JP2003016887A - Operating device for power switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an operating device for power switchgear, capable of enhancing the reliability of opening and closing operation and reducing the number of part items, by eliminating the demagnetization of a permanent magnet in the current-carrying to opening and closing coils, and opening and closing vacuum valves corresponding to three phase by three movable iron cores integrated to one fixed iron core. SOLUTION: Three movable iron cores 22 is housed in one fixed iron core 21. Each iron movable coil 22 comprises a closing coil 24, wound on the closing side and an opening coil 25 wound on the opening side, and the permanent magnets 26 are arranged opposite to each other through each movable iron core 22, with the magnetization directions in reverse. The magnetic flux directions carried to the permanent magnet 26 in the current-carrying to the closing and opening coils 24 and 25, agrees with the magnetization direction A of the permanent magnet 26.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operating device for a power switchgear, and more particularly to an operating device for a vacuum valve which constitutes a circuit breaker or a disconnector thereof.

[0002]

2. Description of the Related Art FIG. 12 shows, for example, Japanese Patent Laid-Open No. 2000-2686.
It is a schematic cross section which shows the operating device of the conventional switchgear for electric power described in 83 publication, (a) of FIG. 12 shows the closed state of a vacuum valve, (b) of FIG. 12 opens a vacuum valve. It shows the state. FIG. 13 is a diagram for explaining the opening operation of the operating device for the conventional power switchgear shown in FIG. 12, and FIG. 14 is a diagram for explaining the closing operation of the operating device for the conventional power switchgear shown in FIG.

In FIG. 12, an operating device 1 operates a vacuum valve 2, for example, a vacuum circuit breaker, which is constructed by arranging a movable contact 2a and a fixed contact 2b in a vacuum container 2c so that they can come into contact with and separate from each other. The operating rod 3 is a movable contactor 2.
It is fixed to a and is held so as to be movable in the direction (vertical direction in the drawing) for moving the movable contactor 2a to and from the fixed contactor 2b.

The movable member 4 has a hat-shaped cross section,
It is connected to the operation rod 3 so as to be relatively movable, and is held by a fixing member 5 having a cup-shaped cross section so as to be movable in the vertical direction in the figure. The first elastic member 6 is interposed between the operating rod 3 and the movable member 4, and the moving contact 2 is attached to the movable member 4.
In the direction in which a is pressed against the fixed contactor 2b, the operation rod 3
Is urged. A disk-shaped permanent magnet 7 for attracting and driving the movable member 4 with respect to the fixed member 5 is fixed.
The permanent magnet 7 is magnetized to have N poles and S poles, respectively, on opposite end faces in the axial direction.

Here, the movable contactor 2a is replaced by the fixed contactor 2b.
When the vacuum valve 2 is in contact with the
As shown in (a) of 2, the closing member 5 is attracted by the traffic 8a, 8b of the magnetic path of the NS dipole of the permanent magnet 7 in the direction of pressing the movable contact 2a against the fixed contact 2b. The side magnetic circuit 8 is formed. On the other hand, the movable contact 2
In the state where a is separated from the fixed contactor 2b and the vacuum valve 2 is opened, the movable contactor 2a is separated from the fixed contactor 2b with respect to the fixed member 5 as shown in FIG. 12 (b). In the direction, an open side magnetic circuit 9 is formed that attracts at any one pole side 9a of the NS two poles of the permanent magnet 7.

The operating electromagnet winding 10 is fixed to the movable member 4, and the operating electromagnet constituted by the movable member 4 and the operating electromagnet winding 10 causes the magnetic flux of the closing side magnetic circuit 8 and the opening side magnetic circuit 9 to flow. It is designed to increase or decrease. Further, a second elastic member 11 is provided to urge the movable member 4 against the fixed member 5 in a direction in which the movable contact 2a is separated from the fixed contact 2b.

Next, the opening operation of the vacuum valve 2 by the conventional operating device 1 thus constructed will be described with reference to FIG. When the vacuum valve 2 is in the closing state, a current is passed through the operating electromagnet winding 10 to repel the magnetic flux of the permanent magnet 7 flowing in the closing side magnetic circuit 8 as shown by the dotted line in FIG. Generates magnetic flux.
As a result, the magnetic flux of the permanent magnet 7 flowing through the closing magnetic circuit 8 is canceled by the magnetic flux generated by the operating electromagnet winding 10, and the magnetic force of the permanent magnet 7 is reduced. Therefore, the first and second elastic members 6 and 11 fix the movable member 4 to the fixed member 5.
On the other hand, the movable contact 2a is urged in the direction of separating from the fixed contact 2b, and the movable member 4 moves downward in (a) of FIG. When the movable member 4 reaches the lower side of the fixed member 5, the open side magnetic circuit 9 is formed as shown in FIG. 13B, and the permanent magnet 7 flowing in the open side magnetic circuit 9 is formed.
The magnetic flux generated by the operating electromagnet winding 10 is added to the magnetic flux of. As a result, the movable member 4 is magnetically attracted, and the movable contactor 2a is opened from the fixed contactor 2b.

