Closed combination casing

Abstract

A closed combined bushing comprises a second bushing with a high-voltage switch inside, an actuator, a cable terminal, and a connector arranged between the second bushing, the actuator and the cable terminal, the connector being connected to the cable terminal and the second bushing respectively, and being connected to the actuator through a third bushing; the second bushing with the high-voltage switch is connected to a transformer, one end of the high-voltage switch is used for electrical connection with the transformer, and the other end is connected to a metal guide rod extending into the connector, an insulating pull rod of the actuator passes through the third bushing and is connected to the metal guide rod for driving the high-voltage switch to operate, and by integrating the high-voltage switch, the cable terminal and the actuator, it not only has the bushing function but also has the switch control and cable terminal functions, and has a compact structure, low cost and easy installation.

Description

Technical Field

[0001] The invention relates to the field of high-voltage electrical appliances, in particular to a closed combined bushing. Background Art

[0002] High-voltage bushings are mainly used for ground insulation of incoming and outgoing lines of power equipment such as transformers, reactors, circuit breakers, and high-voltage circuits passing through walls. Existing high-voltage bushings have single functions and are difficult to meet market needs. Some high-voltage bushings with control functions have too complex structures, which are not only difficult to install, but also have poor reliability. Summary of the invention

[0003] The purpose of the invention is to overcome the defects of the prior art and provide a closed combined sleeve with simple structure and high reliability.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A closed combined bushing comprises a second bushing 200 with a high-voltage switch 2 inside, an actuator 3, a cable terminal 4, and a connector 1 arranged between the second bushing 200, the actuator 3 and the cable terminal 4, wherein the connector 1 is connected to the cable terminal 4 and the second bushing 200 respectively, and is connected to the actuator 3 through a third bushing 300; the second bushing 200 with the high-voltage switch 2 is connected to a transformer 5, one end of the high-voltage switch 2 is used for electrical connection with the transformer 5, and the other end is connected to a metal guide rod 20 extending into the connector 1, and an insulating pull rod 6 of the actuator 3 passes through the third bushing 300 and is connected to the metal guide rod 20 for driving the high-voltage switch 2 to operate.

[0006] Optionally, the second bushing 200 provided with the high-voltage switch 2 is connected to the transformer 5 via a connecting bushing 8 .

[0007] Optionally, the second sleeve includes a vacuum circuit breaker 210 and a second insulating core wrapped outside the vacuum circuit breaker 210, and the second insulating core is provided with a plurality of second capacitor screens 201 alternately arranged with the insulating layer, wherein the outermost second capacitor screen 201 is a grounding screen.

[0008] Optionally, two second capacitor screen groups are embedded in the second insulating core of the second sleeve 200, each second capacitor screen group is composed of a plurality of second capacitor screens 201 alternately arranged with the insulating layer, and the two second capacitor screen groups are respectively arranged at both ends of the second insulating core, and the outermost second capacitor screens 201 of the two second capacitor screen groups are grounded screens and are connected.

[0009] Optionally, the second capacitive screens 201 of each second capacitive screen group are coaxially arranged, and the diameter and length of the second capacitive screens 201 gradually increase from the inside to the outside.

[0010] Optionally, the screen end step distances c at both ends of two adjacent second capacitive screens 201 are equal.

[0011] Optionally, a plurality of first voltage-dividing capacitor screens 230 alternately arranged with the insulating layer are provided on the outside of a group of second capacitor screen groups near one end of the transformer 5, a group of second capacitor screen groups near one end of the transformer 5 constitutes a second main capacitor, a plurality of first voltage-dividing capacitor screens 230 are connected in parallel to constitute a second voltage-dividing capacitor, and the second main capacitor and the second voltage-dividing capacitor constitute a capacitive voltage divider.

[0012] Optionally, a flange assembly 221 is provided on the outer side of the second bushing 200 , and two ends of the flange assembly 221 are respectively connected to the second bushing 200 and the transformer 5 through metal flanges 9 and sealed.

[0013] Optionally, a hollow coil 220 sleeved on the outside of the second sleeve 200 is provided between the flange assembly 221 and the second sleeve 200 .

[0014] Optionally, the connecting bushing 8 includes a first bushing 100, and a second bushing 200 provided with a high-voltage switch 2 is connected to the transformer 5 through the first bushing 100; or, the second bushing 200 provided with a high-voltage switch 2 is connected to the transformer 5 through the first bushing 100 and the docking bushing 110 in sequence.

[0015] Optionally, the connecting sleeve 8 is connected to the transformer 5 via a butt sleeve 110 , and the butt sleeve 110 is in a cylindrical truncated cone shape and is made of silicone rubber.

[0016] Optionally, the first sleeve 100 includes a guide rod 212 and a first insulating core wrapped around the guide rod 212, wherein the first insulating core is provided with a plurality of first main capacitor screens 101 alternately arranged with the insulating layer, wherein the diameters of the plurality of first main capacitor screens 101 gradually increase from the inside to the outside, and the lengths gradually decrease from the inside to the outside, forming a stepped retreat.

