65820162963 Nema Mg1 Fast Bus Transfer Info r3
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=(Lm+L2)/R2 NEMA MG1 Definition of Toc
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Transcript of 65820162963 Nema Mg1 Fast Bus Transfer Info r3
=(Lm+L2)/R2
NEMA MG1 Definition of Toc
NEMA MG1 Requires 2 * Toc prior to Reclosing
Remainder of NEMA MG1 20.24
Time Constant Estimation ECW Vent Fan ~ 0.36 seconds (see next slide).
Time Constant Calculation
• Ifinal = Io *exp(-t/Tau)
• -ln (Ifinal/Io) = t/tau
• ln(I0/Ifinal) = t/tau
• tau = t/ln(I0/Ifinal)
• Tau = 0.24/ln(2) = 0.36 sec
• Minimum off-time = 1.5*0.36sec = 0.52 sec
