JPH10112237A - Electric operating device for circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect the contact point fused state of a circuit breaker, prevent the burning of a motor turning the circuit breaker on or off, and reports the contact point fused state. SOLUTION: When a remote control off-switch is depressed, a motor 4 is rotated to move a handle operation member 5 to the left, and an operation handle 2 is thrown down to the left by an operation lever 7 provided on the handle operation member 5 to turn a circuit breaker 1 off. When the contact point of the circuit breaker 1 is fused, a shift arm 8 provided on the handle operation member 5 is brought into contact with an isolation switch 9 during the on-to-off action, the motor 4 is restrained at the contact state position, and the handle operation member 5 cannot be moved. When the contact state of the isolation switch 9 continues for the set period or longer, the excitation to the motor 4 is stopped, and an alarm signal is sent out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
N, which relates to an electric operating device to be turned off.

[0002]

2. Description of the Related Art FIG. 9 is a schematic configuration diagram of an electric operation device, and FIG. 10 is a circuit configuration diagram of a conventional electric operation device disclosed in Japanese Patent Publication No. 62-17326, for example, in which a circuit breaker is OFF. FIG. 11 shows a state in which the circuit breaker is ON.
It is a figure showing a state.

In the figure, 1 is a circuit breaker, 2 is an operation handle of the circuit breaker 1, 3 is an electric operation device mounted on the operation handle 2 side of the circuit breaker 1, 4 is an operation drive motor, and 5 is an operation drive motor. It is a handle operation member, and reciprocates along the support shaft 6 in the directions of arrows A and B by the motor 4. Reference numeral 7 denotes an operation bar attached to the handle operation member 5, and pushes the operation handle 2 to turn on and off the circuit breaker 1 by reciprocating movement of the handle operation member 5. Reference numeral 20 denotes a circuit unit of the electric operation device.

In FIGS. 10 and 11, 21 is an ON switch, 22 is an OFF switch, 23 is a connection terminal, 26 is a relay for converting the polarity of the motor 4, 27 is an ON operation relay, 28 is an OFF operation relay, 29 is a rectifier, 33
Is a limit switch that switches in conjunction with the ON / OFF position of the handle 2 of the circuit breaker 1.

Next, the operation will be described. When the OFF switch 22 is pressed in the circuit breaker ON state in FIG. 11, a voltage is applied to a closed circuit of the connection terminal 23d → the OFF operation relay 28 → the switch 33 → the connection terminal 23a,
OFF operation relay 28 and motor polarity conversion relay 26
Are excited. OFF operation relay 2
8, the a contact 28a is closed and the b contact 28b is closed.
Is opened. In addition, the c contact 26c of the motor polarity conversion relay 26 switches to the terminal a.

Even if the OFF switch 22 is opened by closing the a contact 28a of the OFF operation relay 28, the closed circuit of the connection terminal 23b → a contact 28a → OFF operation relay 28 → switch 33 → connection terminal 23a The OFF operation relay 28 is held by itself.

The connection terminal 23a → rectifier 29 → ON
The power is applied to the closed circuit of the b contact 27b of the operation relay 27 → the terminal a of the c contact 26c → the motor 4 → the terminal a of the c contact 26c of the relay 26 → the rectifier 29 → the a contact 28a → the connection terminal 23b. Drives and turns the operation handle
It is driven to the F position, the switch 33 is switched, the OFF operation is completed, and the circuit breaker is turned off in FIG.

[0008]

In recent years, in order to ensure safety in a distribution line to which a circuit breaker is connected, when a contact of the circuit breaker is welded, the operating handle 2 is turned off.
A circuit breaker of a type that is restricted at an isolation position in the middle of OFF so as not to be operated to the FF position is used.

In other words, when a circuit breaker of the type restrained at the isolation position is causing contact welding,
When a remote OFF operation is performed by the above-described conventional electric operation device, the operation handle 2 is restrained in the middle of OFF, that is, in the isolation position. The OFF operation relay 28 continues to maintain the self-holding state.

Therefore, there is a problem that the restraining current continues to flow through the motor 4 and the motor 4 is burned. The motor 4
If there is another protection device that stops the flow of the constrained current to the motor 4 even when a foreign matter is caught in the drive system connected to the motor, it cannot be determined whether the motor 4 is stopped due to the isolation constrain. Was.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems.
It is an object of the present invention to provide an electric operating device that outputs an alarm signal for contact welding of a circuit breaker.

[0012]

[Means for Solving the Problems]

(1) An electric operating device according to the present invention is an electric operating device for a circuit breaker, in which the circuit breaker is turned on and off by driving a motor, when the contact of the circuit breaker is welded during the operation from ON to OFF. And a discriminating means for discriminating an abnormality when the switch is operated for a predetermined time or more.

