JP2010175412A - Voltage measuring apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a voltage measuring apparatus easy to handle and to measure a voltage between measuring target objects separated from each other by a long distance. <P>SOLUTION: This voltage measuring apparatus is constituted so as to measure a line voltage Vd (a measuring target voltage) between covered electric wires 100a, 100b (a pair of measuring target objects). The voltage measuring apparatus includes a first measuring unit 2a for measuring a first voltage between the covered electric wire 100a and a reference potential in non-contact with the covered electric wire 100a and a second measuring unit 2b for measuring a second voltage between the covered electric wire 100b and a reference potential in non-contact with the covered electric wire 100b. The measuring unit 2a includes a communication section 7a (a first wireless communication section) for transmitting voltage data Dva of the measured first voltage to the measuring unit 2b. The measuring unit 2b includes a communication section 7b (a second wireless communication section) for receiving the voltage data Dva and a control section 10b (a computing section) for computing a differential voltage of the first voltage specified on the basis of the second voltage and the voltage data Dva as a line voltage Vd. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a voltage measuring device that measures a voltage to be measured between a pair of measuring objects in a non-contact manner on each measuring object.

  For example, registered utility model No. 3005579 discloses a voltage detector configured to be able to measure a voltage in a contactless manner with respect to a measurement object. In this case, with this type of voltage detector, the reference potential is connected to the ground via the body case of the voltage detector, utilizing the fact that the body of the measurer (the hand holding the voltage detector) is almost the same potential as the ground. In this state, a configuration for measuring the ground voltage between the measurement object and the ground is employed. Therefore, this type of voltage detector is easy to handle as much as an earth wire or the like is unnecessary, but has a drawback that it cannot measure a voltage other than the ground voltage.

  On the other hand, JP 2002-55126 A discloses a non-contact voltmeter configured to be able to measure a line voltage between two electric wires. In this case, the non-contact voltmeter disclosed in another embodiment of the publication includes a pair of measuring means, and each measuring means is electrically connected to the computing means via the amplifying means and the noise removing means. Has been. In addition, this non-contact voltmeter includes a conductor (detection electrode) disposed around the wire covering of the two electric wires and connected to each measuring means via a signal cable. The current flowing in the current path between each conductor and ground is measured based on the electrostatic capacitance between the body and the conductive wire of each wire. Each amplifying unit amplifies a signal corresponding to the measured current value, and each noise removing unit removes a noise component in each amplified signal. Further, the computing means computes the voltage between the two electric wires by computing the signal after noise removal (signal corresponding to the current value measured by each measuring means). As a result, a voltage other than the ground voltage (in this example, a line voltage) is measured.

Registered Utility Model No. 3005579 (Page 2-5, Figure 1) JP 2002-55126 A (page 4-5, FIG. 5)

  However, the conventional non-contact voltmeter has the following problems. That is, the conventional non-contact voltmeter includes a pair of measuring means and a conductor (detection electrode) connected to each measuring means via a signal cable to measure the line voltage without contact with the electric wire. The structure to be adopted is adopted. In this case, when using this type of non-contact voltmeter, a pair of measurement objects (in the above example, two electric wires) for measuring voltage are not necessarily located at a short distance. The bodies may be greatly separated from each other. However, in this type of non-contact voltmeter, in general, the length of the signal cable connecting the detection electrode and the measurement unit is in the range of about several tens of cm to 2 m. For this reason, even if the two signal cables are pulled out in opposite directions with respect to the main body of the voltmeter, both detection electrodes can be separated by only a few meters, and the conventional non-contact voltmeter There is a problem that it is impossible to measure a voltage between measurement objects that are greatly separated from each other.

  In this case, it is possible to measure the voltage even for the measurement object separated to some extent by sufficiently lengthening the signal cable connecting the detection electrode and the measuring means. However, when a configuration in which the detection electrode and the measuring means are connected using a long signal cable is adopted, the long signal cable is not only in the way when carrying the voltmeter, but is located at a very short distance. Even when measuring the voltage between the measurement objects, an unnecessarily long signal cable interferes with the measurement work. In addition, when the voltmeter is cleared after the measurement operation is completed, the two long signal cables may be entangled with each other, and the next measurement process may require a complicated operation of untangling the entangled signal cables. Therefore, when the configuration in which the detection electrode and the measuring means are connected by a long signal cable is adopted, it is possible to measure the voltage between the measurement objects that are largely separated, but the voltmeter is not handled. The problem of becoming very complicated arises.

  The present invention has been made in view of such problems, and is intended to provide a non-contact type voltage measuring apparatus that is easy to handle and that can measure a voltage between measurement objects that are largely separated from each other. Objective.