[0017] Optionally, within the first insulating core, a plurality of first voltage-dividing capacitor screens 230 are provided alternately with the insulating layer on the outside of the plurality of first main capacitor screens 101. The plurality of first main capacitor screens 101 are connected in series to form a first main capacitor. The plurality of first voltage-dividing capacitor screens 230 are connected in parallel to form a first voltage-dividing capacitor with larger capacitance. The first main capacitor and the first voltage-dividing capacitor form a capacitive voltage divider.

[0018] Optionally, within the first insulating core, multiple first shielding capacitor screens are provided outside the multiple first main capacitor screens 101 and the multiple first voltage-dividing capacitor screens 230. The multiple first shielding capacitor screens are staggered from one end to the other along the axial direction of the first insulating core and are insulated from each other and overlapped with each other.

[0019] Optionally, a hollow coil 220 or an iron core coil is sleeved on the outer side of the middle part of the first insulating core.

[0020] Optionally, a guide rod 212 is provided in the first bushing 100 , one end of the guide rod 212 is plug-fitted with the vacuum circuit breaker 210 , and the other end of the guide rod 212 is connected to the transformer 5 .

[0021] Optionally, the connector 1 is T-shaped, and the second sleeve 200 and the third sleeve 300 are relatively arranged at the two ends of the connector 1. A pull rod channel 11 is provided in the connector 1, and the two ends of the pull rod channel 11 are respectively connected to the second sleeve 200 and the third sleeve 300. The cable terminal 4 is vertically arranged on one side of the connector 1 and connected to the other end of the connector 1. A lead channel 12 for avoiding the lead-out wire 7 is provided on one side of the pull rod channel 11. One end of the lead channel 12 is connected to the pull rod channel 11, and the other end is connected to the cable terminal 4.

[0022] Optionally, the third sleeve 300 includes a third insulating core provided with a plurality of third capacitive screens 301 , and the insulating pull rod 6 of the actuator 3 passes through a cavity of the third insulating core and extends into the connector 1 .

[0023] Optionally, the third insulating core is provided with a plurality of third capacitor screens 301 alternately arranged with the insulating layer, wherein the outermost third capacitor screen 301 is a grounding screen, the innermost third capacitor screen 301 is a high-voltage screen, and the diameter and length of the third capacitor screen 301 gradually increase from the inside to the outside.

[0024] Optionally, the screen end gradient distance between two adjacent third capacitive screens 301 at one end close to the connector 1 is a, and the screen end gradient distance between two adjacent third capacitive screens 301 at one end close to the actuator 3 is b, a <b。

[0025] Optionally, a lightning arrester is provided in the cavity of the third insulating core, and the lightning arrester includes a plurality of annular zinc oxide valve plates 310 stacked in layers, and the insulating pull rod 6 passes through the middle of the zinc oxide valve plates 310 and is connected to the actuator 3 .

[0026] Optionally, a positive capacitor screen group and a reverse capacitor screen group are alternately arranged and connected in parallel, wherein the innermost and outermost sides are both positive capacitor screen groups; the positive capacitor screen group includes a plurality of third capacitor screens 301 alternately arranged with the insulating layer, the innermost third capacitor screen 301 of the positive capacitor screen group is connected to a high potential, and the outermost third capacitor screen 301 is connected to a low potential; the reverse capacitor screen group includes a plurality of third capacitor screens 301 alternately arranged with the insulating layer, the innermost third capacitor screen 301 of the reverse capacitor screen group is connected to a low potential, and the outermost third capacitor screen 301 is connected to a high potential.

[0027] Optionally, the connector 1 and the third sleeve 300 , the second sleeve 200 and the cable terminal 4 are all connected and sealed via a metal flange 9 , and the third sleeve 300 and the actuator 3 can also be connected and sealed via a metal flange 9 .

[0028] Optionally, an elastic insulating medium 14 is respectively provided in the middle of the second sleeve 200 and the third sleeve 300, and an insertion portion 13 extending to the middle of the second sleeve 200 and the third sleeve 300 and inserted into the elastic insulating medium 14 is respectively provided at both ends of the connector 1; the other end of the connector 1 connected to the cable terminal 4 is provided with an insertion portion 13, and an insertion groove 15 cooperating with the insertion portion 13 is provided at the end of the cable terminal 4.

[0029] Optionally, one end of the first bushing 100 extends into the second bushing 200, and the other end extends into the transformer 5. A flange assembly 221 is provided on the outer side of the middle part of the first bushing 100. The second bushing 200 is fixedly connected to the transformer 5 through the flange assembly 221. A hollow coil 220 is provided between the flange assembly 221 and the first bushing 100 and is sleeved on the outer side of the first bushing 100.

[0030] The closed combined bushing created by the present invention integrates a high-voltage switch, a cable terminal and an actuator, and has not only bushing functions but also switch control and cable terminal functions, and has a compact structure, low cost and easy installation.

