Interpolated all-insulation 35kV cable terminal

Abstract

The utility model relates to the field of cable terminals, in particular to an interpolated all-insulation 35kV cable terminal, which comprises a movable assembly, a static assembly, a filling cavity and an oil filling port. A static component is inserted into the upper end of the movable component; a gap between the static assembly and the movable assembly is a filling cavity; the lower end of the static assembly and the upper end of the movable assembly are provided with matched oil filling ports; the dynamic and static two-part structure is adopted, an original stress tube is replaced by the stress cone, the semi-conductive part, the transition part and the insulation part of the girdling part are combined more tightly through the stress cone, an electric field is better balanced, the temperature generated when overvoltage and overcurrent are released is reduced to the minimum, insulation between devices is enhanced by injecting a small amount of insulation flame-retardant liquid, and the reliability of the girdling device is improved. And the heat dissipation speed is increased, so that the stress cone is kept wet, the aging phenomenon caused by temperature is avoided, and the pressure is always kept, thereby solving the problem of hot melting breakdown caused by non-uniform electric stress distribution of the cable terminal in the 35kV switch cabinet, and reducing the possibility of accident influence and further expansion of property loss.

Description

Technical Field

[0001] The utility model relates to the field of cable terminals, in particular to an internal plug-in type fully insulated 35kV cable terminal. Background Art

[0002] 35kV cable terminals are important components in power systems that connect electrical equipment and cable lines. With the development and transformation of power systems, the technology of cable terminals has been continuously updated. As the cold shrinkage technology and heat shrinkage technology of cable terminal heads continue to mature and change, 35kV cable terminals are widely used in the incoming and outgoing lines of industrial and mining enterprises. With the advantages of small space, low maintenance and easy use, they have gradually replaced the overhead lines within the factory.

[0003] However, the subsequent thermal breakdown failure of cable terminals has become a hot topic in the power industry. This phenomenon can easily cause electrical accidents of level 2 or above. Secondly, the cable terminals in the cabinets often burst during operation. The existence of the above problems poses a great threat and loss to the stable operation of the production system.

[0004] Therefore, to address the above-mentioned problem of thermal breakdown failure of cable terminals, an internal plug-in fully insulated 35kV cable terminal can be designed. Utility Model Content

[0005] To overcome the problem of thermal breakdown failure at cable terminals.

[0006] The technical solution of the utility model is: an internal plug-in fully insulated 35kV cable terminal, comprising a dynamic component, a static component, a filling cavity, and an oil filling port; the static component is inserted into the upper end of the dynamic component; the gap between the static component and the dynamic component is the filling cavity; the lower end of the static component and the upper end of the dynamic component are provided with oil filling ports that match the positions; the dynamic component comprises an insertion head, a stress cone, a base and a grounding lead-out cable; the upper end of the insertion head is equipped with a stress cone; the lower end of the insertion head is equipped with a base; the lower end of the base is equipped with a grounding lead-out cable; the static component comprises an outer shell, an inserted seat and a conductive connecting cable; the inserted seat is installed at the upper end of the inner side of the outer shell; and the upper end of the inserted seat is provided with a conductive connecting cable.

[0007] Preferably, the research and development of the new plug-in fully insulated 35kV cable terminal adopts the design of replacing the stress tube with the stress cone of the dynamic component, so that the semi-conductive part, the transition part and the insulating part of the ring-stripping part are connected more tightly through the stress cone, so as to better balance the electric field and reduce the temperature generated when the cable terminal releases overvoltage and overcurrent to a minimum. Secondly, by designing the oil filling port and injecting a small amount of insulating flame retardant liquid into the filling cavity, on the one hand, the insulation between the components is strengthened and the heat dissipation speed is accelerated. On the other hand, the stress cone can be kept moist to prevent aging caused by temperature, and the voltage and pressure balance can be maintained continuously.

[0008] Preferably, the stress cone is of a conical shape that is narrow at the top and wide at the bottom; the slot of the inserted seat is of a conical groove that is narrow at the top and wide at the bottom; and the stress cone is inserted into the inner side of the insertion groove of the inserted seat.

[0009] Preferably, the base is made of fully insulating material.

[0010] Preferably, the housing is made of fully insulating material.

[0011] Preferably, the dynamic component further includes a seal; a seal is provided at the connection between the ground lead cable and the base.

[0012] Preferably, the static component further includes an edge sealing ring; an edge sealing ring is provided at the connection between the conductive connecting cable and the housing.

[0013] Beneficial effects of the utility model:

[0014] The utility model adopts a dynamic and static two-part structure. The dynamic structure consists of an insertion head, a stress cone, a base and a grounding lead-out cable. The static structure consists of an outer shell, an inserted seat and a conductive connecting cable. The original stress tube is replaced with a stress cone, so that the semi-conductive part, the transition part and the insulating part of the ring-stripping part are more tightly combined through the stress cone, the electric field is better balanced, and the temperature generated when releasing overvoltage and overcurrent is reduced to a minimum. By injecting a small amount of insulating flame retardant liquid, the insulation between components is strengthened, the heat dissipation speed is increased, the stress cone is kept moist and does not age due to temperature, and the pressure is always maintained. In this way, the problem of thermal melt breakdown caused by uneven electrical stress distribution at the cable terminal in the 35kV switch cabinet is solved, and the possibility of further expansion of accident impact and property loss is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Shown is a schematic diagram of the overall structure of the cable terminal of the utility model;

[0016] Figure 2 Shown is a schematic diagram of the structure of the dynamic components of the cable terminal of the present utility model;

[0017] Figure 3 Shown is a schematic diagram of the static component structure of the cable terminal of the present invention.

