JP2009017492A - Plc blocking filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a PLC blocking filter which can be attached to an insulation-coated electrical wire without stopping power feeding caused by a power line and corresponds to the insulation-coated electrical wires with various thickness. <P>SOLUTION: An inductor unit 5 includes: an inductor case 10' constituted of a first body and a first cover that can be coupled so as to hold an insulation-coated electrical wire 3 therebetween; and a core 4 formed of a pair of core pieces 4a, 4b integrally held in the first body and the first cover, respectively, to hold the insulation-coated electrical wire 3 therebetween when the first body and the first cover are coupled. A capacitor unit 6 includes a housing 10 constituted of a second body 11 and a second cover 12 that can be coupled so as to insert the insulation-coated electrical wire 3 through an inserting hole 14, respectively, a contact 9 held by the second cover 12, protruded from the inner circumferential surface of the inserting hole 14 and electrically connected to a core wire 8 through a coating 7 of each insulation-coated electrical wire 3, respectively, and a capacitor element held by the second cover 12 and connected between the contacts 9. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is used for power line carrier communication that transmits a PLC signal of a predetermined frequency band using a power line as a transmission path, and is provided at a boundary between a section that transmits a PLC signal and a section that does not transmit a PLC signal on the power line to cut off the PLC signal. It relates to a blocking filter for use.

  Power line carrier communication (PLC) uses a power line that supplies AC power (commercial power) as a transmission line to perform communication using a PLC signal in a predetermined frequency band, so that a network can be easily constructed without the need for new wiring. Attention has been paid. The frequency band of the PLC signal is set to a frequency band sufficiently higher than the frequency of the AC power supply supplied through the power line. When performing the above power line carrier communication, for example, in a home, there is a possibility that a PLC signal may be transmitted if it is basically within the range where the power line is connected. There is.

  Here, when the same communication method is used between neighbors, communication control that does not cause interference by detecting each other's PLC signal or using a different code for each house so that the PLC signal does not interfere between neighbors. However, when different communication methods are used between neighbors, the PLC signals of each other inhibit communication as noise. Further, even when the same communication method is used between neighbors, it is affected by the communication traffic of neighbors, so that there is a possibility that sufficient performance cannot be exhibited. Furthermore, since there is a possibility that a malicious person may intentionally communicate with a neighbor, there is a problem that it is difficult to ensure the security of information handled in the house.

  In order to avoid these problems, as shown in FIG. 7, a PLC blocking filter that blocks the PLC signal in the predetermined frequency band (not shown) on the insulation-coated electric wire 3 connected as a power line to the main breaker 17 in the distribution board 2. In the following, measures are taken to insert 1) (referred to as “filter”) (for example, see Patent Document 1). Here, a load (including a terminal that communicates with a PLC signal) that receives power supply is connected to the main breaker 17 via the branch breaker 20 in the distribution board 2.

  The filter 1 described in Patent Document 1 is connected between two inductors L inserted in the single-phase three-wire voltage lines L1 and L2, and between the neutral line N and the voltage lines L1 and L2. It is constituted by two capacitor elements C. Here, the two inductors L are realized by two windings wound around a single core. Since a large current flows through each winding when supplying power to the load, the core does not saturate even if the large current flows by shifting the phase of the alternating current flowing through the two windings by 180 degrees. I am doing so.

  However, in order to attach the filter 1 having the above-described configuration to the insulation-coated electric wire 3 laid in advance, the insulation-coated electric wire 3 is cut or distributed to insert the inductor L in series with the insulation-coated electric wire 3. It is necessary to remove the insulation-coated wire 3 from the cable. Therefore, when the filter 1 is attached to the insulation-coated electric wire 3, the power supply by the power line is temporarily stopped (power failure), and the installation work of the filter 1 becomes large and the work becomes complicated. There is.

