Protection Quiz 1

Reason For Protecting The Power System

• To protect power system

• To ensure safety for consumer

• To develop hand skill

• To install power system devices

Reason For Protecting The Power System

• make installation works become easier

• Repairing works is unnecessary

• minimize damage and repair cost

• Number of fault in power system will be reduced

Reason For Protecting The Power System

• Repairing works is unnecessary

• make installation works become easier

• to develop hand skill

• to protect power system equipment

Define Reliability

• Able to detect smallest changes

• provide maximum protection at minimum cost

• Responds to specific fault only

• Device must function consistently when fault occur

Define sensitivity

• detect even the smallest fault

• will operate as fast as possible

• Responds to specific fault only

• easy to install, maintain and use

Choose method of extinguishing the arc in circuit breaker

• High temperature method

• High power method

• High current method

• High resistance method

Choose method of extinguishing the arc in circuit breaker

• Low speed method

• Low resistance method

• Low voltage method

• Low flow method

Choose the function of Fuse

• splitting the arc

• prevents an electrical object from receiving too much current

• Eliminate the arc

• Cooling the arc

Choose the function of Fuse

• designed to melt and separate if over-current

• lengthen the gap between live and neutral wire

• Cooling the arc

• Splitting the arc

Which of the below is NOT type of Fuse

• HRC Fuse

• Ohmic fuse

• Cartridge fuse

• Rewireable fuse