Next, the closing operation of the vacuum valve 2 by the conventional operating device 1 will be described with reference to FIG. When the vacuum valve 2 is in the open state, a current is passed through the operating electromagnet winding 10 to repel the magnetic flux of the permanent magnet 7 flowing in the open side magnetic circuit 9 as shown by the dotted line in FIG. Generates magnetic flux. Due to the electromagnetic repulsive force at this time, the movable member 4 is moved relative to the fixed member 5 by the movable contactor 2a.
When the movable member 4 reaches the position shown in FIG. 14B, the closing side magnetic circuit 8 is formed and the permanent magnet 7 flowing in the closing side magnetic circuit 8 is urged in the direction of pressing the fixed contact 2b. The magnetic flux generated by the operating electromagnet winding 10 is added to the magnetic flux of. As a result, the movable member 4 is magnetically attracted against the forces of the first and second elastic members 6 and 11, and the movable contactor 2a is brought into contact with the fixed contactor 2b to be in the closed state.

[0009]

Since the conventional operating device is constructed as described above, the magnetic field generated by the operating electromagnet winding 10 during the closing / closing operation is a demagnetizing field for the permanent magnet 7. However, the permanent magnet 7 is demagnetized, and the reliability of the opening / closing operation is reduced. In addition, the conventional operating device is
Since it is configured to be applied to the opening / closing operation of two vacuum valves 2, it is necessary to arrange the configuration shown in FIG. 12 in three rows when configuring a three-phase power switchgear. There is also a problem that the number of parts increases.

The present invention has been made in order to solve the above problems, and three movable iron cores are incorporated into one fixed iron core, and further two coil windings and permanent magnets for opening and closing are provided for each movable iron core. Provided with an operating device for a power switchgear that can be placed one by one to eliminate demagnetization of permanent magnets and to support vacuum valves for three phases to improve the reliability of opening and closing operations and reduce the number of parts. The purpose is to do.

[0011]

In an operating device for a power switchgear according to the present invention, vacuum valves having movable contacts and fixed contacts which are provided in a vacuum container so as to be able to come into contact with and separate from each other are arranged in three rows. An operating device for the power switchgear installed,
Three insulating rods fixed to each of the movable contacts, and relatively connected to each of the insulating rods,
Made of a magnetic material with both axial end faces as electromagnetic force generating faces 3
One movable iron core and the three movable iron cores are arranged in a row in a direction orthogonal to the axial direction of the movable iron core, with the axial directions of the movable iron core being parallel to each other so as to be movable. One fixed iron core made of magnetic material housed side by side, and three elastic members interposed between the insulating rod and the movable iron core to urge the movable contactor against the fixed contactor. In the closed state of the vacuum valve, the member and the fixed iron core are arranged so as to face each other with the movable iron core interposed therebetween, and the movable contactor is in contact with the fixed contactor. A closing side magnetic circuit that magnetically attracts the movable iron core in a direction of pressing the movable contact against the fixed contact is formed, and the fixed contact is provided in the opened state of the vacuum valve in which the movable contact is separated from the fixed contact. For the iron core Three pairs of permanent magnets that form an open-side magnetic circuit that magnetically attracts the moving iron core in the direction of separating the movable contact from the fixed contact, and presses the movable contact of each of the movable iron cores against the fixed contact. Three closing coils that are wound on the side and magnetically attract the movable core to the direction in which the movable contact is pressed against the fixed contact when energized, and the movable contact of each of the movable iron cores is fixed to the fixed contact. And three opening coils that are wound on the side to be separated from each other and magnetically attract the movable iron core in the direction of separating the movable contact from the fixed contact when energized, and when energizing the closing coil and the opening coil. The generated magnetic flux is configured to flow through the permanent magnet in the magnetization direction of the permanent magnet.

Further, the arrangement direction of the movable iron cores coincides with the arrangement direction of the vacuum valves, and the movable iron cores, the elastic members and the insulating rods are linearly arranged for each of the vacuum valves. It is a thing.

The movable iron core is an I-shaped iron core in which both the electromagnetic force generating surfaces are formed as flat surfaces orthogonal to the axis.

Further, the portion of the fixed core facing the both electromagnetic force generating surfaces is formed in a convex shape.

In the movable iron core, the electromagnetic force generating surface on the closing side is formed as a flat surface orthogonal to the axis, and the electromagnetic generating surface on the opening side is flat with the flat surface orthogonal to the axis. It is an I-shaped iron core formed in a convex surface shape having a tapered surface having a predetermined angle with respect to an axis formed on the edge of the surface.

Moreover, the portion of the fixed iron core facing the electromagnetic force generating surfaces is formed in a convex shape, and the surface of the fixed iron core facing the open electromagnetic generating surface is the open electromagnetic generating surface. It is formed in a concave surface shape of an inner shape that substantially matches the outer shape of the surface.

Further, each pair of the permanent magnets is arranged so as to sandwich the movable core in a direction orthogonal to the axis of the movable core.

Further, each pair of the permanent magnets is arranged so as to sandwich the movable core in the axial direction of the movable core.

The movable iron core is a plate-shaped iron core having both electromagnetic force generating surfaces formed on a flat surface orthogonal to the axis, and a portion of the fixed iron core facing the both electromagnetic force generating surfaces is convex. A portion of the fixed core facing the side surface of the movable core is formed into a flat surface, and each pair of the permanent magnets sandwiches the movable core in a direction orthogonal to the axis of the movable core. It is attached and fixed to the flat surface of the fixed iron core.

