Evacuating and oiling system for extra-high voltage bushing

Abstract

The invention discloses an extra-high voltage bushing evacuation oil injection system which comprises at least two sets of evacuation oil injection modules, each set of evacuation oil injection module is connected with at least two extra-high voltage bushings, the at least two sets of evacuation oil injection modules are connected with the same vacuum module, and the at least two sets of evacuation oil injection modules are connected with the same oil injection module. Therefore, one set of vacuumizing and oiling module can conduct vacuumizing and oiling operation on at least two extra-high-voltage bushings, the vacuumizing and oiling efficiency of the extra-high-voltage bushings is improved, each set of vacuumizing and oiling module comprises at least one pipeline capable of being shared by vacuumizing and oiling, the pipeline structure is simplified, and the vacuumizing and oiling efficiency of the extra-high-voltage bushings is improved. The evacuation and oil injection operations can be carried out cooperatively, and the evacuation and oil injection efficiency of the extra-high voltage bushing is further improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of extra-high voltage bushing, more particularly, to an extra-high voltage bushing evacuation and oil injection system. BACKGROUND

[0002] In an extra-high voltage power transmission system, as a key insulation component of core power equipment such as transformers and gas insulated switchgear, the insulation performance of an extra-high voltage bushing directly determines the long-term operation safety, stability and overall power supply reliability of the power equipment. The vacuum oil injection process is a core link for guaranteeing the insulation performance of the extra-high voltage bushing before delivery - by precisely evacuating the internal air gap of the bushing and injecting standard insulation oil, the internal electric field distortion risk can be effectively eliminated, the voltage withstand strength and anti-corona aging ability of the bushing can be improved, and it can be ensured that the bushing does not occur insulation breakdown or partial discharge failure under long-term operation conditions. Therefore, the efficiency and quality of the vacuum oil injection process have a direct impact on the batch manufacturing scale of the extra-high voltage bushing and the upgrading process of power equipment.

[0003] However, the current evacuation and oil injection process of the extra-high voltage bushing can usually only process a single bushing independently, and the evacuation and oil injection are divided into two independent operation systems, which makes the pipeline structure complex and the evacuation and oil injection process inefficient.

[0004] To sum up, how to improve the efficiency of the evacuation and oil injection of the extra-high voltage bushing is a problem to be solved by the technical personnel in the field at present. SUMMARY

[0005] Therefore, the purpose of the present application is to provide an extra-high voltage bushing evacuation and oil injection system to improve the efficiency of the evacuation and oil injection of the extra-high voltage bushing.

[0006] In order to achieve the above purpose, the present application provides the following technical solutions:

[0007] An extra-high voltage bushing evacuation and oil injection system, comprising: at least two groups of evacuation and oil injection modules, each group of the evacuation and oil injection modules being connected with at least two extra-high voltage bushings; wherein, each group of the evacuation and oil injection modules is connected with a same vacuum module, and each group of the evacuation and oil injection modules is connected with a same oil injection module; each group of the evacuation and oil injection modules comprises at least one pipeline shared by evacuation and oil injection.

[0008] In some embodiments, the evacuation and oil injection module comprises a first evacuation and oil injection module and a second evacuation and oil injection module; wherein, the first evacuation and oil injection module comprises a first pipeline and a second pipeline which are in communication with each other, the first pipeline is connected with the vacuum module and the oil injection module, and the second pipeline is connected with two extra-high voltage bushings; the second evacuation and oil injection module comprises a third pipeline and a fourth pipeline which are in communication with each other, the third pipeline is connected with the vacuum module and the oil injection module, and the fourth pipeline is connected with two extra-high voltage bushings.

[0009] In some embodiments, the vacuum module comprises a vacuum unit connected to a main evacuation pipe, the main evacuation pipe being connected to a first evacuation branch and a second evacuation branch; the first evacuation branch being connected to the first end of the first pipe, the second evacuation branch being connected to the first end of the third pipe; the main evacuation pipe being provided with a main evacuation valve, the first end of the first pipe being provided with a first evacuation valve, the first end of the third pipe being provided with a second evacuation valve.

