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JP2012175717A - Watthour meter - Google Patents

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JP2012175717A
JP2012175717A JP2011031899A JP2011031899A JP2012175717A JP 2012175717 A JP2012175717 A JP 2012175717A JP 2011031899 A JP2011031899 A JP 2011031899A JP 2011031899 A JP2011031899 A JP 2011031899A JP 2012175717 A JP2012175717 A JP 2012175717A
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power
unit
power line
power supply
watt
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JP2012175717A5 (en
JP5517966B2 (en
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Hiroshi Shimada
博 嶋田
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Mitsubishi Electric Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02B90/20—Smart grids as enabling technology in buildings sector
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/121—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using the power network as support for the transmission

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  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a watthour meter which eliminates the need for a new space and construction for installing a power supply filter part separately by incorporating a filter part for removing noise from a power supply in a watthour meter part.SOLUTION: The watthour meter including the watthour meter part including an electric power measurement part which measures electric energy consumed by a load connected to a power line and a power supply part which supplies electric power to the electric power measurement part; a power line communication part which communicates using the power line as a transmission line; a separation blocking filter part which separates a signal of power line communication into a power supply side and the load side; and a filter part which is built in the watthour meter part, and removes noises of the power supply part, thereby eliminating the need for the new space for installing the power supply filter part separately.

Description

この発明は、電力量計、特に、電力線を通信線路として通信を行う電力線通信の機能と、この電力線通信の信号を電源側と宅内側に分離する通信信号遮断の機能とを有する電力量計に関するものである。   The present invention relates to a watt-hour meter, and more particularly to a watt-hour meter having a function of power line communication for performing communication using a power line as a communication line and a function of blocking a communication signal for separating a signal of the power line communication from a power source side to a house side. Is.

図４は、例えば特許文献１に示された従来の電力量計を示すブロック図である。図４に於いて、電力量計部３１は、電源側電力線接続端子３３を介して電源側電力線３９に接続されると共に負荷側電力線接続端子３４を介して負荷側電力線４０に接続され、負荷（図示せず）の電力量を計測する。また、電力量計部３１は、電源側電力線３９及び負荷側電力線４０に接続された電力線通信装置３５、３６、３７、３８に接続されており、電力線を通信線路として例えば自動検針の情報を電力会社の検針センターに伝送することができるように構成されている。ブロッキングフィルタ部３２は、電力線通信の信号を電源側と宅内側に分離し、宅内での通信信号が他の場所へ漏洩するのを防止する通信信号遮断の機能を有する。   FIG. 4 is a block diagram showing a conventional watt-hour meter disclosed in Patent Document 1, for example. In FIG. 4, the watt hour meter unit 31 is connected to the power source side power line 39 via the power source side power line connection terminal 33 and is connected to the load side power line 40 via the load side power line connection terminal 34. Measure the amount of power (not shown). The watt-hour meter unit 31 is connected to power line communication devices 35, 36, 37, and 38 connected to the power supply side power line 39 and the load side power line 40. It can be transmitted to the company meter reading center. The blocking filter unit 32 has a communication signal blocking function that separates the power line communication signal into the power supply side and the inside of the house, and prevents the communication signal in the house from leaking to other places.

このように構成された従来の電力量計は、電力線を通信線路として利用して通信を行う電力線通信の機能と、この電力線通信の信号を電源側と宅内側に分離する信号遮断の機能とを有する。   The conventional watt hour meter configured as described above has a power line communication function for performing communication using a power line as a communication line, and a signal blocking function for separating the power line communication signal into a power source side and a house side. Have.

特開２００９−３３８８０号公報（第３図）Japanese Patent Laying-Open No. 2009-33880 (FIG. 3)

前述の従来の電力量計は、電力を計測する電力計測部３１及び電力計測部３１内の電源部から生じるノイズに含まれる周波数成分が電力線通信信号の周波数帯に重なるなどに起因して、電力線通信において通信エラーが発生したり、通信速度が低下するなどの問題があり、これを回避するために、電源部からのノイズを除去するためにフィルタ回路を電力量計の付近（メータボックス等）や外部の各電力線通信装置付近（コンセントボックス等）に設置する必要がある。   The above-mentioned conventional watt-hour meter has a power line due to the fact that the frequency component contained in the noise generated from the power measurement unit 31 that measures power and the power supply unit in the power measurement unit 31 overlaps the frequency band of the power line communication signal. In order to avoid problems such as communication errors occurring in communication or a decrease in communication speed, a filter circuit is installed near the watt hour meter (such as a meter box) to eliminate noise from the power supply unit. Or near each external power line communication device (outlet box, etc.).

