JPH01150871A - Structure of system for detecting accident point in transmission line - Google Patents

Abstract

PURPOSE:To execute a synchronized current detecting operation for generating no shift of a transmission line current detection time in each local station by providing an accident detecting device, a synchronizing signal generating circuit, an accident current information storage, etc. CONSTITUTION:An accident detecting device 20 of a local station (LS) receives a current detecting signal from a sensor, and detects whether an accident has been generated in a transmission line or not. A synchronizing signal generating circuit 21 generates a synchronizing signal by using a detecting signal from the device 20 as a trigger signal, applies it to an accident current information storage device 22, and also, sends it out onto a channel CH2 and transfers it to a synchronizing signal generating circuit of an adjacent LS, as well. The device 22 is activated in response to the synchronizing signal from the circuit 21 and stores current information from the sensor. A data transmission device 23 adds accident current information which has been detected by its own station, to accident current information from other LS, and gives it to the adjacent LS. In such a way, an accident section detecting system can be constituted exactly by using the information which has been detected synchronously.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a method for easily and reliably detecting the fault point when an accident such as a ground fault or short circuit occurs on a power transmission line for supplying electric power. Regarding the structure of possible transmission line fault point detection system.

[Prior Art] FIG. 3 is a diagram showing a schematic configuration of a conventional device for locating fault points on power transmission lines.

In FIG. 3, a section between two predetermined points A and B on the power transmission line 1 is monitored by one fault section detection device.

At point A, there are a current detector 2a for detecting the current flowing through the power transmission line 1, a phase detector 3a for detecting the phase of the current signal from the current detector 2a, and a phase detector 3a for detecting the phase of the current signal from the current detector 2a. A current value detector 4a for detecting the magnitude is provided.

At point B, there are a current detector 2b for detecting the current flowing through the power transmission line 1, a phase detector 3b for detecting the phase of the current signal from the current detector 2b, and a current detector 3b for detecting the phase of the current signal from the current detector 2b. A current value detector 4b for detecting the magnitude is provided.

The current detectors 2a and 2b are configured using, for example, an optical magnetic field sensor or an optical current transformer (optical CT). This magnetic field sensor detects a magnetic field induced by a current flowing through the power transmission line 1, and derives an optical signal having an intensity corresponding to the detected magnetic field intensity. Therefore, this optical signal has a phase and magnitude corresponding to the phase and magnitude of the current flowing through the power transmission line 1. Usually, the current detectors 2a, 2b are provided for the overhead ground wire of the power transmission line. Further, depending on the form of the power transmission line, it may be directly attached to the power line.

In order to detect whether an accident has occurred in the section A-B, a phase comparator 5 receives phase detection information from the phase detectors 3a and 3b and compares the detected phases; a current value detector 4a;
A current value comparator 6 receives the current value information from 4b and compares the magnitude of the detected current value, and a central monitoring station ( A transmission terminal 7 for sending data to a terminal (not shown) is provided. Phase detector 3a, 3bS current detector 4a, 4bs comparators 5, 6 and transmission terminal 7 constitute one local station LS.

The phase comparator 5 determines that the currents at points A and B are in phase when the phase difference of the given detected phase information is within a predetermined phase range (for example, 90 degrees); otherwise, the phase comparator 5 determines that the currents at points A and B are in phase. It is determined that an accident has occurred.

The current value comparator 6 receives detected current value information from points A and B, and determines that a current value difference exists if the current value difference is a predetermined value or more. Next, before explaining the operation, the principle of locating the accident zone will be explained.

When an accident such as a ground fault occurs in the power transmission line 1, a large fault current flows through the power transmission line 1. At this time, if a ground fault occurs within section A-B, the phases of the fault currents at points A and B will be reversed, and if a ground fault occurs outside section A-B, points A and B The phases of the fault currents at are in phase.

