JP2001215248A - Phase detecting system, for power transmission/ distribution line - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a phase detecting system for a power transmission/ distribution line capable of detecting phases being the same at two arbitrary points on the line. SOLUTION: A power reception/distribution system is equipped with daughter stations 1a, 1b provided at two specific points on the power transmission/ distribution line 4 and a mother station 2 connected to the daughter stations 1 by communication lines 3. The mother station 2 receives zero-crossing times of respective phases detected by the stations 1a, 1b and compares them with each other to detect the phases being the same. This enables the phases to be detected being the same at two arbitrary points on the line 4. By using this phase detecting system for a power transmission/distribution line, load connection enabling load to be shared among the phases can be easily performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission and distribution line phase detection system. More specifically, the present invention relates to a transmission and distribution line phase detection system capable of detecting the same phase at any two points on the transmission and distribution line.

[0002]

2. Description of the Related Art Transmission lines and distribution lines (hereinafter, collectively referred to as "transmission and distribution lines") are usually provided with three-phase alternating current, and therefore have three (four if a neutral line is included). Tracks are required. The phase voltage of these lines is a 60 Hz or 50 Hz sine wave with each phase having a phase difference of 2 / 3π.

[0003] Loads connected to transmission and distribution lines include single-phase loads and three-phase loads. It is not preferable that these loads are unbalancedly connected to a specific line of the transmission and distribution line because an unbalanced voltage is generated. Therefore, it is necessary to level and connect each line so that a load is evenly applied to each line. However, as a result of twisting the transmission and distribution line, it may not be possible to determine which line is in which phase.

[0004] Further, when construction is performed on a transmission and distribution line, it is necessary to make connections so that phases are not mixed. However, it is not easy to determine which line is which phase, and it is common to connect such that the phase difference rotates in the same direction. As an example of this, there is JP-A-62-60434. In these methods, a phase difference is obtained by comparing the waveforms between the lines at a certain point to determine the rotation direction of the waveform at two points on the transmission and distribution line and comparing the rotation directions. .

[0005]

However, the method for determining the phase difference does not always determine a line having the same phase between two points, but only a combination of lines having the same rotation. Can not do. The present invention solves such a problem, and relates to a transmission and distribution line phase detection system that can obtain transmission and distribution lines having the same phase at any two points.

[0006]

According to a first aspect of the present invention, there is provided a transmission / distribution line phase detecting system comprising two slave stations each including a zero-crossing time detecting means, a clocking means, and a zero-crossing time transmitting means; A transmission / distribution line phase detection system comprising: a master station including a display unit; and each of the slave stations is connected to any two points of the transmission / distribution line, and the timing unit measures a reference time. The zero-cross time detecting means obtains a zero-cross time at which the phase voltage of each phase at each point becomes zero from the reference time, and the zero-cross time transmitting means transmits the zero-cross time to the master station. The station is connected to each of the slave stations via a communication line, the receiving means receives the zero cross time, the processing means detects the same phase between the slave stations from the zero cross time, and the display means Display the same phase, and The phase is detected by comparing the zero-cross time of each phase of one of the slave stations with the zero-cross time of each phase of the other slave station, and determining the phase having the smallest time difference as the same phase. It is characterized by.

[0007] The "zero crossing time" is the time when the phase voltage becomes zero in a certain phase of the transmission and distribution line. Also,
In the process in which the phase voltage becomes zero, there are cases where the potential becomes zero from the positive potential side and cases where the phase voltage becomes zero from the negative potential side. In the present invention, both can be used as the zero crossing time, Only one of them can be used.

In the transmission and distribution lines, leading or lagging occurs in some or all of the lines due to various factors, so that the waveforms in the same phase between two points may not completely match. Therefore, in the present invention, the waveform having the “minimum time difference” is regarded as the same phase. The range considered to be the least is preferably within ± 18 ° (particularly preferably ± 15 °, more preferably ± 10 °) in phase angle for both the leading and lagging phases. If the ratio is out of this range, another phase may be regarded as the same phase, which is not preferable. In addition, if this range is referred to as a time difference, if the frequency of the transmission and distribution line is 60 Hz, ±
0.83 ms (± 0.69 ms, ± 0.46 ms), 5
± 1.0 ms at 0 Hz (± 0.83 ms, ± 0.56
ms).

