JP4174312B2 - Impedance unit for hot-wire construction used for power line for distribution line carrier communication and its mounting method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the power line carrier communication using the power line as a communication line, the power line carrier communication power line capable of reducing the leakage electric field strength of a signal generated because the power line is unbalanced in high frequency, and the power line carrier communication The present invention relates to a live line impedance unit used for a power line.
[0002]
[Prior art]
Regardless of whether the power line (distribution line) is a two-wire type, a three-wire type, or the like, one of the wires is often grounded by a ground wire, and this grounded wire is called a neutral wire. Other wires that are not grounded are called ungrounded wires to distinguish them. There is so-called power line carrier communication that performs communication by superimposing a high-frequency signal on such a power line. In conventional power line carrier communication, a plurality of power line carrier communication devices (generally transceivers) connect one end of a coupling circuit (having two terminals) of each to a neutral line and the other end to an ungrounded line. Communicate with each other by exchanging data with a carrier wave (high frequency) via a power line.
[0003]
[Problems to be solved by the invention]
However, since the neutral line is grounded by the ground line and the non-ground line is not grounded, the neutral line and the non-ground line are in an unbalanced state as a high-frequency signal line. For this reason, the high-frequency signal transmitted from the power line carrier communication device leaks to the outside of the power line, the strength of the leakage electric field increases, and interference with other communication propagating through other adjacent power lines or communication lines, etc. There was an influence.
[0004]
[Means for Solving the Problems]
Hot work impedance units in use in the power distribution line communication power line according to the present invention, the impedance element having a predetermined impedance at the power line carrier communication frequency, respectively provided on both electrodes of the impedance element, the neutral line of the distribution line and clamping of the conductive sandwiching the ground wire from the top of the coating to ground, first and a needle for electrically connecting the clamp and the ground line through the covering of the ground line provided on the clamp And a second caulking portion.
[0005]
In addition, the method for attaching the impedance unit for hot wire construction according to the present invention connects the first and second caulking portions of the impedance unit for hot wire construction used for the power line for communication of the distribution line carrier at predetermined intervals in the middle of the ground wire. Then, the ground wire is cut between the first and second caulking portions.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
1 is a block diagram showing a configuration of a power transmission line power transmission line according to Embodiment 1 of the present invention. In FIG. 1, power line carrier communication devices 7a and 7b are connected between a neutral line 2 constituting a three-wire power line and an ungrounded line 1b via a coupling circuit 6a6b. The neutral wire 2 is grounded by the ground wire 3. An impedance element 4 is replaced in the middle of the ground wire 3. The power sources 5a and 5b supply power between the neutral line 2 and the non-ground lines 1a and 1b.
[0007]
Next, the operation of the power distribution communication power line of the first embodiment will be described with reference to FIG. The power line carrier communication device 7a transmits (or receives) a high frequency signal between the non-ground line 1b and the neutral line 2 by the coupling circuit 6a. The power line carrier communication device 7b is connected between the non-ground line 1b and the neutral line 2 by the coupling circuit 6b. The power line communication devices 7a and 7b can communicate by transmitting and receiving a high frequency carrier wave using the non-ground line 1b and the neutral line 2 as signal lines. A frequency band of 1.7 MHz to 30 MHz is used for power line carrier communication. The neutral wire 2 is grounded by the ground wire 3. An impedance element 4 having a substantially flat inductance in the frequency band is attached (replaced) to the ground line 3.
[0008]
Next, the structure and characteristics of the impedance element 4 will be described. As shown in FIG. 2, the impedance element 4 includes two (two) partial cores 14 a and 14 b obtained by cutting a cylindrical ferrite core 14 (which is a cylinder but may be a polygonal cylinder) by a plane parallel to the axis of the cylinder. As shown in FIG. 3, a plurality of portions are replaced with the ground wire 3. Moreover, the ferrite core 14 can obtain a predetermined impedance within this frequency band by using the ferrite core 14 that does not deteriorate the magnetic characteristics even at the upper limit of the carrier frequency band of power line carrier communication.
Next, a state where the ferrite core 14 is attached to the ground wire 3 will be described. FIG. 3 is a view showing a state in which the ferrite core 14 is attached to the ground wire 3, and FIG. The partial cores 14 a and 14 b are attached so as to sandwich the ground wire 3, and then fixed to the ground wire 3 by the adhesive tape 17.
