Permanent Magnet Double Power Supply Change-Over Switch
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Solution Overview
Problem
Current medium voltage double power supply change-over switches have large volumes and low interlocking reliability, failing to meet modern market demands for a compact and reliable solution with integrated mechanical and electrical interlocking.
Innovation Solution
A medium voltage double power supply change-over switch with a permanent magnet design, incorporating A and B power supply components, a body frame, charging capacitor, chassis, and various mechanisms for reliable electromechanical interlocking, including a chassis closing and locking mechanism, manual emergency breaking, and hydraulic buffer systems, to ensure small size and high reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two medium voltage circuit breakers are used to compose the change-over switch, then the electrical interlocking function is achieved, but the volume becomes huge and the structure is complex
Solution Approach 1:
The patent combines two circuit breaker functions into a single integrated change-over switch body, merging the A power supply circuit breaker and B power supply circuit breaker into one unified structure. This integration reduces the overall volume while maintaining the electrical interlocking function through shared mechanical and electrical components within the single switch body.
Solution Approach 2:
The single change-over switch body performs multiple functions: it serves as both the A power supply circuit breaker and B power supply circuit breaker, while also providing the change-over function. The switch body universally handles power supply switching, circuit breaking, and interlocking operations, eliminating the need for separate dedicated components for each function.
2Reliability
If two medium voltage circuit breakers are used to compose the change-over switch, then the electrical interlocking function is achieved, but the device complexity increases
Solution Approach 1:
The patent merges the structural components of two separate circuit breakers into a single integrated change-over switch body. The operating mechanism, arc extinguishing chambers, and interlocking components are combined into one unified structure, significantly reducing device complexity while maintaining reliable electrical interlocking functionality.
Solution Approach 2:
The patent employs a nested structure where the B power supply circuit breaker components are integrated within the same switch body as the A power supply circuit breaker. The mechanical and electrical components are arranged in a compact nested configuration, reducing overall complexity while preserving all necessary interlocking functions.
3Ease of operation
If traditional interlocking mechanisms are used, then the basic interlocking function is provided, but the interlocking reliability is low
Solution Approach 1:
The patent replaces traditional purely mechanical interlocking mechanisms with an integrated electromechanical system. The change-over switch body incorporates both mechanical interlocking components and electrical interlocking circuits that work together, providing enhanced reliability through redundant interlocking paths and more precise control compared to traditional mechanical-only systems.
Solution Approach 2:
The patent implements feedback mechanisms within the interlocking system, where the state of one circuit breaker is electrically sensed and automatically influences the operation of the other through the integrated control circuits. This feedback ensures that interlocking actions are reliably executed and provides automatic verification of the interlocked state, enhancing overall reliability.
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 solution provides a compact, reliable, and efficient medium voltage double power supply change-over switch with stable performance and long mechanical life, enhancing installation and maintenance convenience through integrated electromechanical design and permanent magnet-driven mechanisms.
Implementation Method 1
A power supply permanent magnet driving mechanism (3), a B power supply permanent magnet driving mechanism (11)
Implementation Method 2
A power supply closing hydraulic buffer mechanism (48), a B power supply closing hydraulic buffer mechanism (51)
Data Source
AI summary
The invention relates to a medium voltage double power supply change-over switch using a permanent magnet mechanism. The invention is provided with a spring as the breaking force and closing buffer, a chassis and a plum blossom contact structure, a manual emergency breaking and manual closing function. Further, the invention is provided with an in-out auxiliary mechanism of a movable contact, a chassis closing and locking mechanism, and a hydraulic buffer mechanism. Advantages of the present invention include simple structure, stable performance, and long mechanical life. The pull-out structure is used, greatly improving the convenience of installation and maintenance. The capacitor is used as a permanent magnet drive power supply, completing the switching between the two medium voltage power supplies. The invention realizes comprehensive operation functions of the change-over switch, such as automatic operation switching, electrical operation switching, and manual switching.