JP7059609B2 - Wiring structure of power meter - Google Patents

Description

The present invention relates to a wiring structure of a power measuring device. In particular, when installing a power metering device consisting of a check terminal connected to a transformer, a power meter for buying power, and a power meter for selling power indoors, power measuring that properly wires between these facilities. Regarding the wiring structure of the device.

For example, a watt-hour meter for selling electricity that measures the amount of electricity sold to an electric power company and a watt-hour meter for purchasing electricity that measures the amount of electricity purchased from the electric power company are combined and sold to the electric power company. A watt-hour meter that can handle either a total purchase method of purchasing all electric power or a surplus purchase method of selling surplus electric power to an electric power company is disclosed (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2015-16331

As disclosed in Patent Document 1, surplus electric power generated by a solar power generation facility or the like can now be sold to an electric power company. In this case, conventionally, it is necessary for the power seller to install a power meter for selling power that measures the amount of power sold to the power company and a transformer (VCT) that transforms the power sold to the power company. was there.

However, in light of the changes in various systems accompanying the full liberalization of electricity retailing and the introduction of low-voltage smart meters, it was changed to own and manage the electricity meter for electricity sales by the electric power company. Along with this change, the electric power company will perform the work of wiring each equipment of the electric power meter for purchasing power owned by the electric power company, the added electric power meter for selling electric power, and the transformer owned by the electric power company. It is being carried out.

In the wiring work described above, a plurality of electric cables (that is, color codes) having insulating coatings color-coded with different hues are used to wire between the terminal blocks provided in each facility. By using color codes that are color-coded with different hues, it is possible to visually clarify the interconnection relationship between the terminals of each terminal block.

In the conventional wiring work, out of the seven electric cables that connected the check terminal and the power meter for power purchase, two electric cables that became unnecessary due to the addition of the power meter for selling power were used. , The terminals were treated so that they could be insulated at both ends of the cable cover that covered the circumference of the seven electric cables. In other words, there was a lot of waste such as accommodating unnecessary electric cables inside the cable cover.

Also, in the conventional wiring work, with the addition of the power meter for selling power, the power meter for selling power and the check terminal were connected with two electric cables, but the check terminal is for purchasing power. Since the electric cable of the same color extending from the power meter is connected, it was one of the causes of wiring mistakes.

From the above, when installing a power meter consisting of a check terminal connected to a transformer, a power meter for purchasing power, and a power meter for selling power indoors, the waste of wiring is reduced and wiring is performed. There is a demand for a wiring structure for a power measuring device that does not induce mistakes. And the above can be said to be the problem of this technique.

The present invention has been made in view of such a problem, and a power measuring device composed of a check terminal connected to a transformer, a power meter for purchasing power, and a power meter for selling power is installed indoors. It is an object of the present invention to provide a wiring structure of a power measuring device for properly wiring between these facilities without reducing the waste of wiring and inducing wiring mistakes.

The present inventors merge the first electric cable group in which the check terminal and the power meter for power purchase are wired, and the electric cable pair in which the check terminal and the power meter for power sale are wired toward the check terminal. By covering the circumference of the electric cable with a cable cover and providing an identification means having a hue different from the hue of the electric cable extending from the power meter for power purchase to the check terminal on the electric cable on the check terminal side of the electric cable pair. We thought that it would be possible to properly wire between these facilities without reducing wiring waste and inducing wiring mistakes, and based on this, we invented the following new wiring structure for power measuring devices. ..

(1) The wiring structure of the power measuring device according to the present invention is used when a power measuring device composed of a check terminal connected to a transformer, a power meter for purchasing power, and a power meter for selling power is installed indoors. , A first electric cable in which the check terminal and the power meter for power purchase are wired, which is a wiring structure of a power measuring device in which a plurality of electric cables having color-coded insulation coatings are used to wire between these facilities. A group, a second electric cable group in which the power purchase power meter and the power sale power meter are wired, an electric cable pair in which the check terminal and the power sale power meter are wired, and the above. It is provided with a cable cover that joins the first electric cable group and the electric cable pair toward the check terminal and covers the periphery of these electric cables.

