JP5274416B2 - Insulated operation rod - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an insulation operating rod of long life and with high reliability. <P>SOLUTION: The insulation operating rod is provided with a coupling rod charged in high voltage, an insulation rod of a resin laminated body, a connecting pin inserted into the insulation rod in a lamination direction of the resin laminated body for connecting the insulation rod to the coupling rod, and an insulator endowed with a volume resistivity higher than that of the insulation rod along a layer direction, fitted between the connecting pin and the insulation rod, for preventing contact of a layer direction end face of the insulation rod with the connecting pin. Thus, by providing the insulator between the connecting pin and the insulation rod, movement of electric charge to the insulation rod can be delayed to lessen a rising rate of an electric field, so that discharge can be restrained. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an insulating operating rod, and more particularly to an insulating operating rod suitable for opening and closing by connecting a movable contact to an operating mechanism in a gas insulated circuit breaker.

  In the conventional insulating operation rod, the glass fiber reinforced plastic (hereinafter referred to as FRP) constituting the insulating operation rod is low on the surface of the FRP in order to prevent a decrease in dielectric strength due to unbalanced resistivity. A coating of resistivity chromium oxide is applied. By providing such a low-resistivity coating layer, the current that has flowed through the fiber population through which current can easily flow can be transferred to the coating layer to have a uniform distribution. As a result, a situation in which electric charges are accumulated at the end of the fiber group does not occur, and disturbance of the electric field distribution due to charging does not occur, so that it is possible to prevent a decrease in dielectric strength against DC voltage. (For example, refer to Patent Document 1).

Japanese Unexamined Patent Publication No. 2000-11823 (paragraph 0007, FIG. 1)

  In such a conventional insulating operation rod, the joint is connected so as to wrap the end portion of the insulating rod by screwing, so that the outer shape of the joint is larger than that of the insulating operation rod. It was necessary to increase the inner diameter of the pressure vessel to be stored. Further, in order to secure the connection strength between the insulating rod and the joint, long screw screwing is required, and it is necessary to apply an adhesive to prevent the screw part from loosening, which makes the processing and assembly complicated. In addition, variations in mechanical strength may occur due to variations during assembly. Furthermore, in order to make the resistance of the coating layer constant, it is necessary to strictly manage the coating film thickness.

  The present invention has been made in order to solve the problems that occur in the structure of such a conventional insulating rod, and has a simple structure that does not have a low-resistivity coating layer, and is reliable. The purpose is to obtain a high insulation operating rod.

  The insulating operating rod according to the present invention is connected to the connecting rod, the connecting rod being charged at a high voltage, the insulating rod of the resin laminate, and the insulating rod inserted in the stacking direction of the resin laminate. The connection pin has a volume resistivity higher than the volume resistivity in the creeping direction of the insulating rod, and is provided between the connection pin and the insulating rod, and is formed between the creeping end face of the insulating rod and the connection pin. An insulator for preventing contact is provided.

  According to the present invention, an insulating operating rod having a simple structure in which the insulating operating rod and the connecting rod are coupled by the connection pin can be obtained with an insulating operating rod having reliability equal to or higher than that of the conventional one.

It is a schematic sectional side view which shows 1st Embodiment of the insulation operating rod of this invention. It is a schematic sectional drawing in alignment with line II-II of FIG. It is a schematic perspective view which shows the insulator of FIG. It is a schematic sectional side view which shows 2nd Embodiment of the insulation operating rod of this invention. It is a schematic sectional side view which shows 3rd Embodiment of the insulation operating rod of this invention. It is a schematic sectional side view which shows 4th Embodiment of the insulation operating rod of this invention. It is a schematic sectional side view which shows 5th Embodiment of the insulated operation rod of this invention. It is a schematic sectional side view which shows 6th Embodiment of the insulation operating rod of this invention. It is a schematic sectional side view which shows 7th Embodiment of the insulation operating rod of this invention. FIG. 10 is a schematic sectional view taken along line XX in FIG. 9.

  Embodiments of the present invention will be described below.