A transmission / distribution line phase detection system according to a second aspect of the present invention includes two slave stations each including a phase voltage detecting means, a timing means, and a phase voltage transmitting means, and a master station including a receiving means, a processing means, and a display means. Wherein each of the slave stations is respectively connected to any two points of the transmission and distribution line, the timing unit measures a reference time, and the phase voltage detection unit includes The phase voltage at each point at a specific time obtained by the clocking means is determined, the phase voltage transmitting means transmits the specific time and the phase voltage to the master station, and the master station communicates with each slave station via a communication line. Connected, the receiving means receives the specific time and the phase voltage, the processing means detects the same phase between the slave stations based on the specific time and the phase voltage, and the display means detects the same phase. Display, and the same phase detection At the specific time, the phase voltage of each phase of one slave station is compared with the phase voltage of each phase of the other slave station, and the phase having the smallest phase difference is determined to be the same phase. Features.

In the second invention, the range considered as the "smallest phase difference" is a phase angle of ± 18 ° (particularly preferably ± 15 °, more preferably ± 10 °) for both the leading phase and the lagging phase as in the first invention. °) is preferred.

[0011] As shown in the third aspect of the present invention, each of the above-mentioned slave stations has a G
A GPS receiving means for receiving a PS radio wave and specifying a current time held by the GPS is provided, and the current time held by the GPS can be synchronized with the reference time. Further, as shown in a fourth invention, each of the above-mentioned slave stations can be formed integrally with a construction switch.

The means for determining the phase voltage of each phase can be arbitrarily selected. An example of this is an instrument transformer (VT).
Or a device such as a high-voltage capacitor (VD). The "communication line" can be selected from any means. For example, whether wired or wireless is used. In addition, a dedicated line for transmitting only signals necessary for the present invention such as a zero crossing time and a phase voltage may be used, or a public line network such as a telephone line may be used.

The above-mentioned master station and the above-mentioned slave stations are distinguished for the sake of explanation. In this transmission / distribution line phase detecting system, the above-mentioned master station and the above-mentioned slave stations are independent devices. Alternatively, the master station and one slave station may be an integrated device. Further, a device in which the master station and each slave station are integrated may be used.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a transmission and distribution line phase detection system according to the present invention will be described below with reference to FIGS. [Embodiment 1] Embodiment 1 corresponds to the first invention, and is a transmission / distribution line phase detection system for detecting the same phase using the zero crossing time. As shown in FIG. 1, the transmission and distribution line phase detection system includes slave stations 1a and 1b provided at specific two points A and B on the transmission and distribution line 4 (hereinafter, 1a and 1b are collectively abbreviated as 1).
And a master station 2 connected to each slave station 1 and a communication line 3.

(1) Slave Station 1 Each slave station 1 is connected in parallel with a section switch 41 provided in the transmission and distribution line 4 as shown in FIG. 2, for example. Also,
Each slave station 1 includes a construction switch 11 and a slave station body 12. The construction switch 11 includes a switch body 111 and a VD 112 as shown in FIG. Further, as shown in FIG. 4, the slave station main body 12 includes a filter circuit 131, a zero cross point detection circuit 132, a zero cross time holding circuit 133, a signal level detection circuit 134, and a communication interface 14.
1, communication antenna 122, oscillation circuit 151, reference clock 1
52, a time synchronization correction circuit 153, a GPS receiver 161,
A GPS antenna 123 and a signal processing circuit 121 are provided.

The VD 112 and the filter circuit 13
1. A part of the zero-crossing point detecting circuit 132, the zero-crossing time holding circuit 133, the signal level detecting circuit 134, and a part of the signal processing circuit 121 correspond to the "zero-crossing time detecting means 13." Further, the signal processing circuit 121, the communication interface 141, and the communication antenna 122 correspond to the “zero-crossing time transmitting unit 14”.

Further, an oscillation circuit 151, a reference clock 152,
In addition, the time synchronization correction circuit 153 corresponds to “time measuring means”. In addition, the GPS receiver 161 and the GPS antenna 12
3 corresponds to “GPS receiving means”. The zero-crossing time detecting means 13 includes three systems, and each system detects a zero-crossing time in each phase of the transmission and distribution line.

Hereinafter, the components of the slave station 1 will be described. (I) Switch body 111 The switch body 111 is a switch that opens and closes the transmission and distribution line for construction, and uses any commonly used switch. (Ii) VD112 The VD112 is connected to each line of the transmission and distribution line 4, detects the voltage of each line via a high-voltage capacitor, and sends it to the filter circuit 131.

