JPH07161265A - Electric power switching device - Google Patents

Abstract

PURPOSE:To perform space saving without generating arc short-circuiting and further capable of corresponding to also a load permitting only instantaneous breaking by forming electric power switching respective auxiliary contactors placed adjacent to main contactors further formed integrally. CONSTITUTION:The first auxiliary contactor 21 is formed adjacent to the first main contactor 11 further integrally, to obtain the first compound contactor 10. The second auxiliary contactor 22 is formed adjacent to the second main contactor 12 further integrally to obtain the second compound contactor 20. When a switching command is given, the first main contactor 11 is opened. Just after the first main contactor 11 is opened and just before the auxiliary contactor 21 is opened, a voltage drop is generated because the first current control element 31 is inserted between the first power supply P1 and a load L. In the current control element 31, an arc current, just after opening the auxiliary contactor 21, is suppressed. Also in the second compound contactor 20, arc short-circuiting, based on short-circuiting between power supplies P1, P2, is prevented by providing the second current limiting element 32.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power source switching device for selectively switching two different power sources to connect to a load. From the viewpoint of improving reliability of power supply and effective use of energy, the recent trend is to provide a plurality of power sources, usually two systems. For example, in factories, buildings, etc. that have loads such as lighting equipment, electric motors, and various electric devices,
In addition to the conventional commercial power source as the first power source, a second power source that uses city gas, exhaust heat, or the like as an energy source is provided. A representative example of the second power source is a generator power source in a cogeneration system.

The present invention describes a power supply switch used to switch the power supply to a load from a first power supply to a second power supply and from a second power supply to a first power supply.

[0003]

2. Description of the Related Art FIG. 12 is a block diagram showing the principle of a general power switch. In the figure, the power source switching unit is the first power source P1.
The first contact 1 connected between the load L and the second power source P
2 and a load L, and a second contactor 2 that is opened and closed complementarily to the first contactor 1. Complementarily means that when the first contact 1 is closed (or opened), the second contact 2
Means open (or closed). So to speak, it constitutes a transfer switch. In the figure, the first and second contacts 1 and 2 are connected by a one-dot chain line to show that they open and close complementarily. It should be noted that description of electromagnetic coils and the like for driving the first and second contacts is omitted here.

FIG. 13 is a sequence diagram showing the operation of a general power supply switching device. In the figure, V _L represents a voltage waveform applied to the load L. Although _VL is actually an AC waveform, it is shown as a DC waveform in the figure for easy understanding. In the sequence of this figure, first the first power source P1 is connected to the load L, then switched to the second power source P2 by the switching command (1), and after a while, the first power source P1 is switched by the switching command (2). This shows a typical mode of returning to P1.

Before the switching command (1) is given, the first and second contacts 1 and 2 in the power switching device are in the open / closed state as shown in FIG. And the switching command (1)
Is given to the power switch, the first contact 1 is changed from closed to open and the second contact 2 is changed from open to closed after a slight delay due to the sensing time of the electromagnetic coil in the power switch. Become. After the switching instruction (2) is given, the state is completely opposite to the above.

The switching time at the time of opening and closing the first and second contacts 1 and 2 described above is shown as t1 in the figure, but this t1 is normally set to be 20 to 30 ms, which is considerably long. The reason is as follows. 12
Referring to FIG. 13 and FIG. 13, when the first contactor 1 goes from closed to open, an arc is generated between the contact pairs of the first contactor 1 for a while immediately after the opening. If this arc is not extinguished, substantially the first contact 1 remains apparently closed and then the second contact 2 is closed, the first contact
An arc short circuit will occur between the power source P1 and the second power source P2. This short-circuit arc current is extremely large and causes damage. In this case, when the AC voltage phase of P1 and the AC voltage phase of P2 completely match, such arc short circuit does not occur. However, in reality, it is rare that the AC voltage phases of the two completely match at the time of power source switching, and there is a phase shift between the AC voltages of the two.
Due to this phase shift, the above arc short circuit will occur.

Therefore, in general, the time from the opening of the first contactor 1 (or the second contactor 2) to the closing of the second contactor 2 (or the first contactor 1) is sufficient. It takes a long time, and the other contactor is closed after waiting for the arc at the opening of one contactor to be completely extinguished. For this,
A switching time t1 of 20-30 ms is required.