On the other hand, there has also been proposed a filter 1 that can be attached to an insulation-coated electric wire 3 used as a power line without stopping power supply by the power line (see, for example, Patent Document 2). The filter 1 described in Patent Literature 2 has a core formed by combining a core piece obtained by dividing a ring shape into two parts in a ring shape so that a part of the insulation coated electric wire 3 is inserted, and the insulation coating inserted through the core The inductor L is configured with the electric wire 3 itself as a coil. Further, the capacitor element C is connected between the tap connectors that are electrically connected to the insulation-coated electric wire 3 by being crimped to the insulation-coated electric wire 3.
JP-A-3-296313 (page 2-3) JP 2002-305422 A (page 2-3)

  However, in general tap connectors, the insulation-coated electric wires 3 that can be crimped are limited to those having a relatively thin wire diameter, and do not correspond to the insulation-coated electric wires 3 having various thicknesses. Therefore, the filter 1 described in Patent Document 2 cannot cope with the insulation-coated electric wires 3 having various thicknesses.

  The present invention has been made in view of the above-described reasons, and can be attached to an insulation-coated electric wire used as a power line without stopping power supply by the power line, and can be insulated with various thicknesses. It aims at providing the blocking filter for PLC corresponding to a covered electric wire.

  In the first aspect of the present invention, the power line is used for power line carrier communication for transmitting a PLC signal in a predetermined frequency band using the power line as a transmission path, and the PLC signal is provided at a boundary between a section for transmitting the PLC signal and a section for not transmitting on the power line. A blocking filter for PLC, which is an inductor part having a cylindrical core into which each of a plurality of insulation-coated wires used as the power line is inserted, and a capacitor connected between the insulation-coated wires A first body that can be coupled so as to hold a pair of core pieces forming the core integrally and sandwich each insulated wire between the pair of core pieces. And an inductor case comprising a first cover, and the capacitor portion can be coupled so as to sandwich a plurality of insulated wires. A housing comprising a second body and a second cover for holding the capacitor element and electrically connected to each terminal of each capacitor element, and being held on one of the second body and the second cover, And a contactor which penetrates each of the coatings and is electrically connected to the core wire.

  According to this configuration, when the blocking filter for PLC is attached to the insulation-coated electric wire, the first body and the first cover are connected to the inductor portion so that each insulation-coated electric wire is sandwiched between each pair of core pieces. Well, for the capacitor part, it is only necessary to connect the contactor to the core wire through the sheath of each insulation-coated electric wire in a state where the second body and the second cover are coupled so as to sandwich a plurality of insulation-coated wires. There is no need to cut the insulated wire. In short, the PLC blocking filter can be attached to the insulation-coated electric wire without stopping the power supply by the power line. In addition, since the contact is to be connected to the core wire through the insulation coated wire, the wire diameter of the connectable insulation coated wire is not limited to a relatively thin one like a tap connector, There is an advantage that it corresponds to an insulation covering electric wire of various thickness.

  According to a second aspect of the invention, in the first aspect of the invention, the pair of core pieces forming the core are integrally held by the second body and the second cover, respectively, and the housing is also used as the inductor case. It is characterized by.

  According to this configuration, since the housing is also used as the inductor case, when the second body and the second cover are joined, the insulation covered electric wire can be sandwiched between the pair of core pieces, and the inductor case is provided separately from the housing Compared with, the efficiency of the work of attaching the blocking filter for PLC to the insulation-coated electric wire is improved.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the contact element advances or retracts a front end portion from a surface facing the insulating covered electric wire in the one of the second body and the second cover. Thus, it is formed in the same shape as the tapping screw that is screwed into the housing, and is characterized in that it is connected to the core wire through the insulation-coated electric wire when tightened to the housing.

  According to this configuration, by tightening the contact with the housing, the tip of the contact breaks through the insulation-coated electric wire and comes into contact with the core wire of the insulation-coated electric wire. A connection can be established. Therefore, even if it is an insulation covering electric wire with a comparatively large wire diameter, there exists an advantage that a contactor can be connected easily. Also, the amount of protrusion of the contact can be adjusted by the amount of tightening of the contact with respect to the housing, so that the optimum protrusion that the tip of the contact reaches the core wire according to the thickness of the insulation coated wire coating. For example, even when a relatively thick insulation-coated electric wire is used when the allowable current of the insulation-coated electric wire is large, the contact can be reliably brought into contact with the core wire.