Further, a control circuit power source is provided which can arbitrarily combine the individual drive and the simultaneous drive of the three sets of the input and release coils.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. Embodiment 1. 1 is a cross-sectional view showing the overall configuration of an operating device for a power switchgear according to Embodiment 1 of the present invention. In the figure, the same or corresponding parts as those of the conventional operating device shown in FIG. Is attached and the description thereof is omitted.

In FIG. 1, the vacuum valve 2 is constituted by arranging a movable contact 2a and a fixed contact 2b in a vacuum container 2c so that they can come into contact with and separate from each other, and functions as a vacuum circuit breaker, for example. The three vacuum valves 2 are arranged in parallel with the movable contactor 2a and the fixed contactor 2b having the contact and separation directions in parallel.

The electromagnetic operating unit 20 of the operating device 100 is formed into a rectangular parallelepiped by laminating a plurality of rectangular flat plate-like thin plates, and three movable iron core storage spaces 21a are formed in a row at a predetermined pitch. The fixed iron cores 21 are formed so that the through holes 21b make the hole center axes orthogonal to the arrangement direction of the movable iron core storage spaces 21a to communicate the movable iron core storage spaces 21a with the outside, and both end surfaces in the axial direction (electromagnetic field). A movable iron core 22 formed in an I shape (rod shape) having a force generating surface) as a flat surface orthogonal to the axial direction and housed in each movable element housing space 21a so as to be movable in the axial direction, and each movable shaft through hole 21b, and a movable shaft 23 fixed to one end surface of the movable core 22 and a conductor wire wound around the movable core 23 a predetermined number of times. Each movable core storage space 21a is surrounded by one end side of the movable core 22. Input coil arranged in 4, is constructed by turning a predetermined times to wind the wire in an annular opening coil 25 disposed in the movable iron core containing space 21a so as to surround the other end side of the movable iron core 22
And three pairs of permanent magnets 26 arranged in each movable iron core storage space 21a so as to face each other with the movable iron core 22 sandwiched between the closing coil 24 and the opening coil 25. There is.

The fixed core 21, the movable core 22 and the movable shaft 23 are made of a ferromagnetic material. And
The movable iron core 22 and the movable shaft 23 are coaxially and linearly connected. Further, the permanent magnet 26 is provided in the movable iron core storage space 21.
It is attached and fixed to the tip end surface of the convex portion 21c protruding from the side wall surface of a, and is arranged so as to have a predetermined gap with the side surface of the movable core 22 so as to form a magnetic circuit.
Further, the permanent magnets 26 are magnetized in the directions indicated by arrows A in FIG. 1, and the permanent magnets 26 of each pair are arranged so that the magnetization directions A thereof are opposite to each other.

The electromagnetic operating section 20 thus constructed is
An extension end of each movable shaft 23 from the movable shaft through hole 21b is connected to an insulating rod 27 via a wipe spring 28 as an elastic member. The movable iron core 22, the movable shaft 23,
The insulating rod 27 and the movable contact 2a are linearly connected. The insulating rod 27 is made of an electrically insulating material such as ceramic, and is used for the vacuum valve 2 and the electromagnetic operating unit 2.
It electrically insulates between 0 and the electromagnetic operation unit 20.
It has a function of transmitting the driving force of the above to the vacuum valve 2.

Here, the movable contactor 2a is replaced by the fixed contactor 2b.
1, the movable iron core 22 is located at the upper side (injection position) in FIG. 1 in the movable iron core storage space 21a. The gap between the one end surface of the movable iron core 22 in the axial direction (vacuum valve 2 side) and the upper wall surface of the movable iron core storage space 21a (inner wall surface on the vacuum valve side) is narrow, and the other end surface of the movable iron core 22 in the axial direction is Since the gap between the lower wall surface of the movable iron core storage space 21a (the inner wall surface on the side opposite to the vacuum valve) is large, the closing-side magnetic circuit 30 is formed by the permanent magnets 26 that make one turn around the closing coil 24. Then, the magnetic flux flows into the closing-side magnetic circuit 30 as indicated by the arrow in FIG. 1, and the movable iron core 22 is magnetically attracted to the fixed iron core 21 and held at the closing position, where the urging force of the wipe spring 28 is insulated. The movable contactor 2a joins the movable contactor 2a via the rod 27,
The contact pressure between the fixed contactor 2b and the fixed contactor 2b is secured.

On the other hand, when the movable contactor 2a is separated from the fixed contactor 2b and the vacuum valve 2 is open (vacuum valve 2 in the center of FIG. 1), the movable iron core 22 is drawn in the movable iron core storage space 21a. 1 is located in the lower part (open position).
The gap between the other end surface of the movable iron core 22 in the axial direction and the lower wall surface of the movable iron core storage space 21a is narrow, and the gap between the one end surface of the movable iron core 22 in the axial direction and the upper wall surface of the movable iron core storage space 21a is large. Therefore, the open-side magnetic circuit 31 is formed by the permanent magnet 26 that goes around the opening coil 25 once. Then, the magnetic flux flows into the open side magnetic circuit 31 as shown by the arrow in FIG. 1, the movable iron core 22 is magnetically attracted by the fixed iron core 21 and held in the open position, and the movable contactor 2a is separated from the fixed contactor 2b. The state where it did is secured.

