JP2018073482A - Switchgear with rush current suppressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the size of a switchgear with rush current suppressor.SOLUTION: A movable contact operated in accordance with rotation of an arm 24 during an input state is contacted with a main contact 19 and an auxiliary contact 21 after contact of a resistance contact 20 in a state of being contacted to the resistance contact 20. In the input state where a load device is inputted to a power supply, the movable contact is engaged with at least the main contact 19 and the auxiliary contact 21. During opening operation that the load device is separated from the power supply, the movable contact operated in accordance with the rotation of the arm 24 is separated from the auxiliary contact 21 after separation of the main contact 19 and the resistance contact 20. an arc-extinguishing chamber 14 which extinguishes arcs generated when the movable contact is separated from the auxiliary contact 21. A resistance element provided between the resistance contact 20 and a primary terminal 11 is covered with a cover 16 having an insulation quality, and is provided at a position near from the arc-extinguishing chamber 14 to a main surface 10a.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a switch with an inrush current suppressing device that suppresses generation of an exciting inrush current.

  When the load device is put into the power system, an inrush current may occur. For example, when a transformer is put into a power system, an excitation inrush current that is several to several tens of times the rated current of the transformer may temporarily flow. Due to the magnetizing inrush current, the voltage of the power system temporarily decreases, the function of the precision equipment connected to the power system is lost, the malfunction of the protective relay of the power system, or the neighborhood demand connected to the power system There may be voltage fluctuations at home. The magnitude and duration of the magnetizing inrush current depend on the saturation characteristics of the iron core, the residual magnetic flux of the iron core, the applied phase, or the impedance of the transformer.

  The switch disclosed in Patent Literature 1 includes a resistor connected to an auxiliary electrode disposed in the arc extinguishing chamber. When the movable electrode is brought into contact with the auxiliary electrode when the switch is turned on, it is possible to suppress the occurrence of the magnetizing inrush current.

Japanese Patent Laying-Open No. 2015-133263

  The switch is installed on a transformer inside the high-voltage power receiving facility cubicle or inside the indoor electric room. For this reason, a reduction in vertical dimension is required. In the switch disclosed in Patent Document 1, the resistor is installed to be inclined on the side surface of the arc extinguishing chamber in the phase direction. In the switch, the distal end portion of the resistor is positioned above the power supply side connection terminal in the vertical direction. For this reason, there is a possibility that the switch disclosed in Patent Document 1 cannot be installed at a place where the vertical dimension is restricted.

  This invention is made | formed in view of the above-mentioned situation, and aims at size reduction of the switch with an inrush current suppression apparatus.

  To achieve the above object, a switch with an inrush current suppression device according to the present invention includes a primary terminal, a secondary terminal, a main contact, an arc extinguishing chamber, an auxiliary contact, a resistance element, a resistance side contact, an arm, and a movable contactor. Is provided. The primary terminal is attached to the main surface of the base and is electrically connected to the power source. The secondary terminal is electrically connected to the load device. The main contact is electrically connected to the primary terminal. The arc extinguishing chamber is composed of a member having arc extinguishing properties and insulating properties. The auxiliary contact is electrically connected to the primary terminal and is provided inside the arc extinguishing chamber. The resistance element is provided at a position closer to the main surface than the arc extinguishing chamber, is covered with an insulating cover, and one end is electrically connected to the primary terminal. The resistance side contact is electrically connected to the other end of the resistance element. The arm is supported so as to be rotatable with respect to the base around a fulcrum provided on the base. The movable contact is attached to the arm, electrically connected to the secondary terminal, and moves according to the rotation of the arm to contact the main contact, the resistance side contact, and the auxiliary contact. When the load device is turned on, the movable contact that moves according to the rotation of the arm contacts the resistance side contact and then contacts the main contact and auxiliary contact in contact with the resistance side contact. When the power is turned on, the movable contact engages with at least the main contact and the auxiliary contact. During the opening operation of disconnecting the load device from the power source, the movable contact that moves according to the rotation of the arm is detached from the auxiliary contact after being detached from the main contact and the resistance side contact. The arc extinguishing chamber extinguishes an arc generated when the movable contact is detached from the auxiliary contact during the opening operation.

  According to the present invention, it is possible to reduce the size of the switch with an inrush current suppressing device by providing the resistance element covered with the insulating cover at a position closer to the main surface of the base than the arc extinguishing chamber.

