JPWO2019239783A1 - Power supply, power line physical quantity measuring device and communication device - Google Patents

Abstract

Induced by electromagnetic induction based on the change in the magnetic flux generated in the power supply core by the power supply core (422) provided so as to surround the power supply line (100) and the current (I1) wound around the power supply core and flowing in the power line. A power supply current transformer unit (420) having a power supply coil (424) that generates a current (I2), and a power supply current transformer unit connected to the power supply current transformer unit, based on an induced current generated in the power supply current transformer unit. The power supply core includes a power supply unit (440) that supplies power to a predetermined load, and the power supply core is a power line when the current value of the current flowing through the power line is a predetermined current value equal to or less than the allowable current value of the power line. It is configured to be magnetically saturated with respect to the magnetic field generated by the current flowing through it.

Description

The present disclosure relates to a power supply device, a power line physical quantity measuring device, and a communication device.
This application claims priority based on the Japanese application "Japanese Patent Application No. 2018-11010" filed on June 11, 2018, and incorporates all the contents described in the Japanese application.

In order to obtain the required power in various devices mounted on the power line and executing the process, a current transformer unit that generates an induced current by electromagnetic induction from the magnetic field generated around the power line may be provided (for example, Patent Document 1). ..

Japanese Unexamined Patent Publication No. 7-294584

According to one aspect of the present disclosure
A power supply core provided so as to surround a power line, and a power supply that is wound around the power supply core and generates an induced current by electromagnetic induction based on a change in magnetic flux generated in the power supply core by a current flowing through the power line. A coil, a current transformer for power supply, and
A power supply unit connected to the power supply current transformer unit and supplying power to a predetermined load based on the induced current generated by the power supply current transformer unit.
With
The power supply core is configured to be magnetically saturated with respect to a magnetic field generated by the current flowing through the power line when the current value of the current flowing through the power line is a predetermined current value equal to or less than the allowable current value of the power line. A power supply is provided.

According to another aspect of the present disclosure.
A power supply core provided so as to surround a power line, and a power supply that is wound around the power supply core and generates an induced current by electromagnetic induction based on a change in magnetic flux generated in the power supply core by a current flowing through the power line. A coil, a current transformer for power supply, and
A power supply unit connected to the power supply current transformer unit and supplying power based on the induced current generated in the power supply current transformer unit.
On the outside of the power line, the current transformer unit for power supply and the main body unit that holds the power supply unit,
With
The main body
The inner cylinder through which the power line is inserted and the inner cylinder
An outer cylinder provided so as to surround the outer circumference of the inner cylinder and accommodating the current transformer unit for power supply and the power supply unit between the inner cylinder and itself.
Have,
The inner cylinder is provided with a power supply device that is vertically separated into at least two.

According to yet another aspect of the present disclosure.
A power supply core provided so as to surround a power line, and a power supply that is wound around the power supply core and generates an induced current by electromagnetic induction based on a change in magnetic flux generated in the power supply core by a current flowing through the power line. A coil, a current transformer for power supply, and
A power supply unit connected to the power supply current transformer unit and supplying power based on the induced current generated in the power supply current transformer unit.
A physical quantity measuring unit that measures a physical quantity related to the power line by the electric power supplied from the power supply unit, and a physical quantity measuring unit.
With
The power supply core is configured to be magnetically saturated with respect to a magnetic field generated by the current flowing through the power line when the current value of the current flowing through the power line is a predetermined current value equal to or less than the allowable current value of the power line. A power line physical quantity measuring device is provided.

According to yet another aspect of the present disclosure.
A power supply core provided so as to surround a power line, and a power supply that is wound around the power supply core and generates an induced current by electromagnetic induction based on a change in magnetic flux generated in the power supply core by a current flowing through the power line. A coil, a current transformer for power supply, and
A power supply unit connected to the power supply current transformer unit and supplying power based on the induced current generated in the power supply current transformer unit.
With the communication unit that communicates predetermined information by the electric power supplied from the power supply unit,
With
The power supply core is configured to be magnetically saturated with respect to a magnetic field generated by the current flowing through the power line when the current value of the current flowing through the power line is a predetermined current value equal to or less than the allowable current value of the power line. The communication device to be used is provided.

It is a schematic block diagram which shows the power supply apparatus which concerns on 1st Embodiment of this disclosure. It is a schematic diagram which shows the magnetization characteristic of the power-source core. It is a figure which shows the waveform of the induced current generated by the power supply coil. It is a figure which shows the waveform of the induced current generated by the power supply coil. It is a schematic perspective view which shows the power line physical quantity measuring apparatus which concerns on 2nd Embodiment of this disclosure. It is a block diagram which shows the power line physical quantity measuring apparatus which concerns on 2nd Embodiment of this disclosure. It is a front view which shows the power line physical quantity measuring apparatus which concerns on 2nd Embodiment of this disclosure. It is a side view which shows the power line physical quantity measuring apparatus which concerns on 2nd Embodiment of this disclosure. 6A is a cross-sectional view taken along the line AA of FIG. 6A. It is a rear view which shows the power line physical quantity measuring apparatus which concerns on 2nd Embodiment of this disclosure. FIG. 7A is a cross-sectional view taken along the line BB of FIG. 7A. It is a schematic diagram which shows the magnetization characteristic of the power-source core and the magnetization characteristic of the current measurement core. It is the schematic which shows the current transformer part for a power source. It is the schematic which shows the current transformer part for current measurement. It is a block diagram which shows the communication apparatus which concerns on 3rd Embodiment of this disclosure. It is a schematic block diagram which shows the power line physical quantity measuring apparatus which concerns on 4th Embodiment of this disclosure. It is a schematic block diagram which shows the communication system which concerns on 4th Embodiment of this disclosure.

[Issues to be solved by this disclosure]
An object of the present disclosure is to provide a technique capable of obtaining stable electric power from a magnetic field generated around a power line.

[Effect of the present disclosure]
According to the present disclosure, stable electric power can be obtained from a magnetic field generated around a power line.

[Explanation of Embodiments of the present disclosure]
<Findings obtained by the inventor>
First, the findings obtained by the inventor will be described.

(I) Knowledge on Magnetization Characteristics of Current Transformer Unit The current transformer unit attached to the power line includes, for example, a core and a coil. A predetermined electric power can be obtained by generating an induced current in the coil by electromagnetic induction from a magnetic field generated in the core.

The value of the current flowing through the power line fluctuates in real time depending on the amount of power generation and the demand for power. On the other hand, the power required for various devices mounted on the power line does not depend on the current value flowing through the power line. Therefore, a power supply device in which the amount of power generation does not fluctuate regardless of the value of the current flowing through the power line is desired.

However, in the power supply device, since the induced current is proportional to the current flowing through the power line, if the current value flowing through the power line is small, it is not possible to secure the power required for the load connected to the current transformer unit. Therefore, when the current value of the current flowing through the power line is the lower limit of the fluctuation range (operating range) in which the peak value of the current of the power line can fluctuate, the current transformer unit is provided so that sufficient power can be obtained in the load. And the power supply is designed.

On the other hand, when the magnetic flux density generated in the core of the current transformer unit is configured to monotonically increase (that is, not magnetically saturate) with respect to the magnetic field strength generated around the power line, the current value of the current is the upper limit of the fluctuation range. As it approached the value, it was possible to generate unnecessary excess power for the load. When excessive power is generated, there is a possibility that excessive heat generation may occur in the load or the wiring connected to the load. Therefore, it has been desired to reduce the influence of fluctuations in the current value flowing through the power line on the amount of power generation.

(Ii) Knowledge about the influence of the main body (housing) on the power generation efficiency The current transformer is housed in, for example, a metal cylindrical main body. The main body portion has, for example, an inner cylinder through which a power line is inserted and an outer cylinder that accommodates a current transformer portion between the inner cylinder and itself.

Here, the inventors have found that if the current transformer portion is housed in the metal main body portion, the power generation efficiency in the current transformer portion may decrease.

It is considered that this is because the metal main body part in which the current transformer part is housed forms a metal one-turn loop (separate from the coil of the current transformer part) around the core of the current transformer part. Be done.

Based on the above findings (i) and (ii), a technique capable of obtaining stable power from a magnetic field generated around a power line has been desired.

The present disclosure is based on the above findings found by the inventors.

<Embodiment of the present disclosure>
Next, embodiments of the present disclosure will be listed and described.

[1] The power supply device according to one aspect of the present disclosure is
A power supply core provided so as to surround a power line, and a power supply that is wound around the power supply core and generates an induced current by electromagnetic induction based on a change in magnetic flux generated in the power supply core by a current flowing through the power line. A coil, a current transformer for power supply, and
A power supply unit connected to the power supply current transformer unit and supplying power to a predetermined load based on the induced current generated by the power supply current transformer unit.
With
The power supply core is configured to be magnetically saturated with respect to a magnetic field generated by the current flowing through the power line when the current value of the current flowing through the power line is a predetermined current value equal to or less than the allowable current value of the power line. Will be done.
According to this configuration, stable power can be obtained from the magnetic field generated around the power line.

[2] In the power supply device according to the above [1],
In the magnetization curve shown by the power supply core, the current value of the power line when the magnetic field strength generated around the power line becomes the magnetic saturation point is the lower limit of the fluctuation range of the peak value of the current flowing through the power line. It is within ± 10%.
According to this configuration, the magnetic saturation of the power supply core can be obtained over substantially the entire fluctuation range of the current peak value of the power line.

[3] In the power supply device according to the above [1] or [2].
A main body unit for holding the power supply current transformer unit and the power supply unit is provided outside the power line.
The main body
The inner cylinder through which the power line is inserted and the inner cylinder
An outer cylinder provided so as to surround the outer circumference of the inner cylinder and accommodating the current transformer unit for power supply and the power supply unit between the inner cylinder and itself.
Have,
The inner cylinder is separated into at least two in the axial direction.
According to this configuration, it is possible to suppress a decrease in power generation efficiency due to the CT unit for power supply.

[4] The power supply device according to another aspect of the present disclosure is
A power supply core provided so as to surround a power line, and a power supply that is wound around the power supply core and generates an induced current by electromagnetic induction based on a change in magnetic flux generated in the power supply core by a current flowing through the power line. A coil, a current transformer for power supply, and
A power supply unit connected to the power supply current transformer unit and supplying power based on the induced current generated in the power supply current transformer unit.
On the outside of the power line, the current transformer unit for power supply and the main body unit that holds the power supply unit,
With
The main body
The inner cylinder through which the power line is inserted and the inner cylinder
An outer cylinder provided so as to surround the outer circumference of the inner cylinder and accommodating the current transformer unit for power supply and the power supply unit between the inner cylinder and itself.
Have,
The inner cylinder is separated into at least two in the axial direction.
According to this configuration, it is possible to suppress a decrease in power generation efficiency due to the CT unit for power supply.

[5] In the power supply device according to any one of the above [1] to [4].
A main body unit for holding the power supply current transformer unit and the power supply unit is provided outside the power line.
The main body is divided in half along the axial direction.
The power supply coil and the power supply unit are housed inside one of the main body portions divided into two.
According to this configuration, the structure of the power line physical quantity measuring device can be simplified.

[6] In the power supply device according to any one of the above [1] to [5].
The power supply core has a pair of half-split cores that are split in half along the axial direction.
At least one of the pair of half cores
The end of the pair of half cores that are joined together with the other
A straight portion extending linearly toward the end and a straight portion
Have.
According to this configuration, a pair of half-split cores among the power supply cores can be stably coupled to each other.

[7] In the power supply device according to any one of the above [1] to [6].
A voltage induced by electromagnetic induction based on a change in magnetic flux generated in the current measurement core by a current measurement core provided so as to surround the power line and the current flowing in the current measurement core wound around the current measurement core. A current measuring coil, which has a current measuring coil, and a current transformer section for measuring a current.
A current measuring unit connected to the current transformer unit for current measurement and measuring the current flowing through the power line based on the induced voltage output by the current transformer unit for current measurement.
With
The current measuring core is configured so as not to be magnetically saturated with respect to the magnetic field generated by the current flowing through the power line within a range in which the current value of the current flowing through the power line is equal to or less than the allowable current value of the power line.
According to this configuration, the measurement accuracy of the current can be improved.