  According to a fourth aspect of the present invention, in the first or second aspect of the present invention, the contact has a second tip portion from a surface facing the insulating covered electric wire in the one of the second body and the second cover. It is formed in a needle shape that protrudes along the connecting direction of the body and the second cover, and is connected to the core wire through the sheath of the insulated wire by external force applied when the second body and the second cover are connected. It is characterized by that.

  According to this configuration, the tip of the needle-shaped contact breaks through the insulation-coated electric wire and contacts the core wire of the insulation-coated electric wire simply by connecting the second body and the second cover so as to sandwich the insulation-coated electric wire. In addition, the electrical connection between the insulated wire and the contact can be established, and the working efficiency is improved.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the insulating coated electric wire is connected to a primary side terminal of a main breaker, and the core is connected to the insulating coated electric wire. It is attached to the main breaker side with respect to the contact, and is held in the inductor case so that the distance between the central axes along the insertion direction of the insulated wire is the same distance as the primary terminal of the main breaker. It is characterized by that.

  According to this configuration, since the distance between the central axes of the core and the primary side terminal of the main breaker is matched, in the state where the insulating covered electric wires are connected to the main breaker, the distance between the insulating covered electric wires is the core. It becomes the same as the interval between each other, and the introduction of the insulation-coated electric wire to the core becomes easy.

  According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the pair of contacts respectively connected to the terminals of the capacitor element are electrically connected to the insulated wire. And an indicator for displaying whether or not a power supply voltage is applied between the pair of contacts when the contacts are connected.

  According to this configuration, whether or not the power supply voltage is applied between the pair of contacts can be confirmed on the display of the display, and therefore whether or not the contacts are securely connected between the insulated wires. It becomes possible to confirm.

  The invention of claim 7 is characterized in that, in the invention of any one of claims 1 to 6, the material of the core is selected from iron-based amorphous and carbonyl iron dust.

  According to this configuration, since the core is formed from a material having a small core loss and a high saturation magnetic flux density, the core is less likely to be saturated even when a large current flows through the insulation-coated electric wire, resulting in a stable inductance. Obtainable.

  In the present invention, when the PLC blocking filter is attached to the insulation-coated electric wire, the inductor body may be connected to the first body and the first cover so as to sandwich each insulation-coated electric wire between each pair of core pieces, As for the capacitor portion, the contactor may be connected to the core wire through the insulation coating wires in a state where the second body and the second cover are joined so as to sandwich a plurality of insulation coating wires. It is possible to attach to the insulated wire without stopping the power supply. In addition, since the contact penetrates the insulation-coated electric wire and is connected to the core wire, the contact can be applied to insulation-coated electric wires having various thicknesses.

(Embodiment 1)
A blocking filter for PLC (hereinafter abbreviated as “filter”) 1 (see FIG. 1) of the present embodiment includes a power inlet of an AC power source (commercial power source) and a distribution board 2 (see FIG. 1). 3 (see FIG. 1). This filter 1 is a power line carrier communication (PLC) that communicates with a PLC signal in a predetermined frequency band (for example, 2 to 30 MHz) using a power line for supplying an AC power supply (commercial power supply) as a transmission line. The circuit constant (inductance and capacitance) is designed so as to cut off the PLC signal in order to prevent the leakage of the signal. Therefore, the frequency band of the PLC signal is set to a cutoff frequency. In the following description, it is assumed that the AC power distribution method is a single-phase three-wire system that supplies single-phase AC power using a neutral wire N and two voltage wires L1 and L2. .

  As shown in FIG. 1, the filter 1 according to the present embodiment includes an inductor portion 5 having a cylindrical core 4 that surrounds a part of each insulated wire 3 and a capacitor connected between the insulated wires 3. And a capacitor unit 6 including the element C (see FIG. 3).