[0031] In addition, the second bushing 200 provided with the high-voltage switch 2 is connected to the transformer 5 through the connecting bushing 8, which has the characteristics of convenient modularization and convenient connection. The connecting bushing 8 can be suitable for convenient installation and matching with transformers 5 of different models and specifications. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is the first embodiment of the closed combined casing created by the present invention;

[0033] Figure 2 This is the second embodiment of the closed combined casing created by the present invention;

[0034] Figure 3 This is the third embodiment of the closed combined casing created by the present invention;

[0035] Figure 4 This invention is Figure 1 A magnified view of part A;

[0036] Figure 5 This invention is Figure 1 A magnified view of part B;

[0037] Figure 6 This invention is Figure 3 Magnified view of part C. DETAILED DESCRIPTION

[0038] The following is combined with Figures 1 to 6 The following examples are provided to further illustrate the specific implementation of the closed type combined sleeve created by the present invention. The closed type combined sleeve created by the present invention is not limited to the description of the following examples.

[0039] like Figure 1-3 As shown, the closed combined bushing created by the present invention is used to connect with the transformer 5, which includes a second bushing 200 with a high-voltage switch 2 inside, an actuator 3, a cable terminal 4, and a connector 1 arranged between the second bushing 200, the actuator 3 and the cable terminal 4, the connector 1 is connected to the cable terminal 4 and the second bushing 200 respectively, and is connected to the actuator 3 through the third bushing 300; the second bushing 200 with the high-voltage switch 2 is connected to the transformer 5, one end of the high-voltage switch 2 is used to be electrically connected to the transformer 5, and the other end is connected to the metal guide rod 20 extending into the connector 1, the lead-out wire connected to the metal guide rod 20 is led out through the cable terminal 4, and the insulating pull rod 6 of the actuator 3 passes through the third bushing 300 and is connected to the metal guide rod 20 to drive the high-voltage switch 2 to operate.

[0040] The enclosed combined bushing created by the present invention integrates a high-voltage switch, a cable terminal and an actuator, and has not only bushing functions but also switch control and cable terminal functions, and has a compact structure, low cost and convenient installation. Further preferably, the second bushing 200 provided with the high-voltage switch 2 is connected to the transformer 5 through the connecting bushing 8, which has the characteristics of convenient modularization and convenient connection, and the connecting bushing 8 can be suitable for convenient installation and matching with transformers 5 of different models and specifications.

[0041] Embodiment 1

[0042] like Figure 1 As shown, the closed combined bushing of the present invention includes a second bushing 200 with a high-voltage switch 2 inside, one end of the second bushing 200 is connected to the transformer 5 through a connecting bushing 8, and the other end is connected to one end of a connector 1, the connector 1 is an insulating tee, the other end of the connector 1 is connected to the actuator 3 through a third bushing 300, and one end of the side of the connector 1 is connected to the cable terminal 4.

[0043] The high-voltage switch 2 of this embodiment is a vacuum circuit breaker 210, the connecting sleeve 8 is composed of a first sleeve 100, the second sleeve 200 is connected to the transformer 5 through the first sleeve 100, one end of the first sleeve 100 extends into the second sleeve 200, and the other end extends into the transformer 5 to cooperate with the transformer 5, a guide rod 212 is provided in the first sleeve 100, one end of the guide rod 212 is used to be electrically connected to the transformer 5, and the other end of the guide rod 212 is electrically connected to the static contact of the vacuum circuit breaker 210. The moving contact of the vacuum circuit breaker 210 is connected to the metal guide rod 20, the metal guide rod 20 extends into the connector 1, the lead wire is connected to the metal guide rod 20 and is led out from the cable terminal 4, and the insulating pull rod 6 of the actuator 3 passes through the third sleeve 300 and is connected to the metal guide rod 20.

[0044] Further, the connector 1 and the third bushing 300, the second bushing 200 and the cable terminal 4 are all connected and sealed by the metal flange 9, and the third bushing 300 and the actuator 3 can also be connected and sealed by the metal flange 9. The second bushing 200 and the first bushing 100, as well as the first bushing 100 and the transformer 5 can be connected and sealed by the metal flange 9. Preferably, the middle of the second bushing 200 and the third bushing 300 are respectively provided with an elastic insulating medium 14, and the two ends of the connector 1 are respectively provided with an insertion portion 13 extending to the middle side of the second bushing 200 and the third bushing 300 and inserted into the elastic insulating medium 14. The elastic insulating medium 14 is preferably silicone rubber with a certain elasticity. Of course, other elastic insulating media can also be used. Further, the other end of the connector 1 connected to the cable terminal 4 is also provided with a raised insertion portion 13, and the end of the cable terminal 4 is provided with an insertion groove 15 that cooperates with the insertion portion 13. The connector 1 is inserted into the middle side of the second sleeve 200, the third sleeve 300 and the cable terminal 4 through the insertion portion 13, which can improve the sealing of the connection, and insulating glue can be applied at the connection. Of course, the insertion portion 13 can also be set at only one end or both ends of the connector 1, and the other ends are not set with the insertion portion 13, which belongs to the protection scope of the invention.