On the other hand, when a phase-to-phase short circuit occurs in the power transmission line 1, the magnitude of the current value is compared because there is no phase difference in the fault current in a power transmission line with one end grounded system. . Normally, the current detectors 2a and 2b are provided for the overhead ground wire, but the fault current flowing through such an overhead ground wire decreases as it moves away from the fault point. Therefore, by detecting the magnitude of this fault current and comparing the magnitude, the fault current will be larger at the detection point closer to the fault point, and the fault current value difference will be larger, so the fault section can be located. . Next, the operation of the conventional accident area locating device shown in FIG. 3 will be explained.

Normally, the current detectors 2a, 2b monitor the current flowing through the ground wire (overhead ground wire), and derive a signal corresponding to the current flowing through the other wire, and output the signal to the phase detectors 2a, 2b and the current value detector. Give to 4a and 4b.

The phase comparator 5 receives the phase detection signals from the phase detectors 3a and 3b, compares their phases, and detects a phase difference. If the phase difference is greater than or equal to a predetermined value, a signal is derived indicating that a phase difference exists, that is, for example, that a ground fault has occurred within section A-B. The current value comparator 6 is a current value detector 4a.

The current value information from 4b is compared, and if the current value difference is greater than a predetermined value, a signal indicating that a current value difference exists, that is, an accident occurrence signal is derived. The signal derived from comparator 5.6 is applied to transmission terminal 7. The transmission terminal 7 sends given phase and phase difference information, as well as current and current value difference information, to a central monitoring station at predetermined intervals.

The central monitoring station reorients the accident section based on the current value, current value difference information, and phase 1 phase difference information from local stations set up for each section.

Here, since the information sent from the local stations provided for each section must be the same information at the same time after the accident, the clock signal that provides the information sending timing of the transmission terminal 7 is synchronized at all local stations. is taken. Of course, phase detector 3
Since the timings at which the current value detectors a, 3b and the current value detectors 4a, 4b detect must also be at the same time, the detection times are synchronized.

FIG. 4 is a diagram showing an example of a system configuration in which a system for monitoring the entire power transmission line is configured using the power transmission line accident section locating device shown in FIG. 3. As shown in FIG. 4, the outputs of the current detectors 2a to 2g are monitored by the local station LSI, and the outputs of the current detectors 2h to 2n are monitored by the local station LS2. Local stations LSI and LS2 are provided with power supplies 18a and 18b, respectively, which are made of solar cells, for example. Current detectors 2a, 2b, 2f, 2g, 2h, 2i.

2m, 2n and current detectors 2c, 2d, 2e, 2j.

2, the wavelength of the optical signal that carries the detection signal is different from ':l. This makes it possible to wavelength-multiplex multiple sensor outputs and monitor them at one local station. Current detector 2a.

2b output is multiplexed by multiplexer 30a,
The output and the current detector 2C output are transmitted to the local station LSI by the multiplexer 30b.

The outputs of the current detectors 2g and 2f are multiplexed by a multiplexer 30d, wavelength-multiplexed, and transmitted. The outputs of the current detector 2e and the multiplexer 30d are multiplexed (wavelength multiplexed) by the multiplexer 30c and transmitted to the local station LSI. The output of the multiplexer 30b is applied to the demultiplexers 31b and 31a, where they are demultiplexed into their respective original optical signals and applied to the accident determination section 10a. The output of the multiplexer 30c is applied to the demultiplexers 31e and 31d of the local station LS1, and after being demultiplexed, the output is applied to the accident determination section 10a. Accident determination section 1
0a detects phase difference information and current value difference information for each of the outputs of the current detectors and the output of the current detector 2d branched by the branchers 31a to 31d. That is, the accident determination unit 10a detects the phase difference and current value difference between each section using the outputs of adjacent current detectors. Each piece of detection information detected by the accident determination unit 10a is given to the transmission terminal 7a, and after being converted into a predetermined signal format from the transmission terminal 7a, it is sent to the transmission terminal 7b of the local station LS2.
sent to.

