JPH0249617Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a switch control device that controls the opening and closing operations of circuit breakers, switches, etc.

[Prior Art] Fig. 2 is a circuit diagram showing a conventional switch control device that has been implemented by the applicant. In the figure, P and N are control power supplies, and 1 is, for example, a switch (not shown). A motor for storing the energy of a spring (not shown) to provide the closing force, 2 is a power storage completion contact that operates when this stored energy reaches a predetermined value, and 2a is a power storage completion contact. The contact 2b1 is a contact that opens when energy storage is completed, and this contact 2b1 is connected in series with the motor 1. 3 is a switch auxiliary contact that is linked to the opening/closing operation of the switch, 3b1 is the first opening/closing auxiliary contact, 3b2 is the second opening/closing auxiliary contact, and the contact 3b1 is the contact when the energy storage is completed. It is connected in series with the open contact 2b1. Reference numeral 4 denotes a closing coil that releases the latch (not shown) of the loaded closing spring when energized to close the switch, 5 a control relay connected in series with this closing coil, and 5b a closing coil. This is a control relay contact that opens when the control relay is operated, and this contact 5b is connected in series to the series contact circuit of the energy storage completion close contact 2a and the switch open close auxiliary contact 3b2, which are connected in parallel with the control relay 5. and controls the opening and closing of this series contact circuit. Reference numeral 6 denotes a closing command switch for energizing the closing coil 4.

Next, the operation shown in FIG. 2 will be explained. When voltage is applied to the control power supplies P and N when the switch is in the open state, the motor 1 operates because the contacts 3b1 and 2b1 are both closed, and energy is stored in the closing spring. Begins. When the stored energy reaches a predetermined value, the stored energy completion contact 2 is activated,
The open contact 2b1 opens when the energy storage is completed to stop the motor 1, and the close contact 2a closes when the energy storage is completed to prepare the switch for closing. When the closing command switch 6 is closed in this state, the closing coil 4 is energized via the switch open closing auxiliary contact 3b2, the energy storage completion closing contact 2a, and the control relay contact 5b, and the switch is closed. . When the switch is turned on, the energy of the closing spring is released, and the closing contact 2a opens when the energy storage is completed.
When the switch is opened, the closing auxiliary contact 3b2 is opened, and the control relay 5 is thereby excited and operated. The contact 5b is opened by the operation of the control relay 5, but the opening of the contact 5b forms a self-holding circuit of the control relay 5, and until the closing command switch 6 is opened, the contact 5b is closed when the switch is opened. Even if the auxiliary contact 3b2 and the energy storage completion close contact 2a are closed again, the closing coil 4 is prevented from operating again, and the switch is opened while the closing command switch 6 is closed. Prevents repeated closing operations. That is, the control relay 5 is provided to prevent the pumping operation of the switch.

[Problems to be solved by the invention] By the way, in FIG. 2, if the closing command switch 6 is closed before the energy storage in the closing spring is completed, the closing contact 2a opens when the energy storage is completed. As a result, the control relay 5 is energized and operates, and the contact 5b is opened, causing the control relay 5 to self-hold, and the switch is not closed even after energy storage is completed. . In order to close the switch at this time, it is necessary to once open the closing command switch 6 to release the self-holding of the control relay 5, and then close the closing command switch 6 again. In other words, in the conventional device, the closing operation of the switch cannot be performed unless a closing command is given after the energy storage of the closing spring is completed, so there is a drawback that closing control is required to match the timing with the energy storage time. Further, according to the conventional device shown in FIG. 2, the operation of the control relay 5 is performed by opening the auxiliary closing contact 3b2 when the switch opens and the closing contact 2a when the energy storage is completed, as described above, but the contacts 3b2, 2
Even if any one of the contacts 3b2 and 2a opens, while an arc is occurring at that contact, a shunt occurs in the control relay 5 due to the arc resistance, and as a result, an arc occurs at the contacts 3b2 and 2a. Since the control relay 5 operates and opens the control relay contact 5b, the excitation current of the closing coil 4 is cut off by the contact 5b. For this reason, the control relay contact 5b also needs to have a suitable breaking ability, and there is a problem in that the control relay 5 for preventing pumping operation becomes larger accordingly.

This invention was made in order to solve this problem, and it is possible to perform the closing operation as soon as the energy storage is completed, regardless of the closing timing of the closing command switch, and to prevent the current from being cut off by the control relay contact. The aim is to miniaturize the control relay.

[Means for solving the problem] This invention provides a closing auxiliary contact when the switch is closed that is linked to the opening/closing operation of the switch, and this auxiliary switch closing contact is connected to the energizing circuit of the control relay for preventing pumping operation. At the same time, a self-holding circuit is added to the control relay, and a close contact is provided that closes when the stored energy is released, and the close contact when released bypasses the control relay contact. This is how it was done.

[Function] This device prevents the control relay from operating only by closing the closing command switch by inserting an auxiliary contact for closing the switch in the energizing circuit of the control relay. The control relay shall be operated for the first time to open the energizing circuit of the energizing coil when the device is energized, and as a result, even if the energizing command switch is closed before energy storage is completed, the energy storage will continue. The switch can be turned on at the same time as the process is completed. Furthermore, by adding a self-holding circuit to the control relay, the operating state of the closing command switch is ensured while the closing command switch is closed, and the energizing circuit of the closing coil is kept open, thereby reliably preventing the pumping operation of the switch. Furthermore, by bypassing the control relay contact with the close-when-energized contact, the control relay contact can be opened with no current flowing, thus eliminating the need for the control relay contact to have a breaking capability.

