JP2018010719A - Switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a switching device capable of braking a movable coil by a simple structure.SOLUTION: A switching device comprises two coil pairs in an operation mechanism. Each of the coil pairs is made up of a fixed coil and a movable coil which open and close a switch part by moving a movable shaft by electromagnetic repulsive force when energized by power sources. The two coil pairs are separated into: a fixed coil discharge circuit in which the fixed coils are connected in series; and a movable coil discharge circuit in which the movable coils are connected in series. The power sources are respectively provided in the fixed coil discharge circuit and the movable coil discharge circuit.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a switchgear having an electrode that can be contacted and separated, and the electrode is brought into contact / isolation so that a pair of electrodes can be opened and closed.

  Conventionally, a switch unit that can be opened and closed including a movable electrode, a movable shaft that extends from the movable electrode, a fixed coil that is energized by a power source and moves the movable shaft by an electromagnetic repulsive force, and opens and closes the switch unit and a movable An operation mechanism having a coil pair composed of coils, and a control means for controlling the opening and closing of the switch unit by controlling the current flowing through the fixed coil and the movable coil. A switchgear in which one of a fixed coil and a movable coil is provided between the other coils is known (for example, see Patent Document 1).

JP 2002-124158 A

  However, in the switchgear described in Patent Document 1, in order to brake the moving coil that moves at high speed, the closing fixed coil and the closing moving coil, or the opening fixing coil and the opening moving coil It is necessary to provide a sensor for actively adjusting the timing of exciting the signal, which causes a problem that the configuration becomes complicated.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an opening / closing device that can brake a movable coil with a simple configuration.

  The switchgear according to the present invention includes a switch unit that can be opened and closed including a movable electrode, a movable shaft that extends from the movable electrode, and a switch unit that is energized by an electric power source and moves the movable shaft by electromagnetic repulsion. An operation mechanism having a coil pair composed of a fixed coil and a movable coil to be opened and closed, and a drive circuit for controlling the opening and closing of the switch unit by controlling a current flowing in the fixed coil and the movable coil. The two coil pairs are configured such that the movable coils are connected back to back via a support plate and fixed to the movable shaft together with the support plate, and the movable coil is sandwiched between the fixed coils. The pair of coil pairs is divided into a fixed coil discharge circuit in which fixed coils are connected in series and a movable coil discharge circuit in which movable coils are connected in series. In which the power source is provided for each of the conductive circuit and a moving coil discharge circuit.

According to the switchgear according to the present invention, there are two coil pairs of the operating mechanism having the fixed coil and the coil pair composed of the movable coil that are energized by the power source and move the movable shaft by the electromagnetic repulsive force to open and close the switch unit. The two coil pairs are separated into a fixed coil discharge circuit in which the fixed coils are connected in series and a movable coil discharge circuit in which the movable coils are connected in series. Each circuit is provided with a power source.
Therefore, the movable coil can be braked with a simple configuration.

It is a schematic block diagram which shows the switchgear which concerns on Embodiment 1 of this invention. It is a connection diagram which shows the actuator drive circuit of the switchgear which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows the closing state of the switchgear which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows the time change of the pulse current in the switchgear which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows the magnetic field and electric current direction in the actuator drive circuit of the switchgear which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows the magnetic field and electric current direction in the actuator drive circuit of the switchgear which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows the closing state of the switchgear which concerns on Embodiment 2 of this invention. It is a connection diagram which shows the actuator drive circuit of the switchgear which concerns on Embodiment 3 of this invention.

  Hereinafter, preferred embodiments of a switchgear according to the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts will be described with the same reference numerals.

Embodiment 1 FIG.
1 is a schematic configuration diagram showing a switchgear according to Embodiment 1 of the present invention. In FIG. 1, a fixed electrode 1 fixed to a fixed plate 16 that is an outer plate of the switchgear can be opened or closed with a movable electrode 2 facing the fixed electrode 1. It is composed. Note that the switch unit 3 is housed in the vacuum valve 4 in order to improve the arc extinguishing performance of opening or closing.

  The fixed electrode 1 and the movable electrode 2 are respectively provided with a fixed side terminal 14 and a movable side terminal 15 to enable connection between the electric circuit and the switch unit 3. In addition, a movable shaft 5 is attached to the movable electrode 2, and an insulating rod 8 is inserted between the movable shaft 5 to maintain insulation from the outside, and the charging portion 6 is connected to the switch portion 3 side of the movable shaft 5. The opposite side is a no-charge part 7.

  An insertion plate 20 is fixed to the non-charging portion 7 of the movable shaft 5 perpendicular to the axial direction, and the opening movable coil 10a and the closing movable coil 10b are fixed to both surfaces thereof. The opening movable coil 10a and the closing movable coil 10b are also fixed to the movable shaft 5 in order to increase rigidity.

