CN210294458U - Equivalent test model for main insulation of head of current transformer - Google Patents
Equivalent test model for main insulation of head of current transformer Download PDFInfo
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- CN210294458U CN210294458U CN201920977554.5U CN201920977554U CN210294458U CN 210294458 U CN210294458 U CN 210294458U CN 201920977554 U CN201920977554 U CN 201920977554U CN 210294458 U CN210294458 U CN 210294458U
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Abstract
The utility model discloses an equivalent test model of current transformer head owner insulation. Because the current transformer body is inconvenient to carry out the insulating properties test, lacks effectual equivalent test model at present. The utility model comprises a test cavity, a fixed base, a high-voltage outlet terminal, a grounding terminal, a test upper electrode, a test lower electrode, a fixed bracket, a connecting screw rod, a fixed nut and transformer oil, wherein the transformer oil is contained in the test cavity; the fixed base is fixed on the bottom surface of the test cavity; the side wall of the test cavity is respectively embedded into a high-voltage outlet terminal and a grounding terminal; the test upper electrode is led out to a high-voltage wire outlet end through a connecting screw rod through a high-voltage lead; the test lower electrode is connected with a grounding end through a lead; the test upper electrode is stacked on the test lower electrode. The utility model discloses an establish current transformer head main insulation equivalent test model, be convenient for carry out the current transformer insulation degradation performance test.
Description
Technical Field
The utility model relates to a current transformer's insulating properties test device, especially a current transformer head main insulation's equivalent test model for carrying out current transformer insulation degradation performance test.
Background
The current transformer is one of important electrical equipment in a power grid, is easy to be influenced by lightning overvoltage and operation overvoltage in the actual operation process, and the insulation performance of the main insulation of the head part of the current transformer is obviously degraded under the action of multiple impact voltages, so that the current transformer is damaged, the protection misoperation and equipment tripping of a circuit where the current transformer is located can be caused, and the safety accident of the power grid is caused, and therefore, the insulation degradation performance of the current transformer needs to be known.
Because the current transformer body is inconvenient to carry out the insulation performance test, an effective equivalent test model is lacked at present, and the insulation degradation performance of the current transformer is difficult to evaluate.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that overcome the defect that above-mentioned prior art exists, provide a current transformer head main insulation's equivalent test model to it is experimental to carry out current transformer insulation degradation performance, thereby can assess current transformer insulation degradation performance.
Therefore, the utility model adopts the following technical scheme: an equivalent test model of main insulation of a head of a current transformer comprises a test cavity, a fixed base, a high-voltage outlet end, a grounding end, an upper test electrode, a lower test electrode, a fixed support, a connecting screw rod, a fixed nut and transformer oil, wherein the transformer oil is contained in the test cavity;
the fixed base is fixed on the bottom surface of the test cavity;
the side wall of the test cavity is respectively embedded into a high-voltage outlet terminal and a grounding terminal;
the test upper electrode is led out to a high-voltage wire outlet end through a connecting screw rod through a high-voltage lead;
the test lower electrode is connected with a grounding end through a lead;
the test upper electrode is stacked on the test lower electrode.
Furthermore, the high-voltage lead is fixed on the connecting screw rod through a fixing nut.
Further, the test upper electrode and the test lower electrode are concentric.
Furthermore, the connecting screw rod is limited and fixed by a fixing support.
Furthermore, the test lower electrode is connected with the fixed base through the fixed support.
Furthermore, the bottom surface of the test cavity is adhered to the fixed base.
Furthermore, the material of the test cavity and the material of the fixed base are both transparent organic glass.
Further, during the test, a sample is placed between the test upper electrode and the test lower electrode.
Further, the test piece is a multi-layer stacked insulating paper, and is immersed in the transformer oil.
Furthermore, the upper electrode and the lower electrode are both columnar electrodes and are made of stainless steel.
The utility model discloses an establish current transformer head main insulation equivalent test model, be convenient for carry out the current transformer insulation degradation performance test, can adopt impulse voltage's cumulative effect to simulate insulating degradation degree during the experiment to combineU-NThe characteristic curve represents the degradation degree of the insulation, so that the degradation performance of the main insulation of the head of the current transformer can be better reflected.
Drawings
Fig. 1 is the structure schematic diagram of the equivalent test model of the main insulation of the head of the current transformer.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of 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.
Fig. 1 is the utility model discloses a current transformer head main insulation equivalent test model's schematic structure diagram. The equivalent test model comprises a test cavity 1, a fixed base 2, a high-voltage outlet terminal 3, a grounding terminal 4, a test upper electrode 5, a test lower electrode 6, a fixed support 7, a connecting screw rod 8, a fixed nut 9 and transformer oil 11, wherein the transformer oil 11 is contained in the test cavity 1.
The bottom surface of the test cavity 1 is adhered to the fixed base 2 and used for fixing and insulating and supporting the test lower electrode 6 and the fixed support 7.
The test cavity 1 and the fixed base 2 are made of transparent organic glass, so that the test phenomenon can be observed conveniently, the sample can be replaced in the transformer oil 11 conveniently, and the side wall of the test cavity 1 is embedded into the high-voltage outlet terminal 3 and the grounding terminal 4 respectively and is connected with the high-voltage lead and the ground wire of the external test loop respectively.
