High-voltage current transformer adopting dynamic seal
By adopting a dynamic seal design in the high-voltage current transformer, the dynamic sealing of the conductive rod is achieved by using a sliding seal sleeve and a V-shaped sealing ring, the deformation stress and gas leakage of the conductive rod and the high-voltage shell are solved, and the safety performance is improved.
Patent Information
- Application Number
- CN202421222415.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-31
- Publication Date
- 2025-03-14
- Estimated Expiration
- 2034-05-31
AI Technical Summary
The conductive rods of existing high-voltage current transformers are fixedly connected to the high-voltage shell, resulting in an increase in the internal air pressure and thermal expansion of the conductive rod, causing the risk of expansion and deformation of the high-voltage shell and gas leakage, affecting the safety of use.
Adopting a dynamic sealing design, one end of the high-voltage conductive rod is fixedly connected to the high-voltage shell through the sealing flange seat, and the other end is slidingly connected through the sliding seal sleeve. Dynamic sealing is achieved using the sliding seal sleeve and the V-shaped seal ring, allowing the conductive rod to telescope when the air pressure changes and thermal expansion.
It effectively eliminates the deformation stress of the conductive rod and high-pressure shell, reduces the risk of gas leakage, and improves the safety performance of use.
Smart Images
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Abstract
Description
Technical Field
[0001] The utility model relates to a current transformer, in particular to a high-voltage current transformer adopting a dynamic seal. Background Art
[0002] In the existing high-voltage housing of the current transformer, the interior is filled with insulating gas, and the conductive rod through which the built-in secondary coil is connected is fixedly connected to the high-voltage housing. When the current passes through the internal coil and the conductive rod, heat is generated. Since the two ends of the conductive rod are connected to the two ends of the high-voltage housing, the internal gas pressure increases and the conductive rod expands thermally. The conductive rod expands and contracts, causing the high-voltage housing to expand and deform, resulting in the risk of gas leakage, which affects the safety of use. Summary of the invention
[0003] The utility model provides a high-voltage current transformer with dynamic sealing which has a simple structure, can effectively eliminate the deformation stress of a conductive rod and a high-voltage shell, and improves the safety of use.
[0004] The technical solution adopted by the utility model is: a high-voltage current transformer adopting dynamic sealing, comprising a high-voltage shell, the high-voltage shell is filled with insulating gas, a secondary coil is arranged in the high-voltage shell, and the secondary coil is passed through a high-voltage conductive rod, and its characteristics are: the high-voltage conductive rod is a low-resistance aluminum tube, one end of the high-voltage conductive rod is connected to the high-voltage shell through a sealing flange seat, and the other end of the high-voltage conductive rod is connected to the high-voltage shell through a sliding sealing sleeve.
[0005] The sliding sealing sleeve is arranged in a flange hole welded on the side wall of the high-pressure housing.
[0006] The sliding sealing sleeve is made of nylon or polytetrafluoroethylene.
[0007] The two ends of the high-voltage conductive rod passing through the high-voltage housing are connected to the high-voltage wiring board, and the high-voltage wiring board is made of forged aluminum alloy.
[0008] The surface roughness of the high-voltage conductive rod at the sliding position is Ra3.2, and this roughness can maintain good sealing with the sealing ring during the sliding process.
[0009] The sealing ring of the sliding sealing sleeve is made of nitrile silicone rubber, and its cross section adopts a "V"-shaped structure.
[0010] The number of the sealing rings is 3-5, and the number can be increased or decreased according to the pressure of the gas in the high-pressure shell.
