JP2009289485A - Remote controlled breaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a remote controlled breaker allowing the off state of a main contact to be discriminated without looking at it directly. <P>SOLUTION: The remote controlled breaker includes the main contact turned off at the occurrence of an abnormal current and turned on/off by manual operation, and a relay contact series-connected to the main contact in a feeder line from a power source to a load and turned on/off by a control signal from the outside. The remote controlled breaker further includes: a main contact state-detecting switch 71 whose contact state is switched interlocked with the on/off of the main contact; a relay contact state detecting switch 72 whose contact state is switched interlocked with the on/off of the relay contact; and an abnormality signal-generating circuit for outputting a predetermined abnormality signal when the main contact is turned off and the relay contact is turned on, that is, when terminals 73a, 73b are connected, based on the contact state of the main contact state detecting switch 71 and the contact state of the relay contact state detecting switch 72. The off state of the main contact can be discriminated by the abnormality signal. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a remote control breaker.

  2. Description of the Related Art Conventionally, there has been provided a remote control breaker having a main contact that is turned off by manual operation and turned on and off by a manual operation and a relay contact that is turned on and off by an external control signal (for example, a patent) Reference 1).

In this type of remote control breaker, the main contact and the relay contact are inserted in a power supply path from the power source to the load as a series circuit. That is, if either one of the main contact and the relay contact is in an off state, power supply from the power source to the load is cut off.
JP 2006-92976 A

  In the remote control breaker as described above, power supply to the load is not started even when the relay contact is on during the period when the main contact is off. For this reason, if the load does not operate despite the operation of an external switch that switches the relay contact from the OFF state to the ON state, etc., whether the load is faulty or the main contact is in the OFF state, There has been a problem that it cannot be determined whether or not the contact drive mechanism has failed.

  The present invention has been made in view of the above-described reasons, and an object thereof is to provide a remote control breaker that can determine the off state of a main contact without directly looking.

  The invention of claim 1 includes a main contact inserted into a power supply path from the power source to the load, a relay contact inserted into the power supply path from the power source to the load as a series circuit of the main contact, and an abnormal current at the main contact. An abnormal current detecting means for driving the main contact off when flowing, an operating means for accepting a manual operation for turning on and off the main contact, a relay driving means for driving the relay contact on and off according to a control signal input from the outside, An abnormality signal generating means for outputting an abnormality signal when the main contact is turned off and the relay contact is turned on is provided.

  According to the present invention, it is possible to determine the OFF state of the main contact without looking directly by the abnormal signal output from the abnormal signal generating means.

  According to a second aspect of the present invention, in the first aspect of the invention, the abnormality signal output means includes a main contact state detection switch that switches a contact state in conjunction with on / off of the main contact, and a contact state in conjunction with on / off of the relay contact. The relay contact state detection switch, the contact state of the main contact state detection switch, and the contact state of the relay contact state detection switch, it is detected that the main contact is off and the relay contact is on. And an abnormal signal generation circuit for outputting an abnormal signal.

  According to the present invention, it is possible to determine the OFF state of the main contact without looking directly by the abnormal signal output from the abnormal signal generating means.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  In this embodiment, as shown in FIGS. 2 to 5, a main contact device 1 having a main contact 10 inserted into a power supply path from a power source (not shown) to a load (not shown), and the main contact 10. As a series circuit, a relay device 2 having a relay contact 20 inserted in a power supply path from a power supply to a load, and a main body 3 storing the main contact device 1 and the relay device 2 are provided. Hereinafter, the top, bottom, left, and right are based on FIG. 2A, and the front side of the paper in FIG. 2A (the back side of the paper in FIG. 2B) is referred to as the front side.

  The main body 3 includes a case 31 in which a concave portion in which the main contact device 1 and the relay device 2 are accommodated is opened on the front surface, and is mechanically coupled to the front side of the case 31 to accommodate the main contact device 1 and the relay device 2. And a cover (not shown) that forms a space between the case 31 and the case 31. Each of the case 31 and the cover is made of, for example, a synthetic resin molded product.

  A connecting groove 3a that is open in the front-rear direction is provided on the right end surface of the vessel body 3, and a power supply side terminal 4 that is connected to a power source is held in the connecting groove 3a. The power supply side terminal 4 is made of a metal leaf spring that is connected to a main breaker (not shown) and elastically holds a conductive bar (not shown) inserted into the connection groove 3a from above and below.