  Further, the opening fixed coil 11 is fixed to the opening coil fixing plate 17 so as to face the opening moving coil 10a, and a magnetic field is generated from the opening fixing coil 11 and the opening moving coil 10a. Occurs and interacts.

  In addition, the closing fixed coil 12 is fixed to the closing coil fixing plate 18 so as to face the closing moving coil 10b. Similarly, the closing fixed coil 12 and the closing moving coil 10b Magnetic fields are generated and interact with each other.

  Further, the movable shaft 5 is also connected to a contact pressure closing release spring 13 that holds the closing or opening of the switchgear, and the contact pressure closing release spring 13 is fixed to a spring fixing plate 19, Hold the open or closed state.

  FIG. 2 is a connection diagram showing an actuator drive circuit of the switchgear according to Embodiment 1 of the present invention. In FIG. 2, the opening movable coil 10a, the closing movable coil 10b, the opening fixed coil 11, the closing fixed coil 12 and the connection of the power source for supplying a pulse current thereto are shown in FIG. Yes.

  In FIG. 2, an actuator drive circuit 40 that controls an operation mechanism that applies a driving force to the movable shaft 5 to open and close the switch unit 3 includes an opening power storage 41a that is a power source for opening, and for closing. A closed power storage 41b, which is a power source of the semiconductor device, an opening switch 42a for opening the electrode made of a semiconductor element, and a closing switch 42b for closing the electrode made of a semiconductor element.

  Further, the actuator drive circuit 40 is connected in parallel to the opening fixed coil 11 and the closing fixed coil 12, and the diode 43a that releases electromagnetic energy accumulated in each coil, and the opening movable coil 10a and A diode 43b is connected in parallel to the closing movable coil 10b and emits electromagnetic energy accumulated in each coil.

  Here, a series circuit including a series connection of the opening fixed coil 11 and the closing fixed coil 12 is referred to as a fixed coil discharge circuit 80a, and includes a series connection of the opening movable coil 10a and the closing movable coil 10b. The series circuit is referred to as a moving coil discharge circuit 80b.

  When actually using a switchgear, as shown in FIG. 2, in order to supply power for opening or closing to the opening power storage 41a and the closing power storage 41b, A DC power supply 34 is connected.

  Thus, the switchgear according to Embodiment 1 of the present invention is energized by the switch unit 3 that can be opened and closed including the movable electrode 2, the movable shaft 5 extending from the movable electrode 2, and the DC power source 34. An operating mechanism that opens and closes the switch unit 3 by moving the movable shaft 5 by an electromagnetic repulsive force, and an actuator drive circuit 40 that controls the operating mechanism are provided.

  FIG. 3 is an explanatory diagram showing a closed state of the switchgear according to Embodiment 1 of the present invention. In FIG. 3, the operating mechanism for opening and closing the switch unit 3 includes a first coil pair 45a composed of a fixed coil for opening 11 and a movable coil for opening 10a, a fixed coil for closing 12, and a movable coil for closing. And a second coil pair 45b composed of 10b.

  In addition, the actuator drive circuit 40 causes current to flow through two pairs of coils including the opening fixed coil 11 and the opening movable coil 10a, and the closing fixed coil 12 and the closing movable coil 10b. The opening and closing of the switch unit 3 is controlled by force.

  Further, for the first coil pair 45a and the second coil pair 45b, the opening movable coil 10a and the closing movable coil 10b are provided between the opening fixed coil 11 and the closing fixed coil 12. .

  In addition, with respect to the first coil pair 45a and the second coil pair 45b, the opening movable coil 10a and the closing movable coil 10b are connected back to back via a support plate, that is, the insertion plate 20, and are inserted. 20 is fixed to the movable shaft 5, and is configured to be sandwiched between the opening fixed coil 11 and the closing fixed coil 12.

  Next, the opening operation of the switchgear according to Embodiment 1 of the present invention will be described with reference to FIGS. FIG. 4 is an explanatory diagram showing the change over time of the pulse current in the switchgear according to Embodiment 1 of the present invention, where the horizontal axis shows time and the vertical axis shows current. 5 and 6 are explanatory diagrams showing magnetic field / current directions in the actuator drive circuit of the switchgear according to Embodiment 1 of the present invention.

  When the open switch 42a and the close switch 42b are simultaneously turned on in the closed state shown in FIG. 3, as shown in FIG. 4, from the open power storage 41a and the closed power storage 41b, the open switch A pulse current flows to each coil through 42a and the closing switch 42b, and a magnetic field is generated.

