JP7629476B2 - Cable Termination - Google Patents

Description

The present invention relates to a cable termination connection part.

Conventionally, a gas-filled cable termination connection that connects a sealed power device such as a gas insulated switchgear (GIS) to a power cable is known as a cable termination connection (see, for example, Patent Document 1). Such a cable termination connection is formed by connecting a cable terminal portion to which a connection material is attached to an insulating unit (called a "bushing") having an inner conductor and a bushing body made of a hard insulator such as epoxy resin that is placed around the outer periphery of the inner conductor.

As described in, for example, Patent Document 1, the bushing is hermetically fixed to the equipment case by inserting the tip end from which the internal conductor is drawn into an attachment port provided in the equipment case and fixing a fixing flange provided at the rear end of the bushing body to the equipment case. An insulating gas such as _SF6 gas is sealed inside the equipment case. However, while _SF6 gas has excellent insulating performance, it also has a high greenhouse effect, and in recent years, an alternative gas to _SF6 gas (e.g., dry air, etc.) has been used as the insulating gas in consideration of the environment.

Patent No. 5548567

However, since the insulating performance of the alternative gas to _SF6 gas is lower than that of _SF6 gas, when the alternative gas to _SF6 gas is used as the insulating gas for electric power equipment such as GIS, the insulating gas pressure of the alternative gas to _SF6 gas must be increased in order to obtain the same dielectric strength as when _SF6 gas is used. Increasing the insulating gas pressure increases the distortion of the equipment case, and depending on the material and thickness of the equipment case, distortion occurs in the fixing flange of the bushing fixed to the equipment case (especially when it is made of the same hard insulator as the bushing body), which may damage the bushing.

Traditionally, the specifications of the joints (for example, the thickness of the equipment case and the fixing flange) have been discussed in advance with the power equipment manufacturer, and the equipment case and the fixing flange have been designed so that they will not be distorted by the gas pressure used.

The object of the present invention is to provide a highly safe cable termination connection that can prevent damage to the bushing due to distortion of the device case.

The cable termination according to the present invention comprises:
A cable termination connection part to be installed in a case opening of a device case of an electric power device,
a bushing having an internal conductor and a bushing body made of insulating hard plastic resin arranged to cover an outer circumferential surface of the internal conductor;
a cable terminal portion of a power cable to be attached to the bushing;
a metal adapter flange having a flange opening and relaying a connection between the bushing and the device case;
The bushing body has a head portion on a front end side that is accommodated inside the device case, and a fixing flange that is arranged on a rear end side of the head portion,
the adapter flange is fixed to the equipment case such that the flange opening communicates with the case opening;
The fixing flange is fixed to the adapter flange ,
A shielding portion is provided at a portion of the bushing that corresponds to the flange opening .

The present invention can prevent damage to the bushing due to distortion of the device case, improving the safety of the cable termination connection.

FIG. 1 is a cross-sectional view showing a cable termination according to an embodiment of the present invention. 2A and 2B are plan views of the configuration of the joint portion of the cable termination portion as viewed from the rear end side. 3A to 3C are diagrams showing the dimensional relationship between the device case, the adapter flange, and the fixing flange.

The following describes in detail the embodiments of the present invention with reference to the drawings.

Figure 1 shows a cable termination connection part 1 according to an embodiment. In Figure 1, a bushing 10 is shown in a half cross-sectional view. Figures 2A and 2B are plan views of the configuration of the connection part (interface) of the cable termination connection part 1 as seen from the rear end side. Figures 2A and 2B show a case in which a three-phase power cable 50 is connected to power equipment, that is, a case in which three cable termination connection parts 1 to which cable terminal parts 20 for each phase of the power cable are attached are installed in an equipment case 60.