(Iii) Filter Circuit 131 The filter circuit 131 extracts a phase voltage which is a commercial frequency component (60 Hz or 50 Hz) as shown in FIG. 6 by removing components such as noise from the signal obtained from the VD 112. Then, it is sent to the zero cross point detection circuit 132 and the signal level detection circuit 134. (Iv) Zero-crossing point detection circuit 132 It is determined whether or not the phase voltage obtained by the filter circuit 131 becomes zero. As shown in FIG. 7, when the phase voltage becomes zero, the time holding signal is sent to the zero-crossing time holding circuit. Output.

(V) Zero crossing time holding circuit 133 When a time holding signal is received from the zero crossing point detecting circuit 132, the time obtained from the reference clock 152 at that time is held, and this time is stored as shown in FIG. Zero crossing time T _aA ,
T _aB, and outputs to the signal processing circuit 121 as a T _aC like. (Vi) Signal Level Detection Circuit 134 The signal level detection circuit 134 detects whether the phase voltage received from the filter circuit 131 satisfies a prescribed voltage level, and if so, sends a transmission permission signal to the signal processing circuit 121. Output. This is because the phase cannot be correctly determined even if the phase is detected when the phase voltage does not satisfy the specified voltage level.

(Vii) Communication Interface 141 and Communication Antenna 122 The communication interface 141 processes the zero-crossing time output from the signal processing circuit 121 into a form that can be wirelessly transmitted by the communication line 3, and passes through the communication antenna 122. To the master station 2.

(Viii) Oscillation circuit 151 A reference time signal for measuring the reference time is supplied to the reference clock 15.
Output to 2. (Ix) Reference clock 152 The reference clock sequentially corrected by the time synchronization correction circuit 153 is clocked, and the clocked reference time is output to the zero cross time holding circuit 133. (X) Time synchronization correction circuit 153 According to the synchronization signal output from GPS receiver 161,
The time of the reference clock 152 is synchronized with the standard time held by the GPS satellite.

(Xi) GPS antenna 123 and GPS receiver 161 The GPS antenna 123 receives a radio wave from a GPS satellite and sends it to the GPS receiver 161. And GPS
The receiver 161 extracts standard time information held by the GPS satellite from the received radio wave as a synchronization signal, and outputs the synchronization signal to the time synchronization correction circuit 153. (Xii) The signal processing circuit 121 receives the zero crossing time output from the zero crossing time holding circuit 133 and the transmission permission signal output from the signal level detection circuit 134, and performs zero crossing only during a period in which the transmission permission signal is output. The time is output to the communication interface 141.

(2) Master station 2 As shown in FIG.
2, a display unit 23 and a storage unit 24. The receiving means 21 includes a communication antenna 212 and a communication interface 211. Also, the communication interface 211
Converts the radio wave of each slave station 1 received by the communication antenna 212 into a zero-crossing time and sends it to the processing means 22.

The processing means 22 comprises a central processing unit 22 comprising a personal computer, a microcomputer or the like.
1 is provided. Further, the central processing unit 221 includes the receiving unit 2
Then, the zero crossing time of each slave station 1 received by 1 is compared for each phase, the phase having the smallest time difference is determined to be the same phase, and the phase detection result is output to the display means 23 and the storage means 24.

The display means 23 includes a liquid crystal display 231
And a printer 232, and displays the phase detection result obtained by the processing means 22. The storage means 24 is an auxiliary storage device 24 composed of a hard disk, a semiconductor memory, and the like.
1 for storing programs, phase detection results, and the like.

(3) Communication Line 3 As the communication line 3, an existing public wireless network such as a PHS or a mobile phone was used.

2. Phase detection method Hereinafter, the phase detection by the transmission and distribution line phase detection system of the first embodiment will be described.
One phase detection method will be described. Each of the slave stations 1a and 1b transmits
The time when the phase voltage of the distribution line becomes zero is defined as a zero cross time T. _aA,
T_aB, T_aC, T_bA, T_bB, T_bC(See Figure 7)
), And send it to master station 2. In the master station 2, each of the slave stations 1a and 1b
Therefore, the detected zero-cross of each phase A, B, C (see FIG. 6)
Time T_aA, T_aB, T_aC, T_bA, T_bB, T_bC(See Figure 7
The same phase is detected by receiving
I do. First, as shown in FIG.
Loss time T_{a A}And the zero crossing time T of each phase of the slave station 1b_bA,
T_bB, T_bCAnd the one with the least time difference
And the time difference is within the allowable range (power transmission frequency is 60H
± 0.83ms for z, ± 1.0ms for 50Hz
It is. The phases that fit in ()) are the same phase.