[Embodiment] FIG. 1 is a circuit diagram showing an embodiment of the switch control device according to this invention, and the same or equivalent parts as those of the conventional device shown in FIG. 2 are given the same reference numerals.

Now, in FIG. 1, 3a is an auxiliary closing contact when the switch is closed, which is inserted into the energizing circuit of the control relay 5 and is linked to the opening/closing operation of the switch, and 5a is the control relay 5.
The operation closed contact 2b2 of the control relay 5, which constitutes the self-holding circuit, is a discharge closed contact that closes when the stored energy is released, and the control is controlled by the closing of the discharge closed contact 2b2. A bypass circuit for relay contact 5b is created.

The operation shown in FIG. 1 will be explained. Similar to the conventional device, when the switch open-close auxiliary contact 3b1 closes due to the opening of the switch, it is assumed that the energy storage completion open contact 2b1 is closing due to the energy released when the switch was previously closed. At the same time, the motor 1 operates and energy storage begins. When energy storage is completed, the energy storage completion contact 2b1 opens to stop the motor 1, and the energy storage completion contact 2b1 opens to stop the motor 1.
By closing a, preparations for closing the switch are completed, and by closing the closing command switch 6, the closing coil 4 is energized and the switch is closed. By turning on the switch,
The closing contact 2a when the energy storage is completed and the closing auxiliary contact 3b2 when the switch is opened are opened, and the excitation current of the closing coil 4 is cut off. At the same time, since the switch closing auxiliary contact 3a is closed, the control relay 5 is operated, opening the control relay contact 5b and closing the control relay contact 5a. Contact 5b
By opening, the series contact circuit of the contacts 2a and 3b2 is opened, and the pumping operation of the switch is prevented while the closing command switch 6 is closed. On the other hand, the closing of the contact 5a serves to self-hold the control relay 5 and to ensure the operating state of the control relay 5 until the closing command switch 6 is opened. Furthermore, the discharge close contact 2b2 is closed at the same time as the switch is turned on, and the closing of this contact 2b2 constitutes a bypass circuit for the control relay contact 5b. Therefore, when the contact 5b is opened by the operation of the control relay 5, the current is not cut off at all. After contact 5b is opened, contacts 2a and 3
The arc at b2 is extinguished, contacts 2a and 3b2 are completely opened, and the bypass circuit is opened at the same time as the energy storage is completed, that is, at the same time as the release-closed contact 2b2 is opened, which is the original required function. There is no problem in the pumping operation prevention function of the switch.

Next, in FIG. 1, it is assumed that the closing command switch 6 is closed before the energy storage in the closing spring is completed. In this case, since the switch is still in the open state, the closing auxiliary contact 3a is not closed when the switch is closed, and therefore the control relay 5 does not operate. The excitation circuit 4 is not opened, and the input command switch 6 remains closed. Next, when the energy storage is completed, the closing contact 2a closes when the energy storage is completed, and the closing coil 4 is energized to close the switch. After the switch is turned on, the same operation as when the closing command switch 6 is closed after the completion of energy storage described above is performed.

[Effects of the invention] As explained above, this invention provides a control relay that closes when the switch is closed in the energizing circuit of the control relay that is connected in parallel to the series contact circuit of the contact that closes when the energy storage is completed and the auxiliary contact that closes when the switch opens. Since the auxiliary contact is inserted, even if the power-on command switch is closed before the energy storage is completed, the control relay will not operate, and the power can be turned on automatically after the energy storage is completed. In other words, according to this invention, the switch can be closed at the same time as energy storage is completed, regardless of the closing timing of the closing command switch.
There is no need to worry unnecessarily about controlling the closing command switch, and in addition, the closing operation can be performed after the energy storage is completed, thereby eliminating time loss. Furthermore, since the control relay has a self-holding function, it reliably locks the excitation circuit of the closing coil and does not impair its original function of preventing switch pumping operation. Furthermore, since the control relay contact that opens the excitation circuit of the closing coil is bypassed by the contact that closes when it is turned on, there is no need to provide the control relay contact with a breaking ability, so the control relay can be made smaller and the control An inexpensive switch control device can be obtained because the circuit can be configured with a printed circuit board.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of this invention, and FIG. 2 is a circuit diagram showing a conventional device. In the figure, 2a is a contact that closes when energy is stored, 2b2 is a contact that closes when released, 3a is an auxiliary contact that closes when the switch is closed, 3b2 is an auxiliary contact that closes when the switch is opened, 4 is a closing coil, and 5 is a self-holding contact. 5a is a control relay, 5b is a control relay contact, and 6 is a closing command switch. In addition,
The same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] A control device for a switch operated by stored energy includes a closing coil that releases the stored energy when energized to close the switch, a closing command switch that energizes the closing coil, and a closing command switch that energizes the closing coil. a series contact circuit consisting of an energy storage completion close contact that closes when the energy storage reaches a predetermined value, and a switch open/close auxiliary contact that is linked to the opening/closing operation of the switch; A control relay with a self-holding function connected in parallel to the series contact circuit via an auxiliary contact to close when the switch is closed, which is linked to the opening/closing operation of the switch, and opens the series contact circuit when the control relay is operated. A switch control device comprising a control relay contact, the control relay contact being bypassed by a discharge close contact that closes when the stored energy is discharged.