JP2008084717A - Gas insulated circuit breaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas insulated circuit breaker of a circular arc movement type in which a duty to interrupt a loop current can be achieved without speeding up opening speed of a movable contactor, and which can be made light-weighted by reducing the number of parts. <P>SOLUTION: In a container for sealing an insulating gas, a contact part of the gas insulation disconnecting switch is constituted by arranging a movable side conductor 1 to install a movable contact 3 rotatably in a counterclockwise direction or a clockwise direction, and a fixed side conductor 5 to install a fixed contact 6. The movable contact 3 and the fixed contact 6 includes an arc driving means at these tips. The arc driving means is constituted of circular current passages 3A, 6A by circular grooves 10, 11 at contact faces of the tip ends of the movable contact 3 and the fixed contact 6. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a gas insulated disconnect switch, and more particularly to an arc motion type gas insulated disconnect switch in which a movable contact moves in a circular arc.

  In general, when a power transmission / transformation facility is configured using a gas-insulated switchgear, a configuration of a gas-insulated double bus that can reduce the bus stop period and the probability of the stop is increasing. In the case of this type of gas-insulated double bus configuration, the gas-insulation disconnector is required to interrupt the loop current.

  Since the duty of interrupting the loop current in the gas-insulated disconnector is to commutate the current flowing through the conductor of the bus, the recovery voltage is as low as several tens to several hundreds of volts, but the current of several thousand A must be interrupted. Therefore, current interruption performance is important.

  In order to improve the duty of interrupting the loop current of the gas insulated disconnector, an arc-resistant material is used for the movable contact and the stationary contact of the gas insulated disconnector, and the opening speed of the movable contact is increased, or In order to shorten the arc time by using a magnetic field, it has been proposed to have a linear motion structure in which a movable contact is linearly moved to open and close.

  In this way, when the movable contact has a linear motion structure, the arc length can be increased by increasing the distance between the electrodes in a short time, and the coil or magnet for improving the current interrupting performance by rotating the arc. It is easy to arrange the parts such as the puffer method and the current limiting method.

  On the other hand, the arc motion type gas insulated disconnector, that is, the structure in which the movable contact is moved in a circular motion to contact and separate, and the contact opening and closing is accommodated by accommodating the contact portion compared to the above linear motion type. The container to be sealed can be made compact, and no shield is required, reducing the number of parts. In this case, since the movable contact moves in a circular arc shape and widens the gap, the arc that is ignited when the loop current is interrupted moves in the direction of the rotation axis of the movable contact. However, there is a problem that the distance between the poles is not easily increased even if the value is increased.

  In the arc-insulated gas insulated disconnector, for example, the gas insulated disconnector disclosed in Patent Document 1, the electric field at each end of the movable contact and the stationary contact is increased. Moreover, it has been proposed that the position of the electric field relaxation electrode with respect to the movable contact is changed between an open circuit state and a closed circuit state to improve the ground and interelectrode dielectric strength at the position of the movable contact in the open state. Yes.

JP 2004-63110 A

  In the above-mentioned arc motion type gas insulated disconnector, in order to improve the loop current interruption performance, the movable contactor is lengthened, or the operation device for operating the movable contactor is used so that it can be moved. It is necessary to increase the rotational speed at which the contact opens. For this reason, an operating device capable of accumulating large breaking energy is required, and the number of parts such as springs is increased, which hinders a reduction in size and weight of the gas insulated disconnector.

  An object of the present invention is to provide an arc motion type gas insulated disconnector that can achieve the duty of interrupting a loop current without increasing the opening speed of the movable contact, and can be reduced in size and weight by reducing the number of parts. is there.

  The arc motion type gas insulated disconnector according to the present invention comprises a contact portion by arranging a movable side conductor provided with a movable contact and a fixed side conductor provided with a fixed contact in a container enclosing an insulating gas. The movable contact and the fixed contact are provided with arc driving means at the tip when the movable contact is mounted to be rotated counterclockwise or clockwise by an operating device. ing.

  The arc driving means is characterized in that it comprises a circulating current path provided at the tip of the movable contact and the fixed contact. In addition, a gas flow guide insulating member having at least an opening is provided at the distal end portion of the stationary contact on the rotational movement direction side of the movable contact.

  Further, the movable side conductor is characterized by being arranged on a different axis on the side where the movable contact rotates with respect to the axis of the fixed side conductor. Furthermore, the movable contact is characterized in that its tip is bent toward the fixed contact.

  If the gas insulation disconnector is configured as in the present invention, the loop current interruption performance can be improved without increasing the opening speed between the movable contact and the fixed contact, and therefore, the operating force is lower than in the prior art. Since an operating device can be used, it can be manufactured economically by reducing the number of parts and reducing the size and weight.

  In the gas insulated disconnector of the present invention, when the movable side conductor provided with the movable contact so as to be rotatable and the fixed side conductor provided with the fixed contact are arranged to constitute the contact portion, the movable contact and the fixed contact are formed. Is provided with arc driving means at its tip.

