WO2015159354A1 - 電力量計用端子装置及び電力量計 - Google Patents
電力量計用端子装置及び電力量計 Download PDFInfo
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- WO2015159354A1 WO2015159354A1 PCT/JP2014/060659 JP2014060659W WO2015159354A1 WO 2015159354 A1 WO2015159354 A1 WO 2015159354A1 JP 2014060659 W JP2014060659 W JP 2014060659W WO 2015159354 A1 WO2015159354 A1 WO 2015159354A1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
Definitions
- the present invention relates to a watt-hour meter terminal device and a watt-hour meter including the terminal device.
- a screw terminal device includes a terminal fitting having a hole for inserting a wire to be fixed, a fixing screw for fixing the wire, and a terminal block for fixing the terminal fitting.
- the terminal device of the press screw type is a terminal fitting having a hollow rectangular cross section, a fixing screw for moving the terminal fitting up and down and fixing it at an arbitrary position, a metal plate for fixing an electric wire, a terminal fitting and a metal plate It is comprised from the terminal block which fixes.
- the terminal device of the conventional watt-hour meter corresponds to either the screwing method or the press screw method.
- the components for both fixed methods are not compatible, and equipment for manufacturing two types of terminal devices must be possessed. There was a problem.
- the fixing method by a press screw system becomes large with respect to the direction in which a terminal device moves a fixing screw. Therefore, when the press screw method is adopted for the watt hour meter, the whole watt hour meter becomes large, and there is a problem that the installation space for the watt hour meter has to be increased.
- the present invention has been made in order to solve the above-described problems, and provides a watt-hour terminal device capable of supporting both a screwing method and a press screw method, and a watt-hour meter including the terminal device. It is intended.
- the present invention has a wire insertion hole into which an electric wire is inserted at one end, and a terminal having a metal plate fixing hole into which the metal plate connected to the watt hour meter body is inserted opposite to the electric wire insertion hole at the other end And a terminal bracket having a hollow rectangular cross section between the wire insertion hole and the metal plate fixing hole of the terminal block so as to be movable in the vertical direction perpendicular to the metal plate fixing hole,
- the terminal metal fitting is provided as the metal plate fixing hole in the terminal block.
- the upper and lower fixing holes are provided at a predetermined interval in the moving vertical direction, and the electric wire is clamped and fixed between the fixing screw and the metal plate when the metal plate is inserted into the lower fixing hole. And the metal plate is fixed to the upper part. In the inserted state, in which the electric wire was set to be clamped fixed between the terminal fitting and the metal plate.
- the terminal device for watt-hour meter of the present invention it is possible to correspond to the screwing method and the press screw method, and two kinds of fixing methods with one kind of terminal device without increasing the whole watt-hour meter. Can be realized.
- FIG. 1 It is a front view of the watt-hour meter which shows Embodiment 1 of this invention. It is a perspective view which shows the terminal device for watt-hour meters concerning Embodiment 1 of this invention. It is sectional drawing which shows the terminal device for watt-hour meters concerning Embodiment 1 of this invention. It is a perspective view which shows an example of the terminal device for watt-hour meters which fixed the electric wire in Embodiment 1 of this invention. It is sectional drawing which shows the principal part of the terminal device for watt-hours corresponding to FIG. It is sectional drawing which shows the terminal device for watt-hours corresponding to FIG.
- FIG. 1 It is a perspective view which shows the other example of the terminal device for watt-hours which fixed the electric wire in Embodiment 1 of this invention. It is sectional drawing which shows the principal part of the terminal device for watt-hours corresponding to FIG. It is sectional drawing which shows the terminal device for watt-hours corresponding to FIG.
- Embodiment 1 FIG. As shown in FIG. 1, a three-phase four-wire watt-hour meter 100 is attached to a watt-hour meter body 10 including a metering device for measuring and displaying the power amount, and a lower end of the watt-hour meter body 10. It is comprised from the terminal device 20 provided with the terminal.
