Gas Insulated Switchgear Flexible Arrangement
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Solution Overview
Problem
Conventional gas insulated switching devices face limitations in device arrangement due to the specifications of measuring instruments like current and voltage transformers, and the direction of power cable connection, leading to restricted space and increased height.
Innovation Solution
The design incorporates a pressure vessel with a step part and an outside step cavity, allowing the current transformer to be placed outside and connected via a bushing, enabling flexible arrangement independent of transformer specifications and cable connection direction, with the bus bar and circuit breaker connected through the disconnecting switch within the pressure vessel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the current transformer is housed inside the pressure vessel, then the electrical insulation is maintained, but the storage range for the transformer is limited and the device arrangement becomes rigid
Solution Approach 1:
The patent divides the housing into two distinct spaces: the pressure vessel containing switching devices and the cable chamber for housing the current transformer. This segmentation allows each component to be optimally positioned according to its functional requirements, enabling flexible device arrangement without compromising electrical insulation.
Solution Approach 2:
The patent introduces a bushing as an intermediary component that penetrates the housing wall to connect the primary conductor from the cable chamber to the switching devices in the pressure vessel. This intermediary structure enables the current transformer to be housed outside the pressure vessel while maintaining electrical connection, thus expanding the storage range and improving adaptability.
2Ease of manufacture
If the voltage transformer is placed on top of the bus bar, then the connection is simplified, but the overall height of the housing increases
Solution Approach 1:
The patent relocates the voltage transformer from a vertical position on top of the bus bar to a horizontal position within the cable chamber. This dimensional change in spatial arrangement maintains the electrical connection simplicity while significantly reducing the overall height of the housing, allowing for more compact installations.
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 results in a compact, flexible gas insulated switching device that can accommodate various transformer specifications and cable connection directions without increasing the overall height, enhancing the installation space and adaptability.
Implementation Method 1
by sealing the insulating gas at a predetermined pressure in the pressure vessel in the housing, the parts between live part and grounding part, and the interphase of live parts are insulated
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
The pressure vessel 1 is disposed between the operation mechanism 14 of the circuit breaker 3 and the power cable 9, a step part 1s is provided at the corner of the pressure vessel 1 on the power cable 9 side, an outside step cavity 1hua is formed outside the stepped part 1s and inside the housing 100, a current transformer 5 for each of the three phases is arranged in the outside step cavity 1hua, through the power cable connecting bushing 7 that penetrates the wall part of the housing 100 interposed between the outside step cavity 1hua and the power cable 9, by connecting the primary conductor of the current transformer 5 and the power cable 9, it is possible to realize a gas insulated switching device with a small and flexible device arrangement that does not depend on the specifications of a measuring device such as a current transformer or a voltage transformer and the cable connection direction.