JP2006031975A - Opening and closing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an opening and closing device which can open/close a contact by a phase control for either of a hand operation with a device body even at a remote operation time from the position separated from the device body. <P>SOLUTION: As an operation unit which outputs an operation signal S1 to a signal processor 9, the opening and closing device is provided with a remote operation unit 6a provided separately from a device body 12, and a hand operation unit 6b provided in the device body 12. A signal terminal T which inputs the operation signal S1 from the remote operation unit 6a is provided in the device body 12. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a phase control type switching device that opens and closes a contact portion at a predetermined voltage phase by phase control.

2. Description of the Related Art Conventionally, a remote control switchgear that is called a remote control relay is provided as an internal unit of a distribution board (for example, Patent Document 1).
In this conventional example, in order to cope with a system trouble on the sending side of a control signal instructing an opening / closing operation, an interlocking lever interlocking with the opening / closing operation of the electromagnetic opening / closing mechanism portion is provided, and the tip end portion is opened from the window hole of the apparatus body. Facing the outside of the device body, the tip of a jig such as a screwdriver is inserted into the operation groove formed on the surface of the tip, and the interlocking lever can be manually operated from the outside of the device body by the jig. .

  In addition, a display portion that can be seen from the window hole is provided at the tip of the interlocking lever by utilizing the fact that the interlocking lever rotates in conjunction with the opening / closing operation of the electromagnetic opening / closing mechanism. ", And when the contact portion is closed," OFF "is positioned in the window hole so that the state of the contact portion can be seen from the outside.

  On the other hand, in the switchgear, as a method for preventing the welding of the contact part due to the inrush current, the contact part near the zero cross is detected by detecting the voltage phase or current phase of the AC power source connected to the load via the contact part. There is one that employs a phase control method for opening / closing (for example, Patent Document 2).

This conventional example is provided with a phase detection circuit for detecting the voltage phase of the AC power supply, for example, when phase control is performed by voltage phase, and the phase detection signal is sent to the signal processing circuit. The signal processing circuit inputs the phase detection signal. The electromagnetic switching mechanism is operated after a certain delay time so that the contact is opened / closed near the zero cross.
JP-A-7-182960 (paragraph number 0027) Japanese Patent Laid-Open No. 61-51720 (FIG. 1 of the accompanying drawings)

  By the way, when the phase control method as shown in Patent Document 2 is used as a control method of a switchgear having a structure as shown in Patent Document, the contact portion can be opened and closed by the phase control method in remote control. During manual operation with an interlocking lever linked to the opening and closing mechanism, the voltage phase for opening or closing the contact is determined at the timing of manual operation, so opening or closing near the zero cross cannot be performed, Therefore, there is a high possibility that a large inrush current flows in the load and contacts are welded at the time of closing in manual operation, or that there is a high possibility that arc discharge occurs at the time of opening and the contacts are welded.

  The present invention has been made in view of the above-mentioned problems, and the object of the present invention is to perform contact control by phase control during remote operation from a position distant from the apparatus main body or by hand operation on the apparatus main body. It is an object of the present invention to provide an opening / closing device capable of opening / closing the device.

  In order to achieve the above-described object, in the invention of claim 1, an electromagnetic switching mechanism for opening and closing a contact portion inserted between a load and an AC power supply, and specification of the AC power supply voltage applied to the load When there is an input of an operation signal from the operation unit, an operation unit that outputs an operation signal that instructs the opening / closing operation, and an input of an operation signal from the operation unit, the phase detection signal output from the phase detection circuit after this input A signal processing circuit that outputs an open / close signal after a certain delay time based on timing; and a drive circuit that drives the electromagnetic switching mechanism by the open / close signal to open / close the contact portion. In the switchgear in which the delay time is set so that the contact portion opens / closes at a predetermined phase of the AC power supply voltage, the remote control unit provided separately from the device main body as the operation unit, and the device Provided on the body Characterized in that it comprises a device main body signal terminal unit for inputting an operation signal from the remote control unit provided with a the original operation unit.

