JPH03186774A - Transmission line accident tower location device - Google Patents

Abstract

PURPOSE:To surely locate a steel tower accident with reduced labor for installation and simple circuit constitution by providing a means to detect a current flowing to the earth from the steel tower and a means to decide whether the steel tower is faulty one or not from the above detection output. CONSTITUTION:The current of an earth line 7 connected to the earth terminal of steel tower leg is detected by a current detector 5 constituting of an optical CT. By the detector 5, an induced current is generated with a magnetic field induced by the current of earth line 7 and the secondary current information led out therefrom is converted to the optical signal by an electrooptical converter 55 to send it to a discriminating device 6 through an optical fiber 8. By the device 6, the optical signal is converted to the electrical signal by an optoelectric converter 61, and when this signal is concluded as higher than a reference level by a comparator circuit 62 and also is decided as existed in the range from the minimum to maximum duration by a monitoring circuit 63 for continuous current continuation cycle, the occurrence of accident is displayed. By this procedure, the discrimination can be made whether the steel tower is faulty one or not by only the current flowing in the steel tower of one place.

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a device for locating a failed tower in a power transmission system, and particularly relates to a device for locating a failed tower in a power transmission system without an overhead ground wire. [Prior Art] Since high power is transmitted in the transmission 'fFls line, a structure with sufficient resistance to Lf is adopted. However, in power transmission lines, a large voltage is generated in the power line due to a ground fault caused by a lightning strike, causing dielectric breakdown of the insulator, and then a large current is transmitted to the steel tower suspending the power line through the insulated insulator. flow,
This may lead to power outages, etc. When an accident occurs on such a power transmission line, it is necessary to promptly locate the section or point where the accident occurred or the accident tower, and take action against the accident. For this reason, conventional and various multiple point location methods have been proposed and put into practical use. One such method for locating fault points is, for example, the method shown in Japanese Unexamined Patent Publication No. 170224/1983. In this prior art, current is applied to the overhead ground wires on both sides of the tower. A detection sensor is installed, and the half section or multiple towers are located from the current phase difference of the sensor output.Fault points are also located by comparing the detected current values and current phase differences from multiple points. Kawashima'! , 9 discloses a configuration in which an accident point is located using an electric field sensor for detecting electrical elevation table provided at the upper part of the steel tower and a magnetic field sensor provided at the lower part of the steel tower. At the bottom of this groove such as Kawashima, a magnetic W sensor detects the difference between the magnetic flux density induced by the negative j current and the magnetic flux density induced by the 1f current (follow-on current) when a 9g fault occurs. In order to prevent erroneous judgments due to induced noise or load fluctuations, take advantage of the fact that the electrical equipment in the substation is temporarily disconnected, and as a result, there is no voltage on the transmission line. , this electric field change is monitored by an electrostatic sensor, and this electric field change is used as the operating condition for orientation operation. Also, lecture number 126 on page 9-217 of the same Proceedings East
In Part 3, ``A survey of abnormal phenomenon detection methods on power transmission lines'', Kai C used sound pressure sensors to detect the impact sound that occurs when lightning strikes or ground faults occur, which causes steel tower members to be carried away. A method for detecting the occurrence of an accident and the location of the accident on a steel tower by detecting the sound of a steel tower being carried is disclosed. [Problems to be Solved by the Invention] In the method disclosed in Japanese Unexamined Patent Publication No. 61-170224, a current flowing through an overhead ground wire is detected, and a decimal section is located from the current value difference and/or phase difference. Therefore, 66
This method cannot be applied to a power transmission system in which an overhead ground wire is not provided, such as a power transmission line of less than Kv. In addition, in this force method, the outputs of sensors installed on multiple steel towers are transmitted to one determination device via optical fibers, etc., and the current information at multiple points, that is, each phase difference and current value difference, is mutually analyzed. The accident point is determined based on the compared data. Therefore, it is necessary to send the detected current as it is to the point where the determination device is installed, and also to compare the phase difference, so it is necessary to use information at the same time as information on each sent current. Therefore, it is necessary to detect current information at the same time and to send current information to one location, which complicates the device configuration and requires a signal transfer path, which increases the device price. Kawashima et al.'s detection method requires an electric rise sensor, a magnetic field sensor, and a bipolar type sensor, and the electric rise sensor is installed at the top of the tower, while the magnetic field sensor is installed at the bottom of the tower, so the detection equipment is Installation work becomes complicated, labor and n,1