[0010] In some embodiments, the oil injection module comprises an oil injection device connected to a main oil injection pipe, the main oil injection pipe being connected to an oil injection branch; the main oil injection pipe being connected to the second end of the first pipe, the oil injection branch being connected to the second end of the third pipe; the main oil injection pipe being provided with a main oil injection valve, the second end of the first pipe being provided with a first oil injection valve, the second end of the third pipe being provided with a second oil injection valve.

[0011] In some embodiments, the oil injection device is further connected to an oil discharge pipe, the oil discharge pipe being connected to the oil injection branch, the oil discharge pipe being provided with an oil discharge valve; the main oil injection pipe and the oil discharge pipe are further directly communicated through a circulation pipe.

[0012] In some embodiments, the main oil injection pipe is further provided with an oil injection manual valve, the oil discharge pipe is further provided with an oil discharge manual valve, and the circulation pipe is provided with a circulation manual valve.

[0013] In some embodiments, the first evacuation and oil injection module and the second evacuation and oil injection module are both connected to the same air pressure measurement module.

[0014] In some embodiments, the air pressure measurement module comprises a vacuum probe connected to a main measurement pipe, the main measurement pipe being connected to a first measurement branch and a second measurement branch; the first measurement branch being connected to the first pipe, the second measurement branch being connected to the third pipe; the first measurement branch being provided with a first measurement valve, the second measurement branch being provided with a second measurement valve.

[0015] In some embodiments, the first end of the second pipeline is connected to the first pipeline, the second end of the second pipeline is connected to a first connecting branch and a second connecting branch, the first connecting branch and the second connecting branch are respectively connected to extra-high voltage bushings, the first connecting branch is provided with a first connecting valve, and the second connecting branch is provided with a second connecting valve; the first end of the fourth pipeline is connected to the third pipeline, the second end of the fourth pipeline is connected to a third connecting branch and a fourth connecting branch, the third connecting branch and the fourth connecting branch are respectively connected to extra-high voltage bushings, the third connecting branch is provided with a third connecting valve, and the fourth connecting branch is provided with a fourth connecting valve.

[0016] In some embodiments, a control module is further included; the evacuation main valve, the first evacuation valve, the second evacuation valve, the oil injection main valve, the first oil injection valve, the second oil injection valve, the oil discharge valve, the first measurement valve, and the second measurement valve are all automatic valves and are all in communication connection with the control module.

[0017] The extra-high voltage bushing evacuation and oil injection system provided in the application includes at least two groups of evacuation and oil injection modules, each group of evacuation and oil injection modules is connected to at least two extra-high voltage bushings, at least two groups of evacuation and oil injection modules are connected to the same vacuum module, and at least two groups of evacuation and oil injection modules are connected to the same oil injection module, so that at least two extra-high voltage bushings can be subjected to evacuation and oil injection operation through one group of evacuation and oil injection modules, the efficiency of evacuation and oil injection of the extra-high voltage bushing is improved, and each group of evacuation and oil injection modules includes at least one pipeline that can be shared by evacuation and oil injection, the pipeline structure is simplified, evacuation and oil injection operation can be performed in cooperation, and the efficiency of evacuation and oil injection of the extra-high voltage bushing is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of the provided drawings.

[0019] Figure 1 A schematic diagram of the extra-high voltage bushing evacuation and oil injection system provided in the embodiments of the application.

[0020] MARKED FOR EXPLANATION:

[0021] 100-first pipeline, 110-first evacuation valve, 120-first oil injection valve;

[0022] 200 - second line, 210 - first connection branch, 211 - first connection valve, 220 - second connection branch, 221 - second connection valve;

[0023] 300 - third line, 310 - second evacuation valve, 320 - second oiling valve;

[0024] 400 - fourth line, 410 - third connection branch, 411 - third connection valve, 420 - fourth connection branch, 421 - fourth connection valve;

[0025] 500 - vacuum unit, 510 - evacuation main line, 511 - evacuation main valve, 512 - manual evacuation valve, 520 - first evacuation branch, 530 - second evacuation branch;

