Circuit Breaker Station Control via Synchronized Master Clock
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Solution Overview
Problem
Conventional control arrangements for circuit breaker stations require extensive cabling and complex selection arrangements, making them cumbersome and costly, especially in complex bus structures and distributed units, which complicates the engineering efforts and restricts bus structure options.
Innovation Solution
A control arrangement with a central synchronized clock system that calculates precise switching times for each circuit breaker based on measured voltages, currents, and positions, communicating these times directly to distributed circuit breaker operating units via a process bus like IEC61850 or EtherCat, reducing the need for complex cabling and enabling more advanced algorithms for switching optimization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If each synchronization device is fed with the same voltage reference via extensive cabling, then the switching transients can be reduced through synchronous switching, but the cabling requirements and device complexity increase significantly
Solution Approach 1:
The patent introduces a master clock as an intermediary time reference that distributes synchronized timing signals to all circuit breaker operating units. This master clock acts as a mediator that eliminates the need for extensive interconnections between individual synchronization devices, as each unit receives timing information from the central master clock through the existing process bus system.
Solution Approach 2:
The master clock serves multiple functions simultaneously: it provides time synchronization for all circuit breakers, generates switching delay calculations, and distributes timing commands through the process bus. This multi-functional approach replaces the need for separate synchronization devices at each circuit breaker location, reducing overall system complexity while maintaining synchronous switching capability.
2Reliability
If conventional synchronization devices are used for each circuit breaker, then switching transients are reduced, but the cost and cabling requirements increase with the number of circuit breakers
Solution Approach 1:
The patent merges the synchronization function from multiple individual devices into a single master clock that serves all circuit breakers. By combining these functions centrally, the system eliminates redundant cabling and reduces the quantity of physical connections required, as the master clock distributes timing signals to all operating units through the shared process bus infrastructure.
3Adaptability or versatility
If complex bus structures are implemented with distributed synchronization units, then system flexibility is improved, but the engineering complexity and cabling requirements increase
Solution Approach 1:
The master clock serves as a central intermediary that simplifies the control architecture for complex bus structures. By providing a unified time reference that all distributed operating units can access through the process bus, the system maintains flexibility in bus configuration while reducing engineering complexity, as each distributed unit independently receives timing commands without requiring complex inter-unit synchronization wiring.
Data Source
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AI summary
A control arrangement for a circuit breaker station (201) includes a central control system (213) for the overall control of the circuit breaker station, and, for each of the circuit breakers, a circuit breaker operating unit (217) connected to the central control system to obtain switching instructions and to the respective circuit breaker to control the operation thereof, wherein the central control system and the circuit breaker operating units have each a local clock, all clocks being synchronized with one another. The central control system is, during use, arranged to calculate a point of time for switching each of the circuit breakers based on measured voltages, currents, and circuit breaker positions, and to send the point of time in a switching instruction to the circuit breaker operating unit.