Telescopic intelligent overvoltage protector

Abstract

The present application relates to the field of high-voltage electrical apparatus, in particular to a bushing type intelligent overvoltage protector, in which the lightning arrester bushing assembly is characterized in that: the bushing protrudes into / out of the base at both ends, the capacitive screens between the innermost / outermost layers of the bushing lead out first conductors and are electrically connected to the high-voltage power supply / ground respectively; the phase-to-ground lightning arrester is arranged outside the bushing and outside the base, the capacitive screens between the innermost / outermost layers of the phase-to-ground lightning arrester support tube lead out second conductors and are electrically connected to the high-voltage power supply / ground respectively; the outer ends of the conductors of the three groups of bushings are electrically connected to the three-phase power supply, the inner ends are electrically connected to the ground through a group of phase-to-ground lightning arresters, a group of phase-to-phase lightning arresters are connected in series between any two groups of conductors, the capacitive screens between the innermost / outermost layers of the phase-to-phase lightning arrester support tube of the phase-to-phase lightning arrester lead out third conductors and are electrically connected to the high-voltage power supply and the ground respectively; the layout of the bushing type intelligent overvoltage protector is reasonable and the state of the bushing type intelligent overvoltage protector can be monitored.

Description

Technical Field

[0001] This invention relates to the field of high-voltage electrical appliances, and more specifically to a bushing-type intelligent overvoltage protector. Background Technology

[0002] Existing six-column overvoltage protectors have the following problems:

[0003] 1. The lack of necessary testing methods makes it impossible to monitor their work and health status;

[0004] 2. The structural layout is unreasonable, and the overall space occupied is large;

[0005] 3. The base structure is made by injection molding, making it impossible to maintain or replace the components inside the base. Summary of the Invention

[0006] The purpose of this invention is to overcome at least one defect of the prior art and provide a bushing-type intelligent overvoltage protector with a reasonable layout and the ability to monitor its own status.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A bushing-type intelligent overvoltage protector includes a base, three sets of surge arrester bushing assemblies, and three sets of phase-to-phase surge arresters installed in the base.

[0009] The surge arrester bushing assembly includes a bushing and a phase-to-ground surge arrester. One end of the bushing is inserted into the base, and the other end is located outside the base. The phase-to-ground surge arrester is installed outside the base and sleeved on the outside of the bushing. The bushing includes a conductor and a bushing insulating core wrapped around the conductor. The bushing insulating core includes multiple capacitor screens alternately arranged with the insulating layer. The innermost and outermost capacitor screens are electrically connected to the high-voltage power supply and the ground phase, respectively. A first conductor is led out from the capacitor screen between the innermost and outermost layers. The phase-to-ground surge arrester includes a phase-to-ground surge arrester support tube and a... Multiple stacked annular second valve plates are arranged inside the phase-to-ground surge arrester support tube, with each second valve plate sleeved outside the tube. The phase-to-ground surge arrester support tube includes multiple capacitor screens alternately arranged with the insulation layer. The innermost capacitor screen is electrically connected to the high-voltage power supply, and the outermost capacitor screen is electrically connected to the ground phase. A second conductor is led out from the capacitor screen between the innermost and outermost layers. One end of each of the three sets of conductors is used to connect to the three phases of the high-voltage power supply, and the other end of each is connected to the ground phase through a set of phase-to-ground surge arresters. A set of phase-to-phase surge arresters is connected in series between any two sets of conductors.

[0010] The phase-to-phase surge arrester includes a phase-to-phase surge arrester support tube and multiple stacked first valve plates disposed inside the phase-to-phase surge arrester support tube. The phase-to-phase surge arrester support tube includes multiple capacitor screens alternately disposed with the insulation layer. The innermost and outermost capacitor screens are respectively connected to the high-voltage power supply and the ground phase. A third conductor is led out from the capacitor screen between the innermost and outermost layers.

[0011] Furthermore, the capacitor screen of the phase-to-ground surge arrester support tube forms two capacitors connected in series between the high-voltage power supply and the ground phase. The two capacitors are connected in parallel with the second valve plate group formed by the second valve plate. The two capacitors are capacitor C0 and capacitor C1, respectively.

[0012] Furthermore, in the phase-to-ground surge arrester support tube, from the innermost capacitor screen to the outermost capacitor screen, each one is offset towards the side where the base is located in a stepped manner.

[0013] Furthermore, the phase-to-ground surge arrester support tube also includes a first intermediate capacitor screen located between its outermost and innermost capacitor screens. At least one first intermediate capacitor screen includes multiple first sub-capacitor screens arranged side by side at intervals along the axial direction of the phase-to-ground surge arrester. The radial distance between each first sub-capacitor screen and the conductor of the corresponding bushing is the same.

