Summary
This 52-minute DVD explains the basic operating principles of circuit breakers found in substations and switchyards. The fundamental concepts of arc extinguishing and circuit interruption are explained, and a variety of arc extinguishing mechanisms and circuit breaker operating mechanisms are examined. Identifies and describes the operation of six common types of arc interrupting mechanisms, and four common types of operating mechanisms.
Training Sessions
Introduction to Circuit Breakers - 8 minutes
Describes the main functions of a circuit breaker. Explains why arcs must be extinguished quickly. Describes the role of each of the following factors in extinguishing an arc in a circuit breaker: speed, distance, cooling, dielectric strength, zero current. Identifies four mediums commonly used in circuit breakers to help extinguish arcs.
Air-Magnetic and Air-Blast Circuit Breakers - 9 minutes
Identifies the main arc extinguishing features of a typical air-magnetic circuit breaker. Explains how the arc extinguishing features in an air-magnetic circuit breaker work to extinguish arcs. Identifies the main arc extinguishing features of a typical air-blast circuit breaker. Describes how the arc extinguishing features in an air-blast circuit breaker work to extinguish arcs.
Oil and Vacuum Circuit Breakers - 5 minutes
Identifies the main arc extinguishing features of a typical oil circuit breaker. Explains how the arc extinguishing features in an oil circuit breaker work to extinguish arcs.Identifies the main arc extinguishing features of a typical vacuum circuit breaker. Shows how the arc extinguishing features in a vacuum circuit breaker work to extinguish arcs.
Gas-Blast and Gas-Puffer Breakers - 8 minutes
Identifies the main arc extinguishing features of a typical gas-blast circuit breaker. Explains how the arc extinguishing features in a gas-blast circuit breaker work to extinguish arcs. Identifies the main arc extinguishing features of a typical gas-puffer circuit breaker. Shows how the arc extinguishing features in a gas-puffer circuit breaker work to extinguish arcs.
Solenoid and Motor/Spring Operating Mechanisms - 11 minutes
Identifies the main features of a typical solenoid circuit breaker operating mechanism. Explains how a solenoid operating mechanism works to operate a breaker. Identifies the main features of a typical motor/spring circuit breaker operating mechanism. Shows how a motor/spring operating mechanism works to operate a breaker.
Pneumatic and Hydraulic Operating Mechanisms - 11 minutes
Identifies the main features of a typical pneumatic circuit breaker operating mechanism. Explains how a pneumatic operating mechanism works to operate a breaker. Identifies the main features of a typical hydraulic circuit breaker operating mechanism. Shows how a hydraulic operating mechanism works to operate a breaker.