  In order to achieve the above object, the voltage measuring apparatus according to claim 1 is a voltage measuring apparatus for measuring a measuring object voltage between a pair of measuring objects, and between one of the measuring objects and a reference potential. A first measurement unit that measures the first voltage of the first measurement object without contact with the one measurement object, and a second voltage between the other of the measurement objects and a reference potential. A first wireless unit that includes a second measurement unit that performs measurement in a non-contact manner with respect to the object, and the first measurement unit transmits voltage data of the measured first voltage to the second measurement unit; A second wireless communication unit configured to receive the voltage data; the second voltage; and a differential voltage of the first voltage specified based on the voltage data. And a calculation unit for calculating as a voltage to be measured It is provided.

  The voltage measuring device according to claim 2 is the voltage measuring device according to claim 1, wherein the voltage measuring device includes a plurality of the first measurement units, and the calculation unit includes the second voltage and each of the first measurements. A plurality of measurement target voltages are calculated based on the plurality of first voltages measured by the unit and transmitted from the first measurement units as the voltage data.

  The voltage measuring device according to claim 3 is the voltage measuring device according to claim 1 or 2, wherein the second measuring unit includes a display unit for displaying the voltage to be measured.

  According to a fourth aspect of the present invention, there is provided the voltage measuring device according to the third aspect, wherein the display unit is capable of displaying the magnitude of the voltage to be measured in a bar graph.

  The voltage measuring device according to claim 5 is the voltage measuring device according to any one of claims 1 to 4, wherein the second measuring unit instructs the measurement of the voltage to be measured. It has.

  The voltage measuring device according to claim 6 is the voltage measuring device according to any one of claims 1 to 5, comprising voltage detection electrodes respectively housed in tip portions of the measurement units, wherein the tip The contact surface that is in contact with the electric wire as the measurement object is formed into a curved surface that is concavely curved.

  The voltage measuring device according to claim 7 is the voltage measuring device according to any one of claims 1 to 6, wherein the voltage measuring device is disposed in at least one of the measurement units and illuminates the front of the measurement unit. Department.

  The voltage measurement device according to claim 8 is the voltage measurement device according to any one of claims 1 to 7, further comprising a collar portion attached to a distal end portion of a grip portion that grips each measurement unit. .

  The voltage measuring device according to claim 9 is the voltage measuring device according to any one of claims 1 to 8, further comprising a sound generation unit that generates a sound in a manner in which the magnitude of the voltage to be measured can be identified. Yes.

  In addition, the voltage measuring device according to claim 10 notifies the fact when the voltage measuring device according to any one of claims 1 to 9 can measure the voltage to be measured with a predetermined accuracy. An informing unit is provided.

  According to the voltage measurement device of claim 1, the first measurement unit is configured by including the first wireless communication unit that transmits the voltage data of the measured first voltage to the second measurement unit, and the voltage A second measurement unit comprising: a second wireless communication unit that receives data; and a calculation unit that calculates a second voltage and a differential voltage of the first voltage specified based on the voltage data as a measurement target voltage. Unlike the conventional non-contact voltmeter in which the detection electrode is connected to each measuring means via a signal cable, even if a pair of measurement objects are separated greatly, If the communication unit is within a distance range in which wireless communication is possible, the voltage to be measured can be reliably measured. In addition, since an unnecessarily long signal cable is not required, the voltage measuring device can be handled sufficiently easily.

  According to the voltage measuring device of claim 2, the first measuring unit is provided in plural, and the calculation unit in the second measuring unit is measured by the second voltage and each first measuring unit. By adopting a configuration in which a plurality of measurement target voltages are sequentially calculated based on a plurality of first voltages transmitted as voltage data from the first measurement unit, a plurality of measurement target voltages can be easily measured. it can.

  According to the voltage measuring device of the third aspect, the display unit for displaying the voltage to be measured is arranged in the second measuring unit, so that the first measuring unit and the second measuring unit are separately provided. Unlike the configuration in which a display device (display unit) for displaying the voltage to be measured is provided, a series of processes from the measurement operation of the voltage to be measured to the display of the voltage to be measured are completed while only having both measurement units. be able to. Further, when a display device is provided separately from both measurement units, or when a display unit is provided in the first measurement unit, the value of the voltage to be measured calculated by the calculation unit is displayed from the second measurement unit. Alternatively, it is necessary to transmit to the first measurement unit. According to this voltage measurement device, the value of the voltage to be measured calculated by the calculation unit can be immediately displayed on the display unit in the second measurement unit. Therefore, the voltage to be measured can be displayed quickly without consuming unnecessary power for transmitting the measurement result.

  In addition, according to the voltage measuring apparatus of the fourth aspect, by configuring the display unit so that the magnitude of the voltage to be measured can be displayed in a bar graph, the value of the voltage to be measured can be intuitively recognized by the bar graph. Can do.