しかしながら、住宅のメータボックス等の電力量計付近に十分なスペースがない場合には、前述のフィルタ回路を設置することができない。また、そのフィルタ回路を住宅に電力を供給している線路へ取り付ける場合、停電なしにフィルタ回路を設置しようとすれば非常に工事が煩雑となり、コストがかかるという課題があった。   However, if there is not enough space near the watt hour meter such as a meter box in a house, the above-described filter circuit cannot be installed. Further, when the filter circuit is attached to a line supplying power to a house, there is a problem that if the filter circuit is installed without a power failure, the construction becomes very complicated and the cost is high.

この発明は、従来の電力量計における前述のような課題を解決するためになされたものであり、電源からのノイズを除去するフィルタ部を電力量計部に組み込むことで、別途電源フィルタ部を設置するための新たなスペースや工事を不要とする電力量計を提供することを目的とするものである。   The present invention has been made to solve the above-described problems in the conventional watt-hour meter. A power supply filter section is separately provided by incorporating a filter section for removing noise from the power source into the watt-hour meter section. The purpose is to provide a watt-hour meter that eliminates the need for new space and construction for installation.

この発明による電力量計は、電力線に接続された負荷の消費する電力量を計測する電力計測部と、前記電力計測部に電源を供給する電源部とを備えた電力量計部、前記電力線を伝送路として通信を行なう電力線通信部、前記電力線通信の信号を電源側と前記負荷側とに分離ブロッキングフィルタ部、前記電力量計部に組み込まれ、前記電源部のノイズを除去するフィルタ部を備えたことを特徴とするものである。   An watt-hour meter according to the present invention includes a power meter unit that measures a power amount consumed by a load connected to a power line, a power meter unit that includes a power source unit that supplies power to the power meter unit, and the power line. A power line communication unit that performs communication as a transmission line, a separation blocking filter unit that separates the signal of the power line communication on the power supply side and the load side, and a filter unit that is incorporated in the watt-hour meter unit and removes noise of the power supply unit It is characterized by that.

この発明による電力量計によれば、電力線に接続された負荷の消費する電力量を計測する電力計測部と、前記電力計測部に電源を供給する電源部とを備えた電力量計部、前記電力線を伝送路として通信を行なう電力線通信部、前記電力線通信の信号を電源側と前記負荷側とに分離ブロッキングフィルタ部、前記電力量計部に組み込まれ、前記電源部のノイズを除去するフィルタ部を備えているので、電源フィルタ部を設置するための新たなスペースや工事などが不要となる効果を有する。   According to the watt-hour meter according to the present invention, a watt-hour meter unit including a power measurement unit that measures the amount of power consumed by a load connected to a power line, and a power source unit that supplies power to the power measurement unit, A power line communication unit that performs communication using a power line as a transmission path, a separation blocking filter unit that separates the signal of the power line communication on the power source side and the load side, and a filter unit that removes noise of the power source unit incorporated in the power meter unit Therefore, there is an effect that a new space or construction for installing the power supply filter unit is unnecessary.

この発明の実施の形態１による電力量計を示すブロック図である。It is a block diagram which shows the watt-hour meter by Embodiment 1 of this invention. この発明の実施の形態２による電力量計を示すブロック図である。It is a block diagram which shows the watt-hour meter by Embodiment 2 of this invention. この発明の実施の形態２による電力量計におけるプラグ型ブロッキングフィルタ部の挿抜イメージを示す説明図である。It is explanatory drawing which shows the insertion / extraction image of the plug type blocking filter part in the watt-hour meter by Embodiment 2 of this invention. 従来の電力量計を示すブロック図である。It is a block diagram which shows the conventional watt-hour meter.

