JP2008091271A - Three-phase package type grounding switch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a three-phase package type grounding switch capable of contributing to size reduction and cost reduction of an equipment and having superior reliability by aiming at a smaller diameter of a metal vessel, while securing required insulating distance. <P>SOLUTION: A fixed-side contact part 4b, arranged at a main circuit conductor 3b, is provided further shifted toward the axis direction of the main circuit conductor 3b than the fixed-side contact parts 4a, 4c of the other phase. Furthermore, a movable contact part 5b that faces the fixed side contact part 4b and a movable contactor 6b, coming into and out of contact with the fixed side contact part 4b, are arranged both tilted at the same angle from the axis direction of a branched metal vessel 10. In other words, the operating direction of movable contactors 6a, 6c is vertical, but that of the movable contactor 6b is set tilted from the vertical direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a three-phase collective earthing switch, and more particularly, to a three-phase collective earthing switch in which a metal container including an opening / closing mechanism has been miniaturized.

  In recent years, gas-insulated switchgear has become mainstream in substations and switch stations, but in order to reduce the site area of substations and switch stations, three-phase collective gas-insulated switchgear has been adopted. . A three-phase gas-insulated switchgear is a three-phase main circuit conductor that is a high-voltage part, and is housed in a grounded metal container. This can contribute to a reduction in the installation area of the apparatus. Therefore, a ground switch that is one of the components of the gas insulated switchgear has been proposed as a three-phase package for the same purpose.

  Here, a conventional three-phase collective earthing switch will be described in detail with reference to the structural diagram of FIG. 9 and FIG. As shown in FIGS. 9 and 10, three-phase main circuit conductors 3 a, 3 b, and 3 c are collectively stored in a cylindrical metal container 1 filled with an insulating gas. Is supported in the metal container 1.

  The main circuit conductors 3a, 3b, and 3c must secure an insulation distance from the inner wall surface of the metal container 1 and an insulation distance between the main circuit conductors 3a, 3b, and 3c of each phase. Moreover, it is desirable to make the metal container 1 as small as possible. In order to satisfy these needs, the main circuit conductors 3a, 3b, 3c are not arranged in parallel in the metal container 1, but are arranged at the apexes of the triangle drawn in the metal container 1. In the metal container 1 (see FIG. 10). The main circuit conductors 3a, 3b, and 3c are provided with fixed contact portions 4a, 4b, and 4c of ground switches, and the movable side contact of the ground potential is provided so as to face the fixed side contact portions 4a, 4b, and 4c. The parts 5a, 5b, 5c are arranged.

  Further, movable contacts 6a, 6b, 6c are slidably disposed in the movable contact portions 5a, 5b, 5c. The movable contacts 6a, 6b, 6c are attached to the opening / closing mechanism section 9. The opening / closing mechanism 9 includes a main shaft 7 and a link lever mechanism 8, and movable contacts 6 a, 6 b, 6 c are connected to the main shaft 7 via the link lever mechanism 8. The opening / closing mechanism 9 is housed in a branched metal container 10 that is branched from the metal container 1. The movable contact portions 5a, 5b, and 5c are arranged in the same direction for all three phases, and the movable contacts 6a, 6b, and 6c are also configured to operate in the same direction for all three phases.

  In the three-phase collective earthing switch having the above-described configuration, the switching mechanism 9 operates to transmit the operating force from the main shaft 7 to the movable contacts 6a, 6b, 6c via the link lever mechanism 8 and to apply the operating force. The movable contactors 6a, 6b, and 6c thus moved reciprocate in the axial direction so as to contact and separate from the fixed side contact portions 4a, 4b, and 4c. For example, Patent Documents 1 and 2 are known as conventional examples including such an opening / closing mechanism.

