Lightning arrester linked with isolating switch and matched with power transmission line to convert voltage

Abstract

The invention relates to a lightning arrester linked with disconnecting switches and matched with a power transmission line to convert voltage, a 220kV power transmission line and a 110kV power transmission line are both connected with a public power transmission line, the 220kV power transmission line is provided with a first disconnecting switch, the 110kV power transmission line is provided with a second disconnecting switch, and the first disconnecting switch and the second disconnecting switch are connected with the public power transmission line. The upper section lightning arrester and the lower section lightning arrester are arranged in series, the middle connecting part is connected with the switching contact assembly, the switching rod is arranged below the switching contact assembly and is driven by a driving device to rotate and stand up to be in contact with the switching contact assembly, and the driving device sends out a signal through the cooperation of the two disconnecting switches to control start and stop. The upper terminal of the upper section lightning arrester is simultaneously connected with a public power transmission line and an equipment power utilization line; and the lower end of the lower section lightning arrester and the lower end of the switching rod are grounded. According to the voltage conversion condition of the public power transmission line, the disconnecting switches on the power transmission lines with different voltage levels send signals to control the switching rod to rotate so as to realize the conversion of the lightning arrester.

Description

Technical Field

[0001] The invention relates to the technical field of lightning arresters, in particular to a lightning arrester which is linked with an isolating switch and cooperates with a power transmission line to convert voltage. Background Art

[0002] Metal oxide arresters are mainly used to prevent overvoltage in transmission lines from damaging electrical equipment. In recent years, in order to save infrastructure costs, many substations have achieved convenient switching between different voltage levels of transmission lines to achieve the purpose of saving and reducing consumption. In this way, only one public transmission line can be laid, but this also ignores the installation method of the arrester. Since only one voltage level of arrester can be installed on the public line, when the public line voltage level is 220kV, a 220kV arrester needs to be installed. When the public line voltage level is 110kV, a 110kV arrester needs to be installed. Before each line switching, the original arrester needs to be removed and then replaced with an arrester of the corresponding voltage level to achieve the protection function. This requires preparing both 110kV and 220kV arresters at the same time, and exchanging them according to the line voltage level. The operation is cumbersome, inefficient, and there are safety hazards.

[0003] In addition, the prior art mainly realizes the purpose of adapting the arrester to different voltage levels by changing the gap between the arrester electrodes. For example, the patent CN105529617B discloses a line arrester, which includes a discharge body, an insulator and an auxiliary electrode, wherein the discharge body includes a metal electrode and a substrate, the metal electrodes are fixedly arranged on the substrate at equal intervals, and the equal intervals between the metal electrodes form a first discharge gap, and multiple metal electrodes will form multiple first discharge gaps, and the auxiliary electrode and one end of the discharge body constitute a second discharge gap, and another auxiliary electrode is directly connected to the other end of the discharge body or forms a third discharge gap, wherein the auxiliary electrode can rotate, thereby changing the effective discharge length of the discharge body, and then the arrester can be applied to different voltage levels. Another example is the patent CN209071813U discloses a combined disk multi-gap arrester, which forms an external discharge gap between the upper external electrode, the 1st, 2nd...Nth multi-gap string and the lower external electrode 32, and the arrester can select different numbers N according to different voltage level lines.

[0004] However, the above-mentioned lightning arrester cannot meet the conversion requirements of transmission lines of different voltage levels, where the transmission lines mainly include two levels of 110kV and 220kV, and their voltage changes are large, and the above-mentioned lightning arrester cannot be switched in conjunction with the isolation switch on the transmission line to cooperate with the conversion of the transmission line. Summary of the invention

[0005] The object of the present invention is to provide a lightning arrester which is linked with an isolating switch and cooperates with the voltage conversion of the transmission line. According to the voltage conversion situation of the public transmission line, the isolating switch on the transmission line of different voltage levels can send a signal to control the rotation of the switching rod and contact or separate with the switching contact assembly arranged between the upper and lower sections of the lightning arrester, thereby realizing the conversion of the lightning arrester.

