KR20110079230A - Bus bar connection apparatus for gas insulated swichgear - Google Patents

Abstract

PURPOSE: A bus bar connecting device of a gas insulating switch is provided to block a connection area of a bus bar by a cover to prevent concentration of electric fields on an edge of a connection area, thereby obtaining high insulating performance. CONSTITUTION: A bus bar(145) is connected to a bushing(161). The bushing is coupled with the internal wall of an insulating tank(120). A coupling member(151) couples the bus bar with the bushing. A cover(170) surrounds the bus bar and the coupling member. The cover includes a first insulating unit(171) and a second insulating unit(181).

Description

Busbar connection device for gas insulated switch {BUS BAR CONNECTION APPARATUS FOR GAS INSULATED SWICHGEAR}

The present invention relates to a busbar connecting device of a gas insulated switchgear, and more particularly, to a busbar connecting device of a gas insulated switchgear to suppress electric field concentration.

As is well known, the electricity generated in a power plant is boosted to an ultra-high voltage suitable for power transmission and sent to the primary substation, where the voltage is dropped to the secondary substation or the customer.

Electric power supplied from the primary substation may be supplied to power receiving facilities of each consumer through distribution systems such as overhead distribution lines and underground distribution lines.

Meanwhile, a gas insulation switch (GAS INSULATED SWICHGEAR) may be used for line division, branching, and transformer primary protection of underground distribution lines.

1 is a perspective view showing the inside of a conventional gas insulated switch, FIG. 2 is an enlarged perspective view of a main part of FIG. 1, and FIG. 3 is an exploded perspective view of FIG. 2. As shown in FIG. 1, the gas insulated switch is an enclosure 10, an opening / closing and grounding unit 20 provided inside the enclosure 10, and an insulating tank surrounding the opening and closing unit 20. 30 may be provided.

The enclosure 10 may be formed in a substantially rectangular parallelepiped shape. The inner tank 10 may be provided with an insulating tank 30 having a reduced size compared to the outer box 10. The interior of the enclosure 10 may be partitioned into a plurality of spaces. One side (eg, the upper side) of the insulation tank 30 may be provided with a bus terminal 31 to which a bus bar is connected. In addition, a load terminal 33 connected to a load may be provided at the other side (eg, the bottom) of the insulating tank 30. The bus terminal 31 and the load terminal 33 may be provided with a bushing.

Meanwhile, the opening and closing unit 20 may be provided in the insulating tank 30. The opening and closing unit 20 includes a fixed contact table 21 having a fixed contact point, a moving arm (not shown) that rotates with respect to the fixed contact point 21, a slidable piston, and the piston slides. A cylinder 27 having a sliding contact formed therein, and a movable contact table 25 to which the cylinder 27 is rotatably coupled may be provided.

The fixed contact may include a current supply fixed contact 22 for supplying a current, and a ground fixed contact 23 for connecting the load side to ground. The moving arm may be connected to the opening and closing shaft to rotate when the opening and closing shaft is rotated. The moving arm may be connected to the piston to rotate the piston in three positions. Here, the three positions, the current supply position where the piston is connected to the fixed contact 22 for current supply, the ground position where the piston is connected to the fixed contact 23 for ground, and the piston is supplied with the current Positioned between the position and the ground position means a blocking position to cut off the current supply.

On the other hand, the bushing 40 of the bus terminal 31 or the load terminal 33 may be coupled to the inner wall of the insulating tank 30. In the insulating tank 30, a through hole 35 into which the bushing 40 is inserted, and a plurality of fastening holes 37 may be formed so that the bushing 40 may be fastened by a fastening member (not shown). Can be.

As shown in FIG. 2, one end of the bus bar 45 connecting the fixing contact and the bushing may be coupled to the bushing 40. A conductor 41 is provided at the center of the bushing 40, and a fastening bolt 47 for fastening the bus bar 45 may be screwed to the conductor 41. A plurality of washers 48 may be interposed between the bus bar 45 and the fastening bolt 47.

However, in such a conventional gas insulated switchgear, the edges of the busbars 45, the fastening bolts 47, the washers 48, and the like are sharply cut off when the high voltage power is applied. Field concentrations can occur at the edges. According to this structure, insulation breakdown between the inner surface and / or phase of the insulation tank 30 may occur. Due to this, it is necessary to secure a sufficient insulation distance, thereby increasing the size of the gas insulation switchgear.

Accordingly, an object of the present invention is to provide a busbar connecting device of a gas insulated switchgear which can suppress electric field concentration and reduce the external size of the gas insulated switchgear.

