WO2020044398A1 - Fault point locating device and fault point locating method - Google Patents

Abstract

This fault point locating device is configured to be provided with: a first surge detection unit (20) that is connected at one end to a first point (11) in a transmission line (1) and that detects a surge signal when the surge signal is generated due to damaging of the transmission line (1), in synchronization with a transmission signal flowing through the first point (11); a second surge detection unit (30) that is connected at one end to a second point (12), different from the first point (11), in the transmission line (1) and that detects a surge signal in synchronization with a transmission signal flowing through the second point (12); and a fault point calculation unit (40) that calculates a fault point (13) indicating a damaged position of the transmission line (1) on the basis of the surge signal detected by the first surge detection unit (20) and the surge signal detected by the second surge detection unit (30).

Description

Accident point location device and accident point location method

The present invention relates to an accident point locating device and an accident point locating method for calculating an accident point which is a damaged position of a transmission line.

The accident point locating device is a device that calculates an accident point, which is a damaged position of a transmission line, when the transmission line is damaged.
In Patent Literature 1 below, a master station and a slave station are connected to a transmission line. A transmission line fault point locating method for locating an accident point based on the obtained voltage information and the voltage information on the A-end side is disclosed.
The master station and the slave station are connected via a communication line different from the transmission line, and the slave station transmits voltage information on the B-end side of the transmission line to the master station via the communication line. .

JP-A-9-166640

In the transmission line fault point locating method disclosed in Patent Literature 1, a slave station transmits voltage information on the B end side to a master station via a communication line.
The voltage information at the B end receives a transmission delay in a communication line before being transmitted from the slave station to the master station, and also receives a transmission processing delay in a modem of the slave station that transmits the voltage information, The modem of the master station receiving the voltage information receives a reception processing delay.
Therefore, even if the master station locates the fault point based on the voltage information transmitted from the slave station and the voltage information on the A-end side, the influence of the delay received on the voltage information on the B-end side, There was a problem that it was not possible to accurately locate the accident point.

The present invention has been made to solve the above-described problems, and an accident point locating device and an accident point locating apparatus capable of calculating an accident point of a transmission line without transmitting and receiving voltage information and the like via a communication line. The aim is to obtain a point location method.

An accident point locating device according to the present invention has one end connected to a first point in a transmission line that transmits power as a transmission signal, and generates a first signal when a surge signal is generated due to damage to the transmission line. A first surge detection unit for detecting a surge signal in synchronization with a transmission signal flowing through the point, and one end connected to a second point different from the first point on the transmission line; A second surge detector for detecting a surge signal in synchronization with a transmission signal flowing through the first and second surge detectors; a surge signal detected by the first surge detector; and a surge signal detected by the second surge detector. And an accident point calculation unit for calculating an accident point which is a damaged position of the transmission line.

According to the present invention, it is possible to calculate the fault point of the transmission line without transmitting and receiving voltage information and the like via the communication line.

1 is a configuration diagram illustrating an accident point locating device according to Embodiment 1. FIG. FIG. 3 is a configuration diagram illustrating a first signal separation unit 21 of the accident point locating device according to Embodiment 1. FIG. 3 is a configuration diagram illustrating a second signal separation unit 31 of the accident point locating device according to Embodiment 1. FIG. 2 is a configuration diagram illustrating an accident point calculation unit 40 of the accident point locating device according to Embodiment 1. It is a flowchart which shows the accident point locating method which is a processing procedure of the accident point locating device shown in FIG. It is a block diagram which shows the accident point locating device which concerns on Embodiment 2. FIG. 9 is a configuration diagram illustrating an accident point calculation unit 80 of the accident point location device according to the second embodiment. FIG. 4 is an explanatory diagram illustrating signals handled by a first surge detection unit 20. FIG. 4 is an explanatory diagram showing signals handled by a second surge detector 30. It is a block diagram which shows the accident point locating device which concerns on Embodiment 3. FIG. 10 is a configuration diagram illustrating a first synchronization signal generation unit 103 of the accident point locating device according to Embodiment 3. FIG. 13 is a configuration diagram illustrating a second synchronization signal generation unit 113 of the accident point locating device according to Embodiment 3.

Hereafter, in order to explain this invention in greater detail, the preferred embodiments of the present invention will be described with reference to the accompanying drawings.

Embodiment 1 FIG.
FIG. 1 is a configuration diagram showing the accident point locating device according to the first embodiment.
In Figure 1, the transmission line 1 is a one line, transmitting power as the transmission signal S _p.
In the fault point locating system shown in FIG. 1, the transmission signal S _p is flowing in a direction from the first point 11 to a second point 12.
In the accident point locating device shown in FIG. 1, it is assumed that damage to the transmission line 1 is only a part of damage and is not cut. Thus, even if damage to the transmission line 1, the transmission of the transmission signal S _p in transmission lines 1 shall be continued.

The first point 11 is a point where the input terminal 20a (one end) of the first surge detection unit 20 is connected to the transmission line 1.
The second point 12 is a point where the input terminal 30a (one end) of the second surge detector 30 is connected to the transmission line 1 and is different from the first point 11.
The accident point 13 is a position where the transmission line 1 is damaged, and is between the first point 11 and the second point 12.
Surge signal S _s which is generated by damage to the transmission line 1, flows from the fault point 13 in a direction towards the first point 11, also flows from the fault point 13 in a direction toward the second point 12.
Hereinafter, of the surge signals S _s , the surge signal flowing in the direction from the accident point 13 to the first point 11 is referred to as S _{s_a,} and the surge signal flowing in the direction from the accident point 13 to the second point 12 is S _{s_b.} Called.
Surge signal _{S s_a,} the frequency of the _{S S_B} shall be greater than the frequency of the transmission signal _{S p.}

The first surge detector 20 includes a first signal separator 21, a first synchronization signal generator 22, and a first converter 23.
In the first surge detector 20, the input terminal 20a is connected to the first point 11, and the output terminal 20b is connected to the first input terminal 40a of the fault point calculator 40.
The first surge detector 20, when a surge signal S _s by damage to the transmission line 1 is generated occurs in synchronization with the transmission signal S _p flowing through the first point 11, the surge signal S _{s_a} To detect.
The first surge detector 20 converts the surge signal _{Ss_a} from an analog signal to a digital signal, and outputs the digital signal to the _fault point calculator 40 as _a first digital signal Da.

The first signal separation unit 21 has an input terminal 21 a connected to the first point 11, a first output terminal 21 b connected to an input terminal 22 a of the first synchronization signal generation unit 22, and a second output terminal. 21 c is connected to the input terminal 23 a of the first converter 23.
The first signal separating unit 21, the signal flowing through the first point 11, to extract a respective transmit signal _{S p_a} and surge signal _{S s_a.} Here, a transmission signal extracted by the first separator 21, in order to distinguish the transmission signal S _p flowing through the transmission line 1, the transmission signals extracted by the first separator 21 ' _{Sp_a} ".
The first signal separation unit 21 outputs the extracted transmission signal _{Sp_a} to the first synchronization signal generation unit 22 and outputs the extracted surge signal _{Ss_a} to the first conversion unit 23.

The first synchronization signal generation unit 22 is realized by, for example, a PLL (Phase Locked Loop) circuit, a multiplier, or a DDS (Direct Digital Synthesizer).
The first synchronization signal generation unit 22 has an input terminal 22 a connected to a first output terminal 21 b of the first signal separation unit 21, and an output terminal 22 b connected to a clock terminal 23 b of the first conversion unit 23. I have.
First synchronizing signal generating unit 22, in synchronization with the transmission signal S _{p_a} extracted by the first signal separator 21 first generates a clock signal C _a and the first clock signal C _a first 1 to the conversion unit 23.
The frequency of the transmission signal S _{p_a} extracted by the first separator 21, and the frequency of the first clock signal C _a, which is generated by the first synchronizing signal generator 22 may be the same , May be different.
Although not shown in FIG. 1, the first synchronization signal generating unit 22, when it is implemented by a PLL circuit or DDS, the frequency of the first clock signal C _a is determined according to an externally applied control signal .

The first conversion unit 23 is realized by, for example, a ΔΣ-type or flash-type ADC (Analog to Digital Converter).
The first conversion unit 23 has an input terminal 23a connected to a second output terminal 21c of the first signal separation unit 21, a clock terminal 23b connected to an output terminal 22b of the first synchronization signal generation unit 22, The output terminal 23c is connected to the first input terminal 40a of the accident point calculator 40.
First converting section 23 in synchronization with the first clock signal C _a, which is generated by the first synchronizing signal generating unit 22, a surge signal S _{s_a} extracted by the first separator 21 analog The analog signal is converted into a digital signal by sampling the signal.
The first converter 23 outputs the digital signal to the accident point calculator 40 as _a first digital signal Da.

The second surge detector 30 includes a second signal separator 31, a second synchronization signal generator 32, and a second converter 33.
In the second surge detector 30, the input terminal 30a is connected to the second point 12, and the output terminal 30b is connected to the second input terminal 40b of the fault point calculator 40.
The second surge detector 30, when a surge signal S _s by damage to the transmission line 1 is generated, in synchronization with the transmission signal S _p flowing through the second point 12, a surge signal S _{S_B} To detect.
The second surge detector 30, a surge signal S _{S_B} converted from an analog signal to a digital signal, and outputs the accident point calculation unit 40 the digital signal as a second digital signal D _b.

The second signal separation unit 31 has an input terminal 31a connected to the second point 12, a first output terminal 31b connected to an input terminal 32a of the second synchronization signal generation unit 32, and a second output terminal. 31c is connected to the input terminal 33a of the second converter 33.
Second signal separating unit 31, the signal flowing through the second point 12, extracts the respective transmission signal _{S p_b} and surge signal _{S S_B.} Here, a transmission signal extracted by the second signal separating unit 31, in order to distinguish the transmission signal S _p flowing through the transmission line 1, the transmission signals extracted by the second signal separating unit 31 It is described as " _{Sp_b} ".
The second signal separation unit 31 outputs the extracted transmission signal _{Sp_b} to the second synchronization signal generation unit 32, and outputs the extracted surge signal _{Ss_b} to the second conversion unit 33.