  The core 4 of the inductor section 5 is formed into a substantially cylindrical shape as a whole by combining a pair of semi-cylindrical core pieces 4a and 4b so that the opening surfaces face each other. The pair of core pieces 4a and 4b The same number (three in this case) of insulation-coated wires 3 is provided so as to sandwich each insulation-coated wire 3 between them. In short, the inductor unit 5 obtains an inductance by surrounding each insulated wire 3 with the core 4. The inductor unit 5 includes an inductor case 10 ′ (represented by a one-dotted line in FIG. 1) that integrally holds a pair of core pieces 4 a and 4 b constituting the core 4.

  The inductor case 10 'has a rectangular parallelepiped shape as shown in FIG. 2, and includes a first body 11' and a first cover 12 'that can be divided in the vertical direction of FIG. 2, and the first body 11' and the first cover 12 ′ are coupled to each other by coupling the fixing bases 11a ′ and 12a ′ projecting from the respective end faces in the longitudinal direction (left and right direction in FIG. 2) with screws 13 ′. Here, each of the pair of core pieces 4a and 4b constituting each core 4 is provided at each facing portion between the first body 11 ′ and the first cover 12 ′, and the first body 11 ′ and the first The cylindrical cores 4 are respectively formed in a state where the one cover 12 'is coupled. Furthermore, these cores 4 are the primary side terminals of the main breaker 17 (see FIG. 3) in which the distance between the central axes along the insertion direction of the insulated wire 3 is the connection terminal of the insulated wire 3 in the distribution board 2. It is held in the inductor case 10 ′ so as to have the same interval as T1 (see FIG. 3).

  In addition, instead of the fixing bases 11a ′ and 12a ′ provided at both ends in the longitudinal direction of the inductor case 10 ′, an engaging portion that engages with the claw and the claw is provided between the first body 11 ′ and the first cover 12 ′. You may make it couple | bond with 1st body 11 'and 1st cover 12' by providing in each and engaging a nail | claw with an engaging part. Alternatively, one end portion in the longitudinal direction of the inductor case 10 ′ may have a hinge structure, and the fixing bases 11 a ′ and 12 a ′, claws, and engaging portions may be provided only at the other end portion that can be opened and closed.

  Here, in order to avoid that the core 4 is saturated due to the current flowing through the insulated wire 3 and a desired inductance cannot be obtained, in this embodiment, the core 4 has a low core loss (magnetic core loss) and a high saturation magnetic flux density. Adopt iron-based amorphous or carbonyl iron dust. Further, the inductor section 5 obtains an inductance only by sandwiching the insulated wire 3 between the core pieces 4a and 4b, and the number of turns as the winding of the insulated wire 3 is one turn, and thus the inductance value is obtained by the number of turns. Since this is not possible, the core 4 having a large AL value (induction coefficient) is used.

  On the other hand, as shown in FIG. 1, the capacitor portion C is provided in the same number (three in this case) as the number of the insulated wires 3, and each of the contacts 9 can contact the core wire 8 through the sheath 7 of the insulated wire 3. And a rectangular parallelepiped housing 10 that can be opened and closed so as to sandwich the insulated wire 3. The sheath 7 of the insulated wire 3 is insulated and sheathed with polyvinyl chloride or polyethylene.

  The housing 10 includes a second body 11 and a second cover 12 that can be divided in the same manner as the inductor case 10 ′ of the inductor portion 5, and the second body 11 and the second cover 12 have respective longitudinal end faces (FIG. 1). The fixing bases 11a, 12a projecting in the right and left direction) are connected to each other by connecting with screws 13. Three sets of bowl-shaped sets of two concave grooves are provided on the opposing surfaces of the second body 11 and the second cover 12 so that the second body 11 and the second cover 12 are coupled together. An insertion hole 14 is formed in the mating surface of the second body 11 and the second cover 12 so as to be circularly opened by each set of concave grooves and into which the insulation-coated electric wire 3 can be inserted. That is, the 2nd body 11 and the 2nd cover 12 are couple | bonded so that each insulation covering electric wire 3 may be inserted | pinched in each insertion hole 14 formed between both.

