low voltage is up to ..... VAC & ..... VDC & the risk is ............

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Extra-low voltage is up to ...... V the risk is ......

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Hazards of High voltage onboard ships are:

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Re-arrange the correct permit to work process

i-Perform work with controls

ii-Provide feedback and continuous improvement

iii- Analyze the Hazards

iv-Define the work scope

v-Develop and implement Hazard controls

Mention types of High voltage circuit breakers and how to evaluate its condition:

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List HV cables characteristics and safety requirements

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Summarize he different types of transforms used in case of high voltage

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What are the types of propulsion motors used on board ships, and their usages?

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Mention the different protection devices used for High Voltage system, showing its functions.

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What are the different HV measurements carried out for HV?

اكتب رقم السؤال وبجواره علامة صح او خطأ

1-Any Voltage used on board a ship if less than 1kV (1000 V) then it is called as LV (Low Voltage)

2- use higher voltages on board a ship increase in size of machineries and other equipment demands more electrical power

3- High voltage systems are usually earthed neutral and use current limiting resistors

4- Voltages greater than 50 v applied across dry unbroken human skin can cause heart fibrillation

5- Body resistance decreases with increased voltage level

6-15 mA can be fatal

7- using a permit-to-work scheme and isolation procedures together with life-line tests and earthing-down before any work is started

8- Before applying an IR test to HV equipment its power supply must be switched ON, isolated, confirmed dead by an approved live-line tester and then earthed disconnected for complete safety

9-Using test instruments when taking high voltage measurements can increase the risk of injury if the protective earth conductor is not connected

10- Transformer is a static device which transforms a.c. electrical power from one voltage to another voltage keeping the frequency same by electromagnetic induction.

-Mention the main data for supply shore connection

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-Summarize steps carried out before and during maintenance activity of high voltage equipment.

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During

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Draw a simple sketch of Electric Propulsion High Voltage System, show the main equipment

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