JP2023046889A - Determination device, automatic resupply device, breaker with automatic resupply function and program - Google Patents

Abstract

To provide a determination device capable of improving determination accuracy for determining whether or not a factor which brings a breaker into a trip state is overcurrent, an automatic resupply device, a breaker with automatic resupply function and a program.SOLUTION: A determination device 4 comprises: a current detection unit 41 which detects whether or not a current value to be electrified to a breaker 2 exceeds a predetermined threshold; a handle position detection unit 42 which detects whether or not a handle 23 of the breaker 2 is in an open state; and a determination unit 44 for determining that a cause which brings the breaker 2 into a trip state is overcurrent. The current detection unit 41 is configured to hold a current detection signal indicating that the current value exceeds the predetermined threshold for a predetermined time after the current value exceeds the predetermined threshold. The determination unit 44 determines whether or not the factor which brings the breaker 2 into the trip state is overcurrent based on the current detection signal and a handle opening/closing signal indicating the detection that the handle 23 of the breaker 2 is in the open state.SELECTED DRAWING: Figure 2

Description

TECHNICAL FIELD The present invention relates to a determination device, an automatic re-closing device, a circuit breaker with an automatic re-closing function, and a program.

A circuit breaker is a safety device that automatically cuts off a load from a circuit by detecting excessive current flowing in an electric circuit, and is installed in various facilities. In addition, for circuit breakers installed in facilities where a manager is not stationed, for example, an automatic re-closing device is used that can automatically reset the breaker handle in the event of interruption due to transient noise, etc. (See Patent Document 1).

In the automatic re-closing device as described in Patent Document 1, when the circuit breaker is in an interrupted state (tripped state), if the cause of the tripped state is not an overcurrent, the breaker handle is operated and tripped. is released, that is, re-entered.

JP 2003-032874 A

However, the conventional automatic recloser has room for improving the accuracy of determining whether or not the circuit breaker has been tripped due to overcurrent.

Therefore, the present invention provides a determination device, an automatic re-closing device, a circuit breaker with an automatic re-closing function, and a program capable of improving the accuracy of determining whether the cause of the circuit breaker trip is overcurrent. intended to provide

In order to achieve the above object, the determination device of the present invention includes:
a current detection unit that detects whether or not the value of current flowing through the circuit breaker exceeds a predetermined threshold;
a handle detection unit that detects whether the handle of the circuit breaker is in an open state;
a determination unit that determines whether or not the circuit breaker is in a trip state due to overcurrent;
with
The current detection unit is configured to hold a first detection signal indicating that the current value exceeds the predetermined threshold for a predetermined time after the current value exceeds the predetermined threshold,
Based on the first detection signal and a second detection signal indicating that the handle of the circuit breaker is in an open state, the determination unit determines that the cause of the trip state of the circuit breaker is overcurrent. It is determined whether or not.

Further, the determination device of the present invention is
a current detection unit that detects whether or not the value of current flowing through the circuit breaker exceeds a predetermined threshold;
a voltage detection unit that detects the presence or absence of voltage on the secondary side of the circuit breaker;
a determination unit that determines whether or not the circuit breaker is in a trip state due to overcurrent;
with
The current detection unit is configured to hold a first detection signal indicating that the current value exceeds the predetermined threshold for a predetermined time after the current value exceeds the predetermined threshold,
Based on the first detection signal and a third detection signal indicating that the voltage on the secondary side of the circuit breaker is not detected, the determination unit determines that the cause of the trip state of the circuit breaker is excessive. It is determined whether or not there is a current.

Further, the determination device of the present invention is
a current detection unit that detects whether or not the value of current flowing through the circuit breaker exceeds a predetermined threshold;
a handle detection unit that detects whether the handle of the circuit breaker is in an open state;
a voltage detection unit that detects the presence or absence of voltage on the secondary side of the circuit breaker;
a determination unit that determines whether or not the circuit breaker is in a trip state due to overcurrent;
with
The current detection unit is configured to hold a first detection signal indicating that the current value exceeds the predetermined threshold for a predetermined time after the current value exceeds the predetermined threshold,
The determination unit provides the first detection signal, the second detection signal indicating that the handle of the circuit breaker is in an open state, and the voltage on the secondary side of the circuit breaker not being detected. Based on at least one of the third detection signals, it is determined whether or not the circuit breaker is tripped due to overcurrent.

In addition, the automatic re-insertion device of the present invention is
the determination device;
a handle holder attached to the handle of the circuit breaker;
a control unit that controls the operation of the handle holder based on the determination result of the determination device;
Prepare.

Further, the circuit breaker with an automatic re-closing function of the present invention is
The automatic reclosing device and the circuit breaker are provided.

