JP2007330026A - Apparatus for determining whether or not control equipment can be installed in distribution line network - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To determine, when a carrier wave for a control signal is sent from a distributing substation to control equipment provided in a distribution line network via a distribution line, beforehand whether or not the carrier wave can be received and thus efficiently install the control equipment. <P>SOLUTION: Control equipment is installed in a distribution line network so formed that it is arborescently extended from a distributing substation. An apparatus is used to determine beforehand whether or not a carrier wave for a control signal sent via a distribution line can be received at a point where the control equipment is to be installed. The apparatus includes: a means 20 for detecting a voltage wave passed through the distribution line; a means 22 for extracting a signal wave corresponding to the carrier wave superimposed on the voltage wave detected by the detecting means from this voltage wave; and a means for determining whether or not carrier waves can be received at a planned point of installation based on the level of the signal wave extracted by the extracting means. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  In the present invention, a control signal carrier transmitted via a distribution line is received at a location where the control apparatus is to be installed, with respect to a control apparatus provided in a distribution network formed in a dendritic shape from a distribution substation. The present invention relates to a determination device for determining in advance whether or not it is possible.

Usually, a distribution line is laid for the purpose of supplying electric power. However, from the viewpoint of effective use of existing equipment, there is a technique for placing a signal other than the supplied power on the distribution line (see, for example, Patent Document 1). In this technology, in order to perform phase discrimination at both ends of an arbitrary section of a high-voltage distribution line, a timing signal designating a zero-cross point is injected into the distribution line, and it has been transmitted through the distribution line at the part where phase discrimination is performed. A signal is detected, and phase discrimination is performed based on the timing of the zero cross point of the detected signal.
JP 2001-133497 A

  In general, distribution lines for power supply extend in a dendritic manner from distribution substations, and each distribution line is divided by a switch, and other distribution lines are connected to each section. A multi-system distribution line network is formed. In this way, the distribution network is divided into parts when a power transmission accident such as a ground fault of a distribution line or a short-circuit occurs. This is to make it easier to find out.

  Here, in order to enjoy the benefits of the distribution network classification as described above, it is necessary to control a control device such as a switch provided in the distribution network from a distance. However, these control devices are not necessarily located at a short distance from the source of the control signal. Therefore, when sending a control signal to a control device, it is effective to always use a distribution line existing in the vicinity thereof. However, since this distribution line is essentially for supplying electric power, unlike the communication line, measures such as reflection and attenuation of the control signal are not sufficiently taken. Therefore, it is not always possible to receive the carrier level of the control signal injected from the distribution substation at a level where the control device can be operated in a place where the control device is planned to be installed.

  If it is found that the carrier wave of the control signal to the control device cannot be received after the control device is installed, it is necessary to move the control device further, resulting in an increase in economic and time costs.

  The present invention has been made in view of the above problems, and when the control signal carrier wave is sent from the distribution substation via the distribution line to the control apparatus provided in the distribution network, the control apparatus is installed. An object is to determine in advance whether or not a carrier wave of the control signal can be received at a planned location and to efficiently install a control device.

  In order to solve the above-described problems, the present invention detects a carrier wave of a control signal from a distribution substation, and whether or not the carrier wave can be received based on the level of a signal wave corresponding to the detected carrier wave. Determine whether. In this way, it is possible to easily determine whether or not the control signal carrier can be received at the planned installation location of the control device.

Specifically, the present invention relates to a control device provided in a distribution line network formed in a dendritic shape from a distribution substation, and a control signal sent from the distribution substation via the distribution line. It is a control device installation availability determination device in a distribution network that determines in advance whether a carrier wave can be received at a planned installation location of the control device, and a detection unit that detects a voltage wave flowing through the distribution line, Extraction means for extracting a signal wave corresponding to the carrier wave superimposed on the voltage wave detected by the detection means, and the installation based on the level of the signal wave extracted by the extraction means Determining means for determining whether or not the carrier wave can be received at a scheduled location.

  In the control device installation availability determination device, the carrier wave of the control signal of the control device transmitted from the distribution substation is first detected as a voltage wave by the detection means. This is because a so-called commercial frequency voltage wave is inherently flowing through the distribution line, and the voltage wave detected by the detection means is in a state where the carrier wave of the control signal is superimposed on this commercial frequency voltage wave. It is a voltage wave. Therefore, it is difficult to accurately determine whether or not the control signal carrier can be received with the voltage wave detected by the detection means.

  Therefore, in the control device installation availability determination device according to the present invention, the extraction unit extracts the signal wave corresponding to the carrier wave. Here, the signal wave is not exactly the same as the carrier wave, but transmits a characteristic point of the carrier wave, particularly a level of the carrier wave. When the signal wave conveys the level information of the carrier wave, the determination means makes the above determination based on the level of the signal wave, so that it is possible to determine in advance whether or not the control device can be controlled from a distance.

  In the control device installation availability determination device in the distribution line network, the detection unit may detect a voltage wave flowing through the distribution line in a non-contact state with respect to a conductor portion of the distribution line.

