JP4332746B2 - Electromagnetic operation device - Google Patents

Description

  The present invention relates to an electromagnetic operating device, and more particularly, to an electromagnetic operating device suitable for operating a switch such as a circuit breaker using electromagnetic force.

  When operating a switch such as a circuit breaker, an operation is performed using electromagnetic force generated from an electromagnet (see Patent Document 1).

  On the other hand, when the electromagnet is driven, a capacitor for accumulating electric power for exciting the coil of the electromagnet, and a current supply direction from the capacitor to the electromagnet coil in response to a closing command or an opening command for the switch are controlled. Attempts have been made to provide a control board and operate the electromagnet stably.

Japanese Patent Laid-Open No. 2002-217062 (pages 2 to 4, FIGS. 1 to 3)

  When installing an electromagnetic operating device adjacent to a circuit breaker, etc., a configuration is adopted in which an electromagnet, a capacitor, a control board, etc. are housed in a case (case) and the electromagnet and the switch are connected via a link mechanism. Has been. However, when the electromagnet, capacitor and control board are housed in the housing, work in a narrow space inside the housing is unavoidable, so it is necessary to arrange the components in consideration of installation work, inspection and maintenance work. is there.

  In addition, inspection and maintenance work is performed by pulling out the electromagnetic operating device from the closing board, but when the breaker and other switches are closed, the electromagnetic operating device is pulled out to ensure safety so that the electromagnetic operating device cannot be pulled out. An interlock rod is provided to prevent this, and the interlock rod is locked to a locking step provided on the closing board side.

  However, if the interlock rod is displaced by some vibration such as the impact or vibration of the electromagnet, it may come off from the locking step, so a spring is required to hold the interlock rod in the locking position. It becomes an obstacle to reduce.

  An object of the present invention is to provide an electromagnetic operating device capable of improving safety of inspection / maintenance and reducing the number of parts.

In order to solve the above-mentioned problem, an electromagnetic operating device according to the present invention includes a movable iron core and a stationary iron core arranged opposite to each other, and an electromagnet having a coil that separates or contacts the movable iron core and the stationary iron core according to electromagnetic force. A capacitor for accumulating electric power for exciting the electromagnet coil, a control board for controlling an energization direction of a current supplied from the capacitor to the electromagnet coil in response to a closing command or an opening command for the switch, A shaft that is connected to a movable iron core and transmits a driving force accompanying an electromagnetic force generated from the electromagnet to the switch via a link mechanism, the electromagnet, a capacitor, the control board, and the shaft are housed on a mounting base. A case formed so as to be able to be pulled out by traveling, and provided in the case so as to be movable up and down, and inserted into a recess provided in the mounting base. Prevents withdrawal of the scan, the interlock rod formed by movable around a lead of the case when it is lifted upward, provided by pressing the upper portion of the interlock rod, the upward movement of the interlock rod An interlock switch that turns off the contact urged by the spring in response, and when the interlock rod is raised and the interlock switch is turned off , the input of a closing command to the control board is forced It is characterized by being interrupted.

With this configuration, when the interlock rod is raised, the switch input command is forcibly cut off, so that safety can be ensured even when the electromagnetic operating device is pulled out. Further, interlock switch pressing provided et is the top of the interlocking rod, the contacts which is biased by a spring in response to upward movement of the interlock rod is provided an interlock switch configured to be turned off from such as a spring for pressing the backing out from the recess to interlock rod is provided on the mount is displaced becomes unnecessary due to vibration or the like.

  Further, in the above electromagnetic operation device, comprising a lock pin fixed to the interlock rod and moving up and down together with the interlock rod, and a stopper pin disposed in the lift region of the lock pin and fixed to the link mechanism, When the switch is in the on state, the ascending operation of the interlock rod is prevented by contact between the lock pin and the stopper pin.

  According to the present invention, the safety of inspection / maintenance of an electromagnetic operating device can be improved and the number of parts can be reduced.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view of an electromagnetic operating device according to the present invention, and FIG. 2 is a side view of an electromagnetic operating switchgear including an electromagnetic operating device and a circuit breaker. 1 and 2, the electromagnetic operating device includes a case 10 formed in a box shape. The case 10 has an opening 12 on the front side, and a front cover (not shown) on the front side of the case 10. ) Is detachably fixed. In this case 10, a capacitor 16 and a control board 18 are separately and independently arranged around the electromagnet 14. The electromagnet 14 is fixed at the center of the case bottom using bolts and nuts. And the control board 18 are separately fixed to the opposite side surfaces of the case. That is, the capacitor 16 is fixed to the left side surface of the case 16 using bolts and nuts, and the control board 18 is fixed to the right side surface of the case 10 via the spacers 20 using bolts and nuts.

  Further, the secondary plug 22 and the cables 24, 26, 28, 30 are accommodated in the case 10, and an auxiliary contact as a state detection mechanism for detecting the state of a vacuum circuit breaker (vacuum valve) 32 as a switch. 34, a display board 36, and a counter 38 are accommodated. The secondary plug 22 is fixed to the upper side of the case 10 using bolts and nuts, and the secondary plug 22 is connected to a power cable, a signal cable from a digital relay or an analog relay, or the like. It has become. The cable 24 is connected to the plus terminal and the minus terminal of the capacitor 16, the cable 26 is connected to the auxiliary contact 34, and the cable 28 is connected to the control board 18 via the connector 40. The cable 28 is connected to the limit switch 42, and the cable 30 is connected to the coil 48 of the electromagnet 14. The cable 28 and the cable 30 are crimped at the portion of the terminal 43 at the time of attachment work. The limit switch 42 is fixed to the bottom side of the case 10 via a metal fitting 44. The limit switch 42 is configured to open and close in accordance with the position of an interlock rod 46 that is disposed on the case 10 so as to be movable up and down along the vertical direction. That is, as shown in FIG. 5, the limit switch 42 is provided by being pressed against the upper end of the interlock rod 46 via a lever, and is known via a lever that is displaced according to the lift position of the interlock rod 46. Thus, the contact urged by the spring is opened and closed. A signal indicating the open / closed state of the contact of the limit switch 42 is supplied to the control board 18.

