JP3919160B2 - Automatic recharging device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an automatic reclosing device that is attached to a wiring breaker and automatically recloses the wiring breaker when the wiring breaker trips.
[0002]
[Prior art]
The circuit breaker for wiring breaks the circuit by detecting an overcurrent, a short circuit, or a leakage of the load flowing in the wiring, thereby breaking the circuit. However, the cause of the trip is not necessarily a load overcurrent, a short circuit, or a leakage, but may be a transient malfunction due to lightning surge, vibration, electromagnetic waves, or the like. In particular, in a communication unmanned base station, etc., if a circuit breaker trips, it is necessary for a person to go to the unmanned base station. An automatic recharging device is used that automatically recloses the wiring breaker when the wiring breaker trips.
[0003]
In such an automatic restarting device, when the circuit breaker trips, if the cause of the trip is not overcurrent, it is turned on, and if it is tripped again, it is turned on again if the cause of the trip is not overcurrent. Yes. Then, when the trip is made again within a certain time, it is assumed that there is an abnormality in the load and the charging is stopped.
[0004]
However, in many electrical devices, an inrush current may flow when the power is turned on. This is due to the transient excitation current of the transformer incorporated in the electrical equipment and the charging current of the capacitor of the filter of the rectifier circuit, the magnitude of which depends on the power supply phase at the time of input. For this reason, when the power is turned on again, the circuit breaker may trip due to the overcurrent caused by the inrush current. With the conventional automatic re-turn-in device, if the overcurrent is caused by the inrush current at the time of re-turn-on, there is a problem that the state is not turned on as it is. It was. In addition, there is a problem that even when the power transmission on the power source side is stopped or restarted, it trips if it becomes an overcurrent due to an inrush current and is not reapplied.
[0005]
[Problems to be solved by the invention]
The present invention has been made in order to solve the above-described problems and to provide an automatic restarting device capable of restarting even if an inrush current flows during the restarting.
[0006]
[Means for Solving the Problems]
In order to solve the above problem, the automatic re-insertion device of the present invention includes a trip detection means for detecting a trip of a circuit breaker, a current detection means for detecting a current of a main circuit, a trip detection means and a current detection means. And a handle operating means for turning on the circuit breaker according to a closing signal output from the closing determination means. The closing determination means was not overcurrent at the time of trip. If the assumed that outputs on signal, further, turned determining means does not output the activation signal when were overcurrent trip time, turned judging means outputs when not a trip time overcurrent If not the overcurrent tripping after introduction of circuit breaker according to activation signal is not re-output the activation signal was assumed to re-output the activation signal when was trip time overcurrent And it is characterized in and. In addition, the closing judgment means shall output a breaker closing signal in the case of an overcurrent when tripping at the time of power recovery after a power failure, and a display means for displaying the judging factor of the closing determination means shall be provided. Is preferred.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment according to the automatic recharging apparatus of the present invention will be specifically described with reference to the drawings.
FIG. 1 is a block diagram showing an embodiment of the present invention. A recharging device according to the present invention is composed of a closing control device 1 and an electric operation mechanism 2, and the handle of the circuit breaker 3 is operated by the electric operation mechanism 2. The circuit breaker 3 is turned on by operating. The closing control device 1 is based on the trip detection circuit 6, the current detection circuit 5, the trip detection circuit 4 and the output of the trip detection circuit 6, which determines whether or not the circuit breaker can be closed. The handle control circuit 7 drives the electric motor of the electric operation mechanism 2.
[0008]
The closing determination circuit 6 is connected to the display circuit 8 so as to display the determination factor when the closing of the circuit breaker 1 is stopped, and the alarm output circuit 9 is connected to indicate that the circuit breaker 1 is not turned on. An alarm is issued. The trip detection circuit 4, the current detection circuit 5, the making determination circuit 6 and the like described above can be configured by a microprocessor. A power supply circuit 10 supplies power to each circuit.
[0009]
The circuit breaker 3 includes a main contact 10 that is opened and closed by operating a handle (not shown) and an auxiliary contact 11 that is closed when the main contact 10 is closed, and has a function of tripping due to a time limit characteristic when overcurrent occurs. It is what has. Moreover, it is good also as what has a function which trips at the time of electric leakage as needed. The auxiliary contact 11 is connected to the trip detection circuit 4, and the current transformer 12 provided in the main circuit is connected to the current detection circuit 5.
[0010]
In the above configuration, when the circuit breaker 3 trips, the main contact 10 opens and the auxiliary contact 11 opens simultaneously, and the trip detection circuit 4 sends a trip detection signal to the closing determination circuit 6. Further, the current detection circuit 5 monitors the current at the time of trip, and sends a signal as to whether or not there is an overcurrent to the making determination circuit 6. FIG. 2 is a flowchart showing an example of the operation of the closing determination circuit 6. As shown in FIG. 3, when the current changes and exceeds the set current indicated by the broken line, the circuit breaker trips at time T1 due to the time limit characteristic. The detection circuit 5 sends an overcurrent signal to the making determination circuit 6. The closing determination circuit 6 determines that an accident such as a short circuit or overload has occurred, determines that the breaker 3 is not turned on, and does not send a closing signal to the handle control circuit 7.
[0011]