Next, the operating device 1 thus constructed
The opening operation of the vacuum valve 2 by 00 will be described with reference to FIG. When the vacuum valve 2 is in the closed state, the opening coil 25 is energized to form a magnetic circuit 32 that goes around the opening coil 25 once as indicated by the alternate long and short dash line in FIG. At this time, the direction of the magnetic flux flowing through the magnetic circuit 32 changes as shown by the arrow in FIG.
6 corresponds to the magnetizing direction A. As a result, a magnetic attraction force is generated between the other end surface of the movable iron core 22 and the lower wall surface of the movable iron core storage space 21a, and this magnetic attraction force and the wipe spring 2 are generated.
The power of 8 is the movable iron core 2 by the closing side magnetic circuit 30.
The holding force of 2 is overcome, and the movable iron core 22 moves downward in FIG. When the stored force of the wipe spring 28 is released, the movable contactor 2a starts separating from the fixed contactor 2b in conjunction with the movement of the movable iron core 22. When the movable core 22 reaches the open position, the open side magnetic circuit 31 is formed as shown in FIG. Therefore, the energization of the opening coil 25 is stopped, and the movable iron core 2
2 is held in the open position by the open side magnetic circuit 31, and the movable contact 2a is in an open state separated from the fixed contact 2b.

Next, the closing operation of the vacuum valve 2 by the operating device 100 will be described with reference to FIG.
When the vacuum valve 2 is open, the closing coil 2
4 is energized to form a magnetic circuit 33 that makes one turn around the closing coil 24, as indicated by the alternate long and short dash line in FIG. At this time, the direction of the magnetic flux flowing through the magnetic circuit 33 is as shown in FIG.
As indicated by the middle arrow, it coincides with the magnetization direction A of the permanent magnet 26. As a result, a magnetic attraction force is generated between one end surface of the movable iron core 22 and the upper wall surface of the movable iron core storage space 21a, and this magnetic attraction force overcomes the holding force of the movable iron core 22 by the open side magnetic circuit 31, The movable iron core 22 moves upward in FIG. The movable contactor 2a starts approaching the fixed contactor 2b in conjunction with the movement of the movable iron core 22. The wipe spring 28 is charged after the movable contact 2a contacts the fixed contact 2b. When the movable iron core 22 reaches the closing position, the closing magnetic circuit 30 is formed as shown in FIG. Therefore, the energization of the closing coil 24 is stopped, the movable iron core 22 is held at the closing position by the closing side magnetic circuit 30, and the movable contact 2
The a state comes into contact with the fixed contactor 2b, and the closing state is established. Also,
The contact pressure between the movable contact 2a and the fixed contact 2b is secured by the urging force of the wipe spring 28.

As described above, according to the first embodiment,
During the closing / closing operation, the magnetic field generated by the opening coil 25 and the closing coil 24 does not become a demagnetizing field for the permanent magnet 26, so that there is no demagnetization of the permanent magnet 26.
The reliability of the opening / closing operation is improved. Further, since the three movable iron cores 22 are housed in the one fixed iron core 21 to configure the electromagnetic operation unit 20, the number of parts is reduced, and the cost reduction operation applicable to the power switchgear for three-phase power is realized. The device is obtained. In addition, the movable iron core 22, the movable shaft 23, the insulating rod 2
7 and the movable contactor 2a are linearly connected, the driving force of the operating device is directly transmitted to the vacuum valve 2 without using a link mechanism, and the reliability and durability of the opening / closing operation are improved. The cost can be reduced by reducing the number of parts. Further, since the movable iron core 22 is configured by an I-shaped iron core having both axial end surfaces as flat surfaces, the movable iron core 22 has a simple shape, and variation in operation among the three movable iron cores 22 is suppressed, and opening / closing operation is performed. Reliability is improved.

Now, the control circuit power source of the operating device 100 will be described with reference to FIG. Note that FIG. 4 shows the control circuit power supply for one phase for convenience of explanation. This control circuit power supply 50 includes a DC power supply 51, a capacitor 52a as an opening power storage, a capacitor 52b as a closing power storage, and an opening discharge switch 53a.
A discharge switch 53b for closing and a control device 34 for controlling the opening and closing of the discharge switch for opening and closing. Then, the control device 34 causes the discharge switch 5 for opening.
By closing 3a, the opening coil 25 is energized,
The opening operation is performed. Further, by closing the closing discharge switch 53b by the control device 34, the closing coil 2 is closed.
4 is energized and a closing operation is performed. The control circuit power supply 50 configured as described above is provided for each pair of the opening coil 25 and the closing coil 24, and the controller 34 individually opens and closes each pair of the opening and closing discharge switches 53a and 53b. By controlling, three-phase individual drive is performed. Further, the three pairs of the opening coil 25 and the closing coil 24 are connected in parallel to the control circuit power source 50 configured as described above, and the control device 34 sets the three pairs of the opening and closing discharge switches 53a and 53b. By controlling opening and closing at the same time,
Three-phase simultaneous drive is performed.