The cable termination 1 is a gas termination that is applied to the connection (mating portion) of electric power equipment that requires airtightness, such as a switchgear or a transformer. As shown in Fig. 1, the cable termination 1 has a bushing 10, a cable terminal 20, and an adapter flange 30, and is installed in a case opening 61 of an equipment case 60 of the electric power equipment. The case opening 61 is typically circular in shape. An alternative gas to _SF6 gas (e.g., dry air, etc.) is enclosed inside the equipment case 60 as an insulating gas.

In the following description, the side from which the internal conductor 11 is pulled out (upper side in FIG. 1) is referred to as the "tip side," and the side to which the cable terminal portion 20 is attached (lower side in FIG. 1) is referred to as the "rear side."

In the cable termination connection part 1, the bushing 10 has an inner conductor 11 and an insulating bushing body 12 arranged to cover the outer peripheral surface of the inner conductor 11. The inner conductor 11 and the bushing body 12 are integrally formed, for example, by molding.

The internal conductor 11 is formed of a conductive material suitable for electrical conduction, such as copper, aluminum, a copper alloy, or an aluminum alloy. The inner peripheral surface of the internal conductor 11 is exposed from the bushing body 12, and is provided with a conductor insertion portion (reference numeral omitted) for electrically connecting the cable conductor 51. The tip end of the internal conductor 11 penetrates the bushing body 12 and is connected to the conductor of the power device (not shown). The shape of the internal conductor 11 is not limited, and may be, for example, a large-diameter shape with the exposed tip side having a shield shape. When connecting the internal conductor 11 to the conductor of the power device (not shown), it may be connected via a separately prepared connection terminal (not shown) or directly.

The bushing body 12 is formed of a plastic resin material (e.g., epoxy resin or fiber reinforced plastics (FRP)) which is a hard insulator with high mechanical strength. In this embodiment, the bushing body 12 is an epoxy bushing formed of epoxy resin, that is, the fixing flange 123 described below is formed of epoxy resin. The bushing body 12 has a head portion 121 housed inside the device case 60, an electric field mitigation portion 122 connected to the rear end side of the head portion 121, and a fixing flange 123 connected to the rear end side of the electric field mitigation portion 122.

The bushing body 12 has a cone-shaped terminal insertion portion (reference number omitted) that receives the cable terminal portion 20, spanning the fixing flange 123, the electric field mitigation portion 122, and the rear end of the head portion 121. The terminal insertion portion communicates with the conductor insertion portion of the internal conductor 11. The cable insertion port 124 (see Figures 2A and 2B) on the rear end side of the terminal insertion portion is formed, for example, in a circular shape. The conductor insertion portion (reference number omitted) and the terminal insertion portion 124 form a cable receiving portion into which the cable terminal portion 20 is attached.

The head portion 121 is the portion that is housed inside the device case 60, and its rear end is formed into a bell-mouth shape.

For example, a conductive paint (not shown) is applied to the outer surface of the electric field mitigation portion 122. The conductive paint is electrically connected to the device case 60, and functions as a shielding portion of the bushing 10. By providing a shielding portion in the bushing 10, the electric field does not concentrate inside the bushing body 12, and the electrical characteristics of the bushing 10 are stabilized.

The shielding portion of the bushing 10 may be formed of a shielding metal fitting embedded inside the electric field mitigation portion 122. In addition, the portion of the rear end side of the stress cone 22 attached to the cable terminal portion 20, which is made of a semi-conductive rubber material, also functions as the shielding portion of the bushing 10.

The fixing flange 123 is formed so as to protrude radially outward beyond the head portion 121 and the electric field mitigation portion 122. The fixing flange 123 has, for example, a hexagonal shape in plan view from the axial direction (see Figures 2A and 2B). Note that the shape of the fixing flange 123 in plan view is not limited to a hexagon, and may be, for example, a circle or a regular polygon other than a hexagon.

The fixing flange 123 is fixed to the adapter flange 30, for example, by bolting. A sealing member (not shown) such as an O-ring is disposed between the fixing flange 123 and the adapter flange 30 to maintain airtightness inside the device case 60.

