PND Chapter 5

What is the purpose of circuit breakers in the electrical system?

• To connect different generators

• To turn off electricity in case of a problem

• To increase voltage

• To generate electricity

What does a switchboard serve as in the electrical distribution system?

• A power generator

• A central hub for connecting generators

• A type of circuit breaker

• A distribution panel

What is one of the function of the Power Management System (PMS)?

• To generate electricity

• To monitor voltage levels

• To control generator and prime mover

• To distribute power to consumers

What happens in the Non Essential Consumer (NEC) mode?

• Essential users are prioritized over non-essential users

• Only essential users are allowed to operate

• Non-essential users receive more power

• All users are prioritized equally

What is required for generators to be connected without causing damage?

• Different voltages

• Synchronization of frequency and voltage

• Manual control of each generator

• Independent operation

Which of the following is NOT a mode of operation for the PMS?

• Semi

• Auto

• Dynamic

• Manual

What does breaker discrimination help prevent?

• Widespread outages during minor faults

• Under voltage conditions

• Overloading the main switchboard

• Damage to generators

What is the role of distribution panels (DP) in the system?

• To monitor voltage levels

• To generate electricity

• To direct power to consumers

• To connect generators

What is the primary function of the Emergency Switchboard?

• To monitor electrical loads

• To provide backup power in case of main switchboard failure

• To supply power to non-essential equipment

• To control generator synchronization

PMS - ​ The four modes of operation are:

1. 1. ​ (a)   - PMS has no control of the geny or the CB's.

2. 2. ​ (b)   - Geny Start / Stop and CB On / Off buttons at DEIF are functional

3. 3. ​ (c)   - Controls changeover from generator to shore connection. Only Possible with ONE generator below 277KVA.

4. Mode ​ (d)   - Allows for LOAD dependent / Self load share / Start Priority selection / Blackout Start sequence.

• Manual
• Hand Pump
• SEMI
• Sharing
• Shore
• Base
• AUTO
• Self