  The gas insulation disconnector shown in FIG. 1, which is the first embodiment of the present invention, has a movable side conductor 1 connected to other equipment in a container (not shown) that encloses an insulation gas in the same manner as a known one. And the fixed-side conductor 5 are arranged on the same axis. This movable conductor 1 is provided with a pair of linear plate-like movable contacts 3 on both side surfaces 1A at the tip thereof, and is rotatably attached so that the pin 4 serves as a rotation axis.

  The movable contact 3 is circularly moved counterclockwise or clockwise by an operating force of an operating device (not shown), and is brought into and out of contact with the fixed contact 6 provided at the tip of the fixed-side conductor 5 to open or close the pole. I can do it. In order to improve electrical connection, contact pieces 7 are respectively provided on the contact surfaces between the movable contact 3 and the fixed contact 6 and between the connection portion 2 of the movable conductor 1 and the movable contact 3.

  The movable contact 3 and the fixed contact 6 are arc driving means having a special shape at the tip portion where both contact and separation are made according to the present invention. That is, the movable contact 3 and the stationary contact 6 are arranged at a substantially right angle, which is a current circulation path forming means, at the corner surface of the front end portion where the movable contact 3 rotates and moves to the end when the contact is opened. Circumferential grooves 10 and 11 are provided, respectively. As a result, both the movable contact 3 and the fixed contact 6 form the movable-side circular current path 3A and the fixed-side circular current path 6A by the circular grooves 10 and 11, and serve as arc driving means.

  In these circulating current path 3A and circulating current path 6A, when the movable contact 3 tries to move away from the fixed contact 6 when the loop current that opens when the movable contact 3 moves arcuately counterclockwise is interrupted. As shown in FIG. 2, the current flows until the final point of separation, and at the time of opening, the arc Ar caused by the loop current is lit up at a position where the contacts 3 and 5 are closest to each other.

  At this time, the current i flows through both the circulating current path 3A of the movable contact 3 and the circulating current path 6A of the fixed contact 6 as indicated by the broken line arrows, and the movable circulating current path 3A and the fixed side The direction in which the current i flows is opposite to that of the circulating current path 6A. For this reason, the electromagnetic force Fe generated by the current i flowing in both directions acts on the arc Ar when the loop current is interrupted. As a result, the arc Ar is driven by the electromagnetic force Fe in the direction of the distal end of the movable contact 3 and is stretched and interrupted.

  Therefore, if a circular current path is formed on each of the corner surfaces of the tip portions of the movable contact 3 and the stationary contact 6 to form an arc driving means, the rotation angle of the movable contact 3 can be increased as in the prior art. Alternatively, the arc Ar generated when the loop current is interrupted can be extended and interrupted without using an operating device having a large operating force. Therefore, even if an operating device having a small number of parts and a reduced size and weight is used, it can be shut off without any problem.

  Moreover, the gas insulation disconnector which is the 2nd Example of this invention is shown in FIG.3 and FIG.4, In this example, the same part as the 1st Example is shown with the same code | symbol. In this gas insulated disconnector, the movable side conductor 1 and the fixed side conductor 5 connected to other devices are arranged on different axes in a container (not shown) that encloses the insulating gas, and the movable contactor 3 The feature is that the shape is changed.

  The movable side conductor 1 is arranged by shifting the position of the axis line to be arranged upward by a predetermined dimension L with respect to the arrangement axis line of the fixed side conductor 5 in the upward direction, which is the direction in which the movable contact 3 is rotated by an arc. In addition, the movable contact 3 is formed such that its tip is bent as it approaches the fixed contact 6 side, and its shape is a "<" shape. Thereby, by arranging the movable-side conductor 1 and the fixed-side conductor 5 on different axes, the rotation angle of the distal end portion of the movable contact 3 becomes larger than when both are arranged on the same axis, and the movable contact When 3 is “cut”, the insulation distance from the container is increased, so that the container can be reduced in size. In the structure in which the movable contact 3 is opened by circular arc movement in the clockwise direction, the movable conductor 1 is naturally arranged by being shifted downward with respect to the arrangement axis of the fixed conductor 5.

  In this embodiment, similarly to the above-described embodiment, the movable contact 3 is provided with the circular groove 10 and the fixed contact 6 is provided with the circular groove 11 to form the circular current path 3A and the linear circular current path 6A. As a means. Further, a gas flow guide insulating member 12 formed with an opening opened on the upper and right sides in the figure is attached to the tip of the stationary contact 6 that is in contact with and away from the movable contact 3, for example, a countersunk screw 14 made of an insulator. Attached. The gas flow guide insulating member 12 also serving as the arc driving means allows the expanded insulating gas generated by the arc Ar generated when the loop current is interrupted to flow in the opening direction.

