JP2011050173A - Disconnection mechanism of drawer-type electric apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disconnection mechanism which can block an excitation current, or the like, without having to install a cutout switch, or the like. <P>SOLUTION: A movable arc contactor 22, which is purposed for blocking a current is arranged in addition to a main contactor 12 which is purposed for carrying a current. After the main contactor 12 is disconnected at the operation of the disconnection, the movable arc contactor 22 is disconnected from a fixed arc contactor 16 by an accumulation energization force of a twisted coil spring 23. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a disconnecting mechanism for a drawer-type electrical device such as a transformer housed inside a switchboard.

  A drawer-type electrical device such as a transformer housed inside the switchboard is attached to a wheeled carriage so that it can be easily removed from the switchboard during maintenance or replacement. These drawer-type electrical devices generally employ a configuration that moves in the depth direction from the front of the switchboard. And the disconnection mechanism is provided so that connection with the busbar by moving the drawer-type electrical device in the depth direction (injection) and disconnection from the busbar by moving in the front direction (disconnection) can be easily performed. .

  In addition, a guide rail is provided on the floor surface of the switchboard, and a wheel attached to the carriage is moved along the guide rail so that it can be easily turned on and off.

  A conventional configuration will be described with reference to FIG. Inside the switchboard 1 is housed a drawer truck frame 3 on which a transformer 2 is mounted. Wheels 4 are attached to the lower part of the drawer truck frame 3. A guide rail 6 is provided on the inner floor surface of the switchboard 1. By moving the drawer carriage frame 3 along the guide rail 6, the transformer 2 can be easily put in and out of the switchboard 1. In addition, the main contact 12 and the bus bar-side conductor 9 can be easily inserted and disconnected.

  A transformer-side conductor 11 is attached to the drawer truck frame 3 via a transformer-side insulator 10 and is electrically connected to the transformer 2. A box frame 5 is attached in the switchboard 1. A bus-side conductor 9 is attached to the box frame 5 via a bus-side insulator 8, and a bus 7 is connected to the bus-side conductor 9.

  FIG. 5 shows the details of part A of FIG. The disconnecting mechanism will be described with reference to FIG. A bus bar side insulator 8 is attached to the box frame 5 provided in the switchboard 1, and one end of an L-shaped bus side conductor 9 is attached to the bus side insulator 8 with the transformer side conductor 11 facing. It has been. Further, a transformer-side insulator 10 is attached to the drawer cart frame 3, and one end of an L-shaped transformer-side conductor 11 is attached to the transformer-side insulator 10 so as to face the bus-side conductor 9. . The one end of the bus-side conductor 9 and the end of the one end of the transformer-side conductor 11 are attached so as to face each other.

  A main contact 12 is attached to the tip of one end of the transformer-side conductor 11 with a fixing bolt 14 via a contact pressure spring 13. The main contact 12 has a structure in which a thin plate is folded back into a hairpin shape, and its tip is slightly open. This serves as a guide when the front end of the bus-side conductor 9 is inserted into the main contact 12.

JP 2008-67422 A JP 2000-182481 A

  The conventional disconnection mechanism is provided for easily disconnecting a lead-out type electrical device such as a transformer from the busbar when pulling it out of the switchboard, and has a cutoff performance such as an excitation current of the transformer. Do not mean. There is no problem if a lead-out type electrical device such as a transformer is pulled out from the switchboard if it can be pulled out at a speed at which the excitation current can be cut off. However, this depends on the skill of the operator who pulls out the drawer-type electrical equipment. Therefore, it has been necessary to make the disconnecting mechanism portion non-voltage in order to safely pull out the drawer-type electrical device from the inside of the switchboard.

  It is common to provide a disconnecting device such as a cut-out switch on the busbar side in order to make the disconnecting mechanism portion non-voltage. However, there is a problem that disconnection operation such as a cutout switch is necessary before the drawing work, and the operation procedure is increased and the operation becomes complicated. In addition, it is necessary to consider the storage of disconnecting devices such as cutout switches and the securing of the operation space, and there is a problem that the switchboard is increased in size and cost.

