JPS593273A - Fault locator apparatus - Google Patents

Abstract

PURPOSE:To make it possible to automatically determine an accurate located distance without carrying out properly required adjustment, by a method wherein the transmission delay time of a signal transmission line is measured and the error of a distance generated from the delay times of a power-transmission line and the signal transmission line is calculated. CONSTITUTION:The titled apparatus is equipped with a modulator 6 for transmitting the reference pulse from a key station apparatus M to a sub-station apparatus S through a power- transmission line L, a modulator 9 for transmitting the reference pulse regenerated by the sub- station S to the key station M and a counter 13 for measuring transmission delay times of reference pulses between both stations from the phase difference of the sent-out reference pulse and the reference pulse transmitted from the sub-station S. To the key station M, a counter 3 for measuring the difference of reference pulse and the receiving time of accident surge induced through a connecting apparatus 1 connected to the power-transmission line L is provided while a counter 11 for measuring the difference of the received reference pulse and an accident surge receiving time induced through a connecting apparatus 2 connected to the power-transmission line L is provided to the sub-station S' and an accurate located distance to an accident point from the key station or the sub-station S' and an accurate located distance to an accident point from the key station or the sub-station is further calculated from the relation of these values and the length L of the power-transmission line in the key station.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to a 7 ortholocator device for locating the point of occurrence of a power transmission line accident such as a ground fault caused by lightning by detecting surge noise.

(b) Prior Art and Problem 7 Although there are several types of ortholocator devices, the P-type fault locator device related to the present invention will be explained using FIGS. 1 to 3.

FIG. 1 is a diagram showing an example of the configuration of a conventional 7 ortholocator device. In the figure, M is a master station device.

8 is a slave station device, 1 and 2 are coupling devices, 3.11 is a counter, 4 is an arithmetic circuit, and 5 is a reference pulse generator.

6.9 is a modulator, 7 and 8 are demodulators, 10 is a reference pulse regenerator, L is a power transmission line, and D and U are transmission lines.

FIGS. 2 and 3 are diagrams of the principle of FIG. 1. Figure 2(a)
If the scanning pulse is between the fault point and the slave station device, the same figure (
b) is when the scanning pulse is between the fault point and the master station device, as shown in Fig. 3 0. (b) shows the case where there is a delay time difference.

In a P-type fault locator, it is necessary to constantly transmit a time reference pulse from the master station device M to the slave station device S, and the transmission delay time must be equal to the time it takes for the surge to propagate between A and B in Figure 1. It's not a big deal.

Under the above conditions, the master station device M and the slave station device ts start the time measurement counters 3 and 11 with a reference pulse, stop them when a surge is received, and hold the measured values.

The measured values in the master station device ~1 and the slave station device S are as shown in FIG. 2, and there are two types.

At the master station device M, the reference pulse is sent to the slave station device, and at the same time, the counter 3 is started and the distance is converted to a(m
) (Equivalent to a/V p seconds after the start.)

1Vp - Signal propagation speed (velocity of light) or less) When counting, if an accident occurs at the point X (Im) from the master station + itM, it will take an additional X (m) count before the surge reaches the master station M. The final callan HiM will be done.
becomes M −a 1X (''). (Surge propagates at the speed of light) On the other hand, in the slave station S, counter 1 is started by the reference pulse that precedes the surge, so as shown in Figure 2 (a)
In the case where the scanning pulse is between the failure point and the slave station device, the count value S of counter 1 is 5=a-
In the case of (b), that is, when the scanning pulse is transmitted between the failure and the master station device, it becomes p-(x-a)(m). Here, P is the distance conversion of the reference pulse period TO. (To・
Vp).

The distance X from the master station position M to the accident point is calculated from the count value M-8 obtained from the above-mentioned numbers using the following formula.

X--(M-El) M S or X-
-(M-9)+T M<S Similarly, the count value S of the counter 1 of the slave station device S is sent to the master station device M via the transmission path U, but has no relation to the delay time.

The P-type fault locator device locates the fault point using the method described above, but the conditions described above are required.

Normally, a carrier line in a micro line is used for transmitting the reference pulse, but the above conditions are not met because a modem is required for the signal transmission 7 and the signal passes through a carrier device.