[0045] like Figure 1 , 5As shown, the first sleeve 100 of this embodiment includes a guide rod 212 and a first insulating core wrapped outside the guide rod 212, and a plurality of first main capacitor screens 101 alternately arranged with the insulating layer are arranged in the first insulating core, and the diameter of the plurality of first main capacitor screens 101 gradually increases from the inside to the outside, and the length gradually decreases from the inside to the outside, forming a step-shaped retreat. Further, in the first insulating core, a plurality of first voltage-dividing capacitor screens 230 alternately arranged with the insulating layer are arranged outside the plurality of first main capacitor screens 101, and a plurality of first main capacitor screens 101 are connected in series to form a first main capacitor, and a plurality of first voltage-dividing capacitor screens 230 are connected in parallel to form a first voltage-dividing capacitor with a larger capacitance, and the first main capacitor and the first voltage-dividing capacitor are connected in series to form a capacitor divider, which can realize the function of an electronic voltage transformer, and the lead-out line between the first main capacitor and the first voltage-dividing capacitor can be connected to a voltage measuring device and / or an insulation monitor and / or a partial discharge detector to monitor the voltage, waveform and partial discharge of the substation. In addition, instead of winding the first voltage-dividing capacitor separately, a tap may be connected from the second to last first main capacitor screen 101 outside the first main capacitor to form a capacitive voltage divider.

[0046] Furthermore, within the first insulating core, multiple first shielding capacitor screens are provided outside the multiple first main capacitor screens 101 and the multiple first voltage-dividing capacitor screens 230. The multiple first shielding capacitor screens are staggered from one end to the other end along the axial direction of the first insulating core and are insulated from each other and overlapped with each other. The multiple first shielding capacitor screens are connected in series to form a shielding capacitor, which is arranged outside the capacitor divider formed by the first main capacitor and the first voltage-dividing capacitor to shield interference from external signals.

[0047] Further, a plurality of shielding voltage-dividing capacitor screens are arranged alternately with the insulating layer outside the shielding capacitor in the first insulating core, and a plurality of shielding voltage-dividing capacitor screens are connected in parallel to form a shielding voltage-dividing capacitor, and the shielding capacitor and the shielding voltage-dividing capacitor are connected in series to form a second capacitor voltage divider, and the lead wire between the shielding capacitor and the shielding voltage-dividing capacitor can be used for measurement. The current signal and the voltage signal collected by the capacitor voltage divider and the second capacitor voltage divider are both from the inside of the first sleeve 100, with good consistency, no need to add additional current transformers, no need to obtain voltage signals from voltage transformers, and the output current signals and voltage signals are more accurate, will not be affected by the external environment (or less affected by the external environment), and monitoring is more accurate. In addition, the two signals obtained based on the capacitor voltage divider and the second capacitor voltage divider can be used for the detection of partial discharge sources.

[0048] Furthermore, an air-core coil 220 or an iron-core coil is sleeved outside the middle of the first insulating core to realize the function of an electronic current transformer. A flange assembly 221 is sleeved outside the first insulating core and the air-core coil 220 for connecting with the second bushing 200 and the transformer 5.

[0049] One end of the first bushing 100 extends into the second bushing 200, and the other end extends into the transformer 5. A flange assembly 221 is provided on the outside of the middle of the first bushing 100. The second bushing 200 is fixedly connected to the transformer 5 through the flange assembly 221. An air-core coil 220 sleeved on the outside of the first bushing 100 is provided between the flange assembly 221 and the first bushing 100. The middle of the first insulating core is cylindrical, and the two ends are conical. The cone at one end extends into the second bushing 200, and the other end extends into the transformer 5. One end of the guide rod 212 in the first insulating core is electrically connected to the static contact of the vacuum circuit breaker 210, and the other end is used to be electrically connected to the transformer 5. A hollow coil 220 is provided outside the first insulating core, and a flange assembly 221 is provided outside the first insulating core and the hollow coil 220. The flange assembly 221 seals and protects the hollow coil 220 or the iron core coil, and an upper flange at one end of the flange assembly 221 is fixedly connected to and sealed with a flange of the second bushing 200, and a lower flange at the other end is fixedly connected to and sealed with the transformer 5. Preferably, a first sealing ring 214 is provided between the two ends of the flange assembly 221 and the outer wall of the first bushing 100.

[0050] The second sleeve 200 of this embodiment includes a vacuum circuit breaker 210 and a second insulating core wrapped outside the vacuum circuit breaker 210. Preferably, a plurality of second capacitor screens 201 alternately arranged with the insulating layer are arranged in the second insulating core, wherein the outermost second capacitor screen 201 is a grounding screen. In particular, in the preferred embodiment of this embodiment, two second capacitor screen groups are embedded in the second insulating core of the second sleeve 200, each second capacitor screen group is composed of a plurality of second capacitor screens 201 alternately arranged with the insulating layer, and the two second capacitor screen groups are respectively arranged at both ends of the second insulating core, and the outermost second capacitor screens 201 of the two second capacitor screen groups are grounding screens and connected. The second capacitor screen 201 of each second capacitor screen group is coaxially arranged and the diameter and length of the second capacitor screen 201 gradually increase from the inside to the outside. Preferably, the screen end gradient distance c at both ends of two adjacent second capacitor screens 201 is equal, and of course it can also be unequal. In this embodiment, an insulating medium 14 is filled between the second insulating core and the vacuum circuit breaker 210, and both ends of the vacuum circuit breaker 210 in the second insulating core are also filled with insulating medium 14, and a truncated cone-shaped insertion groove is formed. The elastic insulating medium 14 is preferably silicone rubber, which has a certain elasticity. Of course, other elastic insulating media can also be used.