By the way, the above-mentioned switching time t1 of 20 to 30 ms corresponds to the time of power interruption (power failure) for the load L. Usually, such a power failure for about 20 to 30 ms does not cause any trouble in a general electric light load or electric motor load. However, in recent years, many OA devices such as personal computers, workstations, and word processors have come to be included in the various electric devices described above. These OA devices most dislike power cutoff, and if the time is long, so-called system down will occur. In other words, these OA devices are allowed only a momentary power interruption. This instantaneous interruption is usually about 10 ms. Note that there are electric appliances other than the above-mentioned OA appliances that allow only such a momentary interruption. For example, it is a relay sequence control board having a self-holding function.

As described above, in a general power supply switching device, if the load L includes an electric device that has a long switching time t1 and allows only a momentary power interruption, the electric device is normally operated. There was an inconvenience that it hindered the operation. If the drive mechanism of the contactors 1 and 2 is simply adjusted so as to shorten the time t1, this causes a serious obstacle such as the above-mentioned arc short circuit between the power supplies.
Therefore, the present applicant has already proposed a new power source switching device in order to eliminate the above-mentioned inconvenience (Actual Publication No. 4-119939).
And, the operation principle that is almost the same as that of the new power switch has been statically realized, that is, it is made of a low resistance metal that gradually opens and closes each other so that the dynamic mechanism member can be eliminated as much as possible. A patent application has also been filed for a power source switching device including a pair of contacts formed by a contact body and a tip made of high-resistance metal (Japanese Patent Laid-Open No. 5-174676). However, the following description will be given with reference to the principle configuration disclosed in the former application.

FIG. 14 is a diagram showing the principle configuration of a conventional power supply switching device already proposed by the present applicant, which corresponds to a load that does not cause an arc short circuit and allows only instantaneous interruption. It is a power switch to obtain. In this figure,
Reference numeral 11 is a first main contact (corresponding to the first contact 1) connected between the first power source P1 and the load L, and 12 is a second contact.
A second main contactor (corresponding to the second contactor 2) 21 that is connected between the power source P2 and the load L and that opens and closes complementarily to the first main contactor (shown by a chain line in the figure), 21 is First main contact 11
Connected in parallel to the first main contactor 11 (in the figure,
(Shown by the dotted line) and then closes earlier and opens later 1st
The auxiliary contactor 22, 22 is connected in parallel to the second main contactor 12,
In addition, the second auxiliary contactor 3 which is interlocked with the second main contactor 12 (indicated by a dotted line in the drawing) to close earlier and open later than this, 3
Reference numeral 1 is a first current limiting element connected in series to the first auxiliary contact 21, and 32 is a second current connection element connected in series to the second auxiliary contact 22.
It is a current limiting element. More preferably, the third current limiting element 33 is provided. This element 33 includes the first main contact 11
And an intermediate connection point between the second main contactor 12 and an intermediate connection point between the first auxiliary contact 21 and the second auxiliary contact 22.

The operation of the conventional power supply switching device will be described in detail later.

[0012]

FIG. 15 is a schematic view of an apparatus constituting the power source switching device shown in FIG. 14, which is seen from the front. Moreover, it corresponds to the three-phase three-wire system (R, S, T). In the figure, reference numerals 11 and 12 show the arrangement of the first and second main contacts, and 21 and 22 show the arrangement of the first and second auxiliary contacts. Parts 11 ′ and 12 ′ shown by dotted lines in the figure represent the arrangement of the electromagnetic mechanism parts on the main contact side (MG 1, MG 2 in FIG. 9 described later) and the seesaw-type crank mechanism part, and 21 ′ and 22 'Indicates the arrangement of the seesaw type crank mechanism part on the auxiliary contact side.

As can be seen from FIG. 15, there is a problem in that the conventional power source switching device is considerably large in size, expensive, and occupying a large space. That is, assuming that the space occupied by the general power switching device shown in FIG. 12 corresponds to the “general space occupied” shown in FIG. 15, the space occupied by the conventional power switching device shown in FIG. Like the "conventional space" of,
For example, even if a general power switching device (equivalent to FIG. 12) that has been installed in an existing closed cubicle for many years is replaced with a power switching device equivalent to FIG. 14, it is impossible due to space restrictions. Things were happening.