(2) It is preferable that the electric cable of the electric cable pair is provided with an identification means having a hue different from the hue of the electric cable extending from the power purchase power meter to the check terminal.

(3) The identification means may consist of an adhesive tape wound around the outer circumference of the electric cable of the electric cable pair.

(4) The identification means may consist of an insulating collar partially attached to the outer periphery of the electric cable of the electric cable pair inside the check terminal.

(5) The identification means may consist of an identification tape partially attached to the outer periphery of the electric cable of the electric cable pair inside the check terminal.

In the wiring structure of the power measuring device according to the present invention, the first electric cable group in which the check terminal and the power meter for power purchase are wired, and the electric cable pair in which the check terminal and the power meter for selling power are wired are checked terminals. Since the cables are covered with a cable cover around these electric cables, they can be wired without waste.

The wiring structure of the power measuring device according to the present invention induces a wiring error because the electric cable of the electric cable pair is provided with an identification means having a hue different from the hue of the electric cable extending from the power meter for power purchase to the check terminal. It is possible to properly wire between the equipment of the power measuring device without doing so.

It is a functional block diagram which shows the circuit structure of the wiring structure of the electric power measuring apparatus according to one Embodiment of this invention. It is a functional block diagram which shows the circuit structure of the wiring structure of the electric power measuring apparatus according to the said embodiment, and is the figure which shows the actual wiring of the wiring structure of an electric power measuring apparatus. It is a functional block diagram which shows the circuit structure of the wiring structure of the electric power measuring apparatus by the said embodiment, and is the figure which shows the actual wiring of the main part of the wiring structure of an electric power measuring apparatus. It is a table showing the wiring color of the electric cable that electrically connects between the facilities of the power measuring device according to the said embodiment, and Table 1 of FIG. 4 shows the power meter for buying power and the power meter for selling power. The wiring table, Table 2 of FIG. 4 is the wiring table of the power meter for power purchase and the check terminal, and Table 3 of FIG. 4 is the wiring table of the power meter for selling power and the check terminal.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
[Wiring structure of power meter]
First, the wiring structure of the power measuring device according to the embodiment of the present invention will be described.

FIG. 1 is a functional block diagram showing a circuit configuration of a wiring structure of a power measuring device according to an embodiment of the present invention.

FIG. 2 is a functional block diagram showing a circuit configuration of the wiring structure of the power measuring device according to the embodiment, and is a diagram showing the actual wiring of the wiring structure of the power measuring device.

FIG. 3 is a functional block diagram showing a circuit configuration of the wiring structure of the power measuring device according to the embodiment, and is a diagram showing the actual wiring of a main part of the wiring structure of the power measuring device.

FIG. 4 is a table showing the wiring colors of electric cables for electrically connecting each facility of the power measuring device according to the above embodiment, and Table 1 of FIG. 4 shows a power meter for purchasing power and a power meter for selling power. The wiring table of the power meter, Table 2 of FIG. 4 is the wiring table of the power meter for power purchase and the check terminal, and Table 3 of FIG. 4 is the wiring table of the power meter for selling power and the check terminal.

Referring to FIGS. 1 to 3, the power metering device 10 according to the embodiment of the present invention includes a transformer Vc and a check terminal TT. Further, the power measuring device 10 includes a power meter for purchasing power 1 Me and a power meter for selling power 2 Me.

Referring to FIGS. 1 to 3, the transformer Vc is installed, for example, on a utility pole. That is, the transformer Vc is installed outdoors. On the other hand, the check terminal TT, the power meter for buying power 1Me, and the power meter for selling power 2Me are housed in a cabinet (not shown). That is, the check terminal TT, the power meter for buying power 1 Me, and the power meter for selling power 2 Me are installed indoors. The check terminal TT, the power meter for buying power 1 Me, and the power meter for selling power 2 Me can shield wind and rain or direct sunlight.

