Vacuum Circuit Breaker Coil Temperature Control
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Solution Overview
Problem
Vacuum circuit breakers face challenges in maintaining consistent contact switching speed due to temperature changes affecting the resistance of drive coils and capacitors, leading to deviations from the operational duty of completing three cycles within 50 msec.
Innovation Solution
The electromagnetic operation device incorporates temperature sensors to measure and control the current flowing through the drive coils and capacitors, using temperature-correction indication units to adjust the charge voltage and ensure consistent operation speeds regardless of temperature fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If temperature changes occur in the drive coil and drive capacitor, then the resistance and current characteristics change, but the contact switching speed becomes unstable and deviates from the operational duty
Solution Approach 1:
The patent employs feedback control by measuring the actual current through the drive coil and comparing it with the target current value. Based on this comparison, the control system adjusts the charging voltage of the capacitor to maintain the current within the specified range, thereby stabilizing the contact switching speed despite temperature variations.
Solution Approach 2:
The patent dynamically adjusts the charging voltage parameter of the capacitor based on temperature conditions and measured current values. By changing this electrical parameter, the system compensates for temperature-induced resistance changes in the drive coil, ensuring the current remains within the optimal range for consistent switching performance.
2Speed
If the current through the drive coil is increased to maintain switching speed at high temperatures, then the switching speed is maintained, but excessive current may cause overheating or damage
Solution Approach 1:
The control system continuously monitors the actual current through the drive coil and adjusts the charging voltage accordingly. This feedback mechanism ensures that the current is increased only to the extent necessary to maintain switching speed, preventing excessive current that would cause overheating, while also preventing insufficient current that would reduce switching speed.
Solution Approach 2:
The patent implements dynamic adjustment of the charging voltage based on real-time temperature and current conditions. Rather than using a fixed high current setting, the system adaptively modulates the current level to match the actual operating conditions, maintaining optimal switching speed while minimizing thermal stress on the drive coil.
3Reliability
If the charging voltage is increased to compensate for capacitor performance degradation at high temperatures, then the current is maintained, but the risk of overvoltage and component damage increases
Solution Approach 1:
The control system uses feedback from current measurements to determine the appropriate charging voltage level. Rather than applying a fixed high voltage to compensate for capacitor degradation, the system calculates and applies only the necessary voltage to achieve the target current, thereby maintaining reliability while minimizing overvoltage risk to the capacitor and other components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively stabilizes the contact switching speed, enabling vacuum circuit breakers to meet the operational duty of completing three cycles within 50 msec, even with temperature changes, thus ensuring reliable and efficient operation.
Implementation Method 1
an electromagnetic operation device for a vacuum circuit breaker that controls a contact-switching operation of a vacuum switch tube used in the vacuum circuit breaker, by means of a driving force using electromagnetic force
Implementation Method 2
a first temperature sensor that measures a temperature surrounding the closing drive coil
Implementation Method 3
temperature changes affecting the resistance of drive coils and capacitors
Data Source
AI summary
There is provided an electromagnetic operation device for a vacuum circuit breaker, which controls by its electromagnetic operation, a speed of contact switching operation of a vacuum switch tube used in the vacuum circuit breaker, the electromagnetic operation device including a closing drive coil for the vacuum switch tube; and a first temperature sensor that measures a temperature surrounding the closing drive coil, wherein a current caused to flow through the closing drive coil is controlled based on the temperature measured by the first temperature sensor.