JP2002313450A - Electricity measuring wire fitting and power converting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily measure voltage and electric power. SOLUTION: Insulating covers 21, 22 and 23 are installed on a coated wire for measuring voltage, and tips of connection members 31, 32 and 33 inside the covers 21, 22 and 23 are inserted to penetrate insulating coating to be electrically connected to conductors. Electrical connection work can be easily conducted as the coated wire is in a hot-line state. The connection members 31, 32 and 33 are connected through insulated wires 24, 25 and 26 to terminals 34, 35 and 36 in a female connector part 27. The female connector part 27 may be directly connected to a measuring device, or to the measuring device through a signal transmission line 29 having a male connector part 28 connected at a tip for measuring voltage or electric power.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric measurement line fixture for electric measurement in a power supply system, a transmission / distribution line in a customer premises, an internal wiring of a power device, and a power conversion method.

[0002]

2. Description of the Related Art Conventionally, in a power supply system for transmitting and distributing power from a supplier such as a power company to a power consumer such as a factory, a building, or a general household, voltage, current, power, and the like are measured. Is managed so that power transmission and distribution is performed properly. There are a wide variety of locations where measurement is performed, such as power transmission and distribution lines, premises wiring, and power equipment internal wiring.

FIG. 13 shows a conventional typical configuration for electric measurement. FIG. 13A shows an appearance of a control panel 1 installed near a power device or the like. In the control panel 1,
An openable and closable door 2 is provided. FIG. 13B shows an outline of a measurement wiring state that can be seen when the door 2 of the control panel 1 is opened. A typical device housed inside the control panel 1 is a circuit breaker 3 or the like. The circuit breaker 3 is connected to a power transmission and distribution system via a power supply side wiring 4, connected to a load using electric power via a load side wiring 5, and used for ON / OFF of electric power supplied to the load. . The voltage supplied to the load is led, for example, as two phases of three-phase alternating current from the load-side connection terminal 6 of the circuit breaker 3 to the primary sides of the measuring transformers 8 and 9 via the voltage measurement wiring 7. . The secondary sides of the instrument transformers 8 and 9 are connected to a voltage input terminal of the power converter 10. The current supplied to the load is obtained by attaching the measurement current transformers 11 and 12 to the load-side wiring 5 for two phases for measuring the voltage, and connecting the secondary sides of the measurement current transformers 11 and 12 to the power converter. 10 current input terminals.

[0004] A relatively high voltage of several hundred V to several kV is normally applied to the power supply side wiring 4 and the load side wiring 5, and a large current flows. For this reason, it is necessary to use a conductive wire having a thickness corresponding to the current capacity and to provide electrical insulation corresponding to the voltage. The instrument transformers 8, 9 are used to convert high voltage to a standard measuring voltage of about 110V. The power converter 10 measures the amount of power based on the converted voltage. Since the current required for voltage measurement is relatively small, the current capacity of the voltage measurement wiring 7 may be small. Therefore, although the voltage measurement wiring 7 is provided with electrical insulation corresponding to the working voltage, a relatively thin insulated wire can be used as a whole.

[0005] The power converter 10 also requires current measurement. For current measurement, the current transformers 11 and 12 for measurement are installed, and the output on the secondary side is connected to the current input terminal of the power converter 10. The measurement current transformers 11 and 12 are, for example, about 5 A from the secondary winding wound around the iron core, with the load side wiring 5 penetrating through the inner space of the electrically insulated annular iron core to become the primary side. Take out the standard secondary output current of In current measurement, sufficient electrical insulation can be performed at the measurement current transformers 11 and 12.

[0006]

If a cogeneration system or the like is introduced to achieve overall energy savings, the customer will also generate power, which may be used together with commercial power received through the power transmission and distribution system. . When a customer uses both internally generated electric power and commercial electric power, it is necessary to avoid reverse power flow in which the electric power inside the customer flows out to the transmission and distribution system. In order to avoid reverse power flow, it is necessary to perform electrical measurement more finely than before.

In power measurement, voltage measurement and current measurement are required. In the current measurement, if a split type in which an iron core portion can be split is used instead of the measurement current transformers 11 and 12 as shown in FIG. Measurement can be performed relatively easily.

