JP2022098567A - Electric discharge detection system - Google Patents

Abstract

To enable noise detection without increasing the size of a distribution board.SOLUTION: An electric discharge detection system is provided which detects noise superimposed on voltage or current of a cable run to which a load is connected and determines an electric discharge event, the electric discharge detection system comprises: an electric discharge detection device 60 that detects noise superimposed on voltage or current of the cable run to which the load is connected and determines the electric discharge event; and a monitoring device 40 comprising a communication unit that performs communication with the electric discharge detection device on an electric discharge event detection signal, and notification means that notifies the outside that the electric discharge event has occurred, wherein the electric discharge detection device is connected to an outlet 91 provided on the secondary side of a branch circuit of a distribution board, and when the notification means receives the electric discharge event detection signal sent from the electric discharge detection device, the notification means notifies the outside of the determination result for the electric discharge event.SELECTED DRAWING: Figure 1

Description

The present invention relates to a discharge detection system.

As described in Patent Document 1, there is known a method of detecting in which branch circuit of a distribution board a discharge occurs. In the technique disclosed in Patent Document 1, it is considered to detect using a noise detection unit provided so as to be one-to-one with respect to the branch circuit.

Japanese Unexamined Patent Publication No. 2020-12626

By the way, in order to attach the noise detection unit, it is necessary to form the noise detection unit after removing the wiring on the secondary side of the branch circuit once, and there are problems in workability and installation. Further, there is a problem that a gutter space for placing a noise detection unit on the distribution board is required and the housing size becomes large.

The inventor of this case tried to solve this problem by diligently examining this point. An object to be solved by the present invention is to enable noise detection without increasing the size of the distribution board.

In order to solve the above problems, it is a discharge detection system that detects the noise superimposed on the voltage or current of the electric circuit to which the load is connected and determines the discharge event, and it is the voltage or current of the electric circuit to which the load is connected. A discharge detection device that detects superimposed noise and determines a discharge event, a communication unit that communicates between the discharge detection device and a discharge event detection signal, and a notification means that notifies the outside that a discharge event has occurred. The discharge detection device is connected to an outlet provided on the secondary side of the branch circuit of the distribution board, and the notification means detects the discharge event sent from the discharge detection device. A discharge detection system that notifies the outside of the judgment result of a discharge event when a signal is received.

When detection signals are transmitted from a plurality of discharge detection devices, the monitoring device compares at least one of the noise output value, noise duration, and noise detection time of each received detection signal, and discharges. It is preferable to have a configuration including a comparison unit that identifies the circuit in which the event occurred.

Further, in at least some of the discharge detection devices, the communication units of the discharge detection devices can communicate with each other, and the detection signal of the first discharge detection device is transmitted to the monitoring device by relaying the second discharge detection device. It is preferable to have a configuration that can be used.

Further, the monitoring device includes a cutoff signal output unit that transmits a cutoff signal, and when the monitoring device receives the detection signal transmitted by the discharge detection device, the monitoring device sends the cutoff signal to the main circuit or the branch circuit of the distribution board. It is preferable to have a configuration for transmission.

Further, it is preferable that the notification means provided in the monitoring device includes a display unit for displaying the individual identification number on the surface of the monitoring device.

In the present invention, it is possible to detect noise without increasing the size of the distribution board.

It is a figure which shows the example which made it possible to monitor a discharge using a discharge detection system. However, the monitoring device is built in a housing provided outside the distribution board. It is a figure which shows the example of a building which made it possible to monitor a discharge using a discharge detection system. It is a figure which shows that when the discharge is detected by one of the discharge detection devices, the alarm is issued by both the discharge detection device and the monitoring device. It is a figure which shows the example of the appearance of a master unit. It is a figure which shows a part example of the circuit of a master unit. It is a figure which shows the example which compared the noise detected by a plurality of discharge detection devices. However, this is an example in which the monitoring device is installed in the distribution board. It is a figure which shows the example of the appearance of a slave unit. It is a figure which shows a part example of the circuit of a slave unit. It is a figure which shows the example which connected the discharge detection device to each other by a communication line. It is a figure which shows that the information about whether or not the discharge was detected is sent from the discharge detection device to another discharge detection device in order by the relay method. It is a figure which shows that the information is directly transmitted from the discharge detection device which detected the discharge to other plurality of discharge detection devices.

