Set circuit breaker locking beam. SET POWER circuit breaker CB124, and UTILITY POWER circuit
breaker CB125 as desired.
Go out of the control room and into the generator compartment. Remove cabinet C rear access panel in
accordance with the Operator and Organizational Maintenance Manual.
Use push hook on upper end of fuse Fl 01 to push fuse into fuse dip. See Figure 10-6.
Reinstall cabinet C rear access panel.
Isolation Transformer T102. Isolation transformer T102 is mounted in the rear section of Cabinet A Its primary is
connected directly to generator G1 lines T2 and TO. Hence, generator G1 must be shut down and discharged
prior to working on isolation transformer T102.
Generator set must be shut down and MAINTENANCE LOCK-OUT switch SIOO set to
MAINTENANCE during following procedures. Generator G1 output lines T1, T2, and T3 must
be momentarily grounded to remove static potentials that may be present on lines T1, T2, or
T3. Failure to follow these procedures may result In death by electrocution.
Generator set output power cable assemblies must be disconnected from output terminals
and "parked" on standoff Insulator assemblies during following procedures. Failure to do so
may result In death by electrocution.
Shut down generator set in accordance with Operator and Organizational Maintenance Manual. Be sure
MAINTENANCE LOCKOUT switch S100 has been set to MAINTENANCE.
Disconnect generator set power output cables from generator set terminals and Spark" the cables on their
standoff insulator assemblies.
Go into the generator compartment and remove cabinet B rear access panel in accordance with the
Operator and Organizational Maintenance Manual.
Using a grounding stick with a grounded metal tip, momentarily touch the lugs of generator G1 leads T1,
T2, and T3 where they connect to load circuit breaker CB101. See Figure 10-3.
Reinstall rear access panel of cabinet B. Remove cabinet A rear access panel.
Tag and disconnect wires from terminals of isolation transformer T102.
See Figure 10-5. Remove hexagon head capscrews (4), lockwashers (5), and hexagonal nuts (6) to
remove isolation transformer T102 (7).
Remove fuses (8), if good, and store in generator set tool box for future use as spares.
See Figure 10-5. Install isolation transformer T102 (7) and secure with hexagonal nuts (6), lockwashers
(5), and hexagon head capscrews (4).
New replacement isolation transformers (7) come with fuses (8) already installed. H missing,
note that only two fuses (Fi04 and Fl 03) are actually required. Fuse Fl05 is never in circuit.
Make wiring connections to transformer T102 terminals as tagged. Remove and discard tags.
Reinstall rear door of cabinet A.