If the current changes as shown in FIGS. 4 to 7 and trips at time T1 without overcurrent flowing, it is not overcurrent at the time of trip, so it is determined that the making determination circuit 6 is a transient malfunction. Make a decision to throw. The making determination circuit 6 sends a making signal to the handle control circuit 7, and the handle control circuit 7 drives the electric motor of the electric operation mechanism 2 to operate the handle to turn on the circuit breaker 3.
[0012]
If the circuit breaker 3 is turned on and no trip occurs as shown in FIG. 4, power supply to the load is continued. As shown in FIG. 5 or FIG. 6, when an overcurrent occurs and a trip occurs at time T2, since the overcurrent is generated at the time of trip, the making determination circuit 6 determines that the current is an inrush current and makes a decision to turn on. Then, the handle control circuit 7 turns on the circuit breaker 3. In addition, as shown in FIG. 7, when the trip occurs at a time T2 within a predetermined time indicated by a one-dot chain line without becoming an overcurrent, it is judged that there is some abnormality such as a leakage because it is not an overcurrent at the time of trip, so do.
[0013]
As shown in FIG. 5 or FIG. 6, the circuit breaker 3 is turned on after a trip at time T2, and if it does not trip as shown in FIG. 5, the power supply to the load is continued. As shown in FIG. 6, when an overcurrent occurs and the motor trips at time T3, it is determined that an accident has occurred, and it is determined that it will not be turned on thereafter. That is, it is based on the idea that the inrush current rarely repeats twice, and it is possible to turn off the current after 3 or 4 times.
[0014]
FIG. 8 is a flowchart showing another example of the operation of the making determination circuit 6. It is the same as that shown in FIG. 2 that the closing determination circuit 6 determines that a transient malfunction has occurred if the overcurrent is not present at the time of tripping, and the breaker 3 is turned on. As shown in FIG. 9 or FIG. 10, when a power failure occurs at time T1 and power is restored at time T2, an inrush current may flow at the time of power recovery. If an inrush current flows, the inrush current causes a time T3. Trip on. The on-off determination circuit 6 determines that the circuit breaker 3 is to be turned on if it is after a power recovery when it is an overcurrent at the time of a trip and is determined as an inrush current at the time of power recovery. In the case of an overcurrent at the time of a trip, if it is not after power recovery, it is the same as that shown in FIG. 2 that the closing determination circuit 6 determines that an accident has occurred and the breaker 3 is not switched on.
[0015]
As shown in FIG. 9 or FIG. 10, the circuit breaker 3 is turned on after a trip at time T3, and the power supply to the load is continued unless the trip occurs as shown in FIG. As shown in FIG. 10, when an overcurrent occurs and the motor trips at time T4, it is determined that an accident has occurred, and it is determined that it will not be turned on thereafter. The progress of the operation of the input determination circuit 6 in this part is the same as that shown in FIG.
[0016]
The display circuit 8 displays the current state, the presence / absence of an overcurrent at the time of tripping when not turned on, the cause of not being turned on, the number of times of turning on, and the like. This facilitates maintenance and inspection. The alarm output circuit 5 outputs an alarm indicating that the alarm output circuit 5 is not turned on. By sending this warning to the management department where the manager is stationed via a communication line or the like, the recovery can be performed quickly.
[0017]
【The invention's effect】
According to the present invention described above, even when a trip is caused by an inrush current at the time of re-entry after a trip due to a transient malfunction, it is judged and re-entered. Has the advantage of improving. In addition, even if a trip occurs due to an inrush current at the time of power recovery after a power failure, it is judged and re-introduced, so there is an advantage that it does not remain stopped at the time of power recovery after a power failure. Further, since the cause when the state is not turned on is displayed, the maintenance inspection becomes easy, and it is extremely large that it contributes to the industry as providing an automatic re-feeding device that solves all the conventional problems.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of the present invention.
FIG. 2 is a flowchart showing an operation of a making determination circuit.
FIG. 3 is a transition diagram showing an example of a change in current with respect to time.
FIG. 4 is a transition diagram showing an example of a change in current with respect to time.
FIG. 5 is a transition diagram showing an example of a change in current with respect to time.
FIG. 6 is a transition diagram showing an example of a change in current with respect to time.
FIG. 7 is a transition diagram showing an example of a change in current with respect to time.
FIG. 8 is a flowchart showing the operation of the making determination circuit.
FIG. 9 is a transition diagram showing an example of a change in current with respect to time.
FIG. 10 is a transition diagram showing an example of a change in current with respect to time.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Input control device 2 Electric operation mechanism 3 Circuit breaker 4 Trip detection circuit 5 Current detection circuit 6 Input determination circuit 7 Handle control circuit 8 Display circuit 9 Alarm output circuit 10 Power supply circuit 11 Auxiliary contact 12 Current transformer

Claims (3)

Trip detection means for detecting a trip of a circuit breaker, current detection means for detecting a current of a main circuit, a feed determination means for judging whether or not a circuit breaker can be turned on from the outputs of the trip detection means and the current detection means, and a feed determination means and a steering means for turning on the circuit breaker by an output on signal to the,-projecting input determining means does not output an on signal when were overcurrent trip time, if not the trip time overcurrent and outputs the on signal to the further-on determining means if not the overcurrent tripping after introduction of circuit breaker according turned signal turned judging means outputs when not the overcurrent tripping without re-output, it was assumed that re-output the activation signal when was trip time overcurrent automatic cycling device, wherein the activation signal is. It turned determining means, an automatic cycling device of claim 1, characterized in that the outputs of the on signal of the circuit breaker when was overcurrent when tripped upon power recovery after a power failure.   3. The automatic recharging apparatus according to claim 1, further comprising display means for displaying a determination factor of the charging determination means.

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