JP2005134233A - Measuring instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problems wherein, in order to measure a power, dedicated wiring for voltage measurement and a current transformer for current measurement and dedicated wiring therefor are required respectively in each circuit, and fixing thereof to each cable way to be measured and correct wiring into a measuring apparatus are required, and at that time, the wiring committing no error in discrimination of the polarity or the phase of a current measuring instrument and in discrimination of the phase for voltage measurement is required, which is a work requiring extreme care, and especially in the case of a large number of circuits, defects caused by miswiring occur frequently. <P>SOLUTION: This measuring instrument is equipped with a voltage measuring part 1 having the conductive tip, and a clamp type current measuring part 11, and has a constitution wherein a coated wire 6 is cramped by the current measuring part, to thereby measure the current in the wire, and the tip of the voltage measuring part is allowed to penetrate the coated wire at the cramping time and the tip is brought into contact with a conductive part in the wire, to thereby measure simultaneously the voltage of the wire. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an electric energy measurement technique for measuring electric current and voltage of an electric circuit to be measured and obtaining electric energy.

  Conventionally, in order to measure power, the following methods have been used to measure various amounts of power such as voltage and current. In other words, when measuring the voltage, a dedicated wire for voltage measurement is fixed to the charging part of the circuit to be measured by bolt fastening, and the voltage information is sent to the measuring part. In the case of a high-voltage circuit, the same voltage measurement was performed through an instrument transformer. Another method of wiring connection to the circuit to be measured is a clamp-type voltage measurement method. In this case as well, measurement is performed using a dedicated wiring for voltage measurement that clamps the charged part of the measurement circuit. It was.

  Next, when measuring current, an instrument current transformer is installed in the circuit under test separately from the voltage input wiring, and a dedicated current measurement wiring is required to send the secondary output to the measuring instrument. there were.

  FIG. 19 shows the above-described conventional voltage and current measuring instrument. In FIG. 19, the voltage input dedicated wiring 103 is fixed to a predetermined position of the conductor 102 of the measured circuit 101, which is a measured section, by the fixing means 104 by bolt fastening, and the voltage of the conductor 102 of the measured circuit 101 is measured. The measured voltage information is sent to the measuring instrument 105. In addition, a current transformer 107 connected to the current input dedicated wiring 106 is clamped to the conductor 102 of the measured circuit 101, the current of the conductor 102 of the measured circuit 101 is measured, and the measured current information is sent to the measuring instrument 105. It was.

  In this conventional example, the measured circuit 101 is a conductor 102 without an insulation coating portion. However, when the measurement circuit 101 has an insulation coating portion and has a conductor portion inside, the coating portion is removed. It was necessary to attach the fixing means 104 by exposing the conductor.

In addition, as a prior art example of a measuring instrument equipped with a current transformer that measures the current of the part to be measured, a technique in which phase identification means is applied to the current transformer so that there is no wiring mistake when attaching the current transformer is patented It is shown in Document 1.
JP 2000-74946 A (FIG. 1)

  As described above, in order to measure power, a dedicated wiring for voltage measurement, a current transformer for current measurement, and its dedicated wiring are required, respectively, and for actual measurement, each of them is required. Since it is necessary to wire to the measuring circuit after fixing it to the circuit to be measured, when wiring to a three-phase circuit, etc., it is necessary to wire the polarity of the current measuring instrument, the phase identification, and the voltage measurement phase without error. This is a work that requires great care, and the current situation that troubles due to miswiring frequently occur in the wiring site.

  Moreover, since there are many wirings when there are many measurement points, it is a more complicated operation and has a problem of increasing wiring space.

  This invention solves the said subject, and relates to the quality improvement by the prevention of the incorrect wiring in the measurement of various electric power quantities, the reduction of a wiring member, space saving, and the improvement of work efficiency.

  In order to achieve the above object, the measuring instrument according to the present invention includes a conductive voltage detection unit, and the tip of the measurement unit penetrates the covered electric wire of the measurement target unit so as to touch the conductive unit in the electric wire. It measures the voltage of.

  In particular, the voltage detection unit has a sharp shape and penetrates the covered electric wire.