Therefore, in view of the above problems, the present invention causes an arc short circuit while maintaining a small space close to a general power source switching device that occupies a space described as "general occupied space" in FIG. It is an object of the present invention to provide a small-sized power supply switching device that can handle a load that does not allow only momentary interruptions.

[0015]

FIG. 1 is a principle configuration diagram of a power source switching device according to the present invention. Note that the same reference numerals or symbols are given to the same components throughout the drawings.
The power supply switching device shown in this figure is basically a power supply switching device that selectively switches between the first power supply P1 and the second power supply P2 to connect to the load L, as in the conventional configuration of FIG. , First
The first main contactor 11 connected between the power source P1 and the load L
And a second main contact 12 which is connected between the second power source P2 and the load L and which opens and closes complementarily to the first main contact 11.
A first auxiliary contactor 21 that is connected in parallel to the first main contactor 11 and that closes earlier and opens later than this in parallel with the first main contactor and a second main contactor 12 are connected in parallel. And a second auxiliary contactor 22 which is interlocked with the second main contactor and is closed earlier and opened later than this, and a first current limiting element 31 connected in series to the first auxiliary contactor 21, It is a power supply switching device including a second current limiting element 32 connected in series to the second auxiliary contact 22.

The feature of the present invention lies in the following configuration. That is, (i) the first auxiliary contact 21 is replaced by the first main contact 1
1 and is integrally formed with the first main contactor 11 to form the first composite contactor 10, and (ii) the second auxiliary contactor 22 is close to the second main contactor 12. Then, the second composite contactor 20 is formed by integrally forming with the second main contactor 12.

[0017]

2 is a sequence diagram used for explaining the operation of the power supply switching device according to the present invention. However, the explanation of the operation described here also applies to the conventional power supply switching device (FIG. 14). Note that FIG. 2 corresponds to FIG. 13 described above. When the switching command (1) is given, the first main contactor 11 of the first composite contactor 10 first opens, and the contact changes from closed to open.
Therefore, V _L tends to fall along the dotted line a1. However, since the first auxiliary contact 21 that opens later than the first main contact 11 opens later, V _L drops along the solid line b1 in the figure. When the curve of the dotted line a1 shifts to the curve of the solid line b1, a state in which a voltage drop occurs is shown in the figure. This is immediately after the main contact 11 is opened and the auxiliary contact 21 is This is because the first current limiting element 31 is inserted between the first power source P1 and the load L immediately before opening, and a voltage drop occurs here. After that, the current limiting element 31 serves to suppress the arc current immediately after the auxiliary contact 21 is opened. That is, the auxiliary contactor 21 is a contactor that opens without an arc. However, on the other hand, at this time, the supply voltage to the load L decreases. Therefore, the current limiting element 3 is arranged so that the drop in the voltage supplied to the load L does not hinder the normal operation of the load.
The value of 1 (the same applies to the second current limiting element 32 described later) is adjusted in advance.

Subsequently, in the second composite contactor 20, the second auxiliary contactor 22 is closed earlier than the second main contactor 12.
Is closed, and V _L rises along the solid line b2 in the figure.
The closing of the second auxiliary contact 22 at this time is performed through the second current limiting element 32. Due to the presence of the second current limiting element 32, P1 and P
The occurrence of an arc short circuit in the first main contactor 21 due to a short circuit between the two is prevented. Then, following the closing of the auxiliary contact 22, the original second main contact 12 is closed. The dotted line a2 in the figure corresponds to V _L of the corresponding portion in FIG.

In the above description, the first composite contactor 10 side (first main and auxiliary contactors 11, 21) is open, and the second composite contactor 20 side (second main and auxiliary contactors 12, 22). Although the operation (when the switching command (1) is switched) is switched to the closed state, conversely, when the switching command (2) is given, that is, the second composite contactor 20 side is opened, the first The same applies to the operation when the composite contactor 10 side is closed.

After all, as is apparent from FIG. 2, the switching time t1 (20 to 30 ms) in the general power source switching device (FIG. 12) is generated without causing the arc at the time of opening.
It is almost halved to t2 (10 ms or less), and a high-speed power supply switching device is realized. The third current limiting element 33 shown in FIG. 14 has the following function, but is unnecessary in the present invention. That is, taking the case where the above switching command (1) is given as an example, when the first auxiliary contact 21 is opened, the arc should not occur here due to the first current limiting element 31. . However, assuming that this arc is generated and this arc is maintained without being broken until the second main contact 12 is closed, the first and second currents P1 and P2 are connected via this arc. Short circuit. In order to deal with such a case, the third current limiting element 33 is provided, and together with the first current limiting element 31, the occurrence of the arc short circuit is suppressed.

