JPH0228105B2 - HIKARIFUAIBAFUKUGOKAKUCHISENRYOJIKOTETSUTOSHIKIBETSUHOSHIKI - Google Patents

Description

[Detailed Description of the Invention] Technical Field of the Invention The present invention relates to an accidental tower identification method that is economical and capable of identifying a steel tower where an accident has occurred, and that uses an optical fiber composite overhead ground wire as a transmission line. It is.

Prior Art and Problems Accidents such as ground faults may occur in steel towers that support power transmission lines due to an increase in ground potential due to lightning strikes. In such a case, it is necessary to quickly detect the steel tower where the accident occurred from the standpoint of safety, maintenance, etc., and for this reason, the conventional method is as shown in FIG. 1, for example. In the figure, 1 to 3 are steel towers that support power transmission lines (not shown), 4 is an overhead ground wire supported by towers 1 to 3, and 5A, 5B, 6A, 6
B, 7A, and 7B are sensors that detect the phase of the fault current flowing through the overhead ground wire 4 at the time of an accident.
A pair is provided for each of ~3. Also, 8
-10 are determination circuits provided corresponding to each of the steel towers 1 to 3, and the detection results of the sensors corresponding to each of the steel towers 1 to 3 are added. Then, when the detection results added from the pair of sensors corresponding to each tower are in reverse phase, the determination circuits 8 to 10 determine that an accident has occurred in the towers 1 to 3, and set the output signals a to c to "1", and output signals a to c as "1". If they are in phase, it is assumed that no accident has occurred in the steel towers 1 to 3, and the output signals a to c are set to "0".

For example, if a ground fault occurs in the steel tower 2, the direction of the fault current flowing through the overhead ground wire 4 will be as shown by the arrow in the figure, so the detection results of the sensors 5A and 5B and the detection results of the sensors 7A and 7B will be The detection results will be in phase, and the detection results of sensors 6A and 6B will be in opposite phase. Therefore, the output signals a and c of the determination circuits 8 and 10 are "0", and the output signal b of the determination circuit 9 is "1".
becomes. Therefore, at terminal stations etc.
By monitoring the output signals a to c of the determination circuits 8 to 10, it is possible to detect that an accident has occurred on the steel tower 2 at the same time as the accident has occurred.

However, in the conventional example described above, a pair of sensors must be provided for each steel tower, which has the disadvantage of increasing equipment costs.

OBJECTS OF THE INVENTION The present invention has been made to improve the above-mentioned drawbacks, and its purpose is to make it possible to detect a steel tower where an accident has occurred with an economical configuration. Examples will be described in detail below.

Embodiment of the invention FIG. 2 is a configuration diagram of an embodiment of the invention, and 11
~14 is a steel tower, 15 is an optical fiber composite overhead ground wire with built-in optical fiber 16, 17A, 17
B, 18A, 18B are sensors for detecting the phase of the fault current flowing through the optical fiber composite overhead ground wire 15 in the event of an accident, and a pair of sensors 17 correspond to the steel tower 11.
A, 17B are provided, and a pair of sensors 18A, 18B are provided corresponding to the steel tower 14. Further, 19 to 24 are electro-optical converters, 25 to 30 are photoelectric converters, and 31 to 34 are judgment circuits having the same functions as the judgment circuits 8 to 10 shown in FIG.

For example, if a ground fault occurs in the steel tower 12, the direction of the fault current flowing through the overhead ground wire will be the direction indicated by the solid arrow in the figure. Therefore, the detection result is applied to the determination circuit 33 from the sensor 17B via the electro-optic converter 21, the optical fiber 16, and the photo-electric converter 28, and the detection result is applied from the sensor 18A to the electro-optic converter 2.
2. The detection results applied via the photoelectric converter 29 have opposite phases, and the detection results applied from the sensor 18A and the detection result applied from the sensor 18B to the determination circuit 34 are applied via the electro-optical converter 23 and the photo-electric converter 30. The detection result is the same phase. Further, the detection result applied from the sensor 17A to the determination circuit 32 and the sensor 1
The detection result applied from the sensor 17A to the determination circuit 31 is in phase with the judgment result applied from the sensor 7B, and the detection result applied from the sensor 17A to the judgment circuit 31 is sent to the electric-optical converter and the optical fiber 15 from a sensor (not shown) corresponding to the steel tower at a certain distance from the steel tower 11. , the detection results applied via the photoelectric converter 25 are in phase. Therefore, if an accident occurs in the steel tower 12, the output signals a, b, d of the determination circuits 31, 32, 34 will be "0", and the output signal b of the determination circuit 33 will be "1", so each A terminal station with a communication function located under the steel tower where the sensor is installed transmits it to the master station via an optical composite overhead ground wire, and the master station monitors the output signals a to d of each determination circuit 31 to 34. , it is possible to detect that an accident has occurred on the steel tower 12 at the same time as the accident occurs.

Furthermore, in the event that a ground fault occurs in the steel tower 11, the detection results of the sensors 17A and 17B will be in reverse phase, and the detection results of the sensors 17B, 18A, 18B
Since the detection results of are in phase, the output signal b of the determination circuit 32 is "1", and the output signals a, c, d of the determination circuits 31, 33, and 34 are "0". Therefore, each determination circuit in the master station 31 to 34 output signals a to d
By monitoring tower 1 as soon as an accident occurs,
1, it is possible to detect that an accident has occurred.

In the embodiment, the sensors are provided at intervals of one pylon, but it goes without saying that the sensors may be provided at intervals of two or more pylons. However, if sensors are installed at intervals of two or more towers, it is not possible to detect which tower the accident occurred on, but it is possible to detect the section that includes the tower where the accident occurred.

Effects of the Invention As explained above, in the present invention, at least one pair of sensors is provided for every other steel tower, so the number of sensors is reduced compared to the conventional system in which one pair of sensors is provided for each steel tower. Therefore, there is an advantage that a steel tower where an accident has occurred can be detected with an economical configuration.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a conventional example, and FIG. 2 is a block diagram of an embodiment of the present invention. 1-3, 11-14 are steel towers, 4 is an overhead ground wire, 5
A, 5B, 6A, 6B, 7A, 7B, 17A, 1
7B, 18A, 18B are sensors, 8 to 10, 31
-34 are determination circuits, 15 is an optical fiber composite overhead ground wire, 16 is an optical fiber, 19-24 are electro-optic converters, and 25-30 are photo-electric converters.

Claims (1)

[Claims] 1. In the accident tower identification method that detects the tower where the accident occurred based on the phase of the fault current flowing through the overhead ground wire supported by the tower supporting the power transmission line,
A pair of sensors for detecting the phase of the fault current flowing through the overhead ground wire are installed in a steel tower separated by a certain section, one pair for each tower, and a pair of sensors installed for each tower, and another sensor installed in another tower adjacent to the sensor. Detects the steel tower where the accident occurred or the section including the steel tower where the accident occurred based on the detection results of the sensor,
A method for identifying accident towers using optical fiber composite overhead ground wires, which is characterized by transmitting information using optical composite overhead ground wires.