JP2019096575A - Vacuum circuit breaker - Google Patents

Abstract

To provide a vacuum circuit-breaker capable of performing a breaking and input operation by operating an electromagnetic operation device without a control substrate and a power supply capacitor.SOLUTION: A vacuum circuit breaker comprises: a vacuum valve having a switch part in an inner part in order to solve the above problem; an electromagnetic operation device for performing a switching operation of the switching part of the vacuum valve; and a link mechanism connecting the electromagnetic operation device and the vacuum valve. The vacuum circuit breaker comprises at least an auxiliary switch for detecting a state of the switching part of the vacuum valve, and has a structure that an electromagnet coil of the electromagnetic operation device is directly energized from an external power supply. The auxiliary switch is operated so as to be rotated in the co-axis, and an auxiliary contact point for an energized current control of the electromagnet coil is provided separated from the auxiliary contact point for a state detection of detecting the state of the switching part of the vacuum valve. A direction of a current flowing in the electromagnet coil is changed with auxiliary switch.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a vacuum circuit breaker, and more particularly, to a vacuum circuit breaker suitable for connecting an electromagnetic control device and a vacuum valve by a link mechanism and interrupting or closing a switch.

  Generally, in the operation of a vacuum circuit breaker which is one of the switches, an electromagnetic control device using an electromagnet is used.

  As a prior art document of the vacuum circuit breaker operated by such an electromagnetic control apparatus, patent document 1 can be mentioned.

  According to Patent Document 1, an electromagnet coil for forming an electromagnet, a power supply capacitor for storing energy for exciting the electromagnet coil, and an electromagnet coil according to a closing command or opening command to a switching part of a vacuum circuit breaker. And the control board for making the power supply capacitor conductive, control by the relay contact in the control board, change the direction of the current flowing to the electromagnet coil, and perform the closing and closing operations of the switching part of the vacuum circuit breaker Is described.

  And in the vacuum circuit breaker which carries the electromagnetic operating device of patent documents 1, the link mechanism which connects an electromagnetic operating device and a vacuum valve (opening and closing part) is adopted, and in vacuum circuit breaker, closing of an opening and closing part The contact pressure spring for applying contact force to the contact point in the state and the tripping spring for opening the contact point are stored, and in the opening operation, the contact point is opened using stored energy of both springs. I am doing it.

Unexamined-Japanese-Patent No. 2004-247093

  However, in the above-described electromagnetic operating device, the reliability can be improved by eliminating the control substrate which tends to fail, but when the control substrate is eliminated, it becomes impossible to change the control of the power supply capacitor and the direction of the current flowing in the electromagnet coil. There is a risk that it will not be possible to shut off and close the vacuum circuit breaker switching part.

  The present invention has been made in view of the above-described point, and an object of the present invention is to provide a vacuum circuit breaker which can operate the electromagnetic operating device to perform the shutoff and closing operation even without the control substrate and the power supply capacitor. It is to do.

  In order to achieve the above object, the vacuum circuit breaker according to the present invention comprises a vacuum valve having an open / close portion inside, an electromagnetic operation device for opening / closing operation of the open / close portion of the vacuum valve, the electromagnetic operation device and the vacuum valve. The electromagnetic operating device includes an electromagnetic operating device-side rod connected to a movable iron core moving up and down in the vertical direction, an electromagnetic coil operating the movable iron core, and a path of a magnetic field generated from the electromagnetic coil And a permanent magnet for generating an electromagnetic force for holding the movable core, the vacuum circuit breaker comprising an auxiliary switch for detecting at least the state of the opening / closing portion of the vacuum valve, The auxiliary switch is configured to be directly excited from an external power supply, and the auxiliary switch rotates coaxially and operates, and an auxiliary contact for detecting a state of the opening / closing portion of the vacuum valve Separately, an auxiliary contact for exciting current control of the electromagnet coil is provided, and controlling the direction of current flowing through the electromagnetic coil in the auxiliary switch.

  According to the present invention, it is possible to obtain a vacuum circuit breaker that can operate the electromagnetic operating device to perform the shutoff and closing operations without the control substrate and the power supply capacitor.