Further, the program of the present invention is
A program for causing a determination device comprising a current detection unit, a steering wheel detection unit, and a determination unit to execute the following processing,
causing the current detection unit to detect whether or not the current value passing through the circuit breaker exceeds a predetermined threshold value, and for a predetermined time after the current value exceeds the predetermined threshold value, the current value exceeds the predetermined threshold value; holding a first detection signal indicating that the
causing the handle detection unit to detect whether or not the handle of the circuit breaker is in an open state;
Based on the first detection signal and a second detection signal indicating that the handle of the circuit breaker has been detected to be in the open state, the judging unit determines that the cause of the trip state of the circuit breaker is overcurrent. a step of determining whether or not
Execute the process including

Further, the program of the present invention is
A program for causing a determination device including a current detection unit, a voltage detection unit, and a determination unit to execute the following processing,
causing the current detection unit to detect whether or not the current value passing through the circuit breaker exceeds a predetermined threshold value, and for a predetermined time after the current value exceeds the predetermined threshold value, the current value exceeds the predetermined threshold value; holding a first detection signal indicating that the
causing the voltage detection unit to detect the presence or absence of voltage on the secondary side of the circuit breaker;
Based on the first detection signal and a third detection signal indicating that the voltage on the secondary side of the circuit breaker is not detected, the determination unit determines that the cause of the trip state of the circuit breaker is excessive. a step of determining whether it is current;
Execute the process including

Further, the program of the present invention is
A program for causing a determination device including a current detection unit, a steering wheel detection unit, a voltage detection unit, and a determination unit to execute the following processing,
causing the current detection unit to detect whether or not the current value passing through the circuit breaker exceeds a predetermined threshold value, and for a predetermined time after the current value exceeds the predetermined threshold value, the current value exceeds the predetermined threshold value; holding a first detection signal indicating that the
causing the handle detection unit to detect whether or not the handle of the circuit breaker is in an open state;
causing the voltage detection unit to detect the presence or absence of voltage on the secondary side of the circuit breaker;
The first detection signal, the second detection signal indicating that the handle of the circuit breaker is in the open state, and the voltage on the secondary side of the circuit breaker being not detected in the determination unit. determining whether or not the circuit breaker is tripped due to overcurrent based on at least one of the third detection signals;
Execute the process including

ADVANTAGE OF THE INVENTION According to the present invention, a determination device, an automatic re-closing device, a circuit breaker with an automatic re-closing function, and a program that can improve the accuracy of determining whether or not the circuit breaker is in a trip state due to overcurrent. can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which shows an example of the circuit breaker with an automatic re-closing function which concerns on embodiment of this invention. It is a functional block diagram of a circuit breaker with an automatic re-closing function. 4 is a flowchart for determining whether or not the cause of a trip state is overcurrent based on a current detection signal and a steering wheel opening/closing signal; 4 is a flowchart for determining whether or not the cause of a trip state is overcurrent based on a current detection signal and a voltage non-detection signal; 4 is a flowchart for determining whether or not the cause of a trip state is overcurrent based on a current detection signal, a steering wheel open/close signal, and a voltage non-detection signal; (a) to (e) are time charts showing a first determination example when a current detection signal is continuously output for a predetermined time. (a) to (e) are time charts showing a second determination example when the current detection signal is continuously output for a predetermined time. (a) to (e) are time charts showing determination examples when a current detection signal is not output. (a) to (e) are time charts showing examples of comparison and determination when the current detection signal is not continuously output.

Hereinafter, embodiments of a determination device, an automatic re-closing device, a circuit breaker with an automatic re-closing function, and a program thereof according to the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a configuration diagram of a circuit breaker 1 with an automatic re-closing function according to this embodiment. As shown in FIG. 1 , the circuit breaker 1 with an automatic re-closing function includes a circuit breaker 2 and an automatic re-closing device 3 . The circuit breaker 1 with an automatic re-closing function detects overcurrent, overvoltage, earth leakage, etc. occurring in the circuit breaker 2, and automatically re-closes the circuit breaker 2 that has been tripped and turned off based on the detection result. It is a circuit breaker that can In this embodiment, a single-phase three-wire circuit breaker having voltage lines L1 and L2 wired at both ends and a neutral wire N wired at the center will be described.

The circuit breaker 2 has a power supply side (primary side) terminal block 21, a load side (secondary side) terminal block 22, and a handle 23 arranged therebetween.
The power supply terminal block 21 is provided with power supply terminals 21a, 21b, and 21c. The load-side terminal block 22 is provided with load-side terminals 22a, 22b, and 22c. A voltage line L1, a neutral line N, and a voltage line L2 are connected in corresponding order to the power supply terminals 21a, 21b, 21c and the load terminals 22a, 22b, 22c. Current sensors 24a and 24b for measuring currents flowing through the voltage lines L1 and L2 are connected to the voltage lines L1 and L2 connected to the load terminals 22a and 22c.

The handle 23 is configured to be changeable between an open state and a closed state. The open state of the handle 23 is a state in which the power supply side contacts of the power supply side and the load side contacts of the load side in the circuit breaker 2 are not in contact with each other, and the voltage lines L1 and L2 and the neutral line N of the power supply side are connected. , the voltage lines L1 and L2 on the load side and the neutral line N are not electrically connected. The closed state of the handle 23 is a state in which the power supply side contact on the power supply side and the load side contact on the load side in the circuit breaker 2 are in contact, and the voltage lines L1 and L2 on the power supply side, the neutral line N, It refers to a state in which the voltage lines L1, L2 and the neutral line N on the load side are electrically connected. The handle 23 is, for example, configured to be vertically movable in FIG. For example, the handle 23 turns on the circuit breaker 2 by moving upward, and turns the circuit breaker 2 off by moving downward.

