JPH10271651A - Method of locating faulty point of compressed gas insulated transmission line - Google Patents

Abstract

PROBLEM TO BE SOLVED: To locate the faulty point of a compressed gas insulated transmission line, by sending the measurement data on from a faulty point locating sensor to a faulty judgment controller, and performing the judgment in every gas block with a fault judgment controller. SOLUTION: A temperature and pressure sensor 10 measures the temperature and pressure of a gas block, and a current sensor 11 measures the current of an earth line 7 connected to a metallic container 1. A data converter 12 receives measurement data from the sensors 10 and 11, converts them into signal form, sends out the signals periodically to an optical fiber 13 and a telephone circuit in the city, and the signal from the data converter 12 to a fault judgment controller 17. By this way, since the temperature and pressure sensor 10 and the current sensor 11 measure and detect the change of temperature and pressure and the change of the current of the grounding line separately for each gas block, so the fault judgment controller 17 can judge the fault separately for each gas block, and the faulty point can be located with high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for locating a fault on an underground transmission line, and more particularly, to a method for locating a fault on an underground transmission line of a gas insulated pipe capable of transmitting a large amount of power.

[0002]

2. Description of the Related Art Generally, a crosslinked polyethylene cable (CV) or the like is used as an underground transmission line, but such an underground transmission line has lower heat dissipation performance and transmission capacity than an overhead transmission line. small. Therefore, in order to transmit power of the same capacity as the overhead transmission line by the underground transmission line, the underground transmission line had to be multiplied. But,
Increasing the number of transmission lines complicates the outgoing substation equipment and increases the cost. Therefore, in recent years, gas-insulated pipelines and underground transmission lines, which have the same transmission capacity as overhead transmission lines even though they are underground transmission lines, have begun to be adopted.

Referring to FIGS. 4 and 5, a conventional gas-insulated pipeline air transmission line will be specifically described. FIG. 4 is a structural view showing a longitudinal structure of the pipeline air transmission line, FIG. 5A is a side sectional view of the pipeline air transmission line, and FIG. 5B is a front sectional view of the same. 4 and 5 show a configuration using a single-phase conductor, but the three-phase configuration has basically the same structure except that a three-phase conductor is arranged.

As shown in FIGS. 4 and 5, a metal container 1 is provided in a gas insulated conduit air transmission line, and the inside thereof is filled with an insulating gas 6 having electric insulation properties. A bellows 2 for absorbing mechanical and thermal deformation is formed in a part of the metal container 1. A main circuit conductor 3 for electric power transmission is housed in the center of the metal container 1.

Further, a cone spacer 4 is provided as a gas dividing spacer at predetermined intervals in the metal container 1, and the space in the metal container 1 is partitioned into a plurality of gas sections by the cone spacer 4. A columnar spacer 5 perpendicular to the axis of the metal container 1 is attached to the conductor 3. The columnar spacer 5 connects the conductor 3 to the metal container 1.
It is for supporting inside. In such a gas insulated conduit air transmission line, the conductor 3 housed in the metal container 1 is insulated by the insulating gas 6, so that a compact structure can be obtained and large-capacity power transmission can be performed. it can.

[0006] In addition, the basic unit length of the above pipeline air transmission line is determined in consideration of transportation conditions and on-site installation workability. The track is assembled. At this time, since the pipeline air transmission line is laid over a long distance, each gas section is generally formed about every 50 m by a gas section spacer for insulating gas management. The volume of one gas section is very large as compared with the volume of a gas-insulated space in a standard gas-insulated switchgear because the space between the gas section spacers is about 50 m.

[0007] By the way, in the event that a failure occurs in the pipeline air transmission line, like the air-insulated transmission line,
It is important to locate the point of failure. In other words, it is necessary to quickly identify a point where an abnormal phenomenon such as a ground fault has occurred, and to promptly recover the point. As a conventional example of locating a fault point, there are known an impedance calculation method and a surge receiving method used for a conventional transmission line. Further, as a method of locating a failure point used in the gas insulated switchgear, there is a method of locating a failure point by capturing a shock wave thereof by utilizing a sudden rise in pressure in a gas space when an arc failure occurs.

[0008]

However, when the above-described fault point locating method is applied to a pipeline air transmission line, there are the following problems. That is, the positioning accuracy of the impedance calculation method and the surge receiving method used for the conventional transmission line is about ± 1 km. On the other hand, the fault location in a pipeline air transmission line requires much more severe location accuracy than the conventional transmission line. This is because the pipeline air transmission line has a hermetic structure, and it is difficult to find a fault location from the outside, so it depends only on the accuracy of fault point location.

Further, as described above, the volume of the gas section in the pipeline air transmission line is set to be much larger than the gas insulated space of the gas insulated switchgear. Therefore, even if the method for locating the failure point of the gas insulated switchgear is adopted for the pipeline air transmission line, even if an arc failure occurs in the pipeline air transmission line, the gas pressure does not greatly increase, and There was a risk that the point could not be found.

