JPH0217469A - Apparatus for monitoring transmission line and monitoring system thereof - Google Patents

Abstract

PURPOSE:To enable the exact location of a faulty section even when a lag exists in an information transmission time from monitoring apparatuses, by receiving radio broadcasting and by correcting a time count operation of a time count device on the basis of a time information contained therein. CONSTITUTION:When reaching a time (e.g. 59min of every hour) to receive a time information (of NHK broadcasting) according to a time count operation in its own, a clock function circuit 22 gives a signal to turn a receiving device 20 ON and makes it receive the NHK broadcasting until it receives the time information. The device 20 gives a received information to a time information extracting circuit 21. Extracting the time information, the circuit 21 gives it to the circuit 22. Based on the given time information, the circuit 22 corrects (resets counter outputs indicating a minute and a second) its time count operation and a time information (a time information generated by counting 12 a clock signal from an oscillator 13 and responding to an output of a counter 12). In this way, it is possible to make exact the time information generated by the circuit 22 and to make synchronous the time informations led out by monitoring apparatues LS.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to the configuration of a device and system for monitoring the status of power supply lines such as power transmission lines, and in particular, to the configuration of a device and system for monitoring the status of power supply lines such as power transmission lines. 47. to compensate for time lag in current detection information. Regarding S formation.

[Conventional technology] Even though power supply lines such as power transmission lines have sufficient voltage resistance, accidents such as ground faults and phase-to-phase short circuits can occur, causing large currents to flow through the power transmission lines. Sometimes. Therefore, it is necessary to promptly detect whether or not such an accident has occurred and to locate the accident location in order to deal with the accident that has occurred. In order to monitor the state of power supply lines such as power transmission lines, a configuration as shown in FIG. 3 has conventionally been used.

Referring to FIG. 3, the conventional power transmission line monitoring system includes a sensor S that is provided at each of a plurality of predetermined points on a power transmission line 1, detects the current flowing through the power transmission line at the point, and a predetermined number of A sensor is provided for each sensor, receives transmission line current detection information from each sensor S, and after performing predetermined processing on the received current information,
Monitoring devices L S 1 to L S n that send processing information to the central monitoring station MS at predetermined timing, and each monitoring station L8
A central monitoring station installed at a substation, for example, receives processing information from 1 to LSn and monitors the status of the power transmission line 1, that is, detects whether an accident such as a ground fault has occurred on the power transmission line, and locates the accident point. It consists of MS.

Information transmission between each monitoring device and between each monitoring device and the central monitoring station MS is carried out by an information transmission line 2 consisting of a fiber optic connected to an overhead ground wire installed in the power transmission line.
It is done through.

Each sensor S includes an optical magnetic field sensor, an optical CT (current transformer), etc. that are installed near the power transmission line 1 and detect the magnetic field induced by the current flowing through the power transmission line 1, thereby deriving power transmission line current information. used.

Each of the monitoring devices LS1 to LSn has a configuration as shown in FIG. 4. That is, with reference to FIG. 4, the monitoring device LS is adjacent to a signal processing section 10 that receives current detection information from a corresponding sensor and performs predetermined processing, and processing information from the signal processing section 10. It includes a transmission terminal 11 that adds processing information from the devices and sends it out, and an oscillator 12 and a counter 13 that provide operation timings of the signal processing section 10 and the transmission terminal 11.

The oscillator 12 generates a clock signal of a predetermined frequency and provides it to the signal processing section 10 and the transmission terminal 11 as a basic clock signal.

Counter 13 receives a clock signal from oscillator 12,
An activation signal is generated every predetermined number of clocks and is applied to the signal processing section 10 and the transmission terminal 11, respectively.

In response to the synchronization signal from the counter 13, the signal processing unit 10 transmits processing information applied to the sensor output to the transmission terminal 11.
give to Various methods are used for processing by the signal processing section 10. For example, a method is used in which power transmission line current detection information is received from each sensor, and power transmission line current value and current phase information are detected for each sensor output. At this time, the phase information of the transmission line current information is derived based on the clock signal from the oscillator 12, and is
It is also possible to count the number of clock signals from the oscillator 12 when a synchronization signal is given from the oscillator 12, and use the counted value as phase information of the power transmission line current. Derivation of current value information is as follows:
This is done by sampling and holding the sensor output.

Also, a configuration is used in which sensor outputs provided at adjacent points are compared, it is determined whether or not the polarities of the two sensor outputs match, and the determination result is derived.

The transmission terminal 11 receives the processing information from the f5 processing unit 10 and starts a transmission operation in response to a synchronization signal from the counter 13. Therefore, the transmission terminal 11 transmits the current detection information in the monitoring device LS once at predetermined time intervals. Each monitoring device LS
The information is sent to the central monitoring station MS via a signal line (information transmission line) 2. At the central monitoring station MS, based on the transmission line current information sent from each monitoring device LS, the presence or absence of an accident on the power transmission line and the location of the occurrence point at the time of occurrence of the accident are determined.