It is a side view which shows schematic structure of Example 1 of the vacuum circuit breaker of this invention. It is a figure which shows the auxiliary switch used for Example 1 of the vacuum circuit breaker of this invention. It is a figure which shows the on (on) position of the auxiliary contact in Example 1 of the vacuum circuit breaker of this invention. It is a figure which shows the OFF position of the auxiliary contact in Example 1 of the vacuum circuit breaker of this invention. It is a figure which shows the excitation circuit structure of the electromagnetic control apparatus at the time of the closing operation | movement in Example 1 of the vacuum circuit breaker of this invention. It is a figure which shows the excitation circuit structure of the electromagnetic control apparatus at the time of the interruption | blocking operation | movement in Example 1 of the vacuum circuit breaker of this invention. It is a time chart which shows the operation state in Example 1 of the vacuum circuit breaker of the present invention.

  Hereinafter, the vacuum circuit breaker of the present invention will be described based on the illustrated embodiment. In the drawings, the same reference numerals are used for the same components.

  FIG. 1 shows an electromagnetic control type vacuum circuit breaker 50 as a first embodiment of a vacuum circuit breaker according to the present invention.

  The electromagnetic operation type vacuum circuit breaker 50 of the present embodiment shown in the figure includes a vacuum valve 15 having an opening / closing portion inside, an electromagnetic operation device 1 for opening / closing operation of the opening / closing portion of the vacuum valve 15, and an electromagnetic operation device 1 It is comprised roughly from the link mechanism 9 which connects the vacuum valve 15.

  The electromagnetic operating device 1 mainly comprises an electromagnetic operating device side rod 3 and a movable flat plate 4, an electromagnetic coil 5, and a permanent magnet 6 connected to a movable iron core 2 which is vertically moved up and down. It is connected to the first lever 10 via a mechanism 9.

  Further, when the exciting current is supplied to the electromagnet coil 5, the movable iron core 2 is lowered, and when the rod 3 on the electromagnetic operating device connected to the movable iron core 2 is lowered, the second lever 11 is rotated to connect parts 13 and the vacuum valve side rod 14 ascend, and contacts (opening and closing parts) provided in the vacuum valve 15 come into contact.

  In the closing operation of the electromagnetically operated vacuum circuit breaker 50, the contact pressure spring 16 and the tripping spring 17 are compressed, elastic energy is stored, and the elastic energy performs the interruption operation. When the open / close portion of the vacuum valve 15 is in the on state, the movable iron core 2 and the movable flat plate 4 are held by the attraction force of the permanent magnet 6.

  In the interruption operation of the electromagnetic operation type vacuum circuit breaker 50, a current in the opposite direction to the closing operation is supplied to the electromagnet coil 5, so that a magnetic flux is generated in the direction to cancel the attractive force of the permanent magnet 6, The release of the elastic energy stored in the disengaging spring 17 causes the rod 3 on the electromagnetic control device to ascend, and the contacts provided in the vacuum valve 15 contact and separate.

  When the electromagnetic actuator side rod 3 is raised, the shaft 21 moves upward, and the third lever 22 rotates in accordance with the movement of the shaft 21. The third lever 22 and the auxiliary switch 23 interlock with each other, and the auxiliary switch 23 also serves to detect the state of the opening / closing portion of the vacuum valve 15 and to control the current flowing to the electromagnet coil 5. In the entering operation, the fourth lever 25 rotates counterclockwise around the pin 26 and moves to a position where the "on" character of the display plate 24 can be seen from the front side.

  Furthermore, as the spring 27 is contracted and the counter lever 28 rotates about 45 degrees around the pin 29, the counter 30 counts that the opening and closing part of the vacuum valve 15 has operated once.

  Next, the configuration of the auxiliary switch 23 will be described with reference to FIGS. 2, 3 and 4.

  As shown in FIG. 2, the auxiliary switch 23 includes a first auxiliary contact 32 for state monitoring, a second auxiliary contact 33 for state monitoring, a third auxiliary contact 34 for state monitoring, and a fourth auxiliary contact for state monitoring. 35, a first excitation current control auxiliary contact 36, a second excitation current control auxiliary contact 37, a third excitation current control auxiliary contact 38, and a fourth excitation current control auxiliary contact 39 The rotation of the shaft 31 turns all auxiliary contacts into "on" or "off".

  As shown in FIGS. 3 and 4, the first state monitoring auxiliary contact 32, the second state monitoring auxiliary contact 33, the third state monitoring auxiliary contact 34, and the fourth state monitoring auxiliary contact 35, The first excitation current control auxiliary contact 36, the second excitation current control auxiliary contact 37, the third excitation current control auxiliary contact 38, and the fourth excitation current control auxiliary contact 39 are centered on the shaft 31. A rotating contact 42, and a first stator 40 and a second stator 41, which are brought into contact (state of FIG. 3) or disengaged (state of FIG. 4) by rotation of the contact 42, While the contactor 42 is in contact with the first stator 40 and the second stator 41, power is supplied. Therefore, by changing the circumferential width of the contact 42, it is possible to control the energization time.