The present invention, in order to achieve the above object, a bushing; A busbar connected to the bushing; A fastening member for fastening the busbar to the bushing; And a cover surrounding the outside of the busbar and the fastening member.

The cover may include a first insulating part surrounding the bus bar and the fastening member and a second insulating part surrounding the end of the bushing.

The first insulation part may include a bus bar insertion hole into which the bus bar is inserted and a fastening member insertion hole into which the fastening member is inserted.

The cover may include a blocking cap that blocks the fastening member insertion hole.

The first insulating portion may be formed in a spherical shape.

It may be configured to further include a spacer interposed between the bushing and the bus bar.

The bushing may include a central conductor and an insulating portion surrounding the conductor, and the spacer may have a larger diameter than the conductor.

The conductor of the bushing may protrude from the insulator of the bushing, and the second insulator may include a shaft diameter portion that is reduced to enclose the protrusion of the conductor.

The spacer may be disposed in the first insulating portion.

An insulating material may be interposed between the second insulating portion and the bushing.

The insulating material may comprise insulating grease.

The cover may be formed of silicon (resin).

The bushing may be disposed inside the insulating tank.

An insulating material (for example, sulfur hexafluoride (SF ₆ ) gas) may be filled in the insulating tank.

As described above, according to an embodiment of the present invention, by blocking the connection area of the busbar with a cover, it is possible to suppress the concentration of the electric field in the corner portion of the connection area, etc., thereby securing a relatively high insulation performance. According to this, the separation distance from the inner wall of the phase or the insulating tank can be reduced in order to secure the insulating distance between the phases or busbars, it is possible to make a compact configuration. Thereby, the magnitude | size of the external appearance of a gas insulation switchgear can be reduced. In addition, when the gas insulation switchgear has the same appearance (size), it is possible to implement a gas insulation switchgear having a relatively high rated voltage.

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

4 and 5 are perspective views of a bus bar connection device of the gas insulated switchgear according to an embodiment of the present invention, respectively, FIG. 6 is an enlarged perspective view of the main part of FIG. 5, and FIG. 7 is a bus bar of FIG. 6. FIG. 8 is a cross-sectional view of FIG. 7 and FIG. 9 is an exploded perspective view of the busbar connecting device of FIG. 6. As shown in FIG. 4, an enclosure 110, an insulation tank 120 disposed inside the enclosure 110, an opening / closing and grounding unit 130 disposed inside the insulation tank 120, and A bus bar connecting device 160 according to an embodiment of the present invention may be provided to connect the bushing 161 and the bus bar 145.

The enclosure 110 may be formed of an approximately rectangular parallelepiped in which an accommodation space is formed. The inner space of the enclosure 110 may be partitioned into a plurality of spaces. An insulation tank 120 may be provided inside the enclosure 110. An opening and closing unit 130 may be provided inside the insulating tank 120. An insulating material, for example, sulfur hexafluoride (SF ₆ ) gas, may be filled in the insulating tank 120.

A plurality of first connection terminals 125 may be provided on an upper side of the insulating tank 120 in the inner space of the enclosure 110. The first connection terminal 125 may be connected to a bus bar (not shown).

A plurality of second connection terminals 127 may be provided in the lower region of the insulating tank 120. The second connection terminal 127 may be connected to a load (cable) (not shown).

The insulation tank 120 may be provided with an opening and closing unit 130 for opening and closing the power or grounding the load.

The opening and closing unit 130 has a fixed contact stage 131 having a plurality of fixed contacts, and a sliding contact to supply and cut off current, while grounding relative to the fixed contact stage 131, and a grounding function. It may be provided with a movable contact (135) and a movable arm (not shown) rotatably disposed on the fixed contact 131 to rotate the sliding contact.

The moving arm may be connected to the shaft 139. The moving arm may be rotated by the rotation of the shaft 139. The shaft 139 may extend to the front area of the enclosure 110. A mechanism part accommodating space 112 may be provided between the insulating tank 120 and the enclosure 110 to accommodate a mechanism part (not shown) for driving the shaft 139. As shown in FIG. 4, an operation handle connecting unit 114 to which an operation handle (not shown) for rotating the shaft 139 is connected may be provided on the front surface of the enclosure 110.

The fixed contact table 131 may include a plurality of fixed contacts 132 spaced apart from each other. One of the fixed contacts 132 may be a fixed contact 133 for current supply. The other one of the fixed contacts 132 may be a fixed contact 134 for grounding. The ground fixed contact 134 may be disposed at, for example, an upper region of the fixed contact table 131. The ground fixed contact 134 may be connected to the ground bus bar 140. The current supply fixed contact 133 may be disposed at, for example, a lower region of the fixed contact table 131.