  In addition, the measuring instrument of the present invention further includes an annular and clamp-type current measuring unit, and a voltage detecting unit is provided on the annular inner surface of the current measuring unit so that the tip is directed inward, and the current measuring unit is measured. The current and voltage of the electric wire are measured by clamping to the covered electric wire of the portion and allowing the tip of the voltage detection portion to penetrate the electric wire and touch the conductive portion in the electric wire.

  Further, the measuring instrument of the present invention comprises a flat and deformable core part and a coil part wound around a part of the measuring part. It measures current. Moreover, the voltage detection part which has the above-mentioned electroconductive and sharp shape is provided, and voltage is measured.

  The measuring instrument of the present invention comprises a divided core part and a coil part wound around at least a part of the core part. It forms and measures the electric current of a to-be-measured part. Moreover, the voltage detection part which has the above-mentioned electroconductive and sharp shape is provided, and voltage is measured.

  In addition, the measuring instrument of the present invention includes a flat core-shaped deformable core part, an elastic holding guide that is in contact with the outer peripheral surface of the core part and formed in an annular shape, and is wound around at least a part of the core part. The core portion and the holding guide both have a cut portion that can be opened by an external force at substantially the same position of the ring, and the measured portion is inserted into the measured portion by inserting the measured portion from the cut portion. Measuring instrument with a current measurement unit that measures the current of In addition, the above-described conductive voltage detector is provided, and the voltage is measured simultaneously.

  As is clear from the above description, the current / voltage measuring instrument of the present invention eliminates the need for complicated wiring when measuring current and voltage, and adopts the integration of the instrument of the measuring unit and a simple mounting method. When measuring various amounts of power such as measured power, it is possible to reduce wiring members, improve quality such as prevention of incorrect wiring, save space, and improve work efficiency.

  In particular, when there are a plurality of measurement circuits in the past, not only the current measurement unit's phase and polarity classification and voltage phase arrangement are correct, but also the distinction between the circuits is necessary, resulting in extremely complicated wiring. However, according to this method, the current and voltage measurement unit is integrated and the output unit is organized for each circuit, so there is no need to worry about polarity or phase wiring errors. Highly reliable work can be done. In addition, it is possible to contribute to safe work by improving workability and saving the space of the measuring unit.

(Embodiment 1)
The first embodiment of the present invention will be described below with reference to FIGS.

  1 is a voltage measuring instrument according to Embodiment 1 of the present invention, FIG. 2 (a) is a conceptual diagram during voltage measurement by the voltage measuring instrument shown in FIG. 1, and FIGS. 2 (b) and (c) are respectively A circuit schematic diagram at the time of voltage measurement shown in FIG. FIG. 3 is a cross-sectional view of a portion where the voltage measuring instrument is fixed to the covered electric wire at the time of voltage measurement in FIG.

  In FIG. 1 to FIG. 3, reference numeral 1 denotes a voltage detection unit that is conductive and has a pointed needle shape, and measures the voltage by contacting the conductive unit of the measurement target unit. Reference numeral 2 denotes a voltage transmission unit that is configured by a covered electric wire and transmits voltage information measured by the voltage detection unit 1, and 3 is a voltage output unit that is configured by a connector and receives voltage information. Further, the voltage output unit 3 is connected to the measurement display unit 4 that displays and calculates the measurement results, and displays the actual measurement results. The voltage measuring unit body 5 is formed by the voltage detection unit 1, the voltage transmission unit 2, and the voltage output unit 3.

  Reference numeral 6 denotes a covered electric wire of the portion to be measured, 7 denotes a conductor portion in the voltage transmission portion 2, and 8 denotes a covering portion of the voltage transmission portion 2. Furthermore, 9 is a conductor part of the covered electric wire 6, and 10 is a covered part of the covered electric wire 6.

  The conductor portion 7 transmits voltage information, and the covering portion 8 has the effect of improving transmission accuracy and preventing electric shock due to human contact, etc., by insulating the conductor portion to which voltage is applied from the outside.

  As shown in FIG. 1 to FIG. 3, the voltage detection unit 1 has a needle shape with a sharp tip, so that it can be easily covered by simply passing through and fixing the covered part of the covered electric wire 6 of the measurement target part. Since the voltage detector 1 can be brought into contact with the conductive portion 9 inside the electric wire 6, a voltage measuring instrument capable of measuring the voltage by a very safe and simple operation without touching the charging circuit during the operation is provided. can do.