  The control board 18 receives a power supply from the secondary plug 22 and receives a signal based on a closing command or an opening command (breaking command) from a digital relay or an analog relay, and performs a logical operation for controlling the driving of the electromagnet 14. A control logic unit that performs charging / discharging, a charging / discharging circuit for charging / discharging the capacitor 16, a relay, a relay contact, and the like for controlling the energization direction of the coil (electromagnetic coil) 48 are mounted (not shown). In addition, a light-emitting diode 50 indicating that charging of the capacitor 16 has been completed is mounted on the control board 18, and an “ON” push for instructing the vacuum circuit breaker 32 to be turned on manually. The button (push button switch) 52 and a “cut” push button (push button switch) 54 for outputting an opening command (break command) to the vacuum circuit breaker 32 by manual operation are mounted.

  The auxiliary contact 34, the display panel 36, and the counter 38 are disposed on the upper side of the electromagnet 14 as a state detection mechanism of the vacuum circuit breaker 32, are connected to the plate 56, and are integrated with the electromagnet 14. The electromagnet 14 includes a movable iron core 58, a fixed iron core 60, a coil 48, a shaft 62, two movable flat plates 64 and 66, permanent magnets 68, iron covers 70 and 72 formed in a cylindrical shape, an iron support plate 74, 76, a fixed rod 78, and the like. The coil (electromagnetic coil) 48 is accommodated in a coil bobbin 48a disposed between the support plate 74 and the support plate 76. It is fixed to the base 80 using bolts and nuts, and is fixed to the base 80.

  The shaft 62 is disposed at the center of the electromagnet 14 and is disposed along the vertical direction. The shaft 62 has an upper side inserted into the through hole 82 of the plate 66 and a lower side inserted into the through hole 84 of the support plate 76 so as to be movable up and down and slidable. A movable iron core 58 and movable flat plates 64 and 66 are fixed to the outer peripheral surface of the shaft 62 using nuts, and a shaft 88 is connected to the lower side of the shaft 62 via a pin 86. Two large and small movable flat plates (steel plates) 64 and 66 are attached to the shaft 62, which increases the facing distance between the upper movable flat plate 64 and the iron cover 70, thereby making the iron cover 70. This is to reduce the leakage magnetic flux to the head. Further, a support plate 90 is connected to the lower side of the shaft 62, and a ring-shaped blocking spring 92 that draws a circle centering on the axis of the shaft 62 is mounted between the support plate 90 and the base 80. ing. The cutoff spring 92 applies an elastic force for separating the movable iron core 58 from the fixed iron core 60 to the shaft 62 via the support plate 90. A permanent magnet 68 is disposed around the movable iron core 58, and the permanent magnet 68 is fixed to the mounting plate 74. The fixed iron core 60 is fixed to the mounting plate 76 using bolts.

  The lower side of the shaft 88 is connected to a pair of levers 96 via pins 94. The lever 96 is configured as one element of a link mechanism that changes the transmission direction of the driving force accompanying the electromagnetic force generated from the electromagnet 14, and is connected to the lever 100 via the shaft 98. The lever 100 is connected to the connecting plate 104 via a pin 102. A stopper pin 106 is fixed to the end of the lever 96. The stopper pin 106 abuts (contacts) with a stopper bolt 108 fixed to the base 80 when the vacuum circuit breaker 32 is shut off. In addition, the movement of the lever 96 toward the base 80 is prevented.

  The connecting plate 104 is inserted in an insulating frame 110 fixed to the base 80 so as to be movable up and down (reciprocating), and a contact pressure spring presser 112 is formed on the upper side of the connecting plate 104. A through hole is formed in the contact pressure spring retainer 112, and an axial end portion of the insulating rod 114 is inserted into the through hole, and a bolt 118 is fixed to this end portion via a washer 116. . Further, a contact pressure spring 120 is mounted between the contact pressure spring presser 112 and the bottom side of the insulating rod 14. The upper side of the insulating rod 114 is connected to the movable feeder 122 via the flexible conductor 121 and is also connected to the movable conductor 124 of the vacuum circuit breaker 32. The movable conductor 124 is connected to a movable contact (not shown), and a fixed contact (not shown) is arranged opposite to the movable contact. The fixed contact is connected to the fixed conductor 126 and is housed in the insulating cylinder 128 together with the movable contact. The insulating cylinder 128 is kept in a vacuum. The fixed conductor 126 is connected to a fixed feeder 129, and the fixed feeder 129 is fixed to the insulating mount 110. An upper contactor 130 is connected to the fixed feeder 129, a lower contactor 132 is connected to the movable feeder 122, and a power cable such as a distribution line is connected to each of the contactors 130 and 132.

  Here, when an input command is input to the control board 18, a coil (electromagnetic coil) 48 of the electromagnet 14 is energized by a signal from the control board 18, and the movable iron core 58 ⇒ fixed iron core 60 ⇒ is surrounded around the coil 48. A magnetic field is formed in a path connecting the mounting plate 76 ⇒ the cover 72 ⇒ the mounting plate 74 ⇒ the movable iron core 58, and a downward attractive force acts on the bottom end surface of the movable iron core 58, so that the movable iron core 58 moves to the fixed iron core 60 side. The movable iron core 58 is adsorbed to the fixed iron core 60. At this time, the direction of the magnetic field formed by the permanent magnet 68 is also the same as the direction of the magnetic field generated by the excitation of the coil 48. Therefore, the movable iron core 58 moves to the fixed iron core 60 side with an increased attractive force. .