[0026] 610 - oiling main line, 611 - oiling main valve, 612 - oiling manual valve, 620 - oiling branch, 630 - oil discharge line, 631 - oil discharge valve, 632 - oil discharge manual valve, 640 - circulation line, 641 - circulation manual valve;

[0027] 700 - vacuum probe, 710 - measurement main line, 720 - first measurement branch, 721 - first measurement valve, 730 - second measurement branch, 731 - second measurement valve. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. The terms used in the following embodiments are only for the purpose of describing the specific embodiments, and are not intended to be limiting on the present application. As used in the specification and the appended claims of the present application, the singular forms "a," "an," "said," "the," "above," "this," and "that" are intended to include, for example, the expression "one or more," unless the context clearly indicates to the contrary. It should also be understood that in the embodiments of the present application, "one or more" means one, two, or more than two; "and / or" describes the association relationship of the associated objects, which means that there can be three relationships; for example, A and / or B can represent the following three cases: A exists alone, A and B exist together, and B exists alone, where A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects.

[0030] Reference within this specification to "one embodiment" or "some embodiments" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrase "in one embodiment" or "in some embodiments" in various places within this specification are not necessarily all referring to the same embodiment, however, and can refer to one or more but less than all embodiments of the application, unless otherwise specified. The terms "including," "containing," "having," and variations thereof are meant to encompass the terms "consisting of" and "consisting essentially of" unless otherwise noted.

[0031] The plurality of embodiments of the present application refers to greater than or equal to two. It should be noted that in the description of the embodiments of the present application, the terms "first", "second", etc. are only used for the purpose of distinguishing the description, and cannot be understood as indicating or implying relative importance, nor can it be understood as indicating or implying order.

[0032] As shown in Figure 1 The ultra-high voltage bushing evacuation and oil injection system provided by the embodiments of the present application includes at least two groups of evacuation and oil injection modules, each group of evacuation and oil injection modules is connected with at least two ultra-high voltage bushings, the at least two groups of evacuation and oil injection modules are connected with the same vacuum module, and the at least two groups of evacuation and oil injection modules are connected with the same oil injection module. Thus, the evacuation and oil injection operation can be performed on at least two ultra-high voltage bushings through one group of evacuation and oil injection modules, the efficiency of the evacuation and oil injection of the ultra-high voltage bushing is improved, and each group of evacuation and oil injection modules includes at least one pipeline that can be used for evacuation and oil injection, the pipeline structure is simplified, the evacuation and oil injection operations can be performed in cooperation, and the efficiency of the evacuation and oil injection of the ultra-high voltage bushing is further improved.

[0033] It should be noted that in some embodiments, the same vacuum module or oil injection module can be connected with two groups, three groups, four groups or more groups of evacuation and oil injection modules synchronously, and can be connected synchronously through different docking components such as three-way valves, four-way valves, six-way valves, etc. The specific number of connection operations can be performed according to actual conditions, and the embodiments of the present application do not limit this.

[0034] Similarly, in some embodiments, each group of evacuation and oil injection modules can be connected with two, three, four or more ultra-high voltage bushings, and can be connected synchronously through different docking components such as three-way valves, four-way valves, six-way valves, etc. The specific number of connection operations can be performed according to actual conditions, and the embodiments of the present application do not limit this.

[0035] For example, Figure 1As shown, the oil injection and evacuation module includes a first oil injection and evacuation module and a second oil injection and evacuation module; wherein the first oil injection and evacuation module includes a first pipeline 100 and a second pipeline 200 in communication with each other, the first pipeline 100 is connected with the vacuum module and the oil injection module, and the second pipeline 200 is connected with two extra-high voltage bushings, so as to connect the vacuum module and the oil injection module through the first pipeline 100, and simultaneously perform oil injection and evacuation operations on the two extra-high voltage bushings through the second pipeline 200, so as to improve the oil injection and evacuation efficiency of the extra-high voltage bushings.