In the B and C phases of the slave station 1a,
Similarly to the A phase, the zero crossing time T _bA of each phase of the slave station 1b,
The same phase is determined by comparing with T _bB and T _bC .
Furthermore, when any of the phases cannot determine the same phase, or when the determined same phases overlap (for example, it is determined that the A and B phases of the slave station 1a are the same as the C phase of the slave station 1b). Is handled as detection failure. The cause of the detection failure may be an abnormality in the detection device, a connection abnormality on the distribution line, or the like.

3. Operation method of transmission / distribution line phase detection system Such a transmission / distribution line phase detection system according to the first embodiment includes:
Perform the following operations. First, as shown in FIGS. 1 and 2,
The arbitrary two-way switch 41 provided on the transmission and distribution line 4 and the main station 1 are connected in parallel and fixed to a utility pole or the like. Further, the master station 2 disposed in a work vehicle or the like is operated to receive radio waves transmitted from the slave station 1.

Each of the connected slave stations 1 is a GPS receiving means 1
6, the reference clock 152 based on the GPS time received by
And the zero cross time obtained by the zero cross time detecting means 13 is transmitted to the master station 2. The master station 2 receives the zero crossing time sent from each slave station 1 by the receiving means 21, and The same phase is detected by using the method shown in the phase detection method, and the phase detection result is displayed by the display means 23.

3. Effects of the Transmission and Distribution Line Phase Detection System The transmission and distribution line phase detection system according to the first embodiment can detect the same phase between any two points on the transmission and distribution line. Therefore, by using the present transmission and distribution line phase detection system, it is possible to easily perform a load connection that can share the load of each phase. Further, since the zero cross time used for the phase detection is based on the reference time corrected by the GPS, accurate phase detection can be performed. Further, since each slave station 1 is integrated with the construction switch 11, connection is easy, and a new connection is made to the transmission and distribution line 4 in order to perform phase detection.
No need to do.

Embodiment 2 Embodiment 2 corresponds to the second invention and is a transmission / distribution line phase detection system for detecting the same phase by using a phase voltage at a specific time. As shown in FIG. 9, the transmission / distribution line phase detection system includes a specific 2
Slave stations 1a and 1b provided at points A and B (hereinafter, 1a and 1b)
b is collectively abbreviated as 1), and each slave station 1 and a master station 5 connected by a communication line 3.

(1) Slave Station 1 Each slave station 1 is connected in parallel with a section switch 41 provided in the transmission and distribution line 4 as shown in FIG. 2, for example. Also,
Each slave station 1 includes a construction switch 11 and a slave station body 12. The construction switch 11 includes a switch body 111 and a VD 112 as shown in FIG. Further, as shown in FIG. 10, the slave station body 12 includes a filter circuit 171, a phase voltage measurement circuit 172, a phase voltage holding circuit 173, a signal level detection circuit 174, a communication interface 181, a communication antenna 122, an oscillation circuit 151, and a reference clock. 152, a time synchronization correction circuit 153, a GPS receiver 161, a GPS antenna 123, and a signal processing circuit 121.

The VD 112 and the filter circuit 17
1. The phase voltage measuring circuit 172, the phase voltage holding circuit 173, the signal level detecting circuit 174, and a part of the signal processing circuit 121 correspond to the “phase voltage detecting means 17”. Further, the signal processing circuit 121, the communication interface 181, and the communication antenna 122 correspond to the "phase voltage etc. transmitting means 18".

Further, an oscillation circuit 151, a reference clock 152,
In addition, the time synchronization correction circuit 153 corresponds to “time measuring means”. In addition, the GPS receiver 161 and the GPS antenna 12
3 corresponds to “GPS receiving means”. The phase voltage detecting means 17 includes three systems, each of which detects a phase voltage in each phase of the transmission and distribution line.

Hereinafter, the components of the slave station 1 will be described. (I) Switch body 111 The switch body 111 is a switch that opens and closes the transmission and distribution line for construction, and uses any commonly used switch. (Ii) VD112 The VD112 is connected to each line of the transmission and distribution line 4, detects the voltage of each line via a high-voltage capacitor, and sends it to the filter circuit 171.

