CN216560840U - Medium resistance type line selection structure for small current line selection device - Google Patents
Medium resistance type line selection structure for small current line selection device Download PDFInfo
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- CN216560840U CN216560840U CN202123307284.3U CN202123307284U CN216560840U CN 216560840 U CN216560840 U CN 216560840U CN 202123307284 U CN202123307284 U CN 202123307284U CN 216560840 U CN216560840 U CN 216560840U
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Abstract
The utility model discloses a medium resistance type line selection structure for a small current line selection device, which comprises a shell, wherein a power sampling unit, a medium resistance switching grounding unit and a line selection control unit are arranged in the shell; the power sampling unit comprises a sampling support, wherein current and voltage transformers are uniformly arranged on the sampling support, each current and voltage transformer comprises a closed iron core, a primary winding is wound on one side of the closed iron core, and a secondary winding and a tertiary winding are wound on the other side of the closed iron core; the utility model utilizes the middle resistor and the fling-cut switch to be connected with the neutral point of the power distribution network, and is used for carrying out temporary short circuit after a permanent earth fault occurs, and adopts zero sequence active power to carry out line selection; the power sampling unit is further designed, and the current-voltage transformer is specifically designed in the power sampling unit, so that the current and voltage sampling is convenient, and the structure is simple; the utility model further designs a vibration reduction structure for reducing vibration in the power sampling process, and ensures the stability and safety of the line selection equipment.
Description
Technical Field
The utility model relates to the technical field of small current line selection, in particular to a medium resistance type line selection structure for a small current line selection device.
Background
Fault line selection of a low-current grounding system is an important subject of a power distribution network, overvoltage generated by grounding fault easily causes insulation breakdown of a non-fault phase, and arc current for a long time can burn fault point insulation to cause two-phase short circuit fault; and if the line falls to the ground, personal safety accidents can be caused, so that the line with the ground fault can be quickly positioned and cleared, and the method has great significance for the safe operation of the power distribution network.
The zero sequence active power measurement and calculation in the traditional small current line selection technology is not ideal enough, so that the inventor provides a medium resistance type line selection structure for a small current line selection device by combining various factors.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that the zero sequence active power measurement and calculation in the traditional small current line selection technology is not ideal enough;
the utility model provides the following technical scheme:
a medium resistance type line selection structure for a small current line selection device comprises a shell, wherein a power sampling unit, a medium resistance switching grounding unit and a line selection control unit are arranged in the shell;
the power sampling unit comprises a sampling support, current and voltage transformers are uniformly arranged on the sampling support, each current and voltage transformer comprises a closed iron core, a primary winding is wound on one side of the closed iron core, a secondary winding and a tertiary winding are wound on the other side of the closed iron core, the primary winding is connected with a line to be selected, and the secondary winding and the tertiary winding output voltage and current respectively;
the middle resistor switching grounding unit comprises a middle resistor and a switching switch, wherein one end of the middle resistor is grounded through a lead, and the other end of the middle resistor is connected with the central point of the power distribution network through the switching switch;
a control box is arranged on the outer side of the shell, and the line selection control unit is installed in the control box;
as a further scheme of the utility model: the switching switch is an IGBT electronic switch module;
as a further scheme of the utility model: the sampling support is provided with a vibration reduction structure; the vibration reduction structure comprises an elastic damping rod, the elastic damping rod is connected to the sampling support, the bottom end of the elastic damping rod is sleeved in the damping cylinder and is fixedly connected with a spring arranged at the bottom of the damping cylinder, and damping fins are uniformly arranged on the elastic damping rod in the damping cylinder;
as a further scheme of the utility model: a control panel is arranged on the outer side of the control box and comprises a display screen and an operation panel, and the display screen and the operation panel are connected with the line selection control unit;
as a further scheme of the utility model: and an insulation plate is arranged on the sampling support corresponding to the current-voltage transformer, and threading holes are uniformly formed in the insulation plate.
As a further scheme of the utility model: the metal mesh is embedded in the middle of the insulating plate, and the electromagnetic shielding effect is achieved.
Compared with the prior art, the utility model has the following beneficial effects:
the utility model provides a medium resistance type line selection structure for a small current line selection device, which is ingenious in structural arrangement and reasonable in arrangement, wherein a medium resistance and a fling-cut switch are connected with a neutral point of a power distribution network and used for carrying out temporary short circuit after a permanent ground fault occurs, and zero sequence active power is adopted for line selection; the power sampling unit is further designed, and the current-voltage transformer is specifically designed in the power sampling unit, so that the current and voltage sampling is convenient, and the structure is simple; the utility model further designs a vibration reduction structure for reducing vibration in the power sampling process, and ensures the stability and safety of the line selection equipment.
Drawings
Fig. 1 is a schematic structural diagram of a medium resistance type line selection structure for a small current line selection device.
Fig. 2 is a schematic structural diagram of a power sampling unit in a medium resistance type line selection structure for a small current line selection device.
Fig. 3 is a schematic structural diagram of a current-voltage transformer in a medium resistance type line selection structure for a small current line selection device.
Fig. 4 is a schematic structural diagram of an insulating plate in a medium resistance type line selection structure for a low current line selection device.
