JP2017015538A - Voltage measuring instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a voltage measuring instrument that allows a worker to simply measure the voltage of an electric wire even at a site where the fire of a solar panel is extinguished.SOLUTION: A first action piece 10 and a second action piece 20 are rotatably connected with each other by a support shaft connecting a part between a first jaw part 11 and a first handle part 12 and a part between a second jaw part 21 and a second handle part 22. By using a voltage measuring instrument provided with a needle-like measuring terminal 13 on the first jaw part 11 toward the second jaw part 21, an electric wire is interposed between the first jaw part 11 and the second jaw part 21, and the needle-like measuring terminal 13 is cut into the coating of the electric wire to make it contact with the conductor of the wire, and electric wire voltage is measured.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a voltage measuring device for confirming that power generation of a solar panel is stopped when extinguishing a fire of the solar panel, for example.

In a general residential solar power generation system, a solar panel composed of solar cell modules connected in series and parallel is installed on the roof of a house (in this application, a solar cell array is referred to as a “solar panel”). Has been. And the output from a solar panel is connected to the power conditioner via the relay terminal box, and is comprised so that electric power can be obtained by alternating current (for example, refer patent document 1).
While such a solar power generation system is widespread, a fire caused by the solar power generation system has become a problem. Since the solar panel always generates power when it is irradiated with light, a failure in the solar panel may generate heat and cause a fire.

This solar panel fire is a kind of electric fire, and it is required to turn off the power for safety when extinguishing. Therefore, before fire extinguishing work, it is necessary to confirm that there is no voltage on the wires such as the output wire of the solar panel and the output wire of the relay terminal box. To measure the voltage, remove the sheath of the output wire and connect the lead wire. Had to be exposed. It is difficult to carry out such work at an emergency fire extinguishing site.
As a device for measuring the voltage of an electric wire without removing the coating, there is a voltage measuring device of Patent Document 2.

JP 2013-110290 A JP 2008-039421 A

However, the voltage measuring device of Patent Document 2 rotates a ball screw, and is still inconvenient for use in a fire extinguishing site.
The present invention has been made to solve such problems, and it is intended to obtain a voltage measuring device that allows an operator to easily measure the voltage of an electric wire even in a fire extinguishing site of a solar panel fire. Objective.

(1) The present invention has a first action piece comprising a first jaw and a first handle, and a second action piece comprising a second jaw and a second handle, the first jaw The first action piece and the second action piece are pivotally connected to each other by a support shaft that connects between the first handle part and the second jaw part and the second handle part. The first jaw portion is provided with a needle-like measurement terminal toward the second jaw portion, the second jaw portion is provided with a holding recess toward the first jaw portion, and the first jaw portion and the second jaw portion are provided. It is a voltage measuring device that causes the needle-like measurement terminal to bite into the coating of the electric wire and to contact the conductor of the electric wire by sandwiching the electric wire between the jaws.
(2) Moreover, this invention is an apparatus for voltage measurement of (1) which provided the said acicular measurement terminal with two or more.
(3) Moreover, this invention is an apparatus for a voltage measurement of (2) which has a display part which displays conduction | electrical_connection between the said some acicular measuring terminals.
(4) In addition, the present invention provides the voltage measurement device according to (2) having a measurement line derived from the needle-like measurement terminal so that each of the plurality of needle-like measurement terminals can be connected to the outside. It is.
(5) Further, the present invention is the voltage measuring device according to any one of (1) to (4), wherein the first jaw and the second jaw can be closed by a fixing mechanism.
(6) In the present invention, the fixing mechanism may have a stopper on one of the first action piece or the second action piece, and the stopper on the other of the first action piece or the second action piece. The device for voltage measurement according to (5), wherein the first jaw and the second jaw can be fixed in a closed state by being hooked.
(7) Moreover, this invention is an apparatus for voltage measurement in any one of (1) thru | or (6) which used the surface of the said 1st action piece and the said 2nd action piece as a non-conduction member.