Embodiment 1 FIG.
1 to 3, the insulating operating rod according to the first embodiment of the present invention is electrically connected to the connecting rod 1 that is charged with high voltage, the insulating rod 2 of the resin laminate, and the connecting rod 1. The connecting rod 3 is inserted into the insulating rod 2 in the laminating direction of the resin laminate (indicated by an arrow A) to connect the connecting rod 1 to the insulating rod 2, and the creeping direction of the insulating rod 2 (indicated by an arrow B) And an insulator 4 that is provided between the connecting pin 3 and the insulating rod 2 and prevents contact between the insulating rod 2 and the connecting pin 3.

  The connecting rod 1 is a rod-shaped charging unit made of a conductive material such as metal. Although not shown, the connecting rod 1 is connected to a movable contact such as a gas insulated circuit breaker at the right end of FIG. At the left end of FIG. 1, two parallel brackets 6 each having a pin hole 5 are provided.

  The insulating rod 2 is a rod-shaped body having a substantially rectangular cross section made of a resin laminate such as a fiber reinforced resin, and has a large volume resistivity as a whole, but is a laminate in a direction in which a layer indicated by an arrow A in FIG. The direction has a larger volume resistivity than the creeping direction, which is the direction along the layer indicated by the arrow B in FIG. Therefore, among the end faces of the insulating rod 2, the end face 7 in the stacking direction which is the end face perpendicular to the stacking direction A has a large volume resistivity, and the end face 8 in the layering direction which is the end face perpendicular to the layering direction B is large. The volume resistivity is smaller than the volume resistivity of the end surface 7 in the stacking direction. For this reason, the insulating rod 2 is arranged so that the end surface 7 in the stacking direction of the connecting rod 1 faces and contacts the inner surface of the bracket 6 of the connecting rod 1. In addition to the outer surface other than the end surface 7 in the stacking direction of the insulating rod 2, the end surface 8 in the layering direction of the insulating rod 2 has a cylindrical shape of the through hole 9 for receiving the connection pin 3 formed so as to extend in the stacking direction. It also appears on the inner surface.

  A connection pin 3 is inserted into the through hole 9 of the insulating rod 2, and both ends of the connection pin 3 are received by the pin holes 5 of the bracket 6 of the connecting rod 1 and held by the retaining ring 10. Between the connecting pin 3 and the insulating rod 2, that is, between the cylindrical outer peripheral surface of the connecting pin 3 and the cylindrical inner surface of the through hole 9 of the insulating rod 2, the creeping direction (arrow) An insulator 4 having a volume resistivity larger than the volume resistivity (indicated by B) is provided to prevent contact between the insulating rod 2 and the connection pin 3. The insulator 4 is a hollow cylindrical sleeve-like member that is accommodated between the connecting pin 3 and the insulating rod 2 without a gap, and the axial length is the same as the thickness of the insulating rod 2, that is, the dimension in the stacking direction. .

  The insulator 4 is, for example, an FRP sleeve as shown in FIG. 3, and is provided only in a portion where the insulating rod 2 and the connection pin 3 face each other, and is provided corresponding to the end surface in the stacking direction of the insulating rod. , It is not inserted between the connecting rod 1 and the connecting pin 3. For this reason, since the connecting rod 1 and the connection pin 3 are electrically connected and the potential of the connection pin 3 is uniquely determined, the connection pin 3 becomes a floating conductor, so that there is no possibility of discharging from there. Highly reliable insulating operation rod can be provided. The insulator 4 is manufactured using a glass epoxy laminate using glass fiber as a base material and an epoxy resin as a filler, and is laminated so that the end surface in the lamination direction becomes the inner and outer peripheral surfaces. FRP pipe.

  According to such a structure, it can suppress that the electric charge of the connecting rod 1 moves to the insulating rod 2 through the connection pin 3, and the triple junction (connecting rod) formed in the junction part between the connecting rod 1 and the insulating rod 2 can be suppressed. It is possible to reduce the rate of increase in the electric field of (1-insulating rod 2-atmosphere gas), suppress the discharge from the triple junction, increase the life of the insulating rod 2, and increase the reliability.

