JP2007228289A - Bridge circuit connector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bridge circuit connector capable of safely and easily connecting a bridge circuit without disconnecting a laid commercial power supply line or stopping power distribution and also eliminating the need of ensuring a new installation place for the bridge circuit. <P>SOLUTION: The bridge circuit 1 is attached to a single phase 3-line type commercial power supply line using an IV cable or the like provided with insulating coating 8, 8' and 8''. The bridge circuit 1 is made of insulating material and respectively holds phase lines 4 and 5 through the insulating coating 8 and 8' by clamp parts 2 and 2'. A capacitor 6 is included as a frequency filter of the bridge circuit 1, and sharp needle-shaped conduction needles 10 and 10' are respectively connected to respective point parts of both terminals of the capacitor 6. The conduction needles 10 and 10' are inserted into the insulating coating 8 and 8' to penetrate the insulating coating 8 and 8', reaching conductors 7 and 7' inside, which electrically conducts the conductors 7 and 7'. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a bridge circuit connector for connecting bridge circuits for connecting different-phase lines of a single-phase three-phase commercial power line in power line carrier communication to realize a different-phase communication connection.

  In the power line carrier communication that has been carried out conventionally, the wiring method by the single-phase three-wire system on the assumption that the household power line is 200 V is the mainstream, so even if it is the same household power wiring by this wiring method, A wiring that is in a different phase occurs in the combination of the phase line and the neutral line.

  If it is a normal communication line, it will not be out of phase because it will be a two-wire multi-connection wiring, but power line carrier communication is a three-wire power line (two phase lines, neutral line 1) In the configuration of the book, the wire is drawn into the home and wired to each outlet or the like by a combination of an arbitrary phase line and a neutral line.

  Therefore, when a network is constructed by transmitting a high-frequency signal on the power line, it is difficult to establish communication because signal attenuation between the different-phase outlets is large.

Therefore, in order to establish communication, a filter connector is used as a circuit that passes high-frequency signals without passing through 50 Hz and 60 Hz, or a method of connecting a capacitor by cutting a cable or attaching a capacitor to a terminal portion of a breaker Is known (see Patent Document 1).
Japanese Patent Laid-Open No. 5-121988

  However, in order to connect a bridge circuit (capacitor, etc.) that connects between different phases to the commercial power line, cut the middle of the power cable of the commercial power line and connect the bridge circuit, or prepare a new power cable. Additional work such as reconnecting the bridge circuit to the power cable of the commercial power line was necessary.

  In addition, for safety reasons, it was necessary to cut the contract breaker or the like so that the commercial power supply current does not flow through the power cable connecting the bridge circuit, and to perform the work in the dead line state where the power supply was stopped. Therefore, the power supply from the commercial power source could not be received during the bridge circuit connection work.

  Further, when the rated current of the commercial power supply line is large, the inductor constituting the bridge circuit to be connected becomes large and the whole size is increased. For this reason, wiring locations are limited in ordinary homes, and it has been difficult to secure a new location for installing such a large bridge circuit other than the existing installation location of the commercial power line.

  The present invention has been made in view of the above problems, and its purpose is to connect a bridge circuit safely and easily without disconnecting a commercial power line laid or stopping energization, and to provide a new bridge circuit. It is also necessary to secure the installation location.

  In order to solve the problem, the present invention according to claim 1 is a bridge circuit for blocking a low-frequency signal flowing in a single-phase three-wire commercial power line and allowing a high-frequency signal used for power line carrier communication to pass through; Connecting means for connecting the two phase lines constituting the single-phase three-wire commercial power supply line through the bridge circuit to make them conductive.

  According to a second aspect of the present invention, in the first aspect, the connection means includes a cable clamp having a circular opening for holding the two phase lines, and an input / output terminal of the bridge circuit. And a needle-like conductive needle that is connected to the phase wire and protrudes from the surface in contact with the phase line, and penetrates the insulating coating of the phase line and conducts to the conductor during the gripping, Is provided.

