Crossing type transition connection device and method for electrical test in transformer substation

Abstract

The invention relates to a crossing type transition connection device and method for an electrical test in a transformer substation, the crossing type transition connection device is used for connecting power supply equipment and to-be-tested equipment in the transformer substation, the crossing type transition connection device comprises a full-shielding pipeline, a plurality of plugging systems and a voltage withstanding system, the plurality of pressure-resistant systems are respectively connected to each end of the full-shielding pipeline, the pressure-resistant systems are in one-to-one correspondence with the plugging systems, and each pressure-resistant system is connected with the corresponding plugging system in a pluggable manner; insulating gas is filled between the voltage withstanding system and the plugging system. The plugging system comprises a pushing sleeve, a stress cone and a guide rod contact which are connected in sequence; the voltage withstanding system comprises a lower electrode, an inner insulating shell, an outer insulating shell, a voltage equalizing cover, a telescopic conducting rod, a connecting rod, an upper flange and a power receiving head. Compared with the prior art, the device has the advantages that the device can pass through obstacles in the transformer substation flexibly, is convenient to disassemble and assemble, improves the test efficiency and the like.

Description

Technical Field

[0001] The invention relates to the field of electrical test equipment in a transformer substation, and in particular to a through-type transition connection device and method for electrical testing in a transformer substation. Background Art

[0002] As urban construction land becomes increasingly scarce, switch stations are now being built more and more compactly. There are also more devices in switch stations. When conducting electrical tests on these devices, it is necessary to introduce external power frequency high voltage into the station, which requires compliance with a series of technical requirements and safety measures. According to relevant regulations: the test voltage value that the equipment should be able to withstand is usually determined based on the rated voltage of the equipment. For example, for equipment with a rated voltage of 64 / 110kV, the test voltage is twice the U 0 (U 0 =64kV), the test time is 60 minutes.

[0003] In this case, the power frequency withstand voltage test cannot be effectively carried out, and the equipment in the substation can only be tested for 24 hours without load, and the no-load voltage is the rated voltage. 0 The voltage is 64kV, which is far lower than the 128kV required by the regulations. It cannot effectively check equipment defects. In view of the above technical problems, the requirements for new test equipment are proposed:

[0004] Choose small electrical test equipment to reduce space usage.

[0005] By using mobile testing equipment, the testing stations can be flexibly arranged as needed.

[0006] Utilize mechanized systems to reduce manpower requirements and improve testing efficiency.

[0007] Use fully shielded pipelines to prevent arcing and electric shock when crossing obstacles. Summary of the invention

[0008] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and to provide a through-type transition connection device and method for electrical testing in a substation, which can pass through obstacles in the substation, has flexible crossing capabilities, and is easy to disassemble and assemble, thereby improving test efficiency.

[0009] The purpose of the present invention can be achieved by the following technical solutions:

[0010] A through-type transition connection device for electrical testing in a substation is used to respectively connect power supply equipment and equipment to be tested in the substation. The through-type transition connection device includes a fully shielded pipeline, a plug-in system and a withstand voltage system. There are multiple plug-in systems, which are respectively connected to each end of the fully shielded pipeline. There are multiple withstand voltage systems, which correspond one-to-one to the plug-in systems. Each withstand voltage system can be plugged in and connected to the corresponding plug-in system. Insulating gas is filled between the withstand voltage system and the plug-in system.