  According to the first aspect of the present invention, when the operation signal input to the operation terminal unit provided in the apparatus main body is not input due to a system trouble or the like, or when it is desired to open / close by hand, the operation signal is transmitted from the hand operation unit. The contact portion can be opened / closed by phase control by applying it to the processing circuit, so that the inrush current at the closing can be reduced and the arc discharge at the opening can be reduced, so that the welding of the contact portion can be prevented.

  According to a second aspect of the present invention, in the first aspect of the invention, there is provided display means for displaying an open / closed bear of the contact portion in conjunction with the operation of the electromagnetic opening / closing mechanism portion, and a push button switch as the hand operating portion. The push button of the push button switch is exposed at a position in the vicinity of the position of the apparatus main body with the display portion of the display means facing outside.

  According to the invention of claim 2, since the operation of the hand operation unit is a push operation of the push button switch, the operation load can be made very small compared to the case where the electromagnetic opening / closing mechanism unit is operated manually, It can be operated while checking the display means.

  In the invention of claim 3, in the invention of claim 2, the interlocking mechanism between the display means and the electromagnetic opening / closing mechanism section drives the electromagnetic opening / closing mechanism section in the opening direction when the display means is in an on-display state. It has a manual interlocking function that enables it.

  According to the third invention, even if the contact portion is welded, the electromagnetic switching mechanism portion is forcibly driven to the opening side by using the manual interlocking function of the display means, and the contact welding can be eliminated.

  According to a fourth aspect of the present invention, in any one of the first to third aspects of the present invention, an auxiliary contact portion interlocked with the opening / closing operation of the contact portion is provided, and the signal processing circuit is in a state of the contact portion depending on the state of the auxiliary contact portion And determining the delay time corresponding to the closed state / open state.

  According to the fourth invention, the state of the current contact portion can be recognized by the signal processing circuit based on the state of the auxiliary contact portion interlocked with the contact portion, so that the next operation is either the closed state or the open state. The contact portion can be opened / closed with a delay time suitable for the operation and the opening / closing by stable phase control can be performed.

  The present invention provides an operation signal to the signal processing circuit from the hand operation unit when the operation signal input to the operation terminal unit provided in the apparatus main body is not input due to a system trouble or when it is desired to open and close by hand. The contact portion can be opened / closed by phase control, so that the inrush current at the closing can be reduced and the arc discharge at the opening can be reduced, and as a result, the welding of the contact portion can be prevented.

  Embodiments of the present invention will be described below.

(Embodiment 1)
As shown in FIG. 1, the switchgear 1 of the present embodiment is provided in a phase detection circuit 5 that detects a predetermined phase of a voltage of an AC power supply 4 that is connected to a load 2 via a contact portion 3, and an external system. The remote operation unit 6a, the hand operation unit 6b provided in the apparatus, the electromagnetic switching mechanism unit 7 that opens and closes the contact unit 3, and the excitation coil 22 of the electromagnetic switching mechanism unit 7 is driven by passing an excitation current. A signal that outputs an opening / closing signal S3 to the drive circuit 8 based on the drive circuit 8, the operation signal S1 from the remote operation unit 6a or the hand operation unit 6b, and the phase detection signal S2 of the phase detection circuit 5. The processing circuit 9, the power supply unit 10 that supplies the operation power of the circuit in the apparatus main body 12, and the OR circuit 16 that takes the logical sum of the operation signals S 1 of both the operation units 6 a and 6 b and outputs the logical sum to the signal processing circuit 9. The signal processing circuit 9 is configured by the operation unit 6. Alternatively, when the operation signal S1 from 6b is inputted, the opening / closing signal S3 is outputted to the drive circuit 8 through a certain delay time based on the phase detection signal S2 inputted after this input, and the electromagnetic switching mechanism unit 7 is driven to open / close the contact portion 3.

  2A and 2B are cross-sectional views showing the structure of the switchgear 1 according to the present embodiment. The device body 12 of the switchgear 1 is a box whose side is opened by an insulating synthetic resin as shown. A body 12a formed in a shape and a cover 12b covering the opening surface of the body 12a. The body 12a and the cover 12b are respectively inserted with caulking pins 14 through assembly holes 13 formed in the body 12a and the cover 12b. The body 12a is integrally coupled by caulking the tip end portion of the caulking pin 14 that projects to the side surface opposite to the cover 12b.

