TM 9-6115-04-34NAVFAC P-8-633-34e.Stepdown Transformer T103. Stepdown transformer T103 is mounted in the rear section of cabinet C, on thefloor. When UTILITY POWER circuit breaker CB1 25 is set to ON and the station power cable assembly isconnected to bring in UTILITY POWER at J101, one or both windings of transformer T103 will be “hot”. Hence,the transformer must be isolated before it can be safely worked on.WARNINGStation power cable assembly must be disconnected from UTIUTY POWER receptacle J101and UTILUTY POWER circuit breaker CB125 must be set to OFF before working on stepdowntransformer T103. Failure to do so may result In death by electrocution.WARNINGHazardous voltages appear at terminals In rear section of Cabinet C when generator set Isrunning. Do not touch any terminals Inside Cabinet C unless specifically Instructed by thefollowing procedure. Failure to comply with this warning may result In death byelectrocution.(1)Remove(a)Disconnect station power cable assembly from UTILITY POWER receptacle J101.(b)Go into the control room. Set UTILITY POWER circuit breaker CB1 25 to OFF and set circuit breakerlocking beam such that the circuit breaker cannot be set back to ON.(c)Go into the generator compartment and remove cabinet C rear access panel in accordance with theOperator and Organizational Maintenance Manual.(d)See Figure 10-7. Remove hexagon head capscrews (11), flat washers (12), wire terminal shields (13), <lockwashers(14), spacers (15), flatwashers (16), and hexagonal nuts (17)to gain accesstotransformerTi03terminal hardware.(e)Tag and disconnect wires from transformer T1 03 terminals.(f)Remove hexagon head capscrews (18) and lockwashers (19) to remove stepdown transformer T103 (20).(2)Install(a)Install stepdown transformer T103 (20) and secure with lock-washers (19) and hexagon head capscrews (18).(b)Make wiring connections to T103 terminals as tagged. Remove and discard tags.(c)Install hexagonal nuts (15), flat washers (16), spacers (15), lockwashers (14), wire terminal shields (13), flatwashers (12), and hexagon head capscrews (11).(d)Reinstall cabinet C rear access panel in accordance with the Operator and Organizational MaintenanceManual.(e)Go into control room and set circuit breaker locking beam, SET POWER circuit breaker CB1 24, andUTILITY POWER circuit breaker CB125 as desired.f.Transformers T104 and T106 through T110. These six transformers are vertically mounted in the upper rearsection of Cabinet A. All of them have their primaries tied to generator load lines T1 through T3 or LI through L3.Therefore, the generator set must be shut down, the output power cables must be disconnected, and the loadlines must be discharged before the transformers can be safely worked on.10-14
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