WO2013136408A1 - Wattmètre - Google Patents

Wattmètre Download PDF

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Publication number
WO2013136408A1
WO2013136408A1 PCT/JP2012/056253 JP2012056253W WO2013136408A1 WO 2013136408 A1 WO2013136408 A1 WO 2013136408A1 JP 2012056253 W JP2012056253 W JP 2012056253W WO 2013136408 A1 WO2013136408 A1 WO 2013136408A1
Authority
WO
WIPO (PCT)
Prior art keywords
connection
unit
current
connector
power
Prior art date
Application number
PCT/JP2012/056253
Other languages
English (en)
Japanese (ja)
Inventor
省互 一村
明実 塩川
英昭 永利
西川　誠
雄介 宮村
史迅 大垣
高士 渡邊
Original Assignee
パナソニック株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by パナソニック株式会社 filed Critical パナソニック株式会社
Priority to IN7046DEN2014 priority Critical patent/IN2014DN07046A/en
Priority to PCT/JP2012/056253 priority patent/WO2013136408A1/fr
Priority to CN201280071037.2A priority patent/CN104769445B/zh
Publication of WO2013136408A1 publication Critical patent/WO2013136408A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
    • G01R11/02—Constructional details
    • G01R11/04—Housings; Supporting racks; Arrangements of terminals