However, in voltage measurement, it is necessary to directly connect a measuring wire to a conductive portion such as a wire to be measured. The voltage measuring wire is, for example, a circuit breaker 1 shown in FIG.
Although it can be connected to the load side connection terminal 6 or the like, it is necessary to perform a work for ensuring the connection. For this reason, although current measurement can be performed relatively easily,
When installing a power converter, it is necessary to carry out installation work for measuring wires and remodel equipment. This requires a great deal of effort and expense.

[0009] Further, since connection work in a live state involves danger, it is necessary to turn off a higher-level circuit breaker to keep a power failure state. Further, when measurement becomes unnecessary, it is necessary to remove the measuring instrument and remove it by following the same procedure as attaching the measuring line. This is because a high voltage is applied to the voltage measuring line, and it is dangerous when the measuring instrument is removed.

[0010] It is an object of the present invention to provide an electric measurement line fixture and a power conversion method that can easily measure voltage and power.

[0011]

SUMMARY OF THE INVENTION The present invention relates to an electric measuring wire attachment for performing electric measurement by attaching to an insulated wire having an electric insulating coating provided around a conductive wire, the electric measuring wire attaching device comprising: A connecting member having a tip penetrating into the electrically insulating coating to electrically connect to the conductive wire inside the coated electric wire; and an electrically insulating cover for covering a portion where the connecting member is electrically connected to the conductive wire. One end is connected to the connection member inside the cover, the other end is drawn out of the cover, and the insulated conductive wire covered with the electric insulating coating except for both ends, and the other end of the insulated conductive wire for external connection An electrical measurement device comprising: a terminal; and a terminal case having an electrical insulation property, the terminal being covered with the other end of the insulated conductive wire, and having an opening through which an external connection terminal compatible with the terminal can be inserted. It is a wire attachment.

According to the present invention, an electric measuring wire fixture includes a connecting member, a cover, an insulated conductive wire, a terminal, and a terminal case. The connection member has conductivity, and its tip penetrates into the electrically insulating coating to electrically connect to the conductive wire inside the coated electric wire. The connection member allows direct electrical connection to the covered electric wire. Since the portion where the connection member is electrically connected to the conductive wire is covered with an electrically insulating cover, even when the covered electric wire is in a live state, the electric connection is safely performed via the cover, and the outside of the connection portion is connected to the outside. An electrically insulated state can be maintained. One end of the insulated conductive wire is connected to the connection member inside the cover, and the other end of the insulated conductive wire is drawn out of the cover, and a terminal for external connection is provided. The terminals are covered by an electrically insulating case. Since both ends of the insulated conductive wire are covered with the electric insulating film, even if one end of the insulated conductive wire is connected to the connection member in the cover, the conductive portion is not exposed, so that it can be handled safely. Since the terminal case has an opening through which an external connection terminal compatible with the terminal can be inserted, it can be easily connected to a measuring instrument or the like. When measurement is no longer needed,
It is only necessary to remove the external terminals, and the electrical measurement line fitting can be left as it is.

The present invention is further characterized in that the terminal case further includes a lid capable of opening and closing the opening of the terminal case and having electrical insulation.

According to the present invention, the opening of the terminal case can be opened and closed with the lid having electrical insulation. Once the electrical measurement wire fixture once attached to the insulated wire is left unneeded for measurement, the opening can be closed with a lid, and the internal terminals come into contact with other conductors. In addition to protecting against short circuit and ground faults and preventing electric shock, deterioration of metal parts such as terminals can be prevented.

In the present invention, a plurality of terminals are arranged in the terminal case in a state of being electrically insulated from each other.
Each terminal is connected to a different covered electric wire via the insulated conductive wire and the connection member.

According to the present invention, a plurality of insulated wires are electrically connected to each other via a connecting member, and are drawn out to a plurality of terminals housed in one terminal case, and collectively connected to external connection terminals and the like. Can be connected to For example, when a plurality of voltages need to be measured, for example, when measuring the voltage of a three-phase alternating current, the wiring work for measurement can be easily performed.

Further, the present invention has a case attachable to the terminal case, further comprising a connection terminal having a shape adapted to the terminal in the case, wherein the case is attached to the terminal case when the case is attached to the terminal case. A connector in which a connection terminal is inserted from the opening to enable electrical connection between the terminal and the connection terminal, a tip of the connector is connected to the connection terminal in a case, and the other end is pulled out of the case. And a signal transmission line to be provided.

According to the present invention, when the signal transmission line is connected to the measuring instrument, the connector case provided at the end of the signal transmission line can be mounted on the terminal case, and electric measurement can be easily performed.