- the watt-hour meter body 10 includes current transformers 11a, 11b, and 11c that measure current, and a metering unit that measures the amount of power from phase currents and line voltages measured by the current transformers 11a, 11b, and 11c (see FIG. And a display unit (not shown) for displaying the amount of power measured by the measuring unit.
- the terminal device 20 is provided with primary side terminals 21a, 21b, 21c, and 21d to which lead-in lines from the power transmission system are connected, and secondary side terminals 22a, 22b, 22c, and 22d to which customer side wiring is connected. ing.
- the primary side terminals 21a, 21b, and 21c are connected to the relay terminals 15a, 15b, and 15c of the open / close relay 14 through the conductor plates 12a, 12b, and 12c in the watt hour meter body 10.
- the secondary side terminals 22a, 22b, and 22c pass through the insides of the current transformers 11a, 11b, and 11 by the conductor plates 13a, 13b, and 13c in the watt hour meter body 10, and the relay terminals 16a, 16b. , 16c. Since the N-phase is connected to the primary side terminal 21 d, the primary side terminal 21 d is connected to the secondary side terminal 22 d by the short bar 17 inside the terminal device 20.
- the terminal device 20 is integrally provided so as to constitute the bottom portion of the watt-hour meter main body 10.
- the terminal device 20 has an electric wire insertion hole 24 into which an electric wire is inserted at one end corresponding to the number of primary side terminals 21a, 21b, 21c, 21d and secondary side terminals 22a, 22b, 22c, 22d,
- a terminal block 23 having upper and lower fixing holes 25 and 26 into which a metal plate 29 is inserted is provided at the other end so as to face the electric wire insertion hole 24.
- the terminal block 23 is formed in an oblong shape with an insulating material such as a synthetic resin, and a partition is provided so as to separate the primary side terminal and the secondary side terminal of each phase.
- a terminal metal fitting 27 having a hollow rectangular cross section is perpendicular to the electric wire insertion hole 24 and the upper and lower fixing holes 25, 26 between the electric wire insertion hole 24 and the upper and lower fixing holes 25, 26. It is accommodated and held so as to be movable in the vertical direction, and two fixing screws 28 are attached to the upper part of the terminal fitting 27. These fixing screws 28 enter the hollow interior of the terminal fitting 27 by tightening, and retreat by loosening. As will be described later, the metal plate 29 is inserted into the upper fixing hole 25 or the lower fixing hole 26 and fixed to the terminal block 23. The metal plate 29 is fixed to the terminal block 23 by, for example, press fitting into the upper fixing hole 25 or the lower fixing hole 26 or a screw (not shown).
- Conductor plates 12a to 12b and 13a to 13c are attached to the ends of the metal plate 29, and both are fixed by a conductor plate fixing screw 30.
- the conductor plates 13a, 13b, 13c pass through the current transformers 11a, 11b, 11c and are fixed to the open / close relay 14.
- the metal plate 29 corresponding to the primary side terminal 21 d and the secondary side terminal 22 d is not connected to the open / close relay 14 and is short-circuited by the short bar 17.
- the upper and lower fixing holes 25 and 26 are formed in the terminal block 23 at predetermined intervals so as to correspond to the vertical movement direction of the terminal fitting 27, and the primary side terminals of each phase And the number corresponding to the number of secondary side terminals.
- the conductor plate 13b connected to the metal plate 29 is provided with a crank having a displacement in the vertical direction as shown in FIG. 6, and the conductor plate 13b is located at a distance from the bottom surface of the watt hour meter body 10 to the current transformer 11b. After being penetrated at a position separated by L, it is fixed by a fixing plate 30 and a metal plate 29 that is displaced downward and inserted into the lower fixing hole 26.
- the watt hour meter using the present invention can correspond to the screw-type wire fixing method.
- the terminal fitting 27 is movable up and down as long as the inner surface does not contact the metal plate 29 as shown in FIGS. 8 and 9. Become.
