CN214280429U

CN214280429U - 500kV discharge gap device

Info

Publication number: CN214280429U
Application number: CN202120151895.4U
Authority: CN
Inventors: 姚建生; 朱小强; 史小龙; 姚栋宇; 高檬檬; 肖峰; 费小玲; 程广荣
Original assignee: Jiangsu Tiannan Electric Power Co Ltd
Current assignee: Jiangsu Tiannan Electric Power Co Ltd
Priority date: 2021-01-20
Filing date: 2021-01-20
Publication date: 2021-09-24
Anticipated expiration: 2031-01-20

Abstract

The invention relates to an insulator protection device, belongs to the field of electrical protection in a power network, and particularly relates to a 500kV discharge gap device. The high-voltage arc striking device comprises a high-voltage arc striking ring arranged on a high-voltage side electrode and a voltage-sharing arc striking angle arranged on a low-voltage side electrode, wherein the high-voltage arc striking ring and the voltage-sharing arc striking angle are symmetrically connected to hardware fittings at two ends of a composite insulator from top to bottom; the connecting end of the voltage-sharing arcing horn is fixedly arranged on a low-voltage side electrode of the insulator through a second fastener, and an annular arcing end corresponding to the connecting end and the corresponding arcing end of the high-voltage arcing ring form a discharge gap. The voltage-sharing and lightning protection functions are realized, and the insulator end hardware fitting can be prevented from being ablated by the power-frequency follow current electric arc.

Description

500kV discharge gap device

Technical Field

The invention relates to an insulator protection device, belongs to the field of electrical protection in a power network, and particularly relates to a 500kV discharge gap device.

Background

The transmission line is in open field and is easy to be struck by lightning. Direct lightning overvoltage caused by lightning striking a circuit is combined with induced lightning overvoltage caused by lightning striking the ground near the circuit, namely atmospheric overvoltage which often occurs on a power transmission circuit. The accidents of insulator flicker, line tripping and damage of electrical equipment caused by lightning wave invasion in the transformer account for a large percentage of the total accidents of the power grid. To prevent such accidents caused by atmospheric overvoltage, power lines and substations have been installed with lightning conductor wires (overhead ground wires), lightning rods, and different types of arresters, etc. The shielding protection angle of the overhead ground wire to the wire is generally not more than 25 degrees, the main function of the shielding protection angle is to prevent lightning from directly striking the wire, the protection to the external wire, especially to the induced lightning overvoltage depends too much on being equipped with an arc-striking angle as one of effective lightning protection devices with other types of lightning arresters, and the shielding protection angle is arranged at the end part of an insulator string by a certain arc-striking gap.

At present, a 500kV power grid is a main grid frame of a power transmission network in China, and lightning protection of a 500kV overhead power transmission line is an important premise for guaranteeing safe and stable operation of a power system. However, in order to solve the actual situation that power frequency follow current damages the insulator and the hardware thereof after the 500kV transmission line in China is subjected to lightning flashover, it is necessary to research and provide a 500kV overhead transmission line gap lightning protection device.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a discharge gap device of 500kV installs in the both ends of insulator, has realized the voltage-sharing and the lightning protection function of insulator, has reached the purpose that effectively prevents power frequency afterflow electric arc ablation insulator tip gold utensil.

The utility model provides a technical scheme does: a500 kV discharge gap device comprises a high-voltage arc striking ring arranged on a high-voltage side electrode and a voltage-sharing arc striking angle arranged on a low-voltage side electrode, wherein the high-voltage arc striking ring and the voltage-sharing arc striking angle are symmetrically connected to hardware fittings at two ends of a composite insulator up and down; the connecting end of the voltage-sharing arcing horn is fixedly arranged on a low-voltage side electrode of the insulator through a second fastener, the connecting end corresponds to an annular arcing end which is bent downwards towards the side, a notch is reserved in the annular arcing end, and the annular arcing end and the corresponding arcing end of the high-voltage arcing ring form a discharge gap.

Further optimization and improvement of the scheme are as follows: the lower electrode ring body is of a tennis racket shape with an opening at one end, the opening end is fixedly connected with the longitudinal lower electrode welding plate, and the diameter of the section of the lower electrode ring body is 60 mm.