[0051] Furthermore, a sealing cylinder 213 cooperating with the guide rod 212 is provided at one end of the vacuum circuit breaker 210. The sealing cylinder 213 is fixedly connected to the vacuum circuit breaker 210 through the second flange assembly 91. The guide rod 212 can extend to the inner side of the sealing cylinder 213 to be connected with the static contact. An extended sealing cylinder 215 extending toward the outside of the first sleeve 100 is provided at the edge of the sealing cylinder 213. Second sealing rings 218 cooperating with the guide rod 212 and the first sleeve 100 are respectively provided on the inner walls of the sealing cylinder 213 and the extended sealing cylinder 215.

[0052] The connector 1 of this embodiment is T-shaped and is an insulating tee. The second sleeve 200 and the third sleeve 300 are relatively arranged at the two ends of the connector 1. One end of the second sleeve 200 and the third sleeve 300 are fixedly connected to the two ends of the connector 1 through the metal flange 9 respectively. A pull rod channel 11 is provided in the connector 1. The two ends of the pull rod channel 11 are respectively connected to the second sleeve 200 and the third sleeve 300, and are used to accommodate the metal guide rod 20 and the insulating pull rod 6; the cable terminal 4 is vertically arranged on one side of the connector 1 and connected to the other end of the connector 1 through the metal flange 9. A lead channel 12 for avoiding the lead-out wire 7 is provided on one side of the pull rod channel 11. The lead channel 12 is vertically arranged to the pull rod channel 11, one end of the lead channel 12 is connected to the pull rod channel 11, and the other end is connected to the cable terminal 4. Furthermore, the two ends of the rod channel 11 are respectively arranged in the middle of the insertion part 13, so that the two ends of the insulating rod 6 pass through the middle of the insertion part 13, and the end of the lead-in channel 12 is also arranged in the middle of the insertion part 13, so that one end of the lead-out wire 7 passes through the middle of the insertion part 13, and a wire channel 16 for accommodating the lead-out wire 7 is provided in the cable terminal 4, and the wire channel 16 is connected to the insertion groove 15. The insertion part 13 is preferably one and truncated cone-shaped. Of course, multiple insertion parts 13 can also be provided, all of which belong to the protection scope of the invention.

[0053] The third sleeve 300 of the present embodiment includes a third insulating core body with a plurality of third capacitor screens 301 arranged therein, and the insulating pull rod 6 of the actuator 3 extends into the connector 1 through the cavity of the third insulating core body; the third insulating core body is provided with a plurality of third capacitor screens 301 arranged alternately with the insulating layer, wherein the outermost third capacitor screen 301 is a grounding screen, and the innermost third capacitor screen 301 is a high-voltage screen. Preferably, the plurality of third capacitor screens 301 are coaxially arranged, and the diameter and length of the third capacitor screen 301 gradually increase from the inside to the outside. As a preferred solution, the screen end gradient distance between two adjacent third capacitor screens 301 at one end close to the connector 1 is a, and the screen end gradient distance between two adjacent third capacitor screens 301 at one end close to the actuator 3 is b, a <b( Figure 4 ) to optimize the potential distribution. Preferably, the screen end step difference distance b is equal to twice the screen end step difference distance a, that is, b=2a.

[0054] Furthermore, a lightning arrester is provided in the cavity of the third insulating core, and the lightning arrester includes a plurality of annular zinc oxide valve plates 310 stacked in layers, and the insulating pull rod 6 passes through the middle of the zinc oxide valve plates 310 and is connected to the actuator 3 .

[0055] Furthermore, the multiple third capacitor screens 301 in the third insulating core can constitute a large-capacitance capacitor, and the actuator is directly powered by the power supply. Specifically, the third insulating core is provided with a positive capacitor screen group and a reverse capacitor screen group that are alternately arranged and connected in parallel, wherein the innermost and outermost sides are both positive capacitor screen groups; the positive capacitor screen group includes multiple third capacitor screens 301 alternately arranged with the insulating layer, the innermost third capacitor screen 301 of the positive capacitor screen group is connected to a high potential, and the outermost third capacitor screen 301 is connected to a low potential; the reverse capacitor screen group includes multiple third capacitor screens 301 alternately arranged with the insulating layer, the innermost third capacitor screen 301 of the reverse capacitor screen group is connected to a low potential, and the outermost third capacitor screen 301 is connected to a high potential. The capacitance of the insulating core is increased by multiple capacitor screen groups consisting of a forward capacitor screen group and a reverse capacitor screen group that are alternately arranged and connected in parallel, which can double the capacitance and can simultaneously meet the requirements of high-voltage electrical appliances for voltage balancing and large capacitance.

[0056] The actuator is an electromagnetic actuator, or a mechanical actuator, or other types of actuators, which drives the moving contact of the high-voltage switch 2 to move through the insulating pull rod 6 to achieve the connection and disconnection of the line.