Referring to FIG. 1 or FIG. 2, the transformer (VCT) Vc can operate the power purchase power meter 1 Me and the power sale power meter 2 Me by transforming the large current of the high voltage path into a small current. Further, the transformer Vc can step down the voltage of the high voltage path to a low voltage and apply a low voltage to the power purchase power meter 1 Me and the power sale power meter 2 Me.

Referring to FIG. 1 or FIG. 2, the secondary terminal block 2Vc of the transformer Vc is electrically connected to one side of the check terminal TT. In the wiring structure of the power measuring device 10, one side of the secondary side terminal block 2Vc and the check terminal TT is connected by seven electric cables Cb having an insulating coating color-coded. More specifically, one side of the secondary terminal block 2Vc and the check terminal TT is black (BK), red (RD), blue (BU), brown (BN), yellow (YE), and white (WT). , Green (GN) color-coded seven electrical cables Cb are connected.

Referring to FIG. 2, seven electric cables Cb connecting the secondary side terminal block 2Vc and one side of the check terminal TT bundle those electric cables Cb. Further, the bundled electric cables Cb are surrounded by a hose-shaped flexible chromatic cable cover 2c. As a result, it is possible to prevent direct sunlight from deteriorating the insulating coating of the electric cable Cb.

Referring to FIGS. 1 to 3, the other side of the check terminal TT and the power purchase power meter 1Me are connected by five electric cables Cb whose insulation coating is color-coded. More specifically, the other side of the check terminal TT and the power meter 1Me for power purchase are color-coded with black (BK), red (RD), blue (BU), brown (BN), and white (WT). It is connected by five electric cables Cb (see Table 2 in FIG. 4). That is, the check terminal TT and the power purchase power meter 1Me are wired by the first electric cable group G1 composed of five color-coded electric cables Cb (see FIG. 3).

Further, referring to FIGS. 1 to 3, the power-purchasing power meter 1Me and the power-selling power meter 2Me are connected by five electric cables Cb having an insulating coating color-coded. More specifically, the power meter 1 Me for buying power and the power meter 2 Me for selling power are color-coded in red (RD), blue (BU), yellow (YE), white (WT), and green (GN). It is connected by five electric cables Cb (see Table 1 in FIG. 4). That is, the power purchase power meter 1 Me and the power sale power meter 2 Me are wired by a second electric cable group G2 composed of five color-coded electric cables Cb (see FIG. 3).

Further, referring to FIGS. 1 to 3, in the wiring structure of the power measuring device 10, the power meter 2Me for selling power and the other side of the check terminal TT are connected by two electric cables Cb having an insulating coating color-coded. ing. More specifically, the power meter 2Me for selling power and the check terminal TT are connected by two electric cables Cb color-coded in black (BK) and brown (BN) (see Table 3 in FIG. 4). ). That is, the power meter 2Me for selling power and the check terminal TT are wired by an electric cable pair CP consisting of two color-coded electric cables Cb (see FIG. 2 or FIG. 3).

With reference to FIGS. 1 to 3, the electricity generated by the electric power company flows from the terminal number 1S of the power purchase meter 1Me to the terminal number 1L via the transformer Vc, and the electricity is purchased. By flowing from the terminal number 3S of the electric power meter 1Me to the terminal number 3L, the amount of electric power for power purchase can be measured.

On the other hand, with reference to FIGS. 1 to 3, the electricity generated by the electric power company is transferred from the terminal number 1L of the power meter 2Me for sale to the terminal number 1S via the power meter 1Me for purchase. The amount of power for purchasing power is not measured by flowing and flowing from the terminal number 3L of the power meter 2Me for selling power to the terminal number 3S.

With reference to FIGS. 1 to 3, the electricity generated by the photovoltaic power generation facility G or the like and sold to the electric power company passes through the transformer Vc, and the current is the terminal number 1S of the power meter 2Me for selling electricity. The amount of power for selling power can be measured by flowing from the terminal number 1L to the terminal number 3L and flowing from the terminal number 3S of the power selling power meter 2Me to the terminal number 3L.

