Isolator for isolating medium-voltage direct current

Abstract

The utility model discloses an isolator for isolating medium-voltage direct current. The isolator comprises an epoxy resin column body, a sealing cover, a wiring terminal, a connecting wire, a connecting assembly, a connecting plate and an isolating cylinder, the middle part of the epoxy resin cylinder is provided with an isolation cylinder, and two ends are respectively provided with a sealing cover. One end of a connecting assembly arranged at the upper end of the isolation cylinder is connected with the top surface of the isolation cylinder, and the other end extends outside the upper end of the epoxy resin cylinder; one end of a connecting assembly arranged at the lower end of the isolation cylinder is connected with the bottom surface of the isolation cylinder, and the other end extends outside the lower end of the epoxy resin cylinder; one end of the wiring terminal is connected with a connecting assembly arranged at the upper end of the isolation cylinder, and the other end is connected with one end of a connecting wire; one end of the connecting plate is connected with a connecting assembly arranged at the lower end of the isolation cylinder. According to the utility model, fault point positioning can be carried out without manually dismounting the grounding lead, so that the troubleshooting and positioning time is greatly shortened, and inconvenience and loss caused by power failure of a user are reduced.

Description

Technical Field

[0001] This utility model relates to the field of power detection auxiliary equipment technology, and in particular to an isolator for isolating medium-voltage DC power. Background Technology

[0002] With the continuous advancement of smart grid construction, medium-voltage lines occupy an important position in modern power systems. To improve power supply service quality, China Southern Power Grid Company has made a service commitment requiring rapid fault location and swift power restoration after a medium-voltage line outage. Currently, medium-voltage lines are equipped with numerous intelligent switches, testing instruments, and relay protection devices. These devices are powered through a three-phase five-limb voltage transformer with a neutral point grounded connection to ensure their normal operation. However, when a line experiences a fault outage, the traditional method for fault location and diagnosis involves using specialized equipment to connect cables and output approximately 10kV DC. Because the voltage transformer's neutral point is grounded, manually removing the grounding conductor is necessary for fault location and diagnosis, significantly delaying power restoration and failing to meet the requirement for rapid power restoration. Utility Model Content

[0003] The purpose of this invention is to provide an isolator for isolating medium-voltage DC power, which enables fault location without manual removal of the grounding wire, greatly shortening fault diagnosis and location time and reducing inconvenience and losses for users caused by power outages. The specific technical solution is as follows:

[0004] An isolator for isolating medium-voltage DC power includes an epoxy resin cylinder, a cover, terminals, connecting wires, connecting components, a connecting plate, and an isolation cylinder.

[0005] An isolation cylinder is installed in the middle of the epoxy resin column, and caps are installed at both ends. A connecting component located at the upper end of the isolation cylinder is connected to the top surface of the isolation cylinder at one end and extends to the outer side of the upper end of the epoxy resin column at the other end. A connecting component located at the lower end of the isolation cylinder is connected to the bottom surface of the isolation cylinder at one end and extends to the outer side of the lower end of the epoxy resin column at the other end. One end of the terminal block is connected to the connecting component located at the upper end of the isolation cylinder, and the other end is connected to one end of the connecting wire. The other end of the connecting wire extends outward. One end of the connecting plate is connected to the connecting component located at the lower end of the isolation cylinder, and the other end extends outward.

[0006] Preferably, the connecting assembly includes a sealing layer, a second nut, a third nut, a connecting stud, and a washer; the cover has a through hole in the middle; one end of the connecting stud is connected to the top or bottom surface of the isolation cylinder, and the other end extends outward through the through hole; the second nut, the third nut, and the washer are respectively installed on the end of the connecting stud that extends out of the cover.

[0007] Preferably, it also includes a sealing layer; a sealing layer is provided between the isolation cylinder and the cap.

[0008] Preferably, the outer peripheral surface of the epoxy resin column is provided with an external creeper.

[0009] Preferably, a first nut is provided at one end of the connecting plate extending outward.

[0010] Preferably, the external crawling distance is ≥210mm.

[0011] Preferably, the wiring terminal is an aluminum terminal of model DL16.

[0012] Preferably, the cap is a stainless steel cap.

[0013] Compared with the existing technology, the utility model has the following beneficial effects:

[0014] This invention isolates direct current through epoxy resin pillars and isolation cylinders, ensuring uninterrupted operation of intelligent switches, testing instruments, and relay protection devices in medium-voltage lines. This allows for rapid fault location, improving power system stability and reliability. After a power outage due to a medium-voltage line fault, fault location can be achieved without manually removing the grounding wire, significantly reducing troubleshooting and location time and minimizing inconvenience and losses for users. Furthermore, it avoids the tedious and dangerous manual removal of grounding wires, reducing operational risks and labor intensity for workers. Installation and use are convenient, improving work efficiency while ensuring worker safety. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly describes the drawings required for describing the embodiments. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure 2 This is a schematic diagram of the connecting component of this utility model.