[0014] Furthermore, the capacitor screen of the phase-to-phase arrester support tube forms capacitors C2, C3 and C4. After C2 and C3 are connected in series, they are connected in parallel with the first valve plate group formed by the first valve plate of the phase-to-phase arrester. The node between C2 and C3 is electrically connected to the ground phase through capacitor C4.

[0015] Furthermore, the phase-to-phase arrester support tube includes a first capacitor bank group, a second capacitor bank group, and a third capacitor bank group. The first and second capacitor bank groups are arranged side by side along the axial direction of the phase-to-phase arrester, and the third capacitor bank group is wrapped around the first and second capacitor bank groups.

[0016] In the first capacitor screen group, the capacitor screens from the innermost layer to the outermost layer are offset in a stepped manner toward the side where the second capacitor screen group is located. The capacitor screens of the second capacitor screen group and the first capacitor screen group are symmetrical to each other. The innermost capacitor screens of the first capacitor screen group and the second capacitor screen group are electrically connected to the two ends of the first valve plate group formed by the first valve plate of the phase-to-phase arrester.

[0017] Furthermore, in the third capacitor bank group, each capacitor bank has its ends tapering in a stepped manner from the innermost capacitor bank to the outermost capacitor bank towards the axial center of the phase-to-phase arrester; and / or, the first capacitor bank group includes a second intermediate capacitor bank located between its innermost and outermost capacitor banks, and at least one second intermediate capacitor bank includes multiple second sub-capacitor banks arranged side-by-side and spaced apart along the axial direction of the phase-to-phase arrester, with each second sub-capacitor bank having the same radial distance from the axis of the phase-to-phase arrester;

[0018] Furthermore, the bushing also includes a bushing support tube, which includes an upper support tube and a lower support tube used in conjunction. The bushing insulating core includes an upper part of the core protruding outside the base and a lower part of the core inserted inside the base. The upper support tube is sleeved outside the upper part of the core and located between the upper part of the core and the second valve plate of the phase-to-ground surge arrester. The lower support tube is sleeved outside the lower part of the core and located inside the base.

[0019] Furthermore, the phase-to-ground surge arrester also includes a lower equipotential bonding ball, an upper equipotential bonding ball, a second conductive block, a spring, a skirt, an upper flange, and a lower flange. The upper equipotential bonding ball is located at the upper end of the phase-to-ground surge arrester and has an opening for the conductor of the bushing to pass through. The upper end of the phase-to-ground surge arrester support tube is inserted into the upper equipotential bonding ball. The second conductive block is an annular conductive block located inside the upper equipotential bonding ball and sleeved on the upper end of the bushing. The spring is located inside the phase-to-ground surge arrester support tube and between the second conductive block and the second valve plate of the phase-to-ground surge arrester. The upper flange is connected to the lower end of the phase-to-ground surge arrester support tube and the lower half of the upper support tube, respectively. The lower flange is connected to the base and the upper flange. The skirt is sleeved outside the phase-to-ground surge arrester support tube and is located between the upper equipotential bonding ball and the upper flange. The lower equipotential bonding ball is located at the lower end of the bushing and inserted into the lower end of the lower half of the support tube. The lower equipotential bonding ball has an opening for the conductor of the bushing to pass through.

[0020] Furthermore, the phase-to-phase surge arrester also includes a third conductive block, with two third conductive blocks respectively disposed inside the two ends of the phase-to-phase surge arrester support tube to press against the first valve plate of the phase-to-phase surge arrester.

[0021] Furthermore, the three sets of bushings are A-phase bushings, B-phase bushings, and C-phase bushings, and are arranged side-by-side at intervals along the radial direction of each bushing; the three sets of inter-phase surge arresters are the first inter-phase surge arrester, the second inter-phase surge arrester, and the third inter-phase surge arrester, with the axial direction of the inter-phase surge arrester perpendicular to the axial direction of the bushing. The two ends of the first inter-phase surge arrester are respectively located near the lower ends of the A-phase bushing and the B-phase bushing, and the two ends of the second inter-phase surge arrester are respectively located near the lower ends of the B-phase bushing and the C-phase bushing. The first inter-phase surge arrester and the second inter-phase surge arrester are coaxial, and the three sets of bushings are located on the upper side of the axial direction of the first inter-phase surge arrester and the second inter-phase surge arrester, while the third inter-phase surge arrester is located on the lower side of the axial direction of the first inter-phase surge arrester and the second inter-phase surge arrester.