(Iii) Filter circuit 171 The filter circuit 171 extracts a phase voltage which is a commercial frequency component (60 Hz or 50 Hz) as shown in FIG. 6 by removing components such as noise from the signal obtained from the VD 112. Then, the signal is sent to the phase voltage measuring circuit 172 and the signal level detecting circuit 174. (Iv) Phase voltage measurement circuit 172 Obtains the phase voltage obtained from the filter circuit 171 and outputs it to the phase voltage holding circuit 173.

[0039] (v) phase when the reference time obtained from the voltage holding circuit 173 the reference clock 152 is a specific time T _x, as shown in FIG. 12, the phase voltage measurement circuit 172
More resulting phase voltages E _aA, E _aB, holds E _aC or the like, and outputs the phase voltage E _aA, E _aB, the E _aC etc. and specific time T _x to the signal processing circuit 121. (Vi) Signal Level Detection Circuit 174 The signal level detection circuit 174 detects whether or not the phase voltage received from the filter circuit 171 satisfies a prescribed voltage level, and if so, sends a transmission permission signal to the signal processing circuit 121. Output. This is because the phase cannot be correctly determined even if the phase is detected when the phase voltage does not satisfy the specified voltage level.

(Vii) Communication Interface 181 and Communication Antenna 122 The communication interface 181 processes the phase voltage and the specific time output from the signal processing circuit 121 into a form that can be wirelessly transmitted by the communication line 3. It transmits to master station 2 via

(Viii) Oscillator 151 A reference time signal for measuring the reference time is supplied to the reference clock 15.
Output to 2. (Ix) Reference clock 152 The reference time sequentially corrected by the time synchronization correction circuit 153 is measured, and the measured reference time is used as the phase voltage holding circuit 173.
Output to (X) Time synchronization correction circuit 153 According to the synchronization signal output from GPS receiver 161,
The time of the reference clock 152 is synchronized with the standard time held by the GPS satellite.

(Xi) GPS Antenna 123 and GPS Receiver 161 The GPS antenna 123 receives a radio wave from a GPS satellite and sends it to the GPS receiver 161. And GPS
The receiver 161 extracts standard time information held by the GPS satellite from the received radio wave as a synchronization signal, and outputs the synchronization signal to the time synchronization correction circuit 153. (Xii) The signal processing circuit 121 receives the phase voltage and the specific time output from the phase voltage holding circuit 173, and the transmission permission signal output from the signal level detection circuit 174, and sets the phase only during a period in which the transmission permission signal is output. Communication interface 18 for voltage and specific time
Output to 1.

(2) Master Station 5 As shown in FIG. 11, the master station 5 includes a receiving unit 51, a processing unit 52, a display unit 53, and a storage unit 54.

The receiving means 51 includes a communication antenna 512 and a communication interface 511. The communication interface 511 converts the radio wave of each slave station 1 received by the communication antenna 512 into a phase voltage and a specific time, and sends the phase voltage and the processing time to the processing unit 52.

The processing means 52 includes a central processing unit 52 such as a personal computer or a microcomputer.
1 is provided. Further, the central processing unit 521 includes the receiving unit 5
1, the phase voltage and the specific time of each slave station 1 received are compared for each phase, the phase having the smallest phase difference is determined to be the same phase, and the phase detection result is output to the display means 53 and the storage means 54.

The display means 53 includes a liquid crystal display 531
And a printer 532, and displays the phase detection result obtained by the processing means 52. The storage means 54 is an auxiliary storage device 54 composed of a hard disk, a semiconductor memory, and the like.
1 for storing programs, phase detection results, and the like.

(3) Communication Line 3 As the communication line 3, an existing public wireless network such as a PHS or a mobile phone was used.

2. Phase Detection Method Hereinafter, a phase detection method of the same phase by the transmission and distribution line phase detection system according to the second embodiment will be described. In the master station, each slave station 1a, 1
b, the phase voltages E _aA , E _aB , E _aC , E _bA , E _bB , and E _bC (see FIG. 12) of each phase A, B, and C (see FIG. 6) The same phase is detected by comparing the phase voltages of the slave stations. First, a phase comparison is performed between the phase voltage E _aA of the A-phase of the slave station 1a at a specific time T _x and the phase voltages E _bA , E _bB , and E _bC of the _respective phases of the slave station 1b at the same time T _x . The phase having the smallest phase difference and within which the phase difference falls within an allowable range is defined as the same phase.