The embodiment for carrying out the invention is shown below. As can be seen from FIGS. 1 and 3, the discharge detection system of the present embodiment detects the noise superimposed on the voltage or current of the electric circuit to which the load is connected to determine the discharge event. I do. This discharge detection system includes "a discharge detection device 60 that detects noise superimposed on the voltage or current of the electric circuit to which the load is connected and determines a discharge event" and "a discharge detection device 60 and a discharge event detection signal". A monitoring device 40 "equipped with a communication unit 48 for communicating with the user, a notification means 49 for notifying the outside that a discharge event has occurred, and a monitoring device 40". Further, the discharge detection device 60 is connected to an outlet 91 provided on the secondary side of the branch circuit 82 of the distribution board 8 provided with the main circuit 81 and the branch circuit 82, and the notification means 49 is connected to the discharge detection device 60. When the transmitted discharge event detection signal is received, the determination result of the discharge event is notified to the outside. Therefore, it is not necessary to incorporate the discharge detection device 60 inside the distribution board 8. Therefore, it is possible to detect noise without increasing the size of the distribution board 8.

Next, the details of the discharge detection system of the embodiment will be described. As can be understood from FIG. 1, the distribution board 8 to which the discharge detection system is applied includes a main circuit breaker which is a main circuit 81 and a branch breaker which is a branch circuit 82. The monitoring device 40 is connected to the bus bar connecting the main circuit 81 and the branch circuit 82. That is, the monitoring device 40 is connected to the primary side of the branch circuit 82.

The branch circuit 82 is electrically connected to an outlet 91 formed in the building, and the discharge detection device 60 is connected to the outlet 91. Based on the result detected by the discharge detection device 60, the monitoring device 40 can make various determinations. Since the monitoring device 40 of the embodiment does not perform discharge detection, the monitoring device 40 performs various operations and determinations based on the information sent from the discharge detecting device 60.

In the embodiment shown in FIG. 1, the monitoring device 40 is located outside the distribution board 8 and is housed in a housing 59 separate from the distribution board 8. Therefore, the discharge can be detected without increasing the size of the distribution board 8. By doing so, it is possible to avoid complicated wiring work performed inside the distribution board 8.

The monitoring device 40 may be housed in the distribution board 8. In this case, a space for inserting the monitoring device 40 or the like is required for the distribution board 8, but the size of the distribution board 8 is suppressed because it is not necessary to store a plurality of discharge detection devices 60 in the distribution board 8. can do.

In the monitoring device 40 of the embodiment, a signal line 85 for transmitting a cutoff signal is attached to the main circuit 81 and the branch circuit 82. Further, the monitoring device 40 of the embodiment is supplied with power from the bus bar of the distribution board 8. In the embodiment, power is supplied from the bus bar to the power supply unit 41, and the power is sent from there to various parts of the monitoring device 40. However, the supply of power to the monitoring device 40 does not have to be in such a form.

The monitoring device 40 of the embodiment has a calculation unit 45 built therein, and can send instructions to various devices provided in the monitoring device 40. Further, the monitoring device 40 includes a communication unit 48 that communicates with the discharge detection device 60, and receives a detection signal transmitted from the discharge detection device 60. Further, a cutoff signal output unit 47 for transmitting a cutoff signal is provided. Therefore, the monitoring device 40 receives the noise detection detection signal sent from the discharge detection device 60 or the detection signal of the discharge event, and receives the "main circuit 81" of the distribution board 8 and the "discharge receiving the detection signal". A cutoff signal can be output to the branch circuit 82 connected to the detection device 60.

The monitoring device 40 is provided with a blocking signal output unit 47 for transmitting a blocking signal, and when the monitoring device 40 receives the detection signal transmitted by the discharge detection device 60, the monitoring device 40 is the main circuit 81 or the branch circuit 82 of the distribution board 8. It is preferable that the cutoff signal is transmitted to the main circuit 81, but the cutoff signal may be one that transmits a signal instructing the cutoff to the leakage cutoff device of the main circuit 81 and the branch circuit 82. Pseudo-leakage may be passed through the ground terminal formed on the secondary side of each circuit.

The monitoring device 40 of the embodiment is provided with a notification means 49 for notifying the information to the outside. The notification means 49 of the embodiment is designed to notify the information to the outside based on the content output by the output unit provided in the monitoring device 40. The notification means 49 may be a power display unit 49a for displaying that the monitoring device 40 is energized, a speaker 49b capable of outputting voice, or any other device. In the example shown in FIG. 1, information can be sent to the alarm device 93 provided separately from the monitoring device 40 and the discharge detection device 60. By doing so, it becomes easy to widely inform the result of the discharge detection.