  Instead of the fixing bases 11a and 12a provided at both ends of the housing 10, a claw and an engaging portion that engages with the claw are provided in each of the second body 11 and the second cover 12, and the claw is engaged with the engaging portion. The second body 11 and the second cover 12 may be coupled by being engaged with each other. Or you may make it provide the fixing bases 11a and 12a, a nail | claw, and an engaging part only in the other end part which can be opened and closed by making one end part of the longitudinal direction of the housing 10 into a hinge structure.

  The contacts 9 are held by the second cover 12 such that the respective tip portions protrude from the inner peripheral surface of the insertion hole 14 into the insertion hole 14. The contact 9 shown in FIG. 1 is formed in the same shape as a tapping screw that is screwed into the housing 10 so as to advance and retract the tip from the inner peripheral surface of the insertion hole 14 of the housing 10. 12, screw holes (not shown) for the contact 9 are respectively penetrated at portions corresponding to the respective insertion holes 14. Thus, the contact 9 constitutes a cover-through type clamp together with the housing 10 and is fastened to the second cover 12 so that the tip protruding into the insertion hole 14 is introduced into the insertion hole 14. The insulation-coated electric wire 3 is broken through the coating 7 to contact the core wire 8 of the insulation-coated electric wire 3 and is electrically connected to the insulation-coated electric wire 3. Therefore, the contact 9 can be easily connected with a small force even in the case of the insulation coated electric wire 3 having a large allowable current (for example, 500 A) and a relatively large diameter (for example, 20 mm) used in a factory, for example. .

  Since the protruding amount of the contact 9 from the inner peripheral surface of the insertion hole 14 can be arbitrarily adjusted by the tightening amount of the contact 9 with respect to the housing 10, the covering of the insulation covered electric wire 3 inserted through the insertion hole 14 is possible. In accordance with the thickness of the contact 7, the contact 9 can be protruded into the insertion hole 14 with an optimal protrusion amount so that the tip of the contact 9 reaches the core wire 8 and does not damage the core wire 8. Therefore, for example, even when a relatively thick insulation-coated electric wire 3 with a coating 7 is used when the allowable current of the insulation-coated electric wire 3 is large, the contact 9 and the core wire 7 of the insulation-coated electric wire 3 are securely connected. Can do.

  Inside the second cover 12 of the housing 10, a series circuit of a capacitor element (capacitor) C and a fuse F is connected between adjacent contacts 9 as shown in FIG. If the contactor 9 is electrically connected to the insulated wire 3, a series circuit of the capacitor element C and the fuse F is inserted and connected between the adjacent insulated wires 3. In this embodiment, the insulated wire 3 is inserted through the three insertion holes 14 of the housing 10 such that the center is the neutral wire N and both sides are the voltage wires L1 and L2, and therefore the capacitor element C is connected to the neutral wire N. And one voltage line L1, and between the neutral line N and the other voltage line L2. Here, the fuse F is connected to the voltage lines L1 and L2, and the capacitor element C is connected to the neutral line N. Further, each capacitor element C is connected in parallel with a surge absorbing element (ZNR) 15 that protects the capacitor element C from lightning surge.

  The filter 1 having the above configuration is attached so that the core 4 of the inductor unit 5 is closer to the distribution board 2 than the contact 9 of the capacitor unit 6 with respect to the insulation-coated electric wire 3.