  Even in the contact structure of this gas insulated disconnector, when the loop current is interrupted, the movable contact 3 tries to open by moving in a circular motion upward in the counterclockwise direction as shown in FIG. At the initial stage of leaving the fixed contact 6, the arc Ar is lit up. At this time, as described above, current flows in the circulating current path 3A and the circulating current path 6A that are arc driving means, and the electromagnetic force Fe caused by this current acts on the arc Ar. It is driven and stretched and finally shut off.

  In addition, since the gas flow guide insulating member 12 is provided at the tip of the fixed contact 6, the insulating gas expanded by the heat of the arc Ar is ejected upward and to the right from the opening. Therefore, the arc Ar that has been ignited is driven more strongly in the direction of the tip of the movable contact 3 by both the electromagnetic force Fe and the driving force Ff by the insulating gas flow, and is stretched faster than the first embodiment. Therefore, the loop current can be interrupted and the interrupting performance is improved.

  Note that the movable conductor 1 and the fixed conductor 5 of the gas insulated disconnector are often arranged shifted upward or downward in the container in consideration of the arrangement of conductors in the bus bar and connection with other devices. Therefore, there is no problem even if the conductor arrangement of the contact portion is the structure shown in the embodiment, and the entire gas insulation disconnector can be configured without becoming large.

  Further, the gas flow guide insulating member 12 provided at the tip of the fixed contact 6 can be applied to the fixed contact 6 combined with the linear movable contact 3 shown in the first embodiment, and the gas flow guide insulating member. The opening 12 may be provided only in the upper part in the direction in which the movable contact 3 rotates. Even in this case, the effect of improving the loop current interruption performance of the gas insulated disconnector can be achieved.

  Further, the gas insulation disconnector shown in FIG. 5 which is the third embodiment of the present invention has the same configuration as that of FIG. 3 in the configuration of the movable contact 3 and the fixed contact 6 provided with the arc driving means similar to FIG. The movable side conductor 1 and the fixed side conductor 5 are arranged on different axes. Further, an example is shown in which a ground electrode 13 provided on the container is arranged above the movable contact 3 that opens by circular arc movement, and the movable contact 3 is combined as a ground switch that connects to the ground electrode 13. Similarly, the same parts as those described above are denoted by the same reference numerals.

  In FIG. 5, (a) the disconnecting switch is “ON” and the earthing switch is “OFF”, (b) the disconnecting switch is switched from “ON” to “OFF”, and (c) the disconnecting switch. And the grounding switch is in the “OFF” stage, and the disconnecting switch in (d) is “OFF”, the grounding switch is “ON”, and the movable conductor 1 is grounded.

  Also in the gas insulated disconnector of this embodiment, when the movable contact 3 rotates and moves counterclockwise as shown in FIG. 5B, the circulating current path 3A of the movable contact 3 is the same as described in FIG. Since the current flows in the circulating current path 6A of the stationary contact 6 and the arc Ar is stretched and driven by the electromagnetic force Fe generated by this current, the loop current is quickly cut off, so that the same effect as described above is achieved. Can do.

  In the arrangement structure of the disconnecting switch and the ground switch shown in FIG. 5, the rotation angle of the movable contact 3 is larger than that in the example of FIG. Even when a low disconnector grounding switch is combined, when the disconnector and the grounding switch are “OFF” as shown in FIG. 5C, the distance Ld> Ls between the poles is widened. Miniaturization can be achieved.

(A) And (b) is the front view and top view which show the contact part of the gas insulation disconnector which is one Example of this invention. It is a front view which shows the operation state of FIG. (A) And (b) is the front view and top view which show the contact part of the gas insulation disconnector which is another Example of this invention. It is a front view which shows the operation state of FIG. (A)-(d) is a front view which shows the operation | movement process of the contact part of the gas insulation disconnector which is another Example of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Movable side conductor, 3 ... Movable contact, 3A ... Circulation current path, 5 ... Fixed side conductor, 6 ... Fixed contact, 6A ... Circulation current path, 10, 11 ... Circulation groove, 12 ... Gas flow guide insulation member , 13: Ground electrode.

Claims (5)

  A movable side conductor provided with a movable contact and a fixed side conductor provided with a fixed contact are arranged in a container enclosing an insulating gas to constitute a contact portion, and the movable contact is counterclockwise by an operating device. Alternatively, in the gas insulated disconnector attached so as to be rotatable in the clockwise direction, the movable contact and the fixed contact are provided with arc driving means at the tip thereof.   2. The gas insulated disconnector according to claim 1, wherein the arc driving means is constituted by a circulating current path provided at a tip portion of the movable contact and the stationary contact.   3. The gas insulation disconnector according to claim 1, wherein a gas flow guide insulating member having at least an opening is provided at a distal end portion of the fixed contact at a rotational movement direction side of the movable contact.   4. The gas according to claim 1, wherein the movable conductor is arranged on a different axis on a side on which the movable contact rotates with respect to an axis of the fixed conductor. Insulation disconnector.   4. The gas insulated disconnector according to claim 3, wherein the movable contact has a shape in which a distal end portion thereof is bent toward the fixed contact.

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