[0010] Furthermore, at present, as gas-insulated pipelines and air-borne power transmission lines are becoming widespread due to the increase in power transmission capacity, failures may be predicted in advance by capturing phenomena that may develop into failures in the future. There is a need for a high-performance fault location method. Also, with the spread of pipeline air transmission lines, the pipeline air transmission lines tend to be longer. Therefore, development of a fault point locating method capable of locating a fault point with simple equipment without increasing a large amount of cost for a long-sized pipeline air transmission line is expected.

SUMMARY OF THE INVENTION The present invention has been proposed to solve the above-described problems, and has a pipeline air transmission line capable of locating a failure point of a pipeline air transmission line with high accuracy. The main object of the present invention is to provide a method for locating a failure point.

Another object of the present invention is to provide a pipeline air transmission system that contributes to improving the reliability of a transmission line by predicting a failure and maintaining the pipeline air transmission line with a sufficient margin. It is an object of the present invention to provide a method for locating a fault on a track.

Still another object of the present invention is to provide a highly economical method for locating a fault in a pipeline air transmission line, which is capable of locating a fault with simple equipment.

[0014]

To achieve the above object, according to the first aspect of the present invention, there is provided a pipeline having spacers arranged at predetermined intervals in a metal container and having gas sections partitioned by the spacers. A method for locating a failure point in an air transmission line, comprising: installing a failure point locating sensor in the gas section, measuring at least one of temperature, pressure, and ground line current of the gas section; A failure determination control unit is installed at an electric station of the underground transmission line, and measurement data from the failure point locating sensor is transmitted to the failure determination control unit. Is determined.

According to the first aspect of the present invention, the failure point locating sensor detects a change in at least one of temperature, pressure, and ground line current for each gas section, and converts the measured data into a failure. Transmit to the judgment control unit.
Therefore, the failure determination control unit can determine a failure for each gas section, and can locate a failure point with high accuracy. As a result, a ground fault point occurring in the pipeline airborne transmission line can be determined, and quick failure recovery becomes possible.

According to a second aspect of the present invention, in the method for locating a fault in a pipeline air transmission line according to the first aspect, the fault locating sensor periodically transmits measurement data to the fault determination control unit. The failure determination control unit performs a predictive maintenance process based on measurement data sent periodically.

According to the second aspect of the present invention, since the failure determination control unit performs the predictive maintenance processing based on the periodically transmitted measurement data, there is a possibility that the failure may develop into a failure in the future. Can be detected early, and the pipeline air transmission line can be maintained with a sufficient margin.

According to a third aspect of the present invention, in the method for locating a fault in a pipeline air transmission line according to the first or second aspect, the measurement data from the fault locating sensor to the failure determination control unit is transmitted by an optical fiber cable. It is characterized by transmission.

The invention according to claim 4 is the invention according to claim 1, 2 or 3.
In the method for locating a fault in a pipeline air transmission line described above, the measurement data from the fault locating sensor to the failure determination control unit is transmitted via a city telephone line.

According to the third or fourth aspect of the present invention, an optical fiber cable or a commercial telephone line developed especially in an urban area as a communication network is measured from a fault point locating sensor to a fault determination control unit. Since it is used as data transmission means, it is possible to locate a fault point with relatively simple equipment, and it is possible to suppress the cost required for fault point location.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to the drawings. In the following description, the same members as those of the pipeline air transmission line shown in FIGS. 4 and 5 are denoted by the same reference numerals, and description thereof will be omitted.

(1) This Embodiment As shown in the configuration diagram of FIG. 1, in this embodiment, a temperature / pressure sensor 10 and a current as a failure point locating sensor are provided for each gas section formed in the metal container 1. A sensor 11 is provided, and a data converter 12 corresponding to the sensors 10 and 11 is provided. On the other hand, a failure determination control unit 17 is installed at an electric station of the pipeline air transmission line, and the failure determination control unit 17 and the data conversion unit 12 are connected by the optical fiber 13 and the public telephone line 14. .

Further, referring to FIG.
The detailed configuration of the failure determination control unit 17 will be described. The data converter 12 includes a receiving unit 20, a data processing transmission device 21, and an optical modem 22. Further, the failure determination control unit 17 includes the data processing arithmetic unit 23, the display device 2
4 and a predictive maintenance processing device 25.

In the present embodiment, the temperature / pressure sensor 10 measures the temperature and pressure of the gas section, and the current sensor 11 measures the current of the ground wire 7 connected to the metal container 1. The data converter 12 receives the measurement data from the sensors 10 and 11, and converts the measurement data into an optimal signal form for transmitting the measurement data via the internal receiving unit 20, the data processing transmission device 21, and the optical modem 22 ( Here, a standard communication protocol is adopted in the optical bus type transmission), and the signal is periodically sent to the optical fiber 13 and the public telephone line 14. The optical fiber 13 and the public telephone line 14 transmit a signal from the data converter 12 to the failure determination controller 17.

