阅读说明：本技术 并联组合间隙防雷装置 (Parallel combined gap lightning protection device ) 是由 彭永晶 蒋正龙 胡建平 王博闻 谢鹏康 吴伟 于 2020-12-11 设计创作，主要内容包括：本发明公开了一种并联组合间隙防雷装置,它包括绝缘子和并联组合间隙；绝缘子包括芯棒、金具和复合外套,一对金具分设于芯棒两端,复合外套同轴设置于芯棒外；并联组合间隙包括放电电极和屏蔽绝缘板,屏蔽绝缘板连接于芯棒中部,一对放电电极分设于芯棒两端、关于屏蔽绝缘板对称布置。通过上、下布置的一对放电电极之间设置绝缘遮蔽板,使得投入使用后间隙放电路径不再沿着上、下电极之间的轴线发展,绝缘屏障板边角处空间电场畸变对流注发展路径选择性产生影响,增长了电弧距离,解决了并联间隙难以熄灭工频续流进而引发线路跳闸问题,提升了线路防雷装置可靠性及线路运行的稳定性。(The invention discloses a lightning protection device with parallel combined gaps, which comprises an insulator and parallel combined gaps, wherein the insulator is arranged between the insulator and the parallel combined gaps; the insulator comprises a core rod, hardware fittings and a composite outer sleeve, wherein the pair of hardware fittings are respectively arranged at two ends of the core rod, and the composite outer sleeve is coaxially arranged outside the core rod; the parallel combination gap comprises a discharge electrode and a shielding insulation plate, the shielding insulation plate is connected to the middle of the core rod, and the pair of discharge electrodes are respectively arranged at two ends of the core rod and are symmetrically arranged relative to the shielding insulation plate. Set up insulating shield plate between a pair of discharge electrode through upper and lower arrangement for gap discharge path no longer develops along the axis between the upper and lower electrode after putting into service, and insulating shield plate edge space electric field distortion influences the convection current development route selectivity, has increased the arc distance, has solved the parallel gap and has been difficult to extinguish the power frequency afterflow and then cause the circuit tripping operation problem, has promoted the stability of circuit lightning protection device reliability and circuit operation.)

1. The utility model provides a parallelly connected combination clearance lightning protection device which characterized in that: it comprises an insulator and a parallel combination gap;

the insulator comprises a core rod, hardware fittings and a composite outer sleeve, wherein the pair of hardware fittings are respectively arranged at two ends of the core rod, and the composite outer sleeve is coaxially arranged outside the core rod;

the parallel combination gap comprises a discharge electrode and a shielding insulation plate, the shielding insulation plate is connected to the middle of the core rod, and the pair of discharge electrodes are respectively arranged at two ends of the core rod and are symmetrically arranged relative to the shielding insulation plate.

2. The parallel combination gap lightning protection device of claim 1, wherein: the core rod is a glass fiber rod, a bayonet is arranged at the middle section of the core rod, and threads are arranged at the two ends of the core rod.

3. The parallel combination gap lightning protection device of claim 2, wherein: the discharge electrode comprises an end seat, a support arm and a discharge head; the end seat is a nut seat, the inner end of the support arm is hinged with the mounting seat, and the outer end of the support arm is connected with the discharge head; the discharge electrodes are connected to the two ends of the core rod through end seats in a threaded mode.

4. The parallel combination gap lightning protection device of claim 3, wherein: the discharge head is a bulb.

5. The parallel combination gap lightning protection device of claim 2, wherein: the shielding insulating plate is connected to a bayonet at the middle section of the mandrel through an insulating support member, and the center of the shielding insulating plate is aligned with the discharge head.

6. The parallel combination gap lightning protection device of claim 5, wherein: the inner end of the insulating support piece is provided with a clamping head connected with the bayonet, and the outer end of the insulating support piece is provided with a slot; the shielding insulating plate is inserted into the slot.

7. The parallel combination gap lightning protection device of claim 6, wherein: the shielding insulating plate is a square insulating plate.

