Conductor abnormality detection device, conductor abnormality detection method, and power system monitoring system

Abstract

To early and surely detect abnormality of a conductor in a power system.SOLUTION: The present invention provides a conductor abnormality detection device including a detection unit configured to monitor a state of a conductor of a power system and detect a predetermined abnormality, and an alarm unit configured to issue an alarm based on detection of the abnormality by the detection unit. The detection unit may be configured to monitor a state of main circuit power supplied to the conductor and detect the predetermined abnormality of the main circuit power.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present technology relates to detecting faults in conductors in power systems. [Background technology]

[0002] In power systems, particularly in facilities such as solar power plants where conductors are laid over a wide area, there is a risk that the conductors may be stolen or accidentally damaged, which may affect the stable operation of the system.To address this issue, for example, Patent Document 1 discloses a technology in which a reflector is provided on the inside of the lid of a container, and the state of the lid is monitored based on whether a signal transmitted from a wireless communication device inside the container is reflected or received depending on the closed state of the lid, thereby preventing theft of the contents, etc. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2021 / 100870 Summary of the Invention [Problem to be solved by the invention]

[0004] In the power systems described above, if a physical abnormality such as a break or damage to a conductor occurs, it is desirable to quickly and reliably detect it and take appropriate action from the perspective of stable system operation and asset protection. However, early detection of an abnormality can be difficult, especially in large areas or unmanned environments.

[0005] The present invention has been made in view of the above circumstances, and has as its main object to provide a technique that enables early and reliable detection of abnormalities in conductors in a power system. [Means for solving the problem]

[0006] The present invention provides a detector configured to monitor the condition of a conductor of the power system and detect a predetermined anomaly; and an alarm unit configured to issue an alarm based on the detection of the abnormality by the detection unit. The detection unit may be configured to monitor a state of the main circuit power supplied to the conductor and detect the predetermined abnormality in the main circuit power. The detection unit a monitoring signal supply unit that supplies a monitoring signal to the conductor from a monitoring power supply separate from the main circuit power; and a supervisory signal detector that detects the predetermined abnormality in the conductor based on a transmission state of the supervisory signal through the conductor. The alarm unit may be configured to issue the alarm if the abnormality in the main circuit power continues even after a predetermined time has elapsed since the detection unit detected the abnormality. The predetermined time may be between 5 seconds and 90 seconds. The predetermined abnormality of the main circuit power may be a loss of supply of the main circuit power or a voltage drop below a predetermined threshold. the supervisory signal supply unit is configured to supply a DC supervisory signal; The supervisory signal detector may be configured to detect an abnormality in the conductor based on a continuity state of the DC supervisory signal. The supervisory power supply may include an uninterruptible power supply. The alarm unit may be configured to issue the alarm without waiting for a predetermined time to elapse when the monitor signal detection unit detects an abnormality in the conductor. The alarm unit may be configured to output at least one of a visible light, an audible sound, and an operation instruction signal to an external device as the alarm. The alarm unit may be configured to transmit a notification signal to a remote monitoring system when the alarm is issued. The conductor abnormality detection device further comprises: a dummy conductor provided separately from the conductor and capable of detecting a break; The power supply may further include a signal path for causing the alarm unit to issue an alarm without waiting for the predetermined time to elapse when a break in the dummy conductor is detected. The dummy conductors may have a similar size, color, or material to the conductors. The detection unit may include a sensor unit disposed near the conductor, and a logic unit housed in a separate housing connected to the sensor unit via a signal line. the detection unit is configured to monitor a state of the conductor at a plurality of monitoring points; The alarm unit may be configured to issue the alarm only when the abnormality is detected in at least two of the plurality of monitoring locations. The present invention also provides a detection step of monitoring the condition of the conductors of the power system; and an alarm step of issuing an alarm based on the detection of a predetermined abnormality in the detection step. The warning step may issue the warning if the abnormality continues even after a predetermined time has elapsed since the abnormality was detected in the detection step. the detecting step includes a step of supplying a monitoring signal to the conductor from a monitoring power supply separate from the main circuit power, and detecting an abnormality in the conductor based on a transmission state of the monitoring signal through the conductor; The warning step may issue the warning without waiting for a predetermined time to elapse when an abnormality in the conductor is detected. The conductor abnormality detection method further includes: a dummy detection step of detecting disconnection of a dummy conductor provided separately from the conductor; The method may further include a step of issuing an alarm in the alarming step without waiting for the predetermined time to elapse if a break in the dummy conductor is detected in the dummy detecting step. The present invention also provides a conductor abnormality detection device including: a detection unit configured to monitor the state of a conductor of a power system and detect a predetermined abnormality; and an alarm unit configured to issue an alarm based on the detection of the abnormality by the detection unit and to transmit a notification signal to a remote monitoring system; and the monitoring system configured to receive the notification signal from the conductor abnormality detection device and execute a predetermined response process. [Effects of the Invention]

[0007] According to the present technology, it is possible to detect abnormalities in conductors in a power system early and reliably, thereby contributing to the stable operation of the power system and the protection of equipment. Note that the effects described in this specification are merely examples and are not limiting, and other effects may also be obtained. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a schematic diagram showing a configuration example of a power system to which a conductor abnormality detection device according to a first embodiment of the present invention is applied. [Figure 2] FIG. 2 is a schematic diagram showing an image of mounting a dummy conductor according to one embodiment of the present invention. [Figure 3] 1 is a flowchart showing a basic flow of a conductor abnormality detection method according to the present invention. [Figure 4] 10 is a flowchart showing another flow of the conductor abnormality detection method according to the present invention (when a dummy conductor is included). [Figure 5] FIG. 10 is a schematic diagram showing a configuration example of a power system to which a conductor abnormality detection device according to a second embodiment of the present invention is applied. [Figure 6] 10 is a flowchart showing still another flow of the conductor abnormality detection method according to the present invention (in the case of a superposition monitoring circuit system). DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment of the present invention (hereinafter also referred to as "the present embodiment") will be described in detail with reference to the drawings. Note that the drawings referred to in the following description are schematic drawings for facilitating understanding of the present invention, and may differ from the actual dimensions and scale.

[0010] In this specification and drawings, components having the same or equivalent functions are denoted by the same reference numerals, and redundant explanations are omitted where appropriate. Furthermore, terms with "substantially" attached, such as "substantially parallel" and "substantially perpendicular," are used to encompass not only the strict meaning (e.g., completely parallel) but also a range that can be considered to be essentially that state (e.g., an angular deviation of about ±10 degrees), including manufacturing tolerances and slight intentional deviations. Unless otherwise specified, "upper," "lower," "left," and "right" indicate relative directions in the drawings.