[0006] The objective of the present invention is achieved through the following technical solutions:

[0007] A lightning arrester that is linked with an isolating switch and cooperates with a transmission line to convert voltage, comprises a 220kV transmission line, a 110kV transmission line, a public transmission line, an upper section lightning arrester, a lower section lightning arrester, a switching contact assembly and a switching rod, wherein the 220kV transmission line and the 110kV transmission line are both connected to the public transmission line, and the 220kV transmission line is provided with a first isolating switch, and the 110kV transmission line is provided with a second isolating switch, the upper section lightning arrester and the lower section lightning arrester are arranged in series and the middle connection is connected to the switching contact assembly, the switching rod is arranged below the switching contact assembly and is driven to rotate and stand up by a driving device and then contacts the switching contact assembly, the driving device sends a signal to control the start and stop through the cooperation of the first isolating switch and the second isolating switch, the upper terminal of the upper section lightning arrester is simultaneously connected to the public transmission line and the equipment power line, and the lower end of the lower section lightning arrester and the lower end of the switching rod are both grounded.

[0008] The switching contact assembly includes a connecting plate, a shield, a spring pressure plate and a limit plate, wherein the connecting plate is fixed between the upper section lightning arrester and the lower section lightning arrester, the shield, the spring pressure plate and the limit plate are all installed on the connecting plate, and the spring pressure plate is arranged between the shield and the limit plate, wherein the spring pressure plate is provided with a concave switching rod contact portion, and a spring is arranged between the switching rod contact portion and the shield, the limit plate forms a vertical limit plate contact portion close to one side of the spring, the upper end of the switching rod is provided with a connecting terminal, and a limit rod is provided on one side of the connecting terminal, when the switching rod is rotated and erected, the upper end of the connecting terminal contacts the switching rod contact portion, and the limit rod contacts the limit plate contact portion.

[0009] A horizontal pressing piece mounting portion is formed on one side of the spring pressing piece, and a horizontal limiting plate mounting portion is formed on one side of the limiting plate. The shield and the pressing piece mounting portion are arranged on the upper side of the connecting plate from top to bottom in sequence, and the limiting plate mounting portion is arranged on the lower side of the connecting plate, and the shield, the pressing piece mounting portion, the connecting plate and the limiting plate mounting portion are fixed by bolts and nuts.

[0010] The shield is provided with a spring limiting protrusion, and the upper end of the spring is sleeved on the spring limiting protrusion.

[0011] A height adjustment nut is arranged at the lower side of the connecting terminal, a connecting end column is arranged at the upper end of the cutting rod, and the connecting terminal and the height adjustment nut are both sleeved on the connecting end column.

[0012] A pull ring is provided on a side of the connecting terminal away from the limiting rod.

[0013] The switching rod comprises a conductive rod and a jacket, wherein the jacket is sleeved on the outside of the conductive rod, the upper end of the conductive rod is provided with a connecting terminal in contact with the switching contact assembly, the lower end of the conductive rod is rotatably mounted on an articulated seat via a hinge shaft, and the hinge shaft is connected to the driving device.

[0014] The hinge seat is provided with a limit block; the outer coat is provided with an umbrella skirt.

[0015] A lightning arrester bottom plate is provided at the lower end of the lower section lightning arrester, an articulated seat bottom plate is provided at the lower side of the articulated seat, and the lightning arrester bottom plate and the articulated seat bottom plate are connected via a grounding wire row.

[0016] The advantages and positive effects of the present invention are:

[0017] 1. The present invention can control the rotation of the switching rod and contact or separate with the switching contact assembly arranged between the upper and lower sections of the lightning arrester according to the voltage conversion situation of the public transmission line through the disconnector on the transmission line of different voltage levels, thereby realizing the conversion of the lightning arrester. When the public transmission line is 220kV, the first disconnector is closed, the second disconnector is disconnected, the switching rod falls down and separates from the switching contact assembly, and the upper and lower sections of the lightning arrester are connected in series to form a 220kV lightning arrester. When the public transmission line is 110kV, the first disconnector is disconnected, the second disconnector is closed, the switching rod stands up and contacts with the switching contact assembly, and at this time only the 110kV upper section lightning arrester is connected for protection.

[0018] 2. The present invention can ensure that the switching contact assembly is in full contact with the connecting terminal at the upper end of the switching rod through the structural design of the switching contact assembly, and can ensure that the switching rod maintains a vertical contact state.

[0019] 3. A hinge shaft is provided at the lower end of the cutting rod of the present invention, and the hinge shaft is driven to rotate by a driving device. The driving device sends a signal to the control system through the cooperation of the first isolating switch and the second isolating switch to realize control, thereby realizing automatic linkage and coordination between the cutting rod and the two isolating switches. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the disconnected state of the present invention,

[0021] Figure 2 is a schematic diagram of a closed state of the present invention,

[0022] Figure 3 for Figure 2 A in the enlarged view,

[0023] Figure 4 for Figure 2 The enlarged view of point B in the figure,

[0024] Figure 5 for Figure 1 Cross-sectional view of the connection structure between the upper and lower lightning arresters.