In the examples shown in FIGS. 4 and 5, in addition to the power display unit 49a and the speaker 49b, when a detection signal from the discharge detection device 60 is received, the operator is made to know which discharge detection device 60 received the signal. It is provided with a display unit 49c capable of enabling it. The display unit 49c of the embodiment is provided on the surface of the monitoring device 40, and the content can be displayed by the LED. A reset button 52 capable of resetting the display of the display unit 49c and the like is also provided on the surface of the monitoring device 40.

In the embodiment, when a discharge is detected, the discharge detection device 60 transmits an individual identification number together with the detection signal. Therefore, the monitoring device 40 displays a number on the display unit 49c based on the received individual identification number. Display for identification. As described above, the notification means 49 provided in the monitoring device 40 preferably includes a display unit 49c for displaying the individual identification number on the surface of the monitoring device 49. The communication between the monitoring device 40 and the discharge detection device 60 may be performed wirelessly or by PLC.

By the way, there may be a problem caused by noise wrapping around from another circuit. Therefore, as shown in FIG. 6, when a plurality of discharge detection devices 60 are installed, noise may be detected by the discharge detection device 60, which has little relation to the location that causes noise. Even in such a state, in order to make a more accurate determination, it is preferable to compare the noise detection results with each other so that the problematic part can be identified. In the embodiment, when a detection signal is transmitted from a plurality of discharge detection devices 60 to the monitoring device 40, the comparison unit 54 provided in the monitoring device 40 is within the range controlled by which discharge detection device 60. Judgment is made by comparing whether a discharge event has occurred.

The comparison unit 54 provided in the monitoring device 40 is a noise output value and noise indicating how much noise of each received detection signal is output when detection signals are transmitted from a plurality of discharge detection devices 60. It is possible to identify the circuit where the discharge event occurred by comparing at least one of the noise duration, which indicates how long the output of the noise has continued, and the noise detection time, which indicates when the noise originated. It is preferable that it is a thing.

For example, in the example shown in FIG. 6, a discharge event occurs within the control range of the discharge detection device 60 recognized as the third device, but noise is detected by the second and third discharge detection devices 60. There is. Comparing each noise, it can be seen that the noise detected by the third discharge detection device 60 has a larger noise output value. Further, it can be seen that the noise detected by the No. 3 discharge detection device 60 has a longer duration of noise and the timing at which the noise starts to appear is earlier. Since such an item serves as a reference for determining the discharge detection device 60 that should be shut off, the discharge detection device 60 that should be shut off should be determined when one or more of them are grasped. Just do it. In the example shown in FIG. 6, the discharge detection device 60 is formed so as to issue a report at the same time when it is detected, and only the discharge detection device 60 specified after the comparison of the monitoring devices 40 is notified. However, the discharge detection device 60 does not issue a warning when it is detected, sends a detection signal to the monitoring device 40, the monitoring device 40 compares the sent values, and the discharge detection device 60, which is the maximum output. It may be the one that sends a signal so that only the alarm is issued.

In this way, with respect to the information transmitted from the plurality of discharge detection devices 60 to the comparison unit 54 of the monitoring device 40, the monitoring device 40 sets items such as the magnitude of the noise output value, the noise detection start time, and the noise duration. It is preferable to determine the location where the discharge event has occurred by performing the comparison determination, and send the cutoff signal to the branch circuit 82 and the main circuit 81.

At this time, it is preferable to send a cutoff signal from the monitoring device 40 to the corresponding branch circuit 82 and the main circuit 81, but this is applicable from the discharge detection device 60 that has transmitted information about the location where the discharge event has occurred. A cutoff signal may be sent to the branch circuit 82 and the main circuit 81.

In the example shown in FIG. 1, since both the “monitoring device 40 and the main circuit 81” and the “monitoring device 40 and the branch circuit 82” are connected by the signal line 85, the monitoring device 40 is connected via the signal line 85. Can send a cutoff signal to the required location.

By the way, as can be understood from FIGS. 1 and 2, the branch circuit 82 provided on the secondary side of the main circuit 81 is electrically connected to the outlet 91 provided in the building. A discharge detection device 60 including a noise detection unit 61 that detects noise superimposed on the voltage or current of the electric circuit to which the load is connected is connected to the outlet 91. In the embodiment, power is supplied from the outlet 91 to the power supply unit 75 of the discharge detection device 60, and power is sent from there to the calculation unit 65 and the like.