On the other hand, referring to FIGS. 1 to 3, the electricity generated by the photovoltaic power generation facility G or the like and generated by the electric power company is passed through the power selling power meter 2Me, and the current is the power purchasing power meter. The amount of power for selling power is not measured by flowing from the terminal number 1L of 1Me to the terminal number 1S and flowing from the terminal number 3L of the power purchase meter 1Me to the terminal number 3S.

As described above, referring to FIGS. 1 to 3, the power purchase watt-hour meter 1Me and the power-selling watt-hour meter 2Me are wired so that the directions of the currents flowing inside the watt-hour meters are different. , Either the amount of power for buying power or the amount of power for selling power can be measured.

Referring to FIGS. 1 to 3, the terminal number P1 of the power meter for power purchase 1Me is a red (RD) electric cable Cb extending from the check terminal TT and a red (RD) extending from the power meter 2Me for selling power. The electric cable Cb of is connected in series.

Further, referring to FIGS. 1 to 3, the terminal number P3 of the power meter for power purchase 1Me is a blue (BU) electric cable Cb extending from the check terminal TT and a blue (blue) extending from the power meter 2Me for selling power. The electric cable Cb of BU) is connected in series.

Further, referring to FIGS. 1 to 3, the terminal number P2 of the power meter for power purchase 1Me is a white (WT) electric cable Cb extending from the check terminal TT and white extending from the power meter 2Me for selling power. The electric cable Cb of (WT) is connected in series.

With reference to FIGS. 1 to 3, the wiring structure of the power measuring device 10 according to the embodiment is of red (RD), blue (BU), and white (WT) extending from the check terminal TT to the power purchase power meter 1Me. The electric cable Cb and the red (RD), blue (BU), and white (WT) electric cables Cb extending from the power meter 2Me for selling power to the power meter 1Me for buying power are connected in series.

With reference to FIGS. 1 to 3, for example, the core wires of the red (RD), blue (BU), and white (WT) electric cables Cb are crimped with a ring sleeve (not shown), and electricity extending from the check terminal TT. It is preferable to connect the cable Cb and the electric cable Cb extending from the power meter 2Me for selling electricity in a longitudinal manner.

Referring to FIG. 1, the red (RD) and blue (BU) electric cables Cb are voltage lines, and the white (WT) electric cable Cb is connected to the ground, so that the red (RD) is used. Even if the blue (BU) and white (WT) electric cables Cb are connected in series, there is no concern that the transformer Vc will be loaded.

With reference to FIG. 2 or FIG. 3, it is not preferable to connect the electric cable to CP extending from the power meter 2Me for selling power toward the check terminal TT in a longitudinal manner in the middle of the path. This is because the electric cable to CP is a current line, so there is a concern that a load may be applied to the transformer Vc due to a defective longitudinal connection due to aged deterioration.

Referring to FIG. 2, the wiring structure of the power measuring device 10 according to the embodiment joins the first electric cable group G1 and the electric cable pair CP toward the check terminal TT. The cable cover 1c covers the periphery of the electric cable Cb of the first electric cable group G1 and the electric cable Cb of the electric cable vs. CP.

With reference to FIGS. 1 to 3, the wiring structure of the power measuring device according to the conventional technique is as follows: With the addition of the power meter 2Me, the two electric cables Cb that became unnecessary were terminally treated so that they could be insulated at both ends of the cable cover that covered the periphery of the seven electric cables Cb. That is, there was a lot of waste such as accommodating an unnecessary electric cable Cb inside the cable cover.

Referring to FIGS. 1 to 4, the wiring structure of the power measuring device 10 according to the embodiment includes the first electric cable group G1 in which the check terminal TT and the power purchase power meter 1Me are wired, the check terminal TT, and the power sale. Since the electric cable pair CP wired with the power meter 2Me is merged toward the check terminal TT and the circumference of these electric cables Cb is covered with the cable cover 1c, wiring can be performed without waste.