The upper electrode 5 is led out to the high-voltage lead end 3 through the connecting screw rod 8 through the high-voltage lead, and the high-voltage lead is fixed on the connecting screw rod 8 through the fixing nut 9, so that the sample is convenient to replace, and the upper electrode is easy to disassemble, assemble and clean in the test.
The test lower electrode 6 is connected with the fixed base 2 through the fixed support 7 and is connected with the grounding end 4 through a lead, so that the test lower electrode is convenient to disassemble, assemble and clean.
The upper test electrode 5 and the lower test electrode 6 are both columnar electrodes made of stainless steel, and the electric field born by the current transformer can be better simulated by adopting a column-column electrode form in consideration of the fact that the main insulation local electric field of the head of the current transformer is relatively uniform.
The test upper electrode is superposed on the test lower electrode, and the test upper electrode is concentric with the test lower electrode.
Connecting screw 8 is spacing fixed by fixed bolster 7, ensures that experimental upper electrode and experimental lower electrode are concentric, and the electrode position can not change in the experiment simultaneously in the process of the test, ensures experimental accuracy.
In the test, a test piece is placed between the test upper electrode and the test lower electrode, and the test piece 10 is a multi-layer stacked insulating paper and is immersed in the transformer oil 11.
The main insulation structure in the middle of the two layers of capacitive screens at the head of the current transformer is a multi-layer insulation paper wrapping structure, the oil gap of the transformer is small, the main insulation structure at the head of the current transformer can be well simulated by adopting a multi-layer insulation paper stacking mode, meanwhile, before the test, the insulation paper and the transformer need to be subjected to vacuum heating treatment under the conditions of 70 ℃ and-0.9 bar respectively, the insulation paper is subjected to vacuum oil immersion treatment under the condition of-0.9 bar, the influence of moisture and bubbles in the insulation paper and the transformer oil on the test result is eliminated, and the upper electrode of the transformer oil completely immersed in the test is ensured during the test so as to ensure the uniformity of an electric field.
Although the present invention has been described in terms of embodiments, those of ordinary skill in the art will recognize that there are numerous variations and modifications of the present invention without departing from the spirit of the invention, and it is intended that the appended claims encompass such variations and modifications without departing from the spirit of the invention.
Claims (10)
1. An equivalent test model of main insulation of a head of a current transformer is characterized by comprising a test cavity (1), a fixed base (2), a high-voltage outlet terminal (3), a grounding terminal (4), a test upper electrode (5), a test lower electrode (6), a fixed support (7), a connecting screw rod (8), a fixed nut (9) and transformer oil (11), wherein the transformer oil (11) is contained in the test cavity (1);
the fixed base (2) is fixed on the bottom surface of the test cavity (1);
the side wall of the test cavity (1) is respectively embedded with a high-voltage outlet terminal (3) and a grounding terminal (4);
the test upper electrode (5) is led out to a high-voltage lead end (3) through a connecting screw (8) through a high-voltage lead;
the test lower electrode (6) is connected with a grounding end (4) through a lead;
the test upper electrode (5) is superposed on the test lower electrode (6).
2. Equivalent test model of main insulation of head of current transformer according to claim 1, characterized in that the high voltage lead is fixed on the connection screw (8) by a fixing nut (9).
3. The equivalent test model of the main insulation of the header of the current transformer as claimed in claim 2, wherein said upper test electrode is concentric with said lower test electrode.
4. Equivalent test model of main head insulation of a current transformer according to claim 3, characterized in that the connecting screw (8) is fixed by a fixing bracket (7) in a limiting way.
5. Equivalent test model of main insulation of current transformer head according to claim 3, characterized in that the test lower electrode (6) is connected to the fixed base (2) through a fixed bracket (7).
6. The equivalent test model of the main insulation of the head of the current transformer according to any one of claims 1 to 5, characterized in that the bottom surface of the test cavity (1) is adhered to the fixed base (2).
7. Equivalent test model of main head insulation of current transformer according to any of claims 1-5, characterized in that the test chamber (1) and the fixed base (2) are made of transparent organic glass.
8. Equivalent test model of the main insulation of the header of a current transformer according to any of claims 1 to 5,
in the test, a sample (10) is placed between the test upper electrode (5) and the test lower electrode (6).
9. Equivalent test model of the main insulation of the header of a current transformer according to claim 8, characterized in that said specimen
(10) Is a multi-layer stacked insulating paper, and is immersed in transformer oil (11).
10. Equivalent test model of the main insulation of the header of a current transformer according to any of claims 1 to 5,
the test upper electrode (5) and the test lower electrode (6) are both columnar electrodes and are made of stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920977554.5U CN210294458U (en) | 2019-06-26 | 2019-06-26 | Equivalent test model for main insulation of head of current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920977554.5U CN210294458U (en) | 2019-06-26 | 2019-06-26 | Equivalent test model for main insulation of head of current transformer |
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| Publication Number | Publication Date |
|---|---|
| CN210294458U true CN210294458U (en) | 2020-04-10 |
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| CN201920977554.5U Active CN210294458U (en) | 2019-06-26 | 2019-06-26 | Equivalent test model for main insulation of head of current transformer |
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| CN (1) | CN210294458U (en) |
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2019
- 2019-06-26 CN CN201920977554.5U patent/CN210294458U/en active Active
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