Definitions

  • the present invention relates to a power meter that measures power.
  • a multi-circuit watt-hour meter capable of separately measuring the electric energy of a plurality of circuits has been provided (for example, see Japanese Patent Application Publication No. 2005-55404).
  • This multi-circuit watt-hour meter measures the current flowing to the measurement point based on the output of a voltage measurement circuit that measures a common voltage applied to each circuit and a current transformer coupled to the measurement point of each circuit.
  • a plurality of current measurement circuits to be measured, and a power amount calculation processing circuit that calculates a power amount for each circuit based on the voltage measured by the voltage measurement circuit and the current measured by each current measurement circuit.
  • These circuits are mounted on a circuit board and stored in a box-shaped housing.
  • the connectors electrically connected to the respective current measurement circuits are arranged side by side on one side surface of the casing, and the connectors connected to the respective current transformers correspond respectively to the casing side. By connecting to the connector, the current flowing through each circuit can be measured.
  • the present invention has been made in view of the above-described reasons, and an object thereof is to provide a power measuring instrument that can easily determine a connection destination of a current transformer that detects a current to be measured.
  • the power measuring instrument uses a plurality of current measuring units for measuring the current flowing in a circuit to which an electric signal from the current transformer is input and the current transformer is attached, and the power consumption using the measurement result of the current measuring unit And a measuring instrument main body in which at least a plurality of current measuring units and a power calculating unit are accommodated.
  • Each current measurement unit has a plurality of connection parts to which current transformers having different measurement ranges are connected, and the current transformer selected in accordance with the circuit current to be measured is connected to the corresponding connection part.
  • a some connection part is made into one connection group, and the some connection group is divided
  • connection destination can be easily identified, resulting in improved workability. There is an advantage of doing.
  • the plurality of connection groups are arranged in a prescribed number in a plurality of recesses provided in the measuring instrument main body.
  • connection destination can be easily determined when an operator or maintenance inspector connects the current transformer, and as a result There is an advantage that workability is improved.
  • the plurality of connection groups are partitioned by a prescribed number by a partition wall provided in the measuring instrument main body.
  • connection destination can be easily determined when an operator or a maintenance inspector connects the current transformer, and as a result, workability is improved. Has the advantage of improving.
  • an identification unit for identifying each of the connection groups divided into a predetermined number is provided.
  • an operator or a maintenance inspector can easily determine a connection group as a connection destination when connecting a current transformer, and as a result, workability is further improved. There is.
  • each connection group has a connector as a connection portion, and either one of the connector or the connector from the current transformer connected to the connector is provided with an operation portion for releasing the connection state of both connectors. It is also preferable that a display unit as an identification unit is provided in the vicinity of the operation unit.
  • a display unit as an identification unit in the vicinity of the operation unit, it is possible to easily determine a connection group as a connection destination when an operator or a maintenance inspector connects a current transformer. As a result, there is an advantage that workability is further improved.
  • the power meter of the present embodiment includes one main unit 1 and a plurality (two in the present embodiment) of extension units 2.
  • the top, bottom, left, and right directions are defined in the orientation shown in FIG. 1, and the front side in the direction perpendicular to the paper surface of FIG. 1 is defined as the front side and the back side is defined as the rear side.
  • the main unit 1 includes a unit main body (measuring instrument main body) composed of a resin body 11 formed in a rectangular box shape whose front surface is open and a resin cover 12 formed in a rectangular box shape whose rear surface is open. ) 10.
  • a plurality (three in this embodiment) of protrusions 11A are arranged in the left-right direction on the upper side surface and the lower side surface of the body 11, respectively.
  • a long rectangular opening 11B is provided.
  • the electric wire insertion hole 9b of the multiple (4 in this embodiment) screw terminal part 9 accommodated in the unit main body 10 is arranged along with the left-right direction so that the opening part 11B may be faced.
  • These screw terminal portions 9 are connected to either an external power supply line or an earth wire (both not shown).
  • a groove 11E for attaching to an IEC rail (not shown) is provided on the rear surface (back surface) of the body 11, and further, the main unit 1 is removed from the IEC rail below the groove 11E.
  • Two operating rods 6 and 6 to be operated are attached so as to be movable in the vertical direction. Further, on the right side surface of the body 11, groove portions 11 ⁇ / b> D for engaging a connecting piece 21 ⁇ / b> B (described later) provided on the extension unit 2 side are provided at both ends in the vertical direction.
  • the operation rod 6 has a conventionally well-known structure, and detailed description thereof is omitted here.
  • a rectangular protrusion 13 that protrudes forward is integrally provided at the center of the front surface of the cover 12, and an SD memory card (not shown) is provided on the left side of the front surface of the protrusion 13.
  • a slot 13 ⁇ / b> A that is long in the vertical direction is provided so that can be inserted and removed freely.