  In the present embodiment, when measuring the voltage of the electric wire, one needle-shaped voltage measuring instrument having a sharp tip may be brought into contact with the conductive portion through the covering portion of each measured portion. . 2B and 2C are schematic circuit diagrams at that time, FIG. 2B shows the phase-to-phase voltage, and FIG. 2C shows the phase-to-ground voltage measurement diagram.

  Further, the voltage measuring instrument 5 improves the insulation protection force and the physical fixing force by holding a predetermined fixing portion of the covered electric wire 6 of the circuit to be measured by a taping treatment or a binding jig such as a fixing band. Therefore, a safer and more reliable measuring unit can be provided.

(Embodiment 2)
Next, a second embodiment of the present invention will be described with reference to FIGS.

  In the present embodiment, the same configurations as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  FIG. 4 shows an example of a current / voltage measuring instrument in the present embodiment. FIG. 5 shows a conceptual diagram at the time of current / voltage measurement by the current / voltage measuring instrument shown in FIG. FIG. 6 is a cross-sectional view of a portion where the current / voltage measuring instrument is fixed to the covered electric wire. 7 to 10 show other examples of the voltage detection unit.

  The present embodiment is different from the first embodiment in that the voltage detection unit shown in the first embodiment is incorporated into a current measuring instrument and integrated.

  In FIG. 4, reference numeral 1 denotes a voltage measuring unit having a needle shape with a sharp tip as in the first embodiment. Reference numeral 11 denotes a ring-shaped current measuring unit having a current-transforming function composed of a core and a secondary coil, and has a clamp shape that can be opened and closed around the measured portion. Reference numeral 12 denotes a current-voltage transmission unit that is configured by a covered electric wire, a shielded wire, or the like, and that transmits current and voltage information measured by the current measurement unit 11 and the voltage detection unit 1. Reference numeral 13 is a current / voltage output unit configured by a connector or the like for receiving current and voltage information, and is connected to the measurement display unit 4 for displaying and calculating the measurement results shown in FIG. Display the measurement results.

  The operation of the current / voltage measuring instrument configured as described above will be described.

  FIG. 5 shows a state in which the current measuring unit of the current / voltage measuring instrument 14 is installed by surrounding and covering the covered electric wire 6 of the measured part. When the current / voltage measuring instrument 14 is installed as described above, the current measuring section of the current / voltage measuring instrument 14 is opened in a clamped state as shown in FIG. Clamp the covered wire by closing. At this time, the voltage measuring unit 1 having a needle shape with a sharp tip penetrates the covered electric wire 6 and can reach the charging part of the covered electric wire 6. FIG. 6 shows a cross-sectional view of the portion of FIG. 5 where the current / voltage measuring instrument 14 is fixed to the electric wire 6 of the circuit to be measured, and the voltage detector 1 penetrates the conductive portion 9 of the coated electric wire 6 of the measured portion. This shows how the voltage is measured.

  In other words, the current measurement unit and the voltage measurement unit can be attached to the circuit under test in a single operation with the above-described configuration. It is possible to provide a current / voltage measuring instrument capable of safely and easily performing an error-free operation without performing a dangerous wiring operation. In addition, the clamp part of the electric current measurement part 11 has an effect of preventing measurement troubles and accidents due to an electric shock accident due to contact with a human body, an electric leakage, a ground fault or the like by using an insulating material on the surface.

  In addition, the current / voltage measuring instrument in the present embodiment is a unit in which the voltage measuring unit and the current measuring unit are integrated, but may have a structure in which only the voltage measuring unit is detached and separated from the current measuring unit. As a result, voltage and current can be measured at different locations, and countermeasures can be taken according to the condition of the object to be measured.

  Moreover, the voltage detection part shown in 7 can increase the effect of securing the contact surface between the charging prevention part and the charging part of the part to be measured by attaching the return preventing prevention 1a like a fishing hook at the tip. it can. The voltage detection unit shown in FIG. 8 has a blade shape with a predetermined width and a thin tip, and when the clamp-type current / voltage measuring instrument 11 is clamped, the voltage detection unit 1 having a blade shape is attached to the coated wire 6. Is inserted and penetrates the coating portion 10 to contact the conductive portion 9.

