Pressurized Gas Switchgear With Single-Module Arc Breaking
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Solution Overview
Problem
Current electrical switchgear systems are bulky, costly, and environmentally impactful due to the use of SF6 gas and require multiple modules for different functions, leading to increased size and manufacturing time, along with issues like thermal stress and partial discharges in solid insulation solutions.
Innovation Solution
A compact electrical switchgear design using a single operating means within a gas-insulated enclosure with a cylindrical geometry, employing a gas such as air or CO2 at higher than atmospheric pressure, and a second joining mechanism with rounded pieces for efficient phase insulation and reduced size, eliminating the need for multiple modules and reducing environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SF6 gas is used for insulation, then dielectric properties are improved, but environmental impact worsens
Solution Approach 1:
The patent changes the physical parameters of the insulating gas by using gases at pressures higher than atmospheric pressure (above 1 atm). This parameter change allows alternative gases like air, CO2, or nitrogen to achieve dielectric properties comparable to SF6, thereby maintaining reliability while reducing environmental harm.
Solution Approach 2:
The patent replaces expensive and environmentally harmful SF6 gas with cheaper, environmentally friendly alternative gases such as air, CO2, or nitrogen. These alternatives have lower environmental impact and cost, making them economically and ecologically advantageous despite requiring higher pressure operation.
2Adaptability or versatility
If multiple modules are used for different functions, then functional versatility is improved, but device size worsens
Solution Approach 1:
The patent merges multiple functional modules (breaking function, making function, disconnecting function, and grounding function) into a single integrated switchgear assembly. All four operating means are housed within one gas-insulated enclosure, eliminating the need for separate modules and significantly reducing overall device size while maintaining full functional versatility.
Solution Approach 2:
The patent creates a universal switchgear assembly that performs multiple functions (breaking, making, disconnecting, and grounding) within a single device. This multi-functional design allows the same enclosure to handle various electrical operations, improving versatility without requiring additional specialized modules.
3Length of stationary object
If solid insulation is used, then insulation distance is reduced, but thermal stress and partial discharges worsen
Solution Approach 1:
The patent uses pressurized gas (pneumatic approach) as the insulating medium instead of solid insulation. By maintaining gas pressure above atmospheric levels, the system achieves effective insulation with reduced distances while avoiding the thermal stress and partial discharge problems associated with solid insulating materials.
4Ease of manufacture
If cylindrical geometry with rounded pieces is used, then manufacturing efficiency is improved, but structural complexity worsens
Solution Approach 1:
The patent employs cylindrical geometry with rounded pieces (ball joints) for the joining mechanisms. This curved geometry simplifies manufacturing processes compared to sharp-edged or complex angular structures, while the standardized cylindrical and spherical forms actually reduce structural complexity through geometric simplicity and ease of fabrication.
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 results in a more compact, cost-effective, and environmentally friendly electrical switchgear system with reduced insulation distances and thermal-dynamic resistance, enabling efficient arc extinction and simplified assembly, while minimizing the use of environmentally harmful gases.
Implementation Method 1
a first enclosure (1), which may be sealed, shielded and grounded, and insulated in a gas with a relative pressure, that is, higher than atmospheric pressure
Implementation Method 2
the same insulating gas contained in the first enclosure (1) also allows the extinction of the electric arc generated between the contacts of the operating means
Implementation Method 3
a second joining mechanism with rounded pieces for efficient phase insulation
Data Source
AI summary
Gas-insulated electrical switchgear for medium and high-voltage electrical distribution networks that allows configuring different electrical diagrams and that basically consists of a first gas-insulated enclosure (1) and is equipped with at least one electrical connection means (2, 3) and at least one mechanical connection means (4), a second enclosure (11) housed inside the first enclosure (1) and an operating means (5) integrated inside a second enclosure (11) which in turn comprises a gas breaking switch, an actuating element (8) configured to actuate the operating means (5) that performs the functions of breaking, making, disconnecting and grounding, and an operating mechanism (9) to produce actuation of the actuating element (8).