Contactor Phase Offset Control for Arc Energy Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing contactor technologies either suffer from the high complexity and cost of point on wave control systems or the random operational characteristics of unintelligent devices, which are not suitable for smaller applications and do not provide adequate protection against equipment damage.
Innovation Solution
A contactor design that combines the mechanical switching of two poles offset from the third pole with point on wave technology, using a single coil controller and sine wave monitor to determine optimal switching times, reducing complexity and cost while minimizing arc energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If point on wave technology is implemented to control all three phases, then arc energy is minimized and contactor life is extended, but system complexity and cost increase significantly
Solution Approach 1:
The patent segments the control approach by applying point-on-wave technology to only one phase while using conventional control for the other two phases. This segmentation allows the system to capture the arc energy reduction benefits of intelligent control without implementing complexity across the entire three-phase system, thereby improving contactor life while limiting the increase in system complexity.
Solution Approach 2:
The patent applies partial action by implementing point-on-wave control for only a portion of the phases (one out of three) rather than the complete set. This partial implementation provides sufficient arc energy reduction to extend contactor life while avoiding the full complexity and cost burden of implementing intelligent control across all phases.
2Loss of energy
If point on wave technology is implemented, then arc energy is minimized, but cost and complexity make it unsuitable for smaller applications
Solution Approach 1:
The patent segments the control strategy to apply advanced point-on-wave technology to only one phase while using simpler conventional control for the other two phases. This segmentation reduces the overall system complexity and cost, making the solution economically viable for smaller applications while still achieving significant arc energy reduction through the intelligent control of one phase.
Solution Approach 2:
The patent implements partial action by applying point-on-wave control to only one phase rather than all three phases. This partial implementation achieves sufficient arc energy minimization to protect equipment while keeping the control system simple and cost-effective enough for smaller applications.
3Device complexity
If conventional unintelligent contactors are used, then cost and complexity are low, but random switching causes equipment damage
Solution Approach 1:
The patent segments the control approach by implementing point-on-wave technology for one phase to eliminate the harmful random switching effects, while maintaining conventional simple control for the other two phases. This segmentation provides adequate equipment protection without requiring complex control systems across all phases.
Solution Approach 2:
The patent applies partial action by implementing intelligent point-on-wave control for only one phase rather than all three. This partial implementation provides sufficient protection against equipment damage caused by random switching while keeping the overall system cost-effective and simple enough for smaller applications.
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 extends the operational life of contactors, reduces the probability of equipment damage, and provides point on wave control benefits to smaller devices at a lower cost and complexity, effectively balancing the random characteristics of unintelligent contactors with advanced control systems.
Implementation Method 1
using a single coil controller and sine wave monitor to determine optimal switching times
Implementation Method 2
using a single coil controller
Implementation Method 3
the contactor connects or disconnects the electrical flow
Data Source
AI summary
A system and methods providing for minimizing the arc energy delivered to the pads of a plurality of contactors using a single control coil based on monitoring the electrical sine waves of the three alternating current electrical poles and calculating the instant to energize or deenergize a single control coil. The remainder of the contactors will make or break based on an offset in time from the making or breaking of the control contactor.