The adapter flange 30 is a plate-like member that relays the connection between the bushing 10 and the device case 60. The adapter flange 30 has, for example, a circular outer shape in plan view from the axial direction (see FIG. 2A). Note that the outer shape of the adapter flange 30 in plan view is not limited to a circle, and may be, for example, a hexagon (see FIG. 2B) or a regular polygon other than a hexagon.

The adapter flange 30 is formed of a metal material such as stainless steel, and has a bending strength that can tolerate distortion of the equipment case 60. "Tolerating distortion of the equipment case 60" means that it will not break even if distortion (deformation) occurs in the equipment case 60 during operation of the cable termination connection unit 1 (it may deform slightly in response to the deformation of the equipment case 60).

The adapter flange 30 has a circular flange opening 31 in the center. The opening size of the flange opening 31 is set so that the rear end (bell-mouth portion) of the head portion 121 of the bushing body 12 can be inserted therethrough. The opening edge on the tip side of the flange opening 31 is preferably chamfered, such as with an R chamfer or a C chamfer. The adapter flange 30 is fixed to the equipment case 60, for example, by bolting. A seal member (not shown), such as an O-ring, is disposed between the adapter flange 30 and the equipment case 60 to maintain airtightness inside the equipment case 60.

The adapter flange 30 is fixed to the equipment case 60 so that the case opening 61 and the flange opening 31 are in communication. In addition, the fixed flange 123 is fixed to the adapter flange 30 with the bushing 10 inserted into the case opening 61 and the flange opening 31. In this embodiment, the adapter flange 30 is fixed to the equipment case 60 by abutting the front end surface of the adapter flange 30 against the rear end surface of the equipment case 60. In addition, the bushing 10 is fixed to the adapter flange 30 by abutting the front end surface of the fixed flange 123 against the rear end surface of the adapter flange 30.

When fixing the bushing 10 to the equipment case 60, the adapter flange 30 may be fixed to the equipment case 60 before the bushing 10 (fixing flange 123) is fixed to the adapter flange 30, or the bushing 10 may be fixed to the adapter flange 30 before the adapter flange 30 is fixed to the equipment case 60.

The bushing 10 is fixed airtightly to the equipment case 60 via the adapter flange 30. Therefore, even if distortion occurs in the equipment case 60, the distortion of the equipment case 60 is absorbed by the adapter flange 30 and is not directly transmitted to the bushing body 12 of the bushing 10 (specifically, the fixing flange 123). Therefore, damage to the fixing flange 123 made of epoxy resin can be prevented.

The bending strength of the adapter flange 30 can be appropriately adjusted, for example, by the plate thickness of the adapter flange 30. In the case of a general equipment case 60 having a plate thickness of about 30 mm, for example, by making the plate thickness of the adapter flange 30 20 mm or more, the adapter flange 30 will not be damaged even if the insulating gas pressure is made higher than that of _SF6 gas. That is, the maximum gas pressure that can be tolerated by the insulating gas inside the equipment case 60 can be increased. Therefore, as in the present embodiment, it is applicable not only to the case where the insulating gas inside the equipment case 60 is a substitute gas for _SF6 gas (e.g., dry air, etc.) but also to the case where _SF6 gas needs to be used at a gas pressure higher than that of the conventional case.

In the cable termination connection section 1, the cable terminal section 20 is configured by attaching connection materials such as a conductor connection terminal 21, a stress cone 22, a compression device 23, a cable protection fitting 24, and a corrosion protection layer 25 to the tip of the power cable 50.

The power cable 50 is, for example, a power cable insulated with rubber or plastic. The power cable 50 has, in order from the center, a cable conductor 51, a cable insulator 52, a cable outer semiconductive layer (not shown), a cable shielding layer (not shown), and a cable sheath (not shown). At the cable terminal portion 20, each layer is exposed by step-stripping a predetermined length from the tip of the power cable 50.