[0022] Furthermore, the overvoltage protector also includes a first conductive element, a second conductive element, and a third conductive element. Three sets of phase-to-phase arresters are located between the first conductive element and the second conductive element. The lower end of the conductor of phase A bushing and the end of the first phase-to-phase arrester near phase A bushing are electrically connected to one end of the first conductive element, and the other end of the first conductive element is electrically connected to one end of the third phase-to-phase arrester. The lower end of the conductor of phase B bushing is electrically connected to the end of the first phase-to-phase arrester and the end of the second phase-to-phase arrester near the lower end of phase B bushing through the third conductive element. The lower end of the conductor of phase C bushing and the end of the second phase-to-phase arrester near the lower end of phase C bushing are electrically connected to one end of the second conductive element, and the other end of the third phase-to-phase arrester is electrically connected to the other end of the second conductive element.

[0023] Furthermore, the base includes a housing and an insulating medium filled within the housing, the housing being electrically connected to ground.

[0024] Furthermore, the housing also includes a housing aperture for injecting an insulating medium therein.

[0025] The bushing-type intelligent overvoltage protector of the present invention has lead wires extending from its bushing, phase-to-ground surge arrester, and phase-to-phase surge arrester, which can output signals for equipment detection, realize real-time monitoring of the working status of the three components, promptly detect and resolve problems, and ensure the reliable and stable operation of the overvoltage protector. In addition, the three sets of phase-to-ground surge arresters are set outside the base and respectively sleeved on the three sets of bushings, which improves the overall structural compactness of the overvoltage protector and reduces the space requirements of the base.

[0026] Furthermore, the bushing-type intelligent overvoltage protector in this embodiment has a reasonable and compact layout, which helps to reduce the overall size of the base and ensures a reasonable spacing between each surge arrester bushing assembly and each phase-to-phase surge arrester.

[0027] In addition, the base adopts a structure of shell + insulating medium, which facilitates the maintenance and replacement of the phase-to-phase surge arrester inside the base, and the insulation performance of the base can be guaranteed by replacing the insulating medium. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the bushing-type intelligent overvoltage protector of the present invention;

[0029] Figure 2 This is a schematic diagram of the arrangement of the capacitor screen inside the phase-to-ground surge arrester support tube of the present invention.

[0030] Figure 3 This is a schematic diagram of the arrangement of the capacitor screen inside the support tube of the phase-to-phase surge arrester of the present invention.

[0031] Figure 4 This is the circuit diagram of the bushing-type intelligent overvoltage protector of the present invention.

[0032] Explanation of reference numerals in the attached figures

[0033] First phase-to-ground surge arrester 1a; Second phase-to-ground surge arrester 1b; Third phase-to-ground surge arrester 1c; Conductor 100; Bushing insulating core 101; First conductor 1010; Upper half support tube 102; Lower half support tube 103; Lower equalizing ball 104; Upper equalizing ball 110; Second conductive block 111; Spring 112; Umbrella skirt 113; Phase-to-ground surge arrester support tube 114; Second conductor 1140; Second valve plate 115; Upper flange 116; Lower flange 117; Phase A bushing 2a; Phase B bushing 2b; Phase C bushing 2c; First phase-to-phase surge arrester ab; Second phase-to-phase surge arrester bc; Third phase-to-phase surge arrester ac; 20 Phase-to-phase surge arrester support tube; Third conductor 200; 21 First valve plate; 22 Third conductive block; Housing 3; Housing hole 30; Insulating medium 4; First conductive element 50; Second conductive element 51; Third conductive element 6. Detailed Implementation

[0034] The following embodiments, in conjunction with the accompanying drawings, further illustrate specific implementations of the bushing-type intelligent overvoltage protector of the present invention. The bushing-type intelligent overvoltage protector of the present invention is not limited to the descriptions in the following embodiments.

