JPH0315990B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power transmission line failure location detection device for accurately detecting the location from a distance when a power transmission line accident occurs due to a lightning strike or the like.

In FIG. 1, which shows an example of a conventional power transmission line fault location detection device that observes the waveform of a propagated surge through a power transmission line phase conductor, 1 is a power transmission line, 2 is a PD,
3 is a surge wave detector, 4 is a transmitter, 5 is a micro carrier end, 6 is a receiver, and 7 is a counter.

In the device shown in Fig. 1, when a failure occurs in the power transmission line 1, the surge waveform caused by this failure is
The signal is input to the waveform detection device 3 via PDs 2 provided at both ends of the monitoring section. Detection of this fault surge triggers the transmitter 4 and the receiver 6, respectively, and the transmitter 4 sends a signal to the receiver 6 via the microcarrier end 5. On the receiver 6 side, the counter 7 is started when triggered and stopped when the signal from the transmitter 4 is received. Since the count value of the counter 7 indicates the time difference between when the surge arrived at both ends of the monitoring section from the failure point, the distance to the failure point is calculated from this time difference.

Since the conventional power transmission line fault location detection device is configured as described above, the distance must be calculated from the surge propagation time, which has the disadvantage that the fault location can be determined inaccurately.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and uses a failure detection indicator installed on each tower separately from the power transmission line fault locator to indicate the operating status of the transmission line. It is an object of the present invention to provide a power transmission line fault location detection device that is configured to be able to monitor from a distance, thereby making it possible to accurately calculate the fault point.

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 2, reference numeral 1 indicates a power transmission line, and reference numeral 21 indicates a steel tower that supports the power transmission line 1. A power transmission line failure detector 22 installed on each tower 21 is connected to an optical fiber 23 connected to an overhead ground wire. and is connected to the optical fiber ortholocator 24.

As shown in FIG. 3, each power transmission line fault detector 22
consists of an optical fiber cutter 31, an optical fiber surplus storage section 32, and a power transmission line failure detection section 33.

When a failure occurs in the power transmission line 1, among the transmission line failure detectors 22 installed in each tower 21, the transmission line failure detection unit 33 of the one closest to the failure point operates,
By interlocking the optical fiber cutter 31,
The optical path of the optical fiber 23 is cut off. Since each power line fault detector 22 is monitored by an optical fiber ortholocator 24 via an optical fiber 23,
When the optical fiber cutter 31 of one power transmission line failure detector 22 cuts off the optical path, the position of this power transmission line failure detector 22, that is, the position of the failure point can be accurately located. Note that the cut optical fiber 23 is restored by splicing or the like when inspecting the power transmission line, and the optical fiber required at this time is supplied from the optical fiber surplus storage section 32. Also,
The optical fiber disconnector 31 and the power transmission line failure detection unit 33 are also restored at the same time.

Furthermore, by using a portable optical fiber ortholocator when inspecting power transmission lines, it is easy to find out whether or not there is a fault point beyond the initially detected fault point, and if there is a fault point, its location. be able to.

In the above embodiment, the optical fiber is combined with the overhead ground wire, but the optical fiber may be combined with the phase conductor, or may be laid alone.

As described above, according to the present invention, each power transmission line fault detector installed on a transmission line tower is connected to an optical fiber fault locator via an optical fiber. This has the advantage that points can be detected accurately.

Furthermore, since the power transmission line failure detector installed on the steel tower has a simple configuration, the system can be configured at low cost.

Furthermore, since there is little loss of optical power within the power transmission line fault detector, there is an advantage that fault location of long distance power transmission lines is possible.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a conventional power transmission line fault location detection device, FIG. 2 is a block diagram showing the configuration of a power transmission line fault location detection device according to an embodiment of the present invention, and FIG. FIG. 2 is a block diagram showing the configuration of a power transmission line fault detector used in the device of FIG. 1... Power transmission line, 21... Steel tower, 22... Transmission line failure detector, 23... Optical fiber, 24... Optical fiber ortholocator, 31... Optical fiber cutter, 32... Optical fiber extra length Storage section, 33...
Transmission line failure detection unit. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A power transmission line fault detector installed on each tower supporting the power transmission line to detect a fault in a predetermined monitoring section;
Each power transmission line fault detector is connected via an optical fiber, and includes an optical fiber ortholocator that locates a fault location using an optical signal from each of the power transmission line fault detectors, and the power transmission line fault detector is connected to the a power transmission line failure detection unit that detects that a failure has occurred in the power transmission line; and a means for cutting the optical path of the optical fiber in response to an output signal when the transmission line failure detection unit detects a failure in the power transmission line. A power transmission line failure position detection device comprising: an extra length storage section for performing splicing connections multiple times during restoration.