On the other hand, the outputs of the current detectors 2h and 2i are multiplexed by a multiplexer 30e. The output of the multiplexer 30e and the output of the current detector 2j are combined by the multiplexer 30f and sent to the local station LS.
2. Current detector 2m, 2n output is multiplexer 3
The signals are combined by 0h. The multiplexer 30h output and the current detector 2 bypass output are multiplexed by a multiplexer 30g. Multiplexer 30
g output is sent to local station LS2. The output of the multiplexer 30f is demultiplexed by the demultiplexers 31e and 31f, and decomposed into signals corresponding to the outputs of the current detectors 2h and 2j, respectively. Multiplexer 30g output is splitter 31g, 31h
The signal is demultiplexed and decomposed into the respective current detector outputs. The data detection accident determination unit 10b includes branching filters 31e to 3.
1h output and the output to the current detector 2, and detects phase difference information and current value difference information of each current. The transmission terminal 7b converts the information transmitted from the transmission terminal 7a and the information detected by the accident determination section 10b into a predetermined signal format, and transmits the signal to the central monitoring station at a predetermined timing.

The central monitoring station receives the outputs of each of the current detectors 2a to 2n transmitted from the communication transmission terminal 7b, decomposes the output into each current detector information, and then detects the distribution of phase difference and current value over the entire power transmission line. do. This central monitoring station simulates and stores in advance the phase difference distribution and current value difference distribution at the time of occurrence of an accident over the entire power transmission line, and locates the accident section based on the simulation results.

As described above, the conventional fault area locating system uses current detection sensors (optical CT, etc.) at multiple predetermined points on the power transmission line.
is installed and detects the fault current that flows when an accident such as a ground fault or short circuit occurs, and the detected fault current information is compared with the information from the sensor directly or adjacently at the local station LS installed in the middle of the power transmission line. After undergoing temporary processing such as The system is configured to determine the section or point where an accident occurs.

[Problems to be Solved by the Invention] In the conventional power transmission line fault area locating system, information from sensors (transmission line current detectors) installed so as to be appropriately distributed over the entire power transmission line is sequentially transferred to a central location. A so-called cyclic digital data transmission method is used to transmit data to the monitoring station MS.

This cyclic data transmission method is a method in which the information of each local station is cyclically transmitted from a remote location to a central monitoring station every 1 to 10 seconds, and during one cycle, the information position of each local station is transmitted to the central monitoring station. Each local station writes its own current value detector output at a predetermined position in a designated information frame, and transmits it to the central monitoring station. Therefore, a time lag inevitably occurs in the timing of data transmission between local stations located further away from the central monitoring station and local stations located closer to the central monitoring station. Therefore, even though fault current information for the entire power transmission line at the same time is required when an accident occurs, there is a problem in that each local station provides time-shifted transmission line current information to the central monitoring station. Ta. In other words, in order to cause each local station to operate synchronously, a configuration may be adopted in which a high-speed clock signal is applied to each local station to cause each local station to operate synchronously, but in this case, a high-speed clock signal is transmitted. In order to avoid this, a relatively low-speed clock signal is used, and when each local station is accessed without using a clock signal, transmission line fault current information is transmitted centrally. Since the current information is provided to multiple monitoring stations, it was inevitable that there would be a time lag in the current information detection time at each local station.

It is also possible to consider a system in which the current detector information is transmitted in its original waveform without any temporary processing such as comparison, but in this case, after sampling the original waveform with a high-speed clock signal, Since a high-speed transmission device is required to transmit the signal to the central monitoring station, there is no difference in the transmission line current detection time at each local station, but in this case, the transmission line current information must be transmitted at high speed. As a result, the transmission equipment becomes larger and the transmission capacity is limited due to power supply constraints (2Mbps is 3Mbps).
(approximately 0 channels), it cannot be applied to a power transmission line system in which a large number of current detectors are provided, such as a long power transmission line.

In other words, in this configuration, some kind of transmission terminal (a terminal capable of high-speed transfer operation) is required at the current detector installation point, which increases the device configuration and requires such a transmission terminal at each current detector installation point. A problem arises in that it is quite difficult to provide a power supply with sufficient capacity for operation.