As described above, the operation sequence shown in FIG. 2 is almost the same as the operation sequence of the conventional power supply switching device, but the structure of the present invention for realizing this operation sequence is completely different from the conventional structure. This structural difference is apparent with reference to FIG. FIG. 3 is a diagram schematically showing the structural difference between the general case (A), the conventional case (B) and the case of the present invention (C). As described above, the symbols P1, P2 and L in the figure represent the first power source, the second power source and the load, respectively. The structure of (B) (corresponding to FIG. 14) is extremely large compared to the structure of (A) (corresponding to FIG. 12) of the same figure, but the present invention (C) (corresponding to FIG. 1). As a result, it is understood that the size is reduced to the size of the general type (A) while maintaining the same function as the conventional type (B). The first composite contactor 10 and the second composite contactor 20 contribute to the reduction.

[0022]

FIG. 4 is a view showing an embodiment of the composite contactor according to the present invention. Since the first composite contactor 10 and the second composite contactor 20 have the same structure, only one composite contactor 10 (20) side is depicted as a representative in this figure. In the first composite contactor 10 (the same applies to the second composite contactor 20, and the reference numeral of the corresponding member is indicated by adding "2" to the first digit), the first main contactor 11 (12 The same) and the first auxiliary contact 21 (22 is the same).
1 (the same applies to the second contact plate 42) face each other. In Figure 1,
First main contact 11 (same for 21) and first auxiliary contact 12
(22) is drawn so as to constitute the movable side contact, but in this figure, these are made the fixed side contacts, and the first contact plate 41 (4
2) is drawn as a contact on the movable side (in the figure, the upward and downward arrows indicate the movable direction). In principle, whichever is used as the fixed contact or the movable contact does not change. It should be noted that arc-resistant adherends G1 to G4 (for example, silver / tungsten) are brazed to the portions that generate an arc when the electrodes are opened.

The first main contactor 11 (same as 12) is made of a conductor such as copper, and is made of a first insulating substrate 71 (second insulating substrate 7).
2 is the same). First auxiliary contact 21
(22 is also the same) is supported by one end of the first conductive stud 51 (the same is true of the second conductive stud 52) and is movable together with the stud in the vertical direction (indicated by a double arrow) in the figure.
When the first contact plate 41 (42 is the same) comes down in the drawing, the first auxiliary contact 21 (22) compresses the first spring 61 (the same applies to the second spring 62). Meanwhile, the first main contactor 11 (12) is pressed downward until it is flush with the first main contactor 11 (12).

On the other hand, when the first contact plate 41 (42 is the same) moves upward, the first auxiliary contact 21 (22) also moves upward due to the restoring force of the first spring 61 (62), It stops when the first spring 61 (62) is fully extended. The first conductive stud 51 (52) is electrically connected to one end of the first current limiting element 31 (32 is also the same),
The other end is electrically connected to the first main contactor 11 (12) and the load L.

FIG. 5 is a view showing a modified example of the composite contact shown in FIG. The modified example of FIG. 5 is obtained by eliminating the first current limiting element 31 (same for 32) from the configuration of FIG. 4 for further compactness. For this purpose, first, the first conductive stud 51 (52) in FIG. 4 is replaced with the first insulating stud 81 (same for the second insulating stud 82). Further, the first insulating plate 71 (72) in FIG. 4 is replaced with the first conductive substrate 101 (second conductive substrate 102). here,
The first spring 61 (62 is also the same) in FIG. 4 is replaced with a first resistance-combining spring 91 (the second resistance-combining spring 92 is also the same). The resistance mentioned here functions as the first current limiting element 31 (32). As an example, the first resistance combined spring 91 (92) is made of stainless steel (JI
S SUS304) or piano wire (SWPA,
It was realized by a coil spring made of SWPB), and its resistance (measured at both ends) was about 0.1Ω.

FIG. 6 is a view showing a contact mode in the composite contactor. Contact modes are ON (conduction) and OFF
3 modes of (open) and ON / OFF corresponding to the middle of these are shown. If the aspect of the first composite contactor 10 transits from left to right in the figure, the aspect of the second composite contactor 20 transits from right to left in the figure. Alternatively, the reverse transition occurs. The structure of the composite contactor in FIG. 6 is shown in FIG. 5, but the situation is exactly the same in the structure shown in FIG.

