JP2504379B2 - Fault location device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fault point locating device having a branch point and monitoring a transmission line extending over a plurality of electric stations.

[0002]

2. Description of the Related Art In recent years, with the increase in power demand and the increase in complexity,
Multi-branching of power supply and transmission lines is progressing. In the conventional fault point locating device using pulse radar waves, from the sending end that sends the pulse radar waves (locating waves) to the target transmission line,
Although accident points are discriminated by reflected waves, the number of branching of the transmission line as described above increases the error at the accident points due to superposition of reflected waveforms, which is at the limit.

FIG. 3 shows a conventional fault point locating system configuration of a transmission line. Here, 41 to 43 are electric power stations (substations, etc.), 44 is a power transmission line, 45 is its branch line, 4
6 is a branch point, 47 is an accident point, and 48 is a standardized wave transmitting / receiving device.

4 (a) and 4 (b) are orientation waveform diagrams.
FIG. 4A is an orientation waveform diagram for normal times, and FIG. 4B is an orientation waveform diagram for an accident. In these figures, 51 is a transmitted wave and 5
2 is a branched reflected wave (reflected wave from the branch point 56), 53 is a branched end reflected wave (reflected wave from the terminal at the electric station 43), 54 is a terminal reflected wave (reflected wave from the terminal at the electric station 42), 55 is a reflected wave at the accident point.

The above-mentioned items are from the electric power station 41 to the electric power station 42.
To the electric power station 41, at the branch point 46, and at the branch point 46.
As shown in FIG. 4A, the received waveform at the device 48 that sends and receives the standardized wave from the reflected wave is reflected from the impedance displacement point such as the outgoing wave branch point 46 as shown in FIG. 4A. The pulsed radar wave is AC
Although it is a waveform, here, it is simplified to be a half-wave waveform. Further, as shown in FIG. 4B, the waveform at the time of occurrence of a failure point is shown.

However, in the above-mentioned one, when an accident (ground fault etc.) occurs at the accident point 47 of the power transmission line 44,
The received waveform of the device 48 changes as shown in FIG. 4B, and the branch end waveform 53 and the accident point reflection waveform 55 are superposed, which has a drawback that the accident point is ambiguous. Further, in the case of an accident that overlaps with the end of the branch (an accident near the end of the branch), the position of the reflected waveform does not change and there is a slight change in the reflected level by the conventional method, but it is difficult to distinguish it.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has a fault point locating device which improves the accuracy of detecting an accident point and can easily discriminate an accident occurring near an electric station. Is to provide.

[0008]

DISCLOSURE OF THE INVENTION The present invention relates to a fault point locating device having a branch point and monitoring a transmission line extending over a plurality of electric stations, and a pulse provided at each electric station connected to the transmission line. A radar wave receiving device, and a pulse radar wave transmitting device selectively provided at the electric station,
A pulse radar wave transmitted from the transmission device to the power transmission line and a reflected wave thereof, the determination device determining a fault point of the power transmission line according to a result received by the reception device. It is a fault point locating device.

That is, the present invention, like the conventional one,
It is designed to eliminate the drawbacks that occur when the standard wave is sent from one end of the monitored power line and the reflected wave of the standard wave is received.A receiving device that receives the standard wave is provided at each end of the power line. By detecting the standardized wave at each of the electric power stations located in, the transmitted wave (transmitted wave) sent from the sending end and the reflected wave reflected from the impedance displacement point of the transmission line are detected. , The location accuracy of the accident point can be improved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of the embodiment. Since the present embodiment is an example of a case corresponding to the above-mentioned conventional one, the same reference numerals are used for corresponding portions. That is, as shown in FIG. 1, the transmission line 4 extending from the electric station 41 to the electric station 42.
4 and a branch line 45 connecting the electric station 43, and as a system for monitoring this power transmission line, a parent device (standard wave transmitting / receiving end processing device) 61 for transmitting and receiving standard waves and processing data is installed. Electrical station 41, receiver 6 for standardized wave
There are electric stations 42 and 43 in which 2, 63 are installed, and a data transmission path 64 connecting the parent device and each receiving device 62, 63,
It is composed of 65.

FIG. 2 is an operation waveform diagram of FIG. 1 and is shown in FIG.
Is the transmission standard wave 71 and the reception standard waves 72 to 7 of the electric station 41.
2 is shown in FIG. 2 (b).
73, and FIG. 2 (c) shows the reception standard wave 7 of the electric station 43.
6, 74. These FIG. 2 (a) to FIG. 2 (c) are waveforms at the time of normality without an accident. The orientation waves at the time of the accident are as shown in FIGS. 2 (d) to 2 (f). FIG. 2 (d) shows the waveform of the electric station 41, FIG. 2 (e) shows the waveform of the electric station 42, and FIG. 2 (f) shows the electric station. 43 is a waveform.

Here, the waveform 72 is a branch point reflection waveform, and the waveform 7
3 is a branch end reflection waveform, waveform 74 is a termination reflection waveform from the electric station 42, waveform 75 is a transmitted wave received at the electric station 42,
A waveform 76 indicates a transmitted wave received at the electric station 43, a waveform 77 indicates an accident point reflection waveform, 78 indicates a distance between the electric station 42 and the accident point 47, and 79 indicates a traveling direction of the orientation wave.

