CN106448977A - Metal oxide arrester device for +/-660kV DC transmission line - Google Patents

Abstract

The invention provides a metal oxide arrester device for a +/-660kV DC transmission line. The metal oxide arrester device comprises an arrester body, a high-voltage terminal electrode, a low-voltage terminal electrode, an insulating base, a counter, a special connection plate, V strings of composite insulators, a clamp, an adjustable I-beam and an angle iron support, wherein the high-voltage terminal electrode is connected with a transmission conductor suspension yoke plate through the special connection plate; the low-voltage terminal electrode is fixed at one end of the arrester body and the other end of the arrester body is fixed on a transmission line tower through the insulating base, the adjustable I-beam and the angle iron support; and the middle part of the arrester body is fixed on the transmission line tower through the V strings of composite insulators. The metal oxide arrester device can meet the security transmission requirements of the +/-660kV DC transmission line in a lightning stroke state; and the disadvantages of a power failure caused by a lightning stroke are avoided.

Description

A metal oxide arrester device for ±660kV direct current transmission line

technical field

The invention relates to the technical field of lightning arresters for DC transmission lines, in particular to a metal oxide lightning arrester device for ±660kV DC transmission lines.

Background technique

Ningdong DC is the world's first ±660kV DC power transmission project. It is a key power grid project of my country's "West-to-East Power Transmission", and it is also an important transmission channel for Northwest Power Grid to North China Power Grid. The existing ±660kV direct current transmission line does not have a reliable and applicable lightning protection facility so far, which has a great risk of line tripping accidents caused by lightning strikes on the transmission line.

Contents of the invention

The purpose of the present invention is to provide a metal oxide lightning arrester device for ±660kV DC transmission lines, which can effectively guarantee the safe transmission of ±660kV DC transmission lines under the state of lightning strikes, avoid power outages caused by lightning strikes, and improve the transmission line level of lightning resistance.

In order to achieve the above object, the technical scheme adopted in the present invention is as follows:

Construct a metal oxide arrester device for ±660kV DC transmission line, including arrester body, high-voltage terminal electrode, low-voltage terminal electrode, insulating base, counter, special connecting plate, V-string composite insulator, fixture, adjustable I-beam and angle steel stand. The transmission line tower has two sets of line insulators. The upper end of the first set of line insulators is installed at the lower left end of the tower head of the transmission line tower. The upper end of the suspension link plate is installed at the lower end of the first set of line insulators. The upper end of the high-voltage terminal electrode is installed at the lower end of the special connecting plate, and a set of wires of the transmission line is installed on the suspension connecting plate; the upper end of the second set of line insulators is installed at the lower right end of the tower head of the transmission line tower, and the upper end of the hanging connecting plate is installed on the second set At the lower end of the line insulator, another set of conductors of the transmission line is installed on the suspension link plate. The lower end of the low-voltage terminal electrode is installed on the upper end of the arrester body, the left part of the V-string composite insulator is installed on the right middle part of the arrester body, the right part of the V-string composite insulator is installed on the left end of the tower body of the transmission line tower through a clamp, and the upper end of the insulating base is installed on the lower end of the arrester body. The lower end of the insulating base is installed on the upper end of the I-beam, the lower end of the I-beam is installed on the upper end of the angle steel bracket, the lower end of the angle steel bracket is installed on the left end of the tower body of the transmission line tower, and the counter matching the lightning arrester is installed on the left end of the tower body of the transmission line tower and the connecting wire is grounded .

According to the above scheme, after the arrester body, high-voltage terminal electrodes, low-voltage terminal electrodes, insulating bases, counters, special connecting plates, V-string composite insulators, clamps, adjustable I-beams and angle steel brackets are installed on the transmission line tower, no displacement due to external force.

According to the above scheme, the high-performance DC zinc oxide resistor is packaged inside the arrester body, which can meet the requirements of lightning energy absorption and ±660kV DC transmission system protection.

According to the above scheme, the exterior of the arrester body is equipped with a silicone rubber composite jacket formed by the overall one-time molding technology. The silicone rubber composite jacket adopts a "large and small" shed structure from top to bottom, which improves the direct current pollution of the shed. problems, and at the same time meet the requirements of the external insulation on the creepage distance.

According to the above solution, the insulating base isolates the lightning arrester body from the transmission line tower, and discharges the lightning current into the ground through the counter connecting wire matched with the lightning arrester, while ensuring the reliability of the counter operation.

According to the above scheme, the V-series composite insulator is in the middle of the arrester body by obliquely pulling the arrester body to withstand the bending moment brought by the gravity of the arrester body itself and the wind load, ensuring the installation stability and reliable performance of the long structural size and large-mass arrester sex.

According to the above solution, the adjustable I-beam and the angle steel bracket are used together to adjust the air gap distance between the high-voltage end electrode and the low-voltage end electrode.