Front view of a switch according to an embodiment of the present invention Side view of switch according to embodiment Side view of switch according to embodiment Top view of the switch according to the embodiment The side view in the open state of the switch concerning an embodiment The side view in the open state of the switch concerning an embodiment The perspective view which shows the example of arrangement | positioning of the resistive element in the switch which concerns on embodiment The perspective view which shows the example of arrangement | positioning of the resistive element in the switch which concerns on embodiment Partial sectional view of a switch according to an embodiment Partial sectional view of a switch according to an embodiment The figure which shows the motion at the time of closing operation of the switch concerning an embodiment The figure which shows the motion at the time of closing operation of the switch concerning an embodiment The figure which shows the motion at the time of closing operation of the switch concerning an embodiment The figure which shows the motion at the time of opening operation | movement of the switch concerning an embodiment The figure which shows the motion at the time of opening operation | movement of the switch concerning an embodiment Partial sectional view of a switch according to an embodiment Partial sectional view of a switch according to an embodiment Partial sectional view of a switch according to an embodiment Partial sectional view of a switch according to an embodiment

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or equivalent parts are denoted by the same reference numerals.

  FIG. 1 is a front view of a switch according to an embodiment of the present invention. A switch 1 with an inrush current suppression device (hereinafter referred to as switch 1) is provided between a power source (not shown) and a load device. The switch 1 is provided between a power source and a load device that is, for example, a three-phase transformer. In the present embodiment, primary terminal 11 provided on main surface 10a of base 10 is electrically connected to the power source, and secondary terminal 12 is electrically connected to the load device. In the example of FIG. 1, the direction orthogonal to the main surface 10a is defined as the Y-axis direction. The interval direction between the primary terminal 11 and the secondary terminal 12 is the Z-axis direction. A direction orthogonal to the Y-axis direction and the Z-axis direction is taken as an X-axis direction. 2 and 3 are side views of the switch according to the embodiment. FIG. 2 is a side view seen from the positive direction of the X axis. FIG. 3 is a side view seen from the negative X-axis direction. FIG. 4 is a top view of the switch according to the embodiment.

  When the switch 1 is turned on, the load device is turned on. The load device is disconnected from the power source by opening the switch 1. FIG. 1 to FIG. 4 are diagrams in a turned-on state in which the load device is turned on. 5 and 6 are side views of the switch according to the embodiment in the opened state. FIG. 5 is a side view seen from the positive direction of the X axis. FIG. 6 is a side view seen from the negative X-axis direction.

  The switch 1 includes a main contact 19, a resistance side contact 20, and an auxiliary contact 21 that are electrically connected to the primary terminal 11. The auxiliary contact 21 is provided inside the arc extinguishing chamber 14 formed of a member having arc extinguishing properties and insulating properties. The switch 1 includes a resistance element 17 that is covered with an insulating cover 16 and is provided at a position closer to the main surface 10 a than the arc extinguishing chamber 14. One end of the resistance element 17 is electrically connected to the primary terminal 11, and the other end is electrically connected to the resistance side contact 20. The switch 1 further includes an arm 24 that is instructed to be rotatable with respect to the base 10 around a fulcrum 25 provided on the base 10. A movable contact 15 is attached to the arm 24, and the movable contact 15 moves as the arm 24 rotates. The movable contact 15 is electrically connected to the secondary terminal 12. In the present embodiment, the movable contact 15 is electrically connected to the secondary terminal 12 via the fuse link 13. A conductor may be used instead of the fuse link 13. The movable contact 15 contacts the main contact 19, the resistance side contact 20, and the auxiliary contact 21 by moving according to the rotation of the arm 24.

  In response to the operation of the electric operation mechanism unit 18, the switch 1 performs a closing operation for turning on the load device to the power source and an opening operation for disconnecting the load device from the power source. During the closing operation, the movable contact 15 that moves according to the rotation of the arm 24 contacts the resistance-side contact 20, and then contacts the main contact 19 and the auxiliary contact 21 while being in contact with the resistance-side contact 20. When the load device is turned on, the movable contact 15 engages with at least the main contact 19 and the auxiliary contact 21, respectively. During the opening operation, the movable contact 15 that moves according to the rotation of the arm 24 is detached from the auxiliary contact 21 after being separated from the main contact 19 and the resistance-side contact 20. The arc extinguishing chamber 14 extinguishes an arc generated when the movable contact 15 is detached from the auxiliary contact 21 during the opening operation.