- the terminal fitting 27 is movable up and down, so after the fixing screw 28 is brought into contact with the metal plate 29 by tightening.
- the terminal fitting 27 is raised according to the tightening amount of the fixing screw 28. For this reason, the electric wire 18 is clamped and fixed between the lower surface of the metal plate 29 and the bottom surface of the terminal fitting 27 as shown in FIG. Therefore, in this case, a wire fixing method similar to the conventional press screw method is realized.
- the upper and lower sides of the conductor plate 13b are opposite to those in FIG. 6, that is, the conductor plate 13b penetrates the current transformer 11b at a position away from the bottom surface of the wattmeter main body 10 by the distance L. Then, the metal plate 29 and the fixing screw 30 are fixed by being displaced upward and inserted into the upper fixing hole 25. In this way, regardless of whether the metal plate 29 is inserted into the upper fixing hole 25 or the lower fixing hole 26, the conductor plate 13 b causes the current transformer 11 b to move the current transformer 11 b from the bottom surface of the wattmeter main body 10 by a constant distance L. It is possible to penetrate at a position separated by only From the description using FIGS. 6 and 9, it is clear that the crank displacement amount of the conductor plate 13 b is determined by the relationship between the distance L between the upper and lower fixing holes 25 and 26 and the distance L. .
- the conductor plates 13a, 13b, and 13c that respectively penetrate the current transformers 11a, 11b, and 11c are provided with cranks that are displaced in the vertical direction corresponding to the distance between the upper and lower fixing holes 25 and 26 of the terminal device 20. Therefore, even if the metal plate 29 is inserted into either the upper fixing hole 25 or the lower fixing hole 26 of the terminal block 23, the positions of the conductor plates 13a, 13b, 13c are relative to the current transformers 11a, 11b, 11c. Therefore, the current measurement accuracy of the current transformer can be improved.
- 10 Power meter body 11a, 11b, 11c Current transformer, 12a, 12b, 12c conductive plate, 13a, 13b, 13c conductive plate, 14 open / close relay, 15a, 15b, 15c relay terminal, 16a, 16b, 16c Relay terminal, 17 Short bar, 18 wires, 20 terminal devices, 21a, 21b, 21c, 21d primary side terminals, 22a, 22b, 22c, 22d secondary side terminals, 23 terminal block, 24 wire insertion hole, 25 upper fixing hole, 26 Lower fixing hole, 27 Terminal fitting, 28 Fixing screw, 29 metal plate, 30 conductor plate fixing screw, 100 watt-hour meter.