[0009]
Since the impedance of the ground wire 3 is increased in the carrier frequency band by replacing the ferrite core 14, the neutral wire 2 is equivalently ungrounded in the same band, and the balance between the non-ground wire 1b and the neutral wire 2 is increased. Improved in the same band. Since the balance between the non-ground line 1b and the neutral line 2 is improved in the same band, the common mode current when the carrier signal of the power line carrier communication is injected between the non-ground line 1b and the neutral line 2 is increased. The intensity of the leakage electric field generated by the common mode current can be reduced. Note that the effect of improving the balance between the non-grounded wire 1b and the neutral wire 2 can be further enhanced by attaching the impedance element 4 at a position as close as possible to the junction of the neutral wire 2 and the ground wire 3.
Since the power frequency is sufficiently lower than the carrier wave communication frequency, the change in the impedance of the ground wire 3 by the ferrite core 14 has almost no influence on the power frequency.
In the above description, the ferrite core 14 is described as having the partial cores 14a and 14b attached. However, the impedance element 4 may be configured by penetrating the ground wire 3 through the cylindrical ferrite core. In the figure, only one ferrite core 14 is shown, but a plurality of ferrite cores 14 may be attached. Further, the ground wire 3 may be passed through one ferrite core 14 a plurality of times.
[0010]
Embodiment 2. FIG.
FIG. 5 is a configuration diagram showing a configuration of a power transmission line power communication line according to the second embodiment of the present invention. In addition, in each following figure, since the same code | symbol shows the same or an equivalent part, the detailed description is abbreviate | omitted. 5, the ferrite core winding unit 24 shown in FIG. 6 is used as the impedance element 4 shown in FIG.
[0011]
FIG. 7 is a block diagram showing a functional configuration inside the ferrite core winding unit 24 shown in FIG. The ferrite core winding unit 24 includes a connection portion 29 a for connection to the ground wire 3, a connection portion 29 b for connection to the ground side E, a ring-shaped ferrite core 30, and a winding wound around the ferrite core 30. The line part 31 is included. The winding part 31 is connected to the connection part 29a and the connection part 29b. The winding portion 31 is wound around the ferrite core 30 by two or more turns (the number of wires passing through the ferrite core ring is two or more).
[0012]
The ground wire 3 shown in FIG. 1 of the first embodiment only penetrates the hollow portion of the ferrite core 14 once, whereas in the second embodiment, the winding portion 31 is wound around the ferrite core 30 by two turns or more. Since the inductance increases with the square of the number of turns, the increase in impedance of the impedance element in the power line carrier communication band is larger than that in the impedance element 4 shown in the first embodiment. The ground wire is more reliably ungrounded at 1 and the balance between the non-ground wire 1b and the neutral wire 2 is improved in the same band. Since the balance between the non-ground line 1b and the neutral line 2 is improved in the same band, the common mode current when the carrier signal of the power line carrier communication is injected between the non-ground line 1b and the neutral line 2 is reduced. In addition, the strength of the leakage electric field generated by the common mode current can be reduced.
Similarly to the mounting position of the impedance element 4 described in the first embodiment, the ferrite core winding unit 24 is mounted at a position as close as possible to the junction of the neutral wire 2 and the ground wire 3 so that the non-ground wire 1b. And the effect of improving the balance of the neutral wire 2 can be enhanced. A plurality of ferrite core winding units 24 may be connected in series.
[0013]
Embodiment 3 FIG.
FIG. 7 is a block diagram showing the configuration of a power line for power line carrier communication according to Embodiment 3 of the present invention, in which an impedance upper 35 is used as the impedance element 4 of FIG.
[0014]
FIG. 8 is a block diagram showing the configuration of the impedance upper 35 shown in FIG. The impedance upper 35 includes a connection portion 29 a for connecting to the ground wire 3, a connection portion 29 b for connecting to the ground side E, and a coil 41. The coil 41 is connected to the connection part 29a and the connection part 29b.
[0015]
The coil 41 increases the impedance in the frequency band of power line carrier communication, improves the balance between the ungrounded wire 1b and the neutral wire 2, and reduces the strength of the leakage electric field. Here, the coil 41 may be an air-core coil or a coil in which a ferrite core is wound around a bobbin provided on a winding core.