[0036] Further, as shown in Figure 1 the second oil injection and evacuation module includes a third pipeline 300 and a fourth pipeline 400 in communication with each other, the third pipeline 300 is connected with the vacuum module and the oil injection module, and the fourth pipeline 400 is connected with two extra-high voltage bushings, so as to connect the vacuum module and the oil injection module through the third pipeline 300, and simultaneously perform oil injection and evacuation operations on the two extra-high voltage bushings through the fourth pipeline 400, so as to improve the oil injection and evacuation efficiency of the extra-high voltage bushings.

[0037] It should be noted that the extra-high voltage bushings connected with the same group of oil injection and evacuation modules will perform the same oil injection and evacuation operation due to being connected with the same pipeline, of course, only one extra-high voltage bushing can be selected to perform the oil injection and evacuation operation, but if more than two extra-high voltage bushings are operated at the same time, the operation types of the more than two extra-high voltage bushings are the same, that is, synchronous evacuation or synchronous oil injection; however, the extra-high voltage bushings connected with different groups of oil injection and evacuation modules can be selected to perform different types of operations, that is, the extra-high voltage bushings connected with different groups of oil injection and evacuation modules can be selected to perform synchronous evacuation or oil injection, one group of evacuation and one group of oil injection, one group of oil injection and one group of evacuation, or one group of operation, so that the oil injection and evacuation system for the extra-high voltage bushings provided by the embodiment of the present application can be flexibly selected according to the actual situation, and the embodiment of the present application does not limit this.

[0038] As shown in Figure 1 the vacuum module includes a vacuum unit 500, the vacuum unit 500 is connected with an evacuation main pipeline 510, the evacuation main pipeline 510 is connected with a first evacuation branch 520 and a second evacuation branch 530; wherein the first evacuation branch 520 is connected with a first end of the first pipeline 100, the second evacuation branch 530 is connected with a first end of the third pipeline 300, an evacuation main valve 511 is arranged on the evacuation main pipeline 510, a first end of the first pipeline 100 is provided with a first evacuation valve 110, and a first end of the third pipeline is provided with a second evacuation valve 310.

[0039] Thus, when it is necessary to perform evacuation operations on the UHV bushing connected to the first evacuation and oil injection module, opening the evacuation main valve 511 and the first evacuation valve 110 allows the vacuum unit 500 to perform evacuation operations on the UHV bushing connected to the first evacuation and oil injection module sequentially through the evacuation main pipeline 510, the first evacuation branch 520, the first pipeline 100, and the second pipeline 200.

[0040] Similarly, when it is necessary to perform evacuation operations on the UHV bushing connected to the second evacuation and oil injection module, opening the main evacuation valve 511 and the second evacuation valve 310 allows the vacuum unit 500 to perform evacuation operations on the UHV bushing connected to the second evacuation and oil injection module sequentially through the main evacuation pipeline 510, the second evacuation branch 530, the third pipeline 300, and the fourth pipeline 400.

[0041] It is understandable that the evacuation and oil injection modules of the first and second evacuation and oil injection modules can operate simultaneously or independently, and the corresponding valves can be opened and closed as needed.

[0042] To provide maintenance and backup functions, such as Figure 1 As shown, the evacuation module is also connected to a vacuum backup unit. A manual evacuation valve 512 is installed on the main evacuation pipeline 510 to provide maintenance and backup functions. In actual operation, the manual evacuation valve 512 is normally open and does not affect the evacuation operation of the evacuation module.

[0043] like Figure 1 As shown, the oil injection module includes an oil injection device connected to an oil injection main pipeline 610, and an oil injection branch pipeline 620 connected to the oil injection main pipeline 610. The oil injection main pipeline 610 is connected to the second end of the first pipeline 100, and the oil injection branch pipeline 620 is connected to the second end of the third pipeline 300. An oil injection main valve 611 is provided on the oil injection main pipeline 610, a first oil injection valve 120 is provided at the second end of the first pipeline 100, and a second oil injection valve 320 is provided at the second end of the third pipeline.