According to the configuration of the first aspect of the present invention, an operator simply places the electric wire between the first jaw and the second jaw and holds the first handle and the second handle with one hand. The terminal can be cut into the sheath of the electric wire and brought into contact with the conductor, and the operator can easily measure the voltage of the electric wire even in a fire extinguishing site of a solar panel fire.
Moreover, according to the structure of Claim 2 of this invention, the voltage of conducting wire can be caught reliably by providing a plurality of needle-shaped measurement terminals.
According to the configuration of claim 3 of the present invention, an operator can confirm that the needle-like measurement terminal is in contact with the conductor by providing the display unit that displays the conduction between the plurality of needle-like measurement terminals. Can be confirmed.
According to the configuration of claim 4 of the present invention, by providing a measurement line derived from the needle-like measurement terminal so that each of the plurality of needle-like measurement terminals can be connected to the outside, Even without providing a display unit on the device, the operator can measure the continuity between the measurement lines and confirm that the needle-like measurement terminal is in contact with the lead.
Moreover, according to the structure of Claim 5 of this invention, by providing a fixing mechanism, it can fix after making a needle-shaped measuring terminal bite into an electric wire. Therefore, it is not necessary for the operator to hold the voltage measuring instrument, and operations such as setting the voltmeter can be performed.
According to the sixth aspect of the present invention, the fixing mechanism has the stopper on one of the first action piece or the second action piece, and the stopper is hooked on the other of the first action piece or the second action piece. By doing so, a simple structure fixing mechanism can be realized.
Moreover, according to the structure of Claim 7 of this invention, since the surface of the apparatus for voltage measurement is formed with the nonelectroconductive member, there is no danger, such as an electric shock.

Configuration of a photovoltaic power generation system in which the present invention is used. 1 shows a voltage measuring device 1 according to a first embodiment. The enlarged view of the 1st jaw part 11 vicinity in the apparatus 1 for voltage measurement which concerns on Example 1. FIG. Voltage measuring device 1 according to Example 1 in a closed state. Voltage measuring device 2 according to Embodiment 2 of the present invention. The enlarged view of the 1st jaw part 11 vicinity in the apparatus 2 for voltage measurement which concerns on Example 2. FIG.

Hereinafter, preferred embodiments of voltage measuring devices 1 and 2 as an example of the voltage measuring device of the present invention will be described with reference to the drawings.
First, the solar power generation system 50 in which the present invention is used will be described below.
FIG. 1 is a configuration diagram of a photovoltaic power generation system 50 in which the present invention is used.
The solar power generation system 50 includes a solar panel 51, a connection box 53, a power conditioner 55, a distribution board 57, and a power sale meter 58.

  The solar panel 51 converts light energy from the sun into electric power and outputs it as DC power. The two solar panels 51 shown in FIG. 1 are connected to the connection box 53 via the respective input electric wires 52 and output the generated electric power.

  The connection box 53 collects DC power generated by the solar panel 51. That is, when a plurality of solar panels 51 are installed as shown in FIG. 1, the power from each solar panel 51 is collected. The connection box 53 is connected to the power conditioner 55 via the output electric wire 54 and outputs the collected DC power to the power conditioner 55.

  The power conditioner 55 is a power conversion device that converts input DC power into AC power, and outputs power stably in response to the amount of power generated by the solar panel 51 that changes depending on time and weather. is there. And it connects to the distribution board 57 installed indoors via the connection line 56. FIG.

  The distribution board 57 is a device that transmits the electric power converted into alternating current by the power conditioner 55 so that it can be used in the home. Moreover, in the photovoltaic power generation system 50 in which a power trading system is introduced, the distribution board 57 sends power to the home when the power in the home is insufficient, and the power in the home is sufficient. When power is supplied, power is sent to the power company via the power sale meter 58.

When a fire occurs in the solar panel 51, a voltage is not output from the solar panel 51 by various methods so as not to hinder fire extinguishing work. However, in order to confirm whether or not the voltage is actually output, it is necessary to measure the voltage of the output wire 54. And when the voltage is not output, the fire extinguishing work is started. On the other hand, when voltage is generated, in order not to output the voltage from the solar panel 51 so as not to hinder the fire fighting work, the voltage is measured for each of the input electric wires 52 to determine which It is necessary to find out whether a voltage is generated from the solar panel 51.
In this measurement, the electric wire voltage is obtained with the voltage measuring device of the present invention, and the voltage is measured with a voltmeter.

