JPH04138038A - Transmission line supervisory apparatus - Google Patents

Abstract

PURPOSE:To utilize a signal transmission line efficiently by a method wherein a storage means which stores a signal from an output processing means is provided between the output processing means and a signal transmitting means and the signal from the output processing means is not always transmitted to a central control room but is transmitted only when necessary. CONSTITUTION:If a trouble occurs in a transmission line 12, the sensor 16 of a transmission line supervisory apparatus 10 detects a fault current and inputs it to an output processing means 18. A logic signal is outputted from a signal holding circuit which is operated first by the signal inputted to the output processing means 18. That is, if the first cycle of the fault current is positive, the logic output is generated by the signal holding circuit 30 and, if the first cycle is negative, the logic output is generated by the signal holding circuit 30'. A judging circuit 32 judges the direction of the fault current in accordance with the logic signal and recognizes a position where the fault occurs. A fault position indicating signal Si which is generated like this is stored in a corresponding storage means 34.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an improvement of a power transmission line monitoring device that detects the location of an abnormality on a power transmission line [Prior Art] Generally, a power transmission line monitoring device , a sensor installed at each observation point on the power transmission line to detect abnormalities in the power transmission line, an output processing means for processing the output of this sensor, and a signal transmission means for transmitting the signal from this output processing means to a central control room. It is equipped with

The sensor consists of a galvanometer (CT) attached to the overhead ground wire of a power transmission line, for example, and the electrical signal from this galvanometer is
The output processing means converts it into an optical signal and determines the position where the abnormality has occurred, and the signal indicating the position where the abnormality has occurred is transmitted in the form of an optical signal to a central control room, where it is converted into an electrical signal and sent to the power transmission line. are managed to monitor.

[I try to invent or solve! III In the prior art, the signals from the output processing means are constantly transmitted to a central control room and monitored, so that, for example, 0PG
The optical fiber in W will be occupied as a dedicated monitoring line. On the other hand, the amount of information transmitted using 0PGW is gradually increasing, making it difficult to occupy optical fibers for monitoring abnormalities in power transmission lines.

In view of the above, an object of the present invention is to provide a power transmission line that enables effective use of transmission lines by transmitting signals from output processing means as needed, instead of always transmitting them to a central control room. The objective is to provide a monitoring device.

[Means for Solving the Problems 1] In order to solve the above-mentioned problems, the present invention provides a sensor installed at each observation point of a power transmission line to detect an abnormality in the power transmission line, and an output for processing the output of this sensor. In a power transmission line monitoring device comprising a processing means and a signal transmission means for transmitting a signal from the output processing means to a central control room, a signal from the output processing means is stored between the output processing means and the signal transmission means. A power transmission line monitoring device is provided, comprising a storage means, and a signal stored in the storage means is transmitted in response to a command from a central control room.

[Effect]

In this way, instead of always transmitting the signal from the output processing means to the central control room, if the signal is stored in the storage means and the signal is transmitted from the storage means in response to a command from the central control room, the transmission line is usually connected to another It can be effectively used to transmit information, and the central control room can confirm the location of an accident by issuing a command when it knows that an accident has occurred due to relay operation, etc.

[Example] An example of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a power transmission line monitoring device 10 according to the present invention, and this power transmission line monitoring device 10 A plurality of sensors 16 installed at each observation point of the line 14 (see FIG. 2) to detect abnormalities in the power transmission line, an output processing means 18 for processing the outputs of these sensors 16, and this output processing means 18
signal transmission means 2 for transmitting signals from the central control room 22;
0.

The sensor 16 is, for example, a galvanometer (CT) 1 attached to an overhead ground 1114 of the power transmission line 12, as shown in FIG.
It consists of 2A.

For example, as shown in FIG. 3, the output processing means 18 includes two light-emitting ties 24 that are reversely connected to convert the electrical signal from the galvanometer 12A into an optical signal depending on its direction.
．． 24', two light receiving elements 28.28'' which receive optical signals from these light emitting diodes 24 and 24' through optical cables 26 and 26°, and optical signals from these light receiving elements 28.28''. A signal holding circuit 30.30° that outputs a logical output of O/1 when input, and a determination circuit 32 that receives selective output signals from these signal holding circuits 30.30' and determines the direction of the fault current. It consists of. As shown in Figure 4, the fault current 71L (overhead ground wire current) that is immersed in the steel towers located on both sides of the accident location has an opposite phase with respect to the accident location, and therefore the fault current is from this phase. The location of the accident can be determined by determining the polarity of the first cycle. Incidentally, in FIG. 3, reference numeral 31 is a reset circuit.

The power transmission line monitoring device 10 of the present invention includes a storage means 34 between the output processing means 18 and the signal transmission means 20 for storing signals from the output processing means 18, and the signals stored in the storage means 34 are concentrated. The information is transmitted in response to a command from the control room 22.

The central control room 22 includes, for example, a parent central processing unit (parent CP).
tJ) 36, and this parent CPU 36 includes an optical switch 3
8 to signal transmission means 20.

