Research Centre BRESLER www.ic-bresler.ru Modern Circuit Breaker Protection and Control Reporter:Andrei Podshivalin, Head of Department, PhD Research Centre.

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Research Centre BRESLER Modern Circuit Breaker Protection and Control Reporter:Andrei Podshivalin, Head of Department, PhD Research Centre Bresler A.Podshivalin, S.Ivanov

Page 2 Research Centre BRESLER Date: © Research Centre BRESLER Introduction Circuit Breaker Protection and Control Modern Conventional solution New requirements: dependability and security New diagnostics functions

Page 3 Date: Research Centre BRESLER © Research Centre BRESLER Implementation of BPC RPBPC Separate protection and control IEDs BPC1BPC2 12 RP+BPC Single IED RP Separate protection and control cubicles

Page 4 Research Centre BRESLER Date: © Research Centre BRESLER Basic functionality of BPC automatic reclosingautomatic reclosing with synchro-check/phasing manualmanual breaker control protectionbreaker opening initiated by protection breaker failurebreaker failure protection statebreaker state monitoring continuousbreaker coils protection against continuous current open phase protection and pole discrepancy protection for breakers with phase-segregated control

Page 5 Research Centre BRESLER Date: © Research Centre BRESLER Advanced functionality of BPC breaker tripping and mechanical capability estimation breaker opening/closing cycle time diagnostics breaker control circuit integrity monitoring

Page 6 Date: Research Centre BRESLER © Research Centre BRESLER Control circuit supervision Measurement instead of detection MV ? MA resistorsresistors in trip circuits binaryvulnerable binary inputs

Page 7 Research Centre BRESLER Date: © Research Centre BRESLER Higher reliability of control circuits No resistorsNo resistors – faster tripping Direct tripping by single protection contacts – faster tripping (the contact is protected by CBP) Independent action – higher dependability (separate event log) Protection 1 Protection 2 Coil CBP i

Page 8 Date: Research Centre BRESLER © Research Centre BRESLER Coil supervision Current level in the control circuit Rate of current rise in control circuit Breaker operation time

Page 9 Research Centre BRESLER Date: © Research Centre BRESLER Coil supervision (2) Circuit effective resistance is within the nominal range monitoringContinuous auxiliary voltage level monitoring SequenceSequence of events control: protection operation – current in a circuit R V Protection Current

Page 10 Research Centre BRESLER Date: © Research Centre BRESLER Breaker capability estimation mechanicalmechanical capability tripping capability GOST R According to GOST R Alternating-current circuit-breakers for voltages from 3 to 750 kV. General specifications User-definable characteristics signaling blocking

Page 11 Date: Research Centre BRESLER © Research Centre BRESLER Blocking in case of Breaker failure Slow transfer of the tripping command Fast switching and reliable blocking Breaker Protection & Control Trip command Coil Blocking Trip command Breaker Protection & Control Coil Tripping Trip command Failure signals

Page 12 Research Centre BRESLER Date: © Research Centre BRESLER Conclusion Improvements Improvements in modern devices comprehensive diagnostics of switch gear enhancedenhanced control circuits reliability blockingflexible blocking & signaling better maintenance planning 100% 0%