Circuit Breaker Control Device Timing Compensation
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Solution Overview
Problem
Existing control devices for electrical power systems face challenges in accurately executing operational commands for circuit breakers due to internal processing delays and communication delays in the control device, leading to suboptimal point-on-wave switching and potential equipment damage.
Innovation Solution
A control device that calculates an absolute point in time for operational commands, independent of internal processing and message transfer times, using a central processing unit to synchronize with output modules and compensate for circuit breaker operating times, ensuring precise timing for switching operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the CPU/DSP transmits a trip signal through the communication backplane or field/process bus to the output module, then the operational command is delivered to the circuit breaker, but delays are introduced in the communication process causing the circuit breaker to be tripped at the wrong point in time
Solution Approach 1:
The patent applies preliminary action by calculating the point in time when the operational command should be executed, taking into account the known message transfer time. The CPU/DSP determines the optimal switching point in advance and schedules the command transmission accordingly, so that despite the communication delay, the circuit breaker operates at the correct point on the voltage or current wave.
2Ease of operation
If the control device uses internal time for synchronization, then the operational commands are coordinated within the control device, but the accuracy is reduced due to internal processing delays and communication delays
Solution Approach 1:
The patent uses an intermediary approach by introducing a calculated time offset that mediates between the internal processing time and the desired external switching time. This offset acts as a compensation mechanism that bridges the gap caused by internal delays, allowing the system to maintain synchronization capability while achieving accurate timing despite the presence of processing and communication delays.
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a control device (4) for controlling a circuit breaker (11). The control device (4) comprises a central processing unit (7) and is arranged to communicate with an output module (9, 9') arranged to output operational commands to the circuit breaker (11). The output module (9, 9') comprises processing means (12) arranged to execute an operational command at a point of time received from the central processing unit (7). The invention also encompasses related methods.