  When the closing operation (suction operation) by the electromagnet 14 is performed, the shaft 62 moves downward against the elastic force of the cutoff spring 92, and the driving force accompanying the electromagnetic force generated from the electromagnet 14 is transmitted to the lever 96. . This driving force is transmitted to the connecting plate 104 via the shaft 98 and the lever 100, the movable conductor 124 moves upward, the movable contact contacts the fixed contact, and the closing operation of the vacuum circuit breaker 32 is executed. In the closing operation of the vacuum circuit breaker 32, the contact pressure spring 120 is not compressed until the fixed contact and the movable contact are in contact, but is compressed when the fixed contact and the movable contact are in contact, and then compressed until the closing operation is completed. to continue. On the other hand, the cutoff spring 92 is always compressed during the closing operation of the vacuum circuit breaker 32.

  Next, when an opening command (shut-off command) is input to the control plate 18 and a signal associated with the opening command is output from the control plate 18 to the coil 48, a current in the direction opposite to that at the time of application is applied to the coil 18. A magnetic field in the direction opposite to that during the closing operation is formed around the coil 48. In this case, the magnetic flux generated from the coil 48 and the magnetic flux generated from the permanent magnet 68 cancel each other, and the attractive force at the axial end surface (lower surface) of the movable iron core 58 is the elasticity generated from the cutoff spring 92 and the contact pressure spring 120. Since it becomes weaker than the force, the movable iron core 58 moves away from the fixed iron core 60 and moves upward. When the shaft 62 moves upward in accordance with the movement of the movable iron core 58, the connecting plate 104 moves downward in conjunction with the upward movement of the lever 96, and the movable contact of the vacuum circuit breaker 32 moves away from the fixed contact. The contact between the contact and the movable contact is released, and the opening operation (breaking operation) of the vacuum circuit breaker 32 is performed. In this case, when the holding state of the electromagnet 14 is released, first, the compressed contact pressure spring 120 expands and the contact pressure spring presser 112 comes into contact with the washer 116. The contact between the fixed contact and the movable contact is released, and the breaking operation of the vacuum circuit breaker 32 and the breaking (opening) operation of the electromagnet 14 are performed simultaneously.

  In the process in which the closing operation or the opening operation (breaking operation) is performed by the vacuum circuit breaker 32, the closing or closing state of the vacuum circuit breaker 32 is detected by the auxiliary contact 34, the display board 36, and the counter 38. ing.

  Specifically, as shown in FIG. 2, a rod 134 is connected to the upper side of the shaft 62 connected to the movable iron core 58. A through hole (not shown) is formed on the upper side of the rod 134, and a pin 136 is inserted into the through hole. The pin 136 is inserted into the elongated holes of the levers 138 and 140, and the rod 134 is connected to the lever 138 and the lever 140 via the pin 136. The lever 138 is connected to the auxiliary contact 34 via the shaft 142. The auxiliary contact 34 has an a contact and a b contact, and each contact opens and closes in accordance with the vertical movement of the shaft 62. That is, the auxiliary contact 34 has a structure in which the contact a enters when the shaft 142 rotates in one direction, and the contact b enters when the shaft 142 rotates in the opposite direction. In this case, since a long hole is formed in the lever 138 and a pin 136 is inserted into the long hole, the shaft 142 can be rotated in accordance with the vertical movement of the shaft 62, and in accordance with the rotation operation of the shaft 142. The a contact and the b contact can be turned on and off.

  The lever 140 is connected to the fixed plate 146 via a pin 144, and the fixed plate 146 is fixed to the plate 56 at the bottom side. The lever 140 is configured to be rotatable around the pin 144 in accordance with the vertical movement of the shaft 62. A display plate 36 is integrally formed on the front end side of the lever 140, and “cut” is attached to the upper side of the front side of the display plate 36, and “on” is given to the lower side. "Is attached. The characters “OFF” are visible from the front side of the case 10 when the display board 36 is in the position shown in FIG. 2, and the letters “ON” are the positions where the display board 36 is shown in FIG. When viewed from above, the case 10 is visible from the front side. That is, it is configured such that the characters “OFF” or “ON” can be seen from the front side of the case 10 in accordance with the vertical movement of the shaft 62.

  Further, a spring 148 is disposed on the display plate 36, one end of the spring 148 is connected to the axial end of the lever 140, and the other end is connected to the counter lever 150 of the counter 38. The spring 148 expands and contracts in response to the rotation of the lever 140, and the counter lever 150 rotates about the pin 152 (rotates in a range of about 45 degrees). Every time the counter lever 150 rotates, a vacuum is generated. The number of opening / closing operations of the circuit breaker 32 is mechanically counted.

  Next, a specific operation of the state detection mechanism will be described. First, when a closing operation is performed in the vacuum circuit breaker 32, as shown in FIG. 3, the shaft 62 moves downward, and the lever 138 rotates clockwise about the shaft 142 in accordance with the movement of the shaft 62. As a result of the rotation of 138, the b contact of the auxiliary contact 34 is turned off, and then the a contact is turned on. At this time, since the lever 140 rotates counterclockwise around the pin 144, the display board 36 moves to a position where the letters “ON” can be seen from the front side as shown in FIG. Further, the spring 148 contracts and the counter lever 150 rotates about 45 degrees around the pin 152. Accordingly, the counter 38 counts that the vacuum circuit breaker 32 has been turned on once.

  Next, when the breaking operation of the vacuum circuit breaker 32 is started, the shaft 62 moves upward from the position shown in FIG. In conjunction with the upward movement of the shaft 62, the lever 138 rotates counterclockwise about the shaft 142, the shaft 142 of the auxiliary contact 34 rotates, the a contact of the auxiliary contact 34 is cut, and then the b contact. Is turned on. Further, in conjunction with the upward movement of the shaft 62, the lever 140 rotates clockwise around the pin 144, and as shown in FIG. 4, the character “OFF” on the display board 36 moves to a position where it can be seen from the front. At this time, as the lever 140 rotates, the spring 148 extends, and the counter lever 150 rotates about 45 degrees around the pin 152. The spring 148 is preferably attached in a state where the character “ON” of the display plate 36 is slightly bent while being visible from the front.

  In this way, every time the closing operation or the opening operation (breaking operation) by the vacuum circuit breaker 32 is performed, the closing or breaking state of the vacuum circuit breaker 32 can be detected by the auxiliary contact 34, the display board 36, and the counter 38. it can.