A problem arises in that the installation work requires 7 hours. In addition, in the method of Kawashima et al., magnetic flux is generated by the load current even at all times, and the detected magnetic flux density changes depending on the mounting position of the magnetic field sensor. It is necessary to precisely determine the accent of the first shift, and this requires delicate adjustments to the threshold settings that serve as judgment criteria, resulting in a decrease in work efficiency and an incorrect threshold value. In addition, in this Ω-specific method, if an object that emits electromagnetic waves that simultaneously change both the electric rise and the magnetic field, such as a radio from a broadcasting type, comes near the sensor. There is a possibility that this detection device will malfunction. Kai et al.'s method detects the sound pressure waves propagating through the tower members, but the tower has Because there are many parts such as metal fittings that have discontinuous points as sound propagation paths, sound pressure waves at a detectable level do not reach the sensor due to reflection and attenuation of the propagated sound, resulting in accidents. In some cases, detection may not be possible, and in order to avoid this, it is necessary to install a large number of sensors, which requires a lot of labor and time to install the sensors, resulting in a problem of poor work efficiency. The purpose of the invention is to provide a device that can be installed with little effort even in a power transmission system where an overhead ground wire is not installed, and that can accurately locate an accidental tower with a simple circuit configuration. [F-stage for solving the problem] The ・j1 fallen steel tower (quantification device) according to the present invention includes a means for detecting the current flowing from the steel tower to the ground, and a means for detecting the current flowing from the fallen steel tower to the ground based on the output of this current detection means. A means is provided to determine whether the
A large voltage is generated instantaneously, and this large voltage causes dielectric breakdown of the insulator, which is the support member that suspends the power transmission line from the steel tower, and then a large transmission line current (follow-on current) flows through the broken insulator. Flows to the tower. Or, when an accident occurs where the insulator is shorted due to damage from birds, the current flowing through the transmission line flows into the steel tower. If there is an overhead ground wire 7j, the follow-up flow that has flowed into the steel tower is divided into the direction of the overhead ground wire and the ground. If there is no overhead ground wire, all of this flow will flow from the tower to the ground. At normal times, almost no current flows through the tower, but
1. When the vehicle is accidentally seated, a current of at least several tens of amperes flows. Regardless of the presence or absence of this overhead ground wire, by detecting the current flowing from the tower to the ground, it is possible to detect whether a TL fault has occurred in the steel tower or a cup without the need to set complicated thresholds. be able to. [Embodiments of the Invention] Before explaining the present invention in detail, first, the 4P1 fixed principle of the present invention will be explained. FIG. 2 schematically shows the flow of fault current (follow-on current) in the faulty tower when a - line ground fault occurs. In Figure 2, in a power transmission system without an overhead ground wire, if a ground fault occurs in the transmission line 2 at the bottom of the tower 1, the A current (follow-on current) flows into the tower 1. Since this tower 1 is not equipped with an overhead ground wire, the fault current 11 flows into the tower 1.
Divided to the main tower legs (usually four legs of a steel tower), current ■2
~15 and flows into the earth from each tower pedestal. The currents 2 to 15 flowing into the ground become current 10 and return to the neutral point of the power supply using the ground as a return path. Some of the current flowing from the tower legs to the ground is current that flows directly from the tower legs to the ground, but if a grounding wire is buried within the tower site, it is only possible to ground from the grounding terminal located on the tower legs. Since the construction is such that the tower is grounded by connecting to this grounding wire using a wire, most of the fault current flows to the ground via this dedicated grounding wire. During normal times, almost no current flows through this dedicated grounding line, but when an accident occurs, a current of at least several tens of amperes flows. Therefore, by monitoring the current flowing through this dedicated grounding line, it is possible to easily detect whether or not the tower is a No. 11 steel tower without making delicate threshold adjustments. FIG. 3 illustrates an example of an installation form of a steel tower locating device according to the present invention. In FIG. 3, for each of the steel towers 1a to 1e, current detectors 5a to 5e and discrimination devices 6a to 6a are used.
6e is provided. Each of the current detectors 5a to 5e is provided in the corresponding steel tower 1a to 1e7F section, and detects the current flowing through the corresponding steel tower. The ill devices 6a to 6e have corresponding current detectors 5a to 5.
