JP3540778B2

JP3540778B2 - Total power measurement method for specific load and total power measurement device for specific load

Info

Publication number: JP3540778B2
Application number: JP2001191814A
Authority: JP
Inventors: 直也山田
Original assignee: Mitsubishi Electric Building Techno Service Co Ltd
Current assignee: Mitsubishi Electric Building Solutions Corp
Priority date: 2001-06-25
Filing date: 2001-06-25
Publication date: 2004-07-07
Anticipated expiration: 2021-06-25
Also published as: JP2003004778A

Description

【０００１】
【発明の属する技術分野】
本発明は、複数の同種類の特定負荷に配電盤を介して電力が供給されている場合に、特定負荷における全電力の測定方法および測定装置に関する。
【０００２】
【従来の技術】
工場、事務所、家庭などにおいては、さまざまの電気機器が設置されていて、省エネルギーを図るために、ある特定のシステムを新しいシステムに変更することが行なわれる。この場合に、この特定のシステム変更により省エネルギー効果を評価するために特定負荷の電力測定が必要になる。例えばある工場で照明器具を従来の標準的な蛍光灯システムから、外光の明るさに応じて灯りの明るさを自動的に調整するインバータ方式調光機能の高周波ランプ（Ｈｆランプ）に全面変更したときにその省エネルギー効果を評価したい場合などである。このようなときは、一般に配電盤において、電力アナライザを用いつつ、特定負荷の電力を測定して、システム変更の前後における特定負荷の電力の変化を見れば良い。
【０００３】
図４は、配電盤が、コンセント負荷（いわゆる単相１００Ｖ交流負荷）と、照明負荷（いわゆる単相２００Ｖ交流負荷）の２種類用の簡単な場合について、従来例の特定負荷の電力測定状況を示したものである。配電盤１には外部よりＲ相、Ｎ相、Ｔ相の電力線が引き込まれ、配電盤内部にそれぞれＲ相主幹線２、Ｎ相主幹線３、Ｔ相主幹線４の導体（銅帯とも呼ばれる）がおおむね図４のように３列に配設され、Ｎ相は負荷と接続しやすいように主幹線末端部６をもつ。外部から引き込まれたＲ相、Ｎ相、Ｔ相の電力線との間には主幹ブレーカ５が設けられる。図４の一点鎖線より上側に照明負荷１１、１２、１３および２１、２２、２３がこのＲ相−Ｔ相間に設置される。１４、１５、１６および２４、２５、２６はそれぞれの分岐ブレーカである。図４の一点鎖線より下側部分のＲ相−Ｎ相間およびＴ相−Ｎ相間にコンセント負荷３１、３２、３３および４１、４２、４３がここに設置され、その分岐ブレーカ３４、３５、３６および４４、４５、４６が設けられる。クランプＣＴ５１、５２、５３および５４、５５、５６が、照明負荷１１、１２、１３および２１、２２、２３のＲ相−Ｔ相間電流路に対応して設置され、それぞれ別々の合計６台の電力アナライザ（図示してない）の電流入力端子に結ばれる。また電力アナライザの電圧入力端子と、Ｒ相主幹線２、Ｔ相主幹線４が例えばワニぐちクリップなどで接続される。
【０００４】
この場合の従来例の電力測定方法について説明する。多くの場合、Ｎ相導体はＢ種接地電位にあり、これに対してＲ相導体、Ｔ相導体は約１０５Ｖの交流電圧で充電されている。したがってＲ相−Ｔ相間電圧は約２１０Ｖとなっており、分岐ブレーカ１４等が接続側に倒されているときは、照明負荷は約２１０Ｖの単相交流電力が供給される。これに対してＲ相−Ｎ相間、Ｔ相−Ｎ相間は約１０５Ｖであり、分岐ブレーカ３４等が接続側に倒されているときは、コンセント負荷３１等に約１０５Ｖの単相交流電力が供給される。このような配電盤１において照明負荷全体の電力を測定するには、クランプＣＴ５１から５６を用いて電力アナライザによって測定される。クランプＣＴとは、電流の流れている電線を切断せずにその電流を測定する機器であり、一般的に言えば電流変成器の２次巻線として動作する挟み試験具であって、リング状鉄心の一部を開閉できるようにし、電線をリングの中に通す。鉄心にはコイルが巻いてあり、電線に交流電流が流れるとコイルに起電力が生じ、その値を計器で読むことで電流を知ることができるもので、種々の市販のタイプが使用可能である。
【０００５】
例えば照明負荷１１の場合は、Ｒ相主幹線２から分岐ブレーカ１４を経て照明負荷１１に至り、分岐ブレーカ１４を経てＴ相主幹線４に戻る（逆向きも有る）経路の約２１０Ｖ交流電流路に流れる照明負荷１１についての電流信号をクランプＣＴ５１により得ることができる。図示されていない電力アナライザはクランプＣＴ５１から電流値を得て、電圧値はＲ相主幹線２、Ｔ相主幹線４から得て、これら電流値、電圧値に基づいて照明負荷１１について電力を測定できる。電力アナライザは、電流値信号と電圧値信号から電力を求める機器で、さまざまな市販機が使用できる。照明負荷１１等に対応して合計６台の電力アナライザの電力測定値を集計することで、照明負荷全体の電力がわかり、例えば一週間、一月など適当な期間の測定結果の集計を、照明システムの変更前後で比較することで、そのシステム変更の省電力効果を評価できる。
【０００６】
【発明が解決しようとする課題】
従来例のように、複数の同種類の特定負荷一つ一つにクランプＣＴから電流値信号を得ることで電力アナライザにより、特定負荷全体の全電力測定を確実に行なうことができる。しかし同種類の特定負荷が多数あるときは電力アナライザをその複数個分用意する必要が有り、またその複数の出力データの時間軸を一致させて加算集計演算をする必要が有り、測定上の作業性や経済性の課題が有った。
【０００７】
本発明の目的は、かかる従来の特定負荷の全電力測定方法における課題を解決し、同種類の特定負荷が複数有るときでも、一台の電力アナライザにより特定負荷全体の全電力測定が容易にできる、特定負荷全電力測定方法および特定負荷全電力測定装置を提供することである。
【０００８】
【課題を解決するための手段】
上記目的を達成するため、本発明に係る特定負荷の全電力測定方法は、複数の同種類の特定負荷が配電盤のＲ相主幹線とＴ相主幹線間に設置されるときに、電流の流れている電線を切断せずに前記特定負荷に供給される電流と電圧を測定することで、前記特定負荷全体の全電力を測定する特定負荷の全電力測定方法において、前記配電盤のＲ相主幹線、Ｔ相主幹線の電流値をクランプＣＴにより測定して、Ｒ相主幹線電流値信号とＴ相主幹線電流値信号を得る主幹線電流測定工程と、前記特定負荷以外の他負荷に供給されるＲ相、Ｔ相の電流値をクランプＣＴにより測定して、Ｒ相他負荷電流値信号とＴ相他負荷電流値信号を得る他負荷電流値測定工程と、Ｒ相主幹線電流値信号とＲ相他負荷電流値信号をベクトル的に差し引いて、一個のＲ相特定負荷全電流値信号を、またＴ相主幹線電流値信号とＴ相他負荷電流値信号をベクトル的に差し引いて一個のＴ相特定負荷全電流値信号を得る特定負荷電流測定工程とを有し、得られた前記一個のＲ相特定負荷全電流値信号と前記一個のＴ相特定負荷全電流値信号から前記特定負荷の全電力を求めることを特徴とする。
【０００９】
また本発明に係る特定負荷の全電力測定方法においては、前記他負荷電流測定工程が、前記他負荷が、Ｒ相とＮ相の間またはＴ相とＮ相の間の負荷の場合には、Ｒ相主幹線から前記他負荷を経由してＮ相主幹線の末端部に接続されるそのＲ相側のＮ相主幹線末端部の電流値、Ｔ相主幹線から前記他負荷を経由してＮ相主幹線の末端部に接続されるそのＴ相側のＮ相主幹線末端部の電流値を測定して、Ｒ相他負荷電流値信号とＴ相他負荷電流値信号を得る他負荷電流測定工程であることを特徴とする。
【００１０】
また、本発明に係る特定負荷の全電力測定装置は、複数の同種類の特定負荷が配電盤のＲ相主幹線とＴ相主幹線間に設置されるときに、電流の流れている電線を切断せずに前記特定負荷に供給される電流と電圧を測定することで、前記特定負荷全体の全電力を測定する特定負荷の全電力測定装置において、前記配電盤のＲ相主幹線、Ｔ相主幹線の電流値をクランプＣＴにより測定して、Ｒ相主幹線電流値信号とＴ相主幹線電流値信号を得る主幹線電流測定手段と、前記特定負荷以外の他負荷に供給されるＲ相、Ｔ相の電流値をクランプＣＴにより測定して、Ｒ相他負荷電流値信号とＴ相他負荷電流値信号を得る他負荷電流値測定手段と、Ｒ相主幹線電流値信号とＲ相他負荷電流値信号をベクトル的に差し引いて、一個のＲ相特定負荷全電流値信号を、またＴ相主幹線電流値信号とＴ相他負荷電流値信号をベクトル的に差し引いて一個のＴ相特定負荷全電流値信号を得る特定負荷電流測定手段とを有し、得られた前記一個のＲ相特定負荷全電流値信号と前記一個のＴ相特定負荷全電流値信号から前記特定負荷の全電力を求めることを特徴とする。
【００１１】
また、本発明に係る特定負荷の全電力測定装置において、前記他負荷電流測定手段が、前記他負荷が、Ｒ相とＮ相の間またはＴ相とＮ相の間の負荷の場合には、Ｒ相主幹線から前記他負荷を経由してＮ相主幹線の末端部に接続されるそのＲ相側のＮ相主幹線末端部の電流値、Ｔ相主幹線から前記他負荷を経由してＮ相主幹線の末端部に接続されるそのＴ相側のＮ相主幹線末端部の電流値を測定して、Ｒ相他負荷電流値信号とＴ相他負荷電流値信号を得る他負荷電流測定手段であることを特徴とする。
また、本発明に係る特定負荷の全電力測定方法において、主幹線電流測定工程は、第１の親子クランプＣＴにおける親側の開閉できるリング状鉄心の中にＲ相主幹線を通してＲ相主幹線電流値を測定し、第２の親子クランプＣＴにおける親側の開閉できるリング状鉄心の中にＴ相主幹線を通してＴ相主幹線電流値を測定し、他負荷電流値測定工程は、第３の親子クランプＣＴにおける親側の開閉できるリング状鉄心の中にＲ相側のＮ相主幹線末端部を通して他負荷に供給されるＲ相の電流値を測定し、第４の親子クランプＣＴにおける親側の開閉できるリング状鉄心の中にＴ相側のＮ相主幹線末端部を通して他負荷に供給されるＴ相の電流値を測定し、特定負荷電流測定工程は、第１の親子クランプＣＴにおける子側の閉じたリングに流れる電流と、第２の親子クランプＣＴにおける子側の閉じたリングに流れる電流とをベクトル的に差し引くようにして標準的クランプＣＴにより一個のＲ相特定負荷全電流値信号を得、第３の親子クランプＣＴにおける子側の閉じたリングに流れる電流と、第４の親子クランプＣＴにおける子側の閉じたリングに流れる電流とをベクトル的に差し引くようにして別の標準的クランプＣＴにより一個のＴ相特定負荷全電流値信号を得ることを特徴とする。
また、本発明に係る特定負荷の全電力測定装置において、主幹線電流測定手段は、第１の親子クランプＣＴにおける親側の開閉できるリング状鉄心の中にＲ相主幹線を通してＲ相主幹線電流値を測定し、第２の親子クランプＣＴにおける親側の開閉できるリング状鉄心の中にＴ相主幹線を通してＴ相主幹線電流値を測定し、他負荷電流値測定手段は、第３の親子クランプＣＴにおける親側の開閉できるリング状鉄心の中にＲ相側のＮ相主幹線末端部を通して他負荷に供給されるＲ相の電流値を測定し、第４の親子クランプＣＴにおける親側の開閉できるリング状鉄心の中にＴ相側のＮ相主幹線末端部を通して他負荷に供給されるＴ相の電流値を測定し、特定負荷電流測定手段は、第１の親子クランプＣＴにおける子側の閉じたリングに流れる電流と、第２の親子クランプＣＴにおける子側の閉じたリングに流れる電流とをベクトル的に差し引くようにして標準的クランプＣＴにより一個のＲ相特定負荷全電流値信号を得、第３の親子クランプＣＴにおける子側の閉じたリングに流れる電流と、第４の親子クランプＣＴにおける子側の閉じたリングに流れる電流とをベクトル的に差し引くようにして別の標準的クランプＣＴにより一個のＴ相特定負荷全電流値信号を得ることを特徴とする。
【００１２】
本発明に係る特定負荷の全電力測定においては、配電盤のＲ相主幹線、Ｔ相主幹線の電流値を測定し、前記特定負荷以外の他負荷に供給されるＲ相、Ｔ相の電流値を測定し、Ｒ相主幹線電流値信号とＲ相他負荷電流値信号をベクトル的に差し引いて、一個のＲ相特定負荷全電流値信号を、またＴ相主幹線電流値信号とＴ相他負荷電流値信号をベクトル的に差し引いて一個のＴ相特定負荷全電流値信号を得るものとしたので、同種類の特定負荷が複数有るときでも、一台の電力アナライザにより特定負荷全体の全電力測定が容易にできる。
【００１３】
また、本発明に係る特定負荷の全電力測定においては、特定負荷以外の他負荷が、Ｒ相とＮ相の間またはＴ相とＮ相の間の負荷の場合には、Ｒ相主幹線から前記他負荷を経由してＮ相主幹線に接続されるそのＮ相主幹線側の電流値、Ｔ相主幹線から前記他負荷を経由してＮ相主幹線に接続されるそのＮ相主幹線側の電流値を測定するので、同種類の特定負荷が複数有るときでも、一台の電力アナライザにより特定負荷全体の全電力測定がさらに容易にできる。
【００１４】
【発明の実施の形態】
以下図面を用いて、本発明の実施の形態について詳細に説明する。図１は、従来例と比較するため、配電盤が、コンセント負荷（いわゆる単相１００Ｖ交流負荷）と、照明負荷（いわゆる単相２００Ｖ交流負荷）の２種類用である場合について、本発明の実施の形態における特定負荷の電力測定状況を示したものであり、図４と同様の構成要素については同一の符号を付し、説明を省略する。
【００１５】
本発明の実施の形態においては、クランプＣＴは、従来例で説明した通常のタイプのクランプＣＴに加えて、さらに親子タイプとなっているクランプＣＴ、すなわち開閉できるリング状鉄心（親）と、この親のリング状鉄心の中に通した電線を流れる電流を検出して、その検出値の例えば十分の一の電流を流す別の閉じたリング（子）を有しているものを用いる。本発明に用いる各親子クランプＣＴの子に流れる電流の低減比（例えば十分の一）は同一値に校正される。この親子タイプのクランプＣＴは、例えばアダプタ付きクランプＣＴの一種としてさまざまのタイプで市販されるものが利用できる。
【００１６】
図１において、第一の親子クランプＣＴの親６１のリングは、その中にＲ相主幹線２を、第二の親子クランプＣＴの親６３のリングはその中に、Ｒ相−Ｎ相間に複数配置のコンセント負荷のＮ相主幹線末端部６側の配線３７から４０を通している。同様にＴ相側においても第三の親子クランプＣＴの親７１のリングは、その中にＴ相主幹線を、第四の親子クランプＣＴの親７３のリングはその中に、Ｔ相−Ｎ相間に複数配置のコンセント負荷のＮ相主幹線末端部６側の配線４７から５０を通している。図１で第一の親子クランプＣＴの親６１は、配電盤１外部のＲ相電力が引き込まれたところで測定するように示されているが、Ｒ相主幹線２の全電流が測定できる個所であれば他の個所でも良い。
【００１７】
第一の親子クランプＣＴの子６２と、第二の親子クランプＣＴの子６４は、さらに別のクランプＣＴ８１のリングの中を通っている。クランプＣＴ８１は、図４で述べた従来のクランプＣＴ５１等と同様な標準的な通常のタイプである。この場合に、第一の親子クランプＣＴの子６２に流れる電流と、第二の親子クランプＣＴの子６４に流れる電流をベクトル的に差し引く形でクランプＣＴ８１のリングの中を通っている。たとえば、第一の親子クランプＣＴの親６１のリングはその中にＲ相主幹線２を、第二の親子クランプＣＴの親６３のリングはその中にＲ相−Ｎ相間に複数配置のコンセント負荷のＮ相主幹線末端部６側の配線３７から４０を通しているので、これら親子クランプＣＴの親６１と６３のリングの中を流れる電流はベクトル的に同方向である。そこで、紙面に親子クランプＣＴの子６２、６４を置いたとき、親子クランプＣＴの子６２に流れる電流の方向が紙面の上から見て時計方向のときには、第二の親子クランプＣＴの子６４に流れる電流の方向が紙面の上から見て反時計方向になるように親子クランプＣＴの子６２、６４を置き、その配置状態のままで、標準的なクランプＣＴ８１のリングの中に第一の親子クランプＣＴの子６２と、第二の親子クランプＣＴの子６４を通す。クランプＣＴ９１における第三の親子クランプＣＴの子７２、第四の親子クランプＣＴの子７４との関係も同様である。
【００１８】
クランプＣＴ８１は、電力アナライザ７のＲ相電流入力端子８０に結ばれ、クランプＣＴ９１も同様に電力アナライザ７のＴ相電流入力端子９０に結ばれる。電力アナライザ７の複数の電圧入力端子１００は、Ｒ相主幹線２、Ｎ相主幹線３、Ｔ相主幹線４と結ばれる。電力アナライザ７は、表示部８と例えばキーボード等の設定入力部９を備えている。
【００１９】
かかる図１における特定負荷の電力測定について説明する。主幹ブレーカ５、分岐ブレーカ１４等はすべて接続側に倒されているとする。第一の親子クランプＣＴの子６２のリングには、Ｒ相主幹線２を流れる全電流の例えば十分の一の電流が流れる。ここでＲ相主幹線２を流れる全電流は、Ｒ相主幹線２から照明負荷１１、１２、１３を経てＴ相主幹線４に流れる成分と、Ｒ相主幹線２からコンセント負荷３１、３２、３３を経てＮ相主幹線末端部６に流れる成分が有る。後者は、第二の親子クランプＣＴの親６３で検出され、その子６４のリングに、第一の親子クランプＣＴの子６２のリングに流れる電流の低減比と同じ低減比、例えば十分の一の電流が流れる。
【００２０】
また、第一の親子クランプＣＴの子６２に流れる電流と、第二の親子クランプＣＴの子６４に流れる電流をベクトル的に差し引くように標準的なクランプＣＴ８１のリングの中に第一の親子クランプＣＴの子６２のリングと第二の親子クランプＣＴの子６４のリングが配置されているので、クランプＣＴ８１は、Ｒ相主幹線２を流れる電流より、照明負荷以外の負荷であるコンセント負荷にＲ相からＮ相に流れる電流を差し引いた電流の例えば十分の一の電流を検出する。クランプＣＴ９１も同様にＴ相主幹線を流れる電流より、照明負荷以外の負荷であるコンセント負荷にＴ相からＮ相に流れる電流を差し引いた電流の例えば十分の一の電流を検出する。
【００２１】
ここでＲ相主幹線２を流れる全電流を考えると、Ｒ相主幹線２から照明負荷１１、１２、１３を流れてＴ相主幹線４へ戻る成分と、Ｒ相主幹線２からコンセント負荷３１、３２、３３を流れてＮ相主幹線末端部６へ戻る成分からなるので、クランプＣＴ８１の検出する電流は、照明負荷１１、１２、１３を流れる全電流の例えば十分の一である。同様にクランプＣＴ９１の検出する電流は、照明負荷２１、２２、２３を流れる全電流の例えば十分の一である。これらの電流信号を一台の電力アナライザ７のＲ相電流入力端子８０、Ｔ相電流入力端子９０に入力し、電圧入力端子１００にＲ相、Ｔ相、Ｎ相電圧信号を入力し、設定入力部９から、相線方式（今の場合単相三線方式）、親子クランプＣＴの電流低減比（例えば十分の一）、カレンダー（年月日時分）の設定条件を入力すると、電力アナライザ７は、電流、電圧、電力、力率等のデータを計算して、表示部８に表示する。
【００２２】
このように本発明の実施の形態においては、同種類の特定負荷が複数有るときでも、一個のＲ相特定負荷全電流値信号、一個のＴ相特定負荷全電流値信号を得ることができるので、一台の電力アナライザにより特定負荷全体の全電力測定が容易にできる。このことは、特定のシステム変更により省エネルギー効果を評価するために特定負荷の電力測定が必要な場合でも、配電盤において、一台の電力アナライザのみを所定の期間接続することで、特定システムの負荷の全電力が測定できるので、システム変更の前後における特定負荷の電力の変化を見ることで、省エネルギー効果の評価が容易にできる。
【００２３】
図２は、本発明に係る特定負荷の全電力測定方法を用いて、特定負荷全電力の一日の各時刻における変化を表した、いわゆる日負荷曲線と呼ばれる一例である。この例では、照明器具を従来の標準的な蛍光灯システムから、外光の明るさに応じて灯りの明るさを自動的に調整するインバータ方式調光機能の高周波ランプ（Ｈｆランプ）に全面変更したときの、照明負荷の全電力を縦軸に、横軸に一日の時刻をとってある。ここで、標準的な蛍光灯システムの場合がｉ−ｊ−ｋ−ｌで示す特性線１０１で、調光機能の高周波ランプ（Ｈｆランプ）に変更したときの雨天の日の場合がａ−ｆ−ｇ−ｈ−ｅの特性線１０２、晴天の日のときの場合がａ−ｂ−ｃ−ｄ−ｅの特性線１０３である。この特性線の差、すなわち照明システム変更前後における特性線１０１と１０２の差、あるいは特性線１０１と１０３の差の面積から電力削減値（ｋｗｈ）が、またこれらの差分面積と従来システムの場合の面積との比から電力削減率が求められ、これらは省エネルギー効果の評価値に利用できる。