  In the example of FIGS. 1 to 6, the main contact 19 and the resistance side contact 20 are provided on the secondary terminal 12 side of the arc extinguishing chamber 14. One end of the arm 24 is fixed to the fulcrum 25, so that the other end is rotatably supported. During the closing operation, the arm 24 rotates around the one end fixed to the fulcrum 25 in the first direction indicated by the dashed arrow in FIGS. 5 and 6. The movable contact 15 is attached to the other rotating end of the arm 24, and engages with the main contact 22 that engages with the main contact 19 in the closed state, and with each of the resistance side contact 20 and the auxiliary contact 21 in the closed state. It is comprised with the plate-shaped auxiliary contact 23 to do. The auxiliary contactor 23 is attached to the arm 24 so as to be rotatable between a starting point whose longitudinal direction coincides with the longitudinal direction of the arm 24 and an end point that is a position rotated in the first direction from the starting point.

  The switch 1 further includes a spring 26 having one end attached to the arm 24 and the other end attached to the auxiliary contact 23, and biasing the auxiliary contact 23 against the arm 24 in the direction opposite to the first direction. . The spring 26 is a torsion coil spring, for example. The switch 1 may include a restricting portion attached to the arm 24 that restricts the auxiliary contactor 23 from rotating beyond the end point in the first direction. During the closing operation, the auxiliary contact 23 rotates in the first direction integrally with the arm 24, and after the auxiliary contact 23 comes into contact with the resistance side contact 20, the distal end portion 231 of the auxiliary contact 23 becomes the auxiliary contact 21. The main contact 22 comes into contact with the main contact 19. During the opening operation, the main contact 22 is detached from the main contact 19 by rotating the arm 24 in the direction opposite to the first direction in a state where the tip portion 231 of the auxiliary contact 23 is in contact with the auxiliary contact 21. The auxiliary contact 23 is detached from the resistance side contact 20. Furthermore, the arm 24 rotates in the direction opposite to the first direction, and the arm 24 rotates to a predetermined position. When the arm 24 is rotated to a predetermined position, the auxiliary contact 23 is located at the end point. When the arm 24 is rotated to a predetermined position, the auxiliary contact 23 urged by the spring 26 or pushed up in the direction opposite to the first direction by the restricting portion is moved in the first direction with respect to the arm 24. It rotates in the opposite direction and quickly leaves the auxiliary contact 21.

  In the present embodiment, the auxiliary contactor 23 is branched into a first direction and a direction opposite to the first direction at a position extending in the longitudinal direction of the arm 24 from a position attached to the arm 24. The branch in the first direction forms a protrusion 232 that engages the resistance side contact 20 in the closed state. The branch in the direction opposite to the first direction extends in the longitudinal direction of the arm 24 at a position that extends in the direction opposite to the first direction and then curves in the first direction.

  7 and 8 are perspective views showing examples of arrangement of the resistance elements in the switch according to the embodiment. 9 and 10 are partial cross-sectional views of the switch according to the embodiment. FIG. 9 is a diagram showing a part of a cross section taken along line AA in FIG. 10 is a cross-sectional view taken along line BB in FIG. 7 to 10, only the periphery of the arc extinguishing chamber 14 and the resistance element 17 is shown. The arc extinguishing chamber 14 is attached to the main surface 10a via the plate 141. An opening 142 is formed on the surface of the arc extinguishing chamber 14 that faces the auxiliary contact 23 in the open state. The surface of the arc extinguishing chamber 14 facing the main contact 19 and the resistance side contact 20 is closed. As described above, since the auxiliary contact 23 has a shape that extends in the direction opposite to the first direction and then curves in the first direction, the main contact 19 and the resistance-side contact 20 of the arc extinguishing chamber 14 are formed. The front end portion 231 of the auxiliary contact 23 can contact the auxiliary contact 21 without providing an opening on the surface facing the auxiliary contact 23. Thereby, the arc extinguishing performance of the arc extinguishing chamber 14 can be improved. The resistance side contact 20 is fixed to the arc extinguishing chamber 14 by a fastening member that extends in the Z-axis direction (not shown).

  The resistance element 17 is, for example, a ceramic resistor. In the present embodiment, the direction in which the electrodes of the resistance element 17 face each other is the X-axis direction. The electrodes of the resistance element 17 are covered with metal lids 171a and 171b, respectively. A space between the electrodes of the resistance element 17 is covered with a resistance element cover 172 made of porcelain or resin. One electrode of the resistance element 17 is electrically connected to the resistance side contact 20 by the mounting plate 173a. The other electrode of the resistance element 17 is electrically connected to the primary terminal 11 by the mounting plate 173b. The resistance element 17 is fixed to the plate 141 by the mounting plates 173a and 173b. Instead of the mounting plates 173a and 173b, the resistance element 17 may be electrically connected to each of the resistance side contact 20 and the primary terminal 11 using a conductor. In that case, the resistance element 17 is fixed to the plate 141 by a member having no conductivity. By covering the resistance element 17 with an insulating cover 16 and providing it at a position closer to the main surface 10a than the arc extinguishing chamber 14, the size of the switch 1 in the Z-axis direction can be reduced. It is possible to reduce the size.