  According to the voltage measuring apparatus of the fifth aspect, the measurement operation unit for instructing the measurement of the voltage to be measured is arranged in the second measurement unit, so that the first measurement unit and the second measurement unit are provided. Unlike the configuration in which the measurement operation unit is provided in a device separate from the unit, the measurement processing of the voltage to be measured can be started with only both measurement units. Unlike the configuration in which the measurement operation unit is provided in a device separate from the first measurement unit and the second measurement unit, and the configuration in which the measurement operation unit is provided in the first measurement unit, the operation signal of the measurement operation unit is received. The time required from the operation of the measurement operation unit to the calculation of the measurement target voltage by the calculation unit can be sufficiently shortened by the amount that the processing to be transmitted to the second measurement unit is unnecessary.

  According to the voltage measuring device of the sixth aspect, the contact surface of the tip portion of each measurement unit is formed into a curved surface that is curved in a concave shape, so that the two electric wires as a pair of measurement objects are obtained. When measuring the line voltage as the voltage to be measured, the entire contact area or almost the entire area and the outer peripheral surface of the electric wire can be brought into contact with each other, thereby preventing misalignment between the tip and the electric wire. be able to.

  Moreover, according to the voltage measuring apparatus of Claim 7, when the illumination part was arrange | positioned in at least one of each measurement unit, for example, when a measurement object exists in the shade, or the illumination intensity of a measurement field is low Even so, since the front of the tip of the measurement unit, that is, the measurement object can be illuminated, the measurement operation can be performed safely and easily.

  Further, according to the voltage measurement device of claim 8, the measurement site where the high voltage line is disposed in the vicinity of the measurement object, for example, by attaching the collar portion to the tip portion of the grip portion in each measurement unit. In this case, even if the hand holding the measurement unit slips during measurement, it is possible to reliably prevent the hand from coming into contact with the high-voltage line.

  In addition, according to the voltage measuring device of claim 9, by providing a sound generation unit that generates sound in a manner capable of identifying the magnitude of the voltage to be measured, for example, the electric wire exists in a narrow place, Even when there is an obstacle in the vicinity of the measurement object and it is difficult to visually recognize the display unit, the value of the measurement object voltage can be reliably recognized.

  In addition, according to the voltage measuring device of the tenth aspect, since the notifying unit that notifies the fact when the measurement target voltage can be measured with the predetermined accuracy is provided, the measurement target voltage can be more accurately measured. Measurements can be made.

1 is a block diagram showing a configuration of a line voltage measuring device 1. FIG. 1 is an external perspective view of a line voltage measuring device 1. FIG. 2 is an external perspective view of a measurement unit 52. FIG. It is an external appearance perspective view of the measurement unit 2 of the state which attached the collar part 71b. It is the 1st explanatory view for explaining the display mode of the value of line voltage Vd. It is the 2nd explanatory view for explaining the display mode of the value of line voltage Vd. It is the 3rd explanatory view for explaining the display mode of the value of line voltage Vd.

  Embodiments of a voltage measuring apparatus according to the present invention will be described below with reference to the accompanying drawings.

  First, the configuration of the line voltage measuring apparatus 1 will be described. A line voltage measuring apparatus 1 shown in FIG. 1 is an example of a non-contact type voltage measuring apparatus according to the present invention, and includes two electric wires (for example, a covering shown in FIG. 1) as an example of a measurement object in the present invention. A line voltage Vd between the electric wires 100a and 100b (hereinafter, also referred to as “covered wire 100” when not distinguished) is configured to be able to measure the covered wire 100 in a non-contact manner. Specifically, as shown in FIGS. 1 and 2, the line voltage measuring apparatus 1 includes a pair of measuring units 2 a and 2 b (hereinafter, also referred to as “measuring unit 2” when not distinguished). .

  The measurement unit 2a is an example of a first measurement unit according to the present invention. As shown in FIG. 1, the measurement unit 2a includes a detection unit 4a, a measurement unit 5a, a lamp 6a, a communication unit 7a ("first wireless communication in the present invention"). An example), an operation unit 8a, a control unit 10a, and a battery 11 are arranged in the case body 3a (see FIG. 2). The measurement unit 2a is configured in a cylindrical shape as a whole that can be held with one hand (the size and weight are defined so as to be held with one hand). As shown in FIG. 2, the tip 22 (upper end in the figure) of the measurement unit 2a is formed in a curved surface in which the contact surface that contacts the covered electric wire 100 during the measurement is curved in a concave shape. Yes.