[8] The power line physical quantity measuring device according to still another aspect of the present disclosure is
A power supply core provided so as to surround a power line, and a power supply that is wound around the power supply core and generates an induced current by electromagnetic induction based on a change in magnetic flux generated in the power supply core by a current flowing through the power line. A coil, a current transformer for power supply, and
A power supply unit connected to the power supply current transformer unit and supplying power based on the induced current generated in the power supply current transformer unit.
A physical quantity measuring unit that measures a physical quantity related to the power line by the electric power supplied from the power supply unit, and a physical quantity measuring unit.
With
The power supply core is configured to be magnetically saturated with respect to a magnetic field generated by the current flowing through the power line when the current value of the current flowing through the power line is a predetermined current value equal to or less than the allowable current value of the power line. Will be done.
According to this configuration, the magnetic saturation of the power supply core makes it possible to stably maintain the power supply from the power supply CT unit to the physical quantity measuring unit.

[9] The communication device according to still another aspect of the present disclosure is
A power supply core provided so as to surround a power line, and a power supply that is wound around the power supply core and generates an induced current by electromagnetic induction based on a change in magnetic flux generated in the power supply core by a current flowing through the power line. A coil, a current transformer for power supply, and
A power supply unit connected to the power supply current transformer unit and supplying power based on the induced current generated in the power supply current transformer unit.
With the communication unit that communicates predetermined information by the electric power supplied from the power supply unit,
With
The power supply core is configured to be magnetically saturated with respect to a magnetic field generated by the current flowing through the power line when the current value of the current flowing through the power line is a predetermined current value equal to or less than the allowable current value of the power line. Will be done.
According to this configuration, the magnetic saturation of the power supply core makes it possible to stably maintain the power supply from the power supply CT unit to the communication unit.

[Details of Embodiments of the present disclosure]
Next, one embodiment of the present disclosure will be described below with reference to the drawings. It should be noted that the present invention is not limited to these examples, and is indicated by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

<First Embodiment of the present disclosure>
(1) Power Supply Device A power supply device 10 according to the first embodiment of the present disclosure will be described. FIG. 1 is a schematic configuration diagram showing a power supply device according to the present embodiment.

As shown in FIG. 1, the power supply device 10 of the present embodiment is configured to generate a predetermined power by utilizing electromagnetic induction from the power line 100, and is, for example, a power supply current transformer unit (power supply CT unit) 420. And a power supply unit (power supply circuit unit) 440. In the following, the term "current transformer" may be abbreviated as "CT".

(Power line)
In the present disclosure, the "power line 100" means a linear body that transmits electric power, and includes, for example, an overhead power transmission line (Overhead Transmission Line) and a power cable (Power Cable). Includes.

In the present embodiment, the power line 100 is configured as, for example, a so-called overhead power transmission line. Specifically, the power line 100 is, for example, a steel core aluminum stranded wire (ACSR) or the like. In this case, the power line 100 is provided as, for example, a central portion that bears the tension at the time of overhead wire and a plurality of strands twisted so as to cover the outer circumference of the central portion, and is configured as a conductor through which a current at the time of power transmission flows. It has a stranded wire layer. The strands constituting the central portion are, for example, aluminum covered steel wires (AC wires). The strands constituting the stranded wire layer are made of, for example, aluminum (Al) or an Al alloy.

(CT section for power supply)
The power supply CT unit 420 includes, for example, a power supply core 422 and a power supply coil 424. The power supply core 422 is provided in an annular shape so as to surround the outer circumference of the power line 100. Further, the power supply core 422 is made of a magnetic material. The magnetic material constituting the power supply core 422 is, for example, ferrite. The power supply coil 424 is spirally wound around at least a part of the power supply core 422. With such a configuration, an induced current can be generated in the power supply coil 424 by electromagnetic induction based on the change in the magnetic flux generated in the power supply core 422 around the power line 100 by the current flowing through the power line 100.

(Power supply part)
The power supply unit 440 is connected to, for example, the power supply CT unit 420, and is configured to supply electric power to a predetermined load (not shown) based on the induced current generated by the power supply CT unit 420. .. Specifically, the power supply unit 440 includes, for example, a protection unit (not shown), a rectifying unit (not shown), and a constant voltage circuit unit (waveform shaping unit) (not shown). For example, when a surge voltage is applied to the power supply unit 440, the protection unit is configured to release the surge current so that the surge current does not flow to the load. The rectifying unit is configured to convert (rectify) AC power based on the induced current generated by the power supply CT unit 420 into DC power suitable for the load, for example. Further, the constant voltage circuit unit has, for example, a function of adjusting the DC voltage generated by the rectifying unit to a constant voltage suitable for the load.

(Magnetization characteristics of power supply core)
Next, with reference to FIG. 2, the magnetization characteristics of the power supply core 422 of the power supply CT unit 420 will be described. FIG. 2 is a schematic view showing the magnetization characteristics of the power supply core.

Here, the magnetic field strength H generated around the power line 100 is the current I flowing through the power line 100.₁Is proportional to the current value of. Current I₁Usually has a sinusoidal waveform, so the magnetic field strength H is the current I. ₁It will have a sine wave waveform proportional to. In such a change in the magnetic field strength H, the magnetic flux Φ changes in the power supply core 422. Therefore, according to the following equation (1), the induced current I in the power supply coil 424 by electromagnetic induction is based on the amount of change in the magnetic flux Φ generated in the power supply core 422.₂Will occur.
I₂= (N / R) (dΦ / dt) ・ ・ ・ (1)
However, N is the number of turns of the power supply coil 424, and R is the resistance value (Ω) of the load.

Therefore, in the present embodiment, an increase in the magnetic flux Φ generated in the power supply core 422 is suppressed so that an _{excessive induced current I 2 is not generated in the power supply coil 424.}

Specifically, as shown in FIG. 2, the power supply core 422 of the present embodiment is, for example, when _{the current value of the current I 1} flowing through the power line 100 is a predetermined current value equal to or less than the allowable current value of the power line 100. In addition, it is configured to be magnetically saturated with respect to the magnetic field generated around the power line 100 by the current flowing through the power line 100. As a result, it is possible to suppress the generation of excessive electric power.

The term "magnetic saturation" as used herein means that the magnetic flux density B is constantly saturated with respect to the magnetic field strength H.

Further, the "allowable current value" here means the maximum value of the _{current I 1} that can be passed through the power line 100 (without damage). The "maximum magnetic field strength" in FIG. 2 means the maximum value of the magnetic field strength generated around the power line 100 when the current value of the power line 100 is an allowable current value.

The magnetization characteristic (magnetization curve) of the power supply core 422 has, for example, a monotonically increasing region MR1, a magnetic saturation point SP1, and a saturation region SR1. The monotonically increasing region MR1 is, for example, a region in which the magnetic flux density B monotonically increases with respect to the magnetic field strength H. The saturation region SR1 is, for example, a region in which the magnetic flux density B saturates substantially with respect to the magnetic field strength H. The magnetic saturation point SP1 is, for example, a point where the monotonically increasing region MR1 changes to the saturation region SR1 with respect to the magnetic field strength H. In other words, the magnetic saturation point SP1 is, for example, an inflection point of the slope of the magnetic flux density B with respect to the magnetic field strength H.

In the power supply core 422 of the present embodiment, for example, the magnetic saturation point SP1 is located at the _{maximum magnetic field strength Hp or less. That is, when the current value of the current I 1} flowing through the power line 100 is a predetermined current value equal to or less than the allowable current value of the power line 100, the power supply core 422 is magnetically saturated.

Here, the magnetic material has an inherent maximum magnetic flux density. According to the magnetization characteristics of the magnetic material, even if the magnetic field strength becomes larger than the magnetic saturation point, the magnetic flux density is saturated without becoming higher than the maximum magnetic flux density. The magnetic saturation point depends on the material of the magnetic material, the cross-sectional area of the magnetic material, the number of coil turns, and the like.

The power supply core 422 of the present embodiment is made of, for example, _{a magnetic material that magnetically saturates when the current value of the current I 1} flowing through the power line 100 is a predetermined current value equal to or less than the allowable current value of the power line 100. For example, a predetermined magnetic saturation can be realized by selecting a predetermined magnetic element constituting the magnetic material or adjusting the composition ratio of the magnetic element.

Alternatively, when the material of the magnetic material constituting the power supply core 422 is determined, in the power supply core 422 of the present embodiment, for example, _{the current value of the current I 1} flowing through the power line 100 is the allowable current value of the power line 100. It may have a cross-sectional area adjusted to be magnetically saturated when the following predetermined current values are obtained.

Alternatively, when the material of the magnetic material constituting the power supply core 422 is determined, the power supply core 422 of the present embodiment has, for example, a pair of half-split cores that are split in half along the axial direction. , A pair of half-split cores may be separated from each other by a predetermined gap. The definition of "divided in half along the axial direction" will be described later. In this case, the gap between the pair of half-split cores is such that when _{the current value of the current I 1} flowing through the power line 100 is a predetermined current value equal to or less than the allowable current value of the power line 100, the power supply core 422 is magnetically saturated. It is adjusted to be.

When the power supply core 422 is magnetically saturated as described above, the magnetic flux density B of the power supply core 422 becomes constant, so that the amount of change in the magnetic flux Φ of the power supply core 422 becomes zero. Therefore, from the above equation (1), the induced current I ₂ generated in the power supply coil 424 becomes 0 (A). As a result, _{the waveform of the induced current I 2} deviates from the sine wave.

_{Specifically, the waveform of the induced current I 2} generated in the power supply coil 424 when the power supply core 422 is magnetically saturated will be described with reference to FIGS. 3A and 3B. 3A and 3B are diagrams showing waveforms of the _{induced current I 2} generated in the power supply coil. 3A and 3B show waveforms _{of the induced current I 2} when a predetermined linear resistor is connected to the power supply coil 424. Further, in FIGS. 3A and 3B, when _{the current value of the current I 1 is} a current value in which the magnetic field strength is near the magnetic saturation point SP1, and in the current value of the current I ₁ , the magnetic field strength is the saturation region SR1. _{The waveform of the induced current I 2} at the time of the inner current value is shown. The current value of the current I ₁ is equal to or less than the allowable current value.

As shown in FIGS. 3A and 3B, when _{the current value of the current I 1} flowing through the power line 100 is a predetermined current value equal to or less than the allowable current value of the power line 100, the power supply core 422 is magnetically saturated, for example. _{As the current value of the current I 1} flowing through the power line 100 _{increases, the waveform of the induced current I 2} generated by the power supply coil 424 can be made into a waveform in which a part of the sinusoidal wave is missing, and can be deviated from the sinusoidal wave. .. By using the waveform of the induced current I ₂ as the above waveform, as the current value _{of the current I 1 increases, the integrated value obtained by integrating the current values of the induced current I 2} is calculated as the induced current without magnetic saturation of the power supply core 422. When I ₂ is obtained as a sinusoid, _{the current value of the induced current I 2} can be reduced from the integrated value obtained by integrating the current values. _{That is, even if the current I 1} flowing through the power line increases, it is possible to suppress the generation of excessive power that is not necessary for the load.

The above-mentioned "when the power supply core 422 is not magnetically saturated and the induced current I ₂ is obtained as a sine wave" means that the inclination of the monotonous increase region MR1 in the magnetization characteristics of the power supply core 422 is the actual monotonous increase region MR1. equal to the slope of the magnetic saturation point SP1 is a higher than the maximum magnetic field strength H _p, induced current I ₂ which means that if obtained as a sine wave.

Further, as shown in FIG. 3B, when _{the current value of the current I 1} flowing through the power line 100 is a predetermined current value equal to or less than the allowable current value of the power line 100, the power supply core 422 is magnetically saturated, for example. When the absolute value of the current value of the induced current I ₂ decreases from the peak value (induced current peak value, PK), the slope of (DT) increases, and the absolute value of the current value of the _{induced current I 2 increases to the peak value (PK).} It can be steeper than the tilt of (UT). By sharply lowering the absolute value of the current value of the induced current I _{2, a part of the sine wave can be surely lost.} As a result, it is possible to suppress the generation of excessive electric power.

Further, as shown in FIG. 3B, power core 422 is magnetically saturated, by variation of the magnetic flux Φ is zero in the formula (1) described above, the waveform of the induced current I _2, the induced current I ₂ It has a zero current region (ZT) in which the current value of the _{induced current I 2} becomes constant at about 0 A for a predetermined time after the absolute value of the current value of is lowered from the peak value. Since the waveform of the induced current I ₂ has a zero current region (ZT), it is possible to reliably secure the time when a part of the sine wave is missing. As a result, the generation of excessive electric power can be stably suppressed.

As shown in FIGS. 3A and 3B, even if _{the waveform of the induced current I 2} generated in the power supply coil 424 is a waveform in which a part of the sine wave is missing, the power supply unit 440 provides a current suitable for the load. It will be shaped into the waveform (constant current waveform) of.

_{Further, in the power supply core 422 showing the waveform of the induced current I 2} shown in FIGS. 3A and 3B, for example, when the magnetic field strength generated around the power line 100 in the magnetization curve shown by the power supply core 422 becomes the magnetic saturation point. The current value of the current I ₁ of the power line 100 is within ± 10% of the lower limit of the fluctuation range of the peak value of the _{current I 1 flowing through the power line 100.}

_{The "fluctuation range of the peak value of the current I 1} flowing through the power line 100" here means the power line 100 due to fluctuations in the power supply status from the power plant, fluctuations in the power usage status on the load side, fluctuations in temperature, and the like. It means the range in which the peak value of the flowing current I _{1 can fluctuate.}

As described above, the current value of the current I ₁ of the power line 100 when the magnetic field intensity becomes the magnetic saturation point in the magnetization curve showing the power core 422 with respect to the lower limit value of the fluctuation range of the peak value of the current I ₁ By setting the value to ± 10% or less, the magnetic saturation of the power supply core 422 can be obtained over substantially the entire fluctuation range of the peak value of _{the current I 1 of the power line 100.} That is, as soon as the current value of the current I ₁ of the power line 100 becomes larger than the lower limit value of the fluctuation range, the power supply core 422 can be magnetically saturated. If the power supply CT unit 420 and the power supply unit 440 are designed so that sufficient power can be obtained when the current value of the _{current I 1} is the lower limit of the fluctuation range, the above-mentioned above regarding the peak value of the _{current I 1} It is possible to suppress the supply of unnecessary excess power to the load over substantially the entire fluctuation range.

(2) Effects of the present embodiment According to the present embodiment, one or more of the following effects are exhibited.

The power supply core 422 is configured to be magnetically saturated with respect to the magnetic field generated around the power line 100 when the current value of the _{current I 1} flowing through the power line 100 is a predetermined current value equal to or less than the allowable current value of the power line 100. Has been done. As a result, as the current value _{of the current I 1 increases, the waveform of the induced current I 2} can be made into a waveform in which a part of the sine wave is missing, and can be deviated from the sine wave. By using the waveform of the induced current I ₂ as the above waveform, as the current value _{of the current I 1 increases, the integrated value obtained by integrating the current values of the induced current I 2} is calculated as the induced current without magnetic saturation of the power supply core 422. When I ₂ is obtained as a sinusoid, _{the current value of the induced current I 2} can be reduced from the integrated value obtained by integrating the current values. Further, when the current value of the _{current I 1} becomes large, the rate of increase of the integrated value obtained by integrating the current value _{of the induced current I 2} is made smaller than the rate of increase of the integrated value obtained by integrating the current value of the _{current I 1.} be able to. That is, even if the current I ₁ flowing through the power line 100 increases, it is possible to suppress the generation of excessive power that is not necessary for the load. As a result, stable electric power can be obtained.

By obtaining stable electric power from the power supply CT unit 420, it is possible to suppress excessive heat generation in the load or the wiring connected to the load. As a result, damage to the load, wiring, or the like can be suppressed. As a result, the power supply by the power supply device 10 can be stably maintained, and the power supply device 10 can be operated semi-permanently.

<Second Embodiment of the present disclosure>
(1) Power Line Physical Quantity Measuring Device The power supply device 10 in the above-described first embodiment can be applied as, for example, a power line physical quantity measuring device 12. It may be considered that the power supply device 10 of the first embodiment described above and the communication device 14 of the third embodiment described later are incorporated in the power line physical quantity measuring device 12.

Hereinafter, the power line physical quantity measuring device 12 according to the present embodiment will be described with reference to FIGS. 4 to 10. FIG. 4 is a schematic perspective view showing the power line physical quantity measuring device according to the present embodiment. FIG. 5 is a block diagram showing a power line physical quantity measuring device according to the present embodiment. FIG. 6A is a front view showing the power line physical quantity measuring device according to the present embodiment. FIG. 6B is a side view showing the power line physical quantity measuring device according to the present embodiment. FIG. 6C is a cross-sectional view taken along the line AA of FIG. 6A. FIG. 7A is a rear view showing the power line physical quantity measuring device according to the present embodiment. FIG. 7B is a cross-sectional view taken along the line BB of FIG. 7A. FIG. 8 is a schematic diagram showing the magnetization characteristics of the power supply core and the magnetization characteristics of the current measurement core. FIG. 9 is a schematic view showing a current transformer unit for power supply. FIG. 10 is a schematic view showing a current transformer unit for current measurement.

In the following, the "axial direction" of the power line 100 or the like means a direction along the central axis of the power line 100 or the like, and can be paraphrased as a longitudinal direction of the power line 100 or the like in some cases. Further, the "diameter direction" of the power line 100 or the like means a direction perpendicular to the axial direction of the power line 100 or the like, and in some cases, it can be paraphrased as a short direction of the power line 100 or the like. Further, the "circumferential direction" of the power line 100 or the like means a direction along the outer circumference of the power line 100 or the like.

Further, in each figure, the "X direction" means a direction perpendicular to the axial direction of the power line 100 and a horizontal direction, and the direction from the central axis of the main body portion 300 toward the hinge portion 370 is defined as the "+ X direction". .. Further, the "Y direction" means the axial direction and the horizontal direction of the power line 100, and the direction from the clamp 700 to the main body 300 is defined as the "+ Y direction". Further, the "Z direction" means the vertical direction, and the vertically upward direction is the "+ Z direction".

The power line physical quantity measuring device 12 of the present embodiment is attached to the power line 100, for example, measures the physical quantity related to the power line 100, and communicates information (hereinafter, referred to as “physical quantity data”) related to the measured physical quantity of the power line 100. It is configured to do. Specifically, the power line physical quantity measuring device 12 includes, for example, a main body unit 300, a power supply current transformer unit 420, a power supply unit 440, and a physical quantity measuring unit (current measuring current transformer unit 520, current measuring unit 540, and It has a temperature sensor unit 200), a communication unit 600, and a clamp 700.

(Clamp (grip part))
As shown in FIGS. 4, 6A, 6B, 6C and 7B, the clamp 700 is, for example, in the axial direction (Y direction) of the power line 100, outside the main body 300 described later, and in the axial direction of the power line 100. It is connected to one end of the main body portion 300 of the above. Further, the clamp 700 grips the power line 100 and fixes one end of the main body 300 to the power line 100.

Specifically, the clamp 700 has, for example, a lower clamp 720 and an upper clamp 740. The clamp lower portion 720 is connected to, for example, the lower half portion 360 of the main body portion 300, which will be described later, by welding, and is arranged vertically below the power line 100. Further, the clamp lower portion 720 has, for example, a recess (not shown by reference numeral) into which the power line 100 is fitted in the central portion on the vertically upper side. On the other hand, the clamp upper portion 740 is configured as a separate body that can be separated from the clamp lower portion 720, for example, and is arranged vertically above the power line 100. Further, the clamp upper portion 740 is configured symmetrically with the clamp lower portion 720, for example, and has a recess (not shown) in which the power line 100 is fitted in the central portion on the vertically lower side. The lower part of the clamp 720 and the upper part of the clamp 740 are arranged so as to face each other with the power line 100 interposed therebetween, and are screwed to each other with the power line 100 fitted in the respective recesses. As a result, the power line 100 can be gripped by the clamp 700, and one end of the main body 300 can be fixed to the power line 100.

The clamp 700 is made of, for example, the same metal as the metal constituting the stranded wire layer of the power line 100. Specifically, the clamp 700 is made of, for example, Al or an Al alloy. As a result, it is possible to suppress the occurrence of electrolytic corrosion due to the contact between the clamp 700 and the power line 100.

Further, since the clamp 700 grips the power line 100, the main body 300 described later is electrically connected to the power line 100 via the clamp 700. As a result, the clamp 700 and the main body 300 are equipotential with the power line 100.

(Main body)
As shown in FIGS. 4 to 7B, the main body 300 is configured to hold each member other than the temperature sensor 200 on the outside of the power line 100. The main body 300 is made of, for example, a metal that does not contain a magnetic material. Specifically, the main body 300 of the present embodiment is made of, for example, Al or an Al alloy. As a result, it is possible to prevent the magnetic field around the power line 100 from being shielded by the main body 300. Further, since the main body 300 is made of Al or an Al alloy, the weight of the main body 300 can be reduced.

As shown in FIGS. 6A to 7B, the main body 300 of the present embodiment has, for example, a double cylinder structure. Specifically, the main body 300 has, for example, an inner cylinder 320, an outer cylinder 340, and a lid portion 350. Power lines 100 are inserted into the inner cylinder 320 at intervals in the radial direction. The outer cylinder 340 is provided so as to surround the outer circumference of the inner cylinder 320, and forms an accommodating portion 330 as an accommodating space between the inner cylinder 320 and itself. The lid portion 350 connects the axial end portion of the inner cylinder 320 and the axial end portion of the outer cylinder 340, and closes the accommodating portion 330. In the accommodating unit 330, for example, a power supply CT unit 420, a power supply unit 440, a current measurement CT unit 520, a current measurement unit 540, and a communication unit 600 are housed. As described above, since the main body portion 300 has a double cylinder structure, it is possible to suppress the intrusion of rainwater into the accommodating portion 330.

As shown in FIG. 6C, in the present embodiment, the inner cylinder 320 is separated into at least two in the axial direction, for example. Specifically, the inner cylinder 320 has, for example, an annular insulating portion 322 that divides the inner cylinder 320 over the entire circumference of the inner cylinder 320 in a part in the axial direction. It should be noted that the inner cylinder 320 can be considered to be cut, for example, in a cross section that intersects (orthogonally) in the axial direction. Due to such a structure, one and the other in the axial direction of the inner cylinder 320 are separated from each other via an insulating portion 322. In the present embodiment, for example, an insulator is fitted in the insulating portion 322. The insulator fitted in the insulating portion 322 is, for example, an insulating resin or the like. By providing such an insulating portion 322, it is possible to suppress a decrease in power generation efficiency due to the power supply CT portion 420.

A filler (not shown) is filled in the gaps other than the power supply CT unit 420, the power supply unit 440, the current measurement CT unit 520, the current measurement unit 540, and the communication unit 600 in the accommodating unit 330. .. The filler is, for example, silicone rubber. Thereby, the waterproof property in the accommodating portion 330 can be improved.

Further, in the main body portion 300 of the present embodiment, at least the shape of the outer cylinder 340 is, for example, a cylindrical shape. That is, there are few protruding portions in the outer shape of the main body 300 which is equipotential with the power line 100. As a result, it is possible to suppress the occurrence of corona discharge due to the outer shape of the main body 300.

In the present embodiment, not only the shape of the outer cylinder 340 but also the shape of the inner cylinder 320 is, for example, a cylindrical shape. As a result, it is possible to prevent the formation of an unnecessary space between the inner cylinder 320 and the power line 100. As a result, the accommodating portion 330 between the inner cylinder 320 and the outer cylinder 340 can be widened while reducing the size of the main body portion 300.

Further, in the main body 300 of the present embodiment, for example, as described above, one end of the inner cylinder 320 in the axial direction of the power line 100 is fixed to the power line 100 via the clamp 700, and is electrically connected to the power line 100. It is connected to the. On the other hand, the other end of the inner cylinder 320 in the axial direction of the power line 100 is insulated from the power line 100 in a radial direction. As a result, it is possible to prevent both one end and the other end of the main body portion 300 in the axial direction of the power line 100 from being electrically connected to the power line 100. As a result, it is possible to suppress the formation of a detour for the current flowing through the power line 100.

Further, the main body 300 of the present embodiment is divided in half (divided into two) along the axial direction, for example. In addition, "divided in half along the axial direction" here means that it is divided into two by a plane including the axis or a plane parallel to the axis. The "plane" referred to here is not limited to one, and may be a combination of two or more planes. Further, the "plane parallel to the axis" here is not limited to a plane completely parallel to the axis, and may be a plane inclined with respect to the axis with a predetermined error. Hereinafter, the definition in the case where the other member is "divided in half along the axial direction" is the same as the above definition.

Specifically, the main body portion 300 has, for example, a lower half split portion 360, an upper half split portion 380, and a hinge portion 370. The lower half-split portion 360 is configured as one of the main body portions 300 divided in half along the axial direction, and is arranged on the vertically lower side. On the other hand, the upper half-split portion 380 is configured as the other of the main body portion 300 divided in half along the axial direction, and the lower half portion 380 is located on the opposite side (vertically upper side) from the lower half-split portion 360 with the power line 100 interposed therebetween. It is arranged so as to face the side half split portion 360. The hinge portion 370 is provided at the end of each of the lower half split portion 360 and the upper half split portion 380 in the circumferential direction, and connects the lower half split portion 360 and the upper half split portion 380 so as to be movable. Both ends of the lower half-split portion 360 in the circumferential direction and each of both ends of the upper half-split portion 380 in the circumferential direction are screwed to each other by, for example, bolts (not shown) and nuts (not shown). ing. With such a configuration, the main body 300 can be easily attached to the existing power line 100.

(Current transformer for power supply and power supply)
The power supply CT unit 420 and the power supply unit 440 of the present embodiment are configured in the same manner as those of the first embodiment described above, for example. The power supply CT unit 420 includes, for example, a power supply core 422 and a power supply coil 424.

Further, as shown in FIG. 8, the power supply core 422 of the present embodiment has, for example, a power line when _{the current value of the current I 1} flowing through the power line 100 is a predetermined current value equal to or less than the allowable current value of the power line 100. It is configured to be magnetically saturated with respect to the magnetic field generated around the power line 100 by the current flowing through the 100.

As shown in FIGS. 6C and 7B, the power supply CT section 420 is provided in an annular shape in, for example, the accommodating section 330 of the main body section 300 so as to surround the power line 100.

As shown in FIGS. 6C and 9, the power supply CT unit 420 of the present embodiment is divided in half along the axial direction, for example. Specifically, the power supply CT unit 420 includes, for example, a power supply lower portion 420d and a power supply upper portion 420u. The power supply lower portion 420d is configured as, for example, one of the power supply CT portions 420 divided in half along the axial direction, and is housed in the lower half division portion 360 of the main body portion 300. On the other hand, the power supply upper portion 420u is configured as, for example, the other side of the power supply CT portion 420 divided in half along the axial direction, and is housed in the upper half division portion 380 of the main body portion 300. The lower part 420d for power supply and the upper part 420u for power supply have the axes of the respective power supply cores 422 when the lower half part 360 and the upper half part 380 are closed (when they are connected so as to face each other). They are arranged so that they are matched and connected.

As shown in FIG. 9, the power supply coil 424 of the present embodiment is provided, for example, spirally wound only around the power supply upper portion 420u. Further, as shown in FIG. 6C, the power supply coil 424 and the power supply unit 440 are housed in, for example, the upper half portion 380 of the main body unit 300. The circuit board constituting the power supply unit 440 is provided in a semicircular shape, for example, following the shape of the upper half-split portion 380. Since the power supply coil 424 and the power supply unit 440 are housed in the upper half portion 380 in this way, the wiring for connecting the power supply coil 424 and the power supply unit 440 can be shortened.

Further, as shown in FIG. 9, the power supply core 422 of the present embodiment has, for example, a pair of half-split cores 423 that are split in half along the axial direction.

The power supply core 422 of the present embodiment is configured to have a substantially elliptical shape, for example. That is, each of the pair of half-split cores 423 of the power supply core 422 has, for example, a pair of end portions 423e, an arc portion 423r, and a straight portion 423l. Each of the pair of end portions 423e is fitted to, for example, the other of the pair of half-split cores 423 at each of the axial ends of the half-split core 423. The arc portion 423r is provided in an arc shape, for example, between the pair of end portions 423e so as to surround the outer circumference of the power line 100. The straight portion 423l extends linearly from the arc portion 423r toward the end portion 423e. Since the power supply core 422 has the linear portion 423l in this way, the pair of half-split cores 423 of the power supply core 422 can be stably coupled to each other. As described above, a predetermined gap may be provided between the pair of half-split cores 423 in order to obtain the magnetic saturation of the power supply core 422.

Further, as shown in FIGS. 6C and 7B, in the present embodiment, the power supply CT unit 420 is, for example, the communication unit 600, the power supply unit 440, and the power supply unit 440 described later (in the axial direction of the power line 100) of the main body unit 300. It is provided closer to the clamp 700 than the circuit board such as the current measuring unit 540. The power supply core 422 included in the power supply CT unit 420 is made of a magnetic material as described above, and is heavier than other members. Therefore, by bringing the power supply CT unit 420 closer to the clamp 700, the torque applied to the main body unit 300 due to the gravity of the power supply core 422 can be reduced.

(Physical quantity measurement unit)
The physical quantity measuring unit is configured to measure the physical quantity related to the power line 100 by, for example, the electric power supplied from the power supply unit 440. The physical quantity related to the power line 100 referred to here is, for example, the current I ₁ flowing through the power line 100, the temperature of the power line 100, the vibration of the power line 100, the slackness of the power line 100, and the like.

In the present embodiment, the power line physical quantity measuring device 12 is, for example, a current measuring CT unit 520 and a current measuring unit 540 for measuring the current _{I 1 flowing through the power line 100, and a temperature for measuring the temperature of the power line 100 as the physical quantity measuring unit.} It has a sensor unit 200 and.

(Current transformer for current measurement)
As shown in FIGS. 6C, 7B, and 10, the current measurement CT unit 520 of the present embodiment is configured in substantially the same manner as the power supply CT unit 420 described above, and is, for example, a current measurement core 522 and a current measurement. It has a coil 524 and a coil for 524. The current measurement core 522 is provided in an annular shape so as to surround the outer circumference of the power line 100. Further, the current measurement core 522 is made of a magnetic material. The magnetic material constituting the current measurement core 522 is, for example, ferrite. The current measurement coil 524 is spirally wound around at least a part of the current measurement core 522. With such a configuration, an induced voltage V is generated in the current measurement coil 524 by electromagnetic induction based on a change in the magnetic flux Φ generated in the current measurement core 522 around the power line 100 by the _{current I 1 flowing through the power line 100.} Can be done.

By measuring the induced voltage V generated in the current measuring coil 524, the current I ₁ flowing through the power line 100 can be obtained by the following equation (2).
I ₁ = NV / (KR) ・ ・ ・ (2)
However, N is the number of turns of the current measurement coil 524, R is the resistance value (Ω) of the terminating resistor described later, and K is the coupling coefficient.

_{In the present embodiment, even when the current I 1} flowing through the power line 100 fluctuates, the change in the magnetic flux Φ generated in the current measurement core 522 is changed so that the current value of the _{current I 1 can be measured accurately.} , It follows the fluctuation of the current I _{1 well.}

Specifically, as shown in FIG. 8, the current measurement core 522 of the present embodiment has, for example, the power line 100 as long as _{the current value of the current I 1} flowing through the power line 100 is equal to or less than the allowable current value of the power line 100. It is configured so as not to be magnetically saturated with respect to the magnetic field generated around the power line 100 by the _{current I 1} flowing through the power line 100. As a result, the measurement accuracy of the _{current I 1} flowing through the power line 100 can be improved.

In current measurement core 522 of the present embodiment, for example, a magnetic saturation point SP2 is located higher than the maximum magnetic field strength H _p. That is, if _{the current value of the current I 1} flowing through the power line 100 is equal to or less than the allowable current value of the power line 100, the current measurement core 522 is not magnetically saturated, and the magnetic flux density B generated in the current measurement core 522 is the monotonically increasing region MR2. Be inside. This makes it possible throughout the operation range for the peak value of the current I _1, changes the induced voltage V linearly with respect to the current I _1. As a result, the measurement accuracy of the _{current I 1 can be improved.}

Although FIG. 8 shows a case where the slope of the monotonous increase region MR1 of the power supply core 422 and the slope of the monotonous increase region MR2 of the current measurement core 522 match, the monotonous increase of the power supply core 422 is shown. The slope of the region MR1 may be different from the slope of the monotonically increasing region MR2 of the current measurement core 522.

Further, as shown in FIG. 10, the current measurement CT unit 520 of the present embodiment is divided in half along the axial direction, for example, like the power supply CT unit 420. Specifically, the current measurement CT unit 520 has, for example, a current measurement lower portion 520d and a current measurement upper portion 520u.

Further, as shown in FIG. 10, the current measurement coil 524 of the present embodiment is spirally wound over both the current measurement lower portion 520d and the current measurement upper portion 520u, for example.

Further, as shown in FIG. 10, the current measuring core 522 of the present embodiment has, for example, a pair of half-divided cores 523 divided in half along the axial direction.

The current measurement core 522 of the present embodiment is configured to have a substantially elliptical shape, like the power supply core 422, for example. That is, each of the pair of half-split cores 523 of the current measurement core 522 has, for example, a pair of end portions 523e, an arc portion 523r, and a straight portion 523l. The straight portion 523l extends linearly from the arc portion 523r toward the end portion 523e. As a result, the pair of half-split cores 523 of the current measurement cores 522 can be stably coupled to each other.

Further, in the present embodiment, the heavier of the power supply CT unit 420 and the current measurement CT unit 520 is provided on the side of the main body 300 (in the axial direction of the power line 100) closer to the clamp 700 than the other. ing. In the present embodiment, since the current measurement CT unit 520 is heavier than, for example, the power supply CT unit 420, it is provided on the side of the main body 300 closer to the clamp 700 than the power supply CT unit 420 (FIG. 6C). And FIG. 7B). As a result, even when two CT portions are provided, the torque applied to the main body portion 300 due to the gravity of the two cores can be reduced.

The power supply CT unit 420 and the current measurement CT unit 520 are preferably arranged adjacent to each other, for example. That is, it is preferable that there is no unnecessary gap between the power supply CT unit 420 and the current measurement CT unit 520 other than each coil. As a result, the torque applied to the main body 300 can be reliably reduced.

(Current measurement unit (current measurement circuit board))
As shown in FIG. 5, the current measuring unit 540 has, for example, a terminating resistor (not shown) connected to the current measuring CT unit 520, and the current measuring CT unit 520 has the current measuring CT unit 520 according to the above equation (2). It is configured to measure the _{current I 1} flowing through the power line 100 based on the output induced voltage V. _{Hereinafter, the information related to the current I 1} of the power line 100 measured by the current measuring unit 540 is referred to as “current data”.

As shown in FIGS. 6C and 7B, the current measuring unit 540 is housed in the lower half portion 360 of the main body unit 300 together with the communication unit 600 described later, for example.

(Temperature sensor)
As shown in FIG. 4, the temperature sensor unit 200 is configured to be in contact with the power line 100 and measure the temperature of the power line 100, for example. Specifically, the temperature sensor unit 200 has, for example, a thermocouple that outputs a voltage corresponding to the temperature.

The temperature sensor unit 200 is connected to the communication unit 600 in the main body unit 300 via, for example, a lead wire 280. The temperature sensor unit 200 and the lead wire 280 are fixed to the power line 100 along the power line 100 by, for example, a binding band (not shown).

In the present embodiment, the temperature sensor unit 200 is provided, for example, on the side opposite to the clamp 700 with the main body unit 300 in the axial direction (Y direction) of the power line 100. As a result, the temperature sensor unit 200 can be separated from the clamp 700 by at least the length of the main body unit 300. As a result, the temperature of the power line 100 can be measured with high accuracy.

(Communication section (transmission / reception section))
The communication unit 600 is configured to communicate, for example, predetermined information. In the present embodiment, the communication unit 600 is configured to wirelessly transmit information related to the physical quantity of the power line 100 measured by the physical quantity measuring unit, for example.

Specifically, as shown in FIG. 5, the communication unit 600 is connected to the current measurement CT unit 520 via, for example, the current measurement unit 540, and is based on the induced voltage V output by the current measurement CT unit 520. It is configured to acquire the current data of the power line 100 measured in the above. Further, the communication unit 600 is connected to, for example, the temperature sensor unit 200, and is configured to acquire the temperature data of the power line 100 measured by the temperature sensor unit 200. Further, the communication unit 600 is connected to the power supply CT unit 420 via, for example, the power supply unit 440, and wirelessly transmits various data such as temperature data and current data to the outside by the electric power supplied from the power supply unit 440. It is configured as.

In the present embodiment, the communication unit 600 has, for example, an MCU (Micro Controller Unit) (not shown). The MCU included in the communication unit 600 includes, for example, a processor that executes a predetermined program related to transmission / reception of various data, a memory that stores the program and various data, one or more timers that serve as a reference for a transmission cycle, and the above-mentioned. It has an I / O port connected to each member. Each part constituting the MCU is incorporated in one integrated circuit. In addition to the memory of the MCU, the communication unit 600 may have an external memory such as a ROM (Flash Read-Only Memory).