[0035] like Figure 1-4As shown, this is a bushing-type intelligent overvoltage protector of the present invention, which includes a base, three sets of surge arrester bushing assemblies, and three sets of phase-to-phase surge arresters disposed within the base. The surge arrester bushing assemblies are fixedly connected to the base, and each assembly includes a bushing and a surge arrester. One end of the bushing is inserted into the base, and the other end is located outside the base. The phase-to-ground surge arresters are disposed outside the base and sleeved on the outside of the bushing. The bushing includes a conductor 100 and a bushing insulating core 101 wrapped around the conductor 100. The bushing insulating core 101 includes multiple capacitor screens alternately arranged with the insulation layer. The innermost and outermost capacitor screens are respectively connected to high voltage... The voltage power supply is electrically connected to the ground phase. A first conductor 1010 is led out from the capacitor screen between the innermost and outermost layers, preferably through the capacitor screen of the second outermost layer, for outputting signals for equipment detection (e.g., partial discharge detection, harmonic monitoring, resistive current monitoring, discharge count, etc.). The phase-to-ground surge arrester includes a phase-to-ground surge arrester support tube 114 and multiple annular second valve plates 115 stacked inside the phase-to-ground surge arrester support tube 114. Each second valve plate 115 is stacked sequentially along the axial direction of the phase-to-ground surge arrester and sleeved on the outside of the corresponding sleeve. Preferably, the phase-to-ground surge arrester support tube 114 includes an insulating layer. Multiple capacitor banks are arranged alternately. The innermost and outermost capacitor banks are connected to the high-voltage power supply and ground, respectively. A second conductor 1140 is led out from the capacitor bank between the innermost and outermost layers, preferably through the next outermost capacitor bank, for outputting signals for equipment detection (e.g., partial discharge detection, harmonic monitoring, resistive current monitoring, discharge count, etc.). One end of each of the three sets of conductors 100 is connected to the three-phase power supply, and the other end of each is connected to ground through a set of phase-to-ground surge arresters. A phase-to-phase surge arrester is connected in series between any two sets of conductors 100. The phase-to-phase surge arrester includes... The phase-to-phase arrester support tube 20 and multiple first valve plates 21 stacked inside the phase-to-phase arrester support tube 20 are arranged in sequence along the axial direction of the phase-to-phase arrester. The phase-to-phase arrester support tube 20 includes multiple capacitor screens alternately arranged with the insulation layer. The innermost and outermost capacitor screens are electrically connected to the high-voltage power supply and the ground phase, respectively. A third conductor 200 is led out from the capacitor screen between the innermost and outermost layers. For example, the third conductor 200 can be led out through the capacitor screen of the second outermost layer for outputting signals for equipment detection (such as partial discharge detection, harmonic monitoring, resistive current monitoring, discharge count, etc.).

[0036] This invention relates to a bushing-type intelligent overvoltage protector, in which the bushing, phase-to-ground surge arrester, and phase-to-phase surge arrester all have lead wires that can output signals for equipment detection, enabling real-time monitoring of the operating status of the three components. This allows for timely detection and resolution of problems, ensuring the reliable and stable operation of the overvoltage protector. Furthermore, the three sets of phase-to-ground surge arresters are mounted outside the base and respectively fitted onto the three sets of bushings, which improves the overall structural compactness of the overvoltage protector and reduces the space requirements for the base.

[0037] like Figure 1 As shown, in this embodiment of the bushing-type intelligent overvoltage protector, the three bushings are A-phase bushing 2a, B-phase bushing 2b, and C-phase bushing 2c; the three phase-to-ground surge arresters are the first phase-to-ground surge arrester 1a, the second phase-to-ground surge arrester 1b, and the third phase-to-ground surge arrester 1c; and the three phase-to-phase surge arresters are the first phase-to-phase surge arrester ab, the second phase-to-phase surge arrester bc, and the third phase-to-phase surge arrester ac. The first phase-to-ground surge arrester 1a is sleeved outside the A-phase bushing 2a. The A-phase of the high-voltage power supply is electrically connected to the ground phase through the conductor 100 of the A-phase bushing 2a and the first phase-to-ground surge arrester 1a in sequence. The second phase-to-ground surge arrester 1b is sleeved inside the B-phase bushing 2a. Externally, phase B of the high-voltage power supply is connected to the ground phase sequentially through conductor 100 of phase B bushing 2b and second phase ground arrester 1b. Third phase ground arrester 1c is installed outside phase C bushing 2c. Phase C of the high-voltage power supply is connected to the ground phase sequentially through conductor 100 of phase C bushing 2c and third phase ground arrester 1c. A first phase-to-phase arrester ab is connected in series between conductors 100 of phase A bushing 2a and phase B bushing 2b. A second phase-to-phase arrester bc is connected in series between conductors 100 of phase B bushing 2b and phase C bushing 2c. A third phase-to-phase arrester ac is connected in series between conductors 100 of phase A bushing 2a and phase C bushing 2c.

[0038] like Figure 1 The image shows one layout of the bushing-type intelligent overvoltage protector in this embodiment:

[0039] The three sets of bushings are arranged side-by-side at intervals along the radial direction of each bushing. The axial direction of the phase-to-phase surge arrester is perpendicular to the axial direction of the bushing, that is, parallel to the radial direction of the bushing. The two ends (axial ends) of the first phase-to-phase surge arrester ab are respectively located near the lower ends of phase A bushing 2a and phase B bushing 2b. The two ends (axial ends) of the second phase-to-phase surge arrester bc are respectively located near the lower ends of phase B bushing 2b and phase C bushing 2c. The first phase-to-phase surge arrester ab and the second phase-to-phase surge arrester bc are coaxial. The three sets of bushings are located on the upper side of the axis of the first phase-to-phase surge arrester ab and the second phase-to-phase surge arrester bc. The third phase-to-phase surge arrester ac is located on the lower side of the axis of the first phase-to-phase surge arrester ab and the second phase-to-phase surge arrester bc. In this embodiment, the bushing-type intelligent overvoltage protector has a reasonable and compact layout, which helps to reduce the overall size of the base and ensures a reasonable spacing between each surge arrester bushing assembly and each phase-to-phase surge arrester.

