Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01C—RESISTORS
  • H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
  • H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01C—RESISTORS
  • H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
  • H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
  • H01C7/12—Overvoltage protection resistors
  • H01C7/126—Means for protecting against excessive pressure or for disconnecting in case of failure
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01C—RESISTORS
  • H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
  • H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
  • H01C7/102—Varistor boundary, e.g. surface layers

Definitions

• the present invention relates to an arrester provided with a laminate (hereinafter referred to as "arrestor element laminate”) of a plurality of non-linear resistance elements (hereinafter referred to as “arrestor elements”) mainly composed of zinc oxide.
• the present invention relates to an arrester that can secure the surface pressure at the interface between the insertion hole of the bushing and the rubber mold body including the arrester element laminate and prevent the generation of voids.
• gas-insulated switchgears installed at power plants, substations, etc. are provided with arresters to protect electrical devices such as switchgears and transformers from abnormal voltages that enter from the track during lightning strikes. It is installed.
• the arrester element stack body 100 is erected on the bottom 1 1 0 a of the tank 1 1 0 a in which an insulating gas is sealed.
• a bushing 2 2 0 is airtightly attached to the inner wall of the device case 2 10, and is supported by a support cylinder 1 2 0 (for example, Non-Patent Document 1).
• a structure in which an arrester element laminate 2 30 is detachably attached to a pushing 2 20 is known (for example, Patent Document 1).
• reference numeral 140 denotes an eccentric shield on the high-pressure side
• 150 denotes an insulating spacer
• 160 denotes an instrument box
• 170 denotes an adsorbent.
• the structure is simplified because it is not necessary to provide a separation device, and the insulation gas in the device case 210 is collected or filled when performing a withstand voltage test.
• the device case 2 10 as a grounding body exists on the outer periphery of a part of the arrester element laminate 2 3 0, the voltage sharing of the arrester element 2 3 0 a is possible. Therefore, it was difficult to make the voltage uniform, so that its application was limited to medium-voltage lines of about 2 2 Z 3 3 kV.
• the arrester mold body 3 4 0 is provided on the outer periphery of the arrester element stack body 3 5 0 formed by stacking a plurality of arrester elements 3 5 0 a and the arrester element stack body 3 5 0. And a rubber mold body made of silicone rubber. Further, the pushing 3 2 0 for receiving the rubber mold body 3 60 is a insertion hole (hereinafter referred to as “tip insertion hole”) for accommodating the cylindrical tip 3 4 0 a of the arrester mold 3 4 0.
• 3 2 1 a closed upper end cylindrical part (hereinafter referred to as “front end cylindrical part”) 3 2 1 and the columnar rear end 3 4 Ob of arrester mold body 3 4 0 3 2 2 and the center part of the arrester mold body 3 4 0 (hereinafter referred to as “rear end insertion hole”) 3 2 2
• a cylindrical portion having a tapered insertion hole (hereinafter referred to as “taper insertion hole”) 3 2 3 a (hereinafter referred to as “intermediate cylindrical portion”). 3) With 3 2 and 3.
• the arrester motor Since the entire body 3 4 0 is accommodated in the insertion hole 3 3 0 of the pushing 3 2 0, it can be applied to a line with a higher voltage class than the conventional arrester.
• the body 3 60 When the body 3 60 is pressed toward the tip of the pushing 3 2 0, the tapered inner surface of the tapered insertion hole 3 2 3 a of the pushing 3 2 0 and the conical part constituting the rubber mold 3 6 0 The surface pressure between the tapered outer surfaces of 3 4 0 c is secured.
• a spring 3 70 is disposed at the rear end portion of the arrester mold body 3 4 0, and the spring 3 3 0 is spring-sealed by a seal lid 3 90 disposed at the rear end portion of the pushing 3 2 0.
• the tapered outer surface of the rubber molded body 3 60 is formed into the tapered insertion hole 3 2 3 a of the taper insertion hole 3 2 3 a.
• the insulating performance of the interface between the tapered outer surface of the rubber mold body 3 60 and the tapered inner surface of the bushing 3 2 0 and the tapered inner surface of the pushing 3 2 3 a is secured. Will be.
• Non-Patent Document 1 IEEJ Technical Report No. 8 5 1 1 (Fig. 2, 1 0)
• Patent Document 1 JP-A-1-2 3 2 6 8 1 (Fig. 1)
• the present invention has been made to solve the above-mentioned problems, and by ensuring the surface pressure at the interface between the insertion hole of the pushing and the rubber mold body, the generation of voids is prevented.