Further, as shown in FIGS. 4 and 5, the communication unit 600 has, for example, an antenna 620, and is configured to transmit and receive various data via the antenna 620. The frequency band for transmission and reception by the communication unit 600 is, for example, a 920 MHz band. Here, in the past, for example, the 2.4 GHz band was often used as the frequency band for transmission and reception by the communication unit. On the other hand, in the present embodiment, by using the 920 MHz band, for example, the transmission distance (depending on the length of the antenna 620) can be increased by about 2.6 times as compared with the conventional one. Further, by using the 920 MHz band, it is possible to improve the diffractivity of radio waves with respect to obstacles.

Further, in the present embodiment, the communication unit 600 is configured to transmit various data by, for example, so-called multi-hop wireless communication (bucket relay method). Specifically, for example, in a power transmission equipment monitoring system (power transmission system) having a plurality of power line physical quantity measuring devices 12, the plurality of power line physical quantity measuring devices 12 are predetermined along the axial direction of the power line 100 (in the Y direction). They are arranged at intervals. Among the plurality of power line physical quantity measuring devices 12, the communication unit 600 of the predetermined power line physical quantity measuring device 12 first receives, for example, various data from the adjacent front stage side (upstream side) power line physical quantity measuring devices 12. When the communication unit 600 of the predetermined power line physical quantity measuring device 12 receives various data from the power line physical quantity measuring device 12 on the front stage side, the various data of the power line physical quantity measuring device 12 on the front stage side and its own various data are aggregated. .. After collecting various data in the communication unit 600 of the predetermined power line physical quantity measuring device 12, the power line on the rear stage side (downstream side) adjacent to the power line physical quantity measuring device 12 on the front stage side across the predetermined power line physical quantity measuring device 12. Various aggregated data are transmitted to the physical quantity measuring device 12. Such aggregation and transmission of various data are sequentially repeated in each of the plurality of power line physical quantity measuring devices 12. When the various aggregated data are transmitted to the last-stage power line physical quantity measuring device 12, the last-stage power line physical quantity measuring device 12 transmits, for example, various aggregated data to a data-aggregated transmission device (not shown). The data aggregation transmission device transmits various aggregated data wirelessly or by wire to, for example, an electric power company as a power supply source for supplying electric power to the power line 100. The electric power company controls the transmission capacity to the power line 100 based on various data. By transmitting various data by multi-hop wireless communication in this way, the transmission distance of the plurality of power line physical quantity measuring devices 12 as a whole can be reduced while reducing the power required for the communication unit 600 of each power line physical quantity measuring device 12. Can be lengthened.

Further, in the present embodiment, the communication unit 600 repeatedly transmits, for example, various data at a predetermined cycle. The cycle in which the communication unit 600 transmits various data is, for example, 3 minutes. As a result, the electric power company that supplies electric power to the power line 100 can grasp the temperature of the power line 100 and the current of the power line 100 in real time based on various data transmitted from the power line physical quantity measuring device 12. By grasping the temperature of the power line 100 and the current of the power line 100 in real time, it is possible to control the transmission capacity to the power line 100 based on the temperature of the power line 100 and the current of the power line 100 in real time. As a result, efficient power transmission to the power line 100 can be realized.

Further, as shown in FIGS. 6C and 7B, the communication unit 600 is mounted on the same circuit board together with the current measurement unit 540 described above, and is housed in the lower half portion 360 of the main body 300. .. The circuit board constituting the current measuring unit 540 and the communication unit 600 is provided in a semicircular shape, for example, following the shape of the lower half split portion 360.

Further, as shown in FIGS. 4, 6B, 6C and 7A, the antenna 620 of the communication unit 600 is provided, for example, so as to project outward from the lower half portion 360 of the main body 300. In this way, the communication unit 600 and the antenna 620 are provided on the lower half division 360, that is, vertically below the main body 300, so that the reception target on the ground (for example, a reader possessed by a worker on the ground) is provided. Etc.), various data can be stably transmitted.

Further, as shown in FIG. 7A, the communication unit 600 has, for example, a pair of antennas 620. Each of the pair of antennas 620 is inclined with respect to the vertical direction, for example. The pair of antennas 620 are provided symmetrically (in a C shape) with the center of the main body 300 in between, for example, when viewed from the axial direction of the main body 300. As a result, the correlation between the pair of antennas 620 can be reduced, and the antenna 620 with the better radio wave condition can selectively transmit and receive. That is, the diversity effect of the communication unit 600 can be improved.

(2) Effects of the present embodiment According to the present embodiment, one or more of the following effects are exhibited.

(A) The power supply device 10 can be applied as a power line physical quantity measuring device 12. _{In this case, when the current value of the current I 1} flowing through the power line 100 is a predetermined current value equal to or less than the allowable current value of the power line 100, the power supply core 422 is magnetically saturated, so that the physical quantity measuring unit as a load or the physical quantity measuring unit It is possible to suppress the generation of excessive power that is not necessary for the communication unit 600 and the like. As a result, it is possible to prevent excessive heat generation in each part of the power line physical quantity measuring device 12. As a result, the power supply from the power supply CT unit 420 can be stably maintained, and the power line physical quantity measuring device 12 can be operated semi-permanently.

(B) The inner cylinder 320 of the main body 300 interposed between the power line 100 and the power supply CT unit 420 is separated into at least two in the axial direction. As a result, it is possible to prevent the metal main body 300 from forming a metal one-turn loop (separate from the power coil 424) around the power core 422 of the power supply CT unit 420. .. As a result, it is possible to suppress a decrease in power generation efficiency due to the power supply CT unit 420.

(C) The power supply coil 424 and the power supply unit 440 are housed in the upper half portion 380 of the main body unit 300. As a result, the wiring for connecting the power supply coil 424 and the power supply unit 440 can be shortened. Specifically, it is possible to eliminate the need to connect the power supply coil 424 between the upper half-split portion 380 and the lower half-split portion 360. Further, it is possible to prevent the wiring connecting the power supply coil 424 and the power supply unit 440 from straddling between the upper half-split portion 380 and the lower half-split portion 360. As a result, the structure of the power line physical quantity measuring device 12 can be simplified.

(D) Each of the pair of half-split cores 423 of the power supply core 422 has a straight portion 423 l extending linearly toward the end portion 423e. When the pair of half-split cores 423 of the power supply core 422 face each other, the two straight portions 423l are aligned in parallel, so that each of the pair of half-split cores 423 of the power supply core 422 is aligned. It is possible to suppress the misalignment of the central axis. As a result, the pair of half-split cores 423 of the power supply cores 422 can be stably coupled to each other.

Since the current measurement core 522 also has a linear portion 523 liter like the power supply core 422, the same effect as the power supply core 422 can be obtained.

(E) As described above, the power supply core 422 has the current I flowing through the power line 100.₁When the current value of is a predetermined current value equal to or less than the allowable current value of the power line 100, magnetic saturation is performed with respect to the magnetic field generated by the current flowing through the power line 100 as described above. On the other hand, the current measurement core 522 has a current I flowing through the power line 100.₁In the range where the current value of is equal to or less than the allowable current value of the power line 100, the current I flowing through the power line 100₁It is configured not to be magnetically saturated with respect to the magnetic field generated by. As a result, the current I₁Current I over the entire range of variation for the peak value of₁The induced voltage V can be changed linearly with respect to. As a result, the current I ₁It is possible to improve the measurement accuracy of.

<Third Embodiment of the present disclosure>
(1) Communication device The power supply device 10 in the first embodiment described above can be applied as, for example, a communication device 14. It may be considered that the power supply device 10 of the first embodiment described above is incorporated in the communication device 14.

Hereinafter, the communication device 14 according to the present embodiment will be described with reference to FIG. FIG. 11 is a block diagram showing a communication device according to the present embodiment.

The communication device 14 of the present embodiment is mounted on the power line 100, for example, and is configured to relay predetermined information by multi-hop wireless communication. Specifically, the communication device 14 includes, for example, a main body unit 300, a power supply current transformer unit 420, a power supply unit 440, a communication unit 600, and a clamp 700. The communication unit 600 is configured to wirelessly transmit and receive predetermined information by, for example, the electric power supplied from the power supply unit 440.

That is, the communication device 14 can be configured in the same manner as the power line physical quantity measuring device 12 of the second embodiment described above, except that the communication device 14 does not have a physical quantity measuring unit.

(2) Effects of the present embodiment According to the present embodiment, one or more of the following effects are exhibited.

(A) The power supply device 10 can be applied as a communication device 14. _{In this case, when the current value of the current I 1} flowing through the power line 100 is a predetermined current value equal to or less than the allowable current value of the power line 100, the power supply core 422 is magnetically saturated, so that the communication unit 600 as a load It is possible to suppress the generation of unnecessary excess power. As a result, it is possible to prevent excessive heat generation from occurring in each part of the communication device 14. As a result, the power supply from the power supply CT unit 420 can be stably maintained, and the communication device 14 can be operated semi-permanently.

(B) The communication device 14 of the present embodiment is configured to relay predetermined information by multi-hop wireless communication. As a result, the communication device 14 can be applied to the above-mentioned power transmission equipment monitoring system. Specifically, it is not necessary to measure the physical quantity of the power line 100, and by simply using the communication device 14 in a place where the radio wave condition becomes poor, it is possible to relay the transmission of various data.

<Fourth Embodiment of the present disclosure>
In the first to third embodiments described above, the case where the power line 100 to which the power supply device 10 is attached is configured as an overhead power transmission line has been described, but the present disclosure is not limited to this case. As in the fourth embodiment below, the power line 100 to which the power supply device 10 is attached may be configured as, for example, a power cable (insulation coated cable).

(1) Power Line Physical Quantity Measuring Device The power supply device 10 in the first embodiment described above measures a physical quantity related to a power line 100 while acquiring power by using, for example, electromagnetic induction from the power line 100 as a power cable. It can be applied as a power line physical quantity measuring device 16. It may be considered that the power supply device 10 and the communication device 14 are incorporated in the power line physical quantity measuring device 16.

Hereinafter, the power line physical quantity measuring device 16 according to the present embodiment will be described with reference to FIG. FIG. 12 is a schematic configuration diagram showing a power line physical quantity measuring device according to the present embodiment. In FIG. 12, the power line 100 is shown in a cross-sectional view.

As shown in FIG. 12, the power line physical quantity measuring device 16 of the present embodiment includes, for example, a power supply current transformer unit 420, a power supply unit 440, and a physical quantity measuring unit (current measuring current transformer unit 520, current measuring unit 540). And a communication current transformer unit 660 and a communication unit 640.

(Power line)
As shown in FIG. 12, the power line 100 of the present embodiment is configured as, for example, a so-called solid-state insulated cable (CV cable: Cross-linked Polyethylene insulated Polyvinyl chloride sheath cable, or XLPE cable). Specifically, the power line 100 shields the conductor 110, the inner semi-conductive layer (not shown), the insulating layer 130, the outer semi-conductive layer (not shown) from the center side to the outer peripheral side, for example. It has a layer (metal shielding layer, metal sheath) 150 and a sheath (insulating sheath) 160.

The pair of power lines 100 are, for example, gradually peeled off in the axial direction and connected to each other in the junction box 800 so that the central axes of the conductors 110 are aligned with each other.

FIG. 12 shows, as an example, a normal connection portion (NJ1 or NJ2) described later. In the junction box 800 of the normal connection portion, the shielding layers 150 of the pair of power lines 100 are connected to each other. Further, a conductive wire 152 is connected to the shielding layer 150 of the pair of power lines 100. The conductive wire 152 is led out to the outside of the junction box 800. The drawn conductive wire 152 is connected to the conductive wire 152 connected to the shielding layer 150 in the other junction box 800 of the normal connection portion, and is grounded.

(CT section for power supply)
The power supply CT unit 420 includes, for example, a power supply core 422 and a power supply coil 424. The power supply core 422 is provided in an annular shape so as to surround the outer circumference of the power line 100 (the outer circumference of the sheath 160). Further, the power supply coil 424 is spirally wound around at least a part of the power supply core 422. With such a configuration, an induced current is generated in the power supply coil 424 by electromagnetic induction based on the change in the magnetic flux generated in the power supply core 422 around the power line 100 by the conductor current (main current) flowing through the conductor 110 of the power line 100. Can be made to.