Upon receiving the detected current information from e, it is determined whether a T-lf fault has occurred in the corresponding steel tower. These discrimination devices 5a to 6e
Each of the cows may be provided with a display device indicating whether there is one calve or not. In addition, when this power transmission system has a single-end power supply condition, each of the current detectors 5a to 5e is connected to a tower pedestal close to the power supply side, since fault current flows through a grounding wire close to the power supply side. Provided for the ground wire. Here, in the following description, the grounding line includes both the dedicated grounding line and the buried grounding line. In the embodiment shown in FIG. 3, it is possible to detect the value of the current flowing through the steel tower and determine whether the steel tower is a 91 steel tower or an apricot tower based on the detected value. Therefore, there is no need to extensively compare detected current information between two distant points, and it is possible to detect an accidental tower using an open system configuration. In addition, even in power transmission systems where optical fiber composite overhead ground wires are not installed, if the identification device on each tower is equipped with a display function, it is possible to easily By sequentially inspecting each tower, it is possible to determine whether it is a vehicle tower or not. FIG. 4A specifically shows an example of how the location device is mounted on one steel tower, and FIG. 4B shows an enlarged view thereof. 4th A
Referring to the drawings and FIG. 4B, a grounding wire 7 is connected between the ground terminal 11 provided at the lower part of the pylon pedestal 10 and the earth, so that the pylon pedestal 10 is grounded. In order to detect the current flowing through the grounding wire 7, for example, an optical CT
A current detector 5 constituted by a (current transformer) is provided. The detection information of the current detector 5 is sent to another device 6 via an optical fiber 8 to avoid the influence of electromagnetic induction noise.
transmitted to. The discrimination device 6 is similarly provided at the lower part of the steel tower leg 10. As is clear from FIGS. 4A and 4B, both the current detector 5 and the discrimination device 6 are configured to be installed at the bottom of the steel tower, so there is no need to work at high places when installing this locating device. , it becomes possible to easily attach the orientation device. In addition, the current flowing through this grounding wire 7 was several tens of amperes during the Heisei era, and almost no current flows during normal times, so
There is no need for a delicate 1:33 adjustment in the setting of the threshold value that serves as the basis for accident judgment in the discriminator 6, and it is possible to easily represent the value for the basis of accident judgment. It should be noted that this positioning device does not need to be installed on all steel towers. ・JI accident occurrence i1i 1t (points with a high degree of i are based on empirical predictions of 101 degrees, so ・1G accident occurrence points If the location device is sunk into a nearby steel tower, an efficient and economical location system can be constructed.Next, referring to FIG. A different configuration and operation of the destination locating device will be explained. In Fig. 1, the current detector 5 is configured by optical CT and detects the current flowing through the grounding wire 7 connected to the grounding terminal of the tower foot. The current detector 5 includes a core 5 that generates an induced current due to the magnetic field generated by the current flowing through the grounding wire 7.
1, a coil 52 wound around the core 51 to derive a secondary current, a bidirectional constant voltage diode 53 for suppressing the voltage generated across the coil 52, and a current limiting resistor 54.
and an electric-first converter 55 that converts the secondary current information derived by the coil 52 into an optical signal. The core 51 is hollow, and the ground wire 7 passes through the hollow portion. The ground line current information converted into light fJ by the electro-optical converter 55 is transmitted to the discriminator 6 via the optical fiber 8. The il separate device 6 includes an optical-to-electrical converter 61 that converts an optical signal transmitted through the optical fiber 8 into an electrical signal, and a level comparison circuit that compares the signal from the optical-to-electrical converter 61 with a predetermined level. 62, a follow-on current continuation cycle monitoring circuit 63 that receives an electrical signal from the optical-to-electrical converter 61 and monitors whether a current of a predetermined level or higher, that is, a follow-on current continues for a predetermined period; and a level comparison (c). 62 and a logic circuit 64 that disconnects multiple number generation and t, 11 based on the follow-on continuation cycle monitoring four-way 63 output and activates a display device 65. The level comparison circuit 62 is grounded! ! ; Compares the current level flowing through I7 with a predetermined standard level, and outputs a signal according to the comparison result. Does the follow-on continuous cycle monitoring circuit 63 flow through the ground wire 7?
