q測(cè)量?jī)x器與技術(shù)基礎(chǔ)-展示頁(yè)
2025-05-20 23:35本頁(yè)面
【正文】 02 0 0 . 0 02 5 0 . 0 03 0 0 . 0 03 5 0 . 0 04 0 0 . 0 04 5 0 . 0 00 10 20 30 40 50 60 70 80 90Electricity is generated by conductors rotating though a magic field 電是由在磁場(chǎng)中旋轉(zhuǎn)的導(dǎo)體產(chǎn)生的 Pick a point on a circle, rotating counterclockwise at a fixed speed. When the angle is small the change in height is rapid. As the angle increases towards 90176。 the change in height slows. The distance from the “the horizon” sweeps out a sine wave. 在圓周上選一個(gè)點(diǎn)，該點(diǎn)以固定速率在圓周上向逆時(shí)針?lè)较蛐D(zhuǎn)。 方向增長(zhǎng)時(shí)， 高度的變化也組件減緩。 Why Sine Waves ? 為什么會(huì)是正弦波？ Luis Introduction to 3 Phase Power Company Confidential 3 Why 3Phase? 為什么為三相？ 700 .00 600 .00 500 .00 400 .00 300 .00 200 .00 100 .000 45 90 135 180 225 270 315 360D e g r e e sV (phase to phase)ABACT hr ee Phase G r ounded 500 .00 400 .00 300 .00 200 .00 100 .000 45 90 135 180 225 270 315 360V (ref to earth)A B C? At any instant the current on the neutral is zero. Try it! 在任何情況下，零線(xiàn)上的凈電流為零。 ? If you add more than three phases it adds more cost but doesn’t deliver significant performance improvements 如果相數(shù)多余三個(gè)，會(huì)增加很多費(fèi)用，但是性能并沒(méi)有明顯改善。 ? Three individual current phases typically 120 degrees out of phase of each other. 三個(gè)獨(dú)立的電流相位彼此之間一般相差 120度。 Luis Introduction to 3 Phase Power Company Confidential 5 From the Dam to Your Load 從發(fā)電站到負(fù)載 Luis Introduction to 3 Phase Power Company Confidential 6 From the Dam to Your Load 從發(fā)電站到負(fù)載 High Voltage (over 100kV) is used for transmission. All 3phase 用于電力傳輸?shù)母邏壕€(xiàn)路（ 100kV以上）。 使用 PT來(lái)測(cè)量電壓。大多數(shù)為三相系統(tǒng)。 ? Fuses and circuit breakers 保險(xiǎn)和電路斷路器 ? Protective relays 保護(hù)繼電器 ? Lightning arrestors 避雷器 ? Switches 電閘 ?“Reclosure” ?自動(dòng)開(kāi)關(guān) Luis Introduction to 3 Phase Power Company Confidential 7 From the Dam to Your Load 從發(fā)電站到負(fù)載 Luis Introduction to 3 Phase Power Company Confidential 8 Transformer Connections 變壓器的連接 Singlephase systems 單相系統(tǒng) Threephase, Four wire systems 三相、四線(xiàn)系統(tǒng) Threephase, Three wire systems 三相、三線(xiàn)系統(tǒng) Luis Introduction to 3 Phase Power Company Confidential 9 Delta Configuration 三角型配置 ? Comprised of 3 voltages and 3 currents. 由三個(gè)電壓和三個(gè)電流組成 ? No Neutral wire. 無(wú)零線(xiàn) ? Sometimes has a ground wire. 有時(shí)有地線(xiàn) ? Voltage is measure as ―phase to phase‖. 測(cè)量的電壓為“相－相”電壓 – Typically 480vrms. 一般為 480vrms. Luis Introduction to 3 Phase Power Company Confidential 10 Wye Configuration Y型配置 Almost all mercial and light industrial loads are supplied by GroundedY (4wire Y) transformers. 幾乎所有的商業(yè)和照明領(lǐng)域的負(fù)載都是由 接地的 Y型（ 4線(xiàn) Y型）配置的變壓器供電的 ? Comprised of 3 voltages and 3 currents. 由三個(gè)電壓三個(gè)電流組成 ? Neutral wire and ground wire. 零線(xiàn)和地線(xiàn) ? The Wye delivers two stable voltage levels from one transformer 在 Y性配置下，變壓器可以提供兩個(gè)電壓 – Phase to Neutral may be used for smaller loads 相－零電壓，小的負(fù)載可以使用這個(gè)電壓 – Phase to phase may be used for larger loads or longer wiring runs 相－相電壓，大負(fù)載或配線(xiàn)較長(zhǎng)時(shí)可以使用該電壓 Luis Introduction to 3 Phase Power Company Confidential 11 Voltage Levels 電壓
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