Further, in the power supply core 422 of the present embodiment, for example, when the current value of the conductor current flowing through the conductor 110 of the power line 100 is a predetermined current value equal to or less than the allowable current value of the power line 100, the conductor current flowing through the power line 100 It is configured to be magnetically saturated with respect to the magnetic field generated around the power line 100. In other words, the magnetic saturation point in the magnetization curve shown by the power supply core 422 is located below, for example, the maximum value of the magnetic field strength generated around the power line 100 when the current value of the conductor current of the power line 100 is the allowable current value. doing. Since the power supply core 422 exhibits magnetic saturation in this way, it is possible to suppress the generation of excessive electric power.

(Power supply part)
The power supply unit 440 is connected to, for example, the power supply CT unit 420, and is configured to supply electric power to the physical quantity measuring unit and the communication unit 640 based on the induced current generated by the power supply CT unit 420. ..

(Physical quantity measurement unit)
In the present embodiment, the power line physical quantity measuring device 16 has, for example, a current measuring CT unit 520 and a current measuring unit 540 as physical quantity measuring units.

(Current transformer for current measurement)
The current measurement CT unit 520 of the present embodiment includes, for example, a current measurement core 522 and a current measurement coil 524. The current measurement core 522 is provided in an annular shape so as to surround the outer circumference of the power line 100. The current measurement coil 524 is spirally wound around at least a part of the current measurement core 522.

In the present embodiment, as in the second embodiment described above, the current measurement CT unit 520 is attached to the power line 100, so that the current (conductor current) flowing through the power line 100 is used for current measurement around the power line 100. An induced voltage can be generated in the current measuring coil 524 by electromagnetic induction based on the change in the magnetic flux generated in the core 522. By measuring the induced voltage generated in the current measuring coil 524, the current flowing through the power line 100 can be obtained.

In the present embodiment, the current measurement core 522 of the present embodiment is placed around the power line 100 by the current flowing through the power line 100, for example, in the range where the current value of the current flowing through the power line 100 is equal to or less than the allowable current value of the power line 100. It is configured so that it does not magnetically saturate with respect to the generated magnetic field. Thereby, the measurement accuracy of the current flowing through the power line 100 can be improved.

(Current measuring unit)
The current measuring unit 540 is connected to, for example, the current measuring CT unit 520, and is configured to measure the current flowing through the power line 100 based on the induced voltage output by the current measuring CT unit 520. Hereinafter, the information related to the current of the power line 100 measured by the current measuring unit 540 is referred to as "current data" as in the second embodiment described above.

(Communication section and current transformer section for communication)
The power line physical quantity measuring device 16 of the present embodiment is configured to communicate predetermined information via the shielding layer 150 by inductively coupling with the shielding layer 150 of the power line 100, for example. That is, the communication by the power line physical quantity measuring device 16 is so-called power line carrier communication (PLC).

The communication unit 640 is configured to communicate information related to the physical quantity of the power line 100 measured by the physical quantity measuring unit, for example.

Specifically, the communication unit 640 is connected to the current measurement CT unit 520 via, for example, the current measurement unit 540, and acquires current data measured based on the induced voltage output by the current measurement CT unit 520. It is configured to do. Further, the communication unit 640 is connected to the power supply CT unit 420 via, for example, the power supply unit 440, and is configured to communicate physical quantity data such as current data by the electric power supplied from the power supply unit 440.

The communication CT unit 660 is attached to, for example, a conductive wire 152 connected to the shielding layer 150. The communication CT unit 660 is inductively coupled to the shielding layer 150 via, for example, the conductive wire 152. As a result, the communication unit 640 can communicate predetermined information with another communication device or another power line physical quantity measuring device via the shielding layer 150 by the communication CT unit 660.

The communication CT unit 660 has, for example, a communication core 662 and a communication coil 664. The communication core 662 is provided in an annular shape so as to surround the conductive wire 152 connected to the shielding layer 150, for example. The communication coil 664 is spirally wound around at least a part of the communication core 662, for example.

In the present embodiment, for example, the communication unit 640 transmits predetermined information to another communication device or another power line physical quantity measuring device via the shielding layer 150 by the communication CT unit 660, and the communication CT unit 660 transmits predetermined information. It is configured to receive predetermined information from another communication device or another power line physical quantity measuring device via the shielding layer 150. The operations of the communication CT unit 660 and the communication unit 640 are different depending on whether the communication unit 640 transmits information or the communication unit 640 receives information.

When the communication unit 640 transmits information, the communication unit 640 passes a predetermined transmission current through the communication coil 664, for example, and causes the communication core 662 to change the magnetic flux due to the transmission current. As a result, the signal current related to the predetermined information is used as an induced current to be generated in the conductive wire 152 by electromagnetic induction. As a result, the communication unit 640 can transmit the signal current related to the predetermined information to another communication device or another power line physical quantity measuring device via the shielding layer 150.

In the present embodiment, the change in the magnetic flux generated in the communication core 662 satisfactorily follows the fluctuation of the transmission current so that the signal current related to the predetermined information can be accurately generated from the transmission current. ..

Specifically, the communication core 662 is magnetic with respect to the magnetic field generated by the transmission current flowing through the communication coil 664, for example, within the range in which the current value of the transmission current is necessary for performing communication related to the predetermined information. It is configured so that it does not saturate. Since the communication core 662 exhibits magnetic desaturation in transmission in this way, a signal current can be accurately generated from the transmission current.

On the other hand, when the communication unit 640 receives the information, the magnetic flux changes in the communication core 662 due to the signal current transmitted from the other communication device or the other power line physical quantity measuring device and flowing through the conductive line 152. The communication coil 664 generates a received current as an induced current by electromagnetic induction based on the change in the magnetic flux generated in the communication core 662 by the above-mentioned signal current. The communication unit 640 can acquire predetermined information by demodulating the received current generated by the communication coil 664.

In the present embodiment, the change in the magnetic flux generated in the communication core 662 satisfactorily follows the fluctuation of the signal current so that the received current related to the predetermined information can be accurately generated from the signal current. ..

Specifically, the communication core 662 is magnetically saturated with respect to the magnetic field generated by the signal current flowing through the conductive wire 152, for example, within the range in which the current value of the signal current is necessary for performing communication related to the predetermined information. It is configured not to. Since the communication core 662 exhibits magnetic non-saturation in reception in this way, the reception current can be accurately generated from the signal current.

When the communication CT unit 660 and the communication unit 640 both transmit and receive the predetermined information as in the present embodiment, the communication core 662 has, for example, the magnetic unsaturated property in the above-mentioned transmission. , And the above-mentioned magnetic unsaturated property in reception, may be configured to show both.

(2) Communication system (sensor network system)
The power line physical quantity measuring device 16 of the present embodiment can be applied to, for example, the communication system 20 used in the power system.

Hereinafter, the communication system 20 according to the present embodiment will be described with reference to FIG. FIG. 13 is a schematic configuration diagram showing a communication system according to the present embodiment. Note that FIG. 13 shows only the shielding layer 150 of the power lines 100.

(Power system)
As shown in FIG. 13, the power system of the present embodiment is composed of, for example, a three-phase three-wire system. The three power lines 100 of the power system are referred to as power lines a, b and c. At least part of the power system is laid underground, for example.

In the power system of the present embodiment, for example, the shielding layers 150 of the three power lines a to c are so-called cross-bonded. That is, the power system has, for example, a normal connection portion NJ1, an insulated connection portion IJ1, an insulated connection portion IJ2, and a normal connection portion NJ2 at predetermined intervals in the laying direction of the power line 100 in this order.

In the junction box 800 of each of the normal connection portion NJ1, the insulated connection portion IJ1, the insulated connection portion IJ2, and the normal connection portion NJ2, the pair of power lines 100 are connected to each other with the central axes of the conductors 110 aligned with each other.

In FIG. 13, the power lines 100 connected as the power lines a are referred to as power lines a1 to a5, the power lines 100 connected as power lines b are referred to as power lines b1 to b5, and the power lines 100 connected as power lines c are referred to as power lines c1 to c5. And.

In each of the ordinary connecting portions NJ1 and NJ2, the shielding layers 150 are connected to each other in a pair of power lines 100 in which the conductors 110 are connected to each other. Further, the shielding layers 150 of the power lines a to c are connected to each other and grounded via the conductive wires 152.

On the other hand, in the insulated connection portions IJ1 and IJ2, in the pair of power lines 100 in which the conductors 110 are connected to each other, one shielding layer 150 and the other shielding layer 150 are different power lines 100 of other phases. It is connected to the shielding layer 150 of the above via a conductive wire 154. Specifically, for example, the shielding layer 150 of the power line a2 is connected to the shielding layer 150 of the power line b3 via the conductive wire 154. On the other hand, for example, the shielding layer 150 of the power line a3 is connected to the shielding layer 150 of the power line c2 via the conductive wire 154.

A series of sections composed of the normal connection part NJ1, the insulated connection part IJ1, the insulated connection part IJ2, and the normal connection part NJ2 are referred to as "cross-bond section CB". In the cross-bond section CB, as described above, by connecting the shielding layers 150 of the power lines a to c in series, three sheath currents having different phases (induced currents flowing through the shielding layer 150) are synthesized and canceled. Can be done.

The above-mentioned cross-bond section CB is repeatedly provided, for example, in the laying direction of the power line 100.

(Communications system)
The communication system 20 of the present embodiment is used, for example, in a power system in which the shielding layers 150 of the power lines a to c described above are cross-bonded.

The communication system 20 includes, for example, a plurality of power line physical quantity measuring devices 16. Each of the plurality of power line physical quantity measuring devices 16 is configured to be able to communicate information related to the physical quantity of the power line 100 via the shielding layer 150 by inductively coupling with the shielding layer 150, for example.

Specifically, referring to FIG. 12, each of the plurality of power line physical quantity measuring devices 16 has, for example, a power supply CT unit 420, a power supply unit 440, and a physical quantity measuring unit (current measurement CT), as described above. It has a unit 520, a current measurement unit 540), a communication CT unit 660, and a communication unit 640. The power supply core 422 included in the power supply CT unit 420 exhibits the above-mentioned magnetic saturation. The current measurement core 522 of the current measurement CT unit 520 and the communication core 662 of the communication CT unit 660 each exhibit the above-mentioned magnetic unsaturated properties.

In the present embodiment, for example, two power line physical quantity measuring devices 16 are provided in one cross-bond section CB. The power line physical quantity measuring device 16a, which is one of the two power line physical quantity measuring devices 16, is arranged in, for example, the normal connection portion NJ1, and the power line physical quantity measuring device 16b, which is the other, is arranged in the normal connection portion NJ2, for example. There is.

In the power line physical quantity measuring device 16a arranged in the ordinary connection unit NJ1, the power supply CT unit 420 and the current measurement CT unit 520 are attached to, for example, the power line c1. The communication CT unit 660 is attached to, for example, a conductive wire 152 that connects the shielding layer 150 of the power line c1 and the shielding layer 150 of the power line c2.

In the power line physical quantity measuring device 16b arranged in the ordinary connection portion NJ2, the power supply CT unit 420 and the current measurement CT unit 520 are attached to, for example, the power line c4. The communication CT unit 660 is attached to, for example, a conductive wire 152 that connects the shielding layer 150 of the power line c4 and the shielding layer 150 of the power line c5.

For example, in each cross-bond section (not shown), two power line physical quantity measuring devices are provided as described above.

Communication by the two power line physical quantity measuring devices 16 in the present embodiment is performed, for example, as follows.

In the power line physical quantity measuring device 16a of the transmission source arranged in the normal connection unit NJ1, when the communication unit 640 acquires the physical quantity data such as the current data, the communication unit 640 uses the communication CT unit 660 to display the signal current related to the physical quantity data. Is transmitted to the power line physical quantity measuring device 16b via the shielding layer 150.

At this time, unique IDs (Identification) are assigned to the two power line physical quantity measuring devices 16. The communication unit 640 of the power line physical quantity measuring device 16a of the transmission source transmits the signal current related to the ID information of the power line physical quantity measuring device 16b of the transmission destination to the power line physical quantity measuring device 16b together with the signal current related to the physical quantity data described above.

At this time, the communication unit 640 of the power line physical quantity measuring device 16a modulates the transmission current according to, for example, orthogonal frequency division multiplexing (OFDM: Orthogonal Frequency Division Multiplexing), so that the communication CT unit 660 modifies a predetermined signal current. To generate. As a result, the signal current can be satisfactorily transmitted even when the signal-to-noise ratio is close to 0 dB.

The signal current transmitted by the communication unit 640 of the power line physical quantity measuring device 16a by the communication CT unit 660 is, for example, from the conductive wire 152, the shielding layer 150 of the power line c2, the conductive wire 154, the shielding layer 150 of the power line a3, and the conductive wire 154. , And through the shielding layer 150 of the power line b4, flows to the conductive line 152 to which the communication CT unit 660 of the power line physical quantity measuring device 16a is attached.