  Here, in FIG. 5, the direction of current at time t = 0 to τsec in FIG. 4 is indicated by a solid arrow, and the direction of the magnetic field is indicated by a hollow arrow. In FIG. 6, the direction of current after time t = τsec in FIG. 4 is indicated by a solid arrow, and the direction of the magnetic field is indicated by a hollow arrow.

  5, at time t = 0 to τsec in FIG. 4, the coil pairs of the opening fixed coil 11 and the opening movable coil 10 a, and the closing movable coil 10 b and the closing fixed coil 12 are respectively It can be seen that the repulsive force and the attractive force are generated by the interaction of the generated magnetic fields, respectively, and the opening movable coil 10a is pulled down in the downward direction in the drawing.

  Further, from FIG. 6, after the time t = τsec in FIG. 4, the energizing direction of the pulse current flowing through the opening movable coil 10a and the closing movable coil 10b is switched to the negative direction. It can be seen that the magnetic fields generated by the pole moving coil 10a and the closing movable coil 10b are also opposite to the time t = 0 to τsec.

  For this reason, the repulsive force and the attractive force acting on the opening movable coil 10a and the closing movable coil 10b are also reversed, and the force acting on the movable shaft 5 acts as a direction in which the switch unit 3 is turned on, that is, as a braking force. It will be.

  When the pulse current is not supplied, the electromagnetic energy accumulated in the opening fixed coil 11, the opening movable coil 10a, the closing movable coil 10b, and the closing fixed coil 12 is changed to the diode 43a, Each coil circulates through 43b and gradually attenuates.

  In this way, the driving force in the opening direction acting on the opening moving coil 10a and the closing moving coil 10b is switched to the driving force in the closing direction, that is, the braking force after time t = τsec. This reduces the displacement speed of the movable shaft 5 including the opening movable coil 10a and the closing movable coil 10b at the opening extreme of the switch unit 3, and alleviates the impact force generated when the switch unit 3 is opened. can do.

  Note that it is preferable that the momentum of the movable shaft 5 including the opening movable coil 10a and the closing movable coil 10b be zero at the open extreme of the switch unit 3. Therefore, it is conceivable to adjust the ratio between the driving force in the opening direction acting on the opening movable coil 10a and the closing movable coil 10b and the driving force in the closing direction, that is, the braking force.

  Specifically, the coil parameters such as the number of turns, the winding diameter, the inner diameter, and the outer diameter of the opening fixed coil 11, the closing fixed coil 12, the opening movable coil 10a, and the closing movable coil 10b are adjusted. Is mentioned.

  Thus, the time width and amplitude of the current flowing through the opening fixed coil 11, the closing fixed coil 12, the opening movable coil 10a, and the closing movable coil 10b, the opening movable coil 10a, and the closing movable The timing at which the direction of the current flowing through the coil 10b is reversed can be changed, or the movable region of the opening movable coil 10a, the closing movable coil 10b, and the movable shaft 5 can be changed.

  Further, the total inductance L1 of the fixed coil discharge circuit 80a including the opening fixed coil 11 and the closing fixed coil 12 and the entire movable coil discharge circuit 80b including the opening movable coil 10a and the closing movable coil 10b are all included. The ratio with the inductance L2 is about 1: 2, and at time t = τsec, that is, when the electromagnetic force acting on the movable shaft 5 is switched from the driving force in the opening direction to the braking force, the movable shaft 5 has a full stroke. You may make it come to a midpoint.

  According to this configuration, the driving force in the opening direction in the first half and the driving force in the closing direction in the second half, that is, the braking force, are equally applied to the movable shaft 5. The momentum of the shaft 5 can be made zero.

  Further, the total inductance L1 of the fixed coil discharge circuit 80a including the opening fixed coil 11 and the closing fixed coil 12 and the entire movable coil discharge circuit 80b including the opening movable coil 10a and the closing movable coil 10b are all included. The ratio with the inductance L2 may be about 1: 1.8, and the movable shaft 5 may be at the midpoint of the entire stroke at time t = τsec as described above.

  According to this configuration, the driving force in the opening direction can be increased relative to the driving force in the closing direction, that is, the braking force, and the opening speed of the switch unit 3 can be increased. At this time, the momentum of the movable shaft 5 at the open extreme cannot be made zero.

  However, for example, by combining with an oil-type shock absorber or the like, the movable shaft 5 can be made stationary by reducing the impact. In addition, since the speed of the movable shaft 5 is sufficiently reduced by the braking force generated by the electromagnetic force, the shock absorber can have a small speed rating.

  In addition, for the purpose of reversing the electromagnetic force acting on the movable shaft 5, the direction in which the pulse current is applied is not limited to passing through the opening movable coil 10a and the closing movable coil 10b. It may pass through the fixed coil 11 for opening and the fixed coil 12 for closing.