Further, the present invention relates to a power conversion method for extracting a power signal from a power supply system in which voltage measurement wiring and current measurement wiring are provided by covered wires and electric measurement is performed. Using one of the electrical measurement line attachments described above, make an electrical connection to the voltage measurement wiring, take out a voltage signal from the terminal of the electrical measurement line attachment or a signal transmission line, and split the voltage into a current measurement wiring. A power conversion method characterized in that a current transformer for measurement is mounted, a current signal is taken out from a secondary side of a split-type current transformer for measurement, and power calculation is performed using a voltage signal and a current signal. is there.

According to the present invention, when it is necessary to further extract a power signal in a power supply system that has already performed electrical measurement, the voltage signal and the current measurement wiring are used to extract the voltage signal. And the current signal respectively,
A power signal can be extracted by a power calculation that converts voltage and current into power. If the voltage of the power supply system is high, the voltage for the voltage measurement is the secondary voltage that is stepped down using an instrument transformer and input to the instrument, and the voltage of the power supply system can be directly input to the instrument If the voltage is within the range, the voltage is the voltage of the power supply system. Since the value of the current flowing through the voltage measurement wiring that is input to the instrument is relatively small, the diameter of the voltage measurement wiring is also relatively small, and even if the electrical insulation coating is included, the electrical connection can be easily made with the connection member of the electrical measurement wire attachment. Connection can be made. The electrical connection operation by the connection member can be performed via an electrically insulating cover. A split-type measuring current transformer is attached to the current measuring wiring, and a current signal is taken out from the secondary side of the measuring current transformer. It is not necessary to interrupt the power supply system or interrupt the existing electrical measurement when installing the electrical measurement line fittings and split-type measuring current transformers, making it easy to extract power signals. become able to.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a schematic configuration of an electric measuring wire fitting 20 according to an embodiment of the present invention. The electric measurement wire attachment 20 of the present embodiment is used for three-phase AC voltage measurement. The electric measurement wire attachment 20 is attached to a covered electric wire provided with an electric insulation covering around a conductive wire to perform electric measurement.
2, 23, insulated conductive wires 24, 25, 26, and female connector portion 27, male connector portion 28, and signal transmission line 29.
And The female connector section 27 and the male connector section 28 are detachable. The female connector 27 has an opening into which at least a part of the male connector 28 can be inserted,
It can be opened and closed with the protective cap 30. Cover 2
Reference numerals 1, 22, and 23 are electrically insulating, and connection members 31, 32, and 33 are provided therein. In the female connector 27, terminals 34, 35,
36 are housed in a state in which they are electrically insulated from each other at intervals. The insulated conductive wires 24, 25, and 26 have one ends of the core wires in the covers 21, 22, and 23, respectively.
2 and 33, the other end of the core wire is
4, 35, and 36, respectively.
Portions between the female connectors 2 and 23 and the female connector 27 are covered with an electric insulating film. In the male connector section 28, connection terminals 37, 38, and 39 connected to the terminals 34, 35, and 36 when mounted on the female connector section 27 are housed in a state of being electrically insulated from each other. I have.

In the female connector portion 27 of the present embodiment, the terminals 34, 35, and 36 are provided for all three phases of the three-phase alternating current. But you can. However, when the three-phase alternating current is to be measured, the three phases can be handled collectively, which facilitates the work and the like.

FIG. 2 shows the covers 21, 22, 2 shown in FIG.
3 shows a configuration related to 3 and connection members 31, 32, 33. In FIG. 2A, each cover 21, 22, 23
Are divided into a connection cover 41 and a holding cover 42 which are connected by a hinge 40 and can be opened and closed. The connection cover 41 and the holding cover 42 are formed of an electrically insulating synthetic resin material or the like, and have a semi-cylindrical shape obtained by cutting a cylindrical shape by a plane including a central axis. At substantially the center of the inner peripheral surface of the connection cover 41, the connection members 31 and 3 shown in FIG.
The metal connection members 43, 2 and 33, are erected. Fasteners 44 and 45 are provided on the sides of the connection cover 41 and the holding cover 42 that are not connected by the hinge 40, respectively. Connection cover 41 and holding cover 42
When they are closed together, they can be fixed with the fasteners 44 and 45. At a substantially central position on the inner peripheral surface of the holding cover 42, a pressure bonding guide 46 is provided.