For this reason, since the reference pulse is a signal with a constant period, a delay circuit is provided in the slave station device S to apparently satisfy the above conditions.

However, it is extremely difficult to prove that the above conditions are met by directly measuring the delay times of the reference pulse and surge.

For this purpose, a fault locator device is actually installed on the power transmission line to be monitored, and operations such as generating an artificial fault at both ends or at a suitable location in the middle, or applying a high voltage impulse to simulate a fault surge are performed. , the final delay correction is made for the difference between the orientation value and the actual distance.

These operations must be performed while the power transmission line is stopped, and are extremely complex.Fourly, if the configuration of the transmission line that transmits the reference pulse is changed, the above tests may be delayed. There were drawbacks such as the need to reset the correction value.

Similarly, if the delay correction is not performed, the count value at the slave station device S will include the difference between the reference pulse delay time and the surge propagation time, for example as shown in FIG. 3, and thus the location value will include an error.

That is, when trying to find the count values M/, B/, and lx of the master station device M and the slave station device S in FIG. 3, x −
-(M-8)-1 knee, "Mataha x-7(M-8)+"
±−L2
4 2 2, which includes the unknown quantity ΔL.

(C) Object of the Invention In order to eliminate the drawbacks of the conventional 7-ortho locator device, an object of the present invention is to provide a fault locator device that automatically corrects the transmission delay time of the reference pulse. It is something.

(d) Object of the Invention In order to achieve the above object, the present invention provides a fault locator device that locates the point of occurrence of a power transmission line by receiving surge noise generated from the fault point of a power transmission line. A master station device is provided at one end and a slave station device is provided at the other end, and the master station device and the slave station device are coupled by a pair of transmission paths with equal round-trip transmission delay times, and from the master station device to the slave station device. a first circuit that transmits a signal with a constant repetition period, and transmits to the master station a signal whose repetition phase matches the signal transmitted and received from the master station apparatus to the slave station apparatus; A second circuit is provided to measure the signal delay time of the transmission path from the phase difference between the signal sent to the slave station device and the signal transmitted and received from the slave station device, and the master station device and the slave station device W is provided with a third circuit that measures the time difference between the transmitted signal and the time when the accident surge propagated through the power transmission line is received, and the master station device is further provided with a coincidence signal from the first circuit. and the second. By providing a circuit that calculates the distance from one end of the transmission line to the point where the accident occurred based on the relationship between the measurement value in the third circuit and the length of the transmission line, it is possible to automatically correct the signal transmission delay time. It is characterized by the following.

(θ) Embodiment of the Invention Hereinafter, an embodiment of the fault locator device of the present invention will be explained in detail with reference to FIG.

FIG. 4 is a diagram showing an example of the configuration of the fault locator device of the present invention. In the figure, the same numbers as in Figure 1 indicate the same circuits, etc. 12 is a reference pulse regenerator;
3 is a counter, 14 is a separation circuit, 15 is a demodulator, and 16 is an M-8 arithmetic circuit.

1γ is an X calculation circuit, 1st is an arithmetic circuit, 19 is a modulator, 2
0 is a multiplex circuit, and DB is a data transmission line.

As shown in FIG. 4, the fault locator device of the present invention includes a modulator 6 that transmits a reference pulse from a master station device M installed at one end of a power transmission line to a slave station device 8 at the other end of the power transmission line. ．． The modulator 9 transmits the reference pulse reproduced by the slave station device S to the master station device M, and the master station device M uses the phase difference between the sent reference pulse and the reference pulse transmitted from the slave station device S to the transmission line U. A counter 13 is provided to measure the transmission delay time of the reference pulse from the master station device M to the slave station device S. Counter 3 for measuring the difference in reception times of accident surges. The slave station LtS is provided with a counter 11 that measures the difference between the received reference pulse and the reception time of the fault surge guided through the coupling device 2 connected to the power transmission line. Measured value (M
, S, D) and the power transmission line length (L), it has an arithmetic circuit 18 that calculates the distance X from the master station or slave station to the accident point.