  According to a third aspect of the present invention, in the second aspect of the present invention, the cable clamp grips the phase line independently, and sets the length of the missing section provided on the circumference of the circular opening. The circumference can be adjusted by shortening or extending by the fastening means.

  According to a fourth aspect of the present invention, in the second aspect of the present invention, the cable clamp grips the two phase lines together, and includes a defect section provided on the circumference of the circular opening. The circumference can be adjusted by shortening or extending the length by the fastening means.

  Further, according to a fifth aspect of the present invention, in any one of the second to fourth aspects, the bridge circuit excluding the conductive needle and the cable clamp are covered with an insulator.

  According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the bridge circuit is configured by any one or a combination of a capacitor and an overvoltage protection element.

  According to a seventh aspect of the present invention, in the sixth aspect, the capacitor has a predetermined withstand voltage characteristic preset with respect to a voltage of the single-phase three-wire commercial power line.

  Further, the present invention according to claim 8 is the method according to any one of claims 2 to 7, wherein foreign matter is prevented from entering a hole formed through the insulating coating around the conductive needle. Foreign matter intrusion prevention means is provided.

  According to a ninth aspect of the present invention, in any one of the first to seventh aspects, at least one of color coding, letters, numbers, symbols, and protrusions that enables the bridge circuit to be identified. With one.

  According to a tenth aspect of the present invention, in any one of the third to ninth aspects, the bridge circuit is configured separately from the cable clamp and is detachable from the cable clamp.

  According to the present invention, the bridge circuit can be safely and easily connected without cutting the installed commercial power supply line or stopping energization, and it is possible to eliminate the need for a new installation location of the bridge circuit.

  FIG. 1 is an explanatory diagram for explaining a connection configuration between a bridge circuit and a single-phase three-wire commercial power supply line according to an embodiment of the bridge circuit connector. In FIG. 1, as the electric wires constituting the single-phase three-wire commercial power supply line, there are two phase lines 4 and 5, one neutral line 9, and between the two phase lines 4 and 5. A connected bridge circuit 1 is shown.

  The bridge circuit 1 electrically connects the phase line 4 and the phase line 5 so that a signal having a frequency used for power line carrier communication can be conducted between the phase lines 4 and 5. This frequency is a high frequency signal, and is different from the frequency of commercial power sources such as 50 Hz and 60 Hz, for example, a frequency in the 1 to 30 MHz band. The bridge circuit 1 prevents a low frequency power supply frequency such as approximately 100 Hz or less, and only a high frequency power line carrier wave communication signal can be conducted.

<First Embodiment>
FIGS. 2 and 3 are configuration diagrams for explaining the configuration according to the first embodiment of the bridge circuit connector. FIG. 2 is a schematic cross section in the horizontal direction, and FIG. Is a bird's-eye view.

  As already shown in FIG. 1, the bridge circuit 1, the two phase lines 4, 5 and the neutral line 9 are shown. The two phase lines 4 and 5 are each provided with insulating coatings 8 and 8 ′ for ensuring electrical insulation, and the neutral wire 9 is similarly provided with an insulating coating 8 ″. These insulating coatings 8, 8 ′, 8 ″ ensure electrical insulation from the outside.

  The bridge circuit 1 is attached to a single-phase three-wire commercial power supply line using a single-wire type power supply cable such as an IV cable provided with such insulating coatings 8, 8 ′, 8 ″. The bridge circuit 1 is made of an insulator (vinyl chloride, rubber, etc.), and clamps 2, 2 'hold the phase lines 4, 5 from above the insulating coatings 8, 8', respectively. A part of the circumference of the clamp portions 2 and 2 'is opened to form fastening portions 20 and 20'. The fastening portions 20 and 20 ′ are configured by two ribs 21 and 22 that face each other on a pair of surfaces, and the opposing surfaces of the ribs 21 and 22 are brought into close contact with each other by tightening screws 3 and 3 ′. By closely contacting, the inner diameters of the clamp portions 2, 2 ′ are also reduced (reduced) and mechanically adhered to the phase lines 4, 5. Although the screws 3 and 3 'are used as the fastening means, the present invention is not limited to this, and for example, a resin band or other clamping means may be used.