  FIG. 2 shows a voltage measuring device 1 that is an example of a voltage measuring device according to the first embodiment of the present invention. Reference numeral 10 denotes a first action piece, which has a first jaw portion 11 and a first handle portion 12. Reference numeral 20 denotes a second working piece, which has a second jaw portion 21 and a second handle portion 22. Reference numeral 30 denotes a support shaft between the first jaw portion 11 and the first handle portion 12, which is an intersection of the first action piece 10 and the second action piece 20, and the second jaw portion 21 and the second handle portion 22. The first action piece 10 and the second action piece 20 are rotatable with respect to each other. Reference numeral 13 denotes a metallic needle-like measurement terminal, which is provided on the first jaw portion 11 with its tip directed toward the second jaw portion 21. Reference numeral 14 denotes a measurement line, one end of which is connected to the needle-like measurement terminal 13 and the other end is connected to a voltmeter (not shown). A holding member 15 having a concave portion from the lower side to the center is fitted into the first jaw portion 11, and the needle-like measurement terminal 13 and the measurement line 14 are fixed to the first jaw portion 11. Reference numeral 23 denotes a holding recess, which is provided on the second jaw 21 toward the first jaw 11 and holds the electric wire when the voltage measuring device 1 is closed. Reference numeral 24 denotes a stopper hooking portion, and 25 denotes a stopper, which forms a fixing mechanism. Although the 1st action piece 10 and the 2nd action piece 20 are formed with the insulating resin which is a non-conduction member, only the surface may be formed with the insulating resin and the metal may be embed | buried inside. The stopper 25 is preferably made of an insulating resin, a rubber ring, or the like, but may be made of other materials.

  FIG. 3 is an enlarged view of the vicinity of the first jaw 11 in the voltage measuring device 1 according to the first embodiment. 3A is a view of FIG. 2 as viewed from above, and FIG. 3B is a view of the view as viewed from the side. 3 indicated by dotted lines in FIGS. 3A and 3B are electric wires such as the output electric wire 54 and the input electric wire 52 to be measured. As shown in FIG. 3A, in the first embodiment, the needle-like measurement terminal 13 protrudes at a position in the center in the width direction of the first jaw portion 11 and corresponding to the center portion of the holding member 15. Further, the holding member 15 is connected to the first jaw 11 from below the first jaw 11 and from the outside in the width direction. The holding member 15 is also formed of an insulating resin.

  FIG. 2 shows the voltage measuring device 1 according to the first embodiment in the closed state, while FIG. 4 shows the voltage measuring device 1 in the opened state. In FIG. 4, the electric wire 40 is not shown. When the voltage measuring device 1 is used, the electric wire 40 is sandwiched between the needle-like measurement terminal 13 and the holding recess 23 in the state shown in FIG. 2, and the first handle 12 and the second handle 22 are gripped. Close like 4. If it does so, the 1st jaw part 11 and the 2nd jaw part 21 will close, and the needle-shaped measurement terminal 13 will bite into the coating | cover of the electric wire 40 as shown in FIG.3 (b), and will contact the conducting wire in coating | cover. When the voltage measuring device 1 is closed by grasping the first handle portion 12 and the second handle portion 22, the stopper 25 is turned outside the first handle portion 12 as shown in FIG. 4 and fixed in the closed state. can do. Thus, the operator can set and operate the voltmeter and the like by separating the voltage measuring device 1 from his hand.

The stopper hooking portion 24 of the first embodiment is provided on the second action piece 20, but may be provided on the first action piece 10. A stopper latching portion 24 and a stopper 25 as a fixing mechanism are provided on one of the first action piece 10 and the second action piece 20, and the stopper 25 is hooked on the other of the first action piece 10 or the second action piece 20. Therefore, it is only necessary that the first jaw portion 11 and the second jaw portion 21 can be fixed in a closed state. As a fixing mechanism, the stopper hooking portion 24 is provided at the end of the second handle portion 22 and the stopper 25 is hooked. However, a fixing mechanism such as a ratchet mechanism may be provided in the portion of the support shaft 30.
The fixing mechanism is not limited to the one described above, and any structure may be used as long as the first jaw portion 11 and the second jaw portion 21 are fixed.