15 The number of cycles in which the current level exceeds a predetermined reference level is monitored, and the current exceeding the predetermined reference level, that is, the follow-on current, continues for a predetermined number of cycles or more, and this follow-on current prevents the interruption operation at the substation. After a predetermined number n of consecutive cycles of detecting a change in the current decreasing and following it beyond its predetermined base level. Only if it is above and the maximum number is 2'1゛111 or less'! 1 As an accident ';i PI! The occurrence of the multiplex number is displayed on the display device 65 through the I"l path 64. Therefore, the same paste 64 indicates that the level comparison circuit 62 detects the i11 disconnection when the current level flowing through the grounding wire 7 is equal to or higher than the predetermined standard level. And the follow-on continuation cycle monitoring circuit 63
Only when it is determined that the ground wire current of a predetermined reference level or higher has existed for a minimum duration time or longer and a maximum duration time, the display device 65 is activated to display that an It failure has occurred in the steel tower 1. By using this flow continuation cycle monitoring circuit 63, it is possible to prevent malfunctions caused by induced noise and negative 6 (f fluctuations), and it is possible to accurately determine +JG failure.Next, The operation of the locating device shown in FIG. 1 will be briefly explained with reference to FIG. 5, which is an operation flowchart. is derived in the form of an optical signal and delivered to the discriminator 6 via the fiber 8.The signal from the current detector 5 is converted into an electrical signal by an optical-to-electric converter 61 and then sent to a level comparison circuit. 62 and follow-on continuous cycle monitoring circuit 63.
＼Can be placed. When the level comparison circuit 62 detects that the signal level from the current detector 5 is higher than a predetermined reference level, it is determined that an abnormality has occurred (step S2). In response to this abnormality detection, the follow-on continuous cycle monitoring circuit 6
3 is also activated and the duration of current exceeding this predetermined reference level 11:i b++ (cycles) is counted (
Step S4). When a failure occurs, the power transmission to the power transmission line where the +1 (failure occurred) is stopped. Therefore, by detecting this power transmission failure, the
It can be used as a basis for determining whether the JG was fired or a cup.1. 1117 Malfunctions due to conduction noise and load fluctuations
+I- (step S6). That is,
The follow-on continuation cycle monitoring circuit 63 detects this product continuation g:;
In response to the power transmission stop l2 detection signal, it is determined that the abnormal duration is greater than or equal to the minimum predetermined value and less than or equal to the maximum predetermined value nl! Circuit 64・\Inform. Based on the information from the follow-on continuation cycle monitoring circuit 63, the logic circuit 64 adds +11 when the 41 fault has occurred (Step S8), and starts the display device 65 to display the occurrence of the 1j fault (Step 510). . Next, an example of a specific configuration of the discriminating device will be described with reference to FIG. 6. In FIG. 6, a level comparison circuit 62 includes a peak hold circuit 621 that monitors the analog signal obtained from the opto-electrical converter 61, holds the peak value at predetermined intervals, and outputs the peak value. It includes a base level setting circuit 622 that outputs the base value of , and a comparison circuit 623 that compares the output of this standard level setting 1111 path 622 and the output of the peak hold circuit 621 . The follow-on continuation cycle monitoring circuit 63 and the logic circuit 64 are
A retriggerable one-shot pulse generation circuit 631 generates a signal with a predetermined pulse width by using the signal from the four-way comparison circuit 623 as a signal, and is activated in response to the pulse signal from the one-shot pulse generation circuit 631 to generate a standard signal. A counter 633 that counts the number of pulses from the pulse generating circuit 632 is included. The counter 633 further compares the set count value from the count price window circuit 635 that sets the minimum count value and the maximum count value with the actually counted count value, and determines that the actual count value is the count value setting II! It includes a circuit that operates the display device 65 only when the count value set by the count value 635 is 1.Next, the operation 1'1 of the circuit shown in FIG. This will be explained with reference to FIG. 7 which is a waveform diagram.The peak hold four-way circuit 621 outputs the peak value for each predetermined period and supplies it to the comparison circuit 623.The peak value holding period of this peak hold circuit 521 is as short as possible. Although the period is unreasonable, if it is too short, the influence of noise cannot be removed, so this peak hold period is determined to an appropriate value.The comparison circuit 623 uses the reference level obtained from the reference level setting circuit 622. and the output of the peak hold circuit 621 (FIG. 7(a)). The output signal from this peak hold low path 621, that is, the current level flowing through the ground wire 7 is the reference level setting circuit 6.
22 exceeds the level set by the comparison circuit 623.