Therefore, it is an object of the present invention to eliminate the drawbacks of the conventional transmission line fault area locating system as described above, and to provide a synchronized transmission line current detection time at each local station that does not deviate with a simple configuration. An object of the present invention is to provide a fault point detection system that enables current detection operation.

[Means for Solving the Problems] The power transmission line fault point detection system structure according to the present invention detects fault sections and/or points based on the outputs of power transmission line current detectors distributed in a power transmission line system. In the location system, each local station is provided with a means for detecting the occurrence of an accident based on power transmission line current information, and an activation signal (synchronization signal) in response to an accident occurrence detection signal from this accident occurrence detection means. and means for latching the power transmission line current detector output to this activation signal. This activation signal generating means can also send and receive the activation signal to other adjacent local stations, and similarly activates the latch means when an activation signal is given from another local station. do.

[Operation] In this configuration, since the accident occurrence detection signal is transferred to each local station at high speed as a synchronization signal, each local station transmits the activation signal in synchronization with the activation signal generated in response to this accident detection signal. It is now possible to detect the power line current, which enables synchronized power line current detection operations at each local station, and it is possible to derive accurate current value information over the entire power transmission line, which allows accurate fault area and accident detection. It becomes possible to orient the point.

In addition, each local station can only transfer data in the event of an accident on the power transmission line, and there is no need to transfer data at high speed, so the power supply capacity can be small. Even in locations such as mountainous areas where it is difficult to install a suitable power source, it is possible to detect power transmission line current in synchronization with the load.

[Embodiment] FIG. 1 is a diagram showing the basic configuration of a local station used to configure a power transmission line fault point detection system structure according to an embodiment of the present invention.

In FIG. 1, a local station LS, which is a basic structural unit, receives a current detection signal from a sensor (not shown) installed at a predetermined point on a power transmission line to detect the current flowing through the power transmission line. An accident detection device 20 for detecting whether or not an accident has occurred on a power transmission line; a synchronization signal generation circuit 21 for generating a synchronization signal in response to an accident detection signal from the accident detection device 20; and a synchronization signal generation circuit. a fault current information storage device 22 that is activated in response to a synchronization signal from the circuit 21 and captures and stores current information from the sensor;
A data transfer device 2 reads the fault current information stored in the fault current storage device 22, converts it into a predetermined signal format, and sends it to an adjacent local station or central monitoring station.
3.

If an accident occurs on the transmission line, the current level flowing there will be different from normal, so the current information from the transmission line current detector (hereinafter simply referred to as sensor) will be different from normal. It turns out. Normally, when an accident occurs, the current level from the sensor is often higher than normal (depending on the nature of the accident, the transmission line current level may be lower than normal), and this current level change is detected by the accident detection device. 20 detects and can be easily configured, for example, by using a comparator that compares each sensor output with a reference current value and an OR gate that takes the logical sum of each comparator output.

The synchronization signal generation circuit 21 generates a synchronization signal using the accident detection signal from the accident detection device 20 as a trigger signal, provides the synchronization signal to the accident current information storage device 22, and sends it onto the channel CH2 to transmit the synchronization signal to the adjacent local station. It is also transmitted to the synchronization signal generation circuit. Therefore, the synchronization signal generation circuit 21 generates a synchronization signal in response to a detection signal from the accident detection device 20, and also when a synchronization signal is provided from an adjacent local station.
The synchronization signal will be given to the fault current information storage device 22. Therefore, the synchronization signal generation circuit 21 generates a synchronization signal using either the detection signal from the accident detection device 20 or the synchronization signal from any local station as a trigger signal.

The fault current information storage device 22 is activated in response to a synchronization signal from the synchronization signal generation circuit 21, and captures and stores current information from the sensor. As the current information to be stored, the power transmission line current value and the power transmission line current phase from the sensor are stored. The configuration of such a fault current information storage device is to constantly monitor current information from the sensor, sample and hold the current value and phase,
It is conceivable to adopt a configuration in which when a synchronization signal is applied, the sampled and held current value and phase value are stored. At this time, the current value detection and storage device may be configured to detect the maximum value of the current in a predetermined period of time, such as a sample-and-hold circuit. A counter that is reset can be used and its count value can be used as phase information.

