JP4711726B2 - Switchgear and interlock device thereof - Google Patents

Description

  The present invention relates to an opening / closing device that opens a pair of contacts using an electromagnetic repulsion mechanism and an interlock device when the opening / closing device is located at a connection position and a disconnection position.

2. Description of the Related Art Conventionally, in a switchgear using a pair of contactable contacts such as a vacuum valve, when opening the contact, it is required to quickly open the contact in order to reduce contact consumption due to arcing. As this drive source, one that uses an electromagnetic repulsion mechanism that uses a precharged capacitor charge as a power source in addition to a spring is known (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 11-25817 (3rd page, FIG. 1)

The above-described conventional switchgear has the following problems.
When performing maintenance and inspection by pulling out a switchgear using an electromagnetic repulsion mechanism from the main circuit of an electrical device such as a switchgear, grounding work is required when electric charge remains in the capacitor, and maintenance and inspection work is easy. It was difficult to do. This capacitor had a capacitance of several thousand μF, a large discharge current, and the grounding work itself was difficult.

  For this reason, it has been desired that the capacitor can be charged when the switchgear is in the connected position, and that the capacitor can be easily discharged when in the disconnected position.

  The present invention has been made to solve the above-described problem, and it is an object of the present invention to easily discharge a capacitor when the switchgear is in a disconnected position, thereby facilitating maintenance and inspection work.

In order to achieve the above object, a switchgear according to the present invention includes a pair of contactable and separable contacts, an electromagnetic repulsion mechanism that opens the pair of contacts with an electromagnetic repulsive force, an operation mechanism that opens and closes the pair of contacts, Capacitor for driving the electromagnetic repulsion mechanism, a discharge switch connected between terminals of the capacitor, an opening holding means for keeping the discharge switch in an open state, and the discharge switch can be in a closed state The discharge switch is a vacuum bulb having a pair of contact points that can be freely separated from each other .

  According to the present invention, when the switchgear provided with the capacitor is pulled out from the electrical equipment, if the discharge switch connected between both terminals of the capacitor is in the open state, the switchgear is prevented from moving at the disconnection position. If the discharge switch is in a closed state, the switchgear can be pulled out of the electrical equipment, so that the charge of the capacitor can be surely discharged to facilitate maintenance and inspection work.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, the switchgear according to Embodiment 1 of the present invention will be described with reference to FIGS. FIG. 1 is a diagram illustrating a configuration of a switchgear according to Embodiment 1 of the present invention, FIG. 2 is a cross-sectional view illustrating a configuration of a discharge device according to Embodiment 1 of the present invention, and FIG. FIG. 4 is a cross-sectional view illustrating the operation of the discharge device at the connection position according to Example 1, FIG. 4 is a cross-sectional view illustrating the interlock operation of the discharge device at the connection position according to Embodiment 1 of the present invention, and FIG. It is a figure explaining operation | movement of the discharge device in the disconnection position which concerns on Example 1. FIG.

  As shown in FIG. 1, the opening / closing device includes a main circuit portion 1 a having an electromagnetic repulsion mechanism and a power supply portion 1 b that supplies power to the electromagnetic repulsion mechanism. The main circuit portion 1a is divided into an upper blocking portion 2a, an intermediate wipe spring portion 2b, and an operation mechanism portion 2c in the lower portion.

  The blocking portion 2a is provided with a vacuum valve 5 having a pair of contact points 3 and 4 that can be contacted and separated. A fixed side conductor 6 fixed to the fixing member of the switchgear and a movable side conductor 7 fixed to the fixing member are fixed to the vacuum valve 5. A slide contact 8 is provided at each end of the fixed-side conductor 6 and the movable-side conductor 7. Each slide contact 8 is in sliding contact with a main circuit terminal 9 of an electric device such as a switch gear.