  FIG. 5 shows the excitation circuit configuration of the electromagnetic operating device 1 at the time of closing operation in the first embodiment of the electromagnetic operation type vacuum circuit breaker 50 of the present invention, and FIG. 6 shows the embodiment of the electromagnetic operation type vacuum circuit breaker 50 of the present invention The excitation circuit structure of the electromagnetic operating device 1 at the time of the interruption | blocking operation | movement in 1 is shown, respectively.

  As shown in FIG. 5, in the present embodiment, since there is no power supply capacitor, the electromagnet coil 5 is directly excited from the external power supply 43. For the second and fourth excitation current control with the first and third excitation current control auxiliary contacts 36 and 38 turned off. When the auxiliary contacts 37 and 39 are on (on), a current flows from the bottom to the top of the electromagnet coil 5 so as to be excited, and the electromagnetic control type vacuum circuit breaker 50 performs the closing operation.

  Further, as shown in FIG. 6, a command (OFF) 45 is input from the control device outside the electromagnetic control type vacuum breaker 50, and the first and third excitation current control auxiliary contacts 36 and 38 are input (ON And when the second and fourth excitation current control auxiliary contacts 37 and 39 are off, the current flows from the top to the bottom of the electromagnet coil 5 to be excited. Is the shutoff operation.

  Next, the operation state in the embodiment 1 of the electromagnetic control type vacuum circuit breaker 50 of the present invention will be described with reference to FIG. First, the charging operation will be described.

  As shown in FIG. 7, with the second state monitoring auxiliary contact 33 and the second excitation current control auxiliary contact 37 turned on, the electromagnetic control type vacuum circuit breaker 50 enters the command from the outside (on) When 44 is entered, the electromagnetic control device 1 starts the closing operation. The second state monitoring auxiliary contact 33 is turned off when the electromagnetic operation device 1 enters the closing operation.

  Also, when the second excitation current control auxiliary contact 37 is turned on (on), the electromagnet coil 5 is excited and the closing operation continues. The second excitation current control auxiliary contact 37 is turned on until immediately before the electromagnetic control device 1 is turned on.

  Next, the blocking state will be described.

  As shown in FIG. 7, with the first state monitoring auxiliary contact 32 and the first excitation current control auxiliary contact 36 turned on, the external control device of the electromagnetic control type vacuum breaker 50 is turned off ( off) When the command 45 is input, the electromagnetic control device 1 starts the shutoff operation. The second state monitoring auxiliary contact 33 is turned off when the electromagnetic operation device 1 enters the shutoff operation. When the first excitation current control auxiliary contact 36 is turned on (on), the electromagnet coil 5 is excited and the interruption operation continues. The first excitation current control auxiliary contact 36 is turned on until immediately before the electromagnetic operation device 1 is turned off.

  A short circuit can be prevented by switching on and off so that the first excitation current control auxiliary contact 36 and the second excitation current control auxiliary contact 37 do not simultaneously turn on. .

  In addition, in order to prevent the short circuit of the auxiliary switch 23, in the case of the turning operation or turning on operation, the relay is turned on / off by the signal from the power supply voltage, and the shorting can not be used. If it is possible to prevent the short circuit, it is possible to prevent short circuit by feeding back the signal from the auxiliary contact to the relay and switching the relay on and off to make it impossible to use the special contact which is not in use. .

  According to the configuration of the present embodiment, it is possible to operate the electromagnetic operating device 1 to perform the interruption and closing operations of the electromagnetic operation type vacuum circuit breaker 50 even without the control substrate and the power source capacitor.

  The present invention is not limited to the embodiments described above, but includes various modifications. For example, the embodiments described above are described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described. Also, part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. In addition, with respect to a part of the configuration of each embodiment, it is possible to add, delete, and replace other configurations.