The sliding contact may be formed on a piston (not shown) or a cylinder 137 that is elastically coupled to each other. That is, the cylinder 137 may be rotatably coupled to the movable contact table 135, and the piston may be elastically coupled to the cylinder 137. The piston may be moved to any one of the three positions while being coupled to the moving arm while rotating relative to the fixed contact table 131 by the rotation of the moving arm.

The movable contact table 135 may be electrically connected to each other by the first connection terminal 125 and the bus bar 141.

One end of the bus bar 145 may be connected to the fixed contact point 133 for supplying current, and the other end of the bus bar 145 may be connected to the second connection terminal 127 via a bushing 161. have. In this case, the second connection terminal 127 may include the bushing 161.

Meanwhile, the busbar connecting device 160 of the gas insulation switchgear includes a bushing 161, a busbar 145 connected to the bushing 161, and the busbar 145 with the bushing 161. It may be configured to include a fastening member 151 for fastening to the cover, and a cover 170 surrounding the outside of the bus bar 145 and the fastening member 151.

The bushing 161 may be coupled to an inner wall of the insulating tank 120. The bushing 161 may include a conductor 165 disposed in the center and an insulator 163 surrounding the conductor 165. A flange 164 extending along the radial direction may be formed in the central region of the insulator 163. The flange 164 may be formed in surface contact with the inner wall of the insulating tank 120. A through hole 122 may be formed in the insulating tank 120 to allow the insulator 163 to pass therethrough, and a fastening member 151 fastened to the flange 164 around the through hole 122. A plurality of fastening holes 124 may be formed to pass through the through hole. The conductor 165 of the bushing 161 may protrude from the end of the insulator 163.

The bus bar 145 may be electrically coupled to the conductor 165. The conductor 165 and the bus bar 145 may be fastened by the fastening member 151. An end of the bus bar 145 is penetrated to allow the fastening member 151 to pass therethrough. A female screw portion 166 may be formed at the end of the conductor 165 so that the fastening member 151 having the male screw portion may be screwed together. A washer 191 may be interposed between the fastening member 151 and the bus bar 145. The washer 191 may include a flat washer and / or a spring washer.

On the other hand, the cover 170 may be provided in the coupling area of the bus bar 145 and the fastening member 151 to cover the coupling area of the bus bar 145 and the fastening member 151. The cover 170 may be made of an insulating material. The cover 170 may be a silicone resin.

The cover 170 may include a first insulating portion 171 surrounding the bus bar 145 and the fastening member 151. As a result, the concentration of the electric field on the corners of the bus bar 145 and the fastening member 151 can be suppressed.

The cover 170 includes a first insulating portion 171 surrounding the bus bar 145 and the fastening member 151, and extends from the first insulating portion 171 to cover an end region of the bushing 161. It may be configured to include a second insulating portion 181 surrounding.

A bus bar insertion hole 173 into which the bus bar 145 is inserted may be formed in the first insulating portion 171. The busbar insertion hole 173 may be formed through the side surface of the first insulating portion 171. A fastening member insertion hole 175 may be formed in the first insulating portion 171 to allow the fastening member 151 to be inserted therein. The fastening member insertion hole 175 may be formed through the end of the first insulating portion 171.

The fastening member insertion hole 175 may be provided with a blocking cap 177 for blocking the fastening member insertion hole 175. The blocking cap 177 may be formed of an insulating member. The blocking cap 177 may be formed to open and close the fastening member insertion hole 175. The blocking cap 177 may be connected to or separated from the first insulation portion 171. The blocking cap 177 may be sealed using a sealing member (material) or the like after insertion of the fastening member 151.

The first insulating portion 171 may have a spherical shape having a round shape.

One side of the first insulating part 171 may have a second insulating part 181 extending to cover the end region of the bushing 161. The second insulating portion 181 may be formed in a cylindrical shape corresponding to the end shape of the bushing 161 to accommodate the end region of the bushing 161. An insulating material may be interposed between the bushing 161 and the second insulating portion 181. More specifically, an insulating material, for example, an insulating grease may be applied to the outer surface of the bushing 161 and / or the inner surface of the second insulating portion 181.

A radially reduced diameter portion 183 may be provided between the first insulating portion 171 and the second insulating portion 181 in the radial direction. The shaft diameter portion 183 surrounds the conductor 165 protruding from the insulator 163 of the bushing 161 when the cover 170 is coupled.

