HV Electrical Distribution

Question 1

HV

Answer 1

• Four generators are fitted on the type 45

* Two are driven by gas turbine engines.

Question 2

Gas Turbine generators

Answer 2

The GT driven generators produce:
- 4.160 kV, 60 Hz, 3Ø and have a capacity of 22 MW
-used to provide power for the whole ship.
In normal operation, only one gas turbine generator is operating.

Question 3

HV electrical Distribution

Two are driven by Diesel engines

Answer 3

The Diesel driven generators produce:

• 4.160kV, 60Hz, 3Ø and have a capacity of 2 MW.
• Will auto start if the gas turbine generator output drops below a certain level.
• Provide power to start the second gas turbine.
• Provide power for essential systems until the second gas turbine Genesis online.

Question 4

HV SYSTEM HAS TWO SWITCHBOARDS

Answer 4

PORT switchboard

STARBOARD switchboard

Question 5

GT circuit

Stage 1

Answer 5

GT driven generator output is fed onto a 4, 16 kV bus bar in each switchboard section.

As usual Fed through their own supply breakers.

Question 6

Stage 1

Answer 6

Diesel driven generator output is also fed into a 4.16kV bus bar in each switchboard.

The bud bar linking breakers and interconnecting breakers are closed all the time.

Question 7

Stage 2

Answer 7

The HV is connected to an HV harmonic filter.

This is done through their own harmonic filter feeder breakers.

Question 8

Harmonic filters

Answer 8

• Harmonic filters are used to ensure the quality requirements of the power supplies.
• These harmonic filters smooth the sine wave of the voltage supply.
• These harmonic filters are cooled via a dedicated air to water heat exchanger.
• The heat exchanger is fed from the ship’s chilled water system.
• In an emergency seawater can be used.
• The heat exchangers must be flushed through following the emergency use of seawater.

Question 9

Electrical propulsion

Answer 9

• The Type 45 has an integrated electrical propulsion system (IEP).
• The IEP is powered from the 21MW capacity turbine generators.
• The IEP system is commonly referred to as an INTEGRATED ELECTRIC DRIVE.

Question 10

Stage 3

Answer 10

• Output of the 21MW generator supplied to the bus bar is connected to the 19MW advanced induction propulsion motor.
• This is done through the propulsion motor feeder breaker.