[0025] Among them, 1 is a 220kV transmission line, 101 is a first disconnector, 2 is a 110kV transmission line, 201 is a second disconnector, 3 is a public transmission line, 4 is a power equipment line, 5 is an upper section arrester, 6 is a switching contact assembly, 601 is a connecting plate, 602 is a bolt, 603 is a shield, 6031 is a spring limiting protrusion, 604 is a spring pressure piece, 6041 is a pressure piece mounting portion, 6042 is a switching rod contact portion, 605 is a limiting plate, 6051 is a limiting plate mounting portion, 6052 is a limiting plate contact portion, 606 is a nut, 607 is a spring, and 7 is a lower Section lightning arrester, 701 is the lightning arrester base plate, 8 is the grounding wire bar, 9 is the cutting rod, 901 is the connecting terminal, 902 is the hinged seat, 9021 is the hinged seat base plate, 9022 is the hinge shaft, 903 is the limit block, 904 is the pull ring, 905 is the limit rod, 906 is the outer jacket, 9061 is the umbrella skirt, 907 is the conductive rod, 908 is the height adjustment nut, 10 is the upper electrode, 11 is the silicone outer jacket, 12 is the insulating layer, 13 is the resistor, 14 is the core adjustment aluminum rod, 15 is the lower electrode, 16 is the bolt and nut assembly, 17 is the first flange, 18 is the second flange, and 19 is the stud. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings.

[0027] like Figures 1 to 5As shown, the present invention comprises a 220kV transmission line 1, a 110kV transmission line 2, a public transmission line 3, an upper section lightning arrester 5, a lower section lightning arrester 7, a switching contact assembly 6 and a switching rod 9, wherein the 220kV transmission line 1 and the 110kV transmission line 2 are both connected to the public transmission line 3, and the 220kV transmission line 1 is provided with a first isolating switch 101, the 110kV transmission line 2 is provided with a second isolating switch 201, the upper section lightning arrester 5 and the lower section lightning arrester 7 are ...110kV transmission line 2 is provided with a second isolating switch 201, and the upper section lightning arrester 5 and the lower section lightning arrester 7 are connected to the public transmission line 3. The lightning arrester 7 is arranged in series and the middle connection is connected to the switching contact assembly 6. The switching rod 9 is arranged below the switching contact assembly 6 and is driven by a driving device to rotate and stand up and then contact the switching contact assembly 6. The driving device sends a signal to control the start and stop through the cooperation of the first isolating switch 101 and the second isolating switch 201. The upper terminal of the upper lightning arrester 5 is connected to the public transmission line 3 and the equipment power line 4 at the same time. The lower end of the lower lightning arrester 7 and the lower end of the switching rod 9 are both grounded. The upper lightning arrester 5 and the lower lightning arrester 7 are both 110kV lightning arresters. When the present invention is working, Figure 1 As shown, when the public transmission line 3 is 220kV, the first isolating switch 101 is closed, the second isolating switch 201 is opened, the switching rod 9 falls down and separates from the switching contact assembly 6, and the upper section lightning arrester 5 and the lower section lightning arrester 7 are connected in series to form a 220kV lightning arrester access protection. When the public transmission line 3 is 110kV, as shown in FIG. Figure 2 As shown, the first disconnector 101 is disconnected, the second disconnector 201 is closed, the switching rod 9 is rotated and stands up and contacts the switching contact assembly 6, and at this time only the 110kV single-section lightning arrester is connected for protection.

[0028] like Figure 3As shown, in this embodiment, the switching contact assembly 6 includes a connecting plate 601, a shield 603, a spring pressure piece 604 and a limit plate 605, wherein the connecting plate 601 is fixedly arranged between the upper section lightning arrester 5 and the lower section lightning arrester 7, the shield 603, the spring pressure piece 604 and the limit plate 605 are all installed on the connecting plate 601, and the spring pressure piece 604 is arranged between the shield 603 and the limit plate 605, wherein the spring pressure piece 604 is provided with a concave switching rod contact portion 6042, and a spring 607 is provided between the switching rod contact portion 6042 and the shield 603, The limiting plate 605 forms a vertical limiting plate contact portion 6052 near one side of the spring 607. The upper end of the cutting rod 9 is provided with a connecting terminal 901, and a limiting rod 905 is provided on one side of the connecting terminal 901. When the cutting rod 9 is rotated and erected, the upper end of the connecting terminal 901 contacts the cutting rod contact portion 6042, and the limiting rod 905 contacts the limiting plate contact portion 6052, thereby achieving electrical connection. At the same time, the spring 607 applies a downward pressure to the spring pressing sheet 604 to ensure that the cutting rod 9 remains vertical and the connecting terminal 901 is firmly in contact.