  On one side (left side in the figure) of the apparatus main body 12, a circuit board 15 on which the circuit elements 5, 8, 9, 11 and the power supply unit 10 shown in FIG. 1 are mounted is arranged, and the other side (right side). Is provided with a contact portion 3 comprising a fixed terminal plate 16 provided with a fixed contact 3a and a movable contact 17 provided with a movable contact 3b, and a polarized electromagnetic switching mechanism portion 7 is fixedly arranged at the center. It is.

  The electromagnetic opening / closing mechanism section 7 includes two yokes 18 formed in a substantially U shape, and the yokes 18 are arranged so as to face each other with a gap 19 between the front end surfaces of the leg pieces. One magnetic pole of the permanent magnet 20 contacts the central piece of the yoke 18, and the auxiliary yoke 21 is coupled to the other magnetic pole of the permanent magnet 20. The yoke 18 is held by a coil frame 23 around which the excitation coil 22 is wound, and a plunger 24 is inserted inside the portion of the coil frame 23 where the excitation coil 22 is wound so as to be able to advance and retract in the axial direction of the excitation coil 22. The

  The plunger 24 is fixed with two armatures 25 that abut against the yoke 18 or the auxiliary yoke 21 at the time of advancement and retraction to restrict the movement range of the plunger 24 and form a magnetic circuit. The exciting coil 22 is a one-winding type, and the plunger 24 advances and retreats according to the energizing direction to the exciting coil 22, and the plunger 24 is held at the stop position by the magnetic force of the permanent magnet 20. That is, in the stop position, a closed magnetic path of the path of permanent magnet 20-auxiliary yoke 21-armature 25-plunger 24-armature 25-yoke 18-permanent magnet 20 is formed, and the plunger 24 is held in that position. is there. In the armature 25 on which the plunger 24 is protruded, a contact plate 26 made of a nonmagnetic material is fixed to the contact surface with the yoke 18, and the armature 25 is easily detached from the state in which the armature 25 is attracted to the yoke 18. I can do it.

  As shown in FIG. 2 (b), an interlocking lever 27 made of synthetic resin, which is an insulating material, is rotatably coupled to one end (right side) of the forward and backward direction of the war record plunger 24 by a shaft pin 28. The interlocking lever 27 is pivotally supported by two shaft pins 30 inserted through a pair of support pieces 29 protruding from the outer peripheral surface of the coil frame 23 of the electromagnetic switching mechanism portion 7. Each shaft pin 30 is inserted into the interlocking lever 27 through the support piece 29, and the both shaft pins 30 are arranged in a straight line. However, the length dimension is set so that the shaft pins 30 do not contact each other inside the interlocking lever 27. Is set. Inside the interlocking lever 27, a synthetic resin that is a constituent material of the interlocking lever 27 exists between the shaft pins 30, and the shaft pins 30 are insulated. The shaft pin 28 and the shaft pin 30 are parallel to each other, and when the plunger 24 reciprocates, the interlocking lever 27 swings around the shaft pin 30. As described above, the fulcrum of the interlocking lever 27 is constituted by the two shaft pins 30 and a part of the interlocking lever 27 is interposed between the tip ends of the both shaft pins 30 to insulate the shaft pins 30 from each other. It is.

  The interlocking lever 27 has a partition plate 27a, and contactor holding bases 27b project from the left and right side surfaces of the partitioning plate 27a, and surfaces opposite to the contactor holding bases 27b are provided on both side surfaces of the partitioning plate 27a. A spring receiving projection 27c formed in a substantially U-shape that opens is also provided. The spring receiving projection 27c holds one end of the contact pressure spring 31 made of a coil spring. The other end of the contact pressure spring 31 is brought into elastic contact with the movable contact 17 inserted between the contact holder holding base 27b and the spring receiving projection 27c.