  Furthermore, the voltage measuring unit shown in FIG. 9 (a) has two blade-shaped portions facing each other with a predetermined interval, and at the time of installation, the coated electric wire 6 of the measured portion is placed by the blade-shaped portions facing each other. The blade-shaped part is inserted into the coated electric wire 6 by being sandwiched in the hollow part 1b that can be formed, penetrates the coated part 10 and is brought into contact with the conductive part 9. FIG. 9 (b) shows an example in which this voltage measuring unit is integrated with a clamp-type current measuring instrument 11, and the blade-shaped part can be brought into contact with the conductive part of the coated electric wire 6 at the time of clamping. A measuring device can be installed at the same time. FIG. 10 shows another example in which the blade-shaped portion of the voltage detection unit 1 shown in FIG. 8 is provided on the inner side of the annular current measuring device on the radially opposite side, thereby clamping the current measuring device. Sometimes the blade-shaped voltage detection part can be reliably brought into contact with the conductive part 9 of the coated electric wire 6, and the voltage and current can be measured more accurately.

  In addition, what was shown above showed the Example in this Embodiment, It does not limit to these, For example, the voltage measurement part of the blade shape shown in FIG. 10 is not limited to two. Three or more may be sufficient. Similarly, the blade shape shown in FIG. 9B may be two or more.

(Embodiment 3)
Next, Embodiment 3 of the present invention will be described with reference to FIG.

  In the present embodiment, the same configurations as those in the first and second embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.

  FIG. 11 shows an example of the current-voltage measuring instrument shown in this embodiment. In FIG. 11, 15 is a conductor of a circuit to be measured, and 1 is a spring-shaped voltage measuring unit having elasticity.

  The current / voltage measuring instrument according to the present embodiment is a conductor that is not covered with the portion to be measured, and differs from the second embodiment in that the shape of the voltage detector 1 is a spring shape that is an elastic body.

  The operation of the current / voltage measuring instrument configured as described above will be described.

  The current measuring instrument 11 is clamped to the conductor 15 of the unmeasured part for measuring voltage and current. On the inner side surface of the annular current / voltage measuring instrument 14, there is provided a spring-shaped voltage detecting unit 1 having elasticity, which is held so as to be in contact with the surface of the conductor 15 of the measured unit at the time of clamping. In this way, it is possible to measure both the voltage and the current without causing erroneous wiring with a simple operation.

  In addition, if the voltage detection part 1 has elasticity, it can exhibit the same effect, without being limited to a spring shape.

  Further, if the spring force of the voltage measuring unit is adjusted, the holding force for the conductor of the voltage / current measuring device itself can be obtained, so that the work for fixing the voltage / current measuring device to the conductor can be omitted.

(Embodiment 4)
Next, a fourth embodiment of the present invention will be described with reference to FIGS.

  In the present embodiment, the same components as those in the first to third embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.

  FIG. 12 shows an example of a current measuring instrument according to Embodiment 4 of the present invention. In FIG. 12, 31 indicates a core part. Although this core part 31 is comprised from the electromagnetic steel plate etc., in order to make it a flat plate shape which can be bent freely, a structure is not a single flat plate, but a plurality of plates are used such as a caterpillar, a metal belt of a watch, or a chain. In this way, it is configured so that small modules are woven together. Reference numeral 32 denotes a coil portion, which is arranged so as to go around the core portion 31. Reference numeral 33 denotes a core fixing part, which fixes the shape when the flat core 31 is rounded and deformed into an annular shape. And the current measurement part 30 is formed by these. Reference numeral 34 denotes a current transmission unit, and 35 denotes a current output unit.

  FIG. 13 is a cross-sectional view showing a state where the current measuring unit 30 shown in FIG. 12 is rounded and deformed into an annular shape. Reference numeral 36 denotes a fixing portion provided at both end portions of the belt-like core fixing portion 33 in order to fix the core fixing portion 33 in an annular shape.

  FIG. 14 shows a cross section of the current measuring device when the core fixing portion 33 is fixed in an annular shape and the current measuring device of the present embodiment is used.

  The operation of the current measuring instrument configured as described above will be described.

