Standardized Drive for Gas-Insulated Switchgear Pole Distance Adaptation
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Solution Overview
Problem
Existing medium voltage vacuum circuit breakers face challenges due to high variance in pole distances, leading to a large number of parts and subassemblies, long production times, high costs, and difficulty in outsourcing, as each rating requires a unique design with non-interchangeable parts.
Innovation Solution
A standardized circuit breaker drive adaptable to different pole distances through a plate or frame with gastight mechanical feedthroughs, allowing independent mounting and maintenance outside the gastight compartment, and modular components such as a spring drive, curve discs, and levers that can be easily adapted to various pole distances by exchanging coupling shafts and modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different pole distances are used for different switchgear ratings, then the circuit breaker can be adapted to various switchgear configurations, but the number of parts and subassemblies increases significantly
Solution Approach 1:
The drive mechanism is designed with a universal configuration that can serve multiple pole distance requirements. The drive unit itself remains standardized while only the coupling elements (pushrods) need to be changed to adapt to different pole distances, allowing one drive design to fulfill multiple functions across different switchgear ratings.
Solution Approach 2:
The circuit breaker is divided into modular components: a standardized drive unit, interchangeable coupling elements (pushrods), and a common plate or frame. This segmentation allows the drive mechanism to be separated from the pole-specific components, enabling the drive to be reused across different configurations while only replacing the necessary coupling elements.
2Adaptability or versatility
If each rating requires a unique drive design, then the circuit breaker can be optimized for specific pole distances, but the production time and costs increase
Solution Approach 1:
The drive mechanism is pre-configured with standardized components and mounting provisions that anticipate future assembly needs. The common plate or frame is pre-designed with appropriate mounting locations for different pole distances, allowing rapid assembly by simply selecting and installing the correct coupling elements without requiring custom drive design for each rating.
Solution Approach 2:
Instead of changing the entire drive design for different ratings, only specific parameters (the coupling element dimensions and pushrod lengths) are changed while maintaining the core drive mechanism unchanged. This allows optimization for specific pole distances through parameter adjustment rather than complete redesign.
3Adaptability or versatility
If each rating requires a unique drive design, then the circuit breaker can be optimized for specific pole distances, but the production costs increase
Solution Approach 1:
The drive mechanism is designed with a universal configuration that can serve multiple pole distance requirements. The drive unit itself remains standardized while only the coupling elements (pushrods) need to be changed to adapt to different pole distances, allowing one drive design to fulfill multiple functions across different switchgear ratings.
Solution Approach 2:
Instead of changing the entire drive design for different ratings, only specific parameters (the coupling element dimensions and pushrod lengths) are changed while maintaining the core drive mechanism unchanged. This allows optimization for specific pole distances through parameter adjustment rather than complete redesign.
4Reliability
If the drive is fixed inside the gastight compartment, then the sealing can be simplified, but the maintenance and servicing become difficult
Solution Approach 1:
The drive mechanism is extracted from the gastight compartment and mounted on the exterior of the common plate or frame. This separation allows the drive to be serviced, maintained, and replaced without compromising the sealing integrity of the gastight compartment, as the drive is accessible from outside while the compartment remains sealed.
Solution Approach 2:
The common plate or frame serves as an intermediary structure that couples the externally mounted drive with the internally located pole parts through gastight mechanical feedthroughs. This intermediary allows mechanical force transmission while maintaining the seal boundary between the drive (outside) and the gastight compartment (inside).
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a gas-insulated medium voltage switchgear with a circuit breaker pole part arrangement in a gastight compartment of the switchgear, and with a drive arrangement for switching actuation of the circuit breaker, wherein the drive as well as the pole part arrangement is fixed on a common plate or frame, which is provided with a gastight sealing, and is closing the aforesaid compartment gastightly in such, that in the completely mounted position of the plate or frame, the pole parts are positioned inside, and the drive is positioned outside the aforesaid gastight compartment, according to the preamble of claim 1. In order to overcome constructural disadvantages, which may coincidently lead to further advantages in a method of assembling such a medium voltage vacuum circuit breaker for gas-insulated switchgear, the in invention is, that a standarized circuit breaker drive (8) is adaptable to switchgear arrangements with different pole distances (x, y), and that the plate or frame (2) is provided with holes, in which gastight mechanical feedtroughs (3) are arranged in, through which the drive (8) is coupled with each of the vacuum interrupters in the pole parts (1), and that by predefinable positioning of the holes, the plate or frame (2) can easily be adapted to the pole distance (x, y) in the gastight compartment.