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Extra High Voltage Circuit Breaker Monitoring and Approach to the Concept of Maintenance on Demand

Pittsburgh, IEEE Switchgear November 1999 - 2. . . . . Processescontrolled. Microprocessors. DeregulationCompetitiveEnvironment. . Lead to increase of: . . . . Availability. Reliability.

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Extra High Voltage Circuit Breaker Monitoring and Approach to the Concept of Maintenance on Demand

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    2. Pittsburgh, IEEE Switchgear November 1999 - 2

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    6. Pittsburgh, IEEE Switchgear November 1999 - 6 Description : Local displays LCD (3 1/2 digits): Displays the temperature compensated pressure at 20°C: i.e. a density. LEDs display alarms and warnings: - P1 threshold = refilling pressure & alarm, - P2 threshold = lock-out pressure & alarm, - T1 advance warning (low leakage rate), - T2 advance warning (high leakage rate), - Low temperature (liquefaction), - Self-diagnostic OK.

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    8. Pittsburgh, IEEE Switchgear November 1999 - 8 Example: Circuit-breaker installed in the New Mexico desert: Effect of wide temperature variation (30°C) between day and night

    9. Pittsburgh, IEEE Switchgear November 1999 - 9 Example: Breaker at James Bay (Northern Quebec) When, exceptionally, temperature falls below the liquefaction point: A conventional densimeter will activate the P2 threshold (refilling required), CBWatch1 will send the message: Temperature too low. Do not refill.

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