The beneficial effects of the present invention are:

(1) The metal oxide arrester device for the ±660kV DC transmission line of the present invention includes an arrester, an insulating base, a special connecting plate, a V-string composite insulator, an adjustable I-beam and an angle steel bracket, which can meet the requirements of the ±660kV DC transmission system in The need for safe power transmission under lightning strikes prevents the disadvantages of power outages caused by lightning strikes.

(2) The DC zinc oxide resistance sheet inside the arrester body absorbs the lightning current energy, and discharges it to the ground through the counter connecting wire matched with the arrester body, protecting the air gap (or insulator) at the tower head of the transmission line from lightning flashover.

(3) The silicone rubber composite jacket outside the arrester body adopts a "one large and one small" shed structure from top to bottom, which improves the problem of DC pollution on the shed and meets the requirements for creepage distance of the external insulation.

(4) The adjustable I-beam and angle steel bracket are used together to adjust the air gap distance between the high-voltage end electrode and the low-voltage end electrode to meet the technical requirements.

(5) The V-string composite insulator obliquely pulls the arrester body in the middle of the arrester body to bear the bending moment caused by the gravity of the arrester body itself and the wind load, which ensures the installation stability and performance reliability of the long structural size and high-quality arrester.

Description of drawings

Fig. 1 is the installation structure schematic diagram of lightning arrester device of the present invention;

Fig. 2 is the structural representation of lightning arrester of the present invention;

Fig. 3 is a structural schematic diagram of the body unit of the arrester of the present invention.

In the figure: 1. Transmission line tower; 2. Line insulator; 3. Suspension connecting plate; 4. Transmission wire; 5. Special connection plate; 6. High voltage end electrode; 7. Low voltage end electrode; V-string composite insulator; 10. Fixture; 11. Insulation base; 12. Adjustable I-beam; 13. Angle steel bracket; 14. Composite jacket; 15. Zinc oxide resistance sheet.

detailed description

The technical solutions of the present invention will be described below in conjunction with the accompanying drawings and embodiments.

As shown in Figures 1-3, a metal oxide arrester device for a ±660kV direct current transmission line according to the present invention includes an arrester body 8, a high-voltage terminal electrode 6, a low-voltage terminal electrode 7, an insulating base 11, a counter, and a dedicated connection Plate 5, V-string composite insulator 9, clamp 10, adjustable I-beam 12 and angle steel bracket 13.

The transmission line tower 1 of the present invention has two groups of line insulators 2, the upper end of the first group of line insulators 2 is installed at the lower left end of the tower head of the transmission line tower 1, and the upper end of the suspension connecting plate 3 is installed at the lower end of the first group of line insulators 2. The upper end of the connecting plate 5 is installed on the lower end of the hanging connecting plate 3, the upper end of the high-voltage terminal electrode 6 is installed on the lower end of the special connecting plate 5, and one group of transmission wires 4 of the transmission line is installed on the hanging connecting plate 3; the upper end of the second group of line insulators 2 is installed on the The lower right end of the tower head of the transmission line pole tower 1, the upper end of the suspension joint plate 3 is installed on the lower end of the second group of line insulators 2, and another group of transmission wires 4 of the transmission line is installed on the suspension joint plate 3.

The lower end of the low-voltage terminal electrode 7 of the present invention is installed on the upper end of the arrester body 8, the left part of the V-string composite insulator 9 is installed on the right middle part of the arrester body 8, and the right part of the V-string composite insulator 9 is installed on the tower body of the transmission line pole tower 1 through a clamp 10 At the left end, the upper end of the insulating base 11 is installed on the lower end of the arrester body 8, the lower end of the insulating base 11 is installed on the upper end of the adjustable I-beam 12, the lower end of the adjustable I-beam 12 is installed on the upper end of the angle steel bracket 13, and the lower end of the angle steel bracket 13 is installed on the transmission line pole tower The left end of the tower body of 1, the supporting counter of the lightning arrester is installed on the left end of the tower body of the transmission line pole tower 1 and the connection line is grounded.

Arrester body 8, high-voltage terminal electrode 6, low-voltage terminal electrode 7, insulating base 11, counter, special connecting plate 5, V-string composite insulator 9, clamp 10, adjustable I-beam 12 and angle steel bracket 13 are installed in the present invention. After the power transmission line tower 1 is mounted, no displacement will occur due to external force.

The lightning arrester body 8 of the present invention encapsulates a high-performance DC zinc oxide resistor 15 inside, which can meet the requirements of lightning energy absorption and ±660kV DC transmission system protection.

The arrester body 8 of the present invention is equipped with a silicone rubber composite jacket 14 formed by integral one-time molding technology. The silicone rubber composite jacket 14 adopts a "large and small" shed structure from top to bottom, which improves the DC product of the shed. Pollution problems, while meeting the requirements of the external insulation on the creepage distance.