When the first composite contact 10 (20) is opened,
First, an arc A is generated between the adherends G1 and G2 (O
N / OFF). At this time, the adherends G3 and G4 are still in contact with each other. When the contact is further opened, an arc A is generated between the adherends G3 and G4, and the arc A between the adherends G1 and G2 is weakened. When the contact is further opened, the arc A disappears and the first composite contact 10 is completely opened (O
FF).

Here, from (ON / OFF) to (OF
At the transition to F), pay particular attention to the occurrence of arc A.
In general, the behavior of the arc generated between the contact pairs when the contacts are opened is completely random and cannot be determined. Therefore, during the transition from (ON / OFF) to (OFF) in FIG. 6, an arc as indicated by A ′ in FIG. 6 may occur.
When such an arc A ′ occurs between the adherends G2 and G4, G3, the original arc A only between G3 and G4 cannot be obtained. This G3 and G4
If the arc A only between the two is not obtained, the first auxiliary contactor 2
1 (22) via the first power source P1 (P2) and the load L, the desired current limit that should be transiently applied (by the first resistance combined spring 91 (or 92)) is no longer applied. I will end up. This is because in the (OFF) mode of FIG. 6, the unnecessary arc A ′ is the current limiting resistor (91, 9).
This is because it is equivalent to electrically shorting both ends of 2).

Therefore, such unnecessary arcs A'must be eliminated, but the elimination measures include, for example, the following. FIG. 7 is a diagram for explaining means for preventing the generation of the unnecessary arc A ′. (I) The first exclusion measure is the first arc shield 111 (second
The same applies to the arc shield 112). As a result, the generation of the unnecessary arc A ′ extending to the adherends G2 and G4, G3 can be completely prevented.

(Ii) Arc A shows adherends G2 to G4, G
The blowing direction of the arc extinguishing high-pressure air is set to the direction perpendicular to the paper surface so as not to extend to 3. In this way, arc A between G1 and G2
Is extinguished without being entangled with the G3 and G4 sides. Since the power supply switching device is originally provided with the extinguishing high-pressure air generating part that cooperates with the arc shooter, the elimination measure of (ii) above can be realized only by devising the blowing direction of the high-pressure air.

FIG. 8 is a diagram showing a configuration example of a power source switching device according to the present invention, and FIG. 9 is a diagram showing a configuration example of a conventional power source switching device. By comparing FIG. 9 with FIG. 8 (Note: FIG. 8 is drawn approximately twice as large as FIG. 9), it is understood that the miniaturization effect of the present invention is sufficiently large. It Furthermore, FIG. 10 is a schematic view of an apparatus constituting a power supply switching device according to the present invention.
By comparing 5 with each other, it can be seen that the effect of miniaturization according to the present invention is great.

Here, paying attention to FIG. 9 (conventional power supply switching device), there are the first and second main contactors 11 and 12 on the upper side,
The lower side is the first and second auxiliary contacts 21 and 22. The two main contactors 11 and 12 driven by the electromagnetic mechanism parts (MG1, MG2) are opened and closed complementarily by, for example, a seesaw type crank mechanism (insulator). However, in the figure, for the sake of simplification, the seesaw type crank mechanism is represented by a chain line. The central fulcrum of the seesaw is indicated by 13, and the two main contacts 11 and 12 move up and down in the direction of the solid arrow or the direction of the dotted arrow shown.

A pair of coil springs 14 and a pair of contact leaf springs 15 are provided on the movable contact side of each main contact,
When the main contactor goes from open to closed, it closes while compressing these spring members, and the restoring force of these spring members causes the contact pairs of each contact to elastically contact each other and make good contact. maintain. The first and second main contacts 1 described above
A structure similar to the structure of 1, 12 is also applied to the first and second auxiliary contacts 21, 22. Therefore, 23 is a fulcrum, 24 is a pair of coil springs, and 25 is a pair of contact leaf springs.

These first and second auxiliary contacts 21 and 2
2 is “interlocked” with the first and second main contactors 11, 12 and “early closed / late open” with respect to these main contactors 11, 12.
Operate. In order to realize this "linkage", fulcrum 13
And the fulcrum 23 are arranged coaxially (indicated by dotted lines in the figure) so that the seesaw operation on the main contact (11, 12) side is transmitted as it is as the seesaw operation on the auxiliary contact (21, 22) side. To do.