  The movable contact 17 has a strip shape, and a movable contact 3b is fixed to one end in the longitudinal direction, and a terminal plate 33 is connected to the other end via a connection line 32 made of a braided copper wire. A terminal screw 34 with a washer is screwed onto the terminal plate 33. In addition, a protrusion (not shown) serving as a seat for the contact pressure spring 31 is formed in the intermediate portion in the longitudinal direction of the movable contact 17, and the positioning is provided on the interlocking lever 27 below the protrusion. A positioning hole (not shown) through which the protrusion 36 is inserted is provided. Further, the distal end portion of the positioning protrusion 36 is locked to the peripheral portion of the positioning hole.

  The interlocking lever 27 is provided with a fulcrum protrusion 37 on the side of the positioning protrusion 36, the surface of which is curved and with which the movable contact 17 comes into contact. The fulcrum protrusion 37 can contact the movable contact 17. It has become. A movable electromagnetic iron piece 38 is fixed to an end of the movable contact 17 below the movable contact 3b. At the upper end of the interlocking lever 27, a display piece 40 facing the display window hole 39 opened in the apparatus main body 12 is integrally provided, and characters “ON” and “OFF” are written on the display piece 40.

  The fixed contact 3a facing the movable contact 3b is formed by bending a conductive sheet metal, and is fixed to one end of a fixed terminal plate 16 fixed to the apparatus main body 12. The other end of the fixed terminal plate 16 is fixed to the apparatus main body. 12 is exposed to the outside. The fixed terminal plate 16 extends downward from one end portion where the fixed contact 3 a is provided along the movable contact 17, and the fixed electromagnetic iron piece 41 at the lower end portion of the extended portion so as to face the movable electromagnetic iron piece 38. Is fixed. A terminal screw 43 with a washer is screwed into the terminal piece 42 protruding outward from the apparatus main body 12.

  The movable contact 17 and the fixed terminal plate 16 are housed in the apparatus main body 12 two by two, and the contact portion 3 is constituted by two poles, and the load 2 is connected to the AC power source via the two pole contact portions 3. 4 is connected.

  A partition 44 is provided at a substantially central portion in the width direction of the apparatus main body 12 at a portion of the apparatus main body 12 in which the movable contact 17 and the fixed terminal plate 16 are accommodated. Two terminal bases (not shown) on which the one terminal plate 33 and the terminal piece 42 of the poles are respectively mounted are projected, and the surface of the partition wall 44 facing the cover 12b is projected on the two poles. Two terminal bases 45a and 45b project from the other terminal plate 33 and terminal piece 42, respectively.

  These terminal bases 45a, 45b... Are arranged in two upper and lower stages, and are arranged at different height positions from the terminal plate 33 connected to the movable contact 3b and the terminal piece 42 connected to the fixed contact 3a. It is made to do.

  Here, a pair of phase detection ends of the phase detection circuit 5 mounted on the circuit board 15 and a pair of power supply connection ends of the power supply unit 10 are fixed terminals constituting the power supply side terminals of each pole by two lead wires 46. When the AC power source 4 is electrically connected to the plate 16 and the AC power source 4 is connected to the terminal screws 43 and 43 of both poles, the power source unit 10 outputs DC for the internal circuit from the AC power source 4, and the phase detection circuit 5 is AC. A pulse signal having a width corresponding to a predetermined voltage phase of the power supply 4, that is, a certain voltage range centered on the zero cross point is output as the phase detection signal S 2.

  A pair of output ends of the drive circuit 8 on the circuit board 15 and both ends of the excitation coil 22 of the electromagnetic switching mechanism 7 are connected by two lead wires 49 so that an excitation current flows from the drive circuit 8 to the excitation coil 22. Can be done.

  Further, a pair of signal terminal boards 47 on the circuit board 15 are fixed to the circuit board 15, and terminal screws 48 with washers are screwed into the signal terminal boards 47, and these terminal screws 48 are used to remotely By connecting the signal line from the operation unit 6 a, the “H” level operation signal S 1 from the remote operation unit 6 a can be input to the OR circuit 11 through the signal terminal board 47. That is, the signal terminal portion T is constituted by the two sets of signal terminal plates 47 and the terminal screws 48.