When a current exceeding a predetermined threshold continues to flow through the voltage lines L1, L2 or the neutral line N on the load side for a predetermined period of time, the circuit breaker 2 trips the power supply side by a trip operation of a trip coil (not shown). and the load side contact of the load side are configured to be in a non-contact state. In the circuit breaker 2, the power supply side contacts of the power supply side and the load side contacts of the load side are in a non-contact state, so that the power supply side voltage lines L1 and L2, the neutral line N, and the load side voltage lines L1 and L1 are connected. L2 and the neutral line N are configured to be in a non-conducting state to trip. The predetermined time is set so that the larger the current, the faster the operation. For example, the predetermined time is short for large currents such as short-circuit currents, longer for currents of a level such as inrush currents when switching on, and longer than for short-circuit currents. In the case of a current that exceeds the threshold, it is set longer.

The automatic reinsertion device 3 has a handle holding portion 31 and a drive portion 51 (described later with reference to FIG. 2) that drives the handle holding portion 31 . The handle holding portion 31 is attached so as to hold the handle 23 of the circuit breaker 2 . The handle holding portion 31 is driven by the drive portion 51, and is configured to be movable in the vertical direction indicated by the arrow A in FIG. 1, for example. For example, the handle holding portion 31 moves from the lower side to the upper side to move the held handle 23 from the lower side to the upper side to change from the open state to the closed state. Thereby, the handle|steering-wheel holding|maintenance part 31 can turn on the circuit breaker 2 which tripped and was turned off.

FIG. 2 is a functional block diagram of the circuit breaker 1 with an automatic re-closing function.
As shown in FIG. 2, the automatic reconnection device 3 includes a determination device 4, a handle holding portion 31, a handle control portion 32, a display portion 33, a notification portion 34, a storage portion 35, and a power supply portion 36. , has The determination device 4 includes a current detection section 41 , a handle position detection section 42 (an example of a handle detection section), a voltage detection section 43 and a determination section 44 . Note that the handle position detector 42 is included in the handle controller 32 .

The determination device 4 determines whether or not the circuit breaker 2 is in a trip state, and if it is in a trip state, determines whether or not the cause of the trip state is an overcurrent. It is a device. The current detection section 41, the handle position detection section 42, and the voltage detection section 43 of the determination device 4 are connected to the determination section 44 so as to be able to communicate with each other.

The current detector 41 is connected to the current sensors 24a and 24b. Current values measured by the current sensors 24 a and 24 b are input to the current detection unit 41 . Based on the currents measured by the current sensors 24a and 24b, the current detection unit 41 determines whether or not the current values flowing through the voltage lines L1 and L2 on the load side, that is, the current values passing through the circuit breaker 2 exceed a predetermined threshold value. To detect. When the current detection unit 41 detects that the current value passing through the circuit breaker 2 exceeds a predetermined threshold value, the current detection unit 41 outputs a current detection signal (an example of a first detection signal) indicating that the current value exceeds the predetermined threshold value. Output. The current detection unit 41 is configured to continuously output a current detection signal for a preset predetermined time (for example, 1 second).

The handle position detector 42 is connected to the handle holder 31 . The handle position detector 42 detects the mechanical position of the handle holder 31 (upper or lower). The handle position detection unit 42 recognizes the position of the handle 23 of the circuit breaker 2 based on the detected position of the handle holding unit 31, and detects whether the handle 23 is in the open state or the closed state. When the handle position detector 42 detects that the handle 23 is open, it outputs a handle open/close signal (an example of a second detection signal) indicating that the handle 23 is open. A steering wheel opening/closing signal output from the steering wheel position detection unit 42 is input to the determination unit 44 .

The voltage detector 43 is connected to load-side contacts (for example, load-side contacts 122a, 122b, and 122c) on the load side of the circuit breaker 2 . In the illustrated example, the voltage detector 43 is connected to a load-side terminal 22a conducting to the load-side contact 122a and a load-side terminal 22c conducting to the load-side contact 122c. The voltage detection unit 43 detects the presence or absence of voltage on the secondary side of the circuit breaker 2, that is, the presence or absence of voltage on the load side contacts 122a and 122c. The voltage detection unit 43 detects that there is no voltage on the secondary side of the circuit breaker 2, that is, that the load-side contacts 122a and 122c are not conducting to the power-side contacts 121a and 121c on the power supply side. In this case, a voltage undetected signal (an example of a third detection signal) indicating that no voltage is detected on the secondary side of the circuit breaker 2 is output. A voltage undetected signal output from the voltage detection unit 43 is input to the determination unit 44 .

When the circuit breaker 2 is in a tripped state, the determination unit 44 determines whether or not the cause of the tripped state is an overcurrent. For example, the determination unit 44 detects a current detection signal from the current detection unit 41 indicating that the value of the current flowing through the voltage lines L1 and L2 on the load side, that is, the value of the current flowing through the circuit breaker 2 exceeds a predetermined threshold value, and the handle Based on the handle open/close signal of the handle position detector 42 indicating that the circuit breaker 23 is in the open state, it is determined whether or not the circuit breaker 2 is tripped due to overcurrent.