FIGS. 2 (b) and 2 (c) show a cross section perpendicular to the axis of the insulated wire 47 and a state in which the insulated wire 47 is sandwiched between the connection cover 41 and the holding cover 42 and the electrical connection is being made. Each is shown in a section including the axis. The covered electric wire 47 is formed by covering the periphery of a conductive wire 48 made of metal with an electric insulating cover 49 made of synthetic resin or rubber. The electrical insulation coating 49 has one end in the radial direction at the tip of the connection member 43,
The other is sandwiched between the crimping guides 46. When the connection cover 41 and the holding cover 42 are closed and a force is applied when the connection member 41 is attached to the covered electric wire 47, the connection member 43 is closed.
Of the conductive wire 48 penetrates into the electrically insulating coating 49 and comes into contact with the outer periphery of the conductive wire 48, thereby making an electrical connection. Connection cover 41
On the inner peripheral surface of the holding cover 42, projections 41a and 42a are provided near both ends in the axial direction, respectively, to hold the insulated wire 47 at the center.

FIG. 3 shows a structure related to the attachment and detachment of the female connector portion 27 and the male connector portion 28 of FIG. In the female connector portion 27, terminals 34, 35, and 36 are respectively arranged facing insertion holes 51, 52, and 53 provided in a case 50 formed of an electrically insulating material. Insertion hole 51,
Insertion openings 51a, 52 whose openings 52, 53 are open to the outside
a and 53a can be opened and closed by a protective cap 30 as a lid. The protective cap 30 is hinged on the base end side and the case 5
0, and a fixture 54 is provided on the distal end side. When closing the insertion openings 51 a, 52 a, 53 a with the protective cap 30, the fixing tool 54 can be fitted into the recess 55 provided in the case 50 to fix the protective cap 30.
The recess 55 is provided with the insertion openings 51a, 52a, 53 in the case 50.
Of the side surfaces adjacent to the end surface where “a” is provided, the side surface is located at a position facing the side surface where the protective cap 30 is connected with the hinge and is located near the end surface.

Another recess 56 is formed in the case 50 on a side surface different from the recess 55 and away from the end surface. A claw 58 protruding from the case 57 of the male connector section 28 toward the female connector section 27 is fitted into the recess 56. The case 57 of the male connector section 28 is formed of an electrically insulating material and has an opening 59 into which the entire female connector section 27 can be inserted. In the opening 59, the connection terminal 37,
38 and 39 are arranged in a state in which they are insulated from each other. When the female connector 27 and the male connector 28 are mounted, at least the connection terminals 37, 38, and 39 are inserted into the insertion holes 51, 52, and 53 of the female connector 27, respectively.
Electrical connection is made between the terminals 34, 35, and 36.

The female connector 27 is connected to the male connector 2.
8 when inserted into the opening 59 of the protective cap 30.
Is in close contact with one side of the case 50, which is the rear side in the figure. It is preferable to provide a recess corresponding to the shape of the protective cap 30 on the rear side of the case 50 so that when the protective cap 30 is brought into close contact with the rear side, the protrusion to the outside is reduced.

FIG. 4 shows an example of a partial internal structure of the female connector portion 27 and the male connector portion 28, respectively. FIG.
As shown in (a), one terminal 34 housed in the case 50 of the female connector portion 28 has metal leaf springs 61 and 62 which are arranged to face each other in the insertion hole 51. The other end of the core of the insulated conductive wire 24 is electrically connected to one metal leaf spring 61. As shown in FIG.
The connection terminal 37 of the male connector 28 shown in FIG. The connection terminal 37 is formed of a metal plate. When the connection terminal 37 is inserted between the metal plate springs 61 and 62, electrical connection is made on both sides of the plate surface. Other terminals 35 and 36 and connection terminals 38,
39 has a similar configuration. The claw 58 provided on the case 57 of the male connector portion 28 projects inward from the side of the case 57 and is fitted into the recess 56 on the side surface of the female connector portion 27 shown in FIG. The mounting state of the female connector section 27 and the male connector section 28 can be fixed. Note that a detaching claw 63 is provided on the tip side of the claw 58. The detaching claw 63 is exposed to the outside of the case 50 of the female connector portion 27 when the claw 58 is fitted in the recess 56, and is opened outwardly, so that the claw 58 is opened.
6 to release the fixed state.