The second synchronization signal generator 32 is realized by, for example, a PLL circuit, a multiplier, or a DDS.
The second synchronization signal generator 32 has an input terminal 32 a connected to the first output terminal 31 b of the second signal separator 31, and an output terminal 32 b connected to the clock terminal 33 b of the second converter 33. I have.
Second synchronizing signal generating unit 32 generates a second clock signal C _b are synchronized with the transmission signal S _{p_b} extracted by the second signal separating unit 31, the second clock signal C _b the 2 to the conversion unit 33.
The frequency of the transmission signal S _{p_b} extracted by the second signal separating unit 31, and the frequency of the second clock signal C _b generated by the second synchronizing signal generating unit 32 may be the same , May be different.
Although not shown in FIG. 1, a second synchronizing signal generation unit 32, when it is implemented by a PLL circuit or DDS, the frequency of the second clock signal C _b is determined according to an externally applied control signal .
The frequency of the second clock signal C _b generated by the second synchronizing signal generating unit 32 is the same as the frequency of the first clock signal C _a, which is generated by the first synchronizing signal generator 22 . However, the second clock signal C _b of the phase generated by the second synchronizing signal generator 32, synchronized with the first clock signal C _a phase generated by the first synchronizing signal generator 22 Absent.

The second conversion unit 33 is realized by, for example, a ΔΣ-type or flash-type ADC.
The second conversion unit 33 has an input terminal 33a connected to the second output terminal 31c of the second signal separation unit 31, a clock terminal 33b connected to an output terminal 32b of the second synchronization signal generation unit 32, The output terminal 33c is connected to the second input terminal 40b of the fault point calculator 40.
The second converter 33 in synchronization with the second clock signal C _b generated by the second synchronizing signal generating unit 32, a surge signal S _{S_B} extracted by the second signal separating unit 31 Analog An analog signal is converted into a digital signal by sampling the signal.
The second conversion unit 33 outputs the digital signal to the fault point calculating section 40 as the second digital signal D _b.

The fault point calculation unit 40 includes a phase difference detection unit 61, an angular frequency detection unit 62, and a fault point calculation processing unit 63 (see FIG. 4) described later, and is realized by, for example, an FPGA (Field Programmable Gate Array). You.
In the fault point calculation unit 40, the first input terminal 40a is connected to the output terminal 20b of the first surge detection unit 20, and the second input terminal 40b is connected to the output terminal 30b of the second surge detection unit 30. ing.
Fault point calculation unit 40, and a second digital signal D _b output from the first digital signal D _a and the second converter 33, which is output from the first conversion unit 23, an accident of the transmission line 1 Point 13 is calculated.
τ _a is the time required for the surge signal S _{s_a} to reach the first point 11 from the accident point 13, and τ _b is the time required for the surge signal S _{s_b} to reach the second point 12 from the accident point 13 It is the time required.
A transmission rate of the transmission signal _{S p,} the surge signal _{S s_a,} the transmission speed of _{S S_B,} the same transmission rate v.

FIG. 2 is a configuration diagram illustrating the first signal separation unit 21 of the accident point locating device according to the first embodiment.
In FIG. 2, the first filter 51 is a filter in which the frequency of the transmission signal _{Sp_a} is within the pass band and the frequency of the surge signal S _{s_a} is outside the pass band, and is implemented by, for example, an LPF (Low Pass Filter). Is done.
The first filter 51 suppresses the surge signal S _{s_a} included in the signal flowing through the first point 11 and extracts the transmission signal _{Sp_a} from the signal flowing through the first point 11, The transmission signal _{Sp_a} is output to the first synchronization signal generation unit 22.
The LPF is realized using a chip inductor or a chip capacitor. The LPF may mount a microstrip line or a coaxial resonator according to the pass band of the LPF and the suppression amount of the surge signal _{Ss_a} .
The second filter 52 is a filter in which the frequency of the surge signal S _{s_a} is within the pass band and the frequency of the transmission signal _{Sp_a} is outside the pass band, and is realized by, for example, an HPF (High Pass Filter).
The second filter 52 suppresses the transmission signal _{Sp_a} included in the signal flowing through the first point 11 and extracts the surge signal _{Ss_a} from the signal flowing through the first point 11; It outputs the surge signal _{Ss_a} to the first converter 23.
The HPF is realized using a chip inductor or a chip capacitor. The HPF may include a microstrip line or a coaxial resonator according to the passband of the HPF and the amount of suppression of the transmission signal _{Sp_a} .

FIG. 3 is a configuration diagram illustrating the second signal separation unit 31 of the accident point locating device according to the first embodiment.
In FIG. 3, the third filter 53 is a filter in which the frequency of the transmission signal _{Sp_b} is within the pass band and the frequency of the surge signal S _{s_b} is outside the pass band, and is realized by, for example, an LPF.
The third filter 53 suppresses the surge signal S _{s_b} included in the signal flowing through the second point 12 and extracts the transmission signal _{Sp_b} from the signal flowing through the second point 12, The transmission signal _{Sp_b} is output to the second synchronization signal generator 32.
The LPF may mount a microstrip line or a coaxial resonator according to the pass band of the LPF and the amount of suppression of the surge signal _{Ss_b} .
The fourth filter 54 is a filter in which the frequency of the surge signal S _{s_b} is within the pass band and the frequency of the transmission signal _{Sp_b} is outside the pass band, and is realized by, for example, an HPF.
The fourth filter 54 suppresses the transmission signal _{Sp_b} included in the signal flowing through the second point 12 and extracts the surge signal _{Ss_b} from the signal flowing through the second point 12; The surge signal S _{s_b} is output to the second converter 33.
The HPF may include a microstrip line or a coaxial resonator according to the passband of the HPF and the amount of suppression of the transmission signal _{Sp_b} .

FIG. 4 is a configuration diagram illustrating the accident point calculation unit 40 of the accident point locating device according to the first embodiment.
4, the phase difference detection unit 61, the phase of the first digital signal D _a which is output from the first conversion unit 23, the second digital signal D _b output from the second conversion unit 33 It detects the phase difference D _c between the phase, and outputs the phase difference D _c accident point calculation unit 63.
The angular frequency detection unit 62 converts the angular frequency ω _s of the surge signal S _{s_b by performing} , for example, Fast Fourier Transform (FFT) on the second digital signal D _b output from the second conversion unit 33. To detect.
Here, angular frequency detection unit 62, detects the angular frequency omega _s of the surge signal S _{S_B.} However, this is only an example, the angular frequency detection unit 62, by FFT the first digital signal D _a which is output from the first converter 23, detects the angular frequency omega _s of the surge signal S _{s_a} You may make it do.

Fault point calculation unit 63, a phase difference D _c detected by the phase difference detection unit 61, from the detected angular frequency omega _s by the angular frequency detection unit 62, the surges signal S _{s_a} accident point 13 1 Τ _a required to reach the point 11 is calculated.
Fault point calculation unit 63, and a transmission speed v and time tau _a surge signal _{S s_a,} it calculates the fault point 13.

Next, the operation of the accident point locator shown in FIG. 1 will be described.
FIG. 5 is a flowchart showing an accident point locating method which is a processing procedure of the accident point locator shown in FIG.
Here, other than the transmission line 1, it is assumed that the transmission delay of the transmission delay and the surge signal S _s of the transmission signal S _p is not generated.

First, the transmission signal S _p to be transmitted to the transmission line 1 is represented by the following equation (1).

In the formula (1), is omega _p, the angular frequency of the transmission signal _{S p,} theta _p is the initial phase of the transmission signal _{S p.} Also, t is a time, and the same applies to the following equation.
For convenience of explanation, the first point 11, when the starting point of the transmission signal S _p, the transmission signal S _{p_a} at the first point 11 is expressed by the following equation (2).

Then, by damage to the transmission line 1 occurs, the surge signal S _s generated at the fault point 13 is damaged position is expressed by the following equation (3).

In the formula (3), the omega _s, the angular frequency of the surge signal _{S s,} theta _s is the initial phase of the surge signal _{S s.}

Of surge signal _{S s,} the surge signal _{S s_a} flowing from the fault point 13 in a direction towards the first point 11, to the accident point 13 until it reaches the first point 11, it takes time for tau _a.
Therefore, the surge signal _{Ss_a} at the first point 11 is represented by the following equation (4).

Also, of the surge signals S _s , the surge signal S _{s_b} flowing in the direction from the accident point 13 to the second point 12 requires a time τ _b from the accident point 13 to the second point 12. .
Therefore, the surge signal S _{s_b} at the second point 12 is represented by the following equation (5).

Transmission signal S _p to the starting point of the first point 11, to reach the second point 12, takes time τ _{a +} τ _b.
Therefore, the transmission signal _{Sp_b} at the second point 12 is represented by the following equation (6).

The first separator 21 of the first surge detector 20, the signal flowing through the first point 11, to extract a respective transmit signal _{S p_a} and surge signal _{S s_a} (step ST1 in FIG. 5) .
Hereinafter, the processing procedure of the first signal separation unit 21 will be specifically described.
When the signal flowing through the first point 11 is input, the first filter 51 suppresses the surge signal S _{s_a} included in the signal flowing through the first point 11, and The transmission signal _{Sp_a} is extracted from the signal flowing through.
The first filter 51 outputs the transmission signal _{Sp_a} to the first synchronization signal generator 22.
When the signal flowing through the first point 11 is input, the second filter 52 suppresses the transmission signal _{Sp_a} included in the signal flowing through the first point 11, and The surge signal S _{s_a} is extracted from the signal flowing through.
The second filter 52 outputs the surge signal _{Ss_a} to the first converter 23.

Upon receiving the transmission signal _{Sp_a} from the first signal separation unit 21, the first synchronization signal generation unit 22 generates a first clock signal _Ca synchronized with the transmission signal _{Sp_a} , and generates _a first clock signal. and it outputs the signal _{C a} in the first conversion unit 23 (step ST2 of FIG. 5).
The angular frequency of the first clock signal C _a can, when it is N times the angular frequency omega _p of the transmit signal S _{p_a,} the first clock signal C _a can be expressed by the following equation (7) . And a 2Nω _p> ω _s.