(2) In an electric operating device of a circuit breaker for operating the circuit breaker ON / OFF by driving a motor, a drive current flowing through the motor during operation from ON to OFF is detected, and the drive current is detected. Is provided with a determining means for determining whether or not there is an abnormality in accordance with the size of.

(3) In the electric operating device of the circuit breaker for operating the circuit breaker ON / OFF by driving the motor, the position of the circuit breaker during the operation from ON to OFF is restricted when the contact is welded. An operating switch and a discriminating means for detecting a driving current flowing through the motor in accordance with the operation of the switch and discriminating whether or not there is an abnormality according to the magnitude of the driving current are provided.

(4) In an electric operating device of a circuit breaker for turning ON / OFF the circuit breaker by driving a motor, when the operation is changed from ON to OFF, a predetermined O is set.
When the motor drive current flows for more than the operation time from N to OFF, a discriminating means for discriminating an abnormality is provided.

(5) In any one of the above (1) to (4), when the discriminating means determines that there is an abnormality, the stopping means for stopping the energization of the motor and when the determining means determines that there is an abnormality, an alarm signal is issued. It is equipped with one or both of the alarm means for sending.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. FIG. 1 is a schematic configuration diagram of an electric operating device in an ON state according to Embodiment 1 of the present invention, FIG. 2 is a schematic configuration diagram of an OFF state, FIG. 3 is a schematic configuration diagram of an isolation position (restricted position), and FIG. FIG. 3 is a circuit configuration diagram of the operation device.

In the figure, 1 to 7, 20 to 23 are the same as those described in the above-mentioned conventional apparatus. Reference numeral 8 denotes a detection piece provided upright on the handle operation member 5 and moves left and right in the figure with the movement of the handle operation member 5. Reference numeral 9 denotes an isolation switch that engages with the detection piece 8 during the movement of the detection piece 8, and is turned on by the detection piece 8 only at the isolation position (restricted position) of the operation handle 2.

Reference numeral 10 denotes a timer which is energized only when the isolation switch 9 is turned on and operates after a predetermined time elapses. Reference numerals 10a and 10b denote contacts of the timer 10, the contact 10a is ON when the timer is activated, and the contact 10b is activated when the timer is activated. It is turned off. Reference numeral 11 denotes a changeover switch, and when the handle operation member 5 comes to the ON position and the OFF position, the motor 4
And switches the circuit in preparation for the next movement to the opposite side.

Reference numeral 12a denotes an ON-side self-holding circuit for continuously operating the motor 4 when the ON switch 21 is momentarily pressed, and 12b denotes an OFF-side self-holding circuit for continuously operating the motor 4 when the OFF switch 22 is momentarily pressed. Reference numeral 13 denotes a motor control circuit that controls the forward and reverse rotation of the motor 4 to reciprocate the handle operation member 5 in the directions of arrows A and B.

In this embodiment, the detection piece 8 is provided on the handle operation member 5, but it may be provided on a member interlocked with the movement of the operation handle 2, for example, the operation handle itself. In the above description, the detection piece 8 and the isolation switch 9 detect the restriction of the operation handle 2 at the isolation position.
However, it is apparent that the same effect can be obtained by using a photoelectric sensor. Since the isolation position (restraint position) differs depending on the type and type of the circuit breaker, the detection piece 8 or the isolation switch 9 is used.
The fixed position of can be changed.

Next, the operation will be described. First, when the circuit breaker 1 is in the ON state and no contact welding occurs, that is, in a normal state, when the OFF switch 22 is pressed, the motor 4 rotates through the OFF-side self-holding circuit 12b and the handle operation member is turned on. 5 is moved in the direction of arrow A, the operating handle 2 is set to the OFF position, the circuit breaker 1 and the electric operating device 3 shift from the state shown in FIG. 1 to the state shown in FIG. 2, the changeover switch 11 is changed over, and the ON switch 21 is changed. It is in a state of waiting for pressing of. While the handle operation member 5 is moving, the isolation switch 9 is momentarily switched by the detection piece 8, but the timer 10 does not operate because the switching time is short.

Next, when the OFF switch 22 is depressed while the circuit breaker 1 is welding contacts, the handle operation member 5 moves in the direction of arrow A as described above. Position (restraint position)
Therefore, the handle operation member 5 cannot move to the OFF position and stops at the isolation position (restriction position) shown in FIG.

At this time, the detection piece 8 of the handle operation member 5 keeps the isolation switch 9 in the ON state.
0 outputs an alarm signal of contact welding to the outside through the contact 10a, and interrupts the motor current by the contact 10b to prevent burning of the motor 4.