  According to the configuration of the present embodiment described above, when the inductor portion 5 is inserted in series into the insulation-coated electric wire 3, each insulation-coated electric wire is provided by the inductor case 10 'so that the insulation-coated electric wire 3 is inserted through the core 4. Therefore, it is not necessary to cut the insulation-coated electric wire 3 or remove the insulation-coated electric wire 3 from the distribution board 2. Further, when connecting the capacitor unit 6 to the insulation-coated electric wire 3, the contactor 9 is used to connect the insulation-coated electric wire 3 with the second body 11 and the second cover 12 so as to sandwich the plurality of insulation-coated electric wires 3. Therefore, there is no need to cut the insulating coated electric wire 3 or remove the insulating coated electric wire 3 from the distribution board 2 because the tip of the contact 9 may be brought into contact with the core wire 8. In short, since it is possible to attach the filter 1 to the insulation-coated electric wire 3 without cutting the insulation-coated electric wire 3 or removing the insulation-coated electric wire 3 from the distribution board 2, power can be supplied through the insulation-coated electric wire 3. The filter 1 can be attached in the state in which it is being performed, and the workability of attaching the filter 1 is improved. Here, since the contact 9 penetrates the coating 7 of the insulated wire 3 and is connected to the core wire 8, the wire diameter of the connectable insulated wire 3 is relatively thin like a tap connector. It is not limited and can correspond to the insulation coated electric wire 3 of various thickness. In addition, since attachment of the filter 1 becomes easy also with respect to the existing insulation coating electric wire 3, the filter 1 can be easily introduce | transduced also to the house etc. which have already used power line carrier communication.

  Further, since the plurality of cores 4 are integrally held by the inductor case 10 ′, the plurality of cores 4 can be attached to the plurality of insulated sheathed wires 3 at a time. The workability at the time of construction is improved as compared with the case where the wires are individually attached to the insulation-coated wires 3. In addition, since the interval between the core 4 and the primary side terminal T1 of the main breaker 17 is matched, in the state where the insulating covered electric wire 3 is connected to the main breaker 17, the interval between the insulating covered electric wires 3 is between the cores 4 This makes it easier to introduce the insulated wire 3 into the core 4. Further, since it is used for the core 4 made of a material having a small core loss and a high saturation magnetic flux density, the core 4 is not easily saturated even when a large current flows through the insulation-coated electric wire 3, so that a stable inductance can be obtained. There is also an advantage of being able to do it. Furthermore, the capacitance of the capacitor unit 6 can be arbitrarily set simply by selecting and using an arbitrary capacitor element C from a plurality of types of capacitor elements C having different capacitances, and can be set to a relatively large capacitance. Therefore, the characteristics required for the filter 1 can be easily provided.

  Further, as shown in FIG. 4, a series circuit of a resistor R and a light emitting diode (LED) 16 is connected between both ends of the capacitor element C, and when a power supply voltage is applied between both ends of the capacitor element C, The light emitting diode 16 may be turned on. In FIG. 4, the light emitting diode 16 has an anode connected to the voltage lines L1 and L2 via a resistor R. Since the light emitting diode 16 is supplied with electric power when the contact 9 is connected to the insulated wire 3, the light is turned on. As a result, when the contact 9 is connected to the insulated wire 3, the contact 9 is insulated. Whether or not the light-emitting diode 16 is lit can be confirmed by visually observing whether or not it is connected to the electric wire 3. Therefore, there is an advantage that the reliability of the mounting operation of the filter 1 is improved. As shown in FIG. 1, the light-emitting diodes 16 are respectively disposed at respective portions between the insertion holes 14 on the one surface (the upper surface of the second cover 12 here) side of the housing 10.

  By the way, in the said embodiment, although the example which employ | adopted the contactor 9 same shape as a tapping screw was shown, it is not restricted to this structure, For example, the 2nd body 11 and 2nd from the inner peripheral surface of the insertion hole 14 of the housing 10 are shown. You may employ | adopt the needle-shaped contact 9 which protruded in the joining direction of 2 covers 12. FIG. In this configuration, the contact 9 is insulated so that the tip portion protruding into the insertion hole 14 is introduced into the insertion hole 14 only by coupling the second body 11 and the second cover 12 of the housing 10 by tightening the screw 13. The sheath 7 of the covered electric wire 3 is pierced and comes into contact with the core wire 8 to be electrically connected to the insulating covered electric wire 3. The contactor 9 only needs to be provided on at least one of the second cover 12 and the second body 11, and thus may be held by the second body 11 instead of the second cover 12. In this case, A circuit such as the capacitor element C is also held in the second body 11.