[0040] like Figure 1As shown, the bushing-type intelligent overvoltage protector in this embodiment also includes a first conductive element 50, a second conductive element 51, and a third conductive element 6. Three sets of phase-to-phase surge arresters are located between the first conductive element 50 and the second conductive element 51. The lower end of the conductor 100 of phase A bushing 2a and the end of the first phase-to-phase surge arrester ab near phase A bushing 2a are electrically connected to one end of the first conductive element 50, and the other end of the first conductive element 50 is electrically connected to one end of the third phase-to-phase surge arrester ac. The lower end of the conductor 100 of phase B bushing 2b is electrically connected to the end of the first phase-to-phase surge arrester ab and the end of the second phase-to-phase surge arrester bc near the lower end of phase B bushing 2b through the third conductive element 6. The lower end of the conductor 100 of phase C bushing 2c and the end of the second phase-to-phase surge arrester bc near the lower end of phase C bushing 2c are electrically connected to one end of the second conductive element 51, and the other end of the third phase-to-phase surge arrester ac is electrically connected to the other end of the second conductive element 51. Furthermore, the first conductive element 50, the second conductive element 51, and the third conductive element 6 are all cut and bent from metal conductive sheet. The first conductive element 50, the second conductive element 51, and the third conductive element 6 have simple structures and are easy to connect, simplifying the connection structure between each surge arrester bushing assembly and the phase-to-phase surge arrester assembly. The connection operation is simple and the connection reliability is high.

[0041] like Figure 1 As shown, the bushing also includes a bushing support tube, which includes an upper support tube 102 and a lower support tube 103 used in conjunction. The bushing insulating core 101 includes an upper part of the core protruding outside the base and a lower part of the core inserted inside the base. The upper support tube 102 is sleeved outside the upper part of the core and located between the upper part of the core and the second valve plate 115 of the phase-to-ground surge arrester. The lower support tube 103 is sleeved outside the lower part of the core and located inside the base. The lower end of the upper support tube 102 and the upper end of the lower support tube 103 are matched with each other, and the two wrap around the entire bushing insulating core.

[0042] like Figure 2 and 4As shown, in the phase-to-ground surge arrester support tube 114, each capacitor screen and the conductor 100 of the corresponding bushing are coaxially arranged and are all ring-shaped capacitor screens. From the innermost capacitor screen to the outermost capacitor screen, they are offset towards the base side in a step-like manner. That is, the end of each capacitor screen away from the base is offset towards the base side in a step-like manner from the innermost to the outermost capacitor screen. Moreover, the end of each capacitor screen close to the base is also offset towards the base side in a step-like manner from the innermost to the outermost capacitor screen. Preferably, the phase-to-ground surge arrester support tube 114 includes a first intermediate capacitor screen located between its outermost and innermost capacitor screens. At least one first intermediate capacitor screen includes multiple first sub-capacitor screens arranged side-by-side at intervals along the axial direction of the phase-to-ground surge arrester. Each first sub-capacitor screen is radially distanced from the conductor 100 of the corresponding bushing, that is, each first sub-capacitor screen is an annular capacitor screen with the same radius. All the capacitor screens of the phase-to-ground surge arrester support tube 114 form two capacitors connected in series between the high-voltage power supply and the ground phase and in parallel with the second valve plate group formed by the second valve plate 115. The two capacitors are capacitor C0 and capacitor C1, respectively. The second conductor 1140 is led out from between capacitor C0 and capacitor C1. Of course, as another embodiment, the phase-to-ground surge arrester support tube 114 may not have a first intermediate capacitor screen composed of multiple first sub-capacitor screens.

[0043] like Figure 1 As shown, the phase-to-ground surge arrester also includes a lower equipotential bonding ball 104, an upper equipotential bonding ball 110, a second conductive block 111, a spring 112, a skirt 113, an upper flange 116, and a lower flange 117. The upper equipotential bonding ball 110 is located at the upper end of the phase-to-ground surge arrester and has an equipotential bonding ball opening for the conductor 100 of the corresponding bushing to pass through. The upper end of the phase-to-ground surge arrester support tube 114 is inserted into the upper equipotential bonding ball 110. The second conductive block 111 is an annular conductive block, located inside the upper equipotential bonding ball 110 and sleeved on the upper end of the corresponding bushing. The spring is located inside the phase-to-ground surge arrester support tube 114 and is located at the upper end of the second conductive block 112. The second valve plates 115 of the phase-to-ground surge arrester are pressed together between block 111 and the second valve plate 115. The upper flange 116 is connected to the lower end of the phase-to-ground surge arrester support tube 114 and the upper half support tube 102, respectively. The lower flange 117 is connected to the base and the upper flange 116. The umbrella skirt 113 is sleeved on the outside of the phase-to-ground surge arrester support tube 114 and is located between the upper equipotential ball 110 and the upper flange 116. The lower equipotential ball 104 is set at the lower end of the corresponding sleeve and inserted into the lower half support tube 103. The lower equipotential ball 104 has a lower equipotential ball opening for the conductor 100 of the corresponding sleeve to pass through. Furthermore, the lower flange 117 is fixedly connected to the outer shell 3 of the base.