[0029] like Figure 3 As shown, in this embodiment, a horizontal pressing piece mounting portion 6041 is formed on one side of the spring pressing piece 604, and a horizontal limiting plate mounting portion 6051 is formed on one side of the limiting plate 605. The protective cover 603 and the pressing piece mounting portion 6041 are arranged on the upper side of the connecting plate 601 in sequence from top to bottom, and the limiting plate mounting portion 6051 is arranged on the lower side of the connecting plate 601, and the protective cover 603, the pressing piece mounting portion 6041, the connecting plate 601 and the limiting plate mounting portion 6051 are fixed by bolts 602 and nuts 606.

[0030] like Figure 3 As shown, in this embodiment, a spring limiting protrusion 6031 is provided on the shield 603, and the upper end of the spring 607 is sleeved on the spring limiting protrusion 6031 to achieve limiting.

[0031] like Figure 3 As shown, in this embodiment, a height adjustment nut 908 is provided on the lower side of the connecting terminal 901, a connecting end column is provided on the upper end of the cutting rod 9, and the connecting terminal 901 and the height adjustment nut 908 are both placed on the connecting end column. Screwing the height adjustment nut 908 can drive it to move along the connecting end column to change the height, thereby driving the connecting terminal 901 to change the height. In this way, the present invention can adjust the clamping force between the spring 607, the spring pressure sheet 604 and the connecting terminal 901 according to actual conditions, thereby further ensuring the firm contact and electrical connection between the connecting terminal 901 and the spring pressure sheet 604 and the limiting plate 605.

[0032] In addition, Figure 3 As shown, in this embodiment, a pull ring 904 is provided on the side of the connecting terminal 901 away from the limiting rod 905. The present invention can realize the rotation of the cutting rod 9 by pulling the pull ring 904 through an insulating rod with a pull hook at the front according to actual needs, such as when the cutting rod 9 is pressed too tightly and cannot fall down or manual switching is required.

[0033] like Figures 3-4 As shown, in this embodiment, the cutting rod 9 includes a conductive rod 907 and a jacket 906, wherein the jacket 906 is made of silicone material and is sleeved on the outside of the conductive rod 907, and the upper end of the conductive rod 907 is provided with the connecting end rod connected to the connecting terminal 901, and as shown Figure 4 As shown, the lower end of the conductive rod 907 is rotatably mounted on an articulated seat 902 via a hinge shaft 9022, and the hinge shaft 9022 is connected to the driving device. The driving device drives the hinge shaft 9022 to rotate, thereby driving the cutting rod 9 to rotate. The driving device can use a servo motor or other devices as needed. In addition, a limit block 903 is provided on the articulated seat 902 to limit the downward swing displacement of the cutting rod 9.

[0034] like Figure 3 As shown, in this embodiment, the outer jacket 906 is staggered with umbrella skirts 9061 of different sizes.

[0035] like Figure 4 As shown, in this embodiment, the lower end of the lower section lightning arrester 7 is provided with a lightning arrester base plate 701, the lower side of the hinged seat 902 is provided with an hinged seat base plate 9021, and the lightning arrester base plate 701 and the hinged seat base plate 9021 are connected through a grounding wire row 8.

[0036] The working principle of the present invention is:

