Kinematic Linkage Arrangement for Switching Device Time Delay
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Solution Overview
Problem
In wind power generation systems, grounding transformers often fail to detect faults, leading to uncontrolled voltage increases and high operational costs due to the lack of timely isolation and grounding, as wind turbines continue to energize isolated collector cables.
Innovation Solution
A switching device with a kinematic linkage arrangement that integrates circuit breaking and grounding functions, featuring a lever member, elastic member, and cam member, which maintains a time delay between the operation of circuit breaker and grounding switch to ensure safe and controlled voltage discharge, allowing for a 12-16 millisecond delay to prevent voltage spikes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a combined circuit breaker and grounding switch is used to eliminate the grounding transformer, then device complexity is reduced, but a time delay is required between circuit breaker opening and grounding switch closing to allow voltage discharge and arc quenching
Solution Approach 1:
The patent employs a dynamic kinematic linkage mechanism with a cam member that rotates during the switching operation. The cam member's profile is designed to automatically control the timing sequence, providing the required time delay between circuit breaker opening and grounding switch closing through its rotational motion, thereby eliminating the need for complex electronic timing controls while maintaining the necessary operational sequence
Solution Approach 2:
The patent introduces an intermediary elastic member (spring) that couples the cam member to the grounding switch actuator. This elastic intermediary stores energy during the circuit breaker opening phase and releases it to trigger the grounding switch closing after the required delay, mediating the timing relationship between the two switching operations without requiring direct mechanical coupling or complex control systems
2Loss of time
If the stroke of the grounding switch is adjusted to provide time delay, then the time delay function is achieved, but the mechanical design complexity increases
Solution Approach 1:
The patent changes the geometric parameters of the cam member profile to control the timing sequence. By adjusting the cam's radius, eccentricity, and contour shape, the desired time delay is achieved through the rotational kinematics of the cam rather than through complex mechanical linkages or adjustable stroke mechanisms, simplifying the overall mechanical design while maintaining precise timing control
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 effectively reduces operational costs by ensuring controlled voltage discharge and arc quenching, maintaining mechanical design simplicity without increasing costs, and improving fault detection in wind power generation systems.
Implementation Method 1
The kinematic linkage arrangement includes an elastic member. The elastic member and the cam member are configured to provide a predetermined torque to the drive unit for maintaining the first interrupter unit in an open state
Implementation Method 2
The cam member is rigidly connected to the drive unit shaft of the drive unit. The elastic member is adjustably connected to the cam member
Data Source
AI summary
A switching device having a pole assembly, a drive unit, and a kinematic linkage arrangement is provided. The pole assembly includes interrupter units operably connected via an interlink arrangement representing a circuit breaker and a grounding switch, respectively. The drive unit operates the interrupter units. The kinematic linkage arrangement includes at least a lever member operably connected to the interlink arrangement and the drive unit, a cam member rigidly connected to the drive unit, and an elastic member adjustably connected to the cam member. The kinematic linkage arrangement transfer a predefined torque to the drive unit to maintain the circuit breaker in an open state.