Electrical Flashcards
How many independent generating systems provide primary AC power to the UH-60?
Primary AC power is provided by two independent generating systems.
What APU generator output parameters does the APU Generator Control Unit (GCU) monitor?
The APU Generator Control Unit monitors:
over-voltage
under-voltage
feeder fault
under-frequency.
What components does the No.1 Junction Box contain?
The No. 1 Junction Box contains:
No.1 generator contactor (K1)
current transformer (T-13)
current limiters (CL4, 5, 6)
one test receptacle.
What is the purpose of the 60 ampere current limiters?
Protect the operating generator from excessive overloading during transfer operations.
What external AC inputs does the external power monitor panel monitor?
The external power monitor panel monitors:
under-voltage
over-voltage
under-frequency
over-frequency
correct phase rotation
The AC electrical system consists of what 3 types of power?
The AC electrical system consists of:
primary AC power
auxiliary AC power
external AC power
The No. 1, No. 2, and the APU generator control units continuously monitor and regulate generator output to provide what 6 functions?
The No. 1, No. 2, and the APU generator control units continuously monitor and regulate generator output to provide:
voltage regulation
current regulation
over-voltage protection
under-voltage protection
feeder fault protection
under-frequency protection.
The AC bus tie contactor (K-4) provides three-phase AC power from the . . or . ., to the . _._buses.
The AC bus tie contactor (K-4) provides three-phase AC power from the APU generator, or external AC power receptacle, to the AC primary buses.
On the pilot circuit breaker panel, the AC essential bus transfer (XFER) relay (K-8) provides connection of . ., B phase power to the . . bus.
On the pilot circuit breaker panel, the AC essential bus transfer (XFER) relay (K-8) provides connection of 115 VAC, B phase power to the AC essential bus.
What component supplies power to the DC essential bus when no AC electrical power is supplied to the helicopter buses?
The battery supplies power to the DC essential bus when no AC electrical power is supplied to the helicopter.
What component provides connection between the No. 1 and the No. 2 DC primary buses?
The DC bus tie contactor (K15) provides connection between the No. 1 and the No. 2 DC primary buses.
What is the percentage of charge in the battery that allows the DC ESS BUS OFF capsule to illuminate?
The charge in the battery supplying the DC ESS BUS falls to 35%, will cause the DC ESS BUS OFF capsule to illuminate.
What parameters does the Battery Analyzer/Conditioner not monitor?
The Battery Analyzer/Conditioner monitors Battery Voltage, temperature conditions, and charging circuit for battery charging.
What component provides primary DC power for helicopter equipment?
The converter provides primary DC power for helicopter equipment.
The primary DC system consists of what?
The primary DC system consists of:
two converters, supplied from the AC power system, and associated caution/advisory capsules.
The converters operate from . / VAC. three-phase, . Hz. power and provide outputs of . VDC. at no load to . VDC. at . AMPS.
The converters operate from 115/200 VAC, three-phase, 400 Hz power and provide outputs of 31 VDC at no load to 25 VDC at 200 amperes.
The DC bus tie current limiter (CL7), in the No. . . junction box, is a _. ._fuse that protects the connection between the . . and the . . primary DC buses.
The DC bus tie current limiter (CL7), in the No. 1 junction box, is a 100 ampere fuse that protects the connection between the No. 1 and the No. 2 primary DC buses.
The current limiter (CL7) operates when one primary DC bus is supplying the other DC primary bus as a result of a . . caused by a load short-circuits.
The current limiter (CL7) operates when one primary DC bus is supplying the other DC primary bus as a result of a converter failure caused by a load short-circuits.
The battery supplies power to what….when no AC power is supplied to the helicopter buses?
The battery supplies power to the DC essential bus when no AC power is supplied to the helicopter buses.
The battery always supplies what bus?
The battery always supplies the battery utility bus.
The No. 1 and No. 2 converters receive three-phase AC power from the No. 1 and No. 2 what? With both converters operating normally, the No. 1 converter supplies the . . bus and the No. 2 converter supplies the . . bus.
The No. 1 and No. 2 converters receive three-phase AC power from the No. 1 and No. 2 AC primary buses. With both converters operating normally, the No. 1 converter supplies the No. 1 DC primary bus and the No. 2 converter supplies the No. 2 DC primary bus.
If the No. 1 converter fails and its output drops to zero, No. 1 DC primary bus contactor (K16) . . DC power from the No. 2 DC primary bus is applied through the normally closed auxiliary contacts of contactor K16 to . . DC bus tie contactor (K15). With contactor K15 energized, DC power from the No. 2 DC primary bus is applied through the . . to supply the No. 1 DC primary bus.
If the No. 1 converter fails and its output drops to zero, No. 1 DC primary bus contactor (K16) de-energizes. DC power from the No. 2 DC primary bus is applied through the normally closed auxiliary contacts of contactor K16 to energize DC bus tie contactor (K15). With contactor K15 energized, DC power from the No. 2 DC primary bus is applied through the 100 amp current limiter to supply the No. 1 DC primary bus.
The . . AC power is applied from the external power receptacle through the normally closed main contacts of contactor K3, the energized main contact of contactor K4, and the normally closed main contacts of contactor K2 to supply the . . primary bus. The No. 1 AC primary bus is supplied through current limiters . . and the normally closed main contacts of contactor K1. The No. 1 AC primary bus supplies 115 VAC, . . power, through the AC ESNTL BUS SPLY circuit breaker, to the coil and contacts of AC essential bus XFR relay K8. With relay K8 energized, and 115 VAC, B phase power is supplied to the AC essential bus. The . . applies 115 VAC, B phase power to an autotransformer that supplies 26 VAC to navigation instrument loads.
The three-phase AC power is applied from the external power receptacle through the normally closed main contacts of contactor K3, the energized main contact of contactor K4, and the normally closed main contacts of contactor K2 to supply the No. 2 AC primary bus. The No. 1 AC primary bus is supplied through current limiters. CL1, CL2, and CL3 and the normally closed main contacts of contactor K1. The No. 1 AC primary bus supplies 115 VAC, B phase power, through the AC ESNTL BUS SPLY circuit breaker, to the coil and contacts of AC essential bus XFR relay K8. With relay K8 energized, and 115 VAC, B phase power is supplied to the AC essential bus. The AC essential bus applies 115 VAC, B phase power to an autotransformer that supplies 26 VAC to navigation instrument loads.
The battery switch is what kind of switch?
2 poles
