JPH0837720A - Automatic safety circuit breaker - Google Patents

Abstract

PURPOSE:To provide an automatic safety circuit breaker which is constituted in such a way that, when the breaker is actuated due to lightning, overload, etc., the breaker is automatically restored and, at the same time, the cause of the actuation is discriminated on the load side and the breaker is continuously used when safety is secured or the restoring operation of the breaker is stopped when a load is abnormal. CONSTITUTION:An automatic safety circuit breaker is provided with a circuit breaker detector 2 which detects the actuated state or restoring state of a circuit breaker 1, circuit breaker restoring device 3 which restores the breaker 1 from an actuated state in accordance with the signal of the detector 2, and circuit breaker controller 4 which stops the restoring function of the restoring device 3 when the breaker 1 is actuated a prescribed number of times within a prescribed period of time after the fist actuation of the breaker 1. The controller 4 is initialized when a prescribed period of time has elapsed after the restoring device 3 first restores the breaker 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention automatically resets the breaker when it breaks due to lightning or overload, and determines the cause of breaker break on the load side. The present invention relates to an automatic safety breaker that stops return operation.

[0002]

2. Description of the Related Art For example, when a breaker is cut off at a relay station of a broadcasting station, a construction engineer must go to a recovery work even if the breaker is temporarily cut off by lightning. In order to save such trouble, the circuit may be automatically reset using a no-fuse breaker.However, if the breaker is cut off due to an abnormal load such as an overload or a short circuit, this automatic reset is refrained from. Be prepared to investigate and repair the cause.

Further, when the breaker is cut off due to lightning or the like, if the breaker is automatically returned to the original energized state, the work of restoration by a construction worker is unnecessary.

[0004]

Therefore, it is necessary to automatically detect whether the breaker is cut off due to lightning or abnormal load.

The present invention has been made in view of the above circumstances, and when a breaker is cut off due to lightning, overload, or the like, the breaker is automatically restored and the cause of the breaker cutoff on the load side is determined to ensure safety. The purpose of the present invention is to provide an automatic safety breaker which is used continuously in the case of, and stops the return operation of the breaker in the case of an abnormal load.

[0006]

In order to achieve the above object, an automatic safety breaker of the present invention is provided with a breaker detection device for detecting a breaker cut-off or a return condition, and a breaker detection device for detecting a breaker state by a signal from the breaker detection device. A breaker return device for returning the breaker, and a breaker control device for stopping the return function of the breaker return device when a breaker interruption occurs a predetermined number of times within a predetermined time after the breaker first returns. Further, the breaker control device is characterized in that the breaker control device is set to an initial state when a predetermined time has passed from the first return of the breaker return device.

[0007]

With the configuration of the present invention, when the breaker is cut off due to lightning or overload, it is automatically returned by the start-up operation of the breaker return device, and after the first return of the breaker, a predetermined number of times is reached. If the breaker breaks off, it is judged to be due to an abnormal load,
If the breaker's returning operation is stopped, otherwise, it is judged to be safe, and after a predetermined time has elapsed, the circuit can be returned to the initial state and ready for automatic return control again.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the structure of an automatic safety breaker according to the present invention. FIG. 2 is a circuit diagram of the automatic safety breaker of FIG. FIG. 3 is a flow chart regarding control specifications of the automatic safety breaker of the present invention. FIG.
7 to 7 are time charts showing modes of start-up control of the breaker in the present invention.

The overall structure of the automatic safety breaker shown in FIG. 1 is composed of a breaker detecting device 2 for detecting the breaking or returning state of the breaker 1, and a breaker for returning the breaking circuit 1 in response to a signal from the breaker detecting device 2. After the first return of the return device 3 and the breaker 1, when the breaker interruption occurs a predetermined number of times (for example, 3 times) within a predetermined time (for example, 3 hours), the return function of the breaker return device 3 is stopped. The breaker control device 4 is provided with the breaker control device 4, and the breaker control device 4 is brought into the initial state when a predetermined time has passed from the first return of the breaker return device 3.

In such a structure, the breaker 1
A well-known one called a no-fuse breaker can be used for the power source side (AC: IN) and the load side (A:
C: OUT). The operation handle 1a protruding outside the breaker 1 is on the ON (rising) side of FIG. 1 when energized, and when the circuit is cut off, the operation handle 1a of FIG.
Tilt to the OFF (cutoff) side.