Fig. 5 is a schematic structural diagram of a damping structure in a medium resistance type line selection structure for a small current line selection device.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1-5, a medium resistance type line selection structure for a small current line selection device includes a housing 1, a power sampling unit 2, a medium resistance switching grounding unit 3 and a line selection control unit 4 are disposed in the housing;
the power sampling unit 2 comprises a sampling support 21, current-voltage transformers 22 are uniformly installed on the sampling support 21, each current-voltage transformer 22 comprises a closed iron core 221, a primary winding 222 is wound on one side of each closed iron core 221, a secondary winding 223 and a tertiary winding 224 are wound on the other side of each closed iron core 221, the primary winding 222 is connected with a line to be selected, and the secondary winding 223 and the tertiary winding 224 respectively output voltage and current;
the middle resistor switching grounding unit 3 comprises a middle resistor 31 and a switching switch 32, wherein one end of the middle resistor 31 is grounded through a lead, and the other end of the middle resistor 31 is connected with the central point of the power distribution network through the switching switch 32;
a control box 5 is arranged on the outer side of the shell 1, and the line selection control unit 4 is installed in the control box 5;
the switching switch 32 is an IGBT electronic switch module;
the sampling support 21 is provided with a vibration reduction structure 6; the vibration reduction structure 6 comprises an elastic damping rod 61, the elastic damping rod 61 is connected to the sampling support 21, the bottom end of the elastic damping rod 61 is sleeved in a damping cylinder 62 and is fixedly connected with a spring 63 arranged at the bottom of the damping cylinder 62, and damping fins 64 are uniformly arranged on the elastic damping rod 61 in the damping cylinder 62;
a control panel 51 is arranged on the outer side of the control box 5, the control panel 51 comprises a display screen 511 and an operation panel 512, and the display screen 511 and the operation panel 512 are connected with the line selection control unit 4;
an insulating plate 7 is arranged on the sampling support 21 and between the corresponding current and voltage transformers 22, and threading holes 71 are uniformly formed in the insulating plate 7.
The metal mesh 72 is embedded in the middle of the insulating plate 7, and an electromagnetic shielding effect is achieved.
The working principle of the utility model is as follows: the utility model provides a medium resistance type line selection structure for a small current line selection device, which is ingenious in structural arrangement and reasonable in arrangement, wherein a medium resistance and a fling-cut switch are connected with a neutral point of a power distribution network and used for carrying out temporary short circuit after a permanent ground fault occurs, and zero sequence active power is adopted for line selection; the power sampling unit is further designed, and the current-voltage transformer is specifically designed in the power sampling unit, so that the current and voltage sampling is convenient, and the structure is simple; the utility model further designs a vibration reduction structure for reducing vibration in the power sampling process, and ensures the stability and safety of the line selection equipment.
Although the preferred embodiments of the present patent have been described in detail, the present patent is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present patent within the knowledge of those skilled in the art.
Claims (6)
1. A medium resistance type line selection structure for a low-current line selection device is characterized by comprising a shell, wherein a power sampling unit, a medium resistance switching grounding unit and a line selection control unit are arranged in the shell;
the power sampling unit comprises a sampling support, current and voltage transformers are uniformly arranged on the sampling support, each current and voltage transformer comprises a closed iron core, a primary winding is wound on one side of the closed iron core, a secondary winding and a tertiary winding are wound on the other side of the closed iron core, the primary winding is connected with a line to be selected, and the secondary winding and the tertiary winding output voltage and current respectively;
the middle resistor switching grounding unit comprises a middle resistor and a switching switch, wherein one end of the middle resistor is grounded through a lead, and the other end of the middle resistor is connected with the central point of the power distribution network through the switching switch;
the outer side of the shell is provided with a control box, and the line selection control unit is installed in the control box.
2. The medium resistance type line selection structure for the small current line selection device according to claim 1, wherein the switching switch is an IGBT electronic switch module.
3. The medium resistance type line selection structure for the small current line selection device according to claim 2, wherein a vibration reduction structure is arranged on the sampling support; the vibration reduction structure comprises an elastic damping rod, the elastic damping rod is connected to the sampling support, the bottom end of the elastic damping rod is sleeved in the damping cylinder and fixedly connected with a spring arranged at the bottom of the damping cylinder, and damping fins are uniformly arranged on the elastic damping rod in the damping cylinder.
4. The medium resistance type line selection structure for the small current line selection device according to claim 3, wherein a control panel is arranged outside the control box, the control panel comprises a display screen and an operation panel, and the display screen and the operation panel are connected with the line selection control unit.
5. The medium resistance type wire selection structure for the small current wire selection device according to claim 4, wherein an insulation board is arranged between the sampling support and the corresponding current-voltage transformer, and the insulation board is uniformly provided with wire through holes.
6. The medium resistance type wire selection structure for the small current wire selection device according to claim 5, wherein a metal mesh is embedded in the middle of the insulation board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123307284.3U CN216560840U (en) | 2021-12-27 | 2021-12-27 | Medium resistance type line selection structure for small current line selection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123307284.3U CN216560840U (en) | 2021-12-27 | 2021-12-27 | Medium resistance type line selection structure for small current line selection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216560840U true CN216560840U (en) | 2022-05-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123307284.3U Active CN216560840U (en) | 2021-12-27 | 2021-12-27 | Medium resistance type line selection structure for small current line selection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216560840U (en) |
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2021
- 2021-12-27 CN CN202123307284.3U patent/CN216560840U/en active Active
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