Phase-Controlled Switching Equipment for High Current Testing
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Solution Overview
Problem
Low voltage electrical equipment testing stations face challenges with low switching on/off current accuracy and stability, leading to issues like overvoltage, inrush current, and reduced equipment lifespan, due to random phase angles in high and medium voltage systems.
Innovation Solution
A low voltage and intense current phase-controlled switching equipment featuring a vacuum arc extinguish chamber, permanent magnet control device, and intelligent phase choosing controlled module, which allows precise control of switching on/off phases under system voltage waveforms, using electromagnetic coils, movable iron cores, and a transmission system to drive the switching process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If random switching on/off phases are used in high and medium voltage systems, then the switching operation is simple, but overvoltage and inrush current occur causing equipment damage and reduced reliability
Solution Approach 1:
The intelligent phase choosing controlled module performs preliminary analysis of system voltage waveform and pre-determines the optimal switching phase angle before execution. The module captures voltage waveform data, identifies zero-crossing points and peak values, and calculates the precise switching moment in advance, ensuring reliable switching without overvoltage or inrush current while maintaining controlled complexity through automated preprocessing.
Solution Approach 2:
The system implements feedback control by continuously monitoring the actual switching phase angle and comparing it with the target value. The intelligent phase choosing controlled module adjusts subsequent switching operations based on feedback from previous operations and real-time voltage waveform conditions, ensuring consistent reliability while adapting to system variations without requiring overly complex manual control.
2Reliability
If phase-controlled switching on is implemented to control switching phase angle, then overvoltage and inrush current are reduced, but switching on accuracy and stability deteriorate
Solution Approach 1:
The system replaces traditional mechanical timing and manual phase adjustment mechanisms with electronic control. The intelligent phase choosing controlled module uses electronic circuitry to detect voltage waveform characteristics, calculate optimal phase angles, and trigger switching operations with precise electronic timing. This substitution of electronic control for mechanical systems achieves high switching phase angle accuracy and stability while maintaining reliability, as electronic systems provide better precision and consistency than mechanical alternatives.
3Power
If traditional switching equipment is used, then the device structure is simple, but switching on/off current capability is insufficient for intense current applications
Solution Approach 1:
The switching equipment is segmented into distinct functional modules: the vacuum arc extinguish chamber for high-current switching, the permanent magnet controlled device for precise mechanical actuation, and the intelligent phase choosing controlled module for electronic control. This segmentation allows each module to be optimized for its specific function, enabling the system to handle intense switching currents while keeping overall complexity manageable through modular design. Each module can be independently tested, maintained, and replaced.
Solution Approach 2:
The system employs composite construction combining different materials and technologies: vacuum arc extinguish chamber using vacuum technology and special contact materials, permanent magnet controlled device using magnetic materials and precision mechanics, and electronic control module using semiconductor components. This composite approach enables the equipment to achieve high switching current capability (150 kA) by integrating the strengths of different technological domains while managing complexity through specialized component design.
4Measurement precision
If switching on accuracy is improved to ±0.2 ms stability, then test reliability is enhanced, but equipment complexity and manufacturing difficulty increase
Solution Approach 1:
The system achieves ±0.2 ms switching accuracy by replacing mechanical timing mechanisms with electronic control. The intelligent phase choosing controlled module uses electronic circuitry and microprocessors to generate precisely timed switching signals based on voltage waveform detection. This electronic approach provides the required ±0.2 ms accuracy while simplifying manufacturing compared to mechanical systems, as electronic components can be mass-produced with consistent precision and require less manual calibration and adjustment.
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
The equipment achieves high accuracy in phase-controlled switching with ±0.2 ms stability, supports currents up to 150 kA, and enhances test efficiency and reliability, meeting national and industry standards while preventing equipment damage.
Implementation Method 1
the intelligent phase choosing controlled module sending order to impose the switching on/off voltage and current on the electromagnetic coils of the permanent magnet controlled device via the lead wire to produce electromagnetic force after receiving switching on/off controlling signal
Implementation Method 2
The vacuum arc extinguish chamber comprises at least a movable contact and a isolated pull rod connected to the movable contact
Data Source
AI summary
The present invention relates to low voltage electrical equipment testing technique, more particularly, to a low voltage and intense current phase-controlled switching on equipment, comprising: a frame, at least an vacuum arc extinguish chamber, at least a permanent magnet control device and at least a intelligent phase choosing controlled module, with the vacuum arc extinguish chamber and the permanent magnet controlled device mounted on the frame, wherein the vacuum arc extinguish chamber comprises at least a movable contact and a isolated pull rods connected to the movable contact, and the permanent magnet controlled device comprises electromagnetic coils, movable iron cores and output shafts connected to the movable iron cores, and a transmission system is arranged to connect to the isolated pull rod and the output shaft, with the intelligent phase choosing controlled module electrically connected to the electromagnetic coils of the permanent magnet controlled device.