[0011] Furthermore, the plug-in system comprises a push sleeve, a stress cone and a guide rod contact connected in sequence, the wire core of the fully shielded pipeline passes through the push sleeve and the stress cone, and is electrically connected to the guide rod contact;

[0012] The withstand voltage system comprises a lower electrode, an inner insulating shell, an outer insulating shell, a voltage-equalizing cover, a telescopic conductive rod, a connecting rod, an upper flange and a power receiving head, wherein the lower electrode and the upper flange are respectively connected to the two ends of the outer insulating shell, the inner insulating shell, the voltage-equalizing cover, the telescopic conductive rod and the connecting rod are all located on the inner side of the outer insulating shell, one end of the inner insulating shell is connected to the lower electrode, and the other end is connected to the voltage-equalizing cover, the voltage-equalizing cover, the telescopic conductive rod, the connecting rod and the power receiving head are connected in sequence, and the power receiving head extends out of the outer insulating shell through the upper flange and is used to connect a power supply device or a device to be tested;

[0013] The pushing sleeve is detachably connected to the inner insulating shell, the stress cone and the guide rod contact penetrate into the inner insulating shell, and the guide rod contact is conductively connected to the telescopic conductive rod.

[0014] Furthermore, the inner insulating shell is a cylindrical structure with a gradually contracting inner space, the end with a larger opening of the inner insulating shell is connected to the lower electrode, and the end with a smaller opening is connected to the voltage equalizing cover; the size of the internal space of the inner insulating shell matches the size of the stress cone.

[0015] Furthermore, the plug-in system and the fully shielded pipeline are prefabricated into an integrated structure.

[0016] Furthermore, there are two plug-in systems, which are respectively connected to two ends of the fully shielded pipeline, and there are two pressure-resistant systems, which are respectively pluggable and connected to the corresponding plug-in systems.

[0017] Furthermore, the through-type transition connection device is used in electrical test scenarios within a substation with limited space.

[0018] Furthermore, the fully shielded pipeline passes through obstacles in the substation and is connected to the equipment to be tested in the substation.

[0019] The present invention also provides an operating method of a through-type transition connection device for electrical testing in a substation as described above, comprising the following steps:

[0020] Place each withstand voltage system at the location of the power supply equipment and the equipment to be tested in the substation;

[0021] Insert the plug-in system at one end of the fully shielded pipeline into the withstand voltage system on the side of the device under test and connect the power receiving head of the withstand voltage system to the device under test;

[0022] The plug-in system at the other end of the fully shielded pipeline passes through the obstacles of the substation, is inserted into and connected to the voltage-resistant system on the power supply equipment side, and the power receiving head of the voltage-resistant system is connected to the power supply equipment.

[0023] Furthermore, the method further comprises:

[0024] When phase change is required, the test can be carried out by connecting the front-end power receiving head of the withstand voltage system on the side of the equipment to be tested to the phase to be tested with a high-voltage lead.

[0025] Furthermore, the barrier of the substation is provided with through holes for the full shielded pipeline and the plug-in system to pass through.

[0026] Compared with the prior art, the present invention has the following advantages:

[0027] (1) Modular design: The modular design of the through-type transition connection device of the present invention allows it to be prefabricated into two independent parts in the factory. This innovation makes on-site assembly fast and efficient. The beneficial effect is that the time and complexity of on-site construction are significantly reduced, and the efficiency of equipment handling and assembly is improved.

[0028] (2) Flexible penetration capability: The plug-in system of the device only includes a push sleeve, a stress cone and a guide rod contact, which are axially distributed and have a small longitudinal width. It can flexibly pass through narrow spaces in the substation, such as narrow walls and narrow windows. This innovation greatly saves space. The beneficial effect is to improve the adaptability and flexibility in limited space, so that electrical tests can be carried out smoothly in a space-constrained environment.

[0029] (3) Improved safety: The device adopts full shielding protection safety measures, including the outer shielding layer of the fully shielded pipeline, the inner insulating shell of the pressure-resistant system, the outer insulating shell and the pressure equalizing cover, which ensures the safety of the test personnel and equipment. The beneficial effect is to improve the safety of the test and reduce the potential safety risks in electrical testing.

[0030] (4) Improve test efficiency: The modular design and flexible ride-through capability work together to significantly improve the efficiency of electrical testing, making the withstand voltage test in the substation faster and more convenient, and reducing the test preparation time.