FIG. 5 shows a power conversion method as an embodiment performed by using the electric measuring wire fixture 20 of the embodiment shown in FIG. Generally, a power receiving panel 70 or the like provided in an electric power system is provided with a door 71 that can be opened and closed, and a voltage meter 72 and a current meter 7 for displaying voltage / current on the door 71.
3 are installed. These meters do not directly receive the voltage or current to be measured, but generally
The measurement is performed via an instrument transformer called T or a measuring current transformer generally called CT. The secondary voltage of the instrument transformer is normally rated at 110V (or 220V). The secondary current of the measuring current transformer is normally rated at 5A.

When the power system to be measured is a three-phase alternating current, the conductive lines to be measured for voltage and current are R,
There are three phases, S and T. R, S, and T changeover switches 74 and 75 are used to enable three-phase AC voltage and current to be measured by one voltage meter 72 and one current meter 73.
Is provided to enable measurement by switching. The instrument transformer and the measuring current transformer are installed inside the power receiving panel 70, and the secondary-side distribution line is connected via a cable support 76 that stores measurement lines and control lines installed on the door 71, and the like. , R, S,
It is guided to T changeover switches 74 and 75.

In the power conversion method according to the present embodiment, wiring for extracting a power signal can be provided by using the electric measurement line fitting 20 shown in FIG. For the voltage measurement, the covers 21 and 2 are provided in the middle of the wiring connecting the secondary side of the instrument transformer to the voltage meter 72 via the cable support 76.
2 and 23 are mounted, and electrical connection is made inside the cover. The voltage signal is transmitted from the covers 21, 22 and 23 to the insulated conductive wire 2.
4, 25, 26, female connector 27, male connector 28
The signal is input to the voltage input terminal of the power calculation unit 77 via the signal transmission line 29. The current signal is obtained by sandwiching the split-type measuring current transformers 78, 79 having a half-split structure in the middle of the wiring connecting the secondary side of the measuring current transformer to the current meter 73 via the relay terminal plate 76. , Can be taken out from the secondary side of the split-type measuring current transformers 78 and 79.

FIG. 6 shows additional components for performing power conversion in the power receiving panel 70 of FIG. The power calculation unit 77
A voltage signal and a current signal are input into an electrically insulating case, and a power value is calculated and obtained, for example, 4 to 20 mA.
The power calculation circuit that converts the current value into the current value in the range is provided. In the present embodiment, the work of adding such a configuration can be performed easily, safely, and without power interruption without requiring construction or power outage as in the related art.

FIG. 7 schematically shows a power conversion method according to another embodiment of the present invention. In the present embodiment, FIG.
A power conversion function is added in a state where a voltage meter 72 and a current meter 73 are attached to a door 82 of a control panel 81 similar to that described above so that voltage and current can be measured. Parts corresponding to the previously described embodiment are denoted by the same reference numerals,
A duplicate description will be omitted. Inside the control panel 81, a circuit breaker 83 is housed, connected to a power supply side via a power supply side wiring 84, and connected to a load side to which power is to be supplied via a load side wiring 85. In order to enable the voltage to be measured by the voltage meter 72, the load-side connection terminal 86 of the circuit breaker 83
Is connected to one end of a voltage measurement wiring 87, and the other end of the voltage measurement wiring 87 is connected to the primary side of instrument transformers 88 and 89.

The voltage signal for power conversion is supplied to the instrument transformer 8.
The electric measuring wire fixture 20 shown in FIG. 1 is attached to the covered electric wire 47 for making an electrical connection to the voltage meter 72 from the secondary sides of the electric wires 8 and 89, and is taken out. The current signals of the electric measuring wire fixture 20 and the split type measuring transformer are electrically connected to the current meter 73 from the secondary sides of the measuring current transformers 91 and 92 attached to the load side wiring 85 from the circuit breaker 83. The split type measuring current transformers 78 and 79 are attached to the covered electric wire 47 for performing the above-mentioned steps, and are taken out. The power calculation unit 77 is supplied with a voltage signal and a current signal from the electric measurement line fixture 20 and the split-type measurement transformers 78 and 79, respectively, and converts the voltage signal and the current signal into a power amount by a calculation process. The converted electric energy can be used for monitoring a reverse power flow and the like.

When the measurement object is a low-voltage device, the voltage transformers 88 and 89 may not be installed, and the voltage signal may be directly input to the voltage meter 72 or other instruments. In such a case, the covers 31, 32, 33 and the connecting members 34, 3
What is necessary is just to mount | wear with the measurement line fixture including 5 and 36.