  On the other hand, the measurement unit 2b is an example of the second measurement unit in the present invention. As shown in FIG. 1, the measurement unit 2b, the measurement unit 5b, the lamp 6b, the communication unit 7b (the “second An example of a “wireless communication unit”, an operation unit 8b, a display unit 9, a control unit 10b, and a battery 11 are arranged in a case body 3b (see FIG. 2). The measurement unit 2b is configured in a cylindrical shape as a whole that can be held with one hand (size and weight are defined so as to be held with one hand) in the same manner as the measurement unit 2a. Further, as shown in FIG. 2, the front end portion 22 (upper end portion in the figure) of the measurement unit 2b has a contact surface that contacts the covered electric wire 100 at the time of measurement in the same manner as the measurement unit 2a. It is formed on a curved surface that curves in a concave shape.

  The detection unit 4a and the detection unit 4b, the measurement unit 5a and the measurement unit 5b, the lamp 6a and the lamp 6b, the communication unit 7a and the communication unit 7b have the same functions. Therefore, in the following description, when the detection units 4a and 4b are not distinguished from each other, the detection unit 4a is simply referred to as “detection unit 4”. Sometimes it is also simply referred to as “lamp 6”, and when it does not distinguish between the communication units 7a and 7b, it is also simply referred to as “communication unit 7”.

  The detection unit 4 includes, for example, the detection electrode 14 (electrode in the present invention) shown in FIG. 1, and a variable capacitance circuit, a current detection circuit, and an amplification circuit (not shown). This detection unit 4 is a known detection disclosed by the applicant in Japanese Patent Application Laid-Open No. 2007-132926, taking as an example the AC voltage supplied to the covered electric wire 100 based on the electrostatic capacitance with the covered electric wire 100. Detection is performed by a method, and detection signals Sda and Sdb (hereinafter also referred to as “detection signal Sd” when not distinguished) are output. In this case, the detection electrode 14 is accommodated in the distal end portion 22 of the measurement units 2a and 2b.

  The measurement unit 5 is configured to detect the detection signal Sd output from the detection unit 4 and a reference potential (for example, the ground potential of the measurement units 2a and 2b. To be precise, via the human body of the measurer having the measurement units 2a and 2b. AC voltage supplied to the covered wire 100 based on the ground potential connected to the ground potential of the measurement units 2a and 2b (specifically, the voltage between the covered wire 100 and the ground potential: the present invention). Are measured by a known measurement method disclosed by the applicant in the above-mentioned publication, and voltage data Dva and Dvb for the measured values are measured. (Hereinafter referred to as “voltage data Dv” when not distinguished) is generated and output. The lamp 6 corresponds to an illuminating unit in the present invention, and is disposed on the side of the tip 22 of the case main bodies 3a and 3b as shown in FIG. 2, and is controlled by the control units 10a and 10b as will be described later. To illuminate the front of the measurement units 2a and 2b.

  As will be described later, the communication unit 7 performs transmission / reception of the control signal S1 and transmission / reception of the voltage data Dva in accordance with the control of the control units 10a and 10b. In this case, in the line voltage measuring apparatus 1, the antenna of the communication unit 7 is accommodated in the base end portion 21 (see FIG. 2) of the case main bodies 3a and 3b of both measurement units 2a and 2b. In the line voltage measuring apparatus 1, the two communication units 7 are configured to be capable of wireless communication according to a specific low power wireless standard as an example. Note that the configuration of the wireless communication unit in the present invention is not limited to the above example, and for example, a configuration for executing wireless communication according to a known wireless communication standard such as the Bluetooth standard or the IrDA standard may be adopted. it can.

  As shown in FIG. 2, the operation unit 8a includes a power switch 31 disposed on the case body 3a. On the other hand, the operation unit 8b includes a power switch 31, a measurement button 32 (measurement operation unit in the present invention), and an illumination button 33 disposed on the case body 3b. In this case, when the power switch 31 is operated, power from the battery 11 is supplied to each component of the measurement units 2a and 2b. When the measurement button 32 is operated, the measurement process of the line voltage Vd is started under the control of the control unit 10a as described later. Furthermore, when the illumination button 33 is operated, the supply of power to the lamp 6 is started and stopped in both the measurement units 2a and 2b as described later. The display unit 9 is constituted by a liquid crystal display, for example, and is disposed in the central portion 23 of the case main body 3b as shown in FIG.

  The control unit 10a controls the measurement process of the voltage data Dva by the measurement unit 5a and the lighting / extinction of the lamp 6a according to the control signal S1 transmitted from the control unit 10b of the measurement unit 2b. Moreover, the control part 10a transmits the voltage data Dva output from the measurement part 5a to the measurement unit 2b from the communication part 7a. On the other hand, the control unit 10b transmits various control signals S1 from the communication unit 7b to the measurement unit 2a in response to the switch operation of the operation unit 8b, and also measures the voltage by the measurement unit 5b and turns on / off the lamp 6b. To control. The control unit 10b corresponds to a calculation unit in the present invention, and is specified based on the voltage data Dvb output from the measurement unit 5b and the voltage data Dva transmitted from the measurement unit 2a (that is, each measurement unit The differential voltage of each voltage (the voltage between the covered wire 100a and the ground potential and the voltage between the covered wire 100b and the ground potential) of the two covered wires 100a and 100b (detected by 2a and 2b) Measurement (calculation) is performed as the voltage Vd. Further, the control unit 10b causes the display unit 9 to display the calculated value of the line voltage Vd.

