Motorized Drive Replicating Device for Switchgear Racking
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Solution Overview
Problem
Existing motorized drives for insertion and extraction operations in medium voltage switchgear lack reliability and flexibility, often resulting in premature interruption of racking operations due to reliance on motor parameters rather than actual truck position, and are not adaptable to various switchgear configurations.
Innovation Solution
A motorized drive system with a replicating device that directly connects to the main drive shaft, allowing for precise replication of the truck's stroke and using adjustable end-stroke means, such as microswitches, to ensure accurate switching-off at desired positions, thereby ensuring the drive motor is only stopped when the truck reaches the final intended position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If motor parameters (torque, current) are monitored to identify the stopping point, then the drive motor can be switched-off automatically, but the system becomes more complicated and expensive, and the switching-off is not based on the real position of the truck
Solution Approach 1:
The patent uses a replicating device that creates a mechanical copy of the truck's movement. The replicating device includes a movable actuator that replicates the truck's stroke through a mechanical linkage connected to the main drive shaft. This mechanical copy provides direct position feedback without complex electronic monitoring systems.
Solution Approach 2:
The patent replaces electronic/motor parameter monitoring systems with a mechanical replication system. The replicating device uses mechanical components (actuator, linkage, microswitches) to detect position and control the drive motor, substituting complex electrical monitoring with a simpler mechanical feedback mechanism.
2Adaptability or versatility
If a dedicated system is designed for each specific switchgear/circuit breaker couple, then the system can be precisely adapted to specific operating parameters, but the device complexity and cost increase significantly
Solution Approach 1:
The patent designs a universal motorized drive system with a replicating device that can adapt to different switchgear and circuit breaker configurations. The system uses adjustable end-stroke means and programmable microswitches that can be configured for various operating strokes and positions, allowing one system design to serve multiple applications without requiring dedicated custom systems for each couple.
Solution Approach 2:
The patent incorporates dynamic and adjustable elements in the replicating device, including adjustable end-stroke means and reconfigurable microswitch positions. This allows the system to adapt its mechanical configuration to match different operating parameters of various switchgear/circuit breaker couples, providing versatility without requiring completely different dedicated systems.
3Productivity
If the drive motor is switched-off based on motor parameters, then the operation can be automated, but the truck may be stopped before completion due to obstacles or mechanical failures, creating safety risks
Solution Approach 1:
The patent implements a feedback mechanism where the replicating device continuously monitors the actual position of the truck through its movable actuator and mechanical linkage. Microswitches positioned at predetermined locations provide feedback signals to confirm the truck has reached the intended final position, ensuring the drive motor is switched-off only when the operation is truly complete, not just when motor parameters suggest it should stop.
Data Source
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AI summary
A motorized drive (1) for racking operations in a medium voltage switchgear comprising a main drive shaft (2) actuated by a drive motor (3) and adapted to be operatively coupled to a truck in said medium voltage switchgear characterized in that it comprises a replicating device (10) which replicates the stroke of said truck during rack-in or rack out operations in said switchgear.