If a sufficient function (attenuation of PLC signal) as the filter 1 cannot be obtained by the inductor unit 5 and the capacitor unit 6 alone, a plurality of filters 1 may be provided on the same line (insulated coated wire 3). The necessary characteristics can be realized by simple construction. Alternatively, a configuration may be adopted in which each core 4 is securely fixed to the insulating coated electric wire 3 by sticking a sheet made of a material having a high frictional resistance such as a rubber material to the inner side surface of the core 4.
(Embodiment 2)
In the filter 1 of the present embodiment, as shown in FIG. 5, each pair of core pieces 4 a and 4 b forming a plurality of (here, three) cores 4 in the inductor section 5 includes the second body 11 and the second cover 12. Are different from the filter 1 of the first embodiment in that the housing 10 is also used as an inductor case.

  That is, in this embodiment, the three sets of core pieces 4 a and 4 b constituting the core 4 of the inductor unit 5 are held by the housing 10 of the capacitor unit 6. Here, each pair of core pieces 4a and 4b constituting each core 4 is provided on each facing surface of the second body 11 and the second cover 12, and the second body 11 and the second cover 12 are provided. The cylindrical cores 4 are respectively formed in a state where and are coupled. The respective cores 4 are arranged so as to be aligned with the insertion holes 14 along the insertion direction of the insulating covered electric wire 3, and the inductor case for holding the core 4 is provided separately from the housing 10 of the first embodiment. Compared to the configuration, the housing 10 of the present embodiment is enlarged by the amount of the core 4 in the insertion direction of the insulated wire 3. Furthermore, these cores 4 are arranged such that the distance between the central axes along the insertion direction of the insulated wire 3 is the same as the primary terminal T1 (see FIG. 3) of the main breaker 17 (see FIG. 3). ing.

  According to the configuration of the present embodiment, since the housing 10 of the capacitor unit 6 is also used as the inductor case of the inductor unit 5, the positional relationship between the inductor unit 5 and the capacitor unit 6 is fixed. In comparison with the case where the inductor portion 5 and the capacitor portion 6 are separately attached to the insulated wire 3, the performance as the filter 1 is easily ensured, and the workability is also improved.

  Other configurations and functions are the same as those of the first embodiment.

(Reference Example 1)
In the filter 1 of this reference example, as shown in FIG. 6, the capacitor unit 6 sandwiches the high dielectric material 18 between the insulated coated wires 3 and winds and fixes a band-shaped fixing band 19 around the high dielectric material 18. This is different from the filter 1 of the first embodiment. Here, the high dielectric material 18 is assumed to have a dielectric constant higher than the dielectric constant of the coating 7 of the insulated wire 3.

  That is, the capacitor unit 6 of the present reference example fills the gap between the core wires 8 of the adjacent insulated wires 3 with the coating 7 of the insulated wires 3 and the high dielectric material 18, thereby forming the gap between the core wires 8 of the adjacent insulated wires 3. In this case, a capacitance is generated. Since the capacitance between the insulated wires 3 is inversely proportional to the distance between the core wires 8 of the insulated wires 3 and proportional to the relative dielectric constant of the dielectric existing between the core wires 8, the interval between the adjacent insulated wires 3 can be reduced. The capacitance can be increased by increasing the relative permittivity of the dielectric existing between the core wires 8.

  Here, the sheath 7 of the insulated wire 3 is insulated and sheathed with polyvinyl chloride or polyethylene, and the relative dielectric constant of the sheath 7 and the relative dielectric of the high dielectric material 18 interposed between the insulated wires 3. The capacitance of the capacitor unit 6 is determined by the rate. Since the relative dielectric constant of polyvinyl chloride or polyethylene is about 2 to 2.4, a material having a relative dielectric constant larger than this value is used as the high dielectric material 18. In addition, when the core wire 8 of the insulation coated electric wire 3 is protected by a material having a relatively excellent insulation property such as polyvinyl chloride or polyethylene, the high dielectric material 18 sandwiched between the insulation coated electric wires 3 may be a metal. There is no problem in particular, and therefore, a relatively large capacitance can be obtained by sandwiching a material having high conductivity such as aluminum or copper between the insulated coated electric wires 3.