In the first embodiment described above, the capacitors 52a and 52b serving as the opening and closing power storages.
Although the control circuit power supply 50 including the
It is also possible to use only one. In this case, the circuit configuration becomes extremely simple as shown in FIG. Further, in the first embodiment, the permanent magnets 26 of each pair are arranged to face each other so that the magnetization directions A face each other. However, the permanent magnets 26 of each pair have the magnetization directions A separated from each other. May be arranged relative to. In this case, the directions of the currents supplied to the closing and opening coils 24 and 25 may be reversed from those in the first embodiment.

Embodiment 2. FIG. 6 is a cross-sectional view of an essential part showing an operating device for a power switchgear according to Embodiment 2 of the present invention, and FIG. 7 illustrates effects in the operating device for a power switchgear according to Embodiment 2 of the present invention. It is a figure.

In FIG. 6, the movable iron core 22A is formed such that one end face in the axial direction is a flat face orthogonal to the axial direction and the other end face is a flat face orthogonal to the axial direction and the outer peripheral portion of the flat face is chamfered. It is an I-shaped iron core formed in a convex shape having a formed tapered surface 35a, and an inner concave portion 36a which is substantially equal to the outer shape of the other end surface of the movable iron core 22A is movable relative to the other end surface of the movable iron core 22A. It is formed on the lower wall surface of the iron core storage space 21a. The rest of the configuration is similar to that of the first embodiment.

Here, in the first embodiment, the other end surface of the movable iron core 22 is formed into a flat surface, and the movable iron core 22 is
Since the lower wall surface of the movable iron core storage space 21a facing the other end surface of the movable iron core 22a is formed to be a flat surface, when the opening coil 25 is energized, a magnetic flux is generated as shown in FIG. Between the other end surface and the lower wall surface of the movable iron core storage space 21a. Then, the magnetic flux generated between the outer peripheral portion of the other end of the movable iron core 22 and the lower wall surface of the movable iron core storage space 21a spreads outward, which is a factor that reduces the electromagnetic force generated by the leakage component of the magnetic flux. ing.

According to the second embodiment, the movable iron core 22
An outer peripheral portion of the other end of A is formed into a chamfered taper surface 35a, and a concave portion 36a having an inner shape equivalent to the outer shape of the other end surface of the movable iron core 22A is movable on the lower wall surface of the movable iron core storage space 21a. Since it is formed so as to face the other end surface of the iron core 22A, when the opening coil 25 is energized, the magnetic flux is, as shown in FIG. 5A, the other end surface of the movable iron core 22A and the movable iron core storage space. The leakage component of the magnetic flux generated between the concave portion 21a and the concave portion 36a is reduced. Further, the area where the movable iron core 22A and the movable iron core storage space 21a face each other is wide. Therefore, when the opening coil 25 is energized, the electromagnetic force generated between the other end surface of the movable iron core 22A and the fixed iron core 21 becomes larger than that in the first embodiment, and the opening speed can be increased.

In the second embodiment, the movable iron core 2
Inner shape concave portion 36a equivalent to the outer shape of the other end surface of 2A
Is formed on the lower wall surface of the movable iron core storage space 21a, the recess 36a may be omitted and the lower wall surface of the movable iron core storage space 21a may be a flat surface. In this case, the leakage component of the magnetic flux generated between the other end surface of the movable iron core 22A and the lower wall surface of the movable iron core storage space 21a when the opening coil 25 is energized can be reduced as compared with the first embodiment, and therefore, The opening speed can be increased as compared with the first embodiment.

Embodiment 3. FIG. 8 is a cross-sectional view of essential parts showing an operating device for a power switchgear according to Embodiment 3 of the present invention. In FIG. 8, the movable iron core 22B is formed as an I-shaped iron core having both axial end surfaces as flat surfaces orthogonal to the axial direction, and protrudes from the upper and lower wall surfaces of the movable iron core storage space 21a facing the both end surfaces of the movable iron core 22B. Thus, the convex portions 37 and 38 having a flat end surface are formed. The rest of the configuration is similar to that of the first embodiment.

In the third embodiment, the movable core storage space 2 in which the convex portions 37 and 38 are opposed to both end surfaces of the movable core 22B.
Since the upper and lower wall surfaces of 1a are formed to project, the axial gap of the movable iron core 22B in the movable iron core storage space 21a becomes shorter. As a result, the axial length of the movable core 22B is shortened accordingly, and the weight of the movable core 22B is reduced. Here, the operation speed of the movable iron core is determined by F = ma (m: mass of movable part, a: acceleration, F: electromagnetic attraction force). Therefore, according to the third embodiment, the weight of the movable iron core 22B can be reduced without changing the air gap distance which becomes a large resistance in the magnetic circuit, and the opening / closing operation can be speeded up.

Fourth Embodiment In the fourth embodiment, as shown in FIG. 9, in the movable iron core 22C, one end surface in the axial direction is formed into a flat surface orthogonal to the axial direction, and the other end surface is a flat surface and a flat surface orthogonal to the axial direction. With a tapered surface 35b formed by chamfering the outer peripheral portion of
An inner concave portion 36b, which is a die core and is approximately equal to the outer shape of the other end surface of the movable iron core 22C, is formed on the tip surface of the convex portion 38a. The other configurations are the same as those in the third embodiment.