  FIG. 11 to FIG. 13 are diagrams illustrating the movement during the closing operation of the switch according to the embodiment. In FIGS. 11 to 13, only the periphery of the movable contact 15 and the main contact 19, the resistance side contact 20, and the auxiliary contact 21 constituted by the main contact 22 and the auxiliary contact 23 is described. The arc extinguishing chamber 14 is attached to the arc extinguishing chamber base 143. Note that the arc extinguishing chamber 14 is omitted from FIGS. During the closing operation, the auxiliary contact 23 rotates in the first direction integrally with the arm 24. As shown in FIG. 11, the protrusion 232 of the auxiliary contact 23 contacts the resistance side contact 20. Thereafter, as shown in FIG. 12, the tip portion 231 of the auxiliary contact 23 comes into contact with the auxiliary contact 21. Then, as shown in FIG. 13, the main contact 22 contacts the main contact 19. The main contact 19 and the resistance side contact 20 have a clip shape that presses in the X-axis direction. With this shape, the main contact 22 engages with the main contact 19 and the protrusion 232 of the auxiliary contact 23 engages with the resistance-side contact 20 in the closing state. A flat plate inclined with respect to the Y-axis direction is provided at the tip of the auxiliary contact 21. In the charged state, the tip portion 231 of the auxiliary contact 23 is engaged with the auxiliary contact 21 by the tip portion 231 of the auxiliary contact 23 being locked to the flat plate.

  14 and 15 are diagrams illustrating the movement of the switch according to the embodiment during the opening operation. The way of viewing the figure is the same as in FIGS. During the opening operation, the arm 24 rotates in the direction opposite to the first direction in a state where the tip portion 231 of the auxiliary contact 23 is in contact with the auxiliary contact 21, and as shown in FIG. Is detached from the main contact 19. Here, since the tip end portion 231 is engaged with the auxiliary contact 21, the auxiliary contact 23 rotates in the first direction with respect to the arm 24 against the urging force of the spring 26 by the rotation of the arm 24. Move. As a result, the protrusion 232 is detached from the resistance side contact 20 in a state where the tip portion 231 is in contact with the auxiliary contact 21. Further, when the arm 24 rotates in the direction opposite to the first direction and the arm 24 rotates to a predetermined position, the urging force of the spring 26 overcomes the engagement force between the tip portion 231 and the auxiliary contact 21, Alternatively, the restricting portion of the arm 24 abuts on the auxiliary contact 23 and pushes up the auxiliary contact 23 in the direction opposite to the first direction, so that the tip portion 231 is detached from the auxiliary contact 21. When the distal end portion 231 is separated from the auxiliary contact 21, the auxiliary contact 23 biased by the spring 26 rotates with respect to the arm 24 in the direction opposite to the first direction. The auxiliary contact 23 rotates in the direction opposite to the first direction with respect to the arm 24 by the urging force of the spring 26, so that the tip portion 231 of the auxiliary contact 23 is rapidly detached from the auxiliary contact 21. The arc extinguishing chamber 14 extinguishes an arc generated when the auxiliary contact 23 biased by the spring 26 is detached from the auxiliary contact 21.

  16 to 19 are partial cross-sectional views of the switch according to the embodiment. The way of viewing the figure is the same as in FIGS. 9 and 10. 17 is a cross-sectional view taken along line CC in FIG. 19 is a cross-sectional view taken along line DD in FIG. In the example of FIGS. 16 and 17, unlike the above-described embodiment, the electrode direction of the resistance element 17 is the Y-axis direction. In the example of FIGS. 18 and 19, unlike the above-described embodiment, the electrode direction of the resistance element 17 is the Z-axis direction. In any case, since the resistance element 17 is covered with the insulating cover 16 and provided at a position closer to the main surface 10a than the arc extinguishing chamber 14, the switch 1 can be downsized.

  As described above, according to the switch 1 according to the embodiment of the present invention, the resistance element 17 is covered with the insulating cover 16 and provided at a position closer to the main surface 10a than the arc extinguishing chamber 14, thereby opening and closing. The device 1 can be downsized.

  The embodiment of the present invention is not limited to the above-described embodiment. The shape of the movable contact 15 is not limited to the above-described embodiment. Further, the shape of the auxiliary contact 23 is not limited to the above-described embodiment.