[0011] The present embodiment shows an example of the best mode currently considered to be the mode for carrying out the present invention, and is not limited to this. As will be described later, the components and features shown in each embodiment can be combined in any manner within the scope of technical compatibility.

[0012] In this specification, the description will be given in the following order. 1. Basic configuration of the detection device 2. First embodiment (main circuit power monitoring method) 2.1 Configuration (1) Detection unit 11 (2) Delay function (3) Alarm part 2 (4) Dummy conductor (5) Multiple location monitoring (6) Separate sensor configuration 2.2 Operation (1) Basic operation (2) Operation when dummy conductors are included (3) Operation when multiple locations are monitored 2.3 Actions and Effects 3. Second embodiment (superimposed monitoring circuit system) 3.1 Configuration (1) Detection unit 11A (2) Alarm part 2 (3) Combination of DC and AC sides 3.2 Operation 3.3 Actions and Effects 3.4 Abnormality Location Identification Function (Modification of the Second Embodiment) (1) Composition (2) Operation (3) Actions and Effects 4. Monitoring System (1) Installation location and hardware configuration example (2) Software processing example (3) Examples of types of response processing 5. Variations

[0013] [1. Basic configuration of the detection device] The conductor abnormality detection device 100 according to the present invention has a main purpose of monitoring the condition of conductors (power transmission lines including electric wires, wiring, cables, bus bars, etc.) laid in a power system (for example, a solar power plant, a power transmission and distribution network, or power equipment in a factory) and detecting a predetermined abnormality that has occurred in the conductor (for example, a physical cut, disconnection, short circuit, ground fault, or deterioration of characteristics, etc.).

[0014] 1 and 5, the conductor abnormality detection device 100 basically comprises a detection unit configured to monitor the state of the conductor and detect a predetermined abnormality, and an alarm unit configured to issue an alarm based on the abnormality detected by the detection unit. The detection unit and the alarm unit may be housed in an integrated housing, or may be housed in separate housings and connected by a signal line, wireless communication, etc.

[0015] The "detection unit" is a part that has the function of acquiring information indicating the physical or electrical state of the conductor to be monitored and determining whether or not there is an abnormality based on that information. There are various specific methods for detecting abnormalities, such as the first embodiment (main circuit power monitoring method) and the second embodiment (superimposed monitoring circuit method) described below.

[0016] The "alarm unit" receives a signal indicating an abnormality from the detector and performs a predetermined alarm action, such as issuing a visual light or audible alarm or sending a notification to a remote system.

[0017] [2. First embodiment (main circuit power monitoring method)] First, a first embodiment of the present invention will be described mainly with reference to Fig. 1. Fig. 1 is a schematic diagram showing an example of the configuration of a power system to which a conductor abnormality detection device according to the first embodiment of the present invention is applied. This embodiment is particularly suitable for detecting conductor abnormalities in a solar power plant in which multiple small, distributed power conditioners (hereinafter referred to as "PCS") 3 are installed.

[0018] [2.1 Configuration] As shown in Fig. 1, a solar power plant to which this embodiment is applied has PCSs 3 installed in a distributed manner, each of which converts DC power generated by a plurality of solar cell modules 31 into AC power. The AC power from each PCS 3 is collected in an AC current collection box 4 via a power conditioner trunk wiring 81 (an example of a "conductor" in this embodiment), and is further connected to the power grid via an AC trunk wiring 82 (another example of a "conductor"), a service switchboard 5, a substation 6, a utility pole 7, and the like. These conductors, particularly the power conditioner trunk wiring 81 and the AC trunk wiring 82 that connect the PCSs 3 and the AC current collection box 4, etc., are laid over a relatively long distance and are therefore susceptible to theft and damage.

[0019] The conductor abnormality detection device 100 of this embodiment is installed in such a power system. In the example of Fig. 1, it is installed near each PCS 3 or inside the housing of the PCS 3. The conductor abnormality detection device 100 includes a detection unit 11 and an alarm unit 2.

[0020] <(1) Detection unit 11> The detection unit 11 in this embodiment is configured to monitor the state of the main circuit power supplied to a conductor to be monitored (for example, the power conditioner trunk wiring 81) and detect a predetermined abnormality in the main circuit power.

[0021] Specifically, a detection unit 11 is connected to the AC output terminals (e.g., three-phase 440V) of the PCS 3 via detection wiring 91. The detection unit 11 includes a transformer 12 (e.g., 440V / 100V) for converting the voltage of the main circuit power to a level suitable for detection and processing, and a logic unit 13 for determining an abnormality based on the converted voltage. The voltage detection section including this transformer 12 corresponds to the sensor section in a broad sense, and an abnormality determination circuit including a delay timer and the like, which will be described later, corresponds to the logic unit 13.

[0022] The logic unit 13 is configured to monitor signals from the sensor unit (for example, the presence or absence and level of voltage on the secondary side of the transformer) and detect abnormalities in the main circuit power, specifically, loss of power supply (power outage or complete disconnection) or voltage drop below a predetermined threshold (incomplete contact, abnormality on the grid side, etc.) (these are examples of the "predetermined abnormality in the main circuit power" recited in the claims). The threshold is set in advance depending on the characteristics of the system and the type of abnormality to be detected.

[0023] <(2) Delay function> In power systems, power outages (momentary power outages) and voltage drops (momentary voltage drops) can occur for very short periods (milliseconds to a few seconds) due to lightning strikes or accidents in other locations. These are usually temporary phenomena that do not require any action as they usually recover naturally. If an alarm is triggered by such a temporary phenomenon, it will be a false alarm and reduce the reliability of the system.

[0024] Therefore, it is recommended that the detection device 100 of this embodiment (especially the logic unit 13) be provided with a "delay function." This function is configured so that even if the detection unit 11 detects an abnormality in the main circuit power, it does not immediately issue an alarm, but issues an alarm only if the abnormal state continues for a predetermined time.

[0025] In the example of Fig. 1, this delay function is realized by a power-off delay timer 13. The power-off delay timer 13 maintains the on state (or off state) while the input power (supplied from the secondary side of the transformer 12) is normal, and when the input power is turned off (an abnormality is detected), it switches its state (for example, closes a contact that outputs an alarm signal) only after a set delay time has elapsed.

[0026] This delay time (the "predetermined time" in the claims) is set after taking into consideration a comprehensive range of factors, including the need to effectively suppress unnecessary alarms (false alarms) caused by very short-term momentary power outages or momentary voltage drops (for example, those lasting from 0.02 to 2 seconds that can occur in the power system or facility), while detecting actual persistent abnormalities (such as breaks or damage to conductors that require action) as early as possible, and the need to reliably prevent false alarms caused by automatic re-transmission of power after a temporary supply interruption due to the power company's system protection operation (generally after about one minute).