[0018] Explanation of the reference numerals: 1. Moving component; 101. Insertion head; 102. Stress cone; 103. Base; 104. Seal; 105. Grounding lead-out cable; 2. Static component; 201. Housing; 202. Inserted seat; 203. Edge sealing ring; 204. Conductive connecting cable; 3. Filling cavity; 4. Oil filling port. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] See also Figure 1-3 The utility model provides an embodiment: an internal plug-in fully insulated 35kV cable terminal, comprising a dynamic component 1, a static component 2, a filling cavity 3, and an oil filling port 4; the static component 2 is inserted into the upper end of the dynamic component 1; the gap between the static component 2 and the dynamic component 1 is the filling cavity 3; the lower end of the static component 2 is provided with an oil filling port 4 that matches the position of the upper end of the dynamic component 1; the dynamic component 1 comprises an insertion head 101, a stress cone 102, a base 103 and a grounding lead-out cable 105; the upper end of the insertion head 101 is equipped with a stress cone 102; the lower end of the insertion head 101 is equipped with a base 103; the lower end of the base 103 is equipped with a grounding lead-out cable 105; the static component 2 comprises a shell 201, an inserted seat 202 and a conductive Connecting cable 204; an inserted seat 202 is installed at the upper end of the inner side of the shell 201; a conductive connecting cable 204 is provided at the upper end of the inserted seat 202; the stress cone 102 adopts a conical shape that is narrow at the top and wide at the bottom; the slot of the inserted seat 202 adopts a conical groove that is narrow at the top and wide at the bottom; the stress cone 102 is inserted into the inner side of the insertion groove of the inserted seat 202; the base 103 is made of fully insulating material; the shell 201 is made of fully insulating material; the dynamic component 1 also includes a seal 104; a seal 104 is provided at the connection between the grounding lead cable 105 and the base 103; the static component 2 also includes an edge sealing ring 203; an edge sealing ring 203 is provided at the connection between the conductive connecting cable 204 and the shell 201.

[0021] During operation, the research and development of the new plug-in fully insulated 35kV cable terminal adopts the design of replacing the stress tube with the stress cone 102 of the dynamic component 1, so that the semi-conductive part, the transition part and the insulating part of the ring-stripping part are connected more tightly through the stress cone 102, so as to better balance the electric field and reduce the temperature generated when the cable terminal releases overvoltage and overcurrent to a minimum. Secondly, by designing the oil filling port 4 and injecting a small amount of insulating flame retardant liquid into the filling cavity 3, on the one hand, the insulation between the components is strengthened and the heat dissipation speed is accelerated. On the other hand, the stress cone 102 can be kept moist to prevent aging caused by temperature, and the voltage and pressure balance can be maintained continuously.

Claims

1. An internal plug-in type fully insulated 35kV cable terminal, comprising a movable component (1); characterized in that: The invention also includes a static component (2), a filling cavity (3), and an oil filling port (4); the static component (2) is inserted into the upper end of the dynamic component (1); the gap between the static component (2) and the dynamic component (1) is the filling cavity (3); the lower end of the static component (2) and the upper end of the dynamic component (1) are provided with an oil filling port (4) whose positions match; the dynamic component (1) includes an insertion head (101), a stress cone (102), a base (103) and a grounding lead-out cable (105); the insertion head (101) 01) is provided with a stress cone (102) at the upper end; a base (103) is provided at the lower end of the insertion head (101); a grounding lead cable (105) is provided at the lower end of the base (103); the static component (2) comprises a housing (201), an inserted seat (202) and a conductive connection cable (204); the inserted seat (202) is provided at the upper end of the inner side of the housing (201); and a conductive connection cable (204) is provided at the upper end of the inserted seat (202).

2. The internally inserted fully insulated 35kV cable terminal according to claim 1, characterized in that: The stress cone (102) is a conical shape that is narrow at the top and wide at the bottom; the slot of the inserted seat (202) is a conical groove that is narrow at the top and wide at the bottom; and the stress cone (102) is inserted into the inner side of the insertion groove of the inserted seat (202).

3. The internally inserted fully insulated 35kV cable terminal according to claim 1, characterized in that: The base (103) is made of fully insulating material.

4. The internally inserted fully insulated 35kV cable terminal according to claim 1, characterized in that: The housing (201) is made of fully insulating material.

5. The internally inserted fully insulated 35kV cable terminal according to claim 1, characterized in that: The dynamic component (1) further includes a sealing member (104); a sealing member (104) is provided at the connection between the ground lead cable (105) and the base (103).

6. The internally inserted fully insulated 35kV cable terminal according to claim 1, characterized in that: The static component (2) further includes an edge sealing ring (203); the edge sealing ring (203) is provided at the connection between the conductive connecting cable (204) and the housing (201).

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