FIG. 8 shows the male connector 28 shown in FIG. 1 in each embodiment of the present invention when the measurement line needs to be long.
Is shown attached to the female connector portion 27. When the male connector 28 is not attached to the female connector 27,
Since no voltage is applied to the signal transmission line 29, the operation of removing the insulating coating at the end of the signal transmission line 29 and directly connecting to the voltage input terminal of the power calculation unit 77 can be easily performed. After the signal transmission line 29 is connected to the power calculation section 77, the male connector section 28 is connected to the female connector section 27, so that the power calculation section 77, the covers 21, 22, 23 and the connection members 31, 32, 33 Can be easily connected without interruption.

FIG. 9 shows a state immediately before the male connector 28 is connected to the female connector 27 or immediately after the connection is released, as shown in FIG. As shown in FIG. 3, in the male connector portion 27, the insertion holes 51 of the insertion holes 51, 52, 53 are provided.
Since the openings a, 52a, and 53a are open, if the openings are closed by the protective cap 30, the risk of short-circuiting, electric shock, or the like can be extremely reduced.

FIG. 10 shows a state in which the female connector section 27 is directly mounted on the power calculation section 77 in each embodiment of the present invention. The voltage input section of the power calculation section 77 is connected to the female connector section 27.
If the shape is adapted to the above, the female connector 27 can be directly connected to input a voltage signal.

FIG. 11 shows a simplified state of the electrical measurement line fixture 20 in a state where it is not connected to the power calculation unit 77 shown in FIG. By covering the opening of the female connector portion 27 with the protective cap 30, the same effect as in FIG. 9 can be obtained.

FIG. 12 shows a basic configuration for power conversion. In the power calculation unit 77, a built-in power calculation electronic circuit performs a calculation process between the voltage signal and the current signal to generate a signal representing the amount of power. The current signal is obtained from the secondary side of the split-type instrument current transformers 78 and 79. The voltage signal is obtained via the electrical measurement line fitting 20. Split-type instrument current transformers 78 and 79 and electrical measurement line fixture 20
Can be easily and safely attached to the insulated wire 47 to be measured. Even after the measurement is completed, the portions from the female connector portion 27 to the covers 31, 32, and 33 are left to facilitate the next connection.

[0041]

As described above, according to the present invention, when making a direct electrical connection to the covered electric wire by the connecting member, the work can be performed while being covered with the electrically insulating cover. Even when the covered electric wire is in a live state, the electric connection can be safely performed. When measurement is no longer necessary, the external terminals connected to the terminals in the terminal case need only be removed, and the electrical measurement line fixture can be left as it is.

Further, according to the present invention, since the opening of the terminal case can be closed with the lid having an electrical insulation property, a short circuit or a ground fault accident due to the contact of the internal terminals with other conductors can be prevented. In addition to protection and prevention of electric shock, deterioration of metal parts such as terminals can be prevented.

Further, according to the present invention, the work for electrical measurement of a plurality of covered electric wires can be performed efficiently and easily.

According to the present invention, if the signal transmission line is connected to the measuring instrument, the connector case provided at the end of the signal transmission line can be attached to the terminal case, and the electrical measurement can be performed safely and easily. . When the measurement is no longer necessary, the connector can be detached from the terminal, and the connection member or the terminal can be left in a state where the possibility of short circuit or electric shock is extremely low, until the next measurement.

Further, according to the present invention, a voltage signal and a current signal are respectively taken out by using the existing voltage measurement wiring and current measurement wiring, and a power signal is taken out by a power calculation for converting the voltage and current into power. be able to. The electrical connection operation by the connection member can be performed via the electrically insulating cover, and the position for extracting the voltage signal can be freely determined. The extraction of a current signal can also be performed in an electrically insulated state by mounting a split-type measuring current transformer. It is not necessary to interrupt the power supply system or interrupt the existing electrical measurement when installing the electrical measurement line fittings and split-type measuring current transformers, making it easy to extract power signals. become able to.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a schematic configuration of an electric measuring wire attachment 20 according to an embodiment of the present invention.

FIG. 2 is a perspective view and a sectional view showing a configuration related to covers 21, 32, 23 and connecting members 31, 32, 33 of FIG.

3 is a female connector section 27 and a male connector section 2 of FIG.
It is a perspective view which shows the partial structure of No. 8.