[0027] Specifically, the predetermined time is preferably set in the range of 5 to 90 seconds. By setting the lower limit to about 5 seconds, false alarms caused by short-term power fluctuations that will be resolved in a few seconds can be eliminated, and a relatively early warning can be issued for abnormalities that continue for longer than that.

[0028] On the other hand, when considering the upper limit, it is important to consider the case where a power company temporarily disconnects a transmission point affected by a lightning strike or other cause, and then automatically attempts to retransmit power after safety confirmation and removal of the fault (e.g., a case where retransmission begins approximately one minute later). In such cases, to prevent the temporary restoration of power supply due to retransmission from being mistaken for the resolution of the abnormality and triggering an alarm, it is effective to set the predetermined time longer than the retransmission time. For example, by setting the predetermined time to a range between more than 60 seconds and 90 seconds, or a range around 90 seconds, it is possible to reliably exclude such temporary restorations due to grid operations by the power company, accurately identify only persistent abnormalities that truly require response, and increase the reliability of the alarm.

[0029] This specific "predetermined time" is adjusted to an optimal value by comprehensively considering the stability of the power grid at the installation site, the frequency of lightning, the immediacy of the required warning, as well as the characteristics of the target power system and the actual system operation status of the competent power company (such as retransmission policy).

[0030] <(3) Alarm part 2> When the alarm unit 2 receives a signal indicating that the abnormality continues from the detection unit 11 (specifically, the logic unit 13), it executes a predetermined alarm operation.

[0031] Alarms can take various forms. In the example of Figure 1, a rotating light 22 (an example of "visible light" in the claims) is included to visually notify the site of an abnormality. In addition to, or instead of, this, a device that emits an audible sound, such as a siren or buzzer, may be provided. It is also possible to provide an interface that outputs an operation instruction signal to external devices, such as a surveillance camera system or an access control system, to prompt coordinated action (start recording, lock the gate, etc.) when an abnormality occurs. The alarm unit 2 has at least one of these alarm output functions.

[0032] Furthermore, it is extremely important from an operational perspective that the alarm unit 2 has the function of transmitting a notification signal to a remote monitoring system (for example, a 24-hour monitoring center or a manager's terminal) when an alarm is issued. In FIG. 1, a signal is sent from the alarm panel 21 to the remote monitoring system (not shown). Depending on the installation location, this communication can be via wireless communication such as a mobile phone network such as LTE or low-power wide-area wireless communication such as LPWA (Low Power Wide Area), or wired communication using optical fiber or LAN cable (these communication methods are examples of methods for transmitting notification signals). This remote notification function allows for immediate detection of an abnormality even in an unmanned environment, enabling rapid response such as dispatching security guards or contacting relevant parties.

[0033] <(4) Dummy conductor> In this embodiment, a dummy conductor 89 can be employed for the purpose of further preventing theft and early detection.

[0034] FIG. 2 is a schematic diagram showing an implementation image of a dummy conductor according to one embodiment of the present invention. As shown in FIG. 2, a dummy conductor 89 capable of detecting disconnection is installed separately from the actual conductor (e.g., power conditioner trunk wiring 81). This dummy conductor 89 is not electrically involved in the main circuit (or transmits only a low-voltage monitoring signal), but it preferably has a size (thickness), color, or material similar to that of the actual conductor so that a tamperer can mistake it for the actual conductor. For example, a wiring that looks similar to the actual trunk wiring is used, and it is installed (e.g., buried about 300 mm underground) in a location that is prone to disconnection, such as near the route where the trunk wiring is installed, as if it were real wiring.

[0035] The breakage of the dummy conductor 89 can be detected, for example, by passing a thin electric wire through it to form a loop circuit and monitoring its continuity, or by monitoring for a break in light through an optical fiber (this detection circuit forms part of the configuration ``capable of detecting breakage'' in the claim).

[0036] An important point is the signal path when disconnection of the dummy conductor 89 is detected. This disconnection detection signal is connected so as to immediately cause the alarm unit 2 to issue an alarm without waiting for the delay function (predetermined time) to elapse (the "signal path" in the claims). This can be realized, for example, by connecting the output of the disconnection detection circuit directly to the trigger input of the alarm unit 2, bypassing the power-off delay timer 13, or by processing the dummy conductor disconnection signal as the highest priority immediate alarm trigger in the logic unit.

[0037] (5) Monitoring multiple locations As shown in Figure 1, particularly in distributed power plants where multiple PCS3s are installed, a "multiple-location monitoring" configuration can be adopted to reduce false alarms caused by failures of a single PCS3 (such as internal breaker tripping) or a single detection device 100, and to increase the reliability of alarms.

[0038] In this configuration, the detection unit 11 monitors the status of multiple monitoring locations (for example, the detection units of the respective detection devices corresponding to two adjacent PCSs 3, or multiple detection units monitoring different sections on the same power path).The alarm unit 2 (or an associated alarm panel or monitoring system) is configured to issue a full-scale alarm (for example, a remote notification or a loud siren) only when an abnormality is detected simultaneously (or within a predetermined short time window) at least two of the multiple monitoring locations.

[0039] For example, an alarm panel 21 (or a similar unit) can receive abnormal signals (break signals) from detection devices attached to two adjacent PCS3, and can set up logic (AND condition) that issues a more serious alarm (for example, a response that involves calling the police) only if both signals indicate an abnormality. This configuration can prevent false alarms from being issued due to a failure in a single piece of equipment.

[0040] <(6) Separate sensor configuration> The physical configuration of the detection unit 11 can also be such that the sensor unit and the logic unit 13 are separated. That is, the sensor unit (e.g., a small voltage sensor, current transformer, or unit including the transformer 12) that detects voltage and current is located near the conductor to be monitored (such as the terminal board of the PCS 3), while the logic unit 13 (including a power-off delay timer, relay circuit, microcontroller, etc.) that performs abnormality detection, delay processing, and signal output to the alarm unit is housed in a separate housing installed in a location that allows for easy maintenance or a good communication environment, and the two are connected via a signal line. This separate sensor configuration allows the optimal installation locations for the sensor and the logic unit (and alarm unit) to be selected independently, offering the advantage of improved installation flexibility and ease of maintenance.

[0041] [2.2 Operation] Next, the operation of the conductor abnormality detection device 100 of the first embodiment having the above configuration will be described with reference to Fig. 3 and Fig. 4. Fig. 3 shows the basic operation (main circuit power monitoring + delay), and Fig. 4 is a flowchart showing the operation when a dummy conductor is included.

