Isolation Transformer T1 02. Isolation transformer T1 02 is located in the upper rear section of Cabinet A,
accessible from the generator compartment. One half of the primary winding is tied between generator GI lines
TO and T2. The other half of the primary is not used. The secondary provides voltage inputs to current boost
system Al 01 and voltage regulator VRI01. The input lines to the transformer are protected by fuses F104 and
Stepdown Transformer T103. Step-down transformer T1 03 is located in the lower rear section of Cabinet C,
accessible W from the generator compartment. The transformer is used in conjunction with UTILITY POWER
receptacle Jl01 and connection board TB1 03 to bring in 380 V ac utility power and convert it to 120 and 240 V
ac for generator set circuits.
Transformers Ti04 and Ti06 through Tb1 0.
Transformers TM04 and Ti06 through T10 are high accuracy (0.6 percent) 20:1 stepdown transformers.
The transformers are located in the upper rear section of cabinet A accessible from the generator
Transformers T1 06, T1 07, and Ti04 are tied to generator GI lines T3, T2, and T1, respectively. All three
return through line TO. These three transformers provide potential inputs to watt transducer WMT,
powerfactor transducer PFT, AC KILOVARS meter M108 (through KVAR meter transformer T105), reverse
power relay K109, load sharing panel Al 04, frequency transducer Al 03, underfrequency relays K1 07 and
K1 08, over voltage relay Kil0, undervoltage relay K111, synchronizer A105, GEN TEMP meter M105, AC
KILOVOLTS meter M101, and the generator set side of SYNCHROSCOPE MI 06. Transformer T1 06, T1
07, and TM04 primaries are protected by fuses Fl 07, Fl 08, and Fl 06, respectively. The transformer
secondaries are protected by Fl 13, Fl 1, and Fl 09, respectively.
Transformers T1 08, T1 09, and T1 10 are connected to load lines LI, L2, and L3, respectively. All three
return through line LO. These three transformers provide potential inputs to the bus side of
SYNCHROSCOPE Mi06, and to AC KILOVOLTS meter Ml 01. Transformers T1 08, T1 09, and T1 10
primaries are protected by fuses Fl1 4, F116, and F1 8, respectively. The transformer secondaries are
protected by F117, F1 9, and Fi21.
KVAR Meter Transformer T1 05. Transformer T1 05 is located in upper Cabinet B, accessible from the control
room. The transformer receives a potential input from transformers TM04 and T1 06, shifts the phase of the
input voltage 90 degrees, then applies the phase-shifted voltage to the input terminals of AC KILOVARS meter
10-4. TRANSFORMER REPLACEMENT.
Current Transformers CT1 0, CT11, CT1 2, and CT 1 4. The current transformers are mounted in the lower rear
section of cabinet B. Generator GI output leads T1, T2, and T3 pass through current transformers CT1 2, CT11,
and CT1 0, respectively. The leads have to be disconnected from load circuit breaker CB1 01 to remove the
transformers, then reconnected after transformer installation. Proceed as follows: (1) Remove.
Generator set must be shut down and MAINTENANCE LOCK-OUT switch SIOO
set to MAINTENANCE during following procedure. Generator GI leads must be
momentarily shorted to ground using a fiberglass rod with a grounded metal
tip. Failure to observe these safety procedures may result In death by
Shut down generator set in accordance with the Operator and Organizational Maintenance Manual. Be
sure MAINTENANCE LOCKOUT switch S100 has been set to MAINTENANCE.
Go into generator compartment. 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 CB1 01. Refer to Figure 10-3.
Tag and disconnect lugs of leads T1, T2, and T3 from load circuit breaker CB101.
Cut and remove tie wraps, as necessary, to free up generator GI leads along their length from the lugs to
the current transformers.