  The present invention provides a disconnecting mechanism for a lead-type electrical device such as a transformer housed in a distribution board, and is attached to a bus-side conductor, a main contact attached to the transformer-side conductor, and the bus-side conductor. An extension conductor, a fixed arc contact attached to the extension conductor, a contact bar attached to the fixed arc contact, a fixation pin attached to the transformer-side conductor, and a torsion coil spring through the fixation pin The movable arc contact is rotated around the fixed pin when the movable arc contact contacts the contact rod during disconnection operation, and the torsion coil spring is accumulated. The movable arc contact is disconnected from the fixed arc contact by the stored force of the torsion coil spring after the main contact is disconnected from the bus side conductor. Is the fact characterized.

  The disconnecting mechanism can be operated at a stable speed without depending on the pulling speed of the drawer-type electrical device such as a transformer. Therefore, stable current interruption performance can be ensured, so that it is possible to draw out an electrical appliance such as a transformer without a power failure, and there is an advantage that the maintainability of the electrical appliance such as a transformer is improved. In addition, since it is not necessary to install a disconnecting device such as a cutout switch, there is an advantage that the switchboard can be downsized and the cost can be reduced.

  In addition, the movable arc contact portion of the disconnecting mechanism is simple and compact, and can be attached to a conventional product with minimal component replacement. Furthermore, the movable arc contact can be reliably disconnected after the main contact is disconnected by providing the contact bar on the fixed contact.

1A and 1B are diagrams showing a configuration of the present invention, in which FIG. 1A is a plan view and FIG. 1B is a front view. 2A and 2B are views showing the operation of the present invention, where FIG. 2A is a plan view and FIG. 2B is a front view. 3A and 3B are diagrams showing the operation of the present invention, in which FIG. 3A is a plan view and FIG. 3B is a front view. FIG. 4 is a schematic diagram of the configuration of a conventional switchboard. 5A and 5B are diagrams showing details of the portion A in FIG. 4, where FIG. 5A is a plan view and FIG. 5B is a front view.

  A bus-side conductor, a main contact attached to the transformer-side conductor, an extension conductor attached to the bus-side conductor, a fixed arc contact attached to the extension conductor, and an attachment to the fixed arc contact A movable arc contact attached to the fixed pin via a torsion coil spring, and the movable arc contact is in contact with the movable arc contact during disconnection operation. The movable arc contact rotates around the fixed pin by hitting the rod, and the torsion coil spring is stored, and after the main contact is disconnected from the bus-side conductor, the stored force of the torsion coil spring The movable arc contact is disconnected from the fixed arc contact.

  FIG. 1 is a detailed view of a disconnecting mechanism portion according to an embodiment of the present invention, showing a state in which a transformer is housed inside a switchboard. The configurations of the main contact portions 1 to 14 are the same as the conventional configurations of FIGS. 4 and 5.

  An extension conductor 15 is attached to the bus bar side conductor 9. The extension conductor 15 is bent in an L shape, and is fixed to the bus side conductor 9 so that the tip on one end side faces the transformer side conductor 11. An upper fixed arc contact 16 and a lower fixed arc contact 17 are attached to one end of the extension conductor 15 by an arc contact fixing bolt 20 so as to sandwich the extension conductor 15. At that time, an arc contact pressure spring 19 is inserted between the upper fixed arc contact 16 and the arc contact fixing bolt 20. Further, a connection pin 21 is provided so that the upper fixed arc contact 16 and the lower fixed arc contact 17 do not rotate around the arc contact fixing bolt 20.

  A contact bar 18 is attached to the upper fixed arc contact 16 so as to maintain a constant distance from the lower fixed arc contact 17. Further, the contact bar 18 is formed obliquely so that the width becomes narrower toward the lower fixed arc contact 17. By configuring the contact rod 18 in this way, the movable arc contact 22 can be disconnected after the main contact is reliably disconnected at the time of disconnection operation, and the movable arc contact 22 is connected to the contact rod 18 at the closing operation. You can dive through the bottom. Further, the tip of the lower fixed arc contact 17 is bent into a slightly open shape. This serves as a guide when the movable arc contact 19 is inserted.

