Current transformer installation assembly in oil tank of oil-immersed transformer

Abstract

The utility model provides a current transformer installation assembly in an oil-immersed transformer oil tank, the installation assembly is arranged in the transformer oil tank, the installation assembly penetrates through a current transformer, the installation assembly comprises a connection copper rod and a sleeve conducting rod, the sleeve conducting rod is vertically and fixedly arranged below a sleeve, and the connection copper rod is connected with the sleeve conducting rod. The bottom of the sleeve conducting rod is fixedly connected with the upper end of the connecting copper rod through the fixing bolt, the insulating paper board is arranged on the outer side surface of the connecting copper rod in a covering mode, and the bottom of the connecting copper plate is connected with the cable lead in a pressing connection mode. According to the utility model, the structure is simple, the cost is reduced, the error rate in the production process is reduced while the production efficiency is improved, the production and the installation are convenient, and the problems of low production efficiency, frequent matching errors and the like caused by insufficient insulation distance between the current transformer and the lead in the transformer oil tank and inconvenient installation can be effectively solved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of installation of current transformers in transformer oil tanks, and particularly relates to a current transformer installation assembly in an oil-immersed transformer oil tank. BACKGROUND

[0002] The phase voltage and phase current of a transformer (reactor) cannot be directly measured, and an oil-immersed current transformer is usually used for high-voltage isolation, and the oil-immersed current transformer has a fixed transformation ratio, so that the current of the transformer (reactor) can be indirectly measured, and a metering and protection signal can be provided for the transformer and other power equipment. The existing structure is that a transformer is provided with a transformer box, one or more current transformers for measurement or protection are installed in the box, and a high-voltage lead is connected to a power grid through the current transformer and a bushing.

[0003] At present, the current transformer installed in the oil tank of an oil-immersed transformer is mostly fixedly installed on a lead wood piece, and a cable of the transformer needs to pass through the current transformer and be connected to a bushing. This installation method has two shortcomings.

[0004] Firstly, in the design process, the size of the current transformer needs to be enlarged to ensure the insulation distance due to the large cross section of the cable, and the current transformer also needs to be provided with an insulation sheath, which results in insufficient installation space, increased cost, and increased difficulty in later installation.

[0005] Secondly, in the production process, the cable is soft, and after installation, the cable may be soft and flat, so that the insulation distance between the current transformer and the lead cable cannot be ensured. CONTENT OF THE INVENTION

[0006] In order to solve the above problems, the present application provides a current transformer installation assembly in an oil-immersed transformer oil tank. The installation assembly is arranged in the interior of a transformer oil tank, and penetrates a current transformer. The installation assembly comprises a connecting copper rod and a bushing conductive rod. The bushing conductive rod is vertically and fixedly arranged below a bushing. The bottom of the bushing conductive rod is fixedly connected to the upper end of the connecting copper rod through a fixing bolt. The connecting copper rod is a hollow copper rod with two ends. An insulating paper board is arranged on the outer surface of the connecting copper rod in a covering manner. The connecting copper rod penetrates the center of the current transformer in a vertical penetrating manner. The bottom of the connecting copper plate is connected to a cable lead in a pressure bonding manner. The current transformer installation assembly can ensure reliable insulation distance between the lead and the current transformer, has a simple structure, reduces cost, improves production efficiency, reduces error rate in the production process, is convenient for production and installation, and can effectively solve the problems of insufficient insulation distance between the current transformer and the lead in the transformer oil tank, inconvenient installation, low production efficiency, and frequent cooperation errors.

[0007] The transformer oil tank is a sealed cavity, a coil is vertically arranged in the center of the transformer oil tank, a current transformer is protruded horizontally in the middle of the inner wall of the transformer oil tank, a bushing is arranged on the top of the transformer oil tank, a cable lead wire is a coil lead wire, the lower end of the cable lead wire is integrally extended with the winding of the coil, and the end of the cable lead wire is press-fitted with the connecting copper rod.

[0008] The connecting copper plate is vertically shaped and circular, hollow cavities are arranged in the inner sides of the upper and lower ends of the connecting copper plate, the outer side of the upper end of the connecting copper plate is press-fitted with the hollow cavity of the bushing conductive rod, the inner side of the lower end of the connecting copper plate is press-fitted with the hollow cavity of the cable lead wire, and the outer side surfaces between the hollow cavities of the upper and lower ends of the connecting copper plate are completely covered with insulating paper boards.

[0009] The current transformer is a central vertical connection type current transformer, the outer side of the current transformer is fixedly connected with the inner side of the transformer oil tank through a base, the bushing conductive rod is a connecting type connecting rod, the bushing conductive rod is vertically arranged at the bottom center of the bushing, and the outer side of the bushing conductive rod is connected with the connecting copper plate in a penetrating manner through a fixing bolt.

[0010] Advantages:

[0011] The current transformer installation assembly has the advantages that the insulation distance between the lead wire and the current transformer is reliable, the structure is simple, the cost is reduced, the production efficiency is improved, the error rate in the production process is reduced, the production is facilitated, the installation is convenient, the problems of low production efficiency, frequent matching errors and the like caused by insufficient insulation distance and inconvenient installation of the current transformer and the lead wire in the transformer oil tank can be effectively solved. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a schematic diagram of installation of a current transformer installation assembly in an oil-immersed transformer oil tank.