First converting section 23 in synchronization with the first clock signal C _a, which is generated by the first synchronizing signal generating unit 22, a surge signal S _{s_a} output from the first separator 21 analog The analog signal is converted into a digital signal by sampling the signal (step ST3 in FIG. 5).
The first converter 23 samples an analog signal by oversampling.
The first conversion unit 23, for example, to sample the digital signal to analog signal at the rising edge of the first clock signal C _a.
Rise timing _{t C_A} of the first clock signal _{C a} can be expressed by the following equation (8).

First digital signal D _a which is output from the first converter 23 to the fault point calculation unit 40, the equation (4) and (8), is expressed by the following equation (9).

The second signal separator 31 of the second surge detector 30, the signal flowing through the second point 12, extracts the respective transmission signal _{S p_b} and surge signal _{S S_B} (step ST4 in FIG. 5) .
Hereinafter, the processing procedure of the second signal separation unit 31 will be specifically described.
When the signal flowing through the second point 12 is input, the third filter 53 suppresses the surge signal S _{s_b} included in the signal flowing through the second point 12, and The transmission signal _{Sp_b} is extracted from the signal flowing through.
The third filter 53 outputs the transmission signal _{Sp_b} to the second synchronization signal generator 32.
When the signal flowing through the second point 12 is input, the fourth filter 54 suppresses the transmission signal _{Sp_b} included in the signal flowing through the second point 12, and The surge signal S _{s_b} is extracted from the signal flowing through.
The fourth filter 54 outputs the surge signal _{Ss_b} to the second converter 33.

Second synchronizing signal generating unit 32 receives the transmission signal S _{p_b} from the second signal separating unit 31, and generates a second clock signal C _b are synchronized with the transmission signal S _{p_b,} a second clock and outputs the signal _{C b} in the second conversion unit 33 (step ST5 in FIG. 5).
The angular frequency of the second clock signal C _b is, when an N times the angular frequency omega _p of the transmit signal S _{p_b,} the second clock signal C _b is expressed by the following equation (10) .

The second converter 33 in synchronization with the second clock signal C _b generated by the second synchronizing signal generating unit 32, a surge signal S _{S_B} outputted from the second signal separating unit 31 Analog The analog signal is converted into a digital signal by sampling the signal (step ST6 in FIG. 5).
The second converter 33 samples an analog signal by oversampling.
The second converter 33, for example, to sample the digital signal to analog signal at the rising edge of the second clock signal C _b.
Rise timing _{t C_B} of the second clock signal _{C b} is expressed by the following equation (11).

Second digital signal D _b output from the second converter 33 to the fault point calculation unit 40, the equation (5) and (11), is expressed by the following equation (12).

Fault point calculation unit 40, and a second digital signal D _b output from the first digital signal D _a and the second converter 33, which is output from the first conversion unit 23, an accident of the transmission line 1 The point 13 is calculated (step ST7 in FIG. 5).
Hereinafter, the processing procedure of the accident point calculation unit 40 will be specifically described.

Phase difference detection unit 61 includes a first digital signal D _a phase output from the first converting section 23, position of the second digital signal D _b of the phase output from the second conversion unit 33 detecting a phase difference D _c, and outputs the phase difference D _c accident point calculation unit 63.
The angular frequency detection unit 62 detects the angular frequency ω _s of the surge signal S _{s_b by performing} an FFT on the second digital signal D _b output from the second conversion unit 33, and determines the angular frequency ω _s as an accident point. Output to the calculation processing unit 63.

Fault point calculation processing section 63 receives the phase difference D _c from the phase difference detecting unit 61 receives the angular frequency omega _s from angular frequency detection unit 62, as shown in the following equation (13), the phase difference D _c from the angular frequency ω _s, to calculate the time τ _a.

Then, the fault point calculation unit 63, and a transmission speed v and time tau _a surge signal _{S s_a,} calculates the fault point 13.
The distance L from the first point 11 to the accident point 13 is represented by the following equation (14), and calculating the distance L corresponds to calculating the accident point 13.
L = v × τ _a (14)

In the first embodiment described above, one end is connected to the first point 11 on the transmission line 1, and when the surge signal is generated due to damage to the transmission line 1, the signal flows through the first point 11. One end is connected to a first surge detector 20 that detects a surge signal in synchronization with the transmission signal, and a second point 12 different from the first point 11 in the transmission line 1. A second surge detector 30 for detecting a surge signal in synchronization with a transmission signal flowing through the first and second surge detectors, and a surge signal detected by the first surge detector 20 and a second surge detector 30 detecting the surge signal. The fault point locating device was configured to include a fault point calculation unit 40 that calculates a fault point 13 which is a damage position of the transmission line 1 from a surge signal. Therefore, the fault point locating device can calculate the fault point 13 of the transmission line 1 without transmitting and receiving voltage information and the like via the communication line.

In the first signal separation unit 21 shown in FIG. 2, the first filter 51 is realized by an LPF, and in the second signal separation unit 31 shown in FIG. 3, the third filter 53 is realized by an LPF. However, the first filter 51 only _needs to be able to suppress the surge signal S _{s_a} included in the signal flowing through the first point 11 and extract the transmission signal _{Sp_a,} and is limited to the one realized by the LPF. Not something. The third filter 53 only _needs to be _able to suppress the surge signal S _{s_b} included in the signal flowing through the second point 12 and extract the transmission signal _{Sp_b,} and is limited to those realized by the LPF. Not something.
Therefore, each of the first filter 51 and the third filter 53 may be realized by, for example, a BPF (Band Pass Filter) or a BRF (Band Rejection Filter).

In the first signal separation unit 21 shown in FIG. 2, the second filter 52 is realized by an HPF, and in the second signal separation unit 31 shown in FIG. 3, the fourth filter 54 is realized by an HPF. However, the second filter 52 suppresses the transmission signal _{Sp_a} included in the signal flowing through the first point 11 and extracts the surge signal S _{s_a} from the signal flowing through the first point 11. It is sufficient if possible, and the invention is not limited to the one realized by the HPF. Further, the fourth filter 54 suppresses the transmission signal _{Sp_b} included in the signal flowing through the second point 12 and extracts the surge signal S _{s_b} from the signal flowing through the second point 12. It is sufficient if possible, and the invention is not limited to the one realized by the HPF.
Therefore, each of the second filter 52 and the fourth filter 54 may be realized by, for example, a BPF or a BRF.

In the accident point locating device shown in FIG. 1, each of the first converter 23 and the second converter 33 samples an analog signal by oversampling. However, this is only an example, each of the first conversion portion 23 and the second conversion unit 33, may be sampled analog signal by undersampling (2Nω _p ≦ ω _s).
It is to be N = 1, if the frequency of the transmission signal S _{p_a} the frequency of the first clock signal C _a are the same, may be omitted first synchronizing signal generating unit 22. Further, if the frequency of the transmission signal S _{p_b} the frequency of the second clock signal C _b are the same may be omitted and the second synchronization signal generating unit 32.

Embodiment 2 FIG.
In the second embodiment, a transmission delay occurs in the first and second transmission lines connecting the first surge detector 20 and the fault point calculator 80, and the second surge detector 30 and the fault point calculator 80 An accident point locator in which a transmission delay occurs in the third and fourth transmission lines connecting the two will be described.

FIG. 6 is a configuration diagram illustrating an accident point locating device according to the second embodiment. 6, the same reference numerals as those in FIG. 1 denote the same or corresponding parts, and a description thereof will not be repeated.
In the fault point locating apparatus shown in FIG. The signal generator 24 is provided. 20 c is an output terminal of the first surge detector 20.
Further, in the accident point locating device shown in FIG. Is provided. 30c is an output terminal of the second surge detector 30.

The first trigger signal generation unit 24 is realized by, for example, a PLL circuit, a DDS, or an ADC.
The first trigger signal generation unit 24 has an input terminal 24 a connected to the first output terminal 21 b of the first signal separation unit 21, and an output terminal 24 b connected to an input terminal of the second transmission line 72. .
First trigger signal generator 24 generates a first trigger signal E _a which synchronizes with the transmission signal S _{p_a} extracted by the first separator 21, via the second transmission line 72 , and outputs a first trigger signal E _a an accident point calculation unit 80.
The frequency of the transmission signal S _{p_a} extracted by the first separator 21, and the frequency of the first trigger signal E _a which is produced by the first trigger signal generator 24 may be the same , May be different.
Although not shown in FIG. 6, the first trigger signal generation unit 24, when it is implemented by a PLL circuit or DDS, the frequency of the first trigger signal E _a is determined according to an externally applied control signal .
When the first trigger signal generation unit 24 is realized by an ADC, the first trigger signal generation unit 24 _converts the transmission signal _{Sp_a} from an analog signal to a digital signal in synchronization with an externally _supplied clock signal. It converted to, or the digital signal as a first trigger signal E _a. First trigger signal generator 24 as a clock signal given from the outside, may be used first clock signal C _a, which is generated by the first synchronizing signal generator 22.

The second trigger signal generation unit 34 is realized by, for example, a PLL circuit, a DDS, or an ADC.
In the second trigger signal generator 34, the input terminal 34a is connected to the first output terminal 31b in the second signal separator 31, and the output terminal 34b is connected to the input end of the fourth transmission line 74. .
The second trigger signal generation unit 34 generates a second trigger signal _Eb synchronized with the transmission signal _{Sp_b} extracted by the second signal separation unit 31, and outputs the second trigger signal _Eb via the fourth transmission line 74. , And outputs the second trigger signal _Eb to the accident point calculation unit 80.
The frequency of the transmission signal S _{p_b} extracted by the second signal separating unit 31, and the frequency of the second trigger signal E _b generated by the second trigger signal generator 34 may be the same , May be different.
Although not illustrated in FIG. 6, when the second trigger signal generation unit 34 is realized by a PLL circuit or a DDS, the frequency of the second trigger signal _Eb is determined according to a control signal provided from the outside. .
When the second trigger signal generator 34 is realized by an ADC, the second trigger signal generator 34 _converts the transmission signal _{Sp_b} from an analog signal to a digital signal in synchronization with an externally applied clock signal. And the digital signal may be used as the second trigger signal _Eb . Second trigger signal generator 34, a clock signal given from the outside, may be used a second clock signal C _b generated by the second synchronizing signal generating unit 32.