  • a display unit 5 is provided below the slot 13A to indicate an access state to the SD memory card. Further, on the right side of the slot 13A, a cable connection portion 8 to which a connection cable (not shown) for connecting with a display unit (not shown) is detachably connected and an address of the main unit 1 are set.
  • a dip switch 7 is provided side by side in the left-right direction.
  • a plurality of (four in this embodiment) display units 5 that display, for example, power on / off and the operating state of the apparatus, are arranged in the vertical direction at a portion on the right side of the front surface of the protrusion 13. ing.
  • a plurality of (three in the present embodiment) connectors 3 and a plurality (six in the present embodiment) of screw terminals 4 are accommodated in the upper portion of the cover 12 above the protruding base portion 13 (three in the present embodiment).
  • two recesses 12A are provided side by side in the left-right direction.
  • the connection surface (functional surface) of the connector 3 and the screw terminal part 4 are passed through the rectangular opening part 12E provided in the front side of the recessed part 12A.
  • the terminal screw 4a is exposed, and the wire insertion hole 4b of the screw terminal portion 4 is exposed through a rectangular opening 12D provided on the upper surface of the recess 12A.
  • a plurality of (three in the present embodiment) connectors 3 and a plurality of (six in the present embodiment) screw terminal portions 4 are housed in a portion of the cover 12 below the protrusion 13.
  • the concave portion 12A and a rectangular opening 12B that exposes the terminal screw 9a of the screw terminal portion 9 are provided side by side in the left-right direction.
  • the connection surface (functional surface) of the connector 3 and the screw terminal part 4 are passed through the rectangular opening part 12E provided in the front side of the recessed part 12A.
  • the terminal screw 4a is exposed, and the wire insertion hole 4b of the screw terminal portion 4 is exposed through a rectangular opening 12D provided on the lower surface of the recess 12A. Furthermore, a plurality of (three in this embodiment) holes 12C, which are respectively engaged with the projections 11A on the body 11 side, are provided on the upper and lower sides of the cover 12 side by side. The cover 12 is attached to the body 11 by engaging 11A with the corresponding holes 12C.
  • the extension unit 2 is a unit main body (measuring instrument main body) composed of a resin body 21 formed in a rectangular box shape whose front surface is open and a resin cover 22 formed in a rectangular box shape whose rear surface is open. ) 20.
  • a plurality (two in this embodiment) of protrusions 21A are arranged in the left-right direction on the upper side surface and the lower side surface of the body 21, respectively.
  • a connecting piece 21 ⁇ / b> B that is freely bent is provided.
  • groove portions 21 ⁇ / b> D that are engaged with the connecting pieces 21 ⁇ / b> B are provided at both ends in the vertical direction.
  • a groove 21E for attaching to an IEC rail (not shown) is provided on the rear surface (back surface) of the body 21, and further, when the extension unit 2 is removed from the IEC rail below the groove 21E.
  • An operating rod 6 to be operated is attached so as to be movable in the vertical direction.
  • a rectangular protrusion 23 that protrudes forward is integrally provided at the center of the front surface of the cover 22, and a plurality of (this embodiment) are provided at positions above the protrusion 23 in the cover 22.
  • a plurality of (two in this embodiment) recesses 22A for accommodating the three connectors 3 and a plurality (six in this embodiment) of screw terminal portions 4 are provided side by side in the left-right direction.
  • a plurality (three in the present embodiment) of connectors 3 and a plurality (six in the present embodiment) of screw terminals 4 are accommodated in a portion of the cover 22 below the protrusion 23.
  • a recess 22A is provided.
  • the connection surface (functional surface) of the connector 3 and the screw terminal portion 4 are passed through the rectangular opening 22D provided on the front side of the recess 22A.
  • the terminal screw 4a is exposed, and the wire insertion hole 4b of the screw terminal portion 4 is exposed through a rectangular opening 22B provided on the lower surface of the recess 22A.
  • a plurality of (two in this embodiment) holes 22C which are respectively engaged with the protrusions 21A on the body 21, are provided side by side in the left-right direction on the upper side surface and the lower side surface of the cover 22.
  • the cover 22 is attached to the body 21 by engaging the 21A with the corresponding hole 22C.
  • the extension unit 2 when the extension unit 2 is removed, the engagement state between each projection 21C and the corresponding groove 11D or 21D is released by bending both connecting pieces 21B and 21B toward each other (that is, the vertical direction). Is done. And the extension unit 2 can be removed by moving the extension unit 2 to the right side (direction which leaves
  • the right side surface of the main unit 1, the left side surface of the extension unit 2 arranged at the right end, and the left and right side surfaces of the extension unit 2 arranged in the middle are for supplying power and transmitting electric signals.
  • a connection connector (not shown) is provided. In a state where a plurality of extension units 2 are connected to the main unit 1, power is supplied from the main unit 1 to each extension unit 2, and an electrical signal (for example, a calculation result) is supplied from each extension unit 2 to the main unit 1. Etc.) are transmitted.
  • FIG. 5 is a circuit configuration diagram of a main part of the main unit 1 or the extension unit 2, and actually includes a plurality of current measuring units 14, but each current measuring unit 14 has the same configuration. Only the current measuring unit 14 is illustrated, and the rest are omitted.
  • the main unit 1 and each extension unit 2 include a current measurement unit 14 that measures a current flowing in a circuit to which the current transformer 17A or 17B is attached, a voltage measurement unit 16 that measures a voltage applied to the circuit, and the above And a power calculator 15 for calculating the power consumption of the circuit.