  On the other hand, four wheels 154 are connected to both sides of the base 80 so as to be able to run on the mounting base 156. That is, the electromagnetically operated switchgear including the case 10 containing the electromagnet 14 and the insulating mount 110 containing the vacuum circuit breaker 32 is carried out to the front side of the case 10 by traveling of the wheel 150 while being fixed to the base 80. It is possible.

  However, in this embodiment, in order to enable the vacuum circuit breaker 32 to be taken out (drawn) on condition that the vacuum circuit breaker 32 is in the cut-off state at the cut position and the interlock rod 46 is lifted, FIG. As shown in FIG. 5, a bracket 162 that defines an operation position 158 and a disconnection position 160 is fixed to the mounting base 156, and an interlock lever 164 is fixed to the upper side of the interlock rod 46. 164 is inserted into an operation hole 168 of an attachment member 165 attached to the bottom surface of the case 10. Further, a lock pin 170 is fixed to the bottom side of the interlock rod 46. When the interlock lever 164 is at the lower side, the interlock rod 46 is inserted into a recess where the bottom side is the operating position 158, and the bracket 162 In this structure, the vacuum circuit breaker 32 cannot be pulled out.

  That is, when the vacuum breaker 32 is in the cut-off position at the cut position and the interlock rod 46 is not lifted, it is impossible to carry out (draw out) the vacuum breaker 32.

  At this time, the limit switch 42 as the interlock switch is in an ON state, and the signal as the input command input to the control board 18 is not interrupted by the limit switch 42.

  Next, when the interlock lever 164 is operated and moved upward when the circuit breaker 32 is in the disconnected state, the interlock rod 46 moves upward as the interlock lever 164 moves upward as shown in FIG. The vacuum circuit breaker 32 can be pulled out.

  That is, the electromagnetically operated switchgear can be pulled out to the front side and moved to the disconnection position 160. However, in this case, the limit switch 42 is turned off as the interlock rod 46 moves upward, the input of the input command to the control board 18 is forcibly interrupted, and the input operation to the vacuum circuit breaker 32 becomes impossible. Yes.

  On the other hand, when the circuit breaker 32 is in the on position and is in the on state, as shown in FIG. 7, the stopper pin 106 and the lock pin 170 come into contact with each other so that the upward movement of the interlock rod 46 is prevented. It has become. That is, even if the interlock lever 164 is operated, the ascending movement of the interlock rod 46 is prevented by the contact between the stopper pin 106 and the lock pin 170, and the vacuum circuit breaker 32 cannot be pulled out.

  Further, in this embodiment, in order to allow the vacuum circuit breaker 32 to be shut off by manual operation even when the front cover 166 is attached to the case 10, as shown in FIG. A hole 174 for inserting the blocking handle 172 is formed at a position removed from the front cover 166. Since the shut-off operation using the handle 172 has an operating speed, it can be applied to all cases where a shut-off operation is required. That is, the handle 172 can always be inserted into the hole 174 regardless of the presence or absence of the front cover 166, and when the vacuum circuit breaker 32 is in the on state, the front end side of the handle 172 is inserted into the hole 174. When the tip of the handle 172 is pressed against the lower side of the stopper pin 106 and the handle 172 is pushed downward with the bottom side of the hole 174 as a fulcrum, the lever 96 rotates counterclockwise around the shaft 98 and shuts off. The interruption | blocking operation | movement with respect to the device 32 can be performed. In this case, if a force greater than the holding force of the permanent magnet 68 is first applied by the handle 172, the circuit breaker 32 can be shut off by the elastic force of the shut-off spring 92 and the contact pressure spring 120 thereafter.

  On the other hand, in order to perform the closing operation to the vacuum circuit breaker 32 by manual operation only when the front cover 166 is removed, in this embodiment, as shown in FIG. A hole 178 into which the distal end side of the charging handle 176 can be inserted is formed following the hole 174.

  Since the operating speed using the charging handle 176 does not come out, it is possible only when the circuit breaker 32 is taken out of the switchboard at the time of assembly (disassembly) work or maintenance / inspection (periodic inspection). For this reason, the hole 178 is exposed only when the front cover 166 is removed. When the vacuum circuit breaker 32 is turned on by manual operation using the handle 176, the front cover 166 is removed, and then the distal end side of the closing handle 176 is inserted into the hole 178 of the base 80. In this case, the handle 176 is inserted into the hole 178 so that the distal end side of the handle 176 contacts the upper side of the stopper pin 106. Thereafter, when the handle 176 is moved upward with the upper side of the hole 178 as a fulcrum while the tip end side of the handle 176 is inserted outside the lever 96 and in contact with the upper side of the stopper pin 106, the lever 96 Rotates clockwise around the shaft 98, and the closing operation of the circuit breaker 32 is performed.

  In this embodiment, the insertion operation by manual operation can be performed only by removing the front cover 166, and the opening operation by manual operation can be performed without removing the front cover 166. A hole 174 into which the opening operation handle 172 can be inserted is formed in an area away from the front cover 166 and facing the stopper pin 106, and faces the stopper pin 106 in the mounting area of the front cover 166 in the base 80. A hole 178 into which the loading operation handle 176 can be inserted is formed in the region.

  When assembling the electromagnetic operating device, the electromagnet 14, the capacitor 16, the control board 18, the secondary plug 22, the cables 24 to 28 and the like are carried into the case 10 from the front side of the case 10 on the base 80. The capacitor 16 and the control board 18 are respectively fixed to the side surfaces of the case 10. In this case, since the auxiliary contact 34, the display panel 36, and the counter 38 are integrated with the electromagnet 14 via the plate 56, they are arranged on the upper side of the electromagnet 14 when the electromagnet 14 is fixed. Further, since the cables 24 to 28 are integrated with the secondary plug 22, the connector 40, and the limit switch 42, the secondary plug 22 is fixed to the upper portion of the case 10 while being connected to the cable 28 or the like. . When each part of the cable 28 is positioned in the case 10, the tip end side of the cable 24 is connected to the capacitor 16, and the connector 40 attached to the tip end side of the cable 28 is connected to the control board 18. A part of the cable 30 and the cable 28 is crimped. Thereafter, when the shaft 88 is connected to the lever 96 via the pin 94, the electromagnet 14 is connected to the vacuum circuit breaker 32 via the link mechanism, and the assembling work is completed.