Further, the determination unit 44 may determine whether or not the cause of the trip state of the circuit breaker 2 is overcurrent based on the current detection signal and the voltage non-detection signal. Further, the determination unit 44 may determine whether or not the overcurrent caused the circuit breaker 2 to be tripped based on the current detection signal, the steering wheel open/close signal, and the voltage non-detection signal. .

The handle control section 32 has a handle position detection section 42 and a drive section 51 that drives the handle holding section 31 . The handle control section 32 controls the drive section 51 to drive the handle holding section 31 . The handle control section 32 controls the drive section 51 based on the determination result of the determination device 4 . For example, when the handle control unit 32 determines that the circuit breaker 2 has been turned off due to temporary overcurrent such as noise, the handle control unit 32 closes the open handle 23 by moving the handle holding unit 31 from the lower side to the upper side. state to reclose the circuit breaker 2.

The display unit 33 is composed of, for example, an LED (light emitting diode) numeric display. The display unit 33 is connected to the determination unit 44, and based on the display instruction signal from the determination unit 44, the operation state (normal operation state, trip state, etc.) of the circuit breaker 1 with automatic re-closing function display the number of times

The notification unit 34 is connected to the determination unit 44, and based on the notification instruction signal from the determination unit 44, for example, indicates that the circuit breaker 1 with an automatic re-closing function is in a trip state caused by overcurrent. Notify with an audible alarm. Note that the notification unit 34 may be provided as an external alarm buzzer instead of being part of the configuration of the automatic re-insertion device 3 .

The storage unit 35 is communicably connected to the determination unit 44 . The storage unit 35 stores a predetermined threshold value of the current flowing through the circuit breaker 2, a specific predetermined time of the current detection signal output from the current detection unit 41, and the like. The storage unit 35 also stores a plurality of programs that cooperate with the current detection unit 41, the steering wheel position detection unit 42, the voltage detection unit 43, and the determination unit 44 to cause the determination device 4 to execute specific processing. there is

The power supply unit 36 receives power from the power supply side of the circuit breaker 2 and supplies a predetermined voltage to each unit of the automatic reconnection device 3 .

Next, the operation of the circuit breaker 1 with an automatic re-closing function will be described with reference to specific determination examples of the determination device 4. FIG.
FIG. 3 is a flow chart for determining whether or not the circuit breaker 2 is tripped due to overcurrent.
FIG. 6 is a time chart showing a first determination example when the value of the current flowing through the circuit breaker 2 exceeds a predetermined threshold. (a) of FIG. 6 is a diagram showing changes in the value of the current flowing through the circuit breaker 2, (b) is a diagram showing the current detection signal output from the current detection section 41, and (c) is FIG. 4 is a diagram showing a steering wheel open/close signal output from a steering wheel position detection unit 42, FIG. 4D is a diagram showing a voltage undetected signal output from a voltage detection unit 43, and FIG. FIG. 10 is a diagram showing an abnormal trip determination signal to be output;

As shown in FIG. 3, the current detector 41 acquires current values flowing through the voltage lines L1 and L2 (step S10).
Subsequently, the current detector 41 detects whether or not the value of current flowing through the circuit breaker 2 exceeds a predetermined threshold (step S11).

In step S11, if it is detected that the current flowing through the circuit breaker 2 does not exceed the predetermined threshold value (NO in step S11), the current detection unit 41 returns to step S10 and repeats each process.
In (a) of FIG. 6, it is detected that the current value i1 before time t1 does not exceed the predetermined threshold value.

Further, when it is detected in step S11 that the current value i1 flowing through the circuit breaker 2 exceeds the predetermined threshold value (YES in step S11), the current detection unit 41 detects the , a current detection signal indicating that the current value exceeds a predetermined threshold value is continuously output to the determination unit 44 for a preset predetermined time (for example, 1 second) (step S12).

Subsequently, the determination unit 44 acquires the steering wheel opening/closing signal output from the steering wheel position detection unit 42 (step S13).

As described above, the handle open/close signal is a signal indicating whether the handle 23 of the circuit breaker 2 is open or closed. The handle position detector 42 detects the mechanical position of the handle holder 31 when outputting the handle open signal in the handle open/close signal. The handle holding portion 31 is set to hold the handle 23 and changes its position as the handle 23 is opened and closed. Therefore, the output timing of the handle open signal output from the handle position detector 42 is such that the circuit breaker 2 trips and the current value i1 of the circuit breaker 2 becomes zero, as shown in FIG. 6(c). The timing of time t3 is later than the timing of time t2.

Based on the current detection signal from the current detection unit 41 and the handle opening/closing signal from the handle position detection unit 42, the determination unit 44 determines whether or not the cause of the trip of the circuit breaker 2 is overcurrent. (Step S14). If the current detection signal from the current detection unit 41 is an ON output and the steering wheel opening/closing signal from the steering wheel position detection unit 42 is a steering wheel open signal, the determination unit 44 determines the cause of the trip of the circuit breaker 2. It is judged to be caused by overcurrent.