[0031] (5) Easy operation: The design of the device takes into account the convenience of on-site operation. The phase change operation only requires connecting the high-voltage lead on the side of the test equipment, and there is no need to disassemble the test device structure. When changing the test site, only the plug-in system needs to be unplugged, and the withstand voltage system does not need to be disassembled. There is no need to evacuate or fill the insulating gas at the test site. The beneficial effect is that it makes it simple and quick to conduct electrical tests phase by phase, which improves work efficiency and reduces the error rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of a through-type transition connection device for electrical testing in a substation provided in an embodiment of the present invention;

[0033] In the figure, 1. pressure-resistant system, 11. lower electrode, 12. inner insulating shell, 13. outer insulating shell, 14. voltage-equalizing cover, 15. telescopic conductive rod, 16. connecting rod, 17. upper flange, 18. receiving head, 2. insulating gas, 3. plug-in system, 31. push sleeve, 32. stress cone, 33. guide rod contact, 4. fully shielded pipeline, 5. obstacle. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0037] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0038] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0039] Example 1

[0040] like Figure 1 As shown, the present embodiment provides a through-type transition connection device for electrical testing in a substation, which is used to respectively connect power supply equipment and equipment to be tested in the substation, and the through-type transition connection device includes a fully shielded pipeline 4, a plug-in system 3 and a withstand voltage system 1. There are multiple plug-in systems 3, which are respectively connected to each end of the fully shielded pipeline 4, and there are multiple withstand voltage systems 1, which correspond one to one with the plug-in systems 3. Each withstand voltage system 1 can be plugged in and connected to the corresponding plug-in system 3; insulating gas 2 is filled between the withstand voltage system 1 and the plug-in system 3.

[0041] The plug-in system 3 comprises a push sleeve 31, a stress cone 32 and a guide rod contact 33 which are connected in sequence. The core of the fully shielded pipeline 4 passes through the push sleeve 31 and the stress cone 32 and is electrically connected to the guide rod contact 33.

[0042] The withstand voltage system 1 comprises a lower electrode 11, an inner insulating shell 12, an outer insulating shell 13, a voltage grading cover 14, a telescopic conductive rod 15, a connecting rod 16, an upper flange 17 and a receiving head 18, wherein the lower electrode 11 and the upper flange 17 are respectively connected to the two ends of the outer insulating shell 13, the inner insulating shell 12, the voltage grading cover 14, the telescopic conductive rod 15 and the connecting rod 16 are all located on the inner side of the outer insulating shell 13, one end of the inner insulating shell 12 is connected to the lower electrode 11, and the other end is connected to the voltage grading cover 14, the voltage grading cover 14, the telescopic conductive rod 15, the connecting rod 16 and the receiving head 18 are connected in sequence, and the receiving head 18 extends out of the outer insulating shell 13 through the upper flange 17, and is used to connect a power supply device or a device to be tested;

[0043] The pushing sleeve 31 is detachably connected to the inner insulating shell 12 , the stress cone 32 and the guide rod contact 33 penetrate into the inner insulating shell 12 , and the guide rod contact 33 is conductively connected to the telescopic conductive rod 15 .

[0044] Preferably, the inner insulating shell 12 is a cylindrical structure with a gradually narrowed inner space, the larger opening end of the inner insulating shell 12 is connected to the lower electrode 11 , and the smaller opening end is connected to the voltage equalizing cover 14 ; the size of the internal space of the inner insulating shell 12 matches the size of the stress cone 32 .

[0045] The pressure-resistant system 1 needs to be installed on the plug-in system 3 for use, and is fixed to the plug-in system 3 via a pushing sleeve 31 .

[0046] Preferably, the plug-in system 3 and the fully shielded pipeline 4 are prefabricated into an integrated structure, and the pressure-resistant system 1 can be installed on site without assembling the components one by one on site.

[0047] The through-type transition connection device of this scheme is equipped with a fully shielded pipeline, an inner insulating shell, an outer insulating shell and a voltage-equalizing cover to provide all-round shielding protection for the wire cores in the fully shielded pipeline. During electrical tests, no arc or electric shock will occur.