  • the current measuring unit 14 includes a series circuit of a load resistance (for example, 2.0 ⁇ ) 141 and a shunt resistance (for example, 1 m ⁇ ) 142 and an adding circuit 143, and is opposite to one end of the load resistance 141 (a connection point with the shunt resistance 142). Side) is connected to the input terminal of the adder circuit 143.
  • the other end of shunt resistor 142 (the side opposite to the connection point with load resistor 141) is connected to ground GND.
  • the connector 3 is connected to a current transformer 17A having a relatively low detection current
  • the screw terminal portion 4 is connected to a current transformer 17B having a relatively high detection current. That is, the current transformers 17A and 17B having different measurement ranges are connected to the connector 3 and the screw terminal portion 4, respectively.
  • the power calculation unit 15 calculates power consumption based on the current value measured by the current measurement unit 14 and the voltage value measured by the voltage measurement unit 16, and the calculation result by the extension unit 2, for example, is transmitted via the connection connector. To the main unit 1.
  • connection portions are constituted by the connector 3 and the screw terminal portion 4, and further, one connection group is constituted by the one connector 3 and the two screw terminal portions 4. Then, three (specified number) of connection groups are arranged for each recess 12A of the cover 12 or each recess 22A of the cover 22 (see FIG. 1).
  • FIG. 6A is an enlarged view of a main part showing another example of the power measuring instrument of the present embodiment.
  • a plurality of connection groups are partitioned for each specified number by the partition walls 12F or 22F provided in the unit main body 10 or 20.
  • Other configurations are the same as those of the above-described power meter, and the same components are denoted by the same reference numerals and description thereof is omitted.
  • the power measuring instrument of this example is a main unit 1 having a unit main body (measuring instrument main body) 10 constituted by a body (not shown) and a cover 12, and a unit constituted by a body (not shown) and a cover 22.
  • an extension unit 2 having a main body (measuring instrument main body) 20.
  • the cover 12 of the main unit 1 and the cover 22 of the extension unit 2 are partitioned so as to surround a specified number (three in this example) of connection groups (one connector 3 and two screw terminal portions 4 in this example).
  • a wall 12F or 22F is provided.
  • 6A is an enlarged view of the main part of the power meter, so that only one partition wall 12F or 22F is shown, but actually a plurality of partition walls 12F or 22F are provided.
  • a plurality of connection groups are partitioned by a prescribed number by each partition wall 12F or 22F.
  • labels are attached to each connection group so that each connection group can be identified by this label. It has become. Thereby, when an operator or a maintenance inspector connects the current transformer 17A or 17B, each connection group can be easily distinguished, and as a result, there is an advantage that workability is further improved.
  • the label which comprises an identification part is not limited to a number, A character etc. may be sufficient.
  • each connection group may be color-coded, or a partition wall may be provided between each connection group for identification.
  • FIG. 6B is a schematic diagram of the connector 18 on the current transformer 17A side that is plugged into the connector 3 included in the power measuring instrument of the present embodiment.
  • the connector 18 is made of, for example, a synthetic resin molded product, and is integrally provided with an elastic piece 18d that is movably displaced in the vertical direction.
  • a protrusion 18b is provided at the tip of the elastic piece 18d so as to be engaged with a groove (not shown) on the connector 3 side when the connector 18 is inserted into the connector 3, and is inserted into the connector 3 at the rear end.
  • a protrusion 18a that is operated when the connected connector 18 is removed is provided.
  • the projection 18 a When removing the connector 18 inserted and connected to the connector 3, the projection 18 a is pushed to release the engagement state between the projection 18 b and the groove, and the connector 18 is pulled out in this state to remove the connector 18. Can do.
  • a display unit (numeral 1 in this example) 18c is provided in the vicinity of the elastic piece 18d, so that a connection group that becomes a connection destination when an operator or a maintenance inspector connects the current transformer 17A can be selected. There is an advantage that it can be easily discriminated and as a result, workability is further improved.
  • the operation portion is configured by the protrusion 18a provided on the elastic piece 18d.
  • the power measuring instrument is configured by one main unit 1 and two extension units 2, but the configuration of the power measuring instrument is not limited to the present embodiment, and only the main unit 1 is configured.
  • a power meter may be configured, or one or more extension units 2 may be added to the main unit 1 to configure a power meter.
  • the case where the power distribution method is a three-phase four-wire system is described as an example. In this case, it is necessary to detect currents of the U phase, the V phase, and the W phase. However, for example, when the power distribution system is a single-phase three-wire system, the current for two phases may be detected, and the prescribed number is two. That is, the specified number is not limited to this embodiment, and can be set arbitrarily. Then, by arranging the plurality of connection groups in a predetermined number, the connection destination can be easily determined when an operator or a maintenance inspector connects the current transformer.
  • the display portion 18c of the connector 18 is a number has been described as an example, but the display portion may be configured with, for example, characters and colors, and is not limited to the present embodiment.
  • the display part is provided in the connector side of the current transformer, you may provide a display part in the connector side with which an electric power measuring device is provided.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Connections Arranged To Contact A Plurality Of Conductors (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)