An operating element 3a of a solenoid 3 which is a breaker returning device is connected to the operating handle 1a,
A driver 5 as a drive source is connected to the solenoid 3. When the operation handle 1a of the breaker 1 is tilted to the OFF side due to some overload as described above, the operator 3a of the solenoid 3 pulls the operation handle 1a to the ON side by the electromagnetic force generated by the driver 5. Operate to return to the startup state.
The driver 5 of the solenoid 3 is connected to the CPU 4 which is a breaker control device and, as will be described later, the solenoid 3
The control relating to the return operation of is performed.

Further, the breaker 1 is provided with a micro switch 2 which is a breaker detecting device. For the micro switch 2, the operation handle 1a of the breaker 1 is OF
The actuator 2a of the micro switch 2 is installed so as to be activated when it is tilted to the F side, and at this time, a breaker 1 cutoff signal is sent to the CPU 4 connected to the micro switch 2.

Here, the CPU (breaker control device) 4
The CPU 4 has a clock means and a counting means for receiving the breaker return signal sent from the breaker detection device 2 and counting the number of times the breaker 1 is returned. A break signal is sent to the breaker returning device 3 when the breaker is interrupted again after the breaker returning is performed a predetermined number of times (for example, 3 times) within 3 hours, and the breaker returning device 3 is also activated. The counting means is programmed to be cleared to zero when a predetermined time has passed from the first return of the.

Further, in FIG. 1, the CPU 4 has an LED 1 for displaying a power source (green lighting) and an LED 2 for displaying an abnormality.
(Red light) is connected. CPU4 is on the power supply side (A
As a result of being connected to C: IN and receiving power supply, it is not affected by the breaker 1 being cut off. However, the normal state of the power supply is indicated by the green lighting of the LED 1, and the breaker 1 is cut off for a predetermined time (for example, 3 hours). ) Within a predetermined number of times (eg 3
When the breaker is turned off (twice), it is judged that the breaker is due to an abnormal load, and the LED 2 is turned on in red.

In FIG. 1, the power source side (AC: I
A high-voltage transformer 6 and a stabilizing power supply 7 for supplying appropriate power to the CPU 4 are connected between N) and the CPU 4. Reference numeral 8 is a reset switch for activating the CPU 4 after the breaker is stopped due to an abnormal load and after the recovery is completed.

FIG. 2 is a circuit diagram in which the above block circuit is embodied, and each part corresponds to the number of the component or device shown in FIG.

FIG. 3 is a flow chart showing the control specifications of the automatic safety breaker of the present invention.

In FIG. 3, "initial setting" is the breaker 1
Is normal, and the operation handle 1a of the breaker 1 is in a state of being raised to the ON side. Further, the counting means of the CPU 4 is not activated at this time and is in a zero count state, and the clock means is not activated for a predetermined time (30 minutes).

When some overload occurs on the load side of the breaker 1, the operation handle 1a of the breaker 1 is provided.
Leans toward the OFF side.

At this time, the "breaker state detection" is performed by activating the microswitch 2 which is a breaker detecting device, and at the same time when a breaker cutoff signal is sent to the CPU 4, the CPU 3 activates the solenoid 3 which is a breaker returning device. The operation handle 1a of the breaker 1 is ON
It is launched to the side.

"Breaker ON" is the start-up operation after the breaker is cut off. At this time, the counting means of the CPU 4 is activated and the first breaker start-up count is counted. At this time, at the same time, the clock means is activated for a predetermined time (30 minutes).

When the breaker 1 is returned to the ON side by the activation of the operation handle 1a, the breaker 1 is temporarily cut off due to lightning or the like.
If there is no other abnormal load, the breaker 1 can continue the return state and can be used normally thereafter. Therefore,
In the case of breaker interruption due to lightning protection, the breaker 1 automatically returns and no repair work by a construction worker or the like is required.

In the above, the number of times of breaker interruption due to lightning strike is possibly up to 3 times within 30 minutes, and if there is another breaker interruption after starting up 3 times within 30 minutes, the breaker interruption It is decided that the cause is most likely due to another abnormal load.
Therefore, the predetermined time or the predetermined number of times may be appropriately set according to the situation (season of lightning, place where lightning is likely to occur, etc.).