  The remote operation unit 6a constitutes a controller of a system provided at a position away from the apparatus main body 12, and the operation signal S1 is output when the provided operation switch is turned on.

  Above the electromagnetic opening / closing mechanism section 7, a push button switch mechanism constituting the hand operating section 6b is arranged. The push button switch mechanism includes a fixed contact plate 50 having one end fixed to a circuit board 58 disposed on the inner side wall of the body 12a and a parallel arrangement on the upper side of the fixed contact plate 50 in FIG. A movable contact spring plate 53 fixed to the other end of the fixed contact plate 50 and a movable contact spring plate 53 facing the fixed contact 52 provided at the other end of the fixed contact plate 50 in a freely detachable manner, and an upper wall of the body 12a. The drive body 55a, which is housed in a recessed portion 54 provided so as to freely protrude and protrude downward from the lower surface in the figure, protrudes downward from a hole 54a drilled in the bottom of the recessed portion 54 so that the tip of the tip of the drive body 55a is movable. A return spring which is inserted between the push button 55 abutted on the top surface of the tip of the contact spring 53 and the driving body 55a and is compressed between the bottom of the recess 54 and the lower portion of the push button 55 to urge the push button 55 upward in the drawing. With 56 The fixed contact plate 50 and the movable contact spring plate 53 are respectively connected to the circuit board 15 via different lead wires 57, and when the movable contact 51 contacts the fixed contact 52 and is turned on, the operation at the “H” level is performed. The signal S1 is input to the other input terminal of the OR circuit 11.

  Here, the movable contact spring 53 is in a state in which the other end is bulged upward, and the push button 55 is pushed up from below by the urging force of the return spring 56 so that its head protrudes out of the body 12a, and the recess 54 Is provided in the vicinity of the display window hole 39 so that it is easy to understand during operation. During operation, the push button 55 is pushed down against the urging force of the return spring 56 and the movable contact spring 53, whereby the movable contact 51 of the movable contact spring 53 can be brought into contact with the fixed contact 52. In addition, only the biasing force of the movable contact spring 53 is required.

  Thus, the switchgear 1 of the present embodiment is disposed as an internal unit on the distribution board, and a load 2 such as an illumination load is provided between the pair of terminal screws 34, 34, and between the pair of terminal screws 43, 43. Is connected to an AC power source 4. The terminal screw 48 is connected to a signal line from the external remote control unit 6a.

  By connecting the AC power supply 4, power is supplied from the power supply unit 10 in the apparatus main body 12 to the circuits 5, 8, 9, 11 in the apparatus main body 12, and the circuits 5, 8, 9, 11 are supplied. The phase detection circuit 5 outputs the phase detection signal S2 to the signal processing circuit 9 corresponding to the zero crossing of the voltage of the AC power supply 4. Then, the signal processing circuit 6 waits for input of the operation signal S1 from the hand operation unit 6b or the remote operation unit 6a.

  When the operation signal S1 is input to the signal processing circuit 9 via the signal line or the OR circuit 11, the signal processing circuit 9 outputs the phase detection signal S2 from the phase detection circuit 5 in the normal state. When the input is awaited and the phase detection signal S2 is input, a predetermined delay time is further set, and an open / close signal is output to the drive circuit 4 when the delay time elapses. As a result, an excitation current in a direction that reverses the current state is supplied to the excitation coil 22 of the electromagnetic switching mechanism 9 to drive the electromagnetic switching mechanism 9. If the excitation coil 22 is energized in the direction in which the plunger 24 protrudes, the interlock lever 27 rotates around the shaft pin 30 in the direction in which the movable contact 3b contacts the fixed contact 3a as the plunger 24 protrudes. . The movable contact 17 is in contact with the fulcrum protrusion 37 and is urged counterclockwise in the drawing by the contact pressure spring 31 around the fulcrum protrusion 37, so that the contact pressure of the movable contact 3b with respect to the fixed contact 3a is the contact pressure. It will be obtained by the spring 31. In a state where the movable contact 3b is in contact with the fixed contact 3a, the state is maintained by the magnetic force of the permanent magnet 20 even when the energization to the exciting coil 22 is stopped. This state is the state shown in the figure. At this time, the characters “ON” of the display piece 40 are visible from the display window hole 39 as shown in FIG. 2A, and the state of the contact portion 3 is in the ON state. It is displayed.