  As described above, when configuring the electromagnetic operating device as one element of the electromagnetic operation type opening / closing device, the electromagnet 14 is disposed at the approximate center of the case 10, and the capacitor 16 and the control board 18 are separately provided around the electromagnet 14. Since it is fixed to the side surface of the case 10, mounting work and maintenance / inspection work can be easily performed, workability can be improved, and the impact and vibration generated from the electromagnet 14 can be reduced. Transmission to the control plate 18 can be suppressed.

  In addition, since the auxiliary contact 34, the display panel 36, and the counter 38 are connected to the plate 56 and integrated with the electromagnet 14, the configuration can be simplified.

  In the present embodiment, since the electromagnet 14 is entirely covered with an iron member, a magnetic field does not leak outside the electromagnet, and a malfunction of the control circuit can be avoided. Furthermore, the problem that the characteristics of the electromagnet 14 change depending on the arrangement of the magnetic body outside the electromagnet, for example, the case 10, is also solved.

  Further, in the present embodiment, a sliding part in which one member and the other member among the constituent members slide with each other, and a bearing part or a rotating part in which one member rotatably supports the other member include a solid part. Lubricant is used.

  Specifically, the sliding portion in the through hole 82 of the plate 56, the through hole 84 of the mounting plate 76, the rotating portion or the bearing portion in the pins 86, 94, 102, 144, the shaft 98, etc. are used as solid lubricant. Dry bearings are used. Therefore, the shaft 62 can be smoothly slid (up and down), the levers 96, 100, and 140 can be rotated smoothly, and other members can be supported smoothly, and the electromagnet 14 can be sealed.

  In addition, since a C ring is used as a pin for the pin 94 or the like, workability can be improved as compared with the case of using a split pin.

  Next, a specific configuration of the electromagnet control device having the control board 18 as a main component will be described with reference to FIG. The electromagnet control device includes an AC / DC converter 200, a charging circuit 202, a control logic unit 204, and a discharging circuit 206. The capacitor 16 and the electromagnetic coil 48 are connected to the discharging circuit 206.

  The AC / DC converter 200 receives direct-current or alternating-current control power supplies P and N from the secondary plug 22. The direct-current or alternating-current control power P, N is converted into direct current in the case of direct current. It is supposed to be. The charging circuit 202 charges the capacitor 16 at a high speed and then gradually charges up to the maximum voltage. The driving of the electromagnetic coil 48 is controlled by the electric power stored in the capacitor 16.

  That is, the discharge circuit 206 is provided with an FET (field effect transistor) 208 as a main control means, a pair of relay contacts 210 and 212, a diode D1, and a resistor RL. The FET 208 is inserted into an energizing circuit that supplies power (current) from the capacitor 16 to the electromagnetic coil 48, and is on / off controlled in accordance with a control signal from the control logic unit 204. The relay contacts 210 and 212 constituting the pair of mechanical switching relays are inserted in an energization circuit that supplies power from the capacitor 16 to the electromagnetic coil 48, and the relay contacts 210 and 212 have a common c contact, A contact and a b contact are provided. The relay contact 210 has an a contact connected to one end of the electromagnetic coil 48, a b contact connected to the other end of the electromagnetic coil 48, and a c contact connected to the plus side of the capacitor 16.

  On the other hand, the relay contact 212 has a b contact connected to one end of the electromagnetic coil 48, an a contact connected to the other end of the electromagnetic coil 48, a c contact connected to the FET 208, a resistor RL, and a diode D1. To the contact c of the relay contact 210.

  The relay contacts 210 and 212 constituting the switching relay are movable as an energization circuit in which the c contact and the b contact are connected to each other and the electric power from the capacitor 16 is supplied to the electromagnetic coil 48 when the opening command (breaking command) is generated. It is configured as an opening means for forming an energization circuit for separating the iron core 58 and the fixed iron core 60 from each other. Further, the relay contacts 210 and 212 are switched when the input command is generated, and the c contact and the a contact are connected, and the energization circuit by the opening means is an electromagnetic circuit that is supplied from the capacitor 16 to the electromagnetic coil 16. As an energizing circuit in which the energizing direction to the coil 48 is reversed, an energizing circuit for bringing the movable iron core 58 and the fixed iron core 60 into contact with each other is formed, and the energizing circuit formed when the opening command is generated is interrupted. It is configured. After the energization circuit for making up or the energization circuit for opening (breaking) is formed by the relay contacts 210 and 212, the FET 208 is turned on and off to turn on and off the coil current of the electromagnetic coil 48.

  That is, only the energization performance is required for the relay contacts 210 and 212 as switching relays, and the FET 208 having a large switching capacity is used as the main switch, so that the cost and size can be reduced. ing.

  In addition, since the contact b of the relay contacts 210 and 212 is used as the opening means, even if the relay contacts 210 and 212 malfunction, only the opening operation can be performed reliably.

  Further, when the coil current of the electromagnetic coil 48 is interrupted by the FET 208, an overvoltage proportional to the current conversion rate is generated, and the electromagnetic coil 48 may be damaged.

  However, in this embodiment, since the resistor RL and the diode D1 as energy consuming elements are connected in parallel with the electromagnetic coil 48, even if an overvoltage is generated from the electromagnetic coil 48 during the closing operation and the opening operation. The energy associated with this overvoltage can be consumed by the resistor RL.