[0044] Thus, when it is necessary to perform oil injection on the UHV bushing connected to the first evacuation and oil injection module, by opening the main oil injection valve 611 and the first oil injection valve 120, the oil injection equipment can sequentially perform oil injection on the UHV bushing connected to the first evacuation and oil injection module through the main oil injection pipeline 610, the first pipeline 100, and the second pipeline 200.

[0045] Similarly, when it is necessary to perform oil injection on the UHV bushing connected to the second evacuation oil injection module, by opening the main oil injection valve 611 and the second oil injection valve 320, the oil injection equipment can sequentially perform oil injection on the UHV bushing connected to the second evacuation oil injection module through the main oil injection pipeline 610, the oil injection branch 620, the third pipeline 300, and the fourth pipeline 400.

[0046] It is understandable that the oil injection operations of the first evacuation and oil injection module and the second evacuation and oil injection module can be carried out simultaneously or separately, and the corresponding valves can be opened and closed as needed.

[0047] It should be noted that, since the evacuation and oil injection operations are carried out through the same set of pipelines within the same evacuation and oil injection module, the corresponding valve for the oil injection operation is closed when evacuation is being performed; similarly, the corresponding valve for the evacuation operation is closed when oil injection is being performed, in order to avoid mutual interference between the evacuation and oil injection operations within the same evacuation and oil injection module.

[0048] After the UHV bushing is filled with oil, in order to avoid the problem of excessive pressure in the UHV bushing caused by the thermal expansion and contraction of the transformer oil, resulting in oil leakage, a partial oil draining operation will be performed on the UHV bushing to allow space for the thermal expansion and contraction of the transformer oil. Therefore, the oil filling equipment in the UHV bushing evacuation and oil filling system provided in this application embodiment is also connected to an oil draining pipeline 630, which is connected to an oil filling branch 620. An oil draining valve 631 is installed on the oil draining pipeline 630.

[0049] Thus, when it is necessary to drain oil from the UHV pipeline connected to the first evacuation and oil injection module, the drain valve 631 and the first oil injection valve 120 are opened, allowing the oil injection equipment to drain oil from the UHV pipeline connected to the first evacuation and oil injection module through the drain pipeline 630, the oil injection branch 620, the first pipeline 100, and the second pipeline 200.

[0050] Similarly, when it is necessary to drain oil from the UHV pipeline connected to the second evacuation and oil injection module, the drain valve 631 and the second injection valve 320 are opened, so that the oil injection equipment can drain oil from the UHV pipeline connected to the second evacuation and oil injection module through the drain pipeline 630, the injection branch 620, the third pipeline 300, and the fourth pipeline 400.

[0051] It is understandable that the oil draining operations of the first evacuation and oil injection module and the second evacuation and oil injection module can be carried out simultaneously or separately, and the corresponding valves can be opened and closed as needed.

[0052] Before the oil injection operation, the cold oil in the main oil injection line 610 needs to be drained so that hot oil can be injected through the main oil injection line 610. In this application, the main oil injection line 610 and the oil discharge line 630 are directly connected by a circulation line 640. A circulation manual valve 641 is installed on the circulation line 640. By opening the circulation manual valve 641, the cold oil in the main oil injection line 610 can be directly discharged through the circulation line 640, ensuring that hot oil is injected into the UHV bushing.

[0053] To provide maintenance and backup functions, such as Figure 1 As shown, a manual oil injection valve 612 is installed on the main oil injection pipeline 610, and a manual oil drain valve 632 is installed on the oil drain pipeline 630 to provide maintenance and backup functions. In actual operation, the manual oil injection valve 612 and the manual oil drain valve 632 are normally open and do not affect the actual operation of the oil injection module.

[0054] To ensure the evacuation effect of the UHV bushing, it is necessary to monitor the vacuum pressure of the UHV bushing during the evacuation operation. The UHV bushing evacuation and oil injection system provided in this application also includes a pressure measurement module, such as... Figure 1 As shown, both the first evacuation and oil injection module and the second evacuation and oil injection module are connected to the same air pressure measurement module to reduce pipeline connections, improve measurement convenience, and increase efficiency.