The data transmission device 23 receives fault current information from an adjacent local station or other local stations provided via channel CHI, adds fault current information detected at its own station to the fault current information, and to the local station. As a result, fault current information detected by each local station will be sent to the central monitoring station.

In the above configuration, the channel CHI for transmitting and receiving current information performs data transmission in the -force direction, and the channel CH2 for transmitting synchronization signals performs bidirectional data communication.

A high-speed optical signal can be used to send the synchronizing signal from the synchronizing signal generation path 21 to other adjacent local stations at high speed.

Normally, when an accident occurs on a power transmission line and the occurrence of the accident is detected at one of the local stations, the information required by the central monitoring station is the information detected by all sensors at the time of the accident. However, depending on the nature of the accident, local stations other than the one that detected the accident may not be able to detect the occurrence of the accident, and may therefore send out information that is not at the time of the accident, making it difficult to accurately identify the accident section. Orientation may not be possible in some cases. However, when an accident is detected at one local station, a synchronization signal is generated using the accident detection signal as a trigger signal, and this synchronization signal is transmitted at high speed to all local stations. By configuring the system to capture and store sensor information using a signal as a trigger signal and transmit it to a central monitoring station, it is possible to obtain transmission line current information at the same time, making it possible to accurately detect fault points. It becomes possible.

Next, the general operation will be explained. At all times,
There is no change in the current level flowing through the power transmission line, and no detection signal is generated from the fault detection device 20. On the other hand, the fault current information storage device 22 constantly monitors information from each sensor, and samples and holds the current value information and phase information at that time.

The data transmission device 23 receives information given from an adjacent local station at predetermined time intervals, adds the constant fault current information detected by its own station to the received information, and transmits it to the other local station. do.

If an accident occurs on a power transmission line, the level of current flowing through the transmission line will be different from normal. This current level different from normal is detected by the accident detection device 20, thereby detecting that an accident has occurred in the power transmission line. 1
When an accident is detected at one local station, the synchronization signal generation circuit 21 included in the local station that detected the accident generates a synchronization signal and supplies it to the fault current information storage device 22 of the local station, and also Also send to. The fault current information storage device 22 whose synchronization signal has been stopped takes in the sensor information at that time and stores the transmission line current information and phase information. Data transmission device 2
When access is made to transmit data at a predetermined timing, the fault current information stored in the storage device 22 is read out, converted into a predetermined signal format, and transmitted to an adjacent local station. As a result, fault current information detected at each local station is provided to the central monitoring station. The central monitoring station analyzes fault current information across the entire power transmission line provided by each local station and locates the fault point on the power transmission line.

At this time, at the central monitoring station, the current value distribution pattern and phase distribution pattern for each power transmission line are calculated and stored in advance in accordance with the accident type, and the patterns based on the stored simulation and results are used. The accident point is located based on the

Therefore, as is clear from the above explanation of the operation, accident detection information is transmitted to each local station at high speed, and each local station thereby detects transmission line current information at the same time.

Memorize and, on the other hand, data transmission regarding the transmission line current,
It is not necessary to perform the process at a particularly high speed; a low speed is sufficient, and the process is performed at the same timing as usual. Therefore, although there is a time lag in the timing at which each local station transmits data, the current value information detected and stored by each local station is the value at the same time, and the same time is required for locating the accident area. Transmission line current information can be obtained.

As in the above configuration, if the sensor signal is first processed at each local station (that is, detecting its current value information and phase information) and then the final judgment is made at the central monitoring station, each local station The amount of data to be transmitted can be extremely reduced, and many current detectors (sensors) monitored by one local station can be installed without increasing the power supply capacity, making it possible to use a large number of transmission lines with many towers. It is possible to install a large number of current detectors even in the case of a large number of current detectors, and it is possible to send the transmission line current at the same time to a central monitoring station with a simple device configuration, and it can also be applied to a long power transmission line system. Can be done.