[0044] like Figure 3 and 4As shown, the phase-to-phase arrester support tube 20 includes a first capacitor bank group, a second capacitor bank group, and a third capacitor bank group. The first and second capacitor bank groups are arranged side-by-side along the axial direction of the phase-to-phase arrester, and the third capacitor bank group wraps around the first and second capacitor bank groups. In the first capacitor bank group, the capacitor banks are progressively offset towards the side where the second capacitor bank group is located, from the innermost to the outermost layer. That is, in the first capacitor bank group, the end of each capacitor bank away from the second capacitor bank group is progressively offset towards the side where the second capacitor bank group is located, from the innermost to the outermost layer, and the end of each capacitor bank near the second capacitor bank group is progressively offset towards the side where the second capacitor bank group is located, from the innermost to the outermost layer, in a stepped manner. The first capacitor bank group includes a second intermediate capacitor bank located between its innermost and outermost capacitor banks. At least one second intermediate capacitor bank includes multiple second branch circuit breakers arranged side-by-side and spaced apart along the axial direction of the phase-to-phase arrester. The second capacitor bank is radially distanced from the axis of the phase-to-phase arrester, meaning each second capacitor bank is a ring-shaped capacitor bank with the same center and radius. The capacitor banks of the second capacitor bank group and the first capacitor bank group are symmetrical. In the second capacitor bank group, the innermost capacitor bank is offset towards the side of the first capacitor bank group in a stepped manner from the outermost capacitor bank. The first valve plate 21 of the phase-to-phase arrester forms the first valve plate group. The innermost capacitor banks of the first and second capacitor bank groups are electrically connected to the two ends of the first valve plate group. All the capacitor banks of the phase-to-phase arrester support tube 20 form capacitors C2, C3, and C4. Capacitors C2 and C3 are connected in series and then in parallel with the first valve plate group to bear high voltage. The node between capacitors C2 and C3 is electrically connected to the ground phase through capacitor C4. Preferably, a third conductor 200 is led out from the node between capacitors C2 and C3. Capacitor C4 serves as a voltage dividing capacitor for monitoring, playing a role in voltage division and monitoring. Of course, as in other embodiments, the first capacitive screen group and the second capacitive screen group may not have a second intermediate capacitive screen composed of multiple second sub-capacitive screens.

[0045] like Figure 3 As shown, in the third capacitor bank group, the ends of each capacitor bank taper in a stepped manner towards the axial center of the phase-to-phase arrester from the innermost to the outermost capacitor bank. Furthermore, the ends of the innermost capacitor bank of the third capacitor bank group are located between the ends of the outermost capacitor banks of the first and second capacitor bank groups along the axial direction of the phase-to-phase arrester.

[0046] like Figure 1 As shown, the phase-to-phase surge arrester also includes a third conductive block 22. Two third conductive blocks 22 are respectively disposed at both ends of the phase-to-phase surge arrester support tube 20 to press against the first valve plate 21 of the phase-to-phase surge arrester.

[0047] like Figure 1As shown, the base includes a housing 3 and an insulating medium 4 filled within the housing 3. The insulating medium 4 fills each bushing, each phase-to-phase arrester, and the gap between the bushings and the phase-to-phase arresters. The housing 3 is electrically connected to ground. Furthermore, the housing 3 also includes a housing hole 30 for injecting the insulating medium 4 into it. The base adopts a structure of housing 3 + insulating medium 4, which facilitates the maintenance and replacement of the phase-to-phase arresters inside the base, and the insulation performance of the base can be maintained by replacing the insulating medium 4.

[0048] It should be noted that in the description of this invention, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship conventionally placed during use. They are used only for ease of description and do not indicate that the device or element referred to must have a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating relative importance.