An active signal is output from , and one-shot I/pulse generation l! 1j is added to 11th road 631. In response to the output signal from the comparison circuit 623, the one-shot pulse generation circuit 631 generates one cycle of human power No. 13 (in commercial power supply, the follow-on frequency is 50 Hz or 6 (IHz), which is the frequency of this locating device). Suitable depending on the application!-1
), outputs a one-shot pulse with a pulse width Fi that is approximately 50% longer. This one-shot pulse generation circuit 631 is retriggerable, and the comparison circuit 62
It is triggered in response to the output of step 3 and generates a one-shot pulse again. Therefore, when the output signal from the peak hold circuit 621 continues to exceed the reference level, the one-shot pulse generation circuit 631 outputs an apparently continuous pulse signal due to this 111 trigger operation (7th Figures (b) (C)). The counter 633 is moved in response to the pulse t= from the one-shot pulse generation circuit 631, and during the period when this pulse signal is applied, the counter 633 is moved to a predetermined value of the base Q7 (It is obtained from the pulse generation circuit 632). Count the number of pulses No. 15 that make the period H (Figure 7 (d), (e
) ). Now, if an accident occurs and the relay is tripped at the substation, and the voltage to the transmission line is 0 (the supply is stopped), the output of the comparison circuit 623 becomes inactive, and the one-shot pulse generation circuit 631 is retriggered. The operation is i'':'+. Therefore, this one-shot pulse generation circuit 6
In response to the end of 31 pulses, counter 633 stops counting. The counter 633 compares this count number with the count value set by the count value adding circuit 635, and determines whether the count value is between the minimum setting value and the maximum setting value. If this count is between the set count values, the counter 633 determines that the .jI release has occurred, and sends a display activation signal to the display device 65. If this count is greater than or equal to the maximum set value, the counter 633 determines that this current fluctuation, that is, the 5+, 5 normal state, is caused by the load fluctuation.

[Therefore, no determination will be made. If this count is less than the minimum set value, it is assumed that the number of vehicles is a color of induced noise llj, and the number of vehicles is not determined. This count 1 shift setting Ii″1
The minimum count value and maximum count value set for one path 635 are set in an appropriate chain by taking into account the influence of inductive noise and the time required from the occurrence of the i1 fault to the tripping of the relay to the substation. Note that for the above embodiment, the counter 633 is used to
Detects the period during which the abnormal condition continues, sets the number of continuous cycles of the follow-on current that exists before the interruption at the power station, and if the abnormal condition exceeds this number of continuous cycles, However, instead of using this configuration, it is possible to detect the power transmission outage that occurs in rlt when an accident occurs. Furthermore, in the above embodiment, the light density is detected by comparing the current flowing through the grounding wire with the busy level determined by T. may be configured to always store the level of current flowing through the grounding wire, and use this constantly flowing current level as a comparison reference level to perform hole detection. The equipment is equipped with a display device, and is configured to display whether an accident has occurred near the tower. From the installation point of the vessel, the ship's next point becomes steeper, and the steel tower where the formation occurred is identified by the display device.Instead, U
It is also possible to have a configuration in which 3J is used. Furthermore, in the above embodiment, the occurrence of an accident is detected by analog processing the overhead ground wire current, but this can be done digitally using a microcomputer or the like. It is also possible to detect the 5' (normal) level by converting the analog signal into a digital 15, and converting this digitally converted signal to the 14-foot comparison reference level (which has been run in advance). (or the constant induced current level, which can be stored in a memo when using a microcomputer), and based on this comparison, determine the r71 error. It is also possible to detect the presence or absence of light soil. Fig. 8 shows a flowchart for detecting faults during such digital signal processing. Next, referring to Fig.
The operation of detecting the .11 error when such a digital block is detected will be briefly explained. First, the analog signal 111 detected by the current detector
The current level is converted to digital (No. 7) and compared with the comparison signal At (step 520). If this current level exceeds the predetermined comparison reference level At, the continuation cycle, that is, the continuation cycle of the follow-on current. A check is made to see if the number is 110 or more (step 522). If there are 110 or more consecutive cycles, it is determined that this is not induced noise, and then the number of consecutive cycles is determined to be 110 or more. A determination is made as to whether or not the value is smaller than a predetermined maximum setting value]11 (step 524).As a result, the relay at the female power station is tripped due to the occurrence of an accident, and the power transmission to the transmission line is interrupted. This means that a stop has been performed or a cup has been detected. If the number of continuous cycles is 00 or more and nl US, it is determined that an 'IG fault has occurred/L (step 52).