In addition, since the amount of data to be transmitted is transmitted after primary processing, the amount of data to be transmitted is compressed, and the communication device that transmits the data multiplexes and transmits the data, but the device configuration becomes larger. Therefore, the local station can be configured without significantly increasing the amount of current consumption, and the local station can be operated using a relatively small capacity power supply. Furthermore, since it is possible to detect changes across all power transmission lines (for example, power outages), it is also possible to understand the status of each power transmission line system.

FIG. 2 is a diagram showing an example of a system configuration when a power transmission line fault detection system is configured using the local stations shown in FIG. 1.

As shown in FIG. 2, a plurality of current detectors (sensors) Sl, S2 . S3
．． S4 generates an electrical signal corresponding to the current flowing through the power transmission line. Each of the sensors S1 to S4 is provided with an electric-optical converter E1 to E4, which is made of a light emitting diode (LED), respectively, and the current signal detected by each sensor S1 to S4 is converted into an optical signal. The optical signals from each sensor via the electro-optical converters are subjected to processing such as multiplexing (wavelength multiplexing) by multiplexers/demultiplexers B1 and B2, and are transmitted to the corresponding local station LS.

The local station LS sends the multiplexed optical signals from the sensors S1 to S4 through multiplexers and demultiplexers B4 and B7 (the path of the sensor output received by the multiplexer and demultiplexer B7 is omitted here). I will receive it. Each sensor output is sent to a multiplexer/demultiplexer B5.
B6. B8 and the optical-to-electrical converters P1 to P7 which convert optical signals into electrical signals, for example, photodiodes. (corresponding to the fault current information storage device 22).

Block 30 monitors each sensor output, activates synchronization signal generation circuit 21 when an accident occurs, and provides stored current information to transmission terminal 23.

The synchronization signal generation circuit 21 transmits and receives synchronization signals to and from the local station on the left side of the figure via a shunt B1 consisting of a multiplexer/demultiplexer or a splitter. That is, an optical-to-electrical converter PIO is provided between the shunt Bll and the synchronizing signal generating circuit 21 to convert the optical signal from the shunt Bll into an electrical signal, and converting the electrical signal from the synchronizing signal generating circuit 21 into an electrical signal. An electro-optical converter E10 is provided, which includes an LED or the like, which converts it into an optical signal and supplies it to the shunt Bll. Similarly, in order to transmit and receive synchronization signals between the synchronization signal generation circuit 21 and the local station on the right side of the figure and the monitoring station in the center, an electric-to-optical converter is installed between the shunt B12 and the synchronization signal generation circuit 21. E11 and a photo-to-electrical converter pH are provided. The transmission terminal 23 receives transmission data by an optical-to-electrical converter P12 that receives transmission information from an adjacent local station via a channel CH and a multiplexer/demultiplexer BIO and converts it into an electrical signal, and the transmission terminal 23 transmits the data. The data information is converted into an optical signal by the electro-optic converter E12, and then provided to the multiplexer/demultiplexer 81B, and transmitted onto a channel CH made of, for example, an optical fiber.

In the above configuration, therefore, the channel for transmitting and receiving current information and the channel for transmitting and receiving synchronization signals are shared, and data transmission is performed by wavelength multiplexing the information.

A multicore optical fiber is used as the channel CH.

The central monitoring station MS has a channel CH made of optical fiber.
After receiving the current information from each local station via and converting it into an electrical signal by the optical-to-electrical converter P20,
A central processing unit 40 for analyzing the received current information and locating the accident section, and a keyboard as a peripheral device for inputting and outputting data to the central processing unit 40, that is, displaying the accident point and inputting necessary data. 42, printer 43
and a display (CRT) device 41.