• the purpose of the present invention is to provide an arrester that can suppress the occurrence of partial discharge at the interface.
• An arrester includes a pushing disposed in an opening of a device case that houses an electric device so as to cover the opening in an airtight manner, and a device case in a insertion hole of the pushing.
• the arrester mold body is detachably mounted from the outside of the arrester.
• the arrester mold body includes an arrester element laminate formed by laminating a plurality of arrester elements, and a rubber mold provided on the outer periphery of the arrester element laminate.
• the outer periphery of the tip of the arrester element stack is covered with a high-pressure shield body, and spreads in a conical shape from the high-pressure side of the bushing toward the low-pressure side in the region where the electric field of the insertion hole of the pushing is concentrated
• a taper inner surface is provided, and the rubber mold body is provided with a taper outer surface that fits into the taper inner surface.
• the arrester according to the second aspect of the present invention includes a pushing member disposed in an opening of a device case that accommodates an electric device so as to cover the opening in an airtight manner, and a device case in the insertion hole of the pushing.
• the arrester mold body is detachably mounted from the outside of the arrester.
• the arrester mold body includes an arrester element laminate formed by laminating a plurality of arrester elements, and a rubber mold provided on the outer periphery of the arrester element laminate.
• the outer periphery of the tip of the arrester element stack is covered with a high-pressure shield body, and the push-in insertion hole has a high pressure from the part corresponding to the vicinity of the low-pressure direction end of the high-pressure shield body.
• a tapered inner surface that extends conically from the high-pressure side to the low-pressure side of the bushing is provided in the section that reaches the part corresponding to the vicinity of the side surface. Those tapered outer surface which fits are found provided with.
• the arrester according to the third aspect of the present invention includes a pushing disposed in an opening of a device case that houses an electric device so as to cover the opening in an airtight manner, and a device case in a insertion hole of the pushing.
• the arrester mold body is detachably mounted from the outside of the arrester.
• the arrester mold body includes an arrester element laminate formed by laminating a plurality of arrester elements, and a rubber mold provided on the outer periphery of the arrester element laminate.
• the outer periphery of the tip of the arrester element stack is covered with a high-pressure shield body, and the insertion hole of the bushing is located near the high-pressure side of the equipment case from the part corresponding to the middle part of the high-pressure shield body.
• a tapered inner surface that extends conically from the high-pressure side to the low-pressure side of the bushing is provided over the section to the corresponding part, and the rubber mold body has a tapered outer surface that fits into the tapered inner surface.
• An arrester includes a pusher disposed in an opening of a device case that houses an electric device so as to cover the opening in an airtight manner, and a device case in a insertion hole of the pushing.
• the arrester mold body is detachably mounted from the outside of the arrester.
• the arrester mold body includes an arrester element laminate formed by laminating a plurality of arrester elements, and a rubber mold provided on the outer periphery of the arrester element laminate.
• the outer periphery of the tip of the arrester element laminate is covered with a high-pressure shield body, and the insertion hole of the bushing corresponds to the vicinity of the high-pressure side of the equipment case from the part corresponding to the top of the high-pressure shield body.
• a tapered inner surface that extends conically from the high pressure side to the low pressure side of the bushing is provided over the section leading to the part. Mel in what path outer surface is provided.
• An arrester includes a pushing disposed in an opening of a device case that houses an electric device so as to cover the opening in an airtight manner, and a device case in the insertion hole of the pushing.
• the arrester mold body is detachably mounted from the outside of the arrester.
• the arrester mold body includes an arrester element laminate formed by laminating a plurality of arrester elements, and a rubber mold provided on the outer periphery of the arrester element laminate.
• the outer periphery of the tip of the arrester element stack is covered with a high-pressure shield body, and the insertion hole of the bushing has a low pressure from the high-pressure side of the bushing to the section from the tip of the bushing to the rear end of the bushing.
• a tapered inner surface that is conically widened toward the side is provided, and the rubber mold body is provided with a taper outer surface that fits into the tapered inner surface.
• a sixth aspect of the present invention is any one of the first to fifth aspects.
• the arrester In the arrester,
• the arrester mold body includes an arrester element laminate formed by stacking a plurality of arrester elements mainly composed of zinc oxide, a connection conductor in contact with the high voltage side of the arrester element laminate, and an arrester element laminate. And a pressing metal fitting abutted on the low pressure side.
• a seventh aspect of the present invention is any one of the first aspect to the sixth aspect.
