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名古屋エンジニア勉強会01
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名古屋エンジニア勉強会01
1.
名古屋でエンジニアを目指す勉強会 第1回
2.
電気の基礎-No.01 絶対禁止の断路器の生切りについて、あれこれ考え てみる。
3.
自己紹介: ● ハンドルネーム:ネコギギ ● ブログやってます。 ネコギギさんのブログ ●
勉強会を始めました。 名古屋でエンジニアを目指す勉強会
4.
断路器とは-01: ● 開閉器の一種です。 ● 平たく言うとスイッチです。 ●
disconnecting switch ディスコン、ジスコンと言ったりします。 ● 断路器には消弧能力がありません。
5.
遮断器とは: ● ブレーカーです。 ● 過電流が流れたときに、自動で電路を開放します (漏電遮断器は漏電時にも働きます)。 ●
消弧装置でアークを消弧します。
6.
アークとは: ● アーク放電のことです。 ● 平たく言うと火花です。
7.
断路器の生切りとは: ● 高圧受電設備等の断路器を、負荷電流が流れて いる状態で、開放することです。 ● すさまじいアークが発生するらしいです。 ●
どれくらいすさまじいかと言うと、人が死ぬ程すご いらしいです。
8.
断路器とは-02 ● 下流側を無電圧にするための開閉器であり、開放 を目視確認できるので、点検整備時の安全のため に使用されます。 ● 消弧装置がないので、負荷電流が流れていない状 態で開放します。すなわち、遮断器、開閉器を開放 した後でなければ、開放してはいけません。
9.
家庭の照明のスイッチ: ● 家庭にある低圧100Vの照明のスイッチには、消弧 装置は付いていません。 断路器は負荷電流が流れている状態での開放が 禁止されているのに、家庭の照明のスイッチは大 丈夫なのでしょうか。
10.
電圧の区分: ● 低圧だからです。 ● 電圧の区分(交流) 特別高圧:7000Vを超えるもの 高圧:600Vを超え、7000V以下のもの 低圧:600V以下のもの (電気設備技術基準第2条)
11.
ガス漏れ時: ● あわてて電灯、換気扇のスイッチを入れてはいけ ません。 ● 火花が出ることがあるからです。 ●
低圧でもやっぱり火花は発生します。
12.
放電とは: ● 電極間の電位差により、空気に絶縁破壊が生じ、 電流が流れます。
13.
アーク放電とは: ● 電極間の電位差により、電極間の気体に持続的に 発生する放電です。 ● 火花放電の状態で、電流が増大すると、低電圧で も継続的な放電が発生します。
14.
サージ: ● 電気回路などに、異常に高い電圧が、瞬間的に発 生する現象です。 ● 雷によるものを、雷サージと言います。
15.
開閉サージ: ● 電気回路の開閉により生じるサージです。 ● 誘導性または容量性の小電流の開閉時に発生し やすい。 ●
平たく言うと、回路中にコイルかコンデンサがある ような場合です。
16.
雷サージ: ● 雷により発生する、過渡的な異常高電圧です。
17.
避雷針: ● 落雷時に雷を誘導し、大地に逃がすことによって、 人や電気設備を保護します。
18.
避雷器: ● 回路中に意図的に絶縁の弱い部分を作り、サージ 電流をバイパスさせます。
19.
絶縁協調: ● 系統各部の絶縁を、技術的にも経済的にも、全体 として最もバランスのとれた形に設計します。
20.
保護協調: ● 電気回路に生じた事故を直ちに切り離し、事故の 拡大を防止します。 ● 遮断器やヒューズで事故回路を切り離し、健全な 回路の遮断器やヒューズが動作しないように、協 調を図ります。
21.
蛍光灯: ● 放電で発生する紫外線を蛍光物質に当て、可視光 線に変換します。
22.
蛍光灯の安定器: ● 放電を安定させます。
23.
アーク溶接: ● アーク熱を利用する電気溶接法です。
24.
まとめ: ● 断路器の生切り、雷など、放電現象はこわいもの です。 ● しかし、蛍光灯やアーク溶接など、放電をコント ロールし利用しているものは、身近なところにあり ます。
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