Each of the first transmission line 71, the second transmission line 72, the third transmission line 73, and the fourth transmission line 74 is realized by, for example, a coaxial cable or a twisted pair line including a signal line and a ground line. Is done.
The first transmission line 71 has an input terminal connected to the output terminal 20 b of the first surge detector 20 and an output terminal connected to the first input terminal 80 a of the fault point calculator 80.
The first transmission line 71, the first digital signal D _a which is output from the first conversion unit 23 is delayed by a first delay time t _d1, the first digital signal D _a of the delayed first _Is output to the accident point calculation unit 80 as the digital signal D _a1 of.
The second transmission line 72 has an input terminal connected to the output terminal 20 c of the first surge detector 20 and an output terminal connected to the second input terminal 80 b of the fault point calculator 80.
Second transmission line 72, the first trigger signal E _a which is produced by the first trigger signal generator 24 is delayed by a first delay time t _d1, the first trigger signal E _a the delayed The signal is output to the accident point calculation unit 80 as the first trigger signal _Ea1 .

The third transmission line 73 has an input terminal connected to the output terminal 30 b of the second surge detection unit 30 and an output terminal connected to the third input terminal 80 c of the fault point calculation unit 80.
The third transmission line 73, the second digital signal D _b output from the second conversion unit 33 is delayed by a second delay time t _d2, the second digital signal D _b of the delayed second _Is output to the accident point calculation unit 80 as the digital signal D _b1 of
The fourth transmission line 74 has an input terminal connected to the output terminal 30 c of the second surge detection unit 30 and an output terminal connected to the fourth input terminal 80 d of the fault point calculation unit 80.
The fourth transmission line 74 delays the second trigger signal _Eb generated by the second trigger signal generator 34 by a second delay time td2, and _{converts the} delayed second trigger signal _Eb . The signal is output to the accident point calculation unit 80 as the second trigger signal _Eb1 .

The accident point calculation unit 80 includes a first time difference calculation unit 81, a second time difference calculation unit 82, and an accident point calculation processing unit 83 (see FIG. 7), which will be described later. You.
In the fault point calculation unit 80, the first input terminal 80a is connected to the output terminal of the first transmission line 71, and the second input terminal 80b is connected to the output terminal of the second transmission line 72. In the accident point calculation unit 80, the third input terminal 80c is connected to the output terminal of the third transmission line 73, and the fourth input terminal 80d is connected to the output terminal of the fourth transmission line 74. .
The fault point calculation unit 80 calculates the _fault point 13 from the first digital signal D _a1 , the first trigger signal E _a1 , the second digital signal D _b1 , and the second trigger signal E _b1. .

FIG. 7 is a configuration diagram illustrating an accident point calculation unit 80 of the accident point location device according to the second embodiment.
In FIG. 7, a first time difference calculation unit 81 includes a rising time of the first digital signal D _a1 output from the first transmission line 71 and a first trigger output from the second transmission line 72. A first time difference, which is a time difference from the rising time of the signal _Ea1 , is calculated.
The first time difference calculation section 81 outputs the first time difference to the accident point calculation processing section 83.
The second time difference calculation unit 82 calculates the rising time of the second digital signal D _b1 output from the third transmission line 73 and the second trigger signal E _b1 output from the fourth transmission line 74. A second time difference, which is a time difference from the rising time, is calculated.
The second time difference calculation unit 82 outputs the second time difference to the accident point calculation processing unit 83.
The accident point calculation processing unit 83 calculates the accident point 13 based on the first time difference calculated by the first time difference calculation unit 81 and the second time difference calculated by the second time difference calculation unit 82. Is calculated.

FIG. 8 is an explanatory diagram showing signals handled by the first surge detector 20.
In FIG. 8, Y _D, of the first digital signal D _a to be discretely outputted from the first converter 23, a fault point 13 by the surge signal S _s is generated, initially non-zero a D _a which is changed to a value, the rise time of the D _a.
Y _E, of the first trigger signal _{E a} to be discretely outputted from the first trigger signal generator 24, the signal level is L level (for example, "0") from the H level (for example, "1" ) is the first E _b at a transition to.
t _a is the time difference between the time of the time and _{Y D} of _{Y E.} t _d1 is the delay time of the first digital signal _D first trigger signal for the first delay time and a first trigger signal _{E a} of the digital signal _{D a1} for _{a E a1.}
Time difference t _a, the first digital signal D _a and a first trigger signal E _a is, before and after passing through the first transmission line 71 and the second transmission line 72, there is no change.

FIG. 9 is an explanatory diagram showing signals handled by the second surge detector 30.
In Figure 9, Z _D, of the second digital signal D _b that is discretely output from the second conversion unit 33, the accident point 13 by the surge signal S _s is generated, initially non-zero a D _b was changed to a value, which is D _b at the time of rising.
Z _E, among the second trigger signal E _b are discretely output from the second trigger signal generator 34, which is the first E _b when the signal level is changed from L level to H level.
t _b is the time difference between the time of the time and _{Z D} of _{Z E.} t _d2 is the delay time of the second digital signal _{D b} second trigger signal to the second delay time and a second trigger signal of the digital signal _{D b1} for _{E b E b1.}
Time difference t _b, the second digital signal D _b and the second trigger signal E _b is, before and after passing through the third transmission line 73 and the fourth transmission line 74, there is no change.

Next, the operation of the accident point locating device shown in FIG. 6 will be described.
However, except for the first trigger signal generation unit 24, the second trigger signal generation unit 34, and the accident point calculation unit 80, they are the same as the accident point locating device shown in FIG. The operation of the generator 24, the second trigger signal generator 34, and the accident point calculator 80 will be described.
Here, transmission line 1, the first transmission line 71, the second transmission line 72, other than the third transmission line 73 and the fourth transmission line 74, the transmission delay and the surge signal S _s of the transmission signal S _p It is assumed that no transmission delay occurs.

Upon receiving the transmission signal _{Sp_a} from the first signal separation unit 21, the first trigger signal generation unit 24 generates a first trigger signal _Ea synchronized with the transmission signal _{Sp_a} , and generates _a first trigger signal. and outputs a signal _{E a} to the second transmission line 72.
First trigger signal _{E a,} for example, as shown in FIG. 8, the transmit signal when the amplitude of _{S p_a} is equal to or larger than the threshold Th, the signal level becomes the H level, the transmission signal _{S p_a} amplitude is less than the threshold value Th of , The signal level becomes L level. The threshold value Th is, for example, a value that is half of the maximum amplitude of the transmission signal _{Sp_a} . The threshold value Th is stored in, for example, the internal memory of the first trigger signal generation unit 24 and the internal memory of the second trigger signal generation unit 34. The threshold Th may be externally given to each of the first trigger signal generator 24 and the second trigger signal generator 34.

First digital signal D _a which is output from the first conversion unit 23, the first transmission line 71 is transmitted to the fault point calculation unit 80. At this time, the first digital signal _Da is delayed by the first delay time t _{d1 in} the first transmission line 71, so that the delayed first digital signal _Da is converted to the first digital signal Da. It is input to the accident point calculation unit 80 as _Da1 .
The first trigger signal E _a which is produced by the first trigger signal generator 24, the second transmission line 72 is transmitted to the fault point calculation unit 80. In this case, the first trigger signal E _a, in the second transmission line 72, to be delayed by the first delay time t _d1, the first trigger signal E _a post delay, the first trigger signal E _a1 is input to the accident point calculation unit 80.

Second trigger signal generator 34 receives the transmission signal S _{p_b} from the second signal separating unit 31, to generate a second trigger signal E _b which is synchronized with the transmission signal S _{p_b,} second trigger The signal _Eb is output to the fourth transmission line 74.
Second trigger signal _{E b} is, for example, as shown in FIG. 9, the transmission signal when the amplitude of _{S p_b} is equal to or larger than the threshold Th, the signal level becomes the H level, the transmission signal _{S p_b} amplitude is less than the threshold value Th of , The signal level becomes L level.

Second digital signal D _b output from the second converter 33, the third transmission line 73 is transmitted to the fault point calculation unit 80. At this time, the second digital signal _Db is delayed by the second delay time _td2 in the third transmission line 73, so that the delayed second digital signal _Db is converted to the second digital signal Db. _Db1 is input to the accident point calculation unit 80.
The second trigger signal _Eb generated by the second trigger signal generator 34 is transmitted to the fault point calculator 80 via the fourth transmission line 74. At this time, the second trigger signal _Eb is delayed by the second delay time _td2 in the fourth transmission line 74, so that the delayed second trigger signal _Eb is changed to the second trigger signal. _Eb1 is input to the accident point calculation unit 80.

The fault point calculation unit 80 calculates the _fault point 13 from the first digital signal D _a1 , the first trigger signal E _a1 , the second digital signal D _b1 , and the second trigger signal E _b1. .
Hereinafter, the processing procedure of the accident point calculation unit 80 will be specifically described.

The first time difference calculating unit 81 detects the rising of the first digital signal _Da1 output from the first transmission line 71, and also detects the first trigger signal E output from the second transmission line 72. The rising _edge of _a1 is detected.
The first time difference calculating unit 81 calculates a time difference between the detected rising time of the first digital signal D _a1 and the detected rising time of the first trigger signal E _a1 as _a first time difference ta. I do.
A first time difference calculation section 81 outputs a first time difference t _a the fault point calculation processing unit 83.

The second time difference calculation unit 82 detects the rising of the second digital signal D _b1 output from the third transmission line 73, and also detects the second trigger signal E output from the fourth transmission line 74. The rise of _b1 is detected.
The second time difference calculator 82 calculates a time difference between the detected rising time of the second digital signal D _b1 and the detected rising time of the second trigger signal E _{b1 as} a second time difference t _b. I do.
The second time difference calculating unit 82 outputs the second time difference t _b the fault point calculation processing unit 83.

Fault point calculation unit 83 holds the phase information of the transmission signal S _{p_b} in the phase information and the second point 12 of the transmission signal S _{p_a} at the first point 11.
These phase information may be externally provided to the fault point calculation processing unit 83 or may be measured by the fault point calculation processing unit 83.
Further, the distance from the not shown source of the transmission signal S _p to the first point 11 and second point 12, and a frequency of the transmission signal S _p, the fault point calculation processing unit 83, a phase information calculation May be performed.