In the illustrated embodiment, the signal transmission means 20 includes an optical image receiving circuit 42 that is installed in the 0PGW and receives optical image signals from an optical image receiving circuit 42 that drives a monitor TV 40 in the central control room 22 and an ITV camera 44 that monitors the power transmission line. Image signal transmission circuit 46
It contains two optical fibers 48.48゛ installed in the dark. One optical fiber 48 is connected to each storage means 34 via an optical splitter 50, and the other optical fiber 48' is connected to each storage means 34 via an optical combiner 52. The optical switch 38 is an optical fiber 48.48
It consists of two switch units 39 and 39' for respectively switching between the parent CPU 36 and the image receiving circuit 42.

Next, the operation of the power transmission line monitoring device 1o of the present invention will be described as follows.
During the daytime, the light switch 38 is turned on as shown by the solid line in FIG.
The ITV camera 44 is connected to an image signal receiving circuit 42 and an image signal transmitting circuit 46 and an ITV camera 44 through an optical fiber 48.
The image signal captured by the ITV camera 44 by controlling the V camera 44 is transmitted from the image transmitting circuit 46 to the optical fiber 48'.
is transmitted to the image receiving circuit 42 via the monitor TV 40.
will be monitored. Note that the optical fiber 48 is connected to the image receiving circuit 4.
Since an optical signal for controlling the image transmitting circuit 46 and the like is transmitted from 2, it enters the storage means 34 through the optical splitter 50, or
Since this optical signal does not match the calling command from the parent CPU 36, no accident information is output from the storage means 34.

On the other hand, when an abnormality occurs in the power transmission line 12, the sensor 16 of the power transmission line monitoring device 10 detects a fault current, and this fault current is input to the output processing means 18. As already mentioned, the signal input to this output processing means 18 is supplied to the signal holding circuit 30.30' via the light emitting tie 24.24'' optical cable 26.26' and the light receiving element 28.28''. Ru. Since the signal holding circuits 30 and 30' mutually input their output signals to the input terminals of the other as operation inhibit inputs, the logic signal from the signal holding circuit that operated first is output.

Therefore, if the first cycle of the fault current is positive, the signal holding circuit 30 generates a logic output, and if the first cycle is negative, the signal holding circuit 30' generates a logic output. The circuit 32 determines the direction of the fault current from this logic output and confirms the location of the fault.

The accident position indication signal Si generated in this way is stored in the corresponding storage means 34.

At night, the light switch 38 or the parent CPO 36 as shown by the dotted line
When switched to the side, the accident information stored in the storage means 34 can be transmitted to the *cpU 36 in the central control room 22 in response to a call command from the IIcPU 36. Therefore, the location of the accident can be confirmed from the central control room 22.

In the above embodiment, the light switch 38 was switched between day and night, but this can be done by providing a detection means in the central control room 22 that can detect the occurrence of an accident by means of a relay that is energized by the operation of one of the sensors 16. Similarly, the accident location signal may be transmitted to the parent CPU 36 of the central control room 22 by manually or automatically switching the optical switch 38 when the detection means is operated. In addition, the data of each observation point may be transmitted to the parent CPU 36 by switching the optical switch 38 when there is heavy rain.

FIG. 5 shows another embodiment of the invention, in which:
Sensor 1 is installed on the overhead ground wire 14 of the branch tower 11 of the power transmission line 12.
6 is attached, and a field unit 54 including an output processing means 18 and a storage means 34 is set at the field. The storage means of the field unit 54 and a central control room (not shown) are connected by telephone line or wirelessly, and accident information stored in the field unit 54 is transferred to the central control room in response to a call command from the central control room. You can collect them.

[Effect of the invention J According to the present invention, as described above, the signal from the output processing means is not always transmitted to the central control room, but is stored in the storage means, and the signal is transmitted from the storage means in response to a command from the central control room. Since a signal indicating the location of an accident is transmitted, the transmission line can normally be used effectively for transmitting other information, and the central control room can be used to troubleshoot accidents by issuing commands as appropriate or when it becomes clear that an accident has occurred. There is a practical benefit to being able to reliably confirm the location of the occurrence.

[Brief explanation of drawings]

FIG. 1 is a schematic system diagram of an embodiment of the power transmission line monitoring device according to the present invention, FIG. 2 is a schematic diagram of a sensor and output processing means, FIG. 3 is a detailed system diagram of the output processing means, and FIG. 4 5 is a line section showing the phase relationship of ground wire currents when an accident occurs, and FIG. 5 is a schematic diagram of another embodiment of the present invention. 10----1 power transmission line monitoring device, 12-1---power transmission line, 14----1 overhead ground wire, 16----sensor,
18-----one output processing means, 20-----one signal transmission means, 22-----intensive control room, 34-----one storage means.

Claims (1)

[Claims] A sensor installed at each observation point of a power transmission line to detect an abnormality in the power transmission line, an output processing means for processing the output of the sensor, and a signal transmission means for transmitting a signal from the output processing means to a central control room. In the power transmission line monitoring device, a storage means for storing a signal from the output processing means is provided between the output processing means and the signal transmission means, and the signal stored in the storage means is stored in accordance with a command from the central control room. A power transmission line monitoring device characterized in that transmission is performed by