[0057] Embodiment 2

[0058] like Figure 2 As shown, the basic structure of this embodiment is the same as that of the first embodiment, except that the structure of the connecting sleeve 8 is different. The connecting sleeve 8 of this embodiment is connected to the transformer through the butt sleeve 110, and is suitable for connection with the European and American transformer 5. A guide rod 212 fixedly connected to the vacuum circuit breaker 210 is provided in the first sleeve 100, and the butt sleeve 110 is arranged in one end of the first sleeve 100 close to the transformer 5 and connected to the guide rod 212. The guide rod 212 is connected to the transformer 5 through the butt sleeve 110. A vacuum bubble static contact cooperating with the guide rod 212 is provided on the vacuum circuit breaker 210. The vacuum circuit breaker 210 is connected to the guide rod 212 through the static contact, and the guide rod 212 is connected to the transformer 5 through the butt sleeve 110.

[0059] Further, the first sleeve 100 is basically conical. The first sleeve 100 of this embodiment includes a guide rod 212 and a first insulating core wrapped outside the guide rod 212. A plurality of first main capacitor screens 101 are arranged alternately with the insulating layer in the first insulating core. The diameter of the plurality of first main capacitor screens 101 gradually increases from the inside to the outside, and the length gradually decreases from the inside to the outside, forming a stepped retreat. As in the first embodiment, a plurality of first voltage-dividing capacitor screens 230 may also be arranged in the first insulating core, and a plurality of first shielding capacitor screens and shielding voltage-dividing capacitor screens may further be arranged.

[0060] Furthermore, the butt sleeve 110 is in a cylindrical truncated cone shape and is embedded in one end of the first sleeve 100. The thickness of the tube wall of the first sleeve 100 gradually shrinks inward from the middle to the end close to the vacuum circuit breaker 210, and the thickness of the tube wall of the first sleeve 100 gradually shrinks outward from the middle to the end close to the butt sleeve 110, and the first main capacitor screen 101 is inclined outward at the end close to the butt sleeve 110, and the butt sleeve 110 is arranged between the inclined ends of the first main capacitor screen 101.

[0061] Furthermore, the second bushing 200 is fixedly connected to the transformer 5 through the flange assembly 221, and the two ends of the flange assembly 221 are respectively fixedly connected to the second bushing 200 and the transformer 5 through the metal flange 9 and sealed, one end of the first bushing 100 extends into the second bushing 200, the butt bushing 110 is arranged inside the other end of the first bushing 100, the first bushing 100 is provided with the other end of the butt bushing 110 extending into the flange assembly 221, and an air-core coil 220 is provided between the flange assembly 221 and the first bushing 100 and is sleeved on the outside of the first bushing 100, and the air-core coil 220 can sense the change of the current in the first bushing 100 to realize the function of the electronic current transformer. Preferably, a first sealing ring 214 is provided between the two ends of the flange assembly 221 and the outer wall of the first bushing 100.

[0062] Embodiment 3

[0063] like Figure 3 As shown, the basic structure of this embodiment is the same as that of the previous two embodiments, the difference being that the second bushing 200 is directly fixedly connected to the transformer 5 via the docking bushing 110, a docking contact 216 connected to the vacuum circuit breaker 210 is provided on the docking bushing 110, a static contact cooperating with the docking contact 216 is provided on the vacuum circuit breaker 210, and the vacuum circuit breaker 210 is connected to the transformer 5 via the static contact in contact with the docking contact 216.

[0064] Specifically, a flange assembly 221 is provided on the outside of the second bushing 200, and the two ends of the flange assembly 221 are respectively connected to the second bushing 200 and the transformer 5 through the metal flange 9 and sealed. A hollow coil 220 sleeved on the outside of the second bushing 200 is provided between the flange assembly 221 and the second bushing 200. The hollow coil 220 can sense the change of the current in the first bushing 100 to realize the function of the electronic current transformer. Preferably, a sealing ring 214 is provided between the two ends of the flange assembly 221 and the outer wall of the second bushing 200.

[0065] Furthermore, the butt joint sleeve 110 is in a cylindrical truncated cone shape and is embedded in one end of the first sleeve 100. The butt joint sleeve 110 is made of insulating material, preferably silicone rubber.

[0066] Furthermore, the second sleeve of the present embodiment includes a vacuum circuit breaker 210 and a second insulating core wrapped outside the vacuum circuit breaker 210. Preferably, two second capacitor screen groups are embedded in the second insulating core of the second sleeve 200, each second capacitor screen group is composed of a plurality of second capacitor screens 201 alternately arranged with the insulating layer, and the two second capacitor screen groups are respectively arranged at both ends of the second insulating core, and the outermost second capacitor screens 201 of the two second capacitor screen groups are grounded and connected. The second capacitor screen 201 of each second capacitor screen group is coaxially arranged and the diameter and length of the second capacitor screen 201 gradually increase from the inside to the outside. Preferably, the screen end gradient distance c at both ends of two adjacent second capacitor screens 201 is equal.

[0067] In particular, a plurality of first voltage-dividing capacitor screens 230 alternately arranged with the insulating layer may be provided on the outside of a group of second capacitor screens near one end of the transformer 5, a group of second capacitor screens near one end of the transformer 5 constitutes a second main capacitor, a plurality of first voltage-dividing capacitor screens 230 are connected in parallel to constitute a second voltage-dividing capacitor, the second main capacitor and the second voltage-dividing capacitor constitute a capacitor divider, which can realize the function of an electronic voltage transformer, and the lead wire between the second main capacitor and the second voltage-dividing capacitor can be connected to a voltage measuring device and / or an insulation monitor and / or a partial discharge detector to monitor the substation voltage, waveform and partial discharge.