• the rear end portion of the arrester mold body passes through the opening of the equipment case, and the equipment case It has been derived outside.
• An eighth aspect of the present invention is any one of the first aspect to the seventh aspect.
• the rear end of the bushing is formed of an insulating cylindrical member, and the cylindrical member Passes through the opening of the device case and is led out of the device case.
• a ninth aspect of the present invention is the arrester according to any one of the first to eighth aspects, wherein the pushing is made of a hard plastic resin.
• the arrester according to the first to ninth aspects of the present invention has the following effects.
• the arrester mold body is detachably attached from the outside of the device case to the pushing that is airtightly arranged in the opening of the device case, as in the conventional gas-insulated arrester, It is no longer necessary to provide a separation device, so that the structure of the equipment can be simplified, and there is no need to recover and fill the insulation gas in the equipment case when replacing the arrester element. Can be used.
• the structure of the equipment can be simplified, downsized, and reduced in weight.
• FIG. 1 is a partial longitudinal sectional view of an arrester according to a first embodiment of the present invention.
• FIG. 2 is an equipotential distribution diagram of the arrester in the first embodiment of the present invention.
• FIG. 3 is a partial longitudinal sectional view of an arrester in a second embodiment of the present invention.
• FIG. 4 Partial sectional view of a conventional arrester.
• FIG. 5 is a partial sectional view of a conventional arrester.
• FIG. 6 is a partial cross-sectional view of a conventional arrester.
• FIG. 7 is an equipotential distribution diagram in which the equipotential line spacing near the high-voltage shield body shown in FIG. 6 is 5 kVZmm.
• FIG. 8 is an equipotential distribution diagram in which the equipotential line spacing near the ripple junction shown in FIG. 6 is 1 kV Zmm.
• the “tips” of the bushing, arrester mold body, arrester element laminate, and high-pressure shield body refer to the pushing, arrester mold body, arrester element laminate, and high-pressure shield body, respectively. This is the end of the high pressure side, and corresponds to the upward direction in the figure.
• the bushing, arrester mold body, arrester element laminate, and high-voltage shield body ⁇ rear end are the ends opposite to the front end, and correspond to the downward direction in the figure.
• FIG. 1 is a partial cross-sectional view showing an example of a 6 6 Z 7 7 kV class arrester of the present invention.
• an electric device having the arrester of the present invention includes a device case 1 that hermetically accommodates an electric device (not shown) such as a switch, and the device case 1 includes, for example, SF 6 Insulating gas such as gas is filled.
• an opening 1 a is provided at the bottom of the device case 1, and the opening 1 a has its own leading end positioned in the device case 1 and an opening at the middle of itself.
• a bushing 2 is disposed so as to hermetically cover a, and an arrester mold body 6 described later is detachably mounted in the pushing 2.
• the bushing 2 includes a hard and insulating bushing body 3 made of an epoxy resin mold body and the like, and a high-pressure shield body 4 embedded concentrically with the bushing body 3 at the tip of the bushing body 3. I have.
• the pushing body 3 is provided with a insertion hole 3a for accommodating the arrester mold body 6, and in the region where the electric field of the insertion hole 3a is concentrated, from the high pressure side to the low pressure side of the pushing 2 A tapered inner surface is formed that extends in a conical shape.
• the pushing body 3 has a insertion hole (hereinafter referred to as a ⁇ tip insertion hole) for accommodating the tip of the arrester mold body 6 (the length of the entire arrester mold body 6 is approximately 1 Z 10).
• 5 1 a closed upper end cylindrical portion (hereinafter referred to as “front end cylindrical portion”) 5 1 and rear end portion of arrester mold body 6 (about 2 Z 5 of arrester mold body 6 as a whole)
• Length 2 cylindrical hole (hereinafter referred to as “rear end insertion hole”) 5 2 a cylindrical portion (hereinafter referred to as “rear end cylindrical portion”) 5 2 and arrester mold body
• An insertion hole (hereinafter referred to as “taper insertion hole”) as a taper inner surface for accommodating an intermediate portion excluding the front end portion and rear end portion of 6 (a length of about 1 Z 2 of the entire arrester mold body 6).
• Cylindrical part with 5 3 a (hereinafter referred to as “intermediate cylindrical part”) 5 3
• a hexagonal plate-like mounting flange 5 2 b is connected to the outer periphery of the upper portion of the part 52 so as to protrude in a direction perpendicular to the axis of the pushing 2.