  The two clamp parts 2 and 2 ′ are connected to each other by a connecting part 23. The connecting portion 23 has a substantially U-shaped cross section and is fitted to the neutral wire 9, and a capacitor 6 is built therein as a component of the frequency filter of the bridge circuit 1. An overvoltage protection element may be used in place of the capacitor 6, and the withstand voltage and capacity of the capacitor 6 and the overvoltage protection element take into consideration the voltage, current and frequency flowing in the applied single-phase three-wire commercial power line. , Determined with a predetermined safety margin. In particular, it is preferable that the required safety margin is set according to the design intention, assuming that the dielectric strength or the like does not occur in the withstand voltage characteristics of the capacitor 6.

  Further, sharp needle-like conductive needles 10 and 10 ′ are connected to respective tip portions of both terminals of the capacitor 6. The conductive needles 10 and 10 'have respective tip portions projecting from the inner diameter portions of the clamp portions 2 and 2', and the inner diameters of the clamp portions 2 and 2 'are reduced. It penetrates and penetrates, reaches the internal conductors 7 and 7 'and becomes electrically conductive. Since the two phase lines 4 and 5 are conducted through the capacitor 6, a high-frequency power line carrier wave communication signal flows through the capacitor 6 and signal transmission is possible at the same time. Is blocked.

<Second Embodiment>
FIG. 4 shows a configuration diagram for describing a configuration according to the second embodiment of the bridge circuit connector. FIG. 4 shows the case where the bridge circuit 1 ′ is attached to the VVF cable 26 for the sake of explanation. The VVF cable 26 has two phase lines 4 and 5 and a neutral line 9 inside. These three wires are integrally formed by the insulating sheath 25.

  The VVF cable 26 is attached with a clamp portion 2 ″ from above the insulating sheath 25. As in the first embodiment already described, a fastening portion 20 is provided on the circumference of the clamp portion 2 ″. By tightening the screw 3, the inner diameter of the clamp portion 2 ″ is reduced. To the VVF cable 26.

  The bridge circuit 1 ′ has a capacitor 6, and the conductive needles 10, 10 ′ protrude from the inner diameter surface for the clamp portion 2 ″ to hold the VVF cable 26. The conductive needles 10 and 10 'penetrate through the insulating sheath 25 and the insulating coatings 8 and 8' to reach the internal conductors 7 and 7 ', respectively, and electrical conduction is ensured.

<Third Embodiment>
In FIG. 5, the block diagram for demonstrating the structure based on 3rd Embodiment of a bridge circuit connector is shown. The bridge circuit 1 ″ shown in FIG. 5 has the same configuration as that of the first embodiment already described, and the difference is that the capacitor 6 is configured to be detachable from the connecting portion 23 separately. . The capacitor 6 is enclosed in the detachable portion 11 fitted to the connecting portion 23, and the detachable portion 11 and the detachable portion 11 are detachable from the connecting portion 23. It is possible to replace the capacitor 6 with any other capacitor having specifications necessary for the capacitance value, withstand voltage, frequency characteristics, and the like of the capacitor 6.

  Similarly, FIG. 6 shows a bridge circuit 1 ′ ″ having the same configuration as the bridge circuit 1 ′ shown in the embodiment of FIG. 4 already described. The difference is that the capacitor 6 is detachably attached to the clamp portion. It is being fitted to 2 ″. Capacitor 6 is enclosed in detachable portion 12.

  The electrical connection between both terminals of the capacitor 6 enclosed in the detachable portions 11 and 12 and the end portions of the conductive needles 10 and 10 'on the connecting portion 23 side can be realized with an electrical contact structure. For example, it is preferable to use a combination of a plug and an outlet, or a metal contact that is pressed against the contact, and the contact is also preferably subjected to rust prevention processing that is resistant to corrosion such as moisture and gas.