  Thus, by detecting the voltage wave in a non-contact state with respect to the conductive part of the distribution line, and further extracting the signal wave having a level corresponding to the level of the carrier wave, it is possible to easily install the control device. Can be determined. This is attributed to the efficient installation of control equipment.

  When sending the control signal carrier from the distribution substation via the distribution line to the control equipment provided in the distribution network, determine whether or not the carrier can be received in advance. Installation can be performed.

  Hereinafter, an embodiment of a control device installation availability determination device in a distribution network according to the present invention will be described based on the drawings.

  FIG. 1 shows a schematic configuration of a distribution network 1 for power supply centering on a distribution substation 2. In the distribution network 1, overhead wires 4 are laid out radially via underground cables 3 around the distribution substation 2 (in FIG. 1, three radial distribution lines are shown). Furthermore, the interconnection distribution line is laid so as to connect the radial distribution lines. As a result, in the distribution network 1, the distribution lines are laid in a dendritic shape. Thereby, it becomes possible to supply electric power to a wide area.

In this distribution network 1, in order to prepare for the occurrence of a power transmission accident such as a ground fault or short circuit of the distribution line, a switch is provided for the purpose of identifying the location where the power transmission accident has occurred or narrowing the area affected by the power transmission accident. 5 and 6 are provided. These switches are classified into a section switch 5 and a connection switch 6 depending on the purpose of use and installation location. At normal times when no power transmission accident has occurred, the interconnection switch 6 is in an open state (a state in which no electric power is flowing), and the section switch 5 is in a closed state (a state in which electric power is flowing). On the other hand, when a power transmission accident occurs, the section switch 5 that forms a section including the point is opened and the power supply to other than the section is performed so that the power supply to the point where the accident occurs is stopped. In order to resume, an appropriate interconnection switch 6 is closed.

  In order to control the power transmission section in such a distribution network 1, it is necessary to perform switching control of the switches 5 and 6. The control of this switch will be described with reference to FIG. FIG. 2 shows a state in which the switch-related control device is mounted on the power pole 14 that supports the distribution line 10. The switching control of the switch 12 is performed by a control signal sent from the distribution substation. The carrier wave of this control signal is sent via the distribution line 10, and first, the carrier wave superimposed on the commercial frequency voltage wave (50 Hz or 60 Hz) flowing through the distribution line 10 is taken out by the high voltage coupler 13. Next, the extracted carrier wave is sent to the remote controller 11, and the remote controller 11 performs opening / closing control of the switch 12 based on the control signal in the carrier wave. By doing in this way, it becomes possible to collectively control the switches relaying the distribution substation using the distribution line 10, and thus to control power transmission in the distribution line network when a power transmission accident occurs. Become.

  Here, the important point is that the carrier wave of the control signal from the distribution substation must be receivable at the installation location of the switch and its related control equipment. Since the carrier wave is sent using the distribution line 10, the control signal output from the distribution substation is not necessarily received by the control device 11. In other words, since the distribution line 10 that is not subjected to reflection or attenuation measures is used for communication, there is at least a possibility that it is difficult to receive the control signal. Then, it may be difficult to control the switch that must be performed in the event of a power transmission accident. However, as shown in FIG. 2, much work such as wiring is required to mount the switch and the related control device on the utility pole 14. If it is found that it is difficult to receive a carrier wave once the switch or the like is mounted on the utility pole 14, it is necessary to re-mount the switch or the like again, which is not preferable from a cost standpoint. .

  Therefore, by using the control device installation availability determination device according to the present invention, it is determined in advance whether a carrier wave can be received at a planned installation location such as a switch. As shown in FIG. 2, the control device installation availability determination device includes a sensor unit 20, an operation unit 21, a measurement unit 22, and a signal line 23 that connects the sensor unit 20 and the measurement unit 22. As shown in FIG. 3A, the sensor unit 20 is attached to the distribution line 10 so that the user can hold the operation unit 21 in a non-contact state with respect to the conductive part of the distribution line 10. It is done. In FIG. 3 (a), the sensor unit 20 is installed so as to be hooked to the distribution line 10. Instead, as shown in FIG. 3 (b), a clamp 24 is provided on the open end side of the sensor unit 20. When the sensor unit 20 is hooked on the distribution line 10, the clamp 24 may lightly clamp the distribution line 10. By doing in this way, sensor part 20 can be fixed to distribution line 10 more certainly.

  The sensor unit 20 is a sensor for taking out a carrier wave flowing through the distribution line 10, and is composed of, for example, a voltage dividing capacitor and a voltage sensor that measures the voltage. Further, in the distribution line 10, the insulating portion protects the periphery of the conductive portion. Therefore, between the two, there is a capacitance of the distribution line and a capacitance of the voltage dividing capacitor, and these capacitances, stray capacitances, and the measurement voltage are transmitted to the conductive portion of the distribution line 10. The carrier wave of the control signal can be detected in a non-contact state with respect to the conductor portion of the distribution line.

