Capacitor Charging Control for Magnetic Actuators
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Solution Overview
Problem
Existing techniques for charging and monitoring capacitors used in magnetic actuator control mechanisms for medium or high voltage switchgear fail to efficiently charge the capacitors in minimum time, verify correct charge, detect faults, limit charging current, and prevent power supply tripping due to faults or errors, while also allowing capacitor reforming and generating alarms for anomalies.
Innovation Solution
A system comprising voltage and current regulators, a switch, and a converter to control the charging and monitoring of capacitors, allowing rapid charging, current limitation, fault detection, and capacitor reforming, with digital control of charging current and alarm generation for faults.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional charging techniques are used, then the capacitor can be charged, but the charging time is excessive and the current is not limited, risking capacitor damage
Solution Approach 1:
The patent implements dynamic charging current control through a regulator that continuously adjusts the charging current based on real-time capacitor voltage feedback. The current starts high for rapid charging then automatically reduces as the capacitor approaches full charge, optimizing both charging speed and safety. This dynamic adjustment prevents thermal runaway while minimizing charging time.
Solution Approach 2:
The system incorporates a feedback mechanism where the capacitor voltage is continuously measured and fed back to the current regulator. This feedback loop enables the regulator to automatically adjust the charging current magnitude based on the actual charging state, ensuring the capacitor is charged efficiently without exceeding safe current limits that could cause damage.
2Measurement precision
If leakage current measurement is implemented, then capacitor faults can be detected, but false fault detection occurs leading to excessive unavailability
Solution Approach 1:
The patent monitors the evolution of charging current parameters over time during the charging process. Instead of relying on single-point leakage measurements that may be inaccurate, the system analyzes changes in current magnitude and timing characteristics throughout the charging cycle to detect genuine faults while filtering out transient anomalies that would cause false alarms.
Solution Approach 2:
The system performs preliminary characterization of the capacitor's charging behavior during normal operation, establishing a baseline profile. This preliminary action enables the system to distinguish between normal variations in charging characteristics and actual fault conditions, reducing false fault detections and maintaining system availability.
3Productivity
If rapid charging is implemented, then charging time is reduced, but the charging current may exceed safe limits and damage the capacitor
Solution Approach 1:
The charging system dynamically adjusts the current magnitude during the charging process. Initially, high current is applied for rapid charging when the capacitor voltage is low and thermal stress is minimal. As the capacitor voltage increases and approaches the target value, the current automatically reduces, preventing thermal runaway and damage while maintaining maximum charging speed throughout the process.
Solution Approach 2:
The system incorporates protective measures in advance by implementing current limiting circuitry and monitoring mechanisms before charging begins. These precautions are built into the charging protocol to prevent harmful thermal stress from occurring in the first place, allowing rapid charging to proceed safely without risking capacitor damage.
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
Enables capacitors to be charged within a fixed time, detects anomalies quickly, corrects faults when possible, and prevents damage by limiting charging current, ensuring safe operation and avoiding unnecessary tripping or capacitor destruction.
Implementation Method 1
a capacitor making it possible to supplying electrical power to the electromagnetic control device
Implementation Method 2
an electromagnetic control device for moving the actuator from a first switching position to a second switching position
Data Source
Figure 1
Figure 2A~2D
Figure 3
AI summary
The device has a regulator (10) whose set point input is connected to output of a voltage set point supply unit (12) and output is connected to input of a current set point supply unit (12 '). Another regulator (11) comprises a measurement input, a set point input and an output and regulates the charge current of a capacitor (C). The set point input of the latter regulator is connected to the output of the current set point supply unit. A switch (13) is located between a power supply (14) and a terminal of the capacitor and controlled by the output of the latter regulator. Independent claims are also included for the following: (1) a system for controlling a magnetic actuator in an average or high voltage apparatus (2) a method for charging and monitoring a capacitor that is used for controlling a magnetic actuator during discharge.