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Abstract
Description
電線を端子金具の穴に挿入し、固定用ネジを締結することで電線が端子金具と固定用ネジの先端に挟み込まれ、固定される(例えば、特許文献1参照)。
電線を金属板下面と端子金具の間の空間に挿入し、固定用ネジを締結すると端子金具が上昇し、金属板と端子金具で電線が挟み込まれ、固定される(例えば、特許文献2参照)。
両固定方式の構成部品に互換性が無く、向け先電力会社の要求に応じてどちらかの方式に対応した端子装置を製造するため、2種類の端子装置を製造する設備を保有しなければならないという問題があった。
従って、電力量計にプレススクリュー方式を採用すると電力量計全体が大きくなり、電力量計の設置スペースを大きくしなければならないという問題もあった。
図1に示すように、三相4線式の電力量計100は、電力量を計測し表示する計量装置を含む電力量計本体10と、この電力量計本体10の下端に取り付けられ、外部端子が設けられた端子装置20とから構成されている。
同様に、二次側端子22a、22b、22cは、電力量計本体10内で、導体板13a、13b、13cにより、変流器11a、11b、11の内部を貫通してリレー端子16a、16b、16cに接続されている。
一次側端子21dは、N相が接続されるため、端子装置20の内部にて、ショートバー17により二次側端子22dに接続される。
端子装置20は、一次側端子21a、21b、21c、21dと、二次側端子22a、22b、22c、22dの数に対応して、一端に電線が挿入される電線挿入穴24を有し、他端に電線挿入穴24と対向して金属板29が挿入される上部及び下部固定穴25、26を有する端子台23を備えている。
なお、端子台23は、合成樹脂等の絶縁材により横長に形成され、各相の一次側端子及び二次側端子間を分離するように隔壁が設けられている。
これらの固定用ネジ28は、締めることで端子金具27の中空の内部に進入し、緩めることで後退するものである。
金属板29は、後述するように上部固定穴25または下部固定穴26に挿入され、端子台23に固定される。
金属板29の端子台23への固定は、例えば、上部固定穴25または下部固定穴26への圧入や図示しないネジにより行われる。
導体板13a、13b、13cは、変流器11a、11b、11cの内部を通過して開閉リレー14に固定される。
一次側端子21dと二次側端子22dに対応する金属板29は開閉リレー14に接続されず、ショートバー17により短絡される。
すなわち、電線18を端子装置20の電線挿入穴24に挿入して固定用ネジ28を締めて下降させると、電線18は金属板29の上面と固定用ネジ28の下端部に挟まれて固定される。
つまり、従来のネジ止め方式と同様の電線固定方法が実現される。
電線18を端子台23の電線挿入穴24に挿入して固定用ネジ28を締めると、端子金具27は上下に可動状態にあるため、固定用ネジ28が締めつけによって金属板29と接触した後は、固定用ネジ28の締めつけ量に合わせて端子金具27が上昇する。
このため、電線18は、図8のように金属板29の下面と端子金具27の底面で挟持され固定される。
従って、この場合には、従来のプレススクリュー方式と同様の電線固定方法が実現される。
このようにすれば、金属板29が上部固定穴25または下部固定穴26のいずれに挿入されていても、クランクによって導体板13bは変流器11bを電力量計本体10の底面から一定距離Lだけ離れた位置で貫通することができる。
図6、図9を用いた説明から、導体板13bのクランクの変位量は、上部及び下部固定穴25、26間の距離と距離Lとの関係によって決定されるものであることは明らかである。
また、変流器11a、11b、11cをそれぞれ貫通する導体板13a、13b、13cに、端子装置20の上部及び下部固定穴25、26の間隔に対応して上下方向に変位したクランクが設けられているので、金属板29を端子台23の上部固定穴25、下部固定穴26のいずれに挿入しても、導体板13a、13b、13cの位置が、変流器11a、11b、11cに対して変わらないので、変流器の電流計測精度を向上させることができる。
12a、12b、12c 導体板、13a、13b、13c 導体板、
14 開閉リレー、15a、15b、15c リレー端子、
16a、16b、16c リレー端子、17 ショートバー、
18 電線、20 端子装置、
21a、21b、21c、21d 1次側端子、
22a、22b、22c、22d 2次側端子、
23 端子台、24 電線挿入穴、25 上部固定穴、
26 下部固定穴、27 端子金具、28 固定用ネジ、
29 金属板、30 導体板固定ネジ、100 電力量計。
Claims (5)
- 一端に電線が挿入される電線挿入穴を有し、他端に前記電線挿入穴と対向して電力量計本体と接続される金属板が挿入される金属板固定穴を有する端子台を備え、
前記端子台の前記電線挿入穴と前記金属板固定穴との間に、中空の長方形断面を有する端子金具を前記金属板固定穴と直交する上下方向に移動可能に保持すると共に、
前記端子金具に設けられた固定用ネジにより、前記金属板を介して前記電線と前記電力量計本体とを接続する端子装置において、
前記端子台に、前記金属板固定穴として、前記端子金具が移動する前記上下方向に所定の間隔をおいて上部及び下部固定穴を設け、
前記金属板が前記下部固定穴に挿入された状態では、前記電線を前記固定用ネジと前記金属板とで挟持固定し、
前記金属板が前記上部固定穴に挿入された状態では、前記電線を前記金属板と前記端子金具とで挟持固定するようにした
ことを特徴とする電力量計用端子装置。 - 前記金属板が前記下部固定穴に挿入された状態では、前記電線を前記固定用ネジの下端部と前記金属板の上面とで挟持固定し、