  Next, a method for measuring the line voltage Vd between the covered electric wires 100a and 100b as the measurement object using the line voltage measuring apparatus 1 will be described with reference to the drawings.

  First, the power switch 31 is operated in both the measurement units 2a and 2b. At this time, power from the battery 11 is supplied to each component of the measurement unit 2a and the measurement unit 2b. Next, each measurement unit 2a, 2b is held with both hands by holding each central portion 23 (holding portion in the present invention: see FIG. 2), and in this state, the contact surface of each tip portion 22 is held. The coated wires 100a and 100b are brought into contact with each other. In this case, since the contact surface of the distal end portion 22 is formed in a curved surface that curves in a concave shape, the entire or substantially entire region of the contact surface and the outer peripheral surface of the covered electric wire 100 are abutted as a result. The positional deviation between the wire 22 and the covered electric wire 100 is prevented.

  Subsequently, the measurement button 32 in the operation unit 8b of the measurement unit 2b is operated. At this time, the control unit 10b transmits a control signal S1 instructing the start of the measurement process from the communication unit 7b to the measurement unit 2a, and controls the measurement unit 5b to start the measurement process of the voltage data Dvb. On the other hand, in the measurement unit 2a, the control unit 10a receives the control signal S1 from the measurement unit 2b (control unit 10b) via the communication unit 7a, and controls the measurement unit 5a to start measurement processing of the voltage data Dva. Let At this time, in each of the measurement units 2a and 2b, the detection unit 4 detects the AC voltage supplied to the covered electric wire 100 based on the electrostatic capacitance between the measurement unit 2a and 2b, and detects the detection signal Sd. Output to 5 respectively. In addition, the measurement unit 5 receives an AC voltage (a voltage between the covered wire 100a and the ground potential, and a voltage between the covered wire 100a and the ground potential) based on the detection signal Sd output from the detection unit 4 and the ground potential. Voltage between the covered electric wire 100b and the ground potential) is measured, and voltage data Dv for the measured value is output.

  At this time, in the measurement unit 2a, the control unit 10a causes the communication unit 7a to transmit the voltage data Dva output from the measurement unit 5a to the measurement unit 2b. On the other hand, in the measurement unit 2b, the control unit 10b specifies the voltage (covered wire 100a and ground potential) of the covered wire 100a specified by the voltage data Dva received via the communication unit 7b (that is, detected by the measurement unit 2a). And the voltage of the covered wire 100b specified by the voltage data Dvb output from the measuring unit 5b (that is, the voltage between the covered wire 100b and the ground potential). ) Is calculated (measured) as the line voltage Vd. Subsequently, as illustrated in FIG. 2, the control unit 10 b causes the display unit 9 to display a number indicating the value of the measured line voltage Vd (in this example, a character string “198.5 v”).

  In this case, in the line voltage measuring apparatus 1, the control unit 10b of the measurement unit 2b transmits the voltage data Dva transmitted from the measurement unit 2a by wireless communication and the voltage data Dvb detected (measured) in the measurement unit 2b. Is used to calculate (measure) the line voltage Vd. Therefore, even when the covered wires 100a and 100b in the above example are separated by, for example, about several tens of meters, for example, one of the two measurers grips the measurement unit 2a and touches the covered wire 100a. It is possible to reliably and easily measure the line voltage Vd between the largely separated covered wires 100a and 100b by allowing the other measurer to hold the measurement unit 2a and bring it into contact with the covered wire 100a. It has become. In addition, even if it is one measurer by employ | adopting the structure which provides the clamp mechanism (not shown) in the front-end | tip part 22 side in said measurement unit 2a, and clamps the covered electric wire 100a with the measurement unit 2a, It becomes possible to reliably and easily measure the line voltage Vd between the covered electric wires 100a and 100b which are largely separated.

  Further, for example, when it is difficult to visually recognize the covered wires 100a and 100b due to the presence of the covered wires 100a and 100b as the measurement object or the low illuminance at the measurement site, the measurement unit 2b The illumination button 33 in the operation unit 8b is operated. At this time, the control unit 10b turns on the lamp 6b by supplying power from the battery 11, and transmits a control signal S1 instructing to turn on the lamp 6a from the communication unit 7b to the measurement unit 2a. In response to this, in the measurement unit 2a, the control unit 10a turns on the lamp 6a. Thereby, the front part 22 of measurement unit 2a, 2b, ie, the covered electric wire 100a, 100b of a measuring object is illuminated. For this reason, as a result of being able to surely visually recognize the portion where the tip portions 22 of the measurement units 2a and 2b should be brought into contact with each other, the measurement operation can be performed safely and easily.