When it is determined in step S14 that the cause of the trip of the circuit breaker 2 is not due to overcurrent (NO in step S14), the determination section 44 returns to step S13 and repeats each process.
In FIG. 6, for example, in the period from time t1 to time t2 when the current value i1 of the circuit breaker 2 exceeds a predetermined threshold value, the current detection signal is an ON output, but the steering wheel open/close signal is a steering wheel closed signal. Therefore, it is determined as NO in step S14 of FIG. 3, and the process returns to step S13.

On the other hand, in step S14, when it is determined that the cause of the trip of the circuit breaker 2 is due to overcurrent, that is, it is determined that the current detection signal is an ON output and the steering wheel open/close signal is a steering wheel open signal. If so (YES in step S14), the determination unit 44 determines that the circuit breaker 2 is in an abnormal trip state, and stops the reclosing function of the circuit breaker 2 (step S15).
In FIG. 6, for example, at the timing of time t3 when the steering wheel position detection unit 42 outputs the steering wheel open signal, it is determined that the current detection signal is ON output and the steering wheel open/close signal is the steering wheel open signal. be. Therefore, as shown in (e), at time t4, the determination unit 44 outputs a determination signal indicating that the circuit breaker 2 is in an abnormal trip state.

If it is determined in step S14 that the cause of the trip of the circuit breaker 2 is not due to overcurrent for a predetermined time (NO in step S14), the process returns to step S10 and each process is repeated.

Next, the flowchart shown in FIG. 3 will be described with reference to a second determination example when the value of the current flowing through the circuit breaker 2 exceeds a predetermined threshold.
FIG. 7 is a time chart for explaining the second determination example. Note that (a) to (e) of FIG. 7 show the same signals as (a) to (e) of FIG.

As described above, in step S11, when it is detected that the current value flowing through the circuit breaker 2 exceeds the predetermined threshold value (YES in step S11), the current detection unit 41 detects that the current value exceeds the predetermined threshold value. A current detection signal indicating that the current has been detected is continuously output to the determination unit 44 for a preset predetermined time (step S12).
As shown in (a) and (b) of FIG. 7, at time t5 when the current value i2 exceeds the predetermined threshold, the current detection signal is continuously output from the current detection unit 41 for a predetermined time.

Subsequently, the determination unit 44 acquires the steering wheel opening/closing signal output from the steering wheel position detection unit 42 (step S13).
The steering wheel opening/closing signal is a signal that changes according to the opening/closing state of the steering wheel 23. In the second determination example shown in FIG. , the handle remains signaled as closed.

Therefore, in step S14, the current detection signal is an ON output, but the steering wheel opening/closing signal is a steering wheel closing signal, so the determination unit 44 continues to determine NO.
Therefore, as shown in (e) of FIG. 7, the trip determination signal remains a determination signal that is not an abnormal trip. An example of such a current value i2 is an instantaneous current such as a noise current.

In this way, when the current detection signal is continuously output for a predetermined period of time based on an instantaneous overcurrent such as noise current, the steering wheel opening signal is not output, so that it is not judged to be an abnormal trip. .

Next, the flowchart shown in FIG. 3 will be described with reference to a judgment example when the current value flowing through the circuit breaker 2 does not exceed the predetermined threshold value.
FIG. 8 is a time chart showing a determination example when the value of the current flowing through the circuit breaker 2 does not exceed the predetermined threshold. Note that (a) to (e) of FIG. 8 show the same signals as (a) to (e) of FIG.

As shown in (a) of FIG. 8, even if the current value i3 flowing through the circuit breaker 2 does not exceed the predetermined threshold value, an unknown trip may occur at time t6, for example.

In this case, since the state of the handle 23 of the circuit breaker 2 changes from the closed state to the open state due to the trip of the circuit breaker 2, the current value i3 becomes zero at time t6, as shown in FIG. After a little delay, a steering wheel open signal is output at time t7.

As described above, in step S11, when it is detected that the current flowing through the circuit breaker 2 does not exceed the predetermined threshold value (NO in step S11), the current detection unit 41 returns to step S10 and performs each process. repeat. Therefore, the process does not proceed to step S12.

Since the current value i3 does not exceed the predetermined threshold value, the current detection signal indicating that the predetermined threshold value has been exceeded remains off as shown in FIG. 8(b).

In this way, when an unknown trip occurs when the predetermined threshold is not exceeded, the current detection signal is not turned on. Therefore, no determination signal indicating an abnormal trip is output. Therefore, the determination unit 44 causes the drive unit 51 to drive the handle holding unit 31 via the handle control unit 32 to reclose the circuit breaker 2 . As a result, current begins to flow through the circuit breaker 2 at time t8, as shown in FIG. 8(a). Further, as shown in FIG. 8(c), at time t9, the steering wheel position detector 42 outputs a steering wheel closed signal.

(Modification 1)
Next, a case will be described in which the determination device 4 determines whether or not the cause of the trip state of the circuit breaker 2 is overcurrent based on the current detection signal and the voltage non-detection signal.
FIG. 4 is a flow chart for judging whether or not the circuit breaker 2 has been tripped due to overcurrent based on the current detection signal and the voltage non-detection signal.
First, the flowchart shown in FIG. 4 will be described with reference to FIG. 6, which is a first judgment example when the value of the current flowing through the circuit breaker 2 exceeds a predetermined threshold.