  As shown in FIG. 11, the charging circuit 202 includes a relay coil 214, a relay contact 216, an FET 218, a charging completion detection circuit 220, a plurality of charging resistors Rb and Rs, a diode D2, and a plurality of zener diodes ZD1 to ZDn. The Zener diodes ZD1 to ZDn are connected in series with each other and connected to both ends of the capacitor 16 so as to maintain the charging voltage of the capacitor 16 at a specified value.

  The charging resistors Rb and Rs have different resistance values and are set to have a relationship of charging resistance Rb> Rs. The charging resistors Rb and Rs are arranged in series with the diode D2 in the circuit connecting the AC / DC converter 200 and the capacitor 16. At the start of charging, a high level signal is output from the charging completion detection circuit 220, the FET 218 is turned on, the relay 214 is turned on, the relay contact 216 is switched from the b contact to the a contact, and the resistance value is small. A charging resistor Rs is inserted into a circuit for charging the capacitor 16 so that the capacitor 16 is rapidly charged.

  On the other hand, when the charging voltage of the capacitor 16 becomes a voltage Vt1 sufficient to drive the electromagnet 14, a low level charging completion signal is output from the charging completion detection circuit 220, the FET 218 is turned off and the relay 214 is turned off. The relay contact 216 returns from the a contact to the b contact side, and a charging resistor Rb having a large resistance value is inserted into the charging circuit, and the capacitor 16 is gradually charged to reach the maximum charging voltage Vmax.

  As described above, since the charging resistance is switched to the high resistance side after the charging voltage of the capacitor 16 reaches Vt1, the charging voltage of the capacitor 16 reaches Vmax and then flows into the Zener diodes ZD1 to ZDn. The current can be reduced, and the Zener diodes ZD1 to ZDn can be prevented from being thermally destroyed. The FET 218, the relay coil 214, and the relay contact 216 constitute charge resistance switching means.

  As shown in FIG. 12, the charge completion detection circuit 220 is set with a hysteresis upper limit value Vt1 and a hysteresis lower limit value Vt2 as a voltage range for outputting a charge completion signal. After the charging voltage of the capacitor 16 reaches the hysteresis upper limit value Vt1, a low level signal is output as a charging completion signal until the charging voltage of the capacitor 16 becomes equal to or lower than the hysteresis lower limit value Vt2. Hysteresis lower limit value Vt2 is a lower limit voltage that is a condition under which the residual voltage of capacitor 16 outputs a charge completion signal even if the opening operation is performed immediately after the charging voltage of capacitor 16 becomes equal to or higher than hysteresis upper limit value Vt1. It is set to a value that is not less than the value. Further, the charging voltage maximum value Vmax of the capacitor 16 is set to 90% or more of the minimum voltage in the control voltage fluctuation range defined by the standard of the vacuum circuit breaker 32 to be operated of the electromagnetic coil 48.

  That is, there are the following three types of operation responsibilities for the circuit breaker, and the hysteresis characteristics of the charging resistance Rs and the charge completion detection circuit 220 must be set to values that satisfy the following responsibilities.

Class A “O” -1min- “CO” -3min- “CO”
Class B "CO" -15s- "CO"
R type "O" -0.35s- "CO" -3min- "CO"
O represents an opening operation (Open), and C represents a closing operation (Close).

  The above operation responsibilities are defined in JEC-2300-1998. Specifically, the B type and the R type with short time intervals between the operation times are set as a reference.

  For example, as shown in FIG. 13, the resistance value of the charging resistor Rs is determined so that the time from the capacitor residual voltage after the “CO” operation to Vt1 is 15 s or less, and the operation responsibility B type is satisfied. . Further, as shown in FIG. 14, even when the “O” operation is once performed, the hysteresis lower limit value Vt2 is determined so that the output of the charge completion detection circuit 220 is maintained at the low level, thereby enabling the operation duty R type.

  Further, the maximum value Vmax of the charging voltage of the capacitor 16 determined by the Zener diodes ZD1 to ZDn must be equal to or less than the minimum value (minimum voltage) in the control voltage fluctuation range defined by the circuit breaker standard. Moreover, as shown in FIG. 15, the charging energy of the capacitor 16 is proportional to the square of the charging voltage, so it is desirable to set the voltage to 90% or more of the minimum value.

  For example, JEC-2300-1998 stipulates a fluctuation of 75% to 125% with respect to the rated control voltage, and when the rated control voltage is DC100V, 75V × 0.9 = 67.5V or more. Vmax may be set.

  On the other hand, as shown in FIG. 16, the closing command 42 is input to the control logic unit 204 via the limit switch 42 as an interlock and the relay contact 222 linked to the relay 214, and the opening command is input. Has been. Further, auxiliary contacts 48 a and 48 b that are opened and closed according to the state of the vacuum circuit breaker 32 are connected to the control logic unit 204. The control logic unit 204 performs a logical operation based on the input command, the opening command, and the state of the vacuum circuit breaker 32 to control the FET 208, the relay 214, the relay contacts 210 and 212 as switching relays, and the like. Is output. The relay contact 222 is configured as a closing command control unit that prohibits input of a closing command until a charging completion signal is generated from the charging completion detection circuit 220.

  Next, the operation of the control logic unit 204 will be described with reference to FIG. When performing the closing operation according to the control signal generated by the control logic unit 204, in the present embodiment, the closing command is accepted and the control signal is sent only when the two conditions of turning on the interlock and completing the charging of the capacitor are satisfied. It is designed to generate.

  That is, the relay contacts 210 and 212 as switching relays are switched to the a contact side on the condition that the interlock is turned on and the relay contact 222 is turned off when the closing command is generated, and the electromagnetic coil 48 As a current-carrying circuit, a circuit for performing a closing operation is formed, and then the FET 208 is turned on and the electromagnetic coil 48 is excited. Thereby, the movable iron core 58 and the fixed iron core 60 come into contact with each other, and the closing operation of the circuit breaker 32 is performed. In this process, the auxiliary contact 48b indicating the breaking state of the circuit breaker 32 is switched from on to off, and then the auxiliary contact 48a indicating the closing state of the circuit breaker 32 is contacted after the movable contact and the fixed contact of the circuit breaker 32 are in contact. Turn on.

