New Circuit Breaker Inspections and Test

Summary

This 30-minute DVD introduces many of the inspections and tests that are typically performed on new circuit breakers. Circuit breakers protect electrical power systems by interrupting excessive currents and by switching source, load, and exciting currents. The proper operation of a circuit breaker is ensured by thorough inspection and testing.

Training Sessions

Receiving – 10 minutes
Identifies common types of circuit breakers. Identifies various types of circuit breaker operating mechanisms. Describes what to check during a typical circuit breaker acceptance inspection.

Installation – 5 minutes
Describes how to move a circuit breaker and install it onto its pad. Describes how to move circuit breaker bushings.

Post-Installation Inspection – 5 minutes
Explains why it is important to document the status of a circuit breaker. Describes typical mechanical checks of a circuit breaker. Describes typical mechanical checks of a circuit breaker's operating mechanism.

Proof Tests – 10 minutes
Explains what proof tests are. Describes the purpose and principle of circuit-breaker time travel tests. Describes the purpose and principle of a circuit breaker contact resistance test. Describes the purpose and principle of a circuit breaker insulation resistance test. Describes the purpose and principle of a circuit breaker power factor test. Describes the purpose and principle of a circuit breaker hi-pot test.

Support Materials Available

Student workbook, instructor guide.