Monitoring device

Abstract

To provide a monitoring device capable of monitoring an insulation state of electric facilities with higher accuracy than before.SOLUTION: Opening / closing operation of a LBS 22 installed in a high voltage power receiving facilities cubicle 3 can be detected by control means 11. When detecting the opening / closing operation of the LBS 22, the control means 11 sets dead zone time in which no occurrence of a failure is determined even if electromagnetic waves are detected by an electromagnetic detection sensor 21. Therefore, it is possible to monitor an insulating state of the high voltage power receiving facilities cubicle 3 with higher accuracy than before without erroneously detecting the occurrence of the failure related to the insulating state based on detection of the electromagnetic waves radiated due to the opening / closing operation in the LBS 22.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a monitoring device for monitoring the insulation state of, for example, high-voltage power receiving equipment. [Background technology]

[0002] It has been known that high-frequency electromagnetic waves are emitted from electrical equipment when discharge occurs due to a fault such as insulation deterioration or an abnormality. Therefore, a monitoring device has been devised that can detect faults in electrical equipment by detecting such electromagnetic waves (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-152284 Summary of the Invention [Problem to be solved by the invention]

[0004] However, even if there is no insulation deterioration, a similar discharge can occur and electromagnetic waves can be emitted when switching equipment with a switching function, such as a high-voltage AC load switch. Conventional monitoring devices have the problem that they can erroneously detect a fault based on the detection of electromagnetic waves, even though the electromagnetic waves are emitted in conjunction with such switching operations under normal conditions.

[0005] SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and aims to provide a monitoring device that can monitor the insulation state of electrical equipment with higher accuracy than conventional devices. [Means for solving the problem]

[0006] In order to achieve the above object, the invention described in claim 1 of the present invention is a monitoring device comprising electromagnetic wave detection means for detecting electromagnetic waves emitted from electrical equipment constituting a specified electrical facility, and control means for determining the insulation state of the electrical facility based on information acquired by the electromagnetic wave detection means, wherein a device with a switching function capable of opening and closing an electric circuit is installed as one component of the electrical facility, the switching operation of the device with the switching function is detectable by the control means, and when the control means detects the switching operation of the device with the switching function, it does not make a determination regarding the insulation state of the electrical facility for a specified dead band time. The invention described in claim 2 is characterized in that, in the invention described in claim 1, when the control means detects an opening or closing operation in the device with opening or closing function, it sets the dead band time starting from the detection. The invention described in claim 3 is characterized in that, in the invention described in claim 1, when the control means detects an opening or closing operation in the equipment with an opening or closing function, it sets the dead band time whose starting point is a predetermined time before the detection and whose ending point is a predetermined time after the detection. The invention described in claim 4 is characterized in that, in the invention described in any one of claims 1 to 3, the electrical equipment is provided with a contamination detection means for determining the contamination state of the electrical equipment, and the control means determines the insulation state of the electrical equipment by taking into account the information acquired by the contamination detection means. [Effects of the Invention]

[0007] According to the present invention, the control means can detect the switching operation of a switching device that is a component of electrical equipment, and when the control means detects the switching operation of the switching device, it does not make any judgment on the insulation state of the electrical equipment for a predetermined dead band time. Therefore, it is possible to monitor the insulation state of the electrical equipment with higher accuracy than conventional methods, without falsely detecting an insulation fault based on the detection of electromagnetic waves radiated by the switching operation of the switching device. Furthermore, according to the invention described in claim 3, a dead band time is set that starts from a predetermined start time before the detection of the opening / closing operation and ends from a predetermined end time after the detection. Therefore, it is possible to cope with a case where the detection signal from the electromagnetic wave detection means is detected by the control means before the signal for detecting the opening / closing operation due to, for example, the timing at which the monitoring device reads the detection signal from the sensor, and it is possible to monitor the insulation state of the electrical equipment with even higher accuracy. In addition, according to the invention described in claim 4, the electrical equipment is provided with a contamination detection means for determining the contamination state of the electrical equipment, and the control means determines the insulation state of the electrical equipment by taking into account the information acquired by the contamination detection means, so that the insulation state of the electrical equipment can be monitored with extremely high accuracy. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is an explanatory diagram showing an outline of an insulation state monitoring system. [Figure 2] FIG. 2 is a block diagram of a monitoring device. [Figure 3] FIG. 10 is an explanatory diagram showing the installation of a dust sensor in a high-voltage power receiving equipment cubicle. [Figure 4] FIG. 10 is a flowchart showing control relating to monitoring of the insulation state of the high-voltage power receiving equipment cubicle by the monitoring device. DETAILED DESCRIPTION OF THE INVENTION

[0009] A monitoring device according to an embodiment of the present invention will be described in detail below with reference to the drawings. Fig. 1 is an explanatory diagram showing an outline of an insulation state monitoring system 10. Fig. 2 is a block configuration diagram of a monitoring device 1. Fig. 3 is an explanatory diagram showing an installation state of dust sensors 23A to 23D in a high-voltage power receiving equipment cubicle 3. Fig. 4 is a flowchart showing control related to monitoring of the insulation state of the high-voltage power receiving equipment cubicle 3 by the monitoring device 1.