  An L-shaped movable arc contact 22 is attached to the transformer-side conductor 11 with a fixed pin 24 via a torsion coil spring 23 in addition to the main contact 12 configured in the same manner as in the prior art. A stopper 25 is attached to the transformer-side conductor 11. The stopper 25 prevents the movable arc contact 22 from rotating clockwise by the torsion coil spring 23 when the end of the movable arc contact 22 hits.

  Next, operation | movement of the movable arc contactor 22 at the time of disconnection operation is demonstrated using FIG. The transformer is gradually pulled out from the state in which the transformer is housed inside the switchboard (in the figure, the transformer-side conductor 11 portion moves to the left). With this drawing, the movable arc contact 22 comes into contact with the contact rod 18 attached to the upper fixed arc contact 16. When the drawing is continued, the movable arc contact 22 moves so as to slide along the contact bar 18 while rotating counterclockwise. At this time, the torsion coil spring 23 is stored by rotating the movable arc contact 22 counterclockwise. During this operation, the main contact 12 is gradually separated from the bus-side conductor 9.

  Further, when the transformer is pulled out, the state shown in FIG. 2 is obtained. This state is a state in which the main contact 12 is completely disconnected from the bus-side conductor 9 and the tip of the movable arc contact 22 is barely caught by the contact rod 18.

  When the transformer is further pulled out from the state of FIG. 2, the tip portion of the movable arc contact 22 is detached from the contact bar 18. Then, the stored force of the torsion coil spring 23 is released, and the movable arc contact 22 rotates in the clockwise direction. When the movable arc contact 22 rotated in the clockwise direction hits the stopper 25, the rotation stops and the disconnection is completed. FIG. 3 shows a state in which this disconnection is completed.

  Next, connection with the bus bar by moving the drawer-type electrical device in the depth direction will be described. When the transformer is pulled out from the state shown in FIG. 3 gradually into the switchboard (in the figure, the transformer-side conductor 11 moves to the right), the movable arc contact 22 comes into contact. Hit the stick 18 However, since the movable arc contact 22 is restricted by the stopper 25 from rotating in the clockwise direction, the movable arc contact 22 pushes the contact bar 18. The contact bar 18 is pressed by the fixed arc contact pressure spring 19 so as to contact the lower fixed arc contact 17, but the portion where the contact bar 18 contacts the movable arc contact 22 is formed obliquely. The contact bar 18 is pushed up against the fixed arc contactor contact spring 19. The movable arc contact 22 passes through the lower part of the pushed up contact bar 18 and moves to the opposite side. At the same time, the bus bar side conductor 9 is inserted into the main contact 12 to complete the insertion.

DESCRIPTION OF SYMBOLS 1 Switchboard 2 Transformer 3 Pull-out trolley frame 4 Wheel 5 Box frame 6 Guide rail 7 Bus-bar 8 Bus-side insulator 9 Bus-side conductor 10 Transformer-side insulator 11 Transformer-side conductor 12 Main contact 13 Contact pressure spring 14 Fixing bolt 15 Extension conductor 16 Upper fixed arc contact 17 Lower fixed arc contact 18 Contact rod 19 Fixed arc contact pressure spring 20 Fixed arc contact fixing bolt 21 Connection pin 22 Movable arc contact 23 Torsion coil spring 24 Fixed pin 25 Stopper

Claims (1)

  In the disconnecting mechanism of a lead-out type electrical device such as a transformer housed inside the switchboard, the bus-side conductor, the main contact attached to the transformer-side conductor, and the extension conductor attached to the bus-side conductor; A fixed arc contact attached to the extension conductor, a contact rod attached to the fixed arc contact, a fixed pin attached to the transformer side conductor, and a fixed coil attached to the fixed pin via a torsion coil spring A movable arc contact is provided, and at the time of disconnection operation, when the movable arc contact hits the contact rod, the movable arc contact rotates around the fixed pin, and the torsion coil spring is stored, and the bus side The movable arc contact is disconnected from the fixed arc contact by the stored force of the torsion coil spring after the main contact is disconnected from the conductor, Disconnecting mechanism of drawer-type electric device, wherein the door.

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