Referring to FIGS. 1 to 4, seven color-coded electric cables Cb are connected to the terminal block of the power meter 2Me for selling electricity. As a result, the color-coded electric cable Cb corresponding to the terminal number can be connected to the power selling power meter 2Me without misidentification.

Referring to FIGS. 1 to 3, the black (BK) electric cable Cb connected to the terminal number 1S of the power meter for selling power 2Me is connected to the terminal number 1L of the check terminal TT (Table of FIG. 4). See 3). Further, the brown (BN) electric cable Cb connected to the terminal number 3S of the power meter for selling power 2Me is connected to the terminal number 3L of the check terminal TT (see Table 3 in FIG. 4).

On the other hand, referring to FIGS. 1 to 3, a black (BK) electric cable Cb is connected to the terminal number 1S of the check terminal TT (see Table 2 in FIG. 4). Further, a brown (BN) electric cable Cb is connected to the terminal number 3S of the check terminal TT (see Table 2 in FIG. 4). That is, it induces a wiring error.

With reference to FIG. 1, in order to correctly connect the black (BK) electric cable Cb or the brown (BN) electric cable Cb to the corresponding terminal number of the check terminal TT, the power meter for power purchase 1Me is used as a check terminal. It is preferable that the electric cable Cb of the electric cable vs. CP is provided with an identification means having a hue different from the hue of the electric cable Cb extending to the TT.

With reference to FIG. 2, a green (GN) adhesive tape is wound around the outer circumference of the electric cable Cb on the black (BK) electric cable Cb connected to the terminal number 1L of the check terminal TT, and the check terminal TT is used. The brown (BN) electric cable Cb connected to the terminal number 3L of the above can be used as an identification means for suppressing wiring errors by winding a yellow (YE) adhesive tape around the outer circumference of the electric cable Cb. ..

Further, referring to FIG. 1 or FIG. 3, the black (BK) electric cable Cb connected to the terminal number 1L of the check terminal TT has the outer circumference of the black (BK) electric cable Cb inside the check terminal TT. The brown (BN) electric cable Cb, which is connected to the terminal number 3L of the check terminal TT, while the green (GN) insulating collar is partially attached to the inside of the check terminal TT, is the brown (BN) electric cable. By partially attaching a yellow (YE) insulating collar to the outer periphery of the Cb, it can be used as an identification means for suppressing wiring errors.

In the embodiment, with reference to FIG. 1 or FIG. 3, in order to connect the black (BK) electric cable Cb or the brown (BN) electric cable Cb to the corresponding terminal number of the check terminal TT, the check terminal TT A green (GN) identification tape 1Tc is partially attached to the black (BK) electric cable Cb connected to the terminal number 1L, and brown (BN) electricity connected to the terminal number 3L of the check terminal TT. A yellow (YE) identification tape 2Tc is partially attached to the cable Cb.

[Action of wiring structure of power measuring device]
Next, the operation and effect of the wiring structure of the power measuring device 10 according to the embodiment will be described. Referring to FIG. 2 or FIG. 3, the wiring structure of the power measuring device 10 according to the embodiment joins the first electric cable group G1 and the electric cable pair CP toward the check terminal TT. The cable cover 1c covers the periphery of the electric cable Cb of the first electric cable group G1 and the electric cable Cb of the electric cable vs. CP.

With reference to FIGS. 1 to 3, the wiring structure of the power measuring device according to the conventional technique is as follows: With the addition of the power meter 2Me, the two electric cables Cb that became unnecessary were terminally treated so that they could be insulated at both ends of the cable cover that covered the periphery of the seven electric cables Cb. That is, there was a lot of waste such as accommodating an unnecessary electric cable Cb inside the cable cover.

Referring to FIGS. 1 to 4, the wiring structure of the power measuring device 10 according to the embodiment includes the first electric cable group G1 in which the check terminal TT and the power purchase power meter 1Me are wired, the check terminal TT, and the power sale. Since the electric cable pair CP wired with the power meter 2Me is merged toward the check terminal TT and the circumference of these electric cables Cb is covered with the cable cover 1c, wiring can be performed without waste.