  In the first embodiment, one needle-like measurement terminal 13 that is designed to be sufficiently large is provided. The needle-shaped measurement terminal 13 is deeply cut into the coating of the electric wire 40, and thus contacts the conductor in the coating. In Example 2, a voltage measuring device 2 that makes it possible to further ensure contact with a conductive wire will be described. FIG. 5 is a voltage measuring device 2 according to the second embodiment of the present invention, and FIG. 6 is an enlarged view of the vicinity of the first jaw 11 in the voltage measuring device 2 according to the second embodiment. 6A is a view of FIG. 5 as viewed from above, and FIG. 6B is a view of the view as viewed from the side. In FIG. 6A and FIG. 6B, the electric wire 40 is not shown. In Example 2, two needle-like measurement terminals 13 are provided side by side. Reference numeral 16 denotes an LED, which is provided on a side portion of the holding member 15 and functions as a display unit. The LED 16 is lit to indicate continuity when the two needle-like measurement terminals 13 are conductive. The operator can confirm that the needle-like measurement terminal 13 has contacted the conducting wire in the electric wire 40 by turning on the LED 16 with the electric wire 40 sandwiched between the voltage measuring devices 2. If one of the needle-like measurement terminals 13 is not in contact with the conducting wire, the LED 16 is not lit, so that the operator can recognize that the contact of the needle-like measuring terminal 13 with the conducting wire is insufficient. Then, the needle-like measurement terminal 13 can be reliably brought into contact with the conductor in the electric wire 40 by changing the position of the electric wire 40 sandwiched between the voltage measuring devices 2 until the LED 16 is turned on.

In the second embodiment, the LED 16 can confirm contact with the lead wire. However, a measurement line 14 derived from each of the plurality of needle-like measurement terminals 13 is provided, and a resistance measurement device, a continuity test device, and the like provided outside are provided. It may be possible to connect to. Further, as shown in FIG. 6A, the contact with the conductor can be further ensured by simply providing a plurality of needle-like measurement terminals 13 as compared with the voltage measuring device 1 of the first embodiment. Therefore, a plurality of needle-like measurement terminals 13 may be used without providing the LEDs 16.
In Example 1 and Example 2 of the present invention, it has been described that the voltage measuring devices 1 and 2 are used to confirm the presence or absence of power generation of the solar panel 51 before extinguishing the fire. Sometimes used. Under normal conditions, the voltage can be measured by using a tester in the display of the power conditioner 55 or in the connection box 53. However, after the fire is extinguished, the power conditioner 55 and the connection box 53 are damaged. there is a possibility. In such a case, the voltage of the photovoltaic power generation system 50 (electric wire 40) can be measured by using the voltage measuring devices 1 and 2 of the present invention.

1, 2 Voltage measuring device, 10 First action piece, 11 First jaw, 12 First handle, 13 Needle-shaped measurement terminal, 14 Measurement line, 15 Holding member, 16 LED, 20 Second action piece, 21 Second jaw, 22 Second handle, 23 Holding recess, 24 Stopper latch, 25 Stopper, 30 Spindle, 40 Electric wire, 50 Solar power generation system, 51 Solar panel, 52 Input wire, 53 Junction box , 54 Output wire, 55 Power conditioner, 56 Connection line, 57 Distribution board, 58 Power meter

Claims (7)

A first action piece comprising a first jaw and a first handle;
A second action piece comprising a second jaw and a second handle;
Have
The first action piece and the second action piece are rotated around each other by a support shaft that connects between the first jaw part and the first handle part and between the second jaw part and the second handle part. Connect freely,
The first jaw is provided with a needle-like measurement terminal toward the second jaw,
The second jaw is provided with a holding recess toward the first jaw,
A voltage measuring device that causes the needle-like measurement terminal to bite into the sheath of the electric wire and to contact the conductor of the electric wire by sandwiching the electric wire between the first jaw and the second jaw. The voltage measuring device according to claim 1, wherein a plurality of the needle-like measurement terminals are provided. The voltage measuring device according to claim 2, further comprising a display unit that displays conduction between the plurality of needle-like measurement terminals. The voltage measuring device according to claim 2, further comprising a measurement line derived from the needle-like measurement terminal so that each of the plurality of needle-like measurement terminals can be connected to the outside. The voltage measuring device according to any one of claims 1 to 4, wherein the first jaw portion and the second jaw portion can be fixed in a closed state by a fixing mechanism. The fixing mechanism has a stopper on one of the first action piece or the second action piece, and the first mechanism piece or the second action piece is hooked on the other end of the first action piece or the second action piece. The voltage measuring device according to claim 5, wherein the jaw and the second jaw can be fixed in a closed state. The voltage measuring device according to claim 1, wherein surfaces of the first action piece and the second action piece are non-conductive members.

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