8. The parallel combination gap lightning protection device of claim 1, wherein: the hardware fitting comprises a ball head hardware fitting and a ball socket hardware fitting, and the ball head hardware fitting and the ball socket hardware fitting are respectively arranged at two ends of the core rod.

9. The parallel combination gap lightning protection device of claim 1, wherein: the composite outer sleeve is a silicone rubber umbrella skirt sleeve.

10. The parallel combination gap lightning protection device of claim 9, wherein: the umbrella skirt of the composite coat is a flower arrangement type umbrella skirt with the large part and the small part alternately arranged.

Technical Field

The invention belongs to the technical field of lightning protection of power transmission lines, and particularly relates to a parallel combined gap lightning protection device.

Background

The 110kV and above transmission lines in China are criss-cross, are widely distributed, have different landforms and geomorphology, are complex and changeable in meteorological environment, are easy to influence the insulation strength of a line insulator, are particularly easy to be struck by lightning when the transmission lines are in a lightning activity area, and then cause faults such as line tripping, power failure, equipment damage and the like, and how to manage the line lightning stroke disasters is the key for ensuring safe operation of a power grid and reliable power supply of users.

At present, the main means for line lightning protection is to reduce the grounding resistance of a line tower, strengthen the insulation level of a line, and additionally install a parallel gap or a line lightning arrester and the like. The gapless lightning arrester on the line has the problems of power frequency follow current, difficulty in arc extinction, aging of the lightning arrester and the like. The gap-equipped lightning arrester has the defects of low discharging reliability, difficulty in meeting the size of a tower window and the like. Although the existing parallel gap structure can prevent lightning flashover, the lightning flashover is difficult to prevent from tripping at the cost of damaging the external insulation of an insulator, and power frequency follow current is difficult to extinguish arc, so that automatic reclosing failure is caused.

Disclosure of Invention

The invention aims to provide a parallel combined gap lightning protection device which can cut off power frequency follow current and avoid automatic reclosing failure aiming at the defects of the prior art.

The invention provides a lightning protection device with parallel combined gaps, which comprises insulators and parallel combined gaps; the insulator comprises a core rod, hardware fittings and a composite outer sleeve, wherein the pair of hardware fittings are respectively arranged at two ends of the core rod, and the composite outer sleeve is coaxially arranged outside the core rod; the parallel combination gap comprises a discharge electrode and a shielding insulation plate, the shielding insulation plate is connected to the middle of the core rod, and the pair of discharge electrodes are respectively arranged at two ends of the core rod and are symmetrically arranged relative to the shielding insulation plate.

The core rod is a glass fiber rod, a bayonet is arranged at the middle section of the core rod, and threads are arranged at the two ends of the core rod.

The discharge electrode comprises an end seat, a support arm and a discharge head; the end seat is a nut seat, the inner end of the support arm is hinged with the mounting seat, and the outer end of the support arm is connected with the discharge head; the discharge electrodes are connected to the two ends of the core rod through end seats in a threaded mode.

The discharge head is a bulb.

The shielding insulating plate is connected to a bayonet at the middle section of the mandrel through an insulating support member, and the center of the shielding insulating plate is aligned with the discharge head.

The inner end of the insulating support piece is provided with a clamping head connected with the bayonet, and the outer end of the insulating support piece is provided with a slot; the shielding insulating plate is inserted into the slot.

The shielding insulating plate is a square insulating plate.

The hardware fitting comprises a ball head hardware fitting and a ball socket hardware fitting, and the ball head hardware fitting and the ball socket hardware fitting are respectively arranged at two ends of the core rod.

The composite outer sleeve is a silicone rubber umbrella skirt sleeve.

The umbrella skirt of the composite coat is a flower arrangement type umbrella skirt with the large part and the small part alternately arranged.

According to the invention, the shielding insulating plate is placed between the pair of discharge electrodes arranged up and down, so that the gap discharge path is not developed along the axis between the upper electrode and the lower electrode after the shielding insulating plate is put into use, space electric field distortion at the corner of the insulating shielding plate influences the selectivity of the convection flow development path, the arc distance is increased, the problem that the line trip is caused by the difficulty in extinguishing power frequency follow current of the parallel gap is solved, and the reliability of the line lightning protection device and the stability of line operation are improved.

