JPH0736655B2 - Method for detecting abnormal phenomena in power transmission network - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION “Industrial Application Field” The present invention detects a sound generated near a power transmission line as a propagation sound of a structure for a power transmission line, and compares the magnitudes of the propagation sound. The present invention relates to a method for detecting an abnormal phenomenon in a power transmission line network, which determines an accident point in the power transmission line network.

“Prior art” When an electric accident such as a ground fault or a short circuit between phases occurs or a mechanical accident occurs in a part of the transmission line network, a great deal of labor is required to search for the accident point manually.

Conventional techniques for searching for a fault point in a power transmission line network include, for example, Japanese Patent Laid-Open No. 62-206465 [Faulty power line fault zone locating device] and Japanese Examined Patent Publication No. 63-7626 [Shenshin accident tower Detection method], Japanese Patent Publication No. 63-13152 [Transmission line failure remote monitoring device] and the like.

Of the technology, the fault current flowing through the overhead ground wire is transmitted to the destination using the optical fiber composite overhead ground wire based on the occurrence of the ground fault accident, and the special index is obtained and calculated by the current value and the phase. In this connection, the fault area is located, and the technology of (1) detects the current flowing into the tower by a current transformer and compares the phases when a flashover accident occurs in the tower. In connection with this, the technology for detecting a flashover accident tower is used to detect the operation signal of the transmission line accident detector installed in each tower when a transmission line accident such as a lightning strike occurs. The failure point is located by connecting it to a foro-torquer.In all of these technologies, when a ground fault occurs in a transmission line due to a lightning strike, the fault occurrence point can be set in a remote place such as a substation. It is possible to orient .

"Problems to be solved by the invention" However, abnormal phenomena that may occur in a transmission line network are not limited to electrical accidents including lightning strikes, ground faults, short-circuit accidents, etc., as well as deformation of tower components and transmission lines. Abnormal mechanical phenomena such as cutting of a wire, disconnection of insulators, etc., and abnormal loads and vibrations caused by wind, rain, and snow, and so on.Therefore, it is not enough to detect only abnormal phenomena centered on the above-mentioned electrical accidents. is there.

On the other hand, a large number of sensors with different functions that are suitable for each item of abnormal phenomenon are installed on the tower, and by transmitting detection signals to remote locations such as substations, monitoring of the transmission line network, maintenance, and accidents However, in the method using the sensors having different functions, the collection and transmission of data are likely to be complicated and the practical cost is high.

The present invention has been made in view of the above circumstances,
(I) A method for detecting an abnormal phenomenon in a transmission line network for the purpose of coping with various abnormal phenomena using a sensor having the same function, and (ii) facilitating determination of an abnormal point. It is provided.

"Means for solving the problem" A sound generated when an abnormal phenomenon occurs in a transmission line network is transmitted to a constituent material that constitutes a structure for a transmission line. The sound-receiving level of the sound-receiving level is detected by comparing the sound-receiving levels of the detection signals detected by the sound-receiving sensors installed in the separated parts of the component with the intervening connecting part. It is determined that the larger one is closer to the position where the abnormal phenomenon occurs.

"Operation" When a sound generated due to an abnormal phenomenon occurs near the power transmission line, part of it is transmitted as a propagating sound in the components,
When the propagating sound passes through the connecting parts of the constituent materials, the energy of the propagating sound is attenuated by being reflected by the connecting parts or being branched to each intersecting constituent material. Therefore, the sound receiving level of each sound receiving sensor having the connecting portions of the constituent members interposed therebetween decreases according to the number of the connecting portions from the sound source. Therefore, from the comparison of the sound receiving level (sound size) of each sound receiving sensor, the one with the higher sound receiving level is closer to the sound source,
That is, it is determined that the position is close to the occurrence position of the phenomenon.

[Embodiment] An embodiment of a method for detecting an abnormal phenomenon in a transmission line network according to the present invention will be described below with reference to the drawings.

FIG. 1 shows that in order to carry out the method for detecting an abnormal phenomenon of a transmission line network according to the present invention, the same type of sound receiving sensor SS is attached to each part of the constituent members of the transmission line structure (steel tower) T. An example is shown.

The sound receiving sensor SS is composed of, for example, a condenser microphone, a sound pressure sensor, a vibration sensor, and the like. Specifically, in the leg (vertical component) 1 of each component, an overhead ground line position GW and Between wire position C ₁ , between wire position C ₁ and wire position C ₂ , between wire position C ₂ and wire position C ₃ , and wire position C ₃
Are installed at symmetrical positions on the power transmission line L ₁ side and the power transmission line L ₂ side so as to be positioned between the ground and the ground, and the constituent materials of the leg 1 are connected to each other in the vertical direction by bolts and nuts and the like. At the same time, a single or a plurality of connecting portions 2 that intersect with horizontal components and serve as joints of a plurality of components are provided on the way, and are installed in a vertically separated state.

Then, each sound receiving sensor SS is connected to a transmission means 3 which is formed by adding an optical fiber line OP shown by a broken line in FIG. 1 to an intermediate amplifier, an A / D converter, an electric / optical element, and the like, and The optical fiber line OP is connected to the overhead ground wire OPGW containing the optical fiber to form a signal carrier path, which is guided to a remote monitoring unit CR (see FIG. 2) such as a substation by the signal carrier path.

Further, in FIG. 2, reference numerals S1 to Sn are structures for each power transmission line.
Sound receiving units respectively installed at T _{1 to} T _n, which are configured by adding the sound receiving sensor SS and other sensors as necessary, and transmitting means as shown in FIG. It is connected to the optical fiber line OP by 3.

On the other hand, the remote monitoring unit CR includes each device provided in the monitoring center MC, that is, a data processing device DS such as a microcomputer, a display device DP, an external memory M, a printer PR, a speaker SP, and the like. Is provided with data input means DI, various discrimination means D _{1 to} D _{3, and the} like.

Further, as shown in FIG. 3, the sound receiving sensor SS is a leg (or a mold forming the horizontal arm 4 in the structure T for the power transmission line as required, which is formed of a mesh forming the structure T for the power transmission line. A small microphone 6 is attached to a component member 1 made of a net through a stethoscope 5 with a bolt 7 or the like, and a detection signal of a sound detected there is guided to the transmission means 3 described above.

As described above, the sound receiving sensor SS is attached to the separated portions of the respective components with the single or plural connecting portions 2 interposed, and the detection level of the sound receiving signal of each sound receiving sensor SS becomes the same level. As described above, if the setting is made by the intermediate amplifier in the transmission means 3 or the data input means (data input device) DI of the remote monitoring section CR, the propagation sound of the constituent material is remarkably attenuated at the connecting portion 2 based on , So as to be inversely proportional to the number of connecting portions 2 between the sound source and the sound receiving sensor SS,
Since the sound receiving level of the sound receiving sensor SS decreases, the sound receiving sensor
When there is an input from SS, the sound receiving level difference determination means
It becomes easy to determine whether the level difference is caused by D _{1 and} which sound receiving sensor SS is closer to the sound source by the sound receiving position determining means D ₂ by a simple comparison.

That is, by comparing a plurality of sound receiving levels obtained by the respective sound receiving sensors SS with each other to determine which is receiving a large propagating sound, each part of the transmission line structure T or In this vicinity, it is possible to know in which part the abnormal phenomenon has occurred.

When there is a sound source in the sound receiving sensor SS and near the tip of the horizontal arm 4 (when an abnormal sound occurs)
Table 1 shows the relationship with.

In this way, depending on the mounting position of each sound receiving sensor SS,
Utilizing the fact that there is a difference in the sound receiving level, mechanical abnormal phenomena and accidents such as disconnection accidents of insulators, lightning strikes, ground faults of electric wires, etc.
Alternatively, lightning accidents to the power transmission lines, grounding of the electric wire C ₁ -C _3, electrical anomalies and accidents one transmission line structures for T portion of the throat, such as short-circuit, or L ₁ side or L ₂ side, Which power line structure
It becomes possible to discriminate whether or not it has occurred in the vicinity of T _{1 to} T _n .