  Further, as the insulator 4, as shown in FIG. 3, an FRP pipe which is made of the same material as the insulating rod 2 and is laminated so that the end surface in the laminating direction becomes the inner and outer peripheral surfaces is used. It is not necessary to separately prepare a material having a volume resistivity larger than the volume resistivity in the layer direction, and the volume resistivity can be easily increased. Moreover, although it is necessary to open the through-hole 9 for letting the connection pin 3 pass to the insulating rod 2, since the material of the sleeve-like insulator 4 inserted into the through-hole 9 is the same as the insulating rod 2, Even during the operation of the device, the dimensional change of the through hole 9 of the insulating rod 2 is small, and it is not necessary to consider the allowable dimension.

Embodiment 2. FIG.
In the insulating operation rod shown in FIG. 4, the axial length of the sleeve-like insulator 4 is longer than the thickness of the insulating rod 2, that is, the dimension in the stacking direction, and is connected to both ends of the insulator 4 protruding from the insulating rod 2. An extension portion 11 in contact with the inner surface of the bracket 6 of the rod 1 is provided, and a gap 12 is formed between the end surface 7 in the stacking direction of the insulating rod 2 and the bracket 6 of the connecting rod 1. Other configurations are the same as those shown in FIGS.

Embodiment 3 FIG.
In the insulating operation rod shown in FIG. 5, the axial length of the insulator 4 is shorter than the dimension in the stacking direction of the insulating rod 2, and both end portions of the insulator 4 are in the stacking direction end face 7 of the insulating rod 2. The annular space 13 is formed inside the through hole 9 and the end surface 7 in the stacking direction of the insulating rod 2 and the bracket 6 of the connecting rod 1 are in contact with each other. Other configurations are the same as those shown in FIGS.

Embodiment 4 FIG.
In the insulating operation rod shown in FIG. 6, an insulating spacer 14 is provided between the axial end of the insulator 4 and the bracket 6 of the connecting rod 1. The length of the sleeve-like insulator 4 in the axial direction is the same as the dimension of the insulating rod 2 in the stacking direction, but the thickness of the insulating spacer 14 is between the end face 7 in the stacking direction of the insulating rod 2 and the bracket 6 of the connecting rod 1. A gap 12 corresponding to the height is formed. Other configurations are the same as those shown in FIGS.

  According to such a configuration, by inserting the insulating spacer 14 between the insulator 4 and the bracket 6 of the connecting rod 1, the end surface in the laminating direction (axial end surface) of the insulator 4 where the charge easily moves. It is possible to prevent electrical connection between the connecting rod 1 and the bracket 6, and to suppress the movement of charges from the connecting rod 1 to the insulating rod 2. In addition, although the degree of influence is small, since the movement of charges from the surface layer of the insulating rod 2 can be suppressed on the surface where the connecting rod 1 and the insulating rod 2 are in direct contact, the contact between the insulating rod 2 and the connecting rod 1 It is possible to completely suppress the movement of charges to the triple junction formed at the point.

Embodiment 5 FIG.
In the insulating operation rod shown in FIG. 7, the insulator 4 is an insulating film 15 formed on the outer peripheral surface of the connection pin 3, and insulation is provided between the axial end portion of the insulator 4 and the bracket 6 of the connecting rod 1. Spacers 14 are provided. The insulating film 15 is a nitride film or the like provided on a portion of the outer peripheral surface of the connection pin 3 that faces the end surface 8 in the through-hole 9 of the insulating rod 2. An insulator having a resistance value larger than the resistivity and having a thickness of about 10 μm. Other configurations are the same as those shown in FIGS. According to this configuration, since the insulator 4 is formed by directly forming the insulating film 15 on the connection pin 3, it is possible to omit the work of inserting a sleeve-like member into the connection pin 3 and assembling. The number of work steps can be reduced, and a highly reliable insulating operation rod can be provided while keeping costs down.

