quale surge? - volta
TRANSCRIPT
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• EMC
– IEC 61000-4-6
• Isolamento
– IEC 60664-1
• Motori (recommendation!)
– IEEE 522-2004
– IEC 60031-15
Quale surge?
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• Surge di verifica dell’immunità di un provino a seguito di fulminazione
• Impedenza: 2Ω, 12Ω, 42Ω...
EMC
Open circuit voltage Tf = 1.67 x T = 1.2s ± 30% Td = Tw = 50 s ± 20%
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• Surge (impulse voltage) di verifica della tenuta dell’isolamento
• Data la tensione nominale di alimentazione, si forniscono diversi livelli di tensione a seconda della categoria di sovratensione
• Waveform: 1.2/50 da IEC 61180-1
• Impedenza: < 500Ω
Isolamento
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• IEEE 522-2004 – IEEE Guide for Testing Turn Insulation of
Form-Wound Stator Coils for Alternating-Current Electric Machines • Individual stator coils after manufacture
• Coils in completely wound stators of original manufacture
• Coils and windings for rewinds of used machinery
• Windings of machines in service to determine their suitability for further service (preventive maintenance testing)
Motori: IEEE 522-2004
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Motori: IEEE 522-2004
IEEE Surge Test Voltage Formula for Form Coils and Form Wound Machines
Rated Line-Line RMS Voltage 𝑉𝐿
V1 𝑉1 =23 ∙ 𝑉𝐿 = 0.8165 ∙ 𝑉𝐿
Surge Test Voltage V2 𝑉2 = 3.5 ∙ 𝑉1 = 2.86 ∙ 𝑉𝐿 𝑇𝑟 = 0.1. . 0.2𝜇𝑠
La tensione è ridotta in casi particolari
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IEC Surge Test formula for Sample Form Coils before installation in the Stator
Lighting Withstand peak V 𝑈𝑃 = 4 ∙ 𝑈𝑁 + 5𝑘𝑉 UN = L-L RMS Voltage
Peak Rated Impulse V 𝑈′𝑃 = 0.65 ∙ 𝑈𝑃 Rise time: 0.1..0.2 𝜇𝑠
Surge Test Impulse V 𝑈′𝑃 = 0.65 ∙ 𝑈𝑃
= 2.6 ∙ 𝑈𝑁 + 3.25𝑘𝑉
Motori: IEC 60031-15
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• Un impulso di tensione viene inviato al dispositivo sotto prova. La misura della tensione ai capi del dispositivo sotto prova viene chiamata Surge.
• L’impulso si scarica velocemente sul dispositivo sotto prova: ricarica e scarica il condensatore finché l’energia non è dissipata dalla resistenza del provino.
• La corrente è sinusoidale con frequenza e ampiezze di picco proprie del circuito chiuso creato nell’apparecchio sotto prova
Surge per motori
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Surge per motori
+1500
V
-
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• IEC 60034-18-41
– Damaged lead close to laminations
– Partial discharge in air gap
– Partial discharge between windings
– ...
Scariche parziali
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Scariche parziali
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Gli strumenti
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Grazie per l’attenzione!