<Fourth embodiment>
FIGS. 7 and 8 are configuration diagrams for explaining the configuration according to the fourth embodiment of the bridge circuit connector. FIG. 7 is a schematic cross-sectional view, and FIG. An overview is shown.

  The fastening to the phase lines 4 and 5 by the clamp parts 2 and 2 ′ and the configuration for ensuring the electrical conduction of the capacitor 6 by the conduction needles 10 and 10 ′ are the same as those in the first embodiment already described. is there. However, in the fourth embodiment, the neutral line 9 is arranged not parallel to the phase lines 4 and 5, and the bridge circuit 15 is fixed to the single-phase three-wire commercial power supply line. For this purpose, a connecting portion 14 is provided.

  The connecting portion 14 includes the capacitor 6 similarly to the connecting portion 23 shown in FIG. Further, the clamp portions 2 and 2 'are mechanically connected to each other, and the wiring from both terminals of the capacitor 6 and the conductive needles 10 and 10' are held inside. The capacitor 6 is enclosed in a detachable portion 13 and is detachably fitted. Since the connecting portion 14 does not use the neutral wire 9 for fixing itself, the bridge circuit 15 can be mounted when only two of the phase wires 4 and 5 are available.

  In the first to fourth embodiments described above, the conductive needles 10, 10 ′ and the insulating coatings 8, 8 ′ are in a state where the conductive needles 10, 10 ′ penetrate the insulating coatings 8, 8 ′. A foreign matter intrusion preventing means for preventing foreign matter such as moisture or corrosive gas from entering the contact surface or the periphery of the through hole may be provided.

  For example, the foreign matter intrusion preventing means can be applied by applying an adhesive sealing material to the tips and bases of the conductive needles 10 and 10 'before penetrating, or by applying a sealing material to the inner diameter surfaces of the clamp parts 2 and 2'. Can be realized.

  In addition, to make it easy to visually identify the type of electrical characteristics of the bridge circuit, the type of usable location, the year of manufacture, the expiration date, etc., this bridge circuit is color-coded, written with letters, numbers At least one of the protrusions for description, symbol description and identification may be implemented.

FIG. 9 shows the case where the voltage source E102 and the load Z _L 103 are connected to both ends of the phase lines 4 and 5 of the single-phase three-wire commercial power supply line in the first to fourth embodiments already described. An equivalent circuit diagram is shown.

In FIG. 9, a voltage source E102 is a single-phase three-wire commercial power supply or a power line carrier communication signal generator superimposed on the single-phase three-wire commercial power supply, and a broken line portion 100 is a bridge circuit 1, 1 ′, 1 ″, 1 ′. '', 15, and in this equivalent circuit, the capacitance of the capacitor 6 is represented by C101. Z _L 103 is the impedance of the load, I indicates a current input to the bridge circuit 100, and I ′ indicates a current flowing through the load.

FIG. 10 is a graph showing the transmission characteristics of a power line carrier communication signal transmitted by electrostatic coupling between two phase lines of a single-phase three-wire commercial power supply line. The electrostatic coupling capacitance between the two phase lines is 1 pF, and a current ratio I ′ / I at Z _L 103 = 200Ω is shown in the characteristic 111. Similarly, when the bridge circuit is used, the characteristic 112 shows the current ratio I ′ / I with C101 = 1 μF and Z _L 103 = 200Ω.

  The characteristic 112 when the bridge circuit is used is that the current flowing to C101 is almost zero in the 10 Hz to 100 Hz band including the power supply frequency. Moreover, most of the frequency flows in the C101 side in the frequency band of 1 to 30 MHz used in the power line carrier communication. Therefore, by setting the capacitance of the capacitor 6 (C101) to 1 μF, it is possible to realize a bridge circuit applicable to the inter-phase communication connection for power line carrier communication.