  Next, when the operation signal S <b> 2 is input again to the signal processing circuit 9, the above processing operation is performed, and an open / close signal is sent to the drive circuit 8. The drive circuit 8 causes an excitation current in the opposite direction to the direction of the previous excitation current to flow through the excitation coil 22 and reversely drives the electromagnetic switching mechanism unit 7. As a result, the plunger 24 is retracted and the interlocking lever 27 rotates around the shaft pin 30 in the clockwise direction in the drawing, so that the movable contact 3b is separated from the fixed contact 3a and the contact portion 3 is opened.

  Then, when the interlocking lever 27 is rotated in the right direction in the drawing, the characters “OFF” of the display piece 40 can be seen from the display window hole 39, and it is displayed that the contact portion 3 is in the OFF state. The

  By the way, when the remote operation unit 6a breaks down, it becomes a problem if the load 2 such as lighting is continuously connected until the failure is corrected. In such a case, the distribution board provided with the switchgear 1 is used. In this case, the movable contact 52 of the movable contact spring plate 53 comes into contact with the fixed contact 52 of the fixed contact plate 50, and this is signaled as the operation signal S1 of the hand operated unit 6b. The processing circuit 9 is input, and the signal processing circuit 9 performs signal processing in the same manner as the operation on the remote operation unit 6a, and after a certain delay time, drives the electromagnetic switching mechanism unit 7 to open / close the contact unit 3. The phase is controlled. Thereby, inrush current can be suppressed to prevent contact welding, or arc discharge can be reduced to prevent contact wear. Further, the opening / closing device 1 can be opened / closed using the hand operation unit 6b even during inspection.

  As described above, the push button 55 is in the vicinity of the display window hole 39 of the display piece 40 and protrudes, so that it is easy to understand the folding of the manual operation, and the operation load of the push button 55 includes the return spring 56 and the movable contact. Since only the force resisting the urging force of the spring plate 53 is required, it is much smaller than the case where the electromagnetic switching mechanism portion 7 is moved manually, and the above is the universal design.

(Embodiment 2)
As described above, the purpose of phase control of the opening / closing of the contact portion 3 is to prevent the contact welding by suppressing the inrush current that flows to the load 2 at the time of closing, and it must always function. . Further, it is necessary to prevent contact wear due to arc discharge at the time of opening, and in this case as well, it is necessary to consider the number of opening and closing of several tens of thousands of times. It can be said that it is not a big problem even if phase control is not performed because it is performed only several times such as system failure or inspection. In addition, contact welding is prevented by phase control, but it cannot be said that contact welding occurs due to the number of times of opening and closing, usage conditions, and the like. In such a case, it may be necessary to open the contact portion 3 by forcibly moving the electromagnetic switching mechanism portion 7 manually as in the prior art.

  Therefore, in the present embodiment, as shown in FIGS. 3A and 3B, the display piece 40 can be seen from the display window 39 in a state where “ON” is displayed, and FIGS. In the state where the display piece 40 displays “OFF” as shown in b), an operation groove 59 for inserting a jig such as a screwdriver is formed at the surface position of the display piece 40 that cannot be seen from the display window hole 39. is there. Therefore, when the contact portion 3 is welded, that is, in the closed state, the tip of the jig is inserted from the outside into the operation groove 59, and the interlocking lever 27 is rotated in the opening direction (right direction) through the display piece 40. The movable contact 17 can be moved so that the plunger 24 is forcibly moved in the retraction direction and the welded movable contact 3b is separated from the fixed contact 3a. The retracted state of the plunger 24 is held by the electromagnetic opening / closing mechanism 7. When the display piece 40 is moved to the “OFF” display position, the operation groove 58 becomes invisible from the display window 39 and cannot be operated by a jig. However, phase control is performed by the hand operation unit 6b (or the remote operation unit 6a). The contact part 3 can be closed. That is, the closing operation cannot be performed by manual operation using a jig, but only by the operation of the hand operation unit 6b (or the remote operation unit 6a). As a result, the closing operation is reliably performed by phase control.