[0010] The insulation condition monitoring system 10 includes a monitoring device 1 that monitors the insulation condition within a high-voltage power receiving equipment cubicle 3 housing electrical equipment, a cloud server device 4, and a terminal computer 5 carried by a person in charge of safety and management of the high-voltage power receiving equipment cubicle 3. The cloud server device 4 is installed in a data center or the like and stores a database that associates information for identifying the high-voltage power receiving equipment cubicle 3 with information related to the person in charge. The terminal computer 5 is a well-known device used by the person in their office or the like and includes a display unit, an input unit, a control unit, and an email function. The monitoring device 1, the cloud server device 4, and the terminal computer 5 are connected via the Internet 2. When the monitoring device 1 outputs an alarm signal notifying the occurrence of insulation degradation, as described below, a predetermined alarm message is displayed on the display unit of the terminal computer 5 via the cloud server device 4. Note that the terminal computer 5 may be replaced with a so-called mobile terminal, such as a tablet or smartphone, carried by the person in charge.

[0011] Here, the monitoring device 1, which is the main part of the present invention, will be described. The monitoring device 1 is equipped with a control means 11 such as a CPU that determines the insulation state based on various input signals and controls the operation of the entire monitoring device 1, a memory 12 that stores the operating program of the monitoring device 1 and thresholds related to determining the insulation state, a display means 13 that displays various information, an operation means 14 for inputting various information, a communication means 15 for connecting the monitoring device 1 to the Internet 2, and an alarm means 16 such as a red light or speaker that alerts the occurrence of faults such as insulation deterioration or insulation abnormalities.

[0012] Also installed within the high-voltage power receiving equipment cubicle 3 are an electromagnetic wave detection sensor 21 for detecting high-frequency electromagnetic waves emitted from electrical equipment when a discharge occurs due to a fault such as insulation deterioration or an insulation abnormality, a high-voltage AC load break switch (hereinafter referred to as LBS) 22, which is a component of the high-voltage power receiving equipment and is a device with a switching function capable of switching a high-voltage circuit, and a dust sensor 23 for detecting dust. The electromagnetic wave detection sensor 21 is connected to the control means 11 via an electromagnetic wave information input unit 17, so that the control means 11 can detect the electromagnetic waves using the electromagnetic wave detection sensor 21. The LBS 22 is also provided with a signal output unit that outputs a contact signal indicating a change in the open / close state during an opening / closing operation (i.e., when the LBS 22 moves from an open state to a closed state or when the LBS 22 moves from a closed state to an open state), and this signal output unit is connected to the control means 11 via a contact signal input unit 18. That is, the control means 11 can detect the opening / closing operation of the LBS 22. Furthermore, the dust sensor 23 is connected to the control means 11 via the dust information input unit 19, and the control means 11 can determine whether the inside of the high-voltage power receiving equipment cubicle 3 is in a contaminated state using the dust sensor 23.

[0013] 3, a plurality of dust sensors 23A, 23B, etc. may be installed in one high-voltage power receiving equipment cubicle 3. For example, at the lower side of the high-voltage power receiving equipment cubicle 3, dust sensors 23A, 23A are installed in an air vent provided in a bottom channel base for ventilation inside the high-voltage power receiving equipment cubicle 3, and dust sensors 23B, 23B are installed in an air vent provided in the bottom plate of the high-voltage power receiving equipment cubicle 3, while at the upper side of the high-voltage power receiving equipment cubicle 3, dust sensors 23C, 23C are installed in an air vent provided in the ceiling part of the high-voltage power receiving equipment cubicle 3, and dust sensors 23D, 23D are installed at locations where the high-voltage power receiving unit is exposed on the path of an expected ascending air current, and the control means 11 may be configured to combine the detection results from a total of eight dust sensors 23A to 23D to determine whether the inside of the high-voltage power receiving equipment cubicle 3 is contaminated or not.