Fault point calculation unit 83, the phase information of the transmission signal _{S p_a} at the first point 11, and calculates the time _{t YE} of _{Y E.}
Further, the fault point calculation unit 83, the phase information of the transmission signal _{S p_b} at the second point 12 to calculate the time _{t ZE} of _{Z E.}
The processing itself for calculating the times t _YE and t _ZE from the phase information is a known technique, and a detailed description thereof will be omitted.
Fault point calculation unit 83, from a first time difference _{t a} which is output from the first time difference calculation unit 81, the time _{t YE} of the calculated _{Y E,} and calculates the time _{t YD} of _{Y D.}
Further, the fault point calculation processing unit 83, calculates a second time difference _{t b} output from the second time difference calculating portion 82, from the time _{t ZE} of the calculated _{Z E,} the time _{t ZD} of _{Z D} I do.

Then, the fault point calculation processing unit 83, from the transmission speed v of the surge signal _{S s_a,} the time _{t ZD} time _{t YD} and _{Z D} of _{Y D,} calculates the fault point 13.
Distance L _b from the second point 12 to the fault point 13 is expressed as the following equation (15), to calculate the distance L _b is equivalent to calculating the fault point 13.

In Expression (15), the distance La is _a distance from the first point 11 to the accident point 13, and | L _a + L _b | is known in the accident point calculation processing unit 83.
At this time, if t _YD > t _ZD , the accident point 13 is a position closer to the second point 12 than to the first point 11.
If t _YD <t _ZD , the accident point 13 is a position closer to the first point 11 than to the second point 12.

In the second embodiment described above, the accident point calculation unit 80 determines that the first digital signal D _a1 , the first trigger signal E _a1 , the second digital signal D _b1 , and the second trigger signal E _b1 Thus, the accident point locating device was configured to calculate the accident point 13. Therefore, the fault point locating device of the second embodiment can calculate the fault point 13 without transmitting and receiving voltage information and the like via the communication line, similarly to the fault point locating device of the first embodiment. .
In addition, the fault point locating device according to the second embodiment includes a delay time in a transmission line between the first surge detector 20 and the fault point calculator 80, a second surge detector 30, and a fault point calculator. The fault point 13 can be calculated even when the delay time in the transmission line between the fault point 80 and the delay time 80 differs. Therefore, the fault point locating device according to the second embodiment can increase the selectivity of the line length of the transmission line as compared with the fault point locating device according to the first embodiment, and can further increase the selectivity of the first surge detector 20 and the second surge detector. The selectivity of each installation position in the surge detection unit 30 and the accident point calculation unit 80 can be improved.

In the accident point locating device shown in FIG. 6, the first time difference calculating section 81 calculates the time difference between the rising time of the first digital signal D _{a1 and} the rising time of the first trigger signal E _a1 by the first time. It is calculated as the time difference t _a. However, this is only an example, and the first time difference calculation unit 81 calculates the time difference between the falling time of the first digital signal D _{a1 and} the falling time of the first trigger signal E _a1 by the first time. _May be calculated as the time difference ta.
In the accident point locating device shown in FIG. 6, the second time difference calculation unit 82 calculates the time difference between the rising time of the second digital signal D _{b1 and} the rising time of the second trigger signal E _b1 in the second time. It is calculated as the time difference t _b. However, this is only an example, and the second time difference calculating unit 82 calculates the time difference between the falling time of the second digital signal D _{b1 and} the falling time of the second trigger signal E _b1 by the second time. _May be calculated as the time difference tb.
In addition, the first time difference calculation unit 81 calculates a time difference between the fall time of the first digital signal _{Da1 and} the fall time of the first trigger signal _Ea1 as _a first time difference ta. Then, the second time difference calculator 82 calculates the time difference between the rising time of the second digital signal D _{b1 and} the rising time of the second trigger signal E _b1 as the second time difference t _b. It may be.
The first time difference calculation section 81 calculates the rise time of the first digital signal D _a1, the time difference between the rise time of the first trigger signal E _a1 as the first time difference t _a, The second time difference calculation unit 82 calculates the time difference between the fall time of the second digital signal D _{b1 and} the fall time of the second trigger signal E _{b1 as} a second time difference t _b. It may be.

In the fault point locating system shown in FIG. 6, a first trigger signal generator 24 generates a first trigger signal E _a which synchronizes with the transmission signal S _{p_a,} a second trigger signal generator 34, and it generates a second trigger signal E _b which is synchronized with the transmission signal S _{p_b.}
However, this is only an example, the first trigger signal E _a has only to be synchronized with the transmission signal S _{p_a,} the second trigger signal E _b has only to be synchronized with the transmission signal S _{p_b} . Therefore, the first trigger signal generation unit 24, a first trigger signal _{E a,} using the transmission signal _{S p_a,} the second trigger signal generation unit 34, as a second trigger signal _{E b,} the transmission signal S _{p_b} may be used.

In the accident point locating device shown in FIG. 6, the first surge detector 20 includes a first converter 23, and the second surge detector 30 includes a second converter 33.
However, the first time difference calculation unit 81, if detects a rise of the surge signal _{S s_a,} can calculate the first time difference _{t a,} the second time difference calculating section 82, the rise of the surge signal _{S S_B} if detected, it calculates the second time difference t _b. Therefore, the first surge detector 20 includes a detector that detects the surge signal S _{s_a} instead of the first converter 23, and the second surge detector 30 replaces the second converter 33. In addition, a detector for detecting the surge signal _{Ss_b} may be provided.

Embodiment 3 FIG.
In the third embodiment, a fault point locating device that calculates a fault point 13 of a transmission line 2 having three transmission lines 2a, 2b, and 2c will be described.
FIG. 10 is a configuration diagram illustrating an accident point locating device according to the third embodiment. In FIG. 10, the same reference numerals as those in FIG.
The transmission line 2 has three transmission lines 2a, 2b, 2c. Transmission signal S _p is a power transmitted by the transmission line 2 is a signal of the three-phase AC.
In the fault point locating system shown in FIG. 10, the transmission signal S _p is flowing in a direction from the first point 11 to a second point 12.

The first surge detector 100 includes a first signal synthesizer 101, a first filter 102, a first synchronization signal generator 103, a second filter 104, and a first converter 23.
In the first surge detector 100, the input terminals 100a, 100b, 100c are connected to the first point 11, and the output terminal 100d is connected to the first input terminal 40a of the fault point calculator 40.
When the surge signal S _s is generated due to damage to the transmission line 2, the first surge detection unit 100 detects the surge signal S _{s_a} in synchronization with the transmission signal _{Sp_a} flowing through the first point 11. To detect.
The first surge detector 100 converts the surge signal _{Ss_a} from an analog signal to a digital signal, and outputs the digital signal to the _fault point calculator 40 as _a first digital signal Da.

The first signal combining unit 101 is realized by, for example, a combiner mounting a resistor and a transformer, a hybrid circuit, or a circuit in which a 180-degree hybrid circuit and a 180-degree phase shifter are combined.
In the first signal combining unit 101, the input terminal 101a is connected to the first point 11 on the transmission line 2a, the input terminal 101b is connected to the first point 11 on the transmission line 2b, and the input terminal 101c is connected to the transmission line 2c. Is connected to the first point 11 in.
Further, the output terminal 101 d of the first signal synthesis unit 101 is connected to the input terminal 104 a of the second filter 104.
The first signal combining unit 101 adds the voltages or currents of the three-phase AC signals flowing through the first point 11 in the three transmission lines 2a, 2b, and 2c in the same phase, thereby performing the first combining. Generate a signal.
First signal combining section 101 outputs the first combined signal to second filter 104.

The first filter 102 is a filter in which the frequency of the transmission signal _{Sp_a} is within the passband and the frequency of the surge signal _{Ss_a} is outside the passband, and is realized by, for example, an LPF.
The first filter 102 has an input terminal 102a connected to the first point 11 in the transmission line 2a, and an output terminal 102b connected to the input terminal 103a of the first synchronization signal generator 103.
The first filter 102 suppresses the surge signal S _{s_a} included in the signal flowing through the first point 11 in the transmission line 2a, and _{reduces the} transmission signal _{Sp_a} from the signal flowing through the first point 11. And outputs the transmission signal _{Sp_a} to the first synchronization signal generation unit 103.

The first synchronization signal generation unit 103 is realized by, for example, a PLL circuit, a multiplier, or a DDS.
The first synchronization signal generator 103 has an input terminal 103 a connected to an output terminal 102 b of the first filter 102, and an output terminal 103 b connected to a clock terminal 23 b of the first converter 23.
First synchronizing signal generating unit 103 generates the first clock signal C _a which is synchronized with the transmission signal S _{p_a} extracted by the first filter 102, the first clock signal C _a first Output to the converter 23.
First synchronizing signal generating unit 103, transmission signal _{S p_a} by the first filter 102 is no longer extracted, the output of the transmission signal _{S p_a} from the first filter 102 is interrupted, interrupted the output of the transmission signal _{S p_a} is outputting a first clock signal C _a generated prior to the first converting section 23.
The frequency of the transmission signal S _{p_a} extracted by the first filter 102, the frequency of the first clock signal C _a, which is generated by the first synchronizing signal generator 103, may be the same, different May be.
Although not shown in FIG. 10, a first synchronizing signal generator 103, as implemented by the PLL circuit or DDS, the frequency of the first clock signal C _a is determined according to an externally applied control signal .

The second filter 104 is a filter in which the frequency of the surge signal S _{s_a} is within the pass band and the frequency of the transmission signal _{Sp_a} is outside the pass band, and is realized by, for example, an HPF.
The second filter 104 has an input terminal 104 a connected to the output terminal 101 d of the first signal synthesis unit 101, and an output terminal 104 b connected to the input terminal 23 a of the first conversion unit 23.
The second filter 104 suppresses the transmission signal _{Sp_a} included in the first combined signal generated by the first signal combining unit 101, and extracts the surge signal _{Ss_a} from the first combined signal. , And outputs the surge signal _{Ss_a} to the first converter 23.

