External structure of current transformer of power transformer
By placing the current transformer outside the transformer, the problems of inaccurate detection and high maintenance costs caused by the current transformer being installed inside the transformer are solved, thereby improving detection accuracy and maintenance efficiency, while reducing the size of the transformer and installation costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2026-03-27
AI Technical Summary
The current transformers in existing power transformers are installed inside the transformer, which leads to inaccurate detection, high maintenance and replacement costs, and increased transformer size.
The current transformer adopts an external structure, which involves installing the transformer housing outside the transformer and setting the current-carrying conductor and connecting conductor inside. The external structure design allows the transformer to be installed independently of the transformer, simplifying the maintenance process and reducing the size of the transformer.
This has improved the accuracy of current transformer detection and maintenance efficiency, reduced the size and installation cost of transformers, and simplified the maintenance process.
Smart Images
Figure CN224052962U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of power transformer, specifically, relate to a power transformer current transformer external structure. BACKGROUND
[0002] At present, the current transformer used in the conventional power transformer is the bushing type current transformer, the installation position of the current transformer is in the elevated seat of the bushing tail, the nut or the connecting plate is arranged in the elevated seat, and the pressing plate is installed at the position of the nut or the connecting plate after the current transformer is placed to play a fixing role.
[0003] If the number of the current transformers is large, the size is large, and the bushings must be placed in the elevated seat, the elevated seat will be large and high, which not only increases the manufacturing and installation difficulty, but also increases the size of the transformer.
[0004] In addition, because the current transformer is installed close to the transformer oil tank, the transformer is a device that is particularly sensitive to temperature rise, so the temperature rise of the transformer will cause the temperature drift of the current transformer, resulting in inaccurate measurement, and in addition, because the current transformer is installed in the elevated seat of the oil tank on the transformer side, if maintenance or replacement is required, the transformer must be drained and the related bushings and elevated seat must be disassembled before operation, and the maintenance process is more cumbersome, finally, because the current transformer is generally installed in the CT area at the tail of the bushing, the end conductor of the bushing on the transformer side needs to be lengthened to form the CT area, which indirectly causes the size of the elevated seat for installing the bushing to be large and high, increasing the size of the transformer and the amount of transformer oil used.
[0005] The current transformer in the prior art has the following problems:
[0006] 1. The detection value of the current transformer is affected by the temperature inside the transformer.
[0007] 2. The transformer oil needs to be emptied for replacement, which is costly.
[0008] 3. The size of the high-voltage bushing is high, which increases the volume of the entire transformer, resulting in high cost. SUMMARY
[0009] The utility model provides a kind of power transformer current transformer external structure, solve the problem of unstable detection of current transformer and high replacement and maintenance cost in related technology because of being arranged in the voltage inside.
[0010] The technical scheme of the utility model is as follows:
[0011] To achieve the above object, the utility model provides the following technical scheme: A power transformer current transformer external structure, including the mutual inductor shell, the mutual inductor shell, the top welding of mutual inductor shell has the connecting flange no.
[0012] The top of the current-carrying conductor is provided with a GIL connecting conductor, the bottom of the current-carrying conductor is provided with a GIS connecting conductor, the diameters of the GIL connecting conductor and the GIS connecting conductor are same as the diameter of the current-carrying conductor, and the GIL connecting conductor and the GIS connecting conductor are provided with a bottom sealing ring and a top sealing ring respectively at the connecting positions with the mutual inductor shell.
[0013] Preferably, the outer circumferential surface of the mutual inductor shell is provided with an access hole, the access hole is communicated with the inside of the mutual inductor shell, and a detachable access door is arranged on the access hole.
[0014] Preferably, the side of the mutual inductor shell is provided with a display table, the display table is electrically connected with the current transformer, and the display table is used for displaying the current detected by the current transformer.
[0015] Preferably, the inside of the connecting flange no. and the connecting flange no. 2 is provided with a plurality of connecting holes arranged in a ring array, the whole mutual inductor can be conveniently disassembled and assembled through the connecting flanges, and the flexibility is improved.
[0016] The working principle and beneficial effects of the utility model are as follows:
[0017] 1. The utility model discloses an external structure of mutual inductor which is separated from the transformer body, and the installation limitation of the transformer is avoided, so that the installation can be performed in real time, and the temperature drift caused by the temperature change of the transformer body is avoided, the accuracy of detection is ensured, the size of the transformer is greatly reduced, the installation space is saved, the installation cost is saved, and the efficiency of maintenance is improved. ACCURACY
[0018] The utility model will be further and specifically explained in connection with the drawings and specific embodiment.
[0019] Fig. 1 It is the whole structure schematic view of the utility model;
[0020] Fig. 2 It is the side sectional view of the utility model;
[0021] Fig. 3 It is the use structure diagram of the utility model.
[0022] In the drawing: 1, mutual inductor shell;2, current-carrying conductor;3, GIL connecting conductor;4, GIS connecting conductor;5, current transformer;6, bottom sealing ring;7, top sealing ring;8, access hole;9, display table;10, internal protective shell. DETAILED DESCRIPTION
[0023] The technical scheme in the embodiments of the utility model will be described below in conjunction with the embodiments of the utility model, apparently, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor are involved in the scope of the utility model protection.