Referring to FIGS. 1 to 3, the black (BK) electric cable Cb connected to the terminal number 1S of the power meter for selling power 2Me is connected to the terminal number 1L of the check terminal TT (Table of FIG. 4). See 3). Further, the brown (BN) electric cable Cb connected to the terminal number 3S of the power meter for selling power 2Me is connected to the terminal number 3L of the check terminal TT (see Table 3 in FIG. 4).

On the other hand, referring to FIGS. 1 to 3, a black (BK) electric cable Cb is connected to the terminal number 1S of the check terminal TT (see Table 2 in FIG. 4). Further, a brown (BN) electric cable Cb is connected to the terminal number 3S of the check terminal TT (see Table 2 in FIG. 4). That is, there is a concern that the wiring structure of the power measuring device according to the prior art may induce a wiring error.

With reference to FIG. 1, in order to correctly connect the black (BK) electric cable Cb or the brown (BN) electric cable Cb to the corresponding terminal number of the check terminal TT, the wiring structure of the power measuring device 10 according to the embodiment. Provided an identification means having a hue different from the hue of the electric cable Cb extending from the power purchase power meter 1Me to the check terminal TT in the electric cable Cb of the electric cable vs. CP.

With reference to FIG. 1 or 2, the identification means may consist of an adhesive tape (not shown) wound around the outer circumference of the electric cable Cb of the electric cable vs. CP, and the identification means is a check terminal TT. It may consist of an insulating collar (not shown) partially attached to the outer circumference of the electrical cable vs. CP electrical cable Cb inside.

In the embodiment, referring to FIG. 1 or FIG. 3, a green (GN) identification tape 1Tc is partially attached to the black (BK) electric cable Cb connected to the terminal number 1L of the check terminal TT. At the same time, a yellow (YE) identification tape 2Tc is partially attached to the brown (BN) electric cable Cb connected to the terminal number 3L of the check terminal TT. This makes it possible to suppress wiring errors caused by the electric cables Cb of the same color.

The wiring structure of the power measuring device according to the present invention can be expected to have the following effects.
(1) Since the wiring structure is simple, there is no need to worry about erroneous wiring, and it is easy to check the wiring.
(2) Wiring is easy to handle.
(3) There is no need for extra work such as terminal processing of unused electric cables.
(4) By attaching an identification tape having a hue different from the hue of the electric cable of the first electric cable group extending from the power meter for power purchase to the electric cable on the check terminal side extending from the power meter for selling power. Wiring mistakes can be suppressed.

1c cable cover 1Me power meter for power purchase 2Me power meter for power sale 10 power meter CP electric cable vs. G1 1st electric cable group G2 2nd electric cable group TT check terminal Vc transformer (VCT)

Claims (4)

When installing a power meter consisting of a check terminal connected to a transformer, a power meter for buying power, and a power meter for selling power indoors, use multiple electric cables with color-coded insulation coatings. It is a wiring structure of a power measuring device that is wired between these facilities.
The first electric cable group in which the check terminal and the power meter for power purchase are wired, and
A second electric cable group in which the power meter for purchasing power and the power meter for selling power are wired, and
An electric cable pair in which the check terminal and the power meter for selling power are wired, and
A cable cover that joins the first electric cable group and the electric cable pair toward the check terminal and covers the periphery of these electric cables is provided.
A wiring structure of a power measuring device in which an identification means having a hue different from that of an electric cable extending from the power meter for power purchase to the check terminal is provided on the electric cable of the electric cable pair . The wiring structure of the power measuring device according to claim 1 , wherein the identification means comprises an adhesive tape wound around the outer periphery of the electric cable of the electric cable pair. The wiring structure of the power measuring device according to claim 1 , wherein the identification means comprises an insulating collar partially attached to the outer periphery of the electric cable of the electric cable pair inside the check terminal. The wiring structure of the power measuring device according to claim 1 , wherein the identification means comprises an insulating collar partially attached to the outer periphery of the electric cable of the electric cable pair inside the check terminal.

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