Static Transfer Switch Phase Matching for Low-Disruption Power Transfer

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional static transfer switches face challenges in minimizing electrical disruptions during power transfers due to phase angle differences between power sources, which can cause undesirable current flow changes.

Innovation Solution

A static transfer switch system that includes a phase angle module to sense the phase angles of power sources and determine which phase has a phase angle closest to a target, allowing for controlled switching to minimize disruptions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional static transfer switches perform power transfer between power sources, then power supply continuity is maintained, but electrical disruptions occur due to phase angle differences

Engineering Contradiction:

Improvepower supply continuityVSAvoidelectrical disruptions

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The system performs preliminary sensing of phase angles of both power sources before the transfer occurs. The controller identifies which phase of the backup power source has a phase angle closest to the target phase angle of the primary power source, and pre-configures the switches to minimize phase angle difference during the actual transfer, thereby reducing electrical disruptions.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system dynamically adjusts the switching configuration based on the measured phase angle parameters. By changing which phases are connected to which outputs based on real-time phase angle measurements, the system optimizes the transfer to minimize phase angle differences and resulting electrical disruptions while maintaining continuous power supply.

Inventive Principle:

Principle #35Parameter changes

2Object-affected harmful factors

If phase angle sensing and controlled switching is implemented, then electrical disruptions are minimized, but device complexity increases

Engineering Contradiction:

Improveelectrical disruptionsVSAvoidswitching control complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The system replaces complex mechanical phase matching mechanisms with electronic phase angle sensing and computational control. Sensors measure phase angles electronically, and a controller algorithm determines the optimal switching configuration, simplifying the overall system while achieving precise phase angle matching to minimize electrical disruptions.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The system performs self-diagnosis and self-adjustment by automatically sensing phase angles, calculating the optimal configuration, and executing the switching sequence without external intervention. This autonomous operation reduces the need for complex external control systems while minimizing electrical disruptions through intelligent phase angle matching.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS12212229B2Static transfer switch with controlled phase angle transfer

Publication Date: 2025.01.28 ABB (SCHWEIZ) AG

AI summary

A static transfer switch is provided for supplying power to a load alternately from two different power sources. Preferably, switching between the two power sources occurs within one electrical cycle. In order to control inrush currents and reduce disruption during power transfers between the two power sources, switches are provided to configure which input phases are connected to the output phases.