A conductive conductor connection terminal 21 suitable for current flow and made of, for example, copper, aluminum, a copper alloy, or an aluminum alloy, is connected to the cable conductor 51 by compression. The conductor connection terminal 21 is formed of a conductive material suitable for current flow and made of, for example, copper, aluminum, a copper alloy, or an aluminum alloy. The conductor connection terminal 21 and the internal conductor 11 may be electrically connected by a tulip contact structure, or may be connected via a conductor contact (not shown) such as a multi-lambda band, or may be connected by other known connection methods. A stress cone 22 is attached to the outer peripheral surface extending from the cable insulator 52 to the tip of the cable outer semiconductive layer.

The stress cone 22 is formed in a spindle shape and has an insulating portion (symbol omitted) at the tip end and a semiconductive portion (symbol omitted) at the rear end. The insulating portion is formed in a cylindrical shape from an insulating rubber material such as ethylene propylene rubber (EP rubber), and the semiconductive portion is formed in a cylindrical shape from a semiconductive rubber material such as semiconductive EP rubber. The insulating portion and the semiconductive portion are integrally formed by molding.

The rear end (semiconductive portion) of the stress cone 22 is connected to the cable external semiconductive layer of the power cable 50. As long as the rear end of the stress cone 22 has the specified performance as the cable termination connection portion 1, it may be directly connected to the cable external semiconductive layer, or may be connected to the end of the cable external semiconductive layer via an end of the external semiconductive layer reproduced with a mold or conductive paint. The tip portion (insulating portion) of the stress cone 22 has a shape corresponding to the cable receiving portion of the bushing 10. A compression device 23 and a cable protection bracket 24 are attached to the rear end side of the stress cone 22.

The compression device 23 has, for example, a pressing fitting (not shown) that abuts against the stress cone 22, a coil spring (not shown) that biases the pressing fitting toward the stress cone 22, and a pressing fitting flange (not shown) that supports the pressing fitting and the coil spring.

After the tip of the power cable 50 is stripped, the cable protection bracket 24, compression device 23, and stress cone 22 are inserted into the power cable 50, and the conductor connection terminal 21 is attached to the cable conductor 51. The tip of the cable terminal 20 is then inserted into the cable receiving section of the bushing 10, and while compressing the coil spring of the compression device 23, the pressing bracket flange is bolted to the rear end face of the bushing body 12, and the cable protection bracket 24 is bolted to the pressing bracket flange, thereby attaching the cable terminal 20 to the cable receiving section.

In the embodiment shown in FIG. 1, an example is shown in which the compression device 23 is a press fitting flange that is visible from the outside, but the structure of the compression device 23 is not particularly limited, and the compression device may be housed in a cable protection fitting 24 with a shaft. In this case, the cable protection fitting 24 is bolted to the rear end surface of the bushing body 12, rather than a press fitting flange.

The tip of the stress cone 22 is pressed against the inner surface of the bushing body 12, and the conductor connection terminal 21 is electrically connected to the inner conductor 11. In addition, a corrosion-resistant layer 25 for waterproofing is disposed at the rear end of the cable protection fitting 24. In this way, the cable termination connection part 1 can be assembled with relatively simple operations by plug-in connection.

Figures 3A to 3C are diagrams showing the dimensional relationship between the device case 60, the adapter flange 30, and the fixed flange 123. Figure 3A shows the opening size (inner diameter R1) of the case opening 61 of the device case 60. Figure 3B shows the relationship between the opening size (inner diameter R1) of the case opening 61 and the opening size (inner diameter R21) and outer size (outer diameter R22) of the flange opening 31 of the adapter flange 30. Figure 3C shows the relationship between the opening size (inner diameter R21) of the flange opening 31 of the adapter flange 30 and the opening size (inner diameter R31) and outer size of the cable insertion port 124 of the fixed flange 123. In Figure 3C, the outer size of the fixed flange 123 is represented by the diameter R32 of the inscribed circle of the hexagonal outer shape.