On the other hand, the sound sensor SS has a structure in which the small microphone 6 is attached to the constituent material of the leg 1 of the transmission line structure T via the stethoscope 5 to reduce the influence of ambient environmental noise (noise). It is possible to capture the sound transmitted through the constituent material, that is, the propagated sound in the solid without receiving the sound.

<Example> A sound receiving state was detected when an impact sound was applied to the constituent material (mold net) of the structure for a power transmission line (height of 60 meters) shown in FIG.

In Fig. 1, the impact point or 1c steel ball is 50c
An impact sound was generated by dropping from a height of m, and the propagation sound in the constituent material at this time was detected at the position of the sound receiving sensor.
When the number of connecting parts is 0, the sound receiving level is 0db,
The relationship with the number of connecting parts was obtained. The sound receiving sensor used was a condenser microphone with a frequency characteristic of 40 to 20000 Hz and was measured at room temperature. However, the number of connecting parts is
The minimum number between each component was taken as the standard.

The relationship between the sound receiving level and the number of connected parts is as shown in FIG.

From this result, the propagation sound in the constituent material is attenuated in energy due to the interposition of the connecting portion 2, and the degree of the attenuation is about 3.5 db per one connecting portion 2. In the case of the structure T for the power transmission line of the example of FIG. 1, since there are 5 to 6 connecting portions 2 between the sound receiving sensors SS, the sound receiving level difference becomes large and the sound receiving sensor SS is located near the sound source. Positioned sound receiving sensor SS
It is relatively easy to determine which is.

On the other hand, in the experimental example, the phenomenon in which the amount of attenuation is affected by the number of intersections of the constituent materials that form one connecting portion 2 did not appear significantly, and it was apparently negligible. The reason for this is that even if the number of intersections of the constituent materials is large in the connecting portion 2, the propagating sound branched to each of these constituent materials is circulated 2
It is considered that this is based on the fact that the propagating sound is transmitted in triple layers, and the propagating sound is reflected and superposed on a part of each component.

In addition, the amount of attenuation of the propagation sound in the range of one component is
It is considered to be significantly smaller than the attenuation amount of the propagating sound when the connecting portion 2 is interposed, so that it is neglected for convenience.

In the example of FIG. 1, the sound receiving sensor SS is installed on the leg 1, but from the result of FIG. 4, the appropriate position of the horizontal arm 6 at each wire position C ₁ to C ₃ (for example, the sound receiving sensor position)
It is also effective to install the sound receiving sensor SS.

Further, the sound receiving sensor SS detects the sound generated near the power transmission line, and the sound receiving signal of the sound receiving sensor SS is not transmitted near the power transmission line structure T, that is, to a remote place by the signal carrying path. It is also possible to analyze in the vicinity of the occurrence site, and in this case, the occurrence of the abnormal phenomenon can be discriminated by the sound reception signal alone or in combination with visual or audible sound.

Furthermore, two sound receiving sensors SS are arranged so that the connecting portion 2 is interposed therebetween, and the sound propagation direction can be determined by comparing the magnitudes of the output signals of both sound receiving sensors SS. Therefore, if a plurality of sets of such two sound receiving sensors SS are arranged at each position of the constituent material and a propagation direction signal thereof is transmitted, the abnormality occurrence point can be located from the direction distribution.

[Advantages of the Invention] According to the abnormal phenomenon detection method of the transmission line network according to the present invention, (1) each of the sound waves transmitted through the constituent members is arranged so as to be separated from each other so that the connecting portion of the constituent members is interposed. It is possible to easily detect and confirm the location where an abnormal sound caused by an electrical or mechanical abnormal phenomenon or an accident is detected by detecting with a sound receiving sensor and comparing multiple sound receiving levels (sound magnitude) with each other. .