In the above configuration, the data transmission performed by the transmission terminal 23 is in one direction (that is, the direction toward the central monitoring station MS).
On the other hand, the synchronization signal generation circuit 21 performs bidirectional data transmission and reception. The channel connection configuration is not limited to the illustrated configuration, and various other configurations may be used. In other words, when two-way data transmission is performed using a single-core optical fiber for input and output, respectively, dedicated to the path of the synchronization signal generation circuit, or as shown in Figure 1, A conceivable case is that an optical fiber is used and an optical branching device or an optical multiplexer/demultiplexer is used to share the transmission system and the reception system with one optical fiber.

With the above configuration, the synchronization signal generation circuit that receives the synchronization signal in the form of an optical signal from the synchronization signal generation circuit included in the adjacent local station further generates an optical signal to further transmit the synchronization signal to the adjacent local station. Notifies the station's synchronization signal generation circuit of the occurrence of an accident.

In this way, all local stations will detect the occurrence of a fault at high speed and in response detect the line current.

In addition, when configuring a transmission line fault point detection system, the transmission line is suspended from a steel tower (in the case of an overhead power transmission line), and a local station is installed on every few steel towers, with one local station for each sensor. becomes. In this case, even if a local station is installed on a steel tower, according to the present invention, a high-speed clock signal is not required, and the transmission line current information is transmitted after primary processing, so it has a large capacity. This system does not require a power source, and can use a small-capacity power source such as a solar cell, making it possible to adapt to a variety of power transmission line configurations.

[Effects of the Invention] As described above, according to the present invention, the occurrence of an accident is detected based on the sensor output in each local station that monitors the transmission line current, and the detected occurrence of the accident is used as a trigger signal to synchronize. A signal is generated and transmitted to each local station, and each local station stores current value information and phase information from the sensor output in response to the synchronization signal, and then sends it to the central monitoring station at a predetermined timing. Therefore, the transmission line current information given to the central monitoring station is the transmission line current information at the same time, and there is no need to use a high-speed synchronization clock signal. A relocal station can be configured using the data communication device, and an accurate accident area (point) detection system can be configured using the synchronously detected information.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the basic structure of a local station used in a power transmission line fault detection system structure according to an embodiment of the present invention. FIG. 2 is a diagram showing an example of a system configuration in a power transmission line fault point detection system structure that is an embodiment of the present invention. FIG. 3 is a diagram showing the basic configuration of a conventional power transmission line fault section locating system. FIG. 4 is a diagram showing an example of the configuration of a conventional power transmission line fault section locating system. In the figure, 1 is a power transmission line, 2.81 to S4 are power line current detectors (sensors), 20 is an accident detection device, 21 is a synchronization signal generation circuit, 22 is an accident current information storage device, 23 is a data transmission device, LS is a local station, MS is a central monitoring station, and CH, CHl, and CH2 are data transmission channels consisting of fibers. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (4)

[Claims] (1) Accident inspection for detecting fault points on the power transmission line based on output signals from sensor means provided at each of a plurality of predetermined points on the power transmission line and detecting the power transmission line current flowing through the point. an output system structure, the system structure comprising at least one local station receiving a plurality of sensor means outputs, the local station being responsive to the sensor means outputs to indicate that an accident has occurred on the power transmission line; accident detection means for detecting an accident detection means; activation signal generation means for generating an activation signal in response to an accident detection signal from the accident detection means; and predetermined processing on the output of the sensor means in response to the activation signal. A transmission line fault point detection system structure, comprising means for performing and storing. (2) The system structure includes a plurality of local stations, each of the plurality of local stations includes a transmitting/receiving means for transmitting and receiving the activation signal with an adjacent local station, and the activation signal generating means includes:
Claim 1: When receiving an activation signal generated by any of the plurality of local stations through its own transmitting/receiving means, the local station also generates an activation signal to activate the storage means. The power line fault detection system structure described. (3) Each of the local stations is equipped with a transmitting means for transmitting the information stored in the storage means of the local station to a central monitoring station, and the central monitoring station receives information from a plurality of local stations. A power transmission line fault point detection system structure according to claim 1 or 2, comprising means for detecting fault points based on sensor means output information. (4) The power transmission line fault point detection system structure according to any one of claims 1 to 3, wherein the activation signal is transferred between each local station in the form of an optical signal.