[0011] By adopting the above technical solution, the beneficial effects of the utility model are:
[0012] 1. Low-resistance aluminum tube is used as high-voltage conductive rod, which has strong current carrying capacity;
[0013] 2. The high-voltage terminal board is made of forged aluminum alloy instead of copper alloy, eliminating the electrochemical corrosion caused by the transition between the copper and aluminum in the aluminum alloy connection of the primary connection bar of the substation, thus improving the safety performance;
[0014] 3. One end of the high-voltage conductive rod is fixedly connected to the high-voltage shell through a sealing flange seat, and the other end is slidably connected through a sliding sealing sleeve. When the internal air pressure changes and the high-voltage conductive rod is energized and heated and expanded, the high-voltage conductive rod can be extended and retracted along the sliding sealing sleeve, and the V-shaped sealing ring can still ensure effective sealing pressure. The expansion and contraction stress of the high-voltage conductive rod and the deformation and damage of the high-voltage conductive rod can be effectively eliminated, which can effectively improve the safety performance of the high-voltage shell part. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a schematic diagram of the structure of the utility model;
[0016] Figure 2 This is an enlarged schematic diagram of the structure of the sliding sealing sleeve 5 of the utility model;
[0017] In the figure: high-voltage housing 1, secondary coil 2, high-voltage conductive rod 3, sealing flange seat 4, sliding sealing sleeve 5, high-voltage terminal board 6, waist-shaped groove 7, V-shaped sealing ring 8. DETAILED DESCRIPTION
[0018] The following is a further description with reference to the accompanying drawings.
[0019] Figure 1 As shown: A high-voltage current transformer using dynamic sealing, including a high-voltage housing 1, a secondary coil 2, a high-voltage conductive rod 3, a sealing flange seat 4, a sliding sealing sleeve 5, and a high-voltage terminal board 6. The high-voltage housing 1 is made of steel or aluminum. The high-voltage housing 1 is filled with insulating gas. The high-voltage housing 1 is provided with a secondary coil 2, which is passed through the high-voltage conductive rod 3. The high-voltage conductive rod 3 is a low-resistance aluminum tube. One end of the high-voltage conductive rod 3 is connected to the high-voltage housing 1 through the sealing flange seat 4. The high-voltage conductive rod and the high-voltage housing are of equal potential. The other end of the high-voltage conductive rod 3 is connected to the high-voltage housing 1 through two sliding sealing sleeves 5 provided in the welding flange holes on the side of the high-voltage housing. The two ends of the high-voltage conductive rod 3 passing through the high-voltage housing 1 are connected to the high-voltage terminal board 6. The high-voltage terminal board 6 is made of forged aluminum alloy. The high-voltage terminal board 6 is provided with a waist-shaped groove 7 along the high-voltage conductive rod.
[0020] In this embodiment, the sliding sealing sleeve 5 is preferably made of nylon or polytetrafluoroethylene, and the sealing ring 8 is made of nitrile silicone rubber. Figure 2 shown.
Claims
1. A high-voltage current transformer using dynamic sealing, comprising a high-voltage housing filled with insulating gas, a secondary coil arranged in the high-voltage housing, and the secondary coil being passed through a high-voltage conductive rod, wherein: The high-voltage conductive rod is a low-resistance aluminum tube, one end of the high-voltage conductive rod is connected to the high-voltage housing via a sealing flange seat, and the other end of the high-voltage conductive rod is connected to the high-voltage housing via a sliding sealing sleeve.
2. A high voltage current transformer using dynamic sealing according to claim 1, characterized in that: The sliding sealing sleeve is arranged in a flange hole welded on the side of the high-pressure housing.
3. The high voltage current transformer using dynamic seal according to claim 1, characterized in that: The sliding sealing sleeve is made of nylon or polytetrafluoroethylene.
4. The high voltage current transformer using dynamic seal according to claim 1 is characterized in that: The surface roughness of the high-voltage conductive rod at the sliding part that cooperates with the sliding kit is Ra3.
2.
5. The high voltage current transformer using dynamic seal according to claim 3 is characterized in that: The sealing ring used in the sliding sealing sleeve is made of nitrile silicone rubber, and its cross section adopts a V-shaped structure.
6. The high voltage current transformer using dynamic seal according to claim 1, characterized in that: The high-pressure housing is made of steel or aluminum.
7. A high voltage current transformer using dynamic seal according to claim 1 or 4 or 5 or 6, characterized in that: The high voltage conductive rod and the high voltage shell are at the same potential.