The second surge detector 110 includes a second signal synthesizer 111, a third filter 112, a second synchronization signal generator 113, a fourth filter 114, and a second converter 33.
In the second surge detector 110, the input terminals 110a, 110b, 110c are connected to the second point 12, and the output terminal 110d is connected to the second input terminal 40b of the fault point calculator 40.
Second surge detecting unit 110, when a surge signal S _s by damage to the transmission line 2 has occurred, in synchronization with the transmission signal S _{p_b} flowing through the second point 12, a surge signal S _{S_B} To detect.
Second surge detecting unit 110, a surge signal S _{S_B} converted from an analog signal to a digital signal, and outputs the digital signal to the fault point calculating section 40 as the second digital signal D _b.

The second signal combining unit 111 is realized by, for example, a combiner mounting a resistor and a transformer, a hybrid circuit, or a circuit in which a 180-degree hybrid circuit and a 180-degree phase shifter are combined.
The second signal combining unit 111 has an input terminal 111a connected to the second point 12 on the transmission line 2a, an input terminal 111b connected to the second point 12 on the transmission line 2b, and an input terminal 111c connected to the transmission line 2c. Is connected to the second point 12 at
The output terminal 111 d of the second signal synthesizing unit 111 is connected to the input terminal 114 a of the fourth filter 114.
The second signal synthesizing unit 111 adds the voltages or currents of the three-phase alternating current signals flowing at the second point 12 in the three transmission lines 2a, 2b, and 2c in the same phase, thereby performing the second synthesis. Generate a signal.
The second signal synthesizing section 111 outputs the second synthesized signal to the fourth filter 114.

The third filter 112 is a filter in which the frequency of the transmission signal _{Sp_b} is within the pass band and the frequency of the surge signal S _{s_b} is outside the pass band, and is realized by, for example, an LPF.
The third filter 112 has an input terminal 112a connected to the second point 12 in the transmission line 2a, and an output terminal 112b connected to the input terminal 113a of the second synchronization signal generator 113.
The third filter 112 suppresses the surge signal S _{s_b} included in the signal flowing through the second point 12 in the transmission line 2a, and _{converts the} signal flowing through the second point 12 into the transmission signal _{Sp_b.} And outputs the transmission signal _{Sp_b} to the second synchronization signal generation unit 113.

The second synchronization signal generation unit 113 is realized by, for example, a PLL circuit, a multiplier, or a DDS.
The second synchronization signal generator 113 has an input terminal 113 a connected to an output terminal 112 b of the third filter 112, and an output terminal 113 b connected to a clock terminal 33 b of the second converter 33.
Second synchronizing signal generating unit 113, in synchronization with the transmission signal S _{p_b} extracted by the third filter 112 second to generate a clock signal C _b is, the second clock signal C _b second Output to the converter 33.
Second synchronizing signal generating unit 113, transmission signal _{S p_b} by the third filter 112 is no longer extracted, the output of the transmission signal _{S p_b} from the third filter 112 is interrupted, interrupted the output of the transmission signal _{S p_b} is outputting a second clock signal C _b generated prior to the second converter 33.
The frequency of the transmission signal S _{p_b} extracted by the third filter 112, and the frequency of the second clock signal C _b generated by the second synchronizing signal generator 113, may be the same, different May be.
Although not shown in FIG. 10, the second synchronizing signal generator 113, as implemented by the PLL circuit or DDS, the frequency of the second clock signal C _b is determined according to an externally applied control signal .

The fourth filter 114 is a filter in which the frequency of the surge signal S _{s_b} is within the pass band and the frequency of the transmission signal _{Sp_b} is outside the pass band, and is realized by, for example, an HPF.
The fourth filter 114 has an input terminal 114 a connected to the output terminal 111 d of the second signal synthesis unit 111, and an output terminal 114 b connected to the input terminal 33 a of the second conversion unit 33.
The fourth filter 114 suppresses the transmission signal _{Sp_b} included in the second combined signal generated by the second signal combining unit 111, and extracts the surge signal S _{s_b} from the second combined signal. , And outputs the surge signal _{Ss_b} to the second converter 33.

FIG. 11 is a configuration diagram illustrating the first synchronization signal generation unit 103 of the accident point locating device according to the third embodiment.
In FIG. 11, the phase comparator 121 is realized by, for example, a PFD (Phase Frequency Detector).
The phase comparator 121 compares the phase of the transmission signal _{Sp_a} extracted by the first filter 102 with the phase of the frequency- _divided signal output from the frequency divider 127, and compares the phase of the transmission signal _{Sp_a} with the frequency- _divided signal. Is output to the loop filter 122.
The loop filter 122 smoothes the phase difference signal output from the phase comparator 121 and outputs the smoothed phase difference signal to each of the voltage detector 124 and the switch 125.

The signal detector 123 performs a detection process of the transmission signal _{Sp_a} extracted by the first filter 102, and when the transmission signal _{Sp_a} cannot be detected, non-detection indicating that the transmission signal _{Sp_a} is interrupted. The signal is output to each of the voltage detector 124 and the switch 125.
The voltage detector 124 detects the voltage value of the smoothed phase difference signal output from the loop filter 122, and stores the detected voltage value.
When receiving the non-detection signal from the signal detector 123, the voltage detector 124 outputs the last stored voltage value to the switch 125 among the voltage values stored before receiving the non-detection signal.

When the non-detection signal is not output from the signal detector 123, the switch 125 outputs the smoothed phase difference signal output from the loop filter 122 to the voltage controlled oscillator 126 as a control voltage signal.
When receiving the non-detection signal from the signal detector 123, the switch 125 outputs the voltage value output from the voltage detector 124 to the voltage-controlled oscillator 126 as a control voltage signal.

The voltage controlled oscillator 126 generates _a first clock signal Ca based on the control voltage signal output from the switch 125, and divides the first clock signal _Ca into the frequency divider 127 and the first converter 23, respectively. Output to
Divider 127 divides the first clock signal C _a, which is generated by the voltage controlled oscillator 126, and outputs a divided signal of the first clock signal C _a to the phase comparator 121.
When the non-detection signal is not output from the signal detector 123, the phase comparator 121, the loop filter 122, the switch 125, the voltage controlled oscillator 126, and the frequency divider 127 operate as a PLL circuit.

FIG. 12 is a configuration diagram illustrating the second synchronization signal generation unit 113 of the accident point locating device according to the third embodiment.
In FIG. 12, the phase comparator 131 is realized by, for example, a PFD.
The phase comparator 131 compares the phase of the transmission signal _{Sp_b} extracted by the third filter 112 with the phase of the frequency- _divided signal output from the frequency divider 137, and compares the phase of the transmission signal _{Sp_b} with the frequency- _divided signal. Is output to the loop filter 132.
The loop filter 132 smoothes the phase difference signal output from the phase comparator 131 and outputs the smoothed phase difference signal to each of the voltage detector 134 and the switch 135.

The signal detector 133 performs detection processing of the transmission signal _{Sp_b} extracted by the third filter 112, and when the transmission signal _{Sp_b} cannot be detected, non-detection indicating that the transmission signal _{Sp_b} is interrupted. The signal is output to each of the voltage detector 134 and the switch 135.
The voltage detector 134 detects the voltage value of the smoothed phase difference signal output from the loop filter 132, and stores the detected voltage value.
When receiving the non-detection signal from the signal detector 133, the voltage detector 134 outputs to the switch 135 the last stored voltage value among the voltage values stored before receiving the non-detection signal.

When the non-detection signal is not output from the signal detector 133, the switch 135 outputs the smoothed phase difference signal output from the loop filter 132 to the voltage controlled oscillator 136 as a control voltage signal.
When the switch 135 receives the non-detection signal from the signal detector 133, the switch 135 outputs the voltage value output from the voltage detector 134 to the voltage control oscillator 136 as a control voltage signal.

Voltage controlled oscillator 136 generates a second clock signal C _b on the basis of a control voltage signal output from the switch 135, each of the second clock signal C _b a divider 137 and the second conversion unit 33 Output to
Divider 137 divides the second clock signal C _b generated by the voltage controlled oscillator 136, and outputs a frequency dividing signal of the second clock signal C _b to the phase comparator 131.
When no non-detection signal is output from the signal detector 133, the phase comparator 131, the loop filter 132, the switch 135, the voltage controlled oscillator 136, and the frequency divider 137 operate as a PLL circuit.

Next, the operation of the accident point locator shown in FIG. 10 will be described.
In the fault point locating device shown in FIG. 10, it is assumed that at least one of the transmission lines 2b and 2c is disconnected.
Further, other than the transmission line 2, it is assumed that the transmission delay of the transmission delay and the surge signal S _s of the transmission signal S _p is not generated.

When the surge signal S _s is generated due to damage to the transmission line 2, the first surge detection unit 100 detects the surge signal S _{s_a} in synchronization with the transmission signal _{Sp_a} flowing through the first point 11. To detect.
The first surge detector 100 converts the surge signal _{Ss_a} from an analog signal to a digital signal, and outputs the digital signal to the _fault point calculator 40 as _a first digital signal Da.
Hereinafter, the processing procedure of the first surge detection unit 100 will be specifically described.

The first signal combining unit 101 adds the voltages or currents of the three-phase AC signals flowing through the first point 11 in the three transmission lines 2a, 2b, and 2c in the same phase, thereby performing the first combining. Generate a signal.
First signal combining section 101 outputs the first combined signal to second filter 104.
Upon receiving the first combined signal from first signal combining section 101, second filter 104 suppresses transmission signal _{Sp_a} included in the first combined signal, and suppresses a surge from the first combined signal. The signal S _{s_a} is extracted and the surge signal S _{s_a} is output to the first converter 23.

The first filter 102 suppresses the surge signal S _{s_a} included in the signal flowing through the first point 11 in the transmission line 2a, and _{reduces the} transmission signal _{Sp_a} from the signal flowing through the first point 11. And outputs the transmission signal _{Sp_a} to the first synchronization signal generation unit 103.
Upon receiving the transmission signal _{Sp_a} from the first filter 102, the first synchronization signal generation unit 103 synchronizes with the transmission signal _{Sp_a} similarly to the first synchronization signal generation unit 22 illustrated in FIG. It generates a first clock signal C _a, and outputs the first clock signal C _a in the first conversion section 23.
However, when the transmission signal _{Sp_a} is not extracted by the first filter 102 and the output of the transmission signal _{Sp_a} from the first filter 102 is stopped, the first synchronization signal generation unit 103 outputs the transmission signal _{Sp_a} . outputting a first clock signal C _a generated before the interrupted in the first converter 23.
Hereinafter, the processing procedure of the first synchronization signal generation unit 103 will be specifically described.

