GENERAL (cont) - TM-9-6115-604-12

TM-9-6115-604-12 Generator Set Diesel Engine Driven Tactical Skid Rtd. 60 Kw 3 Phase 4 Wire 120/208 and 240/416 Volts Manual
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ARMY TM 9-6115-604-12 NAVY NAVFAC P-8-633-12 e. Lightning Arresters EI01. E102. and E103. Lightning arresters E101, E102, and E103 are connected between generator set ground and generator G1 lines T1, T2, and T3, respectively. They provide a path to ground for high voltage transients on the output lines of generator G1 and any bus the generator set may be connected to while load circuit breaker CB101 is closed. f. Main Disconnect Switch S120. Main disconnect switch S120 is a frame-mounted, three pole switch with group-operating parts, mechanism operating assembly, and switch handle. The switch handle and the mechanism operating assembly are linked by a drive chain. Raising the handle to the up position closes the switch. To prevent switch opening or closure while tied to generator G1, main disconnect switch S120 is kirk-key interlocked with load circuit breaker CB101. The interlock prevents switch handle operation unless CB101 is racked out. Main disconnect switch S120 is directly connected to generator set output terminals L1, L2, and L3. g. Lights. Switches. and Receptacles. 120 V ac lights, switches, and receptacles are found in the control room, engine compartment, and generator compartment. Utility power is normally used to power these circuits, but generator G1 may be used if SET STATION POWER circuit breaker CB124 is set TM ON and the generator set is operating. The receptacles are protected by 20 amp circuit breakers. The lighting circuits are protected by 15 amp circuit breakers. All of these circuit breakers are part of the control room distribution panel DP2 (See figure 2-11 ). h. Wiring and Harnesses. Harnesses interconnect elements of the AC electrical power generation and control system. Refer to wiring diagrams FO4-29. All wires in the generator set have wire number markings along their lengths. The DC and AC schematics (FO-1 and FO-2) provide functional representations of component and circuit interconnection within the generator set. i. Cable Assemblies. Cable assemblies are used to interconnect the generator set to an external bus, to other generator sets, and to utility power. The cables and their functions are as follows: (1) Outgoing Power Cable Assembly Four outgoing power cable assemblies are provided, one for each phase line of generator set output (L1, L2, and L3) and one for neutral (10). Each cable is 100 feet (30 meters) long. Wire identification straps along the lengths of the cables identify the cables by line number. Terminal elbows at one end of each cable are used to connect the cables to the generator set output terminals. Each output terminal consists of a shedwell bushing which mates with the terminal elbow of an outgoing power cable. The output terminals are labelled L1, L2 L3, and L0 so that the cables can be properly connected. Tie-down loops on the cable grips near the elbow end of the cables allow the cables to be hitched to a hook on the skid base while they are connected to the output terminals. The cable grips maintain slack in the cable to prevent undue stress at the cable-to-generator set connections. At the opposite end of each cable is a terminal lug for connecting the cables to a load bus. A stress cone kit installed between the cable and the terminal lug relieves corona effects at this end that could weaken the insulation electrically. At the generator set end of each cable, an 18 inch (46 cm) 12 gage insulated wire is used to ground the shielding of the cable to the generator set housing. Shield grounding wires are also provided near each terminal lug end for connection to the appropriate load ground terminals. Adjacent to each output terminal is a standoff insulator assembly. Like the output terminals, these standoffs also mate with the output terminals. These standoffs are used to “park” the cables when the elbows are removed from the output terminals. (2) SRM Cable Assemblies J28 and J29. These cables are required for paralleling generator sets if using the site requirement module (SRM). The cables carry control signals necessary for automatic paralleling. Each cable is 100 feet (30 meters) long. 4-94

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