JP3298740B2 - Switchgear control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch control device for controlling a switching operation of a switch such as a circuit breaker.

[0002]

2. Description of the Related Art FIG. 2 shows, for example, a catalog "Mitsubishi JEM 1425 high-pressure vacuum circuit breaker for switch gear" P3
6 is a circuit diagram showing the conventional switch control device shown in FIG. 6, in which P and N are control power supplies, and 1 is a closing spring (not shown) for giving a throwing input of, for example, a switch (not shown). Motor) to store energy
Reference numeral 2 denotes an auxiliary relay having contacts 3 and 4.

[0005] Reference numeral 5 denotes an energizing completion contact which operates during the energization of the spring to continue the excitation of the auxiliary relay 2 and turns off when the energized energy reaches a predetermined value, and 6 activates the auxiliary relay 2 A start-up contact 7 for starting the rectifier is a rectifier for converting the control power supplies P and N into DC power supplies when the control power supplies P and N are AC power supplies.

Next, the operation will be described. When a voltage is applied to the control power supplies P and N when the switch is in the open state,
The coil (not shown) of the auxiliary relay 2 is excited via the start-up contact 6 and the contacts 3 and 4 of the auxiliary relay 2 are turned on.

[0005] When the contacts 3 and 4 of the auxiliary relay 2 are turned on, the motor 1 is started via the rectifier 7 to start accumulating energy in the closing spring.

Next, during the energy storage in the closing spring, the starting contact 6 is mechanically turned off, and the charging completion contact 5 performs a self-holding operation to continue the excitation of the auxiliary relay 2. Then, the motor 1 continues to rotate, and while the closing spring is mechanically charged, the closing latch (not shown) and the tripping latch (not shown) are engaged to store the charged energy.

In this way, when the charging of the input energy is completed, the charging completion contact 5 is mechanically turned off, the excitation of the auxiliary relay 2 is released, and the contacts 3 and 4 of the auxiliary relay 2 are turned off. When the contacts 3 and 4 are turned off, the voltage supply to the motor 1 is stopped, and the driving of the motor 1 is stopped.

[0008]

[SUMMARY OF THE INVENTION Conventional switch control equipment
Which is configured as the following is the circuit configuration for driving the motor or the like necessary for energizing the energy to the closing spring is relatively simple, has rotated the motor or the like in only one direction Therefore, there is a problem in that there is a loss in the energy storage and a complicated mechanism such as providing a gas box or the like makes the entire control device expensive.

In addition, in the operation for storing energy in the spring for supplying the input of the switch, if the voltage of the control power supply P or N is lost during the storage of the input energy, the energy to the input spring is stored. Even if the start of the motor 1 is stopped and the voltage is supplied to the control power sources P and N again and the motor 1 starts to start, the load is large because the energy to the closing spring is partially stored. motor 1 there is a problem, such as can lead to burnout if you can not resume the energy energy-storing of the closing spring.

The first aspect of the present invention has been made to solve the above-described problems. By rotating the motor forward and backward, the loss of energy storage can be reduced, and the mechanism can be simplified. It is an object of the present invention to obtain a switchgear control device that can be used.

According to a second aspect of the present invention, there is provided a switch which can return the energy storage lever to the initial state again after the end of the energy storage of the spring and can wait for the start of the next energy storage. The aim is to obtain a control device.

According to a third aspect of the present invention, when the power is lost during the energy storage in the spring, the energy load is not restarted during the power recovery and the motor load is not excessively increased. An object of the present invention is to obtain a switch control device capable of restarting energy storage after returning to an initial state.

A fourth object of the present invention is to provide a switch control device capable of preventing or suppressing the occurrence of a short circuit due to an arc between contacts and the inrush current of a motor circuit when the motor is started reversely.

[0014]

According to a first aspect of the present invention, there is provided a control device for a switch, comprising: a start / stop contact for controlling start / stop of a motor; A reverse rotation contact for switching to a reverse rotation operation is provided, and an auxiliary relay connected in series to a power supply together with the reverse rotation contact and the start / stop contact performs forward / reverse control of the motor. .

The control device of the switch according to the inventions of claims 2, when energy prestressing the spring by the forward rotation of the motor reaches a predetermined value, the motor is reversed activated by the operation of the reversing contacts The energy storage lever is returned to the initial position and stands by for the next energy storage operation.

According to a third aspect of the present invention, when the power supply is lost during energy storage, the energy storage lever is once returned to the initial position, and the energy is again supplied by inputting the power again. It is designed to restart the accumulation of energy.