Abstract

La présente invention concerne un wattmètre doté d'une unité principale (1) et d'une pluralité d'unités d'extension (2). L'unité principale (1) possède un corps unitaire (10) doté d'une pluralité de creux (12A) dans lesquels une pluralité de connecteurs (3) et une pluralité de bornes à vis (4) sont logées. Chaque unité d'extension (2) possède un corps unitaire (20) doté d'une pluralité de creux (22A) dans lesquels une pluralité de connecteurs (3) et une pluralité de bornes à vis (4) sont logées. Dans ce wattmètre, du fait que la pluralité de connecteurs (3) et la pluralité de bornes à vis (4) sont disposées séparément dans les creux (12A ou 22A), il est facile de déterminer le point de connexion lorsqu'un ouvrier ou un agent de maintenance connecte un transformateur de courant, ce qui améliore l'opérabilité.
PCT/JP2012/056253 2012-03-12 2012-03-12 Wattmètre WO2013136408A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
IN7046DEN2014 IN2014DN07046A (fr) 2012-03-12 2012-03-12
PCT/JP2012/056253 WO2013136408A1 (fr) 2012-03-12 2012-03-12 Wattmètre
CN201280071037.2A CN104769445B (zh) 2012-03-12 2012-03-12 功率表

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2012/056253 WO2013136408A1 (fr) 2012-03-12 2012-03-12 Wattmètre

Publications (1)

Publication Number Publication Date
WO2013136408A1 true WO2013136408A1 (fr) 2013-09-19

Family

ID=49160382

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2012/056253 WO2013136408A1 (fr) 2012-03-12 2012-03-12 Wattmètre

Country Status (3)

Country Link
CN (1) CN104769445B (fr)
IN (1) IN2014DN07046A (fr)
WO (1) WO2013136408A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000200654A (ja) * 1999-01-06 2000-07-18 N T T Telecom Eng Tokyo:Kk 人間の感覚に訴えて誤接続及び誤操作を防止する装置
JP2005055404A (ja) * 2003-08-07 2005-03-03 Matsushita Electric Works Ltd 多回路電力量計及び多回路電力量計の増設ユニット

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5572862A (en) * 1978-11-28 1980-06-02 Toshiba Corp Electronic watt-hour meter

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000200654A (ja) * 1999-01-06 2000-07-18 N T T Telecom Eng Tokyo:Kk 人間の感覚に訴えて誤接続及び誤操作を防止する装置
JP2005055404A (ja) * 2003-08-07 2005-03-03 Matsushita Electric Works Ltd 多回路電力量計及び多回路電力量計の増設ユニット

Also Published As

Publication number Publication date
IN2014DN07046A (fr) 2015-04-10
CN104769445B (zh) 2017-02-22
CN104769445A (zh) 2015-07-08

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