  In the current measuring instrument in this embodiment, the core part is not an integral fixed shape, but is configured by combining small modules. Therefore, the current measuring instrument can be freely deformed by bending, and can be deformed into the shapes shown in FIGS. However, since no distortion is left in the core portion 31, the original measurement accuracy is not impaired. In addition, the fixing portion 36 provided on the core fixing portion 33 that is fixed after the core portion 31 is formed around the circuit to be measured in an annular shape has a very simple configuration such as a hook type or a velcro tape, and can perform a reliable operation. Since it can be implemented, it is possible to provide a highly accurate current measuring instrument that can be easily deformed and attached.

  Further, in the above configuration, as shown in FIG. 6 or FIG. 11, a voltage detection unit having a needle shape with a sharp tip or a spring shape having elasticity is provided on the inner surface of the annular current measurement unit. , It is possible to easily attach a device for measuring current and voltage at the same time.

(Embodiment 5)
Next, a fifth embodiment of the present invention will be described with reference to FIGS. 15 (a) to 15 (c).

  In the present embodiment, the same components as those in the first to fourth embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.

  FIGS. 15A to 15C show an example of the current / voltage measuring instrument according to the present embodiment. In FIG. 15A, reference numeral 22 denotes a holding guide. The holding guide 22 has elasticity and maintains the shape of the core portion 31 in an annular shape.

  The difference between the present embodiment and the second to fourth embodiments is that the annular holding guide 22 is provided in contact with the outer peripheral surface of the core portion 31.

  In the present embodiment, by providing the holding guide 22 having elasticity to maintain the ring shape of the core portion 31, the core portion 31 is normally closed and held in a ring shape as shown in FIG. 15 (a). When the current is measured and attached to the circuit to be measured, the ring-shaped end portion of the core portion 31 is moved in the direction F as shown in FIG. Open the current and voltage measuring instrument into the circuit to be measured. Thereafter, the core portion 31 is closed again by the elasticity of the holding guide 22 and used as a current / voltage measuring instrument. Further, as shown in FIG. 15C, a guide for guiding the covered electric wire 6 or the conductor of the circuit to be measured into the ring-shaped core is provided on the holding guide 22 positioned at the opening end of the core portion 31, Workability can be improved.

  In addition, as shown in FIG. 15A, in the present embodiment also, the current and voltage are measured by providing the needle-shaped voltage detection unit 1 having a sharp tip on the inner peripheral side surface of the ring-shaped core unit 31. Can be installed at the same time. In addition, although not shown, the voltage detector 1 can be mounted simultaneously with a device that can measure current and voltage in the same manner for a conductor that does not have a covering portion by forming an elastic spring shape.

(Embodiment 6)
Next, a sixth embodiment of the present invention will be described with reference to FIGS.

  In the present embodiment, the same components as those in the first to fifth embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.

  FIG. 16 shows an example of a usage example of the current / voltage measuring instrument of the present embodiment. 17 and 18 show an example of a cross-sectional view of the current / voltage measuring instrument of the present embodiment.

  The difference between the present embodiment and the second to fifth embodiments is that a breaker, which is an electrical device having a connection terminal portion installed in a circuit to be measured, is used to connect a current / voltage measuring instrument to the terminal portion with a single touch. It is the point comprised so that it could be attached.

  In FIG. 16, 19 is a breaker, 20 is a breaker cover, and 21 is a cover-integrated current / voltage measuring instrument. The cover-integrated current / voltage measuring instrument 21 can be attached at the same position as the breaker cover by matching the shape with the breaker cover 20.

  Note that the cover-integrated current / voltage measuring instrument 21 in the present embodiment includes a current / voltage measuring instrument as shown in FIG. 15C described in the fifth embodiment, and covers the breaker 19 with a current, A device for measuring voltage can be installed at the same time.

  FIG. 17 shows another example of the present embodiment. Reference numeral 23 denotes a first exterior part, and 24 denotes a second exterior part. Reference numerals 31 and 25 denote core parts, respectively, and 1 denotes a voltage detector. Then, by combining the first exterior part and the second exterior part, the current measurement part that has a current transformation function and measures the current for two phases and the three voltage measurement parts are made of an insulating material as shown in FIG. Similarly, it is configured integrally with a shape similar to a breaker cover.

