MIL-DTL-16036M(SH)
m. Space, mounting, and wiring for the electric governor equipment, if required (see 6.2). Equipment shall be
furnished with the generator set.
3.4.1.1.1 AC generator control unit for switchgear groups on ships provided with a centralized machinery
control system including an EPCC, but not an EPCP. The following shall be mounted within the unit:
a.
One generator circuit breaker, electrically-operated.
b. One control power transformer (450/120 volts), connected to generator side of generator circuit breaker, for
generator breaker and governor motor control circuits, if required.
c. Potential transformer for metering and relaying, electric governor, and synchronizing, in number as
required.
d. Current transformers, for metering and relaying, and for electric governor, in number as required.
Protective device when metering is remote.
e.
One current transformer with protective device for remote metering.
f. Dead-front fuse panel for fusing of the potential and control transformer primary circuits and any control
circuits extending outside of the section. Dead-front fuseholders shall be of the type listed in 3.14.2.1 in accordance
with MIL-PRF-19207.
g. Space, mounting, and wiring for the voltage regulator equipment, including associated current and potential
transformers as specified (see 6.2). Equipment shall be furnished with the generators.
h.
Relays for remote control of the generator circuit breaker. Relays shall be energized from EPCC power.
i. Load sensing relays in accordance with MIL-R-24563 or MIL-M-24350 to sense generator overload and
activate the load shedding system, if required (see 6.2).
j. One Type AQB-A or AQB-LF circuit breaker (see 3.12), instantaneous element only, for power supply to
the pump supplying cooling (sea) water to the generator diesel or gas turbine prime mover. Circuit breaker shall be
connected on the generator side of the generator circuit breaker. A red warning instruction plate shall be provided
stating that the circuit breaker shall always be in the closed position when the gas turbine or diesel are set up for
starting.
k. One circuit breaker (see 3.12), Type AQB-A or AQB-LF, 250-ampere frame size. Casualty power circuit
breaker shall be connected to the generator side of the generator circuit breaker. When the generator capacity is 500
kilowatts or greater, two casualty power circuit breakers shall be furnished.
l. One casualty power terminal, back-connected type, conforming to MIL-DTL-24552 connected through the
AQB-A or AQB-LF circuit breaker, item (k). When the generator capacity is 500 kilowatts or greater, two casualty
power terminals, back-connected type, shall be furnished.
m. One reverse power relay, conforming to MIL-M-24350, to prevent the generator from motoring on the bus
after loss of driving power from prime mover.
n. One generator running and voltage available auxiliary relay for control of associated indicator lights. This
relay is not required when a supervisory control system (SCS) is incorporated in the EPCC, and the signal can be
derived from generator voltage and speed signals.
o. Space, mounting, and wiring for the electric governor equipment, if required (see 6.2). Equipment shall be
furnished with the generator set.
p. One Type I synchronizing system for each switchgear group. The synchronizing control system may be
mounted in the bus tie unit instead of the generator control unit.
q. One Type II automatic paralleling device, if required (see 6.2). The automatic paralleling system may be
mounted in the bus tie unit instead of the generator control unit.
3.4.1.1.1.1 Front panel. The following shall be mounted on the front panel of the generator unit:
a.
One AC ammeter for reading one phase of generator current.
b. One AC voltmeter with transfer switch for reading one phase of generator potential, one phase of each bus
tie voltage, and one phase of shore power voltage for switchgear group containing shore power connection.
c.
One polyphase wattmeter for reading generator output.
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