6) A display instruction signal is transmitted to the display circuit (step 528). By the above-described operation, abnormality detection can be performed digitally. Although the operation flow diagram for the 11 fault detection 1 shown in FIG. 8 has been described as being performed digitally using a microcomputer, this operation flow is based on analog processing of the signal PL! It is also possible to apply the present invention to a circuit configuration that detects the Heisei period. [Effects of the Invention] As described above, according to the present invention, the current flowing through the tower to the ground is detected, and it is determined whether the tower is in an accident or not based on the detected current level. It consists of Therefore, it is possible to determine whether a steel tower is a steel tower or a steel tower based on the current flowing through a steel tower at one location, and current information at another point far away can be transmitted. There is no need to compare the positioning device, and the configuration of the locating device system can be simplified. Furthermore, since it is not necessary to compare current information at two points, there is no need for 15 channels for transmitting this current information, and 1. : This positioning device can be applied even in power transmission systems where there is no road, for example, an aerial J1J! Even in power transmission systems where lines are not installed, 73g fallen steel towers can be reliably and easily detected. In addition, since it is possible to estimate points where many accidents occur empirically, if a positioning device is installed near these points where small accidents occur, it will be possible to easily detect the point where 11 accidents have occurred, and other An efficient and effective locating device system can be constructed by combining it with a locating system or by using only this locating device. Furthermore, since only one type of current detector is installed at the bottom of the tower, there is no need for any obsessive work or power outage work, making it easy to install the location device.
Installation work is simplified. In addition, when detecting the current flowing through the steel tower, it is 0, and the detection level threshold is 1. '7 is as large as several tens of amperes, so the threshold value can be easily set in advance for each locating device, and the device installation work is simplified. In addition, by using a flame current transformer (CT) installed to surround the grounding wire connected to the tower leg and detecting only the magnetic field caused by the current flowing through the current transformer's penetration part, 'C' fault current can be detected. Since this is detected, it is possible to prevent malfunctions caused by electromagnetic interference caused by radio=9. Furthermore, when detecting the main current of the grounding wire, it is possible to downsize the current transformer for current detection, and an inexpensive locating device can be realized. Furthermore, the current detector and 711 separate equipment can be easily found on the tower at any location, and the current in the ground wire is only monitored at the base of the tower. The location device can be easily installed without being affected by fIII etc. at the location of the power transmission system where the location device is applied.

[Brief explanation of drawings]

Figure 1 shows the H! [It is a diagram showing the We1 configuration. FIG. 2 is a diagram for explaining the all-fixing principle on which the locating device of the present invention relies. FIG. 3 is a diagram showing an example of the mounting form of the locating device according to the present invention. Figure i4A and Figure 4B are diagrams specifically showing how the positioning device is mounted on one steel tower. Figure 5 shows the first steel tower location device according to this invention! FIG. 2 is a flowchart schematically showing the operation of fault point detection. FIG. 6 is a diagram showing an example of a specific configuration of a discriminating device for a second steel tower locating device, which is an embodiment of the present invention. Figure 7 is the 6th
FIG. 3 is a signal waveform diagram showing the operation of the bjl path shown in the figure. 8th
The figure is a diagram showing the operation flow for detecting the occurrence of multiple numbers by the locating device according to the present invention. In the figure, 1. la, lb, lc, ld, 1e are steel towers, 5.5a, 5b, '5c, 5d, 5e are current detectors,
6, 6a, 6b, 6c, 6d, and 6e are discrimination devices, 7 is a grounding wire, 8 is an optical fiber, 10 is a steel tower leg, 62 is a level comparison circuit, 63 is a follow-up continuation cycle monitoring circuit, and 64 is a logic circuit. , 65 is a display device, 621 is a peak hold circuit, 622 is a low level setting circuit, 623 is a comparison circuit, 6
31 is a one-shot pulse generation amount 7L632 is a semi-pulse generation circuit, 633 is a counter, and 635 is a count value setting l! ! There is one route. In the figures, the same number 71 indicates the same or equivalent parts. ] S, (Nishi I crouching/・'7 te da n tip/ρ, Tetsuwa Ne Shizuku ζ throat

Claims (3)

[Claims] (1) A device for locating a faulty pylon on an overhead power transmission line, comprising: means provided on the pylon for detecting a current flowing from the pylon to the ground; and detecting the current in response to the output of the current detecting means. A power transmission line accident pylon locating device comprising a means for determining whether an accident has occurred in a pylon on which the means is installed. (2) The power transmission line accident tower locating device according to claim 1, wherein the current detection means includes means for detecting a current flowing through a grounding wire disposed between a tower leg and the ground. (3) The discriminating means includes means for monitoring the duration of follow-on current that occurs when an accident occurs, and in response to the output of the monitoring means and the output of the current detecting means, the discriminating means detects an accident in the steel tower on which the current detecting means is installed. provided with a means to determine that a has occurred;
A transmission line accident tower locating device according to claim 1.