As described above, according to the first embodiment, the coil of the operating mechanism having the coil pair including the fixed coil and the movable coil that are energized by the power source and move the movable shaft by the electromagnetic repulsive force to open and close the switch unit. There are two pairs, and the two pairs of coils are separated into a fixed coil discharge circuit in which fixed coils are connected in series and a movable coil discharge circuit in which movable coils are connected in series. A power source is provided in each of the moving coil discharge circuits.
Therefore, the movable coil can be braked with a simple configuration.

Embodiment 2. FIG.
FIG. 7 is an explanatory view showing a closed state of the switchgear according to Embodiment 2 of the present invention. In FIG. 7, a magnetic body 60 for concentrating magnetic flux is incorporated in at least one of the opening movable coil 10a, the closing movable coil 10b, the opening fixed coil 11, and the closing fixed coil 12.

  According to this configuration, the circuit inductance can be finely adjusted. Specifically, the ratio between the driving force in the opening direction acting on the movable shaft 5 and the driving force in the closing direction, that is, the braking force can be easily adjusted. This configuration is applied in combination with the configuration of the first embodiment.

Embodiment 3 FIG.
FIG. 8 is a connection diagram showing an actuator drive circuit of the switchgear according to Embodiment 3 of the present invention. In FIG. 8, impedance adjustment mechanisms 70a and 70b including at least one of a resistance element, an inductive element, and a capacitive element are connected in series to the fixed coil discharge circuit 80a and the movable coil discharge circuit 80b. The impedance adjustment mechanism may be connected to only one of the fixed coil discharge circuit 80a and the movable coil discharge circuit 80b.

  According to this configuration, the total impedance of the circuit can be finely adjusted. Specifically, the ratio between the driving force in the opening direction acting on the movable shaft 5 and the driving force in the closing direction, that is, the braking force can be easily adjusted. This configuration is applied in combination with the configuration of the first embodiment, but may be applied in combination with the configuration of the second embodiment.

  DESCRIPTION OF SYMBOLS 1 Fixed electrode, 2 Movable electrode, 3 Switch part, 4 Vacuum valve, 5 Movable shaft, 6 Charging part, 7 Uncharged part, 8 Insulating rod, 10a Opening movable coil, 10b Closing movable coil, 11 Opening Fixed coil, 12 Closed fixed coil, 14 Fixed terminal, 15 Movable terminal, 16 Fixed plate, 17 Opened coil fixed plate, 18 Closed coil fixed plate, 19 Fixed plate, 20 Interposal plate, 34 DC Power supply, 40 Actuator drive circuit, 41a Open power storage, 41b Closed power storage, 42a Open switch, 42b Close switch, 43a, 43b Diode, 45a First coil pair, 45b Second coil pair, 60 Magnetic Body, 70a impedance adjustment mechanism, 80b movable coil discharge circuit, 80a fixed coil discharge circuit.

Claims (6)

A switch part that can be opened and closed including a movable electrode;
A movable shaft extending from the movable electrode;
An operating mechanism having a coil pair consisting of a stationary coil and a movable coil that is energized by a power source and moves the movable shaft by electromagnetic repulsive force to open and close the switch unit;
A drive circuit that controls the opening and closing of the switch unit by controlling the current flowing through the fixed coil and the movable coil,
There are two pairs of coils of the operating mechanism,
The two coil pairs are configured such that the movable coils are connected back to back via a support plate and fixed to the movable shaft together with the support plate, and the movable coil is sandwiched between the fixed coils. ,
The two pairs of coils are separated into a fixed coil discharge circuit in which the fixed coils are connected in series and a movable coil discharge circuit in which the movable coils are connected in series, and the fixed coil discharge circuit and the movable coil A switchgear in which the power source is provided in each of the discharge circuits. The total impedance of the fixed coil discharge circuit and the total impedance of the movable coil discharge circuit are the momentum in the contact moving direction applied to the movable electrode of the switch unit when a current flows through the fixed coil and the movable coil. The opening / closing device according to claim 1, wherein absolute values of the momentum and the momentum in the opposite direction are adjusted to be equal to each other. The switchgear according to claim 1 or 2, wherein a ratio between a total inductance of the fixed coil discharge circuit and a total inductance of the movable coil discharge circuit is 1: 1.8. The switchgear according to claim 1 or 2, wherein a ratio of a total inductance of the fixed coil discharge circuit to a total inductance of the movable coil discharge circuit is 1: 2. The switchgear according to any one of claims 1 to 4, wherein an inductance adjusting magnetic body is provided in at least one of the two pairs of coils. The impedance adjustment mechanism including at least one of a resistance element, an inductive element, and a capacitive element is connected in series to at least one of the fixed coil discharge circuit and the movable coil discharge circuit. The switchgear according to item 1.

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