[0042] <(1) Basic operation> As shown in FIG. 3, first, the detection unit 11 constantly or periodically monitors the state of the main circuit power of the conductor to be monitored (step S101: detection step. Specifically, the detection unit 11 acquires the voltage level etc. via the transformer 12 etc.).

[0043] Next, the logic unit 13 determines whether the acquired state is normal or corresponds to a predetermined abnormality (loss of supply or voltage drop) (step S102: abnormality determination).

[0044] If no abnormality is detected (No in S102), monitoring continues. If an abnormality is detected (Yes in S102), a delay function is activated. The logic unit 13 (e.g., a power-off delay timer) starts a timer and waits until a predetermined time (e.g., 10 seconds) has elapsed (step S103: start delay timer).

[0045] After a predetermined time has elapsed, the state of the main circuit power is checked again to determine whether the abnormality continues (step S104: abnormality continuation determination). If the abnormality is resolved within the predetermined time (No in S104), it is determined to be a temporary phenomenon, and the system returns to monitoring mode without issuing an alarm. If the abnormality continues for the predetermined time (Yes in S104), it is determined to be a persistent abnormality, and an alarm activation signal is output to the alarm unit 2.

[0046] Upon receiving the alarm activation signal, the alarm unit 2 executes a predetermined alarm operation (visible light, audible sound, remote notification, etc.) (step S105: alarm step). If the remote notification function is enabled, a notification signal is sent to the monitoring system in this step.

[0047] <(2) Operation when dummy conductors are included> When the dummy conductor 89 is installed, disconnection of the dummy conductor is detected in parallel with the above basic operation.

[0048] As shown in FIG. 4, the dummy conductor cutoff detection circuit monitors the state (continuity, etc.) of the dummy conductor (step S201: dummy detection step).

[0049] If no break is detected in the dummy conductor (No in S201), the basic operation (S101 to S105 in FIG. 3) is executed.

[0050] If a break in the dummy conductor is detected (Yes in S201), the delay timer is bypassed and an alarm activation signal is immediately output to the alarm unit 2 via a special signal path.

[0051] Upon receiving this signal, the alarm unit 2 immediately executes an alarm operation (step S105: alarm step, which corresponds to "a step of issuing an alarm in the alarm step without waiting for the lapse of a predetermined time" in the claims).

[0052] <(3) Operation when multiple locations are monitored> When a multiple-location monitoring configuration is adopted, an additional condition determination is made in the final determination of whether to issue an alarm in step S105 above. That is, the alarm unit 2 (or the coordination unit) determines whether abnormal signals (delayed or immediate) are being input simultaneously (or within a short period of time) from multiple monitoring locations (for example, two or more locations). Only when this condition is met is a full-scale alarm (such as a high-level alarm or remote notification) issued, and when an abnormality is detected in only a single location, the alarm level is suppressed (for example, only an on-site display is displayed, or no alarm is issued).

[0053] [2.3 Actions and Effects] According to the first embodiment configured as above, the following actions and effects can be expected.

[0054] First, the detection unit 11 monitors the state of the main circuit power, thereby making it possible to detect abnormalities occurring in conductors such as the power conditioner trunk wiring 81 (power supply interruption or voltage drop due to disconnection, breakage, poor contact, etc.).

[0055] In particular, by providing a delay function, it is possible to effectively suppress the occurrence of unnecessary alarms (false alarms) caused by temporary fluctuations in the power system, such as momentary power outages and momentary voltage drops, which improves the reliability of the alarm system, prevents unnecessary dispatches of security guards and excessive alerts to managers, and contributes to reducing operating costs.

[0056] Furthermore, by adopting a dummy conductor configuration, if a fraudster first cuts the dummy conductor, an alarm can be issued immediately without any delay and without affecting the power generation system itself. This increases the threat and deterrent effect in the early stages of a crime, and may prevent secondary damage such as loss of electricity sales due to the cutting of the actual conductor.

[0057] Furthermore, by adopting a multi-point monitoring configuration, the possibility of false alarms due to a single device failure or malfunction can be further reduced. Because an alarm is only issued if an abnormality is detected simultaneously in multiple points, the reliability of the alarm is improved, and it becomes possible to take prompt and appropriate action (such as a full-scale response, including reporting to the police) based on a more accurate assessment of the situation (for example, a judgment that there is a high possibility of widespread damage or a serious incident).

[0058] In addition, the alarm output uses visible light and audible sound to warn and intimidate on-site, and also notifies a remote monitoring system, contributing to early detection of abnormalities and the establishment of a rapid response system.

[0059] The sensor-separated configuration alleviates restrictions on installation locations and increases the degree of freedom in design and construction.

[0060] [3. Second embodiment (superimposed monitoring circuit system)] Next, a second embodiment of the present invention will be described mainly with reference to Fig. 5. This embodiment is particularly suitable for detecting abnormalities in conductors (for example, DC wiring 85, 86 extending from solar cell module 31 through connection box 32 to PCS 3A) that may be in a state where no main circuit power is supplied (no voltage state) at night or other times in a solar power plant where a large-scale centralized PCS 3A is installed.

[0061] [3.1 Configuration] As shown in Fig. 5, in a solar power plant to which this embodiment is applied, DC power from a large number of solar cell modules 31 is collected in a junction box 32 and sent to a large-scale centralized PCS 3A through DC wiring 85, 86 (an example of a "conductor" in this embodiment). The power converted to AC in the PCS 3A is connected to the power grid via a switch 33 or the like. These DC wiring 85, 86 are in a state where no voltage is applied during the night or other times when no power generation is being performed.

[0062] The conductor abnormality detection device 100A of this embodiment employs a "superimposed monitoring circuit system" to detect such abnormalities (particularly breakage) in the DC wiring 85, 86. The detection device 100A includes a detection unit 11A and an alarm unit 2.

[0063] <(1) Detector 11A> The detection unit 11A includes a monitoring signal supply unit 14 that supplies a monitoring signal to the conductor to be monitored (DC wiring 85, 86) from a monitoring power source separate from the main circuit power (power generated from the solar cell), and a monitoring signal detection unit 15 that detects an abnormality in the conductor based on whether the monitoring signal is being transmitted normally through the conductor.

[0064] In order to supply a stable monitoring signal, the monitoring signal supply unit 14 preferably converts commercial AC power (100 V AC) into a low DC voltage (e.g., 24 V DC, an example of a "DC monitoring signal") using an AC / DC converter 141, and further includes an uninterruptible power supply (UPS) 142 so that monitoring can continue even during a power outage. This 24 V DC monitoring signal is applied (superimposed) between, for example, both ends of the P line and the N line of the DC wiring 85, 86, or between one of the lines and the ground (earth).