First, the transmission delay time of the reference pulse and the power line A of the surge
The propagation times from point to point B are generally not equal.

For this reason, if an accident occurs on a power transmission line,
As explained in the figure, the calculation result of the accident point includes an error ΔL. This error is directly equal to the difference between the propagation time for the surge to travel along the power transmission line from point A to point B and the transmission delay time for the reference pulse to travel from the master station device M to the slave station device S, converted into distance. The method for converting into distance is as described above.

On the other hand, the delay time for the reference pulse to be transmitted from the master station device M to the slave station device S is determined by the following procedure.

(In Fig. 4) Since the transmission delay time of the signal transmission path is equal from 1M to S and from S to M, the reference pulse sent by the master station device M and the reference pulse transmitted from the slave station device S to the master station device M It is calculated as 1/2 of the time difference calculated from the phase difference. That is, the transmission delay time is -, -D. Here it is D-U.

Since the length of the power transmission line is known, once the connection 7 in FIG. 3 and the transmission delay time are known, the fault point X can be found using the following equation.

In the case of FIG. 3(a), the distance error ΔL resulting from the delay time between the power transmission line and the signal transmission line is ΔL−μ−L. Here, μ is a value converted into distance from the delay time of the transmission path, and L is the length of the power transmission line.

Therefore, the accident point or △L x--H(M'-8')〒2 becomes.

In addition, in the case of Fig. 3(b), the distance error △L caused by the delay time between the power transmission line and the signal transmission line is △L as described above.
=μ−L.

Therefore, the accident point X is △L x --; (M'-8'10P)〒.

becomes.

As described above, the transmission delay time of the signal transmission line was automatically measured, the error △L was found, and the equation for calculating the fault point was derived. The correct orientation distance can be automatically obtained without any adjustment.

(f) Effects of the Invention As explained in detail above, according to the 7 ortholocator device of the present invention, the transmission delay time of the signal transmission line is automatically measured and the delay time of the power transmission line and the signal transmission line is calculated. By determining the resulting distance error, it is possible to automatically obtain the correct orientation distance without making any adjustments that were previously required.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of the configuration of a conventional 7 ortholocator device, and FIGS. 2 and 3 are diagrams of the principle of FIG. 1. FIG. 4 is a diagram showing an example of the configuration of the 7 ortholocator device of the present invention. In the figure, M is a master station device, S is a slave station device, 1.2 is a coupling device, 3, 11.13 is a counter, 4 is an arithmetic circuit, and 5
is a reference pulse generator, 6,9°19 is a modulator, 7,8.
15 is a demodulator, 1o; 12 is a reference pulse regenerator, L is a power transmission line, D and U are transmission lines, 14 is a separation circuit, and 16 is an M-8 arithmetic circuit. 17 is an X calculation circuit, 1B is an arithmetic circuit, 20 is a multiplex circuit,
DB is a data transmission path. Figure 1 (a (I)) Figure 2

Claims (1)

[Claims] In a fault locator device that locates the point of transmission line fault by receiving surge noise generated from the fault point,
A master station device and a slave station device are provided at one end of the monitored power transmission line and a slave station device at the other end, the master station device and the slave station device are coupled by a pair of transmission paths having equal round-trip transmission delay times, and the master station device A first circuit is provided for transmitting a signal with a constant repetition period from the slave station device to the slave station device, and transmitting to the master station a signal whose phase repeatedly matches the signal transmitted and received from the master station device to the slave station device. , a second circuit is provided in the master station device to measure the signal delay time of the transmission path from the phase difference between the signal sent to the slave station device and the signal transmitted and received from the slave station device; A third circuit is provided in the device and the slave station device to measure the time difference between the transmitted signal and the time when the accident surge propagated through the power transmission line is received, and the master station device is further provided with a third circuit that measures the time difference between the transmitted signal and the time when the accident surge propagated through the power transmission line is received, and the master station device further measures the time difference from the first circuit. signal as well as the second. By providing a circuit that calculates the distance from one end of the power transmission line to the accident point based on the relationship between the measured value in the third circuit and the length of the power transmission line, the signal transmission delay time can be automatically corrected. A 7 ortholocator device characterized by: