電力の品質
電気は、現代の産業のほとんどすべての場所で必要不可欠ですが、その電気を品質という観点から考えてみたことはあるでしょうか。
電力の高品質とは、停電しないこと、周波数が乱れないこと、電圧が上下しないこと等々で、これらの品質の低下は電気を使用している機器に悪い影響を与え、ときには深刻なダメージを生じさせます。
日本で電気事業者から供給される電力は充分に高品質であり、これに需要家側で備える無停電電源装置や各種の補償装置により、一見これ以上は品質向上の余地がないように思われます。
実際、電気事業者側で見るとほぼそのような状態なのですが、需要家側では多少異なります。
「高品質な電力」は、各需要家の受電設備直下での話である場合が多いのです。
たとえば工場で、大きなモータを動かすと電圧の低下が工場全体の設備に及ぶことがありますが、これにより他の機器が直接的なダメージを受けでもしないかぎり、この電圧低下は放置されがちでした。
またたとえば工場等ではたいていの場合、受電設備で一括して力率の遅れを補償しますがこれは電気事業者に対してであり、工場内では力率は遅れたままなので工場の設備はその分余計な容量が必要でした。
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