The processing contents of steps S20 to S22 in FIG. 4 are the same as the processing contents of steps S10 to S12 in FIG.

Following step S22, the determination unit 44 acquires a detection signal output from the voltage detection unit 43, that is, a detection signal indicating whether voltage is being output to the secondary side of the circuit breaker 2 (step S23). .
As shown in (d) of FIG. 6, the voltage non-detection signal indicating that no voltage is detected on the secondary side of the circuit breaker 2 causes the circuit breaker 2 to trip and the current value i1 of the circuit breaker 2 to be zero. is output at time t10 so as to synchronize with the timing of time t2.

Based on the current detection signal from the current detection unit 41 and the detection signal (voltage undetected signal) from the voltage detection unit 43, the determination unit 44 determines whether the cause of the trip of the circuit breaker 2 is overcurrent. It is determined whether or not (step S24). When the current detection signal from the current detection unit 41 is output as ON and the voltage non-detection signal is output from the voltage detection unit 43, the determination unit 44 determines that the cause of the trip of the circuit breaker 2 is overcurrent. Determined to be due to

When it is determined in step S24 that the cause of the trip of the circuit breaker 2 is not due to overcurrent (NO in step S24), the determination section 44 returns to step S23 and repeats each process.
In FIG. 6, for example, the current detection signal is ON during a period from time t1 when the current value i1 of the circuit breaker 2 exceeds a predetermined threshold to time t2 when the circuit breaker 2 trips and the current value i1 becomes zero. but the voltage undetected signal is not output. Therefore, the determination in step S14 of FIG. 4 is NO, and the process returns to step S23.

On the other hand, in step S24, when it is determined that the cause of the trip of the circuit breaker 2 is due to overcurrent, that is, the current detection signal is ON output, and the voltage non-detection signal from the voltage detection unit 43 is output. When it is determined that the circuit breaker 2 is in an abnormal trip state (YES in step S24), the determination unit 44 determines that the circuit breaker 2 is in an abnormal trip state, and stops the reclosing function of the circuit breaker 2 (step S25).
In FIG. 6, for example, at the timing of time t10 when the voltage non-detection signal is output from the voltage detection unit 43, the current detection signal is ON and the voltage non-detection signal is output from the voltage detection unit 43. is determined to be Therefore, as shown in (e), at time t11, the determination unit 44 outputs a determination signal indicating that the circuit breaker 2 is in an abnormal trip state.

In step S24, when the predetermined time during which the current detection signal is ON has elapsed, it is determined that the cause of the trip of the circuit breaker 2 is not due to overcurrent (NO in step S24). Returning to step S20, each process is repeated.

(Modification 2)
FIG. 5 shows that the determination device 4 detects the current detection signal output from the current detection unit 41, the steering wheel opening/closing signal output from the steering wheel position detection unit 42, and the voltage non-detection signal output from the voltage detection unit 43. Based on this, it is a flowchart for determining whether or not the cause of the trip state of the circuit breaker 2 is overcurrent.

In step S35, the determination unit 44 determines that, for example, the current detection signal from the current detection unit 41 is an ON output, the steering wheel open/close signal from the steering wheel position detection unit 42 is a steering wheel open signal, and the voltage detection unit 43 is output, it is determined that the cause of the trip of the circuit breaker 2 is overcurrent.
The processing contents of each step in FIG. 5 are the same as the processing contents of the flowcharts shown in FIGS.

(Effect)
By the way, in the conventional device, as shown in FIG. 9, the current value i4 flowing through the circuit breaker 2 exceeds a predetermined threshold value at time t14, for example, and continues for a predetermined time. It becomes zero at t15. When the current value i4 flowing through the circuit breaker 2 exceeds the predetermined threshold value at time t14, the current detection unit 41 outputs a current detection signal indicating that the predetermined threshold value has been exceeded, as shown in FIG. 9(b). When the circuit breaker 2 trips and the current value i4 becomes zero and falls below a predetermined threshold value, the current detection signal is turned off at time t15.

Further, when the circuit breaker 2 trips, the handle 23 of the circuit breaker 2 changes from the closed state to the open state. Since the mechanical position of the handle holding portion 31 is detected, the detection timing is delayed. Therefore, as shown in FIG. 9C, the rise timing t16 of the steering wheel opening/closing signal output from the steering wheel position detector 42 is delayed from the time t15 at which the current value i4 becomes zero. Since the steering wheel opening/closing signal is output with a delay after the current detection signal is turned off, the judging section 44 outputs from the steering wheel position detecting section 42 the occurrence of an abnormal trip caused by overcurrent. In some cases, it was not possible to make an accurate determination using the steering wheel open/close signal.

Further, the contact in the circuit breaker 2 becomes non-conducting due to the trip of the circuit breaker 2, and the voltage on the secondary side becomes zero. When the voltage on the secondary side of the circuit breaker 2 becomes zero, the voltage detector 43 outputs a voltage non-detection signal indicating that there is no voltage on the secondary side of the circuit breaker 2, as shown in FIG. 9(d). However, due to a timing error, the output timing of the voltage non-detection signal may occur after the current detection signal is turned off. Therefore, when the output timing of the voltage non-detection signal is after the current detection signal is turned off, the occurrence of an abnormal trip caused by overcurrent is detected using the voltage non-detection signal output from the voltage detection unit 43. In some cases, it was not possible to make an accurate determination.