• the diameter of the rear end insertion hole 5 2a is larger than the diameter of the front end insertion hole 51a, and the tapered insertion hole 53a is a bushing.
• 2 has a tapered inner surface that expands in a conical shape from the high-pressure side (front end) to the low-pressure side (rear end). The rear end insertion hole 5 2 a is communicated.
• the outer diameter of the mounting flange 5 2 b is larger than the diameter of the opening 1 a of the equipment case 1, and there is a port through hole h near each corner of the mounting flange 5 2 b. 1, h2 ⁇ are provided.
• the high-pressure shield body 4 is embedded in the tip cylindrical portion 51 so as to be concentric with the tip cylindrical portion 51 from the closed portion 51b to the rear end of the tip cylindrical portion 51.
• a bell-shaped shield body 4 1, a cylindrical part projecting above the closing part 5 1 b at the center of the horizontal part of the shield body 4 1 (hereinafter referred to as “connection conductor insertion part”) 4 2 and connection conductor ⁇ A main circuit connector 43 connected to a main circuit conductor (not shown) connected to the upper part of the inlet 42 is provided.
• the side wall portion 4 1 a of the shield body 4 1 is formed so as to expand in a conical shape from the front end portion to the rear end portion, and the length in the axial direction is 1 Z 3 of the entire pushing body 3.
• the substantially intermediate portion of the taper insertion hole 5 3 a is located at the portion E ′ corresponding to the low-pressure direction end E of the side wall portion 4 1 a of the shield body 4 1 a. .
• connection conductor insertion part 42 has a function as an insertion hole of the connection conductor 62, which will be described later, of the arrester mold body 6, and is connected to the main circuit provided at the tip of the connection conductor insertion part 42.
• the child 43 also has a function as a stopper of a coiled spring 63 described later of the arrester mold body 6.
• the high-voltage shield body 4 having such a configuration includes a main circuit connector 43 and a tip cylindrical portion.
• the front end cylindrical portion 51 and the intermediate cylindrical portion 53 of the pushing 2 are located in the device case 1, and the rear end cylindrical portion 52 is the opening 1a.
• the upper surface of the mounting flange 5 2 b can be brought into contact with the lower surface of the peripheral edge portion of the opening 1 a of the device case 1 by leading it out of the device case 1. Therefore, in the pushing 2 having such a configuration, the opening of the device case 1
• the arrester mold body 6 includes an arrester element laminated body 6 1 formed by laminating a plurality of arrester elements 6 1a mainly composed of zinc oxide, and the tip side of the arrester element laminated body 61.
• Connection conductor 6 2 disposed on the high voltage side
• a coiled spring (hereinafter referred to as “high pressure side spring”) 6 3 disposed on the tip side (high voltage side) of the connection conductor 62
• Arrester element laminated body 6 1 Presser fitting 6 5 arranged on the rear end side (low pressure side) and coil-like spring (hereinafter referred to as “low pressure spring” And 6) and a rubber mold body 6 7 made of silicone rubber or the like integrally molded across the connection conductor 62 and the pressing bracket 65 on the outer periphery of the arrester element laminate 61.
• the outer surface of the rubber mold 67 is formed so as to correspond to the inner surface of the insertion hole 3 a of the pushing 2.
• the outer surface of the rubber mold 67 is formed so as to correspond to the inner surface of the insertion hole 3 a of the pushing 2.
• the front end side (high pressure side) of the rubber mold body 6 7 there is a cylindrical front end portion 6 7 a corresponding to the inner surface of the front end insertion hole 51 a, and the rear end side (low pressure side).
• a conical portion 6 7 b corresponding to the tapered inner surface of a is provided.
• the number of arrester elements 6 1 a corresponding to the system voltage is determined in consideration of a predetermined varistor voltage. This embodiment can be applied to a 66 kV high-voltage line.
• the connecting conductor 6 2 includes a disk portion 6 2 a that is substantially the same shape as the arrester element 6 1 a in contact with the high-voltage side of the arrester element multilayer body 61, and the center of the upper surface of the disk portion 6 2 a. And a cylindrical portion 6 2 b projecting upward, and a tape-shaped conductor connector (multi-contact contact) (not shown) is fitted on the outer periphery of the cylindrical portion 6 2 b. An annular groove 6 2 c is provided.
• the press fitting 65 includes an annular member 65a having a diameter slightly smaller than the outer diameter of the rear end side (low pressure side) of the rubber mold body 67, and the annular member 65a In the center of the upper surface, there is a disk-shaped pressing portion 65 b that is substantially the same shape as the arrester element 61 a, and, for example, 12 recessed portions 65 c in the circumferential direction are located near the outer periphery on the lower surface side. It is provided so as to be evenly distributed along.
