CN213877756U - End screen protection grounding less-oil inverted current transformer - Google Patents
End screen protection grounding less-oil inverted current transformer Download PDFInfo
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- CN213877756U CN213877756U CN202120028335.XU CN202120028335U CN213877756U CN 213877756 U CN213877756 U CN 213877756U CN 202120028335 U CN202120028335 U CN 202120028335U CN 213877756 U CN213877756 U CN 213877756U
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Abstract
The utility model discloses a little oil inverted current transformer of end screen protection grounding, which comprises a base connecting body and a secondary lead pipe sleeved in the base connecting body, wherein an insulating sleeve is arranged between the secondary lead pipe and the base connecting body; one end of the end screen lead is connected with the secondary lead tube, the other end of the end screen lead is connected with a copper bolt arranged on the secondary plate, the other end of the copper bolt is detachably connected with a grounding nut, one end of a grounding wire is connected with the grounding nut, and the other end of the grounding wire is connected with the base connector, so that the electrical conduction of the secondary lead tube and the base connector is realized. Because the grounding nut is connected with the grounding wire and the end screen lead, the on-off of the grounding nut and the end screen lead can be changed by changing the connection position of the grounding nut, so that the change of the grounding or insulation state of the secondary lead tube is realized, and the dielectric loss and capacitance test of the device after operation is realized.
Description
Technical Field
The utility model relates to a current transformer technical field, more specifically say, relate to a few oily inversion formula current transformer of end screen protection ground connection.
Background
At present, a 35kV-750kV oil-less inverted current transformer is directly grounded mainly by installing a secondary lead tube on a base connector, and is reliable in grounding and convenient to install. However, the current transformer can be subjected to dielectric loss and capacitance tests only under the condition that the base is insulated from the ground.
After the current transformer is installed and operated, because the base is installed and grounded, the dielectric loss and capacitance test cannot be carried out in the periodic preventive test or the temporary test. During long-term operation of equipment, the problem of reduction of the insulation performance of transformer oil is likely to occur along with medium aging caused by high temperature, so that internal faults of the equipment are caused, and potential safety hazards of a power grid are caused.
In summary, how to implement the dielectric loss and capacitance test of the device after operation is an urgent problem to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a few oily inversion current transformer of end screen protection ground connection can realize equipment dielectric loss and capacitance test after the operation.
In order to achieve the above object, the present invention provides the following technical solutions:
a little oil inversion type current transformer of end screen protection grounding comprises a base connector and a secondary lead tube sleeved in the base connector, wherein an insulating sleeve is arranged between the secondary lead tube and the base connector;
one end of the end screen lead is connected with the secondary lead pipe, the other end of the end screen lead is connected with a copper bolt installed on the secondary plate, the other end of the copper bolt is detachably connected with a grounding nut, one end of a grounding wire is connected with the grounding nut, the other end of the grounding wire is connected with the base connector, and therefore the secondary lead pipe is electrically conducted with the base connector.
Preferably, two ends of the end screen lead are connected through a grounding screw.
Preferably, the secondary lead tube is sleeved with a fixing clamp used for connecting the secondary lead tube and the base connecting body, and the fixing clamp is provided with a first threaded hole for installing the grounding screw.
Preferably, both ends of the grounding wire are connected by the grounding screw.
Preferably, one end of the grounding wire, which is far away from the copper bolt, is connected with a base wire outlet box, and a third threaded hole for mounting the grounding screw is formed in the base wire outlet box.
Preferably, both ends of the copper bolt are provided with second threaded holes for installing the grounding screws.
Preferably, the screener lead comprises a copper core insulated wire.
Preferably, the ground wire comprises a copper core insulated wire.
The utility model provides a little oil inversion type current transformer of end screen protection grounding, which comprises a base connecting body and a secondary lead pipe sleeved in the base connecting body, wherein an insulating sleeve is arranged between the secondary lead pipe and the base connecting body; one end of the end screen lead is connected with the secondary lead tube, the other end of the end screen lead is connected with a copper bolt arranged on the secondary plate, the other end of the copper bolt is detachably connected with a grounding nut, one end of a grounding wire is connected with the grounding nut, and the other end of the grounding wire is connected with the base connector, so that the electrical conduction of the secondary lead tube and the base connector is realized.
When the secondary lead tube works normally, the secondary lead tube is connected with the base connector through the end screen lead, the copper bolt, the grounding nut and the grounding wire, and the base connector is grounded, so that the grounding of the secondary lead tube is realized.