[0049] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A bushing-type intelligent overvoltage protector, characterized in that: The overvoltage protector includes a base, three sets of surge arrester bushing assemblies, and three sets of phase-to-phase surge arresters installed in the base. The surge arrester bushing assembly includes a bushing and a phase-to-ground surge arrester. One end of the bushing is inserted into the base, and the other end is located outside the base. The phase-to-ground surge arrester is located outside the base and sleeved on the outside of the bushing. The bushing includes a conductor (100) and a bushing insulating core (101) wrapped around the conductor (100). The bushing insulating core (101) includes multiple capacitor screens alternately arranged with the insulation layer. The innermost and outermost capacitor screens are respectively connected to the high-voltage power supply and the ground phase power. A first conductor (1010) is led out from the capacitor screen between the innermost and outermost layers. The phase-to-ground surge arrester includes a phase-to-ground surge arrester support tube (114) and a phase-to-ground surge arrester support tube (114). The surge arrester support tube (114) contains multiple stacked annular second valve plates (115), each second valve plate (115) being sleeved on the outside of the sleeve. The phase-to-ground surge arrester support tube (114) includes multiple capacitor screens alternating with the insulation layer. The innermost capacitor screen is electrically connected to the high-voltage power supply, and the outermost capacitor screen is electrically connected to the ground phase. A second conductor (1140) is led out from the capacitor screen between the innermost and outermost layers. One end of each of the three sets of conductors (100) is used to connect to the three phases of the high-voltage power supply, and the other end of each is electrically connected to the ground phase through a set of phase-to-ground surge arresters. A set of phase-to-phase surge arresters is connected in series between any two sets of conductors (100). The phase-to-phase surge arrester includes a phase-to-phase surge arrester support tube (20) and multiple stacked first valve plates (21) disposed inside the phase-to-phase surge arrester support tube (20). The phase-to-phase surge arrester support tube (20) includes multiple capacitor screens that are alternately disposed with the insulation layer. The innermost and outermost capacitor screens are respectively connected to the high-voltage power supply and the ground phase power. A third conductor (200) is led out from the capacitor screen between the innermost and outermost layers.

2. The bushing-type intelligent overvoltage protector according to claim 1, characterized in that: The capacitor screen of the phase-to-ground surge arrester support tube (114) forms two capacitors connected in series between the high-voltage power supply and the ground phase. The two capacitors are connected in parallel with the second valve plate group formed by the second valve plate (115). The two capacitors are capacitor C0 and capacitor C1, respectively.

3. The bushing-type intelligent overvoltage protector according to claim 1 or 2, characterized in that: In the phase-to-ground surge arrester support tube (114), from the innermost capacitor screen to the outermost capacitor screen, each one shifts in a stepped manner toward the side where the base is located.

4. The bushing-type intelligent overvoltage protector according to claim 3, characterized in that: The phase-to-ground surge arrester support tube (114) also includes a first intermediate capacitor screen located between its outermost and innermost capacitor screens. At least one first intermediate capacitor screen includes multiple first sub-capacitor screens arranged side by side and spaced apart along the axial direction of the phase-to-ground surge arrester. Each first sub-capacitor screen is radially distanced from the conductor (100) of the corresponding bushing.

5. The bushing-type intelligent overvoltage protector according to claim 1, characterized in that: The capacitor screen of the phase-to-phase arrester support tube (20) forms capacitors C2, C3 and C4. After C2 and C3 are connected in series, they are connected in parallel with the first valve plate group formed by the first valve plate (21) of the phase-to-phase arrester. The node between C2 and C3 is connected to the ground phase through capacitor C4.

6. The bushing-type intelligent overvoltage protector according to claim 1 or 5, characterized in that: The phase-to-phase arrester support tube (20) includes a first capacitor bank group, a second capacitor bank group and a third capacitor bank group. The first capacitor bank group and the second capacitor bank group are arranged side by side along the axial direction of the phase-to-phase arrester, and the third capacitor bank group is wrapped around the first capacitor bank group and the second capacitor bank group. In the first capacitor screen group, from the innermost capacitor screen to the outermost capacitor screen, they are offset one by one in a step-like manner toward the side where the second capacitor screen group is located. The capacitor screens of the second capacitor screen group and the first capacitor screen group are symmetrical to each other. The innermost capacitor screens of the first capacitor screen group and the second capacitor screen group are electrically connected to the axial ends of the first valve plate group formed by the first valve plate (21) of the phase-to-phase arrester.

7. The bushing-type intelligent overvoltage protector according to claim 6, characterized in that: In the third capacitor bank group, each capacitor bank has its ends tapering in a stepped manner from the innermost capacitor bank to the outermost capacitor bank towards the axial center of the phase-to-phase arrester; and / or, the first capacitor bank group includes a second intermediate capacitor bank located between its innermost and outermost capacitor banks, and at least one second intermediate capacitor bank includes multiple second sub-capacitor banks arranged side-by-side and spaced apart along the axial direction of the phase-to-phase arrester, with each second sub-capacitor bank having the same radial distance from the axis of the phase-to-phase arrester.

