LV Electrical Distribution

Question 1

LV electrical Distribution
Stage 1 (circuit)

Answer 1

•2MW generator output is fed into the 4, 16kV bus bar in the HV switchboard.

Fed through their own supply breakers.

Question 2

LV Generator

Answer 2

2MW generator output is then fed to a transformer.

Question 3

LV Electrical distribution
Stage 2 (Circuit)

Answer 3

2MW generator output is then fed to a ship’s service transformer.

Fed through a transformer feeder breaker.

Question 4

The two LV switchboards

Answer 4

The LV system has two switchboards
-Starboard
-Port
Each switchboard has a single bus bar.

Question 5

Lv electrical distribution
Stage 3 (Circuit)

Answer 5

Each transformer output is fed to a bus bar in the LV switchboard.

Fed through a transformer supply breaker.

Question 6

Lv electrical distribution 
Stage 4 (Circuit)

Answer 6

Power from the bus bar is fed to the EDP’s.

Fed through feeder breakers.

Question 7

LV electrical distribution

Stage 5

Answer 7

The LV bud bars are connected to the LV Harmonic filters.

Via harmonic filter feeder breakers.

These LV harmonic filters serves the same purpose as the HV harmonic filter.

Question 8

LV electrical distribution

Stage 6

Answer 8

When I’m port, power is drawn from shore supply if available.

This is done through a shore supply/ship alongside breaker.

Question 9

Stage 7

Answer 9

The switchboards can be linked together using interconnecting breakers.

Question 10

LV Synchronising

Answer 10

Ships LV system can be synchronised with shore supply to transfer load between ship and shore.

This facility is provided by an extension to the LV switchboard of the DG synchronising facility at the HV switchboard.

The HV system has no facilities to transfer load with the LV shore supply.

Normal control of this equipment is via the:
Platform management system (PMS)
Electrical power management system (EPMS).