【００２４】
図３は、本発明に係る特定負荷の全電力測定方法を用いて、十日間にわたって電力削減率を追跡した結果を示す。たとえば天候との関係で電力削減率が変動することがわかり、この事例では電力削減率が晴天日で約４７％、雨天日で約４２％であることが、本発明を実施することで容易に求めることができた。
【００２５】
本発明の実施の形態では、特定負荷を照明負荷、特定負荷以外の負荷をＲ相とＮ相、Ｔ相とＮ相間のコンセント負荷とし、また負荷の数もそれぞれ３個ずつに対称に配置したが、これらの数量はもとより、負荷の種類に制限されない。
【００２６】
また例えば、工場や事務所等において、既設の配電盤の導体部（主幹線）から増設導体部を分岐して、新たな配電盤を設け、その新配電盤からたとえばＯＡ機器を接続したり（ＯＡ配電盤）、温水便座、ジェットタオルの設備を接続したり（サニタリー配電盤）することが行われる。この場合においては、説明の簡単のためにコンセント負荷はないものとすると、原配電盤のＲ相主幹線に親子クランプＣＴの親６１、Ｔ相主幹線に親子クランプＣＴの親７１を接続し、次に新配電盤のＲ相主幹線、Ｔ相主幹線にそれぞれ別の親子クランプＣＴの親を接続する。そして原配電盤のＲ相主幹線に接続した親子クランプＣＴの子６２に流れる電流と、新配電盤のＲ相主幹線に接続した親子クランプＣＴの子に流れる電流を、ベクトル的に差し引く形で通常のクランプＣＴ８１のリングの中にこれらの親子クランプＣＴの子を通す。このことで、本発明の実施の形態と同様に、クランプＣＴ８１において一個のＲ相特定負荷全電流値信号を得ることができる。Ｔ相側についても同様である。このように、配電盤を分岐して、新配電盤に他負荷を設けたときでも本発明は実施できる。
【００２７】
【発明の効果】
本発明に係る特定負荷の全電力測定においては、配電盤のＲ相主幹線、Ｔ相主幹線の電流値を測定し、前記特定負荷以外の他負荷に供給されるＲ相、Ｔ相の電流値を測定し、Ｒ相主幹線電流値信号とＲ相他負荷電流値信号をベクトル的に差し引いて、一個のＲ相特定負荷全電流値信号を、またＴ相主幹線電流値信号とＴ相他負荷電流値信号をベクトル的に差し引いて一個のＴ相特定負荷全電流値信号を得るものとしたので、同種類の特定負荷が複数有るときでも、一台の電力アナライザにより特定負荷全体の全電力の測定が容易にできた。
【００２８】
また、本発明に係る特定負荷の全電力測定においては、特定負荷以外の他負荷が、Ｒ相とＮ相の間またはＴ相とＮ相の間の負荷の場合には、Ｒ相主幹線から前記他負荷を経由してＮ相主幹線に接続されるそのＮ相主幹線側の電流値、Ｔ相主幹線から前記他負荷を経由してＮ相主幹線に接続されるそのＮ相主幹線側の電流値を測定するので、同種類の特定負荷が複数有るときでも、一台の電力アナライザにより特定負荷全体の全電力の測定がさらに容易にできた。
【図面の簡単な説明】
【図１】本発明の実施の形態における配電盤における特定負荷の電力測定状況を示す図である。
【図２】本発明に係る特定負荷全電力測定方法を用いて、特定負荷全電力の日負荷曲線を求める例を示す図である。
【図３】本発明に係る特定負荷全電力測定方法により、特定負荷のシステム変更後の電力削減率を十日間にわたり追跡した結果を示す図である。
【図４】従来例の配電盤における特定負荷の電力測定状況を示す図である。
【符号の説明】
１配電盤、２Ｒ相主幹線、３Ｎ相主幹線、４Ｔ相主幹線、５主幹ブレーカ、６Ｎ相主幹線末端部、７電力アナライザ、８表示部、９設定入力部、１１，１２，１３，２１，２２，２３照明負荷、１４，１５，１６，２４，２５，２６，３４，３５，３６，４４，４５，４６分岐ブレーカ、３１，３２，３３，４１，４２，４３コンセント負荷、３７，３８，３９，４０，４７，４８，４９，５０コンセント負荷の配線、５１，５２，５３，５４，５５，５６，８１，９１クランプＣＴ、６１，６３，７１，７３親子クランプＣＴの親、６２，６４，７２，７４親子クランプＣＴの子、８０Ｒ相電流入力端子、９０Ｔ相電流入力端子、１００電圧入力端子、１０１標準的な蛍光灯システムの場合の特性線、１０２調光機能の高周波ランプ（Ｈｆランプ）システムの雨天の日の場合の特性線、１０３調光機能の高周波ランプ（Ｈｆランプ）システムの晴天の日の場合の特性線。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method and an apparatus for measuring the total power at a specific load when power is supplied to a plurality of specific loads of the same type via a switchboard.
[0002]
[Prior art]
In factories, offices, homes, and the like, various electric devices are installed, and a specific system is changed to a new system in order to save energy. In this case, it is necessary to measure the power of a specific load in order to evaluate the energy saving effect by this specific system change. For example, at a factory, lighting equipment was completely changed from a conventional standard fluorescent lamp system to a high frequency lamp (Hf lamp) with an inverter type dimming function that automatically adjusts the brightness of the light according to the brightness of external light. This is the case when it is desired to evaluate the energy saving effect when doing so. In such a case, generally, the power of the specific load may be measured using a power analyzer in a switchboard, and a change in the power of the specific load before and after the system change may be observed.
[0003]
FIG. 4 shows a power measurement situation of a specific load of a conventional example in a simple case where a switchboard is used for two types of an outlet load (so-called single-phase 100 V AC load) and a lighting load (so-called single-phase 200 V AC load). It is a thing. R-phase, N-phase, and T-phase power lines are drawn into the switchboard 1 from the outside, and conductors (also called copper strips) of the R-phase main line 2, the N-phase main line 3, and the T-phase main line 4 are respectively provided inside the switchboard. Generally, as shown in FIG. 4, three rows are provided, and the N-phase has a main trunk terminal end 6 so as to be easily connected to a load. A main breaker 5 is provided between the R-phase, N-phase, and T-phase power lines drawn from outside. Lighting loads 11, 12, 13 and 21, 22, 23 are provided between the R-phase and the T-phase above the dashed line in FIG. 14, 15, 16 and 24, 25, 26 are respective branch breakers. Outlet loads 31, 32, 33 and 41, 42, 43 are installed here between the R-phase and N-phase and the T-phase and N-phase below the one-dot chain line in FIG. 4, and the branch breakers 34, 35, 36 and 44, 45, and 46 are provided. Clamps CT51, 52, 53 and 54, 55, 56 are installed corresponding to the current paths between the R-phase and T-phase of the lighting loads 11, 12, 13, and 21, 22, 23, respectively. Connected to the current input terminal of an analyzer (not shown). A voltage input terminal of the power analyzer is connected to the R-phase main line 2 and the T-phase main line 4 by, for example, an alligator clip.
[0004]
A conventional power measurement method in this case will be described. In many cases, the N-phase conductor is at the class B ground potential, while the R-phase conductor and the T-phase conductor are charged with an AC voltage of about 105V. Therefore, the voltage between the R phase and the T phase is about 210 V, and when the branch breaker 14 or the like is tilted to the connection side, a single-phase AC power of about 210 V is supplied to the lighting load. On the other hand, the voltage between the R-phase and the N-phase and the voltage between the T-phase and the N-phase are about 105 V. When the branch breaker 34 or the like is tilted to the connection side, about 105 V of single-phase AC power is supplied to the outlet load 31 or the like. Is done. To measure the power of the entire lighting load in such a switchboard 1, the power is measured by a power analyzer using the clamps CT51 to CT56. The clamp CT is a device for measuring the current without cutting the electric current-carrying wire. Generally speaking, the clamp CT is a pinch test device that operates as a secondary winding of a current transformer, and has a ring shape. Part of the iron core can be opened and closed, and the wires pass through the ring. The coil is wound around the iron core, and when an alternating current flows through the electric wire, an electromotive force is generated in the coil, and the current can be known by reading the value with a meter, and various commercially available types can be used. .
[0005]
For example, in the case of the lighting load 11, an approximately 210 V AC current path of a route from the R-phase main line 2 to the lighting load 11 via the branch breaker 14 and to the T-phase main line 4 via the branch breaker 14 (there is a reverse direction). Current signal about the lighting load 11 flowing through the clamp CT51 can be obtained. A power analyzer (not shown) obtains a current value from the clamp CT51, obtains a voltage value from the R-phase main line 2, and a T-phase main line 4, and measures power for the lighting load 11 based on the current value and the voltage value. it can. A power analyzer is a device that obtains power from a current value signal and a voltage value signal, and various commercially available devices can be used. By totaling the power measurement values of a total of six power analyzers corresponding to the lighting load 11 and the like, the power of the entire lighting load can be known. For example, the totaling of the measurement results for an appropriate period such as one week or one month can be performed by using the lighting. By comparing before and after the system change, the power saving effect of the system change can be evaluated.
[0006]
[Problems to be solved by the invention]
As in the conventional example, by obtaining the current value signal from the clamp CT for each of a plurality of specific loads of the same type, the total power measurement of the entire specific load can be reliably performed by the power analyzer. However, when there are many specific loads of the same type, it is necessary to prepare a plurality of power analyzers, and it is necessary to perform the addition and aggregation operation by matching the time axes of the plurality of output data. There were issues of gender and economy.
[0007]
An object of the present invention is to solve the problem in the conventional total power measurement method of a specific load, and even when there are a plurality of specific loads of the same type, the total power measurement of the entire specific load can be easily performed by one power analyzer. And a specific load total power measuring method and a specific load total power measuring device.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the method for measuring the total power of a specific load according to the present invention provides a method for measuring a flow of current when a plurality of specific loads of the same type are installed between an R-phase main line and a T-phase main line of a switchboard. By measuring the current and voltage supplied to the specific load without cutting the electric wire, the total power of the specific load is measured by measuring the total power of the entire specific load. A main-line current measuring step of measuring the current value of the T-phase main line by the clamp CT to obtain an R-phase main line current value signal and a T-phase main line current value signal; R-phase and T-phase current values are measured by a clamp CT to obtain an R-phase and other load current value signal and a T-phase and other load current value signal. By subtracting the R-phase and other load current value signals in vector, one R A specific load current measuring step of obtaining a single T-phase specific load total current signal by vector-wise subtracting the specific load full current signal and the T-phase main line current signal and the T-phase other load current signal in vector. Then, the total power of the specific load is obtained from the obtained one R-phase specific load total current value signal and the one T-phase specific load total current value signal.
[0009]
In the total power measuring method for a specific load according to the present invention, when the other load current measuring step is a load between the R phase and the N phase or between the T phase and the N phase, The current value at the terminal end of the N-phase main line on the R-phase side connected to the terminal end of the N-phase main line via the other load from the R-phase main line, and via the other load from the T-phase main line Other load current that measures the current value of the N-phase main line terminal portion on the T-phase side connected to the terminal portion of the N-phase main line to obtain an R-phase other load current signal and a T-phase other load current signal It is a measurement step.
[0010]
Further, the total power measuring device for a specific load according to the present invention cuts an electric current flowing when a plurality of the same type of specific loads are installed between the R-phase main line and the T-phase main line of the switchboard. Measuring the current and voltage supplied to the specific load without measuring the total power of the entire specific load, wherein the R-phase main line and the T-phase main line of the switchboard Main current measuring means for measuring an electric current value of the main line by clamp CT to obtain an R-phase main line current value signal and a T-phase main line current value signal; Other load current value measuring means for measuring the phase current value by the clamp CT to obtain the R-phase other load current signal and the T-phase other load current signal, the R-phase main line current signal and the R-phase other load current The value signal is subtracted in a vector, and the total current value of one R-phase specific load And a specific load current measuring means for obtaining a single T-phase specific load total current value signal by vector-wise subtracting the T-phase main line current value signal and the T-phase and other load current value signals. A total power of the specific load is obtained from the one R-phase specific load total current value signal and the one T-phase specific load total current value signal.
[0011]
In the total power measuring device for a specific load according to the present invention, when the other load current measuring means is a load between the R phase and the N phase or between the T phase and the N phase, The current value at the terminal end of the N-phase main line on the R-phase side connected to the terminal end of the N-phase main line via the other load from the R-phase main line, and via the other load from the T-phase main line Other load current that measures the current value of the N-phase main line terminal portion on the T-phase side connected to the terminal portion of the N-phase main line to obtain an R-phase other load current signal and a T-phase other load current signal It is a measuring means.