実施の形態１．
以下、この発明の実施の形態１による電力量計について詳細に説明する。図１は、この発明の実施の形態１による電力量計を示すブロック図である。図１において、電力量計１０は、電力計測部１１１と電源部１１２と電源フィルタ部１１３とを備えた電力量計部１１と、電源側高インピーダンス部１２１と負荷側高インピーダンス部１２２とを備えたブロッキングフィルタ部１２と、電力線通信部１３とを備えている。電力量計１０は、１Ｓ、２Ｓ、３Ｓからなる電源側端子１４と、１Ｌ、２Ｌ、３Ｌからなる負荷側端子１５を備えたメータボックス内に収納されている。 Embodiment 1 FIG.
Hereinafter, the watt-hour meter according to Embodiment 1 of the present invention will be described in detail. 1 is a block diagram showing a watt-hour meter according to Embodiment 1 of the present invention. In FIG. 1, the watt hour meter 10 includes a watt hour meter unit 11 including a power measuring unit 111, a power source unit 112, and a power source filter unit 113, a power source side high impedance unit 121, and a load side high impedance unit 122. The blocking filter unit 12 and the power line communication unit 13 are provided. The watt-hour meter 10 is housed in a meter box having a power supply side terminal 14 made of 1S, 2S, 3S and a load side terminal 15 made of 1L, 2L, 3L.

電力計測部１１１の電源側端子は、メータボックスの電源側端子１４における１Ｓおよび３Ｓを介して電源側電力線１６のＡ相およびＢ相に接続されている。ブロッキングフィルタ部１２の負荷側端子は、メータボックスの負荷側端子１５における３Ｌおよび１Ｌを介して負荷側電力線１７のＡ相およびＢ相に接続されている。電力計測部１１１のＡ相およびＢ相の負荷側端子は、ブロッキングフィルタ部１２のＡ相およびＢ相の電源側端子に接続されており、これ等の端子は電源側電力線１６および負荷側電力線１７のＡ相およびＢ相に対応する。   The power supply side terminal of the power measuring unit 111 is connected to the A phase and the B phase of the power supply side power line 16 via 1S and 3S in the power supply side terminal 14 of the meter box. The load side terminal of the blocking filter unit 12 is connected to the A phase and the B phase of the load side power line 17 via 3L and 1L in the load side terminal 15 of the meter box. The A-phase and B-phase load-side terminals of the power measuring unit 111 are connected to the A-phase and B-phase power-side terminals of the blocking filter unit 12, and these terminals are the power-side power line 16 and the load-side power line 17. This corresponds to the A phase and the B phase.

電源側端子１４の２Ｓを介して電源側電力線１６の中性線に接続された電源部１１２は、電力計測部１１１に電源を供給する。電力計測部１１１は、電源部１１２からの電源の供給を受けて動作し、負荷（図示せず）の消費する電力量を計測すると共にその計測値を表示する機能を有する。電源フィルタ部１１３は、電源側端子１４の３Ｓを介して電源側電力線１６のＢ相に接続されると共に電源部１１２に接続されており、電源部１１２および電力計測部１１１により発生するノイズを除去し、電力線通信部１３から見た電源部１１２側のインピーダンスの変動を抑えてインピーダンスを高くみせる機能を有する。   The power supply unit 112 connected to the neutral line of the power supply side power line 16 through 2S of the power supply side terminal 14 supplies power to the power measurement unit 111. The power measuring unit 111 operates in response to power supply from the power source unit 112, and has a function of measuring the amount of power consumed by a load (not shown) and displaying the measured value. The power supply filter unit 113 is connected to the B phase of the power supply side power line 16 through 3S of the power supply side terminal 14 and is connected to the power supply unit 112 to remove noise generated by the power supply unit 112 and the power measurement unit 111. In addition, the power line communication unit 13 has a function of suppressing impedance fluctuation on the power supply unit 112 side to increase the impedance.

ブロッキングフィルタ部１２の電源側高インピーダンス部１２１は、電力線通信部１３の通信機能に影響を与えないように、ブロッキングフィルタ部１２の電力線通信部側のインピーダンスを高く見せる機能を有し、負荷側高インピーダンス部１２２は、電力量計１０を設置した建物内に設けられている負荷側電力線通信装置３０が使用されたときに、ブロッキングフィルタ部１２のインピーダンスが建物内の電力線通信装置３０の通信に影響を与えないようにするための高インピーダンス機能を具備する。従って、電力線を伝送路とする電力線通信の通信信号が電力量計１０から遮断される。   The power supply side high impedance unit 121 of the blocking filter unit 12 has a function of making the impedance on the power line communication unit side of the blocking filter unit 12 high so that the communication function of the power line communication unit 13 is not affected. When the load-side power line communication device 30 provided in the building in which the watt hour meter 10 is installed, the impedance unit 122 affects the communication of the power line communication device 30 in the building when the impedance of the blocking filter unit 12 is used. A high impedance function is provided so as not to give the noise. Accordingly, a communication signal for power line communication using the power line as a transmission path is cut off from the watt-hour meter 10.

電力線通信部１３は、通信線１１４を介して電力計測部１１１に接続されると共に、電源側端子１４の１Ｓおよび３Ｓを介して電源側電力線１６のＡ相およびＢ相に接続されている。この電力線通信部１３は、電源側電力線１６を通信線として電源側電力線１６に接続されている電源側電力線通信装置４０との間で通信を行なう機能を有する。   The power line communication unit 13 is connected to the power measurement unit 111 via the communication line 114 and is connected to the A phase and the B phase of the power supply side power line 16 via 1S and 3S of the power supply side terminal 14. The power line communication unit 13 has a function of performing communication with the power supply side power line communication device 40 connected to the power supply side power line 16 using the power supply side power line 16 as a communication line.

ここで、ブロッキングフィルタ部１２の減衰量をＬ［ｄＢ］、負荷側電力線通信装置３０の出力をＺ［ｄＢｍ］、負荷側電力線通信装置３０からブロッキングフィルタ部１２までの減衰量をＡ［ｄＢ］、電力線通信部１３の最低受信感度をＸ［ｄＢｍ］、最低雑音感度比Ｓ／ＮをＹ［ｄＢ］とすると、次式（１）が成立するように設定されている。

Ｌ≧Ｚ−Ａ−Ｘ＋Ｙ ・・・・・・・・・・・・・・・・式（１）
Here, the attenuation amount of the blocking filter unit 12 is L [dB], the output of the load side power line communication device 30 is Z [dBm], and the attenuation amount from the load side power line communication device 30 to the blocking filter unit 12 is A [dB]. When the minimum reception sensitivity of the power line communication unit 13 is X [dBm] and the minimum noise sensitivity ratio S / N is Y [dB], the following equation (1) is established.

L ≧ Z−A−X + Y ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Formula (1)

ブロッキングフィルタ部１２の減衰量Ｌを、式（１）の特性にすることで、電力線通信部１３を用いて行われる電力線通信の信号と負荷側電力線通信装置３０を用いて行われる電力線通信の信号とが、確実に互いに干渉しないように設計することができ、電力線通信の信頼性を更に高めることが可能となり、通信性能を保障することができる。   By setting the attenuation amount L of the blocking filter unit 12 to the characteristic of the expression (1), a signal of power line communication performed using the power line communication unit 13 and a signal of power line communication performed using the load side power line communication device 30 However, it is possible to design so that they do not interfere with each other with certainty, and it becomes possible to further improve the reliability of power line communication and to guarantee the communication performance.

電力計測部１１１により計測した負荷の消費する電力量は、電力計測部１１１の表示部に表示される。また、例えば電力会社若しくは検針センターから光回線等により電力線通信部１３を介して、電力計測部１１１により計測された電力量を自動検針することができる。   The amount of power consumed by the load measured by the power measuring unit 111 is displayed on the display unit of the power measuring unit 111. In addition, for example, the amount of power measured by the power measuring unit 111 can be automatically measured from the power company or meter reading center via the power line communication unit 13 by an optical line or the like.

更に、電源フィルタ部１１３は、電力線通信部１３から見た電源部１１２側のインピーダンスの変動を抑えてインピーダンスを高くみせる機能を有するので、電源部１１２および電力計測部１１１により発生するノイズが除去される。従って、電力計測部１１１及び電源部１１２から生じるノイズに含まれる周波数成分が電力線通信信号の周波数帯に重なるなどに起因して、電力線通信部１３を用いた電力線通信において通信エラーが発生したり、通信速度が低下するなどの問題を回避することができる。   Furthermore, since the power supply filter unit 113 has a function of suppressing impedance fluctuation on the power supply unit 112 side viewed from the power line communication unit 13 to increase the impedance, noise generated by the power supply unit 112 and the power measurement unit 111 is removed. The Therefore, a communication error occurs in the power line communication using the power line communication unit 13 due to the frequency component included in the noise generated from the power measurement unit 111 and the power supply unit 112 overlapping the frequency band of the power line communication signal, etc. Problems such as a decrease in communication speed can be avoided.

一方、ブロッキングフィルタ部１２の電源側高インピーダンス部１２１は、ブロッキングフィルタ部１２の電力線通信部側のインピーダンスを高く見せる機能を有しているので、電力線通信部１３の通信機能に影響を与えることがなく、更に負荷側高インピーダンス部１２２は、負荷側のインピーダンスを高く見せる機能を有するので、ブロッキングフィルタ部１２のインピーダンスが電力量計１０を設置した建物内に接地された電力線通信装置３０を用いた電力線通信に影響を与えることがない。   On the other hand, since the power supply side high impedance part 121 of the blocking filter part 12 has a function of making the impedance on the power line communication part side of the blocking filter part 12 high, it may affect the communication function of the power line communication part 13. Furthermore, since the load side high impedance unit 122 has a function of making the load side impedance high, the power line communication device 30 in which the impedance of the blocking filter unit 12 is grounded in the building where the watt hour meter 10 is installed is used. Does not affect power line communication.

以上述べたこの発明の実施の形態１による電力量計によれば、電源部からのノイズを除去する電源フィルタ部を電力量計部に組み込むようにしているので、電力計量部の電源部から出る雑音が電力線通信部に影響を与えないだけでなく、電源部のインピーダンスの影響も電力線通信部に与えることがないので、従来に比べて電力線通信部の通信性能を向上させることができる。   According to the watt-hour meter according to the first embodiment of the present invention described above, the power filter unit that removes noise from the power source unit is incorporated in the watt-hour meter unit. Not only does the noise not affect the power line communication unit, but also the influence of the impedance of the power supply unit does not affect the power line communication unit, so the communication performance of the power line communication unit can be improved as compared with the conventional case.

更に、電源部からのノイズを除去する電源フィルタ部を電力量計部に組み込むようにしているので、電源フィルタ部を別途設置するための新たなスペースや工事が不要となる効果を有する。   Further, since the power filter unit that removes noise from the power source unit is incorporated in the watt-hour meter unit, there is an effect that a new space and work for separately installing the power filter unit are not required.

また、ブロッキングフィルタ部の電源側が電力量計部の負荷側のＡ相およびＢ相だけに接続され、ブロッキングフィルタ部の負荷側も、負荷側電力線のＡ相およびＢ相だけに接続されている。従って、従来の装置のようにブロッキングフィルタ部がＡ相と中性線との間に１個、およびＢ相と中性線との間に１個夫々接続していた場合に比べ、この発明の実施の形態１による電力量計によれば、ブロッキングフィルタ部を１個入れるだけで従来の装置と同様の効果が得られるため、低コストでブロッキングフィルタ部の機能を実現することができる。   The power supply side of the blocking filter unit is connected only to the A phase and B phase on the load side of the watt-hour meter unit, and the load side of the blocking filter unit is also connected only to the A phase and B phase of the load side power line. Therefore, as compared with the case where one blocking filter portion is connected between the A phase and the neutral wire and one between the B phase and the neutral wire as in the conventional device, the present invention has a According to the watt-hour meter according to the first embodiment, the same effect as that of the conventional device can be obtained by inserting only one blocking filter unit, so that the function of the blocking filter unit can be realized at low cost.

実施の形態２．
図２は、この発明の実施の形態２による電力量計を示すブロック図である。図２において、プラグ型ブロッキングフィルタ部１２３は、電力量計１０内に搭載されたブロッキングフィルタ接続用ジャック１２４にプラグインされることにより、その電源側端子が電力計測部１１１のＡ相およびＢ相の負荷側端子に接続され、負荷側端子がメータボックスの負荷側端子１５の３Ｌ、１Ｌを介して負荷側電力線１７のＡ相およびＢ相に接続されている。 Embodiment 2. FIG.
FIG. 2 is a block diagram showing a watt-hour meter according to Embodiment 2 of the present invention. In FIG. 2, the plug-type blocking filter unit 123 is plugged into the blocking filter connection jack 124 mounted in the watt hour meter 10, so that its power supply side terminals are the A phase and B phase of the power measuring unit 111. The load side terminal is connected to the A phase and the B phase of the load side power line 17 through 3L and 1L of the load side terminal 15 of the meter box.

図３は、この発明の実施の形態２による電力量計におけるプラグ型ブロッキングフィルタ部の挿抜イメージを示す説明図である。図３において、ブロッキングフィルタ接続用ジャック１２４は、一対の電源側接続穴１２４ａ、１２４ｂと、一対の負荷側接続穴１２４ｃ、１２４ｄを備えている。これらの電源側接続穴１２４ａ、１２４ｂ、及び負荷側接続穴１２４ｃ、１２４ｄの内面には導電部が設けられている。   FIG. 3 is an explanatory diagram showing an insertion / removal image of the plug-type blocking filter unit in the watt-hour meter according to Embodiment 2 of the present invention. 3, the blocking filter connection jack 124 includes a pair of power supply side connection holes 124a and 124b and a pair of load side connection holes 124c and 124d. Conductive portions are provided on the inner surfaces of the power supply side connection holes 124a and 124b and the load side connection holes 124c and 124d.

ブロッキングフィルタ接続用ジャック１２４の一方の電源側接続穴１２４ａに設けられた導電部は、電力計測部１１１のＢ相の負荷側端子に接続され、他方の電源側接続穴１２４ｂに設けられた導電部は、電力計測部１１１のＡ相の負荷側端子に接続されている。また、ブロッキングフィルタ接続用ジャック１２４の一方の負荷側接続穴１２４ｃに設けられた導電部は、メータボックスの負荷側端子１５の１Ｌを介して負荷側電力線１７のＢ相に接続され、他方の負荷側接続穴１２４ｄに設けられた導電部は、メータボックスの負荷側端子１５の３Ｌを介して負荷側電力線１７のＡ相に接続されている。   The conductive portion provided in one power supply side connection hole 124a of the blocking filter connection jack 124 is connected to the B-phase load side terminal of the power measuring unit 111, and the conductive portion provided in the other power supply side connection hole 124b. Is connected to the A-phase load side terminal of the power measuring unit 111. Further, the conductive portion provided in one load side connection hole 124c of the blocking filter connection jack 124 is connected to the B phase of the load side power line 17 through 1L of the load side terminal 15 of the meter box, and the other load The conductive portion provided in the side connection hole 124d is connected to the A phase of the load side power line 17 through 3L of the load side terminal 15 of the meter box.

プラグ型ブロッキングフィルタ部１２３は、一対の電源側端子１２３ａ、１２３ｂと、一対の負荷側端子１２３ｃ、１２３ｄを備えている。これらの電源側端子１２３ａ、１２３ｂ、及び負荷側端子１２３ｃ、１２３ｄは、プラグ型ブロッキングフィルタ部１２３の裏面から突出している。   The plug-type blocking filter unit 123 includes a pair of power supply side terminals 123a and 123b and a pair of load side terminals 123c and 123d. These power supply side terminals 123 a and 123 b and load side terminals 123 c and 123 d protrude from the back surface of the plug-type blocking filter portion 123.

このように構成されたプラグ型ブロッキングフィルタ部１２３は、図３に示すように、その電源側端子１２３ａ、１２３ｂ、及び負荷側端子１２３ｃ、１２３ｄが、ブロッキングフィルタ接続用ジャック１２４の夫々対応する電源側接続穴１２４ａ、１２４ｂ、及び負荷側接続穴１２４ｃ、１２４ｄに挿入されることにより、ブロッキングフィルタ接続用ジャック１２４に装着される。   As shown in FIG. 3, the plug-type blocking filter unit 123 configured as described above has power supply side terminals 123 a and 123 b and load side terminals 123 c and 123 d, corresponding to the power supply side corresponding to the blocking filter connection jack 124. By being inserted into the connection holes 124 a and 124 b and the load side connection holes 124 c and 124 d, they are attached to the blocking filter connection jack 124.

電源側接続穴１２４ａ、１２４ｂ、及び負荷側接続穴１２４ｃ、１２４ｄに挿入された電源側端子１２３ａ、１２３ｂ、及び負荷側端子１２３ｃ、１２３ｄは、電源側接続穴１２４ａ、１２４ｂ、及び負荷側接続穴１２４ｃ、１２４ｄに夫々設けられた前述の導電部に接続され、これらの導電部を介して電力計測部１１１の負荷側のＡ相およびＢ相と、負荷側電力線１７のＡ相およびＢ相との間に接続される。   The power supply side connection holes 124a, 124b and the power supply side terminals 123a, 123b and the load side terminals 123c, 123d inserted into the load side connection holes 124c, 124d are the power supply side connection holes 124a, 124b and the load side connection holes 124c. , 124d, connected to the above-described conductive portions, and between these phases, the load-side A-phase and B-phase of the power measuring unit 111 and the A-phase and B-phase of the load-side power line 17 are connected. Connected to.

その他の構成および動作は、実施の形態１による電力量計と同様である。   Other configurations and operations are the same as those of the watt-hour meter according to the first embodiment.

以上述べたこの発明の実施の形態２による電力量計によれば、電源部からのノイズを除去する電源フィルタ部を電力量計部に組み込むようにしているので、電力計量部の電源部から出る雑音が電力線通信部に影響を与えないだけでなく、電源部のインピーダンスの影響も電力線通信部に与えることがないので、従来に比べて電力線通信部の通信性能を向上させることができる。   According to the watt-hour meter according to the second embodiment of the present invention described above, since the power filter unit for removing noise from the power source unit is incorporated in the watt-hour meter unit, the power meter unit exits the power meter unit. Not only does the noise not affect the power line communication unit, but also the influence of the impedance of the power supply unit does not affect the power line communication unit, so the communication performance of the power line communication unit can be improved as compared with the conventional case.

更に、電源部からのノイズを除去する電源フィルタ部を電力量計部に組み込むようにしているので、電源フィルタ部を別途設置するための新たなスペースや工事が不要となる効果を有する。   Further, since the power filter unit that removes noise from the power source unit is incorporated in the watt-hour meter unit, there is an effect that a new space and work for separately installing the power filter unit are not required.

また、ブロッキングフィルタ部の電源側が電力量計部の負荷側のＡ相およびＢ相だけに接続され、ブロッキングフィルタ部の負荷側も、負荷側電力線のＡ相およびＢ相だけに接続されている。従って、従来の装置のようにブロッキングフィルタ部がＡ相と中性線との間に１個、およびＢ相と中性線との間に１個夫々接続していた場合に比べ、この発明の実施の形態１による電力量計によれば、ブロッキングフィルタ部を１個入れるだけで従来の装置と同様の効果が得られるため、低コストでブロッキングフィルタ部の機能を実現することができる。   The power supply side of the blocking filter unit is connected only to the A phase and B phase on the load side of the watt-hour meter unit, and the load side of the blocking filter unit is also connected only to the A phase and B phase of the load side power line. Therefore, as compared with the case where one blocking filter portion is connected between the A phase and the neutral wire and one between the B phase and the neutral wire as in the conventional device, the present invention has a According to the watt-hour meter according to the first embodiment, the same effect as that of the conventional device can be obtained by inserting only one blocking filter unit, so that the function of the blocking filter unit can be realized at low cost.

更に、電力量計１０内にブロッキングフィルタ接続用ジャック１２４を搭載し、プラグ型ブロッキングフィルタ部１２３をこのブロッキングフィルタ接続用ジャック１２４に接続するようにしたので、プラグイン型ブロッキングフィルタ部１２３の交換が簡単になり、電力量計１０の周囲環境や電力線通信のノイズ成分に対応した減衰特性によってプラグイン型ブロッキングフフィルタ部１２３を選定することが可能となる。これにより、ノイズの影響を精度よく抑えることが可能となり、システム全体の通信信頼性を更に高めることが可能となる。また、幅広い周波数に対応した減衰特性を有する高価なブロッキングフィルタを使用する必要がなくなるので、電力量計１０の全体コストを低減させることが可能となる。   Further, since the blocking filter connection jack 124 is mounted in the watt-hour meter 10 and the plug type blocking filter portion 123 is connected to the blocking filter connection jack 124, the plug-in type blocking filter portion 123 can be replaced. The plug-in type blocking filter 123 can be selected based on the attenuation characteristics corresponding to the ambient environment of the watt-hour meter 10 and the noise component of power line communication. As a result, the influence of noise can be suppressed with high accuracy, and the communication reliability of the entire system can be further improved. In addition, since it is not necessary to use an expensive blocking filter having attenuation characteristics corresponding to a wide range of frequencies, the overall cost of the watt-hour meter 10 can be reduced.