  After the closing operation of the circuit breaker 32 is completed, the FET 208 is turned off at an appropriate timing. After the FET 208 is turned off, the energy accumulated in the electromagnetic coil 48 is consumed by the resistor RL. However, after the coil current is sufficiently attenuated, the relay contacts 210 and 212 as switching relays are turned off to perform a closing operation. To complete.

  On the other hand, when performing the opening operation, as shown in FIG. 18, without any particular restriction, when the FET 208 is turned on after the opening command is generated, the relay contacts 210 and 212 are on the b contact side, respectively. The coil 48 is excited by a current in the direction opposite to that in the closing operation, the movable iron core 58 is separated from the fixed iron core 60, and the breaking operation of the breaker 32 is performed. In the process of performing the breaking operation, the auxiliary contact 48a indicating the circuit breaker 32 is switched from on to off, and then the auxiliary contact 48b indicating the circuit breaker 32 is switched from off to on.

  According to this embodiment, the energization circuit is switched by the relay contacts 210 and 212, and the energization circuit is turned on / off by the FET 208. Therefore, the relay contacts 210 and 212 are configured with a small capacity, and the FET 208 Can be configured with a large capacity, and cost and size can be reduced.

  Further, by executing a sequence operation defined in the control logic unit 204, an open circuit priority function and a pumping prevention function can be realized.

  Next, another embodiment will be described with reference to FIG. In this embodiment, relay contacts 224 to 230 as switching relays that operate according to a control signal from the control logic unit 204 are provided instead of the relay contacts 210 and 212 as switching relays. It is the same as that of FIG.

  The relay contact 224 is normally connected to the positive side of the capacitor 16 in the open state (off), and is turned on in response to only the closing command to close the contact. And is connected to one end side of the coil 48. When the relay contact 226 is off, the contact is in a closed state and is connected to the plus side of the capacitor 16, and is configured to turn on in response to only the input command to open the contact. The relay contacts 228 and 230 are configured to be turned on in response to only the opening command, and the relay contact 228 is connected to one end side of the coil 48 when turned off, and one end side of the coil 48 and the FET 208 when turned on. And an energization circuit for performing an opening operation is formed. The relay contact is connected to the other end side of the coil 48 and the resistor RL when turned off, and is connected to the other end side of the coil 48 and the plus side of the capacitor 16 when turned on so as to form an energization circuit for performing an opening operation. It has become.

  In other words, when a closing command is generated, the relay contacts 224 and 226 are turned on while the relay contacts 228 and 230 are off, and the relay contacts 224, 228 and 230 perform a closing operation as an energization circuit for the electromagnetic coil 48. An input means for forming an energization circuit is configured. On the other hand, when the opening command is generated, the relay contacts 224 and 226 are turned off, the relay contacts 228 and 230 are turned on, and the relay contacts 226, 228 and 230 are inserted into an energization circuit for performing the opening operation, Opening means for opening the circuit breaker 32 is configured.

  According to the present embodiment, the energization circuit is switched by the relay contacts 224 to 230, and the energization circuit is turned on / off by the FET 208. Therefore, the relay contacts 224 to 230 are configured with a small capacity, and the FET 208 Can be configured with a large capacity, and cost and size can be reduced.

  In this embodiment, on the condition that the relay contacts 224 and 226 are turned on when the closing command is generated, the FET 208 is turned on to excite the electromagnetic coil 48 to perform the closing operation of the circuit breaker 32 to open the contact. When the command is generated, on the condition that the relay contacts 228 to 230 are turned on, the FET 208 is turned on to excite the electromagnetic coil 48 so that the circuit breaker 32 is cut off. Even when the voltage drive type FET 208 malfunctions due to surge noise or the like when -230 is off, the vacuum circuit breaker 32 can be prevented from malfunctioning.

  When the electromagnetic operation type switchgear is configured by combining the electromagnetic operation device and the magnetic latch type electromagnetic operation type vacuum circuit breaker 32 in the embodiment, the control logic unit 204 may be a microcomputer and a logic IC (CPLD / FPGA). Can be configured using a mechanical relay or the like, and the current required for the closing command / opening command is about several tens of mA, and a small energy switching device can be configured.

  In other words, as a relay that gives an opening command to the circuit breaker, a digital type relay has become mainstream in recent years, which is convenient when a circuit breaker that can be operated with a small current is to be operated. However, there are many conventional analog relays as relays that give an opening command to the circuit breaker. When the electromagnetically operated switchgear according to the present invention is applied to a switchboard equipped with an analog relay, the opening command Unmatching occurs at the point of the current value.

  For example, as shown in FIGS. 20 (a) and 20 (b), when a current exceeding a specified value flows through a current transformer 302 that detects a current of a circuit breaker 300 (a circuit breaker corresponding to the circuit breaker 32), The main contact 306 connected to 304 is turned on, and the auxiliary contactor 308 operates. At this time, an opening command (trip command) is output from the auxiliary contactor 308 to the circuit breaker 300, and at the same time, the display 310 is operated. That is, the opening command requires not only the circuit breaker 300 to operate but also a current that can operate the display 310, and the value thereof is 2 to 5A. For this reason, when configuring an electromagnetically operated switchgear, it is necessary to operate both the analog relay / breaker 300 normally.

  Therefore, in the present embodiment, when configuring the electromagnetically operated switchgear, as shown in FIG. 21, a part of the opening command is passed through the resistor 312 to the minus of the AC / DC converter 200 serving as a power source. A bypass circuit that bypasses to the (ground) side (control power supply N) is configured, and in this bypass circuit, an auxiliary contact 314 that shuts off the bypass circuit in response to the shut-off operation of the vacuum circuit breaker 32, and in response to an operation A jumper switch 313 for opening and closing the contact is inserted, and a resistor 312 is mounted on the control board 18.