[0013] In the figure, 1 is a current transformer, 2 is a cable lead wire, 3 is a connecting copper rod, 4 is a fixing bolt, and 5 is a bushing conductive rod. DETAILED DESCRIPTION

[0014] In order to deepen the understanding of the present application, the present application will be further described in combination with examples and drawings, and the examples are only used to explain the present application and do not constitute a limitation on the protection scope of the present application.

[0015] Current transformer 1, cable lead 2, connecting copper rod 3, fixing bolt 4, sleeve conducting rod 5.

[0016] As Figure 1 shown;

[0017] A kind of current transformer 1 installation assembly in oil-immersed transformer oil tank, installation assembly is located in the inside of transformer oil tank, installation assembly penetrates current transformer 1, the installation assembly includes connecting copper rod 3 and sleeve conducting rod 5, the sleeve conducting rod 5 vertically fixedly is located below sleeve, the bottom of sleeve conducting rod 5 is fixedly connected with the upper end of connecting copper rod 3 by fixing bolt 4, the connecting copper rod 3 is hollow copper rod at both ends, the outside surface of connecting copper rod 3 is covered with insulating paper board, the connecting copper rod 3 vertically penetrates through the center of current transformer 1, the bottom of connecting copper plate is connected with cable lead 2 by crimping, the transformer oil tank is sealed cavity, the inside center of transformer oil tank is vertically provided with coil, the inside wall of transformer oil tank is laterally protruded with current transformer 1 in the middle, the top of transformer oil tank is provided with sleeve, cable lead 2 is coil lead-out wire, the lower end of cable lead 2 is integrally extended with the winding of coil, the end of cable lead 2 is connected with connecting copper rod 3 by crimping, the shape of connecting copper plate is vertical round rod, the inside of both ends of connecting copper rod 3 is provided with hollow cavity, the outside of the upper end of connecting copper rod 3 is connected with sleeve conducting rod 5 by crimping hollow cavity through fixing bolt 4, the inside of the lower end of connecting copper rod 3 is connected with cable lead 2 by crimping, the outside surface between the hollow cavities of both ends of connecting copper rod 3 is completely covered with insulating paper board, current transformer 1 is vertically connected current transformer 1, the outside of current transformer 1 is fixedly connected with the inside of transformer oil tank through base, sleeve conducting rod 5 is connecting conducting rod, sleeve conducting rod 5 is vertically arranged in the bottom center of sleeve, the outside of sleeve conducting rod 5 is connected with connecting copper rod 3 by fixing bolt 4.

[0018] Implementation example;

[0019] The cable lead 2 of coil lead-out wire is matched with a connecting copper rod 3, the cable lead 2 is reliably connected with the connecting copper rod 3 by cold pressure connection, the connecting copper rod 3 penetrates the sleeve and is connected with the sleeve conducting rod 5 of sleeve by fixing bolt 4.

[0020] In order to ensure the insulation distance between connecting copper rod 3 and current transformer 1, the connecting copper rod 3 is wrapped with insulating paper board. In this way, the cable lead 2 can be reliably electrically connected through the connecting copper rod 3, and the insulation distance between the current transformer 1 and the lead is ensured, which improves the production efficiency and reduces the error rate in the production process.

[0021] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An installation assembly of a current transformer in an oil-immersed transformer tank, the installation assembly being provided in the inside of the transformer tank, the installation assembly penetrating the current transformer, characterized in that, The installation assembly includes a connecting copper rod and a sleeve conductive rod, the sleeve conductive rod is vertically fixed below the sleeve, the bottom of the sleeve conductive rod is fixedly connected with the upper end of the connecting copper rod through a fixing bolt, the connecting copper rod is a hollow copper rod with two ends, the outer surface of the connecting copper rod is covered with an insulating paper board, the connecting copper rod vertically penetrates the center of the current transformer, and the bottom of the connecting copper plate is press-connected with the cable lead wire.

2. An oil immersed transformer tank current transformer mounting assembly according to claim 1, characterised in that, The transformer oil tank is a sealed cavity, the inside of the transformer oil tank is vertically provided with a coil, the inner wall of the transformer oil tank is laterally protrudingly provided with a current transformer, and the top of the transformer oil tank is provided with a sleeve.

3. An oil immersed transformer bushing current transformer installation assembly according to claim 1, characterized in that, The cable lead wire is a coil lead-out wire, the lower end of the cable lead wire is integrally extended with the winding of the coil, and the end of the cable lead wire is press-fitted and connected with the connecting copper rod.

4. An oil immersed transformer bushing assembly according to claim 1, wherein, The connecting copper plate is a vertical circular rod, the inner sides of the upper and lower ends of the connecting copper rod are provided with hollow cavities, the outer side of the upper end of the connecting copper rod is press-fitted and connected with the sleeve conductive rod through a fixing bolt, the inner side of the lower end of the connecting copper rod is press-fitted and connected with the cable lead wire through the hollow cavity, and the outer sides of the hollow cavities between the upper and lower ends of the connecting copper rod are completely covered with insulating paper boards.

5. An oil immersed transformer bushing assembly according to claim 1, wherein, The current transformer is a central vertical connection type current transformer, and the outer side of the current transformer is fixedly connected with the inner side of the transformer oil tank through a base.

6. An oil immersed transformer bushing assembly according to claim 1, wherein, The sleeve conductive rod is a connecting lead rod, the sleeve conductive rod is vertically and perpendicularly arranged at the bottom center of the sleeve, and the outer side of the sleeve conductive rod is penetratively connected with the connecting copper rod through a fixing bolt.

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