(2) The sound generated by various abnormal phenomena is detected by using the sound receiving sensor having the same function, and the cost can be reduced with simple equipment.

(3) Since the propagating sound transmitted in the components is detected, it is faster than the aerial propagating sound transmitting various abnormal phenomena and accidents in the air, and is highly sensitive without being affected by the noise of the surrounding environment. Can be detected.

(4) Sending the received sound signal to a remote monitoring unit such as a substation using the signal carrier path in the transmission line network, and analyzing the received sound signal in the remote monitoring unit, etc. It is possible to perform the detection determination of the above in a centralized manner, and it is possible to reduce the labor and the time until the abnormality determination.

(5) The above abnormality determination can be performed near the structure for the power transmission line by the sound reception signal of the sound receiving sensor near the location where the abnormal phenomenon occurs. In this case, the occurrence of the abnormal phenomenon is detected. Accurate discrimination can be performed by using the received sound signal alone or in combination with visual or audible sound.

[Brief description of drawings]

FIG. 1 is a front view showing an example in which a sound receiving sensor is attached to a structure for a power transmission line to carry out an abnormal phenomenon detection method for a power transmission line network according to the present invention, and FIG. 2 is a power transmission line network according to the present invention. Fig. 3 is a block diagram of the entire configuration to which the abnormal phenomenon detection method of Fig. 3 is applied, Fig. 3 is an enlarged view of the sound receiving sensor mounting portion in Fig. 1, and Fig. 4 is a sound receiving sensor attached to the structure for the power transmission line in Fig. FIG. 8 is a relationship diagram between the number of connected parts of the constituent materials and the sound receiving level in the case of being in a closed state. T (T _{1 to} T _n ) …… Transmission line structure (steel tower), S _{1 to} S _n ……
Sound receiving part, OP ... Optical fiber line, CR ... Remote monitoring part, GW
…… Aerial ground wire position, C _{1 to} C ₃ …… Wire position, SS …… Sound receiving sensor, OPGW …… Aerial ground wire containing optical fiber, MC …… Monitoring center, DS …… Data processing device, DP …… display device, M ...... external memory, PR ...... printer, SP ...... speaker, DI ...... data input means, D ₁ ...... received sound level difference determining means, D ₂ ...... sound receiving position determining means, D ₃ ... ... abnormal sound discrimination means,
1 ... Leg (longitudinal component) 2 ... Connection part, 3 ... Transmission means, 4 ... Horizontal arm, 5 ... Stethoscope, 6 ...
Small microphone, 7 ... Volts.

Front page continued (72) Inventor Minoru Iwatsuki 1 Higashishinmachi, Higashi-ku, Nagoya, Aichi Chubu Electric Power Co., Inc. (72) Inventor Yuji Asano 1-5-1, Kiba, Koto-ku, Tokyo Fujikura Electric Line Co., Ltd. (72) Inventor Tadashi Inoue 1-5-1, Kiba, Koto-ku, Tokyo Fujikura Electric Line Co., Ltd. (72) Inventor Takanori Hita 1-1-5, Kiba, Koto-ku, Tokyo Fujikura Electric Line Co., Ltd. ( 72) Inventor Yasuyuki Shibama 1-5-1 Kiba, Koto-ku, Tokyo Within Fujikura Electric Wire Co., Ltd. (56) Reference JP 62-16017 (JP, A)

Claims (1)

[Claims] 1. A plurality of components are coupled with a sound produced when an abnormal phenomenon generated in a power transmission line network is transmitted to a component forming a structure (T) for a power transmission line. The sound receiving sensors (SS) installed at the separated positions of the components with the connecting portion (2) interposed therebetween detect the sound, and compare the sound receiving levels of the detection signals detected by these sound receiving sensors. A method for detecting an abnormal phenomenon in a transmission line network, characterized in that it is determined that the sound reception level is closer to the position where the abnormal phenomenon occurs.