In the method for measuring the total power of a specific load according to the present invention, the main line current measuring step includes the step of connecting the R-phase main line current through the R-phase main line in a ring-shaped core that can be opened and closed on the parent side in the first parent-child clamp CT. And a T-phase main line current value is measured through a T-phase main line in a ring-shaped core that can be opened and closed on the parent side in the second parent-child clamp CT. The current value of the R-phase supplied to the other load through the end of the N-phase main line on the R-phase side in the ring-shaped core that can be opened and closed on the parent side in the clamp CT is measured. The T-phase current value supplied to the other load through the N-phase main line terminal end on the T-phase side in the ring-shaped core that can be opened and closed is measured, and the specific load current measuring step is a child side in the first parent-child clamp CT. Flows into the closed ring of One R-phase specific load full current value signal is obtained by the standard clamp CT in such a manner that the current and the current flowing in the child-side closed ring in the second parent-child clamp CT are vector-wise subtracted. One T phase is obtained by another standard clamp CT in such a manner that the current flowing in the child-side closed ring in the clamp CT and the current flowing in the child-side closed ring in the fourth parent-child clamp CT are vectorically subtracted. It is characterized in that a specific load total current value signal is obtained.
Further, in the total power measuring device for a specific load according to the present invention, the main line current measuring means includes an R-phase main line current through an R-phase main line in a ring-shaped core that can be opened and closed on the parent side in the first parent-child clamp CT. And a T-phase main line current value is measured through a T-phase main line in a ring-shaped core that can be opened and closed on the parent side in the second parent-child clamp CT. The current value of the R-phase supplied to the other load through the end of the N-phase main line on the R-phase side in the ring-shaped core that can be opened and closed on the parent side in the clamp CT is measured. The T-phase current value supplied to the other load through the N-phase main line terminal on the T-phase side is measured in the ring-shaped core that can be opened and closed, and the specific load current measuring means is connected to the child side in the first parent-child clamp CT. Flows into the closed ring of One R-phase specific load full current value signal is obtained by the standard clamp CT in such a manner that the current and the current flowing in the child-side closed ring in the second parent-child clamp CT are vector-wise subtracted. One T phase is obtained by another standard clamp CT in such a manner that the current flowing in the child-side closed ring in the clamp CT and the current flowing in the child-side closed ring in the fourth parent-child clamp CT are vectorically subtracted. It is characterized in that a specific load total current value signal is obtained.
[0012]
In the total power measurement of the specific load according to the present invention, the current values of the R-phase main line and the T-phase main line of the switchboard are measured, and the R-phase and T-phase current values supplied to loads other than the specific load are measured. Is measured, and the R-phase main line current value signal and the R-phase and other load current value signals are vector-wise subtracted to obtain one R-phase specific load total current value signal, and the T-phase main line current value signal and the T-phase and other signals. Since the load current value signal is vector-wise subtracted to obtain one T-phase specific load total current value signal, even when there are a plurality of specific loads of the same type, the total power of the entire specific load is determined by one power analyzer. Measurement is easy.
[0013]
In the total power measurement of the specific load according to the present invention, when the load other than the specific load is a load between the R phase and the N phase or a load between the T phase and the N phase, the power from the R phase main line is used. The current value on the N-phase main line connected to the N-phase main line via the other load, and the N-phase main line connected from the T-phase main line to the N-phase main line via the other load Since the current value on the side is measured, even when there are a plurality of specific loads of the same type, the total power measurement of the entire specific load can be more easily performed by one power analyzer.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an embodiment of the present invention in a case where a switchboard is used for two types of an outlet load (so-called single-phase 100 V AC load) and a lighting load (so-called single-phase 200 V AC load) for comparison with a conventional example. FIG. 4 shows a power measurement situation of a specific load in the embodiment, and the same components as those in FIG. 4 are denoted by the same reference numerals and description thereof is omitted.
[0015]
In the embodiment of the present invention, in addition to the usual type of clamp CT described in the conventional example, the clamp CT is a parent-child type clamp CT, that is, a ring-shaped core (parent) that can be opened and closed. A current having another closed ring (child) through which an electric current flowing through an electric wire passed through the parent ring-shaped iron core is detected and, for example, one-tenth of the detected value is passed is used. The reduction ratio (for example, one tenth) of the current flowing through the child of each parent-child clamp CT used in the present invention is calibrated to the same value. As the parent-child type clamp CT, for example, various types of commercially available clamp CT with an adapter can be used.
[0016]
In FIG. 1, the ring of the parent 61 of the first parent-child clamp CT has the R-phase main line 2 therein, and the ring of the parent 63 of the second parent-child clamp CT has therein a plurality of rings between the R phase and the N phase. The outlet load of the arrangement passes through wirings 37 to 40 on the side of the N-phase main trunk terminal end 6 side. Similarly, on the T-phase side, the ring of the parent 71 of the third parent-child clamp CT has a T-phase main trunk therein, and the ring of the parent 73 of the fourth parent-child clamp CT has therein the T-phase-N phase. In this case, a plurality of outlet loads are passed through wirings 47 to 50 on the end 6 side of the N-phase main trunk terminal 6. In FIG. 1, the parent 61 of the first parent-child clamp CT is shown to measure when the R-phase power outside the switchboard 1 is drawn in. However, it is possible to measure the total current of the R-phase main line 2. Other places may be used.
[0017]
The child 62 of the first parent-child clamp CT and the child 64 of the second parent-child clamp CT pass through the ring of yet another clamp CT81. The clamp CT81 is a standard ordinary type similar to the conventional clamp CT51 described with reference to FIG. In this case, the current flowing through the child 62 of the first parent-child clamp CT and the current flowing through the child 64 of the second parent-child clamp CT pass through the ring of the clamp CT81 in a vector-subtracted manner. For example, the ring of the parent 61 of the first parent-child clamp CT has the R-phase main trunk 2 therein, and the ring of the parent 63 of the second parent-child clamp CT has the plurality of outlet loads arranged between the R and N phases. Of the parent-child clamps CT, the currents flowing in the rings of the parent 61 and 63 are in the same vector direction. Therefore, when the children 62, 64 of the parent-child clamp CT are placed on the paper surface, and when the direction of the current flowing through the child 62 of the parent-child clamp CT is clockwise as viewed from above, the child 64 of the second parent-child clamp CT The children 62 and 64 of the parent-child clamp CT are placed so that the direction of the flowing current is counterclockwise as viewed from above, and the first parent and child are placed in the ring of the standard clamp CT81 in the arrangement state. The child 62 of the clamp CT and the child 64 of the second parent-child clamp CT are passed. The same applies to the relationship between the child 72 of the third parent-child clamp CT and the child 74 of the fourth parent-child clamp CT in the clamp CT91.
[0018]
The clamp CT81 is connected to the R-phase current input terminal 80 of the power analyzer 7, and the clamp CT91 is similarly connected to the T-phase current input terminal 90 of the power analyzer 7. The plurality of voltage input terminals 100 of the power analyzer 7 are connected to the R-phase main line 2, the N-phase main line 3, and the T-phase main line 4. The power analyzer 7 includes a display unit 8 and a setting input unit 9 such as a keyboard.
