Exam Question
(a) What is high voltage and what are the high voltage equipment? (6)
(b) Briefly explain the safety requirements of high voltage systems (10)
Class 4 (4th Engineer)
MET
📅 Jun 2023
Reference Answer
### (a) High Voltage and High Voltage Equipment
#### Definition of High Voltage (HV)
In the context of marine engineering, High Voltage (HV) is defined as any nominal AC or DC voltage exceeding **1000V**. Systems operating at or below this threshold are classified as Low Voltage (LV). The use of HV is prevalent on vessels with high power demands, such as those with electric propulsion, large bow thrusters, reefer container ships, or large passenger vessels.
The primary advantage of using HV is derived from the fundamental power formula, $$P = V \times I$$. For a given power requirement (P), increasing the voltage (V) leads to a proportional decrease in current (I). This reduction in current provides significant benefits:
#### Definition of High Voltage (HV)
In the context of marine engineering, High Voltage (HV) is defined as any nominal AC or DC voltage exceeding **1000V**. Systems operating at or below this threshold are classified as Low Voltage (LV). The use of HV is prevalent on vessels with high power demands, such as those with electric propulsion, large bow thrusters, reefer container ships, or large passenger vessels.
The primary advantage of using HV is derived from the fundamental power formula, $$P = V \times I$$. For a given power requirement (P), increasing the voltage (V) leads to a proportional decrease in current (I). This reduction in current provides significant benefits:
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