In the B and C phases of the slave station 1a,
Similarly to the phase A, the phase voltages E _bA and E b of the respective phases of the slave station 1b at the same time.
_The same phase is determined by comparing the phases with _bB and _EbC . Further, when any of the phases cannot determine the same phase, or when the determined same phase overlaps (for example,
If it is determined that the A and B phases of the slave station 1a are the same as the C phase of the slave station 1b), it is processed as detection failure.

3. Operation method of transmission / distribution line phase detection system
Perform the following operations. First, as shown in FIGS. 9 and 2,
The arbitrary two-way switch 41 provided on the transmission and distribution line 4 and the main station 1 are connected in parallel and fixed to a utility pole or the like. In addition, the master station 5 arranged in a work vehicle or the like is operated to receive radio waves transmitted from the slave station 1.

Each of the connected slave stations 1 has a GPS receiving means 1
6, the reference clock 152 based on the GPS time received by
Of the phase voltage detecting means 17
Is transmitted to the master station 5. The master station 5 receives the phase voltage and the specific time sent from each slave station 1 by the receiving means 51, and The same phase is detected by using the method shown in the phase detection method, and the phase detection result is displayed by the display means 53.

3. Effect of Transmission and Distribution Line Phase Detection System Such a transmission and distribution line phase detection system can detect the same phase between two points on the transmission and distribution line as in the first embodiment. Therefore, by using the present transmission and distribution line phase detection system, it is possible to easily perform a load connection that can share the load of each phase. Further, similarly to the first embodiment, accurate phase detection can be performed by GPS. Furthermore, since the slave station is integrated with the construction switch, the connection is easy, and there is no need to make a new connection for phase detection.

The present invention is not limited to those shown in the above embodiments, but may be variously modified within the scope of the present invention depending on the purpose and application. That is, in each of the embodiments, the slave station is connected in parallel with the segmented switch. However, the present invention is not limited to this. In addition, although the master station is provided in the work vehicle, the present invention is not limited to this, and the master station can be configured and can be installed indoors such as a branch or a business office to operate the system. . Further, the slave station and the master station can be used integrally.

The slave station 1 in each embodiment is not limited to the configuration shown in the embodiment, and can be arbitrarily changed. For example, although the slave station 1 is integrated with the construction switch 11,
As shown in FIG. 13, it can be used in a form that does not include the switch body 111. Furthermore, it can be integrated with any equipment of the transmission and distribution line 4 (for example, the section switch 41 or the like). Further, VD is used as a means for detecting a phase voltage, but any device used for voltage measurement such as VT can be used.

The master station 2 is not limited to the configuration shown in the embodiment, but can be arbitrarily changed. The display means 23 is not limited to the liquid crystal display 231 and the printer 232, and may be a display using a liquid crystal, a light emitting diode, a CRT, or the like. Further, transmission can be performed by a method such as voice.

The communication line 3 can be connected by a wire such as a metal cable or an optical cable. In addition, wireless connection using radio waves (e.g., radio waves with specific low power) or light can be performed. Further, a dedicated line such as a VAN or a transmission and distribution line can be used.

Further, since the slave station 1 of each embodiment is provided with the construction switch 11, the zero crossing time detecting means 1 is provided.
Although three systems are provided, only one system can be provided. For example, in indirect construction by hot stick method or the like, a slave station having only one system of zero-crossing time detecting means is sequentially used for each line (each phase) of the transmission and distribution line, so that the zero point of each line can be reduced. By detecting the cross time, the same phase can be detected.

[0058]

The transmission and distribution line phase detection system according to the first aspect of the present invention can detect the same phase between any two points on the transmission and distribution line by detecting the zero crossing time. Further, the transmission and distribution line phase detection system of the second invention can detect the same phase between any two points on the transmission and distribution line by detecting the phase difference of the phase voltage at a specific time. This allows the absolute phase of the transmission and distribution lines to be known, so that the loads can be connected to each phase in a well-balanced manner and the load on each layer can be balanced. Can be done

As described in the third aspect, since the reference time corrected by the GPS is used as a basis, accurate phase detection can be performed. Furthermore, as shown in the fourth invention, connection is easy, and there is no need to make a new connection to the transmission and distribution line in order to perform phase detection.

[Brief description of the drawings]

FIG. 1 is a schematic diagram for explaining a connection configuration of a transmission and distribution line phase detection system according to a first embodiment.