  DESCRIPTION OF SYMBOLS 1 Switch, 10 base, 10a Main surface, 11 Primary terminal, 12 Secondary terminal, 13 Fuse link, 14 Arc extinguishing chamber, 15 Movable contact, 16 Cover, 17 Resistance element, 18 Electric operation mechanism part, 19 Main contact , 20 resistance side contact, 21 auxiliary contact, 22 main contact, 23 auxiliary contact, 24 arm, 25 fulcrum, 26 spring, 141 plate, 142 opening, 143 arc extinguishing chamber base, 171a, 171b metal lid, 172 resistance Element cover, 173a, 173b mounting plate, 231 tip portion, 232 protrusion.

Claims (7)

A primary terminal attached to the main surface of the base and electrically connected to the power source;
A secondary terminal electrically connected to the load device;
A main contact electrically connected to the primary terminal;
An arc extinguishing chamber composed of members having arc extinguishing properties and insulating properties;
An auxiliary contact electrically connected to the primary terminal and provided inside the arc-extinguishing chamber;
A resistance element provided at a position closer to the main surface than the arc extinguishing chamber, covered with an insulating cover, and one end electrically connected to the primary terminal;
A resistance-side contact electrically connected to the other end of the resistance element;
An arm that is rotatably supported with respect to the base around a fulcrum provided on the base;
A movable contact that is attached to the arm, is electrically connected to the secondary terminal, and moves according to the rotation of the arm to contact the main contact, the resistance-side contact, and the auxiliary contact;
With
During the turning-on operation of turning on the load device to the power source, the movable contact that moves according to the rotation of the arm contacts the resistance-side contact and then contacts the resistance-side contact and then the main contact and the auxiliary The movable contact engages with each of at least the main contact and the auxiliary contact in a closing state where the load device is in contact with the contact and the load device is turned on to the power source,
During the opening operation of disconnecting the load device from the power source, the movable contact that moves according to the rotation of the arm is detached from the main contact and the resistance-side contact, and then separated from the auxiliary contact.
The arc extinguishing chamber extinguishes an arc generated when the movable contact is detached from the auxiliary contact during the opening operation;
Switch with inrush current suppression device. The main contact and the resistance side contact are provided on the secondary terminal side of the arc extinguishing chamber,
One end of the arm is fixed to the fulcrum, and the other end is rotatably supported.
The movable contact is
A main contact that is attached to the other end of the arm and that engages the main contact in the closing state;
The arm can be pivoted between a start point where the longitudinal direction coincides with the longitudinal direction of the arm and an end point which is a position rotated from the start point to a first direction in which the arm rotates during the loading operation. A plate-like auxiliary contact that is attached and engages with each of the resistance-side contact and the auxiliary contact in the input state;
Have
One end is attached to the arm, the other end is attached to the auxiliary contact, and further includes a spring that biases the auxiliary contact with respect to the arm in a direction opposite to the first direction,
During the closing operation, the auxiliary contact rotates in the first direction integrally with the arm, and after the auxiliary contact contacts the resistance side contact, the main contact contacts the main contact. The tip of the auxiliary contact is in contact with the auxiliary contact;
At the time of the opening operation, in a state where the tip portion of the auxiliary contact is in contact with the auxiliary contact, the main contact is detached from the main contact by rotating the arm to a predetermined position, After the auxiliary contact is detached from the resistance side contact and the arm is rotated to the predetermined position, the auxiliary contact is rotated in a direction opposite to the first direction with respect to the arm, Leaving the auxiliary contact,
The switch with an inrush current suppression device according to claim 1.   The auxiliary contact is branched from the position attached to the arm in the longitudinal direction of the arm into the first direction and the direction opposite to the first direction, The branch forms a protrusion that engages with the resistance-side contact in the closing state, and the branch in the direction opposite to the first direction extends in the direction opposite to the first direction and then the first direction. The switch with an inrush current suppression device according to claim 2, which extends in a longitudinal direction of the arm at a position curved toward the direction.   The arc-extinguishing chamber has an open surface facing the auxiliary contact in an open state where the load device is disconnected from the power source, and a surface facing the main contact and the resistance-side contact is closed. The switch with an inrush current suppression device according to claim 2 or 3.   5. The direction according to claim 1, wherein a direction in which the electrodes of the resistance element oppose each other is a direction orthogonal to a spacing direction between the primary terminal and the secondary terminal and parallel to the main surface. Switch with inrush current suppression device.   The switch with an inrush current suppression device according to any one of claims 1 to 4, wherein a direction in which the electrodes of the resistance element face each other is a direction orthogonal to the main surface.   5. The inrush current suppression according to claim 1, wherein a direction in which the electrodes of the resistance element oppose each other is a direction parallel to each of a distance direction between the primary terminal and the secondary terminal and the main surface. Switch with device.

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