[0016]
Embodiment 4 FIG.
Since power line carrier communication is a technology that has recently emerged with many power lines already installed, power line carrier communication power lines can be transported using existing power lines rather than newly constructed power lines. Often done. Therefore, it is preferable that the impedance element 4 shown in FIG. 1 can be attached by hot wire work.
When attaching the ferrite core 14 of FIG. 2 of Embodiment 1, it is not necessary to cut | disconnect the ground wire 3, Therefore It can work with a live line. However, in the case of the second and third embodiments, the ground wire 3 must be cut and the impedance element 4 must be connected. Therefore, in order to ensure the ground state of the neutral wire 2 being cut, for example, work It is inefficient because a temporary ground wire is required.
The impedance unit 9 for hot-wire construction in FIG. 9 can be attached by hot-line work by using it instead of the impedance element 4 of the distribution line carrier communication power line according to the second to third embodiments of the present invention. It is what I did.
[0017]
FIG. 10 is a configuration diagram showing a functional configuration of the hot wire construction ferrite winding unit 45 of the present embodiment embodying the hot wire construction impedance unit 9 of FIG. 9.
FIG. 11 is a structural diagram showing a detailed structure of the caulking portion inside the ferrite core winding unit 45 for hot wire construction shown in FIG. The ferrite core winding unit 45 for hot wire construction includes a first caulking portion 50a for connecting to the ground wire 3, a second caulking portion 50b for connecting to the ground side E, the ferrite core 30, and the winding portion 31. ing. The winding part 31 is connected to the first caulking part 50a and the second caulking part 50b. The winding portion 31 is wound around the ferrite core 30 by two or more turns (the number of through wires in the ring is two or more).
[0018]
As shown in FIG. 12, the first and second caulking portions in FIG. 10 are composed of clamps 53a, 53b, bolts 54a, 54b, 54c, 54d, nuts 55a, 55b, 55c, 55d, a needle 56, and a connecting portion 57. ing.
[0019]
Next, a method of attaching the ferrite core winding unit 45 for hot wire construction shown in FIG. 10 to the ground wire 3 by hot wire construction will be described with reference to FIG. In FIG. 12A, the ground wire 3 is covered with a coating 3X. The ground wire 3 (either from the top of the covering 3X or after the covering 3X is peeled off) of the terminals (first and second caulking portions 50a, 50b) of the ferrite core winding unit 45 for hot wire construction Clamped by the clamps 53a and 53b and tightened by bolts 54a, 54b, 54c and 54d, nuts 55a, 55b, 55c and 55d, as shown in FIG. At this time, the needle 56 penetrates the coating 3X and the ground wire 3 and the clamp are electrically connected. Next, as shown in FIG. 12C, the ground wire 3 is cut between the first and second clamps 50a and 50b. Thereby, it becomes possible to attach the ferrite core winding unit 45 for hot wire construction without opening the grounding state.
[0020]
Moreover, after attaching the ferrite core winding unit 45 for hot wire construction to the grounding wire 3, the grounding wire 3 is cut, so that the impedance in the band of the power line carrier communication increases, and the non-grounding wire 1b and the neutral wire 2 and the strength of the leakage electric field can be reduced.
Although not shown in the figure, when removing the ferrite core winding unit 45 for hot wire construction, first, the ground wires 3 that have been cut are connected to each other, and then the first and second clamps are opened. , Can be removed while keeping the ground.
[0021]
Embodiment 5 FIG.
FIG. 13 is a functional configuration diagram of the hot wire construction impedance upper 61 according to the fifth embodiment, which embodies the hot wire construction impedance unit 9 of FIG. 9 according to the fourth embodiment, and FIG. 14 is a structural diagram thereof.
The impedance upper 61 for hot-wire construction has a caulking portion 50a for connecting to the ground wire 3, a caulking portion 50b for connecting to the ground side E, a coil 41, and a movable ferrite core 60 that can adjust the inductance of the coil 41. ing. The movable ferrite core 60 has a structure in which the inductance of the coil 41 can be adjusted by putting it in and out of the coil 41.
Further, the structure of the caulking portion is the same as FIG. 11 shown in the fourth embodiment of the invention.
[0022]
Moreover, the method of attaching the impedance upper 61 for hot wire construction to the grounding wire 3 is the same as the method shown in FIG. 12 of Embodiment 4 of the invention.