The case opening 61 of the equipment case 60 shown in FIG. 3A can be set to have a larger inner diameter R1 than in the conventional case where the bushing is fixed directly to the equipment case 60 with bolts or the like without using the adapter flange 30.

As shown in FIG. 3B, the outer size (outer diameter R22) of the adapter flange 30 is set to be larger than the opening size (inner diameter R1) of the case opening 61 so that the adapter flange 30 and the device case 60 overlap in the axial direction.

Also, as shown in FIG. 3B, the opening size (inner diameter R21) of the flange opening 31 is set smaller than the opening size (inner diameter R1) of the case opening 61. In other words, the opening size of the case opening 61 is larger than the opening size of the flange opening 31. In this case, the inner diameter R1 of the case opening 61 in the device case 60 is set larger than when the bushing is fixed directly to the device case 60 with a bolt or the like without using the adapter flange 30 as in the conventional case, so that the distance between the center conductor (cable conductor 51) on the high-voltage side of the cable termination connection part 1 and the device case 60 on the ground side can be increased, and the electric field applied to the bushing 10 can be reduced.

In addition, the inner diameter R1 of the case opening 61 in the device case 60 is set larger than in the conventional case where the adapter flange 30 is not present, so that the distance between the outer shape of the head portion 121 of the bushing 10 and the device case 60 is larger than in the conventional case, allowing the bushing 10 to be easily inserted into the case opening 61 and preventing damage to the bushing 10 due to contact with the device case 60.

If the adapter flange 30 is simply interposed between the fixed flange 123 and the equipment case 60 for a bushing 10 and equipment case 60 that are not intended to be attached to power equipment via the adapter flange 30, the case opening 61 of the equipment case 60, which is the ground side, will be located closer to the tip of the bushing 10 than in the past, affecting the electric field distribution inside the equipment and reducing electrical performance. Therefore, in terms of reducing the electric field, it is preferable that the opening size (inner diameter R1) of the case opening 61 be larger than the opening size (inner diameter R21) of the flange opening 31.

In addition, when attaching the bushing 10 via the adapter flange 30 to an equipment case 60 whose case opening 61 has a fixed size, there is no need to match the outer size of the fixing flange 123 to the opening size of the case opening 61 of the equipment case 60, and the outer size of the fixing flange 123 can be made smaller than when it is matched to the opening size of the case opening 61 of the equipment case 60. This allows the fixing flange 123 to be made smaller, and therefore the bushing 10 to be made smaller.

As shown in FIG. 3C, the outer size of the fixing flange 123 (the size of the hexagon corresponding to the diameter R32 of the inscribed circle) is set to be larger than the opening size (inner diameter R21) of the flange opening 31 so that the fixing flange 123 and the adapter flange 30 overlap in the axial direction. In other words, the outer size of the fixing flange 123 is not limited by the opening size (inner diameter 61) of the case opening 61 of the equipment case 60. Therefore, by adopting an adapter flange 30 of a size that fits the case opening 61 of the equipment case 60, the bushing 10 can be fixed to the equipment case 60 regardless of the case opening 61 of the equipment case 60 (an example of the specifications of the interface between the bushing 10 and the power equipment).

As described above, the cable termination connection unit 1 according to this embodiment has the following features, either alone or in any suitable combination:

That is, the cable terminal connection part 1 is a cable terminal connection part installed in the case opening 61 of the equipment case 60 of the power equipment, and includes a bushing 10 having an inner conductor 11 and a bushing body 12 made of insulating hard plastic resin (e.g., epoxy resin) arranged to cover the outer peripheral surface of the inner conductor 11, a cable terminal part 20 of a power cable 50 attached to the bushing 10, and a metal adapter flange 30 having a flange opening 31 and relaying the connection between the bushing 10 and the equipment case 60. The bushing body 12 has a head part 121 on the tip side housed inside the equipment case 60 and a fixed flange 123 arranged on the rear end side of the head part 121, and the adapter flange 30 is fixed to the equipment case 60 so that the flange opening 31 communicates with the case opening 61, and the fixed flange 123 is fixed to the adapter flange 30.