[0024] As Figs. 1-3 shown, the embodiment provides an external structure of power transformer current transformer, which comprises a mutual inductor shell 1, the top of the mutual inductor shell 1 is welded with a connecting flange one, the bottom of the mutual inductor shell 1 is welded with a connecting flange two, the internal of the mutual inductor shell 1 is installed with a current transformer 5, the internal of the current transformer 5 is provided with an installation groove, the internal of the installation groove is installed with an internal protective shell 10, the internal of the internal protective shell 10 is provided with a through groove, and the internal of the through groove is provided with a current-carrying conductor 2.
[0025] The top of the current-carrying conductor 2 is provided with a GIL connecting conductor 3, the bottom of the current-carrying conductor 2 is provided with a GIS connecting conductor 4, the diameter of the GIL connecting conductor 3 and the GIS connecting conductor 4 is same with the diameter of the current-carrying conductor 2, and the connecting place of the GIL connecting conductor 3 and the GIS connecting conductor 4 with the mutual inductor shell 1 is respectively provided with a bottom sealing ring 6 and a top sealing ring 7.
[0026] As Figs. 1-3 shown, the external circumferential surface of the mutual inductor shell 1 is provided with an access hole 8, the access hole 8 is communicated with the internal of the mutual inductor shell 1, and the access hole 8 is provided with a detachable access door, by setting the detachable access door, when the current transformer 5 needs to be overhauled, only the access door needs to be opened to overhaul, and the efficiency of overhaul is increased.
[0027] As Figs. 1-3As shown, one side of the transformer housing 1 is provided with a display table 9, the display table 9 and the current transformer 5 are electrically connected, the display table 9 is used for displaying the current detected by the current transformer 5, the display table 9 is arranged outside, the current detected by the internal current transformer 5 can be conveniently seen, a plurality of connection holes in the form of annular array are uniformly distributed in the inside of the connecting flange one and the connecting flange two, the whole transformer can be conveniently disassembled and assembled through the connecting flange, and the installation according to the transformer assembly is not required, and the flexibility is improved.
[0028] In the embodiment, the current transformer 5 is innovatively separated from the transformer body and independently installed in the transformer housing 1, the transformer housing 1 is ingeniously arranged outside the transformer, the design ingeniously avoids the limitation caused by the complexity and size difference of the transformer structure, and in addition, because the transformer housing 1 is a prefabricated component, the installation process is completely independent of the installation schedule of the transformer, and the flexibility and efficiency of engineering implementation are further improved.
[0029] The scheme discards the traditional oil injection and sleeve installation steps, improves the efficiency of maintenance work, and through the specially arranged maintenance opening 8, the maintenance personnel can easily access and perform necessary maintenance work, ensuring the continuous and reliable operation of the equipment.
[0030] Further, according to the specific outgoing line mode of the transformer, a special installation interface is reserved on the power transmission line GIL (gas insulated power transmission line), so that the transformer housing 1 can be directly and conveniently installed in place, and through the seamless connection between the GIL connecting conductor 3 and the transformer outgoing line sleeve or basin, efficient monitoring of the current is realized without additional complex configuration.
[0031] In summary, the innovative design of separating the current transformer from the transformer body and adopting an external structure not only successfully breaks through the traditional limitations of transformer installation, effectively avoids the temperature drift problem caused by the temperature change of the transformer body, but also greatly simplifies the maintenance process - only a single gas chamber needs to be opened to complete the maintenance, and the system state is restored through rapid air replenishment, in addition, the design also significantly reduces the overall size of the transformer, effectively saves valuable installation space and cost, and opens up a new path for the optimization of the layout of the power system and efficient operation and maintenance.
[0032] The above is only a preferred embodiment of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.
Claims
1. An external current transformer structure for power transformers, characterized in that, Includes a transformer housing (1), the transformer housing (1) has a connecting flange one welded to its top and a connecting flange two welded to its bottom, a current transformer (5) installed inside the transformer housing (1), an installation groove is provided inside the current transformer (5), an inner protective shell (10) is installed inside the installation groove, a through groove is provided inside the inner protective shell (10), and a current-carrying conductor (2) is provided inside the through groove; A GIL connecting conductor (3) is provided at the top of the current-carrying conductor (2), and a GIS connecting conductor (4) is provided at the bottom of the current-carrying conductor (2). The diameters of the GIL connecting conductor (3) and the GIS connecting conductor (4) are the same as the diameter of the current-carrying conductor (2). Bottom sealing rings (6) and top sealing rings (7) are respectively provided at the connection points between the GIL connecting conductor (3) and the GIS connecting conductor (4) and the transformer housing (1).
2. The external current transformer structure for a power transformer according to claim 1, characterized in that, The transformer housing (1) has an inspection port (8) on its outer peripheral surface. The inspection port (8) is connected to the interior of the transformer housing (1). The inspection port (8) has a detachable inspection door.
3. The external current transformer structure for a power transformer according to claim 1, characterized in that, A display meter (9) is provided on one side of the current transformer housing (1). The display meter (9) is electrically connected to the current transformer (5). The display meter (9) is used to display the current detected by the current transformer (5).
4. The external current transformer structure for a power transformer according to claim 1, characterized in that, Both the first connecting flange and the second connecting flange have several connecting holes arranged in a circular array inside.