In the above case, if the interruption does not occur again within a predetermined time (30 minutes) after the initial start-up, the counting means for waiting 5 seconds to prevent chattering and counting the number of interruptions is set to zero. Clear and restore the default settings.

By the way, if the first breaker interruption is due to an abnormal load on the load side, the breaker interruption may occur again due to the same cause even after the first breaker restoration. In such a case, when there is a predetermined number of times (3 times) of interruption within a predetermined time (30 minutes) from the initial start-up, the CPU 4 judges that the breaker has been interrupted due to an abnormal load, and sends a stop signal to the breaker reset device 3. Send ("breaker OF
F ") It is designed to prevent the breaker from returning for the fourth time. In this case, the abnormality display LED 2 is lit in red to notify the abnormality, and after the restoration work, after the load side is made normal,
Turn on the reset switch 8 to restart.

FIGS. 4 to 7 show four cases of breaker cutoff control judgment. That is, although various phenomena can be considered as the phenomenon in which the breaker drops, the four typical phenomena are shown as a time chart.

In FIGS. 4 to 7, the predetermined time for zero clearing the count is 30 after the first breaker is started up.
Minutes, T1, T2, and T3 indicate the time from the start-up of the breaker 1 to the next interruption. Therefore, from these time charts, it is possible to find the time from the start of each breaker within the predetermined time of 30 minutes to the next interruption.

In case 1 (FIG. 4), the load (amplifier) or the like is internally damaged, the temperature rises gradually due to an increase in current, etc., and the cycle is interrupted from T1, T2, and T3 (time until interruption). This is the case when the speed becomes faster, and eventually it is completely destroyed.

Case 2 (FIG. 5) is a case where T1, T2 and T3 are short, and the load is short-circuited or damaged enormously, so that even if the breaker 1 is started up, the circuit is immediately cut off again. is there.

Case 3 (FIG. 6) is a case where the breaker 1 shuts off at random intervals rather than at constant intervals. In this case, it is judged that the breaker has been shut down due to lightning strikes, etc., and the breakers should be started up three times within 30 minutes.

Case 4 (FIG. 7) shows the case where the breaker is cut off under various conditions as in the above, but it is restored to the normal state by the second breaker startup.
If there is no interruption after 30 minutes from the initial startup, the count can be cleared to zero from the point of 30 minutes to prepare for the next action.

[0033]

As described above, the automatic safety breaker of the present invention, when the breaker is cut off due to lightning, overload, or the like, it is automatically returned by the start-up operation of the breaker return device, and the first breaker If a breaker breaks a predetermined number of times within a predetermined time after returning, it is judged that the breaker has broken due to an abnormal load, and the breaker return operation is stopped.If not, it is judged to be safe, and after a predetermined time has passed, The initial state can be set up for the automatic return control again.

Therefore, even if the breaker is cut off at a relay station of a broadcasting station in a remote place, if the breaker is temporarily cut off due to lightning or the like, the breaker will automatically return to safe operation.
No recovery work is required, and it is sufficient to go to the recovery work only when the load is cut off due to an abnormal load, which is very effective in reducing labor compared with the conventional method.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an automatic safety breaker according to the present invention.

FIG. 2 is a specific circuit diagram of the block diagram of FIG.

FIG. 3 is a flowchart regarding control specifications of the automatic safety breaker of the present invention.

FIG. 4 is a time chart showing a case 1 of a mode of startup control of a breaker according to the present invention.

FIG. 5 is a time chart showing a case 2 of a mode of startup control of a breaker according to the present invention.

FIG. 6 is a time chart showing a case 3 of a mode of startup control of a breaker according to the present invention.

FIG. 7 is a time chart showing a case 4 of an aspect of breaker startup control in the present invention.

[Explanation of symbols]

1 ... Breaker, 2 ... Breaker detection device (micro switch), 3 ... Breaker reset device (solenoid), 4
... Breaker controller (CPU).

Claims (1)

[Claims] 1. A breaker detecting device (2) for detecting a breaking or returning state of a breaker (1), and a breaker returning device for returning the breaking state of the breaker (1) by a signal from the breaker detecting device (2). (3) and a breaker control device for stopping the resetting function of the breaker resetting device (3) when a breaker is interrupted a predetermined number of times within a predetermined time after the breaker (1) first returns. 4) and the breaker control device (4) further comprises the breaker return device (3).
An automatic safety breaker characterized by being set to an initial state when a predetermined time has passed from the first return of.