• 6 5 d is, for example, four screw holes provided so as to be equally distributed along the circumferential direction on the inner peripheral side of the annular member 65 a
• 65 e is a lower surface of the annular member 65 a
• a large-diameter recess hereinafter referred to as a “large-diameter recess”
• the arrester element laminate 61 On the outer periphery of the arrester element laminate 61 having such a configuration, the lower surface of the disk portion 6 2a of the connection conductor 62 is brought into contact with the front end portion thereof, and the pressing metal 65 is pressed against the rear end portion.
• a rubber mold body 6 7 such as silicone rubber is provided across the upper surface of the disk portion 6 2 a of the connection conductor 62 and the outer periphery of the pusher 65 in a state where the portion 65 b is in contact.
• the arrester element laminate 6 1 is integrated with the connection conductor 6 2 and the pressing metal 6 5 by the rubber mold body 6 7.
• the seal lid F has its own upper surface (the side opposite to the bushing 2), and a cylindrical boss F a that can be inserted into and connected to the large-diameter recess 6 5 e of the metal fitting 65.
• eight port through holes are provided so as to be equally distributed along the circumferential direction, and further, an O-ring P is provided on the upper surface side.
• An annular groove (not shown) for receiving 2 is provided concentrically with the rear end insertion hole 5 2 a of the bushing, and an annular groove ( (Not shown) is provided, and a tape-shaped conductor connector (not shown) is fitted in the annular concave groove.
• the symbol V 3 indicates a port for attaching a grounding wire (not shown).
• the outer peripheral surface of the tip 6 7 a of the body 6 7 is the inner peripheral surface of the tip 2 insertion hole 5 1 a of the bush 2, and the outer peripheral surface of the conical portion 6 7 b of the rubber mold body 6 7 is the push 2
• the outer peripheral surface of the rubber mold body 6 7 is in contact with the inner peripheral surface of the rear end insertion hole 52a on the inner peripheral surface of the taper insertion hole 53a. .
• a coiled low-pressure spring 66 having a diameter substantially the same as the inner diameter of the recessed portion 65c is attached to the recessed portion 65c of the pressing metal 65 so that the lower half of the spring protrudes.
• an O-ring P 2 made of fluoro rubber or the like is disposed in the concave groove F 2 a.
• the seal lid F is brought into contact with the lower surface of the cylindrical portion 52 of the rear end portion of the bushing 2, and further Screw the tip of the porch V 2 threaded through the port lid F hole of the handle lid F into the embedded fitting N embedded in the lower surface of the rear end cylindrical part 5 2.
• the seal lid F is attached to the lower surface of the rear end cylindrical portion 52.
• the high-pressure side spring 63 disposed at the front end portion of the rubber mold body 6 7 is pressed in the axial direction.
• a predetermined panel force is applied to the high-pressure side spring 6 3, and this causes the arrester element 6 1 a to be connected to the connecting conductor 6 2, between the arrester element 6 1 a.
• a predetermined surface pressure is applied between the arrester element 61a and the pressing part 65b, so that these members are surely in contact with each other.
• the arrester mold body As described above, according to the arrester having such a configuration, the arrester mold body
• a spring is disposed at the rear end of the arrester mold body, and the spring force is urged against the spring, so that the arrester mold body can be pressed toward the tip of the bushing.
• the axial pressing force effectively acts as the surface pressure.
• the surface pressure can be made.
• a tapered insertion hole 53 a (conical portion 6 7 b) in which the surface pressure acts effectively inside the low-pressure direction end E of the high-pressure shield body where the electric field is concentrated, as described later. The generation of partial discharge at the interface portion can be suppressed.
• FIG. 2 shows an equipotential distribution diagram of the arrester in the present example.
• the tip of the arrester mold body 6 is shielded by the high-pressure shield body 4, and the rear end of the arrester mold body 6 is disposed outside the device case 1 as a grounding body.
• the voltage shared by the arrester element 61a is controlled in the longitudinal direction by adjusting the distance between the high-voltage shield body 4 and the equipment case 1 as a grounding body. To be uniform.
• the influence of the shield body 41 and the device case 1 as the grounding body on the arrester mold body 6 will be described.
• the electric field in the middle part of the rear resta mold body 6 is affected by the influence of the shield body 4 1 and the equipment case 1.