  In addition, a load-side terminal 5 to which the other end of an electric wire (not shown) whose one end is connected to a load is held at the left end portion of the vessel body 3. The load-side terminal 5 is made of a metal plate and is made up of a terminal plate 51 that is in contact with an electric wire inserted through an electric wire insertion hole 3b opened on the left end surface of the vessel body 3, and a metal leaf spring. It is a well-known so-called quick-connection terminal having a locking spring 52 that bites and locks (locks) and presses the electric wire against the terminal plate 51. Further, the load side terminal 5 is supported so as to be able to rotate left and right with respect to the container body 3 as viewed from the front, and the upper end portion is exposed from a release hole 3c provided in the upper surface of the container body 3, and the lower end portion is a lock spring A release lever 53 facing the upper surface of 52 is provided. When the electric wire connected to the load side terminal 5 is pulled out, if the release lever 53 is operated and rotated counterclockwise, the lower end of the release lever 53 presses the lock spring 52 from above to elastically deform it. As a result, the lock is released and the electric wire can be pulled out.

  The main contact device 1 holds the movable contact 11 and a movable contact 11 made of a metal plate in which the movable contact 10b of the fixed contact 10a and the movable contact 10b constituting the main contact 10 is provided on the lower surface of the left end portion. The movable frame 12 is rotatably supported in a plane viewed from the front with respect to the case 31, and the compression coil spring is elastically in contact with the right side of the lower end portion of the movable frame 12 and the leftward inner surface of the body 3. An opening spring 13a that urges the movable frame 12 clockwise (that is, a direction in which the movable contact 10b is pulled away from the fixed contact 10a), and the upper end of the body 3 can rotate in a plane viewed from the front with respect to the body 3 A handle 14 supported on the front side, a link 15 that links the movable frame 12 and the handle 14 to each other so as to be rotatable in a plane viewed from the front, and a movable frame. 12 On the other hand, when the main contact 10 is closed (that is, when the movable contact 10b is in contact with the fixed contact 10a), the lever 16 is rotatably connected so as to displace the right end portion up and down to some extent. The tripping member 17 that prohibits the clockwise rotation of the movable frame 12 and the lever 16 by contacting the lower surface of the right end portion of the motor, and the main contact 10 is turned off by detecting the abnormal current and driving the tripping member 17 And an abnormal current detector 18 to be driven. The handle 14 has an upper end protruding from an operation hole 3 d provided on the upper surface of the container 3. The abnormal current detection unit 18 is electrically connected to the right end portion of the movable contactor 11 via the first electric wire 61 and electrically connected to the power supply side terminal 4 via the second electric wire 62. Has been. That is, the abnormal current detection unit 18 is interposed in the electric circuit between the power supply side terminal 4 and the main contact 10.

  The handle 14 is an operating means in the claims, and the main contact device 1 turns on and off the main contact 10 in accordance with the operation of the handle 14. First, the operation of the main contact device 1 by the operation of the handle 14 will be described. As shown in FIGS. 4A and 4B and FIGS. 5A and 5B, when the handle 14 is tilted to the right, the main contact 10 is turned on when the movable contact 10b is brought into contact with the fixed contact 10a from above. It becomes a state. The movable frame 12 has a contact pressure spring 13b made of a compression coil spring that elastically contacts the lower surface of the right end portion of the movable contact 11 and urges the movable contact 11 to rotate clockwise relative to the movable frame 12. When the main contact 10 is on, the contact pressure of the movable contact 10b to the fixed contact 10a is secured by the spring force of the contact pressure spring 13b. When the main contact 10 is in the ON state as described above, the opening spring 13a is in a compressed state, but the right end of the lever 16 is locked to the upper end of the tripping member 17, thereby The clockwise rotation of the movable frame 12 with respect to the body 3 is prohibited. Further, since the rotation axis of the link 15 with respect to the handle 14 is located on the left side of the rotation axis of the link 15 with respect to the movable frame 12, the spring force of the opening spring 13a acts in the direction of rotating the handle 14 clockwise, Further, the handle 14 is prohibited from rotating clockwise with respect to the body 3 by contacting the inner surface of the operation hole 3d. As described above, the main contact 10a is maintained in the ON state regardless of the spring force of the opening spring 13a.

