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T = TruTstw= oTrtuhsytworthy
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Y = YauYld= Yauld
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Certificates
มาตรฐาน ISO 9001: 2015 ( Quality Management System )
จากบริษัททูฟ นอรด (ประเทศไทย) จำกัด
มาตรฐาน ISO 14001 : 2015 (Environmental Management System)
มาตรฐาน ISO 45001-2018 ระบบมาตรฐานการจดั การอาชวี อนามยั และความปลอดภยั
มาตรฐานเลขท่ี มอก.17025-2561
มาตรฐานผลิตภัณฑอุตสาหกรรม มอก 11-2553 จากกระทรวงอุตสาหกรรม
มาตรฐานผลติ ภณั ฑอ ุตสาหกรรม มอก 11-2559 จากกระทรวงอุตสาหกรรม
มาตรฐานผลิตภัณฑอตุ สาหกรรม มอก 293-2541
มาตรฐานผลติ ภณั ฑอ ตุ สาหกรรม มอก 2143-2546
มาตรฐานผลิตภัณฑอ ุตสาหกรรม มอก 838-2531
หนังสือรับรอง MiT จากสภาอตุ สาหกรรมแหงประเทศไทย
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ตวั อย3างการต3อโดยการพันสายรอบสกรู
§ ปอกปลายสายใหม4 ีความยาวประมาณ 1.5 ถงึ 2 ซม. ข้นึ กบั ขนาดของสกรู
§ ใช4คีมม4วนปลายสายให4มีลักษณะโค4งเปSนวงกลม และตัดปลายสายส0วนท่ี
เกนิ ออก
ปอกปลายสายยาว
ประมาณ 1.5 ถงึ 2 ซม.
ตัดสoวนท่ียาวเกนิ ออก
§ คลายสกรูออกและนำปลายสายที่โค4งไว4วางทาบลงให4ปลายสายหันไปใน
ทิศทางตามเขม็ นา‰กิ า แลว4 ขนั สกรใู หแ4 น0น
หมุดเกลียว
ตวั นำสมั ผสั อยoางมน่ั คง
พันสาย 2/3 รอบหมุด
รปู ท่ี 1.5 ตัวอย3าเกงลกยี าวรตอ3 สายโดยการพนั สายรอบสกรู ท่ีถูกตอB ง
ตวั อยา0 งการตอ0 สายพันรอบสกรูที่ไม0ถกู ต4อง เปนS ดังนี้ ไม0มว4 น
ปลายสาย
พันไมแo นบสกรู ปลายสายยาวเกิน มว? นปลายสาย
ผดิ ทศิ ทาง
รปู ท่ี 1.6 ตัวอยา3 งการต3อสายโดยการพันสายรอบสกรู ท่ีไมถ3 ูกตอB ง
คม)ู ือการตดิ ต้งั ระบบไฟฟา9
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28
รีเลย;ตรวจจับกระแสรัว่ ลงดิน
จุดทเี่ กิดกระแสรั่วลงดิน
A เมนสวติ ช;
NCB GN GFR
Load
สายดิน
กระแสรว่ั ไหลกลับทางดินหรือสายดนิ
รูปที่ 2.4 วิธีวดั กระแสไหลกลับผ5านระบบดนิ
2. วิธีวัดกระแสสมดุล (Zero Sequence Sensing Method) วิธีนี้ใชHหลักการ
ว?า ผลรวมของกระแสไฟฟ3าในวงจรตHองเป+นศูนย( การวัดจะใชHหมHอแปลงกระแสชนิด
zero sequence current transformer (ZCT) จำนวน 1 ตัววัดทั้ง 3 เฟส รวมสาย
นิวทรัลดHวย ตามท่ีแสดงในรูปที่ 2.5 การวัดดHวยวิธีนี้สายต?อหลักดินจะต?อกับบัสบาร( G
หรือ N กไ็ ดH
รีเลย;ตรวจจับกระแสรว่ั ลงดนิ
จุดทเ่ี กิดกระแสรัว่ ลงดนิ
A เมนสวติ ช; ZCT
B Load
NC GN GFR สายดิน
กระแสรัว่ ไหลกลับทางดินหรือสายดนิ
รูปท่ี 2.5 วิธีวัดกระแสสมดุล
คูม) อื การติดตัง้ ระบบไฟฟา9
29
3. วิธีวัดกระแสตกคVาง หรือกระแสเหลือ (Residual Sensing Method) วิธีน้ี
ใชHหลักการเดียวกับวิธีวัดกระสมดุล แต?การตรวจจับจะใชHหมHอแปลงกระแสจำนวน 4 ตัว
และรวมกระแสเขHาดHวยกัน ตามที่แสดงในรูปที่ 2.6 ขHอควรระวังคือการต?อวงจรหมHอ
แปลงกระแสจะตHองตอ? ขวั้ ใหHถูกตอH งดวH ย
รีเลย;ตรวจจับกระแสร่วั ลงดิน
AB เมนสวิตช; จดุ ท่ีเกดิ กระแสร่วั ลงดนิ
NC GN GFR Load
สายดิน
กระแสร่วั ไหลกลบั ทางดินหรอื สายดนิ
รปู ที่ 2.6 วิธวี ัดกระแสตกคVาง
ขHอควรระวังในการใชHวิธีวัดกระแสสมดุลและกระแสตกคHางคือ โหลดที่มีฮาร(มอ
นิกส(สูง ผลรวมของกระแสที่วัดไดHจากเครื่องตรวจจับกระแสรั่วลงดินในสภาพการใชHงาน
ปกตอิ าจไม?เป+นศนู ย( ดงั นน้ั ในการตัง้ คา? การปลดวงจรจงึ ควรเผือ่ คา? กระแสนไ้ี วHดวH ย
2.6 กับดักฟAาผาG (Lightning Arrester)
ฟ3าผ?าเป+นผลใหHมีแรงดันไฟฟ3าสูงมากวิ่งมาตามสายไฟฟ3าเขHาไปในอุปกรณ(ที่
สายไฟนั้นต?ออยู? แรงดันเกินนี้จะทำใหHฉนวนของอุปกรณ(ไฟฟ3าชำรุด หรืออาจรุนแรงถึง
ขั้นอุปกรณ(ไฟฟ3าระเบิดไดH ดังนั้นกับดักฟ3าผ?าจึงทำหนHาที่ดักแรงดันเกินนี้โดยการปล?อยใหH
ใหHผ?านลงดินไป กับดักฟ3าผ?าจึงเป+นอุปกรณ(ที่ทำหนHาที่ลดความเสียหายของอุปกรณ(ไฟฟ3า
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