[0065] The monitoring signal detection unit 15 includes, for example, a sensing relay (such as a relay operating on DC 24V, which is an example of a configuration that "detects an abnormality in the conductor based on the continuity state of a DC monitoring signal") installed at the end of the loop through which the monitoring signal flows or on the path. If the conductor is normal and the monitoring signal is flowing, the sensing relay remains excited (on or off), but if the conductor is cut or the continuity of the monitoring signal is lost, the state of the sensing relay changes and a signal (break signal) indicating an abnormality is output.

[0066] This superimposed monitoring circuit method does not depend on the state of the main circuit power, and the power supply is stable due to the UPS, so if an abnormality (disconnection) in the conductor is detected, it can be configured to issue an alarm without waiting for the passage of a specified time (effectively with no delay), and this is also recommended (immediate alarm).

[0067] <(2) Alarm part 2> The alarm unit 2 executes a predetermined alarm operation when it receives a signal indicating an abnormality from the monitoring signal detection unit 15 (sensing relay). The alarm format (visible light, audible sound, operation instruction signal) and remote notification function are the same as those in the first embodiment. In the example of Figure 5, an alarm panel 21 and a rotating light 22 are shown.

[0068] <(3) Combination of DC and AC sides> In the example of Fig. 5, in addition to monitoring the DC wiring 85, 86 (superimposed monitoring circuit method), a configuration is also provided in which conductor abnormalities on the AC side after PCS 3A are monitored using the same main circuit power monitoring method as in the first embodiment (for example, with a delay function using power off delay timer 13). Both the DC side abnormality detection signal (from detection unit 11A) and the AC side abnormality detection signal (from detection unit 11) are input to alarm unit 2, and it is preferable that the signals are processed using logic (OR condition) to issue an alarm if an abnormality is detected on either side. This makes it possible to respond to conductor abnormalities on both the DC and AC sides.

[0069] [3.2 Operation] Next, the operation of the conductor abnormality detection device 100A of the second embodiment will be described with reference to Fig. 6. Fig. 6 is a flowchart showing the flow of the conductor abnormality detection method according to the present invention (in the case of a superposition monitoring circuit system).

[0070] First, the monitoring signal supplying unit 14 constantly supplies a monitoring signal (DC 24V) to the conductors (DC wirings 85, 86) to be monitored (step S301).

[0071] The supervisory signal detector 15 (sensing relay) monitors whether this supervisory signal is being transmitted normally (whether there is continuity) (step S302).

[0072] If continuity is confirmed in the detection step of step S303 (Yes in S303), monitoring continues. If continuity is lost (No in S303), it is determined that an abnormality such as a break has occurred in the conductor, and an alarm activation signal is output to the alarm unit 2.

[0073] Upon receiving this signal, the alarm unit 2 immediately executes a predetermined alarm action (visible light, audible sound, remote notification, etc.) without waiting for a delay time (step S304: immediate alarm step).

[0074] If AC side monitoring is also installed, the corresponding operation similar to that shown in Figure 3 (with delay function) will also be performed in parallel, and the final alarm operation will be triggered by the detection of either abnormality (immediate alarm on the DC side or delayed alarm on the AC side) (OR condition).

[0075] [3.3 Actions and Effects] According to the second embodiment configured as above, the following actions and effects can be expected.

[0076] By adopting the superimposed monitoring circuit method, it is possible to reliably detect abnormalities (such as breaks) in conductors (especially DC wiring) even at night when main circuit power is not being supplied or when power generation is stopped.

[0077] By incorporating a UPS, monitoring functions can be maintained even during a power outage in the power grid, improving the reliability of the system.

[0078] By issuing an alarm immediately based on the detection of an abnormality in the surveillance signal, the time from the occurrence of an abnormality to its detection can be shortened, enabling a faster response (for example, deterring a crime or increasing the possibility of arresting a criminal in the act).

[0079] Furthermore, similar to the first embodiment, the alarm output and remote notification functions enable effective reporting and response coordination.

[0080] By combining DC side monitoring and AC side monitoring, it is possible to respond to conductor abnormalities on both the DC and AC sides, strengthening the monitoring network for the entire power system.

[0081] [3.4 Abnormality Location Identification Function (Modification of the Second Embodiment)] As a further developed variant of the second embodiment (superimposed monitoring circuit system), it is possible to add a function to not only detect the presence or absence of an abnormality in a conductor but also to estimate the location where the abnormality has occurred. This variant will be described below.

[0082] <(1) Configuration> To realize this modification, the following elements are added or changed in addition to the configuration of the second embodiment.

[0083] The monitoring signal supply unit 14 may include, in addition to or instead of a simple DC voltage source, a pulse signal generator that generates a pulse signal having a specific shape (e.g., a short pulse with a steep rising edge), or a swept frequency signal generator that generates a signal in a specific frequency band.

[0084] Furthermore, the monitoring signal detector 15 or a signal processor separately provided within the detector 11A includes a signal analyzer that receives a signal (reflected signal) that is transmitted to the conductor and reflected back from an abnormality and analyzes its characteristics. The signal analyzer can be configured, for example, with a high-speed A / D converter, a signal processing processor (DSP, FPGA, microcontroller, etc.), and software (or a dedicated hardware circuit) that executes an analysis algorithm.

[0085] <(2) Operation> The operation of this modified example is outlined below.

[0086] A pulse signal generator or the like of the monitoring signal supply unit 14 transmits a predetermined pulse signal or frequency signal from one end or both ends of the conductor to be monitored (for example, DC wiring 85, 86).

[0087] If there is an impedance mismatch, or anomaly, on the conductor (for example, an open end due to a break, a short circuit, a ground fault, or a significant deterioration in the cable), part or all of the transmitted signal will be reflected at the anomaly.

[0088] The signal analysis unit receives the transmitted signal and the reflected signal returning from the conductor. It then measures the time difference (propagation delay time) between the transmitted pulse and the reflected pulse based on the principles of time domain reflectometry (TDR). Because the signal propagation speed in the conductor is known, this time difference can be used to calculate the distance from the point where the signal was transmitted to the anomaly. Alternatively, it is possible to analyze the frequency response (changes in amplitude and phase) of the transmitted signal and the reflected signal based on the principles of frequency domain reflectometry (FDR), and estimate the location and type of anomaly (such as an open circuit or short circuit) from the pattern.

[0089] The signal analysis unit generates calculated or estimated abnormality position information and outputs this together with alarm information (abnormality detection signal) to the alarm unit 2 and / or a remote monitoring system. The monitoring system can display this position information on a map or the like to present it to monitors in an easy-to-understand manner.