[0018] Figure 3 This is a schematic diagram of the structure of the cap of this utility model.

[0019] Description of main reference numerals:

[0020] 1-Epoxy resin column, 2-Cap, 3-Terminal, 4-Connecting wire, 5-Connecting assembly, 6-Connecting plate, 7-First nut, 8-Sealing layer, 9-Outer creeper, 10-Second nut, 11-Third nut, 12-Connecting stud, 13-Washer, 14-Isolation cylinder, 15-Through hole. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "top", "bottom", "top surface", "bottom surface", "inside", "outside", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0023] In the description of this utility model, "several" means one or more, "more" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The terms "first," "second," and "third" are used solely for descriptive purposes and to distinguish technical features, and are not to be construed as indicating or implying relative importance, or implicitly specifying the number or order of the technical features indicated.

[0024] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," and "set" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium, or they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances. The following describes an embodiment of the present invention based on its overall structure.

[0025] Example 1

[0026] An isolator for isolating medium-voltage DC power, as shown in the figure, includes an epoxy resin cylinder, a cover, terminals, connecting wires, connecting components, a connecting plate, and an isolation cylinder.

[0027] An isolation cylinder is installed in the middle of the epoxy resin column, and caps are installed at both ends. A connecting component located at the upper end of the isolation cylinder is connected to the top surface of the isolation cylinder at one end and extends to the outer side of the upper end of the epoxy resin column at the other end. A connecting component located at the lower end of the isolation cylinder is connected to the bottom surface of the isolation cylinder at one end and extends to the outer side of the lower end of the epoxy resin column at the other end. One end of the terminal block is connected to the connecting component located at the upper end of the isolation cylinder, and the other end is connected to one end of the connecting wire. The other end of the connecting wire extends outward. One end of the connecting plate is connected to the connecting component located at the lower end of the isolation cylinder, and the other end extends outward.

[0028] Next, the working principle of this embodiment will be described in detail so that those skilled in the art can better understand this utility model:

[0029] This utility model is connected in series with the neutral point grounding wire of a three-phase five-limb voltage transformer. The cover serves a sealing function; the isolation cylinder is made of insulating material and serves an insulating function; one end of the connecting plate extending outward is fixed to the base of the three-phase five-limb voltage transformer, and the other end of the connecting wire extending outward is connected to the neutral point grounding wire of the three-phase five-limb voltage transformer. When using dedicated equipment to output DC power, the isolation cylinder can isolate the DC power, allowing workers to locate the fault point without manually removing the grounding wire, thus achieving rapid fault location.

[0030] Example 2

[0031] The difference between this embodiment and Embodiment 1 is that the connecting assembly includes a sealing layer, a second nut, a third nut, a connecting stud, and a washer; a through hole is opened in the middle of the cover; one end of the connecting stud is connected to the top or bottom surface of the isolation cylinder, and the other end extends outward through the through hole; the second nut, the third nut, and the washer are respectively installed on the end of the connecting stud that extends out of the cover.

[0032] The connecting stud serves to connect the three-phase five-limb voltage transformer and the isolation cylinder. The second nut, third nut, and washer are used to fix the terminal block or connecting plate. When fixing the terminal block, the terminal block is fitted onto the connecting stud, with a washer on the bottom surface of the terminal block, a second nut on the bottom surface of the washer, and a third nut on the top surface of the washer. When fixing the connecting plate, threaded holes are opened at both ends of the connecting plate. One end of the connecting plate is fitted onto the connecting stud, with a third nut on the top surface of the connecting stud, a washer on the bottom surface of the connecting stud, and a second nut on the bottom surface of the washer.

[0033] The working principle of this embodiment is the same as that of Embodiment 1.

[0034] Example 3

[0035] The difference between this embodiment and Embodiment 2 is that it also includes a sealing layer; a sealing layer is provided between the isolating cylinder and the cap. The sealing layer is a potting compound, which enhances the sealing performance of the isolator, prevents moisture, dust and other impurities from entering, and improves the reliability and service life of the isolator.

[0036] This further improves the insulation performance of the isolation cylinder, ensuring effective isolation of direct current.

[0037] The working principle of this embodiment is the same as that of Embodiment 1.

[0038] Example 4

[0039] The difference between this embodiment and Embodiment 3 is that the outer peripheral surface of the epoxy resin column is provided with an external creeper. The external creeper structure increases the surface area of ​​the epoxy resin column, improves heat dissipation performance, reduces the temperature of the isolator during operation, and improves its stability and reliability.

[0040] The working principle of this embodiment is the same as that of Embodiment 1.