• the distance between the two is widened, There is a relationship that the electric field is sparse. Therefore, it is difficult to make the voltage sharing of the arrester element 61 1 a uniform only by simply increasing the distance between the two.
• the tip end portion of the arrester mold body 6 (about 1 Z 3 length of the arrester mold body 6) and the intermediate portion (length of about 1 Z 3 of the arrester mold body 6) are By positioning the rear end of the arrester mold body 6 (about 1 Z 3 length of the arrester mold body 6) outside the case 1 of the device, The distance from the device case 1 is adjusted appropriately, the electric field in the middle part of the arrester mold body 6 can be controlled appropriately, and the voltage sharing of the arrester element 6 1 a can be made uniform. .
• the arrester mold body 6 can be detachably mounted from the outside of the equipment case 1 in the bushing 2 that is airtightly attached to the opening 1 a of the equipment case 1. Therefore, it is no longer necessary to provide a separation device as in the case of conventional gas-insulated arresters, so that the structure of the equipment can be simplified, and the insulating gas in the equipment case 1 can be removed when replacing the arrester element. The work of collecting or filling can be made unnecessary.
• the voltage sharing of the arrester element 61a can be made uniform, and as a result, the 6 6/7 7 kV class high voltage Arrestors that can also be applied to the track can be provided, and by reducing the rear end side (low pressure side) of the arrester mold body 6 to the outside of the device case 1, the size of the device can be reduced.
• the insertion hole 3a of the bushing 2 has a high pressure as viewed from the part S ′ corresponding to the top S of the high-pressure shield body 4, that is, from the part E ′ corresponding to the low-pressure end E of the high-pressure shield body 4.
• a taper insertion hole 5 3 a is provided from the part S ′ located on the side (tip side) to the part 1 ′ corresponding to the vicinity of the high pressure side surface of the equipment case 1 and the rubber mold body 6 7 is tapered. Since the conical portion 6 7 b that fits into the insertion hole 5 3 a is provided, the surface pressure at the interface between the insertion hole of the bushing and the rubber mold body is ensured in the region where the electric field is concentrated. Generation of voids And, in turn, the occurrence of partial discharge at the interface between the two can be suppressed.
• FIG. 3 shows a partial sectional view of the arrester in the second embodiment of the present invention.
• parts common to those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.
• FIG. 3 in this embodiment, instead of the insertion hole 3a of the bushing shown in FIG. 1, the pressure of the bushing is increased from the front end of the bushing 2 to the rear end of the bushing 2.
• the taper insertion hole 5 3 a ′ that conically extends from the side toward the low pressure side is provided, and the rubber mold body 6 7 has a conical portion that fits into the inner surface of the taper insertion hole 5 3 a ′. 6 7 b 'is provided.
• the structure of the device can be simplified, and the device case 1 can be used when replacing the arrester element. This eliminates the need to collect or fill the insulating gas inside. Furthermore, since the voltage sharing of the arrester element 61a can be made uniform, an arrester applicable to a 6 6 Z 7 7 kV class high-voltage line can be provided, and a part of the arrester mold body 6 can be provided. By reducing the (low-pressure side) to the outside of the equipment case 1, the equipment can be reduced.
• a taper insertion hole 5 3 a ′ is provided in the entire region from the tip of the bushing to the rear end of the bushing so that the conical portion 6 7 b ′ of the arrester mold body 6 is fitted to this. Because of this construction, it is possible to ensure the surface pressure at the interface between the two over the entire length of the arrester mold body 6 and prevent the formation of voids, and thus provide an arrester with better insulation performance than the previous embodiment. can do.
• a bushing is arranged at the bottom of the device case 1.
• a pushing may be provided on the side wall of the device case 1.
• the bushing is subjected to a section extending from a portion corresponding to the top of the high-pressure shield body to a portion corresponding to the vicinity of the high-pressure side surface of the device case, or from the high-pressure side of the pushing to the low-pressure side.
• a tapered insertion hole is provided that expands in a conical shape toward the side, but it corresponds to the vicinity of the high-pressure side of the equipment case from the portion corresponding to the vicinity of the low-pressure end of the high-pressure shield From the part corresponding to the middle part of the high-pressure shield body to the part corresponding to the vicinity of the high-pressure side of the equipment case in a conical shape from the high-pressure side to the low-pressure side.
• An expanding taper insertion hole may be provided.

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• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• Thermistors And Varistors (AREA)
• Gas-Insulated Switchgears (AREA)

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