In the power line physical quantity measuring device 16b of the transmission destination arranged in the normal connection unit NJ2, the signal current flowing through the conductive line 152 causes the communication coil 664 of the communication CT unit 660 to generate a received current as an induced current. The communication unit 640 demodulates the received current generated by the communication coil 664. The communication unit 640 confirms the ID information included in the information obtained by demodulating the received current. When the ID information is confirmed, if the ID information indicates the power line physical quantity measuring device 16b, the communication unit 640 acquires predetermined information from the received current.

As described above, the communication from the power line physical quantity measuring device 16a arranged in the normal connection portion NJ1 to the power line physical quantity measuring device 16b arranged in the normal connection portion NJ2 is completed.

In the communication system 20 of the present embodiment, communication other than the communication from the power line physical quantity measuring device 16a to the power line physical quantity measuring device 16b can be performed in the same manner as described above except that the communication path is different.

Specifically, for example, communication can be performed from the power line physical quantity measuring device 16b to the power line physical quantity measuring device 16a. As a result, the communication related to the predetermined information can be reciprocated within the cross-bond section CB.

Alternatively, for example, communication can be performed from the power line physical quantity measuring device 16b toward the power line physical quantity measuring device or the communication device in the adjacent cross-bond section. As a result, multi-hop communication can be performed via the shielding layer 150 over the plurality of cross-bond sections.

(3) Effects of the present embodiment According to the present embodiment, one or more of the following effects are exhibited.

(A) The power supply device 10 can be applied as a power line physical quantity measuring device 16 that measures a physical quantity related to the power line 100 while acquiring electric power by using electromagnetic induction from the power line 100 as a power cable. In this case, when the current value of the conductor current flowing through the conductor 110 of the power line 100 is a predetermined current value equal to or less than the allowable current value of the power line 100, the power supply core 422 is magnetically saturated to measure the physical quantity as a load. It is possible to suppress the generation of excessive power that is unnecessary for the unit, the communication unit 640, and the like. As a result, it is possible to suppress excessive heat generation in each part of the power line physical quantity measuring device 16. As a result, the power supply from the power supply CT unit 420 can be stably maintained, and the power line physical quantity measuring device 16 can be operated semi-permanently.

For example, when the power line 100 is laid in an underground cave, it is difficult for the worker who manages the communication system 20 to frequently check the operating status of the power line physical quantity measuring device 16. In the present embodiment, by stably operating the power line physical quantity measuring device 16, the confirmation work by the worker who manages the communication system 20 can be reduced, and maintenance can be easily performed.

(B) The power line physical quantity measuring device 16 is configured to communicate predetermined information via the shielding layer 150 by inductively coupling with the shielding layer 150 of the power line 100. As a result, for example, even if the power line 100 is laid in an environment where wireless communication is difficult, good communication can be performed via the shielding layer 150.

(C) When the communication unit 640 transmits information, the communication core 662 has a transmission current flowing through the communication coil 664 within a range in which the current value of the transmission current is necessary for performing communication related to the predetermined information. It is configured so that it does not magnetically saturate with respect to the magnetic field generated by. As a result, even if the transmission current fluctuates within a predetermined required range, the signal current can be changed linearly with respect to the transmission current. As a result, the signal current can be accurately generated from the transmission current.

(D) When the communication unit 640 receives the information, the communication core 662 receives the signal current flowing through the conductive wire 152 within the range in which the current value of the signal current is necessary for performing the communication related to the predetermined information. It is configured so that it does not magnetically saturate with respect to the generated magnetic field. As a result, even if the signal current fluctuates within a predetermined required range, the received current can be changed linearly with respect to the signal current. As a result, the received current can be accurately generated from the signal current.

<Other Embodiments of the present disclosure>
Although the embodiments of the present disclosure have been specifically described above, the present disclosure is not limited to the above-described embodiments, and various changes can be made without departing from the gist thereof.

In the second to fourth embodiments described above, the case where the power supply device 10 is applied as the power line physical quantity measuring device 12 or the communication device 14 has been described. However, if the power supply device 10 is a device that obtains power from the power line 100, the power line is used. It may be a device other than the physical quantity measuring device 12 and the communication device 14.

In the second embodiment described above, the power line physical quantity measuring device 12 measures, for example, the temperature of the current measuring CT unit 520 and the current measuring unit 540 for measuring the current _{I 1 flowing through the power line 100, and the temperature of the power line 100 as the physical quantity measuring unit.} Although the case where the temperature sensor unit 200 for measuring is provided has been described, the present disclosure is not limited to this case. The power line physical quantity measuring device 12 may not have, for example, one of the current measuring CT unit 520, the current measuring unit 540, and the temperature sensor unit 200. Alternatively, the power line physical quantity measuring device 12 may have other physical quantity measuring units other than the current measuring CT unit 520, the current measuring unit 540, and the temperature sensor unit 200. Examples of other physical quantity measuring devices include a vibration sensor, GPS (Global Positioning System), and the like. The vibration sensor can measure the vibration of the power line 100. Further, the vibration of the power line 100, the slackness of the power line 100, and the like can be measured by GPS.

In the second embodiment described above, the case where the temperature sensor unit 200 has a thermocouple has been described, but the present disclosure is not limited to this case. For example, the temperature sensor unit 200 may have a thermistor whose resistance changes according to the temperature.

In the second embodiment described above, the case where the clamp 700 is divided into upper and lower parts has been described, but the present disclosure is not limited to this case. For example, the clamp 700 may be configured to have a C-shaped cross section.

In the second embodiment described above, the case where the clamp lower portion 720 of the clamp 700 is connected to the lower half portion 360 of the main body portion 300 by welding has been described, but the present disclosure is not limited to this case. For example, the main body 300 and the clamp 700 may be separably connected to each other. Thereby, the clamp 700 can be replaced according to the diameter of the power line 100. As a result, even when the diameter of the power line 100 is changed, the power line physical quantity measuring device 12 (power supply device 10) can be easily attached to the power line 100.

In the second embodiment described above, the case where the main body 300 has a double-cylinder structure has been described, but the present disclosure is not limited to this case. For example, the main body 300 does not have to have a double-cylinder structure as long as the main body 300 holds each member other than the temperature sensor 200 and has a structure capable of suppressing the intrusion of rainwater. .. Specifically, for example, the main body 300 may have a single cylinder structure having only an outer cylinder 340.

In the second embodiment described above, the case where the main body portion 300 has the hinge portion 370 has been described, but the present disclosure is not limited to this case. The main body 300 does not have to have the hinge 370. However, it is preferable that the main body portion 300 has the hinge portion 370 in that the upper half split portion 380 can be suppressed from falling.

In the second embodiment described above, the CT unit 520 for current measurement is heavier than the CT unit 420 for power supply, and the CT unit 520 for current measurement is provided on the side of the main body 300 closer to the clamp 700 than the CT unit 420 for power supply. However, the present disclosure is not limited to this case. For example, when the power supply CT unit 420 is heavier than the current measurement CT unit 520, the power supply CT unit 420 is provided on the side of the main body 300 closer to the clamp 700 than the current measurement CT unit 520. May be good.

In the second embodiment described above, the case where the communication unit 600 has an MCU has been described, but the present disclosure is not limited to this case. For example, the communication unit 600 may include a general-purpose computer having a CPU (Central Processing Unit), a RAM (Random Access Memory), and a storage device.

In the second and third embodiments described above, the case where the communication unit 600 is configured to transmit various data by multi-hop wireless communication has been described, but the present disclosure is not limited to this case. For example, if the communication unit 600 is configured to be capable of long-distance transmission, the communication unit 600 may be configured to directly transmit various data to a data aggregation transmission device or an electric power company.

In the fourth embodiment described above, the case where the power line 100 is configured as a solid-state insulated cable has been described, but the power line 100 is configured as an OF cable (Oil Field Cable) if it has a shielding layer. May be good.

In the above-described fourth embodiment, the case where the power supply device 10 (power line physical quantity measuring device 16) is applied to a power system in which at least a part of the power system is laid underground has been described, but the present disclosure is not limited to this case. The power supply unit 10 may be applied to a power system that is at least partially laid on the ground, underwater, or on the bottom of the water.

In the fourth embodiment described above, the case where the power supply core 422 is provided so as to surround the outer periphery of the sheath 160 of the power line 100 has been described, but the power supply core 422 is connected by gradually peeling off the power line 100. In the junction box 800, it may be provided so as to surround the conductor 110.

In the fourth embodiment described above, the case where the power line physical quantity measuring device 16 has, for example, a current measuring CT unit 520 and a current measuring unit 540 for measuring the current flowing through the power line 100 as physical quantity measuring units has been described. However, this disclosure is not limited to this case. The power line physical quantity measuring device 16 may have other physical quantity measuring units other than the current measuring CT unit 520 and the current measuring unit 540. Examples of other physical quantity measuring devices include a temperature sensor unit that measures the temperature of the power line 100.

In the fourth embodiment described above, the case where the power line physical quantity measuring device 16 is arranged in the normal connection portion NJ1 has been described, but the power line physical quantity measuring device 16 may be arranged in the insulated connection portion IJ1 or IJ2.

In the fourth embodiment described above, the case where the communication unit 600 of the power line physical quantity measuring device 16 is configured to both transmit and receive predetermined information has been described, but the communication unit 600 of the power line physical quantity measuring device 16 has been described. , May be configured to only transmit predetermined information. In this case, the communication core 662 only needs to show the magnetic unsaturated property in transmission.

In the fourth embodiment described above, the case where the power supply device 10 is applied as the power line physical quantity measuring device 16 has been described. However, if the power supply device 10 is a device that obtains power from the power line 100 as a power cable, the physical quantity measuring unit may be used. It may be a communication device that does not have. In this case, the communication device may be configured to relay predetermined information by, for example, multi-hop communication via the shielding layer 150.

In the fourth embodiment described above, the case where the power line physical quantity measuring device 16 communicates via the shielding layer 150 by PLC has been described, but the power line physical quantity measuring device 16 is in an environment where a predetermined radio wave reaches the transmission destination. If so, it may be configured to perform wireless communication.

<Preferable aspect of the present disclosure>
Hereinafter, preferred embodiments of the present disclosure will be added.

(Appendix 1)
A power supply core provided so as to surround a power line, and a power supply that is wound around the power supply core and generates an induced current by electromagnetic induction based on a change in magnetic flux generated in the power supply core by a current flowing through the power line. A coil, a current transformer for power supply, and
A power supply unit connected to the power supply current transformer unit and supplying power to a predetermined load based on the induced current generated by the power supply current transformer unit.
With
The power supply core is configured to be magnetically saturated with respect to a magnetic field generated by the current flowing through the power line when the current value of the current flowing through the power line is a predetermined current value equal to or less than the allowable current value of the power line. Power supply to be.

(Appendix 2)
In the magnetization curve shown by the power supply core, the current value of the power line when the magnetic field strength generated around the power line becomes the magnetic saturation point is the lower limit of the fluctuation range of the peak value of the current flowing through the power line. The power supply device according to Appendix 1, which is within ± 10%.

(Appendix 3)
Note 1 or 2 that the magnetic saturation point in the magnetization curve shown by the power supply core is located below the maximum value of the magnetic field strength generated around the power line when the current value of the power line is the allowable current value. The power supply described.

(Appendix 4)
The integrated value obtained by integrating the current values of the induced currents is the current value of the induced currents when the power supply core is not magnetically saturated and the induced currents are obtained as sinusoidal waves as the current value of the currents increases. The power supply device according to any one of Supplementary note 1 to Supplementary note 3, which is smaller than the integrated integrated value.

(Appendix 5)
When the current value of the current becomes large, the rate of increase of the integrated value obtained by integrating the current value of the induced current is smaller than the rate of increase of the integrated value obtained by integrating the current value of the current. The power supply device according to any one of.

(Appendix 6)
The slope when the absolute value of the current value of the induced current decreases from the peak value is steeper than the slope when the absolute value of the current value of the induced current rises to the peak value. The power supply device according to any one.

(Appendix 7)
The waveform of the induced current when the power supply core is magnetically saturated is zero in which the current value of the induced current becomes constant at 0 A for a predetermined time after the absolute value of the current value of the induced current drops from the peak value. The power supply device according to Appendix 6, which has a current region.

