JPS62105060A - Locating method for cable accident section - Google Patents

Abstract

PURPOSE:To detect an accident at any time and to locate its section through a simple constitution by laying an address setting line and a data detection line along cable position detection places and applying an address setting signal which has a time difference to the address setting line. CONSTITUTION:Address setting lines A.L(A-L1-A.L4) and a data detection line D.L(lines 21-23) are laid along the position detection places, and the address setting lines A.L are connected to the data detection line D.L through sensors 1A-3A, 1B-3B, and 1C-3C provided at the respective position detection places corresponding to those sensors. Then, address setting signals S1-S4 are applied to the address setting lines A.L through transistor gates G1-G4 while having a time difference. Further, a voltage V is applied to the data detection line D.L through a resistance R. Then, the accident section is spotted by detecting the fall of the line level of the data detection line D.L from the voltage V to 0V due to the operation of the sensors.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a cable accident area locating method, and more particularly to an accident area locating method that is capable of constantly detecting the occurrence of an accident and locating the area.

[Technical Background of the Invention and Problems Therein] If the accident point can be automatically located using a device permanently installed on the cable track, the accident point can be immediately discovered and appropriate measures can be taken. Various methods have been developed to achieve this goal, but these methods have the disadvantage that although it is possible to confirm that an accident has occurred, the location of the accident cannot be determined, or that the number of wire cores is large. For example, the detection method shown in FIG. 3 includes a plurality of sensors 301 along the cable line! ! - the sensors 30 are divided into, for example, two groups, and each group is connected to the original set of conductors 40 and connected to the detector 20. In this detection method, the sensors 30 are The configuration is simple, but the sensor 3 is connected to the same conductor = 10.
If two or more 0's are activated, its position cannot be determined.

In addition, in order to have a single position detection function in this production method, the number of conducting wires must be set to [number of detection positions + common line 1
book]. On the other hand, in the method shown in FIG. 4, three conductive wires 40 are arranged, and two of them are sequentially selected in combination and connected to the sensor 30. Although this method requires fewer conductive wires, the sensor 30 Requires complex functionality to select and scan combinations. Moreover, 1 for example 4th
When two of the three sensors 30 operate as shown in the figure.

Both ends of an inactive sensor are also conductive, making position detection virtually impossible.

[Purpose of the Invention] The present invention has been made in order to solve the above-mentioned problems of the conventional technology. .

[Summary of the Invention] In order to achieve the above object, according to the accident area locating method of the present invention, address setting lines and data detection lines are laid along a plurality of cable position detection points, and is equipped with a sensor to detect cable accidents.
passing the address setting line through a sensor provided at the detection location and connecting it to the data detection line via the sensor;
The accident section is located by applying address setting signals to the address setting lines at different times and detecting the line level of the data detection line.

[Embodiments of the invention] Preferred embodiments of the present invention will be described below with reference to the drawings.

In Fig. 1, address setting lines A, L and data detection line L are laid along position detection points of a cable (not shown), and sensors IA and 2A are installed at each position detection point to detect cable accidents. , 3A... are installed. As shown in FIG. 2, for example, the section A between the manholes 20
There is a sensor IA.

2A, 3A, B has IB, 2B, 3B, C has IC.
-2C13C are installed at equal intervals.

Address setting lines AL are connected to sensors IA, 2A, 3A, IB, 2B, 3B, and IC12 provided at the position detection locations, respectively.
a data detection line via the sensor corresponding to C13C;
Connected to L. For example, the address setting lines A, L4 are data detection lines, L lines 2], 22. 23.

Note that a voltage V is applied to each data detection line L via a resistor R. Also, the address setting signals s1+s2. S-i.

Sl is applied to address setting lines A, 11-4 via transistor gates a, , a, , G3°G4. That is,
The signal is input to the base of each gate, each collector is connected to its respective address setting, and the emitter is grounded. The sensor is a sensor or an optical sensor for detecting an accident in the cable, and is of the type that closes the contact indicated by the dotted line in response to the detection of an accident.

Now, when an accident occurs in a part of the cable and a sensor (for example, IA) near the occurrence point is activated, the address setting signal S input at the timing shown in Fig. 1 opens the gate G4, and the voltage V is applied to the resistor. Gate 1 through R and sensor IA.
~Falls from G4 to earth and becomes ■=O. At the end of the tree is the data detection line.

By detecting that the line level has changed from ■ to O volts from line 2 of L, it is estimated that the cable accident is in section A. Even when an accident is detected by other sensors, the position can be determined in the same way, so the explanation thereof will be omitted.

[Effects of the Invention] As is clear from the above embodiments, in the accident area locating method of the present invention, an address setting line and a data detection line are laid along the cable position detection point, and the address setting line has a time-shifted address. By applying settings, it becomes possible to detect accidents and locate sections.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a circuit diagram of the detection device used in the present invention, Fig. 2 is an explanatory diagram of the setting position of the sensor used in the present invention, and Figs. 3 and 4 are respectively the conventional They are a system configuration diagram and a circuit diagram in the accident area location method. A, L... Address setting line, L...
・・・・・・Data detection lines 81 to S, ・・・Address setting signal Agent Patent attorney Moritani -O Figure 1 2B Figure 2

Claims (1)

[Claims] An address setting line and a data detection line are laid along a plurality of cable position detection points, and a sensor for detecting a cable accident is provided at the detection point, and the address setting line corresponds to the sensor provided at the detection point. and connects to the data detection line via the sensor, applies an address setting signal to the address setting line at different times, and detects the line level of the data detection line to locate the accident area. Cable accident area location method.