The discharge detection device 60 of the example shown in FIGS. 7 and 8 includes a plug portion 79 connected to the outlet 91, and power is supplied to the internal device of the discharge detection device 60 through the plug portion 79. Further, the discharge event of the circuit can be detected by connecting the plug portion 79 to the outlet 91. Although it is assumed here that the plug portion 79 that can be inserted into the outlet 91 is provided, the discharge detection device 60 may be provided with a cable used for connection to the outlet 91. Further, as the present embodiment, the discharge detection device 60 connected to the outlet 91 for measurement has been described, but the load is connected to the discharge detection device 60 to form an outlet that supplies power to the connected load. Is also good. In that case, the presence or absence of a discharge event between the discharge detection device 60 and the load can also be detected.

Further, the discharge detection device 60 includes a cutoff signal output unit 67 for transmitting a cutoff signal. Therefore, a cutoff signal can be directly transmitted from the discharge detection device 60 to the main circuit 81 and the branch circuit 82 based on the result of the determination made by the discharge detection device 60. Further, the main circuit 81 and the branch circuit 82 can be cut off at the discretion of each of the monitoring device 40 and the discharge detecting device 60. When using the discharge detection device 60 that does not have the cutoff function, the monitoring device 40 may be able to exert the cutoff function. Since it is assumed that a large number of discharge detection devices 60 are required, it is more likely that economic merits will occur if the functions of the discharge detection devices 60 are limited.

The discharge detection device 60 of the example shown in FIGS. 7 and 8 is provided with a notification means 69 for transmitting information to the outside. The notification means 69 of the embodiment is designed to notify the information to the outside based on the content output by the output unit 71. The notification means 69 may be a power supply display unit 69a for displaying that the discharge detection device 60 is energized, a speaker 69b capable of outputting sound, or other devices such as the monitoring device 40. The same is true. Further, in the examples shown in FIGS. 7 and 8, in addition to the power supply display unit 69a and the speaker 69b, a detection level display unit 69c capable of displaying the detection level of noise detected by the discharge detection device 60 is provided. .. A reset button 72 capable of resetting the display of the display unit 69c is also provided on the surface of the discharge detection device 60.

The discharge detection device 60 of the embodiment is provided with the notification means 69 on the surface, and can display the determination result of the discharge detection device 60 itself. The notification means 69 may display the determination result made by the monitoring device 40.

In the embodiment, the discharge detection device 60 includes a noise detection unit 61 that detects noise generated at the time of a discharge event, and a determination unit 62 that can determine the discharge event from the information of the noise detection unit 61. The noise detection unit 61 of the embodiment is configured to detect the voltage generated between the resistors 63 of the filter unit including the CR circuit and amplify the voltage output by the amplification unit 64. The determination unit 62 of the embodiment determines that a discharge event has occurred when the threshold value is equal to or higher than the threshold value for determining the presence or absence of noise output and the condition for the elapse of a predetermined time is satisfied. It is preferable that the result of the determination by the determination unit 62 is transmitted to the monitoring device 40 as a detection signal.

The discharge detection device 60 has a calculation unit 65 built therein, and can send instructions to various devices provided in the monitoring device 40. The monitoring device 40 also includes a storage unit 66 capable of storing information. Therefore, the detected information and the calculation result can be stored.

The discharge detection device 60 of the embodiment enables individual identification on the monitoring device 40 side. Any method may be used for identifying the discharge detection device 60, but in the embodiment, the discharge detection device 60 is provided with an identification number setting unit 77. In the examples shown in FIGS. 7 and 8, the switch 78 provided in the discharge detection device 60 can be operated to identify the discharge detection device 60.

Specifically, a DIP switch is provided on the surface of the housing of the discharge detection device 60. If the individual identification number of the discharge detection device 60 is determined by operating this DIP switch, the individual identification number can be transmitted together with the detection result. In the embodiment, the individual identification number can be written as "01", "02", ..., "08" in the storage unit 66 of the discharge detection device 60 by operating the DIP switch.

When the information is transmitted from the discharge detection device 60 to the monitoring device 40, the individual identification number and the detection signal stored in the storage unit 66 of the discharge detection device 60 are transmitted. The method for transmitting data by each discharge detection device 60 is individually determined, such as every few seconds, and the information received by the monitoring device 40 in light of the determined rule, such as the receiving status of the data. May be able to identify which discharge detection device 60 is related to.