１０ 電力量計 １１ 電力量計部
１１１ 電力計測部 １１２ 電源部
１１３ 電源フィルタ部 １１４ 通信線
１２ ブロッキングフィルタ部 １２１ 電源側高インピーダンス部
１２２ 負荷側高インピーダンス部 １３ 電力線通信部
１４ 電源側端子 １５ 負荷側端子
１６ 電源側電力線 １７ 負荷側電力線
４０ 電源側電力線通信装置 ３０ 負荷側電力線通信装置
２０ 分電盤
１２３ ブロッキングフィルタ接続用ジャック
１２３ａ、１２３ｂ 電源側接続端子 １２３ｃ、１２３ｄ 負荷側接続端子
１２４ プラグ型ブロッキングフィルタ部
１２４ａ、１２４ｂ 電源側接続穴 １２４ｃ、１２４ｄ 負荷側接続穴

DESCRIPTION OF SYMBOLS 10 Electricity meter 11 Electricity meter part 111 Electric power measurement part 112 Power supply part 113 Power supply filter part 114 Communication line 12 Blocking filter part 121 Power supply side high impedance part 122 Load side high impedance part 13 Power line communication part 14 Power supply side terminal 15 Load side Terminal 16 Power supply side power line 17 Load side power line 40 Power supply side power line communication device 30 Load side power line communication device 20 Distribution board
123 Blocking filter connection jacks 123a, 123b Power supply side connection terminals 123c, 123d Load side connection terminals 124 Plug type blocking filter portions 124a, 124b Power supply side connection holes 124c, 124d Load side connection holes

Claims (5)

電力線に接続された負荷の消費する電力量を計測する電力計測部と、前記電力計測部に電源を供給する電源部とを備えた電力量計部、
前記電力線を伝送路として通信を行なう電力線通信部、
前記電力線通信の信号を電源側と前記負荷側とに分離ブロッキングフィルタ部、
前記電力量計部に組み込まれ、前記電源部のノイズを除去するフィルタ部、
を備えたことを特徴とする電力量計。 A watt-hour meter unit including a power measuring unit that measures the amount of power consumed by a load connected to the power line, and a power source unit that supplies power to the power measuring unit;
A power line communication unit for performing communication using the power line as a transmission path;
A blocking filter unit that separates the signal of the power line communication into a power supply side and the load side,
A filter unit incorporated in the watt-hour meter unit to remove noise of the power source unit;
A watt hour meter characterized by comprising: 前記ブロッキングフィルタ部は、当該ブロッキングフィルタの電源側のインピーダンスを高くする電源側高インピーダンス部と、前記負荷側のインピーダンスを高くする負荷側高インピーダンス部とを具備する、
ことを特徴とする請求項1に記載の電力量計。 The blocking filter unit includes a power supply side high impedance part for increasing the power supply side impedance of the blocking filter, and a load side high impedance part for increasing the load side impedance.
2. The watt-hour meter according to claim 1, wherein 前記ブロッキングフィルタ部は、前記電力線の２つの相の間にのみ接続されている、
ことを特徴とする請求項１または２に記載の電力量計。 The blocking filter unit is connected only between two phases of the power line,
The watt-hour meter according to claim 1 or 2 characterized by things. 前記ブロッキングフィルタ部は、前記ブロッキングフィルタ部の負荷側に接続された電力線通信装置の出力をＺ、前記負荷側に接続された電力線通信装置から前記ブロッキングフィルタ部までの減衰量をＡ、前記電力線通信部の最低受信感度をＸ、Ｓ／ＮをＹとしたとき、
Ｌ≧Ｚ-Ａ-Ｘ＋Ｙ
を満足する減衰量Ｌを備えている、
ことを特徴とする請求項１乃至３のうちの何れか一項に記載の電力量計。 The blocking filter unit has an output Z of the power line communication device connected to the load side of the blocking filter unit, A represents an attenuation amount from the power line communication device connected to the load side to the blocking filter unit, and the power line communication When the minimum receiving sensitivity of the part is X and S / N is Y,
L ≧ Z−A−X + Y
With an attenuation L that satisfies
The watt-hour meter as described in any one of Claims 1 thru | or 3 characterized by the above-mentioned. 前記ブロッキングフィルタ部は、異なる減衰量を有する別のブロッキングフィルタと交換可能に構成されている、
ことを特徴とする請求項１乃至３のうちの何れか一項に記載の電力量計。
The blocking filter unit is configured to be exchangeable with another blocking filter having a different attenuation amount,
The watt-hour meter as described in any one of Claims 1 thru | or 3 characterized by the above-mentioned.
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