[0023]
By installing the live line construction impedance upper 61 to the ground line 3, the impedance of the ground line 3 in the power line carrier communication band is increased, the balance between the non-ground line 1b and the neutral line 2 is improved, and the leakage electric field is increased. The strength of can be reduced. In addition, since the impedance of the ground line 3 can be adjusted to some extent by the movable ferrite core 60, by adjusting according to the frequency of the power line carrier used or according to the balance between the non-ground line 1b and the neutral line 2, The degree of balance can be increased.
[0024]
【The invention's effect】
Since the power line for power line carrier communication according to the present invention is configured as described above, the impedance in the power line carrier communication band of the ground line can be increased. The balance at the carrier frequency is improved and the strength of the leakage electric field can be reduced. In addition, this makes it possible to obtain the operational effect that the hot wire construction ferrite core winding unit 45 can be attached without opening the grounding state.
[0025]
According to the impedance unit for hot wire construction according to the present invention, the clamp of the live wire construction impedance unit is attached to the ground wire in the live wire state, and then the ground wire is cut to damage the live wire state of the ground wire. In addition, there is an effect that the impedance unit for hot wire construction can be inserted in series in the middle of the grounding wire.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a configuration diagram of a power distribution communication power line according to a first embodiment of the present invention.
2 is a structural diagram showing the structure of the ferrite core of FIG. 1;
FIG. 3 is an explanatory diagram for explaining a mounting state of the ferrite core of FIG. 1;
4 is a cross-sectional view of the ferrite core of FIG.
FIG. 5 is a configuration diagram of a power distribution communication power line according to a second embodiment of the present invention.
6 is a structural diagram showing the structure of the ferrite core winding unit of FIG. 5;
FIG. 7 is a configuration diagram of a power distribution communication power line according to a third embodiment of the present invention.
8 is a structural diagram showing the structure of the impedance upper in FIG. 7;
FIG. 9 is a connection explanatory diagram of an impedance unit for hot-wire work showing Embodiment 4 of the present invention.
10 is a structural diagram showing a structure of the impedance unit for hot-wire work in FIG. 9. FIG.
FIG. 11 is a partial detailed structural diagram of FIG. 10;
FIG. 12 is a configuration diagram of an impedance unit for hot wire construction according to Embodiment 5 of the present invention.
13 is a structural diagram of the impedance unit for hot-wire work shown in FIG.
[Explanation of symbols]
1a, 1b ungrounded wire, 2 neutral wire, 3 ground wire,
4 impedance element, 5a, 5b power supply,
6a, 6b coupling circuit, 7a, 7b power line carrier communication device,
14 ferrite core, 14a, 14b partial core,
17 Adhesive tape, 24 Ferrite core winding unit,
29a, 29b connections, 30 ferrite cores, 31 windings,
35 impedance upper, 41 coils,
45 Ferrite core winding unit for hot wire construction,
50a first caulking part, 50b second caulking part,
53a, 53b clamp, 56 needles, 60 movable ferrite core,
61 Impedance upper for live line construction.

Claims (5)

Impedance element having a predetermined impedance at the power line carrier communication frequency, said respective provided both poles of the impedance element, a ground line for grounding the neutral line of the distribution line and clamping of the conductive sandwiching from above the cover, the clamp 1. A power line for communication of a distribution line, comprising: first and second caulking portions that are provided and have needles that pass through the coating of the ground wire and electrically connect the ground wire and the clamp. hot-line for construction impedance units in use to. Said impedance element is active wire construction used in the distribution line carrier communication power line according to claim 1, wherein the ground line is obtained with a ring-shaped ferrite core which penetrates more than once inside Impedance unit.   The said impedance element is a coil, The impedance unit for hot wire construction used for the power line for distribution line conveyance communication of Claim 1 characterized by the above-mentioned. Rukatsusen construction impedance unit using distribution line carrier communication power line according to claim 3, characterized in that a movable ferrite core mounted for out within the coil. After connecting the first and second caulking portions of the impedance unit for hot-wire construction used for the power line for distribution line carrier communication according to claim 1 at a predetermined interval in the middle of the ground wire, the first and second A method for mounting an impedance unit for hot wire construction used for a power line for distribution line carrier communication, characterized in that the ground wire is cut between second caulking portions.

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