In this central monitoring station MS, when an accident occurs, the current value or current polarity is different in the sensor outputs at both ends of the sensor that sandwich the accident occurrence point, and the point (or section) where the current value or current polarity changes is different. ) By finding out the 11th place of death (head and foot) is being performed.

[Problems to be Solved by the Invention] As described above, in the conventional power transmission line monitoring system, information processing timing and information transmission timing are provided by an oscillator and a counter independently provided in each monitoring device. The current information from each monitoring device is sent to the central monitoring station MS via an information transmission line 2 made of a single optical fiber, for example. Furthermore, each monitoring device is configured to transmit power line current information at predetermined time intervals. Therefore, central observation post M
Due to the difference in distance between the monitoring device (LSI) installed near S and the monitoring device (LSn) installed far away, there is a time difference in the time for current information to reach the central monitoring station MS. The central monitoring station MS
There was a problem in that the current information from each of the monitoring devices LS1 to LSn that arrived at the transmission line was not all sampled at the same time, and each monitoring device could only provide information that included information transmission time errors. . That is, for example, the power transmission line current information sampled at time t1 by the monitoring device LSn is added to the power transmission line current information sampled at time t2 by the monitoring device LSI and sent to the central monitoring station MS. The transmission line current information in the monitoring device LSn is older than the transmission line current information in the monitoring device LSI, and there is a problem that the transmission line current information at the same time may not be provided to the central monitoring station MS. Ta.

Normally, when an accident occurs on a power transmission line,
Is it necessary to use transmission line current information detected at the same time throughout each power transmission line to locate the accident section and detect whether or not an accident has occurred? In other words, as mentioned above, when locating a fault section, the phase distribution and current value distribution over the entire power transmission line are detected based on current information at the same time, and the fault section is located based on this. , if the transmission line current information at the same time is not given,
A problem arises in that it becomes impossible to accurately locate the accident section.

Therefore, the present invention eliminates the problems in the conventional power transmission line monitoring system as described above, and can accurately locate the accident section with a simple configuration even if there is a difference in the information transmission time from each monitoring device. An object of the present invention is to provide a power transmission line monitoring system and a monitoring device for the same.

[Means for Solving the Problems] A power transmission line monitoring device according to the present invention includes a timekeeping device that is provided correspondingly to the device, performs a timekeeping operation, and generates time information based on the timekeeping operation, and a timekeeping device that generates time information based on the timekeeping operation. A device for receiving wireless broadcasting, a device for extracting time information included in broadcast information received by the receiving device, and a device for correcting a timekeeping operation of a timekeeping device based on the time information extracted by the extraction device. 41. A device that adds the time information generated by the timing device to the power transmission line current information detected by this device and sends it out. i will be done.

Preferably, this receiver 1-device is activated in response to a signal from a timekeeping device only during a predetermined time period relative to the time at which time information is to be provided. Preferably, the timing of the operation of the device, that is, the timing of detecting the signal (power transmission line current information) and the timing of sending out the information, is determined by the timing operation of a clock signal generation circuit, for example, a counter, based on the extracted time information from the extraction device. Corrected based on

A power transmission line monitoring system according to the present invention is configured by disposing the above-described power transmission line monitoring device according to the present invention at a plurality of predetermined positions on a power supply line consisting of a power transmission line or the like.

[Operation] The monitoring device according to the present invention is provided with a clock device that always accurately generates time information, and the time information from the clock device is added to the transmitted power line current information and sent to the central monitoring device. sent to a certain place.

Therefore, at the central monitoring station, it is possible to determine whether or not the transmission line current information sent from each monitoring device is the transmission line current information detected at the same time. Since current information also includes time information, it is possible to create transmission line current information at the same time based on this time information, which makes it possible to accurately locate the accident section and accident point. becomes.

Moreover, if the extracted time information is used as a synchronization signal for synchronizing the operations of each monitoring device, synchronized operations of each monitoring device can be easily realized.

[Embodiment of the Invention] FIG. 1 is a diagram showing an example of the configuration of a power transmission line monitoring system that is an embodiment of the present invention. Referring to FIG. 1, the current flowing through the power transmission line 1 is detected at each predetermined point on the power transmission line 1 in the same way as in the past, and the detected power transmission line current information is transmitted from the central monitoring station MS. Monitoring device LSI~L for
Sn is provided.