[0014] The monitoring and control of the insulation state of the high-voltage power receiving equipment cubicle 3 by the monitoring device 1 described above is performed as follows. First, the control means 11 determines whether the LBS 22 has performed an opening / closing operation based on whether or not a contact signal has been input from the LBS 22 (S1). Here, if the control means 11 detects that the LBS 22 has performed an opening / closing operation (determined as YES in S1), high-frequency electromagnetic waves may be emitted by the opening / closing operation of the LBS 22 even if no fault such as insulation deterioration has occurred. Therefore, a dead band time (e.g., 10 msec from the detection of the opening / closing operation of the LBS 22) is set during which the occurrence of a fault is not determined even if such electromagnetic waves are detected (S3). On the other hand, when the LBS 22 is not performing an opening / closing operation (determined as NO in S1), the control means 11 determines whether or not electromagnetic waves of a predetermined frequency that would be emitted due to insulation deterioration or an insulation abnormality have been detected based on information acquired by the electromagnetic wave detection sensor 21 (S2). However, even if electromagnetic waves are detected (YES in S2), if it is during the dead band time described above, there is a high possibility that the electromagnetic waves are emitted due to the opening and closing operation of the LBS 22. Therefore, it is determined whether the timing at which the electromagnetic waves were detected is within the dead band time (S4). If it is determined that the detection of the electromagnetic waves was not within the dead band time (NO in S4), it is determined that an insulation failure has occurred (S5), and the presence or absence of the dust sensor 23 is then determined (S6). Furthermore, if the dust sensor 23 is installed (YES in S6), it is determined whether the interior of the high-voltage power receiving equipment cubicle 3 is contaminated based on the information acquired by the dust sensor 23 (S7).

[0015] If it is determined that the interior of the high-voltage power receiving equipment cubicle 3 is contaminated (YES in S7), the reliability of the current fault detection is deemed high, and the alarm means 16 is activated in a predetermined first manner, and a first alarm signal is output via the communication means 15 to request that the display unit of the terminal computer 5 display a message stating that "a situation exists in which an insulation inspection of the high-voltage power line is recommended" (S8). If it is determined that the interior of the high-voltage power receiving equipment cubicle 3 is not contaminated (NO in S7), the reliability of the current fault detection is deemed medium, and the alarm means 16 is activated in a second manner different from the first manner, and a second alarm signal is output via the communication means 15 to request that the display unit of the terminal computer 5 display a message stating that "a situation exists in which caution and observation are required" (S9). On the other hand, if the dust sensor 23 is not installed (NO in S6), the process proceeds to S8, and the alarm means 16 is activated in the first manner, etc.

[0016] The monitoring device 1 stores the output time of the alarm signal, the type of the output alarm signal, etc. as an alarm history in the memory 12. The cloud server device 4 also stores the reception time of the alarm signal, the type of the received alarm signal, etc. as an alarm history. Furthermore, if the result of the determination in S2 is that no electromagnetic waves are detected (determined as NO in S2), or if electromagnetic waves are detected (determined as YES in S2) but the detection is within the dead band time (determined as YES in S4), control is executed to return to S1 without detecting the occurrence of a fault. In addition, the dead band time set in S3 is released when the set time has elapsed since the detection of the opening / closing operation in the LBS 22.

[0017] Furthermore, in detecting electromagnetic waves in S2, known processing is performed, such as that described in Patent Document 1. That is, the electromagnetic waves detected by the electromagnetic wave detection sensor are converted into positive unipolar current pulses, and a delay process is performed to delay the attenuation of the current. After that, an analog-to-digital converter with a relatively long sampling period converts the current pulses into digital signals, and based on the digital signals, it is determined whether or not a discharge related to the occurrence of a fault has occurred, i.e., whether or not electromagnetic waves of a predetermined frequency have been detected.

[0018] With the monitoring device 1 configured as described above, the opening and closing operation of the LBS 22 installed in the high-voltage power receiving equipment cubicle 3 can be detected by the control means 11, and when the control means 11 detects that the LBS 22 has performed an opening or closing operation, it sets a dead band time during which it will not determine that a fault has occurred even if electromagnetic waves are detected by the electromagnetic wave detection sensor 21. Therefore, it is possible to monitor the insulation state of the high-voltage power receiving equipment cubicle 3 with higher accuracy than before, without falsely detecting that a fault has occurred in the insulation state based on the detection of electromagnetic waves radiated due to the opening and closing operation of the LBS 22.