  Furthermore, in this line voltage measuring apparatus 1, each measurement unit 2a, 2b is configured to be held with one hand, and all the line voltage measuring apparatus 1 including the operation units 8a, 8b and the display unit 9 are configured. The constituent elements are configured to be accommodated or disposed in either of the measurement units 2a and 2b. For this reason, unlike the conventional voltage measurement device in which the main body and the detection electrode are configured separately and connected to each other via a signal cable, the measurement unit 2a, which is in contact with the covered wires 100a, 100b, It is possible to operate the power switch 31, the measurement button 32, and the illumination button 33 and read the value of the line voltage Vd displayed on the display unit 9 without keeping an eye on the front end 22 of 2b. Yes. As a result, for example, when a high voltage line is wired in the vicinity of the covered electric wires 100a and 100b due to the eyes being taken away from the tip part 22 of the measurement units 2a and 2b, the tip part 22 is connected to the high voltage line. It is possible to sufficiently reduce the risk of contact (that is, to perform measurement work safely). In addition, even when measuring in a narrow measurement site, it is not necessary to perform measurement with an unreasonable posture with the main body part hanging over the shoulder or neck, making it easy to perform measurement. . Moreover, since it is possible to avoid keeping an eye on the distal end portion 22 of the measurement units 2a and 2b or performing measurement with an unreasonable posture, the distal end portion 22 of the measurement units 2a and 2b is separated from the covered electric wires 100a and 100b. It is also possible to prevent a situation in which accurate measurement becomes difficult due to separation.

  As described above, according to the line voltage measuring apparatus 1, the communication unit 7a that transmits the voltage data Dva of the measured voltage (first voltage) to the measuring unit 2b is provided, and the first measuring unit in the present invention is provided. The corresponding measurement unit 2a, the communication unit 7b that receives the voltage data Dva, the voltage specified based on the voltage data Dvb, and the differential voltage between the voltages specified based on the voltage data Dvb are expressed as the line voltage Vd ( The measurement unit 2b corresponding to the second measurement unit in the present invention is configured by including the control unit 10a that calculates the voltage to be measured), and thus the detection electrode is connected to each measurement unit via a signal cable. Unlike the non-contact voltmeter, even if a pair of measurement objects are largely separated, the distance range in which both communication units 7a and 7b can communicate wirelessly If it is possible to reliably measure the measurement target voltage. Further, since an unnecessarily long signal cable is not required, the line voltage measuring device 1 can be handled sufficiently easily.

  Further, according to the line voltage measuring apparatus 1, the display unit 9 for displaying the line voltage Vd is arranged in the measurement unit 2b, so that the line voltage Vd (measurement target) is separated from the measurement units 2a and 2b. Unlike the configuration in which a display device (display unit: not shown) is provided to display the voltage), the line voltage Vd is displayed from the measurement operation of the line voltage Vd while only having both the measurement units 2a and 2b. The series of processes up to can be completed. When a display device is provided separately from both measurement units 2a and 2b, or when a display unit is provided in the measurement unit 2a, the value of the line voltage Vd (measurement target voltage) calculated by the control unit 10b is set. While it is necessary to transmit the measurement unit 2b to the display device or the measurement unit 2a, according to the line voltage measurement device 1, the value of the line voltage Vd calculated by the control unit 10b is immediately stored in the measurement unit 2b. Since it can be displayed on the display unit 9, the line voltage Vd can be displayed promptly without consuming unnecessary power for transmission of the measurement result.

  Further, according to the line voltage measuring apparatus 1, the operation unit 8b (measurement button 32) for instructing the measurement of the line voltage Vd is disposed in the measurement unit 2b, so that the measurement units 2a and 2b are different from each other. Unlike the configuration in which the measurement operation unit according to the present invention is provided in a separate device (not shown), the measurement process of the line voltage Vd can be started with only the two measurement units 2a and 2b. Unlike the configuration in which the measurement button 32 is provided in a device separate from the measurement units 2a and 2b and the configuration in which the measurement button 32 is provided in the measurement unit 2a, the operation signal of the measurement button 32 is sent to the measurement unit 2b (control unit 10b). Therefore, the time required from the operation of the measurement operation unit (measurement button 32) to the calculation of the line voltage Vd by the control unit 10b can be sufficiently shortened by the amount that the process to transmit to is unnecessary.