[0090] <(3) Actions and Effects> According to this modified example having an anomaly location identification function, when an anomaly occurs in a conductor, not only can the presence or absence of the anomaly be determined, but also location information indicating where the anomaly occurred can be obtained.

[0091] This eliminates the need for search work to identify abnormalities, particularly in cases such as solar power plants where conductors are laid over long distances over vast sites, and has the remarkable effect of significantly reducing the time, effort, and costs required for inspection and restoration work. This also leads to shorter periods when power generation is down, greatly contributing to improving the operational efficiency of power systems. Although the measurement principles of TDR and FDR are well known, applying these principles to various conductors (multi-core cables, branched structures, noise environments) in solar power plants as part of the superimposed monitoring system of the present invention and constructing specific signal generation methods, signal processing algorithms including noise removal, and decision logic to identify abnormality locations with practical accuracy may involve unique technical ingenuity.

[0092] [4. Monitoring System] Next, we will explain a specific configuration example, processing content, and types of response processing for the "monitoring system," which is one of the components of the "power system monitoring system." This monitoring system receives notification signals transmitted by the alarm unit 2 from one or more conductor abnormality detection devices 100 (or 100A), and performs predetermined response processing based on the received information.

[0093] <(1) Installation location and hardware configuration example> The monitoring system is typically built in a remote monitoring center, data center, or cloud computing environment that manages the operation of the power system. The hardware configuration may include, but is not limited to, the following elements:

[0094] Communication interface unit: An interface for sending and receiving notification signals to and from the conductor abnormality detection device. This includes a modem, router, network card, etc. that is compatible with the communication method used (LTE, 5G, LPWA, wired LAN, optical fiber, etc.). It may be compatible with multiple communication methods.

[0095] Processing unit: A computer that processes the received notification signal and performs various calculations, judgments, controls, etc. This may be a server computer, workstation, PC, or dedicated control device equipped with a CPU (Central Processing Unit), RAM (Random Access Memory), ROM (Read-On Memory), etc.

[0096] Memory unit: A storage device for permanently saving received anomaly information, date and time, detection device identification information, response history, power plant equipment information, map information, user account information, various setting values, etc. A hard disk drive (HDD), solid state drive (SSD), or a network-connected database server can be used.

[0097] Display unit: A display device that allows the monitor (operator) to visually check the system status, location of abnormalities, response status, etc. A video wall combining multiple monitors may also be used.

[0098] Input unit: A device used by monitors to operate the system, check information, input response instructions, change settings, etc. This includes a keyboard, mouse, touch panel, etc.

[0099] Alarm unit: A device used to notify the monitoring staff in the monitoring center of any abnormalities. Possible devices include a speaker that emits a warning sound, a warning light (such as PATLITE (registered trademark)), or a vibrator.

[0100] External linkage interface: An interface for linking data with other external systems as needed, such as security company systems, police and fire emergency notification systems, power company grid management systems, customer relationship management systems (CRM), and building management systems (BMS).

[0101] <(2) Software processing example> The processing unit (computer) of the monitoring system runs software (programs) to realize the following functions. These functions may be implemented as a single piece of software, or may operate in cooperation with multiple modules or services.

[0102] Reception and analysis process: Receives and analyzes the notification signal (e.g., a data packet in a specific format) sent from the conductor abnormality detection device. Extracts information such as the detection device ID, type of abnormality (e.g., main circuit power loss, voltage drop, dummy conductor breakage, simultaneous abnormalities in multiple locations, or other information that can be determined on the detection device side), time of occurrence, and sensor value (if any).

[0103] Database management processing: Analyzed information is recorded in a database (storage unit) in association with power plant information and equipment information. Information such as the response status and person in charge is also updated as needed and managed as a history.

[0104] Anomaly judgment and importance evaluation processing: The urgency and importance of the anomaly are evaluated based on the received information. For example, the priority of the response is determined taking into account whether it is a single anomaly or multiple simultaneous anomalies, whether the dummy conductor is broken, and the duration of the anomaly. Analysis can also be performed based on similar past cases and statistical data.

[0105] Map and status display processing: Links with the power plant's map information and displays the location of the detection device where an abnormality occurred on the map. The type of abnormality, the time of occurrence, the current status, etc. are displayed on the display using an easy-to-understand user interface (GUI). This also includes displaying alert lists and statistical graphs.

[0106] Alarm and notification processing: Based on the determined urgency and settings, the alarm unit in the monitoring center is activated, and pre-registered personnel (field workers, managers, owners, etc.) are automatically notified of abnormality occurrence information by means of email, SMS (short message service), telephone (including automated voice notification), push notification to a dedicated mobile application, etc. The content of the notification may be customizable depending on the type of abnormality and the recipient.

[0107] Response workflow management processing: The system manages standard response procedures (workflow) for abnormality occurrences and supports the response by monitors (status check, instruction input, report creation, etc.). It also records and manages the history of who took what action and when.

[0108] External system integration processing: Based on the set conditions and the actions of the monitor, the system performs integration processing with external systems, such as sending dispatch request data to the security company, automatically reporting to the police and fire department (in the case of a serious incident that meets the specified conditions), and sharing information with the power company.

[0109] <(3) Examples of types of response processing> Specific examples of "predetermined response processes" that the monitoring system executes include the following. These processes may be executed automatically, or may be executed through the judgment and operation of a monitor, or a combination of these.

[0110] Immediate alerts to security personnel: warnings are displayed on the security system screen, and alarm sounds and lights are used to notify security personnel.

[0111] Automatic notification to relevant parties: Notify pre-registered relevant parties, such as the power plant owner, operations manager, and maintenance personnel, of any abnormalities via email, SMS, phone call, app notification, etc.

[0112] Requesting a security company to respond: Depending on the nature, location, time of day, etc. of the abnormality, instructions can be sent automatically or manually to request security guards to check the scene and rush to the scene.

[0113] - Reporting to public authorities: If it is determined that there is a high possibility of criminal activity or a serious accident, such as when a dummy conductor is broken or simultaneous abnormalities occur in multiple locations, a report will be made to the police or fire department (automatically or based on the judgment of a monitor).

[0114] Event log recording and management: A series of information, such as when and which detection device anomaly occurred, and who responded, when, and how, is accurately recorded in chronological order, and saved and managed for later verification and report creation.

[0115] Report generation: Automatically generate reports on anomalies and response status on a regular basis (daily, weekly, monthly) or on demand.

[0116] Remote operation instructions (if possible): When an abnormality occurs, in order to prevent damage from spreading and ensure safety, instructions can be given to remotely shut down related power equipment (e.g. PCS, circuit breakers) and to pan, tilt, and zoom surveillance cameras.

