Exam Question
(a) What is the purpose of Preferential Tripping system on ship's electrical network? (6)
(b) Explain the various stages of preferential trips including the loads connected to those stages. (10)
Class 4 (4th Engineer)
MET
📅 Dec 2024
Reference Answer
### (a) Purpose of the Preferential Tripping System
The Preferential Tripping System is a critical electrical protection and load management arrangement installed on a vessel's Main Switchboard (MSB). Its primary purpose is to prevent a total loss of electrical power, known as a blackout, during a sustained generator overload condition. It functions as an automated, multi-stage load-shedding system.
The key objectives are:
1. **To Ensure Continuity of Essential Services:** The system's fundamental goal is to maintain a continuous power supply to services and machinery vital for the safe navigation, propulsion, and habitation of the vessel. This is achieved by sacrificing non-essential loads to preserve power for critical ones.
The Preferential Tripping System is a critical electrical protection and load management arrangement installed on a vessel's Main Switchboard (MSB). Its primary purpose is to prevent a total loss of electrical power, known as a blackout, during a sustained generator overload condition. It functions as an automated, multi-stage load-shedding system.
The key objectives are:
1. **To Ensure Continuity of Essential Services:** The system's fundamental goal is to maintain a continuous power supply to services and machinery vital for the safe navigation, propulsion, and habitation of the vessel. This is achieved by sacrificing non-essential loads to preserve power for critical ones.
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