8. The bushing-type intelligent overvoltage protector according to claim 1, characterized in that: The bushing also includes a bushing support tube, which includes an upper support tube (102) and a lower support tube (103) used in conjunction. The bushing insulating core (101) includes an upper part of the core protruding outside the base and a lower part of the core inserted inside the base. The upper support tube (102) is sleeved outside the upper part of the core and located between the upper part of the core and the second valve plate (115) of the phase-to-ground surge arrester. The lower support tube (103) is sleeved outside the lower part of the core and located inside the base.

9. The bushing-type intelligent overvoltage protector according to claim 8, characterized in that: The phase-to-ground surge arrester also includes a lower equipotential bonding ball (104), an upper equipotential bonding ball (110), a second conductive block (111), a spring (112), a skirt (113), an upper flange (116), and a lower flange (117). The upper equipotential bonding ball (110) is located at the upper end of the phase-to-ground surge arrester and has an opening for the conductor (100) of the bushing to pass through. The upper end of the phase-to-ground surge arrester support tube (114) is inserted into the upper equipotential bonding ball (110). The second conductive block (111) is an annular conductive block located inside the upper equipotential bonding ball (110) and sleeved on the upper end of the bushing. The spring (112) is located inside the phase-to-ground surge arrester support tube (114) and is positioned... Between the second conductive block (111) and the second valve plate (115) of the phase-to-ground surge arrester, the upper flange (116) is connected to the lower end of the phase-to-ground surge arrester support tube (114) and the upper half support tube (102) respectively. The lower flange (117) is connected to the base and the upper flange (116). The umbrella skirt (113) is sleeved outside the phase-to-ground surge arrester support tube (114) and located between the upper equalizing ball (110) and the upper flange (116). The lower equalizing ball (104) is set at the lower end of the bushing and inserted into the lower end of the lower half support tube (103). The lower equalizing ball (104) has a lower equalizing ball opening for the conductor (100) of the bushing to pass through.

10. The bushing-type intelligent overvoltage protector according to claim 1, characterized in that: The phase-to-phase arrester also includes a third conductive block (22), and two third conductive blocks (22) are respectively installed at both ends of the phase-to-phase arrester support tube (20) to press the first valve plate (21) of the phase-to-phase arrester.

11. The bushing-type intelligent overvoltage protector according to claim 1, characterized in that: The three sets of bushings are A-phase bushing (2a), B-phase bushing (2b), and C-phase bushing (2c), arranged side-by-side at intervals along the radial direction of each bushing; the three sets of inter-phase surge arresters are the first inter-phase surge arrester (ab), the second inter-phase surge arrester (bc), and the third inter-phase surge arrester (ac), with the axial direction of the inter-phase surge arrester perpendicular to the axial direction of the bushing. The two ends of the first inter-phase surge arrester (ab) are close to the A-phase bushing (2a) and the B-phase bushing, respectively. (2b) The lower end is set with the two ends of the second phase-to-phase arrester (bc) close to the lower ends of the B-phase bushing (2b) and the C-phase bushing (2c) respectively. The first phase-to-phase arrester (ab) and the second phase-to-phase arrester (bc) are coaxial. The three sets of bushings are located on the upper side of the axis of the first phase-to-phase arrester (ab) and the second phase-to-phase arrester (bc). The third phase-to-phase arrester (ac) is located on the lower side of the axis of the first phase-to-phase arrester (ab) and the second phase-to-phase arrester (bc).

12. The bushing-type intelligent overvoltage protector according to claim 11, characterized in that: The overvoltage protector also includes a first conductive element (50), a second conductive element (51), and a third conductive element (6). Three sets of interphase arresters are located between the first conductive element (50) and the second conductive element (51). The lower end of the conductor (100) of the A-phase bushing (2a) and the end of the first interphase arrester (ab) near the A-phase bushing (2a) are electrically connected to one end of the first conductive element (50), and the other end of the first conductive element (50) is electrically connected to one end of the third interphase arrester (ac). The lower end of the conductor (100) of the phase bushing (2b) is electrically connected to the first phase-to-phase arrester (ab) and the second phase-to-phase arrester (bc) near the lower end of the phase-B bushing (2b) via the third conductive element (6). The lower end of the conductor (100) of the phase-C bushing (2c) and the lower end of the second phase-to-phase arrester (bc) near the lower end of the phase-C bushing (2c) are electrically connected to one end of the second conductive element (51). The other end of the third phase-to-phase arrester (ac) is electrically connected to the other end of the second conductive element (51).

13. The bushing-type intelligent overvoltage protector according to claim 1, characterized in that: The base includes a housing (3) and an insulating medium (4) filled inside the housing (3), and the housing (3) is electrically connected to the ground.

14. The bushing-type intelligent overvoltage protector according to claim 13, characterized in that: The housing (3) also includes a housing hole (30) for injecting an insulating medium (4) therein.

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