Drawings

Fig. 1 is a schematic cross-sectional structure of a preferred embodiment of the present invention.

Sequence numbers of the drawings:

1-ball socket hardware; 2-ball head hardware; 3, a core rod; 4, compounding a jacket; 5-upper discharge electrode; 6-lower discharge electrode; 7-an insulating support; 8, shielding an insulating plate; 9-discharge channel i; 10-discharge channel II.

Detailed Description

As shown in fig. 1, the parallel combined gap lightning protection device disclosed in this embodiment is used for a 220kV transmission line as an example. The insulator comprises an insulator and a parallel combined gap.

The insulator consists of a ball socket hardware fitting 1, a ball head hardware fitting 2, a core rod 3 and a composite outer sleeve 4. The insulator adopts a glass fiber rod with the diameter of 40mm as a core rod, and a composite outer sleeve is poured outside the core rod through silicon rubber to form the composite insulator with the height of 2.0 m. The umbrella skirt structure of the composite coat 4 is a flower arrangement type structure. And a bayonet is reserved in the middle of the core rod for mounting the insulating support member 7, and threads are arranged outside two ends of the core rod so as to mount the discharge electrode. The upper end of the core rod adopts a ball socket fitting 1, and the lower end of the core rod adopts a ball head fitting 2 so as to be convenient for field installation. The inner end of the insulating support member 7 is provided with a clamping head matched with the bayonet, and the outer end is provided with a slot for inserting the shielding insulating plate 8.

The parallel combination gap is composed of an upper end discharge electrode 5, a lower end discharge electrode 6 and a shielding insulation plate 8. The upper end discharge electrode 5 and the lower end discharge electrode 6 have the same structure, are respectively arranged at two ends of the core rod and are symmetrically arranged relative to the shielding insulating plate 8. The upper end discharge electrode 5 and the lower end discharge electrode 6 both comprise an end seat, a support arm and a discharge head; the end seat is a nut seat, the discharge head is a ball head, the inner end of the support arm is hinged with the mounting seat, and the outer end of the support arm is connected with the discharge head; the discharge electrodes are connected to the two ends of the core rod through end seats in a threaded mode. After the installation is finished, the end seat can be rotated to enable the upper end discharge electrode 5 and the lower end discharge electrode 6 to slide axially along the mandrel to adjust the relative distance, and the hinge angle of the support arm and the end seat can be rotated, so that the distance between the upper end discharge electrode 5 and the lower end discharge electrode 6 is adjusted to 1.6m, and the discharge head is aligned with the center of the insulation shielding plate. The insulation shield plate 8 is 20mm × 20mm in size and 1mm in thickness, and the insulation shield plate 8 is inserted into the insulation support 7.

In this embodiment, the distance between the upper end discharge electrode 5 and the lower end discharge electrode 6 is adjusted to 80% of the height of the insulator, and the discharge ends of the upper end discharge electrode 5 and the lower end discharge electrode 6 are kept aligned with the center position of the insulating shielding plate 5, so as to ensure that the insulating shielding plate 8 has expected effects on the discharge path and the discharge voltage. Through set up one insulating shield plate in the middle of the parallel gap, put into operation, the clearance discharge passageway exists between upper and lower electrode, strides over middle shielding insulation board, probably passes through from the shielding insulation board surface, winds to the electrode again, if discharge passageway I9, also can not pass through from the flat insulation board surface, directly bypasses the shielding insulation board, if discharge passageway II 10, accomplishes the clearance and punctures. The discharge voltage and the discharge path are improved, the arc distance is increased, the problem that the parallel gap is difficult to extinguish power frequency follow current so as to cause line tripping is solved, and the lightning protection level of the line is improved. The gap discharge path is not developed along the axis between the upper electrode and the lower electrode any more, the space electric field distortion at the corners of the insulating barrier plate influences the selectivity of the convection current development path, the arc distance is increased, the problem that the parallel gap is difficult to extinguish power frequency follow current so as to cause circuit tripping is solved, and powerful technical support is provided for the reliability of the circuit lightning protection device and the stability of circuit operation.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.