Meanwhile, a spacer 195 may be disposed between the conductor 165 of the bushing 161 and the bus bar 145. The spacer 195 may be formed to have an expanded width (diameter) compared to the conductor 165. As a result, when the fastening member 151 is fastened, the second insulating portion 181 may be pressed by the spacer 195 to prevent the second insulating portion 181 from being separated from the bushing 161. Can be. The spacer 195 may be formed to have a circular shape. A through hole 196 may be formed at the center of the spacer 195 to allow the fastening member 151 to pass therethrough. The spacer 195 may be formed of an insulating material (for example, silicone resin).

In this configuration, when the bus bar 145 is to be connected to the bushing 161, first, the second insulating portion 181 of the cover 170 is coupled to the end of the bushing 161. In this case, insulating grease may be applied to the bushing 161 or the second insulating portion 181.

Next, an end portion of the bus bar 145 is inserted into the bus bar insertion hole 173 of the first insulating portion 171. A washer (flat washer and spring washer) is coupled to the fastening member 151. The spacer 195 is coupled to the fastening member 151. Here, the spacer 195 may be inserted into the first insulating portion 171 first through the fastening member insertion hole 175.

The fastening member 151 is inserted through the fastening member insertion hole 175, and the fastening member 151 is coupled to the conductor 165. Next, the blocking cap 177 is coupled to the fastening member insertion hole 175. Here, after the coupling of the blocking cap 177 may be sealed by applying a sealing member (material) such as silicon to the coupling region of the blocking cap 177 and the fastening member insertion hole 175.

In the above, specific embodiments of the present invention have been shown and described. However, the present invention can be embodied in various forms without departing from the spirit or essential features thereof, so the embodiments described above should not be limited by the details of the detailed description.

Further, even when the embodiments not listed in the detailed description have been described, it should be interpreted broadly within the scope of the technical idea defined in the appended claims. It is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

1 is a perspective view of a conventional gas insulated switchgear,

2 is an enlarged perspective view of the main part of FIG. 1;

3 is an exploded perspective view of FIG. 2;

4 and 5 are respectively a perspective view of the use state of the busbar connecting device of the gas insulated switchgear according to an embodiment of the present invention,

6 is an enlarged perspective view of the main part of FIG. 5;

7 is a side view of the busbar connecting device of FIG. 6;

8 is a cross-sectional view of FIG.

9 is an exploded perspective view of the busbar connecting device of FIG. 6.

Explanation of symbols on the main parts of the drawings

110: enclosure 120: insulated tank

130: opening and closing unit 145: busbar

151: fastening member 160: busbar connecting device

161: bushing 170: cover

171: first insulation 173: busbar insertion hole

175: fastening member insertion hole 177: blocking cap

181: second insulation portion 183: shaft diameter portion

Claims (12)

bushing; A busbar connected to the bushing; A fastening member for fastening the busbar to the bushing; And And a cover surrounding the outside of the busbar and the fastening member. The method of claim 1, The cover is a bus bar connection device of the gas insulated switchgear comprising a first insulating portion surrounding the bus bar and the fastening member and a second insulating portion surrounding the end of the bushing. The method of claim 2, Bus bar connection device of the gas insulated switchgear, characterized in that the first insulating portion, the bus bar insertion hole into which the bus bar is inserted and the fastening member insertion hole into which the fastening member is inserted. The method of claim 3, The cover is a bus bar connection device of the gas insulated switch characterized in that it has a blocking cap for blocking the fastening member insertion hole. The method of claim 2, Bus bar connection device of the gas insulated switch, characterized in that the first insulating portion is spherical. The method of claim 2, Bus bar connection device of the gas insulated switch further comprising a spacer interposed between the bushing and the bus bar. The method of claim 6, The bushing has a central conductor and an insulation portion surrounding the conductor, and the spacer has a larger diameter than the conductor, wherein the busbar connecting device of the gas insulated switchgear is provided. The method of claim 7, wherein The conductor of the bushing protrudes from the insulator of the bushing, and the second insulator includes a shaft diameter portion that is reduced to enclose the protrusion of the conductor. The method of claim 8, The spacer is a bus bar connection device of the gas insulated switch, characterized in that disposed in the first insulating portion. The method of claim 2, Bus bar connection device of the gas insulated switch, characterized in that the insulating material is interposed between the second insulating portion and the bushing. The method of claim 10, Bus bar connection device of the gas insulated switch, characterized in that the insulating material comprises a grease. The method according to any one of claims 1 to 11, Bus cover connecting device of the gas insulated switchgear characterized in that the cover is formed of silicon.

Images