[0041] Example 5

[0042] The difference between this embodiment and embodiment 4 is that a first nut is provided at one end of the connecting plate extending outward. The connecting plate is connected to the base of the three-phase five-limb voltage transformer by bolts and the first nut. This connection method is more convenient for disassembly and assembly, and improves the maintenance efficiency of the staff.

[0043] The working principle of this embodiment is the same as that of Embodiment 1.

[0044] Example 6

[0045] The difference between this embodiment and Embodiment 5 is that the external creepage distance is ≥210mm. An external creepage distance ≥210mm can improve the insulation performance of the device, ensure insulation effectiveness, reduce interference from external factors on fault location, and also enhance the safety of the device, reducing the risk of accidents.

[0046] The working principle of this embodiment is the same as that of Embodiment 1.

[0047] Example 7

[0048] The difference between this embodiment and embodiment 6 is that the wiring terminal is an aluminum terminal of model DL16.

[0049] The terminal block is a DL16 aluminum terminal block, which has good conductivity and mechanical strength, ensuring the reliability of the connection, facilitating connection with other equipment, and improving the versatility of the device.

[0050] The working principle of this embodiment is the same as that of Embodiment 1.

[0051] Example 8

[0052] The difference between this embodiment and embodiment 7 is that the cap is a stainless steel cap.

[0053] The cover is a stainless steel cover, which has good sealing and electrical properties, is more durable, and improves the overall performance of the device.

[0054] The working principle of this embodiment is the same as that of Embodiment 1.

[0055] In summary, this utility model isolates DC current by using epoxy resin pillars and isolation cylinders, ensuring the normal operation of intelligent switches, testing instruments, and relay protection devices in medium-voltage lines. This allows for rapid fault location and improves the stability and reliability of the power system. After a power outage due to a medium-voltage line fault, fault location can be achieved without manually removing the grounding wire, significantly shortening fault diagnosis and location time and reducing inconvenience and losses for users. Furthermore, it avoids the tedious and dangerous operation of manually removing the grounding wire, reducing operational risks and labor intensity for workers. It is easy to install and use, improving work efficiency while ensuring worker safety.

[0056] The foregoing descriptions of specific exemplary embodiments of the present invention are for the purpose of illustration and description. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is obvious that many changes and variations can be made based on the above teachings. Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not limitations on the present invention. The specific features, structures, materials or characteristics described can be combined in an appropriate manner in any one or more embodiments or examples. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can make modifications, substitutions, variations and various different choices and changes to the embodiments without creative contribution as needed after reading this specification without departing from the principles and purpose of the present invention, but as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. An isolator for isolating medium-voltage direct current, characterized in that, Includes epoxy resin cylinder, cap, terminal block, connecting wire, connecting assembly, connecting plate and isolation cylinder; An isolation cylinder is installed in the middle of the epoxy resin column, and caps are installed at both ends. A connecting component located at the upper end of the isolation cylinder is connected to the top surface of the isolation cylinder at one end and extends to the outer side of the upper end of the epoxy resin column at the other end. A connecting component located at the lower end of the isolation cylinder is connected to the bottom surface of the isolation cylinder at one end and extends to the outer side of the lower end of the epoxy resin column at the other end. One end of the terminal block is connected to the connecting component located at the upper end of the isolation cylinder, and the other end is connected to one end of the connecting wire. The other end of the connecting wire extends outward. One end of the connecting plate is connected to the connecting component located at the lower end of the isolation cylinder, and the other end extends outward.

2. An isolator for isolating medium-voltage DC power according to claim 1, characterized in that, The connecting assembly includes a sealing layer, a second nut, a third nut, a connecting stud, and a washer; the cover has a through hole in the middle; one end of the connecting stud is connected to the top or bottom surface of the isolation cylinder, and the other end extends outward through the through hole; the second nut, the third nut, and the washer are respectively installed on the end of the connecting stud that extends out of the cover.

3. An isolator for isolating medium-voltage DC power according to claim 1, characterized in that, It also includes a sealing layer; a sealing layer is provided between the isolation cylinder and the cap.

4. An isolator for isolating medium-voltage DC power according to claim 1, characterized in that, The outer peripheral surface of the epoxy resin column is provided with an external creeper.

5. An isolator for isolating medium-voltage DC power according to claim 1, characterized in that, A first nut is provided at one end of the connecting plate that extends outward.

6. An isolator for isolating medium-voltage DC power according to claim 4, characterized in that, The external crawling distance is ≥210mm.

7. An isolator for isolating medium-voltage DC power according to claim 1, characterized in that, The terminal block is an aluminum terminal block of model DL16.

8. An isolator for isolating medium-voltage DC power according to claim 1, characterized in that, The cap is a stainless steel cap.

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