[0068] Furthermore, a vacuum circuit breaker protective cover 217 is provided on the outside of the vacuum circuit breaker 210, and an elastic insulating medium 14 is provided between the vacuum circuit breaker protective cover 217 and the second insulating core, and the elastic insulating medium 14 is preferably silicone rubber. One end of the vacuum circuit breaker protective cover 217 corresponds to the insertion portion 13 of the connector 1 through the second flange assembly 91, and the other end cooperates with the end of the docking sleeve 110. A rod opening 2171 for avoiding the insulating rod 6 is provided at one end of the vacuum circuit breaker protective cover 217, and the other end is connected to the sealing cylinder 213 through the second flange assembly 91. The sealing cylinder 213 is plug-fitted with the docking contact 216, and a second sealing ring 218 cooperating with the docking contact 216 is provided on the inner wall of the sealing cylinder 213.

[0069] The above content is a further detailed description of the invention in combination with specific preferred implementation methods, and it cannot be determined that the specific implementation of the invention is limited to these descriptions. For ordinary technicians in the technical field to which the invention belongs, several simple deductions or substitutions can be made without departing from the concept of the invention, which should be regarded as falling within the scope of protection of the invention.

Claims

1. A closed combined casing, characterized in that: It comprises a second bushing (200) with a high-voltage switch (2) arranged therein, an actuator (3), a cable terminal (4), and a connector (1) arranged between the second bushing (200), the actuator (3) and the cable terminal (4); the connector (1) is connected to the cable terminal (4) and the second bushing (200) respectively, and is connected to the actuator (3) through a third bushing (300); the second bushing (200) with the high-voltage switch (2) is connected to a transformer (5); one end of the high-voltage switch (2) is used for electrical connection with the transformer (5), and the other end is connected to a metal guide rod (20) extending into the connector (1); an insulating pull rod (6) of the actuator (3) passes through the third bushing (300) and is connected to the metal guide rod (20) for driving the high-voltage switch (2) to operate; The high-voltage switch (2) is a vacuum circuit breaker (210); the second bushing comprises the vacuum circuit breaker (210) and a second insulating core wrapped around the vacuum circuit breaker (210); a plurality of second capacitor screens (201) arranged alternately with the insulating layer are arranged in the second insulating core, wherein the outermost second capacitor screen (201) is a grounding screen; two second capacitor screen groups are embedded in the second insulating core of the second bushing (200); each second capacitor screen group is composed of a plurality of second capacitor screens (201) arranged alternately with the insulating layer; the two second capacitor screen groups are arranged at two ends of the second insulating core, respectively; the outermost second capacitor screens (201) of the two second capacitor screen groups are grounding screens and are connected; the second capacitor screens (201) of each second capacitor screen group are coaxially arranged, and the diameter and length of the second capacitor screens (201) gradually increase from the inside to the outside.

2. The closed combined casing according to claim 1, characterized in that: The second bushing (200) provided with the high-voltage switch (2) is connected to the transformer (5) via a connecting bushing (8).

3. The closed combined casing according to claim 1, characterized in that: The screen end step distance c at both ends of two adjacent second capacitive screens (201) is equal.

4. The closed combined casing according to claim 1, characterized in that: A plurality of first voltage-dividing capacitor screens (230) arranged alternately with the insulating layer are arranged outside a group of second capacitor screens near one end of the transformer (5); a group of second capacitor screens near one end of the transformer (5) constitutes a second main capacitor; a plurality of first voltage-dividing capacitor screens (230) are connected in parallel to constitute a second voltage-dividing capacitor; and the second main capacitor and the second voltage-dividing capacitor constitute a capacitive voltage divider.

5. The closed combined casing according to claim 1, characterized in that: A flange assembly (221) is provided on the outside of the second bushing (200), and two ends of the flange assembly (221) are respectively connected to the second bushing (200) and the transformer (5) through metal flanges (9) and sealed.

6. The closed combined casing according to claim 5, characterized in that: A hollow coil (220) sleeved on the outside of the second sleeve (200) is provided between the flange assembly (221) and the second sleeve (200).

7. The closed combined casing according to claim 2, characterized in that: The connecting bushing (8) comprises a first bushing (100), and a second bushing (200) provided with a high-voltage switch (2) is connected to the transformer (5) via the first bushing (100); or, the second bushing (200) provided with the high-voltage switch (2) is connected to the transformer (5) via the first bushing (100) and the butt bushing (110) in sequence.

8. The closed combined casing according to claim 2, characterized in that: The connecting sleeve (8) is connected to the transformer (5) via a butt sleeve (110); the butt sleeve (110) is in the shape of a cylindrical truncated cone and is made of silicone rubber.

9. The closed combined casing according to claim 7, characterized in that: The first sleeve (100) comprises a guide rod (212) and a first insulating core wrapped around the guide rod (212); a plurality of first main capacitor screens (101) arranged alternately with the insulating layer are arranged in the first insulating core; the diameters of the plurality of first main capacitor screens (101) gradually increase from the inside to the outside, and the lengths gradually decrease from the inside to the outside, forming a stepped retreat.

