Circuit Breaker Monitoring

A high voltage circuit breaker is a critical component to the reliability and safety of any power system. There are three systems prone to fail in the circuit breaker:

Mechanical System

Did you know?

The majority of breaker failures can be attributed to a malfunction of one or more components in the mechanical system. For example, long periods of inactivity can lead to degradation of the mechanical systems lubrication which leads to slowed operating times and frictional wear.

Electrical System

Did you know?

The electrical systems in circuit breakers require relays, control wiring, switches, fuses and CTs to ensure proper operation. Markers of potential failure are difficult to detect, resulting in failure to open/close on command. For example, a cabinet heater failure could lead to corrosion.

Insulating System

Did you know?

The insulating system consists of the bushings and the insulating medium of the main tank which could be SF6, mineral oil, vacuum or air used to extinguish arcing during switching operations. Monitoring of SF6 insulating systems is the highest priority of all insulating mediums.

Breaker Performance Monitor

Breaker Performance Monitor (BPM)

Dynamic Ratings offers online circuit breaker monitoring and SF6 gas density monitoring through the Breaker Performance Monitor. This online circuit breaker monitor is ideally suited for implementing predictive maintenance, maintenance deferral, condition based maintenance and increased environmental protection from SF6 gas leaks. The BPM monitors the condition of the main contacts, mechanism and dielectric, and logs the following information during circuit breaker operation:

  • Trip Time (mS) (also known as Opening Time)
  • Arc duration (mS) (phase segregated)
  • Clearing Time (mS) (also known as Interrupting Time)
  • Cumulative I2 x T or I x T on the main contacts (phase segregated) from arcing
  • Restrike Occurrence (phase segregated)
  • Operation Counts