When dielectric loss and capacitance test need be carried out, twist off the ground nut from the copper bolt, then end screen lead wire and earth connection disconnection, end screen lead wire no longer ground connection, be equipped with the insulating bush of separating the two simultaneously between secondary lead tube and the base connector, consequently realized that secondary lead tube is insulating with the ground, accessible test instrument accessible is connected with the copper screw and is acquireed test signal.
Therefore, the grounding nut is used for connecting the grounding wire and the end screen lead, the connection position of the grounding nut is changed to change the on-off state of the grounding wire and the end screen lead, the change of the grounding or insulating state of the secondary lead tube is further realized, and the dielectric loss and capacitance test of the device after operation is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of a current transformer with a low oil level inversion type grounded end shield according to the present invention;
fig. 2 is a schematic structural diagram of the oil-less inverted current transformer with grounded end screen protection in fig. 1 in a test state.
In fig. 1-2:
1 is a secondary lead tube, 2 is a fixing clamp, 3 is an insulating sleeve, 4 is a base connector, 5 is a tail screen lead, 6 is a copper bolt, 7 is a secondary plate, 8 is a grounding nut, 9 is a grounding wire, 10 is a base outlet box, and 11 is a grounding screw.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The core of the utility model is to provide a few oily inversion formula current transformer of end screen protection ground connection, can realize equipment dielectric loss and capacitance test after the commissioning.
Referring to fig. 1-2, fig. 1 is a schematic structural diagram of an embodiment of a tail-shield grounded oil-less inverted current transformer according to the present invention; fig. 2 is a schematic structural diagram of the oil-less inverted current transformer with grounded end screen protection in fig. 1 in a test state.
The utility model provides a less-oil inverted current transformer, which comprises a base connector 4 and a secondary lead tube 2 sleeved in the base connector 4, wherein an insulating sleeve 3 is arranged between the secondary lead tube 2 and the base connector 1; one end of the end screen lead 5 is connected with the secondary lead tube 1, the other end is connected with a copper bolt 6 arranged on the secondary plate 7, the other end of the copper bolt 6 is detachably connected with a grounding nut 8, one end of a grounding wire 9 is connected with the grounding nut 8, and the other end is connected with the base connector 4, so that the electrical conduction of the secondary lead tube 2 and the base connector 4 is realized.
Referring to fig. 1 and 2, a secondary lead tube 1 is sleeved in a base connector 4, and the two are connected by a fixing clip 2. In order to realize the insulation between the secondary lead tube 1 and the base connector 4, the insulating sleeve 3 may be a cylindrical hole having a positioning step at an end thereof, the length of the cylindrical hole is the same as that of the secondary lead tube mounting hole of the base connector 3, and the diameter of the positioning step is the same as the outer diameter of the secondary lead tube 1.
The insulating sleeve 3 is made of insulating materials such as epoxy resin and the like, and the axial and circumferential positioning of the insulating sleeve 4 and the secondary lead mounting hole of the base connecting body 4 is realized through the positioning step.
The end screen lead 5 connects the copper bolt 6 and the secondary lead tube 1, so that the current at the secondary lead tube 1 can be conducted to the copper bolt 6.
Preferably, the two ends of the end screen lead 5 are connected through the grounding screws 11, so that the connection is simple and convenient, and the installation is convenient.
Preferably, the secondary lead tube 1 is sleeved with a fixing clamp 2 for connecting the secondary lead tube 1 and the base connecting body 4, and the fixing clamp 2 is provided with a first threaded hole for installing the grounding screw 11. Secondary lead tube 1 switches on with copper bolt 6 electricity through fixation clamp 2 to set up the screw hole and disturb its normal work on secondary lead tube 1.
One end of the grounding wire 9 is connected with the grounding nut 8, and the other end is connected with the base connector 4, so that the electrical conduction between the grounding nut 8 and the base connector 4 is realized, and the base connector 4 is grounded, so that the grounding wire 9 always keeps a grounding state, namely the grounding nut 8 connected with the grounding wire 9 always keeps a grounding state.
Preferably, the two ends of the grounding wire 9 can be connected by the grounding screw 11, and the connection is simple and convenient for installation.
Preferably, one end of the grounding wire 9 far away from the copper bolt 6 is connected with a base outlet box 10, and the base outlet box 10 is provided with a third threaded hole for installing a grounding screw 11.
Because the base outlet box 10 is connected with the base connector 4, the base outlet box 10 is in a grounding state as the base connector 4, the length of the grounding wire 9 is effectively shortened by connecting the grounding wire 9 with the base outlet box 10, and the circuit layout in the current transformer is simplified.