  The current measuring part of the first exterior part 23 is composed of a core part 31 and a coil part 32. Further, when the first exterior part 23 is attached to the breaker 19, the voltage detection part 1 is arranged so as to be elastically in contact with the three terminal connection parts that are charging parts of the circuit to be measured. Yes. The second exterior part 24 is configured to hold the two core parts 25 with an insulating material. When the second exterior part 24 is fixed to the first exterior part 23, the core part 31 and the core part 25 have a closed magnetic circuit. It is configured to configure.

  The operation of the breaker cover integrated current / voltage measuring instrument as shown in FIG. 17 will be described.

  First, the first exterior part 23 of the cover-integrated current / voltage measuring instrument shown in FIG. 17 is attached in the manner of attaching the protective cover of the terminal part to the breaker 19 already installed in the circuit to be measured. At the same time as the attachment, the voltage detector 1 which is a component thereof contacts the terminal portion of the breaker 19 while maintaining elasticity, so that stable voltage measurement can be performed.

  Next, by fixing the second exterior part 24 to the first exterior part 23, a closed magnetic circuit is formed by the core part 31 and the core part 25 with respect to the electric circuit for two phases, and the current measurement current transformer Functions are configured and current measurement can be performed. Therefore, the charged part of the breaker can be protected by a very simple operation, and both current and voltage can be measured very easily without complicated wiring work.

  Further, another example of the cover-integrated current / voltage measuring device will be described with reference to FIGS. 18 (a) to 18 (c) show the movement of the current transformer portion when it is attached to the circuit to be measured in order. 18A shows a cover-integrated current / voltage measuring instrument in a state before being attached to the covered electric wire 6 which is a circuit to be measured, 26 is a third exterior part, 25 and 31 are core parts, and 32 is a coil part. Show.

  In this cover-integrated current / voltage measuring instrument, the third exterior part 26 is formed of an insulating material in the current transformer part, and the core part 31 and the coil part 32 that are integrally arranged are rotatably arranged. . And when the core part 31 rotates and it becomes a predetermined position, the core part 25 unites with the core part 31 so that the closed magnetic circuit which goes around the circuit to be measured can be formed.

  The operation of the above configuration will be described.

  As shown in FIG. 18B, when the cover-integrated current / voltage measuring instrument is pressed against the covered electric wire 6 of the circuit to be measured, the core portion 31 is rotated inside the third exterior portion 26 by the force. As shown in FIG. 18 (c), a closed magnetic circuit is formed by the core portion 25 so as to surround the covered electric wire 6 as it rotates around the shaft 27. Using this closed magnetic circuit, the current of the circuit under measurement can be easily measured by the current-transforming function of the coil section 32.

  According to said structure, it can use similarly also to the to-be-measured circuit comprised with the copper bar etc.

  Further, the same effect is exhibited not only for the circuit to be measured but also for a single-phase circuit or other circuit devices as well as a three-phase three-wire circuit.

  Although not shown, by providing a needle-shaped voltage detection unit with a sharp tip inside the core unit 31, it is possible to simultaneously measure the voltage of the measured part having a covering unit such as an electric wire.

  Further, the present cover-integrated current / voltage measuring instrument may be configured with only one function of voltage or current. Further, not only the breaker but also a device that is installed in a circuit to be measured and has a connection terminal portion exhibits the same effect.

  In addition, in all the current measuring devices of the above-described Embodiments 2 to 6, the example of measuring the current of the one-phase or two-phase electric circuit has been shown, but leakage current is provided by providing the measuring devices in all phases. In the case of obtaining the electric energy from the measured voltage, it can be calculated more accurately.

  Although not shown in particular, an abnormal state can be measured earlier by incorporating a temperature sensor in the current / voltage measuring instrument. Furthermore, if a thermal fuse is built in, abnormality information can be easily transmitted to the outside by opening and closing the contact circuit.

  Although not shown in the drawings, in each embodiment, the measuring device may include a calculation unit that calculates power, power factor, frequency, and the like from the measured voltage and current information. In addition, by providing current measuring devices for all phases, the leakage current of each phase can be obtained simultaneously in the calculation unit from the measured current information.