[0037] The first isolating switch 101 and the second isolating switch 201 of the present invention are both commercially available products, and the linkage between them and the switching rod 9 is realized through software control. Because the public transmission line 3 has only one voltage level, the first isolating switch 101 and the second isolating switch 201 cannot be closed at the same time. Before the first isolating switch 101 is closed (the 220kV transmission line is connected, and the second isolating switch 201 is in the disconnected state at this time), a signal will be sent to the control system, and the control system will control the driving device to drive the switching rod 9 to rotate downward to make it in the disconnected state. At this time, the upper lightning arrester 5 and the lower lightning arrester 7 are connected in series to realize the 2 20kV line operation protection, and when the first isolating switch 101 is disconnected, the switching rod 9 is still in the disconnected state, and then before the second isolating switch 201 is closed (the 110kV transmission line is connected), a signal will be sent to the control system, and the control system will control the driving device to drive the switching rod 9 to rotate upward and make the connection terminal 901 at its upper end contact with the switching contact assembly 6 to achieve electrical connection. At this time, only the upper lightning arrester 5 is connected and protects the 110kV line, and when the second isolating switch 201 is disconnected, a signal will be sent to the control system, and the control system will control the driving device to drive the switching rod 9 to rotate downward and disconnect. In addition, the switching rod 9 is driven by the driving device (servo motor) to perform switching movement. Whether the two isolating switches are closed or disconnected, the control system will determine the current state of the switching rod 9 to avoid false triggering.

[0038] And as Figure 3 As shown, the present invention needs to ensure that when the switching rod 9 is erected, the connecting terminal 901 at its upper end is in full contact with the switching contact assembly 6, thereby ensuring electrical connection. Therefore, in the switching contact assembly 6 of the present invention, the connecting terminal 901, the spring pressure piece 604, and the connecting plate 601 form a first layer of contact and connection. The limiting rod 905, the limiting plate 605, and the connecting plate 601 on one side of the connecting terminal 901 limit the displacement of the switching rod 9 while forming a second layer of contact and connection. The connecting terminal 901, the spring pressure piece 604, the spring 607, and the shield 603 (made of stainless steel) form a third layer of contact and connection. In addition, the spring pressure piece 604 presses the connecting terminal 901 through the elastic force of the spring 607, thereby ensuring that the connecting terminal 901 is in full contact with the switching contact assembly 6. The height of the connecting terminal 901 can also be adjusted by screwing the height adjustment nut 908 as needed, which can further ensure that the connecting terminal 901 is in contact with the switching contact assembly 6.

[0039] like Figure 5As shown, in this embodiment, the upper section lightning arrester 5 and the lower section lightning arrester 7 have the same structure, both include a silicone jacket 11 and a core body arranged in the silicone jacket 11, the core body includes an upper electrode 10, a resistor 13, a core adjustment aluminum rod 14 and a lower electrode 15 arranged in sequence from top to bottom, and an insulating layer 12 is provided between the core body and the silicone jacket, the lower electrode 15 at the lower end of the upper section lightning arrester 5 is connected to the upper electrode 10 at the upper end of the lower section lightning arrester 7 through a stud 19, and a first flange 17 is provided at the lower end of the upper section lightning arrester 5, and a second flange 18 is provided at the upper end of the lower section lightning arrester 7, the connecting plate 601 is provided between the first flange 17 and the second flange 18, and the first flange 17, the connecting plate 601 and the second flange 18 are fixedly connected by a bolt and nut assembly 16.

Claims

1. A lightning arrester that is linked with an isolating switch and cooperates with a transmission line to convert voltage, characterized in that: The invention comprises a 220 kV transmission line (1), a 110 kV transmission line (2), a public transmission line (3), an upper section lightning arrester (5), a lower section lightning arrester (7), a switching contact assembly (6) and a switching rod (9), wherein the 220 kV transmission line (1) and the 110 kV transmission line (2) are both connected to the public transmission line (3), and the 220 kV transmission line (1) is provided with a first isolating switch (101), the 110 kV transmission line (2) is provided with a second isolating switch (201), the upper section lightning arrester (5) and the lower section lightning arrester (7) are connected to the public transmission line (3), and the 220 kV transmission line (1) is provided with a first isolating switch (101), the 110 kV transmission line (2) is provided with a second isolating switch (201), and the upper section lightning arrester (5) and the lower section lightning arrester (7) are connected to the public transmission line (3). The lightning arresters (7) are arranged in series and the middle connection is connected to the switching contact assembly (6). The switching rod (9) is arranged below the switching contact assembly (6) and is driven by a driving device to rotate and stand up and then contact the switching contact assembly (6). The driving device sends a signal to control the start and stop through the cooperation of the first isolating switch (101) and the second isolating switch (201). The upper terminal of the upper lightning arrester (5) is simultaneously connected to the public transmission line (3) and the equipment power line (4). The lower end of the lower lightning arrester (7) and the lower end of the switching rod (9) are both grounded.

