Transfer Switch Neutral Pole Overlap for Voltage Stability
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Solution Overview
Problem
Existing transfer switching equipment causes temporary disconnection of the neutral pole during power supply switching, leading to voltage fluctuations and potential damage to electrical equipment, and has a complex structure that occupies large space.
Innovation Solution
The transfer switching equipment employs a first and second switch set with locking mechanisms and linkage members to ensure simultaneous closure of neutral poles and opening of phase poles during switching, using drive mechanisms and linkage members to coordinate the switching sequence, thereby maintaining continuous voltage and reducing equipment complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the neutral pole and phase pole are opened and closed completely simultaneously during switching, then the switching operation is simple, but the neutral pole of the UPS is temporarily disconnected causing voltage fluctuations and potential damage to electrical equipment
Solution Approach 1:
The switching operation is segmented into distinct phases: first closing the neutral pole, then closing the phase pole, and finally opening the neutral pole after the phase pole is closed. This segmentation prevents temporary disconnection of the UPS neutral pole by ensuring overlapping closure periods, thereby maintaining continuous power supply while keeping the switching operation manageable through clear sequential steps.
Solution Approach 2:
The neutral pole is closed preliminarily before the phase pole is closed. This preliminary action ensures that the neutral connection is established in advance, preventing any temporary disconnection of the UPS neutral pole during the switching process and maintaining voltage stability throughout the operation.
2Reliability
If there is a period of overlapping time in which the neutral pole of the mains supply and the neutral pole of the generator are closed at the same time, then continuous power supply is maintained, but a phase pole of one power supply and the neutral pole of another power supply are closed at the same time causing voltage burrs on the load
Solution Approach 1:
The switching process is segmented into distinct sequential steps that prevent harmful overlapping conditions. The neutral pole closing is separated from the phase pole closing in time, ensuring that when the neutral poles overlap, the phase poles are already closed or opening, thereby avoiding the harmful condition of phase pole and neutral pole from different supplies being closed simultaneously while maintaining continuous power supply.
3Manufacturing precision
If the transfer switching equipment uses a complex structure to achieve precise switching control, then switching accuracy is improved, but the product size becomes very large and installation becomes difficult
Solution Approach 1:
The control mechanisms for the neutral pole and phase pole are merged into a unified switching device with integrated drive mechanisms. This merging allows precise control of the switching sequence through a single coordinated system rather than separate complex control systems, achieving high switching accuracy while reducing overall device complexity and size for easier installation.
Data Source
AI summary
The present disclosure provides a transfer switching equipment, comprising a first switch set and a second switch set. The transfer switching equipment is configured in a way that during the switching from a closed state of one of the first switch set and the second switch set to a closed state of the other of the first switch set and the second switch set, there is a state in which the neutral poles of the first switch set and the neutral pole of the second switch set are closed at the same time while all phase poles of the first switch set and all phase poles of the second switch set are all opened. The transfer switching equipment has a simple and reliable structure and occupies a small space and can provide continuous voltage with high-quality during switching the power supply.