Monitoring

It is widely recognized that the concept of periodic equipment maintenance is becoming obsolete. A reliability centered program, built around condition monitoring, data analysis and spare parts inventory management, is a more effective methodology for cost effectively managing substation assets. Successful reliability centered maintenance programs require an information system. For power circuit breakers, the network must include condition monitors, circuit breaker engineers, field service and spare parts. ABB has invested in people, material, software and hardware to provide all of these elements.

ABB utilized its breaker design expertise in the development of the most advanced condition monitoring algorithms available in the industry. The ABB Circuit Breaker Sentinel™ (CBS) not only collects and stores data but also employs sophisticated mathematical processing and analysis to provide a complete picture of the breaker condition. The ability to interpret and present this data in a useful way is what sets ABB’s monitoring unit apart from the rest.

Functions
The CBS is a diagnostic and monitoring system for single pressure SF6 power circuit breakers rated 38 kV and above. The CBS monitors interrupter wear, integrity of the SF6 gas system, the circuit breaker mechanical system, the electrical control system and auxiliaries. It consists of a modular microprocessor unit and sensors. The unit is housed in a NEMA-1 enclosure, which is installed inside the circuit breaker control cabinet or in an additional enclosure mounted on the side of the control cabinet.

The following conditions are monitored by the CBS:
• Coil continuity
• Total travel
• Contact velocity
• Reaction time
• Coil energization time
• Contact wear
• Auxiliary nozzle wear
• Main nozzle wear
• Trip count
• RMS current
• Tank/gas temperature
• Mechanical/cabinet temperature
• Leak rate (5 time spans)
• Heater off at low temperature
• Heater on at high temperature
• Heater off (heater w/o thermostat)
• Pump starts w/o operation
• Pump starts with operation

The user interface software, CB Insight™, allows the user to access and download information, upgrade software and change the set point values.

Benefits
• Monitors circuit breaker parameters necessary to assess the availability of this equipment to perform its switching functions.
• Advises users when to maintain their circuit breakers based on switching history, duty and number of operations.
• Reduces the probability of performing unnecessary dismantling of the circuit breaker, which often occurs when maintenance practices are based solely on fixed time intervals or when they are based on incomplete information of its switching history.
• Alerts to conditions that may compromise correct operation of the circuit breaker before a failure can occur.
• Optimizes service and outage time by identifying parameters that have changed beyond established limits.
• Reduces costs associated with downtime and maintenance. Users maintain or repair only items that require it.
• Provides local and remote access to information of key parameters related to circuit breaker performance, eliminating the need for substation visits to check circuit breaker condition.
• Saves in travel time and personnel expense. 
• Records and displays, in the user interface program, CB Insight™, the timing values and travel curves for each circuit breaker operation. 

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Brochure for the full CBS Monitoring System  Feb 14, 2012, 4:44 PM Reed Miller
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Brochure for the CBS-F6, monitoring for SF6 only  Feb 14, 2012, 4:44 PM Reed Miller
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Field Experiences with HV Circuit Breaker Condition Monitoring  Feb 14, 2012, 4:40 PM Reed Miller
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