Patent Document 1 aims to reduce the diameter of a branched metal container serving as a case for an opening / closing mechanism by making the movable contactor of both end phases Z-shaped. Patent Document 2 is characterized in that the disconnecting portion and the opening / closing mechanism portion of the earthing switch are arranged in two layers, and that the opening / closing mechanism portion of the earthing switch is housed in the opening / closing mechanism portion of the disconnecting portion. The branch metal container that becomes the case of the opening / closing mechanism of the switch is omitted, and the overall size of the device is reduced.
JP 2002-42615 A Japanese Patent Publication No. 7-27748

  The above prior art has the following problems. That is, when determining the arrangement of the opening / closing mechanism 9, the insulation distance between the fixed contact 4b and the movable contact 5b attached to the main circuit conductor 3b is a determining factor. At this time, in the three-phase collective earthing switch in which the main circuit conductors 3a, 3b, and 3c are arranged at the apexes of the triangle, the position of the main circuit conductor 3b is closer to the switching mechanism 9 side than the center of the metal container 1 is. Is arranged. Therefore, when viewed from the center of the metal container 1, the height H1 (illustrated in FIG. 10) of the branch metal container 10 serving as the case of the opening / closing mechanism 9 is high.

  Moreover, since the fixed side contact portions 4a, 4b, and 4c have sliding portions for sliding the movable contacts 6a, 6b, and 6c therein, in order to ensure necessary insulation performance, The diameter must be larger than the diameter of the main circuit conductors 3a, 3b, 3c. In this case, the insulation distance L (shown in FIG. 10) between the high voltage portion and the ground potential portion is minimized between the fixed side contact portion 4b and the movable side contact portion 5a or 5c. That is, the insulation distance between the main circuit conductors 3b and 3a or 3c when there is no grounding switch is equivalent to the diameter of the fixed side contact portions 4, 4b and 4c larger than the diameter of the main circuit conductors 3a, 3b and 3c Will also decrease significantly. As a result, in order to ensure the predetermined insulation performance, it is necessary to increase the insulation distance between the fixed side contact portion 4b and the movable side contact portion 5a or 5c, resulting in a problem that the metal container 1 is enlarged. .

  Patent Documents 1 and 2 aim to reduce the size of the device in view of the above-mentioned problems, but the following problems have been pointed out. In Patent Document 1, the diameter of the branched metal container is realized by making the movable contact of both end phases Z-shaped, but it is difficult for the Z-shaped movable contact to obtain necessary strength and insulation performance, Manufacturing cost was high. Moreover, in patent document 2, the movable side conductor of a disconnector will be arrange | positioned in a line. For this reason, in order to secure the insulation distance between the phases, the diameter of the metal container has to be increased.

  The present invention has been proposed to solve the above problems, and its purpose is to reduce the size and cost of the equipment by reducing the diameter of the metal container while ensuring the necessary insulation distance. It is to provide a three-phase collective earthing switch that can contribute and has excellent reliability.

  In order to achieve the above object, the present invention provides a main circuit conductor for three phases housed in a grounded metal container, a fixed side contact portion provided on the main circuit conductor of each phase, and the fixed side contact. A movable-side contact portion with a ground potential disposed opposite to the movable portion, and a movable contact that is slidably disposed with respect to the movable-side contact portion and reciprocates in the axial direction thereof to contact and separate from the fixed-side contact portion. In a three-phase collective earthing switch comprising a child and an opening / closing mechanism that reciprocates the movable contact by applying an operating force to the movable contact and the fixed contact portion. Alternatively, the two-phase fixed-side contact portion is provided in the main circuit conductor while being shifted in the axial direction of the main circuit conductor when viewed from the fixed-side contact portion of the other phase, and the two-phase fixed-side contact portion is shifted in the axial direction of the main circuit conductor. The movable side contact portion facing the fixed side contact portion and the movable side contacting and separating from the fixed side contact portion The probe is characterized in that arranged inclined at the same angle.