According to a fourth aspect of the present invention, there is provided a control device for a switch, wherein a current limiting resistor is connected in a drive circuit of a motor.

[0018]

According to the first aspect of the present invention, there is provided a control device for a switch,
A motor start / stop contact and a reverse rotation contact are provided in a motor circuit for energy storage for a closing spring, so that forward / reverse control of the motor can be easily performed after the storage is completed.

According to a second aspect of the present invention, the control device for the switch activates the motor in reverse at the end of the charging to automatically return the energy storing lever to the initial position, and starts the next energy storing to the closing spring. Be prepared for.

According to a third aspect of the present invention, when the control power supply is lost while the energy is being stored in the closing spring, the control unit starts the motor in reverse when the control power supply is supplied again. The energy is again stored in the closing spring from the initial state to prevent the motor load from becoming excessive.

According to a fourth aspect of the present invention, the control device for the switch prevents the short circuit caused by the arc between the contacts by the reverse rotation start of the motor and makes it possible to suppress the supply of the rush current to the motor at the time of the forward and reverse start. .

[0022]

【Example】

Embodiment 1 FIG. An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 8 denotes a contact of the auxiliary relay 2 for rotating the motor 1 in a forward direction, and 9 denotes a contact of the auxiliary relay 2 for rotating the motor 1 in a reverse direction.

Reference numeral 10 denotes a contact for switching the forward / reverse rotation of the auxiliary relay 2 which is switched when the motor 1 is started to rotate forward / reverse. Reference numeral 11 denotes a contact of the auxiliary relay 2 used to hold the excitation of the auxiliary relay 2 by itself. , 12 are start / stop contacts of the motor 1.

Reference numeral 13 denotes a reverse contact for starting the motor 1 in the reverse direction. Reference numerals 14 and 15 denote a short circuit caused by an arc between the contacts when the motor 1 is started in the reverse direction, and a rush current due to the normal / reverse rotation. This is the provided current limiting resistor.

The other circuit components that are the same as those shown in FIG. 2 are given the same reference numerals, and redundant description is omitted.

Next, the operation will be described. When a voltage is applied to the control power supplies P and N when the switch is in the open state,
The coil of the auxiliary relay 2 is excited via the rectifier 7 and the contact a of the start / stop contact 12 and the reverse contact 13, and the contacts 8, 9, and 11 of the auxiliary relay 2 and the normal / reverse rotation switching contact 10 are switched. .

Accordingly, the contact 8 of the auxiliary relay 2 is turned on, the rotation is forward / reverse, and the forward / reverse rotation switching contact 10 is provided.
Is switched to the contact a side, the motor 1 is started in the normal rotation direction via the rectifier 7, and the energy storage in the closing spring is started.

Next, when the energy accumulation in the closing spring is started in this way, the start / stop contact 1
2 is mechanically switched to the contact b side, but the reverse voltage is not applied to the motor 1 because the contact 9 has already been switched off. Further, even if the contact a of the start / stop contact 12 is turned off, the contact 11 is held by the auxiliary relay 2 and is in the on state, so that the excitation of the auxiliary relay 2 can be continued, and the motor 1 Keeps rotating in the forward direction, mechanically accumulates the closing spring, engages the closing latch (not shown) and the release latch (not shown), and stores the energy of the closing spring. .

In this case, if the voltage of the control power supply P, N is lost for some reason during the energy storage in the closing spring, the auxiliary relay 2 is immediately de-energized and the contact 8 is turned off, and the motor 1 is turned off. Drive stops. Therefore, when a voltage is supplied to the control power sources P and N again, the contact of the contact for starting / stopping 12 is turned off and the contact of the contact b is turned on, so that the coil of the auxiliary relay 2 is not excited. .

However, at this time, the contact b of the start / stop contact 12, the contact 9, the current limiting resistors 14, 15, the motor 1
In addition, a current flows in the motor 1 in the reverse direction through the contact b of the forward / reverse rotation switching contact 10 and the motor 1 is started in the reverse direction.
When the motor 1 is started in the reverse direction, a lever (not shown) for storing energy in the closing spring is
The motor 1 operates in a direction opposite to the normal rotation direction.

As a result, the lever for storing energy in the closing spring returns to the initial position, and the contacts a and b of the start / stop contact 12 are mechanically switched to the motor 1. Of the reverse voltage is stopped, and the reverse drive of the motor 1 is stopped.

Here, the switch returns to the initial state, and
After the voltage is applied to the control power sources P and N, the auxiliary relay 2 is excited again via the rectifier 7, the contact a of the start / stop contact 12, and the reverse contact 13, and the closing spring is turned on in the same manner as described above. Starts storing energy input into the system.