  In addition, the measuring instrument includes a storage device such as a memory for storing measured current, voltage, maximum temperature, electric energy obtained by calculation, and integrated electric energy, a numerical display unit for displaying those stored data, or By providing a data output unit that outputs measurement data, calculation data, and the like to the outside, the effects of the present invention can be further enhanced.

  It can be used as a voltage measuring device and a power measuring device using the measured value of the voltage and current in a switchboard, a receiving board, etc., or widely as an electric quantity measuring device.

The perspective view which shows the voltage measuring device in Embodiment 1 of this invention. (A) Conceptual diagram at the time of voltage measurement by the voltage meter in Embodiment 1 of the present invention (b) Schematic diagram of the circuit at the time of phase voltage measurement (c) Schematic diagram of the circuit at the time of phase-to-ground voltage measurement Sectional drawing of the part which fixed the voltage measuring device in Embodiment 1 of this invention to the covered electric wire. The perspective view which shows the current-voltage measuring device in Embodiment 2 of this invention. The perspective view at the time of the current voltage measuring device use in Embodiment 2 of this invention Sectional view of the part where the current / voltage measuring instrument is fixed to the covered wire The figure which shows the other 1st Example of the voltage detection part in Embodiment 2 of this invention. The figure which shows the 2nd Example. (A) First view showing the third embodiment (b) Second view showing the third embodiment The figure which shows the same 4th Example The perspective view which shows the current-voltage measuring device in Embodiment 3 of this invention. The perspective view which shows the electric current measuring device in Embodiment 4 of this invention. First sectional view Second sectional view (A) First sectional view showing a current measuring instrument in the fifth embodiment of the present invention (b) Second sectional view (c) Other examples of the current-voltage measuring instrument in the fifth embodiment of the present invention Cross section showing The perspective view which shows the cover integrated type current-voltage measuring device in Embodiment 6 of this invention. Cross section (A) First sectional view showing current path forming type current transformer by rotation of core part (b) Second sectional view (c) Third sectional view Diagram showing a conventional current / voltage measuring instrument

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Voltage detection part 1a Return prevention burr 6 Covered electric wire 11 Current measurement part 19 Breaker 21 Cover integrated current voltage measuring instrument 22 Holding guide 25, 31 Core part 31a Cut part 30 Voltage detection part 32 Coil part 33 Core fixing part 36 Fixed part

Claims (29)

