Integrated Switchgear Enclosure for Compact MV Transformer Protection
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Solution Overview
Problem
The compactness of electrical switchgear in wind and photovoltaic power generation installations is limited by metallic enclosures, leading to restricted space for installation, increased complexity, and higher risks of errors and accidents, as well as prolonged energy loss due to disconnection of entire generation lines during maintenance and fault repairs in radial electrical diagrams.
Innovation Solution
The integration of riser, line, and protection units within a single, dielectrically insulated metal enclosure with upper and lower cable connection points and switching devices, allowing for connecting, breaking, disconnecting, and grounding functions, reduces the need for multiple enclosures and minimizes cable length, enhancing installation ease and safety while enabling remote operation and energy measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multiple separate metallic enclosures are used for riser, line, and protection units, then each unit can be independently installed and maintained, but the installation space requirement increases and the complexity of installation increases
Solution Approach 1:
The patent combines multiple separate metallic enclosures (riser unit, line unit, protection unit) into a single integrated metallic enclosure. This merging reduces the total installation space required while maintaining the functional independence of each unit through internal separation structures and modular design elements that allow independent access and maintenance.
2Ease of manufacture
If multiple separate metallic enclosures are used for riser, line, and protection units, then each unit can be independently installed and maintained, but the risk of installation errors and accidents increases
Solution Approach 1:
The integration of multiple units into a single enclosed space reduces the number of connection points and interfaces between separate enclosures, thereby reducing potential sources of installation errors. The unified structure provides better protection against accidental contact with live parts and improves overall installation safety.
3Device complexity
If radial electrical diagram configuration is used, then the electrical connection structure is simplified, but the energy loss increases during maintenance and fault repairs
Solution Approach 1:
The patent implements internal segmentation within the unified metallic enclosure, creating distinct compartments for riser, line, and protection units. This segmentation allows independent access and maintenance of each unit without requiring disconnection of the entire generation line, thereby reducing energy loss while maintaining the simplicity of the radial electrical diagram configuration.
4Area of stationary object
If compact enclosure design is used, then the installation space is reduced, but the freedom of movement for installation personnel is restricted
Solution Approach 1:
The patent employs a nested design where multiple functional units (riser, line, protection units) are arranged in a compact, space-efficient configuration within the single metallic enclosure. Strategic placement of access points and operational interfaces on the exterior allows personnel to perform installation and maintenance operations without requiring extensive movement within the enclosure, thus maintaining ease of operation despite reduced space.
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 configuration simplifies installation, reduces the risk of accidents, and minimizes energy loss by allowing for efficient maintenance and fault isolation, with reduced cable costs and improved operational flexibility in constrained spaces.
Implementation Method 1
an enclosure (8), for example metallic, insulated in a dielectric fluid
Data Source
Figure 1~2
Figure 3
Figure 4a~4c
AI summary
Electrical switchgear (1) for electrical power generation installations, specifically the type that allows interconnection to the electrical power distribution network and is also capable of carrying out functions for protecting LV/MV transformer and connecting to medium voltage cables of the installations that comprises an enclosure (8) that incorporates insulated in a dielectric fluid a riser unit (2) and a protection unit (3) with at least one switching device (6, 7, 20 ) with connecting, breaking, disconnecting and grounding functions, and a line unit (9) that in turn comprises a switching device (11) with connecting, breaking, disconnecting and grounding functions.