  When the above configuration is adopted, when the input impedance of the control logic unit 204 is high and a current of about several tens of mA flows through the control logic unit 204, when an analog relay is used as a relay, the jumper switch 313 is used. Is turned on to close the bypass circuit, and the opening command of about several amperes output from the analog relay can be bypassed via the resistor 312 and the auxiliary contact 314.

  The resistor 312 can be set according to the rated control voltage. For example, the resistor 312 can be about 30 ohms with a DC 100V input. In this case, the current of the opening command transmitted from the analog relay is about 3 A, the display 310 and the circuit breaker 300 can be operated together, and the auxiliary contact 310 can be disconnected in synchronization with the circuit breaker 300. It is possible to ensure compatibility even when a conventional relay is used.

  According to this embodiment, even if a digital relay or an analog relay is used as the relay, both the relay and the circuit breaker can be operated in a stable state.

  In the above embodiment, the resistor 312 is mounted on the control board 18. However, the resistor 312 is not necessarily mounted on the control board 18. For example, as shown in FIGS. 22 and 23, an analog relay is provided. Only when it is used, the front cover (front panel) 166 is attached to a relay box 316 that relays the signal from the secondary plug 22 and transmits it to the control board 18 and the like, and the resistor 312 is housed in the relay box 316 Can also be adopted.

  When the above configuration is adopted, the electromagnetically operated switchgear can be used as it is when the relay is a digital relay, and can be handled by attaching a relay box 316 when the relay is an analog relay. Either of the digital relay and the analog relay can be used. It can be shared with other relays.

  The relay box 316 does not need to be directly attached to the switchgear, and may be anywhere between the analog relay and the switchgear.

  In the above embodiment, the circuit breaker 32 provided for one phase has been described. However, the circuit breaker 32 can be provided for three phases, and by connecting the circuit breakers of each phase via the shaft 98, Using a single electromagnet 14, the circuit breakers of each phase can be shut off and turned on.

  Alternatively, the circuit breaker 32 may be operated by connecting a plurality of electromagnets 14 via the shaft 98 and connecting the coils 48 of the electromagnets 14 in series.

It is a front view of an electromagnetic operating device. It is a side view of an electromagnetically operated switchgear. It is a figure for demonstrating the operation | movement at the time of injection | throwing-in of a state detection mechanism. It is a figure for demonstrating the operation | movement at the time of interruption | blocking of a state detection mechanism. (A) is a side view for demonstrating the state before an interlock rod lift, (b) is a principal part front view. (A) is a side view for demonstrating the state after an interlock rod lift, (b) is a principal part front view. (A) is a side view for demonstrating a state when an interlock rod cannot be lifted, (b) is a principal part front view. (A) is a side view for demonstrating manual switching operation when a front cover is attached, (b) is a principal part front view. (A) is a side view for explaining a manual insertion operation when the front cover is removed, (b) is a front view of a main part, and (c) is a top view of a handle used for the manual insertion operation. is there. It is a block block diagram for demonstrating the circuit structure of an electromagnet control apparatus. It is a circuit block diagram of a charging circuit. It is a figure for demonstrating the hysteresis characteristic of a charge completion detection circuit. It is a characteristic view for demonstrating CO operation | movement of a circuit breaker. It is a figure for demonstrating O operation | movement and CO operation | movement of a circuit breaker. It is a characteristic view for demonstrating the relationship between a capacitor | condenser charge voltage and capacitor | condenser charge energy. It is a block diagram for demonstrating the circuit structure of a control logic part. It is a time chart for demonstrating operation | movement of the control logic part at the time of injection | throwing-in operation | movement. It is a time chart for demonstrating operation | movement of the control logic part at the time of interruption | blocking operation | movement. It is a block block diagram which shows other embodiment of an electromagnet control apparatus. (A), (b) is a circuit block diagram for demonstrating the operation principle of an overcurrent relay. It is a block block diagram which shows embodiment when the resistance for bypass is arrange | positioned at the electromagnetically operated switchgear. It is a perspective view when a relay box is provided in the electromagnetically operated switchgear. It is a circuit block diagram when a relay box is connected to the electromagnetically operated switchgear.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Case 14 Electromagnet 16 Capacitor 18 Control board 32 Vacuum circuit breaker 34 Auxiliary contact 36 Display board 38 Counter 48 Coil 58 Movable iron core 60 Fixed iron core 62 Shaft 200 AC / DC converter 202 Charging circuit 204 Control logic part 206 Discharge circuit 208 FET
210, 212 Relay contact 218 FET
220 Charging completion detection circuit 224 to 230 Relay contact 300 Circuit breaker 302 Current transformer 306 Main contact 308 Auxiliary contactor 310 Display 312 Resistance 314 Auxiliary contact 316 Relay box

Claims (2)

An electromagnet having a coil that separates or contacts the movable iron core and the fixed iron core according to a movable iron core and a stationary iron core and electromagnetic force arranged opposite to each other; a capacitor that stores electric power for exciting the electromagnet coil; A control board that controls the energization direction of the current supplied from the capacitor to the electromagnet coil in response to a closing command or an opening command for the switch, and a drive associated with the electromagnetic force generated from the electromagnet connected to the movable core A shaft that transmits force to the switch via a link mechanism, a case in which the electromagnet, the capacitor, the control board and the shaft are housed and run on a mounting base and can be pulled out; The case is prevented from being pulled out when inserted into a recess provided in the mounting base, and the case is lifted up when it is lifted up. And interlock rod lead formed by possible formation of the provided by pressing the upper portion of the interlocking rod, inter contacts biased by a spring in response to upward movement of the interlock rod is turned off An electromagnetic operating device comprising: a lock switch, wherein when the interlock rod is lifted and the interlock switch is turned off , an input command input to the control board is forcibly cut off.   The electromagnetic operating device according to claim 1, wherein a lock pin fixed to the interlock rod and moved up and down together with the interlock rod, and a stopper pin arranged in a lift region of the lock pin and fixed to the link mechanism are provided. The electromagnetic operating device is characterized in that when the switch is in the on state, the interlock rod is prevented from ascending by contact between the lock pin and the stopper pin.

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