  DESCRIPTION OF SYMBOLS 1 ... electromagnetic operating device, 2 ... movable iron core, 3 ... electromagnetic operating device side rod, 4 ... movable flat plate, 5 ... electromagnet coil, 6 ... permanent magnet, 7 ... pin, 8 ... connection components, 9 ... link mechanism, 10 ... 1st lever 11 11 2nd lever 13 connection part 14 vacuum valve side rod 15 vacuum valve 16 contact pressure spring 17 pull-off spring 21 shaft 22 third Lever, 23 ... auxiliary switch, 24 ... display board, 25 ... fourth lever, 26 ... pin, 27 ... spring, 28 ... counter lever, 29 ... pin, 30 ... counter, 31 ... axis, 32 ... first state Auxiliary contact for monitoring, 33: second auxiliary contact for status monitoring, 34: third auxiliary contact for status monitoring, 35: fourth auxiliary contact for status monitoring, 36: first auxiliary contact for excitation current control, 37 ··· second auxiliary contact for excitation current control, 38 ··· third Auxiliary contacts for magnetic current control, 39: fourth auxiliary contacts for excitation current control, 40: first stator, 41: second stator, 42: contacts, 43: external power supply, 44: ON (on ) Command, 45: off command, 50: electromagnetic control type vacuum circuit breaker.

Claims (5)

A vacuum valve having an open / close portion inside, an electromagnetic operation device for opening / closing operation of the open / close portion of the vacuum valve, and a link mechanism connecting the electromagnetic operation device and the vacuum valve;
The electromagnetic operating device forms an electromagnetic operating device side rod connected to a movable iron core which moves up and down in the vertical direction, an electromagnet coil which operates the movable iron core, and a path of a magnetic field generated from the electromagnet coil. A vacuum magnet having an auxiliary switch for detecting a state of at least the opening / closing portion of the vacuum valve, comprising a permanent magnet for generating an electromagnetic force for holding
The electromagnet coil is configured to be excited directly from an external power supply, and the auxiliary switch rotates coaxially to operate, and separately from an auxiliary contact for detecting a state of the opening / closing portion of the vacuum valve, An auxiliary contact for excitation current control is provided, and the direction of the current flowing through the electromagnet coil is controlled by the auxiliary switch. In the vacuum circuit breaker according to claim 1,
The vacuum circuit breaker characterized in that the auxiliary contact for detecting the state and the auxiliary contact for controlling the excitation current consist of a plurality, and all the auxiliary contacts are turned on or off when the shaft rotates. The vacuum circuit breaker according to claim 1 or 2
The auxiliary contact for detecting the state and the auxiliary contact for controlling the exciting current include a contact rotating around an axis and a stator contacting or separated by the rotation of the contact.
A vacuum circuit breaker characterized in that electricity is supplied while the contactor and the stator are in contact with each other. In the vacuum circuit breaker according to claim 2 or 3,
The auxiliary contact for detecting the state and the auxiliary contact for controlling the exciting current each include first to fourth auxiliary contacts for detecting the state and an auxiliary contact for controlling the exciting current.
When the first and third excitation current control auxiliary contacts are off and the second and fourth excitation current control auxiliary contacts are on, the vacuum circuit breaker is closed.
When the first and third excitation current control auxiliary contacts are on and the second and fourth excitation current control auxiliary contacts are off, the vacuum circuit breaker operates to shut off. Vacuum circuit breaker. In the vacuum circuit breaker according to claim 2 or 3,
The auxiliary contact for detecting the state and the auxiliary contact for controlling the exciting current each include first to fourth auxiliary contacts for detecting the state and an auxiliary contact for controlling the exciting current.
When an on command is input from the outside of the vacuum circuit breaker with the second auxiliary contact for state monitoring and the second auxiliary contact for excitation current control on, the electromagnetic operating device starts the closing operation. The second auxiliary contact for status monitoring is turned off when the electromagnetic operating device enters the closing operation, and the electromagnetic coil is excited and closed when the second auxiliary contact for excitation current control is on. Operation continues, and the second auxiliary contact for excitation current control is turned on by just before the electromagnetic control device is turned on,
When an off command is input from the outside of the vacuum circuit breaker with the first auxiliary contact for status monitoring and the first auxiliary contact for excitation current control on, the electromagnetic operating device starts the interrupting operation. At the same time, the auxiliary contact for monitoring the second state is turned off when the electromagnetic operating device enters the disconnection operation, and the electromagnetic coil is excited and disconnected when the auxiliary contact for controlling the first excitation current is on. The vacuum circuit breaker characterized in that the operation continues and the auxiliary contact for controlling the first excitation current is turned on by the time immediately before the electromagnetic operating device is turned off.

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