Embodiment 6 FIG.
In the insulating operation rod shown in FIG. 8, the insulator 4 as the insulating film 15 has a slit 16 extending in the circumferential direction, and the contact area with the insulating rod 2 is reduced. The thickness of the insulating film 15 is preferably 10 μm or more, and it is preferable to secure a distance between the electrodes so that the discharge voltage becomes sufficiently large. Other configurations are the same as those shown in FIG. According to such a configuration, the slit 16 is provided in the insulating film 15 and the contact area with the insulating rod 2 can be reduced, so that the resistance value of the insulator 4 can be easily increased. Further, by setting the thickness of the insulator 4 to 10 μm or more, the possibility of discharge between the insulating rod 2 and the connection pin 3 at 0.4 to 0.6 MPa (gauge pressure) in SF6 gas is reduced. Can do.

Embodiment 7 FIG.
The insulating operation rod shown in FIGS. 9 and 10 is a hollow cylindrical body composed of a resin laminate having a large number of cylindrical resin layers on which the insulating rod 2 is coaxially stacked. The connecting portion of the connecting rod 1 is inserted coaxially inside the insulating rod 2, and the connecting pin 3 is inserted in the pin hole 5 provided in the radial direction in the connecting rod 1, and both ends are insulated. The rod 2 is inserted into two through holes 9 arranged in the radial direction and held by a retaining ring 10. An insulating film 15 is formed as an insulator 4 on portions facing the end surface 8 in the layering direction, which is the inner peripheral surface of the through hole 9 of the insulating rod 2 at both ends of the connection pin 3. Further, the connection pin 3 is insulated between the outer peripheral surface of the connection pin 3 and the radially inner end of the insulating film 15 as the insulator 4 and between the radially outer end of the insulating film 15 and the retaining ring 10. Spacers 14 are provided. Other configurations are the same as those shown in FIGS. According to such a configuration, even if the insulating rod 2 is cylindrical, the same effect as that of the rectangular insulating rod 2 can be obtained.

  The apparatus illustrated and described above is merely an example, and various modifications are possible, and the features of each specific example can be used altogether or selectively combined.

  The present invention can be used for an insulating operation rod.

  DESCRIPTION OF SYMBOLS 1 Connecting rod, 2 Insulating rod, 3 Connection pin, 4 Insulator, 5 Pin hole, 6 Bracket, 7 Lamination direction end surface, 8 Layering direction end surface, 9 Through hole, 10 Retaining ring, 11 Extension part, 12 Gap, 13 Space, 14 insulating spacer, 15 insulating film, 16 slit.

Claims (11)

With connecting rod charged with high voltage,
An insulating rod of a resin laminate;
A connection pin electrically connected to the connecting rod, inserted into the insulating rod in the stacking direction of the resin laminate, and connecting the connecting rod to the insulating rod;
The insulating rod has a volume resistivity higher than the volume resistivity in the layering direction, and is provided between the connection pin and the insulating rod to prevent contact between the layering end surface of the insulating rod and the connection pin. An insulating operation rod comprising an insulator.   The insulating operation rod according to claim 1, wherein the insulator is an FRP sleeve.   The insulating operating rod according to claim 1 or 2, wherein the insulator is provided only in a portion where the insulating rod and the connection pin face each other.   The insulating operation rod according to any one of claims 1 to 3, wherein the insulator is provided so as to correspond to an end surface in a laminating direction of the insulating rod.   The insulating operating rod according to any one of claims 1 to 3, wherein the insulator is longer than a dimension in the stacking direction of the insulating rod.   The insulating operation rod according to any one of claims 1 to 3, wherein the insulator is shorter than a dimension in a stacking direction of the insulating rod.   The insulating operation rod according to claim 1, wherein an insulating spacer is provided between the insulator and the connecting rod.   The insulating operating rod according to any one of claims 1 to 7, wherein the insulator is an insulating film formed on the connection pin.   The insulating operating rod according to claim 1, wherein the insulator has a slit extending in a circumferential direction.   The insulating operating rod according to claim 1, wherein the insulating rod is a rod-shaped body having a rectangular cross section.   The insulating operating rod according to any one of claims 1 to 9, wherein the insulating rod is a cylindrical body.

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