FIG. 2 is a schematic diagram for explaining a connection configuration between a transmission and distribution line and a slave station.

FIG. 3 is a circuit diagram for explaining a configuration of a construction switch.

FIG. 4 is a block diagram for explaining a configuration of a slave station body according to the first embodiment.

FIG. 5 is a block diagram illustrating a configuration of a master station according to the first embodiment.

FIG. 6 is a schematic diagram for explaining a phase detection method.

FIG. 7 is a schematic diagram for explaining a phase detection method according to the first embodiment.

FIG. 8 is a schematic diagram for explaining a phase detection method according to the first embodiment.

FIG. 9 is a schematic diagram for explaining a connection configuration of the transmission and distribution line phase detection system according to the first embodiment.

FIG. 10 is a block diagram illustrating a configuration of a slave station body according to the second embodiment.

FIG. 11 is a block diagram illustrating a configuration of a master station according to the second embodiment.

FIG. 12 is a schematic diagram for explaining a phase detection method according to the second embodiment.

FIG. 13 is a circuit diagram illustrating a configuration of a VD for independent connection.

[Explanation of symbols]

1, 1a, 1b; slave station, 11; construction switch, 111;
Switch body 112; VD, 12; slave station body 122
212; communication antenna, 123; GPS antenna, 2,
5; master station; 3; communication line; 4; transmission and distribution line; 41;

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hirofumi Tayama 3-3-22 Nakanoshima, Kita-ku, Osaka City Inside Kansai Electric Power Co., Inc. (72) Inventor Yasunori Kinmori 3-2-2 Nakanoshima, Kita-ku, Osaka City No. Kansai Electric Power Co., Inc. (72) Junji Taniguchi 3-3-22 Nakanoshima, Kita-ku, Osaka-shi Kansai Electric Power Co., Ltd. (72) Inventor Takaoka Honshu 1-5-5, Hamanakacho, Minami-ku, Nagoya Inside Piezoelectric Co., Ltd. (72) Inventor Masanori Sugiura 35 Fukamama, Nagagusa-cho, Obu City, Aichi Prefecture F-term in Technical Research Institute, Japan High Voltage Electric Co., Ltd. 2G030 AA00 AA04 AG00

Claims (4)

[Claims] 1. A transmission / distribution line phase detection system comprising: two slave stations each having a zero-crossing time detecting means, a timing means and a zero-crossing time transmitting means; and a master station having a receiving means, a processing means and a display means. Each of the slave stations is connected to any two points of the transmission and distribution line, the time counting means measures a reference time, and the zero-crossing time detecting means determines that the phase voltage of each phase at each point is zero. From the reference time, the zero-cross time transmitting means transmits the zero-cross time to the master station, and the master station is connected to each of the slave stations by a communication line, and the receiving means Upon receiving the zero cross time, the processing means detects the same phase between the slave stations from the zero cross time, the display means displays the same phase, Zero crossing time of each phase of slave station and other A transmission / distribution line phase detection system, wherein a phase having the smallest time difference is determined to be the same phase by comparing the zero-cross times of the phases of the slave stations with each other. 2. A transmission / distribution line phase detection system comprising: two slave stations each including a phase voltage detection unit, a time measurement unit, and a phase voltage transmission unit; and a master station including a reception unit, a processing unit, and a display unit. Each of the slave stations is connected to any two points on a transmission and distribution line, the time-measuring means measures a reference time, and the phase voltage detecting means measures the respective points at a specific time obtained by the time-measuring means. The phase voltage transmitting means transmits the specific time and the phase voltage to the master station, the master station is connected to each of the slave stations by a communication line, and the receiving means operates at the specific time and Receiving the phase voltage, the processing means detects the same phase between the slave stations based on the specific time and the phase voltage, the display means displays the same phase, and the detection of the same phase is the same. At the specified time, one of the children A transmission and distribution line phase detection system, wherein a phase voltage of each phase of a station is compared with a phase voltage of each phase of the other slave station, and a phase having the smallest phase difference is made the same phase. 3. Each of the slave stations receives a GPS radio wave,
The transmission / distribution line phase detection system according to claim 1 or 2, further comprising a GPS receiving means for specifying a current time held by the GPS, and capable of synchronizing the current time held by the GPS with the reference time. 4. The transmission / distribution line phase detection system according to claim 1, wherein each of the slave stations is formed integrally with a construction switch.