  The wipe spring portion 2b is provided with a first movable shaft 10 which is connected to the movable shaft of the vacuum valve 5 and slidably contacts the movable side conductor 7 so as to pass therethrough. One end of the insulating operation rod 11 is fixed to the end of the first movable shaft 10, and the second movable shaft 12 is fixed to the other end. The second movable shaft 12 is connected to a wipe spring folder 14 that houses a wipe spring 13 that applies a contact load when the pair of contacts 3 and 4 are in contact with each other.

  The operation mechanism unit 2 c is provided with a third movable shaft 15 connected to the wipe spring folder 14, and is connected to an operation mechanism 16 such as an electromagnetic actuator that opens and closes the pair of contacts 3 and 4. Between the wipe spring folder 14 and the operation mechanism 16, there is provided an electromagnetic repulsion coil 18 that is covered with an insulating material 17 with an insulating material through which the third movable shaft 15 is movably penetrated. The electromagnetic repulsion coil 18 is fixed to a fixing member of the switchgear. Further, a repulsion ring 19 fixed to the third movable shaft 15 is fixed to the operation mechanism 16 side facing the electromagnetic repulsion coil 18. The electromagnetic repulsion coil 18 and the repulsion ring 19 constitute an electromagnetic repulsion mechanism, and the pair of contacts 3 and 4 can be quickly opened by the electromagnetic repulsion force.

  The operation mechanism 16 is placed on the carriage 20. The carriage 20 is provided with wheels 21 so as to be movable on the floor plate 22 of the electrical equipment.

  The power supply unit 1 b is provided with a capacitor 24 that excites the electromagnetic repulsion coil 18 in a frame 23 placed on the carriage 20. A thyristor switch 25 is connected in series between the capacitor 24 and the electromagnetic repulsion coil 18. The capacitor 24 is charged from an external DC power supply 27 via a charge switch 26. A discharge device 30 having a discharge switch 29 that discharges the electric charge of the capacitor 24 via the discharge resistor 28 is provided between the terminals of the capacitor 24.

  A first block 31 and a second block 32 are fixed to the floor plate 22 on the main circuit portion 1a side and the opposite main circuit portion 1a side with the discharge device 30 interposed therebetween. The blocks 31 and 32 become an interlock device described later that restricts the operation of the discharge switch 29 in combination with the discharge device 30 when the switchgear is in the connection position and the disconnection position.

  In FIG. 1, the switchgear is in the disconnect position. On the other hand, the position at which the opening / closing device is moved to the right in the figure and the slide contact 8 is connected to the main circuit terminal 9 as indicated by the dotted line is the connection position.

  Next, the discharge device 30 will be described with reference to FIG.

  As shown in FIG. 2, the discharge device 30 includes a discharge switch part 40a and a link mechanism part 40b.

  The discharge switch section 40a is provided with a discharge switch 29 including a vacuum bulb 43 having a pair of contact points 41 and 42 that can be contacted and separated. By using the vacuum bulb 43 for the discharge switch 29, a small and large capacity switch that does not emit an arc to the outside can be obtained.

  A fixed-side capacitor terminal conductor 44 connected to one terminal of the capacitor 24 is connected to the fixed side below the vacuum valve 43 in the drawing. The fixed-side capacitor terminal conductor 44 is fixed to a plate-like first base plate 46 fixed to a fixing member of the switchgear device via an insulating plate 45.

  A movable capacitor terminal conductor 47 connected to the other terminal of the capacitor 24 is connected to the movable side above the vacuum valve 43 in the drawing. A fourth movable shaft 48 is connected to the movable-side capacitor terminal conductor 47 in the axial direction, and one end of an insulating operation rod 49 is fixed to the end of the fourth movable shaft 48. A fifth movable shaft 50 is fixed in the axial direction at the other end of the insulating operation rod 49, and a wipe spring 51 that applies a contact load around the fifth movable shaft 50 when the pair of contacts 41 and 42 are in contact with each other. Is provided.

  The fourth movable shaft 48 penetrates through a through hole 52a provided on one side surface of the L-shaped second base plate 52 fixed to the fixing member of the opening / closing device. . An insulating rod 53 is provided between one side surface of the second base plate 52 and the first base plate 46 and is fixed by a nut 54.

  The link mechanism 40 b is provided with a plate-like main lever 56 having one end rotatably fixed by a fixing pin 55 on the other side surface of the second base plate 52. A movable pin 57 is fixed to an intermediate portion of the main lever 56, and a third block 58 is fixed to the movable pin 57. The fifth movable shaft 50 penetrates through the third block 58 so as to be slidable in the axial direction, and the spring force of the wipe spring 51 can be adjusted.

  One end of a first interlock rod 59 is rotatably connected to the other end of the main lever 56 by a movable pin 60. At the other end of the first interlock rod 59, a roller 61 that travels on the first block 31 is fixed by a movable pin 62.

  Further, one end of the first spring 63 of the elastic member is fixed by a movable pin 64 between the movable pin 57 and the movable pin 60 in the middle part of the main lever 56. The other end of the first spring 63 is fixed to the insulating rod 53 with a fixing pin 65, and a tensile force that moves the main lever 56 downward in the figure is applied. The main lever 56 is further prevented from moving downward in the figure by a fixing pin 66 fixed to the second base plate 52.

  Further, one end of a link lever 67 is fixed to the movable pin 64 so as to be rotatable. An intermediate portion of the link lever 67 is rotatably fixed by a fixing pin 68 fixed to the second base plate 52. One end of a second interlock rod 69 disposed substantially parallel to the first interlock rod 59 is connected to the other end of the link lever 67 by a movable pin 70. The side surface of the other end comes into contact with the second block 32 when the opening / closing device is in the disconnecting position.

  The main lever 56 is fixed with a movable pin 72 that is locked to the end of the plate-like catch 71. The catch 71 is rotatably fixed by a fixing pin 73 whose intermediate portion is fixed to the second base plate 52. A second spring 74 is wound around the fixing pin 73, and has a counterclockwise spring force to return the catch 71 when the catch 71 rotates clockwise. In the state where the second spring 74 is provided, the side surface of the catch 71 and the movable pin 72 are in contact with each other.

  A U-shaped support plate 75 is fixed to the second base plate 52 on the side of the first interlock rod 59 facing the catch 71. The support plate 75 is in contact with the side surface of the catch 71 to rotate the catch 71 counterclockwise, and the push button shaft 76 is moved to the left in the drawing, that is, in a direction away from the catch 71. A biased third spring 77 is provided.

  In FIG. 2, the discharge device 30 is in the disconnect position, and the discharge switch 29 is in a closed state.

  Next, the operation of the discharge device 30 when the switchgear is set to the connection position will be described with reference to FIGS.

  As shown in FIG. 3, when the opening / closing device is located at the connection position, the roller 61 is on the first block 31, the first interlock rod 59 is pushed upward in the figure, and the main lever 56 is a fixed pin. It is rotated clockwise with 55 as a fulcrum, and the state is maintained. Further, the movable pin 57 is also pushed upward in the figure, and the insulating operation rod 49, the fourth movable shaft 48 and the contact 41 connected to the movable pin 57 are similarly pushed upward in the figure and a pair of contacts 41, 42 are also shown. The gap is open. In addition, the open state is maintained by the locking means in which the movable pin 72 is locked to the end of the catch 71. Thus, the capacitor 24 can be charged.

  In such an open state, as shown in FIG. 4, when the push button shaft 76 is pushed rightward in the figure, the end of the push button shaft 76 comes into contact with the side surface of the catch 71, and the catch 71 uses the fixing pin 73 as a fulcrum. It rotates counterclockwise. Then, the movable pin 72 locked to the end portion of the catch 71 is released, and the main lever 56 tries to rotate counterclockwise. However, the first interlock rod 59 is on the first block 31 and does not move downward in the figure, and the rotation of the main lever 56 is prevented.

  For this reason, the pair of contacts 41 and 42 connected to the movable pin 57 maintains the open state. That is, when the opening / closing device is in the connection position, the interlock device restricts the operation of the discharge switch 29 so as not to be closed. Thus, maintaining the discharge switch 29 in the open state when the switchgear is in the connected position is defined as the open-circuit holding means.

  Next, the operation of the discharge device 30 when the switchgear is pulled out to the disconnect position will be described with reference to FIG.

  As shown in FIG. 5, the roller 61 of the first interlock rod 59 is disengaged from the first block 31 when the opening / closing device is brought into the disconnecting position from the state of FIG. 4. The end of the second interlock rod 69 comes into contact with the second block 32, and the switchgear can be moved to the disconnect position, but cannot be pulled out any more. That is, in the state where the discharge switch 29 is open, there is a possibility that electric charge remains in the capacitor 24, and the interlock device restricts the movement of the switchgear.

  Here, when the roller 61 is disengaged from the first block 31, the first interlock rod 59 is lowered downward in the figure, and the main lever 56 is rotated counterclockwise. At the same time, the link lever 67 rotates clockwise with the fixing pin 68 as a fulcrum, and the second interlock rod 69 moves upward in the drawing.

  Then, the main lever 56 rotates counterclockwise, and the pair of contacts 41 and 42 are closed as shown in FIG. When the contact is closed, a contact load is applied between the contacts 41 and 42 by the wipe spring 51, and the electric charge of the capacitor 24 can be reliably discharged. Further, the end of the second interlock rod 69 moves upward in the figure and comes off from the second block 32. Thereby, the switchgear can be pulled out of the electric device.

  Thus, if the discharge switch 29 is open when the switchgear is in the disconnect position, the end of the second interlock rod 69 contacts the second block 32 and prevents the switchgear from being pulled out. Enabling closing of the discharge switch 29 is defined as means capable of closing.

  Here, in general, the procedure for closing the discharge switch 29 is to pull out the discharge device 30 in the connection position as shown in FIG. 3 from the electric device to the disconnection position, and to connect the end of the second interlock rod 69 to the second position. This is brought into contact with the block 32. Then, as shown in FIG. 5, the push button shaft 76 is pushed to release the locking means for locking the movable pin 72 to the end of the catch 71, and the discharge switch 29 is closed as shown in FIG.

  Since the discharge switch 29 and the capacitor 24 are mounted on the same carriage 20, the length of the connection line connecting the discharge switch 29 and the capacitor 24 can be shortened compared to the case where the discharge switch 29 and the capacitor 24 are separately provided, and the connection reliability is improved. Thus, the electric charge of the capacitor 24 can be reliably discharged.

  According to the switchgear of the first embodiment, when the switchgear is set to the disconnecting position, the end of the second interlock rod 69 abuts against the second block 32 so that the switchgear cannot be taken out of the electric device. At the same time, when the discharge button 29 is closed by pressing the push button shaft 76, the end of the second interlock rod 69 is disengaged from the second block 32. Electric charges can be reliably discharged, and maintenance and inspection work can be facilitated.

  Next, a switchgear according to Embodiment 2 of the present invention will be described with reference to FIG. FIG. 6 is a cross-sectional view illustrating a configuration of a discharge device according to Embodiment 2 of the present invention. The second embodiment is different from the first embodiment in that a display for displaying the state of the discharge switch is provided. In FIG. 6, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 6, the first interlock rod 59 is provided with a display device 80 that fixes the open state or the closed state of the discharge switch 29 with bolts 81. That is, the indicator 80 is visible from the outside of the switchgear and moves upward in the figure when the discharge switch 29 is in the open state, and moves downward in the figure when in the closed state.

  The indicator 80 may be provided on the second interlock rod 69. In this case, the indicator 80 moves downward in the figure when the discharge switch 29 is in the open state, and moves upward in the figure when the discharge switch 29 is in the closed state. Moving.

  According to the switchgear of the second embodiment, in addition to the effects of the first embodiment, the open state or the closed state of the discharge switch 29 can be confirmed from the outside of the discharge device 30 to further perform maintenance and inspection work. Can be easily.