[0117] Trend analysis and preventive maintenance information provision: Analyzes accumulated abnormality data to identify whether there is a tendency for abnormalities to occur frequently in specific locations or equipment, and provides information that is useful for planning preventive inspections and maintenance.

[0118] The specific implementation form of a monitoring system varies depending on the scale of the target power system, the required security level, and the operational system. For example, a small-scale system could be configured to monitor using a single PC, while a large-scale system could be configured as a distributed processing system using multiple servers or using a highly reliable cloud service. Standard IP-based protocols (TCP / IP, HTTP, MQTT, etc.) or industrial protocols can be used as communication protocols.

[0119] [5. Modifications] The present invention is not limited to the first and second embodiments described above, and various modifications and applications are possible within the scope of the technical concept thereof.

[0120] For example, the specific sensor types (voltage sensors, current sensors (current transformers, shunt resistors, Hall elements, etc.), optical sensors, etc.) in the detection units 11 and 11A, the configuration of the logic unit (relay sequence, programmable logic controller (PLC), microcontroller and software, dedicated IC, FPGA, etc.), and the abnormality determination logic (simple threshold determination, combined voltage / current determination, time change rate determination, pattern recognition by comparison with normal patterns, application of machine learning, etc.) can be selected and changed as appropriate depending on the required detection accuracy, cost, installation environment, etc.

[0121] The specific devices for alarm output in the alarm unit 2 (rotating lights, LED flashlights, sirens, buzzers, voice synthesizers, display panels, various signal output interfaces to linked systems, etc.), communication means for remote notification (mobile phone networks such as LTE and 5G, LPWA (Sigfox, LoRaWAN, etc.), Wi-Fi (registered trademark), specific low-power radio, wired LAN (Ethernet (registered trademark)), optical fiber, serial communication such as RS-485, etc.), and communication protocols can also be selected from a variety of options to suit the needs.

[0122] The specific delay time for the delay function (within the range of 5 to 90 seconds) can be adjusted according to the characteristics of the installation location. The voltage (other than 24V DC is also possible), current, frequency (in the case of AC superposition), and modulation method of the monitoring signal in the superimposed monitoring circuit method can also be changed according to the application and noise environment. The capacity and type of UPS are also selected according to the required backup time.

[0123] The material, shape, size, color, installation method (underground burial, overhead wiring, inside pipes, etc.), and disconnection detection method (continuity monitoring, optical fiber disconnection detection, capacitance change detection, etc.) of the dummy conductor can take a variety of forms depending on the local conditions and costs.

[0124] The judgment threshold for monitoring multiple locations (two or more locations, three or more locations, etc.), the method of information exchange between monitoring locations (wired signals, wireless communication, via LAN, etc.), and alarm level grading can all be designed according to the system scale and required specifications.

[0125] In a sensor-separated configuration, the signal transmission method (analog, digital, optical transmission, etc.) between the sensor unit and the logic unit can also be selected.

[0126] Furthermore, the features described in the first and second embodiments can be combined in any way as long as there is no technical contradiction.

[0127] For example, the main circuit power monitoring system of the first embodiment can be combined with a UPS to continue monitoring during a power outage, or the superimposed monitoring circuit system of the second embodiment can be combined with a dummy conductor to provide a dual, immediate alarm function. A separate sensor configuration can also be applied to the superimposed monitoring circuit system. The multi-point monitoring logic can be configured to integrate signals from both the main circuit power monitoring and the superimposed monitoring. These combinations can create a conductor abnormality detection system that is more optimized for specific installation environments and security requirements. In particular, combining main circuit power monitoring (with a delay function) with superimposed monitoring (with an immediate alarm) can address both power abnormalities during normal operation and conductor disconnections during no-voltage conditions, while balancing false alarm suppression and immediacy. Furthermore, combining a dummy conductor with multi-point monitoring can reduce false alarms and enhance the ability to respond quickly and reliably to fraudulent activity.

[0128] The present invention can also be configured as follows.

[0129] (1) a detector configured to monitor the condition of a conductor of the power system and detect a predetermined anomaly; an alarm unit configured to issue an alarm based on the detection of the abnormality by the detection unit. (2) The detection unit is configured to monitor a state of the main circuit power supplied to the conductor and detect the predetermined abnormality of the main circuit power. The conductor abnormality detection device according to (1) above. (3) The detection unit a monitoring signal supply unit that supplies a monitoring signal to the conductor from a monitoring power supply separate from the main circuit power; a supervisory signal detector that detects the predetermined abnormality of the conductor based on a transmission state of the supervisory signal through the conductor, The conductor abnormality detection device according to (1) or (2) above. (4) The alarm unit is configured to issue the alarm when the abnormality continues even after a predetermined time has elapsed since the detection unit detected the abnormality in the main circuit power. The conductor abnormality detection device according to (2) above. (5) The predetermined time is 5 seconds or more and 90 seconds or less. The conductor abnormality detection device according to (4) above. (6) The predetermined abnormality of the main circuit power is a loss of supply of the main circuit power or a voltage drop below a predetermined threshold. The conductor abnormality detection device according to any one of (2), (4) and (5) above. (7) the supervisory signal supply unit is configured to supply a DC supervisory signal; the supervisory signal detection unit is configured to detect an abnormality in the conductor based on a continuity state of the DC supervisory signal. The conductor abnormality detection device according to (3) above. (8) The monitoring power supply includes an uninterruptible power supply. The conductor abnormality detection device according to (3) or (7) above. (9) the alarm unit is configured to issue the alarm without waiting for a predetermined time to elapse when the monitoring signal detection unit detects an abnormality in the conductor. The conductor abnormality detection device according to any one of (3), (7) and (8) above. (10) The alarm unit is configured to output at least one of a visible light, an audible sound, and an operation instruction signal to an external device as the alarm. The conductor abnormality detection device according to any one of (1) to (9). (11) The alarm unit is configured to transmit a notification signal to a remote monitoring system when the alarm is issued. The conductor abnormality detection device according to any one of (1) to (10) above. (12) The conductor abnormality detection device further comprises: a dummy conductor provided separately from the conductor and capable of detecting a break; a signal path for causing the alarm unit to issue an alarm without waiting for the predetermined time to elapse when disconnection of the dummy conductor is detected. The conductor abnormality detection device according to (4) or (5) above. (13) The dummy conductor has a size, color, or material similar to that of the conductor. The conductor abnormality detection device according to (12) above. (14) The detection unit includes a sensor unit disposed near the conductor and a logic unit housed in a separate housing connected to the sensor unit via a signal line. The conductor abnormality detection device according to any one of (1) to (13) above. (15) the detection unit is configured to monitor a state of the conductor at a plurality of monitoring points; The alarm unit is configured to issue the alarm only when the abnormality is detected in at least two of the plurality of monitoring locations. The conductor abnormality detection device according to any one of (1) to (14). (16) a detection step of monitoring the condition of the conductors of the power system; an alarm step of issuing an alarm based on the detection of a predetermined abnormality in the detection step. (17) the warning step issues the warning if the abnormality continues even after a predetermined time has elapsed since the abnormality was detected in the detection step; The conductor abnormality detection method according to (16) above. (18) the detecting step includes a step of supplying a monitoring signal to the conductor from a monitoring power supply separate from the main circuit power, and detecting an abnormality in the conductor based on a transmission state of the monitoring signal through the conductor; the warning step issues the warning without waiting for a predetermined time to elapse when an abnormality in the conductor is detected. The conductor abnormality detection method according to (16) or (17) above. (19) The conductor abnormality detection method further includes: a dummy detection step of detecting disconnection of a dummy conductor provided separately from the conductor; and when a break in the dummy conductor is detected in the dummy detection step, issuing an alarm in the alarm step without waiting for the predetermined time to elapse. The conductor abnormality detection method according to (17) above. (20) a conductor abnormality detection device including: a detection unit configured to monitor the state of a conductor of a power system and detect a predetermined abnormality; and an alarm unit configured to issue an alarm based on the detection of the abnormality by the detection unit and to transmit a notification signal to a remote monitoring system; the monitoring system configured to receive the notification signal from the conductor abnormality detection device and execute a predetermined response process. [Explanation of symbols]