Therefore, according to the fourth embodiment, in addition to the effect of the third embodiment, the tapered surface 35b is formed on the other end surface of the movable iron core 22C and faces the other end surface of the movable iron core 22c. Since the concave portion 36b is formed on the tip surface of the convex portion 38a, a large electromagnetic force can be generated and the opening speed can be further increased.

Embodiment 5. In the fifth embodiment, as shown in FIG. 10, the permanent magnet 26 has the convex portions 37, 38.
Are arranged respectively. That is, the pair of permanent magnets 26
Are arranged to face each other in the axial direction of the movable iron core 22B with the movable iron core 22B interposed therebetween. Further, the convex portion 21c of the side wall surface of the movable iron core storage space 21a is extended to near the side surface of the movable iron core 22B so that a magnetic circuit is formed. The other configurations are the same as those in the third embodiment.

In the fifth embodiment, since the permanent magnets 26 are magnetized as shown by arrows in FIG. 10, when the movable iron core 22B is at the closing position, the permanent magnets disposed on the convex portions 37 are provided. As in the first embodiment, the magnet 26 forms a closing-side magnetic circuit that makes one round of the closing coil 24. When the movable iron core 22B is in the open position, the convex portion 3 is formed.
Similar to the first embodiment, the permanent magnets 26 disposed in the above 8 form an open side magnetic circuit that goes around the open coil 25 once. Therefore, the vacuum valve 2 can be opened and closed by energizing the opening coil 25 and the closing coil 24 as in the first embodiment. Therefore, also in the fifth embodiment, the same effect as in the third embodiment can be obtained.

In the fifth embodiment, the pair of permanent magnets 26 in the third embodiment are the movable iron core 22B.
The movable iron core 22B is arranged so as to face each other in the axial direction of the movable iron core 22B, but in the fourth embodiment, the pair of permanent magnets 26 are arranged so as to face each other in the axial direction of the movable iron core 22C across the movable iron core 22C. You may do it.

Sixth Embodiment In the sixth embodiment, as shown in FIG. 11, the side wall surface of the movable iron core storage space 21a is a flat surface, and the permanent magnet 26 is the movable iron core storage space 21a.
It is attached to the side wall surface of a and fixed so that they face each other.
The movable iron core 22D made in a flat plate shape is arranged in the permanent magnet 26 with a predetermined gap, and the convex portions 37b, 38b are provided.
Are projectingly provided on the upper and lower wall surfaces of the movable iron core storage space 21a so as to have a predetermined gap on both axial end faces of the movable iron core 22D. The other configurations are the same as those in the third embodiment.

In the sixth embodiment as well, the movable iron core 2
Since the weight of 2D is reduced, the same effect as that of the third embodiment can be obtained. According to the sixth embodiment,
Since the mounting surface of the permanent magnet 26 is a flat surface, the permanent magnet 2
6 can be easily mounted.

[0047]

Since the present invention is constituted as described above, it has the following effects.

According to the present invention, there is provided an operating device for a power switchgear in which three rows of vacuum valves having movable contacts and fixed contacts, which are provided in the vacuum container so as to be contactable and separable, are arranged in parallel. And three movable iron cores made of three insulating rods fixed to each of the movable contacts and magnetic bodies that are connected to each of the insulating rods and have both axial end faces as electromagnetic force generating faces. And the three movable iron cores are arranged so as to be movable in the axial direction of the movable iron core with the axial directions of the movable iron cores parallel to each other and arranged in one row in a direction orthogonal to the axial direction of the movable iron core. A fixed iron core made of a magnetic material, and three elastic members interposed between the insulating rod and the movable iron core to urge the movable contactor against the fixed contactor. Pair each of the movable iron cores Then, in the closed state of the vacuum valve in which the movable contactor is disposed on the fixed iron core and the movable contactor is in contact with the fixed contactor, the movable iron core and the movable contactor are fixed to the fixed iron core. In the opened state of the vacuum valve in which the movable contactor is separated from the fixed contactor, the closing side magnetic circuit for magnetically attracting in the direction of pressing the movable contactor is formed with respect to the fixed core. Are wound on the side of the movable iron core on which the movable contact is pressed against the fixed contact, and three pairs of permanent magnets that form an open-side magnetic circuit for magnetically attracting the movable contact from the fixed contact are energized. At times, three closing coils for magnetically attracting the movable iron core in the direction of pressing the movable contact against the fixed contact, and to the side where the movable contact of each of the movable iron cores is separated from the fixed contact. And three opening coils for magnetically attracting the movable iron core in the direction of separating the movable contact from the fixed contact when energized, and the magnetic flux generated when the energizing coil and the opening coil are energized is Since the permanent magnets are configured to flow in the magnetization direction of the permanent magnets, there is no demagnetization of the permanent magnets during opening and energization of the closing coil, and there are three movable magnets incorporated in one fixed iron core. With the iron core, vacuum valves for three phases can be opened / closed, the reliability of the opening / closing operation can be improved, and an operating device for a power switchgear can be obtained in which the number of parts can be reduced.