Regarding the above-mentioned "early closing / late opening" operation,
This is achieved by shortening the opening stroke d on the auxiliary contact 21 or 22 side with respect to the opening stroke D on the main contact 11 or 12 side. Therefore, the inclusions 26 and 27 are inserted on the fixed contact side on the auxiliary contact side. For example, second
When the main contactor (same for the first main contactor 11) 12 goes from the open to the closed, the second move from the open to the closed in conjunction with this
The auxiliary contactor (same for the first auxiliary contactor 21) is
Due to the difference in the opening stroke (D> d), the second main contactor 12 naturally closes earlier. This achieves "early closing". At this time, the closing side spring members 14, 1
5 is fully compressed.

Next, when the second main contact 12 goes from closed to open, the second auxiliary contact 22 also goes from closed to open, but due to the difference in opening stroke (D> d), the second main contact 12 Even when the first contact starts to open, the second auxiliary contact 22 remains closed and does not open. During this time, the spring members (24, 25) of the contactor 22 press their movable contacts against their fixed contacts. Then, when the second auxiliary contact 22 is further opened and the restoring force of the spring member is completely lost (when the spring is fully extended), opening of the contact is started. Here, "late opening" is achieved. Therefore, the spring member needs to be provided at least on the side of the first and second auxiliary contacts 21 and 22.

The "early closed / late open" operation, which is almost the same as the "early closed / late open" operation in the conventional power supply switch described in detail above, is also realized in the power supply switch of the present invention shown in FIG. All of the main components in FIG. 8 (showing a two-point cut structure as an example) have already been described and are already shown in any of the figures. However, the arc shooter and the high-pressure air generating portion for extinguishing arc described above are first shown in FIG. A first arc shooter (131) similar to the second arc shooter 132 on the second composite contactor 20 side (right side) also exists on the first composite contactor 10 side (left side), but the diagram is complicated. Therefore, the description is omitted.

The second arc extinguishing high-pressure air generating portion 122 forms an air reservoir by means of the lower slide valve 123. When the second composite contactor 20 is opened, the plunger shaft 124 of the electromagnetic mechanism portion MG2 rapidly moves upward in the drawing, and high-pressure high-speed air is blown out from the air blowout port 125. As a result, the arc that accompanies the opening is blown away, and the second case cover 126 is formed of a metal plate that extends in multiple layers.
It is captured by the arc shooter 132 and extinguishes the arc.

When the second composite contactor 20 (same for 10) is opened, first the second main contactor 12 opens the arc from the second contact plate 42 while drawing an arc, and subsequently, the second combined resistance spring. The second auxiliary contactor 22 is opened from the second contact plate 42 through 92 through a slight arc. And finally the figure 8
To the open state similar to the state of the first composite contactor 10 shown on the left side of FIG.

In FIG. 8, the fulcrum 13, the first and second points
The coil springs 14-1 and 14-2, the first and second contact springs 15-1 and 15-2, etc. are the components already described in FIG. Further, the difference between the stroke D and the stroke d shown in FIG. 9 is the same as the difference between the axial length D of the first resistance / spring 91 on the extension side and the height d of the first and second main contactors in FIG. Expressed as the difference.

FIG. 11 is a connection diagram of a power source switching device according to the present invention, showing a case of a three-phase three-wire system. Of course, it is also applicable to the case of single-phase or three-phase four-wire system. A single-phase load such as an OA device in the load L is connected between any two phases. However, the connections in this figure are in one line.

[0042]

As described in detail above, according to the present invention, 2
Suitable for connecting a load including OA equipment that causes a system down with a long power switching time of 0 to 30 ms, that is, switching can be completed by instantaneous power interruption, and an extremely compact power switching device is realized. To be done.

[Brief description of drawings]

FIG. 1 is a principle configuration diagram of a power supply switching device according to the present invention.

FIG. 2 is a sequence diagram used for explaining the operation of the power supply switching device according to the present invention.

FIG. 3 is a diagram schematically showing a structural difference between a general case (A), a conventional case (B), and a case of the present invention (C).

FIG. 4 is a diagram showing an embodiment of a composite contactor according to the present invention.