As described above, in the conventional device, even if the circuit breaker is tripped due to overcurrent, at the timing when the handle of the circuit breaker is lowered or at the timing when the voltage non-detection signal is output from the voltage detection unit 43, In some cases, when the value of the current flowing through the circuit breaker has already reached below the predetermined threshold value, it may not be possible to determine that the cause of the trip state is the overcurrent.

On the other hand, according to the configuration of the determination device 4 of the present embodiment, the current detection unit 41 detects the current value indicating that the current value exceeds the predetermined threshold value for a predetermined time after the current value exceeds the predetermined threshold value. configured to hold the signal. Therefore, even if the current value flowing through the circuit breaker 2 has already reached below the predetermined threshold at the timing when the handle 23 is lowered, the handle open signal is detected while the current detection signal is held for the predetermined time. If so, based on the current detection signal and the handle opening/closing signal, it can be determined that the cause of the breaker 2 being tripped is overcurrent. Thus, according to the configuration of the determination device 4, it is possible to improve the determination accuracy for determining whether or not the cause of the circuit breaker 2 being in the trip state is overcurrent.

In addition, based on the current detection signal and the voltage non-detection signal indicating that the voltage on the secondary side of the circuit breaker 2 is not detected, the determination device 4 determines that the cause of the trip state of the circuit breaker 2 is excessive. You may determine whether it is a current. According to this configuration, even if the current value flowing through the circuit breaker 2 has already reached below the predetermined threshold at the timing when the handle 23 is lowered, the circuit breaker When the voltage non-detection signal indicating that the voltage on the secondary side of the circuit breaker 2 is not detected is detected, based on the current detection signal and the voltage non-detection signal, the cause of the circuit breaker 2 reaching the trip state is excessive. It can be determined to be current.
In addition, since the voltage detection unit 43 has higher responsiveness than, for example, the steering wheel position detection unit 42, the determination time of the determination unit 44 can be shortened.

Further, according to the determination device 4, the voltage detection section 43 is connected to the voltage contact on the secondary side of the circuit breaker 2, so that the responsiveness of the voltage detection section 43 can be further improved. It should be noted that the voltage detection unit 43 may be configured to be connected to a portion that is electrically connected to the contact, instead of being directly connected to the contact of the voltage on the secondary side of the circuit breaker 2 .

Further, the determination unit 44 detects the current detection signal, the handle opening/closing signal indicating that the handle 23 of the circuit breaker 2 is in the open state, and the voltage on the secondary side of the circuit breaker 2. Based on at least one of the voltage non-detection signals indicating that the circuit breaker 2 has not been detected, it may be determined whether or not the cause of the breaker 2 reaching the trip state is overcurrent. According to this configuration, it is possible to further improve the determination accuracy of determining whether or not the cause of the circuit breaker 2 being in the trip state is overcurrent.

Further, the automatic re-closing device 3 includes a determination device 4, a handle holding portion 31 attached to the handle 23 of the circuit breaker 2, and a handle control portion for controlling the operation of the handle holding portion 31 based on the determination result of the determination device 4. 32 and. According to this configuration, by attaching the handle holding portion 31 matching the shape of the handle 23 to the handle 23, the handle control portion 32 can quickly operate the circuit breaker 2 via the handle holding portion 31 and its drive mechanism. The handle 23 can be changed from the open state to the closed state.

Moreover, when the current detection signal and the voltage non-detection signal are used for determination, the handle holding portion 31 matching the shape of the handle 23 of each circuit breaker 2 is not required, and the parts cost can be suppressed.

Further, the automatic re-closing device 3 combines the detection signals of both the handle position detection section 42 and the voltage detection section 43 to determine whether the handle holding section 31 has been moved to the avoidance position for maintenance. , the circuit breaker 2 is tripped due to overcurrent, and the position of the handle holder 31 is moved.

It should be noted that the present invention is not limited to the above-described embodiments, and can be modified, improved, etc. as appropriate. In addition, the material, shape, size, numerical value, form, number, location, etc. of each component in the above-described embodiment are arbitrary and not limited as long as the present invention can be achieved.

For example, in the above embodiment, the case where the power distribution system is the single-phase three-wire system has been described, but the system is not limited to this system. For example, it may be a single-phase two-wire system or a three-phase three-wire system.

Further, in the above embodiment, the current sensors 24a and 24b are connected to the voltage lines L1 and L2 connected to the load terminals 22a and 22c, but the present invention is not limited to this. The current sensor may be connected to, for example, the voltage line L1 and the neutral line N, or the voltage line L2 and the neutral line N, or may be connected to either the voltage lines L1, L2 or the neutral line N. Alternatively, they may be connected to all of the voltage lines L1, L2 and the neutral line N.