  When the handle 14 is rotated counterclockwise against the spring force of the opening spring 13a when the main contact 10 is in the ON state, the rotation axis of the link 15 with respect to the handle 14 becomes the rotation axis of the link 15 with respect to the movable frame 12. When the left side reaches the left side, the direction in which the spring force of the opening spring 13a acts on the handle 14 is reversed, whereby the spring force of the opening spring 13a is released and the handle 14 rotates counterclockwise. At the same time, the movable frame 12 rotates clockwise, and the movable contactor 11 rotates clockwise in conjunction with the movable frame 12, so that the main contact 10 is connected to FIGS. 2 (a), 2 (b) and 3 (a). As shown in (b), the movable contact 10b shifts to an off state separated from the fixed contact 10a. In order to return the main contact device 1 from the off state to the on state, the handle 14 may be rotated clockwise against the spring force of the opening spring 13a.

  Next, the operation of the main contact device 1 by the abnormal current detector 18 will be described. When an abnormal current flows through the main contact 10, the abnormal current detector 18 drives the tripping member 17 to rotate clockwise, thereby pulling the tripping member 17 away from the lever 16. Then, due to the spring force of the opening spring 13a, the movable frame 12 and the movable contact 11 rotate clockwise with respect to the container body 3, whereby the movable contact 10b is separated from the fixed contact 10a and the main contact 10 is moved. It is turned off (forced opening). Here, the handle 14 is connected to a return spring 13c made of a torsion coil spring, for example, which elastically contacts the lever 16 to generate a return force that brings the handle 14 into an upright posture, and the main contact is as described above. In the state immediately after the forcible opening, the handle 14 takes an upright posture with the tip facing upward without falling down to the left or right by the spring force of the return spring 13c. In order to return the main contact 10 from the state where the main contact 10 is forcibly opened as described above to the ON state, after the position of the tripping member 17 returns, the handle 14 is once tilted to the left (that is, rotated counterclockwise). ) Then, the lever 16 is again locked by the tripping member 17, and the main contact device 1 is turned off by the operation of the handle 14. Thereafter, when the handle 14 is tilted to the right (that is, rotated clockwise), the main contact device 1 returns to the ON state.

  Here, the abnormal current detection unit 18 may use a bimetal deformed by Joule heat generated by an overload current as an abnormal current, or a magnetic force or Lorentz force that generates a short-circuit current as an abnormal current. May be used, or a combination of these may be used. Since the abnormal current detection unit 18 as described above can be realized by a well-known technique, detailed description and illustration are omitted.

  Next, the relay device 2 will be described. The relay device 2 includes a movable contact made of a metal plate, of the fixed contact 20a and the movable contact 20b constituting the relay contact 20, the movable contact 20b being provided on the right surface of the upper end (the left surface in FIG. 2B). 21, a movable frame 21 that holds the movable contact 21 and is rotatably supported in a plane viewed from the front with respect to the body 3, and a left end (right end in FIG. 2 (b)) are movable. An electromagnetic device 23 having a slider 23a connected to the lower end of the frame 22 and driving the slider 23a to slide left and right relative to the body 3 to rotate the movable frame 22 and turn the relay contact 20 on and off; A control terminal 24 composed of a screw terminal to which a signal line (not shown) for transmitting a control signal for controlling the relay device 2 is connected, and is electrically connected to the control terminal 24 and inputted from the control terminal 24 According to control signal And a driving device 25 for driving the magnet system 23. That is, as shown in FIGS. 3A and 3B and FIGS. 5A and 5B, when the slider 23a is slid leftward (rightward in FIG. 3B), the movable contact 20b is fixed contact. The relay contact 20 is turned on in contact with 20a. Further, when the slider 23a slides to the right (leftward in FIG. 3B) from the relay contact 20 in the ON state, the movable contact 21 and the movable frame 22 are rotated counterclockwise (in FIG. 3B). 2), the movable contact 20b is displaced leftward (rightward in FIG. 2B) as shown in FIGS. 2A, 2B and 4A, 4B. As a result, the relay contact 20 is turned off from the fixed contact 20a. That is, the electromagnet device 23 and the drive device 25 constitute the relay drive means in the claims. Since the electromagnet device 23 and the driving device 25 as described above can be realized by a well-known technique, detailed description and illustration are omitted.