Each of the monitoring devices LSI to LSn provides transmission line current detection information, for example, every hour, in order to prevent a time lag in the transmission line current detection information caused by a difference in distance between the central monitoring station MS and each of the monitoring devices LSI to LSn. a receiving device 20 that receives wireless broadcasting including time information (on the hour information); an extracting device 21 that extracts time information included in the broadcast information received by the receiving device 20; A clock function circuit 22 that generates time information and corrects its timekeeping operation (i.e., time adjustment) in response to the time information extracted from the extraction device 21; and a transmission terminal 11' which adds and transmits the time information.

Here, in FIG. 1, a sensor for detecting power line current and a signal processing unit that performs predetermined signal processing on the signal from this sensor are omitted for the sake of simplifying the drawing. The receiving device 20 includes a time 31 function circuit 22
In response to a signal from the radio broadcast, it is activated and becomes ready for reception only during a predetermined time width period relative to the period in which the time information included in the radio broadcast is given.

Various configurations are applicable to the extraction device 21. For example, the radio broadcast received by the receiving device 20 is N.
In the case of HK broadcasting, a signal of a predetermined frequency is first given three times at one-second intervals for three seconds prior to the hour information, and then time information of a frequency one octave higher than this predetermined frequency is transmitted. Therefore, a time information extraction circuit can be easily configured by generating a pulse in response to a signal of a predetermined frequency that is applied next after this signal of a predetermined frequency is applied three times at intervals of one second. I can do it.

The clock function circuit device 22 has an internal clock section that performs a unique timekeeping operation, and at this time, time information derived by the J[ section is given to the transmission terminal 11'. For example, as shown in Figure 4, a counting circuit that counts clock signals from a unique oscillator provided inside the device is provided, and time information is generated in response to the output of this counting circuit. , and at this time, if the 8I counter operation is corrected by the time information extracted from the extraction device 21, a clock function circuit that can always generate accurate time information can be realized. That is, the extraction device 21
The counter output indicating minutes and seconds is reset in response to time information from Sometimes, the time information is not corrected, but if the time information is advanced by one when the time information extracted before this pulse is given, the clock can easily make corrections for hours, minutes, and seconds. A functional circuit can be realized. The clock function circuit 22 generates a pulse for a predetermined time width (for example, from 1 minute before the time information is received until the time information is received) relative to the time when the time information is to be included in the received broadcast information, and provides the pulse to the receiving device 20. As a result, the receiving device 20 is enabled to receive data only during the predetermined time period.

Thereby, power consumption in the receiving device 20 can be reduced. Instead of generating a signal from the clock function circuit 22, the receiving device 20 is provided with a timer function, and the receiving device 20 is provided with a timer function to generate a signal from the clock function circuit 22.
It is also possible to adopt a configuration in which 0 power is turned on. At this time, in order to cut off the power to the receiving device 20, a configuration may be combined in which the power is turned off in response to the extraction time information from the extraction device 21. Next, the operation will be briefly explained.

The clock function circuit 22 in each monitoring device generates time information using its own built-in clock function and provides it to the transmission terminal 11'. The transmission terminal 11' connects the power transmission line 1 at predetermined intervals.
The time information from the clock function circuit 22 is sent onto the signal line 2 along with the current information flowing through the clock function circuit 22. When the clock function circuit 22 reaches the time when it should receive the time information included in the radio broadcast according to its internal timekeeping operation, it generates a signal and sends the signal to the receiving device 2.
Give to 0. The receiving device 20 is powered on in response to an activation signal from the clock function circuit 22 and becomes ready for reception.
The received information is given to the extraction device 21. Time information included in the radio broadcast is extracted by the extraction device 21 and provided to the clock function circuit 22. The clock function circuit 22 corrects its timekeeping operation and time information based on the time information extracted from the extraction circuit device 21. Therefore, the time information generated by the clock function circuit 22 is always accurate, and the time information derived by each of the monitoring devices LS1 to LSn is the same, that is, synchronized time information. Each monitoring device L
The information sent from SI to LSn is sent to the central monitoring station MS via the information transmission path 2. The central monitoring station MS detects the power transmission line current information and time information transmitted from each of the monitoring devices LS1 to LSn, and detects at what time the detected information was sent from each monitoring device.

As a result, even if there is a time difference in the transmission line current information transmitted by each of the monitoring devices LS1 to LSn, the central monitoring station MS can transmit the transmission at the same time based on the time information attached to each transmission line current. Wire current information can be reconstructed. In other words, if the central monitoring station MS prints out or displays the transmission line current information and time information sent from each monitoring station, for example, a person can see the transmission line current at the same time by looking at each current information and time information. The information can be easily rearranged, and thereby it is possible to determine whether an accident has occurred on the power transmission line and to locate the accident section and point based on the transmission line current information at the same time.