By the way, in the discharge detection system shown in FIG. 9, the discharge detection device 60 can be used as a repeater interposed between the other discharge detection device 60 and the monitoring device 40. As described above, in at least a part of the discharge detection devices 60, the communication unit 68 of each discharge detection device 60 can communicate with each other, and the detection signal of the first discharge detection device 60 is transmitted to the second discharge detection device 60. It is preferable that the configuration is such that it can be relayed and transmitted to the monitoring device 40. By doing so, even if the range in which information can be transmitted from the discharge detection device 60 is narrow due to weak radio waves or the like, the range that can be used as the discharge detection system can be expanded and transmitted to the monitoring device 40. It will be possible. In the embodiment, the discharge detection devices 60 are connected to each other by a communication line 87.

Here, an example of a method of relaying information using the discharge detection device 60 will be described. For example, when the discharge detection device 60 detects noise superimposed on the voltage or current of the electric circuit to which the load is connected, the detection signal is transmitted to another discharge detection device 60 and stored. The discharge detection device 60 that has received the detection signal transmits the information to another discharge detection device 60. By repeating such a process, finally, the monitoring device 40 and one discharge detection device 60 communicate with each other, and the discharge detection device 60 to which the detection signal is output is transmitted to the monitoring device 40.

In the embodiment, a different address is set for each discharge detection device 60, and the address is recorded in each storage unit 66. Store and send data so that the address and detection signal information are related. In the example shown in FIGS. 9 to 11, one discharge detection device 60 that communicates with the monitoring device 40 is determined, and another discharge detection is performed so that the discharge detection signal can be transmitted to the discharge detection device 60. Information is sent from the device 60. It is preferable that the information periodically passes between the plurality of discharge detection devices 60 in a specific order.

In the example shown in FIG. 10, information is sent so as to relay each discharge detection device 60, and when one of the discharge detection devices 60 outputs information that the discharge has been detected. After that, the discharge detection device 60 transmits the information including the information.

In the above example, information is assumed to flow between the discharge detection devices 60 in a specific order, and the information collected by one discharge detection device 60 is transmitted to the monitoring device 40. In this case, the information that the discharge has been detected is not shared by all the discharge detection devices 60. Since the information that such a discharge has been detected may be shared by all the discharge detection devices 60, as can be understood from FIG. 11, the discharge detection device 60 that has detected the discharge has another information. Information may be transmitted to all the discharge detection devices 60. Further, even if a discharge event has not occurred between the discharge detection devices 60 or from the discharge detection device 60 to the monitoring device 40, periodic communication may be performed. In that case, when the periodic communication is lost, the monitoring device 40 determines that the discharge detection device 60 has been unplugged from the outlet 91 or the discharge detection device 60 has failed, and the notification is different from the notification when a discharge event occurs. By displaying the display, it is possible to determine the failure or theft prevention of the discharge detection device 60.

Although the present invention has been described above by taking an embodiment as an example, the present invention is not limited to the above embodiment and can be various modes. For example, information may be exchanged between the discharge detection devices by wire or wirelessly.

8 Distribution board 40 Monitoring device 47 Shutoff signal output unit 48 Communication unit 49 Notification means 49c Display unit 54 Comparison unit 60 Discharge detection device 81 Main circuit 82 Branch circuit 91 Outlet

Claims (5)

It is a discharge detection system that detects the noise superimposed on the voltage or current of the electric circuit to which the load is connected and determines the discharge event.
A discharge detection device that detects noise superimposed on the voltage or current of the electric circuit to which the load is connected and determines the discharge event.
A monitoring device provided with a communication unit that communicates a discharge detection device and a discharge event detection signal, and a notification means for notifying the outside that a discharge event has occurred.
Equipped with
The discharge detector is connected to the outlet provided on the secondary side of the branch circuit of the distribution board.
The notification means is a discharge detection system that notifies the outside of the determination result of the discharge event when the detection signal of the discharge event sent from the discharge detection device is received. When detection signals are transmitted from multiple discharge detection devices, the monitoring device compares at least one of the noise output value, noise duration, and noise detection time of each received detection signal, and discharge events. The discharge detection system according to claim 1, further comprising a comparison unit for identifying the circuit in which the noise is generated. In at least some of the discharge detection devices, the communication units of the discharge detection devices can communicate with each other, and the detection signal of the first discharge detection device is transmitted to the monitoring device by relaying the second discharge detection device. The discharge detection system according to claim 1 or 2. The monitoring device includes a cutoff signal output unit that transmits a cutoff signal.
The discharge detection system according to claim 1, wherein when the discharge detection device receives the detection signal transmitted, the monitoring device transmits a cutoff signal to the main circuit or the branch circuit of the distribution board. The discharge detection system according to claim 1, wherein the notification means provided in the monitoring device includes a display unit that displays an individual identification number on the surface of the monitoring device.

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