According to the cable termination connection part 1, the bushing 10 is fixed to the equipment case 60 via the adapter flange 30, so that damage to the bushing due to distortion of the equipment case can be prevented, and the safety of the cable termination connection part 1 can be improved. Specifically, even if distortion occurs in the equipment case 60, the distortion of the equipment case 60 is absorbed by the adapter flange 30 and is not directly transmitted to the bushing body 12 (fixing flange ₁₂₃ ) of the bushing 10. Therefore, even if the insulation gas pressure is increased to ensure dielectric strength and distortion occurs in the equipment case 60, the bushing 10 will not be damaged, and it is also possible to cope with the case where an alternative gas to _SF6 gas (e.g., dry air, etc.) having lower insulation performance than SF6 gas is used as the insulation gas.

This can contribute to the promotion of environmentally friendly electric power equipment that does not use _SF6 gas. Therefore, it is possible to contribute to Goal 9 "Build resilient infrastructure, promote inclusive and sustainable industrialization and promote innovation" and Goal 13 "Take urgent action to combat climate change and its impacts" of the Sustainable Development Goals (SDGs), which are international goals aimed at a sustainable and better world by 2030 as stated in the "2030 Agenda for Sustainable Development" adopted at the United Nations Summit in September 2015. In addition, it can be used when it is necessary to use _SF6 gas at a higher gas pressure than before.

In addition, in the cable termination connection part 1, the fixing flange 123 is fixed to the rear end side surface (one side) of the adapter flange 30, and the tip side surface (the other side) is fixed to the equipment case 60. As a result, the outer size of the fixing flange 123 is not limited by the opening size (inner diameter R1) of the case opening 61 of the equipment case 60, so by adopting an adapter flange 30 of a size that fits the case opening 61 of the equipment case 60, the bushing 10 can be fixed to the equipment case 60 regardless of the case opening 61 of the equipment case 60 (one example of the specification of the interface between the bushing 10 and the power equipment), improving versatility. Furthermore, when attaching the bushing 10 to the equipment case 60 with the case opening 61 of a fixed size via the adapter flange 30, there is no need to match the outer size of the fixing flange 123 to the opening size of the case opening 61 of the equipment case 60, and the fixing flange 123 and therefore the bushing 10 can be made smaller.

Furthermore, in the cable termination connection part 1, the flange opening 31 can be inserted into the head part 121. This allows the bushing 10 to be easily fixed from the outside when attaching the bushing 10 to an existing equipment case 60 from the outside.

In addition, in the cable termination connection part 1, the opening size (inner diameter R1) of the case opening 61 is larger than the opening size (inner diameter R21) of the flange opening 31. This increases the distance between the center conductor (cable conductor 51) on the high-voltage side of the cable termination connection part 1 and the equipment case 60 on the ground side, thereby reducing the electric field applied to the bushing 10 and improving the electrical characteristics of the cable termination connection part 1. Furthermore, the bushing 10 can be easily inserted into the case opening 61, and damage to the bushing 10 due to contact with the equipment case 60 can be prevented, improving the ease of installation when fixing the bushing 10 to the equipment case 60.

In addition, a shielding portion is provided in the cable termination connection portion 1 at a portion corresponding to the flange opening 31 of the bushing 10. This prevents the electric field from concentrating inside the bushing body 12, and stabilizes the electrical characteristics of the bushing 10.

In addition, in the cable termination connection part 1, the bushing body 12 has a head part 121 that is housed inside the device case 60, and the flange opening 31 allows the head part 121 to be inserted through it.