[0048] In this embodiment, there are two plug-in systems 3 , which are respectively connected to the two ends of the fully shielded pipeline 4 , and there are two pressure-resistant systems 1 , which are respectively pluggable and connected to the corresponding plug-in systems 3 .

[0049] This through-type transition connection device is suitable for electrical test scenarios in substations with limited space. When in use, the plug-in system 3 at one end is passed through obstacles in the substation with the fully shielded pipeline 4 to connect the equipment to be tested in the substation.

[0050] Example 2

[0051] This embodiment provides an operation method of a through-type transition connection device for electrical testing in a substation as in Embodiment 1, comprising the following steps:

[0052] Each withstand voltage system 1 is placed at the location of the power supply equipment and the equipment to be tested in the substation;

[0053] Insert the plug-in system 3 at one end of the fully shielded pipeline 4 into and connect it to the withstand voltage system 1 on the side of the device under test, and connect the power receiving head 18 of the withstand voltage system 1 to the device under test;

[0054] The plug-in system 3 at the other end of the fully shielded pipeline 4 passes through the obstacle of the substation, is inserted into and connected to the voltage-resistant system 1 on the power supply equipment side, and the power receiving head 18 of the voltage-resistant system 1 is connected to the power supply equipment; the obstacle has a through hole for the fully shielded pipeline 4 and the plug-in system 3 to pass through;

[0055] When phase switching is required, the power receiving head 18 of the withstand voltage system 1 on the side of the device under test is connected to the phase under test by a test lead.

[0056] In this embodiment, the specific experimental process is as follows:

[0057] The through-type transition connection device is prefabricated in two parts in the factory. One end of the device is placed in the substation on site and connected to the equipment in the station that needs to withstand pressure.

[0058] Before use, first fix the withstand voltage system 1 at a predetermined position, insert the plug-in system 3 from the bottom of the withstand voltage system 1 into the inner insulating shell 12 and fix it, and connect the power receiving head 18 to the device to be tested. The plug-in system 3 at the other end of the through-type transition connection device can pass through various equipment, narrow walls, and narrow windows in the substation and then be fixed to the withstand voltage system 1. The power receiving head 18 at this end needs to be connected to the power supply equipment to transmit the test voltage to the device to be tested in the substation to complete the electrical test. If phase switching is required on site, only one end in the substation needs to be switched, and electrical tests are performed phase by phase (A, B, C) in sequence.

[0059] The through-type transition connection device of the present invention is specially designed to solve the electrical test in the substation with limited space. The device is prefabricated into two parts in the factory, quickly assembled on site, and one end is connected to the device to be tested in the station, which simplifies the traditional cumbersome test preparation process. Before use, fix the withstand voltage system 1, and then cleverly insert the plug-in system 3 from the bottom of the withstand voltage system 1 into the inner insulating shell 12 to ensure stability. The receiving head 18 is connected to the device to be tested to ensure the reliability of the electrical connection.

[0060] The plug-in system 3 of the through-type transition connection device can flexibly pass through various narrow spaces in the substation, such as narrow walls and narrow windows, and is fixed to the withstand voltage system 1, which greatly saves space. The receiving head 18 at this end is connected to the power supply equipment to achieve the safe transmission of the test voltage to the device under test and complete the electrical test. When phase change is required, it is only necessary to simply replace the connection at one end in the substation and perform electrical tests phase by phase in turn. The operation is simple and quick.

[0061] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A through-type transition connection device for electrical testing in a substation, used to connect power supply equipment and equipment to be tested in the substation respectively, characterized in that: The through-type transition connection device comprises a fully shielded pipeline (4), a plug-in system (3) and a pressure-resistant system (1); the number of the plug-in systems (3) is multiple and respectively connected to each end of the fully shielded pipeline (4); the number of the pressure-resistant systems (1) is multiple and corresponds to the plug-in systems (3) one by one; each pressure-resistant system (1) can be plugged in and connected to the corresponding plug-in system (3); insulating gas (2) is filled between the pressure-resistant system (1) and the plug-in system (3).