When receiving the transmission signal _{Sp_a} from the first filter 102, the phase comparator 121 compares the phase of the transmission signal _{Sp_a with} the phase of the frequency- _divided signal output from the frequency divider 127.
The phase comparator 121 outputs a phase difference signal indicating a phase difference between the transmission signal _{Sp_a} and the frequency- _divided signal to the loop filter 122.
Upon receiving the phase difference signal from the phase comparator 121, the loop filter 122 smoothes the phase difference signal and outputs the smoothed phase difference signal to each of the voltage detector 124 and the switch 125.

The signal detector 123 performs a process of detecting the transmission signal _{Sp_a} extracted by the first filter 102.
When the transmission signal _{Sp_a} is not extracted by the first filter 102 and the transmission signal _{Sp_a} cannot be detected by the first filter 102, the signal detector 123 outputs a non-detection signal indicating that the transmission signal _{Sp_a} is interrupted to a voltage detector. 124 and the switch 125.

The voltage detector 124 detects the voltage value of the smoothed phase difference signal output from the loop filter 122, and stores the detected voltage value.
When receiving the non-detection signal from the signal detector 123, the voltage detector 124 outputs the last stored voltage value to the switch 125 among the voltage values stored before receiving the non-detection signal.

When the non-detection signal is not output from the signal detector 123, the switch 125 outputs the smoothed phase difference signal output from the loop filter 122 to the voltage controlled oscillator 126 as a control voltage signal.
When receiving the non-detection signal from the signal detector 123, the switch 125 outputs the voltage value output from the voltage detector 124 to the voltage-controlled oscillator 126 as a control voltage signal.

Voltage controlled oscillator 126 receives a control voltage signal from the switch 125, the control based on the voltage signal to generate a first clock signal C _a, the first clock signal C _a divider 127 and the first conversion Output to each of the units 23.
Divider 127 receives the first clock signal _{C a} voltage controlled oscillator 126, a first clock signal _{C a} divides the phase comparator divided signal of the first clock signal _{C a} 121 Output to

When the non-detection signal is not output from the signal detector 123, the phase comparator 121, the loop filter 122, the switch 125, the voltage controlled oscillator 126, and the frequency divider 127 operate as a PLL circuit.
Here, it is assumed that at least one of the transmission lines 2b and 2c is disconnected, and the transmission signal _Sp flows through the transmission line 2a.
Therefore, since the signal detector 123 detects the transmission signal _{Sp_a} , the signal detector 123 does not output a non-detection signal to each of the voltage detector 124 and the switch 125.
Therefore, the voltage controlled oscillator 126, a first clock signal C _a corresponding to the phase difference between the transmission signal S _{p_a} and the division signal is generated.

If the transmission line 2a is disconnected and the transmission signal _{Sp_a} does not flow through the transmission line 2a, the signal detector 123 does not detect the transmission signal _{Sp_a} and the non-detection signal from the signal detector 123 is detected by voltage detection. Output to each of the switch 124 and the switch 125.
Therefore, in the voltage controlled oscillator 126, the first clock signal _Ca is generated by the voltage detector 124 based on the last stored voltage value among the voltage values stored before receiving the non-detection signal. Generated.
Therefore, the transmission line 2a is cut, even if the transmission signal S _{p_a} is no longer flows through the transmission line 2a, it is possible to continue the generation of the first clock signal C _a.

First converting section 23 receives the surge signal _{S s_a} from the second filter 104, the the first synchronizing signal generator 103 receives the first clock signal _{C a,} similarly to the first embodiment, the in synchronization with the first clock signal C _a, it converts the analog signal which is a surge signal S _{s_a} into a digital signal.
The first converter 23 outputs the digital signal to the accident point calculator 40 as _a first digital signal Da.

Second surge detecting unit 110, when a surge signal S _s by damage to the transmission line 2 has occurred, in synchronization with the transmission signal S _{p_b} flowing through the second point 12, a surge signal S _{S_B} To detect.
Second surge detecting unit 110, a surge signal S _{S_B} converted from an analog signal to a digital signal, and outputs the digital signal to the fault point calculating section 40 as the second digital signal D _b.
Hereinafter, the processing procedure of the second surge detection unit 110 will be specifically described.

The second signal synthesizing unit 111 adds the voltages or currents of the three-phase alternating current signals flowing at the second point 12 in the three transmission lines 2a, 2b, and 2c in the same phase, thereby performing the second synthesis. Generate a signal.
The second signal synthesizing section 111 outputs the second synthesized signal to the fourth filter 114.
When receiving the second combined signal from second signal combining section 111, fourth filter 114 suppresses transmission signal _{Sp_b} included in the second combined signal, and suppresses surge from the second combined signal. The signal S _{s_b} is extracted, and the surge signal S _{s_b} is output to the second converter 33.

The third filter 112 suppresses the surge signal S _{s_b} included in the signal flowing through the second point 12 in the transmission line 2a, and _{converts the} signal flowing through the second point 12 into the transmission signal _{Sp_b.} And outputs the transmission signal _{Sp_b} to the second synchronization signal generation unit 113.
Second synchronizing signal generating unit 113 receives the transmission signal _{S p_b} from the third filter 112, as with the second synchronizing signal generating unit 32 shown in FIG. 1, the synchronized with the transmission signal _{S p_b} It generates a second clock signal C _b, and outputs the second clock signal C _b to the second converter 33.
However, when the transmission signal _{Sp_b} is no longer extracted by the third filter 112 and the output of the transmission signal _{Sp_b} from the third filter 112 stops, the second synchronization signal generation unit 113 outputs the transmission signal _{Sp_b} . outputting a second clock signal C _b generated before the interrupted in the second converter 33.
Hereinafter, the processing procedure of the second synchronization signal generation unit 113 will be specifically described.

_Upon receiving the transmission signal _{Sp_b} from the third filter 112, the phase comparator 131 compares the phase of the transmission signal _{Sp_b with} the phase of the frequency- _divided signal output from the frequency divider 137.
The phase comparator 131 outputs a phase difference signal indicating a phase difference between the transmission signal _{Sp_b} and the frequency- _divided signal to the loop filter 132.
Upon receiving the phase difference signal from the phase comparator 131, the loop filter 132 smoothes the phase difference signal and outputs the smoothed phase difference signal to each of the voltage detector 134 and the switch 135.

The signal detector 133 _performs a process of detecting the transmission signal _{Sp_b} extracted by the third filter 112.
When the transmission signal _{Sp_b} is not extracted by the third filter 112 and the transmission signal _{Sp_b} cannot be detected by the third filter 112, the signal detector 133 outputs a non-detection signal indicating that the transmission signal _{Sp_b} is interrupted to a voltage detector. 134 and the switch 135.

The voltage detector 134 detects the voltage value of the smoothed phase difference signal output from the loop filter 132, and stores the detected voltage value.
When receiving the non-detection signal from the signal detector 133, the voltage detector 134 outputs to the switch 135 the last stored voltage value among the voltage values stored before receiving the non-detection signal.

When the non-detection signal is not output from the signal detector 133, the switch 135 outputs the smoothed phase difference signal output from the loop filter 132 to the voltage controlled oscillator 136 as a control voltage signal.
When the switch 135 receives the non-detection signal from the signal detector 133, the switch 135 outputs the voltage value output from the voltage detector 134 to the voltage control oscillator 136 as a control voltage signal.

Voltage controlled oscillator 136 receives a control voltage signal from the switch 135, the control second to generate a clock signal C _b based on the voltage signal, the second clock signal C _b divider 137 and the second conversion Output to each of the units 33.
Divider 137 receives the second clock signal _{C b} from the voltage controlled oscillator 136, the second clock signal _{C b} divides the second clock signal _{C b} of the divided signal to the phase comparator 131 Output to

When no non-detection signal is output from the signal detector 133, the phase comparator 131, the loop filter 132, the switch 135, the voltage controlled oscillator 136, and the frequency divider 137 operate as a PLL circuit.
Here, it is assumed that at least one of the transmission lines 2b and 2c is disconnected, and the transmission signal _Sp flows through the transmission line 2a.
Therefore, since the signal detector 133 detects the transmission signal _{Sp_b} , the signal detector 133 does not output a non-detection signal to each of the voltage detector 134 and the switch 135.
Therefore, the voltage controlled oscillator 136, the second clock signal C _b corresponding to the phase difference between the transmission signal S _{p_b} and the division signal is generated.

If the transmission line 2a is disconnected and the transmission signal _{Sp_b} does not flow through the transmission line 2a, the signal detector 133 does not detect the transmission signal _{Sp_b} , and a non-detection signal is detected from the signal detector 133. Output to each of the switch 134 and the switch 135.
Accordingly, the voltage controlled oscillator 136, the voltage detector 134, among the voltage values stored prior to receiving the non-detection signal, the second clock signal C _b on the basis of the voltage value last stored is Generated.
Therefore, the transmission line 2a is cut, even if the transmission signal S _{p_b} is no longer flows through the transmission line 2a, it is possible to continue the generation of the second clock signal C _b.

The second converter 33 receives the surge signal _{S S_B} from the fourth filter 114, the second synchronizing signal generator 113 receives the second clock signal _{C b,} as in the first embodiment, the in synchronism with the second clock signal C _b, it converts the analog signal which is a surge signal S _{S_B} to a digital signal.
The second conversion unit 33 outputs the digital signal to the fault point calculating section 40 as the second digital signal D _b.

Fault point calculation unit 40, as in the first embodiment, the second digital signal D _b output from the first digital signal D _a and the second converter 33 which is outputted from the first converter 23 Then, the fault point 13 of the transmission line 2 is calculated.

Thus, the fault point locating system of the third embodiment, the transmission line 2 3 transmission lines 2a, 2b, has a 2c, transmission signal S _p to be transmitted by the transmission line 2, three-phase AC Can be calculated without transmitting or receiving voltage information or the like via the communication line.