  Further, the relay device 2 is rotatably supported in a plane viewed from the front with respect to the container body 3 and is connected to the upper end portion of the movable frame 22 so as to rotate in conjunction with the movable frame 22. 26, and a display hole 3 e for exposing the display body 2 is provided at the upper end of the container body 3. In the display body 26, when the relay contact 20 is in an on state, a display indicating that the relay contact 20 is in an on state is attached to a surface exposed from the display hole 3e, and when the relay contact 20 is in an off state. A display indicating that the relay contact 20 is in an off state is attached to the surface exposed from the display hole 3e. That is, the contact state of the relay contact 20 is displayed on the display body 26.

  Here, the movable contact 21 of the relay device 2 is electrically connected to the terminal plate 51 of the load side terminal 5 via the third electric wire 64 made of a knitted wire. Furthermore, a metal conductive plate 63 is held inside the vessel 3, the fixed contact 10 a of the main contact 10 is provided on the upward surface of the conductive plate 63, and the fixed contact 20 a of the relay contact 20 is the conductive plate. 63 is provided on the surface facing left (facing right in FIG. 2B). That is, the main contact 10 and the relay contact 20 are electrically connected via the conductive plate 63, and between the power source connected to the power source side terminal 4 and the load connected to the load side terminal 5. In this case, a series circuit of the main contact 10 and the relay contact 20 is interposed.

  The present embodiment also includes a main contact state detection switch 71 for detecting the contact state of the main contact 10, a relay contact state detection switch 72 for detecting the contact state of the relay contact 20, and a main contact state detection switch. Based on the contact state of 71 and the contact state of the relay contact state detection switch 72, the relay contact 20 is turned on and the main contact 10 is turned off (hereinafter referred to as "abnormal state"). An abnormal signal generation circuit (not shown) that outputs a predetermined electric signal (hereinafter referred to as “abnormal signal”) for notifying the external of the abnormal state when the abnormal state is detected is provided. While the main contact state detection switch 71 and the relay contact state detection switch 72 are housed in the body 3, the abnormal signal generation circuit is disposed outside the body 3, and the left end of the body 3 (FIG. 2 (b) In order to insert a wire (not shown) that electrically connects the main contact state detection switch 71 and the relay contact state detection switch 72 and the abnormal signal generation circuit to the lower side of the control terminal 24 at the right end in FIG. The electric wire insertion hole 3f is provided.

  More specifically, the main contact state detection switch 71 and the relay contact state detection switch 72 have push buttons 71a and 72a, respectively, and the push buttons 71a and 72a are directed leftward (to the right in FIG. 2B). Is held in the body 3. The contact configuration of the main contact state detection switch 71 and the contact configuration of the relay contact state detection switch 72 are switching contacts (c contacts) as shown in FIGS. The detection switch 71 and the relay contact state detection switch 72 each have a common terminal COM, a normally closed terminal NC, and a normally open terminal NO. That is, in each of the main contact state detection switch 71 and the relay contact state detection switch 72, the common terminal COM is insulated from the normally open terminal NO and normally closed during a period when the push buttons 71a and 72a are not receiving the pressing force. It is electrically connected to the terminal NC, and is insulated from the normally closed terminal NC and electrically connected to the normally open terminal NO during a period in which the push buttons 71a and 72a are receiving a pressing force.

  Further, the main contact device 1 has a slider 19 that is slidably held with respect to the container body 3. The slider 19 is urged upward with respect to the body 3 by a return spring 13d made of a compression coil spring. When the main contact 10 is in an on state, the slider 19 resists the spring force of the return spring 13d. By being pressed downward by the portion (left end portion in FIG. 2B), the main contact 10 is positioned lower than when it is in the off state. Further, on the right end surface (left end surface in FIG. 2B) directed toward the main contact state detection switch 71 in the slider 19, it is inclined upward (to the left in FIG. 2B) upward. When the main contact 10 switches from the OFF state to the ON state, the push button 71a of the main contact state detection switch 71 is pushed by the inclined portion 19a as the slider 19 slides downward. Operated. That is, in the main contact state detection switch 71, the common terminal COM is connected to the normally closed terminal NC when the main contact 10 is in the off state, and the common terminal COM is normally open during the period when the main contact 10 is in the on state. The contact state is switched in conjunction with the contact state of the main contact 10 such as being connected to the terminal NO.