[0019] In addition, a dust sensor 23 is installed in the high-voltage power receiving equipment cubicle 3 to determine the state of contamination within the high-voltage power receiving equipment cubicle 3, and the control means 11 determines the insulation state of the high-voltage power receiving equipment cubicle 3 by taking into account the information obtained by the dust sensor 23, so that the insulation state of the high-voltage power receiving equipment cubicle 3 can be monitored with extremely high accuracy.

[0020] The monitoring device according to the present invention is not limited to the above-described embodiment, and the overall configuration of the monitoring device as well as the configuration related to determining the insulation state can be appropriately modified as needed without departing from the spirit of the present invention.

[0021] For example, in the above embodiment, a high-voltage AC load switch is installed as the device with a switching function, but there is no problem in installing other devices with a switching function, such as a high-voltage electromagnetic contactor that opens and closes the high-voltage capacitor equipment circuit, and it is of course possible to install multiple or multiple types of devices with a switching function. Furthermore, in the above embodiment, the dead band time is set with the detection of an opening / closing operation in the device with an opening / closing function as the starting point, but it is possible that the electromagnetic waves emitted in association with the opening / closing operation may be detected before the opening / closing operation in the device with an opening / closing function, depending on the timing at which the monitoring device reads the detection signal from the sensor, etc. Therefore, the dead band time may be set so as to occur around the detection of the opening / closing operation, for example, with the starting point set to 5 msec before the detection of the opening / closing operation and the end point set to 5 msec after the detection of the opening / closing operation (i.e., the dead band time is set so that the starting point is a predetermined time before the detection of the opening / closing operation and the end point is a predetermined time after the detection), and the specific way in which the dead band time is set can be changed as appropriate.

[0022] Furthermore, the control means may be configured to stop detecting electromagnetic waves by the electromagnetic wave detecting means in the dead band time. Furthermore, in the above embodiment, a dust sensor is installed as the contamination detection means, but a salt sensor can also be used. Needless to say, both a dust sensor and a salt sensor may be installed. Furthermore, in the above embodiment, a total of eight contamination detection means are installed, but the number and locations of the contamination detection means can of course be changed. For example, the contamination detection means may be installed only behind the transformer (only on the right side in FIG. 3), or may be installed near high-voltage equipment installed separately from the high-voltage power receiving unit. Conversely, if not necessary, no contamination detection means may be installed at all.

[0023] Furthermore, in the above embodiment, an alarm means is configured to be activated when a fault in the insulation state is detected, but the type, number, installation location, etc. of the alarm means can be changed as appropriate. For example, a red light may be installed in a room where some worker is present, or conversely, the alarm may be issued only externally to a terminal computer, etc., and no alarm means may be installed as part of the monitoring device. In addition, in the above embodiment, a dead band time is set to address the issue of false detection of a fault occurring during the opening and closing operation of equipment with a switching function. However, even in cases where such a dead band time is not set, the objective of improving the accuracy of monitoring the insulation state can be achieved by executing control that takes into account the detection results of the contamination detection means. [Explanation of symbols]

[0024] 1··Monitoring device, 3··High-voltage power receiving equipment cubicle (electrical equipment), 11··Control means, 21··Electromagnetic wave detection sensor (electromagnetic wave detection means), 22··High-voltage AC load switch (equipment with switching function), 23··Dust sensor (contamination detection means).

Claims

1. A monitoring device comprising: electromagnetic wave detection means for detecting electromagnetic waves emitted from an electrical device constituting a predetermined electrical facility; and control means for determining an insulation state of the electrical facility based on information acquired by the electromagnetic wave detection means, a device with a switching function capable of opening and closing an electric circuit is installed as one component of the electrical equipment, and the opening and closing operation of the device with the switching function can be detected by the control means; The monitoring device is characterized in that, when the control means detects a switching operation in the device with a switching function, it does not make any judgment regarding the insulation state of the electrical equipment for a predetermined dead band time.

2. 2. The monitoring device according to claim 1, wherein the control means, upon detecting an opening or closing operation in the device with an opening or closing function, sets the dead band time from the detection as a starting point.

3. The monitoring device according to claim 1, characterized in that, when the control means detects an opening or closing operation in the equipment with an opening or closing function, it sets the dead band time so that the start point is a predetermined time before the detection and the end point is a predetermined time after the detection.

4. The electrical equipment is provided with a contamination detection means for determining a contamination state of the electrical equipment, 4. The monitoring device according to claim 1, wherein the control means determines the insulation state of the electrical equipment by taking into account the information acquired by the contamination detection means.

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