1: Circuit breaker with automatic re-closing function, 2: Circuit breaker, 3: Automatic re-closing device, 4: Judgment device, 21: Power supply side (primary side) terminal block, 21a to 21c: Power supply side terminals, 22: Load side (Secondary side) terminal block, 22a to 22c: load side terminal, 23: handle, 24a, 24b: current sensor, 31: handle holding portion, 32: handle control portion, 33: display portion, 34: notification portion, 35 : storage unit, 36: power supply unit, 41: current detection unit, 42: handle position detection unit (an example of handle detection unit), 43: voltage detection unit, 44: determination unit, 51: drive unit, 121a to 121c: power supply side contacts, 122a to 122c: load side contacts, L1, L2: voltage lines, N: neutral line

Claims (9)

a current detection unit that detects whether or not the value of current flowing through the circuit breaker exceeds a predetermined threshold;
a handle detection unit that detects whether the handle of the circuit breaker is in an open state;
a determination unit that determines whether or not the circuit breaker is in a trip state due to overcurrent;
with
The current detection unit is configured to hold a first detection signal indicating that the current value exceeds the predetermined threshold for a predetermined time after the current value exceeds the predetermined threshold,
Based on the first detection signal and a second detection signal indicating that the handle of the circuit breaker is in an open state, the determination unit determines that the cause of the trip state of the circuit breaker is overcurrent. determining whether or not
judgment device. a current detection unit that detects whether or not the value of current flowing through the circuit breaker exceeds a predetermined threshold;
a voltage detection unit that detects the presence or absence of voltage on the secondary side of the circuit breaker;
a determination unit that determines whether or not the circuit breaker is in a trip state due to overcurrent;
with
The current detection unit is configured to hold a first detection signal indicating that the current value exceeds the predetermined threshold for a predetermined time after the current value exceeds the predetermined threshold,
Based on the first detection signal and a third detection signal indicating that the voltage on the secondary side of the circuit breaker is not detected, the determination unit determines that the cause of the trip state of the circuit breaker is excessive. determining whether it is current,
judgment device. a current detection unit that detects whether or not the value of current flowing through the circuit breaker exceeds a predetermined threshold;
a handle detection unit that detects whether the handle of the circuit breaker is in an open state;
a voltage detection unit that detects the presence or absence of voltage on the secondary side of the circuit breaker;
a determination unit that determines whether or not the circuit breaker is in a trip state due to overcurrent;
with
The current detection unit is configured to hold a first detection signal indicating that the current value exceeds the predetermined threshold for a predetermined time after the current value exceeds the predetermined threshold,
The determination unit provides the first detection signal, the second detection signal indicating that the handle of the circuit breaker is in an open state, and the voltage on the secondary side of the circuit breaker not being detected. Determining whether or not overcurrent is the cause of the circuit breaker tripping, based on at least one of the third detection signals;
judgment device. The voltage detection unit is connected to a voltage contact on the secondary side of the circuit breaker or a portion electrically connected to the contact,
The determination device according to claim 2 or 3. A determination device according to any one of claims 1 to 4;
a handle holder attached to the handle of the circuit breaker;
a control unit that controls the operation of the handle holder based on the determination result of the determination device;
automatic reloading device. A circuit breaker with an automatic re-closing function, comprising the automatic re-closing device according to claim 5 and the circuit breaker. A program for causing a determination device comprising a current detection unit, a steering wheel detection unit, and a determination unit to execute the following processing,
causing the current detection unit to detect whether or not the current value passing through the circuit breaker exceeds a predetermined threshold value, and for a predetermined time after the current value exceeds the predetermined threshold value, the current value exceeds the predetermined threshold value; holding a first detection signal indicating that the
causing the handle detection unit to detect whether or not the handle of the circuit breaker is in an open state;
Based on the first detection signal and a second detection signal indicating that the handle of the circuit breaker has been detected to be in the open state, the judging unit determines that the cause of the trip state of the circuit breaker is overcurrent. a step of determining whether or not
A program that executes a process including A program for causing a determination device including a current detection unit, a voltage detection unit, and a determination unit to execute the following processing,
causing the current detection unit to detect whether or not the current value passing through the circuit breaker exceeds a predetermined threshold value, and for a predetermined time after the current value exceeds the predetermined threshold value, the current value exceeds the predetermined threshold value; holding a first detection signal indicating that the
causing the voltage detection unit to detect the presence or absence of voltage on the secondary side of the circuit breaker;
Based on the first detection signal and a third detection signal indicating that the voltage on the secondary side of the circuit breaker is not detected, the determination unit determines that the cause of the trip state of the circuit breaker is excessive. a step of determining whether it is current;
A program that executes a process including A program for causing a determination device including a current detection unit, a steering wheel detection unit, a voltage detection unit, and a determination unit to execute the following processing,
causing the current detection unit to detect whether or not the current value passing through the circuit breaker exceeds a predetermined threshold value, and for a predetermined time after the current value exceeds the predetermined threshold value, the current value exceeds the predetermined threshold value; holding a first detection signal indicating that the
causing the handle detection unit to detect whether or not the handle of the circuit breaker is in an open state;
causing the voltage detection unit to detect the presence or absence of voltage on the secondary side of the circuit breaker;
The first detection signal, the second detection signal indicating that the handle of the circuit breaker is in the open state, and the voltage on the secondary side of the circuit breaker being not detected in the determination unit. determining whether or not the circuit breaker is tripped due to overcurrent based on at least one of the third detection signals;
A program that executes a process including

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