[0130] 11, 11A Detector 12. Transformers 13 Logic unit (power off delay timer) 14 Monitoring signal supply section 15. Monitoring signal detector 2 Alarm section 21 Alarm panel 22 Rotating Light 3 Power conditioner (PCS) 31 Solar cell module 32 Junction box 33 Switch 81 Power conditioner main wiring 82 AC main wiring 85, 86 DC wiring 89 Dummy conductor 91 Detection wiring 100, 100A Conductor Abnormality Detector 141 AC / DC converter 142 Uninterruptible power supply (UPS) S101 Detection step S102 Abnormality determination step S103 Delay timer start step S104: Abnormality continuation determination step S105 Alarm step S201 Dummy detection step S301 Step

Claims

1. a detector configured to monitor the condition of a conductor of the power system and detect a predetermined anomaly; an alarm unit configured to issue an alarm based on the detection of the abnormality by the detection unit.

2. The detection unit is configured to monitor a state of the main circuit power supplied to the conductor and detect the predetermined abnormality of the main circuit power. The conductor abnormality detection device according to claim 1 .

3. The detection unit a monitoring signal supply unit that supplies a monitoring signal to the conductor from a monitoring power supply separate from the main circuit power; a supervisory signal detector that detects the predetermined abnormality of the conductor based on a transmission state of the supervisory signal through the conductor, The conductor abnormality detection device according to claim 1 .

4. The alarm unit is configured to issue the alarm when the abnormality continues even after a predetermined time has elapsed since the detection unit detected the abnormality in the main circuit power. The conductor abnormality detection device according to claim 2 .

5. The predetermined time is 5 seconds or more and 90 seconds or less. The conductor abnormality detection device according to claim 4.

6. The predetermined abnormality of the main circuit power is a loss of supply of the main circuit power or a voltage drop below a predetermined threshold.

6. The conductor abnormality detection device according to claim 2, 4 or 5.

7. the supervisory signal supply unit is configured to supply a DC supervisory signal; the supervisory signal detection unit is configured to detect an abnormality in the conductor based on a continuity state of the DC supervisory signal. The conductor abnormality detection device according to claim 3.

8. The monitoring power supply includes an uninterruptible power supply.

8. The conductor abnormality detection device according to claim 3 or 7.

9. the alarm unit is configured to issue the alarm without waiting for a predetermined time to elapse when the monitoring signal detection unit detects an abnormality in the conductor.

8. The conductor abnormality detection device according to claim 3 or 7.

10. The alarm unit is configured to output at least one of a visible light, an audible sound, and an operation instruction signal to an external device as the alarm. The conductor abnormality detection device according to claim 1 .

11. The alarm unit is configured to transmit a notification signal to a remote monitoring system when the alarm is issued. The conductor abnormality detection device according to claim 1 .

12. The conductor abnormality detection device further comprises: a dummy conductor provided separately from the conductor and capable of detecting a break; a signal path for causing the alarm unit to issue an alarm without waiting for the predetermined time to elapse when disconnection of the dummy conductor is detected.

6. The conductor abnormality detection device according to claim 4 or 5.

13. The dummy conductor has a size, color, or material similar to that of the conductor. The conductor abnormality detection device according to claim 12.

14. The detection unit includes a sensor unit disposed near the conductor and a logic unit housed in a separate housing connected to the sensor unit via a signal line. The conductor abnormality detection device according to claim 1 .

15. the detection unit is configured to monitor a state of the conductor at a plurality of monitoring points; The alarm unit is configured to issue the alarm only when the abnormality is detected in at least two of the plurality of monitoring locations. The conductor abnormality detection device according to claim 1 .

16. a detection step of monitoring the condition of the conductors of the power system; an alarm step of issuing an alarm based on the detection of a predetermined abnormality in the detection step.

17. the warning step issues the warning if the abnormality continues even after a predetermined time has elapsed since the abnormality was detected in the detection step; The conductor anomaly detection method according to claim 16.

18. the detecting step includes a step of supplying a monitoring signal to the conductor from a monitoring power supply separate from the main circuit power, and detecting an abnormality in the conductor based on a transmission state of the monitoring signal through the conductor; the warning step issues the warning without waiting for a predetermined time to elapse when an abnormality in the conductor is detected. The conductor anomaly detection method according to claim 16.

19. The conductor abnormality detection method further includes: a dummy detection step of detecting disconnection of a dummy conductor provided separately from the conductor; and when a break in the dummy conductor is detected in the dummy detection step, issuing an alarm in the alarm step without waiting for the predetermined time to elapse. The conductor anomaly detection method according to claim 17.

20. a conductor abnormality detection device including: a detection unit configured to monitor the state of a conductor of a power system and detect a predetermined abnormality; and an alarm unit configured to issue an alarm based on the detection of the abnormality by the detection unit and to transmit a notification signal to a remote monitoring system; the monitoring system configured to receive the notification signal from the conductor abnormality detection device and execute a predetermined response process.

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