Further optimization and improvement of the scheme are as follows: the lower electrode ring body comprises a horizontal section and an upward bent arc-striking end, the horizontal section and the upward bent arc-striking end are integrally arranged, and the corresponding geometric dimensions are as follows: 3. the lower electrode ring body comprises a horizontal section and an upward bent arc-striking end, the horizontal section and the upward bent arc-striking end are integrally arranged, and the corresponding geometric dimensions are as follows: the height H1=725 mm-735 mm, the inclination angle α =55 ° between the horizontal section and the upward-curved arc-striking end, the radius of the transition arc between the horizontal section and the upward-curved arc-striking end is R1=240mm, the arc radius R2=240mm at the arc-striking end, the center distance Y =258 mm-262 mm between the horizontal sections, zinc flowing holes are further formed in the horizontal section, the whole width W1=1045mm of the high-voltage arc-striking ring, and the widest position of the lower electrode ring body is W2=600 mm.

Further optimization and improvement of the scheme are as follows: the pressing arcing horn is provided with a horizontal part and a bent part, the horizontal part and the bent part are integrally arranged, the radius of a transition arc between the horizontal part and the bent part is R3=100mm, the included angle between the horizontal section and the bent section of the pressure-equalizing arcing horn is beta =125 degrees, and the height of the pressure-equalizing arcing horn is H2=745 mm-755 mm; the radius R4=60mm of the annular arcing end, the included angle theta =45 ° at the opening, and the section diameter of the voltage-sharing arcing angle is 28 mm.

Compared with the prior art, the utility model discloses the beneficial effect who brings does:

1. the high-voltage arc striking ring adopts a tennis racket-shaped opening design, so that the arcing voltage is more stable, and the dry arc distance between phases is kept while the arc principle is adopted as an insulator; the high-voltage arc striking ring and the voltage-sharing arcing horn are both standard size designs, and are convenient for standardized and batch production of products.

2. The utility model can achieve the lightning protection effect only by adopting the vertical symmetrical installation of the pair of voltage-sharing arcing horns and the high-voltage arcing rings, is different from two pairs of symmetrical devices in the traditional design, saves the cost, reduces the operation times of operators and reduces the potential safety hazard; the tail end of the voltage-sharing arcing horn is provided with the novel discharging device which discharges annularly, so that the discharging voltage is more stable, the arc resistance and arc extinguishing performance are better, and the service life is longer.

3. The utility model discloses well voltage-sharing is beckoned the arc angle and is the function that grading ring and beckon the arc angle unite two into one, and the corona is prevented in existing grading ring voltage-sharing's advantage has the performance that beckon arc angle beckong arc extinguishing again.

Drawings

Fig. 1 is a front view of the high-voltage arc striking ring of the present invention.

Fig. 2 is a schematic view of direction a in fig. 1.

Fig. 3 is a bottom view of the high-voltage arc-striking ring of the present invention.

Fig. 4 is a front view of the voltage-sharing arcing horn of the present invention.

Fig. 5 is a left side view of the voltage-sharing arcing horn of the present invention.

Detailed Description

As shown in fig. 1 to 5, a 500kV discharge gap device includes a high voltage arc ignition ring 1 mounted on a high voltage side electrode and a grading arcing horn 2 mounted on a low voltage side electrode, the high-voltage arc striking ring 1 and the voltage-sharing arcing horn 2 are symmetrically connected to hardware fittings at two ends of the composite insulator from top to bottom, the high-voltage arc striking ring 1 is in a tennis racket shape with an opening at one end, the high-voltage arc striking ring 1 comprises a lower electrode ring body 11, a longitudinal lower electrode welding plate 12, a lower electrode rib plate 13, a transverse lower electrode welding plate 14 and a first fastener 15, the lower electrode ring body 11 is fixed on the longitudinal lower electrode welding plate 12, the transverse lower electrode welding plate 14 and the longitudinal lower electrode welding plate 12 are vertically fixed in a T shape, the lower electrode rib plates 13 are symmetrically arranged at the T-shaped right angle, the first fasteners 15 are positioned on the transverse lower electrode welding plate 14, the high-voltage arc striking ring 1 is connected with a hardware fitting on an electrode on the high-voltage side of the insulator through a first fastener 15; the connecting end 21 of the voltage-sharing arcing horn 2 is fixedly arranged on the low-voltage side electrode of the insulator through a second fastener 22, the connecting end corresponds to an annular arcing end 23 which bends downwards towards the side, a notch is reserved in the annular arcing end, and the annular arcing end 23 and the corresponding arcing end 16 of the high-voltage arcing ring 1 form a discharge gap.