[0055] like Figure 1 As shown, the air pressure measurement module includes a vacuum probe 700, which is connected to a main measuring line 710. The main measuring line 710 is connected to a first measuring branch 720 and a second measuring branch 730. The first measuring branch 720 is connected to a first pipeline 100, and the second measuring branch 730 is connected to a third pipeline 300. A first measuring valve 721 is provided on the first measuring branch 720, and a second measuring valve 731 is provided on the second measuring branch 730.

[0056] In this way, when it is necessary to measure the air pressure in the first evacuation and oil injection module during the evacuation process, the first measuring valve 721 can be opened to measure the air pressure in the first evacuation and oil injection module.

[0057] Similarly, if it is necessary to measure the air pressure in the second evacuation and oil injection module during the evacuation process, the second measuring valve 731 can be opened to measure the air pressure in the second evacuation and oil injection module.

[0058] Understandably, the air pressure measurement operations of the first evacuation and oil injection module and the second evacuation and oil injection module can be carried out simultaneously or separately, and the corresponding valves can be opened and closed as needed.

[0059] like Figure 1 As shown, the first end of the second pipeline 200 is connected to the first pipeline 100, and the second end of the second pipeline 200 is connected to a first connecting branch 210 and a second connecting branch 220. The first connecting branch 210 and the second connecting branch 220 are respectively connected to an ultra-high voltage bushing. A first connecting valve 211 is provided on the first connecting branch 210, and a second connecting valve 221 is provided on the second connecting branch 220. In actual operation, the corresponding ultra-high voltage bushing connected to the first evacuation and oil injection module can be evacuated and oiled by opening the corresponding valves.

[0060] like Figure 1 As shown, the first end of the fourth pipeline 400 is connected to the third pipeline 300, and the second end of the fourth pipeline 400 is connected to the third connecting branch 410 and the fourth connecting branch 420. The third connecting branch 410 and the fourth connecting branch 420 are respectively connected to an ultra-high voltage bushing. The third connecting branch 410 is equipped with a third connecting valve 411, and the fourth connecting branch 420 is equipped with a fourth connecting valve 421. In actual operation, the corresponding ultra-high voltage bushing connected to the second evacuation and oil injection module can be evacuated and oiled by opening the corresponding valves.

[0061] To further improve the operating efficiency of the UHV bushing evacuation and oil injection system provided in this application, and to enhance its intelligence level, this application also includes a control module.

[0062] For ease of operation, the main evacuation valve 511, the first evacuation valve 110, the second evacuation valve 310, the main oil injection valve 611, the first oil injection valve 120, the second oil injection valve 320, the oil discharge valve 631, the first measuring valve 721, and the second measuring valve 731 in this application are all automatic valves and are communicatively connected to the control module so that the corresponding valve can be opened by the control module according to the required evacuation or oil injection operation.

[0063] Of course, the first connecting valve 211, the second connecting valve 221, the third connecting valve 411, and the fourth connecting valve 421 connected to the corresponding UHV bushing can also be automatic valves, controlled by a control module; or, in other embodiments, the first connecting valve 211, the second connecting valve 221, the third connecting valve 411, and the fourth connecting valve 421 can also be manual valves to improve safety performance. This application does not limit this aspect.

[0064] In actual operation, evacuation and oil injection operations can be performed on different groups of UHV bushings as needed, specifically including:

[0065] I. The first evacuation and oil injection module evacuates the system; the second evacuation and oil injection module injects oil.

[0066] The control module controls the opening of the main evacuation valve 511, the first evacuation valve 110, the first connecting valve 211, the second connecting valve 221, and the first measuring valve 721; and the closing of the second evacuation valve 310 and the second measuring valve 731, so that the vacuum unit can perform evacuation operations on the ultra-high voltage bushing connected to the first evacuation and oil injection module.

[0067] The control module synchronously controls the opening of the main oil injection valve 611, the second oil injection valve 320, the third connecting valve 411, and the fourth connecting valve 421; and closes the first oil injection valve 120 and the drain valve 631, so that the oil injection equipment can perform oil injection operations on the UHV bushing connected to the second evacuation oil injection module.