  Further, according to the line voltage measuring apparatus 1, the contact surfaces of the tip portions 22 of the respective measurement units 2a and 2b are formed into curved surfaces that are curved in a concave shape, whereby two measurement objects as a pair of measurement objects. When the line voltage Vd for the covered wires 100a and 100b is measured as the voltage to be measured in the present invention, the entire or almost the entire contact surface and the outer peripheral surface of the covered wires 100a and 100b are brought into surface contact. Therefore, it is possible to prevent the positional deviation between the tip portion 22 and the covered wires 100a and 100b.

  Moreover, according to this line voltage measuring apparatus 1, since the lamps 6 are arranged in at least one of the measurement units 2a and 2b (both in this example), for example, the covered wires 100a and 100b exist in the shade. Even if the illuminance at the measurement site is low, it is possible to illuminate the measurement object 2a, 2b in front of the tip portion 22, that is, the covered electric wires 100a, 100b, so that the measurement work can be performed safely and It can be done easily.

  The present invention is not limited to the configuration described above. For example, the example in which the measurement units 2a and 2b are configured as a column as a whole has been described above, but the shapes of the first measurement unit and the second measurement unit in the present invention are not limited to this, and can be arbitrarily held with one hand. Can be configured. As an example, as shown in FIG. 3, a gripping portion 63 (left side portion in the figure) and a portion on the tip end portion 62 side in which the detection portion 4 and the display portion 9 are housed (arranged) (right side portion in the drawing). It is possible to employ a measurement unit 52 that is configured in a shape (gun type) that forms a predetermined angle. In the following description, constituent elements having the same functions as those of the measurement units 2a and 2b described above are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIGS. 3 and 4, the flange portion 71 a (or the flange portion 71 b) is attached to the distal end portion of the gripping portion 63 in the measurement unit 52 (or the distal end portion of the central portion 23 (gripping portion) in the measurement unit 2). A mounted configuration can also be employed. According to this configuration, by attaching the flanges 71a and 71b, the measurement unit 52 and the measurement unit 2 can be mounted at a measurement site where a high-voltage wire is disposed in the vicinity of the covered electric wire 100 of the measurement object. Even if the gripping hand slips during measurement, it is possible to reliably prevent the hand from coming into contact with the high-voltage line.

  Further, it is possible to employ a configuration in which a sound generation unit is provided and a sound that can identify the magnitude of the line voltage Vd is generated from the sound generation unit. In this case, for example, a configuration in which the buzzer sound is increased as the line voltage Vd is increased and the buzzer sound is decreased as the line voltage Vd is decreased may be employed as the sound generation mode. A configuration in which the value of Vd is voice-guided by words can also be employed. According to this configuration, for example, when the covered electric wires 100a and 100b are present in a narrow place or an obstacle exists in the vicinity of the covered electric wire 100, it is difficult to visually recognize the display unit 9. Even if it exists, the value of the line voltage Vd can be recognized reliably.

  Furthermore, a determination unit is provided for determining whether or not a predetermined accuracy (a parameter indicating how close the measurement value is to a true value) is within a measurable range defined as a range of the measurement value to be secured. When the determination unit determines that the measured value is within the measurable range, it notifies whether the measured line voltage Vd is within the measurable range by text display, voice output, and lamp lighting. A configuration can also be adopted. According to this configuration, the line voltage Vd is displayed when it is notified that the line voltage Vd is within the measurable range (or the value of the displayed line voltage Vd is read at the time of the notification). Thus, more accurate measurement of the line voltage Vd can be performed.

  Moreover, although the example which displays the number which shows the value of the line voltage Vd on the display part 9 was mentioned above, as shown in FIG. 5, the bar graph which shows the magnitude of the value of the line voltage Vd by the length is displayed on the display part. 9 can also be displayed. Moreover, as shown in FIG. 6, both a bar graph and a number can be displayed on the display unit 9. In this case, as shown in FIG. 7, it is also possible to employ a configuration in which a display unit 9a different from the display unit 9 is provided and both numbers and bar graphs are separately displayed on the two display units 9 and 9a. . According to this configuration, the value of the line voltage Vd can be intuitively recognized by the bar graph.

  Furthermore, although the line voltage measuring device 1 configured to include two measuring units 2a and 2b has been described as an example, the configuration of the voltage measuring device according to the present invention is not limited to this. For example, the line voltage measurement apparatus 1 can be configured by including one or a plurality of measurement units 2a in addition to the measurement units 2a and 2b. Specifically, the line voltage measuring device 1 is configured by combining a plurality of measurement units 2a and at least one measurement unit 2b, thereby providing an operation unit 8b, a display unit 9, and a control unit 10b. Each measurement unit 2a (first measurement unit in the present invention) is sequentially switched and wirelessly connected to the measurement unit 2b (second measurement unit in the present invention) to measure various measurement target voltages.

