44, insert the bolt through the screw hole again, thereby realize firmly fixing fastening half ring 43, and then realize firmly fixing equalizer ring 4, because anchor clamps 5 can detachably be connected with porcelain insulator chain 1 through the bolt, consequently, can reduce the complexity of being connected of parallelly connected gap device.
As shown in fig. 3, as a preferred embodiment, the embodiment of the present invention provides a parallel gap device for lightning protection of porcelain insulator, which includes, in addition to the structures shown in fig. 1:
and two arc leads 6 which are fixed on the outer ring edge of the grading ring 4 and are vertically arranged, wherein the arc leads 6 are vertically aligned with the arc ignition points on the two sides of the upper end gap electrode 2.
The arc lead 6 is arranged at the edge of the outer ring of the grading ring 4, so that the arc led out from the upper end gap electrode 2 can be led, and the arc is led to the lower end gap electrode 3 through the arc lead 6, so that the arc is prevented from drifting towards the direction of the porcelain insulator string 1.
Preferably, the distance between the edge of the grading ring 4 and the central axis of the porcelain insulator string 1 is greater than or equal to 30 cm.
The interval through setting up 1 axis of border and porcelain insulator chain of equalizer ring 4 is more than or equal to 30cm, can set up the clearance of certain length between equalizer ring 4 and porcelain insulator to keep apart electric arc and porcelain insulator, reduce the condition that electric arc ran to porcelain insulator.
Preferably, as shown in fig. 1 and 3, the line on which the porcelain insulator string 1 is located is an overhead transmission line of 220kV or less, and the upper end gap electrode 2 and the lower end gap electrode 3 are both in a claw shape; gap electrodes in the 220kV overhead transmission line and the overhead transmission line below 220kV are in a goat horn shape;
or the line on which the porcelain insulator string 1 is located is an overhead transmission line with voltage of more than 220kV, and the upper end gap electrode 2 and the lower end gap electrode 3 are both annular. The upper end gap electrode 2 and the lower end gap electrode 3 are arranged in a ring shape, and radial voltage can be balanced.
To sum up, the embodiment of the present invention provides a parallel gap device for porcelain insulator lightning protection, wherein a grading ring 4 is connected to a porcelain insulator string 1 between an upper end gap electrode 2 and a lower end gap electrode 3, thereby shortening the discharge distance between the upper end gap electrode 2 and the lower end gap electrode 3, when a lightning stroke generates a power frequency follow current arc, the power frequency follow current arc is firstly conducted from the upper end gap electrode 2 to the middle grading ring 4, and then conducted from the grading ring 4 to the lower end gap electrode 3, thereby shortening the movement distance of the power frequency follow current arc, so that a long arc between the upper end gap electrode 2 and the lower end gap electrode 3 is converted into two short arcs between the upper end gap electrode 2 and the grading ring 4 and between the grading ring 4 and the lower end gap electrode 3, thereby reducing the movement complexity of the power frequency follow current arc, and reducing the possibility of the arc running to the surface of the porcelain insulator string 1, the success rate of dredging the electric arc is improved, and the protection effect on the porcelain insulator string 1 is improved.
The above description is only exemplary of the invention, and is intended to enable those skilled in the art to understand and implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The foregoing is only a detailed description of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (7)
1. A parallel gap device for porcelain insulator lightning protection, comprising:
an upper end gap electrode (2) fixedly arranged at the upper end of the porcelain insulator string (1);
a lower end gap electrode (3) fixedly arranged at the lower end of the porcelain insulator string (1); and the number of the first and second groups,
and the grading ring (4) is connected with the porcelain insulator string (1) between the upper end gap electrode (2) and the lower end gap electrode (3).
2. Parallel gap arrangement for lightning protection in porcelain insulators according to claim 1, characterised in that the ratio between the distance of the grading ring (4) from the upper end gap electrode (2) and the distance of the grading ring (4) from the lower end gap electrode (3) is between 0.4 and 0.6, inclusive.
3. Parallel gap arrangement for lightning protection of porcelain insulators according to claim 1, characterised in that the grading ring (4) is clamped by means of clamps (5) on the connecting rods (11) between adjacent porcelain insulators in the porcelain insulator string (1).
4. Parallel gap arrangement for lightning protection of porcelain insulators according to claim 3, characterised in that the grading ring (4) comprises two grading half rings (41) inserted into each other;
the clamp (5) comprises: the connecting fixing rods (42) are fixedly connected to the inner ring edge of each pressure equalizing half ring (41); the two fastening half rings (43) are respectively and fixedly connected with the connecting and fixing rod (42), wherein two ends of each fastening half ring (43) are respectively connected with a ring ear (44), and threaded holes are respectively formed in the corresponding positions of the ring ears (44) of the two fastening half rings (43).
5. The parallel gap device for lightning protection of porcelain insulators according to claim 1, further comprising:
be fixed in the outer loop border of equalizer ring (4) and two electric arc lead wires (6) of vertical setting, electric arc lead wire (6) with the vertical alignment of upper end gap electrode (2) both sides arcing point.
6. Parallel gap arrangement for lightning protection of porcelain insulators according to claim 1, characterised in that the distance between the edge of the grading ring (4) and the centre axis of the porcelain insulator string (1) is greater than or equal to 30 cm.
7. The parallel gap device for the lightning protection of the porcelain insulator according to claim 1, wherein the line on which the porcelain insulator string (1) is located is an overhead transmission line of 220kV or less, and the upper end gap electrode (2) and the lower end gap electrode (3) are both in a claw shape; or,
the line on which the porcelain insulator string (1) is located is an overhead transmission line with voltage of more than 220kV, and the upper end gap electrode (2) and the lower end gap electrode (3) are both annular.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621335817.5U CN206388574U (en) | 2016-12-07 | 2016-12-07 | Parallel connection clearance device for porcelain insulator lightning protection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621335817.5U CN206388574U (en) | 2016-12-07 | 2016-12-07 | Parallel connection clearance device for porcelain insulator lightning protection |
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| CN206388574U true CN206388574U (en) | 2017-08-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108231300A (en) * | 2017-12-20 | 2018-06-29 | 国网湖南省电力有限公司 | A kind of parallel connection clearance device of anti-thunder insulator |
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2016
- 2016-12-07 CN CN201621335817.5U patent/CN206388574U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108231300A (en) * | 2017-12-20 | 2018-06-29 | 国网湖南省电力有限公司 | A kind of parallel connection clearance device of anti-thunder insulator |
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