In general, the isolation position (restricted position) cannot be known unless the contact is welded. Therefore, the movable contact is restricted at the time of assembling the circuit breaker, and the latch for overcurrent release is performed. , The angle of the operation handle 2 stopped during the movement of the operation handle 2 to the OFF position is measured for each type of circuit breaker, and the detection piece 8 and the isolation switch 9 are engaged at this angle position. What is necessary is just to set it to be.

Embodiment 2 FIG. FIG. 5 is a circuit configuration diagram of an electric operating device according to Embodiment 2 of the present invention. FIG. 6 is a diagram showing the state of the current of the motor. In the configuration of the second embodiment, the welding piece 8 and the isolation switch 9 of the first embodiment are unnecessary, and the contact welding is detected. The operation handle 2 passes near the isolation position (restricted position). The motor current is normal
It is determined whether the current is in a state where the motor 4 is in a restricted state.

In FIG. 5, 4, 11-13, and 20-2
3 is the same as that described in the first embodiment. 14
Is a T1 timer set to a time t1 which is slightly longer than a time when the motor starting current is settled when the motor 4 starts and the handle operation member 5 starts moving after the OFF switch 22 is pressed, and 14a is a contact of the timer. is there.

Reference numeral 15 denotes a T2 timer in which the operation handle 2 is set to a time t2 slightly longer than the end time of the isolation restriction range position, and 15b denotes a contact point thereof. That is, t
The time t0 in the range of 2-t1 specifies the range of the isolation position.

Reference numeral 16 denotes a T3 timer set to a time t3 slightly longer than the total time of the OFF operation, 17 denotes a resistor for converting the motor current into a voltage, and 18 denotes whether or not a value obtained by converting the motor current into a voltage is within a reference value. Motor current discriminating circuit for discriminating
Reference numeral 19 denotes a relay that is excited when the motor current is equal to or more than a reference value, and 19a denotes a contact thereof.

Next, the operation will be described. First, when the circuit breaker 1 is in the ON state and no contact welding occurs, that is, when the OFF switch 22 is pressed in a normal state, the circuit breaker 1 is turned on as described in the first embodiment.
The electric operating device 3 shifts from the state shown in FIG. 1 to the state shown in FIG.
It is in a state of waiting for pressing of.

Here, after the OFF switch 22 is depressed, the timers 14, 15, and 16 start to be excited, and the OFF-side self-holding circuit 12 is switched until the changeover switch 11 is switched.
b. Therefore, after t1 seconds, T1 timer 1
4 contact 14a is switched, and after t2 seconds, the T2 timer 15
Is switched, the motor current discriminating circuit 18 via the resistor 17 determines whether the motor current has exceeded the reference value from the time t1 to the time t2 after the OFF switch 22 is pressed.

In the case of normal operation, the motor current has the current value shown by the solid line in FIG. 6 and is smaller than the reference value. Therefore, the relay 19 is not excited and the contact 19a remains open. No contact welding alarm is issued. Also, O
When the FF operation is completed, the changeover switch 11 is switched, and O
The FF side self-holding circuit 12a is released, and the timer 14,
The excitation of 15 and 16 is released, and the T3 timer 16 does not operate.

Next, OFF when contact welding is occurring.
When the switch 22 is pressed, a motor restraining current flows in the isolation position range, so that the motor current value exceeds the reference value from t1 seconds to t2 seconds.
This is determined by the motor current determination circuit 18, and an alarm signal for contact welding is output to the outside via the relay 19.

When the changeover switch 11 is not switched after a time t3 seconds slightly longer than the normal OFF operation time, that is, when an abnormality other than the welding of the contacts occurs, the T3 timer 16 operates and the contacts 16b are set. When turned off, the motor current is interrupted to prevent the motor 4 from burning.

Embodiment 3 FIG. This embodiment is a combination of the first embodiment and the second embodiment, and uses the configuration diagram of the first embodiment shown in FIG. 1 and partially replaces the circuit shown in FIG. 5 of the second embodiment. It has been changed. FIG.
FIG. 7 is a schematic configuration diagram illustrating an ON state of the electric operation device according to the third embodiment.

As shown in FIG. 1, the isolation switch 9 operates in the isolation position (restricted position). Therefore, as shown in FIG. When the current of the motor 4 is detected by 18 and the current is larger than the reference value and continues for a timer set time or more, the relay 19 is determined to be in the contact welding state, the relay 19 is operated, and the power supply to the motor is stopped at the contact 19b. At 19a, an alarm signal is transmitted.

Embodiment 4 FIG. This embodiment is a modification of the third embodiment, which is a combination of the first and second embodiments, as in the third embodiment. That is, the configuration shown in FIG. 1 of the first embodiment is used, and the circuit shown in FIG. 5 of the second embodiment is partially modified. FIG. 8 is a schematic configuration diagram showing an ON state of the electric operation device according to the fourth embodiment.