[0019]
The power measurement of the specific load in FIG. 1 will be described. It is assumed that the main breaker 5, the branch breaker 14, and the like are all tilted to the connection side. In the ring of the child 62 of the first parent-child clamp CT, for example, one tenth of the total current flowing through the R-phase main line 2 flows. Here, the total current flowing through the R-phase main line 2 includes components flowing from the R-phase main line 2 to the T-phase main line 4 via the lighting loads 11, 12, and 13, and the R-phase main line 2 and the outlet loads 31, 32, There is a component flowing to the N-phase main line terminal end portion 6 via 33. The latter is detected by the parent 63 of the second parent-child clamp CT, and the same reduction ratio as the reduction ratio of the current flowing through the ring of the child 62 of the first parent-child clamp CT is applied to the ring of the child 64, for example, one tenth of the current. Flows.
[0020]
Also, the first parent-child clamp is inserted into the ring of the standard clamp CT81 so that the current flowing through the child 62 of the first parent-child clamp CT and the current flowing through the child 64 of the second parent-child clamp CT are vectorically subtracted. Since the ring of the CT child 62 and the ring of the second parent-child clamp CT child 64 are arranged, the clamp CT 81 applies the R to the outlet load, which is a load other than the illumination load, based on the current flowing through the R-phase main line 2. For example, one tenth of the current obtained by subtracting the current flowing from the phase to the N phase is detected. Similarly, the clamp CT91 detects, for example, one tenth of the current obtained by subtracting the current flowing from the T phase to the N phase into the outlet load, which is a load other than the illumination load, from the current flowing through the T-phase main line.
[0021]
Here, considering the total current flowing through the R-phase main line 2, the components flowing from the R-phase main line 2 to the lighting loads 11, 12, and 13 and returning to the T-phase main line 4, and the outlet load 31 from the R-phase main line 2 , 32, 33 and returning to the N-phase main trunk terminal end 6, the current detected by the clamp CT81 is, for example, one tenth of the total current flowing through the lighting loads 11, 12, 13. Similarly, the current detected by the clamp CT91 is, for example, one tenth of the total current flowing through the lighting loads 21, 22, and 23. These current signals are input to an R-phase current input terminal 80 and a T-phase current input terminal 90 of one power analyzer 7, and R-phase, T-phase, and N-phase voltage signals are input to a voltage input terminal 100, and a setting input is performed. When the setting conditions of the phase line method (in this case, a single-phase three-wire method), the current reduction ratio (for example, one tenth) of the parent-child clamp CT, and the calendar (year, month, day, hour, minute) are input from the unit 9, the power analyzer 7 Data such as current, voltage, power, and power factor are calculated and displayed on the display unit 8.
[0022]
As described above, in the embodiment of the present invention, even when there are a plurality of specific loads of the same type, one R-phase specific load total current value signal and one T-phase specific load total current value signal can be obtained. In addition, a single power analyzer can easily measure the total power of the entire specific load. This means that even if the power measurement of a specific load is necessary to evaluate the energy saving effect due to a specific system change, only one power analyzer is connected to the switchboard for a predetermined period, so that the load of the specific system can be reduced. Since the total power can be measured, the energy saving effect can be easily evaluated by observing the change in the power of the specific load before and after the system change.
[0023]
FIG. 2 is an example of what is called a daily load curve, which represents a change in the specific load total power at each time of day using the specific load total power measurement method according to the present invention. In this example, the lighting equipment has been completely changed from a conventional standard fluorescent lamp system to a high frequency lamp (Hf lamp) with an inverter type dimming function that automatically adjusts the brightness of the light according to the brightness of external light. At this time, the total power of the lighting load is plotted on the vertical axis, and the time of day is plotted on the horizontal axis. Here, the case of a standard fluorescent lamp system is represented by a characteristic line 101 indicated by i-j-k-l, and the case of a rainy day when changing to a high-frequency lamp (Hf lamp) having a dimming function is af. A -gh-e characteristic line 102 and an abcdc-e characteristic line 103 on a sunny day are shown. The difference in the characteristic lines, that is, the difference between the characteristic lines 101 and 102 before and after the change of the lighting system, or the area of the difference between the characteristic lines 101 and 103 indicates the power reduction value (kwh). The power reduction rate is obtained from the ratio with the area, and these can be used for the evaluation value of the energy saving effect.
[0024]
FIG. 3 shows the results of tracking the power reduction rate over a period of 10 days using the total power measurement method for a specific load according to the present invention. For example, it can be seen that the power reduction rate fluctuates in relation to the weather. In this case, the power reduction rate is about 47% on a sunny day and about 42% on a rainy day. I was able to ask.
[0025]
In the embodiment of the present invention, the specific load is a lighting load, the loads other than the specific load are the R-phase and N-phase, and the outlet loads between the T-phase and N-phase, and the number of loads is symmetrically arranged at three each. However, these quantities are not limited to the type of load.
[0026]
For example, in a factory or an office, an additional conductor is branched from a conductor (main line) of an existing switchboard, a new switchboard is provided, and, for example, OA equipment is connected from the new switchboard (OA switchboard). , Hot water toilet seats and jet towels are connected (sanitary switchboard). In this case, assuming that there is no outlet load for simplicity of description, the parent 61 of the parent-child clamp CT is connected to the R-phase main trunk of the original switchboard, and the parent 71 of the parent-child clamp CT is connected to the T-phase main trunk. To the R-phase main line and the T-phase main line of the new switchboard, respectively. Then, the current flowing through the child 62 of the parent-child clamp CT connected to the R-phase main line of the original switchboard and the current flowing through the child of the parent-child clamp CT connected to the R-phase main line of the new switchboard are vector-subtracted to reduce the normal current. The children of these parent-child clamps CT are passed through the ring of the clamp CT81. Thus, as in the embodiment of the present invention, one R-phase specific load full current value signal can be obtained in the clamp CT81. The same applies to the T-phase side. As described above, the present invention can be implemented even when the switchboard is branched and another load is provided on the new switchboard.
[0027]
【The invention's effect】
In the total power measurement of the specific load according to the present invention, the current values of the R-phase main line and the T-phase main line of the switchboard are measured, and the R-phase and T-phase current values supplied to loads other than the specific load are measured. Is measured, and the R-phase main line current value signal and the R-phase and other load current value signals are vector-wise subtracted to obtain one R-phase specific load total current value signal, and the T-phase main line current value signal and the T-phase and other signals. Since the load current value signal is vector-wise subtracted to obtain one T-phase specific load total current value signal, even when there are a plurality of specific loads of the same type, the total power of the entire specific load is determined by one power analyzer. Was easily measured.
[0028]
In the total power measurement of the specific load according to the present invention, when the load other than the specific load is a load between the R phase and the N phase or a load between the T phase and the N phase, the power from the R phase main line is used. The current value on the N-phase main line connected to the N-phase main line via the other load, and the N-phase main line connected from the T-phase main line to the N-phase main line via the other load Since the current value on the side is measured, even when there are a plurality of specific loads of the same type, the total power of the entire specific load can be more easily measured by one power analyzer.