The invention made by the inventor has been specifically described above based on the embodiment, but the invention is not limited to the above embodiment and can be modified without departing from the gist of the invention.

In the embodiment, the fixing flange 123 is fixed to the rear end surface of the adapter flange 30, and the front end surface is fixed to the device case 60, but the fixing manner of the adapter flange 30, the device case 60, and the fixing flange 123 is not limited to the form shown in the embodiment.

For example, the tip surface of the adapter flange 30 may be fixed to the device case 60, and the rear end surface of the fixed flange 123 may be abutted against the portion of the tip surface exposed from the case opening 61, thereby fixing the fixed flange 123 to the tip surface of the adapter flange 30. In other words, the outer peripheral surface of the fixed flange 123 faces the inner peripheral surface of the case opening 61 (device case 60). In this case, it is necessary to make the opening size of the flange opening 31 of the adapter flange 30 smaller than the opening size of the case opening 61 of the device case 60, and to make the outer size of the fixed flange 123 smaller than the opening size of the case opening 61.

For example, the rear end surface of the fixed flange 123 may be fixed to the front end surface of the adapter flange 30, and the rear end surface of the adapter flange 30 may be fixed to the front end surface of the equipment case 60 (i.e., fixed inside the equipment). In this case, the bushing 10 has a shape in which the rear end side of the fixed flange 123 passes through the flange opening 31 of the adapter flange 30 and the case opening 61 of the equipment case 60, or the fixed flange 123 is the rearmost end of the bushing 10, and only the power cable 50 and the cable terminal portion 20 pass through the flange opening 31 and the case opening 61 of the equipment case 60.

Also, the rear end surface of the adapter flange 30 may be fixed to the front end surface of the device case 60 (i.e., fixed inside the device), and the front end surface of the fixing flange 123 may be abutted against the portion of the rear end surface exposed from the case opening 61, thereby fixing the fixing flange 123 to the rear end surface of the adapter flange 30. In other words, the outer peripheral surface of the fixing flange 123 is positioned opposite the inner peripheral surface of the case opening 61 (device case 60).

In these cases, the adapter flange 30 is disposed inside the equipment case 60, so that at least the adapter flange 30 is fixed to the equipment case 60 when the power equipment is assembled.

In addition, in this embodiment, the bushing body 12 is formed of an epoxy bushing, i.e., the fixing flange 123 is formed of epoxy resin, but the fixing flange 123 may be formed of a hard insulator with high mechanical strength other than epoxy resin, such as fiber reinforced plastics (FRP). In this case, too, the same effect as in the case of an epoxy bushing (when the fixing flange 123 is made of epoxy resin) can be obtained.

The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is indicated by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims.

Reference Signs List 1 cable end connection part 10 bushing 11 inner conductor 12 bushing body 123 fixing flange 20 cable terminal part 30 adapter flange 31 flange opening 60 device case 61 case opening

Claims (4)

A cable termination connection part to be installed in a case opening of a device case of an electric power device,
a bushing having an internal conductor and a bushing body made of insulating hard plastic resin arranged to cover an outer circumferential surface of the internal conductor;
a cable terminal portion of a power cable to be attached to the bushing;
a metal adapter flange having a flange opening and relaying a connection between the bushing and the device case;
The bushing body has a head portion on a front end side that is accommodated inside the device case, and a fixing flange that is arranged on a rear end side of the head portion,
the adapter flange is fixed to the equipment case such that the flange opening communicates with the case opening;
The fixing flange is fixed to the adapter flange ,
A shielding portion is provided at a portion of the bushing corresponding to the flange opening.
Cable termination connection. The fixing flange is fixed to one surface of the adapter flange, and the other surface is fixed to the equipment case.
2. A cable termination according to claim 1. The opening size of the flange opening is smaller than the opening size of the case opening.
2. A cable termination according to claim 1. The hard plastic resin is an epoxy resin.
2. A cable termination according to claim 1.