  The push button 72a of the relay contact state detection switch 72 is pushed by the left end surface of the slider 23a that slides to the right (left side in FIG. 2B) when the relay contact 20 is turned off. That is, in the relay contact state detection switch 72, the common terminal COM is connected to the normally closed terminal NC while the relay contact 20 is on, and the common terminal COM is normally open when the relay contact 20 is off. The contact state is switched in conjunction with the contact state of the relay contact 20 such as being connected to the terminal NO.

  Further, the normally closed terminal NC of the main contact state detection switch 71 and the common terminal COM of the relay contact state detection switch 72 are electrically connected via a wire (not shown), and the abnormal signal generation circuit detects the main contact state detection. A first terminal 73 a electrically connected to the common terminal COM of the switch 71, a second terminal 73 b electrically connected to the normally closed terminal NC of the relay contact 20, and a normal of the main contact state detection switch 71 And a third terminal 73c electrically connected to the open terminal NO and the normally open terminal NO of the relay contact state detection switch 72. Then, the abnormal signal generation circuit, when the first terminal 73a and the second terminal 73b are electrically connected as shown in FIG. 1B, that is, the main contact 10 is turned off and the relay contact 20 is turned on. An abnormal signal is output when the state becomes (that is, an abnormal state). Since such an abnormal signal generation circuit can be realized by a well-known technique, detailed description and illustration are omitted. The abnormal signal output from the abnormal signal generation circuit can be used as a trigger for starting an operation of notifying an abnormal state (for example, lighting of a light emitting diode) in an external display device (not shown), for example.

  According to the above configuration, it is possible to determine the off state of the main contact 10 without directly viewing the posture of the handle 14 or the like based on the abnormality signal output from the abnormality signal generation circuit.

(A)-(d) is explanatory drawing which shows operation | movement of embodiment of this invention, respectively, (a) shows the state in which a main contact is OFF and a relay contact is OFF, (b) is a state where a main contact is OFF and The relay contact is on, (c) is the main contact is on and the relay contact is off, and (d) is the main contact is on and the relay contact is on. (A) (b) shows the state in which the main contact is off and the relay contact is off, respectively, (a) is a front view showing a state where the cover of the housing is removed, and (b) is a rear view seen through the housing. It is. (A) (b) shows the state in which the main contact is off and the relay contact is on in the same as above, (a) is a front view showing a state where the cover of the housing is removed, and (b) is a rear view seen through the housing. It is. (A) (b) shows the state in which the main contact is on and the relay contact is off in the same as above, (a) is a front view showing a state where the cover of the housing is removed, and (b) is a rear view seen through the housing. It is. (A) (b) shows the state in which the main contact is on and the relay contact is on in the same as above, (a) is a front view showing a state where the cover of the housing is removed, and (b) is a rear view seen through the housing. It is.

Explanation of symbols

10 Main contact 14 Handle (operating means in claims)
18 Abnormal current detection unit 20 Relay contact 23 Electromagnet device (relay driving means in claims)
25 Driving device (relay driving means in claims)
71 Main contact state detection switch 72 Relay contact state detection switch

Claims (2)

  A main contact inserted into the power supply path from the power source to the load, a relay contact inserted into the power supply path from the power source to the load as a series circuit with the main contact, and a main contact when an abnormal current flows through the main contact An abnormal current detecting means for driving off, an operating means for accepting a manual operation for turning on / off the main contact, a relay driving means for driving on / off of the relay contact in accordance with a control signal inputted from the outside, and the main contact being off and the relay contact A remote control breaker, comprising: an abnormal signal generating means for outputting an abnormal signal when is turned on.   The error signal output means includes a main contact state detection switch that switches the contact state in conjunction with the on / off of the main contact, a relay contact state detection switch that switches the contact state in conjunction with the on / off of the relay contact, and a main contact state detection An abnormality signal generation circuit that outputs an abnormality signal when it is detected that the main contact is off and the relay contact is on based on the contact state of the switch and the contact state of the relay contact state detection switch. The remote control breaker according to claim 1.

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