AC Power Supply Systems Flashcards Preview

AGK - Electrics > AC Power Supply Systems > Flashcards

Flashcards in AC Power Supply Systems Deck (10)
Loading flashcards...
1

Twin freq wild system

Comes form 2 engines

2 separate bus bars

2

Constant freq systems can be subdivided into

Spilt busbar systems

Parallel busbar systems

3

Before external power can be applied it is checked for

Correct voltage
Correct freq (400Hz)
Correct freq ABC
No other power sources feeding AC busbar (dead busbar sensing)

Can’t have ships power and external power

4

GCU houses

Generator control unit
Houses - voltage regulator,freq control, protection circuits

5

Differential protection

Hoops transformers will isolate the AC generators if the differential fault occurs - gets grounded

6

GCB

Connects generator to its individual busbar

Big switch, mechanically latched

7

BTB

Bus tie breakers - tie each busbar to each other - connects them together

8

GFR

Generator field relay - generates current to the exciter - generator on/off switch

9

Spilt busbar has no paralleling

AC power

Source of the system does not enter automatically - when it reaches the correct voltage and frequency - must be manually switched on

10

Spilt busbar system - what takes priority

Source AC power being connected to a generator bus takes priority