(Appendix 8)
A main body unit for holding the power supply current transformer unit and the power supply unit is provided outside the power line.
The main body
The inner cylinder through which the power line is inserted and the inner cylinder
An outer cylinder provided so as to surround the outer circumference of the inner cylinder and accommodating the current transformer unit for power supply and the power supply unit between the inner cylinder and itself.
Have,
The power supply device according to any one of Supplementary note 1 to Supplementary note 7, wherein the inner cylinder is separated into at least two in the axial direction.

(Appendix 9)
A power supply core provided so as to surround a power line, and a power supply that is wound around the power supply core and generates an induced current by electromagnetic induction based on a change in magnetic flux generated in the power supply core by a current flowing through the power line. A coil, a current transformer for power supply, and
A power supply unit connected to the power supply current transformer unit and supplying power based on the induced current generated in the power supply current transformer unit.
A current transformer unit for power supply and a main body unit that holds the power supply unit outside the power line.
With
The main body
The inner cylinder through which the power line is inserted and the inner cylinder
An outer cylinder provided so as to surround the outer circumference of the inner cylinder and accommodating the current transformer unit for power supply and the power supply unit between the inner cylinder and itself.
Have,
The inner cylinder is a power supply device that is separated into at least two in the axial direction.

(Appendix 10)
A main body unit for holding the power supply current transformer unit and the power supply unit is provided outside the power line.
The main body is divided in half along the axial direction.
The power supply device according to any one of Supplementary note 1 to Supplementary note 9, wherein the power supply coil and the power supply unit are housed inside one of the main body portions divided into two.

(Appendix 11)
The power supply core has a pair of half-split cores that are split in half along the axial direction.
At least one of the pair of half cores
The end of the pair of half cores that are joined together with the other
A straight portion extending linearly toward the end and a straight portion
The power supply device according to any one of Supplementary note 1 to Supplementary note 10 having the above.

(Appendix 12)
A voltage induced by electromagnetic induction based on a change in magnetic flux generated in the current measurement core by a current measurement core provided so as to surround the power line and the current flowing in the current measurement core wound around the current measurement core. A current measuring coil, which has a current measuring coil, and a current transformer section for measuring a current.
A current measuring unit connected to the current transformer unit for current measurement and measuring the current flowing through the power line based on the induced voltage output by the current transformer unit for current measurement.
With
Note that the current measuring core is configured so as not to be magnetically saturated with respect to the magnetic field generated by the current flowing through the power line within the range where the current value of the current flowing through the power line is equal to or less than the allowable current value of the power line. The power supply device according to any one of 1 to 11.

(Appendix 13)
Note 12 that the magnetic saturation point in the magnetization curve shown by the current measurement core is located higher than the maximum value of the magnetic field strength generated around the power line when the current value of the power line is the allowable current value. The power supply described.

(Appendix 14)
The power supply device according to any one of Supplementary note 1 to Supplementary note 13, further comprising a communication unit for communicating predetermined information by the electric power supplied from the power supply unit.

(Appendix 15)
A communication current transformer unit that is inductively coupled to the shielding layer of the power line is provided.
The power supply device according to Appendix 14, wherein the communication unit communicates the information via the shielding layer by the communication current transformer unit.

(Appendix 16)
The communication current transformer unit is
A communication core provided so as to surround the conductive wire connected to the shielding layer,
A communication coil wound around the communication core,
Have,
The communication unit causes a transmission current to flow through the communication coil, causes a change in magnetic flux in the communication core due to the transmission current, and causes the signal current related to the information to be generated in the conductive wire by electromagnetic induction as an induced current. Is configured to
The communication core is configured so that the current value of the transmission current is not magnetically saturated with respect to the magnetic field generated by the transmission current flowing through the communication coil within a range necessary for performing communication related to the information. The power supply device according to Appendix 15.

(Appendix 17)
The communication current transformer unit is
A communication core provided so as to surround the conductive wire connected to the shielding layer,
A communication coil that generates a received current as an induced current by electromagnetic induction based on a change in magnetic flux generated in the communication core by a signal current related to the information that is wound around the communication core and flows through the conductive wire.
Have,
The communication unit is configured to demodulate the received current generated by the communication current transformer unit to acquire the information.
The communication core is configured so that the current value of the signal current does not magnetically saturate with respect to the magnetic field generated by the signal current flowing through the conductive wire within the range necessary for performing communication related to the information. The power supply device according to 15 or 16.

(Appendix 18)
A power supply core provided so as to surround a power line, and a power supply that is wound around the power supply core and generates an induced current by electromagnetic induction based on a change in magnetic flux generated in the power supply core by a current flowing through the power line. A coil, a current transformer for power supply, and
A power supply unit connected to the power supply current transformer unit and supplying power based on the induced current generated in the power supply current transformer unit.
A physical quantity measuring unit that measures a physical quantity related to the power line by the electric power supplied from the power supply unit, and a physical quantity measuring unit.
With
The power supply core is configured to be magnetically saturated with respect to a magnetic field generated by the current flowing through the power line when the current value of the current flowing through the power line is a predetermined current value equal to or less than the allowable current value of the power line. Power line physical quantity measuring device.

(Appendix 19)
An induced current is generated by electromagnetic induction based on a change in magnetic flux generated in the power supply core by a power supply core provided in an annular shape so as to surround the power line and a current flowing in the power supply line wound around the power supply core. A power supply coil, a power supply current transformer unit, and
A power supply unit connected to the power supply current transformer unit and supplying power based on the induced current generated in the power supply current transformer unit.
With the communication unit that communicates predetermined information by the electric power supplied from the power supply unit,
With
The power supply core is configured to be magnetically saturated with respect to a magnetic field generated by the current flowing through the power line when the current value of the current flowing through the power line is a predetermined current value equal to or less than the allowable current value of the power line. Communication device to be.

(Appendix 20)
A communication system used in a power system in which the shielding layer of a power line is cross-bonded.
A plurality of communication devices configured to be able to communicate with each other via the shielding layer by inductively coupled to the shielding layer are provided.
Each of the plurality of communication devices
An induced current is generated by electromagnetic induction based on a change in magnetic flux generated in the power supply core by a power supply core provided in an annular shape so as to surround the power line and a current flowing in the power supply line wound around the power supply core. A power supply coil, a power supply current transformer unit, and
A power supply unit connected to the power supply current transformer unit and supplying power based on the induced current generated in the power supply current transformer unit.
A communication current transformer unit inductively coupled to the shielding layer,
A communication unit that uses the electric power supplied from the power supply unit to communicate the information via the shielding layer by the communication current transformer unit.
With
The power supply core is configured to be magnetically saturated with respect to a magnetic field generated by the current flowing through the power line when the current value of the current flowing through the power line is a predetermined current value equal to or less than the allowable current value of the power line. Communication system to be used.

10 Power supply device 12, 12a, 12b Power line physical quantity measuring device 14 Communication device 16 Power line physical quantity measuring device 20 Communication system 100 Power line 110 Conductor 130 Insulation layer 150 Shielding layer 152 Conductive wire 154 Conductive wire 160 Sheath 200 Temperature sensor unit 280 Lead wire 300 Main body Part 320 Inner cylinder 322 Insulation part 330 Housing part 340 Outer cylinder 350 Lid part 360 Lower half part 370 Hing part 380 Upper half part 420 Power current transformer part (power supply CT part)
420d Lower part for power supply 420u Upper part for power supply 422 Upper part for power supply 423 Half-split core 423e End part 423l Straight part 423r Arc part 424 Power supply coil 440 Power supply part 520 Current transformer part (CT part for current measurement)
520d Lower part for current measurement 520u Upper part for current measurement 522 Current measurement core 523 Half-split core 523e End part 523l Straight part 523r Arc part 524 Current measurement coil 540 Current measurement part 600 Communication part 620 Antenna 640 Communication part 660 Communication current transformer Department (CT unit for communication)
662 Communication core 664 Communication coil 700 Clamp 720 Clamp lower 740 Clamp upper 800 Junction box CB Cross bond section IJ1, IJ2 Insulated connection NJ1, NJ2 Normal connection a, a1 to a5, b, b1 to b5, c, c1 ~ C5 Power line

Claims (9)

A power supply core provided so as to surround a power line, and a power supply that is wound around the power supply core and generates an induced current by electromagnetic induction based on a change in magnetic flux generated in the power supply core by a current flowing through the power line. A coil, a current transformer for power supply, and
A power supply unit connected to the power supply current transformer unit and supplying power to a predetermined load based on the induced current generated by the power supply current transformer unit.
With
The power supply core is configured to be magnetically saturated with respect to a magnetic field generated by the current flowing through the power line when the current value of the current flowing through the power line is a predetermined current value equal to or less than the allowable current value of the power line. Power supply to be. In the magnetization curve shown by the power supply core, the current value of the power line when the magnetic field strength generated around the power line becomes the magnetic saturation point is the lower limit of the fluctuation range of the peak value of the current flowing through the power line. The power supply device according to claim 1, which is within ± 10%. A main body unit for holding the power supply current transformer unit and the power supply unit is provided outside the power line.
The main body
The inner cylinder through which the power line is inserted and the inner cylinder
An outer cylinder provided so as to surround the outer circumference of the inner cylinder and accommodating the current transformer unit for power supply and the power supply unit between the inner cylinder and itself.
Have,
The power supply device according to claim 1 or 2, wherein the inner cylinder is separated into at least two in the axial direction. A power supply core provided so as to surround a power line, and a power supply that is wound around the power supply core and generates an induced current by electromagnetic induction based on a change in magnetic flux generated in the power supply core by a current flowing through the power line. A coil, a current transformer for power supply, and
A power supply unit connected to the power supply current transformer unit and supplying power based on the induced current generated in the power supply current transformer unit.
On the outside of the power line, the current transformer unit for power supply and the main body unit that holds the power supply unit,
With
The main body
The inner cylinder through which the power line is inserted and the inner cylinder
An outer cylinder provided so as to surround the outer circumference of the inner cylinder and accommodating the current transformer unit for power supply and the power supply unit between the inner cylinder and itself.
Have,
The inner cylinder is a power supply device that is separated into at least two in the axial direction. A main body unit for holding the power supply current transformer unit and the power supply unit is provided outside the power line.
The main body is divided in half along the axial direction.
The power supply device according to any one of claims 1 to 4, wherein the power supply coil and the power supply unit are housed inside one of the main body portions divided into two. The power supply core has a pair of half-split cores that are split in half along the axial direction.
At least one of the pair of half cores
The end of the pair of half cores that are joined together with the other
A straight portion extending linearly toward the end and a straight portion
The power supply device according to any one of claims 1 to 5. A voltage induced by electromagnetic induction based on a change in magnetic flux generated in the current measurement core by a current measurement core provided so as to surround the power line and the current flowing in the current measurement core wound around the current measurement core. A current measuring coil, which has a current measuring coil, and a current transformer section for measuring a current.
A current measuring unit connected to the current transformer unit for current measurement and measuring the current flowing through the power line based on the induced voltage output by the current transformer unit for current measurement.
With
The current measuring core is configured so as not to be magnetically saturated with respect to the magnetic field generated by the current flowing through the power line within a range in which the current value of the current flowing through the power line is equal to or less than the allowable current value of the power line. The power supply device according to any one of items 1 to 6. A power supply core provided so as to surround a power line, and a power supply that is wound around the power supply core and generates an induced current by electromagnetic induction based on a change in magnetic flux generated in the power supply core by a current flowing through the power line. A coil, a current transformer for power supply, and
A power supply unit connected to the power supply current transformer unit and supplying power based on the induced current generated in the power supply current transformer unit.
A physical quantity measuring unit that measures a physical quantity related to the power line by the electric power supplied from the power supply unit, and a physical quantity measuring unit.
With
The power supply core is configured to be magnetically saturated with respect to a magnetic field generated by the current flowing through the power line when the current value of the current flowing through the power line is a predetermined current value equal to or less than the allowable current value of the power line. Power line physical quantity measuring device. A power supply core provided so as to surround a power line, and a power supply that is wound around the power supply core and generates an induced current by electromagnetic induction based on a change in magnetic flux generated in the power supply core by a current flowing through the power line. A coil, a current transformer for power supply, and
A power supply unit connected to the power supply current transformer unit and supplying power based on the induced current generated in the power supply current transformer unit.
With the communication unit that communicates predetermined information by the electric power supplied from the power supply unit,
With
The power supply core is configured to be magnetically saturated with respect to a magnetic field generated by the current flowing through the power line when the current value of the current flowing through the power line is a predetermined current value equal to or less than the allowable current value of the power line. Communication device to be.

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