Next, the operation of FIG. 1 will be described with reference to FIG. 2 as needed. First, when the power transmission lines 44 and 45 are normal (when there is no accident point 47), when the standard wave 71 is transmitted from the parent device 61 of the electric station 41, this advances along the power transmission line 44 and first reaches the branch point 46. Upon arrival, the transmission line 44 branches here and the impedances are different. Therefore, as in the traveling direction 79, a part is reflected to be a branch point reflection. In addition, a part of the power station 4
2 and 43 are transmitted to the electric power stations 42 and 43 and are received by the receivers 62 and 63, and a part of them are reflected, and further transmitted and reflected at the branch point 46 as described above. Part of the data is received by the parent device 61, and the electric station 4
It is also received at 2, 43.

2A shows the reflected waveform received at the electric station 41, while FIGS. 2B and 2C show the electric stations 42 and 43.
, Which is a waveform that is not received in the conventional system. Here, the waveforms 75 and 76 are orientation waves that have arrived directly from the power station 41 to the power stations 42 and 43,
This is called a transmitted wave, and it is a branch point or terminal (electric station),
The waveform reflected at the accident point is called a reflected wave and will be distinguished.

An electric station 4 corresponding to FIGS. 2 (b) and 2 (c)
In the received waveforms of Nos. 2 and 43, there are reflected waveforms of other electric stations after the transmitted waves 75 and 76. Further, the point where there is no reflected waveform 72 at the branch point 46 (actually, although there is a little, because the transmission and reflection are repeated at the electrical station and the branch point, the level is too small to be seen) is the received waveform at the electrical station 41. It is a different point. Further, the waveform positions are different between the electric stations 42 and 43 (for example, between the transmission waveforms 75 and 76, or the reflection waveform 73).
This is because the distance between the electric stations 41 and 42 and the distance between the electric stations 41 and 42 are different from each other. In terms of the transmitted waveforms 75 and 76, the power station 43 is more
It shows that it is close to 1. Further, the position of the reflected waveform is different because the distance between the electric stations 42 and 43 is constant, but the distance between the electric station 41 and the electric stations 42 and 43 is different from each other. Is represented as.

That is, the position of the transmitted wave is determined by the distance between the electric station 1 (transmission end) and the receiving electric station, and the reflection wave is the reflection point (electrical station, accident point, etc.) where the reflected waveform occurs and the transmission end. The position is determined by the distance between and and the distance between the reflection point and the receiving end.

Assuming now that an accident has occurred at point 47 on the power transmission line 44, the received waveforms at each of the electric stations 41 to 43 are as shown in FIG.
(D) to FIG. 2 (f), and in the received waveform of the electric station 41 shown in FIG. 2 (d), the branch end waveform 73 and the reflected waveform 77 of the accident point 47 are superposed, and an accident occurs. The dots are vague.

On the other hand, in the received waveform of the electric station 42 shown in FIG. 2E, the transmitted wave 75 is slightly received by other-phase induction, but in FIGS. Compared to the normal time shown, it indicates that it is not directly received. This is because the wave transmitted from the electric station 41 is absorbed at the accident point 47.

From this, it can be seen that an accident has occurred in the power transmission line 44 between the electric power stations 41 and 42. And
The received waveform of the electric station 43 shown in FIG.
As compared with the received waveform at the normal time shown in (c), the position of the reflected waveform (77) is different, and it is as if the electric station 42 has moved. It shows that there is an accident point 47 near the reflection waveform point at the place 42. Moreover, FIG. 2 (d)
While the accident point waveform 77 of is superimposed on the waveform 73,
In the received waveform of the electric station 43 shown in FIG. 2 (f), it can be seen that the accident point position 47 can be easily determined because the accident point waveform 77 exists independently. That is, waveform 7
Since the distance 78 between 7 and 74 corresponds to the distance between the accident point 47 and the electric station 42, the distance 78 from the electric station 42 is calculated by calculating the distance 78 by the processing device 61. You can see if it is.

As described above, (a) the sound section and the accident section are separated by the transmitted wave received at each electric station.
(B) The distance of the accident point is determined by the received waveform of the electric station in the sound section closest to the section where the accident is occurring.

In this way, when there is an accident point near the electric station, the accident section can be specified by the transmitted wave even if the level change of the waveform is minute, so that the accident point can be identified. .

The present invention is not limited to the above embodiment, but various applications are possible. For example, in the embodiment, the location wave is transmitted from the electric station 41, but the location where the location wave is transmitted may be determined by the power transmission line to be monitored. Further, it is possible to discriminate a more complicated fault point of the transmission line by providing a plurality of points for transmitting the orientation waves.

[0023]

As described above, according to the present invention, it is possible to easily detect a fault point of a multi-branch transmission line in which waveforms are easily superposed by the conventional method without causing superposition of waveforms. In addition, an accident that occurs near the electric station can be easily identified.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a timing waveform chart showing the operation of the same configuration.

FIG. 3 is a configuration diagram showing a conventional fault point locating device.

FIG. 4 is a timing waveform chart showing the operation of the same configuration.

[Explanation of symbols]

41 to 43 ... Electric power station, 44, 45 ... Power transmission line, 46 ... Branch point, 47 ... Failure (ground fault) point, 61 ... Parent device (standard wave transmission, receiving end processing device), 62, 63 ... Standard wave reception apparatus,
64, 65 ... Transmission lines.

Claims (1)

(57) [Claims] 1. A fault point locating device having a branch point and monitoring a transmission line extending over a plurality of electric stations, and a pulse radar wave receiving device provided at each electric station connected to the transmission line, and the electric station. A pulse radar wave transmission device selectively provided in the transmission line, a pulse radar wave transmitted from the transmission device to the power transmission line and a reflected wave thereof, depending on the result received by the reception device, A fault point locating device comprising: a discriminating means for discriminating points.