The failure determination control unit 17 processes the signal sent cyclically from the data conversion unit 12 in the data processing arithmetic unit 23, and determines the presence or absence of a failure for each gas classification of the metal container 1. Then, when an abnormality is determined, the arithmetic processing for specifying the abnormality occurrence part is performed, and at the same time, the abnormality occurrence part is displayed on the display device 24 and an alarm is issued. Further, the predictive maintenance processing device 25 of the failure determination control unit 17 performs trend management of each measurement data and performs predictive maintenance processing.

According to the embodiment, the temperature and the temperature
Since the pressure sensor 10 and the current sensor 11 measure and detect a change in temperature and pressure and a change in ground line current for each gas section, the failure determination control unit 17 can determine a failure for each gas section. Failure points can be located with high accuracy. As a result, a ground fault point occurring in the pipeline airborne transmission line can be accurately specified, and quick failure recovery becomes possible.

Further, since the predictive maintenance processing device 25 of the failure determination control unit 17 performs predictive maintenance processing, a phenomenon which may develop into a failure in the future is discovered at an early stage, and a failure is predicted. Can be prevented. In addition, since the maintenance of the pipeline air transmission line can be performed with a sufficient margin, the reliability of the pipeline air transmission line can be improved.

Further, in the present embodiment, an optical fiber 13 or a public telephone line 14 developed in an urban area as a communication network is used as data transmission means from the sensors 10 and 11 to the failure determination control unit 17. ing. Therefore, the fault point can be located with relatively simple equipment. Therefore, even if the length of the pipeline air transmission line becomes long, the cost for fault location can be kept low, which is extremely economically advantageous.

(2) Other Embodiments The present invention is not limited to the embodiment having an abnormal condition, but includes, for example, an embodiment as shown in FIG. This embodiment is characterized in that data transmission from the data conversion unit 12 to the failure determination control unit 17 is performed using a commercial wireless digital telephone line that has been rapidly developed in recent years.

That is, the data conversion unit 12 and the failure determination control unit 17 include a transmission / reception communication device 27, and transmit a signal based on the measurement data converted by the data conversion unit 12 or a signal processed by the failure determination control unit 17. It is possible to transmit and receive between the two transmitting and receiving communication devices 27 while passing through the base station 26 of the telephone company by wireless communication.

[0031]

As described above, according to the present invention, a fault point locating sensor is installed for each gas section of the pipeline air transmission line, and at least one of the temperature, pressure and ground line current of the gas section is installed. Measurement, and sends the measurement data from the fault point locating sensor to the fault determination control unit installed at the electrical substation in the pipeline air transmission line, so that the failure determination control unit determines failure for each gas classification In addition, it is possible to accurately locate a fault point in a pipeline air transmission line.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a configuration diagram showing an internal configuration of a data conversion unit 12 and a failure determination control unit 17 in the present embodiment.

FIG. 3 is a configuration diagram of another embodiment of the present invention.

FIG. 4 is a structural diagram showing a longitudinal structure of a conventional gas-insulated conduit air transmission line.

FIG. 5A is a side sectional view of a conventional gas pipeline air transmission line, and FIG. 5B is a front sectional view thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Metal container 2 ... Bellows 3 ... Conductor 4 ... Cone spacer 5 ... Column spacer 6 ... Insulating gas 7 ... Grounding wire 10 ... Temperature / pressure sensor 11 ... Current sensor 12 ... Data conversion part 13 ... Optical fiber 14 ... City telephone Line 17: Failure determination control unit 20: Receiving unit 21: Data processing transmission device 22: Optical modem 23: Data processing operation device 24: Display device 25: Predictive maintenance processing device 26: Telephone company base station 27: Transmission / reception communication device

Claims (4)

[Claims] 1. A method for locating a failure point in a pipeline air transmission line having gas sections partitioned by spacers at predetermined intervals in a metal container, the method comprising: Installing a failure point locating sensor in the section and measuring at least one of the temperature, pressure and ground line current of the gas section; installing a failure determination control unit in an electric station of the pipeline air transmission line; A failure point locating method for a pipeline air transmission line, wherein measurement data from a failure point locating sensor is transmitted to the failure determination control unit, and the failure determination control unit determines a failure for each of the gas sections. Method. 2. The failure point locating sensor periodically transmits measurement data to the failure determination control unit, and the failure determination control unit performs predictive maintenance processing based on the periodically transmitted measurement data. The method for locating a fault in a pipeline air transmission line according to claim 1, wherein: 3. The method according to claim 1, wherein the measurement data from the failure point location sensor to the failure determination control unit is transmitted by an optical fiber cable. . 4. The pipeline air transmission line according to claim 1, wherein the measurement data from the failure point locating sensor to the failure determination control unit is transmitted through a public telephone line. Failure point location method.