Load Circuit Current Profiling for Selective Overload Control
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Solution Overview
Problem
Existing installation control systems face challenges in efficiently managing current distribution and power capacity limits, leading to potential overloads and unnecessary shutdowns due to inadequately set tripping parameters in circuit breakers, which can result in damage or failure of technical installations.
Innovation Solution
A method that monitors current variations in load circuits during a learning phase to derive significant current profiles and tolerance ranges, and continuously adjusts current supply during operation to prevent exceeding power capacity limits, using a control unit to actuate switch units and reduce or switch off current in load circuits that exceed normal power requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If circuit breakers with fixed tripping parameters are used to protect load circuits, then load circuits are protected against overloads and short-circuits, but the tripping accuracy is poor and delays occur due to wide tolerances
Solution Approach 1:
The patent replaces fixed tripping parameters with dynamically adjustable parameters that adapt to the actual operating conditions of load circuits. The control unit continuously monitors current consumption and automatically adjusts tripping thresholds based on learned operational patterns, eliminating the wide tolerances and delays inherent in fixed-parameter circuit breakers.
Solution Approach 2:
The system implements a feedback mechanism where the control unit continuously monitors the actual current consumption of load circuits and uses this information to adjust tripping parameters. The measured current values feed back to the control unit, which optimizes the tripping characteristics in real-time, thereby improving both reliability and precision simultaneously.
2Productivity
If tripping parameters are set high to avoid unnecessary shutdowns, then continuity of operation is improved, but the power supply unit may be overloaded and total failure may occur
Solution Approach 1:
The control unit continuously monitors the total current consumption across all load circuits and compares it against the power supply unit's capacity. This feedback mechanism enables real-time adjustment of individual tripping parameters to ensure that the sum of currents never exceeds the power supply's maximum capacity, thereby maintaining both continuity and safety.
Solution Approach 2:
The patent merges the monitoring and control functions for multiple load circuits into a single integrated control unit that manages the overall current distribution. By combining the control of individual circuit protection with global power supply monitoring, the system optimizes the balance between maintaining operation continuity and preventing total overload failure.
3Speed
If electronic circuit breakers with rapid tripping are used, then protection speed is improved, but false tripping occurs due to inadequately set parameters
Solution Approach 1:
The control unit performs preliminary learning during a monitoring phase to establish the normal operating current profiles of each load circuit before enabling protective tripping. This preliminary action allows the system to distinguish between normal current variations and actual fault conditions, enabling rapid response to real faults while avoiding false tripping during normal operation.
Solution Approach 2:
The system uses continuous feedback from current sensors to dynamically adjust tripping decisions. By comparing real-time current measurements against the learned operational patterns, the control unit can rapidly respond to actual overloads while ignoring transient current spikes that fall within normal operational ranges, thereby eliminating false tripping.
4Reliability
If individual load circuits are protected independently, then selective protection is improved, but the power supply unit's overall current distribution is not optimized
Solution Approach 1:
The patent merges individual circuit protection with global power supply management in a unified control system. The control unit simultaneously monitors each load circuit for selective protection and tracks the total current distribution to optimize overall power utilization, achieving both selective protection and efficient current distribution concurrently.
Solution Approach 2:
The control unit uses feedback from both individual circuit sensors and total power supply monitoring to make coordinated control decisions. This dual feedback mechanism enables the system to maintain selective protection for individual circuits while simultaneously optimizing the overall current distribution to maximize power supply efficiency and prevent total overload.
Data Source
AI summary
Method for monitoring and controlling current distribution in load circuits of an installation control system of a technical installation, wherein a predetermined and constant output voltage is provided by a clocked power supply and distributed to the load circuits, where load circuits are protected by a switch actuated by a controller, a variation of the current in each load circuit is measured during a learning phase, a significant current profile with an associated tolerance range is derived and associated with the respective load circuit from the measured current variation which is continuously monitored by the control unit and a check is performed to determine whether a power capacity limit is reached by the clocked power supply while operate the installation, and the current consumed load circuits is reduced and/or switched off by actuating switches in load circuits in which a current variation exceeds an upper limit of the tolerance range.