The figure explaining the structure of the switchgear concerning Example 1 of the present invention. Sectional drawing which shows the structure of the discharge device which concerns on Example 1 of this invention. Sectional drawing explaining operation | movement of the discharge device in the connection position which concerns on Example 1 of this invention. Sectional drawing explaining the interlock operation | movement of the discharge device in the connection position which concerns on Example 1 of this invention. The figure explaining operation | movement of the discharge device in the disconnection position which concerns on Example 1 of this invention. Sectional drawing which shows the structure of the discharge device which concerns on Example 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a Main circuit part 1b Power supply part 2a Blocking part 2b Wipe spring part 2c Operation mechanism part 3, 4, 41, 42 Contact 5, 43 Vacuum valve 6 Fixed side conductor 7 Movable side conductor 8 Slide contact 9 Main circuit terminal 10 1st Movable shafts 11, 49 Insulating operation rod 12 Second movable shafts 13, 51 Wipe spring 14 Wipe spring folder 15 Third movable shaft 16 Operation mechanism 17 Insulation coating 18 Electromagnetic repulsion coil 19 Repulsion ring 20 Bogie 21 Wheel 22 Floor plate 23 Frame 24 Capacitor 25 Thyristor switch 26 Charge switch 27 DC power supply 28 Discharge resistor 29 Discharge switch 30 Discharge device 31 First block 32 Second block 40a Discharge switch section 40b Link mechanism section 44 Fixed-side capacitor terminal conductor 45 Insulating plate 46 First Base plate 47 Movable capacitor terminal conductor 48 Fourth movable 50 Fifth movable shaft 52 Second base plate 52a Through hole 53 Insulating rod 54 Nut 55, 65, 66, 68, 73 Fixed pin 56 Main lever 57, 60, 62, 64, 70, 72 Movable pin 58 Third Block 59 first interlock rod 61 roller 63 first spring 67 link lever 69 second interlock rod 71 catch 74 second spring 75 support plate 76 push button shaft 77 third spring 80 indicator 81 bolt

Claims (6)

A pair of detachable contacts;
An electromagnetic repulsion mechanism that opens the pair of contacts with an electromagnetic repulsion force;
An operation mechanism for opening and closing the pair of contacts;
A capacitor for driving the electromagnetic repulsion mechanism;
A discharge switch connected between terminals of the capacitor;
Opening holding means for keeping the discharge switch in an open state;
A closing capable means for enabling the discharge switch to be in a closed state ;
The opening / closing device , wherein the discharge switch is a vacuum bulb having a pair of contacts that can be contacted and separated . The switchgear according to claim 1, wherein the discharge switch and the capacitor are mounted on the same carriage . An operation mechanism having an electromagnetic repulsion mechanism mounted on a carriage moving on the floor board;
A capacitor for driving the electromagnetic repulsion mechanism;
A discharge switch connected between terminals of the capacitor;
A first interlock rod having one end connected to the discharge switch;
The other end of the first interlock rod is movably provided, and includes a first block fixed to the floor plate,
An interlock device for a switchgear, wherein the discharge switch is held open when the other end of the first interlock rod is positioned on the first block. An operation mechanism having an electromagnetic repulsion mechanism mounted on a carriage moving on the floor board;
A capacitor for driving the electromagnetic repulsion mechanism;
A discharge switch connected between terminals of the capacitor;
A second interlock rod having one end connected to the discharge switch ;
A second block fixed to the floor plate so that the other end of the second interlock rod abuts,
An interlock device for a switchgear , wherein the discharge switch can be closed when the other end of the second interlock rod comes into contact with the second block . When the second interlock rod comes into contact with the second block, the locking means for locking the main lever connected to the second interlock rod is released, and the discharge switch is closed. The opening / closing device interlock device according to claim 4, wherein The display device for displaying an open / close pole state of the discharge switch is provided on at least one of the first interlock rod and the second interlock rod. The interlock device of the switchgear according to item 1 .

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