  However, since the commercial frequency voltage wave is also transmitted to the conductive portion of the distribution line 10, the sensor unit 20 detects the voltage wave in which the commercial frequency voltage wave and the carrier wave of the control signal are superimposed. Therefore, as shown in FIG. 4, the voltage wave detected by the sensor unit 20 is sent to the measurement unit 22 via a signal line in the operation unit 21. The measurement unit 22 is separate from the high pass filter (HPF) unit 22a, the low pass filter (LPF) unit 22b, the amplification (AMP) unit 22c, the peak hold (PH) unit 22d, and the measurement unit 22, but as a display unit. It consists of a functioning personal computer 22e.

  In this embodiment, the carrier wave of the control signal from the distribution substation is a signal in the frequency band of 5 kHz to 10 kHz. On the other hand, since the frequency of the commercial frequency voltage wave is 50 Hz, the cutoff frequency of the HPF unit 22a is set to 3 kHz, and the cutoff frequency of the LPF unit 22b is set to 12 kHz. Then, by performing amplification by the AMP unit 22c, a signal wave having a level having a certain relationship with the level information of the carrier wave is generated. The peak value of this signal wave is held by the PH unit 22d, and the result is displayed on the personal computer 22e.

  FIG. 5 shows the relative relationship between the peak value (detection level) of the signal wave detected by the above method and the carrier level of the control signal from the distribution substation. As shown in FIG. 5, as the carrier wave level decreases, the peak value of the signal wave also decreases, and almost linearity can be found between the carrier wave level and the peak value of the signal wave. Thus, it can be said that the presence of linearity between the two accurately reflects the level of the carrier wave included in the peak value of the actually detected signal wave.

  Therefore, based on the peak value of the signal wave, it is possible to determine whether or not the control signal can be received at a location where the switch or the like is scheduled to be installed. Specifically, a peak value (determination reference value) of a signal wave corresponding to a carrier level of a control signal that can be controlled by a switch or the like is determined in advance through experiments or the like, and whether or not a control device according to the present invention can be installed is determined. If the peak value of the signal wave detected by the device is higher than the predetermined peak value (determination reference value), it is determined that the switch or the like can be installed. In this embodiment, it is assumed that the determination of whether or not reception is possible is automatically performed by a program on the personal computer 22e.

  In the above-described embodiment, the signal processing by the HPF unit 22a, the LPF unit 22b, and the AMP unit 22c in the measurement unit 22 shown in FIG. 4 is performed once, but the peak value of the signal wave and the level of the carrier wave As long as they maintain a substantially linear relationship, the processing by the HPF unit 22a, the LPF unit 22b, and the AMP unit 22c may be repeated a plurality of times to eliminate the influence of the commercial frequency voltage wave as much as possible.

  In the above-described embodiment, the peak value of the signal wave is displayed on the personal computer 22e. However, the display unit may be built in the measurement unit 22. In this case, it is preferable that the display unit can display the determination reference value together with a pointer indicating the magnitude of the peak value of the signal wave, for example.

It is a figure which shows schematic structure of the distribution network constructed | assembled focusing on the substation for distribution. It is a figure showing the usage condition of the control equipment installation availability determination apparatus which concerns on a present Example while showing the mode of the switch mounted on a utility pole, and the control equipment relevant to it. It is a figure which shows the form of the attachment to the distribution line of the sensor part which comprises the control apparatus installation availability determination apparatus which concerns on a present Example. It is a figure which shows the flow of the voltage wave detected by the sensor part in the control apparatus installation availability determination apparatus which concerns on a present Example. It is a figure showing the relative relationship between the level of the signal wave detected in the control apparatus installation availability determination apparatus which concerns on a present Example, and the level of the carrier wave which flows through a distribution line.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Distribution network 2 Distribution substation 10 Distribution line 11 Remote controller 12 Switch 13 High voltage coupler 14 Electric pole 20 Sensor part 21 Operation part 22 Measurement part 22a High pass filter part 22b Low pass filter part 22c Amplification part 22d Peak hold part 23 Signal line

Claims (2)

A control signal carrier sent via a distribution line can be received at a location where the control apparatus is to be installed, for a control apparatus provided in a distribution network formed in a dendritic shape from a distribution substation. It is a control device installation availability determination device in a distribution network that determines in advance whether or not there is,
Detection means for detecting a voltage wave flowing through the distribution line;
Extraction means for extracting a signal wave corresponding to the carrier wave superimposed on the voltage wave detected by the detection means;
Based on the level of the signal wave extracted by the extraction means, determination means for determining whether or not the carrier wave can be received at the installation planned location;
The control apparatus installation availability determination apparatus in a distribution network characterized by comprising.   The apparatus for determining whether or not to install a control device in a distribution network according to claim 1, wherein the detection means detects a voltage wave flowing through the distribution line in a non-contact state with respect to a conductive portion of the distribution line. .

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