  In this case, only one pair of measurement units 2a and 2b is used for one measurement object (hereinafter also referred to as “measurement object A”), and a plurality of other measurement objects (hereinafter, “measurement object B” as an example) When measuring the measurement target voltage between the measurement target A and B, for example, the measurement unit 2a is connected to the measurement target B from the measurement target B. It is necessary to measure the voltage to be measured by removing it and pressing it against the measurement object C. On the other hand, for example, in the line voltage measuring apparatus 1 configured by one measurement unit 2b and a plurality of measurement units 2a, the measurement unit 2b is pressed against the measurement object A and the measurement objects B and C are 2 By pressing the measuring unit 2a, the measuring unit 2b can select the measuring unit 2a that receives the voltage data Dva as appropriate. In addition, the voltage to be measured between the measuring objects A and C can be measured sequentially. Therefore, by adopting such a configuration, it is possible to easily measure a plurality of measurement target voltages. In this case, in order to maintain the state in which the plurality of measurement units 2a are pressed against the measurement objects B, C, etc., the measurement unit 2a (first measurement unit in the present invention) has a clamp mechanism ( (Not shown) is preferably provided so that the state in which the detection unit 4 is pressed against the object to be measured can be maintained without being supported by the measurer.

  Moreover, although the example which arrange | positioned the operation part 8b which has the measurement button 32, and the display part 9 which displays the value of the line voltage Vd in the measurement unit 2b (2nd measurement unit in this invention) was demonstrated. The configuration of the voltage measuring device according to the present invention is not limited to this, and the measurement button 32 and the display unit 9 are arranged in a device separate from the measuring unit 2a (first measuring unit in the present invention) and the measuring units 2a and 2b. You can also Furthermore, although the example in which the lamp 6 is provided in both the measurement units 2a and 2b has been described, the lamp 6 may be provided in only one of the measurement units 2a and 2b. In addition, although the example in which the present invention is applied to the line voltage measuring apparatus 1 that measures the line voltage of the covered electric wires 100a and 100b as the measurement target voltage in the present invention has been described, various voltages other than the line voltage (for example, The present invention can also be applied to a voltage measuring device that measures a ground potential of a measurement target device and a potential between each power cable as a measurement target voltage.

1 Line Voltage Measuring Device 2a, 2b, 52 Measurement Unit 4a, 4b Detection Unit 5a, 5b Measurement Unit 6a, 6b Lamp 7a, 7b Communication Unit 8a, 8b Operation Unit 9, 9a Display Unit 10a, 10b Control Unit 14 Detection Electrode 22, 62 Tip portion 32 Measuring button 63 Grasping portion 71a, 71b Hook portion 100a, 100b Covered wire Dva, Dvb Voltage data S1 Control signal Sda, Sdb Detection signal Vd Line voltage

Claims (10)

A voltage measuring device for measuring a voltage to be measured between a pair of measurement objects,
A first measurement unit that measures a first voltage between one of the measurement objects and a reference potential in a non-contact manner with respect to the one measurement object, and the other of the measurement objects and a reference potential A second measurement unit for measuring the second voltage between the second measurement object and the other measurement object in a non-contact manner,
The first measurement unit includes a first wireless communication unit that transmits voltage data of the measured first voltage to the second measurement unit;
The second measurement unit includes a second wireless communication unit that receives the voltage data, the second voltage, and a differential voltage of the first voltage specified based on the voltage data as the measurement target voltage. A voltage measuring device comprising: a calculation unit that calculates as: A plurality of the first measurement units;
The arithmetic unit includes a plurality of calculation units based on the second voltage and the plurality of first voltages measured by the first measurement units and transmitted as the voltage data from the first measurement units. The voltage measuring device according to claim 1, wherein the voltage to be measured is calculated.   The voltage measurement device according to claim 1, wherein the second measurement unit includes a display unit that displays the measurement target voltage.   The voltage measurement device according to claim 3, wherein the display unit is configured to be able to display the magnitude of the measurement target voltage in a bar graph.   5. The voltage measurement device according to claim 1, wherein the second measurement unit includes a measurement operation unit for instructing measurement of the measurement target voltage. 6. It comprises electrodes for voltage detection respectively housed at the tip of each measurement unit,
The voltage measuring device according to any one of claims 1 to 5, wherein the tip portion is formed on a curved surface in which a contact surface that is in contact with an electric wire as the measurement object is curved in a concave shape.   The voltage measuring device according to claim 1, further comprising an illumination unit that is disposed on at least one of the measurement units and illuminates the front of the measurement unit.   The voltage measuring device according to any one of claims 1 to 7, further comprising a collar portion attached to a distal end portion of a grip portion that grips each measurement unit.   The voltage measuring device according to claim 1, further comprising a sound generation unit that generates a sound in a manner in which the magnitude of the voltage to be measured can be identified.   The voltage measuring device according to any one of claims 1 to 9, further comprising a notifying unit that notifies when the measurement target voltage can be measured with a predetermined accuracy.

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