Measures the voltage of the electric wire by having a conductive voltage detection part, penetrating the end of the voltage detection part through the covered electric wire of the part to be measured and touching the conductive part in the electric wire. Measuring instrument. A measuring instrument having a conductive voltage detection unit and an annular clamp-type current measurement unit, wherein the voltage detection unit is provided on the annular inner surface of the current measurement unit so that the tip is directed inward. The current measurement unit is clamped to the measurement target unit, and the tip of the voltage detection unit penetrates the covered electric wire of the measurement target unit so as to touch the conductive unit in the electric wire, thereby And measuring instrument to measure voltage. The measuring device according to claim 1, wherein the voltage detection unit has a sharp shape and penetrates by covering the covered electric wire. It consists of a flat and deformable core part and a coil part wound around at least a part of the core part, and measures the current of the measured part by surrounding the measured part in an annular shape. A measuring instrument with a current measuring unit. It consists of a flat and deformable core part and a coil part wound around at least a part of the core part, and measures the current of the measured part by surrounding the measured part in an annular shape. A measuring instrument comprising a current measuring unit and a conductive voltage detecting unit, wherein the voltage detecting unit is provided on an annular inner surface of the current measuring unit so that a tip is directed inward, and the current measuring unit is Measurement to measure the current and voltage of the electric wire by surrounding and attaching the covered electric wire of the measurement target portion so that the tip of the voltage detection portion penetrates the electric wire and touches the conductive portion in the electric wire. vessel. The measuring device according to claim 5, wherein the voltage detection unit has a sharp shape and penetrates by protruding a covered electric wire. The current measuring unit includes a belt-like core fixing part having a fixing part that is in contact with the outer peripheral surface of the core part and is detachable at both ends, and the ends of the core fixing part are fixed by the fixing part, and the core part is annular The measuring instrument according to any one of claims 4 to 6, wherein the measuring instrument is fixed to the instrument. A flat core-shaped deformable core, an elastic holding guide that is in contact with the outer peripheral surface of the core and formed in an annular shape, and a coil that is wound around at least a part of the core The core part and the holding guide both have a cut part that can be opened by an external force at substantially the same position of the ring, and insert the part to be measured from the cut part and surround the ring to measure the current of the part to be measured. A measuring instrument with a current measuring unit to measure. The current measuring part is wound around at least a part of the core part, a core part that is deformable in a flat plate shape, a holding guide that has elasticity and forms an annular shape in contact with the outer peripheral surface of the core part The core portion and the holding guide both have a cut portion that can be opened by an external force at substantially the same position of the ring. A measuring instrument comprising a current measuring unit for measuring a current of the measuring unit and a conductive voltage detecting unit, wherein the voltage detecting unit is provided on an annular inner surface of the current measuring unit so that a tip is directed inward. A measuring instrument that measures the current and voltage of the electric wire by surrounding the portion to be measured in an annular shape, such that the tip of the voltage detecting portion penetrates the electric wire and touches the conductive portion in the electric wire. The measuring device according to claim 9, wherein the voltage detection unit has a sharp shape and penetrates by covering the covered electric wire. The measuring instrument according to any one of claims 8 to 10, wherein the holding guide has a portion protruding in a radial direction facing a predetermined interval at a position of the cut portion. A divided core portion and a coil portion wound around at least a part of the core portion, and the measured portion is formed by surrounding the measured portion in an annular shape by the divided core portion and forming the closed magnetic path Measuring instrument with a current measurement unit that measures the current of A divided core portion and a coil portion wound around at least a part of the core portion, and the measured portion is formed by surrounding the measured portion in an annular shape by the divided core portion and forming the closed magnetic path A measuring instrument comprising a current measuring unit for measuring the current of the current and a voltage detecting unit having a conductive and sharp shape, the voltage detecting unit having a tip facing inward on the annular inner surface of the current measuring unit The measured portion is annularly surrounded by the divided core portion, and the tip of the voltage detection portion penetrates the wire and touches the conductive portion in the wire. A measuring instrument that measures current and voltage. The measuring device according to any one of claims 1 to 13, wherein the voltage detection unit has a pointed tip. The measuring instrument according to claim 14, wherein the tip of the voltage detector has a return for preventing it from coming off. The measuring device according to claim 1, wherein the voltage detection unit has a predetermined width and has a blade shape with a thin tip. The measuring instrument according to any one of claims 14 to 16, comprising a plurality of blade portions, at least two of which are opposed in the radial direction. The measuring device according to claim 16, wherein the voltage detection unit is formed with two blade portions facing each other at a predetermined interval. The measuring instrument according to any one of claims 2, 5, 9, and 12, wherein the current measuring unit and the voltage detecting unit are separable. A measuring instrument comprising a voltage detector having a conductive and elastic elastic body, and a ring-shaped clamp-type current measuring unit, wherein the voltage detecting unit has a tip on the annular inner surface of the current measuring unit. It is provided so as to face inward, and the current measuring part is clamped to the conductor of the part to be measured, and the tip of the voltage detecting part is brought into contact with the conductive part. Measuring instrument to measure. The measuring instrument according to any one of claims 1 to 20, wherein the measuring instrument is integrated with a cover of a terminal portion of an electrical device having a connection terminal portion. The measuring instrument according to any one of claims 1 to 21, further comprising an arithmetic unit that calculates at least one of power, power factor, frequency, and leakage current from at least one information of measured voltage and current. The measuring instrument according to claim 22, further comprising storage means for storing measured information or a calculated result. 24. The measuring instrument according to claim 23, wherein the storage means stores an integrated power amount obtained by integrating the calculated power amount. 25. The measuring instrument according to claim 23 or 24, further comprising display means for displaying at least one of the measured or calculated information stored in the storage means. The measuring instrument according to any one of claims 23 to 25, further comprising a data output unit that outputs at least one of measured or calculated information stored in the storage means to the outside. 27. The measuring instrument according to claim 1, wherein a temperature sensor is incorporated. The measuring instrument according to any one of claims 1 to 27, wherein a temperature fuse is incorporated. 28. The measuring instrument according to claim 27, further comprising storage means for storing the measured temperature information and a display unit for displaying the maximum temperature.

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