5 is a diagram showing a modified example of the composite contact shown in FIG.

FIG. 6 is a diagram showing a contact mode in a composite contactor.

FIG. 7 is a diagram for explaining means for preventing the generation of unnecessary arcs.

FIG. 8 is a diagram showing a configuration example of a power supply switching device according to the present invention.

FIG. 9 is a diagram showing a configuration example of a conventional power supply switching device.

FIG. 10 is a schematic view of an apparatus constituting a power switch according to the present invention.

FIG. 11 is a connection diagram of a power source switching device according to the present invention.

FIG. 12 is a principle configuration diagram of a general power supply switching device.

FIG. 13 is a sequence diagram showing an operation of a general power supply switching device.

FIG. 14 is a diagram showing a principle configuration of a conventional power supply switching device.

FIG. 15 is a schematic view of an apparatus forming the power supply switching device shown in FIG.

[Explanation of symbols]

 10 ... 1st compound contact 11 ... 1st main contact 12 ... 2nd main contact 20 ... 2nd compound contact 21 ... 1st auxiliary contact 22 ... 2nd auxiliary contact 31 ... 1st current limiting element 32 ... second current limiting element 41 ... first contact plate 42 ... second contact plate 51 ... first conductive stud 52 ... second conductive stud 61 ... first spring 62 ... second spring 71 ... first insulating substrate 72 ... second Insulating substrate 81 ... First insulating stud 82 ... Second insulating stud 91 ... First resistance and spring 92 ... Second resistance and spring 101 ... First conductive substrate 102 ... Second conductive substrate 111 ... First arc shield 112 ... Second 2 arc shield 121 ... 1st arc extinguishing high pressure air generation part 122 ... 2nd arc extinguishing high pressure air generation part 131 ... 1st arc shooter 132 ... 2nd arc shooter P1 ... 1st power supply P2 ... 2nd power supply L Load G1 to G4 ... arc resistance of the adherend

Claims (5)

[Claims] 1. A first power supply (P1) and a second power supply (P1)
A power switch for selectively switching 2) to connect to a load (L), the first main contactor (11) being connected between the first power supply and the load, and the second power supply. A second main contactor (12) connected between the first main contactor and the first main contactor, the second main contactor (12) being opened / closed complementarily to the first main contactor, and the first main contactor being connected in parallel to the first main contactor. A first auxiliary contactor (21) that is closed earlier than this and opens later than this, and is connected in parallel to the second main contactor and is interlocked with the second main contactor A second auxiliary contactor (22) that closes earlier and opens later, a first current limiting element (31) connected in series to the first auxiliary contactor, and a second auxiliary contactor connected in series to the second auxiliary contactor In a power supply switching device including a current limiting element (32), the first main contactor and the first auxiliary contactor are close to each other. The first main contactor and the second auxiliary contactor are in contact with each other and integrally formed to form the first composite contactor, and the second main contactor and the second auxiliary contactor are close to each other and integrally formed. And a second composite contactor (20). 2. In the first composite contactor (10),
A first contact plate (41) facing the first main contactor (11) and the first auxiliary contactor (21) and forming a contact pair with them is provided, and the first auxiliary contactor is With the opening of the first composite contactor, is movable so as to protrude from the first main contactor and approach the first contact plate;
Further, in the first composite contactor (20), a second contact plate (42) which faces the second main contactor (12) and the second auxiliary contactor (22) and constitutes a contact pair with them. ) Is provided, the second auxiliary contactor is movable so as to protrude from the second main contactor and come close to the second contact plate when the second composite contactor is opened. The power supply switching device according to item 1. 3. The first auxiliary contactor (21) is connected to the first auxiliary contactor (21).
The second contact plate (42) includes a first spring for approaching the contact plate (41), and the second auxiliary contact (22).
The power supply switching device according to claim 2, further comprising a second spring that is brought closer to the power supply. 4. The first spring comprises a first resistance-combining spring (91) which also functions as the first current limiting element (31), and the second spring comprises the second current limiting element (31). 32)
The power supply switching device according to claim 3, wherein the power switching device comprises a second resistance-combining spring (92) that also functions as a member. 5. A first arc shield (111) between the first main contact (11) and the first auxiliary contact (21).
The second main contactor (12) and the first auxiliary contactor (2).
The power switch according to claim 2, wherein a second arc shield (112) is interposed between the second arc shield and the second arc shield.