[0068] II. Oil injection into the first evacuation and oil injection module, and evacuation into the second evacuation and oil injection module.

[0069] The control module controls the opening of the main oil injection valve 611, the first oil injection valve 120, the first connecting valve 211, and the second connecting valve 221; and the closing of the second oil injection valve 320 and the drain valve 631, so that the oil equipment can perform oil injection operations on the UHV bushing connected to the first evacuation and oil injection module.

[0070] The control module synchronously controls the opening of the main evacuation valve 511, the second evacuation valve 310, the third connecting valve 411, the fourth connecting valve 421, and the second measuring valve 731; and closes the first evacuation valve 110 and the first measuring valve 721, so that the vacuum unit can perform evacuation operations on the ultra-high pressure bushing connected to the second evacuation and oil injection module.

[0071] III. The first evacuation and oil injection module and the second evacuation and oil injection module simultaneously evacuate.

[0072] The control module controls the opening of the main evacuation valve 511, the first evacuation valve 110, the second evacuation valve 310, the first connecting valve 211, the second connecting valve 221, the third connecting valve 411, the fourth connecting valve 421, the first measuring valve 721, and the second measuring valve 731; and the closing of the main oil injection valve 611, the first oil injection valve 120, the second oil injection valve 320, and the oil discharge valve 631, so that the vacuum unit can synchronously perform evacuation operations on the UHV bushings connected to the first evacuation and oil injection modules and the second evacuation and oil injection modules.

[0073] It should be noted that either the first measuring valve 721 or the second measuring valve 731 can be opened separately to test a single group of UHV bushings, and the choice can be made according to actual needs.

[0074] IV. Simultaneous oil injection by the first evacuation oil injection module and the second evacuation oil injection module.

[0075] The control module controls the opening of the main oil injection valve 611, the first oil injection valve 120, the second oil injection valve 320, the first connecting valve 211, the second connecting valve 221, the third connecting valve 411, and the fourth connecting valve 421; and the closing of the drain valve 631, the main evacuation valve 511, the first evacuation valve 110, the second evacuation valve 310, the first measuring valve 721, and the second measuring valve 731, so that the oil injection unit can synchronously perform oil injection operations on the UHV bushing connected to the first evacuation oil injection membrane and the second evacuation oil injection module.

[0076] The UHV bushing evacuation and oil injection system provided in this application connects two sets of evacuation and oil injection modules to the same set of vacuum and oil injection modules, enabling synchronous evacuation or oil injection operations on the two sets of modules. Furthermore, by controlling the opening and closing of different valves, different types of operations can be performed on different sets of UHV bushings as needed, allowing for evacuation or oil injection operations on multiple UHV bushings as required, thus improving the efficiency of UHV bushing evacuation and oil injection. Simultaneously, within the same set of evacuation and oil injection modules, evacuation and oil injection operations can be achieved through the same set of pipelines, simplifying the pipeline structure and enabling coordinated operation of evacuation and oil injection, further improving the efficiency of UHV bushing evacuation and oil injection.

[0077] The above description of the embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-voltage bushing evacuation and oil injection system, characterized in that, include: At least two sets of evacuation and oil injection modules, each set of which is connected to at least two ultra-high voltage bushings; In this configuration, at least two sets of the vacuum-injection and oil-filling modules are connected to the same vacuum module, and at least two sets of the vacuum-injection and oil-filling modules are connected to the same oil-filling module. Each evacuation and oil injection module includes at least one pipeline shared by both evacuation and oil injection.

2. The UHV bushing evacuation and oil injection system according to claim 1, characterized in that, The evacuation and oil injection module includes a first evacuation and oil injection module and a second evacuation and oil injection module; The first vacuum injection module includes a first pipeline (100) and a second pipeline (200) that are interconnected. The first pipeline (100) connects the vacuum module and the injection module, and the second pipeline (200) connects two ultra-high voltage bushings. The second vacuum and oil injection module includes a third pipeline (300) and a fourth pipeline (400) that are interconnected. The third pipeline (300) connects the vacuum module and the oil injection module, and the fourth pipeline (400) connects two ultra-high voltage bushings.

