FVNR

AcronymDefinition
FVNRFull Voltage Non-Reversing (electric motors)
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Note, in the cited paper, it was not specified whether the reported starter power losses corresponded to FVNR or full voltage reversing (FVR) starters and whether a fusible switch or breaker was used.
Panelboard.sub.power loss] = Main [Breaker.sub.loss] + Enclosure Bus [Bar.sub.loss] + [Breakers.sub.loss] + Fusible [Switches.sub.loss] + NEMA FVNR Motor [Starters.sub.loss] (17)
The panelboard has a main breaker that feeds the secondary branch devices which consist of five breakers, three fusible switches, and three FVNR motor starters.
H = 1.327 m Secondary Branches Breaker 1: Breaker 2: Rating = 200 amps Rating = 175 amps Load = 130 amps, lf= 0.9 Load = 90 amps, lf= 0.8 Breaker 3: Breaker 4: Rating = 100 amps Rating = 100 amps Load = 70 amps, If = 0.8 Load = 70 amps, If= 0.8 Breaker 5: J Fuse/switch 1: Rating = 100 amps Ratings = 100/160 amps Load = 70 amps, lf = 0.8 Load = 60 amps, If = 0.8 J Fuse/switch 2: J Fuse/switch 3: Ratings = 200/250 amps Ratings = 100/160 amps Load = 120 amps, lf = 0.8 Load = 80 amps, lf =0.8 NEMA 1 FVNR motor starter: NEMA 3 FVNR motor starter: Rating = 20 amps (J Fuse) Rating = 60 amps (J Fuse) 7hp motor, [eta] = 85%, pf = 0.9 20 hp motor, [eta] = 90%, pf = 0.9 lf = 0.7, Load = ?
The FVNR motor starter load currents are calculated from
The FVNR motor starter load currents designated as [I.sub.1], [I.sub.2], and [I.sub.3] are determined in Table 9.
Determination of FVNR Motor Starter Load Currents NEMA 1 FVNR motor starter [I.sub.1] = 16.4 amps NEMA 2 FVNR motor starter [I.sub.2] = 26.4 amps NEMA 3 FVNR motor starter [I.sub.3] = 44.3 amps The main branch load current, I in amps, is found using Equation 14.