  When the contact is closed, the movable contact 3b is brought into contact with the fixed contact 3a after moving the distance moved when the contact is opened. On the other hand, when the contact is opened, immediately after the movable contact 17 is moved by the overtravel amount. In addition, since the movable contact 3b is separated from the fixed contact 3a, the opening operation is shorter than the closing operation, so that it is necessary to set a suitable delay time. Therefore, by alternately switching the delay time every time the operation signal S1 is input, a delay time suitable for opening / closing the contact portion 3 can be set. In this embodiment, the contact portion 3 is manually closed. Since it is possible to forcibly change the contact state to the open state, the method of switching alternately may cause a deviation.

  Therefore, in this embodiment, the state of the contact portion 3 is detected in conjunction with the movement of the interlocking lever 27, and this state detection information is given to the signal processing circuit 9, and the signal processing circuit 9 determines the delay time based on this information. By setting the delay time based on the actual state of the contact portion 3, optimal phase control is possible.

  In the present embodiment, an auxiliary contact portion 60 for detecting the state of the contact portion 3 is disposed below the fixed contact plate 50 of the hand operation portion 6 b, and the auxiliary contact portion 60 is formed to protrude from the interlocking lever 27. The operation is performed by the contact operation piece 62.

  The auxiliary contact portion 60 includes a contact substrate 63 disposed above the electromagnetic switching mechanism portion 7. The contact substrate 63 has two fixed contact plates 64a and 64b and movable contacts facing the fixed contact plates 64a and 64b, respectively. The contact plates 65a and 65b are fixed. Both movable contact plates 65a and 65b are fixed to the respective leg pieces of the substantially U-shaped contact support plate 66 and are electrically connected to each other, and each of the movable contact plates 65a and 65b corresponds to the corresponding fixed contact plate 64a, It has a spring force in the direction of contact with 64b. The contact operating piece 62 of the interlocking lever 27 is inserted between the movable contact plates 65a and 65b. When the interlocking lever 27 swings as the plunger 24 advances and retreats, at both terminal positions of the interlocking lever 27. One of the movable contact plates 65a and 65b is separated from the fixed contact plates 64a and 64b. That is, at the time of closing, as shown in FIGS. 3 (a) and 3 (b), the contact operating piece 62 is lowered downward to push down the movable contact plate 65a to release the movable contact from the fixed contact plate 64a. The contact plate 65b moves its tip downward by its spring force to bring the movable contact into contact with the fixed contact of the fixed contact plate 64b. At the time of opening, as shown in FIGS. 4 (a) and 4 (b), the contact operating piece 62 moves upward to push up the movable contact plate 65b to bring the movable contact into contact with the fixed contact of the fixed contact plate 64b. On the other hand, the movable contact plate 65a is moved upward by its spring force to separate the movable contact from the fixed contact plate 64a.

  The common connection point of the fixed contact plates 64a and 64b and the movable contact plates 65a and 65b is connected to the auxiliary contact portion state monitoring circuit 61 (see FIG. 5) on the circuit board 15 through the contact substrate 63, and the auxiliary contact portion state. The monitoring circuit 61 sends the contact state between the fixed contact plates 64a and 64b and the movable contact plates 65a and 65b to the signal processing circuit 9 as the state information of the contact part 3.

  Next, the circuit operation of this embodiment will be described based on the circuit configuration of FIG. 5 and the flowchart of FIG.

  When the AC power supply 4 and the load 2 are connected and the power supply unit 10 enters a power-on state in which power supply to the circuits 5, 9, 8, 11, 61 is started, the generation period of the phase detection signal S2 from the phase detection circuit 5 The signal processing circuit 9 performs processing for detecting the frequency of the AC power supply 4 based on the above (step S1), and sets the delay time (Ton) and delay time (Toff) at the closing time corresponding to the frequency detected by this processing. Selection is made from delay time data stored in advance for each frequency (60 Hz, 50 Hz) (step S2).