[Brief description of the drawings]
FIG. 1 is a diagram showing a power measurement state of a specific load in a switchboard according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating an example of obtaining a daily load curve of a specific load total power using the specific load total power measurement method according to the present invention.
FIG. 3 is a diagram showing a result of tracking a power reduction rate after a system change of a specific load for ten days by a specific load total power measuring method according to the present invention.
FIG. 4 is a diagram showing a power measurement state of a specific load in a conventional switchboard.
[Explanation of symbols]
1 switchboard, 2 R-phase main line, 3 N-phase main line, 4 T-phase main line, 5 main breaker, 6 N-phase main line terminal, 7 power analyzer, 8 display, 9 setting input, 11, 12, 13, 21, 22, 23 lighting load, 14, 15, 16, 24, 25, 26, 34, 35, 36, 44, 45, 46 branch breaker, 31, 32, 33, 41, 42, 43 outlet load, 37, 38, 39, 40, 47, 48, 49, 50 Wiring of outlet load, 51, 52, 53, 54, 55, 56, 81, 91 Clamp CT, 61, 63, 71, 73 Parent of parent-child clamp CT , 62, 64, 72, 74 Child of parent-child clamp CT, 80 R-phase current input terminal, 90 T-phase current input terminal, 100 voltage input terminal, 101 Characteristic line for standard fluorescent lamp system, 102 dimming function High lap of Lamp (Hf lamp) characteristic line in the case of the system of rain day, the high-frequency lamp (Hf lamp) of 103 dimming characteristic line in the case of fine weather days in the system.

Claims

When a plurality of specific loads of the same type are installed between the R-phase main line and the T-phase main line of the switchboard, the current and voltage supplied to the specific load are measured without cutting the current-carrying wires. A method for measuring the total power of the specific load by measuring the total power of the entire specific load, wherein a current value of the R-phase main line and the T-phase main line of the switchboard is measured by a clamp CT , and the R-phase main line is measured. A main-line current measuring step of obtaining a main-line current value signal and a T-phase main-line current value signal; measuring the R-phase and T-phase current values supplied to loads other than the specific load by a clamp CT ; Another load current value measuring step for obtaining the other-phase load current value signal and the T-phase other load current value signal, and subtracting the R-phase main-line current value signal and the R-phase other load current value signal vectorwise to obtain one R-phase The specified load total current value signal, the T-phase main line current value signal and the T-phase A specific load current measuring step of obtaining a single T-phase specific load total current value signal by subtracting the value signal in a vector manner, wherein the obtained one R-phase specific load total current value signal and the one T-phase A specific load total power measuring method, wherein a total power of the specific load is obtained from a specific load total current value signal.

The method for measuring the total power of a specific load according to claim 1, wherein the other load current measuring step is performed when the other load is a load between an R phase and an N phase or a load between a T phase and an N phase. The current value at the terminal end of the N-phase main line on the R-phase side connected to the terminal end of the N-phase main line via the other load from the R-phase main line, and via the other load from the T-phase main line Other load current that measures the current value of the N-phase main line terminal portion on the T-phase side connected to the terminal portion of the N-phase main line to obtain an R-phase other load current signal and a T-phase other load current signal A method for measuring the total power of a specific load, which is a measuring step.

When a plurality of specific loads of the same type are installed between the R-phase main line and the T-phase main line of the switchboard, the current and voltage supplied to the specific load are measured without cutting the current-carrying wires. A total load power measuring apparatus for measuring the total power of the entire specific load, wherein the current value of the R-phase main line and the T-phase main line of the switchboard is measured by a clamp CT , and the R-phase main line is measured. Main line current measuring means for obtaining a main line current value signal and a T-phase main line current value signal; and measuring the R-phase and T-phase current values supplied to loads other than the specific load by a clamp CT , Another load current value measuring means for obtaining the other phase load current value signal and the T phase other load current value signal, and one R phase by subtracting the R phase main line current value signal and the R phase other load current value signal in vector. The specified load total current value signal, the T-phase main line current value signal and the T-phase A specific load current measuring means for obtaining one T-phase specific load total current value signal by vector-wise subtracting the value signal, wherein the obtained one R-phase specific load total current value signal and the one T phase A specific load total power measuring device, wherein a total power of the specific load is obtained from a specific load total current value signal.

4. The total power measuring device for a specific load according to claim 3, wherein the other load current measuring unit is configured such that, when the other load is a load between an R phase and an N phase or a load between a T phase and an N phase, The current value at the terminal end of the N-phase main line on the R-phase side connected to the terminal end of the N-phase main line via the other load from the R-phase main line, and via the other load from the T-phase main line Other load current that measures the current value of the N-phase main line terminal portion on the T-phase side connected to the terminal portion of the N-phase main line to obtain an R-phase other load current signal and a T-phase other load current signal A total power measuring device for a specific load, which is a measuring means.

3. The method for measuring the total power of a specific load according to claim 2, wherein the main line current measuring step includes the steps of: And a T-phase main line current value is measured through a T-phase main line in a ring-shaped core that can be opened and closed on the parent side in the second parent-child clamp CT. The current value of the R-phase supplied to the other load through the end of the N-phase main line on the R-phase side in the ring-shaped core that can be opened and closed on the parent side in the clamp CT is measured. The T-phase current value supplied to the other load through the N-phase main line terminal end on the T-phase side in the ring-shaped core that can be opened and closed is measured, and the specific load current measuring step is a child side in the first parent-child clamp CT. Electricity flowing through the closed ring of And the current flowing in the closed ring on the child side in the second parent-child clamp CT is vector-wise subtracted to obtain one R-phase specific load full current value signal by the standard clamp CT. Child side in CT One T-phase specific load full current value signal is output by another standard clamp CT by subtracting the current flowing in the closed ring and the current flowing in the child-side closed ring in the fourth parent-child clamp CT by vector. A method for measuring the total power of a specific load.

5. The total power measuring device for a specific load according to claim 4, wherein the main line current measuring means includes an R-phase main line current through an R-phase main line in a ring-shaped core that can be opened and closed on a parent side in the first parent-child clamp CT. And a T-phase main line current value is measured through a T-phase main line in a ring-shaped core that can be opened and closed on the parent side in the second parent-child clamp CT. The current value of the R-phase supplied to the other load through the end of the N-phase main line on the R-phase side in the ring-shaped core that can be opened and closed on the parent side in the clamp CT is measured. The T-phase current value supplied to the other load through the N-phase main line terminal on the T-phase side is measured in the ring-shaped core that can be opened and closed, and the specific load current measuring means is connected to the child side in the first parent-child clamp CT. Electricity flowing through the closed ring of And the current flowing in the closed ring on the child side in the second parent-child clamp CT is vector-wise subtracted to obtain one R-phase specific load full current value signal by the standard clamp CT. One T-phase is identified by another standard clamp CT by subtracting the current flowing in the child-side closed ring in the CT and the current flowing in the child-side closed ring in the fourth parent-child clamp CT in vector. A total power measuring device for a specific load, wherein a total load value signal is obtained.