Further, the arrangement direction of the movable iron cores coincides with the arrangement direction of the vacuum valves, and the movable iron cores, the elastic members and the insulating rods are linearly arranged for each of the vacuum valves. Therefore, a link mechanism is not required, and reliability and durability can be improved and cost can be reduced by reducing the number of parts.

Further, since the movable iron core is an I-shaped iron core in which both the electromagnetic force generating surfaces are formed as flat surfaces orthogonal to the axis, the shape of the movable iron core is simple, and the variation in the operation for each combination occurs. It is suppressed and reliability is improved.

Further, since the portion of the fixed iron core facing the electromagnetic force generating surfaces is formed in a convex shape, the weight of the movable iron core can be reduced and the opening / closing operation speed can be increased.

In the movable iron core, the electromagnetic force generating surface on the closing side is formed into a flat surface orthogonal to the axis, and the electromagnetic generating surface on the opening side is flat against the flat surface perpendicular to the axis. Since it is an I-shaped iron core formed in a convex surface shape having a taper surface having a predetermined angle with respect to the axis formed at the edge of the surface, a large electromagnetic force is generated when the opening coil is energized. It is possible and the opening speed is increased.

The portion of the fixed iron core facing the electromagnetic force generating surfaces is formed in a convex shape, and the surface of the fixed iron core facing the electromagnetic generating surface on the open side is the open side. Since it is formed as a concave surface shape of an inner shape that roughly matches the outer shape of the surface, the weight of the movable iron core is reduced, the opening / closing operation speed is increased, and a large electromagnetic force is generated when the opening coil is energized. Force can be generated and the opening operation speed is further increased.

Further, since each pair of the permanent magnets is arranged so as to sandwich the movable core in the direction orthogonal to the axis of the movable core, the open side and closing side magnetic circuits can be simply constructed. it can.

Further, since each pair of the permanent magnets is arranged so as to sandwich the movable core in the axial direction of the movable core, the open side and closing side magnetic circuits can be simply constructed.

The movable iron core is a plate-like iron core having both electromagnetic force generating surfaces formed on a flat surface orthogonal to the axis, and the portion of the fixed iron core facing the both electromagnetic force generating surfaces is convex. A portion of the fixed core facing the side surface of the movable core is formed into a flat surface, and each pair of the permanent magnets sandwiches the movable core in a direction orthogonal to the axis of the movable core. Since it is attached and fixed to the flat surface of the fixed core, the weight of the movable core can be reduced, the opening / closing operation speed can be increased, and the permanent magnets can be arranged easily.

Further, since the control circuit power source capable of arbitrarily combining the individual drive and the simultaneous drive of the three sets of the closing and opening coils is provided, it is possible to operate according to the required drive characteristics.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an overall configuration of an operating device for a power switchgear according to Embodiment 1 of the present invention.

FIG. 2 is a diagram illustrating an opening operation of the vacuum valve by the operating device of the power switchgear according to Embodiment 1 of the present invention.

FIG. 3 is a diagram for explaining a closing operation of the vacuum valve by the operating device of the power switchgear according to Embodiment 1 of the present invention.

FIG. 4 is a circuit diagram showing a control circuit power supply of the operating device of the power switchgear according to Embodiment 1 of the present invention.

FIG. 5 is a circuit diagram showing an embodiment of a control circuit power supply of the operating device of the power switchgear according to Embodiment 1 of the present invention.

FIG. 6 is a cross-sectional view of essential parts showing an operating device for a power switchgear according to Embodiment 2 of the present invention.

FIG. 7 is a diagram for explaining the effect of the operating device for the power switchgear according to Embodiment 2 of the present invention.

FIG. 8 is a cross-sectional view of essential parts showing an operating device for a power switchgear according to Embodiment 3 of the present invention.

FIG. 9 is a main-portion cross-sectional view showing an operating device for a power switchgear according to Embodiment 4 of the present invention.

FIG. 10 is a cross-sectional view of essential parts showing an operating device for a power switchgear according to Embodiment 5 of the present invention.

FIG. 11 is a cross-sectional view of essential parts showing an operating device for a power switchgear according to Embodiment 6 of the present invention.

FIG. 12 is a schematic cross-sectional view showing a conventional operating device for a power switchgear.

FIG. 13 is a diagram for explaining an opening operation of a conventional operating device for a power switchgear.

FIG. 14 is a diagram for explaining a closing operation of a conventional operating device for a power switchgear.