The insulating base 11 of the present invention isolates the lightning arrester body 8 from the power transmission line tower 1, discharges the lightning current into the ground through the counter connecting wire matched with the lightning arrester, and ensures the reliability of the counter operation at the same time.

The V-string composite insulator 9 of the present invention is in the middle of the arrester body 8 by obliquely pulling the arrester body 8 to withstand the bending moment brought by the gravity of the arrester body 8 itself and the wind load, ensuring the installation stability of the long structure size and large-mass arrester. performance reliability.

The adjustable I-beam 12 and the angle steel bracket 13 of the present invention are used together to adjust the air gap distance between the high-voltage end electrode 6 and the low-voltage end electrode 7 to meet the technical requirements.

When the present invention is applied, since the outer silicone rubber composite jacket 14 of the arrester body 8 adopts a "one large and one small" shed structure from top to bottom, and the big sheds and small sheds are arranged at intervals, the direct current pollution of the sheds can be improved. problems, and at the same time meet the requirements of the external insulation on the creepage distance. By increasing or decreasing the backing plate between the adjustable I-beam 12 and the angle steel bracket 13, the air gap distance between the high-voltage end electrode 6 and the low-voltage end electrode 7 can be adjusted, so that the distance between the high-voltage end electrode 6 and the low-voltage end electrode 7 can be adjusted. The air gap distance needs to meet the technical requirements; when struck by lightning, the metal oxide (DC zinc oxide resistor 15) inside the arrester body 8 can absorb the energy generated by lightning, and the lightning after the energy is absorbed is connected to the lightning arrester body 8 supporting counter The line leakage is put into the ground, which protects the ±660kV DC transmission system, prevents tripping, and ensures the need for safe power transmission under lightning strikes.

The above embodiments are only used to illustrate and not limit the technical solutions of the present invention. Although the above embodiments have described the present invention in detail, those skilled in the art should understand that the present invention can be modified or replaced without departing from the present invention. Any modifications and partial substitutions in the spirit and scope shall fall within the scope of the claims of the present invention.

Claims (6)

1. one kind ± 660kV DC power transmission line with metal oxide arrester device it is characterised in that include arrester this Body, high pressure termination electrode, low pressure termination electrode, insulator foot, counter, special connecting plate, V string composite insulator, fixture, adjustable work Word steel and angle bar frame；Electric power line pole tower has two groups of line insulators, and first group of line insulator upper end is arranged on transmission of electricity The tower head lower-left end of overhead line structures, hanging yoke plate upper end is arranged on first group of line insulator lower end, special connecting plate upper end peace It is contained in hanging yoke plate lower end, high pressure termination electrode upper end is arranged on special connecting plate lower end, one group of wire of transmission line of electricity is arranged on On hanging yoke plate；Second group of line insulator upper end is arranged on the tower head bottom righthand side of electric power line pole tower, and hanging yoke plate upper end is pacified It is contained in second group of line insulator lower end, another group of wire of transmission line of electricity is arranged on hanging yoke plate；Low pressure termination electrode lower end It is arranged on lightning arrester body upper end, V string composite insulator left part is arranged on lightning arrester body right middle, and V string composite insulator is right Portion is arranged on the tower body left end of electric power line pole tower by fixture, and insulator foot upper end is arranged on lightning arrester body lower end, insulation Base lower end is arranged on I-steel upper end, and I-steel lower end is arranged on angle bar frame upper end, and angle bar frame lower end is arranged on transmission of electricity The tower body left end of overhead line structures, the supporting counter of arrester is arranged on the tower body left end of electric power line pole tower and connecting line connects Ground.

2. ± 660kV DC power transmission line metal oxide arrester device according to claim 1, its feature exists In described lightning arrester body enclosed inside direct current zinc oxide resistance chip.

3. ± 660kV DC power transmission line metal oxide arrester device according to claim 1, its feature exists In, be provided with outside described lightning arrester body by one piece mould pressing technology shape silicon rubber composite sheath, silicon rubber be combined Overcoat from top to bottom adopts the umbrella skirt construction of " small one and large one ".

4. ± 660kV DC power transmission line metal oxide arrester device according to claim 1, its feature exists In, described insulator foot, lightning arrester body is isolated with electric power line pole tower, by the supporting counter connecting line of arrester Lai Thunder and lightning of releasing flows into ground.

5. ± 660kV DC power transmission line metal oxide arrester device according to claim 1, its feature exists In described V string composite insulator lives lightning arrester body by oblique pull in the middle part of lightning arrester body.

6. ± 660kV DC power transmission line metal oxide arrester device according to claim 1, its feature exists Use cooperatively the air gap to adjust between high pressure termination electrode and low pressure termination electrode in, described adjustable I-steel and angle bar frame Distance.