  After this selection process, the operation signal S1 is awaited for input (step S3). When the operation signal S1 is input from the remote operation unit 6a or the hand operation unit 6b through the OR circuit 11 during the input standby state, the signal processing circuit 9 changes the state of the contact unit 3 based on the information from the auxiliary contact unit monitoring circuit 61. After the determination (step S4), the input of the phase detection signal S1 is awaited in step S5 after the determination, and when the rising edge of the phase detection signal S1 is detected, if the determined state of the contact portion 3 is the open state, Since the next operation is closed, the delay time (Ton) is determined in step S6a. If the determined state of the contact portion 3 is the open state, the next operation is closed, so the delay is performed in step S6b. A time (Toff) is set, and after the delay time has elapsed, an open / close signal S3 is output to the drive circuit 8 to drive the electromagnetic opening / closing mechanism unit 7. As a result, the contact portion 3 is closed or opened near the zero cross of the AC power supply voltage. Then, the signal processing circuit 9 determines in step S7 whether or not the contact portion 3 has been inverted based on the information from the auxiliary contact portion monitoring circuit 61, and if so, returns to step S3 and returns to the next operation signal S1. Wait for the input, and if not inverted, return to Step S5 and wait until the next rising edge of the phase detection signal S2 is detected.

  In this way, in this embodiment, even when the contact portion 3 is forcibly opened manually, when the phase control of the opening / closing of the contact portion 3 by the operation signal S1 is performed, the state of the contact portion 3 is set. Based on this, an optimum delay time can be set.

1 is a circuit configuration diagram of Embodiment 1. FIG. The structure of the contact part of the contact part of Embodiment 1 is shown, (a) is a front view same as the above, (b) is a side view with a part broken away. The structure of the contact state of the contact part of Embodiment 2 is shown, (a) is a front view same as the above, (b) is a side view with a part broken away. The structure of the contact part of the contact part of Embodiment 2 is shown, (a) is a front view same as the above, (b) is a side view with a part broken away. 6 is a circuit configuration diagram of Embodiment 2. FIG. 6 is a flowchart for explaining operations of the second embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Switchgear 2 Load 3 Contact part 4 AC power supply 5 Phase detection circuit 6a Remote operation part 6b Hand operation part 7 Electromagnetic switching mechanism part 8 Drive circuit 9 Signal processing circuit 10 Power supply part 11 OR circuit 12 Device main body S1 Operation S2 Phase detection signal S3 Open / close signal T Signal terminal section

Claims (4)

An electromagnetic switching mechanism that opens and closes a contact portion inserted between a load and an AC power supply, a phase detection circuit that detects a specific phase of the AC power supply voltage applied to the load, and an operation that instructs a switching operation When an operation signal is output and an operation signal is input from the operation unit, an open / close signal is output after a certain delay time based on the timing of the phase detection signal output from the phase detection circuit after the input. A signal processing circuit; and a drive circuit that drives the electromagnetic switching mechanism by the open / close signal to open / close the contact, and the contact is opened / closed at a predetermined phase of the AC power supply voltage. In the switchgear in which the delay time is set, the operation unit includes a remote operation unit provided separately from the device main body, and a hand operation unit provided in the device main body, and from the remote operation unit operation Switchgear, characterized in that it comprises a device main body signal terminal unit for inputting items. A device having display means for displaying the open / close bear of the contact portion in conjunction with the operation of the electromagnetic opening / closing mechanism portion, a push button switch as the hand operation portion, and a display portion of the display means facing outside 2. The switchgear according to claim 1, wherein the push button of the push button switch is exposed at a position near the position of the main body. The interlocking mechanism between the display means and the electromagnetic opening / closing mechanism is provided with a manual interlocking function that allows the electromagnetic opening / closing mechanism to be driven in the opening direction when the display means is in an on-display state. The opening / closing device according to claim 2. The signal processing circuit determines the state of the contact part according to the state of the auxiliary contact part and determines the delay time corresponding to the closed state / open state, respectively. The switchgear according to any one of claims 1 to 3, wherein the switchgear is set.

Images