10. The closed combined casing according to claim 9, characterized in that: In the first insulating core, a plurality of first voltage-dividing capacitor screens (230) arranged alternately with the insulating layer are arranged outside the plurality of first main capacitor screens (101); the plurality of first main capacitor screens (101) are connected in series to form a first main capacitor; the plurality of first voltage-dividing capacitor screens (230) are connected in parallel to form a first voltage-dividing capacitor with a larger capacitance; the first main capacitor and the first voltage-dividing capacitor form a capacitive voltage divider.

11. The closed combined casing according to claim 10, characterized in that: In the first insulating core, a plurality of first shielding capacitor screens are provided outside the plurality of first main capacitor screens (101) and the plurality of first voltage-dividing capacitor screens (230), and the plurality of first shielding capacitor screens are staggered from one end to the other end along the axial direction of the first insulating core and are insulated from each other and overlapped with each other.

12. The closed combined casing according to claim 11, characterized in that: A hollow coil (220) or an iron core coil is sleeved on the outer side of the middle part of the first insulating core.

13. The closed combined casing according to claim 9, characterized in that: The high-voltage switch (2) is a vacuum circuit breaker (210), and a guide rod (212) is provided in the first bushing (100); one end of the guide rod (212) is plugged into the vacuum circuit breaker (210), and the other end is connected to the transformer (5).

14. The closed combined casing according to claim 1, characterized in that: The connector (1) is T-shaped, the second sleeve (200) and the third sleeve (300) are arranged at two ends of the connector (1) opposite to each other, a pull rod channel (11) is provided in the connector (1), and the two ends of the pull rod channel (11) are respectively connected to the second sleeve (200) and the third sleeve (300), the cable terminal (4) is vertically arranged on one side of the connector (1) and connected to the other end of the connector (1), and a lead channel (12) for avoiding the lead-out wire (7) is provided on one side of the pull rod channel (11), one end of the lead channel (12) is connected to the pull rod channel (11), and the other end is connected to the cable terminal (4).

15. The closed combined casing according to claim 1, characterized in that: The third sleeve (300) comprises a third insulating core body provided with a plurality of third capacitor screens (301), and the insulating pull rod (6) of the actuator (3) passes through the cavity of the third insulating core body and extends into the connector (1).

16. The closed combined casing according to claim 15, characterized in that: The third insulating core is provided with a plurality of third capacitor screens (301) arranged alternately with the insulating layers, wherein the outermost third capacitor screen (301) is a grounding screen, the innermost third capacitor screen (301) is a high-voltage screen, and the diameter and length of the third capacitor screen (301) gradually increase from the inner side to the outer side.

17. The closed combined casing according to claim 16, characterized in that: The screen end gradient distance between two adjacent third capacitive screens (301) at one end close to the connector (1) is a, and the screen end gradient distance between two adjacent third capacitive screens (301) at one end close to the actuator (3) is b. <b。 18. The closed combined casing according to claim 15, characterized in that: A lightning arrester is arranged in the cavity of the third insulating core, the lightning arrester comprising a plurality of annular zinc oxide valve plates (310) stacked in layers, and an insulating pull rod (6) passes through the middle of the zinc oxide valve plates (310) and is connected to the actuator (3).

19. The closed combined casing according to claim 15, characterized in that: A positive capacitor screen group and a reverse capacitor screen group are arranged alternately and connected in parallel in the third insulating core, wherein the innermost and outermost portions are both positive capacitor screen groups; the positive capacitor screen group comprises a plurality of third capacitor screens (301) arranged alternately with the insulating layer, the innermost third capacitor screen (301) of the positive capacitor screen group is connected to a high potential, and the outermost third capacitor screen (301) is connected to a low potential; the reverse capacitor screen group comprises a plurality of third capacitor screens (301) arranged alternately with the insulating layer, the innermost third capacitor screen (301) of the reverse capacitor screen group is connected to a low potential, and the outermost third capacitor screen (301) is connected to a high potential.

20. The closed combined casing according to claim 1, characterized in that: The connector (1) is connected to the third sleeve (300), the second sleeve (200) and the cable terminal (4) via a metal flange (9) and is sealed. The third sleeve (300) is also connected to the actuator (3) via a metal flange (9) and is sealed.

21. The closed combined casing according to claim 1, characterized in that: An elastic insulating medium (14) is provided in the middle of the second sleeve (200) and the third sleeve (300), respectively; insertion portions (13) extending to the middle of the second sleeve (200) and the third sleeve (300) and inserted into the elastic insulating medium (14) are provided at both ends of the connector (1); the other end of the connector (1) connected to the cable terminal (4) is provided with an insertion portion (13), and an insertion groove (15) that cooperates with the insertion portion (13) is provided at the end of the cable terminal (4).

22. The closed combined casing according to claim 7, characterized in that: One end of the first bushing (100) extends into the second bushing (200), and the other end extends into the transformer (5); a flange assembly (221) is provided on the outside of the middle of the first bushing (100); the second bushing (200) is fixedly connected to the transformer (5) via the flange assembly (221); and a hollow coil (220) sleeved on the outside of the first bushing (100) is provided between the flange assembly (221) and the first bushing (100).

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