前記金属板が前記上部固定穴に挿入された状態では、前記電線を前記金属板の下面と前記端子金具の底面とで挟持固定するようにした
ことを特徴とする請求項1に記載の電力量計用端子装置。 - 前記電線挿入穴、前記上部及び下部固定穴、前記端子金具は、接続される前記電線の数に対応して前記端子台に複数個並列に設けられていることを特徴とする請求項1または2に記載の電力量計用端子装置。
- 請求項1から3のいずれか1項に記載の電力量計用端子装置を備え、前記金属板を導体板を介して前記電力量計本体に接続するようにしたことを特徴とする電力量計。
- 前記導体板は電流を計測する変流器を貫通すると共に、前記上部及び下部固定穴の間隔に対応して前記上下方向に変位したクランクを有することを特徴とする請求項4に記載の電力量計。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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PCT/JP2014/060659 WO2015159354A1 (ja) | 2014-04-15 | 2014-04-15 | 電力量計用端子装置及び電力量計 |
PL419163A PL228567B1 (pl) | 2014-04-15 | 2014-04-15 | Urządzenie zaciskowe licznika energii elektrycznej |
JP2014542616A JP5676830B1 (ja) | 2014-04-15 | 2014-04-15 | 電力量計用端子装置及び電力量計 |
CN201480078001.6A CN106233148A (zh) | 2014-04-15 | 2014-04-15 | 电量计用端子装置及电量计 |
TW103121144A TWI582436B (zh) | 2014-04-15 | 2014-06-19 | 電量計用端子裝置及電量計 |
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PCT/JP2014/060659 WO2015159354A1 (ja) | 2014-04-15 | 2014-04-15 | 電力量計用端子装置及び電力量計 |
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CN (1) | CN106233148A (ja) |
PL (1) | PL228567B1 (ja) |
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JP2021152458A (ja) * | 2020-03-24 | 2021-09-30 | 富士電機メーター株式会社 | 電力量計の筐体ベース及び電力量計 |
JP7561257B1 (ja) | 2023-11-02 | 2024-10-03 | 大崎電気工業株式会社 | スマートメータ |
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CN105699720B (zh) * | 2016-04-27 | 2018-11-27 | 江苏源清环保科技有限公司 | 一种可调电表固定装置及其使用方法 |
CN107688108B (zh) * | 2017-08-24 | 2023-09-05 | 国网江苏省电力有限公司宝应县供电分公司 | 一种电表的接线组件 |
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- 2014-04-15 JP JP2014542616A patent/JP5676830B1/ja active Active
- 2014-04-15 WO PCT/JP2014/060659 patent/WO2015159354A1/ja active Application Filing
- 2014-04-15 CN CN201480078001.6A patent/CN106233148A/zh active Pending
- 2014-04-15 PL PL419163A patent/PL228567B1/pl unknown
- 2014-06-19 TW TW103121144A patent/TWI582436B/zh not_active IP Right Cessation
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JP2021152458A (ja) * | 2020-03-24 | 2021-09-30 | 富士電機メーター株式会社 | 電力量計の筐体ベース及び電力量計 |
JP7437844B2 (ja) | 2020-03-24 | 2024-02-26 | 富士電機メーター株式会社 | 電力量計の筐体ベース及び電力量計 |
JP7561257B1 (ja) | 2023-11-02 | 2024-10-03 | 大崎電気工業株式会社 | スマートメータ |
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TWI582436B (zh) | 2017-05-11 |
PL419163A1 (pl) | 2017-06-19 |
JP5676830B1 (ja) | 2015-02-25 |
JPWO2015159354A1 (ja) | 2017-04-13 |
CN106233148A (zh) | 2016-12-14 |
PL228567B1 (pl) | 2018-04-30 |
TW201538987A (zh) | 2015-10-16 |
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