The lower electrode ring body 11 is of a tennis racket shape with an opening at one end, and the opening end is fixedly connected with the longitudinal lower electrode welding plate 12; the lower electrode ring body 11 comprises a horizontal section 111 and an upward-bent arc-striking end 112, the horizontal section 111 and the upward-bent arc-striking end 112 are integrally arranged, and the corresponding geometric dimensions are as follows: the cross-sectional diameter R1=60mm of the lower electrode ring body, the height H1=725 mm-735 mm, the inclination angle α =55 ° between the horizontal section 111 and the upward-curved arc-striking end 112, the radius of the transition arc between the horizontal section 111 and the upward-curved arc-striking end 112 is R1=240mm, the arc radius R2=240mm at the end of the arc-striking end 112, the center distance Y =258 mm-262 mm between the horizontal sections 111, the horizontal section is also provided with a zinc flowing hole 16, the whole width W1=1045mm of the high-voltage arc-striking ring body is W2=600mm, and the widest position of the lower electrode ring body is W2=600 mm.

The voltage-sharing arcing horn 2 is provided with a horizontal part 24 and a curved part 25, the horizontal part 24 and the curved part 25 are integrally arranged, the radius of a transition arc between the horizontal part 24 and the curved part is R3=100mm, the diameter of the cross section of the voltage-sharing arcing horn is R2=28mm, the included angle beta between the horizontal part 24 and the curved part 25 of the voltage-sharing arcing horn is =125 degrees, and the height H2=745 mm-755 mm of the voltage-sharing arcing horn; the annular arcing end 23 is located at the end of the curved portion 25 and has a radius R4=60mm and the angle θ =45 ° at the gap.

The present invention has been described in this specification in terms of certain preferred embodiments only, and not as limitations thereof. It will be appreciated by those skilled in the art that various changes or modifications may be made in the structure of the strap, such as in the strap to conventional strap, without departing from the spirit and scope of the invention.

Claims

1. A 500KV discharge gap device, characterized in that: the high-voltage arc striking device comprises a high-voltage arc striking ring and a voltage-sharing arc striking angle, wherein the high-voltage arc striking ring is arranged on a high-voltage side electrode, the voltage-sharing arc striking angle is arranged on a low-voltage side electrode, the high-voltage arc striking ring and the voltage-sharing arc striking angle are vertically and symmetrically connected to hardware fittings at two ends of a composite insulator, the high-voltage arc striking ring is in a tennis racket shape with one open end, the high-voltage arc striking ring comprises a lower electrode ring body, a longitudinal lower electrode welding plate, a lower electrode rib plate, a transverse lower electrode welding plate and a first fastener, the lower electrode ring body is fixed on the longitudinal lower electrode welding plate, the transverse lower electrode welding plate and the longitudinal lower electrode welding plate are vertically fixed in a T shape, the lower electrode rib plate is symmetrically arranged at a right angle, the first fastener is positioned on the transverse lower electrode welding plate, and the high-voltage arc striking ring is connected with the hardware fittings on the high-voltage side electrode of the insulator through the first fastener; the connecting end of the voltage-sharing arcing horn is fixedly arranged on a low-voltage side electrode of the insulator through a second fastener, the connecting end corresponds to an annular arcing end which is bent downwards towards the side, a notch is reserved in the annular arcing end, and the annular arcing end and the corresponding arcing end of the high-voltage arcing ring form a discharge gap.

2. A 500KV discharge gap device according to claim 1, wherein: the lower electrode ring body is of a tennis racket shape with an opening at one end, the opening end is fixedly connected with the longitudinal lower electrode welding plate, and the diameter of the section of the lower electrode ring body is 60 mm.

3. A 500KV discharge gap device according to claim 2, wherein: the lower electrode ring body comprises a horizontal section and an upward bent arc-striking end, the horizontal section and the upward bent arc-striking end are integrally arranged, and the corresponding geometric dimensions are as follows: the height H1=725 mm-735 mm, the inclination angle α =55 ° between the horizontal section and the upward-curved arc-striking end, the radius of the transition arc between the horizontal section and the upward-curved arc-striking end is R1=240mm, the arc radius R2=240mm at the arc-striking end, the center distance Y =258 mm-262 mm between the horizontal sections, zinc flowing holes are further formed in the horizontal section, the whole width W1=1045mm of the high-voltage arc-striking ring, and the widest position of the lower electrode ring body is W2=600 mm.

4. A 500KV discharge gap device according to claim 2, wherein: the voltage-sharing arcing horn is provided with a horizontal part and a bent part, the horizontal part and the bent part are integrally arranged, the radius of a transition arc between the horizontal part and the bent part is R3=100mm, the included angle between the horizontal section and the bent section of the voltage-sharing arcing horn is beta =125 degrees, and the height of the voltage-sharing arcing horn is H2=745 mm-755 mm; the radius R4=60mm of the annular arcing end, the included angle theta =45 ° at the opening, and the section diameter of the voltage-sharing arcing angle is 28 mm.