3. The UHV bushing evacuation and oil injection system according to claim 2, characterized in that, The vacuum module includes a vacuum unit (500), which is connected to a main evacuation line (510), and the main evacuation line (510) is connected to a first evacuation branch (520) and a second evacuation branch (530). The first evacuation branch (520) is connected to the first end of the first pipeline (100), and the second evacuation branch (530) is connected to the first end of the third pipeline (300); The main evacuation pipeline (510) is equipped with an evacuation main valve (511), the first end of the first pipeline (100) is equipped with a first evacuation valve (110), and the first end of the third pipeline (300) is equipped with a second evacuation valve (310).

4. The UHV bushing evacuation and oil injection system according to claim 3, characterized in that, The oil injection module includes an oil injection device, which is connected to an oil injection main line (610), and the oil injection main line (610) is connected to an oil injection branch (620). The main oil injection line (610) is connected to the second end of the first line (100), and the oil injection branch (620) is connected to the second end of the third line (300); The main oil injection pipeline (610) is equipped with an oil injection main valve (611), the second end of the first pipeline (100) is equipped with a first oil injection valve (120), and the second end of the third pipeline (300) is equipped with a second oil injection valve (320).

5. The UHV bushing evacuation and oil injection system according to claim 4, characterized in that, The oil injection equipment is also connected to an oil drain line (630), which is connected to the oil injection branch (620). An oil drain valve (631) is provided on the oil drain line (630). The main oil injection pipeline (610) and the oil discharge pipeline (630) are also directly connected through a circulation pipeline (640).

6. The UHV bushing evacuation and oil injection system according to claim 5, characterized in that, The main oil injection pipeline (610) is also equipped with an oil injection manual valve (612), the oil discharge pipeline (630) is also equipped with an oil discharge manual valve (632), and the circulation pipeline (640) is equipped with a circulation manual valve (641).

7. The UHV bushing evacuation and oil injection system according to claim 5, characterized in that, Both the first evacuation and oil injection module and the second evacuation and oil injection module are connected to the same air pressure measurement module.

8. The UHV bushing evacuation and oil injection system according to claim 7, characterized in that, The air pressure measurement module includes a vacuum probe (700), which is connected to a main measuring line (710). The main measuring line (710) is connected to a first measuring branch (720) and a second measuring branch (730). The first measuring branch (720) is connected to the first pipeline (100), and the second measuring branch (730) is connected to the third pipeline (300). The first measuring branch (720) is provided with a first measuring valve (721), and the second measuring branch (730) is provided with a second measuring valve (731).

9. The UHV bushing evacuation and oil injection system according to claim 2, characterized in that, The first end of the second pipeline (200) is connected to the first pipeline (100), and the second end of the second pipeline (200) is connected to a first connecting branch (210) and a second connecting branch (220). The first connecting branch (210) and the second connecting branch (220) are respectively connected to an ultra-high voltage bushing. A first connecting valve (211) is provided on the first connecting branch (210), and a second connecting valve (221) is provided on the second connecting branch (220). The first end of the fourth pipeline (400) is connected to the third pipeline (300), and the second end of the fourth pipeline (400) is connected to a third connecting branch (410) and a fourth connecting branch (420). The third connecting branch (410) and the fourth connecting branch (420) are respectively connected to ultra-high voltage bushings. A third connecting valve (411) is provided on the third connecting branch (410), and a fourth connecting valve (421) is provided on the fourth connecting branch (420).

10. The ultra-high voltage bushing evacuation and oil injection system according to claim 8, characterized in that, It also includes a control module; The main evacuation valve (511), the first evacuation valve (110), the second evacuation valve (310), the main oil injection valve (611), the first oil injection valve (120), the second oil injection valve (320), the oil discharge valve (631), the first measuring valve (721), and the second measuring valve (731) are all automatic valves and are all communicatively connected to the control module.

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