In the above configuration, a configuration is shown in which transmission line current information and detection time information are simply added and transmitted, but at this time, since the clock circuits that provide information detection operation timing in each monitoring device are not synchronized, each It is also conceivable that a time difference may occur in the detection operation of the monitoring device. In order to prevent such errors in detection time in each supervisory device, for example, as shown in FIG.
In each of the signal processing unit] 0 and the transmission terminal 11'
If the time information extracted by the extraction device 21 is given to the counter 12 as a reset signal to the counter 12 which provides the operation timing, the counter operation in the counter 12 will always be synchronized with the time information, and each monitoring device It becomes possible to synchronize the time points at which the counters start counting, and it becomes possible to synchronize the transmission line current information detection timing and transmission timing in each monitoring device in all the monitoring devices.

In the embodiments described above, the measurement target monitored by the monitoring device is a current flowing through a power transmission line, but instead of this, the monitoring device of the present invention can be applied to power lines such as underground cables.

[Effects of the Invention] As described above, according to the present invention, time information included in radio broadcasting is extracted, and the time information generated by the built-in clock function circuit is corrected using the extracted time information as a synchronization signal. In addition, the time information from this built-in clock function circuit is added to the transmission line current information and sent to the central monitoring station, so the central monitoring station always monitors the transmission lines of all monitoring devices. The current information detection time can be ascertained, so power can be transmitted at the same time in the event of an accident, etc.! ! 3I current information can be constructed, making it possible to accurately locate the accident area and point. In addition, by using this extracted time information to synchronize the timing of power transmission line current detection and information transmission in each device, the operation of each detection and monitoring device can be synchronized without using a complicated circuit configuration. It is possible to easily realize this.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of the configuration of a power transmission line monitoring system that is an embodiment of the present invention. FIG. 2 is a diagram showing an example of a specific configuration of a monitoring device that is an embodiment of the present invention. FIG. 3 is a diagram showing an example of the configuration of a conventional power transmission line monitoring system. FIG. 4 is a diagram schematically showing an example of the configuration of a conventional monitoring device. In the figure, 1 is a power transmission line, 2 is an information transmission line, 10 is a signal processing unit, 11.11' is a transmission terminal, 12 is a counter,
13 is an oscillator, 20 is a receiving device, 21 is a time information extraction circuit, 22 is a clock function circuit, LS, LSI to LSn are monitoring devices, and MS is a central monitoring station. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. Figure 2 In dimension 919

Claims (6)

[Claims] (1) Receive current detection information flowing through the power supply line from sensors installed at each predetermined point on the power supply line, perform predetermined processing on the received current information, and send it to a central monitoring station. , the device is installed at a predetermined point on the power supply line to receive outputs from a plurality of sensors, and is installed in the device and performs a timekeeping operation to generate time information. means for receiving radio broadcasts including time information; means for extracting time information from broadcast information received by the receiving means; and means for extracting time information from the broadcast information received by the receiving means; A power transmission line monitoring device comprising: means for correcting a timekeeping operation of an information generating means; and means for adding time information from the time information generating means to the processed current information and transmitting the same. (2) The receiving means is activated only for a period having a predetermined time width with respect to the time when the time information included in the radio broadcast is to be given, in response to a signal from the time information generating means. A power transmission line monitoring device according to claim 1. (3) The device has a timing clock generation means for giving the operation timing of the device, and the clock generation timing of the timing clock generation means is determined in response to a time information extraction signal from the extraction means. The power transmission line monitoring device according to claim 1 or 2, further comprising means for correcting. (4) Receive current detection information flowing through the power supply line from sensors installed at each of a plurality of predetermined points on the power supply line, perform predetermined processing on the received current information, and send it to a central monitoring station. A power transmission line monitoring system including a plurality of devices for transmitting electricity provided at each predetermined point on the power supply line, each of the plurality of devices comprising:
Each of the plurality of devices is configured to receive outputs from a plurality of sensors, and each of the plurality of devices includes: means provided within the device and performing a timekeeping operation to generate time information; and means for receiving radio broadcasts containing time information. a means for extracting time information included in the broadcast information received by the receiving means; and a means for correcting the timekeeping operation of the time information generating means in response to the time information extracted from the extracting means. A power transmission line monitoring system comprising: a means for adding time information from the time information generating means to the processed current information and transmitting the same. (5) The receiving means is activated only for a period having a predetermined time width with respect to the time at which the time information of the radio broadcast is to be given, in response to a signal from the time information generating means. The power transmission line monitoring system described in scope item 4. (6) Each of the plurality of devices has timing clock generation means for providing the operation timing of the device, and each of the devices responds to a time information extraction signal from the extraction means, 5. The power transmission line monitoring system according to claim 4, further comprising means for correcting clock generation timing of said timing clock generation means.