One end of the copper bolt 6 is communicated with the end screen lead 5 through a grounding screw 11, and the other end of the copper bolt is communicated with a grounding wire 9 through a grounding nut 8, so that when the copper bolt 6 is connected with the grounding nut 8, the end screen lead 5 is grounded; when the copper bolt 6 is disconnected from the grounding nut 8, the end screen lead 5 is insulated from the ground.
Preferably, both ends of the copper bolt 6 are provided with second threaded holes for mounting the grounding screws 11.
When the secondary lead tube works normally, the secondary lead tube 1 is connected with the base connector 4 through the end screen lead 5, the copper bolt 6, the grounding nut 8 and the grounding wire 9, and the base connector 4 is grounded, so that the grounding of the secondary lead tube 1 is realized.
When dielectric loss and capacitance test need be carried out, unscrewing ground nut 8 from copper bolt 6, then end screen lead 5 and earth connection 9 disconnection, end screen lead 5 no longer ground connection, be equipped with the insulating bush 3 of separating the two simultaneously between secondary lead tube 1 and the base connector 4, consequently realized that secondary lead tube 1 is insulating with the ground, accessible test instrument accessible and copper screw 6 are connected and are acquireed test signal.
In this embodiment, the grounding nut 8 is used to connect the grounding wire 9 and the end screen lead 5, and the connection position of the grounding nut 8 is changed to change the on-off state of the grounding wire and the end screen lead, so that the change of the grounding or insulation state of the secondary lead tube 1 is realized, and the dielectric loss and capacitance test of the device after operation is realized.
Preferably, the end screen lead 5 may comprise a copper core insulated wire, the specification of which is determined by reference to the prior art according to the requirements in actual production.
Preferably, the ground wire 9 may comprise a copper core insulated wire, the specification of which is determined by reference to the prior art according to the actual production requirements.
It should be noted that, in the present document, the first, second and third threaded holes among the first, second and third threaded holes are only used for distinguishing the difference of the positions, and do not distinguish the sequence.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
It is right above the utility model provides a few oily inversion formula current transformer of end screen protection ground connection has carried out the detailed introduction. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.
Claims (8)
1. A little oil inversion type current transformer of end screen protection grounding comprises a base connector (4) and a secondary lead tube (1) sleeved in the base connector (4), and is characterized in that an insulating sleeve (3) is arranged between the secondary lead tube (1) and the base connector (4);
the one end of end screen lead wire (5) with secondary lead wire pipe (1) is connected, the other end is connected with copper bolt (6) of installing in secondary plate (7), the other end and ground nut (8) of copper bolt (6) can be dismantled and be connected, the one end of earth connection (9) with ground nut (8) are connected, the other end with base connector (4) are connected, so that realize secondary lead wire pipe (1) with the electrical conduction of base connector (4).
2. The end-screen protection grounded oil-less inverted current transformer according to claim 1, wherein two ends of the end-screen lead (5) are connected through a grounding screw (11).
3. The end-screen protection grounded less-oil inverted current transformer according to claim 2, wherein a fixing clamp (2) for connecting the secondary lead tube (1) and the base connecting body (4) is sleeved on the secondary lead tube (1), and the fixing clamp (2) is provided with a first threaded hole for installing the grounding screw (11).
4. The end-screen protection grounded less-oil inverted current transformer according to claim 3, characterized in that both ends of the grounding wire (9) are connected by the grounding screw (11).
5. The end-screen protection grounded less-oil inverted current transformer according to claim 4, wherein one end of the grounding wire (9) far away from the copper bolt (6) is connected with a base outlet box (10), and a third threaded hole for mounting the grounding screw (11) is formed in the base outlet box (10).
6. The end-screen protection grounded less-oil inverted current transformer according to claim 4, wherein both ends of the copper bolt (6) are provided with second threaded holes for mounting the grounding screws (11).
7. End screen protection grounded less oil inverted current transformer according to any of claims 1-6, characterized in that the end screen lead (5) comprises a copper core insulated wire.
8. End screen protection grounded current transformer with less oil left over according to any of claims 1-6, characterized in that the earth wire (9) comprises a copper core insulated wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120028335.XU CN213877756U (en) | 2021-01-06 | 2021-01-06 | End screen protection grounding less-oil inverted current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120028335.XU CN213877756U (en) | 2021-01-06 | 2021-01-06 | End screen protection grounding less-oil inverted current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213877756U true CN213877756U (en) | 2021-08-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120028335.XU Active CN213877756U (en) | 2021-01-06 | 2021-01-06 | End screen protection grounding less-oil inverted current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213877756U (en) |
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2021
- 2021-01-06 CN CN202120028335.XU patent/CN213877756U/en active Active
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