  FIG. 11 is an explanatory diagram for explaining an example when the bridge circuit according to the first to fourth embodiments is mounted. In FIG. 11, a bridge circuit 115 is disposed between a breaker 118 of a distribution board such as a house and an earth leakage breaker (main breaker) 117. The power line carrier communication signal is transmitted from the power company facility side, passes through the integrating wattmeter 116, and is conducted to the bridge circuit 115 through the leakage breaker 117. Further, it is transmitted from the power receiving consumer equipment side, passes through the child breaker 118, and is conducted to the bridge circuit 115.

The explanatory view for explaining the connection composition of a bridge circuit and a single phase 3 line type commercial power line concerning an embodiment of a bridge circuit connector is shown. The block diagram for demonstrating the structure based on 1st Embodiment of a bridge circuit connector is shown. The block diagram for demonstrating the structure based on 1st Embodiment of a bridge circuit connector is shown. The block diagram for demonstrating the structure based on 2nd Embodiment of a bridge circuit connector is shown. The block diagram for demonstrating the structure based on 3rd Embodiment of a bridge circuit connector is shown. The block diagram for demonstrating the structure based on 3rd Embodiment of a bridge circuit connector is shown. The block diagram for demonstrating the structure based on 4th Embodiment of a bridge circuit connector is shown. The block diagram for demonstrating the structure based on 4th Embodiment of a bridge circuit connector is shown. The equivalent circuit diagram which connected the voltage source and the load to the both ends of the phase line of the single phase three-wire type commercial power supply line based on the 1st-4th embodiment of a bridge circuit connector is shown. The transmission characteristics of the power line carrier communication signal transmitted by electrostatic coupling between the two phase lines of the single-phase three-wire commercial power line are shown in the graph. The explanatory view for explaining an example in the case of mounting the bridge circuit concerning the 1st-4th embodiment is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bridge circuit 2, 2 'Clamp part 3, 3' Screw 4, 5 Phase wire 6 Capacitor 9 Neutral wire 10, 10 'Conductive needle 11 Detachment part 23 Connection part

Claims (10)

A bridge circuit for blocking a low-frequency signal flowing in a single-phase three-wire commercial power line and passing a high-frequency signal used for power line carrier communication;
Connecting means for connecting and connecting the two phase lines constituting the single-phase three-wire commercial power supply line via the bridge circuit;
A bridge circuit connector comprising: The connecting means includes
A cable clamp having a circular opening for gripping each of the two phase lines;
The cable clamp is connected to the input / output terminal of the bridge circuit and protrudes from a surface that contacts the phase line, and passes through the insulating coating of the phase line and conducts to the conductor during the gripping. A needle-like conducting needle,
The bridge circuit connector according to claim 1, further comprising: The cable clamp is
3. The circumferential length can be adjusted by gripping each of the phase lines independently and shortening or extending the length of a missing section provided on the circumference of the circular opening by a fastening means. The bridge circuit connector according to 1. The cable clamp is
The two phase lines are held together and are characterized in that the circumferential length can be adjusted by shortening or extending the length of the missing section provided on the circumference of the circular opening by fastening means. The bridge circuit connector according to claim 2.   The bridge circuit connector according to any one of claims 2 to 4, wherein the bridge circuit excluding the conductive needle and the cable clamp are covered with an insulator.   The bridge circuit connector according to claim 1, wherein the bridge circuit is configured by any one or a combination of a capacitor and an overvoltage protection element.   The bridge circuit connector according to claim 6, wherein the capacitor has a predetermined withstand voltage characteristic that is preset with respect to a voltage of the single-phase three-wire commercial power supply line.   8. The foreign matter intrusion prevention means for preventing foreign matter from entering a hole formed through the insulating coating around the conductive needle is provided. The bridge circuit connector according to 1.   8. The bridge circuit connection according to claim 1, comprising at least one of color coding, letters, numbers, symbols, and protrusions that enables identification of the bridge circuit. 9. vessel. The bridge circuit is
The bridge circuit connector according to any one of claims 3 to 9, wherein the bridge circuit connector is configured separately from the cable clamp and is detachable from the cable clamp.

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