2. A through-type transition connection device for electrical testing in a substation according to claim 1, characterized in that: The plug-in system (3) comprises a push sleeve (31), a stress cone (32) and a guide rod contact (33) which are connected in sequence, and the wire core of the fully shielded pipeline (4) passes through the push sleeve (31) and the stress cone (32), and is electrically connected to the guide rod contact (33); The withstand voltage system (1) comprises a lower electrode (11), an inner insulating shell (12), an outer insulating shell (13), a voltage grading cover (14), a telescopic conductive rod (15), a connecting rod (16), an upper flange (17) and a power receiving head (18); the lower electrode (11) and the upper flange (17) are respectively connected to two ends of the outer insulating shell (13); the inner insulating shell (12), the voltage grading cover (14), the telescopic conductive rod (15) and the connecting rod (16) are all located on the inner side of the outer insulating shell (13); one end of the inner insulating shell (12) is connected to the lower electrode (11) and the other end is connected to the voltage grading cover (14); the voltage grading cover (14), the telescopic conductive rod (15), the connecting rod (16) and the power receiving head (18) are connected in sequence; the power receiving head (18) extends out of the outer insulating shell (13) through the upper flange (17) and is used to connect to a power supply device or a device to be tested; The pushing sleeve (31) is detachably connected to the inner insulating shell (12); the stress cone (32) and the guide rod contact (33) penetrate into the inner insulating shell (12); and the guide rod contact (33) is conductively connected to the telescopic conductive rod (15).

3. A through-type transition connection device for electrical testing in a substation according to claim 2, characterized in that: The inner insulating shell (12) is a cylindrical structure with a gradually contracting inner space; the end of the inner insulating shell (12) with a larger opening is connected to the lower electrode (11), and the end with a smaller opening is connected to the voltage equalizing cover (14); the size of the internal space of the inner insulating shell (12) matches the size of the stress cone (32).

4. A through-type transition connection device for electrical testing in a substation according to claim 1, characterized in that: The plug-in and pull-out system (3) and the fully shielded pipeline (4) are prefabricated into an integrated structure.

5. A through-type transition connection device for electrical testing in a substation according to claim 1, characterized in that: The number of the plug-in systems (3) is two, which are respectively connected to the two ends of the fully shielded pipeline (4); the number of the pressure-resistant systems (1) is two, which are respectively pluggable and connected to the corresponding plug-in systems (3).

6. A through-type transition connection device for electrical testing in a substation according to claim 1, characterized in that: The through-type transition connection device is used in electrical test scenarios within a substation with limited space.

7. A through-type transition connection device for electrical testing in a substation according to claim 6, characterized in that: The fully shielded pipeline (4) passes through obstacles in the substation and is connected to the equipment to be tested in the substation.

8. An operating method of a through-type transition connection device for electrical testing in a substation as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: Placing each withstand voltage system (1) at the location where the power supply equipment and the equipment to be tested in the substation are located; Inserting and connecting the plug-in system (3) at one end of the fully shielded pipeline (4) into the withstand voltage system (1) on the side of the device to be tested, and connecting the power receiving head (18) of the withstand voltage system (1) to the device to be tested; The plug-in system (3) at the other end of the fully shielded pipeline (4) passes through the obstacles of the substation, is inserted into and connected to the voltage-resistant system (1) on the power supply equipment side, and the power receiving head (18) of the voltage-resistant system (1) is connected to the power supply equipment.

9. The method according to claim 8, characterized in that The method further comprises: When phase switching is required, the power receiving head (18) of the withstand voltage system (1) on the side of the device to be tested is connected to the phase to be tested.

10. The method according to claim 8, characterized in that The barrier of the transformer substation is provided with through holes for the fully shielded pipeline (4) and the plug-in system (3) to pass through.

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