  Further, the surface of the high dielectric material 18 sandwiched between the insulated wires 3 has a concave shape that matches the outer diameter of the insulated wires 3, and thereby the high dielectric material 18 is brought into close contact with the coating 7 of the insulated wires 3. Can do. As a result, the dielectric constant between the core wires 8 of the insulation-coated electric wire 3 can be increased and the capacitance can be increased as compared with the case where a gap is generated between the coating 7 of the insulation-coated electric wire 3 and the high dielectric material 18. it can.

  As described in the first embodiment, a configuration in which a plurality of cores 4 are integrally held by one inductor case 10 '(see FIG. 2) may be employed as the inductor unit 5 of this reference example. Other configurations and functions are the same as those of the first embodiment.

It is a schematic perspective view which shows the structure of Embodiment 1 of this invention. It is a schematic perspective view which shows an inductor part same as the above. It is a schematic circuit diagram which shows a structure same as the above. It is a schematic circuit diagram which shows the other structure same as the above. It is a schematic perspective view which shows the structure of Embodiment 2 of this invention. It is a schematic perspective view which shows the structure of the reference example 1 of this invention. It is a schematic circuit diagram which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Blocking filter for PLC 3 Insulation covering electric wire 4 Core 4a, 4b Core piece 5 Inductor part 6 Capacitor part 7 Covering 8 Core wire 9 Contact 10 Housing 10 'Inductor case 11 2nd body 11' 1st body 12 2nd cover 12 ' First cover 14 Insertion hole 16 Light emitting diode (display)
17 Master breaker C Capacitor element T1 Primary side terminal

Claims (7)

  A blocking filter for PLC that is used for power line carrier communication that transmits a PLC signal of a predetermined frequency band using a power line as a transmission path, and is provided at a boundary between a section that transmits a PLC signal and a section that does not transmit a PLC signal on the power line. An inductor portion having a cylindrical core through which each of a plurality of insulated wires used as the power line is inserted, and a capacitor portion having a capacitor element connected between the insulated wires; And the inductor unit includes an inductor including a first body and a first cover that can be coupled so that the pair of core pieces forming the core are integrally held and the respective insulated coated electric wires are sandwiched between the pair of core pieces. A second body that has a case and is capable of being joined so as to sandwich a plurality of insulated wires; The housing is composed of two covers and is electrically connected to the terminals of the capacitor elements and the terminals of the capacitor elements, and is held by one of the second body and the second cover and penetrates the insulation coating wires. And a contactor electrically connected to the core wire.   2. The PLC according to claim 1, wherein the pair of core pieces forming the core are integrally held by the second body and the second cover, respectively, and the housing is also used as the inductor case. Blocking filter.   The contact is formed in the same shape as a tapping screw that is screwed into the housing so as to advance and retract a tip from a surface of the second body and the one of the second covers facing the insulating covered electric wire. The PLC blocking filter according to claim 1, wherein the PLC blocking filter is connected to a core wire through the insulation-coated electric wire by being tightened to the housing.   The contact is formed in a needle shape with a tip projecting from the surface of the one of the second body and the second cover facing the insulation-coated electric wire along the connecting direction of the second body and the second cover. The PLC according to claim 1, wherein an external force applied when the second body and the second cover are coupled is connected to the core wire through the coating of the insulated coated electric wire. Blocking filter.   The insulated wire is connected to a primary terminal of a main breaker, and the core is attached to the main breaker side of the contact with respect to the insulated wire, and extends along the insertion direction of the insulated wire. The PLC according to any one of claims 1 to 4, wherein the inductor case is held in the inductor case so that the distance between the central axes is the same distance as the primary terminal of the main breaker. Blocking filter.   Whether or not a power supply voltage is applied between the pair of contacts when electrically connected between the pair of contacts connected to each terminal of the capacitor element, and when the contact is connected to the insulation-coated wire The PLC blocking filter according to any one of claims 1 to 5, further comprising a display for displaying the above.   7. The PLC blocking filter according to claim 1, wherein a material of the core is selected from iron-based amorphous and carbonyl iron dust. 8.

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