When the input energy is thus stored, the reverse contact 13 is mechanically switched off, the excitation of the auxiliary relay 2 is released, and the contact 8 of the auxiliary relay 2 is turned off. , The contact 9 is turned on, the contact 11 is turned off, and the forward / reverse rotation switching contact 10 is switched to the contact b.

Next, since the contact b of the start / stop contact 12 is switched on in the same manner as when the voltages of the control power supplies P and N are lost, the rectifier 7, the start / stop contact 12
The motor 1 is connected via the contact b and the contact 9, the current limiting resistors 14 and 15, and the contact b of the forward / reverse rotation switching contact 10.
Is started in reverse.

Here, since the current limiting resistors 14 and 15 are added, it is possible to suppress a short circuit and an inrush current due to an arc between the contacts that are switched to the reverse start of the motor 1. Although the torque of the motor 1 is reduced by adding the current limiting resistors 14 and 15, there is no problem in the case of the reverse rotation start because there is no load. Also, when the motor 1 starts the reverse rotation start , the energy to the closing spring is
Lever (not shown) for accumulating energy
To start moving in the direction of the initial state.
In conjunction with the movement, the reverse contact 13 is mechanically turned on.

A lever (not shown) for accumulating energy in the closing spring operates in the direction opposite to the forward rotation of the motor 1, and a lever for accumulating energy in the closing spring. Returns to the initial position and waits. When the lever returns to the initial state, the switch is mechanically switched so that the contact b of the start / stop contact 12 is turned off, the voltage supply to the motor 1 is stopped, and the reverse drive of the motor 1 is stopped. Stop.

[0037]

As described above, according to the first aspect of the present invention, the start / stop contact for controlling the start / stop of the motor, and the motor is switched to the reverse operation when the energy is completely stored in the spring. A reverse contact is provided, and an auxiliary relay connected in series to a power supply together with the reverse contact and the start / stop contact is configured to perform forward / reverse control of the motor. By rotating, there is an effect that a loss of energy storage can be reduced and a mechanically simplified one can be obtained.

According to the second aspect of the present invention, when the energy stored in the spring by the forward rotation of the motor reaches a predetermined value, the motor is started reversely by the operation of the reverse rotation contact, and the next energy storage is performed. Since the energy storage lever is configured to return to the initial position and stand by for operation, after the energy storage of the spring is completed, the energy storage lever is returned to the initial state again, and the next energy storage lever is returned. This has the effect of obtaining something that can be put on standby for the start of a force.

According to the third aspect of the present invention, when the power supply is lost during the energy storage, the energy storage lever is once returned to the initial position, and the energy storage is restarted by inputting the power again. With this configuration, if power is lost during the energy storage in the spring, the power is restored to the initial state so that the motor load does not become excessive without restarting the energy storage from the middle when the power is restored. After that, there is an effect that an energy storage that can restart the energy storage is obtained.

According to the fourth aspect of the present invention, since the current limiting resistor is connected in the drive circuit of the motor,
When the motor is started reversely, there is an effect that a short circuit caused by an arc between the contacts and an inrush current of the motor circuit can be prevented or suppressed.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a switch control circuit according to an embodiment of the present invention.

FIG. 2 is a circuit diagram showing a conventional switch control device.

[Explanation of symbols]

1 motor, 2 auxiliary relays, 12 start / stop contacts, 13 reverse contact, 14, 15 current limiting resistors.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01H 33/28-33/59

Claims (4)

(57) [Claims] 1. A switch control device for turning on a switch using energy stored in a spring by forward rotation of a motor, comprising: a start / stop contact for controlling start / stop of the motor; A reverse contact for switching the motor to the reverse operation when the energy is completely stored in the spring, and the reverse contact and the start / stop contact are connected in series to a power supply to perform forward / reverse control of the motor. A switch control device comprising an auxiliary relay. 2. When the energy stored in the spring by the forward rotation of the motor reaches a predetermined value, the motor starts reverse rotation by the operation of the reverse contact, and the energy is stored for the next energy storage operation. 2. The control device for a switch according to claim 1, wherein the control lever is returned to an initial position and waits. 3. The opening and closing according to claim 1, wherein when the power is lost during energy storage, the energy storage lever is once returned to an initial position, and the energy storage is restarted by inputting power again. Control device. 4. The control device for a switch according to claim 1, wherein a current limiting resistor is connected in a drive circuit of the motor.