2. The lightning arrester that is linked with the isolating switch and cooperates with the power transmission line to convert voltage according to claim 1 is characterized in that: The switching contact assembly (6) comprises a connecting plate (601), a shield (603), a spring pressure piece (604) and a limit plate (605), wherein the connecting plate (601) is fixedly arranged between the upper lightning arrester (5) and the lower lightning arrester (7), the shield (603), the spring pressure piece (604) and the limit plate (605) are all installed on the connecting plate (601), and the spring pressure piece (604) is arranged between the shield (603) and the limit plate (605), wherein the spring pressure piece (604) is provided with a concave switching rod contact portion (6042), and the A spring (607) is provided between the cutting rod contact portion (6042) and the protective cover (603); a vertical limiting plate contact portion (6052) is formed on the side of the limiting plate (605) close to the spring (607); a connecting terminal (901) is provided on the upper end of the cutting rod (9); and a limiting rod (905) is provided on one side of the connecting terminal (901); when the cutting rod (9) rotates and stands up, the upper end of the connecting terminal (901) contacts the cutting rod contact portion (6042), and the limiting rod (905) contacts the limiting plate contact portion (6052).

3. The arrester according to claim 2, which is linked with the isolating switch and cooperates with the power transmission line to convert the voltage, is characterized in that: A horizontal pressing piece mounting portion (6041) is formed on one side of the spring pressing piece (604), and a horizontal limiting plate mounting portion (6051) is formed on one side of the limiting plate (605). The protective cover (603) and the pressing piece mounting portion (6041) are sequentially arranged on the upper side of the connecting plate (601) from top to bottom, and the limiting plate mounting portion (6051) is arranged on the lower side of the connecting plate (601). The protective cover (603), the pressing piece mounting portion (6041), the connecting plate (601) and the limiting plate mounting portion (6051) are fixed by bolts (602) and nuts (606).

4. The lightning arrester that is linked with the isolating switch and cooperates with the power transmission line to convert voltage according to claim 2, characterized in that: The shield (603) is provided with a spring limiting protrusion (6031), and the upper end of the spring (607) is sleeved on the spring limiting protrusion (6031).

5. The lightning arrester that is linked with the isolating switch and cooperates with the power transmission line to convert voltage according to claim 2, characterized in that: A height adjustment nut (908) is provided at the lower side of the connection terminal (901), a connection terminal column is provided at the upper end of the cutting rod (9), and the connection terminal (901) and the height adjustment nut (908) are both sleeved on the connection terminal column.

6. The lightning arrester that is linked with the isolating switch and cooperates with the power transmission line to convert voltage according to claim 1, characterized in that: A pull ring (904) is provided on the side of the connection terminal (901) away from the limiting rod (905).

7. The lightning arrester that is linked with the isolating switch and cooperates with the power transmission line to convert voltage according to claim 1, characterized in that: The switching rod (9) comprises a conductive rod (907) and a jacket (906), wherein the jacket (906) is sleeved on the outside of the conductive rod (907), the upper end of the conductive rod (907) is provided with a connecting terminal (901) for contacting the switching contact assembly (6), and the lower end of the conductive rod (907) is rotatably mounted on a hinge seat (902) via a hinge shaft (9022), and the hinge shaft (9022) is connected to the driving device.

8. The lightning arrester that is linked with the isolating switch and cooperates with the power transmission line to convert voltage according to claim 7, characterized in that: The hinge seat (902) is provided with a limit block (903); the outer cover (906) is provided with an umbrella skirt (9061).

9. The lightning arrester that is linked with the isolating switch and cooperates with the power transmission line to convert voltage according to claim 7, characterized in that: The lower end of the lower section arrester (7) is provided with an arrester base plate (701), the lower side of the hinged seat (902) is provided with an hinged seat base plate (9021), and the arrester base plate (701) and the hinged seat base plate (9021) are connected via a grounding wire row (8).

10. The lightning arrester that is linked with the isolating switch and cooperates with the power transmission line to convert voltage according to claim 1, characterized in that: When the public transmission line (3) is 220 kV, the first isolating switch (101) is closed, the second isolating switch (201) is opened, the switching rod (9) falls down and separates from the switching contact assembly (6), and the upper section lightning arrester (5) and the lower section lightning arrester (7) are connected in series to form a 220 kV lightning arrester access protection. When the public transmission line (3) is 110 kV, the first isolating switch (101) is opened, the second isolating switch (201) is closed, the switching rod (9) rotates and stands up and contacts with the switching contact assembly (6), and at this time, only the 110 kV upper section lightning arrester (5) is connected for protection.

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