As shown in FIG. 1, the isolation switch 9 operates at the isolation position (restricted position). Therefore, when the contact of the isolation switch 9 is turned on as shown in FIG. When the current of the motor 4 is detected by 18 and the current is larger than the reference value and continues for a set time of the timer, it is determined that the contact is welded, the relay 19 is operated, and an alarm signal is sent out at the contact 19a.

On the other hand, the T3 timer 16 is changed from ON to OFF.
When the operation time exceeds the operation time, the operation is performed when the contact is welded, the contact 16b is turned off, and the power supply to the motor is stopped. Also, even if the operation from ON to OFF is stopped except for the welding of the contacts, the motor drive current continues to flow.
The T3 timer 16 stops energizing the motor when the timer set time has elapsed.

[0040]

As described above, according to the present invention, when the circuit breaker causes contact welding or when an abnormality other than contact welding occurs, the motor does not operate even if the electric operating device is turned off. An electric operating device for circuit breakers that is safer and has higher maintenance because it outputs an alarm signal without burnout and detects that the circuit breaker has caused contact welding or an abnormality other than contact welding. The effect is obtained.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an ON state of an electric operating device according to Embodiment 1 of the present invention.

FIG. 2 is a schematic diagram showing an OFF state of the electric operating device according to the first embodiment of the present invention.

FIG. 3 is a configuration diagram showing an isolation position (restriction position) of the electric operating device according to the first embodiment of the present invention.

FIG. 4 is a circuit configuration diagram of the electric operating device according to the first embodiment of the present invention.

FIG. 5 is a circuit configuration diagram of an electric operation device according to a second embodiment of the present invention.

FIG. 6 is a diagram showing a current state of a motor according to a second embodiment of the present invention.

FIG. 7 is a circuit configuration diagram of an electric operation device according to a third embodiment of the present invention.

FIG. 8 is a circuit configuration diagram of an electric operating device according to Embodiment 4 of the present invention.

FIG. 9 is a schematic configuration diagram of a conventional electric operation device.

FIG. 10: Circuit breaker OFF of conventional electric operating device
FIG. 3 is a circuit configuration diagram showing a state.

FIG. 11 is a circuit diagram showing an ON state of a circuit breaker of a conventional electric operating device.

[Explanation of symbols]

1 circuit breaker, 2 operating handle, 3
Electric operating device, 4 motor, 5 handle operation member, 6 support shaft, 7 operation bar
8 Detection piece, 9 Isolation switch, 10 Timer 11 Changeover switch, 12a ON side self-holding circuit, 12b OFF side self-holding circuit, 13 Motor control circuit, 14 T1 timer, 15 T2
Timer, 16 T3 timer 18 Motor current discrimination circuit, 19 Relay, 21
ON switch, 20 Circuit section of electric operating device, 22
OFF switch.

Claims (5)

[Claims] 1. A circuit breaker is turned on and off by driving a motor.
In an electric operating device for a circuit breaker operated by FF,
A circuit breaker, comprising: a switch that operates at a restrained position when the circuit breaker is welded at a point of contact during the operation from N to OFF, and a determination unit that determines that the switch is abnormal when the switch is operated for a predetermined time or more. Electric operating device of the vessel. 2. A circuit breaker is turned on and off by driving a motor.
In an electric operating device for a circuit breaker operated by FF,
An electric operation of a circuit breaker, comprising: a drive current flowing through the motor during an operation from N to OFF, and a determination unit configured to determine whether or not there is an abnormality according to the magnitude of the drive current. apparatus. 3. The circuit breaker is turned on and off by driving a motor.
In an electric operating device for a circuit breaker operated by FF,
A switch that operates at a restrained position when the circuit breaker is welded to a contact point during the operation from N to OFF, and a drive current flowing through the motor in response to the operation of the switch,
An electric operating device for a circuit breaker, further comprising a determining means for determining whether or not an abnormality is present according to the magnitude of the driving current. 4. The circuit breaker is turned on and off by driving a motor.
In an electric operating device for a circuit breaker operated by FF,
When operating from N to OFF, the preset ON to OF
An electric operating device for a circuit breaker, further comprising: a determining unit that determines that an abnormality has occurred when a motor drive current flows for more than an operation time for the motor. 5. The electric operating device for a circuit breaker according to claim 1, wherein when the determining means determines that there is an abnormality, the stopping means for stopping power supply to the motor and the determining means determine that there is an abnormality. An electric operating device for a circuit breaker, comprising one or both of alarm means for sending an alarm signal.