[Explanation of symbols]

2 vacuum valve, 2a movable contact, 2b fixed contact, 2c vacuum container, 20 electromagnetic operation part, 21 fixed iron core, 22, 22A, 22B, 22C, 22D movable iron core, 24 closing coil, 25 opening side coil, 26
Permanent magnet, 27 Insulation rod, 28 Wipe spring (elastic member), 30 Closing side magnetic circuit, 31 Opening side magnetic circuit, 35a, 35b Tapered surface, 36a, 36b Recessed portion, 37, 37b, 38, 38a, 38b Convex portion, 50
Control circuit power supply, 100 switchgear, A magnetization direction.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shinji Sato             2-3 2-3 Marunouchi, Chiyoda-ku, Tokyo             Inside Ryo Electric Co., Ltd. (72) Inventor Takao Tsurimoto             2-3 2-3 Marunouchi, Chiyoda-ku, Tokyo             Inside Ryo Electric Co., Ltd. (72) Inventor Kenichi Koyama             2-3 2-3 Marunouchi, Chiyoda-ku, Tokyo             Inside Ryo Electric Co., Ltd. (72) Inventor Takafumi Nakagawa             2-3 2-3 Marunouchi, Chiyoda-ku, Tokyo             Inside Ryo Electric Co., Ltd. (72) Inventor Shunji Yamamoto             2-3 2-3 Marunouchi, Chiyoda-ku, Tokyo             Inside Ryo Electric Co., Ltd. F-term (reference) 5E048 AB01 AC05 AD02 CA01

Claims (10)

[Claims] 1. An operating device for an electric power switchgear in which vacuum valves having movable contacts and fixed contacts that are provided in a vacuum container so as to be able to come into contact with and separate from each other are arranged side by side in three rows. Three insulating rods fixed to each of the contactors, three movable iron cores made of a magnetic body that are connected to each of the insulating rods, and have both axial end faces as electromagnetic force generating faces, Magnetic bodies in which two movable iron cores are arranged in a row in a direction orthogonal to the axial direction of the movable iron core so as to be movable in the axial direction of the movable iron core with the axial directions of the movable iron cores parallel to each other. Of the fixed iron core, three elastic members interposed between the insulating rod and the movable iron core to urge the movable contactor against the fixed contactor, and Fix each other by sandwiching each In the closed state of the vacuum valve disposed in the core and in which the movable contact is in contact with the fixed contact, the movable iron core is pressed against the fixed iron core in a direction in which the movable contact is pressed against the fixed contact. In the opened state of the vacuum valve, which constitutes a closing side magnetic circuit for magnetically attracting and the movable contact is separated from the fixed contact, the movable iron core is fixed to the fixed iron core by the movable contactor. Three pairs of permanent magnets that form an open-side magnetic circuit that magnetically attracts in the direction of separation from the child, and the movable iron cores are wound around the movable contactors that press the movable contactors against the fixed contactors. Of three closing coils for magnetically attracting the movable contactor to the fixed contactor in the direction of pressing the movable contactor and the movable contactor of the movable iron core on the side separating the fixed contactor from each other, and energizing Sometimes, the movable iron core is provided with three opening coils that magnetically attract the movable contact in a direction to separate the movable contact from the fixed contact, and the magnetic flux generated when the closing coil and the opening coil are energized causes the permanent magnet to An operating device for a switchgear for electric power, which is configured to flow in a magnetization direction of a permanent magnet. 2. The arrangement direction of the movable iron cores coincides with the arrangement direction of the vacuum valves, and the movable iron cores, the elastic members and the insulating rods are linearly arranged for each of the vacuum valves. The operating device for an electric power switchgear according to claim 1, wherein the operating device is an electric power switchgear. 3. The opening / closing for electric power according to claim 1 or 2, wherein the movable iron core is an I-shaped iron core in which both the electromagnetic force generating surfaces are formed as flat surfaces orthogonal to the axis. The operating device of the device. 4. The operating device for a power switchgear according to claim 3, wherein a portion of the fixed iron core facing the electromagnetic force generating surfaces is formed in a convex shape. 5. The movable iron core is such that the electromagnetic force generating surface on the closing side is formed as a flat surface orthogonal to the axis, and the electromagnetic generating surface on the opening side is a flat surface orthogonal to the axis. The I-shaped iron core formed in a convex surface shape having a taper surface having a predetermined angle with respect to an axis formed on an edge portion of the surface. Operating device for power switchgear. 6. A portion of the fixed iron core facing the electromagnetic force generating surfaces is formed in a convex shape, and a surface of the fixed iron core facing the open electromagnetic generating surface is the open electromagnetic generating surface. 6. The operating device for a power switchgear according to claim 5, wherein the operating device is for an electric power switchgear, and is formed in a concave surface shape of an inner shape that substantially matches the outer shape of the surface. 7. The pair of permanent magnets is arranged so as to sandwich the movable iron core in a direction orthogonal to the axis of the movable iron core, according to any one of claims 1 to 6. An operating device for the power switchgear described. 8. The electric power according to claim 1, wherein each pair of the permanent magnets is arranged so as to sandwich the movable core in the axial direction of the movable core. Switchgear operating device. 9. The movable iron core is a flat iron core in which both electromagnetic force generating surfaces are formed on a flat surface orthogonal to the axis, and a portion of the fixed iron core facing the both electromagnetic force generating surfaces is convex. A portion of the fixed core facing the side surface of the movable core is formed into a flat surface, and each pair of the permanent magnets sandwiches the movable core in a direction orthogonal to the axis of the movable core. The operating device for a power switchgear according to claim 1 or 2, wherein the stationary iron core is fixedly attached to a flat surface of the fixed iron core. 10. A control circuit power source capable of arbitrarily combining individual driving and simultaneous driving of the three sets of closing and opening coils, and further comprising: a control circuit power supply. An operating device for a power switchgear according to.