In the present invention, any combination of the embodiments, a modification of an arbitrary component of each embodiment, or an omission of an arbitrary component in each embodiment is possible within the scope of the invention. .

The present invention is suitable for an accident point locating apparatus and an accident point locating method for calculating an accident point which is a damaged position of a transmission line.

1, 2 transmission line, 2a, 2b, 2c transmission line, 11 first point, 12 second point, 13 fault point, 20 first surge detector, 20a input terminal, 20b, 20c output terminal, 21st 1 signal separation unit, 21a input terminal, 21b first output terminal, 21c second output terminal, 22 first synchronization signal generation unit, 22a input terminal, 22b output terminal, 23 first conversion unit, 23a input Terminal, 23b clock terminal, 23c output terminal, 24 first trigger signal generator, 24a input terminal, 24b output terminal, 30 second surge detector, 30a input terminal, 30b, 30c output terminal, 31 second signal Separation unit, 31a input terminal, 31b first output terminal, 31c second output terminal, 32 second synchronization signal generation unit, 32a input terminal , 32b 、 output terminal, 33 second conversion unit, 33a input terminal, 33b clock terminal, 33c output terminal, 34 second trigger signal generation unit, 34a input terminal, 34b output terminal, 40 accident point calculation unit, 40a first Input terminal, 40b second input terminal, 51 first filter, 52 second filter, 53 third filter, 54 fourth filter, 61 phase difference detection unit, 62 angular frequency detection unit, 63 injury point Calculation processing unit, 71 first transmission line, 72 second transmission line, 73 third transmission line, 74 fourth transmission line, 80 accident point calculation unit, 80a first input terminal, 80b second input Terminal, 80 c third input terminal, 80 d ４ fourth input terminal, 81 first time difference calculator, 82 ２second time difference calculator, 83 accident point calculation processor 100 {first surge detector, 100a, 100b, 100c input terminals, 100d} output terminal, 101 first signal synthesizer, 101a, 101b, 101c input terminals, 101d output terminal, 102 first filter, 102a input terminal, 102b output terminal, 103 first synchronization signal generator, 103a input terminal, 103b output terminal, 104 second filter, 104a input terminal, 104b output terminal, 110 second surge detector, 110a, 110b, 110c input terminal , 110d output terminal, 111 second signal synthesis unit, 111a, 111b, 111c ， input terminal, 111d output terminal, 112 third filter, 112a input terminal, 112b output terminal, 113 second synchronization signal generation unit, 113a input Terminal, 113 b output terminal, 114 fourth filter, 114a input terminal, 114b output terminal, 121 phase comparator, 122 loop filter, 123 signal detector, 124 voltage detector, 125 switch, 126 voltage controlled oscillator, 127 frequency divider, 131 phase comparator, 132 loop filter, 133 signal detector, 134 voltage detector, 135 switch, 136 voltage controlled oscillator, 137 frequency divider.

Claims (9)

1. One end is connected to a first point in a transmission line that transmits power as a transmission signal, and when a surge signal occurs due to damage to the transmission line, the transmission signal flowing through the first point is A first surge detector that detects the surge signal in synchronization with the first surge detector;
   A second surge detector that has one end connected to a second point on the transmission line different from the first point, and detects the surge signal in synchronization with a transmission signal flowing through the second point; Department and
   An accident point calculation unit that calculates an accident point that is a damage position of the transmission line from a surge signal detected by the first surge detection unit and a surge signal detected by the second surge detection unit. Accident point locator.
2. The first surge detection unit includes:
   A first signal separation unit that extracts each of a transmission signal and a surge signal from a signal flowing through the first point;
   A first synchronization signal generation unit that generates a first clock signal synchronized with the transmission signal extracted by the first signal separation unit;
   Synchronizing with the first clock signal generated by the first synchronizing signal generation unit, the surge signal extracted by the first signal separation unit is converted from an analog signal to a digital signal, and the digital signal is converted to a digital signal. A first conversion unit that outputs the digital signal as one digital signal to the accident point calculation unit,
   The second surge detection unit includes:
   A second signal separation unit that extracts each of a transmission signal and a surge signal from the signal flowing through the second point;
   A second synchronization signal generator that generates a second clock signal synchronized with the transmission signal extracted by the second signal separator;
   In synchronization with the second clock signal generated by the second synchronization signal generation unit, the surge signal extracted by the second signal separation unit is converted from an analog signal to a digital signal, and the digital signal is converted to a digital signal. A second conversion unit that outputs the digital signal to the accident point calculation unit as a second digital signal,
   The fault point calculation unit detects a phase difference between a first digital signal output from the first conversion unit and a second digital signal output from the second conversion unit, and calculates a phase difference from the phase difference. The accident point locating device according to claim 1, wherein the accident point is calculated.
3. The first signal separation unit includes:
   A first filter that extracts a transmission signal from the signal flowing through the first point and outputs the extracted transmission signal to the first synchronization signal generation unit;
   A second filter that extracts a surge signal from the signal flowing through the first point and outputs the extracted surge signal to the first conversion unit;
   The second signal separation unit includes:
   A third filter that extracts a transmission signal from the signal flowing through the second point and outputs the extracted transmission signal to the second synchronization signal generation unit;
   3. The apparatus according to claim 2, further comprising: a fourth filter configured to extract a surge signal from the signal flowing through the second point, and to output the extracted surge signal to the second converter. Accident point locator.
4. The accident point calculation unit,
   Detecting an angular frequency of a first digital signal output from the first conversion unit or an angular frequency of a second digital signal output from the second conversion unit; The accident point locating device according to claim 2, wherein the accident point is calculated.
5. The first surge detection unit includes:
   A first trigger signal generator that generates a first trigger signal synchronized with the transmission signal extracted by the first signal separator;
   The second surge detection unit includes:
   A second trigger signal generation unit that generates a second trigger signal synchronized with the transmission signal extracted by the second signal separation unit;
   A first transmission line that delays the first digital signal output from the first conversion unit by a first delay time and transmits the first digital signal to the fault point calculation unit;
   A second transmission line that delays the first trigger signal generated by the first trigger signal generation unit by the first delay time and transmits the signal to the fault point calculation unit;
   A third transmission line that delays the second digital signal output from the second conversion unit by a second delay time and transmits the second digital signal to the fault point calculation unit;
   A fourth transmission line that delays the second trigger signal generated by the second trigger signal generation unit by the second delay time and transmits the signal to the fault point calculation unit;
   The accident point calculation unit,
   A first digital signal transmitted by the first transmission line, a first trigger signal transmitted by the second transmission line, and a second digital signal transmitted by the third transmission line. 3. The fault point locating apparatus according to claim 2, wherein the fault point is calculated from a second trigger signal transmitted by the fourth transmission line.
6. The accident point calculation unit,
   A first time difference which is a time difference between a rising time of a first digital signal transmitted by the first transmission line and a rising time of a first trigger signal transmitted by the second transmission line is calculated. A first time difference calculating unit for calculating,
   A second time difference which is a time difference between a rising time of a second digital signal transmitted through the third transmission line and a rising time of a second trigger signal transmitted through the fourth transmission line is calculated. A second time difference calculating unit for calculating,
   An accident point calculation processing unit that calculates the accident point from a first time difference calculated by the first time difference calculation unit and a second time difference calculated by the second time difference calculation unit The accident point locating device according to claim 5, comprising:
7. The transmission line has three transmission lines, a transmission signal transmitted by the transmission line is a three-phase AC signal,
   The first surge detection unit includes:
   A first signal combining unit that combines the three-phase AC signals flowing through the first point to generate a first combined signal;
   A first filter for extracting a transmission signal from a signal flowing at the first point in any one of the three transmission lines;
   A first synchronization signal generation unit that generates a first clock signal synchronized with the transmission signal extracted by the first filter;
   A second filter for extracting a surge signal from the first combined signal generated by the first signal combining unit;
   The surge signal extracted by the second filter is converted from an analog signal to a digital signal in synchronization with a first clock signal generated by the first synchronization signal generation unit, and the digital signal is converted to a first signal. A first conversion unit that outputs a digital signal to the accident point calculation unit,
   The second surge detection unit includes:
   A second signal combining unit that combines the three-phase AC signals flowing through the second point to generate a second combined signal;
   A third filter for extracting a transmission signal from a signal flowing through the second point in any one of the three transmission lines;
   A second synchronization signal generator that generates a second clock signal synchronized with the transmission signal extracted by the third filter;
   A fourth filter for extracting a surge signal from the second combined signal generated by the second signal combining unit;
   The surge signal extracted by the fourth filter is converted from an analog signal to a digital signal in synchronization with the second clock signal generated by the second synchronization signal generation unit, and the digital signal is converted to a second signal. A second conversion unit that outputs a digital signal to the accident point calculation unit,
   The fault point calculation unit detects a phase difference between a first digital signal output from the first conversion unit and a second digital signal output from the second conversion unit, and calculates a phase difference from the phase difference. The accident point locating device according to claim 1, wherein the accident point is calculated.
8. The first synchronization signal generation unit includes:
   When the transmission signal is no longer extracted by the first filter and the output of the transmission signal from the first filter is interrupted, the first clock signal generated before the output of the transmission signal is interrupted is converted to the first converter. Output to
   The second synchronization signal generation unit includes:
   When the transmission signal is no longer extracted by the third filter and the output of the transmission signal from the third filter is interrupted, the second clock signal generated before the output of the transmission signal is interrupted is converted to the second converter. 8. The accident point locating device according to claim 7, wherein the signal is output to a vehicle.
9. A first surge detector, one end of which is connected to a first point in a transmission line that transmits power as a transmission signal, is configured such that when a surge signal is generated due to damage to the transmission line, the first point is detected. In synchronization with the transmission signal flowing through, the surge signal is detected,
   A second surge detector, one end of which is connected to a second point different from the first point on the transmission line, synchronizes the surge signal with a transmission signal flowing through the second point. Detect
   An accident point calculation unit calculates an accident point, which is a damaged position of the transmission line, from a surge signal detected by the first surge detection unit and a surge signal detected by the second surge detection unit. Point location method.

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