  In the above-described invention, the one-phase or two-phase fixed side contact portion is shifted in the axial direction of the main circuit conductor, and the movable side contact portion facing the shifted fixed side contact portion and the movable contact contacting and separating from the fixed side contact portion. By disposing the child at the same angle, the opening / closing mechanism can be brought closer to the main circuit conductor side while maintaining the necessary insulation distance between the fixed contact portion and the movable contact portion, and the opening / closing mechanism is stored. Since the space can be reduced, the height dimension of the metal container can be shortened as a result.

  In addition, the portion where the insulation distance is minimum with respect to the movable-side contact portion of the ground potential by having the one-phase or two-phase fixed-side contact portion shifted in the axial direction of the main circuit conductor has a sliding portion. Thus, the main circuit conductor can be smaller in diameter than the fixed contact portion, rather than the fixed contact portion having a relatively large diameter. Therefore, it is easy to increase the insulation distance between the movable contact portion and the main circuit conductor, and the increase in the diameter of the metal container can be reliably suppressed.

  According to the three-phase collective earthing switch of the present invention, a member with high manufacturing cost is not required due to an extremely simple configuration in which the one-phase or two-phase fixed side contact portions are arranged shifted in the axial direction of the main circuit conductor. Thus, it is possible to reduce the size of the metal container while securing a predetermined insulation distance, thereby contributing to reduction in size, cost reduction, and improvement in reliability.

  Hereinafter, typical embodiments according to the present invention will be specifically described with reference to FIGS. The following embodiments are applied to a three-phase collective earthing switch as in the prior art shown in FIGS. 9 and 10, and the same members are denoted by the same reference numerals and described. Is omitted.

(1) First Embodiment [Configuration]
A first embodiment according to the present invention will be specifically described with reference to FIGS. FIG. 1 is a structural sectional view of a three-phase collective earthing switch according to the present embodiment, and FIG. 2 is a sectional view taken along the line II-II in FIG.

  As shown in FIGS. 1 and 2, in a three-phase collective earthing switch in which main circuit conductors 3a, 3b, and 3c for three phases are respectively arranged at the apexes of a triangle, the main phase conductor is close to the switching mechanism 9 as the main phase. A circuit conductor 3b is arranged. The fixed-side contact portion 4b disposed on the main circuit conductor 3b is shifted from the other-phase fixed-side contact portions 4a and 4c in the axial direction of the main circuit conductor 3b (the left side in the drawing in FIG. 1). ing. Further, the movable side contact portion 5b facing the fixed side contact portion 4b and the movable contact 6b contacting and separating from the fixed side contact portion 4b are both inclined at the same angle from the axial direction of the branched metal container 10. Yes. That is, the operation direction of the movable contacts 6a and 6c is the vertical direction, but the operation direction of the movable contact 6b is inclined from the vertical direction.

[Function and effect]
The operational effects of the first embodiment having the above-described configuration are as follows. That is, by arranging the fixed side contact portion 4b, the movable side contact portion 5b, and the movable contact 6b to be inclined with respect to the axial direction of the branched metal container 10, necessary insulation between the fixed side contact portion 4b and the movable side contact portion 5b is obtained. The opening / closing mechanism 9 can be brought closer to the main circuit conductor 3b side while maintaining the distance. Therefore, the height dimension H2 of the branched metal container 10 can be shortened from the height dimension H1 of the conventional example, and the ground switch can be miniaturized.

  Further, since the fixed side contact portion 4b is shifted in the axial direction of the main circuit conductor 3b, the insulation distance with respect to the movable side contact portion 5a or 5c having the ground potential is minimized from the fixed side contact portion 4b. The main circuit conductor 3b has a small diameter. For this reason, the insulation distance L can be made large, it is not necessary to increase the diameter of the metal container 1, and the ground switch can be miniaturized also from this point. That is, it is possible to reduce the size of the metal container while securing a predetermined insulation distance, and contribute to improvement in reliability. Moreover, a member having a high manufacturing cost such as a Z-shaped movable contact is unnecessary, which is economically advantageous.

(2) Second Embodiment [Configuration]
FIG. 3 is a structural sectional view showing a second embodiment of the present invention, and FIG. 4 is a sectional view taken along the line IV-IV in FIG. As shown in FIGS. 3 and 4, three-phase L-shaped disconnector movable side conductors 11 a, 11 b, and 11 c are supported by an insulating spacer 2 in a cylindrical metal container 1 filled with an insulating gas. ing. The disconnector movable side conductors 11a, 11b, and 11c for three phases are arranged at the apexes of the triangle.

  The disconnector movable-side conductors 11a, 11b, and 11c are formed with bent portions, and the bent portions are provided with fixed-side contact portions 4a, 4b, and 4c of the ground switch in each phase, and the fixed-side contact portions 4a. The movable side contact portions 5a, 5b, and 5c having the ground potential are arranged opposite to 4b and 4c. Note that movable contacts 6a, 6b, 6c are slidably disposed in the movable contact portions 5a, 5b, 5c, and reciprocate in the axial direction by the force transmitted from the main shaft 7 via the link lever mechanism 8. By moving, it contacts and separates from the fixed side contact portions 4a, 4b, 4c to constitute a ground switch.

  Among the fixed side contact portions 4a, 4b, and 4c, the fixed side contact portion 4b of the phase close to the opening / closing mechanism portion 9 is the same angle as the opposed movable side contact portion 5b and the movable contact 6b from the axial direction of the metal container 1. Arranged at different angles. Thereby, the operation direction of the movable contact 6b is different from the other two-phase movable contacts 6a and 6c, and the opening / closing mechanism 9 is concentrated on one side of the empty space of the metal container 1, and the disconnector is opened and closed in the empty space. The mechanism unit 12 is arranged.

[Function and effect]
In the second embodiment having the above-described configuration, the fixed-side contact portion 4b, the movable-side contact portion 5b, and the movable contact 6b are inclined with respect to the axial direction of the metal container 1 as in the first embodiment. By doing so, the disconnector movable side conductors 11a, 11b, and 11c are not arranged in a line, and the length of the metal container 1 is maintained while maintaining a necessary insulation distance between the fixed side contact portion 4b and the movable side contact portion 5b. There is an effect that the dimension H can be shortened and the grounding switch can be downsized. Moreover, since the open / close mechanism 12 of the disconnect switch can be accommodated in the empty space of the metal container 1, it is possible to contribute to the miniaturization of the disconnect switch / ground switch.

(3) Other Embodiments The three-phase collective earthing switch of the present invention is not limited to the above-described embodiment, but the shape of the metal container and the main circuit conductor and the operation force transmission from the main shaft to the movable contactor. The operation direction of the system and the movable contact can be selected as appropriate. Specifically, there are embodiments as shown in FIGS. 5 and 6 as modifications of the arrangement of the main circuit conductors. That is, in the three-phase collective earthing switch shown in FIGS. 5 and 6, not the main circuit conductor 3b but the main circuit conductors 3a and 3c are arranged as phases close to the switching mechanism unit 9, and these main circuits are arranged. Fixed side contact portions 4a and 4c attached to the conductors 3a and 3c are provided so as to be shifted in the axial direction of the main circuit conductors 3a and 3c.

  More specifically, the fixed-side contact portion 4a is provided shifted from the fixed-side contact portion 4b in the left direction in FIG. 5, and the fixed-side contact portion 4c is positioned in the right direction in FIG. 5 relative to the fixed-side contact portion 4b. It is provided to shift to. Moreover, the movable side contact parts 5a and 5c and the movable contacts 6a and 6c that are opposed to each other are inclined at the same angle and at different angles in the a phase and the c phase from the axial direction of the branched metal container 10, respectively. Thereby, the operation directions of the movable contacts 6a, 6b and 6c are different in the three phases. Even in the embodiment as described above, the same operational effects as those in the first embodiment can be obtained.