4 is a female connector section 27 and a male connector section 2 of FIG.
8 is a sectional view showing a partial configuration of FIG.

FIG. 5 is a simplified perspective view showing a configuration of a power receiving panel 70 to which a configuration for performing power conversion using the electric measurement line fitting 20 of FIG. 1 is added.

FIG. 6 is a simplified perspective view showing a configuration for performing power conversion added to FIG. 5;

FIG. 7 is a simplified perspective view showing a configuration of a control panel 81 to which a configuration for performing power conversion using the electrical measurement line fixture 20 of FIG. 1 is added.

FIG. 8 is a simplified block diagram showing a configuration of the electric measurement wire attachment 20 of FIG.

9 is a simplified block diagram showing a state where the female connector portion 27 and the male connector portion 28 are removed in FIG.

FIG. 10 is a simplified block diagram showing a state in which the female connector portion 27 of the electrical measuring wire attachment 20 of FIG.

FIG. 11 is a simplified block diagram showing a state where the female connector portion 27 and the male connector portion 28 are removed in FIG.

FIG. 12 is a block diagram showing a basic configuration for performing power conversion using the electric measurement line fitting 20 of FIG.

FIG. 13 is a perspective view showing an outline of a conventional power measuring method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 20 Electric measurement wire fixture 21, 22, 23 Cover 24, 25, 26 Insulated conductive wire 27 Female connector part 28 Male connector part 29 Signal transmission line 30 Protective cap 31, 32, 33, 43 Connection member 34, 35, 36 Terminal 37, 38, 39 connection terminal 41 connection cover 42 holding cover 47 covered electric wire 48 conductive wire 49 electric insulation coating 50, 57 case 51, 52, 53 insertion hole 51a, 52a, 53a insertion opening 59 opening 70 power receiving board 72 voltage meter 73 Current meter 77 Power calculation unit 78, 79 Split type current transformer for instrument 81 Control board 85 Load side wiring 87 Voltage measurement wiring 88, 89 Instrument transformer 91, 92 Instrument current transformer

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2G035 AA10 AB05 AD19 5E012 AA22 AA41 AA43 5E087 EE01 EE11 FF14 LL04 LL17 LL23 LL29 LL33 MM06 QQ06 RR17 RR18 RR25

Claims (5)

[Claims] 1. An electric measuring wire attachment for mounting on an insulated wire provided with an electric insulating coating around a conductive wire, the electric measuring wire attaching device having a conductive property and having an end electrically insulating coated. A connection member that penetrates into the inside and is electrically connected to the conductive wire inside the insulated wire; an electrically insulating cover that covers a portion where the connection member is electrically connected to the conductive wire; one end connected in the cover An insulated conductive wire that is connected to the member, the other end of which is pulled out of the cover and is covered with an electrical insulating coating except for both ends; an external connection terminal provided at the other end of the insulated conductive wire; A terminal case having an opening through which a terminal is covered with the other end of the insulated conductive wire and an external connection terminal adapted to the terminal is insertable. 2. An opening portion of the terminal case can be opened and closed,
2. The electrical measuring wire attachment according to claim 1, further comprising a lid having electrical insulation. 3. A plurality of terminals are arranged in the terminal case in a state where they are electrically insulated from each other, and each terminal is connected to a different covered electric wire via the insulated conductive wire and the connection member. The electrical measuring wire attachment according to claim 1 or 2, wherein: 4. A terminal having a case attachable to the terminal case, a connection terminal having a shape adapted to the terminal in the case, and the connection terminal being attached to the terminal case when the case is attached to the terminal case. A connector capable of being electrically connected between the terminal and the connection terminal by being inserted from the opening, and a tip connected to the connection terminal in a case of the connector;
The electrical measurement line attachment according to any one of claims 1 to 3, further comprising a signal transmission line whose other end is drawn out of the case. 5. A power conversion method for providing a voltage measurement wiring and a current measurement wiring with a covered electric wire, and extracting a power signal from a power supply system for performing electrical measurement, wherein: Electrical connection to the voltage measurement wiring is performed using the electrical measurement wire attachment according to any of the above, a voltage signal is extracted from the terminal of the electrical measurement wire attachment or the signal transmission line, and divided into current measurement wires. A power conversion method characterized in that a current transformer of a split type is mounted, a current signal is taken out from a secondary side of the current transformer of a split type, and power calculation is performed using the voltage signal and the current signal. .