  In the second embodiment, the disconnector movable side conductors 11a, 11b, and 11c and the open / close mechanism 12 of the disconnector are provided, but these are omitted, and the main circuit conductors 3a, 3b, and 3c are replaced with L. Shaped embodiments are also included (see FIGS. 7 and 8). That is, the main circuit conductors 3a, 3b, and 3c are L-shaped and have bent portions, and fixed contact portions 4a, 4b, and 4c of the ground switch are provided in the bent portions in each phase.

  Opposed to the fixed side contact portions 4a, 4b, and 4c are movable side contact portions 5a, 5b, and 5c having a ground potential. Here, the stationary-side contact portion 4b of the phase close to the opening / closing mechanism portion 9 is disposed at an angle different from the axial direction of the metal container 10 at the same angle as the opposed movable-side contact portion 5b and the movable contact 6b. Thereby, the operation direction of the movable contact 6b is different from that of the other two-phase movable contacts 6a and 6c.

  According to such an embodiment, similarly to the first embodiment, by arranging the fixed side contact portion 4b, the movable side contact portion 5b and the movable contact 6b to be inclined from the axial direction of the metal container 1, While maintaining the necessary insulation distance between the fixed contact portion 4b and the movable contact portion 5b, the length H2 of the metal container 1 can be reduced as compared with the conventional case, and the ground switch can be miniaturized.

The structure sectional view of a 1st embodiment concerning the present invention. FIG. 2 is a sectional view taken along the line II-II in FIG. The structure sectional view of the 2nd embodiment concerning the present invention. FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3. The structure sectional view of other embodiments concerning the present invention. FIG. 6 is a sectional view taken along the line VI-VI in FIG. 5. The structure sectional view of other embodiments concerning the present invention. FIG. 8 is a cross-sectional view taken along arrow VIII-VIII in FIG. 7. Cross-sectional view of the structure of a conventional three-phase collective earthing switch. FIG. 2 is a cross-sectional view taken along line XX in FIG. 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Metal container 2 ... Insulating spacer 3a, 3b, 3c ... Main circuit conductor 4a, 4b, 4c ... Fixed side contact part 5a, 5b, 5c ... Movable side contact part 6a, 6b, 6c ... Movable contact 7 ... Main axis 8 ... Link lever mechanism 9 ... Opening / closing mechanism 10 ... Branch metal containers 11a, 11b, 11c ... Disconnector movable side conductor 12 ... Disconnector opening / closing mechanism

Claims (4)

A main circuit conductor for three phases housed in a grounded metal container, a fixed side contact portion provided on the main circuit conductor of each phase, and a movable ground potential arranged opposite to the fixed side contact portion. A side contact portion, a movable contact that is slidably arranged with respect to the movable side contact portion, reciprocally moves in the axial direction thereof, and an operating force is applied to the movable contact In a three-phase collective earthing switch composed of an opening / closing mechanism that reciprocates and moves the movable contact and the stationary contact portion apart from each other,
The one-phase or two-phase fixed-side contact portion is provided on the main circuit conductor by shifting in the axial direction of the main circuit conductor when viewed from the fixed-side contact portion of the other phase,
The movable contact portion facing the fixed contact portion shifted in the axial direction of the main circuit conductor and the movable contact contacting and separating from the fixed contact portion are inclined at the same angle. Three-phase batch type earthing switch.   The three-phase collective earthing switch according to claim 1, wherein the main circuit conductor is disposed at each vertex of a triangle drawn in the metal container. The main circuit conductor is provided in an L shape,
An empty space is formed in the metal container in the vicinity of the corner portion of the L-shaped main circuit conductor,
The three-phase collective earthing switch according to claim 1 or 2, wherein the movable contact portion and the movable contact are arranged in the empty space.   4. The three-phase collective earthing switch according to claim 3, wherein an opening / closing mechanism part of a disconnecting device is arranged in the empty space together with the movable side contact part and the movable contactor.

Images